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1// SPDX-License-Identifier: GPL-2.0
2/*
3 * Driver for the serial port on the 21285 StrongArm-110 core logic chip.
4 *
5 * Based on drivers/char/serial.c
6 */
7#include <linux/module.h>
8#include <linux/tty.h>
9#include <linux/ioport.h>
10#include <linux/init.h>
11#include <linux/console.h>
12#include <linux/device.h>
13#include <linux/tty_flip.h>
14#include <linux/serial_core.h>
15#include <linux/serial.h>
16#include <linux/io.h>
17
18#include <asm/irq.h>
19#include <asm/mach-types.h>
20#include <asm/system_info.h>
21#include <asm/hardware/dec21285.h>
22#include <mach/hardware.h>
23
24#define BAUD_BASE (mem_fclk_21285/64)
25
26#define SERIAL_21285_NAME "ttyFB"
27#define SERIAL_21285_MAJOR 204
28#define SERIAL_21285_MINOR 4
29
30#define RXSTAT_DUMMY_READ 0x80000000
31#define RXSTAT_FRAME (1 << 0)
32#define RXSTAT_PARITY (1 << 1)
33#define RXSTAT_OVERRUN (1 << 2)
34#define RXSTAT_ANYERR (RXSTAT_FRAME|RXSTAT_PARITY|RXSTAT_OVERRUN)
35
36#define H_UBRLCR_BREAK (1 << 0)
37#define H_UBRLCR_PARENB (1 << 1)
38#define H_UBRLCR_PAREVN (1 << 2)
39#define H_UBRLCR_STOPB (1 << 3)
40#define H_UBRLCR_FIFO (1 << 4)
41
42static const char serial21285_name[] = "Footbridge UART";
43
44/*
45 * We only need 2 bits of data, so instead of creating a whole structure for
46 * this, use bits of the private_data pointer of the uart port structure.
47 */
48#define tx_enabled_bit 0
49#define rx_enabled_bit 1
50
51static bool is_enabled(struct uart_port *port, int bit)
52{
53 unsigned long *private_data = (unsigned long *)&port->private_data;
54
55 if (test_bit(bit, private_data))
56 return true;
57 return false;
58}
59
60static void enable(struct uart_port *port, int bit)
61{
62 unsigned long *private_data = (unsigned long *)&port->private_data;
63
64 set_bit(bit, private_data);
65}
66
67static void disable(struct uart_port *port, int bit)
68{
69 unsigned long *private_data = (unsigned long *)&port->private_data;
70
71 clear_bit(bit, private_data);
72}
73
74#define is_tx_enabled(port) is_enabled(port, tx_enabled_bit)
75#define tx_enable(port) enable(port, tx_enabled_bit)
76#define tx_disable(port) disable(port, tx_enabled_bit)
77
78#define is_rx_enabled(port) is_enabled(port, rx_enabled_bit)
79#define rx_enable(port) enable(port, rx_enabled_bit)
80#define rx_disable(port) disable(port, rx_enabled_bit)
81
82/*
83 * The documented expression for selecting the divisor is:
84 * BAUD_BASE / baud - 1
85 * However, typically BAUD_BASE is not divisible by baud, so
86 * we want to select the divisor that gives us the minimum
87 * error. Therefore, we want:
88 * int(BAUD_BASE / baud - 0.5) ->
89 * int(BAUD_BASE / baud - (baud >> 1) / baud) ->
90 * int((BAUD_BASE - (baud >> 1)) / baud)
91 */
92
93static void serial21285_stop_tx(struct uart_port *port)
94{
95 if (is_tx_enabled(port)) {
96 disable_irq_nosync(IRQ_CONTX);
97 tx_disable(port);
98 }
99}
100
101static void serial21285_start_tx(struct uart_port *port)
102{
103 if (!is_tx_enabled(port)) {
104 enable_irq(IRQ_CONTX);
105 tx_enable(port);
106 }
107}
108
109static void serial21285_stop_rx(struct uart_port *port)
110{
111 if (is_rx_enabled(port)) {
112 disable_irq_nosync(IRQ_CONRX);
113 rx_disable(port);
114 }
115}
116
117static irqreturn_t serial21285_rx_chars(int irq, void *dev_id)
118{
119 struct uart_port *port = dev_id;
120 unsigned int status, rxs, max_count = 256;
121 u8 ch, flag;
122
123 status = *CSR_UARTFLG;
124 while (!(status & 0x10) && max_count--) {
125 ch = *CSR_UARTDR;
126 flag = TTY_NORMAL;
127 port->icount.rx++;
128
129 rxs = *CSR_RXSTAT | RXSTAT_DUMMY_READ;
130 if (unlikely(rxs & RXSTAT_ANYERR)) {
131 if (rxs & RXSTAT_PARITY)
132 port->icount.parity++;
133 else if (rxs & RXSTAT_FRAME)
134 port->icount.frame++;
135 if (rxs & RXSTAT_OVERRUN)
136 port->icount.overrun++;
137
138 rxs &= port->read_status_mask;
139
140 if (rxs & RXSTAT_PARITY)
141 flag = TTY_PARITY;
142 else if (rxs & RXSTAT_FRAME)
143 flag = TTY_FRAME;
144 }
145
146 uart_insert_char(port, rxs, RXSTAT_OVERRUN, ch, flag);
147
148 status = *CSR_UARTFLG;
149 }
150 tty_flip_buffer_push(&port->state->port);
151
152 return IRQ_HANDLED;
153}
154
155static irqreturn_t serial21285_tx_chars(int irq, void *dev_id)
156{
157 struct uart_port *port = dev_id;
158 u8 ch;
159
160 uart_port_tx_limited(port, ch, 256,
161 !(*CSR_UARTFLG & 0x20),
162 *CSR_UARTDR = ch,
163 ({}));
164
165 return IRQ_HANDLED;
166}
167
168static unsigned int serial21285_tx_empty(struct uart_port *port)
169{
170 return (*CSR_UARTFLG & 8) ? 0 : TIOCSER_TEMT;
171}
172
173/* no modem control lines */
174static unsigned int serial21285_get_mctrl(struct uart_port *port)
175{
176 return TIOCM_CAR | TIOCM_DSR | TIOCM_CTS;
177}
178
179static void serial21285_set_mctrl(struct uart_port *port, unsigned int mctrl)
180{
181}
182
183static void serial21285_break_ctl(struct uart_port *port, int break_state)
184{
185 unsigned long flags;
186 unsigned int h_lcr;
187
188 uart_port_lock_irqsave(port, &flags);
189 h_lcr = *CSR_H_UBRLCR;
190 if (break_state)
191 h_lcr |= H_UBRLCR_BREAK;
192 else
193 h_lcr &= ~H_UBRLCR_BREAK;
194 *CSR_H_UBRLCR = h_lcr;
195 uart_port_unlock_irqrestore(port, flags);
196}
197
198static int serial21285_startup(struct uart_port *port)
199{
200 int ret;
201
202 tx_enable(port);
203 rx_enable(port);
204
205 ret = request_irq(IRQ_CONRX, serial21285_rx_chars, 0,
206 serial21285_name, port);
207 if (ret == 0) {
208 ret = request_irq(IRQ_CONTX, serial21285_tx_chars, 0,
209 serial21285_name, port);
210 if (ret)
211 free_irq(IRQ_CONRX, port);
212 }
213
214 return ret;
215}
216
217static void serial21285_shutdown(struct uart_port *port)
218{
219 free_irq(IRQ_CONTX, port);
220 free_irq(IRQ_CONRX, port);
221}
222
223static void
224serial21285_set_termios(struct uart_port *port, struct ktermios *termios,
225 const struct ktermios *old)
226{
227 unsigned long flags;
228 unsigned int baud, quot, h_lcr, b;
229
230 /*
231 * We don't support modem control lines.
232 */
233 termios->c_cflag &= ~(HUPCL | CRTSCTS | CMSPAR);
234 termios->c_cflag |= CLOCAL;
235
236 /*
237 * We don't support BREAK character recognition.
238 */
239 termios->c_iflag &= ~(IGNBRK | BRKINT);
240
241 /*
242 * Ask the core to calculate the divisor for us.
243 */
244 baud = uart_get_baud_rate(port, termios, old, 0, port->uartclk/16);
245 quot = uart_get_divisor(port, baud);
246 b = port->uartclk / (16 * quot);
247 tty_termios_encode_baud_rate(termios, b, b);
248
249 switch (termios->c_cflag & CSIZE) {
250 case CS5:
251 h_lcr = 0x00;
252 break;
253 case CS6:
254 h_lcr = 0x20;
255 break;
256 case CS7:
257 h_lcr = 0x40;
258 break;
259 default: /* CS8 */
260 h_lcr = 0x60;
261 break;
262 }
263
264 if (termios->c_cflag & CSTOPB)
265 h_lcr |= H_UBRLCR_STOPB;
266 if (termios->c_cflag & PARENB) {
267 h_lcr |= H_UBRLCR_PARENB;
268 if (!(termios->c_cflag & PARODD))
269 h_lcr |= H_UBRLCR_PAREVN;
270 }
271
272 if (port->fifosize)
273 h_lcr |= H_UBRLCR_FIFO;
274
275 uart_port_lock_irqsave(port, &flags);
276
277 /*
278 * Update the per-port timeout.
279 */
280 uart_update_timeout(port, termios->c_cflag, baud);
281
282 /*
283 * Which character status flags are we interested in?
284 */
285 port->read_status_mask = RXSTAT_OVERRUN;
286 if (termios->c_iflag & INPCK)
287 port->read_status_mask |= RXSTAT_FRAME | RXSTAT_PARITY;
288
289 /*
290 * Which character status flags should we ignore?
291 */
292 port->ignore_status_mask = 0;
293 if (termios->c_iflag & IGNPAR)
294 port->ignore_status_mask |= RXSTAT_FRAME | RXSTAT_PARITY;
295 if (termios->c_iflag & IGNBRK && termios->c_iflag & IGNPAR)
296 port->ignore_status_mask |= RXSTAT_OVERRUN;
297
298 /*
299 * Ignore all characters if CREAD is not set.
300 */
301 if ((termios->c_cflag & CREAD) == 0)
302 port->ignore_status_mask |= RXSTAT_DUMMY_READ;
303
304 quot -= 1;
305
306 *CSR_UARTCON = 0;
307 *CSR_L_UBRLCR = quot & 0xff;
308 *CSR_M_UBRLCR = (quot >> 8) & 0x0f;
309 *CSR_H_UBRLCR = h_lcr;
310 *CSR_UARTCON = 1;
311
312 uart_port_unlock_irqrestore(port, flags);
313}
314
315static const char *serial21285_type(struct uart_port *port)
316{
317 return port->type == PORT_21285 ? "DC21285" : NULL;
318}
319
320static void serial21285_release_port(struct uart_port *port)
321{
322 release_mem_region(port->mapbase, 32);
323}
324
325static int serial21285_request_port(struct uart_port *port)
326{
327 return request_mem_region(port->mapbase, 32, serial21285_name)
328 != NULL ? 0 : -EBUSY;
329}
330
331static void serial21285_config_port(struct uart_port *port, int flags)
332{
333 if (flags & UART_CONFIG_TYPE && serial21285_request_port(port) == 0)
334 port->type = PORT_21285;
335}
336
337/*
338 * verify the new serial_struct (for TIOCSSERIAL).
339 */
340static int serial21285_verify_port(struct uart_port *port, struct serial_struct *ser)
341{
342 int ret = 0;
343 if (ser->type != PORT_UNKNOWN && ser->type != PORT_21285)
344 ret = -EINVAL;
345 if (ser->irq <= 0)
346 ret = -EINVAL;
347 if (ser->baud_base != port->uartclk / 16)
348 ret = -EINVAL;
349 return ret;
350}
351
352static const struct uart_ops serial21285_ops = {
353 .tx_empty = serial21285_tx_empty,
354 .get_mctrl = serial21285_get_mctrl,
355 .set_mctrl = serial21285_set_mctrl,
356 .stop_tx = serial21285_stop_tx,
357 .start_tx = serial21285_start_tx,
358 .stop_rx = serial21285_stop_rx,
359 .break_ctl = serial21285_break_ctl,
360 .startup = serial21285_startup,
361 .shutdown = serial21285_shutdown,
362 .set_termios = serial21285_set_termios,
363 .type = serial21285_type,
364 .release_port = serial21285_release_port,
365 .request_port = serial21285_request_port,
366 .config_port = serial21285_config_port,
367 .verify_port = serial21285_verify_port,
368};
369
370static struct uart_port serial21285_port = {
371 .mapbase = 0x42000160,
372 .iotype = UPIO_MEM,
373 .irq = 0,
374 .fifosize = 16,
375 .ops = &serial21285_ops,
376 .flags = UPF_BOOT_AUTOCONF,
377};
378
379static void serial21285_setup_ports(void)
380{
381 serial21285_port.uartclk = mem_fclk_21285 / 4;
382}
383
384#ifdef CONFIG_SERIAL_21285_CONSOLE
385static void serial21285_console_putchar(struct uart_port *port, unsigned char ch)
386{
387 while (*CSR_UARTFLG & 0x20)
388 barrier();
389 *CSR_UARTDR = ch;
390}
391
392static void
393serial21285_console_write(struct console *co, const char *s,
394 unsigned int count)
395{
396 uart_console_write(&serial21285_port, s, count, serial21285_console_putchar);
397}
398
399static void __init
400serial21285_get_options(struct uart_port *port, int *baud,
401 int *parity, int *bits)
402{
403 if (*CSR_UARTCON == 1) {
404 unsigned int tmp;
405
406 tmp = *CSR_H_UBRLCR;
407 switch (tmp & 0x60) {
408 case 0x00:
409 *bits = 5;
410 break;
411 case 0x20:
412 *bits = 6;
413 break;
414 case 0x40:
415 *bits = 7;
416 break;
417 default:
418 case 0x60:
419 *bits = 8;
420 break;
421 }
422
423 if (tmp & H_UBRLCR_PARENB) {
424 *parity = 'o';
425 if (tmp & H_UBRLCR_PAREVN)
426 *parity = 'e';
427 }
428
429 tmp = *CSR_L_UBRLCR | (*CSR_M_UBRLCR << 8);
430
431 *baud = port->uartclk / (16 * (tmp + 1));
432 }
433}
434
435static int __init serial21285_console_setup(struct console *co, char *options)
436{
437 struct uart_port *port = &serial21285_port;
438 int baud = 9600;
439 int bits = 8;
440 int parity = 'n';
441 int flow = 'n';
442
443 /*
444 * Check whether an invalid uart number has been specified, and
445 * if so, search for the first available port that does have
446 * console support.
447 */
448 if (options)
449 uart_parse_options(options, &baud, &parity, &bits, &flow);
450 else
451 serial21285_get_options(port, &baud, &parity, &bits);
452
453 return uart_set_options(port, co, baud, parity, bits, flow);
454}
455
456static struct uart_driver serial21285_reg;
457
458static struct console serial21285_console =
459{
460 .name = SERIAL_21285_NAME,
461 .write = serial21285_console_write,
462 .device = uart_console_device,
463 .setup = serial21285_console_setup,
464 .flags = CON_PRINTBUFFER,
465 .index = -1,
466 .data = &serial21285_reg,
467};
468
469static int __init rs285_console_init(void)
470{
471 serial21285_setup_ports();
472 register_console(&serial21285_console);
473 return 0;
474}
475console_initcall(rs285_console_init);
476
477#define SERIAL_21285_CONSOLE &serial21285_console
478#else
479#define SERIAL_21285_CONSOLE NULL
480#endif
481
482static struct uart_driver serial21285_reg = {
483 .owner = THIS_MODULE,
484 .driver_name = "ttyFB",
485 .dev_name = "ttyFB",
486 .major = SERIAL_21285_MAJOR,
487 .minor = SERIAL_21285_MINOR,
488 .nr = 1,
489 .cons = SERIAL_21285_CONSOLE,
490};
491
492static int __init serial21285_init(void)
493{
494 int ret;
495
496 printk(KERN_INFO "Serial: 21285 driver\n");
497
498 serial21285_setup_ports();
499
500 ret = uart_register_driver(&serial21285_reg);
501 if (ret == 0)
502 uart_add_one_port(&serial21285_reg, &serial21285_port);
503
504 return ret;
505}
506
507static void __exit serial21285_exit(void)
508{
509 uart_remove_one_port(&serial21285_reg, &serial21285_port);
510 uart_unregister_driver(&serial21285_reg);
511}
512
513module_init(serial21285_init);
514module_exit(serial21285_exit);
515
516MODULE_LICENSE("GPL");
517MODULE_DESCRIPTION("Intel Footbridge (21285) serial driver");
518MODULE_ALIAS_CHARDEV(SERIAL_21285_MAJOR, SERIAL_21285_MINOR);
1/*
2 * Driver for the serial port on the 21285 StrongArm-110 core logic chip.
3 *
4 * Based on drivers/char/serial.c
5 */
6#include <linux/module.h>
7#include <linux/tty.h>
8#include <linux/ioport.h>
9#include <linux/init.h>
10#include <linux/console.h>
11#include <linux/device.h>
12#include <linux/tty_flip.h>
13#include <linux/serial_core.h>
14#include <linux/serial.h>
15#include <linux/io.h>
16
17#include <asm/irq.h>
18#include <asm/mach-types.h>
19#include <asm/system_info.h>
20#include <asm/hardware/dec21285.h>
21#include <mach/hardware.h>
22
23#define BAUD_BASE (mem_fclk_21285/64)
24
25#define SERIAL_21285_NAME "ttyFB"
26#define SERIAL_21285_MAJOR 204
27#define SERIAL_21285_MINOR 4
28
29#define RXSTAT_DUMMY_READ 0x80000000
30#define RXSTAT_FRAME (1 << 0)
31#define RXSTAT_PARITY (1 << 1)
32#define RXSTAT_OVERRUN (1 << 2)
33#define RXSTAT_ANYERR (RXSTAT_FRAME|RXSTAT_PARITY|RXSTAT_OVERRUN)
34
35#define H_UBRLCR_BREAK (1 << 0)
36#define H_UBRLCR_PARENB (1 << 1)
37#define H_UBRLCR_PAREVN (1 << 2)
38#define H_UBRLCR_STOPB (1 << 3)
39#define H_UBRLCR_FIFO (1 << 4)
40
41static const char serial21285_name[] = "Footbridge UART";
42
43#define tx_enabled(port) ((port)->unused[0])
44#define rx_enabled(port) ((port)->unused[1])
45
46/*
47 * The documented expression for selecting the divisor is:
48 * BAUD_BASE / baud - 1
49 * However, typically BAUD_BASE is not divisible by baud, so
50 * we want to select the divisor that gives us the minimum
51 * error. Therefore, we want:
52 * int(BAUD_BASE / baud - 0.5) ->
53 * int(BAUD_BASE / baud - (baud >> 1) / baud) ->
54 * int((BAUD_BASE - (baud >> 1)) / baud)
55 */
56
57static void serial21285_stop_tx(struct uart_port *port)
58{
59 if (tx_enabled(port)) {
60 disable_irq_nosync(IRQ_CONTX);
61 tx_enabled(port) = 0;
62 }
63}
64
65static void serial21285_start_tx(struct uart_port *port)
66{
67 if (!tx_enabled(port)) {
68 enable_irq(IRQ_CONTX);
69 tx_enabled(port) = 1;
70 }
71}
72
73static void serial21285_stop_rx(struct uart_port *port)
74{
75 if (rx_enabled(port)) {
76 disable_irq_nosync(IRQ_CONRX);
77 rx_enabled(port) = 0;
78 }
79}
80
81static void serial21285_enable_ms(struct uart_port *port)
82{
83}
84
85static irqreturn_t serial21285_rx_chars(int irq, void *dev_id)
86{
87 struct uart_port *port = dev_id;
88 struct tty_struct *tty = port->state->port.tty;
89 unsigned int status, ch, flag, rxs, max_count = 256;
90
91 status = *CSR_UARTFLG;
92 while (!(status & 0x10) && max_count--) {
93 ch = *CSR_UARTDR;
94 flag = TTY_NORMAL;
95 port->icount.rx++;
96
97 rxs = *CSR_RXSTAT | RXSTAT_DUMMY_READ;
98 if (unlikely(rxs & RXSTAT_ANYERR)) {
99 if (rxs & RXSTAT_PARITY)
100 port->icount.parity++;
101 else if (rxs & RXSTAT_FRAME)
102 port->icount.frame++;
103 if (rxs & RXSTAT_OVERRUN)
104 port->icount.overrun++;
105
106 rxs &= port->read_status_mask;
107
108 if (rxs & RXSTAT_PARITY)
109 flag = TTY_PARITY;
110 else if (rxs & RXSTAT_FRAME)
111 flag = TTY_FRAME;
112 }
113
114 uart_insert_char(port, rxs, RXSTAT_OVERRUN, ch, flag);
115
116 status = *CSR_UARTFLG;
117 }
118 tty_flip_buffer_push(tty);
119
120 return IRQ_HANDLED;
121}
122
123static irqreturn_t serial21285_tx_chars(int irq, void *dev_id)
124{
125 struct uart_port *port = dev_id;
126 struct circ_buf *xmit = &port->state->xmit;
127 int count = 256;
128
129 if (port->x_char) {
130 *CSR_UARTDR = port->x_char;
131 port->icount.tx++;
132 port->x_char = 0;
133 goto out;
134 }
135 if (uart_circ_empty(xmit) || uart_tx_stopped(port)) {
136 serial21285_stop_tx(port);
137 goto out;
138 }
139
140 do {
141 *CSR_UARTDR = xmit->buf[xmit->tail];
142 xmit->tail = (xmit->tail + 1) & (UART_XMIT_SIZE - 1);
143 port->icount.tx++;
144 if (uart_circ_empty(xmit))
145 break;
146 } while (--count > 0 && !(*CSR_UARTFLG & 0x20));
147
148 if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS)
149 uart_write_wakeup(port);
150
151 if (uart_circ_empty(xmit))
152 serial21285_stop_tx(port);
153
154 out:
155 return IRQ_HANDLED;
156}
157
158static unsigned int serial21285_tx_empty(struct uart_port *port)
159{
160 return (*CSR_UARTFLG & 8) ? 0 : TIOCSER_TEMT;
161}
162
163/* no modem control lines */
164static unsigned int serial21285_get_mctrl(struct uart_port *port)
165{
166 return TIOCM_CAR | TIOCM_DSR | TIOCM_CTS;
167}
168
169static void serial21285_set_mctrl(struct uart_port *port, unsigned int mctrl)
170{
171}
172
173static void serial21285_break_ctl(struct uart_port *port, int break_state)
174{
175 unsigned long flags;
176 unsigned int h_lcr;
177
178 spin_lock_irqsave(&port->lock, flags);
179 h_lcr = *CSR_H_UBRLCR;
180 if (break_state)
181 h_lcr |= H_UBRLCR_BREAK;
182 else
183 h_lcr &= ~H_UBRLCR_BREAK;
184 *CSR_H_UBRLCR = h_lcr;
185 spin_unlock_irqrestore(&port->lock, flags);
186}
187
188static int serial21285_startup(struct uart_port *port)
189{
190 int ret;
191
192 tx_enabled(port) = 1;
193 rx_enabled(port) = 1;
194
195 ret = request_irq(IRQ_CONRX, serial21285_rx_chars, 0,
196 serial21285_name, port);
197 if (ret == 0) {
198 ret = request_irq(IRQ_CONTX, serial21285_tx_chars, 0,
199 serial21285_name, port);
200 if (ret)
201 free_irq(IRQ_CONRX, port);
202 }
203
204 return ret;
205}
206
207static void serial21285_shutdown(struct uart_port *port)
208{
209 free_irq(IRQ_CONTX, port);
210 free_irq(IRQ_CONRX, port);
211}
212
213static void
214serial21285_set_termios(struct uart_port *port, struct ktermios *termios,
215 struct ktermios *old)
216{
217 unsigned long flags;
218 unsigned int baud, quot, h_lcr, b;
219
220 /*
221 * We don't support modem control lines.
222 */
223 termios->c_cflag &= ~(HUPCL | CRTSCTS | CMSPAR);
224 termios->c_cflag |= CLOCAL;
225
226 /*
227 * We don't support BREAK character recognition.
228 */
229 termios->c_iflag &= ~(IGNBRK | BRKINT);
230
231 /*
232 * Ask the core to calculate the divisor for us.
233 */
234 baud = uart_get_baud_rate(port, termios, old, 0, port->uartclk/16);
235 quot = uart_get_divisor(port, baud);
236 b = port->uartclk / (16 * quot);
237 tty_termios_encode_baud_rate(termios, b, b);
238
239 switch (termios->c_cflag & CSIZE) {
240 case CS5:
241 h_lcr = 0x00;
242 break;
243 case CS6:
244 h_lcr = 0x20;
245 break;
246 case CS7:
247 h_lcr = 0x40;
248 break;
249 default: /* CS8 */
250 h_lcr = 0x60;
251 break;
252 }
253
254 if (termios->c_cflag & CSTOPB)
255 h_lcr |= H_UBRLCR_STOPB;
256 if (termios->c_cflag & PARENB) {
257 h_lcr |= H_UBRLCR_PARENB;
258 if (!(termios->c_cflag & PARODD))
259 h_lcr |= H_UBRLCR_PAREVN;
260 }
261
262 if (port->fifosize)
263 h_lcr |= H_UBRLCR_FIFO;
264
265 spin_lock_irqsave(&port->lock, flags);
266
267 /*
268 * Update the per-port timeout.
269 */
270 uart_update_timeout(port, termios->c_cflag, baud);
271
272 /*
273 * Which character status flags are we interested in?
274 */
275 port->read_status_mask = RXSTAT_OVERRUN;
276 if (termios->c_iflag & INPCK)
277 port->read_status_mask |= RXSTAT_FRAME | RXSTAT_PARITY;
278
279 /*
280 * Which character status flags should we ignore?
281 */
282 port->ignore_status_mask = 0;
283 if (termios->c_iflag & IGNPAR)
284 port->ignore_status_mask |= RXSTAT_FRAME | RXSTAT_PARITY;
285 if (termios->c_iflag & IGNBRK && termios->c_iflag & IGNPAR)
286 port->ignore_status_mask |= RXSTAT_OVERRUN;
287
288 /*
289 * Ignore all characters if CREAD is not set.
290 */
291 if ((termios->c_cflag & CREAD) == 0)
292 port->ignore_status_mask |= RXSTAT_DUMMY_READ;
293
294 quot -= 1;
295
296 *CSR_UARTCON = 0;
297 *CSR_L_UBRLCR = quot & 0xff;
298 *CSR_M_UBRLCR = (quot >> 8) & 0x0f;
299 *CSR_H_UBRLCR = h_lcr;
300 *CSR_UARTCON = 1;
301
302 spin_unlock_irqrestore(&port->lock, flags);
303}
304
305static const char *serial21285_type(struct uart_port *port)
306{
307 return port->type == PORT_21285 ? "DC21285" : NULL;
308}
309
310static void serial21285_release_port(struct uart_port *port)
311{
312 release_mem_region(port->mapbase, 32);
313}
314
315static int serial21285_request_port(struct uart_port *port)
316{
317 return request_mem_region(port->mapbase, 32, serial21285_name)
318 != NULL ? 0 : -EBUSY;
319}
320
321static void serial21285_config_port(struct uart_port *port, int flags)
322{
323 if (flags & UART_CONFIG_TYPE && serial21285_request_port(port) == 0)
324 port->type = PORT_21285;
325}
326
327/*
328 * verify the new serial_struct (for TIOCSSERIAL).
329 */
330static int serial21285_verify_port(struct uart_port *port, struct serial_struct *ser)
331{
332 int ret = 0;
333 if (ser->type != PORT_UNKNOWN && ser->type != PORT_21285)
334 ret = -EINVAL;
335 if (ser->irq <= 0)
336 ret = -EINVAL;
337 if (ser->baud_base != port->uartclk / 16)
338 ret = -EINVAL;
339 return ret;
340}
341
342static struct uart_ops serial21285_ops = {
343 .tx_empty = serial21285_tx_empty,
344 .get_mctrl = serial21285_get_mctrl,
345 .set_mctrl = serial21285_set_mctrl,
346 .stop_tx = serial21285_stop_tx,
347 .start_tx = serial21285_start_tx,
348 .stop_rx = serial21285_stop_rx,
349 .enable_ms = serial21285_enable_ms,
350 .break_ctl = serial21285_break_ctl,
351 .startup = serial21285_startup,
352 .shutdown = serial21285_shutdown,
353 .set_termios = serial21285_set_termios,
354 .type = serial21285_type,
355 .release_port = serial21285_release_port,
356 .request_port = serial21285_request_port,
357 .config_port = serial21285_config_port,
358 .verify_port = serial21285_verify_port,
359};
360
361static struct uart_port serial21285_port = {
362 .mapbase = 0x42000160,
363 .iotype = UPIO_MEM,
364 .irq = 0,
365 .fifosize = 16,
366 .ops = &serial21285_ops,
367 .flags = UPF_BOOT_AUTOCONF,
368};
369
370static void serial21285_setup_ports(void)
371{
372 serial21285_port.uartclk = mem_fclk_21285 / 4;
373}
374
375#ifdef CONFIG_SERIAL_21285_CONSOLE
376static void serial21285_console_putchar(struct uart_port *port, int ch)
377{
378 while (*CSR_UARTFLG & 0x20)
379 barrier();
380 *CSR_UARTDR = ch;
381}
382
383static void
384serial21285_console_write(struct console *co, const char *s,
385 unsigned int count)
386{
387 uart_console_write(&serial21285_port, s, count, serial21285_console_putchar);
388}
389
390static void __init
391serial21285_get_options(struct uart_port *port, int *baud,
392 int *parity, int *bits)
393{
394 if (*CSR_UARTCON == 1) {
395 unsigned int tmp;
396
397 tmp = *CSR_H_UBRLCR;
398 switch (tmp & 0x60) {
399 case 0x00:
400 *bits = 5;
401 break;
402 case 0x20:
403 *bits = 6;
404 break;
405 case 0x40:
406 *bits = 7;
407 break;
408 default:
409 case 0x60:
410 *bits = 8;
411 break;
412 }
413
414 if (tmp & H_UBRLCR_PARENB) {
415 *parity = 'o';
416 if (tmp & H_UBRLCR_PAREVN)
417 *parity = 'e';
418 }
419
420 tmp = *CSR_L_UBRLCR | (*CSR_M_UBRLCR << 8);
421
422 *baud = port->uartclk / (16 * (tmp + 1));
423 }
424}
425
426static int __init serial21285_console_setup(struct console *co, char *options)
427{
428 struct uart_port *port = &serial21285_port;
429 int baud = 9600;
430 int bits = 8;
431 int parity = 'n';
432 int flow = 'n';
433
434 if (machine_is_personal_server())
435 baud = 57600;
436
437 /*
438 * Check whether an invalid uart number has been specified, and
439 * if so, search for the first available port that does have
440 * console support.
441 */
442 if (options)
443 uart_parse_options(options, &baud, &parity, &bits, &flow);
444 else
445 serial21285_get_options(port, &baud, &parity, &bits);
446
447 return uart_set_options(port, co, baud, parity, bits, flow);
448}
449
450static struct uart_driver serial21285_reg;
451
452static struct console serial21285_console =
453{
454 .name = SERIAL_21285_NAME,
455 .write = serial21285_console_write,
456 .device = uart_console_device,
457 .setup = serial21285_console_setup,
458 .flags = CON_PRINTBUFFER,
459 .index = -1,
460 .data = &serial21285_reg,
461};
462
463static int __init rs285_console_init(void)
464{
465 serial21285_setup_ports();
466 register_console(&serial21285_console);
467 return 0;
468}
469console_initcall(rs285_console_init);
470
471#define SERIAL_21285_CONSOLE &serial21285_console
472#else
473#define SERIAL_21285_CONSOLE NULL
474#endif
475
476static struct uart_driver serial21285_reg = {
477 .owner = THIS_MODULE,
478 .driver_name = "ttyFB",
479 .dev_name = "ttyFB",
480 .major = SERIAL_21285_MAJOR,
481 .minor = SERIAL_21285_MINOR,
482 .nr = 1,
483 .cons = SERIAL_21285_CONSOLE,
484};
485
486static int __init serial21285_init(void)
487{
488 int ret;
489
490 printk(KERN_INFO "Serial: 21285 driver\n");
491
492 serial21285_setup_ports();
493
494 ret = uart_register_driver(&serial21285_reg);
495 if (ret == 0)
496 uart_add_one_port(&serial21285_reg, &serial21285_port);
497
498 return ret;
499}
500
501static void __exit serial21285_exit(void)
502{
503 uart_remove_one_port(&serial21285_reg, &serial21285_port);
504 uart_unregister_driver(&serial21285_reg);
505}
506
507module_init(serial21285_init);
508module_exit(serial21285_exit);
509
510MODULE_LICENSE("GPL");
511MODULE_DESCRIPTION("Intel Footbridge (21285) serial driver");
512MODULE_ALIAS_CHARDEV(SERIAL_21285_MAJOR, SERIAL_21285_MINOR);