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1da177e4 | 1 | /* |
1da177e4 LT |
2 | * Generic driver for the MPSC (UART mode) on Marvell parts (e.g., GT64240, |
3 | * GT64260, MV64340, MV64360, GT96100, ... ). | |
4 | * | |
5 | * Author: Mark A. Greer <mgreer@mvista.com> | |
6 | * | |
7 | * Based on an old MPSC driver that was in the linuxppc tree. It appears to | |
8 | * have been created by Chris Zankel (formerly of MontaVista) but there | |
9 | * is no proper Copyright so I'm not sure. Apparently, parts were also | |
10 | * taken from PPCBoot (now U-Boot). Also based on drivers/serial/8250.c | |
11 | * by Russell King. | |
12 | * | |
13 | * 2004 (c) MontaVista, Software, Inc. This file is licensed under | |
14 | * the terms of the GNU General Public License version 2. This program | |
15 | * is licensed "as is" without any warranty of any kind, whether express | |
16 | * or implied. | |
17 | */ | |
18 | /* | |
19 | * The MPSC interface is much like a typical network controller's interface. | |
20 | * That is, you set up separate rings of descriptors for transmitting and | |
21 | * receiving data. There is also a pool of buffers with (one buffer per | |
22 | * descriptor) that incoming data are dma'd into or outgoing data are dma'd | |
23 | * out of. | |
24 | * | |
25 | * The MPSC requires two other controllers to be able to work. The Baud Rate | |
26 | * Generator (BRG) provides a clock at programmable frequencies which determines | |
27 | * the baud rate. The Serial DMA Controller (SDMA) takes incoming data from the | |
28 | * MPSC and DMA's it into memory or DMA's outgoing data and passes it to the | |
29 | * MPSC. It is actually the SDMA interrupt that the driver uses to keep the | |
30 | * transmit and receive "engines" going (i.e., indicate data has been | |
31 | * transmitted or received). | |
32 | * | |
33 | * NOTES: | |
34 | * | |
35 | * 1) Some chips have an erratum where several regs cannot be | |
36 | * read. To work around that, we keep a local copy of those regs in | |
37 | * 'mpsc_port_info'. | |
38 | * | |
39 | * 2) Some chips have an erratum where the ctlr will hang when the SDMA ctlr | |
40 | * accesses system mem with coherency enabled. For that reason, the driver | |
41 | * assumes that coherency for that ctlr has been disabled. This means | |
42 | * that when in a cache coherent system, the driver has to manually manage | |
43 | * the data cache on the areas that it touches because the dma_* macro are | |
44 | * basically no-ops. | |
45 | * | |
46 | * 3) There is an erratum (on PPC) where you can't use the instruction to do | |
47 | * a DMA_TO_DEVICE/cache clean so DMA_BIDIRECTIONAL/flushes are used in places | |
48 | * where a DMA_TO_DEVICE/clean would have [otherwise] sufficed. | |
49 | * | |
50 | * 4) AFAICT, hardware flow control isn't supported by the controller --MAG. | |
51 | */ | |
52 | ||
e4294b3e MG |
53 | |
54 | #if defined(CONFIG_SERIAL_MPSC_CONSOLE) && defined(CONFIG_MAGIC_SYSRQ) | |
55 | #define SUPPORT_SYSRQ | |
56 | #endif | |
57 | ||
58 | #include <linux/module.h> | |
59 | #include <linux/moduleparam.h> | |
60 | #include <linux/tty.h> | |
61 | #include <linux/tty_flip.h> | |
62 | #include <linux/ioport.h> | |
63 | #include <linux/init.h> | |
64 | #include <linux/console.h> | |
65 | #include <linux/sysrq.h> | |
66 | #include <linux/serial.h> | |
67 | #include <linux/serial_core.h> | |
68 | #include <linux/delay.h> | |
69 | #include <linux/device.h> | |
70 | #include <linux/dma-mapping.h> | |
71 | #include <linux/mv643xx.h> | |
d052d1be RK |
72 | #include <linux/platform_device.h> |
73 | ||
e4294b3e MG |
74 | #include <asm/io.h> |
75 | #include <asm/irq.h> | |
76 | ||
e4294b3e MG |
77 | #define MPSC_NUM_CTLRS 2 |
78 | ||
79 | /* | |
80 | * Descriptors and buffers must be cache line aligned. | |
81 | * Buffers lengths must be multiple of cache line size. | |
82 | * Number of Tx & Rx descriptors must be powers of 2. | |
83 | */ | |
84 | #define MPSC_RXR_ENTRIES 32 | |
85 | #define MPSC_RXRE_SIZE dma_get_cache_alignment() | |
86 | #define MPSC_RXR_SIZE (MPSC_RXR_ENTRIES * MPSC_RXRE_SIZE) | |
87 | #define MPSC_RXBE_SIZE dma_get_cache_alignment() | |
88 | #define MPSC_RXB_SIZE (MPSC_RXR_ENTRIES * MPSC_RXBE_SIZE) | |
89 | ||
90 | #define MPSC_TXR_ENTRIES 32 | |
91 | #define MPSC_TXRE_SIZE dma_get_cache_alignment() | |
92 | #define MPSC_TXR_SIZE (MPSC_TXR_ENTRIES * MPSC_TXRE_SIZE) | |
93 | #define MPSC_TXBE_SIZE dma_get_cache_alignment() | |
94 | #define MPSC_TXB_SIZE (MPSC_TXR_ENTRIES * MPSC_TXBE_SIZE) | |
95 | ||
2e89db75 MG |
96 | #define MPSC_DMA_ALLOC_SIZE (MPSC_RXR_SIZE + MPSC_RXB_SIZE + MPSC_TXR_SIZE \ |
97 | + MPSC_TXB_SIZE + dma_get_cache_alignment() /* for alignment */) | |
e4294b3e MG |
98 | |
99 | /* Rx and Tx Ring entry descriptors -- assume entry size is <= cacheline size */ | |
100 | struct mpsc_rx_desc { | |
101 | u16 bufsize; | |
102 | u16 bytecnt; | |
103 | u32 cmdstat; | |
104 | u32 link; | |
105 | u32 buf_ptr; | |
106 | } __attribute((packed)); | |
107 | ||
108 | struct mpsc_tx_desc { | |
109 | u16 bytecnt; | |
110 | u16 shadow; | |
111 | u32 cmdstat; | |
112 | u32 link; | |
113 | u32 buf_ptr; | |
114 | } __attribute((packed)); | |
115 | ||
116 | /* | |
117 | * Some regs that have the erratum that you can't read them are are shared | |
118 | * between the two MPSC controllers. This struct contains those shared regs. | |
119 | */ | |
120 | struct mpsc_shared_regs { | |
121 | phys_addr_t mpsc_routing_base_p; | |
122 | phys_addr_t sdma_intr_base_p; | |
123 | ||
124 | void __iomem *mpsc_routing_base; | |
125 | void __iomem *sdma_intr_base; | |
126 | ||
127 | u32 MPSC_MRR_m; | |
128 | u32 MPSC_RCRR_m; | |
129 | u32 MPSC_TCRR_m; | |
130 | u32 SDMA_INTR_CAUSE_m; | |
131 | u32 SDMA_INTR_MASK_m; | |
132 | }; | |
133 | ||
134 | /* The main driver data structure */ | |
135 | struct mpsc_port_info { | |
136 | struct uart_port port; /* Overlay uart_port structure */ | |
137 | ||
138 | /* Internal driver state for this ctlr */ | |
139 | u8 ready; | |
140 | u8 rcv_data; | |
141 | tcflag_t c_iflag; /* save termios->c_iflag */ | |
142 | tcflag_t c_cflag; /* save termios->c_cflag */ | |
143 | ||
144 | /* Info passed in from platform */ | |
145 | u8 mirror_regs; /* Need to mirror regs? */ | |
146 | u8 cache_mgmt; /* Need manual cache mgmt? */ | |
147 | u8 brg_can_tune; /* BRG has baud tuning? */ | |
148 | u32 brg_clk_src; | |
149 | u16 mpsc_max_idle; | |
150 | int default_baud; | |
151 | int default_bits; | |
152 | int default_parity; | |
153 | int default_flow; | |
154 | ||
155 | /* Physical addresses of various blocks of registers (from platform) */ | |
156 | phys_addr_t mpsc_base_p; | |
157 | phys_addr_t sdma_base_p; | |
158 | phys_addr_t brg_base_p; | |
159 | ||
160 | /* Virtual addresses of various blocks of registers (from platform) */ | |
161 | void __iomem *mpsc_base; | |
162 | void __iomem *sdma_base; | |
163 | void __iomem *brg_base; | |
164 | ||
165 | /* Descriptor ring and buffer allocations */ | |
166 | void *dma_region; | |
167 | dma_addr_t dma_region_p; | |
168 | ||
169 | dma_addr_t rxr; /* Rx descriptor ring */ | |
170 | dma_addr_t rxr_p; /* Phys addr of rxr */ | |
171 | u8 *rxb; /* Rx Ring I/O buf */ | |
172 | u8 *rxb_p; /* Phys addr of rxb */ | |
173 | u32 rxr_posn; /* First desc w/ Rx data */ | |
174 | ||
175 | dma_addr_t txr; /* Tx descriptor ring */ | |
176 | dma_addr_t txr_p; /* Phys addr of txr */ | |
177 | u8 *txb; /* Tx Ring I/O buf */ | |
178 | u8 *txb_p; /* Phys addr of txb */ | |
179 | int txr_head; /* Where new data goes */ | |
180 | int txr_tail; /* Where sent data comes off */ | |
1733310b | 181 | spinlock_t tx_lock; /* transmit lock */ |
e4294b3e MG |
182 | |
183 | /* Mirrored values of regs we can't read (if 'mirror_regs' set) */ | |
184 | u32 MPSC_MPCR_m; | |
185 | u32 MPSC_CHR_1_m; | |
186 | u32 MPSC_CHR_2_m; | |
187 | u32 MPSC_CHR_10_m; | |
188 | u32 BRG_BCR_m; | |
189 | struct mpsc_shared_regs *shared_regs; | |
190 | }; | |
191 | ||
192 | /* Hooks to platform-specific code */ | |
193 | int mpsc_platform_register_driver(void); | |
194 | void mpsc_platform_unregister_driver(void); | |
195 | ||
196 | /* Hooks back in to mpsc common to be called by platform-specific code */ | |
197 | struct mpsc_port_info *mpsc_device_probe(int index); | |
198 | struct mpsc_port_info *mpsc_device_remove(int index); | |
199 | ||
200 | /* Main MPSC Configuration Register Offsets */ | |
201 | #define MPSC_MMCRL 0x0000 | |
202 | #define MPSC_MMCRH 0x0004 | |
203 | #define MPSC_MPCR 0x0008 | |
204 | #define MPSC_CHR_1 0x000c | |
205 | #define MPSC_CHR_2 0x0010 | |
206 | #define MPSC_CHR_3 0x0014 | |
207 | #define MPSC_CHR_4 0x0018 | |
208 | #define MPSC_CHR_5 0x001c | |
209 | #define MPSC_CHR_6 0x0020 | |
210 | #define MPSC_CHR_7 0x0024 | |
211 | #define MPSC_CHR_8 0x0028 | |
212 | #define MPSC_CHR_9 0x002c | |
213 | #define MPSC_CHR_10 0x0030 | |
214 | #define MPSC_CHR_11 0x0034 | |
215 | ||
216 | #define MPSC_MPCR_FRZ (1 << 9) | |
217 | #define MPSC_MPCR_CL_5 0 | |
218 | #define MPSC_MPCR_CL_6 1 | |
219 | #define MPSC_MPCR_CL_7 2 | |
220 | #define MPSC_MPCR_CL_8 3 | |
221 | #define MPSC_MPCR_SBL_1 0 | |
222 | #define MPSC_MPCR_SBL_2 1 | |
223 | ||
224 | #define MPSC_CHR_2_TEV (1<<1) | |
225 | #define MPSC_CHR_2_TA (1<<7) | |
226 | #define MPSC_CHR_2_TTCS (1<<9) | |
227 | #define MPSC_CHR_2_REV (1<<17) | |
228 | #define MPSC_CHR_2_RA (1<<23) | |
229 | #define MPSC_CHR_2_CRD (1<<25) | |
230 | #define MPSC_CHR_2_EH (1<<31) | |
231 | #define MPSC_CHR_2_PAR_ODD 0 | |
232 | #define MPSC_CHR_2_PAR_SPACE 1 | |
233 | #define MPSC_CHR_2_PAR_EVEN 2 | |
234 | #define MPSC_CHR_2_PAR_MARK 3 | |
235 | ||
236 | /* MPSC Signal Routing */ | |
237 | #define MPSC_MRR 0x0000 | |
238 | #define MPSC_RCRR 0x0004 | |
239 | #define MPSC_TCRR 0x0008 | |
240 | ||
241 | /* Serial DMA Controller Interface Registers */ | |
242 | #define SDMA_SDC 0x0000 | |
243 | #define SDMA_SDCM 0x0008 | |
244 | #define SDMA_RX_DESC 0x0800 | |
245 | #define SDMA_RX_BUF_PTR 0x0808 | |
246 | #define SDMA_SCRDP 0x0810 | |
247 | #define SDMA_TX_DESC 0x0c00 | |
248 | #define SDMA_SCTDP 0x0c10 | |
249 | #define SDMA_SFTDP 0x0c14 | |
250 | ||
251 | #define SDMA_DESC_CMDSTAT_PE (1<<0) | |
252 | #define SDMA_DESC_CMDSTAT_CDL (1<<1) | |
253 | #define SDMA_DESC_CMDSTAT_FR (1<<3) | |
254 | #define SDMA_DESC_CMDSTAT_OR (1<<6) | |
255 | #define SDMA_DESC_CMDSTAT_BR (1<<9) | |
256 | #define SDMA_DESC_CMDSTAT_MI (1<<10) | |
257 | #define SDMA_DESC_CMDSTAT_A (1<<11) | |
258 | #define SDMA_DESC_CMDSTAT_AM (1<<12) | |
259 | #define SDMA_DESC_CMDSTAT_CT (1<<13) | |
260 | #define SDMA_DESC_CMDSTAT_C (1<<14) | |
261 | #define SDMA_DESC_CMDSTAT_ES (1<<15) | |
262 | #define SDMA_DESC_CMDSTAT_L (1<<16) | |
263 | #define SDMA_DESC_CMDSTAT_F (1<<17) | |
264 | #define SDMA_DESC_CMDSTAT_P (1<<18) | |
265 | #define SDMA_DESC_CMDSTAT_EI (1<<23) | |
266 | #define SDMA_DESC_CMDSTAT_O (1<<31) | |
267 | ||
2e89db75 MG |
268 | #define SDMA_DESC_DFLT (SDMA_DESC_CMDSTAT_O \ |
269 | | SDMA_DESC_CMDSTAT_EI) | |
e4294b3e MG |
270 | |
271 | #define SDMA_SDC_RFT (1<<0) | |
272 | #define SDMA_SDC_SFM (1<<1) | |
273 | #define SDMA_SDC_BLMR (1<<6) | |
274 | #define SDMA_SDC_BLMT (1<<7) | |
275 | #define SDMA_SDC_POVR (1<<8) | |
276 | #define SDMA_SDC_RIFB (1<<9) | |
277 | ||
278 | #define SDMA_SDCM_ERD (1<<7) | |
279 | #define SDMA_SDCM_AR (1<<15) | |
280 | #define SDMA_SDCM_STD (1<<16) | |
281 | #define SDMA_SDCM_TXD (1<<23) | |
282 | #define SDMA_SDCM_AT (1<<31) | |
283 | ||
284 | #define SDMA_0_CAUSE_RXBUF (1<<0) | |
285 | #define SDMA_0_CAUSE_RXERR (1<<1) | |
286 | #define SDMA_0_CAUSE_TXBUF (1<<2) | |
287 | #define SDMA_0_CAUSE_TXEND (1<<3) | |
288 | #define SDMA_1_CAUSE_RXBUF (1<<8) | |
289 | #define SDMA_1_CAUSE_RXERR (1<<9) | |
290 | #define SDMA_1_CAUSE_TXBUF (1<<10) | |
291 | #define SDMA_1_CAUSE_TXEND (1<<11) | |
292 | ||
2e89db75 MG |
293 | #define SDMA_CAUSE_RX_MASK (SDMA_0_CAUSE_RXBUF | SDMA_0_CAUSE_RXERR \ |
294 | | SDMA_1_CAUSE_RXBUF | SDMA_1_CAUSE_RXERR) | |
295 | #define SDMA_CAUSE_TX_MASK (SDMA_0_CAUSE_TXBUF | SDMA_0_CAUSE_TXEND \ | |
296 | | SDMA_1_CAUSE_TXBUF | SDMA_1_CAUSE_TXEND) | |
e4294b3e MG |
297 | |
298 | /* SDMA Interrupt registers */ | |
299 | #define SDMA_INTR_CAUSE 0x0000 | |
300 | #define SDMA_INTR_MASK 0x0080 | |
301 | ||
302 | /* Baud Rate Generator Interface Registers */ | |
303 | #define BRG_BCR 0x0000 | |
304 | #define BRG_BTR 0x0004 | |
1da177e4 LT |
305 | |
306 | /* | |
307 | * Define how this driver is known to the outside (we've been assigned a | |
308 | * range on the "Low-density serial ports" major). | |
309 | */ | |
2e89db75 MG |
310 | #define MPSC_MAJOR 204 |
311 | #define MPSC_MINOR_START 44 | |
312 | #define MPSC_DRIVER_NAME "MPSC" | |
313 | #define MPSC_DEV_NAME "ttyMM" | |
314 | #define MPSC_VERSION "1.00" | |
1da177e4 LT |
315 | |
316 | static struct mpsc_port_info mpsc_ports[MPSC_NUM_CTLRS]; | |
317 | static struct mpsc_shared_regs mpsc_shared_regs; | |
4d0145a7 | 318 | static struct uart_driver mpsc_reg; |
1da177e4 | 319 | |
4d0145a7 LN |
320 | static void mpsc_start_rx(struct mpsc_port_info *pi); |
321 | static void mpsc_free_ring_mem(struct mpsc_port_info *pi); | |
322 | static void mpsc_release_port(struct uart_port *port); | |
1da177e4 LT |
323 | /* |
324 | ****************************************************************************** | |
325 | * | |
326 | * Baud Rate Generator Routines (BRG) | |
327 | * | |
328 | ****************************************************************************** | |
329 | */ | |
2e89db75 | 330 | static void mpsc_brg_init(struct mpsc_port_info *pi, u32 clk_src) |
1da177e4 LT |
331 | { |
332 | u32 v; | |
333 | ||
334 | v = (pi->mirror_regs) ? pi->BRG_BCR_m : readl(pi->brg_base + BRG_BCR); | |
335 | v = (v & ~(0xf << 18)) | ((clk_src & 0xf) << 18); | |
336 | ||
337 | if (pi->brg_can_tune) | |
338 | v &= ~(1 << 25); | |
339 | ||
340 | if (pi->mirror_regs) | |
341 | pi->BRG_BCR_m = v; | |
342 | writel(v, pi->brg_base + BRG_BCR); | |
343 | ||
344 | writel(readl(pi->brg_base + BRG_BTR) & 0xffff0000, | |
345 | pi->brg_base + BRG_BTR); | |
1da177e4 LT |
346 | } |
347 | ||
2e89db75 | 348 | static void mpsc_brg_enable(struct mpsc_port_info *pi) |
1da177e4 LT |
349 | { |
350 | u32 v; | |
351 | ||
352 | v = (pi->mirror_regs) ? pi->BRG_BCR_m : readl(pi->brg_base + BRG_BCR); | |
353 | v |= (1 << 16); | |
354 | ||
355 | if (pi->mirror_regs) | |
356 | pi->BRG_BCR_m = v; | |
357 | writel(v, pi->brg_base + BRG_BCR); | |
1da177e4 LT |
358 | } |
359 | ||
2e89db75 | 360 | static void mpsc_brg_disable(struct mpsc_port_info *pi) |
1da177e4 LT |
361 | { |
362 | u32 v; | |
363 | ||
364 | v = (pi->mirror_regs) ? pi->BRG_BCR_m : readl(pi->brg_base + BRG_BCR); | |
365 | v &= ~(1 << 16); | |
366 | ||
367 | if (pi->mirror_regs) | |
368 | pi->BRG_BCR_m = v; | |
369 | writel(v, pi->brg_base + BRG_BCR); | |
1da177e4 LT |
370 | } |
371 | ||
2e89db75 MG |
372 | /* |
373 | * To set the baud, we adjust the CDV field in the BRG_BCR reg. | |
374 | * From manual: Baud = clk / ((CDV+1)*2) ==> CDV = (clk / (baud*2)) - 1. | |
375 | * However, the input clock is divided by 16 in the MPSC b/c of how | |
376 | * 'MPSC_MMCRH' was set up so we have to divide the 'clk' used in our | |
377 | * calculation by 16 to account for that. So the real calculation | |
378 | * that accounts for the way the mpsc is set up is: | |
379 | * CDV = (clk / (baud*2*16)) - 1 ==> CDV = (clk / (baud << 5)) - 1. | |
380 | */ | |
381 | static void mpsc_set_baudrate(struct mpsc_port_info *pi, u32 baud) | |
1da177e4 | 382 | { |
1da177e4 LT |
383 | u32 cdv = (pi->port.uartclk / (baud << 5)) - 1; |
384 | u32 v; | |
385 | ||
386 | mpsc_brg_disable(pi); | |
387 | v = (pi->mirror_regs) ? pi->BRG_BCR_m : readl(pi->brg_base + BRG_BCR); | |
388 | v = (v & 0xffff0000) | (cdv & 0xffff); | |
389 | ||
390 | if (pi->mirror_regs) | |
391 | pi->BRG_BCR_m = v; | |
392 | writel(v, pi->brg_base + BRG_BCR); | |
393 | mpsc_brg_enable(pi); | |
1da177e4 LT |
394 | } |
395 | ||
396 | /* | |
397 | ****************************************************************************** | |
398 | * | |
399 | * Serial DMA Routines (SDMA) | |
400 | * | |
401 | ****************************************************************************** | |
402 | */ | |
403 | ||
2e89db75 | 404 | static void mpsc_sdma_burstsize(struct mpsc_port_info *pi, u32 burst_size) |
1da177e4 LT |
405 | { |
406 | u32 v; | |
407 | ||
408 | pr_debug("mpsc_sdma_burstsize[%d]: burst_size: %d\n", | |
2e89db75 | 409 | pi->port.line, burst_size); |
1da177e4 LT |
410 | |
411 | burst_size >>= 3; /* Divide by 8 b/c reg values are 8-byte chunks */ | |
412 | ||
413 | if (burst_size < 2) | |
414 | v = 0x0; /* 1 64-bit word */ | |
415 | else if (burst_size < 4) | |
416 | v = 0x1; /* 2 64-bit words */ | |
417 | else if (burst_size < 8) | |
418 | v = 0x2; /* 4 64-bit words */ | |
419 | else | |
420 | v = 0x3; /* 8 64-bit words */ | |
421 | ||
422 | writel((readl(pi->sdma_base + SDMA_SDC) & (0x3 << 12)) | (v << 12), | |
423 | pi->sdma_base + SDMA_SDC); | |
1da177e4 LT |
424 | } |
425 | ||
2e89db75 | 426 | static void mpsc_sdma_init(struct mpsc_port_info *pi, u32 burst_size) |
1da177e4 LT |
427 | { |
428 | pr_debug("mpsc_sdma_init[%d]: burst_size: %d\n", pi->port.line, | |
429 | burst_size); | |
430 | ||
431 | writel((readl(pi->sdma_base + SDMA_SDC) & 0x3ff) | 0x03f, | |
432 | pi->sdma_base + SDMA_SDC); | |
433 | mpsc_sdma_burstsize(pi, burst_size); | |
1da177e4 LT |
434 | } |
435 | ||
2e89db75 | 436 | static u32 mpsc_sdma_intr_mask(struct mpsc_port_info *pi, u32 mask) |
1da177e4 LT |
437 | { |
438 | u32 old, v; | |
439 | ||
440 | pr_debug("mpsc_sdma_intr_mask[%d]: mask: 0x%x\n", pi->port.line, mask); | |
441 | ||
442 | old = v = (pi->mirror_regs) ? pi->shared_regs->SDMA_INTR_MASK_m : | |
443 | readl(pi->shared_regs->sdma_intr_base + SDMA_INTR_MASK); | |
444 | ||
445 | mask &= 0xf; | |
446 | if (pi->port.line) | |
447 | mask <<= 8; | |
448 | v &= ~mask; | |
449 | ||
450 | if (pi->mirror_regs) | |
451 | pi->shared_regs->SDMA_INTR_MASK_m = v; | |
452 | writel(v, pi->shared_regs->sdma_intr_base + SDMA_INTR_MASK); | |
453 | ||
454 | if (pi->port.line) | |
455 | old >>= 8; | |
456 | return old & 0xf; | |
457 | } | |
458 | ||
2e89db75 | 459 | static void mpsc_sdma_intr_unmask(struct mpsc_port_info *pi, u32 mask) |
1da177e4 LT |
460 | { |
461 | u32 v; | |
462 | ||
463 | pr_debug("mpsc_sdma_intr_unmask[%d]: mask: 0x%x\n", pi->port.line,mask); | |
464 | ||
2e89db75 MG |
465 | v = (pi->mirror_regs) ? pi->shared_regs->SDMA_INTR_MASK_m |
466 | : readl(pi->shared_regs->sdma_intr_base + SDMA_INTR_MASK); | |
1da177e4 LT |
467 | |
468 | mask &= 0xf; | |
469 | if (pi->port.line) | |
470 | mask <<= 8; | |
471 | v |= mask; | |
472 | ||
473 | if (pi->mirror_regs) | |
474 | pi->shared_regs->SDMA_INTR_MASK_m = v; | |
475 | writel(v, pi->shared_regs->sdma_intr_base + SDMA_INTR_MASK); | |
1da177e4 LT |
476 | } |
477 | ||
2e89db75 | 478 | static void mpsc_sdma_intr_ack(struct mpsc_port_info *pi) |
1da177e4 LT |
479 | { |
480 | pr_debug("mpsc_sdma_intr_ack[%d]: Acknowledging IRQ\n", pi->port.line); | |
481 | ||
482 | if (pi->mirror_regs) | |
483 | pi->shared_regs->SDMA_INTR_CAUSE_m = 0; | |
2e89db75 MG |
484 | writeb(0x00, pi->shared_regs->sdma_intr_base + SDMA_INTR_CAUSE |
485 | + pi->port.line); | |
1da177e4 LT |
486 | } |
487 | ||
2e89db75 MG |
488 | static void mpsc_sdma_set_rx_ring(struct mpsc_port_info *pi, |
489 | struct mpsc_rx_desc *rxre_p) | |
1da177e4 LT |
490 | { |
491 | pr_debug("mpsc_sdma_set_rx_ring[%d]: rxre_p: 0x%x\n", | |
2e89db75 | 492 | pi->port.line, (u32)rxre_p); |
1da177e4 LT |
493 | |
494 | writel((u32)rxre_p, pi->sdma_base + SDMA_SCRDP); | |
1da177e4 LT |
495 | } |
496 | ||
2e89db75 MG |
497 | static void mpsc_sdma_set_tx_ring(struct mpsc_port_info *pi, |
498 | struct mpsc_tx_desc *txre_p) | |
1da177e4 LT |
499 | { |
500 | writel((u32)txre_p, pi->sdma_base + SDMA_SFTDP); | |
501 | writel((u32)txre_p, pi->sdma_base + SDMA_SCTDP); | |
1da177e4 LT |
502 | } |
503 | ||
2e89db75 | 504 | static void mpsc_sdma_cmd(struct mpsc_port_info *pi, u32 val) |
1da177e4 LT |
505 | { |
506 | u32 v; | |
507 | ||
508 | v = readl(pi->sdma_base + SDMA_SDCM); | |
509 | if (val) | |
510 | v |= val; | |
511 | else | |
512 | v = 0; | |
513 | wmb(); | |
514 | writel(v, pi->sdma_base + SDMA_SDCM); | |
515 | wmb(); | |
1da177e4 LT |
516 | } |
517 | ||
2e89db75 | 518 | static uint mpsc_sdma_tx_active(struct mpsc_port_info *pi) |
1da177e4 LT |
519 | { |
520 | return readl(pi->sdma_base + SDMA_SDCM) & SDMA_SDCM_TXD; | |
521 | } | |
522 | ||
2e89db75 | 523 | static void mpsc_sdma_start_tx(struct mpsc_port_info *pi) |
1da177e4 LT |
524 | { |
525 | struct mpsc_tx_desc *txre, *txre_p; | |
526 | ||
527 | /* If tx isn't running & there's a desc ready to go, start it */ | |
528 | if (!mpsc_sdma_tx_active(pi)) { | |
2e89db75 MG |
529 | txre = (struct mpsc_tx_desc *)(pi->txr |
530 | + (pi->txr_tail * MPSC_TXRE_SIZE)); | |
531 | dma_cache_sync(pi->port.dev, (void *)txre, MPSC_TXRE_SIZE, | |
532 | DMA_FROM_DEVICE); | |
1da177e4 LT |
533 | #if defined(CONFIG_PPC32) && !defined(CONFIG_NOT_COHERENT_CACHE) |
534 | if (pi->cache_mgmt) /* GT642[46]0 Res #COMM-2 */ | |
535 | invalidate_dcache_range((ulong)txre, | |
2e89db75 | 536 | (ulong)txre + MPSC_TXRE_SIZE); |
1da177e4 LT |
537 | #endif |
538 | ||
539 | if (be32_to_cpu(txre->cmdstat) & SDMA_DESC_CMDSTAT_O) { | |
2e89db75 MG |
540 | txre_p = (struct mpsc_tx_desc *) |
541 | (pi->txr_p + (pi->txr_tail * MPSC_TXRE_SIZE)); | |
1da177e4 LT |
542 | |
543 | mpsc_sdma_set_tx_ring(pi, txre_p); | |
544 | mpsc_sdma_cmd(pi, SDMA_SDCM_STD | SDMA_SDCM_TXD); | |
545 | } | |
546 | } | |
1da177e4 LT |
547 | } |
548 | ||
2e89db75 | 549 | static void mpsc_sdma_stop(struct mpsc_port_info *pi) |
1da177e4 LT |
550 | { |
551 | pr_debug("mpsc_sdma_stop[%d]: Stopping SDMA\n", pi->port.line); | |
552 | ||
553 | /* Abort any SDMA transfers */ | |
554 | mpsc_sdma_cmd(pi, 0); | |
555 | mpsc_sdma_cmd(pi, SDMA_SDCM_AR | SDMA_SDCM_AT); | |
556 | ||
557 | /* Clear the SDMA current and first TX and RX pointers */ | |
2c6e7599 AV |
558 | mpsc_sdma_set_tx_ring(pi, NULL); |
559 | mpsc_sdma_set_rx_ring(pi, NULL); | |
1da177e4 LT |
560 | |
561 | /* Disable interrupts */ | |
562 | mpsc_sdma_intr_mask(pi, 0xf); | |
563 | mpsc_sdma_intr_ack(pi); | |
1da177e4 LT |
564 | } |
565 | ||
566 | /* | |
567 | ****************************************************************************** | |
568 | * | |
569 | * Multi-Protocol Serial Controller Routines (MPSC) | |
570 | * | |
571 | ****************************************************************************** | |
572 | */ | |
573 | ||
2e89db75 | 574 | static void mpsc_hw_init(struct mpsc_port_info *pi) |
1da177e4 LT |
575 | { |
576 | u32 v; | |
577 | ||
578 | pr_debug("mpsc_hw_init[%d]: Initializing hardware\n", pi->port.line); | |
579 | ||
580 | /* Set up clock routing */ | |
581 | if (pi->mirror_regs) { | |
582 | v = pi->shared_regs->MPSC_MRR_m; | |
583 | v &= ~0x1c7; | |
584 | pi->shared_regs->MPSC_MRR_m = v; | |
585 | writel(v, pi->shared_regs->mpsc_routing_base + MPSC_MRR); | |
586 | ||
587 | v = pi->shared_regs->MPSC_RCRR_m; | |
588 | v = (v & ~0xf0f) | 0x100; | |
589 | pi->shared_regs->MPSC_RCRR_m = v; | |
590 | writel(v, pi->shared_regs->mpsc_routing_base + MPSC_RCRR); | |
591 | ||
592 | v = pi->shared_regs->MPSC_TCRR_m; | |
593 | v = (v & ~0xf0f) | 0x100; | |
594 | pi->shared_regs->MPSC_TCRR_m = v; | |
595 | writel(v, pi->shared_regs->mpsc_routing_base + MPSC_TCRR); | |
2e89db75 | 596 | } else { |
1da177e4 LT |
597 | v = readl(pi->shared_regs->mpsc_routing_base + MPSC_MRR); |
598 | v &= ~0x1c7; | |
599 | writel(v, pi->shared_regs->mpsc_routing_base + MPSC_MRR); | |
600 | ||
601 | v = readl(pi->shared_regs->mpsc_routing_base + MPSC_RCRR); | |
602 | v = (v & ~0xf0f) | 0x100; | |
603 | writel(v, pi->shared_regs->mpsc_routing_base + MPSC_RCRR); | |
604 | ||
605 | v = readl(pi->shared_regs->mpsc_routing_base + MPSC_TCRR); | |
606 | v = (v & ~0xf0f) | 0x100; | |
607 | writel(v, pi->shared_regs->mpsc_routing_base + MPSC_TCRR); | |
608 | } | |
609 | ||
610 | /* Put MPSC in UART mode & enabel Tx/Rx egines */ | |
611 | writel(0x000004c4, pi->mpsc_base + MPSC_MMCRL); | |
612 | ||
2e89db75 | 613 | /* No preamble, 16x divider, low-latency, */ |
1da177e4 LT |
614 | writel(0x04400400, pi->mpsc_base + MPSC_MMCRH); |
615 | ||
616 | if (pi->mirror_regs) { | |
617 | pi->MPSC_CHR_1_m = 0; | |
618 | pi->MPSC_CHR_2_m = 0; | |
619 | } | |
620 | writel(0, pi->mpsc_base + MPSC_CHR_1); | |
621 | writel(0, pi->mpsc_base + MPSC_CHR_2); | |
622 | writel(pi->mpsc_max_idle, pi->mpsc_base + MPSC_CHR_3); | |
623 | writel(0, pi->mpsc_base + MPSC_CHR_4); | |
624 | writel(0, pi->mpsc_base + MPSC_CHR_5); | |
625 | writel(0, pi->mpsc_base + MPSC_CHR_6); | |
626 | writel(0, pi->mpsc_base + MPSC_CHR_7); | |
627 | writel(0, pi->mpsc_base + MPSC_CHR_8); | |
628 | writel(0, pi->mpsc_base + MPSC_CHR_9); | |
629 | writel(0, pi->mpsc_base + MPSC_CHR_10); | |
1da177e4 LT |
630 | } |
631 | ||
2e89db75 | 632 | static void mpsc_enter_hunt(struct mpsc_port_info *pi) |
1da177e4 LT |
633 | { |
634 | pr_debug("mpsc_enter_hunt[%d]: Hunting...\n", pi->port.line); | |
635 | ||
636 | if (pi->mirror_regs) { | |
637 | writel(pi->MPSC_CHR_2_m | MPSC_CHR_2_EH, | |
638 | pi->mpsc_base + MPSC_CHR_2); | |
639 | /* Erratum prevents reading CHR_2 so just delay for a while */ | |
640 | udelay(100); | |
2e89db75 | 641 | } else { |
1da177e4 | 642 | writel(readl(pi->mpsc_base + MPSC_CHR_2) | MPSC_CHR_2_EH, |
2e89db75 | 643 | pi->mpsc_base + MPSC_CHR_2); |
1da177e4 LT |
644 | |
645 | while (readl(pi->mpsc_base + MPSC_CHR_2) & MPSC_CHR_2_EH) | |
646 | udelay(10); | |
647 | } | |
1da177e4 LT |
648 | } |
649 | ||
2e89db75 | 650 | static void mpsc_freeze(struct mpsc_port_info *pi) |
1da177e4 LT |
651 | { |
652 | u32 v; | |
653 | ||
654 | pr_debug("mpsc_freeze[%d]: Freezing\n", pi->port.line); | |
655 | ||
656 | v = (pi->mirror_regs) ? pi->MPSC_MPCR_m : | |
657 | readl(pi->mpsc_base + MPSC_MPCR); | |
658 | v |= MPSC_MPCR_FRZ; | |
659 | ||
660 | if (pi->mirror_regs) | |
661 | pi->MPSC_MPCR_m = v; | |
662 | writel(v, pi->mpsc_base + MPSC_MPCR); | |
1da177e4 LT |
663 | } |
664 | ||
2e89db75 | 665 | static void mpsc_unfreeze(struct mpsc_port_info *pi) |
1da177e4 LT |
666 | { |
667 | u32 v; | |
668 | ||
669 | v = (pi->mirror_regs) ? pi->MPSC_MPCR_m : | |
670 | readl(pi->mpsc_base + MPSC_MPCR); | |
671 | v &= ~MPSC_MPCR_FRZ; | |
672 | ||
673 | if (pi->mirror_regs) | |
674 | pi->MPSC_MPCR_m = v; | |
675 | writel(v, pi->mpsc_base + MPSC_MPCR); | |
676 | ||
677 | pr_debug("mpsc_unfreeze[%d]: Unfrozen\n", pi->port.line); | |
1da177e4 LT |
678 | } |
679 | ||
2e89db75 | 680 | static void mpsc_set_char_length(struct mpsc_port_info *pi, u32 len) |
1da177e4 LT |
681 | { |
682 | u32 v; | |
683 | ||
684 | pr_debug("mpsc_set_char_length[%d]: char len: %d\n", pi->port.line,len); | |
685 | ||
686 | v = (pi->mirror_regs) ? pi->MPSC_MPCR_m : | |
687 | readl(pi->mpsc_base + MPSC_MPCR); | |
688 | v = (v & ~(0x3 << 12)) | ((len & 0x3) << 12); | |
689 | ||
690 | if (pi->mirror_regs) | |
691 | pi->MPSC_MPCR_m = v; | |
692 | writel(v, pi->mpsc_base + MPSC_MPCR); | |
1da177e4 LT |
693 | } |
694 | ||
2e89db75 | 695 | static void mpsc_set_stop_bit_length(struct mpsc_port_info *pi, u32 len) |
1da177e4 LT |
696 | { |
697 | u32 v; | |
698 | ||
699 | pr_debug("mpsc_set_stop_bit_length[%d]: stop bits: %d\n", | |
700 | pi->port.line, len); | |
701 | ||
702 | v = (pi->mirror_regs) ? pi->MPSC_MPCR_m : | |
703 | readl(pi->mpsc_base + MPSC_MPCR); | |
704 | ||
705 | v = (v & ~(1 << 14)) | ((len & 0x1) << 14); | |
706 | ||
707 | if (pi->mirror_regs) | |
708 | pi->MPSC_MPCR_m = v; | |
709 | writel(v, pi->mpsc_base + MPSC_MPCR); | |
1da177e4 LT |
710 | } |
711 | ||
2e89db75 | 712 | static void mpsc_set_parity(struct mpsc_port_info *pi, u32 p) |
1da177e4 LT |
713 | { |
714 | u32 v; | |
715 | ||
716 | pr_debug("mpsc_set_parity[%d]: parity bits: 0x%x\n", pi->port.line, p); | |
717 | ||
718 | v = (pi->mirror_regs) ? pi->MPSC_CHR_2_m : | |
719 | readl(pi->mpsc_base + MPSC_CHR_2); | |
720 | ||
721 | p &= 0x3; | |
722 | v = (v & ~0xc000c) | (p << 18) | (p << 2); | |
723 | ||
724 | if (pi->mirror_regs) | |
725 | pi->MPSC_CHR_2_m = v; | |
726 | writel(v, pi->mpsc_base + MPSC_CHR_2); | |
1da177e4 LT |
727 | } |
728 | ||
729 | /* | |
730 | ****************************************************************************** | |
731 | * | |
732 | * Driver Init Routines | |
733 | * | |
734 | ****************************************************************************** | |
735 | */ | |
736 | ||
2e89db75 | 737 | static void mpsc_init_hw(struct mpsc_port_info *pi) |
1da177e4 LT |
738 | { |
739 | pr_debug("mpsc_init_hw[%d]: Initializing\n", pi->port.line); | |
740 | ||
741 | mpsc_brg_init(pi, pi->brg_clk_src); | |
742 | mpsc_brg_enable(pi); | |
743 | mpsc_sdma_init(pi, dma_get_cache_alignment()); /* burst a cacheline */ | |
744 | mpsc_sdma_stop(pi); | |
745 | mpsc_hw_init(pi); | |
1da177e4 LT |
746 | } |
747 | ||
2e89db75 | 748 | static int mpsc_alloc_ring_mem(struct mpsc_port_info *pi) |
1da177e4 LT |
749 | { |
750 | int rc = 0; | |
1da177e4 LT |
751 | |
752 | pr_debug("mpsc_alloc_ring_mem[%d]: Allocating ring mem\n", | |
753 | pi->port.line); | |
754 | ||
755 | if (!pi->dma_region) { | |
756 | if (!dma_supported(pi->port.dev, 0xffffffff)) { | |
757 | printk(KERN_ERR "MPSC: Inadequate DMA support\n"); | |
758 | rc = -ENXIO; | |
2e89db75 MG |
759 | } else if ((pi->dma_region = dma_alloc_noncoherent(pi->port.dev, |
760 | MPSC_DMA_ALLOC_SIZE, | |
761 | &pi->dma_region_p, GFP_KERNEL)) | |
762 | == NULL) { | |
1da177e4 LT |
763 | printk(KERN_ERR "MPSC: Can't alloc Desc region\n"); |
764 | rc = -ENOMEM; | |
765 | } | |
766 | } | |
767 | ||
768 | return rc; | |
769 | } | |
770 | ||
2e89db75 | 771 | static void mpsc_free_ring_mem(struct mpsc_port_info *pi) |
1da177e4 LT |
772 | { |
773 | pr_debug("mpsc_free_ring_mem[%d]: Freeing ring mem\n", pi->port.line); | |
774 | ||
775 | if (pi->dma_region) { | |
776 | dma_free_noncoherent(pi->port.dev, MPSC_DMA_ALLOC_SIZE, | |
2e89db75 | 777 | pi->dma_region, pi->dma_region_p); |
1da177e4 | 778 | pi->dma_region = NULL; |
2e89db75 | 779 | pi->dma_region_p = (dma_addr_t)NULL; |
1da177e4 | 780 | } |
1da177e4 LT |
781 | } |
782 | ||
2e89db75 | 783 | static void mpsc_init_rings(struct mpsc_port_info *pi) |
1da177e4 LT |
784 | { |
785 | struct mpsc_rx_desc *rxre; | |
786 | struct mpsc_tx_desc *txre; | |
787 | dma_addr_t dp, dp_p; | |
788 | u8 *bp, *bp_p; | |
789 | int i; | |
790 | ||
791 | pr_debug("mpsc_init_rings[%d]: Initializing rings\n", pi->port.line); | |
792 | ||
793 | BUG_ON(pi->dma_region == NULL); | |
794 | ||
795 | memset(pi->dma_region, 0, MPSC_DMA_ALLOC_SIZE); | |
796 | ||
797 | /* | |
798 | * Descriptors & buffers are multiples of cacheline size and must be | |
799 | * cacheline aligned. | |
800 | */ | |
2e89db75 MG |
801 | dp = ALIGN((u32)pi->dma_region, dma_get_cache_alignment()); |
802 | dp_p = ALIGN((u32)pi->dma_region_p, dma_get_cache_alignment()); | |
1da177e4 LT |
803 | |
804 | /* | |
805 | * Partition dma region into rx ring descriptor, rx buffers, | |
806 | * tx ring descriptors, and tx buffers. | |
807 | */ | |
808 | pi->rxr = dp; | |
809 | pi->rxr_p = dp_p; | |
810 | dp += MPSC_RXR_SIZE; | |
811 | dp_p += MPSC_RXR_SIZE; | |
812 | ||
2e89db75 MG |
813 | pi->rxb = (u8 *)dp; |
814 | pi->rxb_p = (u8 *)dp_p; | |
1da177e4 LT |
815 | dp += MPSC_RXB_SIZE; |
816 | dp_p += MPSC_RXB_SIZE; | |
817 | ||
818 | pi->rxr_posn = 0; | |
819 | ||
820 | pi->txr = dp; | |
821 | pi->txr_p = dp_p; | |
822 | dp += MPSC_TXR_SIZE; | |
823 | dp_p += MPSC_TXR_SIZE; | |
824 | ||
2e89db75 MG |
825 | pi->txb = (u8 *)dp; |
826 | pi->txb_p = (u8 *)dp_p; | |
1da177e4 LT |
827 | |
828 | pi->txr_head = 0; | |
829 | pi->txr_tail = 0; | |
830 | ||
831 | /* Init rx ring descriptors */ | |
832 | dp = pi->rxr; | |
833 | dp_p = pi->rxr_p; | |
834 | bp = pi->rxb; | |
835 | bp_p = pi->rxb_p; | |
836 | ||
837 | for (i = 0; i < MPSC_RXR_ENTRIES; i++) { | |
838 | rxre = (struct mpsc_rx_desc *)dp; | |
839 | ||
840 | rxre->bufsize = cpu_to_be16(MPSC_RXBE_SIZE); | |
841 | rxre->bytecnt = cpu_to_be16(0); | |
2e89db75 MG |
842 | rxre->cmdstat = cpu_to_be32(SDMA_DESC_CMDSTAT_O |
843 | | SDMA_DESC_CMDSTAT_EI | SDMA_DESC_CMDSTAT_F | |
844 | | SDMA_DESC_CMDSTAT_L); | |
1da177e4 LT |
845 | rxre->link = cpu_to_be32(dp_p + MPSC_RXRE_SIZE); |
846 | rxre->buf_ptr = cpu_to_be32(bp_p); | |
847 | ||
848 | dp += MPSC_RXRE_SIZE; | |
849 | dp_p += MPSC_RXRE_SIZE; | |
850 | bp += MPSC_RXBE_SIZE; | |
851 | bp_p += MPSC_RXBE_SIZE; | |
852 | } | |
853 | rxre->link = cpu_to_be32(pi->rxr_p); /* Wrap last back to first */ | |
854 | ||
855 | /* Init tx ring descriptors */ | |
856 | dp = pi->txr; | |
857 | dp_p = pi->txr_p; | |
858 | bp = pi->txb; | |
859 | bp_p = pi->txb_p; | |
860 | ||
861 | for (i = 0; i < MPSC_TXR_ENTRIES; i++) { | |
862 | txre = (struct mpsc_tx_desc *)dp; | |
863 | ||
864 | txre->link = cpu_to_be32(dp_p + MPSC_TXRE_SIZE); | |
865 | txre->buf_ptr = cpu_to_be32(bp_p); | |
866 | ||
867 | dp += MPSC_TXRE_SIZE; | |
868 | dp_p += MPSC_TXRE_SIZE; | |
869 | bp += MPSC_TXBE_SIZE; | |
870 | bp_p += MPSC_TXBE_SIZE; | |
871 | } | |
872 | txre->link = cpu_to_be32(pi->txr_p); /* Wrap last back to first */ | |
873 | ||
2e89db75 MG |
874 | dma_cache_sync(pi->port.dev, (void *)pi->dma_region, |
875 | MPSC_DMA_ALLOC_SIZE, DMA_BIDIRECTIONAL); | |
1da177e4 LT |
876 | #if defined(CONFIG_PPC32) && !defined(CONFIG_NOT_COHERENT_CACHE) |
877 | if (pi->cache_mgmt) /* GT642[46]0 Res #COMM-2 */ | |
878 | flush_dcache_range((ulong)pi->dma_region, | |
2e89db75 MG |
879 | (ulong)pi->dma_region |
880 | + MPSC_DMA_ALLOC_SIZE); | |
1da177e4 LT |
881 | #endif |
882 | ||
883 | return; | |
884 | } | |
885 | ||
2e89db75 | 886 | static void mpsc_uninit_rings(struct mpsc_port_info *pi) |
1da177e4 LT |
887 | { |
888 | pr_debug("mpsc_uninit_rings[%d]: Uninitializing rings\n",pi->port.line); | |
889 | ||
890 | BUG_ON(pi->dma_region == NULL); | |
891 | ||
892 | pi->rxr = 0; | |
893 | pi->rxr_p = 0; | |
894 | pi->rxb = NULL; | |
895 | pi->rxb_p = NULL; | |
896 | pi->rxr_posn = 0; | |
897 | ||
898 | pi->txr = 0; | |
899 | pi->txr_p = 0; | |
900 | pi->txb = NULL; | |
901 | pi->txb_p = NULL; | |
902 | pi->txr_head = 0; | |
903 | pi->txr_tail = 0; | |
1da177e4 LT |
904 | } |
905 | ||
2e89db75 | 906 | static int mpsc_make_ready(struct mpsc_port_info *pi) |
1da177e4 LT |
907 | { |
908 | int rc; | |
909 | ||
910 | pr_debug("mpsc_make_ready[%d]: Making cltr ready\n", pi->port.line); | |
911 | ||
912 | if (!pi->ready) { | |
913 | mpsc_init_hw(pi); | |
914 | if ((rc = mpsc_alloc_ring_mem(pi))) | |
915 | return rc; | |
916 | mpsc_init_rings(pi); | |
917 | pi->ready = 1; | |
918 | } | |
919 | ||
920 | return 0; | |
921 | } | |
922 | ||
923 | /* | |
924 | ****************************************************************************** | |
925 | * | |
926 | * Interrupt Handling Routines | |
927 | * | |
928 | ****************************************************************************** | |
929 | */ | |
930 | ||
2e89db75 | 931 | static int mpsc_rx_intr(struct mpsc_port_info *pi) |
1da177e4 LT |
932 | { |
933 | struct mpsc_rx_desc *rxre; | |
934 | struct tty_struct *tty = pi->port.info->tty; | |
935 | u32 cmdstat, bytes_in, i; | |
936 | int rc = 0; | |
937 | u8 *bp; | |
938 | char flag = TTY_NORMAL; | |
1da177e4 LT |
939 | |
940 | pr_debug("mpsc_rx_intr[%d]: Handling Rx intr\n", pi->port.line); | |
941 | ||
942 | rxre = (struct mpsc_rx_desc *)(pi->rxr + (pi->rxr_posn*MPSC_RXRE_SIZE)); | |
943 | ||
2e89db75 MG |
944 | dma_cache_sync(pi->port.dev, (void *)rxre, MPSC_RXRE_SIZE, |
945 | DMA_FROM_DEVICE); | |
1da177e4 LT |
946 | #if defined(CONFIG_PPC32) && !defined(CONFIG_NOT_COHERENT_CACHE) |
947 | if (pi->cache_mgmt) /* GT642[46]0 Res #COMM-2 */ | |
948 | invalidate_dcache_range((ulong)rxre, | |
2e89db75 | 949 | (ulong)rxre + MPSC_RXRE_SIZE); |
1da177e4 LT |
950 | #endif |
951 | ||
952 | /* | |
953 | * Loop through Rx descriptors handling ones that have been completed. | |
954 | */ | |
2e89db75 MG |
955 | while (!((cmdstat = be32_to_cpu(rxre->cmdstat)) |
956 | & SDMA_DESC_CMDSTAT_O)) { | |
1da177e4 LT |
957 | bytes_in = be16_to_cpu(rxre->bytecnt); |
958 | ||
959 | /* Following use of tty struct directly is deprecated */ | |
2e89db75 MG |
960 | if (unlikely(tty_buffer_request_room(tty, bytes_in) |
961 | < bytes_in)) { | |
1da177e4 LT |
962 | if (tty->low_latency) |
963 | tty_flip_buffer_push(tty); | |
964 | /* | |
33f0f88f AC |
965 | * If this failed then we will throw away the bytes |
966 | * but must do so to clear interrupts. | |
1da177e4 LT |
967 | */ |
968 | } | |
969 | ||
970 | bp = pi->rxb + (pi->rxr_posn * MPSC_RXBE_SIZE); | |
2e89db75 MG |
971 | dma_cache_sync(pi->port.dev, (void *)bp, MPSC_RXBE_SIZE, |
972 | DMA_FROM_DEVICE); | |
1da177e4 LT |
973 | #if defined(CONFIG_PPC32) && !defined(CONFIG_NOT_COHERENT_CACHE) |
974 | if (pi->cache_mgmt) /* GT642[46]0 Res #COMM-2 */ | |
975 | invalidate_dcache_range((ulong)bp, | |
2e89db75 | 976 | (ulong)bp + MPSC_RXBE_SIZE); |
1da177e4 LT |
977 | #endif |
978 | ||
979 | /* | |
980 | * Other than for parity error, the manual provides little | |
981 | * info on what data will be in a frame flagged by any of | |
982 | * these errors. For parity error, it is the last byte in | |
983 | * the buffer that had the error. As for the rest, I guess | |
984 | * we'll assume there is no data in the buffer. | |
985 | * If there is...it gets lost. | |
986 | */ | |
2e89db75 MG |
987 | if (unlikely(cmdstat & (SDMA_DESC_CMDSTAT_BR |
988 | | SDMA_DESC_CMDSTAT_FR | |
989 | | SDMA_DESC_CMDSTAT_OR))) { | |
1da177e4 LT |
990 | |
991 | pi->port.icount.rx++; | |
992 | ||
993 | if (cmdstat & SDMA_DESC_CMDSTAT_BR) { /* Break */ | |
994 | pi->port.icount.brk++; | |
995 | ||
996 | if (uart_handle_break(&pi->port)) | |
997 | goto next_frame; | |
2e89db75 | 998 | } else if (cmdstat & SDMA_DESC_CMDSTAT_FR) { |
1da177e4 | 999 | pi->port.icount.frame++; |
2e89db75 | 1000 | } else if (cmdstat & SDMA_DESC_CMDSTAT_OR) { |
1da177e4 | 1001 | pi->port.icount.overrun++; |
2e89db75 | 1002 | } |
1da177e4 LT |
1003 | |
1004 | cmdstat &= pi->port.read_status_mask; | |
1005 | ||
1006 | if (cmdstat & SDMA_DESC_CMDSTAT_BR) | |
1007 | flag = TTY_BREAK; | |
1008 | else if (cmdstat & SDMA_DESC_CMDSTAT_FR) | |
1009 | flag = TTY_FRAME; | |
1010 | else if (cmdstat & SDMA_DESC_CMDSTAT_OR) | |
1011 | flag = TTY_OVERRUN; | |
1012 | else if (cmdstat & SDMA_DESC_CMDSTAT_PE) | |
1013 | flag = TTY_PARITY; | |
1014 | } | |
1015 | ||
7d12e780 | 1016 | if (uart_handle_sysrq_char(&pi->port, *bp)) { |
1da177e4 LT |
1017 | bp++; |
1018 | bytes_in--; | |
1019 | goto next_frame; | |
1020 | } | |
1021 | ||
2e89db75 MG |
1022 | if ((unlikely(cmdstat & (SDMA_DESC_CMDSTAT_BR |
1023 | | SDMA_DESC_CMDSTAT_FR | |
1024 | | SDMA_DESC_CMDSTAT_OR))) | |
1025 | && !(cmdstat & pi->port.ignore_status_mask)) { | |
1da177e4 | 1026 | tty_insert_flip_char(tty, *bp, flag); |
2e89db75 | 1027 | } else { |
1da177e4 LT |
1028 | for (i=0; i<bytes_in; i++) |
1029 | tty_insert_flip_char(tty, *bp++, TTY_NORMAL); | |
1030 | ||
1031 | pi->port.icount.rx += bytes_in; | |
1032 | } | |
1033 | ||
1034 | next_frame: | |
1035 | rxre->bytecnt = cpu_to_be16(0); | |
1036 | wmb(); | |
2e89db75 MG |
1037 | rxre->cmdstat = cpu_to_be32(SDMA_DESC_CMDSTAT_O |
1038 | | SDMA_DESC_CMDSTAT_EI | SDMA_DESC_CMDSTAT_F | |
1039 | | SDMA_DESC_CMDSTAT_L); | |
1da177e4 | 1040 | wmb(); |
2e89db75 MG |
1041 | dma_cache_sync(pi->port.dev, (void *)rxre, MPSC_RXRE_SIZE, |
1042 | DMA_BIDIRECTIONAL); | |
1da177e4 LT |
1043 | #if defined(CONFIG_PPC32) && !defined(CONFIG_NOT_COHERENT_CACHE) |
1044 | if (pi->cache_mgmt) /* GT642[46]0 Res #COMM-2 */ | |
1045 | flush_dcache_range((ulong)rxre, | |
2e89db75 | 1046 | (ulong)rxre + MPSC_RXRE_SIZE); |
1da177e4 LT |
1047 | #endif |
1048 | ||
1049 | /* Advance to next descriptor */ | |
1050 | pi->rxr_posn = (pi->rxr_posn + 1) & (MPSC_RXR_ENTRIES - 1); | |
2e89db75 MG |
1051 | rxre = (struct mpsc_rx_desc *) |
1052 | (pi->rxr + (pi->rxr_posn * MPSC_RXRE_SIZE)); | |
1053 | dma_cache_sync(pi->port.dev, (void *)rxre, MPSC_RXRE_SIZE, | |
1054 | DMA_FROM_DEVICE); | |
1da177e4 LT |
1055 | #if defined(CONFIG_PPC32) && !defined(CONFIG_NOT_COHERENT_CACHE) |
1056 | if (pi->cache_mgmt) /* GT642[46]0 Res #COMM-2 */ | |
1057 | invalidate_dcache_range((ulong)rxre, | |
2e89db75 | 1058 | (ulong)rxre + MPSC_RXRE_SIZE); |
1da177e4 | 1059 | #endif |
1da177e4 LT |
1060 | rc = 1; |
1061 | } | |
1062 | ||
1063 | /* Restart rx engine, if its stopped */ | |
1064 | if ((readl(pi->sdma_base + SDMA_SDCM) & SDMA_SDCM_ERD) == 0) | |
1065 | mpsc_start_rx(pi); | |
1066 | ||
1067 | tty_flip_buffer_push(tty); | |
1068 | return rc; | |
1069 | } | |
1070 | ||
2e89db75 | 1071 | static void mpsc_setup_tx_desc(struct mpsc_port_info *pi, u32 count, u32 intr) |
1da177e4 LT |
1072 | { |
1073 | struct mpsc_tx_desc *txre; | |
1074 | ||
2e89db75 MG |
1075 | txre = (struct mpsc_tx_desc *)(pi->txr |
1076 | + (pi->txr_head * MPSC_TXRE_SIZE)); | |
1da177e4 LT |
1077 | |
1078 | txre->bytecnt = cpu_to_be16(count); | |
1079 | txre->shadow = txre->bytecnt; | |
1080 | wmb(); /* ensure cmdstat is last field updated */ | |
2e89db75 MG |
1081 | txre->cmdstat = cpu_to_be32(SDMA_DESC_CMDSTAT_O | SDMA_DESC_CMDSTAT_F |
1082 | | SDMA_DESC_CMDSTAT_L | |
1083 | | ((intr) ? SDMA_DESC_CMDSTAT_EI : 0)); | |
1da177e4 | 1084 | wmb(); |
2e89db75 MG |
1085 | dma_cache_sync(pi->port.dev, (void *)txre, MPSC_TXRE_SIZE, |
1086 | DMA_BIDIRECTIONAL); | |
1da177e4 LT |
1087 | #if defined(CONFIG_PPC32) && !defined(CONFIG_NOT_COHERENT_CACHE) |
1088 | if (pi->cache_mgmt) /* GT642[46]0 Res #COMM-2 */ | |
1089 | flush_dcache_range((ulong)txre, | |
2e89db75 | 1090 | (ulong)txre + MPSC_TXRE_SIZE); |
1da177e4 | 1091 | #endif |
1da177e4 LT |
1092 | } |
1093 | ||
2e89db75 | 1094 | static void mpsc_copy_tx_data(struct mpsc_port_info *pi) |
1da177e4 LT |
1095 | { |
1096 | struct circ_buf *xmit = &pi->port.info->xmit; | |
1097 | u8 *bp; | |
1098 | u32 i; | |
1099 | ||
1100 | /* Make sure the desc ring isn't full */ | |
2e89db75 MG |
1101 | while (CIRC_CNT(pi->txr_head, pi->txr_tail, MPSC_TXR_ENTRIES) |
1102 | < (MPSC_TXR_ENTRIES - 1)) { | |
1da177e4 LT |
1103 | if (pi->port.x_char) { |
1104 | /* | |
1105 | * Ideally, we should use the TCS field in | |
1106 | * CHR_1 to put the x_char out immediately but | |
1107 | * errata prevents us from being able to read | |
1108 | * CHR_2 to know that its safe to write to | |
1109 | * CHR_1. Instead, just put it in-band with | |
1110 | * all the other Tx data. | |
1111 | */ | |
1112 | bp = pi->txb + (pi->txr_head * MPSC_TXBE_SIZE); | |
1113 | *bp = pi->port.x_char; | |
1114 | pi->port.x_char = 0; | |
1115 | i = 1; | |
2e89db75 MG |
1116 | } else if (!uart_circ_empty(xmit) |
1117 | && !uart_tx_stopped(&pi->port)) { | |
1118 | i = min((u32)MPSC_TXBE_SIZE, | |
1119 | (u32)uart_circ_chars_pending(xmit)); | |
1120 | i = min(i, (u32)CIRC_CNT_TO_END(xmit->head, xmit->tail, | |
1da177e4 LT |
1121 | UART_XMIT_SIZE)); |
1122 | bp = pi->txb + (pi->txr_head * MPSC_TXBE_SIZE); | |
1123 | memcpy(bp, &xmit->buf[xmit->tail], i); | |
1124 | xmit->tail = (xmit->tail + i) & (UART_XMIT_SIZE - 1); | |
1125 | ||
1126 | if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS) | |
1127 | uart_write_wakeup(&pi->port); | |
2e89db75 | 1128 | } else { /* All tx data copied into ring bufs */ |
1da177e4 | 1129 | return; |
2e89db75 | 1130 | } |
1da177e4 | 1131 | |
2e89db75 MG |
1132 | dma_cache_sync(pi->port.dev, (void *)bp, MPSC_TXBE_SIZE, |
1133 | DMA_BIDIRECTIONAL); | |
1da177e4 LT |
1134 | #if defined(CONFIG_PPC32) && !defined(CONFIG_NOT_COHERENT_CACHE) |
1135 | if (pi->cache_mgmt) /* GT642[46]0 Res #COMM-2 */ | |
1136 | flush_dcache_range((ulong)bp, | |
2e89db75 | 1137 | (ulong)bp + MPSC_TXBE_SIZE); |
1da177e4 LT |
1138 | #endif |
1139 | mpsc_setup_tx_desc(pi, i, 1); | |
1140 | ||
1141 | /* Advance to next descriptor */ | |
1142 | pi->txr_head = (pi->txr_head + 1) & (MPSC_TXR_ENTRIES - 1); | |
1143 | } | |
1da177e4 LT |
1144 | } |
1145 | ||
2e89db75 | 1146 | static int mpsc_tx_intr(struct mpsc_port_info *pi) |
1da177e4 LT |
1147 | { |
1148 | struct mpsc_tx_desc *txre; | |
1149 | int rc = 0; | |
1733310b DJ |
1150 | unsigned long iflags; |
1151 | ||
1152 | spin_lock_irqsave(&pi->tx_lock, iflags); | |
1da177e4 LT |
1153 | |
1154 | if (!mpsc_sdma_tx_active(pi)) { | |
2e89db75 MG |
1155 | txre = (struct mpsc_tx_desc *)(pi->txr |
1156 | + (pi->txr_tail * MPSC_TXRE_SIZE)); | |
1da177e4 | 1157 | |
2e89db75 MG |
1158 | dma_cache_sync(pi->port.dev, (void *)txre, MPSC_TXRE_SIZE, |
1159 | DMA_FROM_DEVICE); | |
1da177e4 LT |
1160 | #if defined(CONFIG_PPC32) && !defined(CONFIG_NOT_COHERENT_CACHE) |
1161 | if (pi->cache_mgmt) /* GT642[46]0 Res #COMM-2 */ | |
1162 | invalidate_dcache_range((ulong)txre, | |
2e89db75 | 1163 | (ulong)txre + MPSC_TXRE_SIZE); |
1da177e4 LT |
1164 | #endif |
1165 | ||
1166 | while (!(be32_to_cpu(txre->cmdstat) & SDMA_DESC_CMDSTAT_O)) { | |
1167 | rc = 1; | |
1168 | pi->port.icount.tx += be16_to_cpu(txre->bytecnt); | |
1169 | pi->txr_tail = (pi->txr_tail+1) & (MPSC_TXR_ENTRIES-1); | |
1170 | ||
1171 | /* If no more data to tx, fall out of loop */ | |
1172 | if (pi->txr_head == pi->txr_tail) | |
1173 | break; | |
1174 | ||
2e89db75 MG |
1175 | txre = (struct mpsc_tx_desc *)(pi->txr |
1176 | + (pi->txr_tail * MPSC_TXRE_SIZE)); | |
1177 | dma_cache_sync(pi->port.dev, (void *)txre, | |
1178 | MPSC_TXRE_SIZE, DMA_FROM_DEVICE); | |
1da177e4 LT |
1179 | #if defined(CONFIG_PPC32) && !defined(CONFIG_NOT_COHERENT_CACHE) |
1180 | if (pi->cache_mgmt) /* GT642[46]0 Res #COMM-2 */ | |
1181 | invalidate_dcache_range((ulong)txre, | |
2e89db75 | 1182 | (ulong)txre + MPSC_TXRE_SIZE); |
1da177e4 LT |
1183 | #endif |
1184 | } | |
1185 | ||
1186 | mpsc_copy_tx_data(pi); | |
1187 | mpsc_sdma_start_tx(pi); /* start next desc if ready */ | |
1188 | } | |
1189 | ||
1733310b | 1190 | spin_unlock_irqrestore(&pi->tx_lock, iflags); |
1da177e4 LT |
1191 | return rc; |
1192 | } | |
1193 | ||
1194 | /* | |
1195 | * This is the driver's interrupt handler. To avoid a race, we first clear | |
1196 | * the interrupt, then handle any completed Rx/Tx descriptors. When done | |
1197 | * handling those descriptors, we restart the Rx/Tx engines if they're stopped. | |
1198 | */ | |
2e89db75 | 1199 | static irqreturn_t mpsc_sdma_intr(int irq, void *dev_id) |
1da177e4 LT |
1200 | { |
1201 | struct mpsc_port_info *pi = dev_id; | |
1202 | ulong iflags; | |
1203 | int rc = IRQ_NONE; | |
1204 | ||
1205 | pr_debug("mpsc_sdma_intr[%d]: SDMA Interrupt Received\n",pi->port.line); | |
1206 | ||
1207 | spin_lock_irqsave(&pi->port.lock, iflags); | |
1208 | mpsc_sdma_intr_ack(pi); | |
7d12e780 | 1209 | if (mpsc_rx_intr(pi)) |
1da177e4 LT |
1210 | rc = IRQ_HANDLED; |
1211 | if (mpsc_tx_intr(pi)) | |
1212 | rc = IRQ_HANDLED; | |
1213 | spin_unlock_irqrestore(&pi->port.lock, iflags); | |
1214 | ||
1215 | pr_debug("mpsc_sdma_intr[%d]: SDMA Interrupt Handled\n", pi->port.line); | |
1216 | return rc; | |
1217 | } | |
1218 | ||
1219 | /* | |
1220 | ****************************************************************************** | |
1221 | * | |
1222 | * serial_core.c Interface routines | |
1223 | * | |
1224 | ****************************************************************************** | |
1225 | */ | |
2e89db75 | 1226 | static uint mpsc_tx_empty(struct uart_port *port) |
1da177e4 LT |
1227 | { |
1228 | struct mpsc_port_info *pi = (struct mpsc_port_info *)port; | |
1229 | ulong iflags; | |
1230 | uint rc; | |
1231 | ||
1232 | spin_lock_irqsave(&pi->port.lock, iflags); | |
1233 | rc = mpsc_sdma_tx_active(pi) ? 0 : TIOCSER_TEMT; | |
1234 | spin_unlock_irqrestore(&pi->port.lock, iflags); | |
1235 | ||
1236 | return rc; | |
1237 | } | |
1238 | ||
2e89db75 | 1239 | static void mpsc_set_mctrl(struct uart_port *port, uint mctrl) |
1da177e4 LT |
1240 | { |
1241 | /* Have no way to set modem control lines AFAICT */ | |
1da177e4 LT |
1242 | } |
1243 | ||
2e89db75 | 1244 | static uint mpsc_get_mctrl(struct uart_port *port) |
1da177e4 LT |
1245 | { |
1246 | struct mpsc_port_info *pi = (struct mpsc_port_info *)port; | |
1247 | u32 mflags, status; | |
1da177e4 | 1248 | |
2e89db75 MG |
1249 | status = (pi->mirror_regs) ? pi->MPSC_CHR_10_m |
1250 | : readl(pi->mpsc_base + MPSC_CHR_10); | |
1da177e4 LT |
1251 | |
1252 | mflags = 0; | |
1253 | if (status & 0x1) | |
1254 | mflags |= TIOCM_CTS; | |
1255 | if (status & 0x2) | |
1256 | mflags |= TIOCM_CAR; | |
1257 | ||
1258 | return mflags | TIOCM_DSR; /* No way to tell if DSR asserted */ | |
1259 | } | |
1260 | ||
2e89db75 | 1261 | static void mpsc_stop_tx(struct uart_port *port) |
1da177e4 LT |
1262 | { |
1263 | struct mpsc_port_info *pi = (struct mpsc_port_info *)port; | |
1264 | ||
b129a8cc | 1265 | pr_debug("mpsc_stop_tx[%d]\n", port->line); |
1da177e4 LT |
1266 | |
1267 | mpsc_freeze(pi); | |
1da177e4 LT |
1268 | } |
1269 | ||
2e89db75 | 1270 | static void mpsc_start_tx(struct uart_port *port) |
1da177e4 LT |
1271 | { |
1272 | struct mpsc_port_info *pi = (struct mpsc_port_info *)port; | |
1733310b DJ |
1273 | unsigned long iflags; |
1274 | ||
1275 | spin_lock_irqsave(&pi->tx_lock, iflags); | |
1da177e4 LT |
1276 | |
1277 | mpsc_unfreeze(pi); | |
1278 | mpsc_copy_tx_data(pi); | |
1279 | mpsc_sdma_start_tx(pi); | |
1280 | ||
1733310b DJ |
1281 | spin_unlock_irqrestore(&pi->tx_lock, iflags); |
1282 | ||
b129a8cc | 1283 | pr_debug("mpsc_start_tx[%d]\n", port->line); |
1da177e4 LT |
1284 | } |
1285 | ||
2e89db75 | 1286 | static void mpsc_start_rx(struct mpsc_port_info *pi) |
1da177e4 LT |
1287 | { |
1288 | pr_debug("mpsc_start_rx[%d]: Starting...\n", pi->port.line); | |
1289 | ||
1290 | if (pi->rcv_data) { | |
1291 | mpsc_enter_hunt(pi); | |
1292 | mpsc_sdma_cmd(pi, SDMA_SDCM_ERD); | |
1293 | } | |
1da177e4 LT |
1294 | } |
1295 | ||
2e89db75 | 1296 | static void mpsc_stop_rx(struct uart_port *port) |
1da177e4 LT |
1297 | { |
1298 | struct mpsc_port_info *pi = (struct mpsc_port_info *)port; | |
1299 | ||
1300 | pr_debug("mpsc_stop_rx[%d]: Stopping...\n", port->line); | |
1301 | ||
6c1ead5e CS |
1302 | if (pi->mirror_regs) { |
1303 | writel(pi->MPSC_CHR_2_m | MPSC_CHR_2_RA, | |
1304 | pi->mpsc_base + MPSC_CHR_2); | |
1305 | /* Erratum prevents reading CHR_2 so just delay for a while */ | |
1306 | udelay(100); | |
2e89db75 | 1307 | } else { |
6c1ead5e | 1308 | writel(readl(pi->mpsc_base + MPSC_CHR_2) | MPSC_CHR_2_RA, |
2e89db75 | 1309 | pi->mpsc_base + MPSC_CHR_2); |
6c1ead5e CS |
1310 | |
1311 | while (readl(pi->mpsc_base + MPSC_CHR_2) & MPSC_CHR_2_RA) | |
1312 | udelay(10); | |
1313 | } | |
1314 | ||
1da177e4 | 1315 | mpsc_sdma_cmd(pi, SDMA_SDCM_AR); |
1da177e4 LT |
1316 | } |
1317 | ||
2e89db75 | 1318 | static void mpsc_enable_ms(struct uart_port *port) |
1da177e4 | 1319 | { |
1da177e4 LT |
1320 | } |
1321 | ||
2e89db75 | 1322 | static void mpsc_break_ctl(struct uart_port *port, int ctl) |
1da177e4 LT |
1323 | { |
1324 | struct mpsc_port_info *pi = (struct mpsc_port_info *)port; | |
1325 | ulong flags; | |
1326 | u32 v; | |
1327 | ||
1328 | v = ctl ? 0x00ff0000 : 0; | |
1329 | ||
1330 | spin_lock_irqsave(&pi->port.lock, flags); | |
1331 | if (pi->mirror_regs) | |
1332 | pi->MPSC_CHR_1_m = v; | |
1333 | writel(v, pi->mpsc_base + MPSC_CHR_1); | |
1334 | spin_unlock_irqrestore(&pi->port.lock, flags); | |
1da177e4 LT |
1335 | } |
1336 | ||
2e89db75 | 1337 | static int mpsc_startup(struct uart_port *port) |
1da177e4 LT |
1338 | { |
1339 | struct mpsc_port_info *pi = (struct mpsc_port_info *)port; | |
1340 | u32 flag = 0; | |
1341 | int rc; | |
1342 | ||
1343 | pr_debug("mpsc_startup[%d]: Starting up MPSC, irq: %d\n", | |
1344 | port->line, pi->port.irq); | |
1345 | ||
1346 | if ((rc = mpsc_make_ready(pi)) == 0) { | |
1347 | /* Setup IRQ handler */ | |
1348 | mpsc_sdma_intr_ack(pi); | |
1349 | ||
1350 | /* If irq's are shared, need to set flag */ | |
1351 | if (mpsc_ports[0].port.irq == mpsc_ports[1].port.irq) | |
40663cc7 | 1352 | flag = IRQF_SHARED; |
1da177e4 LT |
1353 | |
1354 | if (request_irq(pi->port.irq, mpsc_sdma_intr, flag, | |
2e89db75 | 1355 | "mpsc-sdma", pi)) |
1da177e4 | 1356 | printk(KERN_ERR "MPSC: Can't get SDMA IRQ %d\n", |
2e89db75 | 1357 | pi->port.irq); |
1da177e4 LT |
1358 | |
1359 | mpsc_sdma_intr_unmask(pi, 0xf); | |
2e89db75 MG |
1360 | mpsc_sdma_set_rx_ring(pi, (struct mpsc_rx_desc *)(pi->rxr_p |
1361 | + (pi->rxr_posn * MPSC_RXRE_SIZE))); | |
1da177e4 LT |
1362 | } |
1363 | ||
1364 | return rc; | |
1365 | } | |
1366 | ||
2e89db75 | 1367 | static void mpsc_shutdown(struct uart_port *port) |
1da177e4 LT |
1368 | { |
1369 | struct mpsc_port_info *pi = (struct mpsc_port_info *)port; | |
1da177e4 LT |
1370 | |
1371 | pr_debug("mpsc_shutdown[%d]: Shutting down MPSC\n", port->line); | |
1372 | ||
1373 | mpsc_sdma_stop(pi); | |
1374 | free_irq(pi->port.irq, pi); | |
1da177e4 LT |
1375 | } |
1376 | ||
2e89db75 | 1377 | static void mpsc_set_termios(struct uart_port *port, struct ktermios *termios, |
606d099c | 1378 | struct ktermios *old) |
1da177e4 LT |
1379 | { |
1380 | struct mpsc_port_info *pi = (struct mpsc_port_info *)port; | |
1381 | u32 baud; | |
1382 | ulong flags; | |
1383 | u32 chr_bits, stop_bits, par; | |
1384 | ||
1385 | pi->c_iflag = termios->c_iflag; | |
1386 | pi->c_cflag = termios->c_cflag; | |
1387 | ||
1388 | switch (termios->c_cflag & CSIZE) { | |
1389 | case CS5: | |
1390 | chr_bits = MPSC_MPCR_CL_5; | |
1391 | break; | |
1392 | case CS6: | |
1393 | chr_bits = MPSC_MPCR_CL_6; | |
1394 | break; | |
1395 | case CS7: | |
1396 | chr_bits = MPSC_MPCR_CL_7; | |
1397 | break; | |
1398 | case CS8: | |
1399 | default: | |
1400 | chr_bits = MPSC_MPCR_CL_8; | |
1401 | break; | |
1402 | } | |
1403 | ||
1404 | if (termios->c_cflag & CSTOPB) | |
1405 | stop_bits = MPSC_MPCR_SBL_2; | |
1406 | else | |
1407 | stop_bits = MPSC_MPCR_SBL_1; | |
1408 | ||
1409 | par = MPSC_CHR_2_PAR_EVEN; | |
1410 | if (termios->c_cflag & PARENB) | |
1411 | if (termios->c_cflag & PARODD) | |
1412 | par = MPSC_CHR_2_PAR_ODD; | |
1413 | #ifdef CMSPAR | |
1414 | if (termios->c_cflag & CMSPAR) { | |
1415 | if (termios->c_cflag & PARODD) | |
1416 | par = MPSC_CHR_2_PAR_MARK; | |
1417 | else | |
1418 | par = MPSC_CHR_2_PAR_SPACE; | |
1419 | } | |
1420 | #endif | |
1421 | ||
1422 | baud = uart_get_baud_rate(port, termios, old, 0, port->uartclk); | |
1423 | ||
1424 | spin_lock_irqsave(&pi->port.lock, flags); | |
1425 | ||
1426 | uart_update_timeout(port, termios->c_cflag, baud); | |
1427 | ||
1428 | mpsc_set_char_length(pi, chr_bits); | |
1429 | mpsc_set_stop_bit_length(pi, stop_bits); | |
1430 | mpsc_set_parity(pi, par); | |
1431 | mpsc_set_baudrate(pi, baud); | |
1432 | ||
1433 | /* Characters/events to read */ | |
1da177e4 LT |
1434 | pi->port.read_status_mask = SDMA_DESC_CMDSTAT_OR; |
1435 | ||
1436 | if (termios->c_iflag & INPCK) | |
2e89db75 MG |
1437 | pi->port.read_status_mask |= SDMA_DESC_CMDSTAT_PE |
1438 | | SDMA_DESC_CMDSTAT_FR; | |
1da177e4 LT |
1439 | |
1440 | if (termios->c_iflag & (BRKINT | PARMRK)) | |
1441 | pi->port.read_status_mask |= SDMA_DESC_CMDSTAT_BR; | |
1442 | ||
1443 | /* Characters/events to ignore */ | |
1444 | pi->port.ignore_status_mask = 0; | |
1445 | ||
1446 | if (termios->c_iflag & IGNPAR) | |
2e89db75 MG |
1447 | pi->port.ignore_status_mask |= SDMA_DESC_CMDSTAT_PE |
1448 | | SDMA_DESC_CMDSTAT_FR; | |
1da177e4 LT |
1449 | |
1450 | if (termios->c_iflag & IGNBRK) { | |
1451 | pi->port.ignore_status_mask |= SDMA_DESC_CMDSTAT_BR; | |
1452 | ||
1453 | if (termios->c_iflag & IGNPAR) | |
1454 | pi->port.ignore_status_mask |= SDMA_DESC_CMDSTAT_OR; | |
1455 | } | |
1456 | ||
5797ae36 SC |
1457 | if ((termios->c_cflag & CREAD)) { |
1458 | if (!pi->rcv_data) { | |
1459 | pi->rcv_data = 1; | |
1460 | mpsc_start_rx(pi); | |
1461 | } | |
1462 | } else if (pi->rcv_data) { | |
1463 | mpsc_stop_rx(port); | |
1da177e4 | 1464 | pi->rcv_data = 0; |
5797ae36 | 1465 | } |
1da177e4 LT |
1466 | |
1467 | spin_unlock_irqrestore(&pi->port.lock, flags); | |
1da177e4 LT |
1468 | } |
1469 | ||
2e89db75 | 1470 | static const char *mpsc_type(struct uart_port *port) |
1da177e4 LT |
1471 | { |
1472 | pr_debug("mpsc_type[%d]: port type: %s\n", port->line,MPSC_DRIVER_NAME); | |
1473 | return MPSC_DRIVER_NAME; | |
1474 | } | |
1475 | ||
2e89db75 | 1476 | static int mpsc_request_port(struct uart_port *port) |
1da177e4 LT |
1477 | { |
1478 | /* Should make chip/platform specific call */ | |
1479 | return 0; | |
1480 | } | |
1481 | ||
2e89db75 | 1482 | static void mpsc_release_port(struct uart_port *port) |
1da177e4 LT |
1483 | { |
1484 | struct mpsc_port_info *pi = (struct mpsc_port_info *)port; | |
1485 | ||
1486 | if (pi->ready) { | |
1487 | mpsc_uninit_rings(pi); | |
1488 | mpsc_free_ring_mem(pi); | |
1489 | pi->ready = 0; | |
1490 | } | |
1da177e4 LT |
1491 | } |
1492 | ||
2e89db75 | 1493 | static void mpsc_config_port(struct uart_port *port, int flags) |
1da177e4 | 1494 | { |
1da177e4 LT |
1495 | } |
1496 | ||
2e89db75 | 1497 | static int mpsc_verify_port(struct uart_port *port, struct serial_struct *ser) |
1da177e4 LT |
1498 | { |
1499 | struct mpsc_port_info *pi = (struct mpsc_port_info *)port; | |
1500 | int rc = 0; | |
1501 | ||
1502 | pr_debug("mpsc_verify_port[%d]: Verifying port data\n", pi->port.line); | |
1503 | ||
1504 | if (ser->type != PORT_UNKNOWN && ser->type != PORT_MPSC) | |
1505 | rc = -EINVAL; | |
1506 | else if (pi->port.irq != ser->irq) | |
1507 | rc = -EINVAL; | |
1508 | else if (ser->io_type != SERIAL_IO_MEM) | |
1509 | rc = -EINVAL; | |
1510 | else if (pi->port.uartclk / 16 != ser->baud_base) /* Not sure */ | |
1511 | rc = -EINVAL; | |
1512 | else if ((void *)pi->port.mapbase != ser->iomem_base) | |
1513 | rc = -EINVAL; | |
1514 | else if (pi->port.iobase != ser->port) | |
1515 | rc = -EINVAL; | |
1516 | else if (ser->hub6 != 0) | |
1517 | rc = -EINVAL; | |
1518 | ||
1519 | return rc; | |
1520 | } | |
1521 | ||
1522 | static struct uart_ops mpsc_pops = { | |
2e89db75 MG |
1523 | .tx_empty = mpsc_tx_empty, |
1524 | .set_mctrl = mpsc_set_mctrl, | |
1525 | .get_mctrl = mpsc_get_mctrl, | |
1526 | .stop_tx = mpsc_stop_tx, | |
1527 | .start_tx = mpsc_start_tx, | |
1528 | .stop_rx = mpsc_stop_rx, | |
1529 | .enable_ms = mpsc_enable_ms, | |
1530 | .break_ctl = mpsc_break_ctl, | |
1531 | .startup = mpsc_startup, | |
1532 | .shutdown = mpsc_shutdown, | |
1533 | .set_termios = mpsc_set_termios, | |
1534 | .type = mpsc_type, | |
1535 | .release_port = mpsc_release_port, | |
1536 | .request_port = mpsc_request_port, | |
1537 | .config_port = mpsc_config_port, | |
1538 | .verify_port = mpsc_verify_port, | |
1da177e4 LT |
1539 | }; |
1540 | ||
1541 | /* | |
1542 | ****************************************************************************** | |
1543 | * | |
1544 | * Console Interface Routines | |
1545 | * | |
1546 | ****************************************************************************** | |
1547 | */ | |
1548 | ||
1549 | #ifdef CONFIG_SERIAL_MPSC_CONSOLE | |
2e89db75 | 1550 | static void mpsc_console_write(struct console *co, const char *s, uint count) |
1da177e4 LT |
1551 | { |
1552 | struct mpsc_port_info *pi = &mpsc_ports[co->index]; | |
1553 | u8 *bp, *dp, add_cr = 0; | |
1554 | int i; | |
1733310b DJ |
1555 | unsigned long iflags; |
1556 | ||
1557 | spin_lock_irqsave(&pi->tx_lock, iflags); | |
1558 | ||
1559 | while (pi->txr_head != pi->txr_tail) { | |
1560 | while (mpsc_sdma_tx_active(pi)) | |
1561 | udelay(100); | |
1562 | mpsc_sdma_intr_ack(pi); | |
1563 | mpsc_tx_intr(pi); | |
1564 | } | |
1da177e4 LT |
1565 | |
1566 | while (mpsc_sdma_tx_active(pi)) | |
1567 | udelay(100); | |
1568 | ||
1569 | while (count > 0) { | |
1570 | bp = dp = pi->txb + (pi->txr_head * MPSC_TXBE_SIZE); | |
1571 | ||
1572 | for (i = 0; i < MPSC_TXBE_SIZE; i++) { | |
1573 | if (count == 0) | |
1574 | break; | |
1575 | ||
1576 | if (add_cr) { | |
1577 | *(dp++) = '\r'; | |
1578 | add_cr = 0; | |
2e89db75 | 1579 | } else { |
1da177e4 LT |
1580 | *(dp++) = *s; |
1581 | ||
1582 | if (*(s++) == '\n') { /* add '\r' after '\n' */ | |
1583 | add_cr = 1; | |
1584 | count++; | |
1585 | } | |
1586 | } | |
1587 | ||
1588 | count--; | |
1589 | } | |
1590 | ||
2e89db75 MG |
1591 | dma_cache_sync(pi->port.dev, (void *)bp, MPSC_TXBE_SIZE, |
1592 | DMA_BIDIRECTIONAL); | |
1da177e4 LT |
1593 | #if defined(CONFIG_PPC32) && !defined(CONFIG_NOT_COHERENT_CACHE) |
1594 | if (pi->cache_mgmt) /* GT642[46]0 Res #COMM-2 */ | |
1595 | flush_dcache_range((ulong)bp, | |
2e89db75 | 1596 | (ulong)bp + MPSC_TXBE_SIZE); |
1da177e4 LT |
1597 | #endif |
1598 | mpsc_setup_tx_desc(pi, i, 0); | |
1599 | pi->txr_head = (pi->txr_head + 1) & (MPSC_TXR_ENTRIES - 1); | |
1600 | mpsc_sdma_start_tx(pi); | |
1601 | ||
1602 | while (mpsc_sdma_tx_active(pi)) | |
1603 | udelay(100); | |
1604 | ||
1605 | pi->txr_tail = (pi->txr_tail + 1) & (MPSC_TXR_ENTRIES - 1); | |
1606 | } | |
1607 | ||
1733310b | 1608 | spin_unlock_irqrestore(&pi->tx_lock, iflags); |
1da177e4 LT |
1609 | } |
1610 | ||
2e89db75 | 1611 | static int __init mpsc_console_setup(struct console *co, char *options) |
1da177e4 LT |
1612 | { |
1613 | struct mpsc_port_info *pi; | |
1614 | int baud, bits, parity, flow; | |
1615 | ||
1616 | pr_debug("mpsc_console_setup[%d]: options: %s\n", co->index, options); | |
1617 | ||
1618 | if (co->index >= MPSC_NUM_CTLRS) | |
1619 | co->index = 0; | |
1620 | ||
1621 | pi = &mpsc_ports[co->index]; | |
1622 | ||
1623 | baud = pi->default_baud; | |
1624 | bits = pi->default_bits; | |
1625 | parity = pi->default_parity; | |
1626 | flow = pi->default_flow; | |
1627 | ||
1628 | if (!pi->port.ops) | |
1629 | return -ENODEV; | |
1630 | ||
1631 | spin_lock_init(&pi->port.lock); /* Temporary fix--copied from 8250.c */ | |
1632 | ||
1633 | if (options) | |
1634 | uart_parse_options(options, &baud, &parity, &bits, &flow); | |
1635 | ||
1636 | return uart_set_options(&pi->port, co, baud, parity, bits, flow); | |
1637 | } | |
1638 | ||
1da177e4 | 1639 | static struct console mpsc_console = { |
2e89db75 MG |
1640 | .name = MPSC_DEV_NAME, |
1641 | .write = mpsc_console_write, | |
1642 | .device = uart_console_device, | |
1643 | .setup = mpsc_console_setup, | |
1644 | .flags = CON_PRINTBUFFER, | |
1645 | .index = -1, | |
1646 | .data = &mpsc_reg, | |
1da177e4 LT |
1647 | }; |
1648 | ||
2e89db75 | 1649 | static int __init mpsc_late_console_init(void) |
1da177e4 LT |
1650 | { |
1651 | pr_debug("mpsc_late_console_init: Enter\n"); | |
1652 | ||
1653 | if (!(mpsc_console.flags & CON_ENABLED)) | |
1654 | register_console(&mpsc_console); | |
1655 | return 0; | |
1656 | } | |
1657 | ||
1658 | late_initcall(mpsc_late_console_init); | |
1659 | ||
1660 | #define MPSC_CONSOLE &mpsc_console | |
1661 | #else | |
1662 | #define MPSC_CONSOLE NULL | |
1663 | #endif | |
1664 | /* | |
1665 | ****************************************************************************** | |
1666 | * | |
1667 | * Dummy Platform Driver to extract & map shared register regions | |
1668 | * | |
1669 | ****************************************************************************** | |
1670 | */ | |
2e89db75 | 1671 | static void mpsc_resource_err(char *s) |
1da177e4 LT |
1672 | { |
1673 | printk(KERN_WARNING "MPSC: Platform device resource error in %s\n", s); | |
1da177e4 LT |
1674 | } |
1675 | ||
2e89db75 | 1676 | static int mpsc_shared_map_regs(struct platform_device *pd) |
1da177e4 LT |
1677 | { |
1678 | struct resource *r; | |
1679 | ||
1680 | if ((r = platform_get_resource(pd, IORESOURCE_MEM, | |
2e89db75 MG |
1681 | MPSC_ROUTING_BASE_ORDER)) |
1682 | && request_mem_region(r->start, | |
1683 | MPSC_ROUTING_REG_BLOCK_SIZE, | |
1684 | "mpsc_routing_regs")) { | |
1da177e4 | 1685 | mpsc_shared_regs.mpsc_routing_base = ioremap(r->start, |
2e89db75 | 1686 | MPSC_ROUTING_REG_BLOCK_SIZE); |
1da177e4 | 1687 | mpsc_shared_regs.mpsc_routing_base_p = r->start; |
2e89db75 | 1688 | } else { |
1da177e4 LT |
1689 | mpsc_resource_err("MPSC routing base"); |
1690 | return -ENOMEM; | |
1691 | } | |
1692 | ||
1693 | if ((r = platform_get_resource(pd, IORESOURCE_MEM, | |
2e89db75 MG |
1694 | MPSC_SDMA_INTR_BASE_ORDER)) |
1695 | && request_mem_region(r->start, | |
1696 | MPSC_SDMA_INTR_REG_BLOCK_SIZE, | |
1697 | "sdma_intr_regs")) { | |
1da177e4 LT |
1698 | mpsc_shared_regs.sdma_intr_base = ioremap(r->start, |
1699 | MPSC_SDMA_INTR_REG_BLOCK_SIZE); | |
1700 | mpsc_shared_regs.sdma_intr_base_p = r->start; | |
2e89db75 | 1701 | } else { |
1da177e4 LT |
1702 | iounmap(mpsc_shared_regs.mpsc_routing_base); |
1703 | release_mem_region(mpsc_shared_regs.mpsc_routing_base_p, | |
2e89db75 | 1704 | MPSC_ROUTING_REG_BLOCK_SIZE); |
1da177e4 LT |
1705 | mpsc_resource_err("SDMA intr base"); |
1706 | return -ENOMEM; | |
1707 | } | |
1708 | ||
1709 | return 0; | |
1710 | } | |
1711 | ||
2e89db75 | 1712 | static void mpsc_shared_unmap_regs(void) |
1da177e4 LT |
1713 | { |
1714 | if (!mpsc_shared_regs.mpsc_routing_base) { | |
1715 | iounmap(mpsc_shared_regs.mpsc_routing_base); | |
1716 | release_mem_region(mpsc_shared_regs.mpsc_routing_base_p, | |
2e89db75 | 1717 | MPSC_ROUTING_REG_BLOCK_SIZE); |
1da177e4 LT |
1718 | } |
1719 | if (!mpsc_shared_regs.sdma_intr_base) { | |
1720 | iounmap(mpsc_shared_regs.sdma_intr_base); | |
1721 | release_mem_region(mpsc_shared_regs.sdma_intr_base_p, | |
2e89db75 | 1722 | MPSC_SDMA_INTR_REG_BLOCK_SIZE); |
1da177e4 LT |
1723 | } |
1724 | ||
2c6e7599 AV |
1725 | mpsc_shared_regs.mpsc_routing_base = NULL; |
1726 | mpsc_shared_regs.sdma_intr_base = NULL; | |
1da177e4 LT |
1727 | |
1728 | mpsc_shared_regs.mpsc_routing_base_p = 0; | |
1729 | mpsc_shared_regs.sdma_intr_base_p = 0; | |
1da177e4 LT |
1730 | } |
1731 | ||
2e89db75 | 1732 | static int mpsc_shared_drv_probe(struct platform_device *dev) |
1da177e4 | 1733 | { |
1da177e4 LT |
1734 | struct mpsc_shared_pdata *pdata; |
1735 | int rc = -ENODEV; | |
1736 | ||
3ae5eaec | 1737 | if (dev->id == 0) { |
2e89db75 MG |
1738 | if (!(rc = mpsc_shared_map_regs(dev))) { |
1739 | pdata = (struct mpsc_shared_pdata *) | |
1740 | dev->dev.platform_data; | |
1da177e4 LT |
1741 | |
1742 | mpsc_shared_regs.MPSC_MRR_m = pdata->mrr_val; | |
1743 | mpsc_shared_regs.MPSC_RCRR_m= pdata->rcrr_val; | |
1744 | mpsc_shared_regs.MPSC_TCRR_m= pdata->tcrr_val; | |
1745 | mpsc_shared_regs.SDMA_INTR_CAUSE_m = | |
1746 | pdata->intr_cause_val; | |
1747 | mpsc_shared_regs.SDMA_INTR_MASK_m = | |
1748 | pdata->intr_mask_val; | |
1749 | ||
1750 | rc = 0; | |
1751 | } | |
1752 | } | |
1753 | ||
1754 | return rc; | |
1755 | } | |
1756 | ||
2e89db75 | 1757 | static int mpsc_shared_drv_remove(struct platform_device *dev) |
1da177e4 | 1758 | { |
1da177e4 LT |
1759 | int rc = -ENODEV; |
1760 | ||
3ae5eaec | 1761 | if (dev->id == 0) { |
1da177e4 LT |
1762 | mpsc_shared_unmap_regs(); |
1763 | mpsc_shared_regs.MPSC_MRR_m = 0; | |
1764 | mpsc_shared_regs.MPSC_RCRR_m = 0; | |
1765 | mpsc_shared_regs.MPSC_TCRR_m = 0; | |
1766 | mpsc_shared_regs.SDMA_INTR_CAUSE_m = 0; | |
1767 | mpsc_shared_regs.SDMA_INTR_MASK_m = 0; | |
1768 | rc = 0; | |
1769 | } | |
1770 | ||
1771 | return rc; | |
1772 | } | |
1773 | ||
3ae5eaec | 1774 | static struct platform_driver mpsc_shared_driver = { |
1da177e4 LT |
1775 | .probe = mpsc_shared_drv_probe, |
1776 | .remove = mpsc_shared_drv_remove, | |
3ae5eaec | 1777 | .driver = { |
2e89db75 | 1778 | .name = MPSC_SHARED_NAME, |
3ae5eaec | 1779 | }, |
1da177e4 LT |
1780 | }; |
1781 | ||
1782 | /* | |
1783 | ****************************************************************************** | |
1784 | * | |
1785 | * Driver Interface Routines | |
1786 | * | |
1787 | ****************************************************************************** | |
1788 | */ | |
1789 | static struct uart_driver mpsc_reg = { | |
2e89db75 MG |
1790 | .owner = THIS_MODULE, |
1791 | .driver_name = MPSC_DRIVER_NAME, | |
1792 | .dev_name = MPSC_DEV_NAME, | |
1793 | .major = MPSC_MAJOR, | |
1794 | .minor = MPSC_MINOR_START, | |
1795 | .nr = MPSC_NUM_CTLRS, | |
1796 | .cons = MPSC_CONSOLE, | |
1da177e4 LT |
1797 | }; |
1798 | ||
2e89db75 MG |
1799 | static int mpsc_drv_map_regs(struct mpsc_port_info *pi, |
1800 | struct platform_device *pd) | |
1da177e4 LT |
1801 | { |
1802 | struct resource *r; | |
1803 | ||
2e89db75 MG |
1804 | if ((r = platform_get_resource(pd, IORESOURCE_MEM, MPSC_BASE_ORDER)) |
1805 | && request_mem_region(r->start, MPSC_REG_BLOCK_SIZE, | |
1806 | "mpsc_regs")) { | |
1da177e4 LT |
1807 | pi->mpsc_base = ioremap(r->start, MPSC_REG_BLOCK_SIZE); |
1808 | pi->mpsc_base_p = r->start; | |
2e89db75 | 1809 | } else { |
1da177e4 | 1810 | mpsc_resource_err("MPSC base"); |
2e89db75 | 1811 | goto err; |
1da177e4 LT |
1812 | } |
1813 | ||
1814 | if ((r = platform_get_resource(pd, IORESOURCE_MEM, | |
2e89db75 MG |
1815 | MPSC_SDMA_BASE_ORDER)) |
1816 | && request_mem_region(r->start, | |
1817 | MPSC_SDMA_REG_BLOCK_SIZE, "sdma_regs")) { | |
1da177e4 LT |
1818 | pi->sdma_base = ioremap(r->start,MPSC_SDMA_REG_BLOCK_SIZE); |
1819 | pi->sdma_base_p = r->start; | |
2e89db75 | 1820 | } else { |
1da177e4 | 1821 | mpsc_resource_err("SDMA base"); |
a141a043 AL |
1822 | if (pi->mpsc_base) { |
1823 | iounmap(pi->mpsc_base); | |
1824 | pi->mpsc_base = NULL; | |
1825 | } | |
2e89db75 | 1826 | goto err; |
1da177e4 LT |
1827 | } |
1828 | ||
1829 | if ((r = platform_get_resource(pd,IORESOURCE_MEM,MPSC_BRG_BASE_ORDER)) | |
2e89db75 MG |
1830 | && request_mem_region(r->start, |
1831 | MPSC_BRG_REG_BLOCK_SIZE, "brg_regs")) { | |
1da177e4 LT |
1832 | pi->brg_base = ioremap(r->start, MPSC_BRG_REG_BLOCK_SIZE); |
1833 | pi->brg_base_p = r->start; | |
2e89db75 | 1834 | } else { |
1da177e4 | 1835 | mpsc_resource_err("BRG base"); |
a141a043 AL |
1836 | if (pi->mpsc_base) { |
1837 | iounmap(pi->mpsc_base); | |
1838 | pi->mpsc_base = NULL; | |
1839 | } | |
1840 | if (pi->sdma_base) { | |
1841 | iounmap(pi->sdma_base); | |
1842 | pi->sdma_base = NULL; | |
1843 | } | |
2e89db75 | 1844 | goto err; |
1da177e4 | 1845 | } |
1da177e4 | 1846 | return 0; |
2e89db75 MG |
1847 | |
1848 | err: | |
1849 | return -ENOMEM; | |
1da177e4 LT |
1850 | } |
1851 | ||
2e89db75 | 1852 | static void mpsc_drv_unmap_regs(struct mpsc_port_info *pi) |
1da177e4 LT |
1853 | { |
1854 | if (!pi->mpsc_base) { | |
1855 | iounmap(pi->mpsc_base); | |
1856 | release_mem_region(pi->mpsc_base_p, MPSC_REG_BLOCK_SIZE); | |
1857 | } | |
1858 | if (!pi->sdma_base) { | |
1859 | iounmap(pi->sdma_base); | |
1860 | release_mem_region(pi->sdma_base_p, MPSC_SDMA_REG_BLOCK_SIZE); | |
1861 | } | |
1862 | if (!pi->brg_base) { | |
1863 | iounmap(pi->brg_base); | |
1864 | release_mem_region(pi->brg_base_p, MPSC_BRG_REG_BLOCK_SIZE); | |
1865 | } | |
1866 | ||
2c6e7599 AV |
1867 | pi->mpsc_base = NULL; |
1868 | pi->sdma_base = NULL; | |
1869 | pi->brg_base = NULL; | |
1da177e4 LT |
1870 | |
1871 | pi->mpsc_base_p = 0; | |
1872 | pi->sdma_base_p = 0; | |
1873 | pi->brg_base_p = 0; | |
1da177e4 LT |
1874 | } |
1875 | ||
2e89db75 MG |
1876 | static void mpsc_drv_get_platform_data(struct mpsc_port_info *pi, |
1877 | struct platform_device *pd, int num) | |
1da177e4 LT |
1878 | { |
1879 | struct mpsc_pdata *pdata; | |
1880 | ||
1881 | pdata = (struct mpsc_pdata *)pd->dev.platform_data; | |
1882 | ||
1883 | pi->port.uartclk = pdata->brg_clk_freq; | |
1884 | pi->port.iotype = UPIO_MEM; | |
1885 | pi->port.line = num; | |
1886 | pi->port.type = PORT_MPSC; | |
1887 | pi->port.fifosize = MPSC_TXBE_SIZE; | |
1888 | pi->port.membase = pi->mpsc_base; | |
1889 | pi->port.mapbase = (ulong)pi->mpsc_base; | |
1890 | pi->port.ops = &mpsc_pops; | |
1891 | ||
1892 | pi->mirror_regs = pdata->mirror_regs; | |
1893 | pi->cache_mgmt = pdata->cache_mgmt; | |
1894 | pi->brg_can_tune = pdata->brg_can_tune; | |
1895 | pi->brg_clk_src = pdata->brg_clk_src; | |
1896 | pi->mpsc_max_idle = pdata->max_idle; | |
1897 | pi->default_baud = pdata->default_baud; | |
1898 | pi->default_bits = pdata->default_bits; | |
1899 | pi->default_parity = pdata->default_parity; | |
1900 | pi->default_flow = pdata->default_flow; | |
1901 | ||
1902 | /* Initial values of mirrored regs */ | |
1903 | pi->MPSC_CHR_1_m = pdata->chr_1_val; | |
1904 | pi->MPSC_CHR_2_m = pdata->chr_2_val; | |
1905 | pi->MPSC_CHR_10_m = pdata->chr_10_val; | |
1906 | pi->MPSC_MPCR_m = pdata->mpcr_val; | |
1907 | pi->BRG_BCR_m = pdata->bcr_val; | |
1908 | ||
1909 | pi->shared_regs = &mpsc_shared_regs; | |
1910 | ||
1911 | pi->port.irq = platform_get_irq(pd, 0); | |
1da177e4 LT |
1912 | } |
1913 | ||
2e89db75 | 1914 | static int mpsc_drv_probe(struct platform_device *dev) |
1da177e4 | 1915 | { |
1da177e4 LT |
1916 | struct mpsc_port_info *pi; |
1917 | int rc = -ENODEV; | |
1918 | ||
3ae5eaec | 1919 | pr_debug("mpsc_drv_probe: Adding MPSC %d\n", dev->id); |
1da177e4 | 1920 | |
3ae5eaec RK |
1921 | if (dev->id < MPSC_NUM_CTLRS) { |
1922 | pi = &mpsc_ports[dev->id]; | |
1da177e4 | 1923 | |
3ae5eaec RK |
1924 | if (!(rc = mpsc_drv_map_regs(pi, dev))) { |
1925 | mpsc_drv_get_platform_data(pi, dev, dev->id); | |
1da177e4 | 1926 | |
1733310b DJ |
1927 | if (!(rc = mpsc_make_ready(pi))) { |
1928 | spin_lock_init(&pi->tx_lock); | |
1da177e4 | 1929 | if (!(rc = uart_add_one_port(&mpsc_reg, |
2e89db75 | 1930 | &pi->port))) { |
1da177e4 | 1931 | rc = 0; |
2e89db75 MG |
1932 | } else { |
1933 | mpsc_release_port((struct uart_port *) | |
1934 | pi); | |
1da177e4 LT |
1935 | mpsc_drv_unmap_regs(pi); |
1936 | } | |
2e89db75 | 1937 | } else { |
1da177e4 | 1938 | mpsc_drv_unmap_regs(pi); |
2e89db75 | 1939 | } |
1da177e4 LT |
1940 | } |
1941 | } | |
1942 | ||
1943 | return rc; | |
1944 | } | |
1945 | ||
2e89db75 | 1946 | static int mpsc_drv_remove(struct platform_device *dev) |
1da177e4 | 1947 | { |
3ae5eaec | 1948 | pr_debug("mpsc_drv_exit: Removing MPSC %d\n", dev->id); |
1da177e4 | 1949 | |
3ae5eaec RK |
1950 | if (dev->id < MPSC_NUM_CTLRS) { |
1951 | uart_remove_one_port(&mpsc_reg, &mpsc_ports[dev->id].port); | |
2e89db75 MG |
1952 | mpsc_release_port((struct uart_port *) |
1953 | &mpsc_ports[dev->id].port); | |
3ae5eaec | 1954 | mpsc_drv_unmap_regs(&mpsc_ports[dev->id]); |
1da177e4 | 1955 | return 0; |
2e89db75 | 1956 | } else { |
1da177e4 | 1957 | return -ENODEV; |
2e89db75 | 1958 | } |
1da177e4 LT |
1959 | } |
1960 | ||
3ae5eaec | 1961 | static struct platform_driver mpsc_driver = { |
1da177e4 LT |
1962 | .probe = mpsc_drv_probe, |
1963 | .remove = mpsc_drv_remove, | |
3ae5eaec | 1964 | .driver = { |
2e89db75 | 1965 | .name = MPSC_CTLR_NAME, |
3ae5eaec | 1966 | }, |
1da177e4 LT |
1967 | }; |
1968 | ||
2e89db75 | 1969 | static int __init mpsc_drv_init(void) |
1da177e4 LT |
1970 | { |
1971 | int rc; | |
1972 | ||
1973 | printk(KERN_INFO "Serial: MPSC driver $Revision: 1.00 $\n"); | |
1974 | ||
1975 | memset(mpsc_ports, 0, sizeof(mpsc_ports)); | |
1976 | memset(&mpsc_shared_regs, 0, sizeof(mpsc_shared_regs)); | |
1977 | ||
1978 | if (!(rc = uart_register_driver(&mpsc_reg))) { | |
3ae5eaec RK |
1979 | if (!(rc = platform_driver_register(&mpsc_shared_driver))) { |
1980 | if ((rc = platform_driver_register(&mpsc_driver))) { | |
1981 | platform_driver_unregister(&mpsc_shared_driver); | |
1da177e4 LT |
1982 | uart_unregister_driver(&mpsc_reg); |
1983 | } | |
2e89db75 | 1984 | } else { |
1da177e4 | 1985 | uart_unregister_driver(&mpsc_reg); |
2e89db75 | 1986 | } |
1da177e4 LT |
1987 | } |
1988 | ||
1989 | return rc; | |
1da177e4 LT |
1990 | } |
1991 | ||
2e89db75 | 1992 | static void __exit mpsc_drv_exit(void) |
1da177e4 | 1993 | { |
3ae5eaec RK |
1994 | platform_driver_unregister(&mpsc_driver); |
1995 | platform_driver_unregister(&mpsc_shared_driver); | |
1da177e4 LT |
1996 | uart_unregister_driver(&mpsc_reg); |
1997 | memset(mpsc_ports, 0, sizeof(mpsc_ports)); | |
1998 | memset(&mpsc_shared_regs, 0, sizeof(mpsc_shared_regs)); | |
1da177e4 LT |
1999 | } |
2000 | ||
2001 | module_init(mpsc_drv_init); | |
2002 | module_exit(mpsc_drv_exit); | |
2003 | ||
2004 | MODULE_AUTHOR("Mark A. Greer <mgreer@mvista.com>"); | |
2005 | MODULE_DESCRIPTION("Generic Marvell MPSC serial/UART driver $Revision: 1.00 $"); | |
2006 | MODULE_VERSION(MPSC_VERSION); | |
2007 | MODULE_LICENSE("GPL"); | |
2008 | MODULE_ALIAS_CHARDEV_MAJOR(MPSC_MAJOR); |