Commit | Line | Data |
---|---|---|
1da177e4 LT |
1 | /* |
2 | * This file is subject to the terms and conditions of the GNU General Public | |
3 | * License. See the file "COPYING" in the main directory of this archive | |
4 | * for more details. | |
5 | * | |
6 | * Copyright (C) 2003-2005 Silicon Graphics, Inc. All Rights Reserved. | |
7 | */ | |
8 | ||
9 | ||
10 | /* | |
11 | * This file contains a module version of the ioc4 serial driver. This | |
12 | * includes all the support functions needed (support functions, etc.) | |
13 | * and the serial driver itself. | |
14 | */ | |
15 | #include <linux/errno.h> | |
16 | #include <linux/tty.h> | |
17 | #include <linux/serial.h> | |
18 | #include <linux/serialP.h> | |
19 | #include <linux/circ_buf.h> | |
20 | #include <linux/serial_reg.h> | |
21 | #include <linux/module.h> | |
22 | #include <linux/pci.h> | |
22329b51 | 23 | #include <linux/ioc4.h> |
1da177e4 LT |
24 | #include <linux/serial_core.h> |
25 | ||
26 | /* | |
27 | * interesting things about the ioc4 | |
28 | */ | |
29 | ||
30 | #define IOC4_NUM_SERIAL_PORTS 4 /* max ports per card */ | |
31 | #define IOC4_NUM_CARDS 8 /* max cards per partition */ | |
32 | ||
33 | #define GET_SIO_IR(_n) (_n == 0) ? (IOC4_SIO_IR_S0) : \ | |
34 | (_n == 1) ? (IOC4_SIO_IR_S1) : \ | |
35 | (_n == 2) ? (IOC4_SIO_IR_S2) : \ | |
36 | (IOC4_SIO_IR_S3) | |
37 | ||
38 | #define GET_OTHER_IR(_n) (_n == 0) ? (IOC4_OTHER_IR_S0_MEMERR) : \ | |
39 | (_n == 1) ? (IOC4_OTHER_IR_S1_MEMERR) : \ | |
40 | (_n == 2) ? (IOC4_OTHER_IR_S2_MEMERR) : \ | |
41 | (IOC4_OTHER_IR_S3_MEMERR) | |
42 | ||
43 | ||
44 | /* | |
45 | * All IOC4 registers are 32 bits wide. | |
46 | */ | |
47 | ||
48 | /* | |
49 | * PCI Memory Space Map | |
50 | */ | |
51 | #define IOC4_PCI_ERR_ADDR_L 0x000 /* Low Error Address */ | |
52 | #define IOC4_PCI_ERR_ADDR_VLD (0x1 << 0) | |
53 | #define IOC4_PCI_ERR_ADDR_MST_ID_MSK (0xf << 1) | |
54 | #define IOC4_PCI_ERR_ADDR_MST_NUM_MSK (0xe << 1) | |
55 | #define IOC4_PCI_ERR_ADDR_MST_TYP_MSK (0x1 << 1) | |
56 | #define IOC4_PCI_ERR_ADDR_MUL_ERR (0x1 << 5) | |
57 | #define IOC4_PCI_ERR_ADDR_ADDR_MSK (0x3ffffff << 6) | |
58 | ||
59 | /* Interrupt types */ | |
60 | #define IOC4_SIO_INTR_TYPE 0 | |
61 | #define IOC4_OTHER_INTR_TYPE 1 | |
62 | #define IOC4_NUM_INTR_TYPES 2 | |
63 | ||
64 | /* Bitmasks for IOC4_SIO_IR, IOC4_SIO_IEC, and IOC4_SIO_IES */ | |
65 | #define IOC4_SIO_IR_S0_TX_MT 0x00000001 /* Serial port 0 TX empty */ | |
66 | #define IOC4_SIO_IR_S0_RX_FULL 0x00000002 /* Port 0 RX buf full */ | |
67 | #define IOC4_SIO_IR_S0_RX_HIGH 0x00000004 /* Port 0 RX hiwat */ | |
68 | #define IOC4_SIO_IR_S0_RX_TIMER 0x00000008 /* Port 0 RX timeout */ | |
69 | #define IOC4_SIO_IR_S0_DELTA_DCD 0x00000010 /* Port 0 delta DCD */ | |
70 | #define IOC4_SIO_IR_S0_DELTA_CTS 0x00000020 /* Port 0 delta CTS */ | |
71 | #define IOC4_SIO_IR_S0_INT 0x00000040 /* Port 0 pass-thru intr */ | |
72 | #define IOC4_SIO_IR_S0_TX_EXPLICIT 0x00000080 /* Port 0 explicit TX thru */ | |
73 | #define IOC4_SIO_IR_S1_TX_MT 0x00000100 /* Serial port 1 */ | |
74 | #define IOC4_SIO_IR_S1_RX_FULL 0x00000200 /* */ | |
75 | #define IOC4_SIO_IR_S1_RX_HIGH 0x00000400 /* */ | |
76 | #define IOC4_SIO_IR_S1_RX_TIMER 0x00000800 /* */ | |
77 | #define IOC4_SIO_IR_S1_DELTA_DCD 0x00001000 /* */ | |
78 | #define IOC4_SIO_IR_S1_DELTA_CTS 0x00002000 /* */ | |
79 | #define IOC4_SIO_IR_S1_INT 0x00004000 /* */ | |
80 | #define IOC4_SIO_IR_S1_TX_EXPLICIT 0x00008000 /* */ | |
81 | #define IOC4_SIO_IR_S2_TX_MT 0x00010000 /* Serial port 2 */ | |
82 | #define IOC4_SIO_IR_S2_RX_FULL 0x00020000 /* */ | |
83 | #define IOC4_SIO_IR_S2_RX_HIGH 0x00040000 /* */ | |
84 | #define IOC4_SIO_IR_S2_RX_TIMER 0x00080000 /* */ | |
85 | #define IOC4_SIO_IR_S2_DELTA_DCD 0x00100000 /* */ | |
86 | #define IOC4_SIO_IR_S2_DELTA_CTS 0x00200000 /* */ | |
87 | #define IOC4_SIO_IR_S2_INT 0x00400000 /* */ | |
88 | #define IOC4_SIO_IR_S2_TX_EXPLICIT 0x00800000 /* */ | |
89 | #define IOC4_SIO_IR_S3_TX_MT 0x01000000 /* Serial port 3 */ | |
90 | #define IOC4_SIO_IR_S3_RX_FULL 0x02000000 /* */ | |
91 | #define IOC4_SIO_IR_S3_RX_HIGH 0x04000000 /* */ | |
92 | #define IOC4_SIO_IR_S3_RX_TIMER 0x08000000 /* */ | |
93 | #define IOC4_SIO_IR_S3_DELTA_DCD 0x10000000 /* */ | |
94 | #define IOC4_SIO_IR_S3_DELTA_CTS 0x20000000 /* */ | |
95 | #define IOC4_SIO_IR_S3_INT 0x40000000 /* */ | |
96 | #define IOC4_SIO_IR_S3_TX_EXPLICIT 0x80000000 /* */ | |
97 | ||
98 | /* Per device interrupt masks */ | |
99 | #define IOC4_SIO_IR_S0 (IOC4_SIO_IR_S0_TX_MT | \ | |
100 | IOC4_SIO_IR_S0_RX_FULL | \ | |
101 | IOC4_SIO_IR_S0_RX_HIGH | \ | |
102 | IOC4_SIO_IR_S0_RX_TIMER | \ | |
103 | IOC4_SIO_IR_S0_DELTA_DCD | \ | |
104 | IOC4_SIO_IR_S0_DELTA_CTS | \ | |
105 | IOC4_SIO_IR_S0_INT | \ | |
106 | IOC4_SIO_IR_S0_TX_EXPLICIT) | |
107 | #define IOC4_SIO_IR_S1 (IOC4_SIO_IR_S1_TX_MT | \ | |
108 | IOC4_SIO_IR_S1_RX_FULL | \ | |
109 | IOC4_SIO_IR_S1_RX_HIGH | \ | |
110 | IOC4_SIO_IR_S1_RX_TIMER | \ | |
111 | IOC4_SIO_IR_S1_DELTA_DCD | \ | |
112 | IOC4_SIO_IR_S1_DELTA_CTS | \ | |
113 | IOC4_SIO_IR_S1_INT | \ | |
114 | IOC4_SIO_IR_S1_TX_EXPLICIT) | |
115 | #define IOC4_SIO_IR_S2 (IOC4_SIO_IR_S2_TX_MT | \ | |
116 | IOC4_SIO_IR_S2_RX_FULL | \ | |
117 | IOC4_SIO_IR_S2_RX_HIGH | \ | |
118 | IOC4_SIO_IR_S2_RX_TIMER | \ | |
119 | IOC4_SIO_IR_S2_DELTA_DCD | \ | |
120 | IOC4_SIO_IR_S2_DELTA_CTS | \ | |
121 | IOC4_SIO_IR_S2_INT | \ | |
122 | IOC4_SIO_IR_S2_TX_EXPLICIT) | |
123 | #define IOC4_SIO_IR_S3 (IOC4_SIO_IR_S3_TX_MT | \ | |
124 | IOC4_SIO_IR_S3_RX_FULL | \ | |
125 | IOC4_SIO_IR_S3_RX_HIGH | \ | |
126 | IOC4_SIO_IR_S3_RX_TIMER | \ | |
127 | IOC4_SIO_IR_S3_DELTA_DCD | \ | |
128 | IOC4_SIO_IR_S3_DELTA_CTS | \ | |
129 | IOC4_SIO_IR_S3_INT | \ | |
130 | IOC4_SIO_IR_S3_TX_EXPLICIT) | |
131 | ||
132 | /* Bitmasks for IOC4_OTHER_IR, IOC4_OTHER_IEC, and IOC4_OTHER_IES */ | |
22329b51 BC |
133 | #define IOC4_OTHER_IR_ATA_INT 0x00000001 /* ATAPI intr pass-thru */ |
134 | #define IOC4_OTHER_IR_ATA_MEMERR 0x00000002 /* ATAPI DMA PCI error */ | |
135 | #define IOC4_OTHER_IR_S0_MEMERR 0x00000004 /* Port 0 PCI error */ | |
136 | #define IOC4_OTHER_IR_S1_MEMERR 0x00000008 /* Port 1 PCI error */ | |
137 | #define IOC4_OTHER_IR_S2_MEMERR 0x00000010 /* Port 2 PCI error */ | |
138 | #define IOC4_OTHER_IR_S3_MEMERR 0x00000020 /* Port 3 PCI error */ | |
139 | #define IOC4_OTHER_IR_KBD_INT 0x00000040 /* Keyboard/mouse */ | |
140 | #define IOC4_OTHER_IR_RESERVED 0x007fff80 /* Reserved */ | |
141 | #define IOC4_OTHER_IR_RT_INT 0x00800000 /* INT_OUT section output */ | |
142 | #define IOC4_OTHER_IR_GEN_INT 0xff000000 /* Generic pins */ | |
143 | ||
144 | #define IOC4_OTHER_IR_SER_MEMERR (IOC4_OTHER_IR_S0_MEMERR | IOC4_OTHER_IR_S1_MEMERR | \ | |
145 | IOC4_OTHER_IR_S2_MEMERR | IOC4_OTHER_IR_S3_MEMERR) | |
1da177e4 LT |
146 | |
147 | /* Bitmasks for IOC4_SIO_CR */ | |
148 | #define IOC4_SIO_CR_CMD_PULSE_SHIFT 0 /* byte bus strobe shift */ | |
149 | #define IOC4_SIO_CR_ARB_DIAG_TX0 0x00000000 | |
150 | #define IOC4_SIO_CR_ARB_DIAG_RX0 0x00000010 | |
151 | #define IOC4_SIO_CR_ARB_DIAG_TX1 0x00000020 | |
152 | #define IOC4_SIO_CR_ARB_DIAG_RX1 0x00000030 | |
153 | #define IOC4_SIO_CR_ARB_DIAG_TX2 0x00000040 | |
154 | #define IOC4_SIO_CR_ARB_DIAG_RX2 0x00000050 | |
155 | #define IOC4_SIO_CR_ARB_DIAG_TX3 0x00000060 | |
156 | #define IOC4_SIO_CR_ARB_DIAG_RX3 0x00000070 | |
157 | #define IOC4_SIO_CR_SIO_DIAG_IDLE 0x00000080 /* 0 -> active request among | |
158 | serial ports (ro) */ | |
159 | /* Defs for some of the generic I/O pins */ | |
160 | #define IOC4_GPCR_UART0_MODESEL 0x10 /* Pin is output to port 0 | |
161 | mode sel */ | |
162 | #define IOC4_GPCR_UART1_MODESEL 0x20 /* Pin is output to port 1 | |
163 | mode sel */ | |
164 | #define IOC4_GPCR_UART2_MODESEL 0x40 /* Pin is output to port 2 | |
165 | mode sel */ | |
166 | #define IOC4_GPCR_UART3_MODESEL 0x80 /* Pin is output to port 3 | |
167 | mode sel */ | |
168 | ||
169 | #define IOC4_GPPR_UART0_MODESEL_PIN 4 /* GIO pin controlling | |
170 | uart 0 mode select */ | |
171 | #define IOC4_GPPR_UART1_MODESEL_PIN 5 /* GIO pin controlling | |
172 | uart 1 mode select */ | |
173 | #define IOC4_GPPR_UART2_MODESEL_PIN 6 /* GIO pin controlling | |
174 | uart 2 mode select */ | |
175 | #define IOC4_GPPR_UART3_MODESEL_PIN 7 /* GIO pin controlling | |
176 | uart 3 mode select */ | |
177 | ||
178 | /* Bitmasks for serial RX status byte */ | |
179 | #define IOC4_RXSB_OVERRUN 0x01 /* Char(s) lost */ | |
180 | #define IOC4_RXSB_PAR_ERR 0x02 /* Parity error */ | |
181 | #define IOC4_RXSB_FRAME_ERR 0x04 /* Framing error */ | |
182 | #define IOC4_RXSB_BREAK 0x08 /* Break character */ | |
183 | #define IOC4_RXSB_CTS 0x10 /* State of CTS */ | |
184 | #define IOC4_RXSB_DCD 0x20 /* State of DCD */ | |
185 | #define IOC4_RXSB_MODEM_VALID 0x40 /* DCD, CTS, and OVERRUN are valid */ | |
186 | #define IOC4_RXSB_DATA_VALID 0x80 /* Data byte, FRAME_ERR PAR_ERR | |
187 | * & BREAK valid */ | |
188 | ||
189 | /* Bitmasks for serial TX control byte */ | |
190 | #define IOC4_TXCB_INT_WHEN_DONE 0x20 /* Interrupt after this byte is sent */ | |
191 | #define IOC4_TXCB_INVALID 0x00 /* Byte is invalid */ | |
192 | #define IOC4_TXCB_VALID 0x40 /* Byte is valid */ | |
193 | #define IOC4_TXCB_MCR 0x80 /* Data<7:0> to modem control reg */ | |
194 | #define IOC4_TXCB_DELAY 0xc0 /* Delay data<7:0> mSec */ | |
195 | ||
196 | /* Bitmasks for IOC4_SBBR_L */ | |
197 | #define IOC4_SBBR_L_SIZE 0x00000001 /* 0 == 1KB rings, 1 == 4KB rings */ | |
198 | ||
199 | /* Bitmasks for IOC4_SSCR_<3:0> */ | |
200 | #define IOC4_SSCR_RX_THRESHOLD 0x000001ff /* Hiwater mark */ | |
201 | #define IOC4_SSCR_TX_TIMER_BUSY 0x00010000 /* TX timer in progress */ | |
202 | #define IOC4_SSCR_HFC_EN 0x00020000 /* Hardware flow control enabled */ | |
203 | #define IOC4_SSCR_RX_RING_DCD 0x00040000 /* Post RX record on delta-DCD */ | |
204 | #define IOC4_SSCR_RX_RING_CTS 0x00080000 /* Post RX record on delta-CTS */ | |
205 | #define IOC4_SSCR_DIAG 0x00200000 /* Bypass clock divider for sim */ | |
206 | #define IOC4_SSCR_RX_DRAIN 0x08000000 /* Drain RX buffer to memory */ | |
207 | #define IOC4_SSCR_DMA_EN 0x10000000 /* Enable ring buffer DMA */ | |
208 | #define IOC4_SSCR_DMA_PAUSE 0x20000000 /* Pause DMA */ | |
209 | #define IOC4_SSCR_PAUSE_STATE 0x40000000 /* Sets when PAUSE takes effect */ | |
210 | #define IOC4_SSCR_RESET 0x80000000 /* Reset DMA channels */ | |
211 | ||
212 | /* All producer/comsumer pointers are the same bitfield */ | |
213 | #define IOC4_PROD_CONS_PTR_4K 0x00000ff8 /* For 4K buffers */ | |
214 | #define IOC4_PROD_CONS_PTR_1K 0x000003f8 /* For 1K buffers */ | |
215 | #define IOC4_PROD_CONS_PTR_OFF 3 | |
216 | ||
217 | /* Bitmasks for IOC4_SRCIR_<3:0> */ | |
218 | #define IOC4_SRCIR_ARM 0x80000000 /* Arm RX timer */ | |
219 | ||
220 | /* Bitmasks for IOC4_SHADOW_<3:0> */ | |
221 | #define IOC4_SHADOW_DR 0x00000001 /* Data ready */ | |
222 | #define IOC4_SHADOW_OE 0x00000002 /* Overrun error */ | |
223 | #define IOC4_SHADOW_PE 0x00000004 /* Parity error */ | |
224 | #define IOC4_SHADOW_FE 0x00000008 /* Framing error */ | |
225 | #define IOC4_SHADOW_BI 0x00000010 /* Break interrupt */ | |
226 | #define IOC4_SHADOW_THRE 0x00000020 /* Xmit holding register empty */ | |
227 | #define IOC4_SHADOW_TEMT 0x00000040 /* Xmit shift register empty */ | |
228 | #define IOC4_SHADOW_RFCE 0x00000080 /* Char in RX fifo has an error */ | |
229 | #define IOC4_SHADOW_DCTS 0x00010000 /* Delta clear to send */ | |
230 | #define IOC4_SHADOW_DDCD 0x00080000 /* Delta data carrier detect */ | |
231 | #define IOC4_SHADOW_CTS 0x00100000 /* Clear to send */ | |
232 | #define IOC4_SHADOW_DCD 0x00800000 /* Data carrier detect */ | |
233 | #define IOC4_SHADOW_DTR 0x01000000 /* Data terminal ready */ | |
234 | #define IOC4_SHADOW_RTS 0x02000000 /* Request to send */ | |
235 | #define IOC4_SHADOW_OUT1 0x04000000 /* 16550 OUT1 bit */ | |
236 | #define IOC4_SHADOW_OUT2 0x08000000 /* 16550 OUT2 bit */ | |
237 | #define IOC4_SHADOW_LOOP 0x10000000 /* Loopback enabled */ | |
238 | ||
239 | /* Bitmasks for IOC4_SRTR_<3:0> */ | |
240 | #define IOC4_SRTR_CNT 0x00000fff /* Reload value for RX timer */ | |
241 | #define IOC4_SRTR_CNT_VAL 0x0fff0000 /* Current value of RX timer */ | |
242 | #define IOC4_SRTR_CNT_VAL_SHIFT 16 | |
243 | #define IOC4_SRTR_HZ 16000 /* SRTR clock frequency */ | |
244 | ||
245 | /* Serial port register map used for DMA and PIO serial I/O */ | |
246 | struct ioc4_serialregs { | |
247 | uint32_t sscr; | |
248 | uint32_t stpir; | |
249 | uint32_t stcir; | |
250 | uint32_t srpir; | |
251 | uint32_t srcir; | |
252 | uint32_t srtr; | |
253 | uint32_t shadow; | |
254 | }; | |
255 | ||
256 | /* IOC4 UART register map */ | |
257 | struct ioc4_uartregs { | |
258 | char i4u_lcr; | |
259 | union { | |
260 | char iir; /* read only */ | |
261 | char fcr; /* write only */ | |
262 | } u3; | |
263 | union { | |
264 | char ier; /* DLAB == 0 */ | |
265 | char dlm; /* DLAB == 1 */ | |
266 | } u2; | |
267 | union { | |
268 | char rbr; /* read only, DLAB == 0 */ | |
269 | char thr; /* write only, DLAB == 0 */ | |
270 | char dll; /* DLAB == 1 */ | |
271 | } u1; | |
272 | char i4u_scr; | |
273 | char i4u_msr; | |
274 | char i4u_lsr; | |
275 | char i4u_mcr; | |
276 | }; | |
277 | ||
278 | /* short names */ | |
279 | #define i4u_dll u1.dll | |
280 | #define i4u_ier u2.ier | |
281 | #define i4u_dlm u2.dlm | |
282 | #define i4u_fcr u3.fcr | |
283 | ||
22329b51 BC |
284 | /* Serial port registers used for DMA serial I/O */ |
285 | struct ioc4_serial { | |
286 | uint32_t sbbr01_l; | |
287 | uint32_t sbbr01_h; | |
288 | uint32_t sbbr23_l; | |
289 | uint32_t sbbr23_h; | |
290 | ||
291 | struct ioc4_serialregs port_0; | |
292 | struct ioc4_serialregs port_1; | |
293 | struct ioc4_serialregs port_2; | |
294 | struct ioc4_serialregs port_3; | |
295 | struct ioc4_uartregs uart_0; | |
296 | struct ioc4_uartregs uart_1; | |
297 | struct ioc4_uartregs uart_2; | |
298 | struct ioc4_uartregs uart_3; | |
299 | } ioc4_serial; | |
1da177e4 LT |
300 | |
301 | /* UART clock speed */ | |
1da177e4 LT |
302 | #define IOC4_SER_XIN_CLK_66 66666667 |
303 | #define IOC4_SER_XIN_CLK_33 33333333 | |
304 | ||
305 | #define IOC4_W_IES 0 | |
306 | #define IOC4_W_IEC 1 | |
307 | ||
308 | typedef void ioc4_intr_func_f(void *, uint32_t); | |
309 | typedef ioc4_intr_func_f *ioc4_intr_func_t; | |
310 | ||
396dc44b PG |
311 | static unsigned int Num_of_ioc4_cards; |
312 | ||
1da177e4 LT |
313 | /* defining this will get you LOTS of great debug info */ |
314 | //#define DEBUG_INTERRUPTS | |
315 | #define DPRINT_CONFIG(_x...) ; | |
316 | //#define DPRINT_CONFIG(_x...) printk _x | |
317 | ||
318 | /* number of characters left in xmit buffer before we ask for more */ | |
319 | #define WAKEUP_CHARS 256 | |
320 | ||
321 | /* number of characters we want to transmit to the lower level at a time */ | |
396dc44b PG |
322 | #define IOC4_MAX_CHARS 256 |
323 | #define IOC4_FIFO_CHARS 255 | |
1da177e4 LT |
324 | |
325 | /* Device name we're using */ | |
326 | #define DEVICE_NAME "ttyIOC" | |
327 | #define DEVICE_MAJOR 204 | |
328 | #define DEVICE_MINOR 50 | |
329 | ||
330 | /* register offsets */ | |
331 | #define IOC4_SERIAL_OFFSET 0x300 | |
332 | ||
333 | /* flags for next_char_state */ | |
334 | #define NCS_BREAK 0x1 | |
335 | #define NCS_PARITY 0x2 | |
336 | #define NCS_FRAMING 0x4 | |
337 | #define NCS_OVERRUN 0x8 | |
338 | ||
339 | /* cause we need SOME parameters ... */ | |
340 | #define MIN_BAUD_SUPPORTED 1200 | |
341 | #define MAX_BAUD_SUPPORTED 115200 | |
342 | ||
343 | /* protocol types supported */ | |
344 | enum sio_proto { | |
345 | PROTO_RS232, | |
346 | PROTO_RS422 | |
347 | }; | |
348 | ||
349 | /* Notification types */ | |
350 | #define N_DATA_READY 0x01 | |
351 | #define N_OUTPUT_LOWAT 0x02 | |
352 | #define N_BREAK 0x04 | |
353 | #define N_PARITY_ERROR 0x08 | |
354 | #define N_FRAMING_ERROR 0x10 | |
355 | #define N_OVERRUN_ERROR 0x20 | |
356 | #define N_DDCD 0x40 | |
357 | #define N_DCTS 0x80 | |
358 | ||
359 | #define N_ALL_INPUT (N_DATA_READY | N_BREAK | \ | |
360 | N_PARITY_ERROR | N_FRAMING_ERROR | \ | |
361 | N_OVERRUN_ERROR | N_DDCD | N_DCTS) | |
362 | ||
363 | #define N_ALL_OUTPUT N_OUTPUT_LOWAT | |
364 | ||
365 | #define N_ALL_ERRORS (N_PARITY_ERROR | N_FRAMING_ERROR | N_OVERRUN_ERROR) | |
366 | ||
367 | #define N_ALL (N_DATA_READY | N_OUTPUT_LOWAT | N_BREAK | \ | |
368 | N_PARITY_ERROR | N_FRAMING_ERROR | \ | |
369 | N_OVERRUN_ERROR | N_DDCD | N_DCTS) | |
370 | ||
371 | #define SER_DIVISOR(_x, clk) (((clk) + (_x) * 8) / ((_x) * 16)) | |
372 | #define DIVISOR_TO_BAUD(div, clk) ((clk) / 16 / (div)) | |
373 | ||
374 | /* Some masks */ | |
375 | #define LCR_MASK_BITS_CHAR (UART_LCR_WLEN5 | UART_LCR_WLEN6 \ | |
376 | | UART_LCR_WLEN7 | UART_LCR_WLEN8) | |
377 | #define LCR_MASK_STOP_BITS (UART_LCR_STOP) | |
378 | ||
22329b51 BC |
379 | #define PENDING(_p) (readl(&(_p)->ip_mem->sio_ir.raw) & _p->ip_ienb) |
380 | #define READ_SIO_IR(_p) readl(&(_p)->ip_mem->sio_ir.raw) | |
1da177e4 LT |
381 | |
382 | /* Default to 4k buffers */ | |
383 | #ifdef IOC4_1K_BUFFERS | |
384 | #define RING_BUF_SIZE 1024 | |
385 | #define IOC4_BUF_SIZE_BIT 0 | |
386 | #define PROD_CONS_MASK IOC4_PROD_CONS_PTR_1K | |
387 | #else | |
388 | #define RING_BUF_SIZE 4096 | |
389 | #define IOC4_BUF_SIZE_BIT IOC4_SBBR_L_SIZE | |
390 | #define PROD_CONS_MASK IOC4_PROD_CONS_PTR_4K | |
391 | #endif | |
392 | ||
393 | #define TOTAL_RING_BUF_SIZE (RING_BUF_SIZE * 4) | |
394 | ||
395 | /* | |
396 | * This is the entry saved by the driver - one per card | |
397 | */ | |
398 | struct ioc4_control { | |
399 | int ic_irq; | |
400 | struct { | |
401 | /* uart ports are allocated here */ | |
402 | struct uart_port icp_uart_port; | |
403 | /* Handy reference material */ | |
404 | struct ioc4_port *icp_port; | |
405 | } ic_port[IOC4_NUM_SERIAL_PORTS]; | |
406 | struct ioc4_soft *ic_soft; | |
407 | }; | |
408 | ||
409 | /* | |
410 | * per-IOC4 data structure | |
411 | */ | |
412 | #define MAX_IOC4_INTR_ENTS (8 * sizeof(uint32_t)) | |
413 | struct ioc4_soft { | |
22329b51 | 414 | struct ioc4_misc_regs __iomem *is_ioc4_misc_addr; |
1da177e4 LT |
415 | struct ioc4_serial __iomem *is_ioc4_serial_addr; |
416 | ||
417 | /* Each interrupt type has an entry in the array */ | |
418 | struct ioc4_intr_type { | |
419 | ||
420 | /* | |
421 | * Each in-use entry in this array contains at least | |
422 | * one nonzero bit in sd_bits; no two entries in this | |
423 | * array have overlapping sd_bits values. | |
424 | */ | |
425 | struct ioc4_intr_info { | |
426 | uint32_t sd_bits; | |
427 | ioc4_intr_func_f *sd_intr; | |
428 | void *sd_info; | |
429 | } is_intr_info[MAX_IOC4_INTR_ENTS]; | |
430 | ||
431 | /* Number of entries active in the above array */ | |
432 | atomic_t is_num_intrs; | |
433 | } is_intr_type[IOC4_NUM_INTR_TYPES]; | |
434 | ||
435 | /* is_ir_lock must be held while | |
436 | * modifying sio_ie values, so | |
437 | * we can be sure that sio_ie is | |
438 | * not changing when we read it | |
439 | * along with sio_ir. | |
440 | */ | |
441 | spinlock_t is_ir_lock; /* SIO_IE[SC] mod lock */ | |
442 | }; | |
443 | ||
444 | /* Local port info for each IOC4 serial ports */ | |
445 | struct ioc4_port { | |
446 | struct uart_port *ip_port; | |
447 | /* Back ptrs for this port */ | |
448 | struct ioc4_control *ip_control; | |
449 | struct pci_dev *ip_pdev; | |
450 | struct ioc4_soft *ip_ioc4_soft; | |
451 | ||
452 | /* pci mem addresses */ | |
22329b51 | 453 | struct ioc4_misc_regs __iomem *ip_mem; |
1da177e4 LT |
454 | struct ioc4_serial __iomem *ip_serial; |
455 | struct ioc4_serialregs __iomem *ip_serial_regs; | |
456 | struct ioc4_uartregs __iomem *ip_uart_regs; | |
457 | ||
458 | /* Ring buffer page for this port */ | |
459 | dma_addr_t ip_dma_ringbuf; | |
460 | /* vaddr of ring buffer */ | |
461 | struct ring_buffer *ip_cpu_ringbuf; | |
462 | ||
463 | /* Rings for this port */ | |
464 | struct ring *ip_inring; | |
465 | struct ring *ip_outring; | |
466 | ||
467 | /* Hook to port specific values */ | |
468 | struct hooks *ip_hooks; | |
469 | ||
470 | spinlock_t ip_lock; | |
471 | ||
472 | /* Various rx/tx parameters */ | |
473 | int ip_baud; | |
474 | int ip_tx_lowat; | |
475 | int ip_rx_timeout; | |
476 | ||
477 | /* Copy of notification bits */ | |
478 | int ip_notify; | |
479 | ||
480 | /* Shadow copies of various registers so we don't need to PIO | |
481 | * read them constantly | |
482 | */ | |
483 | uint32_t ip_ienb; /* Enabled interrupts */ | |
484 | uint32_t ip_sscr; | |
485 | uint32_t ip_tx_prod; | |
486 | uint32_t ip_rx_cons; | |
487 | int ip_pci_bus_speed; | |
488 | unsigned char ip_flags; | |
489 | }; | |
490 | ||
491 | /* tx low water mark. We need to notify the driver whenever tx is getting | |
492 | * close to empty so it can refill the tx buffer and keep things going. | |
493 | * Let's assume that if we interrupt 1 ms before the tx goes idle, we'll | |
494 | * have no trouble getting in more chars in time (I certainly hope so). | |
495 | */ | |
496 | #define TX_LOWAT_LATENCY 1000 | |
497 | #define TX_LOWAT_HZ (1000000 / TX_LOWAT_LATENCY) | |
498 | #define TX_LOWAT_CHARS(baud) (baud / 10 / TX_LOWAT_HZ) | |
499 | ||
500 | /* Flags per port */ | |
501 | #define INPUT_HIGH 0x01 | |
502 | #define DCD_ON 0x02 | |
503 | #define LOWAT_WRITTEN 0x04 | |
504 | #define READ_ABORTED 0x08 | |
505 | ||
506 | /* Since each port has different register offsets and bitmasks | |
507 | * for everything, we'll store those that we need in tables so we | |
508 | * don't have to be constantly checking the port we are dealing with. | |
509 | */ | |
510 | struct hooks { | |
511 | uint32_t intr_delta_dcd; | |
512 | uint32_t intr_delta_cts; | |
513 | uint32_t intr_tx_mt; | |
514 | uint32_t intr_rx_timer; | |
515 | uint32_t intr_rx_high; | |
516 | uint32_t intr_tx_explicit; | |
517 | uint32_t intr_dma_error; | |
518 | uint32_t intr_clear; | |
519 | uint32_t intr_all; | |
22329b51 | 520 | int rs422_select_pin; |
1da177e4 LT |
521 | }; |
522 | ||
523 | static struct hooks hooks_array[IOC4_NUM_SERIAL_PORTS] = { | |
524 | /* Values for port 0 */ | |
525 | { | |
526 | IOC4_SIO_IR_S0_DELTA_DCD, IOC4_SIO_IR_S0_DELTA_CTS, | |
527 | IOC4_SIO_IR_S0_TX_MT, IOC4_SIO_IR_S0_RX_TIMER, | |
528 | IOC4_SIO_IR_S0_RX_HIGH, IOC4_SIO_IR_S0_TX_EXPLICIT, | |
529 | IOC4_OTHER_IR_S0_MEMERR, | |
530 | (IOC4_SIO_IR_S0_TX_MT | IOC4_SIO_IR_S0_RX_FULL | | |
531 | IOC4_SIO_IR_S0_RX_HIGH | IOC4_SIO_IR_S0_RX_TIMER | | |
532 | IOC4_SIO_IR_S0_DELTA_DCD | IOC4_SIO_IR_S0_DELTA_CTS | | |
533 | IOC4_SIO_IR_S0_INT | IOC4_SIO_IR_S0_TX_EXPLICIT), | |
534 | IOC4_SIO_IR_S0, IOC4_GPPR_UART0_MODESEL_PIN, | |
535 | }, | |
536 | ||
537 | /* Values for port 1 */ | |
538 | { | |
539 | IOC4_SIO_IR_S1_DELTA_DCD, IOC4_SIO_IR_S1_DELTA_CTS, | |
540 | IOC4_SIO_IR_S1_TX_MT, IOC4_SIO_IR_S1_RX_TIMER, | |
541 | IOC4_SIO_IR_S1_RX_HIGH, IOC4_SIO_IR_S1_TX_EXPLICIT, | |
542 | IOC4_OTHER_IR_S1_MEMERR, | |
543 | (IOC4_SIO_IR_S1_TX_MT | IOC4_SIO_IR_S1_RX_FULL | | |
544 | IOC4_SIO_IR_S1_RX_HIGH | IOC4_SIO_IR_S1_RX_TIMER | | |
545 | IOC4_SIO_IR_S1_DELTA_DCD | IOC4_SIO_IR_S1_DELTA_CTS | | |
546 | IOC4_SIO_IR_S1_INT | IOC4_SIO_IR_S1_TX_EXPLICIT), | |
547 | IOC4_SIO_IR_S1, IOC4_GPPR_UART1_MODESEL_PIN, | |
548 | }, | |
549 | ||
550 | /* Values for port 2 */ | |
551 | { | |
552 | IOC4_SIO_IR_S2_DELTA_DCD, IOC4_SIO_IR_S2_DELTA_CTS, | |
553 | IOC4_SIO_IR_S2_TX_MT, IOC4_SIO_IR_S2_RX_TIMER, | |
554 | IOC4_SIO_IR_S2_RX_HIGH, IOC4_SIO_IR_S2_TX_EXPLICIT, | |
555 | IOC4_OTHER_IR_S2_MEMERR, | |
556 | (IOC4_SIO_IR_S2_TX_MT | IOC4_SIO_IR_S2_RX_FULL | | |
557 | IOC4_SIO_IR_S2_RX_HIGH | IOC4_SIO_IR_S2_RX_TIMER | | |
558 | IOC4_SIO_IR_S2_DELTA_DCD | IOC4_SIO_IR_S2_DELTA_CTS | | |
559 | IOC4_SIO_IR_S2_INT | IOC4_SIO_IR_S2_TX_EXPLICIT), | |
560 | IOC4_SIO_IR_S2, IOC4_GPPR_UART2_MODESEL_PIN, | |
561 | }, | |
562 | ||
563 | /* Values for port 3 */ | |
564 | { | |
565 | IOC4_SIO_IR_S3_DELTA_DCD, IOC4_SIO_IR_S3_DELTA_CTS, | |
566 | IOC4_SIO_IR_S3_TX_MT, IOC4_SIO_IR_S3_RX_TIMER, | |
567 | IOC4_SIO_IR_S3_RX_HIGH, IOC4_SIO_IR_S3_TX_EXPLICIT, | |
568 | IOC4_OTHER_IR_S3_MEMERR, | |
569 | (IOC4_SIO_IR_S3_TX_MT | IOC4_SIO_IR_S3_RX_FULL | | |
570 | IOC4_SIO_IR_S3_RX_HIGH | IOC4_SIO_IR_S3_RX_TIMER | | |
571 | IOC4_SIO_IR_S3_DELTA_DCD | IOC4_SIO_IR_S3_DELTA_CTS | | |
572 | IOC4_SIO_IR_S3_INT | IOC4_SIO_IR_S3_TX_EXPLICIT), | |
573 | IOC4_SIO_IR_S3, IOC4_GPPR_UART3_MODESEL_PIN, | |
574 | } | |
575 | }; | |
576 | ||
577 | /* A ring buffer entry */ | |
578 | struct ring_entry { | |
579 | union { | |
580 | struct { | |
581 | uint32_t alldata; | |
582 | uint32_t allsc; | |
583 | } all; | |
584 | struct { | |
585 | char data[4]; /* data bytes */ | |
586 | char sc[4]; /* status/control */ | |
587 | } s; | |
588 | } u; | |
589 | }; | |
590 | ||
591 | /* Test the valid bits in any of the 4 sc chars using "allsc" member */ | |
592 | #define RING_ANY_VALID \ | |
593 | ((uint32_t)(IOC4_RXSB_MODEM_VALID | IOC4_RXSB_DATA_VALID) * 0x01010101) | |
594 | ||
595 | #define ring_sc u.s.sc | |
596 | #define ring_data u.s.data | |
597 | #define ring_allsc u.all.allsc | |
598 | ||
599 | /* Number of entries per ring buffer. */ | |
600 | #define ENTRIES_PER_RING (RING_BUF_SIZE / (int) sizeof(struct ring_entry)) | |
601 | ||
602 | /* An individual ring */ | |
603 | struct ring { | |
604 | struct ring_entry entries[ENTRIES_PER_RING]; | |
605 | }; | |
606 | ||
607 | /* The whole enchilada */ | |
608 | struct ring_buffer { | |
609 | struct ring TX_0_OR_2; | |
610 | struct ring RX_0_OR_2; | |
611 | struct ring TX_1_OR_3; | |
612 | struct ring RX_1_OR_3; | |
613 | }; | |
614 | ||
615 | /* Get a ring from a port struct */ | |
616 | #define RING(_p, _wh) &(((struct ring_buffer *)((_p)->ip_cpu_ringbuf))->_wh) | |
617 | ||
618 | /* Infinite loop detection. | |
619 | */ | |
620 | #define MAXITER 10000000 | |
621 | ||
622 | /* Prototypes */ | |
623 | static void receive_chars(struct uart_port *); | |
624 | static void handle_intr(void *arg, uint32_t sio_ir); | |
625 | ||
626 | /** | |
627 | * write_ireg - write the interrupt regs | |
628 | * @ioc4_soft: ptr to soft struct for this port | |
629 | * @val: value to write | |
630 | * @which: which register | |
631 | * @type: which ireg set | |
632 | */ | |
633 | static inline void | |
634 | write_ireg(struct ioc4_soft *ioc4_soft, uint32_t val, int which, int type) | |
635 | { | |
22329b51 | 636 | struct ioc4_misc_regs __iomem *mem = ioc4_soft->is_ioc4_misc_addr; |
1da177e4 LT |
637 | unsigned long flags; |
638 | ||
639 | spin_lock_irqsave(&ioc4_soft->is_ir_lock, flags); | |
640 | ||
641 | switch (type) { | |
642 | case IOC4_SIO_INTR_TYPE: | |
643 | switch (which) { | |
644 | case IOC4_W_IES: | |
22329b51 | 645 | writel(val, &mem->sio_ies.raw); |
1da177e4 LT |
646 | break; |
647 | ||
648 | case IOC4_W_IEC: | |
22329b51 | 649 | writel(val, &mem->sio_iec.raw); |
1da177e4 LT |
650 | break; |
651 | } | |
652 | break; | |
653 | ||
654 | case IOC4_OTHER_INTR_TYPE: | |
655 | switch (which) { | |
656 | case IOC4_W_IES: | |
22329b51 | 657 | writel(val, &mem->other_ies.raw); |
1da177e4 LT |
658 | break; |
659 | ||
660 | case IOC4_W_IEC: | |
22329b51 | 661 | writel(val, &mem->other_iec.raw); |
1da177e4 LT |
662 | break; |
663 | } | |
664 | break; | |
665 | ||
666 | default: | |
667 | break; | |
668 | } | |
669 | spin_unlock_irqrestore(&ioc4_soft->is_ir_lock, flags); | |
670 | } | |
671 | ||
672 | /** | |
673 | * set_baud - Baud rate setting code | |
674 | * @port: port to set | |
675 | * @baud: baud rate to use | |
676 | */ | |
677 | static int set_baud(struct ioc4_port *port, int baud) | |
678 | { | |
679 | int actual_baud; | |
680 | int diff; | |
681 | int lcr; | |
682 | unsigned short divisor; | |
683 | struct ioc4_uartregs __iomem *uart; | |
684 | ||
685 | divisor = SER_DIVISOR(baud, port->ip_pci_bus_speed); | |
686 | if (!divisor) | |
687 | return 1; | |
688 | actual_baud = DIVISOR_TO_BAUD(divisor, port->ip_pci_bus_speed); | |
689 | ||
690 | diff = actual_baud - baud; | |
691 | if (diff < 0) | |
692 | diff = -diff; | |
693 | ||
694 | /* If we're within 1%, we've found a match */ | |
695 | if (diff * 100 > actual_baud) | |
696 | return 1; | |
697 | ||
698 | uart = port->ip_uart_regs; | |
699 | lcr = readb(&uart->i4u_lcr); | |
700 | writeb(lcr | UART_LCR_DLAB, &uart->i4u_lcr); | |
701 | writeb((unsigned char)divisor, &uart->i4u_dll); | |
702 | writeb((unsigned char)(divisor >> 8), &uart->i4u_dlm); | |
703 | writeb(lcr, &uart->i4u_lcr); | |
704 | return 0; | |
705 | } | |
706 | ||
707 | ||
708 | /** | |
709 | * get_ioc4_port - given a uart port, return the control structure | |
710 | * @port: uart port | |
711 | */ | |
712 | static struct ioc4_port *get_ioc4_port(struct uart_port *the_port) | |
713 | { | |
22329b51 BC |
714 | struct ioc4_driver_data *idd = dev_get_drvdata(the_port->dev); |
715 | struct ioc4_control *control = idd->idd_serial_data; | |
1da177e4 LT |
716 | int ii; |
717 | ||
718 | if (control) { | |
719 | for ( ii = 0; ii < IOC4_NUM_SERIAL_PORTS; ii++ ) { | |
720 | if (!control->ic_port[ii].icp_port) | |
721 | continue; | |
722 | if (the_port == control->ic_port[ii].icp_port->ip_port) | |
723 | return control->ic_port[ii].icp_port; | |
724 | } | |
725 | } | |
726 | return NULL; | |
727 | } | |
728 | ||
729 | /* The IOC4 hardware provides no atomic way to determine if interrupts | |
730 | * are pending since two reads are required to do so. The handler must | |
731 | * read the SIO_IR and the SIO_IES, and take the logical and of the | |
732 | * two. When this value is zero, all interrupts have been serviced and | |
733 | * the handler may return. | |
734 | * | |
735 | * This has the unfortunate "hole" that, if some other CPU or | |
736 | * some other thread or some higher level interrupt manages to | |
737 | * modify SIO_IE between our reads of SIO_IR and SIO_IE, we may | |
738 | * think we have observed SIO_IR&SIO_IE==0 when in fact this | |
739 | * condition never really occurred. | |
740 | * | |
741 | * To solve this, we use a simple spinlock that must be held | |
742 | * whenever modifying SIO_IE; holding this lock while observing | |
743 | * both SIO_IR and SIO_IE guarantees that we do not falsely | |
744 | * conclude that no enabled interrupts are pending. | |
745 | */ | |
746 | ||
747 | static inline uint32_t | |
748 | pending_intrs(struct ioc4_soft *soft, int type) | |
749 | { | |
22329b51 | 750 | struct ioc4_misc_regs __iomem *mem = soft->is_ioc4_misc_addr; |
1da177e4 LT |
751 | unsigned long flag; |
752 | uint32_t intrs = 0; | |
753 | ||
754 | BUG_ON(!((type == IOC4_SIO_INTR_TYPE) | |
755 | || (type == IOC4_OTHER_INTR_TYPE))); | |
756 | ||
757 | spin_lock_irqsave(&soft->is_ir_lock, flag); | |
758 | ||
759 | switch (type) { | |
760 | case IOC4_SIO_INTR_TYPE: | |
22329b51 | 761 | intrs = readl(&mem->sio_ir.raw) & readl(&mem->sio_ies.raw); |
1da177e4 LT |
762 | break; |
763 | ||
764 | case IOC4_OTHER_INTR_TYPE: | |
22329b51 | 765 | intrs = readl(&mem->other_ir.raw) & readl(&mem->other_ies.raw); |
1da177e4 LT |
766 | |
767 | /* Don't process any ATA interrupte */ | |
768 | intrs &= ~(IOC4_OTHER_IR_ATA_INT | IOC4_OTHER_IR_ATA_MEMERR); | |
769 | break; | |
770 | ||
771 | default: | |
772 | break; | |
773 | } | |
774 | spin_unlock_irqrestore(&soft->is_ir_lock, flag); | |
775 | return intrs; | |
776 | } | |
777 | ||
778 | /** | |
779 | * port_init - Initialize the sio and ioc4 hardware for a given port | |
780 | * called per port from attach... | |
781 | * @port: port to initialize | |
782 | */ | |
783 | static int inline port_init(struct ioc4_port *port) | |
784 | { | |
785 | uint32_t sio_cr; | |
786 | struct hooks *hooks = port->ip_hooks; | |
787 | struct ioc4_uartregs __iomem *uart; | |
788 | ||
789 | /* Idle the IOC4 serial interface */ | |
790 | writel(IOC4_SSCR_RESET, &port->ip_serial_regs->sscr); | |
791 | ||
792 | /* Wait until any pending bus activity for this port has ceased */ | |
793 | do | |
22329b51 | 794 | sio_cr = readl(&port->ip_mem->sio_cr.raw); |
1da177e4 LT |
795 | while (!(sio_cr & IOC4_SIO_CR_SIO_DIAG_IDLE)); |
796 | ||
797 | /* Finish reset sequence */ | |
798 | writel(0, &port->ip_serial_regs->sscr); | |
799 | ||
800 | /* Once RESET is done, reload cached tx_prod and rx_cons values | |
801 | * and set rings to empty by making prod == cons | |
802 | */ | |
803 | port->ip_tx_prod = readl(&port->ip_serial_regs->stcir) & PROD_CONS_MASK; | |
804 | writel(port->ip_tx_prod, &port->ip_serial_regs->stpir); | |
805 | port->ip_rx_cons = readl(&port->ip_serial_regs->srpir) & PROD_CONS_MASK; | |
5b052d8b | 806 | writel(port->ip_rx_cons | IOC4_SRCIR_ARM, &port->ip_serial_regs->srcir); |
1da177e4 LT |
807 | |
808 | /* Disable interrupts for this 16550 */ | |
809 | uart = port->ip_uart_regs; | |
810 | writeb(0, &uart->i4u_lcr); | |
811 | writeb(0, &uart->i4u_ier); | |
812 | ||
813 | /* Set the default baud */ | |
814 | set_baud(port, port->ip_baud); | |
815 | ||
816 | /* Set line control to 8 bits no parity */ | |
817 | writeb(UART_LCR_WLEN8 | 0, &uart->i4u_lcr); | |
818 | /* UART_LCR_STOP == 1 stop */ | |
819 | ||
820 | /* Enable the FIFOs */ | |
821 | writeb(UART_FCR_ENABLE_FIFO, &uart->i4u_fcr); | |
822 | /* then reset 16550 FIFOs */ | |
823 | writeb(UART_FCR_ENABLE_FIFO | UART_FCR_CLEAR_RCVR | UART_FCR_CLEAR_XMIT, | |
824 | &uart->i4u_fcr); | |
825 | ||
826 | /* Clear modem control register */ | |
827 | writeb(0, &uart->i4u_mcr); | |
828 | ||
829 | /* Clear deltas in modem status register */ | |
830 | readb(&uart->i4u_msr); | |
831 | ||
832 | /* Only do this once per port pair */ | |
833 | if (port->ip_hooks == &hooks_array[0] | |
834 | || port->ip_hooks == &hooks_array[2]) { | |
835 | unsigned long ring_pci_addr; | |
836 | uint32_t __iomem *sbbr_l; | |
837 | uint32_t __iomem *sbbr_h; | |
838 | ||
839 | if (port->ip_hooks == &hooks_array[0]) { | |
840 | sbbr_l = &port->ip_serial->sbbr01_l; | |
841 | sbbr_h = &port->ip_serial->sbbr01_h; | |
842 | } else { | |
843 | sbbr_l = &port->ip_serial->sbbr23_l; | |
844 | sbbr_h = &port->ip_serial->sbbr23_h; | |
845 | } | |
846 | ||
847 | ring_pci_addr = (unsigned long __iomem)port->ip_dma_ringbuf; | |
848 | DPRINT_CONFIG(("%s: ring_pci_addr 0x%lx\n", | |
849 | __FUNCTION__, ring_pci_addr)); | |
850 | ||
851 | writel((unsigned int)((uint64_t)ring_pci_addr >> 32), sbbr_h); | |
852 | writel((unsigned int)ring_pci_addr | IOC4_BUF_SIZE_BIT, sbbr_l); | |
853 | } | |
854 | ||
855 | /* Set the receive timeout value to 10 msec */ | |
856 | writel(IOC4_SRTR_HZ / 100, &port->ip_serial_regs->srtr); | |
857 | ||
858 | /* Set rx threshold, enable DMA */ | |
859 | /* Set high water mark at 3/4 of full ring */ | |
860 | port->ip_sscr = (ENTRIES_PER_RING * 3 / 4); | |
861 | writel(port->ip_sscr, &port->ip_serial_regs->sscr); | |
862 | ||
863 | /* Disable and clear all serial related interrupt bits */ | |
864 | write_ireg(port->ip_ioc4_soft, hooks->intr_clear, | |
865 | IOC4_W_IEC, IOC4_SIO_INTR_TYPE); | |
866 | port->ip_ienb &= ~hooks->intr_clear; | |
22329b51 | 867 | writel(hooks->intr_clear, &port->ip_mem->sio_ir.raw); |
1da177e4 LT |
868 | return 0; |
869 | } | |
870 | ||
871 | /** | |
872 | * handle_dma_error_intr - service any pending DMA error interrupts for the | |
873 | * given port - 2nd level called via sd_intr | |
874 | * @arg: handler arg | |
875 | * @other_ir: ioc4regs | |
876 | */ | |
877 | static void handle_dma_error_intr(void *arg, uint32_t other_ir) | |
878 | { | |
879 | struct ioc4_port *port = (struct ioc4_port *)arg; | |
880 | struct hooks *hooks = port->ip_hooks; | |
881 | unsigned int flags; | |
882 | ||
883 | spin_lock_irqsave(&port->ip_lock, flags); | |
884 | ||
885 | /* ACK the interrupt */ | |
22329b51 | 886 | writel(hooks->intr_dma_error, &port->ip_mem->other_ir.raw); |
1da177e4 | 887 | |
22329b51 | 888 | if (readl(&port->ip_mem->pci_err_addr_l.raw) & IOC4_PCI_ERR_ADDR_VLD) { |
1da177e4 LT |
889 | printk(KERN_ERR |
890 | "PCI error address is 0x%lx, " | |
891 | "master is serial port %c %s\n", | |
892 | (((uint64_t)readl(&port->ip_mem->pci_err_addr_h) | |
893 | << 32) | |
22329b51 | 894 | | readl(&port->ip_mem->pci_err_addr_l.raw)) |
1da177e4 | 895 | & IOC4_PCI_ERR_ADDR_ADDR_MSK, '1' + |
22329b51 | 896 | ((char)(readl(&port->ip_mem->pci_err_addr_l.raw) & |
1da177e4 | 897 | IOC4_PCI_ERR_ADDR_MST_NUM_MSK) >> 1), |
22329b51 | 898 | (readl(&port->ip_mem->pci_err_addr_l.raw) |
1da177e4 LT |
899 | & IOC4_PCI_ERR_ADDR_MST_TYP_MSK) |
900 | ? "RX" : "TX"); | |
901 | ||
22329b51 | 902 | if (readl(&port->ip_mem->pci_err_addr_l.raw) |
1da177e4 LT |
903 | & IOC4_PCI_ERR_ADDR_MUL_ERR) { |
904 | printk(KERN_ERR | |
905 | "Multiple errors occurred\n"); | |
906 | } | |
907 | } | |
908 | spin_unlock_irqrestore(&port->ip_lock, flags); | |
909 | ||
910 | /* Re-enable DMA error interrupts */ | |
911 | write_ireg(port->ip_ioc4_soft, hooks->intr_dma_error, IOC4_W_IES, | |
912 | IOC4_OTHER_INTR_TYPE); | |
913 | } | |
914 | ||
915 | /** | |
916 | * intr_connect - interrupt connect function | |
917 | * @soft: soft struct for this card | |
918 | * @type: interrupt type | |
919 | * @intrbits: bit pattern to set | |
920 | * @intr: handler function | |
921 | * @info: handler arg | |
922 | */ | |
923 | static void | |
924 | intr_connect(struct ioc4_soft *soft, int type, | |
925 | uint32_t intrbits, ioc4_intr_func_f * intr, void *info) | |
926 | { | |
927 | int i; | |
928 | struct ioc4_intr_info *intr_ptr; | |
929 | ||
930 | BUG_ON(!((type == IOC4_SIO_INTR_TYPE) | |
931 | || (type == IOC4_OTHER_INTR_TYPE))); | |
932 | ||
933 | i = atomic_inc(&soft-> is_intr_type[type].is_num_intrs) - 1; | |
934 | BUG_ON(!(i < MAX_IOC4_INTR_ENTS || (printk("i %d\n", i), 0))); | |
935 | ||
936 | /* Save off the lower level interrupt handler */ | |
937 | intr_ptr = &soft->is_intr_type[type].is_intr_info[i]; | |
938 | intr_ptr->sd_bits = intrbits; | |
939 | intr_ptr->sd_intr = intr; | |
940 | intr_ptr->sd_info = info; | |
941 | } | |
942 | ||
943 | /** | |
944 | * ioc4_intr - Top level IOC4 interrupt handler. | |
945 | * @irq: irq value | |
946 | * @arg: handler arg | |
947 | * @regs: registers | |
948 | */ | |
949 | static irqreturn_t ioc4_intr(int irq, void *arg, struct pt_regs *regs) | |
950 | { | |
951 | struct ioc4_soft *soft; | |
952 | uint32_t this_ir, this_mir; | |
953 | int xx, num_intrs = 0; | |
954 | int intr_type; | |
955 | int handled = 0; | |
956 | struct ioc4_intr_info *ii; | |
957 | ||
958 | soft = arg; | |
959 | for (intr_type = 0; intr_type < IOC4_NUM_INTR_TYPES; intr_type++) { | |
960 | num_intrs = (int)atomic_read( | |
961 | &soft->is_intr_type[intr_type].is_num_intrs); | |
962 | ||
963 | this_mir = this_ir = pending_intrs(soft, intr_type); | |
964 | ||
965 | /* Farm out the interrupt to the various drivers depending on | |
966 | * which interrupt bits are set. | |
967 | */ | |
968 | for (xx = 0; xx < num_intrs; xx++) { | |
969 | ii = &soft->is_intr_type[intr_type].is_intr_info[xx]; | |
970 | if ((this_mir = this_ir & ii->sd_bits)) { | |
971 | /* Disable owned interrupts, call handler */ | |
972 | handled++; | |
973 | write_ireg(soft, ii->sd_bits, IOC4_W_IEC, | |
974 | intr_type); | |
975 | ii->sd_intr(ii->sd_info, this_mir); | |
976 | this_ir &= ~this_mir; | |
977 | } | |
978 | } | |
1da177e4 LT |
979 | } |
980 | #ifdef DEBUG_INTERRUPTS | |
981 | { | |
22329b51 | 982 | struct ioc4_misc_regs __iomem *mem = soft->is_ioc4_misc_addr; |
1da177e4 LT |
983 | spinlock_t *lp = &soft->is_ir_lock; |
984 | unsigned long flag; | |
985 | ||
986 | spin_lock_irqsave(&soft->is_ir_lock, flag); | |
22329b51 BC |
987 | printk ("%s : %d : mem 0x%p sio_ir 0x%x sio_ies 0x%x " |
988 | "other_ir 0x%x other_ies 0x%x mask 0x%x\n", | |
1da177e4 | 989 | __FUNCTION__, __LINE__, |
22329b51 BC |
990 | (void *)mem, readl(&mem->sio_ir.raw), |
991 | readl(&mem->sio_ies.raw), | |
992 | readl(&mem->other_ir.raw), | |
993 | readl(&mem->other_ies.raw), | |
1da177e4 LT |
994 | IOC4_OTHER_IR_ATA_INT | IOC4_OTHER_IR_ATA_MEMERR); |
995 | spin_unlock_irqrestore(&soft->is_ir_lock, flag); | |
996 | } | |
997 | #endif | |
998 | return handled ? IRQ_HANDLED : IRQ_NONE; | |
999 | } | |
1000 | ||
1001 | /** | |
1002 | * ioc4_attach_local - Device initialization. | |
1003 | * Called at *_attach() time for each | |
1004 | * IOC4 with serial ports in the system. | |
d4c477ca | 1005 | * @idd: Master module data for this IOC4 |
1da177e4 | 1006 | */ |
d4c477ca | 1007 | static int inline ioc4_attach_local(struct ioc4_driver_data *idd) |
1da177e4 LT |
1008 | { |
1009 | struct ioc4_port *port; | |
1010 | struct ioc4_port *ports[IOC4_NUM_SERIAL_PORTS]; | |
1011 | int port_number; | |
1012 | uint16_t ioc4_revid_min = 62; | |
1013 | uint16_t ioc4_revid; | |
d4c477ca BC |
1014 | struct pci_dev *pdev = idd->idd_pdev; |
1015 | struct ioc4_control* control = idd->idd_serial_data; | |
1016 | struct ioc4_soft *soft = control->ic_soft; | |
1017 | void __iomem *ioc4_misc = idd->idd_misc_regs; | |
1018 | void __iomem *ioc4_serial = soft->is_ioc4_serial_addr; | |
1da177e4 LT |
1019 | |
1020 | /* IOC4 firmware must be at least rev 62 */ | |
1021 | pci_read_config_word(pdev, PCI_COMMAND_SPECIAL, &ioc4_revid); | |
1022 | ||
1023 | printk(KERN_INFO "IOC4 firmware revision %d\n", ioc4_revid); | |
1024 | if (ioc4_revid < ioc4_revid_min) { | |
1025 | printk(KERN_WARNING | |
1026 | "IOC4 serial not supported on firmware rev %d, " | |
1027 | "please upgrade to rev %d or higher\n", | |
1028 | ioc4_revid, ioc4_revid_min); | |
1029 | return -EPERM; | |
1030 | } | |
22329b51 | 1031 | BUG_ON(ioc4_misc == NULL); |
1da177e4 LT |
1032 | BUG_ON(ioc4_serial == NULL); |
1033 | ||
1034 | /* Create port structures for each port */ | |
1035 | for (port_number = 0; port_number < IOC4_NUM_SERIAL_PORTS; | |
1036 | port_number++) { | |
1037 | port = kmalloc(sizeof(struct ioc4_port), GFP_KERNEL); | |
1038 | if (!port) { | |
1039 | printk(KERN_WARNING | |
1040 | "IOC4 serial memory not available for port\n"); | |
1041 | return -ENOMEM; | |
1042 | } | |
1043 | memset(port, 0, sizeof(struct ioc4_port)); | |
396dc44b | 1044 | spin_lock_init(&port->ip_lock); |
1da177e4 LT |
1045 | |
1046 | /* we need to remember the previous ones, to point back to | |
1047 | * them farther down - setting up the ring buffers. | |
1048 | */ | |
1049 | ports[port_number] = port; | |
1050 | ||
1051 | /* Allocate buffers and jumpstart the hardware. */ | |
1052 | control->ic_port[port_number].icp_port = port; | |
1053 | port->ip_ioc4_soft = soft; | |
1054 | port->ip_pdev = pdev; | |
1055 | port->ip_ienb = 0; | |
d4c477ca BC |
1056 | /* Use baud rate calculations based on detected PCI |
1057 | * bus speed. Simply test whether the PCI clock is | |
1058 | * running closer to 66MHz or 33MHz. | |
1059 | */ | |
1060 | if (idd->count_period/IOC4_EXTINT_COUNT_DIVISOR < 20) { | |
1061 | port->ip_pci_bus_speed = IOC4_SER_XIN_CLK_66; | |
1062 | } else { | |
1063 | port->ip_pci_bus_speed = IOC4_SER_XIN_CLK_33; | |
1064 | } | |
1da177e4 LT |
1065 | port->ip_baud = 9600; |
1066 | port->ip_control = control; | |
22329b51 | 1067 | port->ip_mem = ioc4_misc; |
1da177e4 LT |
1068 | port->ip_serial = ioc4_serial; |
1069 | ||
1070 | /* point to the right hook */ | |
1071 | port->ip_hooks = &hooks_array[port_number]; | |
1072 | ||
1073 | /* Get direct hooks to the serial regs and uart regs | |
1074 | * for this port | |
1075 | */ | |
1076 | switch (port_number) { | |
1077 | case 0: | |
1078 | port->ip_serial_regs = &(port->ip_serial->port_0); | |
1079 | port->ip_uart_regs = &(port->ip_serial->uart_0); | |
1080 | break; | |
1081 | case 1: | |
1082 | port->ip_serial_regs = &(port->ip_serial->port_1); | |
1083 | port->ip_uart_regs = &(port->ip_serial->uart_1); | |
1084 | break; | |
1085 | case 2: | |
1086 | port->ip_serial_regs = &(port->ip_serial->port_2); | |
1087 | port->ip_uart_regs = &(port->ip_serial->uart_2); | |
1088 | break; | |
1089 | default: | |
1090 | case 3: | |
1091 | port->ip_serial_regs = &(port->ip_serial->port_3); | |
1092 | port->ip_uart_regs = &(port->ip_serial->uart_3); | |
1093 | break; | |
1094 | } | |
1095 | ||
1096 | /* ring buffers are 1 to a pair of ports */ | |
1097 | if (port_number && (port_number & 1)) { | |
1098 | /* odd use the evens buffer */ | |
1099 | port->ip_dma_ringbuf = | |
1100 | ports[port_number - 1]->ip_dma_ringbuf; | |
1101 | port->ip_cpu_ringbuf = | |
1102 | ports[port_number - 1]->ip_cpu_ringbuf; | |
1103 | port->ip_inring = RING(port, RX_1_OR_3); | |
1104 | port->ip_outring = RING(port, TX_1_OR_3); | |
1105 | ||
1106 | } else { | |
1107 | if (port->ip_dma_ringbuf == 0) { | |
1108 | port->ip_cpu_ringbuf = pci_alloc_consistent | |
1109 | (pdev, TOTAL_RING_BUF_SIZE, | |
1110 | &port->ip_dma_ringbuf); | |
1111 | ||
1112 | } | |
1113 | BUG_ON(!((((int64_t)port->ip_dma_ringbuf) & | |
1114 | (TOTAL_RING_BUF_SIZE - 1)) == 0)); | |
1115 | DPRINT_CONFIG(("%s : ip_cpu_ringbuf 0x%p " | |
1116 | "ip_dma_ringbuf 0x%p\n", | |
1117 | __FUNCTION__, | |
1118 | (void *)port->ip_cpu_ringbuf, | |
1119 | (void *)port->ip_dma_ringbuf)); | |
1120 | port->ip_inring = RING(port, RX_0_OR_2); | |
1121 | port->ip_outring = RING(port, TX_0_OR_2); | |
1122 | } | |
1123 | DPRINT_CONFIG(("%s : port %d [addr 0x%p] control 0x%p", | |
1124 | __FUNCTION__, | |
1125 | port_number, (void *)port, (void *)control)); | |
1126 | DPRINT_CONFIG((" ip_serial_regs 0x%p ip_uart_regs 0x%p\n", | |
1127 | (void *)port->ip_serial_regs, | |
1128 | (void *)port->ip_uart_regs)); | |
1129 | ||
1130 | /* Initialize the hardware for IOC4 */ | |
1131 | port_init(port); | |
1132 | ||
1133 | DPRINT_CONFIG(("%s: port_number %d port 0x%p inring 0x%p " | |
1134 | "outring 0x%p\n", | |
1135 | __FUNCTION__, | |
1136 | port_number, (void *)port, | |
1137 | (void *)port->ip_inring, | |
1138 | (void *)port->ip_outring)); | |
1139 | ||
1140 | /* Attach interrupt handlers */ | |
1141 | intr_connect(soft, IOC4_SIO_INTR_TYPE, | |
1142 | GET_SIO_IR(port_number), | |
1143 | handle_intr, port); | |
1144 | ||
1145 | intr_connect(soft, IOC4_OTHER_INTR_TYPE, | |
1146 | GET_OTHER_IR(port_number), | |
1147 | handle_dma_error_intr, port); | |
1148 | } | |
1149 | return 0; | |
1150 | } | |
1151 | ||
1152 | /** | |
1153 | * enable_intrs - enable interrupts | |
1154 | * @port: port to enable | |
1155 | * @mask: mask to use | |
1156 | */ | |
1157 | static void enable_intrs(struct ioc4_port *port, uint32_t mask) | |
1158 | { | |
1159 | struct hooks *hooks = port->ip_hooks; | |
1160 | ||
1161 | if ((port->ip_ienb & mask) != mask) { | |
1162 | write_ireg(port->ip_ioc4_soft, mask, IOC4_W_IES, | |
1163 | IOC4_SIO_INTR_TYPE); | |
1164 | port->ip_ienb |= mask; | |
1165 | } | |
1166 | ||
1167 | if (port->ip_ienb) | |
1168 | write_ireg(port->ip_ioc4_soft, hooks->intr_dma_error, | |
1169 | IOC4_W_IES, IOC4_OTHER_INTR_TYPE); | |
1170 | } | |
1171 | ||
1172 | /** | |
1173 | * local_open - local open a port | |
1174 | * @port: port to open | |
1175 | */ | |
1176 | static inline int local_open(struct ioc4_port *port) | |
1177 | { | |
1178 | int spiniter = 0; | |
1179 | ||
1180 | port->ip_flags = 0; | |
1181 | ||
1182 | /* Pause the DMA interface if necessary */ | |
1183 | if (port->ip_sscr & IOC4_SSCR_DMA_EN) { | |
1184 | writel(port->ip_sscr | IOC4_SSCR_DMA_PAUSE, | |
1185 | &port->ip_serial_regs->sscr); | |
1186 | while((readl(&port->ip_serial_regs-> sscr) | |
1187 | & IOC4_SSCR_PAUSE_STATE) == 0) { | |
1188 | spiniter++; | |
1189 | if (spiniter > MAXITER) { | |
1190 | return -1; | |
1191 | } | |
1192 | } | |
1193 | } | |
1194 | ||
1195 | /* Reset the input fifo. If the uart received chars while the port | |
1196 | * was closed and DMA is not enabled, the uart may have a bunch of | |
1197 | * chars hanging around in its rx fifo which will not be discarded | |
1198 | * by rclr in the upper layer. We must get rid of them here. | |
1199 | */ | |
1200 | writeb(UART_FCR_ENABLE_FIFO | UART_FCR_CLEAR_RCVR, | |
1201 | &port->ip_uart_regs->i4u_fcr); | |
1202 | ||
1203 | writeb(UART_LCR_WLEN8, &port->ip_uart_regs->i4u_lcr); | |
1204 | /* UART_LCR_STOP == 1 stop */ | |
1205 | ||
1206 | /* Re-enable DMA, set default threshold to intr whenever there is | |
1207 | * data available. | |
1208 | */ | |
1209 | port->ip_sscr &= ~IOC4_SSCR_RX_THRESHOLD; | |
1210 | port->ip_sscr |= 1; /* default threshold */ | |
1211 | ||
1212 | /* Plug in the new sscr. This implicitly clears the DMA_PAUSE | |
1213 | * flag if it was set above | |
1214 | */ | |
1215 | writel(port->ip_sscr, &port->ip_serial_regs->sscr); | |
1216 | port->ip_tx_lowat = 1; | |
1217 | return 0; | |
1218 | } | |
1219 | ||
1220 | /** | |
1221 | * set_rx_timeout - Set rx timeout and threshold values. | |
1222 | * @port: port to use | |
1223 | * @timeout: timeout value in ticks | |
1224 | */ | |
1225 | static inline int set_rx_timeout(struct ioc4_port *port, int timeout) | |
1226 | { | |
1227 | int threshold; | |
1228 | ||
1229 | port->ip_rx_timeout = timeout; | |
1230 | ||
1231 | /* Timeout is in ticks. Let's figure out how many chars we | |
1232 | * can receive at the current baud rate in that interval | |
1233 | * and set the rx threshold to that amount. There are 4 chars | |
1234 | * per ring entry, so we'll divide the number of chars that will | |
1235 | * arrive in timeout by 4. | |
6cb2875f | 1236 | * So .... timeout * baud / 10 / HZ / 4, with HZ = 100. |
1da177e4 | 1237 | */ |
6cb2875f | 1238 | threshold = timeout * port->ip_baud / 4000; |
1da177e4 LT |
1239 | if (threshold == 0) |
1240 | threshold = 1; /* otherwise we'll intr all the time! */ | |
1241 | ||
1242 | if ((unsigned)threshold > (unsigned)IOC4_SSCR_RX_THRESHOLD) | |
1243 | return 1; | |
1244 | ||
1245 | port->ip_sscr &= ~IOC4_SSCR_RX_THRESHOLD; | |
1246 | port->ip_sscr |= threshold; | |
1247 | ||
1248 | writel(port->ip_sscr, &port->ip_serial_regs->sscr); | |
1249 | ||
6cb2875f PG |
1250 | /* Now set the rx timeout to the given value |
1251 | * again timeout * IOC4_SRTR_HZ / HZ | |
1252 | */ | |
1253 | timeout = timeout * IOC4_SRTR_HZ / 100; | |
1da177e4 LT |
1254 | if (timeout > IOC4_SRTR_CNT) |
1255 | timeout = IOC4_SRTR_CNT; | |
1256 | ||
1257 | writel(timeout, &port->ip_serial_regs->srtr); | |
1258 | return 0; | |
1259 | } | |
1260 | ||
1261 | /** | |
1262 | * config_port - config the hardware | |
1263 | * @port: port to config | |
1264 | * @baud: baud rate for the port | |
1265 | * @byte_size: data size | |
1266 | * @stop_bits: number of stop bits | |
1267 | * @parenb: parity enable ? | |
1268 | * @parodd: odd parity ? | |
1269 | */ | |
1270 | static inline int | |
1271 | config_port(struct ioc4_port *port, | |
1272 | int baud, int byte_size, int stop_bits, int parenb, int parodd) | |
1273 | { | |
1274 | char lcr, sizebits; | |
1275 | int spiniter = 0; | |
1276 | ||
1277 | DPRINT_CONFIG(("%s: baud %d byte_size %d stop %d parenb %d parodd %d\n", | |
1278 | __FUNCTION__, baud, byte_size, stop_bits, parenb, parodd)); | |
1279 | ||
1280 | if (set_baud(port, baud)) | |
1281 | return 1; | |
1282 | ||
1283 | switch (byte_size) { | |
1284 | case 5: | |
1285 | sizebits = UART_LCR_WLEN5; | |
1286 | break; | |
1287 | case 6: | |
1288 | sizebits = UART_LCR_WLEN6; | |
1289 | break; | |
1290 | case 7: | |
1291 | sizebits = UART_LCR_WLEN7; | |
1292 | break; | |
1293 | case 8: | |
1294 | sizebits = UART_LCR_WLEN8; | |
1295 | break; | |
1296 | default: | |
1297 | return 1; | |
1298 | } | |
1299 | ||
1300 | /* Pause the DMA interface if necessary */ | |
1301 | if (port->ip_sscr & IOC4_SSCR_DMA_EN) { | |
1302 | writel(port->ip_sscr | IOC4_SSCR_DMA_PAUSE, | |
1303 | &port->ip_serial_regs->sscr); | |
1304 | while((readl(&port->ip_serial_regs->sscr) | |
1305 | & IOC4_SSCR_PAUSE_STATE) == 0) { | |
1306 | spiniter++; | |
1307 | if (spiniter > MAXITER) | |
1308 | return -1; | |
1309 | } | |
1310 | } | |
1311 | ||
1312 | /* Clear relevant fields in lcr */ | |
1313 | lcr = readb(&port->ip_uart_regs->i4u_lcr); | |
1314 | lcr &= ~(LCR_MASK_BITS_CHAR | UART_LCR_EPAR | | |
1315 | UART_LCR_PARITY | LCR_MASK_STOP_BITS); | |
1316 | ||
1317 | /* Set byte size in lcr */ | |
1318 | lcr |= sizebits; | |
1319 | ||
1320 | /* Set parity */ | |
1321 | if (parenb) { | |
1322 | lcr |= UART_LCR_PARITY; | |
1323 | if (!parodd) | |
1324 | lcr |= UART_LCR_EPAR; | |
1325 | } | |
1326 | ||
1327 | /* Set stop bits */ | |
1328 | if (stop_bits) | |
1329 | lcr |= UART_LCR_STOP /* 2 stop bits */ ; | |
1330 | ||
1331 | writeb(lcr, &port->ip_uart_regs->i4u_lcr); | |
1332 | ||
1333 | /* Re-enable the DMA interface if necessary */ | |
1334 | if (port->ip_sscr & IOC4_SSCR_DMA_EN) { | |
1335 | writel(port->ip_sscr, &port->ip_serial_regs->sscr); | |
1336 | } | |
1337 | port->ip_baud = baud; | |
1338 | ||
1339 | /* When we get within this number of ring entries of filling the | |
1340 | * entire ring on tx, place an EXPLICIT intr to generate a lowat | |
1341 | * notification when output has drained. | |
1342 | */ | |
1343 | port->ip_tx_lowat = (TX_LOWAT_CHARS(baud) + 3) / 4; | |
1344 | if (port->ip_tx_lowat == 0) | |
1345 | port->ip_tx_lowat = 1; | |
1346 | ||
6cb2875f | 1347 | set_rx_timeout(port, 2); |
1da177e4 LT |
1348 | |
1349 | return 0; | |
1350 | } | |
1351 | ||
1352 | /** | |
1353 | * do_write - Write bytes to the port. Returns the number of bytes | |
1354 | * actually written. Called from transmit_chars | |
1355 | * @port: port to use | |
1356 | * @buf: the stuff to write | |
1357 | * @len: how many bytes in 'buf' | |
1358 | */ | |
1359 | static inline int do_write(struct ioc4_port *port, char *buf, int len) | |
1360 | { | |
1361 | int prod_ptr, cons_ptr, total = 0; | |
1362 | struct ring *outring; | |
1363 | struct ring_entry *entry; | |
1364 | struct hooks *hooks = port->ip_hooks; | |
1365 | ||
1366 | BUG_ON(!(len >= 0)); | |
1367 | ||
1368 | prod_ptr = port->ip_tx_prod; | |
1369 | cons_ptr = readl(&port->ip_serial_regs->stcir) & PROD_CONS_MASK; | |
1370 | outring = port->ip_outring; | |
1371 | ||
1372 | /* Maintain a 1-entry red-zone. The ring buffer is full when | |
1373 | * (cons - prod) % ring_size is 1. Rather than do this subtraction | |
1374 | * in the body of the loop, I'll do it now. | |
1375 | */ | |
1376 | cons_ptr = (cons_ptr - (int)sizeof(struct ring_entry)) & PROD_CONS_MASK; | |
1377 | ||
1378 | /* Stuff the bytes into the output */ | |
1379 | while ((prod_ptr != cons_ptr) && (len > 0)) { | |
1380 | int xx; | |
1381 | ||
1382 | /* Get 4 bytes (one ring entry) at a time */ | |
1383 | entry = (struct ring_entry *)((caddr_t) outring + prod_ptr); | |
1384 | ||
1385 | /* Invalidate all entries */ | |
1386 | entry->ring_allsc = 0; | |
1387 | ||
1388 | /* Copy in some bytes */ | |
1389 | for (xx = 0; (xx < 4) && (len > 0); xx++) { | |
1390 | entry->ring_data[xx] = *buf++; | |
1391 | entry->ring_sc[xx] = IOC4_TXCB_VALID; | |
1392 | len--; | |
1393 | total++; | |
1394 | } | |
1395 | ||
1396 | /* If we are within some small threshold of filling up the | |
1397 | * entire ring buffer, we must place an EXPLICIT intr here | |
1398 | * to generate a lowat interrupt in case we subsequently | |
1399 | * really do fill up the ring and the caller goes to sleep. | |
1400 | * No need to place more than one though. | |
1401 | */ | |
1402 | if (!(port->ip_flags & LOWAT_WRITTEN) && | |
1403 | ((cons_ptr - prod_ptr) & PROD_CONS_MASK) | |
1404 | <= port->ip_tx_lowat | |
1405 | * (int)sizeof(struct ring_entry)) { | |
1406 | port->ip_flags |= LOWAT_WRITTEN; | |
1407 | entry->ring_sc[0] |= IOC4_TXCB_INT_WHEN_DONE; | |
1408 | } | |
1409 | ||
1410 | /* Go on to next entry */ | |
1411 | prod_ptr += sizeof(struct ring_entry); | |
1412 | prod_ptr &= PROD_CONS_MASK; | |
1413 | } | |
1414 | ||
1415 | /* If we sent something, start DMA if necessary */ | |
1416 | if (total > 0 && !(port->ip_sscr & IOC4_SSCR_DMA_EN)) { | |
1417 | port->ip_sscr |= IOC4_SSCR_DMA_EN; | |
1418 | writel(port->ip_sscr, &port->ip_serial_regs->sscr); | |
1419 | } | |
1420 | ||
1421 | /* Store the new producer pointer. If tx is disabled, we stuff the | |
1422 | * data into the ring buffer, but we don't actually start tx. | |
1423 | */ | |
1424 | if (!uart_tx_stopped(port->ip_port)) { | |
1425 | writel(prod_ptr, &port->ip_serial_regs->stpir); | |
1426 | ||
1427 | /* If we are now transmitting, enable tx_mt interrupt so we | |
1428 | * can disable DMA if necessary when the tx finishes. | |
1429 | */ | |
1430 | if (total > 0) | |
1431 | enable_intrs(port, hooks->intr_tx_mt); | |
1432 | } | |
1433 | port->ip_tx_prod = prod_ptr; | |
1434 | return total; | |
1435 | } | |
1436 | ||
1437 | /** | |
1438 | * disable_intrs - disable interrupts | |
1439 | * @port: port to enable | |
1440 | * @mask: mask to use | |
1441 | */ | |
1442 | static void disable_intrs(struct ioc4_port *port, uint32_t mask) | |
1443 | { | |
1444 | struct hooks *hooks = port->ip_hooks; | |
1445 | ||
1446 | if (port->ip_ienb & mask) { | |
1447 | write_ireg(port->ip_ioc4_soft, mask, IOC4_W_IEC, | |
1448 | IOC4_SIO_INTR_TYPE); | |
1449 | port->ip_ienb &= ~mask; | |
1450 | } | |
1451 | ||
1452 | if (!port->ip_ienb) | |
1453 | write_ireg(port->ip_ioc4_soft, hooks->intr_dma_error, | |
1454 | IOC4_W_IEC, IOC4_OTHER_INTR_TYPE); | |
1455 | } | |
1456 | ||
1457 | /** | |
1458 | * set_notification - Modify event notification | |
1459 | * @port: port to use | |
1460 | * @mask: events mask | |
1461 | * @set_on: set ? | |
1462 | */ | |
1463 | static int set_notification(struct ioc4_port *port, int mask, int set_on) | |
1464 | { | |
1465 | struct hooks *hooks = port->ip_hooks; | |
1466 | uint32_t intrbits, sscrbits; | |
1467 | ||
1468 | BUG_ON(!mask); | |
1469 | ||
1470 | intrbits = sscrbits = 0; | |
1471 | ||
1472 | if (mask & N_DATA_READY) | |
1473 | intrbits |= (hooks->intr_rx_timer | hooks->intr_rx_high); | |
1474 | if (mask & N_OUTPUT_LOWAT) | |
1475 | intrbits |= hooks->intr_tx_explicit; | |
1476 | if (mask & N_DDCD) { | |
1477 | intrbits |= hooks->intr_delta_dcd; | |
1478 | sscrbits |= IOC4_SSCR_RX_RING_DCD; | |
1479 | } | |
1480 | if (mask & N_DCTS) | |
1481 | intrbits |= hooks->intr_delta_cts; | |
1482 | ||
1483 | if (set_on) { | |
1484 | enable_intrs(port, intrbits); | |
1485 | port->ip_notify |= mask; | |
1486 | port->ip_sscr |= sscrbits; | |
1487 | } else { | |
1488 | disable_intrs(port, intrbits); | |
1489 | port->ip_notify &= ~mask; | |
1490 | port->ip_sscr &= ~sscrbits; | |
1491 | } | |
1492 | ||
1493 | /* We require DMA if either DATA_READY or DDCD notification is | |
1494 | * currently requested. If neither of these is requested and | |
1495 | * there is currently no tx in progress, DMA may be disabled. | |
1496 | */ | |
1497 | if (port->ip_notify & (N_DATA_READY | N_DDCD)) | |
1498 | port->ip_sscr |= IOC4_SSCR_DMA_EN; | |
1499 | else if (!(port->ip_ienb & hooks->intr_tx_mt)) | |
1500 | port->ip_sscr &= ~IOC4_SSCR_DMA_EN; | |
1501 | ||
1502 | writel(port->ip_sscr, &port->ip_serial_regs->sscr); | |
1503 | return 0; | |
1504 | } | |
1505 | ||
1506 | /** | |
1507 | * set_mcr - set the master control reg | |
1508 | * @the_port: port to use | |
1509 | * @set: set ? | |
1510 | * @mask1: mcr mask | |
1511 | * @mask2: shadow mask | |
1512 | */ | |
1513 | static inline int set_mcr(struct uart_port *the_port, int set, | |
1514 | int mask1, int mask2) | |
1515 | { | |
1516 | struct ioc4_port *port = get_ioc4_port(the_port); | |
1517 | uint32_t shadow; | |
1518 | int spiniter = 0; | |
1519 | char mcr; | |
1520 | ||
1521 | if (!port) | |
1522 | return -1; | |
1523 | ||
1524 | /* Pause the DMA interface if necessary */ | |
1525 | if (port->ip_sscr & IOC4_SSCR_DMA_EN) { | |
1526 | writel(port->ip_sscr | IOC4_SSCR_DMA_PAUSE, | |
1527 | &port->ip_serial_regs->sscr); | |
1528 | while ((readl(&port->ip_serial_regs->sscr) | |
1529 | & IOC4_SSCR_PAUSE_STATE) == 0) { | |
1530 | spiniter++; | |
1531 | if (spiniter > MAXITER) | |
1532 | return -1; | |
1533 | } | |
1534 | } | |
1535 | shadow = readl(&port->ip_serial_regs->shadow); | |
1536 | mcr = (shadow & 0xff000000) >> 24; | |
1537 | ||
1538 | /* Set new value */ | |
1539 | if (set) { | |
1540 | mcr |= mask1; | |
1541 | shadow |= mask2; | |
1542 | } else { | |
1543 | mcr &= ~mask1; | |
1544 | shadow &= ~mask2; | |
1545 | } | |
1546 | writeb(mcr, &port->ip_uart_regs->i4u_mcr); | |
1547 | writel(shadow, &port->ip_serial_regs->shadow); | |
1548 | ||
1549 | /* Re-enable the DMA interface if necessary */ | |
1550 | if (port->ip_sscr & IOC4_SSCR_DMA_EN) { | |
1551 | writel(port->ip_sscr, &port->ip_serial_regs->sscr); | |
1552 | } | |
1553 | return 0; | |
1554 | } | |
1555 | ||
1556 | /** | |
1557 | * ioc4_set_proto - set the protocol for the port | |
1558 | * @port: port to use | |
1559 | * @proto: protocol to use | |
1560 | */ | |
1561 | static int ioc4_set_proto(struct ioc4_port *port, enum sio_proto proto) | |
1562 | { | |
1563 | struct hooks *hooks = port->ip_hooks; | |
1564 | ||
1565 | switch (proto) { | |
1566 | case PROTO_RS232: | |
1567 | /* Clear the appropriate GIO pin */ | |
22329b51 | 1568 | writel(0, (&port->ip_mem->gppr[hooks->rs422_select_pin].raw)); |
1da177e4 LT |
1569 | break; |
1570 | ||
1571 | case PROTO_RS422: | |
1572 | /* Set the appropriate GIO pin */ | |
22329b51 | 1573 | writel(1, (&port->ip_mem->gppr[hooks->rs422_select_pin].raw)); |
1da177e4 LT |
1574 | break; |
1575 | ||
1576 | default: | |
1577 | return 1; | |
1578 | } | |
1579 | return 0; | |
1580 | } | |
1581 | ||
1582 | /** | |
1583 | * transmit_chars - upper level write, called with ip_lock | |
1584 | * @the_port: port to write | |
1585 | */ | |
1586 | static void transmit_chars(struct uart_port *the_port) | |
1587 | { | |
1588 | int xmit_count, tail, head; | |
1589 | int result; | |
1590 | char *start; | |
1591 | struct tty_struct *tty; | |
1592 | struct ioc4_port *port = get_ioc4_port(the_port); | |
1593 | struct uart_info *info; | |
1594 | ||
1595 | if (!the_port) | |
1596 | return; | |
1597 | if (!port) | |
1598 | return; | |
1599 | ||
1600 | info = the_port->info; | |
1601 | tty = info->tty; | |
1602 | ||
1603 | if (uart_circ_empty(&info->xmit) || uart_tx_stopped(the_port)) { | |
1604 | /* Nothing to do or hw stopped */ | |
1605 | set_notification(port, N_ALL_OUTPUT, 0); | |
1606 | return; | |
1607 | } | |
1608 | ||
1609 | head = info->xmit.head; | |
1610 | tail = info->xmit.tail; | |
1611 | start = (char *)&info->xmit.buf[tail]; | |
1612 | ||
1613 | /* write out all the data or until the end of the buffer */ | |
1614 | xmit_count = (head < tail) ? (UART_XMIT_SIZE - tail) : (head - tail); | |
1615 | if (xmit_count > 0) { | |
1616 | result = do_write(port, start, xmit_count); | |
1617 | if (result > 0) { | |
1618 | /* booking */ | |
1619 | xmit_count -= result; | |
1620 | the_port->icount.tx += result; | |
1621 | /* advance the pointers */ | |
1622 | tail += result; | |
1623 | tail &= UART_XMIT_SIZE - 1; | |
1624 | info->xmit.tail = tail; | |
1625 | start = (char *)&info->xmit.buf[tail]; | |
1626 | } | |
1627 | } | |
1628 | if (uart_circ_chars_pending(&info->xmit) < WAKEUP_CHARS) | |
1629 | uart_write_wakeup(the_port); | |
1630 | ||
1631 | if (uart_circ_empty(&info->xmit)) { | |
1632 | set_notification(port, N_OUTPUT_LOWAT, 0); | |
1633 | } else { | |
1634 | set_notification(port, N_OUTPUT_LOWAT, 1); | |
1635 | } | |
1636 | } | |
1637 | ||
1638 | /** | |
1639 | * ioc4_change_speed - change the speed of the port | |
1640 | * @the_port: port to change | |
1641 | * @new_termios: new termios settings | |
1642 | * @old_termios: old termios settings | |
1643 | */ | |
1644 | static void | |
1645 | ioc4_change_speed(struct uart_port *the_port, | |
1646 | struct termios *new_termios, struct termios *old_termios) | |
1647 | { | |
1648 | struct ioc4_port *port = get_ioc4_port(the_port); | |
1649 | int baud, bits; | |
68985e48 PG |
1650 | unsigned cflag; |
1651 | int new_parity = 0, new_parity_enable = 0, new_stop = 0, new_data = 8; | |
1da177e4 LT |
1652 | struct uart_info *info = the_port->info; |
1653 | ||
1654 | cflag = new_termios->c_cflag; | |
1655 | ||
1656 | switch (cflag & CSIZE) { | |
1657 | case CS5: | |
1658 | new_data = 5; | |
1da177e4 LT |
1659 | bits = 7; |
1660 | break; | |
1661 | case CS6: | |
1662 | new_data = 6; | |
1da177e4 LT |
1663 | bits = 8; |
1664 | break; | |
1665 | case CS7: | |
1666 | new_data = 7; | |
1da177e4 LT |
1667 | bits = 9; |
1668 | break; | |
1669 | case CS8: | |
1670 | new_data = 8; | |
1da177e4 LT |
1671 | bits = 10; |
1672 | break; | |
1673 | default: | |
1674 | /* cuz we always need a default ... */ | |
1675 | new_data = 5; | |
1da177e4 LT |
1676 | bits = 7; |
1677 | break; | |
1678 | } | |
1679 | if (cflag & CSTOPB) { | |
1da177e4 LT |
1680 | bits++; |
1681 | new_stop = 1; | |
1682 | } | |
1683 | if (cflag & PARENB) { | |
1da177e4 LT |
1684 | bits++; |
1685 | new_parity_enable = 1; | |
68985e48 PG |
1686 | if (cflag & PARODD) |
1687 | new_parity = 1; | |
1da177e4 LT |
1688 | } |
1689 | baud = uart_get_baud_rate(the_port, new_termios, old_termios, | |
1690 | MIN_BAUD_SUPPORTED, MAX_BAUD_SUPPORTED); | |
1691 | DPRINT_CONFIG(("%s: returned baud %d\n", __FUNCTION__, baud)); | |
1692 | ||
1693 | /* default is 9600 */ | |
1694 | if (!baud) | |
1695 | baud = 9600; | |
1696 | ||
1697 | if (!the_port->fifosize) | |
396dc44b | 1698 | the_port->fifosize = IOC4_FIFO_CHARS; |
1da177e4 LT |
1699 | the_port->timeout = ((the_port->fifosize * HZ * bits) / (baud / 10)); |
1700 | the_port->timeout += HZ / 50; /* Add .02 seconds of slop */ | |
1701 | ||
1702 | the_port->ignore_status_mask = N_ALL_INPUT; | |
1703 | ||
396dc44b PG |
1704 | info->tty->low_latency = 1; |
1705 | ||
1da177e4 LT |
1706 | if (I_IGNPAR(info->tty)) |
1707 | the_port->ignore_status_mask &= ~(N_PARITY_ERROR | |
1708 | | N_FRAMING_ERROR); | |
1709 | if (I_IGNBRK(info->tty)) { | |
1710 | the_port->ignore_status_mask &= ~N_BREAK; | |
1711 | if (I_IGNPAR(info->tty)) | |
1712 | the_port->ignore_status_mask &= ~N_OVERRUN_ERROR; | |
1713 | } | |
1714 | if (!(cflag & CREAD)) { | |
1715 | /* ignore everything */ | |
1716 | the_port->ignore_status_mask &= ~N_DATA_READY; | |
1717 | } | |
1718 | ||
149733d4 | 1719 | if (cflag & CRTSCTS) { |
1da177e4 | 1720 | info->flags |= ASYNC_CTS_FLOW; |
149733d4 | 1721 | port->ip_sscr |= IOC4_SSCR_HFC_EN; |
149733d4 | 1722 | } |
68985e48 | 1723 | else { |
1da177e4 | 1724 | info->flags &= ~ASYNC_CTS_FLOW; |
68985e48 PG |
1725 | port->ip_sscr &= ~IOC4_SSCR_HFC_EN; |
1726 | } | |
1727 | writel(port->ip_sscr, &port->ip_serial_regs->sscr); | |
1da177e4 LT |
1728 | |
1729 | /* Set the configuration and proper notification call */ | |
1730 | DPRINT_CONFIG(("%s : port 0x%p cflag 0%o " | |
1731 | "config_port(baud %d data %d stop %d p enable %d parity %d)," | |
1732 | " notification 0x%x\n", | |
1733 | __FUNCTION__, (void *)port, cflag, baud, new_data, new_stop, | |
1734 | new_parity_enable, new_parity, the_port->ignore_status_mask)); | |
1735 | ||
1736 | if ((config_port(port, baud, /* baud */ | |
1737 | new_data, /* byte size */ | |
1738 | new_stop, /* stop bits */ | |
1739 | new_parity_enable, /* set parity */ | |
1740 | new_parity)) >= 0) { /* parity 1==odd */ | |
1741 | set_notification(port, the_port->ignore_status_mask, 1); | |
1742 | } | |
1743 | } | |
1744 | ||
1745 | /** | |
1746 | * ic4_startup_local - Start up the serial port - returns >= 0 if no errors | |
1747 | * @the_port: Port to operate on | |
1748 | */ | |
1749 | static inline int ic4_startup_local(struct uart_port *the_port) | |
1750 | { | |
1da177e4 LT |
1751 | struct ioc4_port *port; |
1752 | struct uart_info *info; | |
1753 | ||
1754 | if (!the_port) | |
1755 | return -1; | |
1756 | ||
1757 | port = get_ioc4_port(the_port); | |
1758 | if (!port) | |
1759 | return -1; | |
1760 | ||
1761 | info = the_port->info; | |
1da177e4 LT |
1762 | |
1763 | if (info->tty) { | |
1764 | set_bit(TTY_IO_ERROR, &info->tty->flags); | |
1765 | clear_bit(TTY_IO_ERROR, &info->tty->flags); | |
1766 | if ((info->flags & ASYNC_SPD_MASK) == ASYNC_SPD_HI) | |
1767 | info->tty->alt_speed = 57600; | |
1768 | if ((info->flags & ASYNC_SPD_MASK) == ASYNC_SPD_VHI) | |
1769 | info->tty->alt_speed = 115200; | |
1770 | if ((info->flags & ASYNC_SPD_MASK) == ASYNC_SPD_SHI) | |
1771 | info->tty->alt_speed = 230400; | |
1772 | if ((info->flags & ASYNC_SPD_MASK) == ASYNC_SPD_WARP) | |
1773 | info->tty->alt_speed = 460800; | |
1774 | } | |
1775 | local_open(port); | |
1776 | ||
1777 | /* set the speed of the serial port */ | |
1778 | ioc4_change_speed(the_port, info->tty->termios, (struct termios *)0); | |
1779 | ||
1da177e4 LT |
1780 | return 0; |
1781 | } | |
1782 | ||
1783 | /* | |
1784 | * ioc4_cb_output_lowat - called when the output low water mark is hit | |
1785 | * @port: port to output | |
1786 | */ | |
1787 | static void ioc4_cb_output_lowat(struct ioc4_port *port) | |
1788 | { | |
396dc44b PG |
1789 | unsigned long pflags; |
1790 | ||
1da177e4 LT |
1791 | /* ip_lock is set on the call here */ |
1792 | if (port->ip_port) { | |
396dc44b | 1793 | spin_lock_irqsave(&port->ip_port->lock, pflags); |
1da177e4 | 1794 | transmit_chars(port->ip_port); |
396dc44b | 1795 | spin_unlock_irqrestore(&port->ip_port->lock, pflags); |
1da177e4 LT |
1796 | } |
1797 | } | |
1798 | ||
1da177e4 LT |
1799 | /** |
1800 | * handle_intr - service any interrupts for the given port - 2nd level | |
1801 | * called via sd_intr | |
1802 | * @arg: handler arg | |
1803 | * @sio_ir: ioc4regs | |
1804 | */ | |
1805 | static void handle_intr(void *arg, uint32_t sio_ir) | |
1806 | { | |
1807 | struct ioc4_port *port = (struct ioc4_port *)arg; | |
1808 | struct hooks *hooks = port->ip_hooks; | |
1809 | unsigned int rx_high_rd_aborted = 0; | |
1810 | unsigned int flags; | |
1811 | struct uart_port *the_port; | |
1812 | int loop_counter; | |
1813 | ||
1814 | /* Possible race condition here: The tx_mt interrupt bit may be | |
1815 | * cleared without the intervention of the interrupt handler, | |
1816 | * e.g. by a write. If the top level interrupt handler reads a | |
1817 | * tx_mt, then some other processor does a write, starting up | |
1818 | * output, then we come in here, see the tx_mt and stop DMA, the | |
1819 | * output started by the other processor will hang. Thus we can | |
1820 | * only rely on tx_mt being legitimate if it is read while the | |
1821 | * port lock is held. Therefore this bit must be ignored in the | |
1822 | * passed in interrupt mask which was read by the top level | |
1823 | * interrupt handler since the port lock was not held at the time | |
1824 | * it was read. We can only rely on this bit being accurate if it | |
1825 | * is read while the port lock is held. So we'll clear it for now, | |
1826 | * and reload it later once we have the port lock. | |
1827 | */ | |
1828 | sio_ir &= ~(hooks->intr_tx_mt); | |
1829 | ||
1830 | spin_lock_irqsave(&port->ip_lock, flags); | |
1831 | ||
1832 | loop_counter = MAXITER; /* to avoid hangs */ | |
1833 | ||
1834 | do { | |
1835 | uint32_t shadow; | |
1836 | ||
1837 | if ( loop_counter-- <= 0 ) { | |
1838 | printk(KERN_WARNING "IOC4 serial: " | |
1839 | "possible hang condition/" | |
1840 | "port stuck on interrupt.\n"); | |
1841 | break; | |
1842 | } | |
1843 | ||
1844 | /* Handle a DCD change */ | |
1845 | if (sio_ir & hooks->intr_delta_dcd) { | |
1846 | /* ACK the interrupt */ | |
1847 | writel(hooks->intr_delta_dcd, | |
22329b51 | 1848 | &port->ip_mem->sio_ir.raw); |
1da177e4 LT |
1849 | |
1850 | shadow = readl(&port->ip_serial_regs->shadow); | |
1851 | ||
1852 | if ((port->ip_notify & N_DDCD) | |
1853 | && (shadow & IOC4_SHADOW_DCD) | |
1854 | && (port->ip_port)) { | |
1855 | the_port = port->ip_port; | |
1856 | the_port->icount.dcd = 1; | |
1857 | wake_up_interruptible | |
1858 | (&the_port-> info->delta_msr_wait); | |
1859 | } else if ((port->ip_notify & N_DDCD) | |
1860 | && !(shadow & IOC4_SHADOW_DCD)) { | |
1861 | /* Flag delta DCD/no DCD */ | |
1862 | port->ip_flags |= DCD_ON; | |
1863 | } | |
1864 | } | |
1865 | ||
1866 | /* Handle a CTS change */ | |
1867 | if (sio_ir & hooks->intr_delta_cts) { | |
1868 | /* ACK the interrupt */ | |
1869 | writel(hooks->intr_delta_cts, | |
22329b51 | 1870 | &port->ip_mem->sio_ir.raw); |
1da177e4 LT |
1871 | |
1872 | shadow = readl(&port->ip_serial_regs->shadow); | |
1873 | ||
1874 | if ((port->ip_notify & N_DCTS) | |
1875 | && (port->ip_port)) { | |
1876 | the_port = port->ip_port; | |
1877 | the_port->icount.cts = | |
1878 | (shadow & IOC4_SHADOW_CTS) ? 1 : 0; | |
1879 | wake_up_interruptible | |
1880 | (&the_port->info->delta_msr_wait); | |
1881 | } | |
1882 | } | |
1883 | ||
1884 | /* rx timeout interrupt. Must be some data available. Put this | |
1885 | * before the check for rx_high since servicing this condition | |
1886 | * may cause that condition to clear. | |
1887 | */ | |
1888 | if (sio_ir & hooks->intr_rx_timer) { | |
1889 | /* ACK the interrupt */ | |
1890 | writel(hooks->intr_rx_timer, | |
22329b51 | 1891 | &port->ip_mem->sio_ir.raw); |
1da177e4 LT |
1892 | |
1893 | if ((port->ip_notify & N_DATA_READY) | |
1894 | && (port->ip_port)) { | |
1895 | /* ip_lock is set on call here */ | |
1896 | receive_chars(port->ip_port); | |
1897 | } | |
1898 | } | |
1899 | ||
1900 | /* rx high interrupt. Must be after rx_timer. */ | |
1901 | else if (sio_ir & hooks->intr_rx_high) { | |
1902 | /* Data available, notify upper layer */ | |
1903 | if ((port->ip_notify & N_DATA_READY) | |
1904 | && port->ip_port) { | |
1905 | /* ip_lock is set on call here */ | |
1906 | receive_chars(port->ip_port); | |
1907 | } | |
1908 | ||
1909 | /* We can't ACK this interrupt. If receive_chars didn't | |
1910 | * cause the condition to clear, we'll have to disable | |
1911 | * the interrupt until the data is drained. | |
1912 | * If the read was aborted, don't disable the interrupt | |
1913 | * as this may cause us to hang indefinitely. An | |
1914 | * aborted read generally means that this interrupt | |
1915 | * hasn't been delivered to the cpu yet anyway, even | |
1916 | * though we see it as asserted when we read the sio_ir. | |
1917 | */ | |
1918 | if ((sio_ir = PENDING(port)) & hooks->intr_rx_high) { | |
1919 | if ((port->ip_flags & READ_ABORTED) == 0) { | |
1920 | port->ip_ienb &= ~hooks->intr_rx_high; | |
1921 | port->ip_flags |= INPUT_HIGH; | |
1922 | } else { | |
1923 | rx_high_rd_aborted++; | |
1924 | } | |
1925 | } | |
1926 | } | |
1927 | ||
1928 | /* We got a low water interrupt: notify upper layer to | |
1929 | * send more data. Must come before tx_mt since servicing | |
1930 | * this condition may cause that condition to clear. | |
1931 | */ | |
1932 | if (sio_ir & hooks->intr_tx_explicit) { | |
1933 | port->ip_flags &= ~LOWAT_WRITTEN; | |
1934 | ||
1935 | /* ACK the interrupt */ | |
1936 | writel(hooks->intr_tx_explicit, | |
22329b51 | 1937 | &port->ip_mem->sio_ir.raw); |
1da177e4 LT |
1938 | |
1939 | if (port->ip_notify & N_OUTPUT_LOWAT) | |
1940 | ioc4_cb_output_lowat(port); | |
1941 | } | |
1942 | ||
1943 | /* Handle tx_mt. Must come after tx_explicit. */ | |
1944 | else if (sio_ir & hooks->intr_tx_mt) { | |
1945 | /* If we are expecting a lowat notification | |
1946 | * and we get to this point it probably means that for | |
1947 | * some reason the tx_explicit didn't work as expected | |
1948 | * (that can legitimately happen if the output buffer is | |
1949 | * filled up in just the right way). | |
1950 | * So send the notification now. | |
1951 | */ | |
1952 | if (port->ip_notify & N_OUTPUT_LOWAT) { | |
1953 | ioc4_cb_output_lowat(port); | |
1954 | ||
1955 | /* We need to reload the sio_ir since the lowat | |
1956 | * call may have caused another write to occur, | |
1957 | * clearing the tx_mt condition. | |
1958 | */ | |
1959 | sio_ir = PENDING(port); | |
1960 | } | |
1961 | ||
1962 | /* If the tx_mt condition still persists even after the | |
1963 | * lowat call, we've got some work to do. | |
1964 | */ | |
1965 | if (sio_ir & hooks->intr_tx_mt) { | |
1966 | ||
1967 | /* If we are not currently expecting DMA input, | |
1968 | * and the transmitter has just gone idle, | |
1969 | * there is no longer any reason for DMA, so | |
1970 | * disable it. | |
1971 | */ | |
1972 | if (!(port->ip_notify | |
1973 | & (N_DATA_READY | N_DDCD))) { | |
1974 | BUG_ON(!(port->ip_sscr | |
1975 | & IOC4_SSCR_DMA_EN)); | |
1976 | port->ip_sscr &= ~IOC4_SSCR_DMA_EN; | |
1977 | writel(port->ip_sscr, | |
1978 | &port->ip_serial_regs->sscr); | |
1979 | } | |
1980 | ||
1981 | /* Prevent infinite tx_mt interrupt */ | |
1982 | port->ip_ienb &= ~hooks->intr_tx_mt; | |
1983 | } | |
1984 | } | |
1985 | sio_ir = PENDING(port); | |
1986 | ||
1987 | /* if the read was aborted and only hooks->intr_rx_high, | |
1988 | * clear hooks->intr_rx_high, so we do not loop forever. | |
1989 | */ | |
1990 | ||
1991 | if (rx_high_rd_aborted && (sio_ir == hooks->intr_rx_high)) { | |
1992 | sio_ir &= ~hooks->intr_rx_high; | |
1993 | } | |
1994 | } while (sio_ir & hooks->intr_all); | |
1995 | ||
1996 | spin_unlock_irqrestore(&port->ip_lock, flags); | |
1997 | ||
1998 | /* Re-enable interrupts before returning from interrupt handler. | |
1999 | * Getting interrupted here is okay. It'll just v() our semaphore, and | |
2000 | * we'll come through the loop again. | |
2001 | */ | |
2002 | ||
2003 | write_ireg(port->ip_ioc4_soft, port->ip_ienb, IOC4_W_IES, | |
2004 | IOC4_SIO_INTR_TYPE); | |
2005 | } | |
2006 | ||
2007 | /* | |
2008 | * ioc4_cb_post_ncs - called for some basic errors | |
2009 | * @port: port to use | |
2010 | * @ncs: event | |
2011 | */ | |
2012 | static void ioc4_cb_post_ncs(struct uart_port *the_port, int ncs) | |
2013 | { | |
2014 | struct uart_icount *icount; | |
2015 | ||
2016 | icount = &the_port->icount; | |
2017 | ||
2018 | if (ncs & NCS_BREAK) | |
2019 | icount->brk++; | |
2020 | if (ncs & NCS_FRAMING) | |
2021 | icount->frame++; | |
2022 | if (ncs & NCS_OVERRUN) | |
2023 | icount->overrun++; | |
2024 | if (ncs & NCS_PARITY) | |
2025 | icount->parity++; | |
2026 | } | |
2027 | ||
2028 | /** | |
2029 | * do_read - Read in bytes from the port. Return the number of bytes | |
2030 | * actually read. | |
2031 | * @the_port: port to use | |
2032 | * @buf: place to put the stuff we read | |
2033 | * @len: how big 'buf' is | |
2034 | */ | |
2035 | ||
2036 | static inline int do_read(struct uart_port *the_port, unsigned char *buf, | |
2037 | int len) | |
2038 | { | |
2039 | int prod_ptr, cons_ptr, total; | |
2040 | struct ioc4_port *port = get_ioc4_port(the_port); | |
2041 | struct ring *inring; | |
2042 | struct ring_entry *entry; | |
2043 | struct hooks *hooks = port->ip_hooks; | |
2044 | int byte_num; | |
2045 | char *sc; | |
2046 | int loop_counter; | |
2047 | ||
2048 | BUG_ON(!(len >= 0)); | |
2049 | BUG_ON(!port); | |
2050 | ||
2051 | /* There is a nasty timing issue in the IOC4. When the rx_timer | |
2052 | * expires or the rx_high condition arises, we take an interrupt. | |
2053 | * At some point while servicing the interrupt, we read bytes from | |
2054 | * the ring buffer and re-arm the rx_timer. However the rx_timer is | |
2055 | * not started until the first byte is received *after* it is armed, | |
2056 | * and any bytes pending in the rx construction buffers are not drained | |
2057 | * to memory until either there are 4 bytes available or the rx_timer | |
2058 | * expires. This leads to a potential situation where data is left | |
2059 | * in the construction buffers forever - 1 to 3 bytes were received | |
2060 | * after the interrupt was generated but before the rx_timer was | |
2061 | * re-armed. At that point as long as no subsequent bytes are received | |
2062 | * the timer will never be started and the bytes will remain in the | |
2063 | * construction buffer forever. The solution is to execute a DRAIN | |
2064 | * command after rearming the timer. This way any bytes received before | |
2065 | * the DRAIN will be drained to memory, and any bytes received after | |
2066 | * the DRAIN will start the TIMER and be drained when it expires. | |
2067 | * Luckily, this only needs to be done when the DMA buffer is empty | |
2068 | * since there is no requirement that this function return all | |
2069 | * available data as long as it returns some. | |
2070 | */ | |
2071 | /* Re-arm the timer */ | |
396dc44b | 2072 | writel(port->ip_rx_cons | IOC4_SRCIR_ARM, &port->ip_serial_regs->srcir); |
1da177e4 LT |
2073 | |
2074 | prod_ptr = readl(&port->ip_serial_regs->srpir) & PROD_CONS_MASK; | |
2075 | cons_ptr = port->ip_rx_cons; | |
2076 | ||
2077 | if (prod_ptr == cons_ptr) { | |
2078 | int reset_dma = 0; | |
2079 | ||
2080 | /* Input buffer appears empty, do a flush. */ | |
2081 | ||
2082 | /* DMA must be enabled for this to work. */ | |
2083 | if (!(port->ip_sscr & IOC4_SSCR_DMA_EN)) { | |
2084 | port->ip_sscr |= IOC4_SSCR_DMA_EN; | |
2085 | reset_dma = 1; | |
2086 | } | |
2087 | ||
2088 | /* Potential race condition: we must reload the srpir after | |
2089 | * issuing the drain command, otherwise we could think the rx | |
2090 | * buffer is empty, then take a very long interrupt, and when | |
2091 | * we come back it's full and we wait forever for the drain to | |
2092 | * complete. | |
2093 | */ | |
2094 | writel(port->ip_sscr | IOC4_SSCR_RX_DRAIN, | |
2095 | &port->ip_serial_regs->sscr); | |
2096 | prod_ptr = readl(&port->ip_serial_regs->srpir) | |
2097 | & PROD_CONS_MASK; | |
2098 | ||
2099 | /* We must not wait for the DRAIN to complete unless there are | |
2100 | * at least 8 bytes (2 ring entries) available to receive the | |
2101 | * data otherwise the DRAIN will never complete and we'll | |
2102 | * deadlock here. | |
2103 | * In fact, to make things easier, I'll just ignore the flush if | |
2104 | * there is any data at all now available. | |
2105 | */ | |
2106 | if (prod_ptr == cons_ptr) { | |
2107 | loop_counter = 0; | |
2108 | while (readl(&port->ip_serial_regs->sscr) & | |
2109 | IOC4_SSCR_RX_DRAIN) { | |
2110 | loop_counter++; | |
2111 | if (loop_counter > MAXITER) | |
2112 | return -1; | |
2113 | } | |
2114 | ||
2115 | /* SIGH. We have to reload the prod_ptr *again* since | |
2116 | * the drain may have caused it to change | |
2117 | */ | |
2118 | prod_ptr = readl(&port->ip_serial_regs->srpir) | |
2119 | & PROD_CONS_MASK; | |
2120 | } | |
2121 | if (reset_dma) { | |
2122 | port->ip_sscr &= ~IOC4_SSCR_DMA_EN; | |
2123 | writel(port->ip_sscr, &port->ip_serial_regs->sscr); | |
2124 | } | |
2125 | } | |
2126 | inring = port->ip_inring; | |
2127 | port->ip_flags &= ~READ_ABORTED; | |
2128 | ||
2129 | total = 0; | |
2130 | loop_counter = 0xfffff; /* to avoid hangs */ | |
2131 | ||
2132 | /* Grab bytes from the hardware */ | |
2133 | while ((prod_ptr != cons_ptr) && (len > 0)) { | |
2134 | entry = (struct ring_entry *)((caddr_t)inring + cons_ptr); | |
2135 | ||
2136 | if ( loop_counter-- <= 0 ) { | |
2137 | printk(KERN_WARNING "IOC4 serial: " | |
2138 | "possible hang condition/" | |
2139 | "port stuck on read.\n"); | |
2140 | break; | |
2141 | } | |
2142 | ||
2143 | /* According to the producer pointer, this ring entry | |
2144 | * must contain some data. But if the PIO happened faster | |
2145 | * than the DMA, the data may not be available yet, so let's | |
2146 | * wait until it arrives. | |
2147 | */ | |
2148 | if ((entry->ring_allsc & RING_ANY_VALID) == 0) { | |
2149 | /* Indicate the read is aborted so we don't disable | |
2150 | * the interrupt thinking that the consumer is | |
2151 | * congested. | |
2152 | */ | |
2153 | port->ip_flags |= READ_ABORTED; | |
2154 | len = 0; | |
2155 | break; | |
2156 | } | |
2157 | ||
2158 | /* Load the bytes/status out of the ring entry */ | |
2159 | for (byte_num = 0; byte_num < 4 && len > 0; byte_num++) { | |
2160 | sc = &(entry->ring_sc[byte_num]); | |
2161 | ||
2162 | /* Check for change in modem state or overrun */ | |
2163 | if ((*sc & IOC4_RXSB_MODEM_VALID) | |
2164 | && (port->ip_notify & N_DDCD)) { | |
2165 | /* Notify upper layer if DCD dropped */ | |
2166 | ||
2167 | if ((port->ip_flags & DCD_ON) | |
2168 | && !(*sc & IOC4_RXSB_DCD)) { | |
2169 | ||
2170 | /* If we have already copied some data, | |
2171 | * return it. We'll pick up the carrier | |
2172 | * drop on the next pass. That way we | |
2173 | * don't throw away the data that has | |
2174 | * already been copied back to | |
2175 | * the caller's buffer. | |
2176 | */ | |
2177 | if (total > 0) { | |
2178 | len = 0; | |
2179 | break; | |
2180 | } | |
2181 | port->ip_flags &= ~DCD_ON; | |
2182 | ||
2183 | /* Turn off this notification so the | |
2184 | * carrier drop protocol won't see it | |
2185 | * again when it does a read. | |
2186 | */ | |
2187 | *sc &= ~IOC4_RXSB_MODEM_VALID; | |
2188 | ||
2189 | /* To keep things consistent, we need | |
2190 | * to update the consumer pointer so | |
2191 | * the next reader won't come in and | |
2192 | * try to read the same ring entries | |
2193 | * again. This must be done here before | |
2194 | * the dcd change. | |
2195 | */ | |
2196 | ||
2197 | if ((entry->ring_allsc & RING_ANY_VALID) | |
2198 | == 0) { | |
2199 | cons_ptr += (int)sizeof | |
2200 | (struct ring_entry); | |
2201 | cons_ptr &= PROD_CONS_MASK; | |
2202 | } | |
2203 | writel(cons_ptr, | |
2204 | &port->ip_serial_regs->srcir); | |
2205 | port->ip_rx_cons = cons_ptr; | |
2206 | ||
2207 | /* Notify upper layer of carrier drop */ | |
2208 | if ((port->ip_notify & N_DDCD) | |
2209 | && port->ip_port) { | |
2210 | the_port->icount.dcd = 0; | |
2211 | wake_up_interruptible | |
2212 | (&the_port->info-> | |
2213 | delta_msr_wait); | |
2214 | } | |
2215 | ||
2216 | /* If we had any data to return, we | |
2217 | * would have returned it above. | |
2218 | */ | |
2219 | return 0; | |
2220 | } | |
2221 | } | |
2222 | if (*sc & IOC4_RXSB_MODEM_VALID) { | |
2223 | /* Notify that an input overrun occurred */ | |
2224 | if ((*sc & IOC4_RXSB_OVERRUN) | |
2225 | && (port->ip_notify & N_OVERRUN_ERROR)) { | |
2226 | ioc4_cb_post_ncs(the_port, NCS_OVERRUN); | |
2227 | } | |
2228 | /* Don't look at this byte again */ | |
2229 | *sc &= ~IOC4_RXSB_MODEM_VALID; | |
2230 | } | |
2231 | ||
2232 | /* Check for valid data or RX errors */ | |
2233 | if ((*sc & IOC4_RXSB_DATA_VALID) && | |
2234 | ((*sc & (IOC4_RXSB_PAR_ERR | |
2235 | | IOC4_RXSB_FRAME_ERR | |
2236 | | IOC4_RXSB_BREAK)) | |
2237 | && (port->ip_notify & (N_PARITY_ERROR | |
2238 | | N_FRAMING_ERROR | |
2239 | | N_BREAK)))) { | |
2240 | /* There is an error condition on the next byte. | |
2241 | * If we have already transferred some bytes, | |
2242 | * we'll stop here. Otherwise if this is the | |
2243 | * first byte to be read, we'll just transfer | |
2244 | * it alone after notifying the | |
2245 | * upper layer of its status. | |
2246 | */ | |
2247 | if (total > 0) { | |
2248 | len = 0; | |
2249 | break; | |
2250 | } else { | |
2251 | if ((*sc & IOC4_RXSB_PAR_ERR) && | |
2252 | (port->ip_notify & N_PARITY_ERROR)) { | |
2253 | ioc4_cb_post_ncs(the_port, | |
2254 | NCS_PARITY); | |
2255 | } | |
2256 | if ((*sc & IOC4_RXSB_FRAME_ERR) && | |
2257 | (port->ip_notify & N_FRAMING_ERROR)){ | |
2258 | ioc4_cb_post_ncs(the_port, | |
2259 | NCS_FRAMING); | |
2260 | } | |
2261 | if ((*sc & IOC4_RXSB_BREAK) | |
2262 | && (port->ip_notify & N_BREAK)) { | |
2263 | ioc4_cb_post_ncs | |
2264 | (the_port, | |
2265 | NCS_BREAK); | |
2266 | } | |
2267 | len = 1; | |
2268 | } | |
2269 | } | |
2270 | if (*sc & IOC4_RXSB_DATA_VALID) { | |
2271 | *sc &= ~IOC4_RXSB_DATA_VALID; | |
2272 | *buf = entry->ring_data[byte_num]; | |
2273 | buf++; | |
2274 | len--; | |
2275 | total++; | |
2276 | } | |
2277 | } | |
2278 | ||
2279 | /* If we used up this entry entirely, go on to the next one, | |
2280 | * otherwise we must have run out of buffer space, so | |
2281 | * leave the consumer pointer here for the next read in case | |
2282 | * there are still unread bytes in this entry. | |
2283 | */ | |
2284 | if ((entry->ring_allsc & RING_ANY_VALID) == 0) { | |
2285 | cons_ptr += (int)sizeof(struct ring_entry); | |
2286 | cons_ptr &= PROD_CONS_MASK; | |
2287 | } | |
2288 | } | |
2289 | ||
2290 | /* Update consumer pointer and re-arm rx timer interrupt */ | |
2291 | writel(cons_ptr, &port->ip_serial_regs->srcir); | |
2292 | port->ip_rx_cons = cons_ptr; | |
2293 | ||
2294 | /* If we have now dipped below the rx high water mark and we have | |
2295 | * rx_high interrupt turned off, we can now turn it back on again. | |
2296 | */ | |
2297 | if ((port->ip_flags & INPUT_HIGH) && (((prod_ptr - cons_ptr) | |
2298 | & PROD_CONS_MASK) < ((port->ip_sscr & | |
2299 | IOC4_SSCR_RX_THRESHOLD) | |
2300 | << IOC4_PROD_CONS_PTR_OFF))) { | |
2301 | port->ip_flags &= ~INPUT_HIGH; | |
2302 | enable_intrs(port, hooks->intr_rx_high); | |
2303 | } | |
2304 | return total; | |
2305 | } | |
396dc44b | 2306 | |
1da177e4 LT |
2307 | /** |
2308 | * receive_chars - upper level read. Called with ip_lock. | |
2309 | * @the_port: port to read from | |
2310 | */ | |
2311 | static void receive_chars(struct uart_port *the_port) | |
2312 | { | |
2313 | struct tty_struct *tty; | |
2314 | unsigned char ch[IOC4_MAX_CHARS]; | |
396dc44b | 2315 | int read_count, request_count = IOC4_MAX_CHARS; |
1da177e4 LT |
2316 | struct uart_icount *icount; |
2317 | struct uart_info *info = the_port->info; | |
396dc44b PG |
2318 | int flip = 0; |
2319 | unsigned long pflags; | |
1da177e4 LT |
2320 | |
2321 | /* Make sure all the pointers are "good" ones */ | |
2322 | if (!info) | |
2323 | return; | |
2324 | if (!info->tty) | |
2325 | return; | |
2326 | ||
396dc44b | 2327 | spin_lock_irqsave(&the_port->lock, pflags); |
1da177e4 LT |
2328 | tty = info->tty; |
2329 | ||
396dc44b PG |
2330 | if (request_count > TTY_FLIPBUF_SIZE - tty->flip.count) |
2331 | request_count = TTY_FLIPBUF_SIZE - tty->flip.count; | |
1da177e4 LT |
2332 | |
2333 | if (request_count > 0) { | |
1da177e4 LT |
2334 | icount = &the_port->icount; |
2335 | read_count = do_read(the_port, ch, request_count); | |
2336 | if (read_count > 0) { | |
396dc44b | 2337 | flip = 1; |
1da177e4 LT |
2338 | memcpy(tty->flip.char_buf_ptr, ch, read_count); |
2339 | memset(tty->flip.flag_buf_ptr, TTY_NORMAL, read_count); | |
2340 | tty->flip.char_buf_ptr += read_count; | |
2341 | tty->flip.flag_buf_ptr += read_count; | |
2342 | tty->flip.count += read_count; | |
2343 | icount->rx += read_count; | |
2344 | } | |
2345 | } | |
396dc44b PG |
2346 | |
2347 | spin_unlock_irqrestore(&the_port->lock, pflags); | |
2348 | ||
2349 | if (flip) | |
2350 | tty_flip_buffer_push(tty); | |
1da177e4 LT |
2351 | } |
2352 | ||
2353 | /** | |
2354 | * ic4_type - What type of console are we? | |
2355 | * @port: Port to operate with (we ignore since we only have one port) | |
2356 | * | |
2357 | */ | |
2358 | static const char *ic4_type(struct uart_port *the_port) | |
2359 | { | |
2360 | return "SGI IOC4 Serial"; | |
2361 | } | |
2362 | ||
2363 | /** | |
2364 | * ic4_tx_empty - Is the transmitter empty? We pretend we're always empty | |
2365 | * @port: Port to operate on (we ignore since we always return 1) | |
2366 | * | |
2367 | */ | |
2368 | static unsigned int ic4_tx_empty(struct uart_port *the_port) | |
2369 | { | |
2370 | return 1; | |
2371 | } | |
2372 | ||
2373 | /** | |
2374 | * ic4_stop_tx - stop the transmitter | |
2375 | * @port: Port to operate on | |
1da177e4 LT |
2376 | * |
2377 | */ | |
b129a8cc | 2378 | static void ic4_stop_tx(struct uart_port *the_port) |
1da177e4 LT |
2379 | { |
2380 | } | |
2381 | ||
2382 | /** | |
2383 | * null_void_function - | |
2384 | * @port: Port to operate on | |
2385 | * | |
2386 | */ | |
2387 | static void null_void_function(struct uart_port *the_port) | |
2388 | { | |
2389 | } | |
2390 | ||
2391 | /** | |
2392 | * ic4_shutdown - shut down the port - free irq and disable | |
2393 | * @port: Port to shut down | |
2394 | * | |
2395 | */ | |
2396 | static void ic4_shutdown(struct uart_port *the_port) | |
2397 | { | |
2398 | unsigned long port_flags; | |
2399 | struct ioc4_port *port; | |
2400 | struct uart_info *info; | |
2401 | ||
2402 | port = get_ioc4_port(the_port); | |
2403 | if (!port) | |
2404 | return; | |
2405 | ||
2406 | info = the_port->info; | |
2407 | ||
1da177e4 LT |
2408 | wake_up_interruptible(&info->delta_msr_wait); |
2409 | ||
2410 | if (info->tty) | |
2411 | set_bit(TTY_IO_ERROR, &info->tty->flags); | |
2412 | ||
396dc44b | 2413 | spin_lock_irqsave(&the_port->lock, port_flags); |
1da177e4 | 2414 | set_notification(port, N_ALL, 0); |
396dc44b | 2415 | spin_unlock_irqrestore(&the_port->lock, port_flags); |
1da177e4 LT |
2416 | } |
2417 | ||
2418 | /** | |
2419 | * ic4_set_mctrl - set control lines (dtr, rts, etc) | |
2420 | * @port: Port to operate on | |
2421 | * @mctrl: Lines to set/unset | |
2422 | * | |
2423 | */ | |
2424 | static void ic4_set_mctrl(struct uart_port *the_port, unsigned int mctrl) | |
2425 | { | |
2426 | unsigned char mcr = 0; | |
2427 | ||
2428 | if (mctrl & TIOCM_RTS) | |
2429 | mcr |= UART_MCR_RTS; | |
2430 | if (mctrl & TIOCM_DTR) | |
2431 | mcr |= UART_MCR_DTR; | |
2432 | if (mctrl & TIOCM_OUT1) | |
2433 | mcr |= UART_MCR_OUT1; | |
2434 | if (mctrl & TIOCM_OUT2) | |
2435 | mcr |= UART_MCR_OUT2; | |
2436 | if (mctrl & TIOCM_LOOP) | |
2437 | mcr |= UART_MCR_LOOP; | |
2438 | ||
2439 | set_mcr(the_port, 1, mcr, IOC4_SHADOW_DTR); | |
2440 | } | |
2441 | ||
2442 | /** | |
2443 | * ic4_get_mctrl - get control line info | |
2444 | * @port: port to operate on | |
2445 | * | |
2446 | */ | |
2447 | static unsigned int ic4_get_mctrl(struct uart_port *the_port) | |
2448 | { | |
2449 | struct ioc4_port *port = get_ioc4_port(the_port); | |
2450 | uint32_t shadow; | |
2451 | unsigned int ret = 0; | |
2452 | ||
2453 | if (!port) | |
2454 | return 0; | |
2455 | ||
2456 | shadow = readl(&port->ip_serial_regs->shadow); | |
2457 | if (shadow & IOC4_SHADOW_DCD) | |
2458 | ret |= TIOCM_CAR; | |
2459 | if (shadow & IOC4_SHADOW_DR) | |
2460 | ret |= TIOCM_DSR; | |
2461 | if (shadow & IOC4_SHADOW_CTS) | |
2462 | ret |= TIOCM_CTS; | |
2463 | return ret; | |
2464 | } | |
2465 | ||
2466 | /** | |
2467 | * ic4_start_tx - Start transmitter, flush any output | |
2468 | * @port: Port to operate on | |
1da177e4 LT |
2469 | * |
2470 | */ | |
b129a8cc | 2471 | static void ic4_start_tx(struct uart_port *the_port) |
1da177e4 LT |
2472 | { |
2473 | struct ioc4_port *port = get_ioc4_port(the_port); | |
1da177e4 LT |
2474 | |
2475 | if (port) { | |
396dc44b PG |
2476 | set_notification(port, N_OUTPUT_LOWAT, 1); |
2477 | enable_intrs(port, port->ip_hooks->intr_tx_mt); | |
1da177e4 LT |
2478 | } |
2479 | } | |
2480 | ||
2481 | /** | |
2482 | * ic4_break_ctl - handle breaks | |
2483 | * @port: Port to operate on | |
2484 | * @break_state: Break state | |
2485 | * | |
2486 | */ | |
2487 | static void ic4_break_ctl(struct uart_port *the_port, int break_state) | |
2488 | { | |
2489 | } | |
2490 | ||
2491 | /** | |
2492 | * ic4_startup - Start up the serial port - always return 0 (We're always on) | |
2493 | * @port: Port to operate on | |
2494 | * | |
2495 | */ | |
2496 | static int ic4_startup(struct uart_port *the_port) | |
2497 | { | |
2498 | int retval; | |
2499 | struct ioc4_port *port; | |
2500 | struct ioc4_control *control; | |
2501 | struct uart_info *info; | |
2502 | unsigned long port_flags; | |
2503 | ||
2504 | if (!the_port) { | |
2505 | return -ENODEV; | |
2506 | } | |
2507 | port = get_ioc4_port(the_port); | |
2508 | if (!port) { | |
2509 | return -ENODEV; | |
2510 | } | |
2511 | info = the_port->info; | |
2512 | ||
2513 | control = port->ip_control; | |
2514 | if (!control) { | |
2515 | return -ENODEV; | |
2516 | } | |
2517 | ||
2518 | /* Start up the serial port */ | |
396dc44b | 2519 | spin_lock_irqsave(&the_port->lock, port_flags); |
1da177e4 | 2520 | retval = ic4_startup_local(the_port); |
396dc44b | 2521 | spin_unlock_irqrestore(&the_port->lock, port_flags); |
1da177e4 LT |
2522 | return retval; |
2523 | } | |
2524 | ||
2525 | /** | |
2526 | * ic4_set_termios - set termios stuff | |
2527 | * @port: port to operate on | |
2528 | * @termios: New settings | |
2529 | * @termios: Old | |
2530 | * | |
2531 | */ | |
2532 | static void | |
2533 | ic4_set_termios(struct uart_port *the_port, | |
2534 | struct termios *termios, struct termios *old_termios) | |
2535 | { | |
1da177e4 LT |
2536 | unsigned long port_flags; |
2537 | ||
396dc44b | 2538 | spin_lock_irqsave(&the_port->lock, port_flags); |
1da177e4 | 2539 | ioc4_change_speed(the_port, termios, old_termios); |
396dc44b | 2540 | spin_unlock_irqrestore(&the_port->lock, port_flags); |
1da177e4 LT |
2541 | } |
2542 | ||
2543 | /** | |
2544 | * ic4_request_port - allocate resources for port - no op.... | |
2545 | * @port: port to operate on | |
2546 | * | |
2547 | */ | |
2548 | static int ic4_request_port(struct uart_port *port) | |
2549 | { | |
2550 | return 0; | |
2551 | } | |
2552 | ||
2553 | /* Associate the uart functions above - given to serial core */ | |
2554 | ||
2555 | static struct uart_ops ioc4_ops = { | |
2556 | .tx_empty = ic4_tx_empty, | |
2557 | .set_mctrl = ic4_set_mctrl, | |
2558 | .get_mctrl = ic4_get_mctrl, | |
2559 | .stop_tx = ic4_stop_tx, | |
2560 | .start_tx = ic4_start_tx, | |
2561 | .stop_rx = null_void_function, | |
2562 | .enable_ms = null_void_function, | |
2563 | .break_ctl = ic4_break_ctl, | |
2564 | .startup = ic4_startup, | |
2565 | .shutdown = ic4_shutdown, | |
2566 | .set_termios = ic4_set_termios, | |
2567 | .type = ic4_type, | |
2568 | .release_port = null_void_function, | |
2569 | .request_port = ic4_request_port, | |
2570 | }; | |
2571 | ||
2572 | /* | |
2573 | * Boot-time initialization code | |
2574 | */ | |
2575 | ||
2576 | static struct uart_driver ioc4_uart = { | |
2577 | .owner = THIS_MODULE, | |
2578 | .driver_name = "ioc4_serial", | |
2579 | .dev_name = DEVICE_NAME, | |
2580 | .major = DEVICE_MAJOR, | |
2581 | .minor = DEVICE_MINOR, | |
2582 | .nr = IOC4_NUM_CARDS * IOC4_NUM_SERIAL_PORTS, | |
2583 | }; | |
2584 | ||
2585 | /** | |
2586 | * ioc4_serial_core_attach - register with serial core | |
2587 | * This is done during pci probing | |
2588 | * @pdev: handle for this card | |
2589 | */ | |
2590 | static inline int | |
2591 | ioc4_serial_core_attach(struct pci_dev *pdev) | |
2592 | { | |
2593 | struct ioc4_port *port; | |
2594 | struct uart_port *the_port; | |
22329b51 BC |
2595 | struct ioc4_driver_data *idd = pci_get_drvdata(pdev); |
2596 | struct ioc4_control *control = idd->idd_serial_data; | |
1da177e4 LT |
2597 | int ii; |
2598 | ||
2599 | DPRINT_CONFIG(("%s: attach pdev 0x%p - control 0x%p\n", | |
2600 | __FUNCTION__, pdev, (void *)control)); | |
2601 | ||
2602 | if (!control) | |
2603 | return -ENODEV; | |
2604 | ||
2605 | /* once around for each port on this card */ | |
2606 | for (ii = 0; ii < IOC4_NUM_SERIAL_PORTS; ii++) { | |
2607 | the_port = &control->ic_port[ii].icp_uart_port; | |
2608 | port = control->ic_port[ii].icp_port; | |
2609 | port->ip_port = the_port; | |
2610 | ||
2611 | DPRINT_CONFIG(("%s: attach the_port 0x%p / port 0x%p\n", | |
2612 | __FUNCTION__, (void *)the_port, | |
2613 | (void *)port)); | |
2614 | ||
1da177e4 LT |
2615 | /* membase, iobase and mapbase just need to be non-0 */ |
2616 | the_port->membase = (unsigned char __iomem *)1; | |
396dc44b PG |
2617 | the_port->iobase = (pdev->bus->number << 16) | ii; |
2618 | the_port->line = (Num_of_ioc4_cards << 2) | ii; | |
1da177e4 LT |
2619 | the_port->mapbase = 1; |
2620 | the_port->type = PORT_16550A; | |
396dc44b | 2621 | the_port->fifosize = IOC4_FIFO_CHARS; |
1da177e4 LT |
2622 | the_port->ops = &ioc4_ops; |
2623 | the_port->irq = control->ic_irq; | |
2624 | the_port->dev = &pdev->dev; | |
396dc44b | 2625 | spin_lock_init(&the_port->lock); |
1da177e4 LT |
2626 | if (uart_add_one_port(&ioc4_uart, the_port) < 0) { |
2627 | printk(KERN_WARNING | |
396dc44b PG |
2628 | "%s: unable to add port %d bus %d\n", |
2629 | __FUNCTION__, the_port->line, pdev->bus->number); | |
1da177e4 LT |
2630 | } else { |
2631 | DPRINT_CONFIG( | |
396dc44b PG |
2632 | ("IOC4 serial port %d irq = %d, bus %d\n", |
2633 | the_port->line, the_port->irq, pdev->bus->number)); | |
1da177e4 LT |
2634 | } |
2635 | /* all ports are rs232 for now */ | |
2636 | ioc4_set_proto(port, PROTO_RS232); | |
2637 | } | |
2638 | return 0; | |
2639 | } | |
2640 | ||
2641 | /** | |
2642 | * ioc4_serial_attach_one - register attach function | |
22329b51 BC |
2643 | * called per card found from IOC4 master module. |
2644 | * @idd: Master module data for this IOC4 | |
1da177e4 LT |
2645 | */ |
2646 | int | |
22329b51 | 2647 | ioc4_serial_attach_one(struct ioc4_driver_data *idd) |
1da177e4 | 2648 | { |
22329b51 | 2649 | unsigned long tmp_addr1; |
1da177e4 LT |
2650 | struct ioc4_serial __iomem *serial; |
2651 | struct ioc4_soft *soft; | |
2652 | struct ioc4_control *control; | |
22329b51 | 2653 | int ret = 0; |
1da177e4 LT |
2654 | |
2655 | ||
22329b51 | 2656 | DPRINT_CONFIG(("%s (0x%p, 0x%p)\n", __FUNCTION__, idd->idd_pdev, idd->idd_pci_id)); |
1da177e4 LT |
2657 | |
2658 | /* request serial registers */ | |
22329b51 | 2659 | tmp_addr1 = idd->idd_bar0 + IOC4_SERIAL_OFFSET; |
1da177e4 LT |
2660 | |
2661 | if (!request_region(tmp_addr1, sizeof(struct ioc4_serial), | |
2662 | "sioc4_uart")) { | |
2663 | printk(KERN_WARNING | |
2664 | "ioc4 (%p): unable to get request region for " | |
22329b51 | 2665 | "uart space\n", (void *)idd->idd_pdev); |
1da177e4 LT |
2666 | ret = -ENODEV; |
2667 | goto out1; | |
2668 | } | |
2669 | serial = ioremap(tmp_addr1, sizeof(struct ioc4_serial)); | |
2670 | if (!serial) { | |
2671 | printk(KERN_WARNING | |
2672 | "ioc4 (%p) : unable to remap ioc4 serial register\n", | |
22329b51 | 2673 | (void *)idd->idd_pdev); |
1da177e4 LT |
2674 | ret = -ENODEV; |
2675 | goto out2; | |
2676 | } | |
2677 | DPRINT_CONFIG(("%s : mem 0x%p, serial 0x%p\n", | |
22329b51 | 2678 | __FUNCTION__, (void *)idd->idd_misc_regs, (void *)serial)); |
1da177e4 LT |
2679 | |
2680 | /* Get memory for the new card */ | |
2681 | control = kmalloc(sizeof(struct ioc4_control) * IOC4_NUM_SERIAL_PORTS, | |
2682 | GFP_KERNEL); | |
2683 | ||
2684 | if (!control) { | |
2685 | printk(KERN_WARNING "ioc4_attach_one" | |
2686 | ": unable to get memory for the IOC4\n"); | |
2687 | ret = -ENOMEM; | |
2688 | goto out2; | |
2689 | } | |
2690 | memset(control, 0, sizeof(struct ioc4_control)); | |
22329b51 | 2691 | idd->idd_serial_data = control; |
1da177e4 LT |
2692 | |
2693 | /* Allocate the soft structure */ | |
2694 | soft = kmalloc(sizeof(struct ioc4_soft), GFP_KERNEL); | |
2695 | if (!soft) { | |
2696 | printk(KERN_WARNING | |
2697 | "ioc4 (%p): unable to get memory for the soft struct\n", | |
22329b51 | 2698 | (void *)idd->idd_pdev); |
1da177e4 LT |
2699 | ret = -ENOMEM; |
2700 | goto out3; | |
2701 | } | |
2702 | memset(soft, 0, sizeof(struct ioc4_soft)); | |
2703 | ||
2704 | spin_lock_init(&soft->is_ir_lock); | |
22329b51 | 2705 | soft->is_ioc4_misc_addr = idd->idd_misc_regs; |
1da177e4 LT |
2706 | soft->is_ioc4_serial_addr = serial; |
2707 | ||
2708 | /* Init the IOC4 */ | |
22329b51 BC |
2709 | writel(0xf << IOC4_SIO_CR_CMD_PULSE_SHIFT, |
2710 | &idd->idd_misc_regs->sio_cr.raw); | |
1da177e4 LT |
2711 | |
2712 | /* Enable serial port mode select generic PIO pins as outputs */ | |
2713 | writel(IOC4_GPCR_UART0_MODESEL | IOC4_GPCR_UART1_MODESEL | |
2714 | | IOC4_GPCR_UART2_MODESEL | IOC4_GPCR_UART3_MODESEL, | |
22329b51 | 2715 | &idd->idd_misc_regs->gpcr_s.raw); |
1da177e4 | 2716 | |
22329b51 | 2717 | /* Clear and disable all serial interrupts */ |
1da177e4 | 2718 | write_ireg(soft, ~0, IOC4_W_IEC, IOC4_SIO_INTR_TYPE); |
22329b51 BC |
2719 | writel(~0, &idd->idd_misc_regs->sio_ir.raw); |
2720 | write_ireg(soft, IOC4_OTHER_IR_SER_MEMERR, IOC4_W_IEC, | |
2721 | IOC4_OTHER_INTR_TYPE); | |
2722 | writel(IOC4_OTHER_IR_SER_MEMERR, &idd->idd_misc_regs->other_ir.raw); | |
1da177e4 | 2723 | control->ic_soft = soft; |
22329b51 BC |
2724 | |
2725 | /* Hook up interrupt handler */ | |
2726 | if (!request_irq(idd->idd_pdev->irq, ioc4_intr, SA_SHIRQ, | |
1da177e4 | 2727 | "sgi-ioc4serial", (void *)soft)) { |
22329b51 | 2728 | control->ic_irq = idd->idd_pdev->irq; |
1da177e4 LT |
2729 | } else { |
2730 | printk(KERN_WARNING | |
2731 | "%s : request_irq fails for IRQ 0x%x\n ", | |
22329b51 | 2732 | __FUNCTION__, idd->idd_pdev->irq); |
1da177e4 | 2733 | } |
d4c477ca BC |
2734 | ret = ioc4_attach_local(idd); |
2735 | if (ret) | |
1da177e4 LT |
2736 | goto out4; |
2737 | ||
2738 | /* register port with the serial core */ | |
2739 | ||
22329b51 | 2740 | if ((ret = ioc4_serial_core_attach(idd->idd_pdev))) |
1da177e4 LT |
2741 | goto out4; |
2742 | ||
396dc44b PG |
2743 | Num_of_ioc4_cards++; |
2744 | ||
1da177e4 LT |
2745 | return ret; |
2746 | ||
2747 | /* error exits that give back resources */ | |
2748 | out4: | |
2749 | kfree(soft); | |
2750 | out3: | |
2751 | kfree(control); | |
2752 | out2: | |
2753 | release_region(tmp_addr1, sizeof(struct ioc4_serial)); | |
2754 | out1: | |
1da177e4 LT |
2755 | |
2756 | return ret; | |
2757 | } | |
2758 | ||
2759 | ||
2760 | /** | |
2761 | * ioc4_serial_remove_one - detach function | |
2762 | * | |
22329b51 | 2763 | * @idd: IOC4 master module data for this IOC4 |
1da177e4 LT |
2764 | */ |
2765 | ||
22329b51 | 2766 | int ioc4_serial_remove_one(struct ioc4_driver_data *idd) |
1da177e4 LT |
2767 | { |
2768 | int ii; | |
2769 | struct ioc4_control *control; | |
2770 | struct uart_port *the_port; | |
2771 | struct ioc4_port *port; | |
2772 | struct ioc4_soft *soft; | |
2773 | ||
22329b51 | 2774 | control = idd->idd_serial_data; |
1da177e4 LT |
2775 | |
2776 | for (ii = 0; ii < IOC4_NUM_SERIAL_PORTS; ii++) { | |
2777 | the_port = &control->ic_port[ii].icp_uart_port; | |
2778 | if (the_port) { | |
2779 | uart_remove_one_port(&ioc4_uart, the_port); | |
2780 | } | |
2781 | port = control->ic_port[ii].icp_port; | |
2782 | if (!(ii & 1) && port) { | |
2783 | pci_free_consistent(port->ip_pdev, | |
2784 | TOTAL_RING_BUF_SIZE, | |
2785 | (void *)port->ip_cpu_ringbuf, | |
2786 | port->ip_dma_ringbuf); | |
2787 | kfree(port); | |
2788 | } | |
2789 | } | |
2790 | soft = control->ic_soft; | |
2791 | if (soft) { | |
2792 | free_irq(control->ic_irq, (void *)soft); | |
2793 | if (soft->is_ioc4_serial_addr) { | |
2794 | release_region((unsigned long) | |
2795 | soft->is_ioc4_serial_addr, | |
2796 | sizeof(struct ioc4_serial)); | |
2797 | } | |
2798 | kfree(soft); | |
2799 | } | |
2800 | kfree(control); | |
22329b51 BC |
2801 | idd->idd_serial_data = NULL; |
2802 | ||
2803 | return 0; | |
1da177e4 | 2804 | } |
22329b51 BC |
2805 | |
2806 | static struct ioc4_submodule ioc4_serial_submodule = { | |
2807 | .is_name = "IOC4_serial", | |
2808 | .is_owner = THIS_MODULE, | |
2809 | .is_probe = ioc4_serial_attach_one, | |
2810 | .is_remove = ioc4_serial_remove_one, | |
2811 | }; | |
1da177e4 LT |
2812 | |
2813 | /** | |
2814 | * ioc4_serial_init - module init | |
2815 | */ | |
2816 | int ioc4_serial_init(void) | |
2817 | { | |
2818 | int ret; | |
2819 | ||
2820 | /* register with serial core */ | |
2821 | if ((ret = uart_register_driver(&ioc4_uart)) < 0) { | |
2822 | printk(KERN_WARNING | |
2823 | "%s: Couldn't register IOC4 serial driver\n", | |
2824 | __FUNCTION__); | |
2825 | return ret; | |
2826 | } | |
22329b51 BC |
2827 | |
2828 | /* register with IOC4 main module */ | |
2829 | return ioc4_register_submodule(&ioc4_serial_submodule); | |
1da177e4 LT |
2830 | } |
2831 | ||
22329b51 BC |
2832 | static void __devexit ioc4_serial_exit(void) |
2833 | { | |
2834 | ioc4_unregister_submodule(&ioc4_serial_submodule); | |
2835 | uart_unregister_driver(&ioc4_uart); | |
2836 | } | |
2837 | ||
2838 | module_init(ioc4_serial_init); | |
2839 | module_exit(ioc4_serial_exit); | |
2840 | ||
1da177e4 LT |
2841 | MODULE_AUTHOR("Pat Gefre - Silicon Graphics Inc. (SGI) <pfg@sgi.com>"); |
2842 | MODULE_DESCRIPTION("Serial PCI driver module for SGI IOC4 Base-IO Card"); | |
2843 | MODULE_LICENSE("GPL"); |