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drivers/usb/class/cdc-acm.c: clear dangling pointer
[linux-2.6/linux-acpi-2.6/ibm-acpi-2.6.git] / drivers / tty / serial / mfd.c
blobcab52f4a88b0309fbccb2331fe93d1053a69ca94
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. The RI/DSR/DCD/DTR are not pinned out, DCD & DSR are always
20 * asserted, only when the HW is reset the DDCD and DDSR will
21 * be triggered
22 */
23
24 #include <linux/module.h>
25 #include <linux/init.h>
26 #include <linux/console.h>
27 #include <linux/sysrq.h>
28 #include <linux/slab.h>
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>
41
42 #define HSU_DMA_BUF_SIZE 2048
43
44 #define chan_readl(chan, offset) readl(chan->reg + offset)
45 #define chan_writel(chan, offset, val) writel(val, chan->reg + offset)
46
47 #define mfd_readl(obj, offset) readl(obj->reg + offset)
48 #define mfd_writel(obj, offset, val) writel(val, obj->reg + offset)
49
50 static int hsu_dma_enable;
51 module_param(hsu_dma_enable, int, 0);
52 MODULE_PARM_DESC(hsu_dma_enable,
53 "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.");
54
55 struct hsu_dma_buffer {
56 u8 *buf;
57 dma_addr_t dma_addr;
58 u32 dma_size;
59 u32 ofs;
60 };
61
62 struct hsu_dma_chan {
63 u32 id;
64 enum dma_data_direction dirt;
65 struct uart_hsu_port *uport;
66 void __iomem *reg;
67 };
68
69 struct uart_hsu_port {
70 struct uart_port port;
71 unsigned char ier;
72 unsigned char lcr;
73 unsigned char mcr;
74 unsigned int lsr_break_flag;
75 char name[12];
76 int index;
77 struct device *dev;
78
79 struct hsu_dma_chan *txc;
80 struct hsu_dma_chan *rxc;
81 struct hsu_dma_buffer txbuf;
82 struct hsu_dma_buffer rxbuf;
83 int use_dma; /* flag for DMA/PIO */
84 int running;
85 int dma_tx_on;
86 };
87
88 /* Top level data structure of HSU */
89 struct hsu_port {
90 void __iomem *reg;
91 unsigned long paddr;
92 unsigned long iolen;
93 u32 irq;
94
95 struct uart_hsu_port port[3];
96 struct hsu_dma_chan chans[10];
97
98 struct dentry *debugfs;
99 };
100
101 static inline unsigned int serial_in(struct uart_hsu_port *up, int offset)
102 {
103 unsigned int val;
104
105 if (offset > UART_MSR) {
106 offset <<= 2;
107 val = readl(up->port.membase + offset);
108 } else
109 val = (unsigned int)readb(up->port.membase + offset);
110
111 return val;
112 }
113
114 static inline void serial_out(struct uart_hsu_port *up, int offset, int value)
115 {
116 if (offset > UART_MSR) {
117 offset <<= 2;
118 writel(value, up->port.membase + offset);
119 } else {
120 unsigned char val = value & 0xff;
121 writeb(val, up->port.membase + offset);
122 }
123 }
124
125 #ifdef CONFIG_DEBUG_FS
126
127 #define HSU_REGS_BUFSIZE 1024
128
129 static int hsu_show_regs_open(struct inode *inode, struct file *file)
130 {
131 file->private_data = inode->i_private;
132 return 0;
133 }
134
135 static ssize_t port_show_regs(struct file *file, char __user *user_buf,
136 size_t count, loff_t *ppos)
137 {
138 struct uart_hsu_port *up = file->private_data;
139 char *buf;
140 u32 len = 0;
141 ssize_t ret;
142
143 buf = kzalloc(HSU_REGS_BUFSIZE, GFP_KERNEL);
144 if (!buf)
145 return 0;
146
147 len += snprintf(buf + len, HSU_REGS_BUFSIZE - len,
148 "MFD HSU port[%d] regs:\n", up->index);
149
150 len += snprintf(buf + len, HSU_REGS_BUFSIZE - len,
151 "=================================\n");
152 len += snprintf(buf + len, HSU_REGS_BUFSIZE - len,
153 "IER: \t\t0x%08x\n", serial_in(up, UART_IER));
154 len += snprintf(buf + len, HSU_REGS_BUFSIZE - len,
155 "IIR: \t\t0x%08x\n", serial_in(up, UART_IIR));
156 len += snprintf(buf + len, HSU_REGS_BUFSIZE - len,
157 "LCR: \t\t0x%08x\n", serial_in(up, UART_LCR));
158 len += snprintf(buf + len, HSU_REGS_BUFSIZE - len,
159 "MCR: \t\t0x%08x\n", serial_in(up, UART_MCR));
160 len += snprintf(buf + len, HSU_REGS_BUFSIZE - len,
161 "LSR: \t\t0x%08x\n", serial_in(up, UART_LSR));
162 len += snprintf(buf + len, HSU_REGS_BUFSIZE - len,
163 "MSR: \t\t0x%08x\n", serial_in(up, UART_MSR));
164 len += snprintf(buf + len, HSU_REGS_BUFSIZE - len,
165 "FOR: \t\t0x%08x\n", serial_in(up, UART_FOR));
166 len += snprintf(buf + len, HSU_REGS_BUFSIZE - len,
167 "PS: \t\t0x%08x\n", serial_in(up, UART_PS));
168 len += snprintf(buf + len, HSU_REGS_BUFSIZE - len,
169 "MUL: \t\t0x%08x\n", serial_in(up, UART_MUL));
170 len += snprintf(buf + len, HSU_REGS_BUFSIZE - len,
171 "DIV: \t\t0x%08x\n", serial_in(up, UART_DIV));
172
173 if (len > HSU_REGS_BUFSIZE)
174 len = HSU_REGS_BUFSIZE;
175
176 ret = simple_read_from_buffer(user_buf, count, ppos, buf, len);
177 kfree(buf);
178 return ret;
179 }
180
181 static ssize_t dma_show_regs(struct file *file, char __user *user_buf,
182 size_t count, loff_t *ppos)
183 {
184 struct hsu_dma_chan *chan = file->private_data;
185 char *buf;
186 u32 len = 0;
187 ssize_t ret;
188
189 buf = kzalloc(HSU_REGS_BUFSIZE, GFP_KERNEL);
190 if (!buf)
191 return 0;
192
193 len += snprintf(buf + len, HSU_REGS_BUFSIZE - len,
194 "MFD HSU DMA channel [%d] regs:\n", chan->id);
195
196 len += snprintf(buf + len, HSU_REGS_BUFSIZE - len,
197 "=================================\n");
198 len += snprintf(buf + len, HSU_REGS_BUFSIZE - len,
199 "CR: \t\t0x%08x\n", chan_readl(chan, HSU_CH_CR));
200 len += snprintf(buf + len, HSU_REGS_BUFSIZE - len,
201 "DCR: \t\t0x%08x\n", chan_readl(chan, HSU_CH_DCR));
202 len += snprintf(buf + len, HSU_REGS_BUFSIZE - len,
203 "BSR: \t\t0x%08x\n", chan_readl(chan, HSU_CH_BSR));
204 len += snprintf(buf + len, HSU_REGS_BUFSIZE - len,
205 "MOTSR: \t\t0x%08x\n", chan_readl(chan, HSU_CH_MOTSR));
206 len += snprintf(buf + len, HSU_REGS_BUFSIZE - len,
207 "D0SAR: \t\t0x%08x\n", chan_readl(chan, HSU_CH_D0SAR));
208 len += snprintf(buf + len, HSU_REGS_BUFSIZE - len,
209 "D0TSR: \t\t0x%08x\n", chan_readl(chan, HSU_CH_D0TSR));
210 len += snprintf(buf + len, HSU_REGS_BUFSIZE - len,
211 "D0SAR: \t\t0x%08x\n", chan_readl(chan, HSU_CH_D1SAR));
212 len += snprintf(buf + len, HSU_REGS_BUFSIZE - len,
213 "D0TSR: \t\t0x%08x\n", chan_readl(chan, HSU_CH_D1TSR));
214 len += snprintf(buf + len, HSU_REGS_BUFSIZE - len,
215 "D0SAR: \t\t0x%08x\n", chan_readl(chan, HSU_CH_D2SAR));
216 len += snprintf(buf + len, HSU_REGS_BUFSIZE - len,
217 "D0TSR: \t\t0x%08x\n", chan_readl(chan, HSU_CH_D2TSR));
218 len += snprintf(buf + len, HSU_REGS_BUFSIZE - len,
219 "D0SAR: \t\t0x%08x\n", chan_readl(chan, HSU_CH_D3SAR));
220 len += snprintf(buf + len, HSU_REGS_BUFSIZE - len,
221 "D0TSR: \t\t0x%08x\n", chan_readl(chan, HSU_CH_D3TSR));
222
223 if (len > HSU_REGS_BUFSIZE)
224 len = HSU_REGS_BUFSIZE;
225
226 ret = simple_read_from_buffer(user_buf, count, ppos, buf, len);
227 kfree(buf);
228 return ret;
229 }
230
231 static const struct file_operations port_regs_ops = {
232 .owner = THIS_MODULE,
233 .open = hsu_show_regs_open,
234 .read = port_show_regs,
235 .llseek = default_llseek,
236 };
237
238 static const struct file_operations dma_regs_ops = {
239 .owner = THIS_MODULE,
240 .open = hsu_show_regs_open,
241 .read = dma_show_regs,
242 .llseek = default_llseek,
243 };
244
245 static int hsu_debugfs_init(struct hsu_port *hsu)
246 {
247 int i;
248 char name[32];
249
250 hsu->debugfs = debugfs_create_dir("hsu", NULL);
251 if (!hsu->debugfs)
252 return -ENOMEM;
253
254 for (i = 0; i < 3; i++) {
255 snprintf(name, sizeof(name), "port_%d_regs", i);
256 debugfs_create_file(name, S_IFREG | S_IRUGO,
257 hsu->debugfs, (void *)(&hsu->port[i]), &port_regs_ops);
258 }
259
260 for (i = 0; i < 6; i++) {
261 snprintf(name, sizeof(name), "dma_chan_%d_regs", i);
262 debugfs_create_file(name, S_IFREG | S_IRUGO,
263 hsu->debugfs, (void *)&hsu->chans[i], &dma_regs_ops);
264 }
265
266 return 0;
267 }
268
269 static void hsu_debugfs_remove(struct hsu_port *hsu)
270 {
271 if (hsu->debugfs)
272 debugfs_remove_recursive(hsu->debugfs);
273 }
274
275 #else
276 static inline int hsu_debugfs_init(struct hsu_port *hsu)
277 {
278 return 0;
279 }
280
281 static inline void hsu_debugfs_remove(struct hsu_port *hsu)
282 {
283 }
284 #endif /* CONFIG_DEBUG_FS */
285
286 static void serial_hsu_enable_ms(struct uart_port *port)
287 {
288 struct uart_hsu_port *up =
289 container_of(port, struct uart_hsu_port, port);
290
291 up->ier |= UART_IER_MSI;
292 serial_out(up, UART_IER, up->ier);
293 }
294
295 void hsu_dma_tx(struct uart_hsu_port *up)
296 {
297 struct circ_buf *xmit = &up->port.state->xmit;
298 struct hsu_dma_buffer *dbuf = &up->txbuf;
299 int count;
300
301 /* test_and_set_bit may be better, but anyway it's in lock protected mode */
302 if (up->dma_tx_on)
303 return;
304
305 /* Update the circ buf info */
306 xmit->tail += dbuf->ofs;
307 xmit->tail &= UART_XMIT_SIZE - 1;
308
309 up->port.icount.tx += dbuf->ofs;
310 dbuf->ofs = 0;
311
312 /* Disable the channel */
313 chan_writel(up->txc, HSU_CH_CR, 0x0);
314
315 if (!uart_circ_empty(xmit) && !uart_tx_stopped(&up->port)) {
316 dma_sync_single_for_device(up->port.dev,
317 dbuf->dma_addr,
318 dbuf->dma_size,
319 DMA_TO_DEVICE);
320
321 count = CIRC_CNT_TO_END(xmit->head, xmit->tail, UART_XMIT_SIZE);
322 dbuf->ofs = count;
323
324 /* Reprogram the channel */
325 chan_writel(up->txc, HSU_CH_D0SAR, dbuf->dma_addr + xmit->tail);
326 chan_writel(up->txc, HSU_CH_D0TSR, count);
327
328 /* Reenable the channel */
329 chan_writel(up->txc, HSU_CH_DCR, 0x1
330 | (0x1 << 8)
331 | (0x1 << 16)
332 | (0x1 << 24));
333 up->dma_tx_on = 1;
334 chan_writel(up->txc, HSU_CH_CR, 0x1);
335 }
336
337 if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS)
338 uart_write_wakeup(&up->port);
339 }
340
341 /* The buffer is already cache coherent */
342 void hsu_dma_start_rx_chan(struct hsu_dma_chan *rxc, struct hsu_dma_buffer *dbuf)
343 {
344 dbuf->ofs = 0;
345
346 chan_writel(rxc, HSU_CH_BSR, 32);
347 chan_writel(rxc, HSU_CH_MOTSR, 4);
348
349 chan_writel(rxc, HSU_CH_D0SAR, dbuf->dma_addr);
350 chan_writel(rxc, HSU_CH_D0TSR, dbuf->dma_size);
351 chan_writel(rxc, HSU_CH_DCR, 0x1 | (0x1 << 8)
352 | (0x1 << 16)
353 | (0x1 << 24) /* timeout bit, see HSU Errata 1 */
354 );
355 chan_writel(rxc, HSU_CH_CR, 0x3);
356 }
357
358 /* Protected by spin_lock_irqsave(port->lock) */
359 static void serial_hsu_start_tx(struct uart_port *port)
360 {
361 struct uart_hsu_port *up =
362 container_of(port, struct uart_hsu_port, port);
363
364 if (up->use_dma) {
365 hsu_dma_tx(up);
366 } else if (!(up->ier & UART_IER_THRI)) {
367 up->ier |= UART_IER_THRI;
368 serial_out(up, UART_IER, up->ier);
369 }
370 }
371
372 static void serial_hsu_stop_tx(struct uart_port *port)
373 {
374 struct uart_hsu_port *up =
375 container_of(port, struct uart_hsu_port, port);
376 struct hsu_dma_chan *txc = up->txc;
377
378 if (up->use_dma)
379 chan_writel(txc, HSU_CH_CR, 0x0);
380 else if (up->ier & UART_IER_THRI) {
381 up->ier &= ~UART_IER_THRI;
382 serial_out(up, UART_IER, up->ier);
383 }
384 }
385
386 /* This is always called in spinlock protected mode, so
387 * modify timeout timer is safe here */
388 void hsu_dma_rx(struct uart_hsu_port *up, u32 int_sts)
389 {
390 struct hsu_dma_buffer *dbuf = &up->rxbuf;
391 struct hsu_dma_chan *chan = up->rxc;
392 struct uart_port *port = &up->port;
393 struct tty_struct *tty = port->state->port.tty;
394 int count;
395
396 if (!tty)
397 return;
398
399 /*
400 * First need to know how many is already transferred,
401 * then check if its a timeout DMA irq, and return
402 * the trail bytes out, push them up and reenable the
403 * channel
404 */
405
406 /* Timeout IRQ, need wait some time, see Errata 2 */
407 if (int_sts & 0xf00)
408 udelay(2);
409
410 /* Stop the channel */
411 chan_writel(chan, HSU_CH_CR, 0x0);
412
413 count = chan_readl(chan, HSU_CH_D0SAR) - dbuf->dma_addr;
414 if (!count) {
415 /* Restart the channel before we leave */
416 chan_writel(chan, HSU_CH_CR, 0x3);
417 return;
418 }
419
420 dma_sync_single_for_cpu(port->dev, dbuf->dma_addr,
421 dbuf->dma_size, DMA_FROM_DEVICE);
422
423 /*
424 * Head will only wrap around when we recycle
425 * the DMA buffer, and when that happens, we
426 * explicitly set tail to 0. So head will
427 * always be greater than tail.
428 */
429 tty_insert_flip_string(tty, dbuf->buf, count);
430 port->icount.rx += count;
431
432 dma_sync_single_for_device(up->port.dev, dbuf->dma_addr,
433 dbuf->dma_size, DMA_FROM_DEVICE);
434
435 /* Reprogram the channel */
436 chan_writel(chan, HSU_CH_D0SAR, dbuf->dma_addr);
437 chan_writel(chan, HSU_CH_D0TSR, dbuf->dma_size);
438 chan_writel(chan, HSU_CH_DCR, 0x1
439 | (0x1 << 8)
440 | (0x1 << 16)
441 | (0x1 << 24) /* timeout bit, see HSU Errata 1 */
442 );
443 tty_flip_buffer_push(tty);
444
445 chan_writel(chan, HSU_CH_CR, 0x3);
446
447 }
448
449 static void serial_hsu_stop_rx(struct uart_port *port)
450 {
451 struct uart_hsu_port *up =
452 container_of(port, struct uart_hsu_port, port);
453 struct hsu_dma_chan *chan = up->rxc;
454
455 if (up->use_dma)
456 chan_writel(chan, HSU_CH_CR, 0x2);
457 else {
458 up->ier &= ~UART_IER_RLSI;
459 up->port.read_status_mask &= ~UART_LSR_DR;
460 serial_out(up, UART_IER, up->ier);
461 }
462 }
463
464 static inline void receive_chars(struct uart_hsu_port *up, int *status)
465 {
466 struct tty_struct *tty = up->port.state->port.tty;
467 unsigned int ch, flag;
468 unsigned int max_count = 256;
469
470 if (!tty)
471 return;
472
473 do {
474 ch = serial_in(up, UART_RX);
475 flag = TTY_NORMAL;
476 up->port.icount.rx++;
477
478 if (unlikely(*status & (UART_LSR_BI | UART_LSR_PE |
479 UART_LSR_FE | UART_LSR_OE))) {
480
481 dev_warn(up->dev, "We really rush into ERR/BI case"
482 "status = 0x%02x", *status);
483 /* For statistics only */
484 if (*status & UART_LSR_BI) {
485 *status &= ~(UART_LSR_FE | UART_LSR_PE);
486 up->port.icount.brk++;
487 /*
488 * We do the SysRQ and SAK checking
489 * here because otherwise the break
490 * may get masked by ignore_status_mask
491 * or read_status_mask.
492 */
493 if (uart_handle_break(&up->port))
494 goto ignore_char;
495 } else if (*status & UART_LSR_PE)
496 up->port.icount.parity++;
497 else if (*status & UART_LSR_FE)
498 up->port.icount.frame++;
499 if (*status & UART_LSR_OE)
500 up->port.icount.overrun++;
501
502 /* Mask off conditions which should be ignored. */
503 *status &= up->port.read_status_mask;
504
505 #ifdef CONFIG_SERIAL_MFD_HSU_CONSOLE
506 if (up->port.cons &&
507 up->port.cons->index == up->port.line) {
508 /* Recover the break flag from console xmit */
509 *status |= up->lsr_break_flag;
510 up->lsr_break_flag = 0;
511 }
512 #endif
513 if (*status & UART_LSR_BI) {
514 flag = TTY_BREAK;
515 } else if (*status & UART_LSR_PE)
516 flag = TTY_PARITY;
517 else if (*status & UART_LSR_FE)
518 flag = TTY_FRAME;
519 }
520
521 if (uart_handle_sysrq_char(&up->port, ch))
522 goto ignore_char;
523
524 uart_insert_char(&up->port, *status, UART_LSR_OE, ch, flag);
525 ignore_char:
526 *status = serial_in(up, UART_LSR);
527 } while ((*status & UART_LSR_DR) && max_count--);
528 tty_flip_buffer_push(tty);
529 }
530
531 static void transmit_chars(struct uart_hsu_port *up)
532 {
533 struct circ_buf *xmit = &up->port.state->xmit;
534 int count;
535
536 if (up->port.x_char) {
537 serial_out(up, UART_TX, up->port.x_char);
538 up->port.icount.tx++;
539 up->port.x_char = 0;
540 return;
541 }
542 if (uart_circ_empty(xmit) || uart_tx_stopped(&up->port)) {
543 serial_hsu_stop_tx(&up->port);
544 return;
545 }
546
547 /* The IRQ is for TX FIFO half-empty */
548 count = up->port.fifosize / 2;
549
550 do {
551 serial_out(up, UART_TX, xmit->buf[xmit->tail]);
552 xmit->tail = (xmit->tail + 1) & (UART_XMIT_SIZE - 1);
553
554 up->port.icount.tx++;
555 if (uart_circ_empty(xmit))
556 break;
557 } while (--count > 0);
558
559 if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS)
560 uart_write_wakeup(&up->port);
561
562 if (uart_circ_empty(xmit))
563 serial_hsu_stop_tx(&up->port);
564 }
565
566 static inline void check_modem_status(struct uart_hsu_port *up)
567 {
568 int status;
569
570 status = serial_in(up, UART_MSR);
571
572 if ((status & UART_MSR_ANY_DELTA) == 0)
573 return;
574
575 if (status & UART_MSR_TERI)
576 up->port.icount.rng++;
577 if (status & UART_MSR_DDSR)
578 up->port.icount.dsr++;
579 /* We may only get DDCD when HW init and reset */
580 if (status & UART_MSR_DDCD)
581 uart_handle_dcd_change(&up->port, status & UART_MSR_DCD);
582 /* Will start/stop_tx accordingly */
583 if (status & UART_MSR_DCTS)
584 uart_handle_cts_change(&up->port, status & UART_MSR_CTS);
585
586 wake_up_interruptible(&up->port.state->port.delta_msr_wait);
587 }
588
589 /*
590 * This handles the interrupt from one port.
591 */
592 static irqreturn_t port_irq(int irq, void *dev_id)
593 {
594 struct uart_hsu_port *up = dev_id;
595 unsigned int iir, lsr;
596 unsigned long flags;
597
598 if (unlikely(!up->running))
599 return IRQ_NONE;
600
601 spin_lock_irqsave(&up->port.lock, flags);
602 if (up->use_dma) {
603 lsr = serial_in(up, UART_LSR);
604 if (unlikely(lsr & (UART_LSR_BI | UART_LSR_PE |
605 UART_LSR_FE | UART_LSR_OE)))
606 dev_warn(up->dev,
607 "Got lsr irq while using DMA, lsr = 0x%2x\n",
608 lsr);
609 check_modem_status(up);
610 spin_unlock_irqrestore(&up->port.lock, flags);
611 return IRQ_HANDLED;
612 }
613
614 iir = serial_in(up, UART_IIR);
615 if (iir & UART_IIR_NO_INT) {
616 spin_unlock_irqrestore(&up->port.lock, flags);
617 return IRQ_NONE;
618 }
619
620 lsr = serial_in(up, UART_LSR);
621 if (lsr & UART_LSR_DR)
622 receive_chars(up, &lsr);
623 check_modem_status(up);
624
625 /* lsr will be renewed during the receive_chars */
626 if (lsr & UART_LSR_THRE)
627 transmit_chars(up);
628
629 spin_unlock_irqrestore(&up->port.lock, flags);
630 return IRQ_HANDLED;
631 }
632
633 static inline void dma_chan_irq(struct hsu_dma_chan *chan)
634 {
635 struct uart_hsu_port *up = chan->uport;
636 unsigned long flags;
637 u32 int_sts;
638
639 spin_lock_irqsave(&up->port.lock, flags);
640
641 if (!up->use_dma || !up->running)
642 goto exit;
643
644 /*
645 * No matter what situation, need read clear the IRQ status
646 * There is a bug, see Errata 5, HSD 2900918
647 */
648 int_sts = chan_readl(chan, HSU_CH_SR);
649
650 /* Rx channel */
651 if (chan->dirt == DMA_FROM_DEVICE)
652 hsu_dma_rx(up, int_sts);
653
654 /* Tx channel */
655 if (chan->dirt == DMA_TO_DEVICE) {
656 chan_writel(chan, HSU_CH_CR, 0x0);
657 up->dma_tx_on = 0;
658 hsu_dma_tx(up);
659 }
660
661 exit:
662 spin_unlock_irqrestore(&up->port.lock, flags);
663 return;
664 }
665
666 static irqreturn_t dma_irq(int irq, void *dev_id)
667 {
668 struct hsu_port *hsu = dev_id;
669 u32 int_sts, i;
670
671 int_sts = mfd_readl(hsu, HSU_GBL_DMAISR);
672
673 /* Currently we only have 6 channels may be used */
674 for (i = 0; i < 6; i++) {
675 if (int_sts & 0x1)
676 dma_chan_irq(&hsu->chans[i]);
677 int_sts >>= 1;
678 }
679
680 return IRQ_HANDLED;
681 }
682
683 static unsigned int serial_hsu_tx_empty(struct uart_port *port)
684 {
685 struct uart_hsu_port *up =
686 container_of(port, struct uart_hsu_port, port);
687 unsigned long flags;
688 unsigned int ret;
689
690 spin_lock_irqsave(&up->port.lock, flags);
691 ret = serial_in(up, UART_LSR) & UART_LSR_TEMT ? TIOCSER_TEMT : 0;
692 spin_unlock_irqrestore(&up->port.lock, flags);
693
694 return ret;
695 }
696
697 static unsigned int serial_hsu_get_mctrl(struct uart_port *port)
698 {
699 struct uart_hsu_port *up =
700 container_of(port, struct uart_hsu_port, port);
701 unsigned char status;
702 unsigned int ret;
703
704 status = serial_in(up, UART_MSR);
705
706 ret = 0;
707 if (status & UART_MSR_DCD)
708 ret |= TIOCM_CAR;
709 if (status & UART_MSR_RI)
710 ret |= TIOCM_RNG;
711 if (status & UART_MSR_DSR)
712 ret |= TIOCM_DSR;
713 if (status & UART_MSR_CTS)
714 ret |= TIOCM_CTS;
715 return ret;
716 }
717
718 static void serial_hsu_set_mctrl(struct uart_port *port, unsigned int mctrl)
719 {
720 struct uart_hsu_port *up =
721 container_of(port, struct uart_hsu_port, port);
722 unsigned char mcr = 0;
723
724 if (mctrl & TIOCM_RTS)
725 mcr |= UART_MCR_RTS;
726 if (mctrl & TIOCM_DTR)
727 mcr |= UART_MCR_DTR;
728 if (mctrl & TIOCM_OUT1)
729 mcr |= UART_MCR_OUT1;
730 if (mctrl & TIOCM_OUT2)
731 mcr |= UART_MCR_OUT2;
732 if (mctrl & TIOCM_LOOP)
733 mcr |= UART_MCR_LOOP;
734
735 mcr |= up->mcr;
736
737 serial_out(up, UART_MCR, mcr);
738 }
739
740 static void serial_hsu_break_ctl(struct uart_port *port, int break_state)
741 {
742 struct uart_hsu_port *up =
743 container_of(port, struct uart_hsu_port, port);
744 unsigned long flags;
745
746 spin_lock_irqsave(&up->port.lock, flags);
747 if (break_state == -1)
748 up->lcr |= UART_LCR_SBC;
749 else
750 up->lcr &= ~UART_LCR_SBC;
751 serial_out(up, UART_LCR, up->lcr);
752 spin_unlock_irqrestore(&up->port.lock, flags);
753 }
754
755 /*
756 * What special to do:
757 * 1. chose the 64B fifo mode
758 * 2. start dma or pio depends on configuration
759 * 3. we only allocate dma memory when needed
760 */
761 static int serial_hsu_startup(struct uart_port *port)
762 {
763 struct uart_hsu_port *up =
764 container_of(port, struct uart_hsu_port, port);
765 unsigned long flags;
766
767 /*
768 * Clear the FIFO buffers and disable them.
769 * (they will be reenabled in set_termios())
770 */
771 serial_out(up, UART_FCR, UART_FCR_ENABLE_FIFO);
772 serial_out(up, UART_FCR, UART_FCR_ENABLE_FIFO |
773 UART_FCR_CLEAR_RCVR | UART_FCR_CLEAR_XMIT);
774 serial_out(up, UART_FCR, 0);
775
776 /* Clear the interrupt registers. */
777 (void) serial_in(up, UART_LSR);
778 (void) serial_in(up, UART_RX);
779 (void) serial_in(up, UART_IIR);
780 (void) serial_in(up, UART_MSR);
781
782 /* Now, initialize the UART, default is 8n1 */
783 serial_out(up, UART_LCR, UART_LCR_WLEN8);
784
785 spin_lock_irqsave(&up->port.lock, flags);
786
787 up->port.mctrl |= TIOCM_OUT2;
788 serial_hsu_set_mctrl(&up->port, up->port.mctrl);
789
790 /*
791 * Finally, enable interrupts. Note: Modem status interrupts
792 * are set via set_termios(), which will be occurring imminently
793 * anyway, so we don't enable them here.
794 */
795 if (!up->use_dma)
796 up->ier = UART_IER_RLSI | UART_IER_RDI | UART_IER_RTOIE;
797 else
798 up->ier = 0;
799 serial_out(up, UART_IER, up->ier);
800
801 spin_unlock_irqrestore(&up->port.lock, flags);
802
803 /* DMA init */
804 if (up->use_dma) {
805 struct hsu_dma_buffer *dbuf;
806 struct circ_buf *xmit = &port->state->xmit;
807
808 up->dma_tx_on = 0;
809
810 /* First allocate the RX buffer */
811 dbuf = &up->rxbuf;
812 dbuf->buf = kzalloc(HSU_DMA_BUF_SIZE, GFP_KERNEL);
813 if (!dbuf->buf) {
814 up->use_dma = 0;
815 goto exit;
816 }
817 dbuf->dma_addr = dma_map_single(port->dev,
818 dbuf->buf,
819 HSU_DMA_BUF_SIZE,
820 DMA_FROM_DEVICE);
821 dbuf->dma_size = HSU_DMA_BUF_SIZE;
822
823 /* Start the RX channel right now */
824 hsu_dma_start_rx_chan(up->rxc, dbuf);
825
826 /* Next init the TX DMA */
827 dbuf = &up->txbuf;
828 dbuf->buf = xmit->buf;
829 dbuf->dma_addr = dma_map_single(port->dev,
830 dbuf->buf,
831 UART_XMIT_SIZE,
832 DMA_TO_DEVICE);
833 dbuf->dma_size = UART_XMIT_SIZE;
834
835 /* This should not be changed all around */
836 chan_writel(up->txc, HSU_CH_BSR, 32);
837 chan_writel(up->txc, HSU_CH_MOTSR, 4);
838 dbuf->ofs = 0;
839 }
840
841 exit:
842 /* And clear the interrupt registers again for luck. */
843 (void) serial_in(up, UART_LSR);
844 (void) serial_in(up, UART_RX);
845 (void) serial_in(up, UART_IIR);
846 (void) serial_in(up, UART_MSR);
847
848 up->running = 1;
849 return 0;
850 }
851
852 static void serial_hsu_shutdown(struct uart_port *port)
853 {
854 struct uart_hsu_port *up =
855 container_of(port, struct uart_hsu_port, port);
856 unsigned long flags;
857
858 /* Disable interrupts from this port */
859 up->ier = 0;
860 serial_out(up, UART_IER, 0);
861 up->running = 0;
862
863 spin_lock_irqsave(&up->port.lock, flags);
864 up->port.mctrl &= ~TIOCM_OUT2;
865 serial_hsu_set_mctrl(&up->port, up->port.mctrl);
866 spin_unlock_irqrestore(&up->port.lock, flags);
867
868 /* Disable break condition and FIFOs */
869 serial_out(up, UART_LCR, serial_in(up, UART_LCR) & ~UART_LCR_SBC);
870 serial_out(up, UART_FCR, UART_FCR_ENABLE_FIFO |
871 UART_FCR_CLEAR_RCVR |
872 UART_FCR_CLEAR_XMIT);
873 serial_out(up, UART_FCR, 0);
874 }
875
876 static void
877 serial_hsu_set_termios(struct uart_port *port, struct ktermios *termios,
878 struct ktermios *old)
879 {
880 struct uart_hsu_port *up =
881 container_of(port, struct uart_hsu_port, port);
882 struct tty_struct *tty = port->state->port.tty;
883 unsigned char cval, fcr = 0;
884 unsigned long flags;
885 unsigned int baud, quot;
886 u32 ps, mul;
887
888 switch (termios->c_cflag & CSIZE) {
889 case CS5:
890 cval = UART_LCR_WLEN5;
891 break;
892 case CS6:
893 cval = UART_LCR_WLEN6;
894 break;
895 case CS7:
896 cval = UART_LCR_WLEN7;
897 break;
898 default:
899 case CS8:
900 cval = UART_LCR_WLEN8;
901 break;
902 }
903
904 /* CMSPAR isn't supported by this driver */
905 if (tty)
906 tty->termios->c_cflag &= ~CMSPAR;
907
908 if (termios->c_cflag & CSTOPB)
909 cval |= UART_LCR_STOP;
910 if (termios->c_cflag & PARENB)
911 cval |= UART_LCR_PARITY;
912 if (!(termios->c_cflag & PARODD))
913 cval |= UART_LCR_EPAR;
914
915 /*
916 * The base clk is 50Mhz, and the baud rate come from:
917 * baud = 50M * MUL / (DIV * PS * DLAB)
918 *
919 * For those basic low baud rate we can get the direct
920 * scalar from 2746800, like 115200 = 2746800/24. For those
921 * higher baud rate, we handle them case by case, mainly by
922 * adjusting the MUL/PS registers, and DIV register is kept
923 * as default value 0x3d09 to make things simple
924 */
925 baud = uart_get_baud_rate(port, termios, old, 0, 4000000);
926
927 quot = 1;
928 ps = 0x10;
929 mul = 0x3600;
930 switch (baud) {
931 case 3500000:
932 mul = 0x3345;
933 ps = 0xC;
934 break;
935 case 1843200:
936 mul = 0x2400;
937 break;
938 case 3000000:
939 case 2500000:
940 case 2000000:
941 case 1500000:
942 case 1000000:
943 case 500000:
944 /* mul/ps/quot = 0x9C4/0x10/0x1 will make a 500000 bps */
945 mul = baud / 500000 * 0x9C4;
946 break;
947 default:
948 /* Use uart_get_divisor to get quot for other baud rates */
949 quot = 0;
950 }
951
952 if (!quot)
953 quot = uart_get_divisor(port, baud);
954
955 if ((up->port.uartclk / quot) < (2400 * 16))
956 fcr = UART_FCR_ENABLE_FIFO | UART_FCR_HSU_64_1B;
957 else if ((up->port.uartclk / quot) < (230400 * 16))
958 fcr = UART_FCR_ENABLE_FIFO | UART_FCR_HSU_64_16B;
959 else
960 fcr = UART_FCR_ENABLE_FIFO | UART_FCR_HSU_64_32B;
961
962 fcr |= UART_FCR_HSU_64B_FIFO;
963
964 /*
965 * Ok, we're now changing the port state. Do it with
966 * interrupts disabled.
967 */
968 spin_lock_irqsave(&up->port.lock, flags);
969
970 /* Update the per-port timeout */
971 uart_update_timeout(port, termios->c_cflag, baud);
972
973 up->port.read_status_mask = UART_LSR_OE | UART_LSR_THRE | UART_LSR_DR;
974 if (termios->c_iflag & INPCK)
975 up->port.read_status_mask |= UART_LSR_FE | UART_LSR_PE;
976 if (termios->c_iflag & (BRKINT | PARMRK))
977 up->port.read_status_mask |= UART_LSR_BI;
978
979 /* Characters to ignore */
980 up->port.ignore_status_mask = 0;
981 if (termios->c_iflag & IGNPAR)
982 up->port.ignore_status_mask |= UART_LSR_PE | UART_LSR_FE;
983 if (termios->c_iflag & IGNBRK) {
984 up->port.ignore_status_mask |= UART_LSR_BI;
985 /*
986 * If we're ignoring parity and break indicators,
987 * ignore overruns too (for real raw support).
988 */
989 if (termios->c_iflag & IGNPAR)
990 up->port.ignore_status_mask |= UART_LSR_OE;
991 }
992
993 /* Ignore all characters if CREAD is not set */
994 if ((termios->c_cflag & CREAD) == 0)
995 up->port.ignore_status_mask |= UART_LSR_DR;
996
997 /*
998 * CTS flow control flag and modem status interrupts, disable
999 * MSI by default
1000 */
1001 up->ier &= ~UART_IER_MSI;
1002 if (UART_ENABLE_MS(&up->port, termios->c_cflag))
1003 up->ier |= UART_IER_MSI;
1004
1005 serial_out(up, UART_IER, up->ier);
1006
1007 if (termios->c_cflag & CRTSCTS)
1008 up->mcr |= UART_MCR_AFE | UART_MCR_RTS;
1009 else
1010 up->mcr &= ~UART_MCR_AFE;
1011
1012 serial_out(up, UART_LCR, cval | UART_LCR_DLAB); /* set DLAB */
1013 serial_out(up, UART_DLL, quot & 0xff); /* LS of divisor */
1014 serial_out(up, UART_DLM, quot >> 8); /* MS of divisor */
1015 serial_out(up, UART_LCR, cval); /* reset DLAB */
1016 serial_out(up, UART_MUL, mul); /* set MUL */
1017 serial_out(up, UART_PS, ps); /* set PS */
1018 up->lcr = cval; /* Save LCR */
1019 serial_hsu_set_mctrl(&up->port, up->port.mctrl);
1020 serial_out(up, UART_FCR, fcr);
1021 spin_unlock_irqrestore(&up->port.lock, flags);
1022 }
1023
1024 static void
1025 serial_hsu_pm(struct uart_port *port, unsigned int state,
1026 unsigned int oldstate)
1027 {
1028 }
1029
1030 static void serial_hsu_release_port(struct uart_port *port)
1031 {
1032 }
1033
1034 static int serial_hsu_request_port(struct uart_port *port)
1035 {
1036 return 0;
1037 }
1038
1039 static void serial_hsu_config_port(struct uart_port *port, int flags)
1040 {
1041 struct uart_hsu_port *up =
1042 container_of(port, struct uart_hsu_port, port);
1043 up->port.type = PORT_MFD;
1044 }
1045
1046 static int
1047 serial_hsu_verify_port(struct uart_port *port, struct serial_struct *ser)
1048 {
1049 /* We don't want the core code to modify any port params */
1050 return -EINVAL;
1051 }
1052
1053 static const char *
1054 serial_hsu_type(struct uart_port *port)
1055 {
1056 struct uart_hsu_port *up =
1057 container_of(port, struct uart_hsu_port, port);
1058 return up->name;
1059 }
1060
1061 /* Mainly for uart console use */
1062 static struct uart_hsu_port *serial_hsu_ports[3];
1063 static struct uart_driver serial_hsu_reg;
1064
1065 #ifdef CONFIG_SERIAL_MFD_HSU_CONSOLE
1066
1067 #define BOTH_EMPTY (UART_LSR_TEMT | UART_LSR_THRE)
1068
1069 /* Wait for transmitter & holding register to empty */
1070 static inline void wait_for_xmitr(struct uart_hsu_port *up)
1071 {
1072 unsigned int status, tmout = 1000;
1073
1074 /* Wait up to 1ms for the character to be sent. */
1075 do {
1076 status = serial_in(up, UART_LSR);
1077
1078 if (status & UART_LSR_BI)
1079 up->lsr_break_flag = UART_LSR_BI;
1080
1081 if (--tmout == 0)
1082 break;
1083 udelay(1);
1084 } while (!(status & BOTH_EMPTY));
1085
1086 /* Wait up to 1s for flow control if necessary */
1087 if (up->port.flags & UPF_CONS_FLOW) {
1088 tmout = 1000000;
1089 while (--tmout &&
1090 ((serial_in(up, UART_MSR) & UART_MSR_CTS) == 0))
1091 udelay(1);
1092 }
1093 }
1094
1095 static void serial_hsu_console_putchar(struct uart_port *port, int ch)
1096 {
1097 struct uart_hsu_port *up =
1098 container_of(port, struct uart_hsu_port, port);
1099
1100 wait_for_xmitr(up);
1101 serial_out(up, UART_TX, ch);
1102 }
1103
1104 /*
1105 * Print a string to the serial port trying not to disturb
1106 * any possible real use of the port...
1107 *
1108 * The console_lock must be held when we get here.
1109 */
1110 static void
1111 serial_hsu_console_write(struct console *co, const char *s, unsigned int count)
1112 {
1113 struct uart_hsu_port *up = serial_hsu_ports[co->index];
1114 unsigned long flags;
1115 unsigned int ier;
1116 int locked = 1;
1117
1118 local_irq_save(flags);
1119 if (up->port.sysrq)
1120 locked = 0;
1121 else if (oops_in_progress) {
1122 locked = spin_trylock(&up->port.lock);
1123 } else
1124 spin_lock(&up->port.lock);
1125
1126 /* First save the IER then disable the interrupts */
1127 ier = serial_in(up, UART_IER);
1128 serial_out(up, UART_IER, 0);
1129
1130 uart_console_write(&up->port, s, count, serial_hsu_console_putchar);
1131
1132 /*
1133 * Finally, wait for transmitter to become empty
1134 * and restore the IER
1135 */
1136 wait_for_xmitr(up);
1137 serial_out(up, UART_IER, ier);
1138
1139 if (locked)
1140 spin_unlock(&up->port.lock);
1141 local_irq_restore(flags);
1142 }
1143
1144 static struct console serial_hsu_console;
1145
1146 static int __init
1147 serial_hsu_console_setup(struct console *co, char *options)
1148 {
1149 struct uart_hsu_port *up;
1150 int baud = 115200;
1151 int bits = 8;
1152 int parity = 'n';
1153 int flow = 'n';
1154 int ret;
1155
1156 if (co->index == -1 || co->index >= serial_hsu_reg.nr)
1157 co->index = 0;
1158 up = serial_hsu_ports[co->index];
1159 if (!up)
1160 return -ENODEV;
1161
1162 if (options)
1163 uart_parse_options(options, &baud, &parity, &bits, &flow);
1164
1165 ret = uart_set_options(&up->port, co, baud, parity, bits, flow);
1166
1167 return ret;
1168 }
1169
1170 static struct console serial_hsu_console = {
1171 .name = "ttyMFD",
1172 .write = serial_hsu_console_write,
1173 .device = uart_console_device,
1174 .setup = serial_hsu_console_setup,
1175 .flags = CON_PRINTBUFFER,
1176 .index = 2,
1177 .data = &serial_hsu_reg,
1178 };
1179 #endif
1180
1181 struct uart_ops serial_hsu_pops = {
1182 .tx_empty = serial_hsu_tx_empty,
1183 .set_mctrl = serial_hsu_set_mctrl,
1184 .get_mctrl = serial_hsu_get_mctrl,
1185 .stop_tx = serial_hsu_stop_tx,
1186 .start_tx = serial_hsu_start_tx,
1187 .stop_rx = serial_hsu_stop_rx,
1188 .enable_ms = serial_hsu_enable_ms,
1189 .break_ctl = serial_hsu_break_ctl,
1190 .startup = serial_hsu_startup,
1191 .shutdown = serial_hsu_shutdown,
1192 .set_termios = serial_hsu_set_termios,
1193 .pm = serial_hsu_pm,
1194 .type = serial_hsu_type,
1195 .release_port = serial_hsu_release_port,
1196 .request_port = serial_hsu_request_port,
1197 .config_port = serial_hsu_config_port,
1198 .verify_port = serial_hsu_verify_port,
1199 };
1200
1201 static struct uart_driver serial_hsu_reg = {
1202 .owner = THIS_MODULE,
1203 .driver_name = "MFD serial",
1204 .dev_name = "ttyMFD",
1205 .major = TTY_MAJOR,
1206 .minor = 128,
1207 .nr = 3,
1208 };
1209
1210 #ifdef CONFIG_PM
1211 static int serial_hsu_suspend(struct pci_dev *pdev, pm_message_t state)
1212 {
1213 void *priv = pci_get_drvdata(pdev);
1214 struct uart_hsu_port *up;
1215
1216 /* Make sure this is not the internal dma controller */
1217 if (priv && (pdev->device != 0x081E)) {
1218 up = priv;
1219 uart_suspend_port(&serial_hsu_reg, &up->port);
1220 }
1221
1222 pci_save_state(pdev);
1223 pci_set_power_state(pdev, pci_choose_state(pdev, state));
1224 return 0;
1225 }
1226
1227 static int serial_hsu_resume(struct pci_dev *pdev)
1228 {
1229 void *priv = pci_get_drvdata(pdev);
1230 struct uart_hsu_port *up;
1231 int ret;
1232
1233 pci_set_power_state(pdev, PCI_D0);
1234 pci_restore_state(pdev);
1235
1236 ret = pci_enable_device(pdev);
1237 if (ret)
1238 dev_warn(&pdev->dev,
1239 "HSU: can't re-enable device, try to continue\n");
1240
1241 if (priv && (pdev->device != 0x081E)) {
1242 up = priv;
1243 uart_resume_port(&serial_hsu_reg, &up->port);
1244 }
1245 return 0;
1246 }
1247 #else
1248 #define serial_hsu_suspend NULL
1249 #define serial_hsu_resume NULL
1250 #endif
1251
1252 /* temp global pointer before we settle down on using one or four PCI dev */
1253 static struct hsu_port *phsu;
1254
1255 static int serial_hsu_probe(struct pci_dev *pdev,
1256 const struct pci_device_id *ent)
1257 {
1258 struct uart_hsu_port *uport;
1259 int index, ret;
1260
1261 printk(KERN_INFO "HSU: found PCI Serial controller(ID: %04x:%04x)\n",
1262 pdev->vendor, pdev->device);
1263
1264 switch (pdev->device) {
1265 case 0x081B:
1266 index = 0;
1267 break;
1268 case 0x081C:
1269 index = 1;
1270 break;
1271 case 0x081D:
1272 index = 2;
1273 break;
1274 case 0x081E:
1275 /* internal DMA controller */
1276 index = 3;
1277 break;
1278 default:
1279 dev_err(&pdev->dev, "HSU: out of index!");
1280 return -ENODEV;
1281 }
1282
1283 ret = pci_enable_device(pdev);
1284 if (ret)
1285 return ret;
1286
1287 if (index == 3) {
1288 /* DMA controller */
1289 ret = request_irq(pdev->irq, dma_irq, 0, "hsu_dma", phsu);
1290 if (ret) {
1291 dev_err(&pdev->dev, "can not get IRQ\n");
1292 goto err_disable;
1293 }
1294 pci_set_drvdata(pdev, phsu);
1295 } else {
1296 /* UART port 0~2 */
1297 uport = &phsu->port[index];
1298 uport->port.irq = pdev->irq;
1299 uport->port.dev = &pdev->dev;
1300 uport->dev = &pdev->dev;
1301
1302 ret = request_irq(pdev->irq, port_irq, 0, uport->name, uport);
1303 if (ret) {
1304 dev_err(&pdev->dev, "can not get IRQ\n");
1305 goto err_disable;
1306 }
1307 uart_add_one_port(&serial_hsu_reg, &uport->port);
1308
1309 #ifdef CONFIG_SERIAL_MFD_HSU_CONSOLE
1310 if (index == 2) {
1311 register_console(&serial_hsu_console);
1312 uport->port.cons = &serial_hsu_console;
1313 }
1314 #endif
1315 pci_set_drvdata(pdev, uport);
1316 }
1317
1318 return 0;
1319
1320 err_disable:
1321 pci_disable_device(pdev);
1322 return ret;
1323 }
1324
1325 static void hsu_global_init(void)
1326 {
1327 struct hsu_port *hsu;
1328 struct uart_hsu_port *uport;
1329 struct hsu_dma_chan *dchan;
1330 int i, ret;
1331
1332 hsu = kzalloc(sizeof(struct hsu_port), GFP_KERNEL);
1333 if (!hsu)
1334 return;
1335
1336 /* Get basic io resource and map it */
1337 hsu->paddr = 0xffa28000;
1338 hsu->iolen = 0x1000;
1339
1340 if (!(request_mem_region(hsu->paddr, hsu->iolen, "HSU global")))
1341 pr_warning("HSU: error in request mem region\n");
1342
1343 hsu->reg = ioremap_nocache((unsigned long)hsu->paddr, hsu->iolen);
1344 if (!hsu->reg) {
1345 pr_err("HSU: error in ioremap\n");
1346 ret = -ENOMEM;
1347 goto err_free_region;
1348 }
1349
1350 /* Initialise the 3 UART ports */
1351 uport = hsu->port;
1352 for (i = 0; i < 3; i++) {
1353 uport->port.type = PORT_MFD;
1354 uport->port.iotype = UPIO_MEM;
1355 uport->port.mapbase = (resource_size_t)hsu->paddr
1356 + HSU_PORT_REG_OFFSET
1357 + i * HSU_PORT_REG_LENGTH;
1358 uport->port.membase = hsu->reg + HSU_PORT_REG_OFFSET
1359 + i * HSU_PORT_REG_LENGTH;
1360
1361 sprintf(uport->name, "hsu_port%d", i);
1362 uport->port.fifosize = 64;
1363 uport->port.ops = &serial_hsu_pops;
1364 uport->port.line = i;
1365 uport->port.flags = UPF_IOREMAP;
1366 /* set the scalable maxim support rate to 2746800 bps */
1367 uport->port.uartclk = 115200 * 24 * 16;
1368
1369 uport->running = 0;
1370 uport->txc = &hsu->chans[i * 2];
1371 uport->rxc = &hsu->chans[i * 2 + 1];
1372
1373 serial_hsu_ports[i] = uport;
1374 uport->index = i;
1375
1376 if (hsu_dma_enable & (1<<i))
1377 uport->use_dma = 1;
1378 else
1379 uport->use_dma = 0;
1380
1381 uport++;
1382 }
1383
1384 /* Initialise 6 dma channels */
1385 dchan = hsu->chans;
1386 for (i = 0; i < 6; i++) {
1387 dchan->id = i;
1388 dchan->dirt = (i & 0x1) ? DMA_FROM_DEVICE : DMA_TO_DEVICE;
1389 dchan->uport = &hsu->port[i/2];
1390 dchan->reg = hsu->reg + HSU_DMA_CHANS_REG_OFFSET +
1391 i * HSU_DMA_CHANS_REG_LENGTH;
1392
1393 dchan++;
1394 }
1395
1396 phsu = hsu;
1397 hsu_debugfs_init(hsu);
1398 return;
1399
1400 err_free_region:
1401 release_mem_region(hsu->paddr, hsu->iolen);
1402 kfree(hsu);
1403 return;
1404 }
1405
1406 static void serial_hsu_remove(struct pci_dev *pdev)
1407 {
1408 void *priv = pci_get_drvdata(pdev);
1409 struct uart_hsu_port *up;
1410
1411 if (!priv)
1412 return;
1413
1414 /* For port 0/1/2, priv is the address of uart_hsu_port */
1415 if (pdev->device != 0x081E) {
1416 up = priv;
1417 uart_remove_one_port(&serial_hsu_reg, &up->port);
1418 }
1419
1420 pci_set_drvdata(pdev, NULL);
1421 free_irq(pdev->irq, priv);
1422 pci_disable_device(pdev);
1423 }
1424
1425 /* First 3 are UART ports, and the 4th is the DMA */
1426 static const struct pci_device_id pci_ids[] __devinitdata = {
1427 { PCI_DEVICE(PCI_VENDOR_ID_INTEL, 0x081B) },
1428 { PCI_DEVICE(PCI_VENDOR_ID_INTEL, 0x081C) },
1429 { PCI_DEVICE(PCI_VENDOR_ID_INTEL, 0x081D) },
1430 { PCI_DEVICE(PCI_VENDOR_ID_INTEL, 0x081E) },
1431 {},
1432 };
1433
1434 static struct pci_driver hsu_pci_driver = {
1435 .name = "HSU serial",
1436 .id_table = pci_ids,
1437 .probe = serial_hsu_probe,
1438 .remove = __devexit_p(serial_hsu_remove),
1439 .suspend = serial_hsu_suspend,
1440 .resume = serial_hsu_resume,
1441 };
1442
1443 static int __init hsu_pci_init(void)
1444 {
1445 int ret;
1446
1447 hsu_global_init();
1448
1449 ret = uart_register_driver(&serial_hsu_reg);
1450 if (ret)
1451 return ret;
1452
1453 return pci_register_driver(&hsu_pci_driver);
1454 }
1455
1456 static void __exit hsu_pci_exit(void)
1457 {
1458 pci_unregister_driver(&hsu_pci_driver);
1459 uart_unregister_driver(&serial_hsu_reg);
1460
1461 hsu_debugfs_remove(phsu);
1462
1463 kfree(phsu);
1464 }
1465
1466 module_init(hsu_pci_init);
1467 module_exit(hsu_pci_exit);
1468
1469 MODULE_LICENSE("GPL v2");
1470 MODULE_ALIAS("platform:medfield-hsu");
Linux 2.6 ibm-acpi/thinkpad-acpi driver git tree