Commit | Line | Data |
---|---|---|
1da177e4 | 1 | /* |
1da177e4 LT |
2 | * Driver for 8250/16550-type serial ports |
3 | * | |
4 | * Based on drivers/char/serial.c, by Linus Torvalds, Theodore Ts'o. | |
5 | * | |
6 | * Copyright (C) 2001 Russell King. | |
7 | * | |
8 | * This program is free software; you can redistribute it and/or modify | |
9 | * it under the terms of the GNU General Public License as published by | |
10 | * the Free Software Foundation; either version 2 of the License, or | |
11 | * (at your option) any later version. | |
1da177e4 LT |
12 | */ |
13 | ||
bc49a661 | 14 | #include <linux/serial_8250.h> |
aef9a7bd | 15 | #include <linux/serial_reg.h> |
9ee4b83e HK |
16 | #include <linux/dmaengine.h> |
17 | ||
18 | struct uart_8250_dma { | |
f1a297bb SAS |
19 | int (*tx_dma)(struct uart_8250_port *p); |
20 | int (*rx_dma)(struct uart_8250_port *p, unsigned int iir); | |
21 | ||
9a1870ce | 22 | /* Filter function */ |
9ee4b83e | 23 | dma_filter_fn fn; |
9a1870ce | 24 | /* Parameter to the filter function */ |
9ee4b83e HK |
25 | void *rx_param; |
26 | void *tx_param; | |
27 | ||
9ee4b83e HK |
28 | struct dma_slave_config rxconf; |
29 | struct dma_slave_config txconf; | |
30 | ||
31 | struct dma_chan *rxchan; | |
32 | struct dma_chan *txchan; | |
33 | ||
34 | dma_addr_t rx_addr; | |
35 | dma_addr_t tx_addr; | |
36 | ||
37 | dma_cookie_t rx_cookie; | |
38 | dma_cookie_t tx_cookie; | |
39 | ||
40 | void *rx_buf; | |
41 | ||
42 | size_t rx_size; | |
43 | size_t tx_size; | |
44 | ||
45 | unsigned char tx_running:1; | |
b2202821 | 46 | unsigned char tx_err: 1; |
0fcb7901 | 47 | unsigned char rx_running:1; |
9ee4b83e | 48 | }; |
1da177e4 LT |
49 | |
50 | struct old_serial_port { | |
51 | unsigned int uart; | |
52 | unsigned int baud_base; | |
53 | unsigned int port; | |
54 | unsigned int irq; | |
079119a2 | 55 | upf_t flags; |
1da177e4 LT |
56 | unsigned char hub6; |
57 | unsigned char io_type; | |
7f1dc2f3 | 58 | unsigned char __iomem *iomem_base; |
1da177e4 | 59 | unsigned short iomem_reg_shift; |
1c2f0493 | 60 | unsigned long irqflags; |
1da177e4 LT |
61 | }; |
62 | ||
1da177e4 LT |
63 | struct serial8250_config { |
64 | const char *name; | |
65 | unsigned short fifo_size; | |
66 | unsigned short tx_loadsz; | |
67 | unsigned char fcr; | |
aef9a7bd | 68 | unsigned char rxtrig_bytes[UART_FCR_R_TRIG_MAX_STATE]; |
1da177e4 LT |
69 | unsigned int flags; |
70 | }; | |
71 | ||
72 | #define UART_CAP_FIFO (1 << 8) /* UART has FIFO */ | |
73 | #define UART_CAP_EFR (1 << 9) /* UART has EFR */ | |
74 | #define UART_CAP_SLEEP (1 << 10) /* UART has IER sleep */ | |
75 | #define UART_CAP_AFE (1 << 11) /* MCR-based hw flow control */ | |
76 | #define UART_CAP_UUE (1 << 12) /* UART needs IER bit 6 set (Xscale) */ | |
4539c24f | 77 | #define UART_CAP_RTOIE (1 << 13) /* UART needs IER bit 4 set (Xscale, Tegra) */ |
ebebd49a | 78 | #define UART_CAP_HFIFO (1 << 14) /* UART has a "hidden" FIFO */ |
d74d5d1b | 79 | #define UART_CAP_RPM (1 << 15) /* Runtime PM is active while idle */ |
1da177e4 | 80 | |
4ba5e35d | 81 | #define UART_BUG_QUOT (1 << 0) /* UART has buggy quot LSB */ |
55d3b282 | 82 | #define UART_BUG_TXEN (1 << 1) /* UART has buggy TX IIR status */ |
21c614a7 | 83 | #define UART_BUG_NOMSR (1 << 2) /* UART has buggy MSR status bits (Au1x00) */ |
363f66fe | 84 | #define UART_BUG_THRE (1 << 3) /* UART has buggy THRE reassertion */ |
eb26dfe8 | 85 | #define UART_BUG_PARITY (1 << 4) /* UART mishandles parity if FIFO enabled */ |
4ba5e35d | 86 | |
1da177e4 LT |
87 | #define HIGH_BITS_OFFSET ((sizeof(long)-sizeof(int))*8) |
88 | ||
89 | #ifdef CONFIG_SERIAL_8250_SHARE_IRQ | |
90 | #define SERIAL8250_SHARE_IRQS 1 | |
91 | #else | |
92 | #define SERIAL8250_SHARE_IRQS 0 | |
93 | #endif | |
94 | ||
3f0ab327 PG |
95 | static inline int serial_in(struct uart_8250_port *up, int offset) |
96 | { | |
97 | return up->port.serial_in(&up->port, offset); | |
98 | } | |
99 | ||
100 | static inline void serial_out(struct uart_8250_port *up, int offset, int value) | |
101 | { | |
102 | up->port.serial_out(&up->port, offset, value); | |
103 | } | |
104 | ||
0ad372b9 SM |
105 | void serial8250_clear_and_reinit_fifos(struct uart_8250_port *p); |
106 | ||
cc419fa0 MD |
107 | static inline int serial_dl_read(struct uart_8250_port *up) |
108 | { | |
109 | return up->dl_read(up); | |
110 | } | |
111 | ||
112 | static inline void serial_dl_write(struct uart_8250_port *up, int value) | |
113 | { | |
114 | up->dl_write(up, value); | |
115 | } | |
116 | ||
ae14a795 | 117 | struct uart_8250_port *serial8250_get_port(int line); |
77285243 SAS |
118 | void serial8250_rpm_get(struct uart_8250_port *p); |
119 | void serial8250_rpm_put(struct uart_8250_port *p); | |
ae14a795 | 120 | |
1da177e4 LT |
121 | #if defined(__alpha__) && !defined(CONFIG_PCI) |
122 | /* | |
123 | * Digital did something really horribly wrong with the OUT1 and OUT2 | |
124 | * lines on at least some ALPHA's. The failure mode is that if either | |
125 | * is cleared, the machine locks up with endless interrupts. | |
126 | */ | |
127 | #define ALPHA_KLUDGE_MCR (UART_MCR_OUT2 | UART_MCR_OUT1) | |
1da177e4 LT |
128 | #else |
129 | #define ALPHA_KLUDGE_MCR 0 | |
130 | #endif | |
835d844d SY |
131 | |
132 | #ifdef CONFIG_SERIAL_8250_PNP | |
133 | int serial8250_pnp_init(void); | |
134 | void serial8250_pnp_exit(void); | |
135 | #else | |
136 | static inline int serial8250_pnp_init(void) { return 0; } | |
137 | static inline void serial8250_pnp_exit(void) { } | |
138 | #endif | |
139 | ||
54ec52b6 TL |
140 | #ifdef CONFIG_ARCH_OMAP1 |
141 | static inline int is_omap1_8250(struct uart_8250_port *pt) | |
142 | { | |
143 | int res; | |
144 | ||
145 | switch (pt->port.mapbase) { | |
146 | case OMAP1_UART1_BASE: | |
147 | case OMAP1_UART2_BASE: | |
148 | case OMAP1_UART3_BASE: | |
149 | res = 1; | |
150 | break; | |
151 | default: | |
152 | res = 0; | |
153 | break; | |
154 | } | |
155 | ||
156 | return res; | |
157 | } | |
158 | ||
159 | static inline int is_omap1510_8250(struct uart_8250_port *pt) | |
160 | { | |
161 | if (!cpu_is_omap1510()) | |
162 | return 0; | |
163 | ||
164 | return is_omap1_8250(pt); | |
165 | } | |
166 | #else | |
167 | static inline int is_omap1_8250(struct uart_8250_port *pt) | |
168 | { | |
169 | return 0; | |
170 | } | |
171 | static inline int is_omap1510_8250(struct uart_8250_port *pt) | |
172 | { | |
173 | return 0; | |
174 | } | |
175 | #endif | |
9ee4b83e HK |
176 | |
177 | #ifdef CONFIG_SERIAL_8250_DMA | |
178 | extern int serial8250_tx_dma(struct uart_8250_port *); | |
179 | extern int serial8250_rx_dma(struct uart_8250_port *, unsigned int iir); | |
180 | extern int serial8250_request_dma(struct uart_8250_port *); | |
181 | extern void serial8250_release_dma(struct uart_8250_port *); | |
182 | #else | |
183 | static inline int serial8250_tx_dma(struct uart_8250_port *p) | |
184 | { | |
185 | return -1; | |
186 | } | |
187 | static inline int serial8250_rx_dma(struct uart_8250_port *p, unsigned int iir) | |
188 | { | |
189 | return -1; | |
190 | } | |
191 | static inline int serial8250_request_dma(struct uart_8250_port *p) | |
192 | { | |
193 | return -1; | |
194 | } | |
195 | static inline void serial8250_release_dma(struct uart_8250_port *p) { } | |
196 | #endif | |
d81e50f6 PH |
197 | |
198 | static inline int ns16550a_goto_highspeed(struct uart_8250_port *up) | |
199 | { | |
200 | unsigned char status; | |
201 | ||
202 | status = serial_in(up, 0x04); /* EXCR2 */ | |
203 | #define PRESL(x) ((x) & 0x30) | |
204 | if (PRESL(status) == 0x10) { | |
205 | /* already in high speed mode */ | |
206 | return 0; | |
207 | } else { | |
208 | status &= ~0xB0; /* Disable LOCK, mask out PRESL[01] */ | |
209 | status |= 0x10; /* 1.625 divisor for baud_base --> 921600 */ | |
210 | serial_out(up, 0x04, status); | |
211 | } | |
212 | return 1; | |
213 | } | |
b6830f6d PH |
214 | |
215 | static inline int serial_index(struct uart_port *port) | |
216 | { | |
217 | return port->minor - 64; | |
218 | } | |
219 | ||
220 | #if 0 | |
221 | #define DEBUG_INTR(fmt...) printk(fmt) | |
222 | #else | |
223 | #define DEBUG_INTR(fmt...) do { } while (0) | |
224 | #endif |