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bna: use device model DMA API
[linux/fpc-iii.git] / drivers / tty / serial / mfd.c
blobd40010a22ecd788e6d90c69337333c7bed0bfc7b
1 /*
2 * mfd.c: driver for High Speed UART device of Intel Medfield platform
3 *
4 * Refer pxa.c, 8250.c and some other drivers in drivers/serial/
5 *
6 * (C) Copyright 2010 Intel Corporation
7 *
8 * This program is free software; you can redistribute it and/or
9 * modify it under the terms of the GNU General Public License
10 * as published by the Free Software Foundation; version 2
11 * of the License.
12 */
13
14 /* Notes:
15 * 1. DMA channel allocation: 0/1 channel are assigned to port 0,
16 * 2/3 chan to port 1, 4/5 chan to port 3. Even number chans
17 * are used for RX, odd chans for TX
18 *
19 * 2. In A0 stepping, UART will not support TX half empty flag
20 *
21 * 3. The RI/DSR/DCD/DTR are not pinned out, DCD & DSR are always
22 * asserted, only when the HW is reset the DDCD and DDSR will
23 * be triggered
24 */
25
26 #include <linux/module.h>
27 #include <linux/init.h>
28 #include <linux/console.h>
29 #include <linux/sysrq.h>
30 #include <linux/slab.h>
31 #include <linux/serial_reg.h>
32 #include <linux/circ_buf.h>
33 #include <linux/delay.h>
34 #include <linux/interrupt.h>
35 #include <linux/tty.h>
36 #include <linux/tty_flip.h>
37 #include <linux/serial_core.h>
38 #include <linux/serial_mfd.h>
39 #include <linux/dma-mapping.h>
40 #include <linux/pci.h>
41 #include <linux/io.h>
42 #include <linux/debugfs.h>
43
44 #define MFD_HSU_A0_STEPPING 1
45
46 #define HSU_DMA_BUF_SIZE 2048
47
48 #define chan_readl(chan, offset) readl(chan->reg + offset)
49 #define chan_writel(chan, offset, val) writel(val, chan->reg + offset)
50
51 #define mfd_readl(obj, offset) readl(obj->reg + offset)
52 #define mfd_writel(obj, offset, val) writel(val, obj->reg + offset)
53
54 #define HSU_DMA_TIMEOUT_CHECK_FREQ (HZ/10)
55
56 struct hsu_dma_buffer {
57 u8 *buf;
58 dma_addr_t dma_addr;
59 u32 dma_size;
60 u32 ofs;
61 };
62
63 struct hsu_dma_chan {
64 u32 id;
65 enum dma_data_direction dirt;
66 struct uart_hsu_port *uport;
67 void __iomem *reg;
68 struct timer_list rx_timer; /* only needed by RX channel */
69 };
70
71 struct uart_hsu_port {
72 struct uart_port port;
73 unsigned char ier;
74 unsigned char lcr;
75 unsigned char mcr;
76 unsigned int lsr_break_flag;
77 char name[12];
78 int index;
79 struct device *dev;
80
81 struct hsu_dma_chan *txc;
82 struct hsu_dma_chan *rxc;
83 struct hsu_dma_buffer txbuf;
84 struct hsu_dma_buffer rxbuf;
85 int use_dma; /* flag for DMA/PIO */
86 int running;
87 int dma_tx_on;
88 };
89
90 /* Top level data structure of HSU */
91 struct hsu_port {
92 void __iomem *reg;
93 unsigned long paddr;
94 unsigned long iolen;
95 u32 irq;
96
97 struct uart_hsu_port port[3];
98 struct hsu_dma_chan chans[10];
99
100 struct dentry *debugfs;
101 };
102
103 static inline unsigned int serial_in(struct uart_hsu_port *up, int offset)
104 {
105 unsigned int val;
106
107 if (offset > UART_MSR) {
108 offset <<= 2;
109 val = readl(up->port.membase + offset);
110 } else
111 val = (unsigned int)readb(up->port.membase + offset);
112
113 return val;
114 }
115
116 static inline void serial_out(struct uart_hsu_port *up, int offset, int value)
117 {
118 if (offset > UART_MSR) {
119 offset <<= 2;
120 writel(value, up->port.membase + offset);
121 } else {
122 unsigned char val = value & 0xff;
123 writeb(val, up->port.membase + offset);
124 }
125 }
126
127 #ifdef CONFIG_DEBUG_FS
128
129 #define HSU_REGS_BUFSIZE 1024
130
131 static int hsu_show_regs_open(struct inode *inode, struct file *file)
132 {
133 file->private_data = inode->i_private;
134 return 0;
135 }
136
137 static ssize_t port_show_regs(struct file *file, char __user *user_buf,
138 size_t count, loff_t *ppos)
139 {
140 struct uart_hsu_port *up = file->private_data;
141 char *buf;
142 u32 len = 0;
143 ssize_t ret;
144
145 buf = kzalloc(HSU_REGS_BUFSIZE, GFP_KERNEL);
146 if (!buf)
147 return 0;
148
149 len += snprintf(buf + len, HSU_REGS_BUFSIZE - len,
150 "MFD HSU port[%d] regs:\n", up->index);
151
152 len += snprintf(buf + len, HSU_REGS_BUFSIZE - len,
153 "=================================\n");
154 len += snprintf(buf + len, HSU_REGS_BUFSIZE - len,
155 "IER: \t\t0x%08x\n", serial_in(up, UART_IER));
156 len += snprintf(buf + len, HSU_REGS_BUFSIZE - len,
157 "IIR: \t\t0x%08x\n", serial_in(up, UART_IIR));
158 len += snprintf(buf + len, HSU_REGS_BUFSIZE - len,
159 "LCR: \t\t0x%08x\n", serial_in(up, UART_LCR));
160 len += snprintf(buf + len, HSU_REGS_BUFSIZE - len,
161 "MCR: \t\t0x%08x\n", serial_in(up, UART_MCR));
162 len += snprintf(buf + len, HSU_REGS_BUFSIZE - len,
163 "LSR: \t\t0x%08x\n", serial_in(up, UART_LSR));
164 len += snprintf(buf + len, HSU_REGS_BUFSIZE - len,
165 "MSR: \t\t0x%08x\n", serial_in(up, UART_MSR));
166 len += snprintf(buf + len, HSU_REGS_BUFSIZE - len,
167 "FOR: \t\t0x%08x\n", serial_in(up, UART_FOR));
168 len += snprintf(buf + len, HSU_REGS_BUFSIZE - len,
169 "PS: \t\t0x%08x\n", serial_in(up, UART_PS));
170 len += snprintf(buf + len, HSU_REGS_BUFSIZE - len,
171 "MUL: \t\t0x%08x\n", serial_in(up, UART_MUL));
172 len += snprintf(buf + len, HSU_REGS_BUFSIZE - len,
173 "DIV: \t\t0x%08x\n", serial_in(up, UART_DIV));
174
175 if (len > HSU_REGS_BUFSIZE)
176 len = HSU_REGS_BUFSIZE;
177
178 ret = simple_read_from_buffer(user_buf, count, ppos, buf, len);
179 kfree(buf);
180 return ret;
181 }
182
183 static ssize_t dma_show_regs(struct file *file, char __user *user_buf,
184 size_t count, loff_t *ppos)
185 {
186 struct hsu_dma_chan *chan = file->private_data;
187 char *buf;
188 u32 len = 0;
189 ssize_t ret;
190
191 buf = kzalloc(HSU_REGS_BUFSIZE, GFP_KERNEL);
192 if (!buf)
193 return 0;
194
195 len += snprintf(buf + len, HSU_REGS_BUFSIZE - len,
196 "MFD HSU DMA channel [%d] regs:\n", chan->id);
197
198 len += snprintf(buf + len, HSU_REGS_BUFSIZE - len,
199 "=================================\n");
200 len += snprintf(buf + len, HSU_REGS_BUFSIZE - len,
201 "CR: \t\t0x%08x\n", chan_readl(chan, HSU_CH_CR));
202 len += snprintf(buf + len, HSU_REGS_BUFSIZE - len,
203 "DCR: \t\t0x%08x\n", chan_readl(chan, HSU_CH_DCR));
204 len += snprintf(buf + len, HSU_REGS_BUFSIZE - len,
205 "BSR: \t\t0x%08x\n", chan_readl(chan, HSU_CH_BSR));
206 len += snprintf(buf + len, HSU_REGS_BUFSIZE - len,
207 "MOTSR: \t\t0x%08x\n", chan_readl(chan, HSU_CH_MOTSR));
208 len += snprintf(buf + len, HSU_REGS_BUFSIZE - len,
209 "D0SAR: \t\t0x%08x\n", chan_readl(chan, HSU_CH_D0SAR));
210 len += snprintf(buf + len, HSU_REGS_BUFSIZE - len,
211 "D0TSR: \t\t0x%08x\n", chan_readl(chan, HSU_CH_D0TSR));
212 len += snprintf(buf + len, HSU_REGS_BUFSIZE - len,
213 "D0SAR: \t\t0x%08x\n", chan_readl(chan, HSU_CH_D1SAR));
214 len += snprintf(buf + len, HSU_REGS_BUFSIZE - len,
215 "D0TSR: \t\t0x%08x\n", chan_readl(chan, HSU_CH_D1TSR));
216 len += snprintf(buf + len, HSU_REGS_BUFSIZE - len,
217 "D0SAR: \t\t0x%08x\n", chan_readl(chan, HSU_CH_D2SAR));
218 len += snprintf(buf + len, HSU_REGS_BUFSIZE - len,
219 "D0TSR: \t\t0x%08x\n", chan_readl(chan, HSU_CH_D2TSR));
220 len += snprintf(buf + len, HSU_REGS_BUFSIZE - len,
221 "D0SAR: \t\t0x%08x\n", chan_readl(chan, HSU_CH_D3SAR));
222 len += snprintf(buf + len, HSU_REGS_BUFSIZE - len,
223 "D0TSR: \t\t0x%08x\n", chan_readl(chan, HSU_CH_D3TSR));
224
225 if (len > HSU_REGS_BUFSIZE)
226 len = HSU_REGS_BUFSIZE;
227
228 ret = simple_read_from_buffer(user_buf, count, ppos, buf, len);
229 kfree(buf);
230 return ret;
231 }
232
233 static const struct file_operations port_regs_ops = {
234 .owner = THIS_MODULE,
235 .open = hsu_show_regs_open,
236 .read = port_show_regs,
237 .llseek = default_llseek,
238 };
239
240 static const struct file_operations dma_regs_ops = {
241 .owner = THIS_MODULE,
242 .open = hsu_show_regs_open,
243 .read = dma_show_regs,
244 .llseek = default_llseek,
245 };
246
247 static int hsu_debugfs_init(struct hsu_port *hsu)
248 {
249 int i;
250 char name[32];
251
252 hsu->debugfs = debugfs_create_dir("hsu", NULL);
253 if (!hsu->debugfs)
254 return -ENOMEM;
255
256 for (i = 0; i < 3; i++) {
257 snprintf(name, sizeof(name), "port_%d_regs", i);
258 debugfs_create_file(name, S_IFREG | S_IRUGO,
259 hsu->debugfs, (void *)(&hsu->port[i]), &port_regs_ops);
260 }
261
262 for (i = 0; i < 6; i++) {
263 snprintf(name, sizeof(name), "dma_chan_%d_regs", i);
264 debugfs_create_file(name, S_IFREG | S_IRUGO,
265 hsu->debugfs, (void *)&hsu->chans[i], &dma_regs_ops);
266 }
267
268 return 0;
269 }
270
271 static void hsu_debugfs_remove(struct hsu_port *hsu)
272 {
273 if (hsu->debugfs)
274 debugfs_remove_recursive(hsu->debugfs);
275 }
276
277 #else
278 static inline int hsu_debugfs_init(struct hsu_port *hsu)
279 {
280 return 0;
281 }
282
283 static inline void hsu_debugfs_remove(struct hsu_port *hsu)
284 {
285 }
286 #endif /* CONFIG_DEBUG_FS */
287
288 static void serial_hsu_enable_ms(struct uart_port *port)
289 {
290 struct uart_hsu_port *up =
291 container_of(port, struct uart_hsu_port, port);
292
293 up->ier |= UART_IER_MSI;
294 serial_out(up, UART_IER, up->ier);
295 }
296
297 void hsu_dma_tx(struct uart_hsu_port *up)
298 {
299 struct circ_buf *xmit = &up->port.state->xmit;
300 struct hsu_dma_buffer *dbuf = &up->txbuf;
301 int count;
302
303 /* test_and_set_bit may be better, but anyway it's in lock protected mode */
304 if (up->dma_tx_on)
305 return;
306
307 /* Update the circ buf info */
308 xmit->tail += dbuf->ofs;
309 xmit->tail &= UART_XMIT_SIZE - 1;
310
311 up->port.icount.tx += dbuf->ofs;
312 dbuf->ofs = 0;
313
314 /* Disable the channel */
315 chan_writel(up->txc, HSU_CH_CR, 0x0);
316
317 if (!uart_circ_empty(xmit) && !uart_tx_stopped(&up->port)) {
318 dma_sync_single_for_device(up->port.dev,
319 dbuf->dma_addr,
320 dbuf->dma_size,
321 DMA_TO_DEVICE);
322
323 count = CIRC_CNT_TO_END(xmit->head, xmit->tail, UART_XMIT_SIZE);
324 dbuf->ofs = count;
325
326 /* Reprogram the channel */
327 chan_writel(up->txc, HSU_CH_D0SAR, dbuf->dma_addr + xmit->tail);
328 chan_writel(up->txc, HSU_CH_D0TSR, count);
329
330 /* Reenable the channel */
331 chan_writel(up->txc, HSU_CH_DCR, 0x1
332 | (0x1 << 8)
333 | (0x1 << 16)
334 | (0x1 << 24));
335 up->dma_tx_on = 1;
336 chan_writel(up->txc, HSU_CH_CR, 0x1);
337 }
338
339 if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS)
340 uart_write_wakeup(&up->port);
341 }
342
343 /* The buffer is already cache coherent */
344 void hsu_dma_start_rx_chan(struct hsu_dma_chan *rxc, struct hsu_dma_buffer *dbuf)
345 {
346 dbuf->ofs = 0;
347
348 chan_writel(rxc, HSU_CH_BSR, 32);
349 chan_writel(rxc, HSU_CH_MOTSR, 4);
350
351 chan_writel(rxc, HSU_CH_D0SAR, dbuf->dma_addr);
352 chan_writel(rxc, HSU_CH_D0TSR, dbuf->dma_size);
353 chan_writel(rxc, HSU_CH_DCR, 0x1 | (0x1 << 8)
354 | (0x1 << 16)
355 | (0x1 << 24) /* timeout bit, see HSU Errata 1 */
356 );
357 chan_writel(rxc, HSU_CH_CR, 0x3);
358
359 mod_timer(&rxc->rx_timer, jiffies + HSU_DMA_TIMEOUT_CHECK_FREQ);
360 }
361
362 /* Protected by spin_lock_irqsave(port->lock) */
363 static void serial_hsu_start_tx(struct uart_port *port)
364 {
365 struct uart_hsu_port *up =
366 container_of(port, struct uart_hsu_port, port);
367
368 if (up->use_dma) {
369 hsu_dma_tx(up);
370 } else if (!(up->ier & UART_IER_THRI)) {
371 up->ier |= UART_IER_THRI;
372 serial_out(up, UART_IER, up->ier);
373 }
374 }
375
376 static void serial_hsu_stop_tx(struct uart_port *port)
377 {
378 struct uart_hsu_port *up =
379 container_of(port, struct uart_hsu_port, port);
380 struct hsu_dma_chan *txc = up->txc;
381
382 if (up->use_dma)
383 chan_writel(txc, HSU_CH_CR, 0x0);
384 else if (up->ier & UART_IER_THRI) {
385 up->ier &= ~UART_IER_THRI;
386 serial_out(up, UART_IER, up->ier);
387 }
388 }
389
390 /* This is always called in spinlock protected mode, so
391 * modify timeout timer is safe here */
392 void hsu_dma_rx(struct uart_hsu_port *up, u32 int_sts)
393 {
394 struct hsu_dma_buffer *dbuf = &up->rxbuf;
395 struct hsu_dma_chan *chan = up->rxc;
396 struct uart_port *port = &up->port;
397 struct tty_struct *tty = port->state->port.tty;
398 int count;
399
400 if (!tty)
401 return;
402
403 /*
404 * First need to know how many is already transferred,
405 * then check if its a timeout DMA irq, and return
406 * the trail bytes out, push them up and reenable the
407 * channel
408 */
409
410 /* Timeout IRQ, need wait some time, see Errata 2 */
411 if (int_sts & 0xf00)
412 udelay(2);
413
414 /* Stop the channel */
415 chan_writel(chan, HSU_CH_CR, 0x0);
416
417 count = chan_readl(chan, HSU_CH_D0SAR) - dbuf->dma_addr;
418 if (!count) {
419 /* Restart the channel before we leave */
420 chan_writel(chan, HSU_CH_CR, 0x3);
421 return;
422 }
423 del_timer(&chan->rx_timer);
424
425 dma_sync_single_for_cpu(port->dev, dbuf->dma_addr,
426 dbuf->dma_size, DMA_FROM_DEVICE);
427
428 /*
429 * Head will only wrap around when we recycle
430 * the DMA buffer, and when that happens, we
431 * explicitly set tail to 0. So head will
432 * always be greater than tail.
433 */
434 tty_insert_flip_string(tty, dbuf->buf, count);
435 port->icount.rx += count;
436
437 dma_sync_single_for_device(up->port.dev, dbuf->dma_addr,
438 dbuf->dma_size, DMA_FROM_DEVICE);
439
440 /* Reprogram the channel */
441 chan_writel(chan, HSU_CH_D0SAR, dbuf->dma_addr);
442 chan_writel(chan, HSU_CH_D0TSR, dbuf->dma_size);
443 chan_writel(chan, HSU_CH_DCR, 0x1
444 | (0x1 << 8)
445 | (0x1 << 16)
446 | (0x1 << 24) /* timeout bit, see HSU Errata 1 */
447 );
448 tty_flip_buffer_push(tty);
449
450 chan_writel(chan, HSU_CH_CR, 0x3);
451 chan->rx_timer.expires = jiffies + HSU_DMA_TIMEOUT_CHECK_FREQ;
452 add_timer(&chan->rx_timer);
453
454 }
455
456 static void serial_hsu_stop_rx(struct uart_port *port)
457 {
458 struct uart_hsu_port *up =
459 container_of(port, struct uart_hsu_port, port);
460 struct hsu_dma_chan *chan = up->rxc;
461
462 if (up->use_dma)
463 chan_writel(chan, HSU_CH_CR, 0x2);
464 else {
465 up->ier &= ~UART_IER_RLSI;
466 up->port.read_status_mask &= ~UART_LSR_DR;
467 serial_out(up, UART_IER, up->ier);
468 }
469 }
470
471 static inline void receive_chars(struct uart_hsu_port *up, int *status)
472 {
473 struct tty_struct *tty = up->port.state->port.tty;
474 unsigned int ch, flag;
475 unsigned int max_count = 256;
476
477 if (!tty)
478 return;
479
480 do {
481 ch = serial_in(up, UART_RX);
482 flag = TTY_NORMAL;
483 up->port.icount.rx++;
484
485 if (unlikely(*status & (UART_LSR_BI | UART_LSR_PE |
486 UART_LSR_FE | UART_LSR_OE))) {
487
488 dev_warn(up->dev, "We really rush into ERR/BI case"
489 "status = 0x%02x", *status);
490 /* For statistics only */
491 if (*status & UART_LSR_BI) {
492 *status &= ~(UART_LSR_FE | UART_LSR_PE);
493 up->port.icount.brk++;
494 /*
495 * We do the SysRQ and SAK checking
496 * here because otherwise the break
497 * may get masked by ignore_status_mask
498 * or read_status_mask.
499 */
500 if (uart_handle_break(&up->port))
501 goto ignore_char;
502 } else if (*status & UART_LSR_PE)
503 up->port.icount.parity++;
504 else if (*status & UART_LSR_FE)
505 up->port.icount.frame++;
506 if (*status & UART_LSR_OE)
507 up->port.icount.overrun++;
508
509 /* Mask off conditions which should be ignored. */
510 *status &= up->port.read_status_mask;
511
512 #ifdef CONFIG_SERIAL_MFD_HSU_CONSOLE
513 if (up->port.cons &&
514 up->port.cons->index == up->port.line) {
515 /* Recover the break flag from console xmit */
516 *status |= up->lsr_break_flag;
517 up->lsr_break_flag = 0;
518 }
519 #endif
520 if (*status & UART_LSR_BI) {
521 flag = TTY_BREAK;
522 } else if (*status & UART_LSR_PE)
523 flag = TTY_PARITY;
524 else if (*status & UART_LSR_FE)
525 flag = TTY_FRAME;
526 }
527
528 if (uart_handle_sysrq_char(&up->port, ch))
529 goto ignore_char;
530
531 uart_insert_char(&up->port, *status, UART_LSR_OE, ch, flag);
532 ignore_char:
533 *status = serial_in(up, UART_LSR);
534 } while ((*status & UART_LSR_DR) && max_count--);
535 tty_flip_buffer_push(tty);
536 }
537
538 static void transmit_chars(struct uart_hsu_port *up)
539 {
540 struct circ_buf *xmit = &up->port.state->xmit;
541 int count;
542
543 if (up->port.x_char) {
544 serial_out(up, UART_TX, up->port.x_char);
545 up->port.icount.tx++;
546 up->port.x_char = 0;
547 return;
548 }
549 if (uart_circ_empty(xmit) || uart_tx_stopped(&up->port)) {
550 serial_hsu_stop_tx(&up->port);
551 return;
552 }
553
554 #ifndef MFD_HSU_A0_STEPPING
555 count = up->port.fifosize / 2;
556 #else
557 /*
558 * A0 only supports fully empty IRQ, and the first char written
559 * into it won't clear the EMPT bit, so we may need be cautious
560 * by useing a shorter buffer
561 */
562 count = up->port.fifosize - 4;
563 #endif
564 do {
565 serial_out(up, UART_TX, xmit->buf[xmit->tail]);
566 xmit->tail = (xmit->tail + 1) & (UART_XMIT_SIZE - 1);
567
568 up->port.icount.tx++;
569 if (uart_circ_empty(xmit))
570 break;
571 } while (--count > 0);
572
573 if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS)
574 uart_write_wakeup(&up->port);
575
576 if (uart_circ_empty(xmit))
577 serial_hsu_stop_tx(&up->port);
578 }
579
580 static inline void check_modem_status(struct uart_hsu_port *up)
581 {
582 int status;
583
584 status = serial_in(up, UART_MSR);
585
586 if ((status & UART_MSR_ANY_DELTA) == 0)
587 return;
588
589 if (status & UART_MSR_TERI)
590 up->port.icount.rng++;
591 if (status & UART_MSR_DDSR)
592 up->port.icount.dsr++;
593 /* We may only get DDCD when HW init and reset */
594 if (status & UART_MSR_DDCD)
595 uart_handle_dcd_change(&up->port, status & UART_MSR_DCD);
596 /* Will start/stop_tx accordingly */
597 if (status & UART_MSR_DCTS)
598 uart_handle_cts_change(&up->port, status & UART_MSR_CTS);
599
600 wake_up_interruptible(&up->port.state->port.delta_msr_wait);
601 }
602
603 /*
604 * This handles the interrupt from one port.
605 */
606 static irqreturn_t port_irq(int irq, void *dev_id)
607 {
608 struct uart_hsu_port *up = dev_id;
609 unsigned int iir, lsr;
610 unsigned long flags;
611
612 if (unlikely(!up->running))
613 return IRQ_NONE;
614
615 spin_lock_irqsave(&up->port.lock, flags);
616 if (up->use_dma) {
617 lsr = serial_in(up, UART_LSR);
618 if (unlikely(lsr & (UART_LSR_BI | UART_LSR_PE |
619 UART_LSR_FE | UART_LSR_OE)))
620 dev_warn(up->dev,
621 "Got lsr irq while using DMA, lsr = 0x%2x\n",
622 lsr);
623 check_modem_status(up);
624 spin_unlock_irqrestore(&up->port.lock, flags);
625 return IRQ_HANDLED;
626 }
627
628 iir = serial_in(up, UART_IIR);
629 if (iir & UART_IIR_NO_INT) {
630 spin_unlock_irqrestore(&up->port.lock, flags);
631 return IRQ_NONE;
632 }
633
634 lsr = serial_in(up, UART_LSR);
635 if (lsr & UART_LSR_DR)
636 receive_chars(up, &lsr);
637 check_modem_status(up);
638
639 /* lsr will be renewed during the receive_chars */
640 if (lsr & UART_LSR_THRE)
641 transmit_chars(up);
642
643 spin_unlock_irqrestore(&up->port.lock, flags);
644 return IRQ_HANDLED;
645 }
646
647 static inline void dma_chan_irq(struct hsu_dma_chan *chan)
648 {
649 struct uart_hsu_port *up = chan->uport;
650 unsigned long flags;
651 u32 int_sts;
652
653 spin_lock_irqsave(&up->port.lock, flags);
654
655 if (!up->use_dma || !up->running)
656 goto exit;
657
658 /*
659 * No matter what situation, need read clear the IRQ status
660 * There is a bug, see Errata 5, HSD 2900918
661 */
662 int_sts = chan_readl(chan, HSU_CH_SR);
663
664 /* Rx channel */
665 if (chan->dirt == DMA_FROM_DEVICE)
666 hsu_dma_rx(up, int_sts);
667
668 /* Tx channel */
669 if (chan->dirt == DMA_TO_DEVICE) {
670 chan_writel(chan, HSU_CH_CR, 0x0);
671 up->dma_tx_on = 0;
672 hsu_dma_tx(up);
673 }
674
675 exit:
676 spin_unlock_irqrestore(&up->port.lock, flags);
677 return;
678 }
679
680 static irqreturn_t dma_irq(int irq, void *dev_id)
681 {
682 struct hsu_port *hsu = dev_id;
683 u32 int_sts, i;
684
685 int_sts = mfd_readl(hsu, HSU_GBL_DMAISR);
686
687 /* Currently we only have 6 channels may be used */
688 for (i = 0; i < 6; i++) {
689 if (int_sts & 0x1)
690 dma_chan_irq(&hsu->chans[i]);
691 int_sts >>= 1;
692 }
693
694 return IRQ_HANDLED;
695 }
696
697 static unsigned int serial_hsu_tx_empty(struct uart_port *port)
698 {
699 struct uart_hsu_port *up =
700 container_of(port, struct uart_hsu_port, port);
701 unsigned long flags;
702 unsigned int ret;
703
704 spin_lock_irqsave(&up->port.lock, flags);
705 ret = serial_in(up, UART_LSR) & UART_LSR_TEMT ? TIOCSER_TEMT : 0;
706 spin_unlock_irqrestore(&up->port.lock, flags);
707
708 return ret;
709 }
710
711 static unsigned int serial_hsu_get_mctrl(struct uart_port *port)
712 {
713 struct uart_hsu_port *up =
714 container_of(port, struct uart_hsu_port, port);
715 unsigned char status;
716 unsigned int ret;
717
718 status = serial_in(up, UART_MSR);
719
720 ret = 0;
721 if (status & UART_MSR_DCD)
722 ret |= TIOCM_CAR;
723 if (status & UART_MSR_RI)
724 ret |= TIOCM_RNG;
725 if (status & UART_MSR_DSR)
726 ret |= TIOCM_DSR;
727 if (status & UART_MSR_CTS)
728 ret |= TIOCM_CTS;
729 return ret;
730 }
731
732 static void serial_hsu_set_mctrl(struct uart_port *port, unsigned int mctrl)
733 {
734 struct uart_hsu_port *up =
735 container_of(port, struct uart_hsu_port, port);
736 unsigned char mcr = 0;
737
738 if (mctrl & TIOCM_RTS)
739 mcr |= UART_MCR_RTS;
740 if (mctrl & TIOCM_DTR)
741 mcr |= UART_MCR_DTR;
742 if (mctrl & TIOCM_OUT1)
743 mcr |= UART_MCR_OUT1;
744 if (mctrl & TIOCM_OUT2)
745 mcr |= UART_MCR_OUT2;
746 if (mctrl & TIOCM_LOOP)
747 mcr |= UART_MCR_LOOP;
748
749 mcr |= up->mcr;
750
751 serial_out(up, UART_MCR, mcr);
752 }
753
754 static void serial_hsu_break_ctl(struct uart_port *port, int break_state)
755 {
756 struct uart_hsu_port *up =
757 container_of(port, struct uart_hsu_port, port);
758 unsigned long flags;
759
760 spin_lock_irqsave(&up->port.lock, flags);
761 if (break_state == -1)
762 up->lcr |= UART_LCR_SBC;
763 else
764 up->lcr &= ~UART_LCR_SBC;
765 serial_out(up, UART_LCR, up->lcr);
766 spin_unlock_irqrestore(&up->port.lock, flags);
767 }
768
769 /*
770 * What special to do:
771 * 1. chose the 64B fifo mode
772 * 2. make sure not to select half empty mode for A0 stepping
773 * 3. start dma or pio depends on configuration
774 * 4. we only allocate dma memory when needed
775 */
776 static int serial_hsu_startup(struct uart_port *port)
777 {
778 struct uart_hsu_port *up =
779 container_of(port, struct uart_hsu_port, port);
780 unsigned long flags;
781
782 /*
783 * Clear the FIFO buffers and disable them.
784 * (they will be reenabled in set_termios())
785 */
786 serial_out(up, UART_FCR, UART_FCR_ENABLE_FIFO);
787 serial_out(up, UART_FCR, UART_FCR_ENABLE_FIFO |
788 UART_FCR_CLEAR_RCVR | UART_FCR_CLEAR_XMIT);
789 serial_out(up, UART_FCR, 0);
790
791 /* Clear the interrupt registers. */
792 (void) serial_in(up, UART_LSR);
793 (void) serial_in(up, UART_RX);
794 (void) serial_in(up, UART_IIR);
795 (void) serial_in(up, UART_MSR);
796
797 /* Now, initialize the UART, default is 8n1 */
798 serial_out(up, UART_LCR, UART_LCR_WLEN8);
799
800 spin_lock_irqsave(&up->port.lock, flags);
801
802 up->port.mctrl |= TIOCM_OUT2;
803 serial_hsu_set_mctrl(&up->port, up->port.mctrl);
804
805 /*
806 * Finally, enable interrupts. Note: Modem status interrupts
807 * are set via set_termios(), which will be occurring imminently
808 * anyway, so we don't enable them here.
809 */
810 if (!up->use_dma)
811 up->ier = UART_IER_RLSI | UART_IER_RDI | UART_IER_RTOIE;
812 else
813 up->ier = 0;
814 serial_out(up, UART_IER, up->ier);
815
816 spin_unlock_irqrestore(&up->port.lock, flags);
817
818 /* DMA init */
819 if (up->use_dma) {
820 struct hsu_dma_buffer *dbuf;
821 struct circ_buf *xmit = &port->state->xmit;
822
823 up->dma_tx_on = 0;
824
825 /* First allocate the RX buffer */
826 dbuf = &up->rxbuf;
827 dbuf->buf = kzalloc(HSU_DMA_BUF_SIZE, GFP_KERNEL);
828 if (!dbuf->buf) {
829 up->use_dma = 0;
830 goto exit;
831 }
832 dbuf->dma_addr = dma_map_single(port->dev,
833 dbuf->buf,
834 HSU_DMA_BUF_SIZE,
835 DMA_FROM_DEVICE);
836 dbuf->dma_size = HSU_DMA_BUF_SIZE;
837
838 /* Start the RX channel right now */
839 hsu_dma_start_rx_chan(up->rxc, dbuf);
840
841 /* Next init the TX DMA */
842 dbuf = &up->txbuf;
843 dbuf->buf = xmit->buf;
844 dbuf->dma_addr = dma_map_single(port->dev,
845 dbuf->buf,
846 UART_XMIT_SIZE,
847 DMA_TO_DEVICE);
848 dbuf->dma_size = UART_XMIT_SIZE;
849
850 /* This should not be changed all around */
851 chan_writel(up->txc, HSU_CH_BSR, 32);
852 chan_writel(up->txc, HSU_CH_MOTSR, 4);
853 dbuf->ofs = 0;
854 }
855
856 exit:
857 /* And clear the interrupt registers again for luck. */
858 (void) serial_in(up, UART_LSR);
859 (void) serial_in(up, UART_RX);
860 (void) serial_in(up, UART_IIR);
861 (void) serial_in(up, UART_MSR);
862
863 up->running = 1;
864 return 0;
865 }
866
867 static void serial_hsu_shutdown(struct uart_port *port)
868 {
869 struct uart_hsu_port *up =
870 container_of(port, struct uart_hsu_port, port);
871 unsigned long flags;
872
873 del_timer_sync(&up->rxc->rx_timer);
874
875 /* Disable interrupts from this port */
876 up->ier = 0;
877 serial_out(up, UART_IER, 0);
878 up->running = 0;
879
880 spin_lock_irqsave(&up->port.lock, flags);
881 up->port.mctrl &= ~TIOCM_OUT2;
882 serial_hsu_set_mctrl(&up->port, up->port.mctrl);
883 spin_unlock_irqrestore(&up->port.lock, flags);
884
885 /* Disable break condition and FIFOs */
886 serial_out(up, UART_LCR, serial_in(up, UART_LCR) & ~UART_LCR_SBC);
887 serial_out(up, UART_FCR, UART_FCR_ENABLE_FIFO |
888 UART_FCR_CLEAR_RCVR |
889 UART_FCR_CLEAR_XMIT);
890 serial_out(up, UART_FCR, 0);
891 }
892
893 static void
894 serial_hsu_set_termios(struct uart_port *port, struct ktermios *termios,
895 struct ktermios *old)
896 {
897 struct uart_hsu_port *up =
898 container_of(port, struct uart_hsu_port, port);
899 struct tty_struct *tty = port->state->port.tty;
900 unsigned char cval, fcr = 0;
901 unsigned long flags;
902 unsigned int baud, quot;
903 u32 ps, mul;
904
905 switch (termios->c_cflag & CSIZE) {
906 case CS5:
907 cval = UART_LCR_WLEN5;
908 break;
909 case CS6:
910 cval = UART_LCR_WLEN6;
911 break;
912 case CS7:
913 cval = UART_LCR_WLEN7;
914 break;
915 default:
916 case CS8:
917 cval = UART_LCR_WLEN8;
918 break;
919 }
920
921 /* CMSPAR isn't supported by this driver */
922 if (tty)
923 tty->termios->c_cflag &= ~CMSPAR;
924
925 if (termios->c_cflag & CSTOPB)
926 cval |= UART_LCR_STOP;
927 if (termios->c_cflag & PARENB)
928 cval |= UART_LCR_PARITY;
929 if (!(termios->c_cflag & PARODD))
930 cval |= UART_LCR_EPAR;
931
932 /*
933 * The base clk is 50Mhz, and the baud rate come from:
934 * baud = 50M * MUL / (DIV * PS * DLAB)
935 *
936 * For those basic low baud rate we can get the direct
937 * scalar from 2746800, like 115200 = 2746800/24. For those
938 * higher baud rate, we handle them case by case, mainly by
939 * adjusting the MUL/PS registers, and DIV register is kept
940 * as default value 0x3d09 to make things simple
941 */
942 baud = uart_get_baud_rate(port, termios, old, 0, 4000000);
943
944 quot = 1;
945 ps = 0x10;
946 mul = 0x3600;
947 switch (baud) {
948 case 3500000:
949 mul = 0x3345;
950 ps = 0xC;
951 break;
952 case 1843200:
953 mul = 0x2400;
954 break;
955 case 3000000:
956 case 2500000:
957 case 2000000:
958 case 1500000:
959 case 1000000:
960 case 500000:
961 /* mul/ps/quot = 0x9C4/0x10/0x1 will make a 500000 bps */
962 mul = baud / 500000 * 0x9C4;
963 break;
964 default:
965 /* Use uart_get_divisor to get quot for other baud rates */
966 quot = 0;
967 }
968
969 if (!quot)
970 quot = uart_get_divisor(port, baud);
971
972 if ((up->port.uartclk / quot) < (2400 * 16))
973 fcr = UART_FCR_ENABLE_FIFO | UART_FCR_HSU_64_1B;
974 else if ((up->port.uartclk / quot) < (230400 * 16))
975 fcr = UART_FCR_ENABLE_FIFO | UART_FCR_HSU_64_16B;
976 else
977 fcr = UART_FCR_ENABLE_FIFO | UART_FCR_HSU_64_32B;
978
979 fcr |= UART_FCR_HSU_64B_FIFO;
980 #ifdef MFD_HSU_A0_STEPPING
981 /* A0 doesn't support half empty IRQ */
982 fcr |= UART_FCR_FULL_EMPT_TXI;
983 #endif
984
985 /*
986 * Ok, we're now changing the port state. Do it with
987 * interrupts disabled.
988 */
989 spin_lock_irqsave(&up->port.lock, flags);
990
991 /* Update the per-port timeout */
992 uart_update_timeout(port, termios->c_cflag, baud);
993
994 up->port.read_status_mask = UART_LSR_OE | UART_LSR_THRE | UART_LSR_DR;
995 if (termios->c_iflag & INPCK)
996 up->port.read_status_mask |= UART_LSR_FE | UART_LSR_PE;
997 if (termios->c_iflag & (BRKINT | PARMRK))
998 up->port.read_status_mask |= UART_LSR_BI;
999
1000 /* Characters to ignore */
1001 up->port.ignore_status_mask = 0;
1002 if (termios->c_iflag & IGNPAR)
1003 up->port.ignore_status_mask |= UART_LSR_PE | UART_LSR_FE;
1004 if (termios->c_iflag & IGNBRK) {
1005 up->port.ignore_status_mask |= UART_LSR_BI;
1006 /*
1007 * If we're ignoring parity and break indicators,
1008 * ignore overruns too (for real raw support).
1009 */
1010 if (termios->c_iflag & IGNPAR)
1011 up->port.ignore_status_mask |= UART_LSR_OE;
1012 }
1013
1014 /* Ignore all characters if CREAD is not set */
1015 if ((termios->c_cflag & CREAD) == 0)
1016 up->port.ignore_status_mask |= UART_LSR_DR;
1017
1018 /*
1019 * CTS flow control flag and modem status interrupts, disable
1020 * MSI by default
1021 */
1022 up->ier &= ~UART_IER_MSI;
1023 if (UART_ENABLE_MS(&up->port, termios->c_cflag))
1024 up->ier |= UART_IER_MSI;
1025
1026 serial_out(up, UART_IER, up->ier);
1027
1028 if (termios->c_cflag & CRTSCTS)
1029 up->mcr |= UART_MCR_AFE | UART_MCR_RTS;
1030 else
1031 up->mcr &= ~UART_MCR_AFE;
1032
1033 serial_out(up, UART_LCR, cval | UART_LCR_DLAB); /* set DLAB */
1034 serial_out(up, UART_DLL, quot & 0xff); /* LS of divisor */
1035 serial_out(up, UART_DLM, quot >> 8); /* MS of divisor */
1036 serial_out(up, UART_LCR, cval); /* reset DLAB */
1037 serial_out(up, UART_MUL, mul); /* set MUL */
1038 serial_out(up, UART_PS, ps); /* set PS */
1039 up->lcr = cval; /* Save LCR */
1040 serial_hsu_set_mctrl(&up->port, up->port.mctrl);
1041 serial_out(up, UART_FCR, fcr);
1042 spin_unlock_irqrestore(&up->port.lock, flags);
1043 }
1044
1045 static void
1046 serial_hsu_pm(struct uart_port *port, unsigned int state,
1047 unsigned int oldstate)
1048 {
1049 }
1050
1051 static void serial_hsu_release_port(struct uart_port *port)
1052 {
1053 }
1054
1055 static int serial_hsu_request_port(struct uart_port *port)
1056 {
1057 return 0;
1058 }
1059
1060 static void serial_hsu_config_port(struct uart_port *port, int flags)
1061 {
1062 struct uart_hsu_port *up =
1063 container_of(port, struct uart_hsu_port, port);
1064 up->port.type = PORT_MFD;
1065 }
1066
1067 static int
1068 serial_hsu_verify_port(struct uart_port *port, struct serial_struct *ser)
1069 {
1070 /* We don't want the core code to modify any port params */
1071 return -EINVAL;
1072 }
1073
1074 static const char *
1075 serial_hsu_type(struct uart_port *port)
1076 {
1077 struct uart_hsu_port *up =
1078 container_of(port, struct uart_hsu_port, port);
1079 return up->name;
1080 }
1081
1082 /* Mainly for uart console use */
1083 static struct uart_hsu_port *serial_hsu_ports[3];
1084 static struct uart_driver serial_hsu_reg;
1085
1086 #ifdef CONFIG_SERIAL_MFD_HSU_CONSOLE
1087
1088 #define BOTH_EMPTY (UART_LSR_TEMT | UART_LSR_THRE)
1089
1090 /* Wait for transmitter & holding register to empty */
1091 static inline void wait_for_xmitr(struct uart_hsu_port *up)
1092 {
1093 unsigned int status, tmout = 1000;
1094
1095 /* Wait up to 1ms for the character to be sent. */
1096 do {
1097 status = serial_in(up, UART_LSR);
1098
1099 if (status & UART_LSR_BI)
1100 up->lsr_break_flag = UART_LSR_BI;
1101
1102 if (--tmout == 0)
1103 break;
1104 udelay(1);
1105 } while (!(status & BOTH_EMPTY));
1106
1107 /* Wait up to 1s for flow control if necessary */
1108 if (up->port.flags & UPF_CONS_FLOW) {
1109 tmout = 1000000;
1110 while (--tmout &&
1111 ((serial_in(up, UART_MSR) & UART_MSR_CTS) == 0))
1112 udelay(1);
1113 }
1114 }
1115
1116 static void serial_hsu_console_putchar(struct uart_port *port, int ch)
1117 {
1118 struct uart_hsu_port *up =
1119 container_of(port, struct uart_hsu_port, port);
1120
1121 wait_for_xmitr(up);
1122 serial_out(up, UART_TX, ch);
1123 }
1124
1125 /*
1126 * Print a string to the serial port trying not to disturb
1127 * any possible real use of the port...
1128 *
1129 * The console_lock must be held when we get here.
1130 */
1131 static void
1132 serial_hsu_console_write(struct console *co, const char *s, unsigned int count)
1133 {
1134 struct uart_hsu_port *up = serial_hsu_ports[co->index];
1135 unsigned long flags;
1136 unsigned int ier;
1137 int locked = 1;
1138
1139 local_irq_save(flags);
1140 if (up->port.sysrq)
1141 locked = 0;
1142 else if (oops_in_progress) {
1143 locked = spin_trylock(&up->port.lock);
1144 } else
1145 spin_lock(&up->port.lock);
1146
1147 /* First save the IER then disable the interrupts */
1148 ier = serial_in(up, UART_IER);
1149 serial_out(up, UART_IER, 0);
1150
1151 uart_console_write(&up->port, s, count, serial_hsu_console_putchar);
1152
1153 /*
1154 * Finally, wait for transmitter to become empty
1155 * and restore the IER
1156 */
1157 wait_for_xmitr(up);
1158 serial_out(up, UART_IER, ier);
1159
1160 if (locked)
1161 spin_unlock(&up->port.lock);
1162 local_irq_restore(flags);
1163 }
1164
1165 static struct console serial_hsu_console;
1166
1167 static int __init
1168 serial_hsu_console_setup(struct console *co, char *options)
1169 {
1170 struct uart_hsu_port *up;
1171 int baud = 115200;
1172 int bits = 8;
1173 int parity = 'n';
1174 int flow = 'n';
1175 int ret;
1176
1177 if (co->index == -1 || co->index >= serial_hsu_reg.nr)
1178 co->index = 0;
1179 up = serial_hsu_ports[co->index];
1180 if (!up)
1181 return -ENODEV;
1182
1183 if (options)
1184 uart_parse_options(options, &baud, &parity, &bits, &flow);
1185
1186 ret = uart_set_options(&up->port, co, baud, parity, bits, flow);
1187
1188 return ret;
1189 }
1190
1191 static struct console serial_hsu_console = {
1192 .name = "ttyMFD",
1193 .write = serial_hsu_console_write,
1194 .device = uart_console_device,
1195 .setup = serial_hsu_console_setup,
1196 .flags = CON_PRINTBUFFER,
1197 .index = 2,
1198 .data = &serial_hsu_reg,
1199 };
1200 #endif
1201
1202 struct uart_ops serial_hsu_pops = {
1203 .tx_empty = serial_hsu_tx_empty,
1204 .set_mctrl = serial_hsu_set_mctrl,
1205 .get_mctrl = serial_hsu_get_mctrl,
1206 .stop_tx = serial_hsu_stop_tx,
1207 .start_tx = serial_hsu_start_tx,
1208 .stop_rx = serial_hsu_stop_rx,
1209 .enable_ms = serial_hsu_enable_ms,
1210 .break_ctl = serial_hsu_break_ctl,
1211 .startup = serial_hsu_startup,
1212 .shutdown = serial_hsu_shutdown,
1213 .set_termios = serial_hsu_set_termios,
1214 .pm = serial_hsu_pm,
1215 .type = serial_hsu_type,
1216 .release_port = serial_hsu_release_port,
1217 .request_port = serial_hsu_request_port,
1218 .config_port = serial_hsu_config_port,
1219 .verify_port = serial_hsu_verify_port,
1220 };
1221
1222 static struct uart_driver serial_hsu_reg = {
1223 .owner = THIS_MODULE,
1224 .driver_name = "MFD serial",
1225 .dev_name = "ttyMFD",
1226 .major = TTY_MAJOR,
1227 .minor = 128,
1228 .nr = 3,
1229 };
1230
1231 #ifdef CONFIG_PM
1232 static int serial_hsu_suspend(struct pci_dev *pdev, pm_message_t state)
1233 {
1234 void *priv = pci_get_drvdata(pdev);
1235 struct uart_hsu_port *up;
1236
1237 /* Make sure this is not the internal dma controller */
1238 if (priv && (pdev->device != 0x081E)) {
1239 up = priv;
1240 uart_suspend_port(&serial_hsu_reg, &up->port);
1241 }
1242
1243 pci_save_state(pdev);
1244 pci_set_power_state(pdev, pci_choose_state(pdev, state));
1245 return 0;
1246 }
1247
1248 static int serial_hsu_resume(struct pci_dev *pdev)
1249 {
1250 void *priv = pci_get_drvdata(pdev);
1251 struct uart_hsu_port *up;
1252 int ret;
1253
1254 pci_set_power_state(pdev, PCI_D0);
1255 pci_restore_state(pdev);
1256
1257 ret = pci_enable_device(pdev);
1258 if (ret)
1259 dev_warn(&pdev->dev,
1260 "HSU: can't re-enable device, try to continue\n");
1261
1262 if (priv && (pdev->device != 0x081E)) {
1263 up = priv;
1264 uart_resume_port(&serial_hsu_reg, &up->port);
1265 }
1266 return 0;
1267 }
1268 #else
1269 #define serial_hsu_suspend NULL
1270 #define serial_hsu_resume NULL
1271 #endif
1272
1273 /* temp global pointer before we settle down on using one or four PCI dev */
1274 static struct hsu_port *phsu;
1275
1276 static int serial_hsu_probe(struct pci_dev *pdev,
1277 const struct pci_device_id *ent)
1278 {
1279 struct uart_hsu_port *uport;
1280 int index, ret;
1281
1282 printk(KERN_INFO "HSU: found PCI Serial controller(ID: %04x:%04x)\n",
1283 pdev->vendor, pdev->device);
1284
1285 switch (pdev->device) {
1286 case 0x081B:
1287 index = 0;
1288 break;
1289 case 0x081C:
1290 index = 1;
1291 break;
1292 case 0x081D:
1293 index = 2;
1294 break;
1295 case 0x081E:
1296 /* internal DMA controller */
1297 index = 3;
1298 break;
1299 default:
1300 dev_err(&pdev->dev, "HSU: out of index!");
1301 return -ENODEV;
1302 }
1303
1304 ret = pci_enable_device(pdev);
1305 if (ret)
1306 return ret;
1307
1308 if (index == 3) {
1309 /* DMA controller */
1310 ret = request_irq(pdev->irq, dma_irq, 0, "hsu_dma", phsu);
1311 if (ret) {
1312 dev_err(&pdev->dev, "can not get IRQ\n");
1313 goto err_disable;
1314 }
1315 pci_set_drvdata(pdev, phsu);
1316 } else {
1317 /* UART port 0~2 */
1318 uport = &phsu->port[index];
1319 uport->port.irq = pdev->irq;
1320 uport->port.dev = &pdev->dev;
1321 uport->dev = &pdev->dev;
1322
1323 ret = request_irq(pdev->irq, port_irq, 0, uport->name, uport);
1324 if (ret) {
1325 dev_err(&pdev->dev, "can not get IRQ\n");
1326 goto err_disable;
1327 }
1328 uart_add_one_port(&serial_hsu_reg, &uport->port);
1329
1330 #ifdef CONFIG_SERIAL_MFD_HSU_CONSOLE
1331 if (index == 2) {
1332 register_console(&serial_hsu_console);
1333 uport->port.cons = &serial_hsu_console;
1334 }
1335 #endif
1336 pci_set_drvdata(pdev, uport);
1337 }
1338
1339 return 0;
1340
1341 err_disable:
1342 pci_disable_device(pdev);
1343 return ret;
1344 }
1345
1346 static void hsu_dma_rx_timeout(unsigned long data)
1347 {
1348 struct hsu_dma_chan *chan = (void *)data;
1349 struct uart_hsu_port *up = chan->uport;
1350 struct hsu_dma_buffer *dbuf = &up->rxbuf;
1351 int count = 0;
1352 unsigned long flags;
1353
1354 spin_lock_irqsave(&up->port.lock, flags);
1355
1356 count = chan_readl(chan, HSU_CH_D0SAR) - dbuf->dma_addr;
1357
1358 if (!count) {
1359 mod_timer(&chan->rx_timer, jiffies + HSU_DMA_TIMEOUT_CHECK_FREQ);
1360 goto exit;
1361 }
1362
1363 hsu_dma_rx(up, 0);
1364 exit:
1365 spin_unlock_irqrestore(&up->port.lock, flags);
1366 }
1367
1368 static void hsu_global_init(void)
1369 {
1370 struct hsu_port *hsu;
1371 struct uart_hsu_port *uport;
1372 struct hsu_dma_chan *dchan;
1373 int i, ret;
1374
1375 hsu = kzalloc(sizeof(struct hsu_port), GFP_KERNEL);
1376 if (!hsu)
1377 return;
1378
1379 /* Get basic io resource and map it */
1380 hsu->paddr = 0xffa28000;
1381 hsu->iolen = 0x1000;
1382
1383 if (!(request_mem_region(hsu->paddr, hsu->iolen, "HSU global")))
1384 pr_warning("HSU: error in request mem region\n");
1385
1386 hsu->reg = ioremap_nocache((unsigned long)hsu->paddr, hsu->iolen);
1387 if (!hsu->reg) {
1388 pr_err("HSU: error in ioremap\n");
1389 ret = -ENOMEM;
1390 goto err_free_region;
1391 }
1392
1393 /* Initialise the 3 UART ports */
1394 uport = hsu->port;
1395 for (i = 0; i < 3; i++) {
1396 uport->port.type = PORT_MFD;
1397 uport->port.iotype = UPIO_MEM;
1398 uport->port.mapbase = (resource_size_t)hsu->paddr
1399 + HSU_PORT_REG_OFFSET
1400 + i * HSU_PORT_REG_LENGTH;
1401 uport->port.membase = hsu->reg + HSU_PORT_REG_OFFSET
1402 + i * HSU_PORT_REG_LENGTH;
1403
1404 sprintf(uport->name, "hsu_port%d", i);
1405 uport->port.fifosize = 64;
1406 uport->port.ops = &serial_hsu_pops;
1407 uport->port.line = i;
1408 uport->port.flags = UPF_IOREMAP;
1409 /* set the scalable maxim support rate to 2746800 bps */
1410 uport->port.uartclk = 115200 * 24 * 16;
1411
1412 uport->running = 0;
1413 uport->txc = &hsu->chans[i * 2];
1414 uport->rxc = &hsu->chans[i * 2 + 1];
1415
1416 serial_hsu_ports[i] = uport;
1417 uport->index = i;
1418 uport++;
1419 }
1420
1421 /* Initialise 6 dma channels */
1422 dchan = hsu->chans;
1423 for (i = 0; i < 6; i++) {
1424 dchan->id = i;
1425 dchan->dirt = (i & 0x1) ? DMA_FROM_DEVICE : DMA_TO_DEVICE;
1426 dchan->uport = &hsu->port[i/2];
1427 dchan->reg = hsu->reg + HSU_DMA_CHANS_REG_OFFSET +
1428 i * HSU_DMA_CHANS_REG_LENGTH;
1429
1430 /* Work around for RX */
1431 if (dchan->dirt == DMA_FROM_DEVICE) {
1432 init_timer(&dchan->rx_timer);
1433 dchan->rx_timer.function = hsu_dma_rx_timeout;
1434 dchan->rx_timer.data = (unsigned long)dchan;
1435 }
1436 dchan++;
1437 }
1438
1439 phsu = hsu;
1440 hsu_debugfs_init(hsu);
1441 return;
1442
1443 err_free_region:
1444 release_mem_region(hsu->paddr, hsu->iolen);
1445 kfree(hsu);
1446 return;
1447 }
1448
1449 static void serial_hsu_remove(struct pci_dev *pdev)
1450 {
1451 void *priv = pci_get_drvdata(pdev);
1452 struct uart_hsu_port *up;
1453
1454 if (!priv)
1455 return;
1456
1457 /* For port 0/1/2, priv is the address of uart_hsu_port */
1458 if (pdev->device != 0x081E) {
1459 up = priv;
1460 uart_remove_one_port(&serial_hsu_reg, &up->port);
1461 }
1462
1463 pci_set_drvdata(pdev, NULL);
1464 free_irq(pdev->irq, priv);
1465 pci_disable_device(pdev);
1466 }
1467
1468 /* First 3 are UART ports, and the 4th is the DMA */
1469 static const struct pci_device_id pci_ids[] __devinitdata = {
1470 { PCI_DEVICE(PCI_VENDOR_ID_INTEL, 0x081B) },
1471 { PCI_DEVICE(PCI_VENDOR_ID_INTEL, 0x081C) },
1472 { PCI_DEVICE(PCI_VENDOR_ID_INTEL, 0x081D) },
1473 { PCI_DEVICE(PCI_VENDOR_ID_INTEL, 0x081E) },
1474 {},
1475 };
1476
1477 static struct pci_driver hsu_pci_driver = {
1478 .name = "HSU serial",
1479 .id_table = pci_ids,
1480 .probe = serial_hsu_probe,
1481 .remove = __devexit_p(serial_hsu_remove),
1482 .suspend = serial_hsu_suspend,
1483 .resume = serial_hsu_resume,
1484 };
1485
1486 static int __init hsu_pci_init(void)
1487 {
1488 int ret;
1489
1490 hsu_global_init();
1491
1492 ret = uart_register_driver(&serial_hsu_reg);
1493 if (ret)
1494 return ret;
1495
1496 return pci_register_driver(&hsu_pci_driver);
1497 }
1498
1499 static void __exit hsu_pci_exit(void)
1500 {
1501 pci_unregister_driver(&hsu_pci_driver);
1502 uart_unregister_driver(&serial_hsu_reg);
1503
1504 hsu_debugfs_remove(phsu);
1505
1506 kfree(phsu);
1507 }
1508
1509 module_init(hsu_pci_init);
1510 module_exit(hsu_pci_exit);
1511
1512 MODULE_LICENSE("GPL v2");
1513 MODULE_ALIAS("platform:medfield-hsu");
Linux with added FPC-III support