]> git.proxmox.com Git - mirror_ubuntu-zesty-kernel.git/blame - drivers/tty/serial/mfd.c
projects / mirror_ubuntu-zesty-kernel.git / blame
? search:
summary | shortlog | log | commit | commitdiff | tree
blob | blame (incremental) | history | HEAD
hsu: add runtime pm support
[mirror_ubuntu-zesty-kernel.git] / drivers / tty / serial / mfd.c
CommitLineData
d843fc6e
FT		 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 *
06c77e21 6 * (C) Copyright 2010 Intel Corporation
d843fc6e
FT		 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
d843fc6e 14/* Notes:
06c77e21
FT		 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
d843fc6e 18 *
085a4f75 19 * 2. The RI/DSR/DCD/DTR are not pinned out, DCD & DSR are always
06c77e21
FT		 20 * asserted, only when the HW is reset the DDCD and DDSR will
21 * be triggered
d843fc6e
FT		 22 */
23
24#include <linux/module.h>
25#include <linux/init.h>
26#include <linux/console.h>
27#include <linux/sysrq.h>
63d66cab 28#include <linux/slab.h>
d843fc6e
FT		 29#include <linux/serial_reg.h>
30#include <linux/circ_buf.h>
31#include <linux/delay.h>
32#include <linux/interrupt.h>
33#include <linux/tty.h>
34#include <linux/tty_flip.h>
35#include <linux/serial_core.h>
36#include <linux/serial_mfd.h>
37#include <linux/dma-mapping.h>
38#include <linux/pci.h>
39#include <linux/io.h>
40#include <linux/debugfs.h>
88e5173f 41#include <linux/pm_runtime.h>
d843fc6e 42
d843fc6e
FT		 43#define HSU_DMA_BUF_SIZE 2048
44
45#define chan_readl(chan, offset) readl(chan->reg + offset)
46#define chan_writel(chan, offset, val) writel(val, chan->reg + offset)
47
48#define mfd_readl(obj, offset) readl(obj->reg + offset)
49#define mfd_writel(obj, offset, val) writel(val, obj->reg + offset)
50
f023eab3
FT		 51static int hsu_dma_enable;
52module_param(hsu_dma_enable, int, 0);
85ee7a1d
JP		 53MODULE_PARM_DESC(hsu_dma_enable,
54 "It is a bitmap to set working mode, if bit[x] is 1, then port[x] will work in DMA mode, otherwise in PIO mode.");
f023eab3 55
d843fc6e
FT		 56struct hsu_dma_buffer {
57 u8 *buf;
58 dma_addr_t dma_addr;
59 u32 dma_size;
60 u32 ofs;
61};
62
63struct hsu_dma_chan {
64 u32 id;
06c77e21 65 enum dma_data_direction dirt;
d843fc6e 66 struct uart_hsu_port *uport;
669b7a09 67 void __iomem *reg;
d843fc6e
FT		 68};
69
70struct uart_hsu_port {
71 struct uart_port port;
72 unsigned char ier;
73 unsigned char lcr;
74 unsigned char mcr;
75 unsigned int lsr_break_flag;
76 char name[12];
77 int index;
78 struct device *dev;
79
80 struct hsu_dma_chan *txc;
81 struct hsu_dma_chan *rxc;
82 struct hsu_dma_buffer txbuf;
83 struct hsu_dma_buffer rxbuf;
84 int use_dma; /* flag for DMA/PIO */
85 int running;
86 int dma_tx_on;
87};
88
89/* Top level data structure of HSU */
90struct hsu_port {
d843fc6e
FT		 91 void __iomem *reg;
92 unsigned long paddr;
93 unsigned long iolen;
94 u32 irq;
95
96 struct uart_hsu_port port[3];
97 struct hsu_dma_chan chans[10];
98
d843fc6e 99 struct dentry *debugfs;
d843fc6e
FT		 100};
101
d843fc6e
FT		 102static inline unsigned int serial_in(struct uart_hsu_port *up, int offset)
103{
104 unsigned int val;
105
106 if (offset > UART_MSR) {
107 offset <<= 2;
108 val = readl(up->port.membase + offset);
109 } else
110 val = (unsigned int)readb(up->port.membase + offset);
111
112 return val;
113}
114
115static inline void serial_out(struct uart_hsu_port *up, int offset, int value)
116{
117 if (offset > UART_MSR) {
118 offset <<= 2;
119 writel(value, up->port.membase + offset);
120 } else {
121 unsigned char val = value & 0xff;
122 writeb(val, up->port.membase + offset);
123 }
124}
125
126#ifdef CONFIG_DEBUG_FS
127
128#define HSU_REGS_BUFSIZE 1024
129
130static int hsu_show_regs_open(struct inode *inode, struct file *file)
131{
132 file->private_data = inode->i_private;
133 return 0;
134}
135
136static ssize_t port_show_regs(struct file *file, char __user *user_buf,
137 size_t count, loff_t *ppos)
138{
139 struct uart_hsu_port *up = file->private_data;
140 char *buf;
141 u32 len = 0;
142 ssize_t ret;
143
144 buf = kzalloc(HSU_REGS_BUFSIZE, GFP_KERNEL);
145 if (!buf)
146 return 0;
147
148 len += snprintf(buf + len, HSU_REGS_BUFSIZE - len,
149 "MFD HSU port[%d] regs:\n", up->index);
150
151 len += snprintf(buf + len, HSU_REGS_BUFSIZE - len,
152 "=================================\n");
153 len += snprintf(buf + len, HSU_REGS_BUFSIZE - len,
154 "IER: \t\t0x%08x\n", serial_in(up, UART_IER));
155 len += snprintf(buf + len, HSU_REGS_BUFSIZE - len,
156 "IIR: \t\t0x%08x\n", serial_in(up, UART_IIR));
157 len += snprintf(buf + len, HSU_REGS_BUFSIZE - len,
158 "LCR: \t\t0x%08x\n", serial_in(up, UART_LCR));
159 len += snprintf(buf + len, HSU_REGS_BUFSIZE - len,
160 "MCR: \t\t0x%08x\n", serial_in(up, UART_MCR));
161 len += snprintf(buf + len, HSU_REGS_BUFSIZE - len,
162 "LSR: \t\t0x%08x\n", serial_in(up, UART_LSR));
163 len += snprintf(buf + len, HSU_REGS_BUFSIZE - len,
164 "MSR: \t\t0x%08x\n", serial_in(up, UART_MSR));
165 len += snprintf(buf + len, HSU_REGS_BUFSIZE - len,
166 "FOR: \t\t0x%08x\n", serial_in(up, UART_FOR));
167 len += snprintf(buf + len, HSU_REGS_BUFSIZE - len,
168 "PS: \t\t0x%08x\n", serial_in(up, UART_PS));
169 len += snprintf(buf + len, HSU_REGS_BUFSIZE - len,
170 "MUL: \t\t0x%08x\n", serial_in(up, UART_MUL));
171 len += snprintf(buf + len, HSU_REGS_BUFSIZE - len,
172 "DIV: \t\t0x%08x\n", serial_in(up, UART_DIV));
173
a9589811
DC		 174 if (len > HSU_REGS_BUFSIZE)
175 len = HSU_REGS_BUFSIZE;
176
d843fc6e
FT		 177 ret = simple_read_from_buffer(user_buf, count, ppos, buf, len);
178 kfree(buf);
179 return ret;
180}
181
182static ssize_t dma_show_regs(struct file *file, char __user *user_buf,
183 size_t count, loff_t *ppos)
184{
185 struct hsu_dma_chan *chan = file->private_data;
186 char *buf;
187 u32 len = 0;
188 ssize_t ret;
189
190 buf = kzalloc(HSU_REGS_BUFSIZE, GFP_KERNEL);
191 if (!buf)
192 return 0;
193
194 len += snprintf(buf + len, HSU_REGS_BUFSIZE - len,
195 "MFD HSU DMA channel [%d] regs:\n", chan->id);
196
197 len += snprintf(buf + len, HSU_REGS_BUFSIZE - len,
198 "=================================\n");
199 len += snprintf(buf + len, HSU_REGS_BUFSIZE - len,
200 "CR: \t\t0x%08x\n", chan_readl(chan, HSU_CH_CR));
201 len += snprintf(buf + len, HSU_REGS_BUFSIZE - len,
202 "DCR: \t\t0x%08x\n", chan_readl(chan, HSU_CH_DCR));
203 len += snprintf(buf + len, HSU_REGS_BUFSIZE - len,
204 "BSR: \t\t0x%08x\n", chan_readl(chan, HSU_CH_BSR));
205 len += snprintf(buf + len, HSU_REGS_BUFSIZE - len,
206 "MOTSR: \t\t0x%08x\n", chan_readl(chan, HSU_CH_MOTSR));
207 len += snprintf(buf + len, HSU_REGS_BUFSIZE - len,
208 "D0SAR: \t\t0x%08x\n", chan_readl(chan, HSU_CH_D0SAR));
209 len += snprintf(buf + len, HSU_REGS_BUFSIZE - len,
210 "D0TSR: \t\t0x%08x\n", chan_readl(chan, HSU_CH_D0TSR));
211 len += snprintf(buf + len, HSU_REGS_BUFSIZE - len,
212 "D0SAR: \t\t0x%08x\n", chan_readl(chan, HSU_CH_D1SAR));
213 len += snprintf(buf + len, HSU_REGS_BUFSIZE - len,
214 "D0TSR: \t\t0x%08x\n", chan_readl(chan, HSU_CH_D1TSR));
215 len += snprintf(buf + len, HSU_REGS_BUFSIZE - len,
216 "D0SAR: \t\t0x%08x\n", chan_readl(chan, HSU_CH_D2SAR));
217 len += snprintf(buf + len, HSU_REGS_BUFSIZE - len,
218 "D0TSR: \t\t0x%08x\n", chan_readl(chan, HSU_CH_D2TSR));
219 len += snprintf(buf + len, HSU_REGS_BUFSIZE - len,
220 "D0SAR: \t\t0x%08x\n", chan_readl(chan, HSU_CH_D3SAR));
221 len += snprintf(buf + len, HSU_REGS_BUFSIZE - len,
222 "D0TSR: \t\t0x%08x\n", chan_readl(chan, HSU_CH_D3TSR));
223
a9589811
DC		 224 if (len > HSU_REGS_BUFSIZE)
225 len = HSU_REGS_BUFSIZE;
226
d843fc6e
FT		 227 ret = simple_read_from_buffer(user_buf, count, ppos, buf, len);
228 kfree(buf);
229 return ret;
230}
231
232static const struct file_operations port_regs_ops = {
233 .owner = THIS_MODULE,
234 .open = hsu_show_regs_open,
235 .read = port_show_regs,
6038f373 236 .llseek = default_llseek,
d843fc6e
FT		 237};
238
239static const struct file_operations dma_regs_ops = {
240 .owner = THIS_MODULE,
241 .open = hsu_show_regs_open,
242 .read = dma_show_regs,
6038f373 243 .llseek = default_llseek,
d843fc6e
FT		 244};
245
246static int hsu_debugfs_init(struct hsu_port *hsu)
247{
248 int i;
249 char name[32];
250
251 hsu->debugfs = debugfs_create_dir("hsu", NULL);
252 if (!hsu->debugfs)
253 return -ENOMEM;
254
255 for (i = 0; i < 3; i++) {
256 snprintf(name, sizeof(name), "port_%d_regs", i);
257 debugfs_create_file(name, S_IFREG | S_IRUGO,
258 hsu->debugfs, (void *)(&hsu->port[i]), &port_regs_ops);
259 }
260
261 for (i = 0; i < 6; i++) {
262 snprintf(name, sizeof(name), "dma_chan_%d_regs", i);
263 debugfs_create_file(name, S_IFREG | S_IRUGO,
264 hsu->debugfs, (void *)&hsu->chans[i], &dma_regs_ops);
265 }
266
267 return 0;
268}
269
270static void hsu_debugfs_remove(struct hsu_port *hsu)
271{
272 if (hsu->debugfs)
273 debugfs_remove_recursive(hsu->debugfs);
274}
275
276#else
277static inline int hsu_debugfs_init(struct hsu_port *hsu)
278{
279 return 0;
280}
281
282static inline void hsu_debugfs_remove(struct hsu_port *hsu)
283{
284}
285#endif /* CONFIG_DEBUG_FS */
286
287static void serial_hsu_enable_ms(struct uart_port *port)
288{
289 struct uart_hsu_port *up =
290 container_of(port, struct uart_hsu_port, port);
291
292 up->ier |= UART_IER_MSI;
293 serial_out(up, UART_IER, up->ier);
294}
295
296void hsu_dma_tx(struct uart_hsu_port *up)
297{
298 struct circ_buf *xmit = &up->port.state->xmit;
299 struct hsu_dma_buffer *dbuf = &up->txbuf;
300 int count;
301
302 /* test_and_set_bit may be better, but anyway it's in lock protected mode */
303 if (up->dma_tx_on)
304 return;
305
306 /* Update the circ buf info */
307 xmit->tail += dbuf->ofs;
308 xmit->tail &= UART_XMIT_SIZE - 1;
309
310 up->port.icount.tx += dbuf->ofs;
311 dbuf->ofs = 0;
312
313 /* Disable the channel */
314 chan_writel(up->txc, HSU_CH_CR, 0x0);
315
316 if (!uart_circ_empty(xmit) && !uart_tx_stopped(&up->port)) {
317 dma_sync_single_for_device(up->port.dev,
318 dbuf->dma_addr,
319 dbuf->dma_size,
320 DMA_TO_DEVICE);
321
322 count = CIRC_CNT_TO_END(xmit->head, xmit->tail, UART_XMIT_SIZE);
323 dbuf->ofs = count;
324
325 /* Reprogram the channel */
326 chan_writel(up->txc, HSU_CH_D0SAR, dbuf->dma_addr + xmit->tail);
327 chan_writel(up->txc, HSU_CH_D0TSR, count);
328
329 /* Reenable the channel */
330 chan_writel(up->txc, HSU_CH_DCR, 0x1
331 | (0x1 << 8)
332 | (0x1 << 16)
333 | (0x1 << 24));
d843fc6e
FT		 334 up->dma_tx_on = 1;
335 chan_writel(up->txc, HSU_CH_CR, 0x1);
336 }
337
338 if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS)
339 uart_write_wakeup(&up->port);
340}
341
342/* The buffer is already cache coherent */
343void hsu_dma_start_rx_chan(struct hsu_dma_chan *rxc, struct hsu_dma_buffer *dbuf)
344{
d843fc6e
FT		 345 dbuf->ofs = 0;
346
347 chan_writel(rxc, HSU_CH_BSR, 32);
348 chan_writel(rxc, HSU_CH_MOTSR, 4);
349
350 chan_writel(rxc, HSU_CH_D0SAR, dbuf->dma_addr);
351 chan_writel(rxc, HSU_CH_D0TSR, dbuf->dma_size);
352 chan_writel(rxc, HSU_CH_DCR, 0x1 | (0x1 << 8)
353 | (0x1 << 16)
354 | (0x1 << 24) /* timeout bit, see HSU Errata 1 */
355 );
356 chan_writel(rxc, HSU_CH_CR, 0x3);
357}
358
359/* Protected by spin_lock_irqsave(port->lock) */
360static void serial_hsu_start_tx(struct uart_port *port)
361{
362 struct uart_hsu_port *up =
363 container_of(port, struct uart_hsu_port, port);
364
365 if (up->use_dma) {
366 hsu_dma_tx(up);
367 } else if (!(up->ier & UART_IER_THRI)) {
368 up->ier |= UART_IER_THRI;
369 serial_out(up, UART_IER, up->ier);
370 }
371}
372
373static void serial_hsu_stop_tx(struct uart_port *port)
374{
375 struct uart_hsu_port *up =
376 container_of(port, struct uart_hsu_port, port);
377 struct hsu_dma_chan *txc = up->txc;
378
379 if (up->use_dma)
380 chan_writel(txc, HSU_CH_CR, 0x0);
381 else if (up->ier & UART_IER_THRI) {
382 up->ier &= ~UART_IER_THRI;
383 serial_out(up, UART_IER, up->ier);
384 }
385}
386
387/* This is always called in spinlock protected mode, so
388 * modify timeout timer is safe here */
389void hsu_dma_rx(struct uart_hsu_port *up, u32 int_sts)
390{
391 struct hsu_dma_buffer *dbuf = &up->rxbuf;
392 struct hsu_dma_chan *chan = up->rxc;
393 struct uart_port *port = &up->port;
394 struct tty_struct *tty = port->state->port.tty;
395 int count;
396
397 if (!tty)
398 return;
399
400 /*
06c77e21 401 * First need to know how many is already transferred,
d843fc6e
FT		 402 * then check if its a timeout DMA irq, and return
403 * the trail bytes out, push them up and reenable the
06c77e21 404 * channel
d843fc6e
FT		 405 */
406
06c77e21 407 /* Timeout IRQ, need wait some time, see Errata 2 */
d843fc6e
FT		 408 if (int_sts & 0xf00)
409 udelay(2);
410
411 /* Stop the channel */
412 chan_writel(chan, HSU_CH_CR, 0x0);
413
d843fc6e 414 count = chan_readl(chan, HSU_CH_D0SAR) - dbuf->dma_addr;
669b7a09 415 if (!count) {
06c77e21 416 /* Restart the channel before we leave */
669b7a09 417 chan_writel(chan, HSU_CH_CR, 0x3);
d843fc6e 418 return;
669b7a09 419 }
d843fc6e
FT		 420
421 dma_sync_single_for_cpu(port->dev, dbuf->dma_addr,
422 dbuf->dma_size, DMA_FROM_DEVICE);
423
424 /*
06c77e21 425 * Head will only wrap around when we recycle
d843fc6e
FT		 426 * the DMA buffer, and when that happens, we
427 * explicitly set tail to 0. So head will
428 * always be greater than tail.
429 */
430 tty_insert_flip_string(tty, dbuf->buf, count);
431 port->icount.rx += count;
432
433 dma_sync_single_for_device(up->port.dev, dbuf->dma_addr,
434 dbuf->dma_size, DMA_FROM_DEVICE);
435
436 /* Reprogram the channel */
437 chan_writel(chan, HSU_CH_D0SAR, dbuf->dma_addr);
438 chan_writel(chan, HSU_CH_D0TSR, dbuf->dma_size);
439 chan_writel(chan, HSU_CH_DCR, 0x1
440 | (0x1 << 8)
441 | (0x1 << 16)
442 | (0x1 << 24) /* timeout bit, see HSU Errata 1 */
443 );
669b7a09
FT		 444 tty_flip_buffer_push(tty);
445
d843fc6e
FT		 446 chan_writel(chan, HSU_CH_CR, 0x3);
447
d843fc6e
FT		 448}
449
450static void serial_hsu_stop_rx(struct uart_port *port)
451{
452 struct uart_hsu_port *up =
453 container_of(port, struct uart_hsu_port, port);
454 struct hsu_dma_chan *chan = up->rxc;
455
456 if (up->use_dma)
457 chan_writel(chan, HSU_CH_CR, 0x2);
458 else {
459 up->ier &= ~UART_IER_RLSI;
460 up->port.read_status_mask &= ~UART_LSR_DR;
461 serial_out(up, UART_IER, up->ier);
462 }
463}
464
d843fc6e
FT		 465static inline void receive_chars(struct uart_hsu_port *up, int *status)
466{
467 struct tty_struct *tty = up->port.state->port.tty;
468 unsigned int ch, flag;
469 unsigned int max_count = 256;
470
471 if (!tty)
472 return;
473
474 do {
475 ch = serial_in(up, UART_RX);
476 flag = TTY_NORMAL;
477 up->port.icount.rx++;
478
479 if (unlikely(*status & (UART_LSR_BI | UART_LSR_PE |
480 UART_LSR_FE | UART_LSR_OE))) {
481
482 dev_warn(up->dev, "We really rush into ERR/BI case"
483 "status = 0x%02x", *status);
484 /* For statistics only */
485 if (*status & UART_LSR_BI) {
486 *status &= ~(UART_LSR_FE | UART_LSR_PE);
487 up->port.icount.brk++;
488 /*
489 * We do the SysRQ and SAK checking
490 * here because otherwise the break
491 * may get masked by ignore_status_mask
492 * or read_status_mask.
493 */
494 if (uart_handle_break(&up->port))
495 goto ignore_char;
496 } else if (*status & UART_LSR_PE)
497 up->port.icount.parity++;
498 else if (*status & UART_LSR_FE)
499 up->port.icount.frame++;
500 if (*status & UART_LSR_OE)
501 up->port.icount.overrun++;
502
503 /* Mask off conditions which should be ignored. */
504 *status &= up->port.read_status_mask;
505
506#ifdef CONFIG_SERIAL_MFD_HSU_CONSOLE
507 if (up->port.cons &&
508 up->port.cons->index == up->port.line) {
509 /* Recover the break flag from console xmit */
510 *status |= up->lsr_break_flag;
511 up->lsr_break_flag = 0;
512 }
513#endif
514 if (*status & UART_LSR_BI) {
515 flag = TTY_BREAK;
516 } else if (*status & UART_LSR_PE)
517 flag = TTY_PARITY;
518 else if (*status & UART_LSR_FE)
519 flag = TTY_FRAME;
520 }
521
522 if (uart_handle_sysrq_char(&up->port, ch))
523 goto ignore_char;
524
525 uart_insert_char(&up->port, *status, UART_LSR_OE, ch, flag);
526 ignore_char:
527 *status = serial_in(up, UART_LSR);
528 } while ((*status & UART_LSR_DR) && max_count--);
529 tty_flip_buffer_push(tty);
530}
531
532static void transmit_chars(struct uart_hsu_port *up)
533{
534 struct circ_buf *xmit = &up->port.state->xmit;
535 int count;
d843fc6e
FT		 536
537 if (up->port.x_char) {
538 serial_out(up, UART_TX, up->port.x_char);
539 up->port.icount.tx++;
540 up->port.x_char = 0;
541 return;
542 }
543 if (uart_circ_empty(xmit) || uart_tx_stopped(&up->port)) {
544 serial_hsu_stop_tx(&up->port);
545 return;
546 }
547
085a4f75 548 /* The IRQ is for TX FIFO half-empty */
d843fc6e 549 count = up->port.fifosize / 2;
085a4f75 550
d843fc6e
FT		 551 do {
552 serial_out(up, UART_TX, xmit->buf[xmit->tail]);
553 xmit->tail = (xmit->tail + 1) & (UART_XMIT_SIZE - 1);
d843fc6e
FT		 554
555 up->port.icount.tx++;
556 if (uart_circ_empty(xmit))
557 break;
558 } while (--count > 0);
559
560 if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS)
561 uart_write_wakeup(&up->port);
562
563 if (uart_circ_empty(xmit))
564 serial_hsu_stop_tx(&up->port);
565}
566
567static inline void check_modem_status(struct uart_hsu_port *up)
568{
569 int status;
570
571 status = serial_in(up, UART_MSR);
572
573 if ((status & UART_MSR_ANY_DELTA) == 0)
574 return;
575
576 if (status & UART_MSR_TERI)
577 up->port.icount.rng++;
578 if (status & UART_MSR_DDSR)
579 up->port.icount.dsr++;
580 /* We may only get DDCD when HW init and reset */
581 if (status & UART_MSR_DDCD)
582 uart_handle_dcd_change(&up->port, status & UART_MSR_DCD);
06c77e21 583 /* Will start/stop_tx accordingly */
d843fc6e
FT		 584 if (status & UART_MSR_DCTS)
585 uart_handle_cts_change(&up->port, status & UART_MSR_CTS);
586
587 wake_up_interruptible(&up->port.state->port.delta_msr_wait);
588}
589
590/*
591 * This handles the interrupt from one port.
592 */
593static irqreturn_t port_irq(int irq, void *dev_id)
594{
595 struct uart_hsu_port *up = dev_id;
596 unsigned int iir, lsr;
597 unsigned long flags;
598
599 if (unlikely(!up->running))
600 return IRQ_NONE;
601
06c77e21 602 spin_lock_irqsave(&up->port.lock, flags);
d843fc6e
FT		 603 if (up->use_dma) {
604 lsr = serial_in(up, UART_LSR);
605 if (unlikely(lsr & (UART_LSR_BI | UART_LSR_PE |
606 UART_LSR_FE | UART_LSR_OE)))
607 dev_warn(up->dev,
608 "Got lsr irq while using DMA, lsr = 0x%2x\n",
609 lsr);
610 check_modem_status(up);
06c77e21 611 spin_unlock_irqrestore(&up->port.lock, flags);
d843fc6e
FT		 612 return IRQ_HANDLED;
613 }
614
d843fc6e
FT		 615 iir = serial_in(up, UART_IIR);
616 if (iir & UART_IIR_NO_INT) {
617 spin_unlock_irqrestore(&up->port.lock, flags);
618 return IRQ_NONE;
619 }
620
621 lsr = serial_in(up, UART_LSR);
d843fc6e
FT		 622 if (lsr & UART_LSR_DR)
623 receive_chars(up, &lsr);
06c77e21 624 check_modem_status(up);
d843fc6e
FT		 625
626 /* lsr will be renewed during the receive_chars */
627 if (lsr & UART_LSR_THRE)
628 transmit_chars(up);
629
630 spin_unlock_irqrestore(&up->port.lock, flags);
631 return IRQ_HANDLED;
632}
633
634static inline void dma_chan_irq(struct hsu_dma_chan *chan)
635{
636 struct uart_hsu_port *up = chan->uport;
637 unsigned long flags;
638 u32 int_sts;
639
640 spin_lock_irqsave(&up->port.lock, flags);
641
642 if (!up->use_dma || !up->running)
643 goto exit;
644
645 /*
646 * No matter what situation, need read clear the IRQ status
647 * There is a bug, see Errata 5, HSD 2900918
648 */
649 int_sts = chan_readl(chan, HSU_CH_SR);
650
651 /* Rx channel */
652 if (chan->dirt == DMA_FROM_DEVICE)
653 hsu_dma_rx(up, int_sts);
654
655 /* Tx channel */
656 if (chan->dirt == DMA_TO_DEVICE) {
d843fc6e
FT		 657 chan_writel(chan, HSU_CH_CR, 0x0);
658 up->dma_tx_on = 0;
659 hsu_dma_tx(up);
660 }
661
662exit:
663 spin_unlock_irqrestore(&up->port.lock, flags);
664 return;
665}
666
667static irqreturn_t dma_irq(int irq, void *dev_id)
668{
669 struct hsu_port *hsu = dev_id;
670 u32 int_sts, i;
671
672 int_sts = mfd_readl(hsu, HSU_GBL_DMAISR);
673
674 /* Currently we only have 6 channels may be used */
675 for (i = 0; i < 6; i++) {
676 if (int_sts & 0x1)
677 dma_chan_irq(&hsu->chans[i]);
678 int_sts >>= 1;
679 }
680
681 return IRQ_HANDLED;
682}
683
684static unsigned int serial_hsu_tx_empty(struct uart_port *port)
685{
686 struct uart_hsu_port *up =
687 container_of(port, struct uart_hsu_port, port);
688 unsigned long flags;
689 unsigned int ret;
690
691 spin_lock_irqsave(&up->port.lock, flags);
692 ret = serial_in(up, UART_LSR) & UART_LSR_TEMT ? TIOCSER_TEMT : 0;
693 spin_unlock_irqrestore(&up->port.lock, flags);
694
695 return ret;
696}
697
698static unsigned int serial_hsu_get_mctrl(struct uart_port *port)
699{
700 struct uart_hsu_port *up =
701 container_of(port, struct uart_hsu_port, port);
702 unsigned char status;
703 unsigned int ret;
704
705 status = serial_in(up, UART_MSR);
706
707 ret = 0;
708 if (status & UART_MSR_DCD)
709 ret |= TIOCM_CAR;
710 if (status & UART_MSR_RI)
711 ret |= TIOCM_RNG;
712 if (status & UART_MSR_DSR)
713 ret |= TIOCM_DSR;
714 if (status & UART_MSR_CTS)
715 ret |= TIOCM_CTS;
716 return ret;
717}
718
719static void serial_hsu_set_mctrl(struct uart_port *port, unsigned int mctrl)
720{
721 struct uart_hsu_port *up =
722 container_of(port, struct uart_hsu_port, port);
723 unsigned char mcr = 0;
724
725 if (mctrl & TIOCM_RTS)
726 mcr |= UART_MCR_RTS;
727 if (mctrl & TIOCM_DTR)
728 mcr |= UART_MCR_DTR;
729 if (mctrl & TIOCM_OUT1)
730 mcr |= UART_MCR_OUT1;
731 if (mctrl & TIOCM_OUT2)
732 mcr |= UART_MCR_OUT2;
733 if (mctrl & TIOCM_LOOP)
734 mcr |= UART_MCR_LOOP;
735
736 mcr |= up->mcr;
737
738 serial_out(up, UART_MCR, mcr);
739}
740
741static void serial_hsu_break_ctl(struct uart_port *port, int break_state)
742{
743 struct uart_hsu_port *up =
744 container_of(port, struct uart_hsu_port, port);
745 unsigned long flags;
746
747 spin_lock_irqsave(&up->port.lock, flags);
748 if (break_state == -1)
749 up->lcr |= UART_LCR_SBC;
750 else
751 up->lcr &= ~UART_LCR_SBC;
752 serial_out(up, UART_LCR, up->lcr);
753 spin_unlock_irqrestore(&up->port.lock, flags);
754}
755
756/*
757 * What special to do:
758 * 1. chose the 64B fifo mode
085a4f75
FT		 759 * 2. start dma or pio depends on configuration
760 * 3. we only allocate dma memory when needed
d843fc6e
FT		 761 */
762static int serial_hsu_startup(struct uart_port *port)
763{
764 struct uart_hsu_port *up =
765 container_of(port, struct uart_hsu_port, port);
766 unsigned long flags;
767
88e5173f
KCA		 768 pm_runtime_get_sync(up->dev);
769
d843fc6e
FT		 770 /*
771 * Clear the FIFO buffers and disable them.
772 * (they will be reenabled in set_termios())
773 */
774 serial_out(up, UART_FCR, UART_FCR_ENABLE_FIFO);
775 serial_out(up, UART_FCR, UART_FCR_ENABLE_FIFO |
776 UART_FCR_CLEAR_RCVR | UART_FCR_CLEAR_XMIT);
777 serial_out(up, UART_FCR, 0);
778
779 /* Clear the interrupt registers. */
780 (void) serial_in(up, UART_LSR);
781 (void) serial_in(up, UART_RX);
782 (void) serial_in(up, UART_IIR);
783 (void) serial_in(up, UART_MSR);
784
785 /* Now, initialize the UART, default is 8n1 */
786 serial_out(up, UART_LCR, UART_LCR_WLEN8);
787
788 spin_lock_irqsave(&up->port.lock, flags);
789
790 up->port.mctrl |= TIOCM_OUT2;
791 serial_hsu_set_mctrl(&up->port, up->port.mctrl);
792
793 /*
794 * Finally, enable interrupts. Note: Modem status interrupts
795 * are set via set_termios(), which will be occurring imminently
796 * anyway, so we don't enable them here.
797 */
798 if (!up->use_dma)
799 up->ier = UART_IER_RLSI | UART_IER_RDI | UART_IER_RTOIE;
800 else
801 up->ier = 0;
802 serial_out(up, UART_IER, up->ier);
803
804 spin_unlock_irqrestore(&up->port.lock, flags);
805
806 /* DMA init */
d843fc6e
FT		 807 if (up->use_dma) {
808 struct hsu_dma_buffer *dbuf;
809 struct circ_buf *xmit = &port->state->xmit;
810
811 up->dma_tx_on = 0;
812
813 /* First allocate the RX buffer */
814 dbuf = &up->rxbuf;
815 dbuf->buf = kzalloc(HSU_DMA_BUF_SIZE, GFP_KERNEL);
816 if (!dbuf->buf) {
817 up->use_dma = 0;
818 goto exit;
819 }
820 dbuf->dma_addr = dma_map_single(port->dev,
821 dbuf->buf,
822 HSU_DMA_BUF_SIZE,
823 DMA_FROM_DEVICE);
824 dbuf->dma_size = HSU_DMA_BUF_SIZE;
825
826 /* Start the RX channel right now */
827 hsu_dma_start_rx_chan(up->rxc, dbuf);
828
829 /* Next init the TX DMA */
830 dbuf = &up->txbuf;
831 dbuf->buf = xmit->buf;
832 dbuf->dma_addr = dma_map_single(port->dev,
833 dbuf->buf,
834 UART_XMIT_SIZE,
835 DMA_TO_DEVICE);
836 dbuf->dma_size = UART_XMIT_SIZE;
837
838 /* This should not be changed all around */
839 chan_writel(up->txc, HSU_CH_BSR, 32);
840 chan_writel(up->txc, HSU_CH_MOTSR, 4);
841 dbuf->ofs = 0;
842 }
843
844exit:
845 /* And clear the interrupt registers again for luck. */
846 (void) serial_in(up, UART_LSR);
847 (void) serial_in(up, UART_RX);
848 (void) serial_in(up, UART_IIR);
849 (void) serial_in(up, UART_MSR);
850
851 up->running = 1;
852 return 0;
853}
854
855static void serial_hsu_shutdown(struct uart_port *port)
856{
857 struct uart_hsu_port *up =
858 container_of(port, struct uart_hsu_port, port);
859 unsigned long flags;
860
861 /* Disable interrupts from this port */
862 up->ier = 0;
863 serial_out(up, UART_IER, 0);
864 up->running = 0;
865
866 spin_lock_irqsave(&up->port.lock, flags);
867 up->port.mctrl &= ~TIOCM_OUT2;
868 serial_hsu_set_mctrl(&up->port, up->port.mctrl);
869 spin_unlock_irqrestore(&up->port.lock, flags);
870
871 /* Disable break condition and FIFOs */
872 serial_out(up, UART_LCR, serial_in(up, UART_LCR) & ~UART_LCR_SBC);
873 serial_out(up, UART_FCR, UART_FCR_ENABLE_FIFO |
874 UART_FCR_CLEAR_RCVR |
875 UART_FCR_CLEAR_XMIT);
876 serial_out(up, UART_FCR, 0);
88e5173f
KCA		 877
878 pm_runtime_put(up->dev);
d843fc6e
FT		 879}
880
881static void
882serial_hsu_set_termios(struct uart_port *port, struct ktermios *termios,
883 struct ktermios *old)
884{
885 struct uart_hsu_port *up =
886 container_of(port, struct uart_hsu_port, port);
887 struct tty_struct *tty = port->state->port.tty;
888 unsigned char cval, fcr = 0;
889 unsigned long flags;
890 unsigned int baud, quot;
a5880a9e 891 u32 ps, mul;
d843fc6e
FT		 892
893 switch (termios->c_cflag & CSIZE) {
894 case CS5:
895 cval = UART_LCR_WLEN5;
896 break;
897 case CS6:
898 cval = UART_LCR_WLEN6;
899 break;
900 case CS7:
901 cval = UART_LCR_WLEN7;
902 break;
903 default:
904 case CS8:
905 cval = UART_LCR_WLEN8;
906 break;
907 }
908
909 /* CMSPAR isn't supported by this driver */
910 if (tty)
911 tty->termios->c_cflag &= ~CMSPAR;
912
913 if (termios->c_cflag & CSTOPB)
914 cval |= UART_LCR_STOP;
915 if (termios->c_cflag & PARENB)
916 cval |= UART_LCR_PARITY;
917 if (!(termios->c_cflag & PARODD))
918 cval |= UART_LCR_EPAR;
919
920 /*
e5586ecc
FT		 921 * The base clk is 50Mhz, and the baud rate come from:
922 * baud = 50M * MUL / (DIV * PS * DLAB)
923 *
d843fc6e 924 * For those basic low baud rate we can get the direct
e5586ecc
FT		 925 * scalar from 2746800, like 115200 = 2746800/24. For those
926 * higher baud rate, we handle them case by case, mainly by
927 * adjusting the MUL/PS registers, and DIV register is kept
928 * as default value 0x3d09 to make things simple
d843fc6e
FT		 929 */
930 baud = uart_get_baud_rate(port, termios, old, 0, 4000000);
d843fc6e 931
e5586ecc 932 quot = 1;
a5880a9e
FT		 933 ps = 0x10;
934 mul = 0x3600;
d843fc6e
FT		 935 switch (baud) {
936 case 3500000:
937 mul = 0x3345;
938 ps = 0xC;
e5586ecc 939 break;
e5586ecc 940 case 1843200:
d843fc6e 941 mul = 0x2400;
d843fc6e 942 break;
a5880a9e
FT		 943 case 3000000:
944 case 2500000:
945 case 2000000:
d843fc6e 946 case 1500000:
e5586ecc 947 case 1000000:
e5586ecc 948 case 500000:
a5880a9e
FT		 949 /* mul/ps/quot = 0x9C4/0x10/0x1 will make a 500000 bps */
950 mul = baud / 500000 * 0x9C4;
d843fc6e
FT		 951 break;
952 default:
e5586ecc
FT		 953 /* Use uart_get_divisor to get quot for other baud rates */
954 quot = 0;
d843fc6e
FT		 955 }
956
e5586ecc
FT		 957 if (!quot)
958 quot = uart_get_divisor(port, baud);
959
d843fc6e
FT		 960 if ((up->port.uartclk / quot) < (2400 * 16))
961 fcr = UART_FCR_ENABLE_FIFO | UART_FCR_HSU_64_1B;
962 else if ((up->port.uartclk / quot) < (230400 * 16))
963 fcr = UART_FCR_ENABLE_FIFO | UART_FCR_HSU_64_16B;
964 else
965 fcr = UART_FCR_ENABLE_FIFO | UART_FCR_HSU_64_32B;
966
967 fcr |= UART_FCR_HSU_64B_FIFO;
d843fc6e
FT		 968
969 /*
970 * Ok, we're now changing the port state. Do it with
971 * interrupts disabled.
972 */
973 spin_lock_irqsave(&up->port.lock, flags);
974
975 /* Update the per-port timeout */
976 uart_update_timeout(port, termios->c_cflag, baud);
977
978 up->port.read_status_mask = UART_LSR_OE | UART_LSR_THRE | UART_LSR_DR;
979 if (termios->c_iflag & INPCK)
980 up->port.read_status_mask |= UART_LSR_FE | UART_LSR_PE;
981 if (termios->c_iflag & (BRKINT | PARMRK))
982 up->port.read_status_mask |= UART_LSR_BI;
983
984 /* Characters to ignore */
985 up->port.ignore_status_mask = 0;
986 if (termios->c_iflag & IGNPAR)
987 up->port.ignore_status_mask |= UART_LSR_PE | UART_LSR_FE;
988 if (termios->c_iflag & IGNBRK) {
989 up->port.ignore_status_mask |= UART_LSR_BI;
990 /*
991 * If we're ignoring parity and break indicators,
992 * ignore overruns too (for real raw support).
993 */
994 if (termios->c_iflag & IGNPAR)
995 up->port.ignore_status_mask |= UART_LSR_OE;
996 }
997
998 /* Ignore all characters if CREAD is not set */
999 if ((termios->c_cflag & CREAD) == 0)
1000 up->port.ignore_status_mask |= UART_LSR_DR;
1001
1002 /*
1003 * CTS flow control flag and modem status interrupts, disable
1004 * MSI by default
1005 */
1006 up->ier &= ~UART_IER_MSI;
1007 if (UART_ENABLE_MS(&up->port, termios->c_cflag))
1008 up->ier |= UART_IER_MSI;
1009
1010 serial_out(up, UART_IER, up->ier);
1011
1012 if (termios->c_cflag & CRTSCTS)
1013 up->mcr |= UART_MCR_AFE | UART_MCR_RTS;
1014 else
1015 up->mcr &= ~UART_MCR_AFE;
1016
1017 serial_out(up, UART_LCR, cval | UART_LCR_DLAB); /* set DLAB */
1018 serial_out(up, UART_DLL, quot & 0xff); /* LS of divisor */
1019 serial_out(up, UART_DLM, quot >> 8); /* MS of divisor */
1020 serial_out(up, UART_LCR, cval); /* reset DLAB */
1021 serial_out(up, UART_MUL, mul); /* set MUL */
1022 serial_out(up, UART_PS, ps); /* set PS */
1023 up->lcr = cval; /* Save LCR */
1024 serial_hsu_set_mctrl(&up->port, up->port.mctrl);
1025 serial_out(up, UART_FCR, fcr);
1026 spin_unlock_irqrestore(&up->port.lock, flags);
1027}
1028
1029static void
1030serial_hsu_pm(struct uart_port *port, unsigned int state,
1031 unsigned int oldstate)
1032{
1033}
1034
1035static void serial_hsu_release_port(struct uart_port *port)
1036{
1037}
1038
1039static int serial_hsu_request_port(struct uart_port *port)
1040{
1041 return 0;
1042}
1043
1044static void serial_hsu_config_port(struct uart_port *port, int flags)
1045{
d843fc6e
FT		 1046 struct uart_hsu_port *up =
1047 container_of(port, struct uart_hsu_port, port);
1048 up->port.type = PORT_MFD;
d843fc6e
FT		 1049}
1050
1051static int
1052serial_hsu_verify_port(struct uart_port *port, struct serial_struct *ser)
1053{
1054 /* We don't want the core code to modify any port params */
1055 return -EINVAL;
1056}
1057
1058static const char *
1059serial_hsu_type(struct uart_port *port)
1060{
1061 struct uart_hsu_port *up =
1062 container_of(port, struct uart_hsu_port, port);
1063 return up->name;
1064}
1065
1066/* Mainly for uart console use */
1067static struct uart_hsu_port *serial_hsu_ports[3];
1068static struct uart_driver serial_hsu_reg;
1069
1070#ifdef CONFIG_SERIAL_MFD_HSU_CONSOLE
1071
1072#define BOTH_EMPTY (UART_LSR_TEMT | UART_LSR_THRE)
1073
1074/* Wait for transmitter & holding register to empty */
1075static inline void wait_for_xmitr(struct uart_hsu_port *up)
1076{
1077 unsigned int status, tmout = 1000;
1078
1079 /* Wait up to 1ms for the character to be sent. */
1080 do {
1081 status = serial_in(up, UART_LSR);
1082
1083 if (status & UART_LSR_BI)
1084 up->lsr_break_flag = UART_LSR_BI;
1085
1086 if (--tmout == 0)
1087 break;
1088 udelay(1);
1089 } while (!(status & BOTH_EMPTY));
1090
1091 /* Wait up to 1s for flow control if necessary */
1092 if (up->port.flags & UPF_CONS_FLOW) {
1093 tmout = 1000000;
1094 while (--tmout &&
1095 ((serial_in(up, UART_MSR) & UART_MSR_CTS) == 0))
1096 udelay(1);
1097 }
1098}
1099
1100static void serial_hsu_console_putchar(struct uart_port *port, int ch)
1101{
1102 struct uart_hsu_port *up =
1103 container_of(port, struct uart_hsu_port, port);
1104
1105 wait_for_xmitr(up);
1106 serial_out(up, UART_TX, ch);
1107}
1108
1109/*
1110 * Print a string to the serial port trying not to disturb
1111 * any possible real use of the port...
1112 *
1113 * The console_lock must be held when we get here.
1114 */
1115static void
1116serial_hsu_console_write(struct console *co, const char *s, unsigned int count)
1117{
1118 struct uart_hsu_port *up = serial_hsu_ports[co->index];
1119 unsigned long flags;
1120 unsigned int ier;
1121 int locked = 1;
1122
1123 local_irq_save(flags);
1124 if (up->port.sysrq)
1125 locked = 0;
1126 else if (oops_in_progress) {
1127 locked = spin_trylock(&up->port.lock);
1128 } else
1129 spin_lock(&up->port.lock);
1130
1131 /* First save the IER then disable the interrupts */
1132 ier = serial_in(up, UART_IER);
1133 serial_out(up, UART_IER, 0);
1134
1135 uart_console_write(&up->port, s, count, serial_hsu_console_putchar);
1136
1137 /*
1138 * Finally, wait for transmitter to become empty
1139 * and restore the IER
1140 */
1141 wait_for_xmitr(up);
1142 serial_out(up, UART_IER, ier);
1143
1144 if (locked)
1145 spin_unlock(&up->port.lock);
1146 local_irq_restore(flags);
1147}
1148
1149static struct console serial_hsu_console;
1150
1151static int __init
1152serial_hsu_console_setup(struct console *co, char *options)
1153{
1154 struct uart_hsu_port *up;
1155 int baud = 115200;
1156 int bits = 8;
1157 int parity = 'n';
1158 int flow = 'n';
1159 int ret;
1160
1161 if (co->index == -1 || co->index >= serial_hsu_reg.nr)
1162 co->index = 0;
1163 up = serial_hsu_ports[co->index];
1164 if (!up)
1165 return -ENODEV;
1166
1167 if (options)
1168 uart_parse_options(options, &baud, &parity, &bits, &flow);
1169
1170 ret = uart_set_options(&up->port, co, baud, parity, bits, flow);
1171
1172 return ret;
1173}
1174
1175static struct console serial_hsu_console = {
1176 .name = "ttyMFD",
1177 .write = serial_hsu_console_write,
1178 .device = uart_console_device,
1179 .setup = serial_hsu_console_setup,
1180 .flags = CON_PRINTBUFFER,
1181 .index = 2,
1182 .data = &serial_hsu_reg,
1183};
1184#endif
1185
1186struct uart_ops serial_hsu_pops = {
1187 .tx_empty = serial_hsu_tx_empty,
1188 .set_mctrl = serial_hsu_set_mctrl,
1189 .get_mctrl = serial_hsu_get_mctrl,
1190 .stop_tx = serial_hsu_stop_tx,
1191 .start_tx = serial_hsu_start_tx,
1192 .stop_rx = serial_hsu_stop_rx,
1193 .enable_ms = serial_hsu_enable_ms,
1194 .break_ctl = serial_hsu_break_ctl,
1195 .startup = serial_hsu_startup,
1196 .shutdown = serial_hsu_shutdown,
1197 .set_termios = serial_hsu_set_termios,
1198 .pm = serial_hsu_pm,
1199 .type = serial_hsu_type,
1200 .release_port = serial_hsu_release_port,
1201 .request_port = serial_hsu_request_port,
1202 .config_port = serial_hsu_config_port,
1203 .verify_port = serial_hsu_verify_port,
1204};
1205
1206static struct uart_driver serial_hsu_reg = {
1207 .owner = THIS_MODULE,
1208 .driver_name = "MFD serial",
1209 .dev_name = "ttyMFD",
1210 .major = TTY_MAJOR,
1211 .minor = 128,
1212 .nr = 3,
1213};
1214
1215#ifdef CONFIG_PM
1216static int serial_hsu_suspend(struct pci_dev *pdev, pm_message_t state)
1217{
3c4108c8 1218 void *priv = pci_get_drvdata(pdev);
d843fc6e
FT		 1219 struct uart_hsu_port *up;
1220
3c4108c8
FT		 1221 /* Make sure this is not the internal dma controller */
1222 if (priv && (pdev->device != 0x081E)) {
1223 up = priv;
1224 uart_suspend_port(&serial_hsu_reg, &up->port);
1225 }
d843fc6e 1226
3c4108c8
FT		 1227 pci_save_state(pdev);
1228 pci_set_power_state(pdev, pci_choose_state(pdev, state));
d843fc6e
FT		 1229 return 0;
1230}
1231
1232static int serial_hsu_resume(struct pci_dev *pdev)
1233{
3c4108c8 1234 void *priv = pci_get_drvdata(pdev);
d843fc6e 1235 struct uart_hsu_port *up;
3c4108c8 1236 int ret;
d843fc6e 1237
3c4108c8
FT		 1238 pci_set_power_state(pdev, PCI_D0);
1239 pci_restore_state(pdev);
1240
1241 ret = pci_enable_device(pdev);
1242 if (ret)
1243 dev_warn(&pdev->dev,
1244 "HSU: can't re-enable device, try to continue\n");
1245
1246 if (priv && (pdev->device != 0x081E)) {
1247 up = priv;
1248 uart_resume_port(&serial_hsu_reg, &up->port);
1249 }
d843fc6e
FT		 1250 return 0;
1251}
1252#else
1253#define serial_hsu_suspend NULL
1254#define serial_hsu_resume NULL
1255#endif
1256
88e5173f
KCA		 1257#ifdef CONFIG_PM_RUNTIME
1258static int serial_hsu_runtime_idle(struct device *dev)
1259{
1260 int err;
1261
1262 err = pm_schedule_suspend(dev, 500);
1263 if (err)
1264 return -EBUSY;
1265
1266 return 0;
1267}
1268
1269static int serial_hsu_runtime_suspend(struct device *dev)
1270{
1271 return 0;
1272}
1273
1274static int serial_hsu_runtime_resume(struct device *dev)
1275{
1276 return 0;
1277}
1278#else
1279#define serial_hsu_runtime_idle NULL
1280#define serial_hsu_runtime_suspend NULL
1281#define serial_hsu_runtime_resume NULL
1282#endif
1283
1284static const struct dev_pm_ops serial_hsu_pm_ops = {
1285 .runtime_suspend = serial_hsu_runtime_suspend,
1286 .runtime_resume = serial_hsu_runtime_resume,
1287 .runtime_idle = serial_hsu_runtime_idle,
1288};
1289
d843fc6e
FT		 1290/* temp global pointer before we settle down on using one or four PCI dev */
1291static struct hsu_port *phsu;
1292
1293static int serial_hsu_probe(struct pci_dev *pdev,
1294 const struct pci_device_id *ent)
1295{
1296 struct uart_hsu_port *uport;
1297 int index, ret;
1298
1299 printk(KERN_INFO "HSU: found PCI Serial controller(ID: %04x:%04x)\n",
1300 pdev->vendor, pdev->device);
1301
1302 switch (pdev->device) {
1303 case 0x081B:
1304 index = 0;
1305 break;
1306 case 0x081C:
1307 index = 1;
1308 break;
1309 case 0x081D:
1310 index = 2;
1311 break;
1312 case 0x081E:
1313 /* internal DMA controller */
1314 index = 3;
1315 break;
1316 default:
1317 dev_err(&pdev->dev, "HSU: out of index!");
1318 return -ENODEV;
1319 }
1320
1321 ret = pci_enable_device(pdev);
1322 if (ret)
1323 return ret;
1324
1325 if (index == 3) {
1326 /* DMA controller */
1327 ret = request_irq(pdev->irq, dma_irq, 0, "hsu_dma", phsu);
1328 if (ret) {
1329 dev_err(&pdev->dev, "can not get IRQ\n");
1330 goto err_disable;
1331 }
1332 pci_set_drvdata(pdev, phsu);
1333 } else {
1334 /* UART port 0~2 */
1335 uport = &phsu->port[index];
1336 uport->port.irq = pdev->irq;
1337 uport->port.dev = &pdev->dev;
1338 uport->dev = &pdev->dev;
1339
1340 ret = request_irq(pdev->irq, port_irq, 0, uport->name, uport);
1341 if (ret) {
1342 dev_err(&pdev->dev, "can not get IRQ\n");
1343 goto err_disable;
1344 }
1345 uart_add_one_port(&serial_hsu_reg, &uport->port);
1346
1347#ifdef CONFIG_SERIAL_MFD_HSU_CONSOLE
1348 if (index == 2) {
1349 register_console(&serial_hsu_console);
1350 uport->port.cons = &serial_hsu_console;
1351 }
1352#endif
1353 pci_set_drvdata(pdev, uport);
1354 }
1355
88e5173f
KCA		 1356 pm_runtime_put_noidle(&pdev->dev);
1357 pm_runtime_allow(&pdev->dev);
1358
d843fc6e
FT		 1359 return 0;
1360
1361err_disable:
1362 pci_disable_device(pdev);
1363 return ret;
1364}
1365
1366static void hsu_global_init(void)
1367{
1368 struct hsu_port *hsu;
1369 struct uart_hsu_port *uport;
1370 struct hsu_dma_chan *dchan;
1371 int i, ret;
1372
1373 hsu = kzalloc(sizeof(struct hsu_port), GFP_KERNEL);
1374 if (!hsu)
1375 return;
1376
1377 /* Get basic io resource and map it */
1378 hsu->paddr = 0xffa28000;
1379 hsu->iolen = 0x1000;
1380
1381 if (!(request_mem_region(hsu->paddr, hsu->iolen, "HSU global")))
1382 pr_warning("HSU: error in request mem region\n");
1383
1384 hsu->reg = ioremap_nocache((unsigned long)hsu->paddr, hsu->iolen);
1385 if (!hsu->reg) {
1386 pr_err("HSU: error in ioremap\n");
1387 ret = -ENOMEM;
1388 goto err_free_region;
1389 }
1390
1391 /* Initialise the 3 UART ports */
1392 uport = hsu->port;
1393 for (i = 0; i < 3; i++) {
1394 uport->port.type = PORT_MFD;
1395 uport->port.iotype = UPIO_MEM;
1396 uport->port.mapbase = (resource_size_t)hsu->paddr
1397 + HSU_PORT_REG_OFFSET
1398 + i * HSU_PORT_REG_LENGTH;
1399 uport->port.membase = hsu->reg + HSU_PORT_REG_OFFSET
1400 + i * HSU_PORT_REG_LENGTH;
1401
1402 sprintf(uport->name, "hsu_port%d", i);
1403 uport->port.fifosize = 64;
1404 uport->port.ops = &serial_hsu_pops;
1405 uport->port.line = i;
1406 uport->port.flags = UPF_IOREMAP;
06c77e21 1407 /* set the scalable maxim support rate to 2746800 bps */
d843fc6e
FT		 1408 uport->port.uartclk = 115200 * 24 * 16;
1409
1410 uport->running = 0;
1411 uport->txc = &hsu->chans[i * 2];
1412 uport->rxc = &hsu->chans[i * 2 + 1];
1413
1414 serial_hsu_ports[i] = uport;
1415 uport->index = i;
f023eab3
FT		 1416
1417 if (hsu_dma_enable & (1<<i))
1418 uport->use_dma = 1;
1419 else
1420 uport->use_dma = 0;
1421
d843fc6e
FT		 1422 uport++;
1423 }
1424
1425 /* Initialise 6 dma channels */
1426 dchan = hsu->chans;
1427 for (i = 0; i < 6; i++) {
1428 dchan->id = i;
1429 dchan->dirt = (i & 0x1) ? DMA_FROM_DEVICE : DMA_TO_DEVICE;
1430 dchan->uport = &hsu->port[i/2];
1431 dchan->reg = hsu->reg + HSU_DMA_CHANS_REG_OFFSET +
1432 i * HSU_DMA_CHANS_REG_LENGTH;
669b7a09 1433
d843fc6e
FT		 1434 dchan++;
1435 }
1436
1437 phsu = hsu;
d843fc6e
FT		 1438 hsu_debugfs_init(hsu);
1439 return;
1440
1441err_free_region:
1442 release_mem_region(hsu->paddr, hsu->iolen);
1443 kfree(hsu);
1444 return;
1445}
1446
1447static void serial_hsu_remove(struct pci_dev *pdev)
1448{
e3671ac4
FT		 1449 void *priv = pci_get_drvdata(pdev);
1450 struct uart_hsu_port *up;
d843fc6e 1451
e3671ac4 1452 if (!priv)
d843fc6e
FT		 1453 return;
1454
88e5173f
KCA		 1455 pm_runtime_forbid(&pdev->dev);
1456 pm_runtime_get_noresume(&pdev->dev);
1457
e3671ac4
FT		 1458 /* For port 0/1/2, priv is the address of uart_hsu_port */
1459 if (pdev->device != 0x081E) {
1460 up = priv;
1461 uart_remove_one_port(&serial_hsu_reg, &up->port);
1462 }
d843fc6e
FT		 1463
1464 pci_set_drvdata(pdev, NULL);
e3671ac4 1465 free_irq(pdev->irq, priv);
d843fc6e
FT		 1466 pci_disable_device(pdev);
1467}
1468
1469/* First 3 are UART ports, and the 4th is the DMA */
1470static const struct pci_device_id pci_ids[] __devinitdata = {
1471 { PCI_DEVICE(PCI_VENDOR_ID_INTEL, 0x081B) },
1472 { PCI_DEVICE(PCI_VENDOR_ID_INTEL, 0x081C) },
1473 { PCI_DEVICE(PCI_VENDOR_ID_INTEL, 0x081D) },
1474 { PCI_DEVICE(PCI_VENDOR_ID_INTEL, 0x081E) },
1475 {},
1476};
1477
1478static struct pci_driver hsu_pci_driver = {
1479 .name = "HSU serial",
1480 .id_table = pci_ids,
1481 .probe = serial_hsu_probe,
1482 .remove = __devexit_p(serial_hsu_remove),
1483 .suspend = serial_hsu_suspend,
1484 .resume = serial_hsu_resume,
88e5173f
KCA		 1485 .driver = {
1486 .pm = &serial_hsu_pm_ops,
1487 },
d843fc6e
FT		 1488};
1489
1490static int __init hsu_pci_init(void)
1491{
1492 int ret;
1493
1494 hsu_global_init();
1495
1496 ret = uart_register_driver(&serial_hsu_reg);
1497 if (ret)
1498 return ret;
1499
1500 return pci_register_driver(&hsu_pci_driver);
1501}
1502
1503static void __exit hsu_pci_exit(void)
1504{
1505 pci_unregister_driver(&hsu_pci_driver);
1506 uart_unregister_driver(&serial_hsu_reg);
1507
1508 hsu_debugfs_remove(phsu);
1509
1510 kfree(phsu);
1511}
1512
1513module_init(hsu_pci_init);
1514module_exit(hsu_pci_exit);
1515
1516MODULE_LICENSE("GPL v2");
1517MODULE_ALIAS("platform:medfield-hsu");
ubuntu-zesty-kernel mirror