1 #include <linux/wait.h>
2
3 #define UART_CONFIG_TYPE (1 << 0)
4 #define UART_CONFIG_IRQ (1 << 1)
5 #define UPIO_PORT (0)
6 #define UPIO_HUB6 (1)
7 #define UPIO_MEM (2)
8 #define UPIO_MEM32 (3)
9 #define UPIO_AU (4) /* Au1x00 type IO */
10 #define UPIO_TSI (5) /* Tsi108/109 type IO */
11 #define UPF_FOURPORT (1 << 1)
12 #define UPF_SAK (1 << 2)
13 #define UPF_SPD_MASK (0x1030)
14 #define UPF_SPD_HI (0x0010)
15 #define UPF_SPD_VHI (0x0020)
16 #define UPF_SPD_CUST (0x0030)
17 #define UPF_SPD_SHI (0x1000)
18 #define UPF_SPD_WARP (0x1010)
19 #define UPF_SKIP_TEST (1 << 6)
20 #define UPF_AUTO_IRQ (1 << 7)
21 #define UPF_HARDPPS_CD (1 << 11)
22 #define UPF_LOW_LATENCY (1 << 13)
23 #define UPF_BUGGY_UART (1 << 14)
24 #define UPF_MAGIC_MULTIPLIER (1 << 16)
25 #define UPF_CONS_FLOW (1 << 23)
26 #define UPF_SHARE_IRQ (1 << 24)
27 #define UPF_BOOT_AUTOCONF (1 << 28)
28 #define UPF_DEAD (1 << 30)
29 #define UPF_IOREMAP (1 << 31)
30 #define UPF_CHANGE_MASK (0x17fff)
31 #define UPF_USR_MASK (UPF_SPD_MASK|UPF_LOW_LATENCY)
32 #define USF_CLOSING_WAIT_INF (0)
33 #define USF_CLOSING_WAIT_NONE (~0U)
34
35 #define UART_XMIT_SIZE PAGE_SIZE
36
37 #define UIF_CHECK_CD (1 << 25)
38 #define UIF_CTS_FLOW (1 << 26)
39 #define UIF_NORMAL_ACTIVE (1 << 29)
40 #define UIF_INITIALIZED (1 << 31)
41 #define UIF_SUSPENDED (1 << 30)
42
43 #define WAKEUP_CHARS 256
44
45 #define uart_circ_empty(circ) ((circ)->head == (circ)->tail)
46 #define uart_circ_clear(circ) ((circ)->head = (circ)->tail = 0)
47
48 #define uart_circ_chars_pending(circ) \
49 (CIRC_CNT((circ)->head, (circ)->tail, UART_XMIT_SIZE))
50
51 #define uart_circ_chars_free(circ) \
52 (CIRC_SPACE((circ)->head, (circ)->tail, UART_XMIT_SIZE))
53
54 #define uart_tx_stopped(port) \
55 ((port)->info->tty->stopped || (port)->info->tty->hw_stopped)
56
57 #define UART_ENABLE_MS(port,cflag) ((port)->flags & UPF_HARDPPS_CD || \
58 (cflag) & CRTSCTS || \
59 !((cflag) & CLOCAL))
60
61
62 struct sb_uart_port;
63 struct sb_uart_info;
64 struct serial_struct;
65 struct device;
66
67 struct sb_uart_ops {
68 unsigned int (*tx_empty)(struct sb_uart_port *);
69 void (*set_mctrl)(struct sb_uart_port *, unsigned int mctrl);
70 unsigned int (*get_mctrl)(struct sb_uart_port *);
71 void (*stop_tx)(struct sb_uart_port *);
72 void (*start_tx)(struct sb_uart_port *);
73 void (*send_xchar)(struct sb_uart_port *, char ch);
74 void (*stop_rx)(struct sb_uart_port *);
75 void (*enable_ms)(struct sb_uart_port *);
76 void (*break_ctl)(struct sb_uart_port *, int ctl);
77 int (*startup)(struct sb_uart_port *);
78 void (*shutdown)(struct sb_uart_port *);
79 void (*set_termios)(struct sb_uart_port *, struct MP_TERMIOS *new,
80 struct MP_TERMIOS *old);
81 void (*pm)(struct sb_uart_port *, unsigned int state,
82 unsigned int oldstate);
83 int (*set_wake)(struct sb_uart_port *, unsigned int state);
84
85 const char *(*type)(struct sb_uart_port *);
86
87 void (*release_port)(struct sb_uart_port *);
88
89 int (*request_port)(struct sb_uart_port *);
90 void (*config_port)(struct sb_uart_port *, int);
91 int (*verify_port)(struct sb_uart_port *, struct serial_struct *);
92 int (*ioctl)(struct sb_uart_port *, unsigned int, unsigned long);
93 };
94
95
96 struct sb_uart_icount {
97 __u32 cts;
98 __u32 dsr;
99 __u32 rng;
100 __u32 dcd;
101 __u32 rx;
102 __u32 tx;
103 __u32 frame;
104 __u32 overrun;
105 __u32 parity;
106 __u32 brk;
107 __u32 buf_overrun;
108 };
109 typedef unsigned int upf_t;
110
111 struct sb_uart_port {
112 spinlock_t lock; /* port lock */
113 unsigned int iobase; /* in/out[bwl] */
114 unsigned char __iomem *membase; /* read/write[bwl] */
115 unsigned int irq; /* irq number */
116 unsigned int uartclk; /* base uart clock */
117 unsigned int fifosize; /* tx fifo size */
118 unsigned char x_char; /* xon/xoff char */
119 unsigned char regshift; /* reg offset shift */
120 unsigned char iotype; /* io access style */
121 unsigned char unused1;
122
123
124 unsigned int read_status_mask; /* driver specific */
125 unsigned int ignore_status_mask; /* driver specific */
126 struct sb_uart_info *info; /* pointer to parent info */
127 struct sb_uart_icount icount; /* statistics */
128
129 struct console *cons; /* struct console, if any */
130 #ifdef CONFIG_SERIAL_CORE_CONSOLE
131 unsigned long sysrq; /* sysrq timeout */
132 #endif
133
134 upf_t flags;
135
136 unsigned int mctrl; /* current modem ctrl settings */
137 unsigned int timeout; /* character-based timeout */
138 unsigned int type; /* port type */
139 const struct sb_uart_ops *ops;
140 unsigned int custom_divisor;
141 unsigned int line; /* port index */
142 unsigned long mapbase; /* for ioremap */
143 struct device *dev; /* parent device */
144 unsigned char hub6; /* this should be in the 8250 driver */
145 unsigned char unused[3];
146 };
147
148 #define mdmode unused[2]
149 #define MDMODE_ADDR 0x1
150 #define MDMODE_ENABLE 0x2
151 #define MDMODE_AUTO 0x4
152 #define MDMODE_ADDRSEND 0x8
153
154 struct sb_uart_state {
155 unsigned int close_delay; /* msec */
156 unsigned int closing_wait; /* msec */
157
158
159 int count;
160 int pm_state;
161 struct sb_uart_info *info;
162 struct sb_uart_port *port;
163
164 struct mutex mutex;
165 };
166
167 typedef unsigned int uif_t;
168
169 struct sb_uart_info {
170 struct tty_struct *tty;
171 struct circ_buf xmit;
172 uif_t flags;
173
174 int blocked_open;
175
176 struct tasklet_struct tlet;
177
178 wait_queue_head_t open_wait;
179 wait_queue_head_t delta_msr_wait;
180 };
181
182
183 struct module;
184 struct tty_driver;
185
186 struct uart_driver {
187 struct module *owner;
188 const char *driver_name;
189 const char *dev_name;
190 int major;
191 int minor;
192 int nr;
193 struct console *cons;
194
195 struct sb_uart_state *state;
196 struct tty_driver *tty_driver;
197 };
198
sb_uart_write_wakeup(struct sb_uart_port * port)199 void sb_uart_write_wakeup(struct sb_uart_port *port)
200 {
201 struct sb_uart_info *info = port->info;
202 tasklet_schedule(&info->tlet);
203 }
204
sb_uart_update_timeout(struct sb_uart_port * port,unsigned int cflag,unsigned int baud)205 void sb_uart_update_timeout(struct sb_uart_port *port, unsigned int cflag,
206 unsigned int baud)
207 {
208 unsigned int bits;
209
210 switch (cflag & CSIZE)
211 {
212 case CS5:
213 bits = 7;
214 break;
215
216 case CS6:
217 bits = 8;
218 break;
219
220 case CS7:
221 bits = 9;
222 break;
223
224 default:
225 bits = 10;
226 break;
227 }
228
229 if (cflag & CSTOPB)
230 {
231 bits++;
232 }
233
234 if (cflag & PARENB)
235 {
236 bits++;
237 }
238
239 bits = bits * port->fifosize;
240
241 port->timeout = (HZ * bits) / baud + HZ/50;
242 }
sb_uart_get_baud_rate(struct sb_uart_port * port,struct MP_TERMIOS * termios,struct MP_TERMIOS * old,unsigned int min,unsigned int max)243 unsigned int sb_uart_get_baud_rate(struct sb_uart_port *port, struct MP_TERMIOS *termios,
244 struct MP_TERMIOS *old, unsigned int min,
245 unsigned int max)
246 {
247 unsigned int try, baud, altbaud = 38400;
248 upf_t flags = port->flags & UPF_SPD_MASK;
249
250 if (flags == UPF_SPD_HI)
251 altbaud = 57600;
252 if (flags == UPF_SPD_VHI)
253 altbaud = 115200;
254 if (flags == UPF_SPD_SHI)
255 altbaud = 230400;
256 if (flags == UPF_SPD_WARP)
257 altbaud = 460800;
258
259 for (try = 0; try < 2; try++) {
260
261 switch (termios->c_cflag & (CBAUD | CBAUDEX))
262 {
263 case B921600 : baud = 921600; break;
264 case B460800 : baud = 460800; break;
265 case B230400 : baud = 230400; break;
266 case B115200 : baud = 115200; break;
267 case B57600 : baud = 57600; break;
268 case B38400 : baud = 38400; break;
269 case B19200 : baud = 19200; break;
270 case B9600 : baud = 9600; break;
271 case B4800 : baud = 4800; break;
272 case B2400 : baud = 2400; break;
273 case B1800 : baud = 1800; break;
274 case B1200 : baud = 1200; break;
275 case B600 : baud = 600; break;
276 case B300 : baud = 300; break;
277 case B200 : baud = 200; break;
278 case B150 : baud = 150; break;
279 case B134 : baud = 134; break;
280 case B110 : baud = 110; break;
281 case B75 : baud = 75; break;
282 case B50 : baud = 50; break;
283 default : baud = 9600; break;
284 }
285
286 if (baud == 38400)
287 baud = altbaud;
288
289 if (baud == 0)
290 baud = 9600;
291
292 if (baud >= min && baud <= max)
293 return baud;
294
295 termios->c_cflag &= ~CBAUD;
296 if (old) {
297 termios->c_cflag |= old->c_cflag & CBAUD;
298 old = NULL;
299 continue;
300 }
301
302 termios->c_cflag |= B9600;
303 }
304
305 return 0;
306 }
sb_uart_get_divisor(struct sb_uart_port * port,unsigned int baud)307 unsigned int sb_uart_get_divisor(struct sb_uart_port *port, unsigned int baud)
308 {
309 unsigned int quot;
310
311 if (baud == 38400 && (port->flags & UPF_SPD_MASK) == UPF_SPD_CUST)
312 quot = port->custom_divisor;
313 else
314 quot = (port->uartclk + (8 * baud)) / (16 * baud);
315
316 return quot;
317 }
318
319
320
sb_uart_handle_break(struct sb_uart_port * port)321 static inline int sb_uart_handle_break(struct sb_uart_port *port)
322 {
323 struct sb_uart_info *info = port->info;
324
325 if (port->flags & UPF_SAK)
326 do_SAK(info->tty);
327 return 0;
328 }
329
sb_uart_handle_dcd_change(struct sb_uart_port * port,unsigned int status)330 static inline void sb_uart_handle_dcd_change(struct sb_uart_port *port, unsigned int status)
331 {
332 struct sb_uart_info *info = port->info;
333
334 port->icount.dcd++;
335
336 if (info->flags & UIF_CHECK_CD) {
337 if (status)
338 wake_up_interruptible(&info->open_wait);
339 else if (info->tty)
340 tty_hangup(info->tty);
341 }
342 }
343
sb_uart_handle_cts_change(struct sb_uart_port * port,unsigned int status)344 static inline void sb_uart_handle_cts_change(struct sb_uart_port *port, unsigned int status)
345 {
346 struct sb_uart_info *info = port->info;
347 struct tty_struct *tty = info->tty;
348
349 port->icount.cts++;
350
351 if (info->flags & UIF_CTS_FLOW) {
352 if (tty->hw_stopped) {
353 if (status) {
354 tty->hw_stopped = 0;
355 port->ops->start_tx(port);
356 sb_uart_write_wakeup(port);
357 }
358 } else {
359 if (!status) {
360 tty->hw_stopped = 1;
361 port->ops->stop_tx(port);
362 }
363 }
364 }
365 }
366
367
368
369