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Merge branch 'drm-tda998x-devel' of git://git.armlinux.org.uk/~rmk/linux-arm into...
[deliverable/linux.git] / drivers / hsi / controllers / omap_ssi_port.c
1 /* OMAP SSI port driver.
2 *
3 * Copyright (C) 2010 Nokia Corporation. All rights reserved.
4 * Copyright (C) 2014 Sebastian Reichel <sre@kernel.org>
5 *
6 * Contact: Carlos Chinea <carlos.chinea@nokia.com>
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 * version 2 as published by the Free Software Foundation.
11 *
12 * This program is distributed in the hope that it will be useful, but
13 * WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15 * General Public License for more details.
16 *
17 * You should have received a copy of the GNU General Public License
18 * along with this program; if not, write to the Free Software
19 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
20 * 02110-1301 USA
21 */
22
23 #include <linux/platform_device.h>
24 #include <linux/dma-mapping.h>
25 #include <linux/pm_runtime.h>
26 #include <linux/delay.h>
27
28 #include <linux/gpio/consumer.h>
29 #include <linux/pinctrl/consumer.h>
30 #include <linux/debugfs.h>
31
32 #include "omap_ssi_regs.h"
33 #include "omap_ssi.h"
34
35 static inline int hsi_dummy_msg(struct hsi_msg *msg __maybe_unused)
36 {
37 return 0;
38 }
39
40 static inline int hsi_dummy_cl(struct hsi_client *cl __maybe_unused)
41 {
42 return 0;
43 }
44
45 static inline unsigned int ssi_wakein(struct hsi_port *port)
46 {
47 struct omap_ssi_port *omap_port = hsi_port_drvdata(port);
48 return gpiod_get_value(omap_port->wake_gpio);
49 }
50
51 #ifdef CONFIG_DEBUG_FS
52 static void ssi_debug_remove_port(struct hsi_port *port)
53 {
54 struct omap_ssi_port *omap_port = hsi_port_drvdata(port);
55
56 debugfs_remove_recursive(omap_port->dir);
57 }
58
59 static int ssi_debug_port_show(struct seq_file *m, void *p __maybe_unused)
60 {
61 struct hsi_port *port = m->private;
62 struct omap_ssi_port *omap_port = hsi_port_drvdata(port);
63 struct hsi_controller *ssi = to_hsi_controller(port->device.parent);
64 struct omap_ssi_controller *omap_ssi = hsi_controller_drvdata(ssi);
65 void __iomem *base = omap_ssi->sys;
66 unsigned int ch;
67
68 pm_runtime_get_sync(omap_port->pdev);
69 if (omap_port->wake_irq > 0)
70 seq_printf(m, "CAWAKE\t\t: %d\n", ssi_wakein(port));
71 seq_printf(m, "WAKE\t\t: 0x%08x\n",
72 readl(base + SSI_WAKE_REG(port->num)));
73 seq_printf(m, "MPU_ENABLE_IRQ%d\t: 0x%08x\n", 0,
74 readl(base + SSI_MPU_ENABLE_REG(port->num, 0)));
75 seq_printf(m, "MPU_STATUS_IRQ%d\t: 0x%08x\n", 0,
76 readl(base + SSI_MPU_STATUS_REG(port->num, 0)));
77 /* SST */
78 base = omap_port->sst_base;
79 seq_puts(m, "\nSST\n===\n");
80 seq_printf(m, "ID SST\t\t: 0x%08x\n",
81 readl(base + SSI_SST_ID_REG));
82 seq_printf(m, "MODE\t\t: 0x%08x\n",
83 readl(base + SSI_SST_MODE_REG));
84 seq_printf(m, "FRAMESIZE\t: 0x%08x\n",
85 readl(base + SSI_SST_FRAMESIZE_REG));
86 seq_printf(m, "DIVISOR\t\t: 0x%08x\n",
87 readl(base + SSI_SST_DIVISOR_REG));
88 seq_printf(m, "CHANNELS\t: 0x%08x\n",
89 readl(base + SSI_SST_CHANNELS_REG));
90 seq_printf(m, "ARBMODE\t\t: 0x%08x\n",
91 readl(base + SSI_SST_ARBMODE_REG));
92 seq_printf(m, "TXSTATE\t\t: 0x%08x\n",
93 readl(base + SSI_SST_TXSTATE_REG));
94 seq_printf(m, "BUFSTATE\t: 0x%08x\n",
95 readl(base + SSI_SST_BUFSTATE_REG));
96 seq_printf(m, "BREAK\t\t: 0x%08x\n",
97 readl(base + SSI_SST_BREAK_REG));
98 for (ch = 0; ch < omap_port->channels; ch++) {
99 seq_printf(m, "BUFFER_CH%d\t: 0x%08x\n", ch,
100 readl(base + SSI_SST_BUFFER_CH_REG(ch)));
101 }
102 /* SSR */
103 base = omap_port->ssr_base;
104 seq_puts(m, "\nSSR\n===\n");
105 seq_printf(m, "ID SSR\t\t: 0x%08x\n",
106 readl(base + SSI_SSR_ID_REG));
107 seq_printf(m, "MODE\t\t: 0x%08x\n",
108 readl(base + SSI_SSR_MODE_REG));
109 seq_printf(m, "FRAMESIZE\t: 0x%08x\n",
110 readl(base + SSI_SSR_FRAMESIZE_REG));
111 seq_printf(m, "CHANNELS\t: 0x%08x\n",
112 readl(base + SSI_SSR_CHANNELS_REG));
113 seq_printf(m, "TIMEOUT\t\t: 0x%08x\n",
114 readl(base + SSI_SSR_TIMEOUT_REG));
115 seq_printf(m, "RXSTATE\t\t: 0x%08x\n",
116 readl(base + SSI_SSR_RXSTATE_REG));
117 seq_printf(m, "BUFSTATE\t: 0x%08x\n",
118 readl(base + SSI_SSR_BUFSTATE_REG));
119 seq_printf(m, "BREAK\t\t: 0x%08x\n",
120 readl(base + SSI_SSR_BREAK_REG));
121 seq_printf(m, "ERROR\t\t: 0x%08x\n",
122 readl(base + SSI_SSR_ERROR_REG));
123 seq_printf(m, "ERRORACK\t: 0x%08x\n",
124 readl(base + SSI_SSR_ERRORACK_REG));
125 for (ch = 0; ch < omap_port->channels; ch++) {
126 seq_printf(m, "BUFFER_CH%d\t: 0x%08x\n", ch,
127 readl(base + SSI_SSR_BUFFER_CH_REG(ch)));
128 }
129 pm_runtime_put_autosuspend(omap_port->pdev);
130
131 return 0;
132 }
133
134 static int ssi_port_regs_open(struct inode *inode, struct file *file)
135 {
136 return single_open(file, ssi_debug_port_show, inode->i_private);
137 }
138
139 static const struct file_operations ssi_port_regs_fops = {
140 .open = ssi_port_regs_open,
141 .read = seq_read,
142 .llseek = seq_lseek,
143 .release = single_release,
144 };
145
146 static int ssi_div_get(void *data, u64 *val)
147 {
148 struct hsi_port *port = data;
149 struct omap_ssi_port *omap_port = hsi_port_drvdata(port);
150
151 pm_runtime_get_sync(omap_port->pdev);
152 *val = readl(omap_port->sst_base + SSI_SST_DIVISOR_REG);
153 pm_runtime_put_autosuspend(omap_port->pdev);
154
155 return 0;
156 }
157
158 static int ssi_div_set(void *data, u64 val)
159 {
160 struct hsi_port *port = data;
161 struct omap_ssi_port *omap_port = hsi_port_drvdata(port);
162
163 if (val > 127)
164 return -EINVAL;
165
166 pm_runtime_get_sync(omap_port->pdev);
167 writel(val, omap_port->sst_base + SSI_SST_DIVISOR_REG);
168 omap_port->sst.divisor = val;
169 pm_runtime_put_autosuspend(omap_port->pdev);
170
171 return 0;
172 }
173
174 DEFINE_SIMPLE_ATTRIBUTE(ssi_sst_div_fops, ssi_div_get, ssi_div_set, "%llu\n");
175
176 static int ssi_debug_add_port(struct omap_ssi_port *omap_port,
177 struct dentry *dir)
178 {
179 struct hsi_port *port = to_hsi_port(omap_port->dev);
180
181 dir = debugfs_create_dir(dev_name(omap_port->dev), dir);
182 if (!dir)
183 return -ENOMEM;
184 omap_port->dir = dir;
185 debugfs_create_file("regs", S_IRUGO, dir, port, &ssi_port_regs_fops);
186 dir = debugfs_create_dir("sst", dir);
187 if (!dir)
188 return -ENOMEM;
189 debugfs_create_file("divisor", S_IRUGO | S_IWUSR, dir, port,
190 &ssi_sst_div_fops);
191
192 return 0;
193 }
194 #endif
195
196 static void ssi_process_errqueue(struct work_struct *work)
197 {
198 struct omap_ssi_port *omap_port;
199 struct list_head *head, *tmp;
200 struct hsi_msg *msg;
201
202 omap_port = container_of(work, struct omap_ssi_port, errqueue_work.work);
203
204 list_for_each_safe(head, tmp, &omap_port->errqueue) {
205 msg = list_entry(head, struct hsi_msg, link);
206 msg->complete(msg);
207 list_del(head);
208 }
209 }
210
211 static int ssi_claim_lch(struct hsi_msg *msg)
212 {
213
214 struct hsi_port *port = hsi_get_port(msg->cl);
215 struct hsi_controller *ssi = to_hsi_controller(port->device.parent);
216 struct omap_ssi_controller *omap_ssi = hsi_controller_drvdata(ssi);
217 int lch;
218
219 for (lch = 0; lch < SSI_MAX_GDD_LCH; lch++)
220 if (!omap_ssi->gdd_trn[lch].msg) {
221 omap_ssi->gdd_trn[lch].msg = msg;
222 omap_ssi->gdd_trn[lch].sg = msg->sgt.sgl;
223 return lch;
224 }
225
226 return -EBUSY;
227 }
228
229 static int ssi_start_dma(struct hsi_msg *msg, int lch)
230 {
231 struct hsi_port *port = hsi_get_port(msg->cl);
232 struct omap_ssi_port *omap_port = hsi_port_drvdata(port);
233 struct hsi_controller *ssi = to_hsi_controller(port->device.parent);
234 struct omap_ssi_controller *omap_ssi = hsi_controller_drvdata(ssi);
235 void __iomem *gdd = omap_ssi->gdd;
236 int err;
237 u16 csdp;
238 u16 ccr;
239 u32 s_addr;
240 u32 d_addr;
241 u32 tmp;
242
243 /* Hold clocks during the transfer */
244 pm_runtime_get(omap_port->pdev);
245
246 if (!pm_runtime_active(omap_port->pdev)) {
247 dev_warn(&port->device, "ssi_start_dma called without runtime PM!\n");
248 pm_runtime_put_autosuspend(omap_port->pdev);
249 return -EREMOTEIO;
250 }
251
252 if (msg->ttype == HSI_MSG_READ) {
253 err = dma_map_sg(&ssi->device, msg->sgt.sgl, msg->sgt.nents,
254 DMA_FROM_DEVICE);
255 if (err < 0) {
256 dev_dbg(&ssi->device, "DMA map SG failed !\n");
257 pm_runtime_put_autosuspend(omap_port->pdev);
258 return err;
259 }
260 csdp = SSI_DST_BURST_4x32_BIT | SSI_DST_MEMORY_PORT |
261 SSI_SRC_SINGLE_ACCESS0 | SSI_SRC_PERIPHERAL_PORT |
262 SSI_DATA_TYPE_S32;
263 ccr = msg->channel + 0x10 + (port->num * 8); /* Sync */
264 ccr |= SSI_DST_AMODE_POSTINC | SSI_SRC_AMODE_CONST |
265 SSI_CCR_ENABLE;
266 s_addr = omap_port->ssr_dma +
267 SSI_SSR_BUFFER_CH_REG(msg->channel);
268 d_addr = sg_dma_address(msg->sgt.sgl);
269 } else {
270 err = dma_map_sg(&ssi->device, msg->sgt.sgl, msg->sgt.nents,
271 DMA_TO_DEVICE);
272 if (err < 0) {
273 dev_dbg(&ssi->device, "DMA map SG failed !\n");
274 pm_runtime_put_autosuspend(omap_port->pdev);
275 return err;
276 }
277 csdp = SSI_SRC_BURST_4x32_BIT | SSI_SRC_MEMORY_PORT |
278 SSI_DST_SINGLE_ACCESS0 | SSI_DST_PERIPHERAL_PORT |
279 SSI_DATA_TYPE_S32;
280 ccr = (msg->channel + 1 + (port->num * 8)) & 0xf; /* Sync */
281 ccr |= SSI_SRC_AMODE_POSTINC | SSI_DST_AMODE_CONST |
282 SSI_CCR_ENABLE;
283 s_addr = sg_dma_address(msg->sgt.sgl);
284 d_addr = omap_port->sst_dma +
285 SSI_SST_BUFFER_CH_REG(msg->channel);
286 }
287 dev_dbg(&ssi->device, "lch %d cdsp %08x ccr %04x s_addr %08x d_addr %08x\n",
288 lch, csdp, ccr, s_addr, d_addr);
289
290 writew_relaxed(csdp, gdd + SSI_GDD_CSDP_REG(lch));
291 writew_relaxed(SSI_BLOCK_IE | SSI_TOUT_IE, gdd + SSI_GDD_CICR_REG(lch));
292 writel_relaxed(d_addr, gdd + SSI_GDD_CDSA_REG(lch));
293 writel_relaxed(s_addr, gdd + SSI_GDD_CSSA_REG(lch));
294 writew_relaxed(SSI_BYTES_TO_FRAMES(msg->sgt.sgl->length),
295 gdd + SSI_GDD_CEN_REG(lch));
296
297 spin_lock_bh(&omap_ssi->lock);
298 tmp = readl(omap_ssi->sys + SSI_GDD_MPU_IRQ_ENABLE_REG);
299 tmp |= SSI_GDD_LCH(lch);
300 writel_relaxed(tmp, omap_ssi->sys + SSI_GDD_MPU_IRQ_ENABLE_REG);
301 spin_unlock_bh(&omap_ssi->lock);
302 writew(ccr, gdd + SSI_GDD_CCR_REG(lch));
303 msg->status = HSI_STATUS_PROCEEDING;
304
305 return 0;
306 }
307
308 static int ssi_start_pio(struct hsi_msg *msg)
309 {
310 struct hsi_port *port = hsi_get_port(msg->cl);
311 struct omap_ssi_port *omap_port = hsi_port_drvdata(port);
312 struct hsi_controller *ssi = to_hsi_controller(port->device.parent);
313 struct omap_ssi_controller *omap_ssi = hsi_controller_drvdata(ssi);
314 u32 val;
315
316 pm_runtime_get(omap_port->pdev);
317
318 if (!pm_runtime_active(omap_port->pdev)) {
319 dev_warn(&port->device, "ssi_start_pio called without runtime PM!\n");
320 pm_runtime_put_autosuspend(omap_port->pdev);
321 return -EREMOTEIO;
322 }
323
324 if (msg->ttype == HSI_MSG_WRITE) {
325 val = SSI_DATAACCEPT(msg->channel);
326 /* Hold clocks for pio writes */
327 pm_runtime_get(omap_port->pdev);
328 } else {
329 val = SSI_DATAAVAILABLE(msg->channel) | SSI_ERROROCCURED;
330 }
331 dev_dbg(&port->device, "Single %s transfer\n",
332 msg->ttype ? "write" : "read");
333 val |= readl(omap_ssi->sys + SSI_MPU_ENABLE_REG(port->num, 0));
334 writel(val, omap_ssi->sys + SSI_MPU_ENABLE_REG(port->num, 0));
335 pm_runtime_put_autosuspend(omap_port->pdev);
336 msg->actual_len = 0;
337 msg->status = HSI_STATUS_PROCEEDING;
338
339 return 0;
340 }
341
342 static int ssi_start_transfer(struct list_head *queue)
343 {
344 struct hsi_msg *msg;
345 int lch = -1;
346
347 if (list_empty(queue))
348 return 0;
349 msg = list_first_entry(queue, struct hsi_msg, link);
350 if (msg->status != HSI_STATUS_QUEUED)
351 return 0;
352 if ((msg->sgt.nents) && (msg->sgt.sgl->length > sizeof(u32)))
353 lch = ssi_claim_lch(msg);
354 if (lch >= 0)
355 return ssi_start_dma(msg, lch);
356 else
357 return ssi_start_pio(msg);
358 }
359
360 static int ssi_async_break(struct hsi_msg *msg)
361 {
362 struct hsi_port *port = hsi_get_port(msg->cl);
363 struct omap_ssi_port *omap_port = hsi_port_drvdata(port);
364 struct hsi_controller *ssi = to_hsi_controller(port->device.parent);
365 struct omap_ssi_controller *omap_ssi = hsi_controller_drvdata(ssi);
366 int err = 0;
367 u32 tmp;
368
369 pm_runtime_get_sync(omap_port->pdev);
370 if (msg->ttype == HSI_MSG_WRITE) {
371 if (omap_port->sst.mode != SSI_MODE_FRAME) {
372 err = -EINVAL;
373 goto out;
374 }
375 writel(1, omap_port->sst_base + SSI_SST_BREAK_REG);
376 msg->status = HSI_STATUS_COMPLETED;
377 msg->complete(msg);
378 } else {
379 if (omap_port->ssr.mode != SSI_MODE_FRAME) {
380 err = -EINVAL;
381 goto out;
382 }
383 spin_lock_bh(&omap_port->lock);
384 tmp = readl(omap_ssi->sys +
385 SSI_MPU_ENABLE_REG(port->num, 0));
386 writel(tmp | SSI_BREAKDETECTED,
387 omap_ssi->sys + SSI_MPU_ENABLE_REG(port->num, 0));
388 msg->status = HSI_STATUS_PROCEEDING;
389 list_add_tail(&msg->link, &omap_port->brkqueue);
390 spin_unlock_bh(&omap_port->lock);
391 }
392 out:
393 pm_runtime_mark_last_busy(omap_port->pdev);
394 pm_runtime_put_autosuspend(omap_port->pdev);
395
396 return err;
397 }
398
399 static int ssi_async(struct hsi_msg *msg)
400 {
401 struct hsi_port *port = hsi_get_port(msg->cl);
402 struct omap_ssi_port *omap_port = hsi_port_drvdata(port);
403 struct list_head *queue;
404 int err = 0;
405
406 BUG_ON(!msg);
407
408 if (msg->sgt.nents > 1)
409 return -ENOSYS; /* TODO: Add sg support */
410
411 if (msg->break_frame)
412 return ssi_async_break(msg);
413
414 if (msg->ttype) {
415 BUG_ON(msg->channel >= omap_port->sst.channels);
416 queue = &omap_port->txqueue[msg->channel];
417 } else {
418 BUG_ON(msg->channel >= omap_port->ssr.channels);
419 queue = &omap_port->rxqueue[msg->channel];
420 }
421 msg->status = HSI_STATUS_QUEUED;
422
423 pm_runtime_get_sync(omap_port->pdev);
424 spin_lock_bh(&omap_port->lock);
425 list_add_tail(&msg->link, queue);
426 err = ssi_start_transfer(queue);
427 if (err < 0) {
428 list_del(&msg->link);
429 msg->status = HSI_STATUS_ERROR;
430 }
431 spin_unlock_bh(&omap_port->lock);
432 pm_runtime_mark_last_busy(omap_port->pdev);
433 pm_runtime_put_autosuspend(omap_port->pdev);
434 dev_dbg(&port->device, "msg status %d ttype %d ch %d\n",
435 msg->status, msg->ttype, msg->channel);
436
437 return err;
438 }
439
440 static u32 ssi_calculate_div(struct hsi_controller *ssi)
441 {
442 struct omap_ssi_controller *omap_ssi = hsi_controller_drvdata(ssi);
443 u32 tx_fckrate = (u32) omap_ssi->fck_rate;
444
445 /* / 2 : SSI TX clock is always half of the SSI functional clock */
446 tx_fckrate >>= 1;
447 /* Round down when tx_fckrate % omap_ssi->max_speed == 0 */
448 tx_fckrate--;
449 dev_dbg(&ssi->device, "TX div %d for fck_rate %lu Khz speed %d Kb/s\n",
450 tx_fckrate / omap_ssi->max_speed, omap_ssi->fck_rate,
451 omap_ssi->max_speed);
452
453 return tx_fckrate / omap_ssi->max_speed;
454 }
455
456 static void ssi_flush_queue(struct list_head *queue, struct hsi_client *cl)
457 {
458 struct list_head *node, *tmp;
459 struct hsi_msg *msg;
460
461 list_for_each_safe(node, tmp, queue) {
462 msg = list_entry(node, struct hsi_msg, link);
463 if ((cl) && (cl != msg->cl))
464 continue;
465 list_del(node);
466 pr_debug("flush queue: ch %d, msg %p len %d type %d ctxt %p\n",
467 msg->channel, msg, msg->sgt.sgl->length,
468 msg->ttype, msg->context);
469 if (msg->destructor)
470 msg->destructor(msg);
471 else
472 hsi_free_msg(msg);
473 }
474 }
475
476 static int ssi_setup(struct hsi_client *cl)
477 {
478 struct hsi_port *port = to_hsi_port(cl->device.parent);
479 struct omap_ssi_port *omap_port = hsi_port_drvdata(port);
480 struct hsi_controller *ssi = to_hsi_controller(port->device.parent);
481 struct omap_ssi_controller *omap_ssi = hsi_controller_drvdata(ssi);
482 void __iomem *sst = omap_port->sst_base;
483 void __iomem *ssr = omap_port->ssr_base;
484 u32 div;
485 u32 val;
486 int err = 0;
487
488 pm_runtime_get_sync(omap_port->pdev);
489 spin_lock_bh(&omap_port->lock);
490 if (cl->tx_cfg.speed)
491 omap_ssi->max_speed = cl->tx_cfg.speed;
492 div = ssi_calculate_div(ssi);
493 if (div > SSI_MAX_DIVISOR) {
494 dev_err(&cl->device, "Invalid TX speed %d Mb/s (div %d)\n",
495 cl->tx_cfg.speed, div);
496 err = -EINVAL;
497 goto out;
498 }
499 /* Set TX/RX module to sleep to stop TX/RX during cfg update */
500 writel_relaxed(SSI_MODE_SLEEP, sst + SSI_SST_MODE_REG);
501 writel_relaxed(SSI_MODE_SLEEP, ssr + SSI_SSR_MODE_REG);
502 /* Flush posted write */
503 val = readl(ssr + SSI_SSR_MODE_REG);
504 /* TX */
505 writel_relaxed(31, sst + SSI_SST_FRAMESIZE_REG);
506 writel_relaxed(div, sst + SSI_SST_DIVISOR_REG);
507 writel_relaxed(cl->tx_cfg.num_hw_channels, sst + SSI_SST_CHANNELS_REG);
508 writel_relaxed(cl->tx_cfg.arb_mode, sst + SSI_SST_ARBMODE_REG);
509 writel_relaxed(cl->tx_cfg.mode, sst + SSI_SST_MODE_REG);
510 /* RX */
511 writel_relaxed(31, ssr + SSI_SSR_FRAMESIZE_REG);
512 writel_relaxed(cl->rx_cfg.num_hw_channels, ssr + SSI_SSR_CHANNELS_REG);
513 writel_relaxed(0, ssr + SSI_SSR_TIMEOUT_REG);
514 /* Cleanup the break queue if we leave FRAME mode */
515 if ((omap_port->ssr.mode == SSI_MODE_FRAME) &&
516 (cl->rx_cfg.mode != SSI_MODE_FRAME))
517 ssi_flush_queue(&omap_port->brkqueue, cl);
518 writel_relaxed(cl->rx_cfg.mode, ssr + SSI_SSR_MODE_REG);
519 omap_port->channels = max(cl->rx_cfg.num_hw_channels,
520 cl->tx_cfg.num_hw_channels);
521 /* Shadow registering for OFF mode */
522 /* SST */
523 omap_port->sst.divisor = div;
524 omap_port->sst.frame_size = 31;
525 omap_port->sst.channels = cl->tx_cfg.num_hw_channels;
526 omap_port->sst.arb_mode = cl->tx_cfg.arb_mode;
527 omap_port->sst.mode = cl->tx_cfg.mode;
528 /* SSR */
529 omap_port->ssr.frame_size = 31;
530 omap_port->ssr.timeout = 0;
531 omap_port->ssr.channels = cl->rx_cfg.num_hw_channels;
532 omap_port->ssr.mode = cl->rx_cfg.mode;
533 out:
534 spin_unlock_bh(&omap_port->lock);
535 pm_runtime_mark_last_busy(omap_port->pdev);
536 pm_runtime_put_autosuspend(omap_port->pdev);
537
538 return err;
539 }
540
541 static int ssi_flush(struct hsi_client *cl)
542 {
543 struct hsi_port *port = hsi_get_port(cl);
544 struct omap_ssi_port *omap_port = hsi_port_drvdata(port);
545 struct hsi_controller *ssi = to_hsi_controller(port->device.parent);
546 struct omap_ssi_controller *omap_ssi = hsi_controller_drvdata(ssi);
547 struct hsi_msg *msg;
548 void __iomem *sst = omap_port->sst_base;
549 void __iomem *ssr = omap_port->ssr_base;
550 unsigned int i;
551 u32 err;
552
553 pm_runtime_get_sync(omap_port->pdev);
554 spin_lock_bh(&omap_port->lock);
555
556 /* stop all ssi communication */
557 pinctrl_pm_select_idle_state(omap_port->pdev);
558 udelay(1); /* wait for racing frames */
559
560 /* Stop all DMA transfers */
561 for (i = 0; i < SSI_MAX_GDD_LCH; i++) {
562 msg = omap_ssi->gdd_trn[i].msg;
563 if (!msg || (port != hsi_get_port(msg->cl)))
564 continue;
565 writew_relaxed(0, omap_ssi->gdd + SSI_GDD_CCR_REG(i));
566 if (msg->ttype == HSI_MSG_READ)
567 pm_runtime_put_autosuspend(omap_port->pdev);
568 omap_ssi->gdd_trn[i].msg = NULL;
569 }
570 /* Flush all SST buffers */
571 writel_relaxed(0, sst + SSI_SST_BUFSTATE_REG);
572 writel_relaxed(0, sst + SSI_SST_TXSTATE_REG);
573 /* Flush all SSR buffers */
574 writel_relaxed(0, ssr + SSI_SSR_RXSTATE_REG);
575 writel_relaxed(0, ssr + SSI_SSR_BUFSTATE_REG);
576 /* Flush all errors */
577 err = readl(ssr + SSI_SSR_ERROR_REG);
578 writel_relaxed(err, ssr + SSI_SSR_ERRORACK_REG);
579 /* Flush break */
580 writel_relaxed(0, ssr + SSI_SSR_BREAK_REG);
581 /* Clear interrupts */
582 writel_relaxed(0, omap_ssi->sys + SSI_MPU_ENABLE_REG(port->num, 0));
583 writel_relaxed(0xffffff00,
584 omap_ssi->sys + SSI_MPU_STATUS_REG(port->num, 0));
585 writel_relaxed(0, omap_ssi->sys + SSI_GDD_MPU_IRQ_ENABLE_REG);
586 writel(0xff, omap_ssi->sys + SSI_GDD_MPU_IRQ_STATUS_REG);
587 /* Dequeue all pending requests */
588 for (i = 0; i < omap_port->channels; i++) {
589 /* Release write clocks */
590 if (!list_empty(&omap_port->txqueue[i]))
591 pm_runtime_put_autosuspend(omap_port->pdev);
592 ssi_flush_queue(&omap_port->txqueue[i], NULL);
593 ssi_flush_queue(&omap_port->rxqueue[i], NULL);
594 }
595 ssi_flush_queue(&omap_port->brkqueue, NULL);
596
597 /* Resume SSI communication */
598 pinctrl_pm_select_default_state(omap_port->pdev);
599
600 spin_unlock_bh(&omap_port->lock);
601 pm_runtime_mark_last_busy(omap_port->pdev);
602 pm_runtime_put_autosuspend(omap_port->pdev);
603
604 return 0;
605 }
606
607 static void start_tx_work(struct work_struct *work)
608 {
609 struct omap_ssi_port *omap_port =
610 container_of(work, struct omap_ssi_port, work);
611 struct hsi_port *port = to_hsi_port(omap_port->dev);
612 struct hsi_controller *ssi = to_hsi_controller(port->device.parent);
613 struct omap_ssi_controller *omap_ssi = hsi_controller_drvdata(ssi);
614
615 pm_runtime_get_sync(omap_port->pdev); /* Grab clocks */
616 writel(SSI_WAKE(0), omap_ssi->sys + SSI_SET_WAKE_REG(port->num));
617 }
618
619 static int ssi_start_tx(struct hsi_client *cl)
620 {
621 struct hsi_port *port = hsi_get_port(cl);
622 struct omap_ssi_port *omap_port = hsi_port_drvdata(port);
623
624 dev_dbg(&port->device, "Wake out high %d\n", omap_port->wk_refcount);
625
626 spin_lock_bh(&omap_port->wk_lock);
627 if (omap_port->wk_refcount++) {
628 spin_unlock_bh(&omap_port->wk_lock);
629 return 0;
630 }
631 spin_unlock_bh(&omap_port->wk_lock);
632
633 schedule_work(&omap_port->work);
634
635 return 0;
636 }
637
638 static int ssi_stop_tx(struct hsi_client *cl)
639 {
640 struct hsi_port *port = hsi_get_port(cl);
641 struct omap_ssi_port *omap_port = hsi_port_drvdata(port);
642 struct hsi_controller *ssi = to_hsi_controller(port->device.parent);
643 struct omap_ssi_controller *omap_ssi = hsi_controller_drvdata(ssi);
644
645 dev_dbg(&port->device, "Wake out low %d\n", omap_port->wk_refcount);
646
647 spin_lock_bh(&omap_port->wk_lock);
648 BUG_ON(!omap_port->wk_refcount);
649 if (--omap_port->wk_refcount) {
650 spin_unlock_bh(&omap_port->wk_lock);
651 return 0;
652 }
653 writel(SSI_WAKE(0), omap_ssi->sys + SSI_CLEAR_WAKE_REG(port->num));
654 spin_unlock_bh(&omap_port->wk_lock);
655
656 pm_runtime_mark_last_busy(omap_port->pdev);
657 pm_runtime_put_autosuspend(omap_port->pdev); /* Release clocks */
658
659
660 return 0;
661 }
662
663 static void ssi_transfer(struct omap_ssi_port *omap_port,
664 struct list_head *queue)
665 {
666 struct hsi_msg *msg;
667 int err = -1;
668
669 pm_runtime_get(omap_port->pdev);
670 spin_lock_bh(&omap_port->lock);
671 while (err < 0) {
672 err = ssi_start_transfer(queue);
673 if (err < 0) {
674 msg = list_first_entry(queue, struct hsi_msg, link);
675 msg->status = HSI_STATUS_ERROR;
676 msg->actual_len = 0;
677 list_del(&msg->link);
678 spin_unlock_bh(&omap_port->lock);
679 msg->complete(msg);
680 spin_lock_bh(&omap_port->lock);
681 }
682 }
683 spin_unlock_bh(&omap_port->lock);
684 pm_runtime_mark_last_busy(omap_port->pdev);
685 pm_runtime_put_autosuspend(omap_port->pdev);
686 }
687
688 static void ssi_cleanup_queues(struct hsi_client *cl)
689 {
690 struct hsi_port *port = hsi_get_port(cl);
691 struct omap_ssi_port *omap_port = hsi_port_drvdata(port);
692 struct hsi_controller *ssi = to_hsi_controller(port->device.parent);
693 struct omap_ssi_controller *omap_ssi = hsi_controller_drvdata(ssi);
694 struct hsi_msg *msg;
695 unsigned int i;
696 u32 rxbufstate = 0;
697 u32 txbufstate = 0;
698 u32 status = SSI_ERROROCCURED;
699 u32 tmp;
700
701 ssi_flush_queue(&omap_port->brkqueue, cl);
702 if (list_empty(&omap_port->brkqueue))
703 status |= SSI_BREAKDETECTED;
704
705 for (i = 0; i < omap_port->channels; i++) {
706 if (list_empty(&omap_port->txqueue[i]))
707 continue;
708 msg = list_first_entry(&omap_port->txqueue[i], struct hsi_msg,
709 link);
710 if ((msg->cl == cl) && (msg->status == HSI_STATUS_PROCEEDING)) {
711 txbufstate |= (1 << i);
712 status |= SSI_DATAACCEPT(i);
713 /* Release the clocks writes, also GDD ones */
714 pm_runtime_mark_last_busy(omap_port->pdev);
715 pm_runtime_put_autosuspend(omap_port->pdev);
716 }
717 ssi_flush_queue(&omap_port->txqueue[i], cl);
718 }
719 for (i = 0; i < omap_port->channels; i++) {
720 if (list_empty(&omap_port->rxqueue[i]))
721 continue;
722 msg = list_first_entry(&omap_port->rxqueue[i], struct hsi_msg,
723 link);
724 if ((msg->cl == cl) && (msg->status == HSI_STATUS_PROCEEDING)) {
725 rxbufstate |= (1 << i);
726 status |= SSI_DATAAVAILABLE(i);
727 }
728 ssi_flush_queue(&omap_port->rxqueue[i], cl);
729 /* Check if we keep the error detection interrupt armed */
730 if (!list_empty(&omap_port->rxqueue[i]))
731 status &= ~SSI_ERROROCCURED;
732 }
733 /* Cleanup write buffers */
734 tmp = readl(omap_port->sst_base + SSI_SST_BUFSTATE_REG);
735 tmp &= ~txbufstate;
736 writel_relaxed(tmp, omap_port->sst_base + SSI_SST_BUFSTATE_REG);
737 /* Cleanup read buffers */
738 tmp = readl(omap_port->ssr_base + SSI_SSR_BUFSTATE_REG);
739 tmp &= ~rxbufstate;
740 writel_relaxed(tmp, omap_port->ssr_base + SSI_SSR_BUFSTATE_REG);
741 /* Disarm and ack pending interrupts */
742 tmp = readl(omap_ssi->sys + SSI_MPU_ENABLE_REG(port->num, 0));
743 tmp &= ~status;
744 writel_relaxed(tmp, omap_ssi->sys + SSI_MPU_ENABLE_REG(port->num, 0));
745 writel_relaxed(status, omap_ssi->sys +
746 SSI_MPU_STATUS_REG(port->num, 0));
747 }
748
749 static void ssi_cleanup_gdd(struct hsi_controller *ssi, struct hsi_client *cl)
750 {
751 struct omap_ssi_controller *omap_ssi = hsi_controller_drvdata(ssi);
752 struct hsi_port *port = hsi_get_port(cl);
753 struct omap_ssi_port *omap_port = hsi_port_drvdata(port);
754 struct hsi_msg *msg;
755 unsigned int i;
756 u32 val = 0;
757 u32 tmp;
758
759 for (i = 0; i < SSI_MAX_GDD_LCH; i++) {
760 msg = omap_ssi->gdd_trn[i].msg;
761 if ((!msg) || (msg->cl != cl))
762 continue;
763 writew_relaxed(0, omap_ssi->gdd + SSI_GDD_CCR_REG(i));
764 val |= (1 << i);
765 /*
766 * Clock references for write will be handled in
767 * ssi_cleanup_queues
768 */
769 if (msg->ttype == HSI_MSG_READ) {
770 pm_runtime_mark_last_busy(omap_port->pdev);
771 pm_runtime_put_autosuspend(omap_port->pdev);
772 }
773 omap_ssi->gdd_trn[i].msg = NULL;
774 }
775 tmp = readl_relaxed(omap_ssi->sys + SSI_GDD_MPU_IRQ_ENABLE_REG);
776 tmp &= ~val;
777 writel_relaxed(tmp, omap_ssi->sys + SSI_GDD_MPU_IRQ_ENABLE_REG);
778 writel(val, omap_ssi->sys + SSI_GDD_MPU_IRQ_STATUS_REG);
779 }
780
781 static int ssi_set_port_mode(struct omap_ssi_port *omap_port, u32 mode)
782 {
783 writel(mode, omap_port->sst_base + SSI_SST_MODE_REG);
784 writel(mode, omap_port->ssr_base + SSI_SSR_MODE_REG);
785 /* OCP barrier */
786 mode = readl(omap_port->ssr_base + SSI_SSR_MODE_REG);
787
788 return 0;
789 }
790
791 static int ssi_release(struct hsi_client *cl)
792 {
793 struct hsi_port *port = hsi_get_port(cl);
794 struct omap_ssi_port *omap_port = hsi_port_drvdata(port);
795 struct hsi_controller *ssi = to_hsi_controller(port->device.parent);
796
797 pm_runtime_get_sync(omap_port->pdev);
798 spin_lock_bh(&omap_port->lock);
799 /* Stop all the pending DMA requests for that client */
800 ssi_cleanup_gdd(ssi, cl);
801 /* Now cleanup all the queues */
802 ssi_cleanup_queues(cl);
803 /* If it is the last client of the port, do extra checks and cleanup */
804 if (port->claimed <= 1) {
805 /*
806 * Drop the clock reference for the incoming wake line
807 * if it is still kept high by the other side.
808 */
809 if (test_and_clear_bit(SSI_WAKE_EN, &omap_port->flags))
810 pm_runtime_put_sync(omap_port->pdev);
811 pm_runtime_get(omap_port->pdev);
812 /* Stop any SSI TX/RX without a client */
813 ssi_set_port_mode(omap_port, SSI_MODE_SLEEP);
814 omap_port->sst.mode = SSI_MODE_SLEEP;
815 omap_port->ssr.mode = SSI_MODE_SLEEP;
816 pm_runtime_put(omap_port->pdev);
817 WARN_ON(omap_port->wk_refcount != 0);
818 }
819 spin_unlock_bh(&omap_port->lock);
820 pm_runtime_put_sync(omap_port->pdev);
821
822 return 0;
823 }
824
825
826
827 static void ssi_error(struct hsi_port *port)
828 {
829 struct omap_ssi_port *omap_port = hsi_port_drvdata(port);
830 struct hsi_controller *ssi = to_hsi_controller(port->device.parent);
831 struct omap_ssi_controller *omap_ssi = hsi_controller_drvdata(ssi);
832 struct hsi_msg *msg;
833 unsigned int i;
834 u32 err;
835 u32 val;
836 u32 tmp;
837
838 /* ACK error */
839 err = readl(omap_port->ssr_base + SSI_SSR_ERROR_REG);
840 dev_err(&port->device, "SSI error: 0x%02x\n", err);
841 if (!err) {
842 dev_dbg(&port->device, "spurious SSI error ignored!\n");
843 return;
844 }
845 spin_lock(&omap_ssi->lock);
846 /* Cancel all GDD read transfers */
847 for (i = 0, val = 0; i < SSI_MAX_GDD_LCH; i++) {
848 msg = omap_ssi->gdd_trn[i].msg;
849 if ((msg) && (msg->ttype == HSI_MSG_READ)) {
850 writew_relaxed(0, omap_ssi->gdd + SSI_GDD_CCR_REG(i));
851 val |= (1 << i);
852 omap_ssi->gdd_trn[i].msg = NULL;
853 }
854 }
855 tmp = readl(omap_ssi->sys + SSI_GDD_MPU_IRQ_ENABLE_REG);
856 tmp &= ~val;
857 writel_relaxed(tmp, omap_ssi->sys + SSI_GDD_MPU_IRQ_ENABLE_REG);
858 spin_unlock(&omap_ssi->lock);
859 /* Cancel all PIO read transfers */
860 spin_lock(&omap_port->lock);
861 tmp = readl(omap_ssi->sys + SSI_MPU_ENABLE_REG(port->num, 0));
862 tmp &= 0xfeff00ff; /* Disable error & all dataavailable interrupts */
863 writel_relaxed(tmp, omap_ssi->sys + SSI_MPU_ENABLE_REG(port->num, 0));
864 /* ACK error */
865 writel_relaxed(err, omap_port->ssr_base + SSI_SSR_ERRORACK_REG);
866 writel_relaxed(SSI_ERROROCCURED,
867 omap_ssi->sys + SSI_MPU_STATUS_REG(port->num, 0));
868 /* Signal the error all current pending read requests */
869 for (i = 0; i < omap_port->channels; i++) {
870 if (list_empty(&omap_port->rxqueue[i]))
871 continue;
872 msg = list_first_entry(&omap_port->rxqueue[i], struct hsi_msg,
873 link);
874 list_del(&msg->link);
875 msg->status = HSI_STATUS_ERROR;
876 spin_unlock(&omap_port->lock);
877 msg->complete(msg);
878 /* Now restart queued reads if any */
879 ssi_transfer(omap_port, &omap_port->rxqueue[i]);
880 spin_lock(&omap_port->lock);
881 }
882 spin_unlock(&omap_port->lock);
883 }
884
885 static void ssi_break_complete(struct hsi_port *port)
886 {
887 struct omap_ssi_port *omap_port = hsi_port_drvdata(port);
888 struct hsi_controller *ssi = to_hsi_controller(port->device.parent);
889 struct omap_ssi_controller *omap_ssi = hsi_controller_drvdata(ssi);
890 struct hsi_msg *msg;
891 struct hsi_msg *tmp;
892 u32 val;
893
894 dev_dbg(&port->device, "HWBREAK received\n");
895
896 spin_lock(&omap_port->lock);
897 val = readl(omap_ssi->sys + SSI_MPU_ENABLE_REG(port->num, 0));
898 val &= ~SSI_BREAKDETECTED;
899 writel_relaxed(val, omap_ssi->sys + SSI_MPU_ENABLE_REG(port->num, 0));
900 writel_relaxed(0, omap_port->ssr_base + SSI_SSR_BREAK_REG);
901 writel(SSI_BREAKDETECTED,
902 omap_ssi->sys + SSI_MPU_STATUS_REG(port->num, 0));
903 spin_unlock(&omap_port->lock);
904
905 list_for_each_entry_safe(msg, tmp, &omap_port->brkqueue, link) {
906 msg->status = HSI_STATUS_COMPLETED;
907 spin_lock(&omap_port->lock);
908 list_del(&msg->link);
909 spin_unlock(&omap_port->lock);
910 msg->complete(msg);
911 }
912
913 }
914
915 static void ssi_pio_complete(struct hsi_port *port, struct list_head *queue)
916 {
917 struct hsi_controller *ssi = to_hsi_controller(port->device.parent);
918 struct omap_ssi_controller *omap_ssi = hsi_controller_drvdata(ssi);
919 struct omap_ssi_port *omap_port = hsi_port_drvdata(port);
920 struct hsi_msg *msg;
921 u32 *buf;
922 u32 reg;
923 u32 val;
924
925 spin_lock_bh(&omap_port->lock);
926 msg = list_first_entry(queue, struct hsi_msg, link);
927 if ((!msg->sgt.nents) || (!msg->sgt.sgl->length)) {
928 msg->actual_len = 0;
929 msg->status = HSI_STATUS_PENDING;
930 }
931 if (msg->ttype == HSI_MSG_WRITE)
932 val = SSI_DATAACCEPT(msg->channel);
933 else
934 val = SSI_DATAAVAILABLE(msg->channel);
935 if (msg->status == HSI_STATUS_PROCEEDING) {
936 buf = sg_virt(msg->sgt.sgl) + msg->actual_len;
937 if (msg->ttype == HSI_MSG_WRITE)
938 writel(*buf, omap_port->sst_base +
939 SSI_SST_BUFFER_CH_REG(msg->channel));
940 else
941 *buf = readl(omap_port->ssr_base +
942 SSI_SSR_BUFFER_CH_REG(msg->channel));
943 dev_dbg(&port->device, "ch %d ttype %d 0x%08x\n", msg->channel,
944 msg->ttype, *buf);
945 msg->actual_len += sizeof(*buf);
946 if (msg->actual_len >= msg->sgt.sgl->length)
947 msg->status = HSI_STATUS_COMPLETED;
948 /*
949 * Wait for the last written frame to be really sent before
950 * we call the complete callback
951 */
952 if ((msg->status == HSI_STATUS_PROCEEDING) ||
953 ((msg->status == HSI_STATUS_COMPLETED) &&
954 (msg->ttype == HSI_MSG_WRITE))) {
955 writel(val, omap_ssi->sys +
956 SSI_MPU_STATUS_REG(port->num, 0));
957 spin_unlock_bh(&omap_port->lock);
958
959 return;
960 }
961
962 }
963 /* Transfer completed at this point */
964 reg = readl(omap_ssi->sys + SSI_MPU_ENABLE_REG(port->num, 0));
965 if (msg->ttype == HSI_MSG_WRITE) {
966 /* Release clocks for write transfer */
967 pm_runtime_mark_last_busy(omap_port->pdev);
968 pm_runtime_put_autosuspend(omap_port->pdev);
969 }
970 reg &= ~val;
971 writel_relaxed(reg, omap_ssi->sys + SSI_MPU_ENABLE_REG(port->num, 0));
972 writel_relaxed(val, omap_ssi->sys + SSI_MPU_STATUS_REG(port->num, 0));
973 list_del(&msg->link);
974 spin_unlock_bh(&omap_port->lock);
975 msg->complete(msg);
976 ssi_transfer(omap_port, queue);
977 }
978
979 static irqreturn_t ssi_pio_thread(int irq, void *ssi_port)
980 {
981 struct hsi_port *port = (struct hsi_port *)ssi_port;
982 struct hsi_controller *ssi = to_hsi_controller(port->device.parent);
983 struct omap_ssi_port *omap_port = hsi_port_drvdata(port);
984 struct omap_ssi_controller *omap_ssi = hsi_controller_drvdata(ssi);
985 void __iomem *sys = omap_ssi->sys;
986 unsigned int ch;
987 u32 status_reg;
988
989 pm_runtime_get_sync(omap_port->pdev);
990
991 do {
992 status_reg = readl(sys + SSI_MPU_STATUS_REG(port->num, 0));
993 status_reg &= readl(sys + SSI_MPU_ENABLE_REG(port->num, 0));
994
995 for (ch = 0; ch < omap_port->channels; ch++) {
996 if (status_reg & SSI_DATAACCEPT(ch))
997 ssi_pio_complete(port, &omap_port->txqueue[ch]);
998 if (status_reg & SSI_DATAAVAILABLE(ch))
999 ssi_pio_complete(port, &omap_port->rxqueue[ch]);
1000 }
1001 if (status_reg & SSI_BREAKDETECTED)
1002 ssi_break_complete(port);
1003 if (status_reg & SSI_ERROROCCURED)
1004 ssi_error(port);
1005
1006 status_reg = readl(sys + SSI_MPU_STATUS_REG(port->num, 0));
1007 status_reg &= readl(sys + SSI_MPU_ENABLE_REG(port->num, 0));
1008
1009 /* TODO: sleep if we retry? */
1010 } while (status_reg);
1011
1012 pm_runtime_mark_last_busy(omap_port->pdev);
1013 pm_runtime_put_autosuspend(omap_port->pdev);
1014
1015 return IRQ_HANDLED;
1016 }
1017
1018 static irqreturn_t ssi_wake_thread(int irq __maybe_unused, void *ssi_port)
1019 {
1020 struct hsi_port *port = (struct hsi_port *)ssi_port;
1021 struct hsi_controller *ssi = to_hsi_controller(port->device.parent);
1022 struct omap_ssi_port *omap_port = hsi_port_drvdata(port);
1023 struct omap_ssi_controller *omap_ssi = hsi_controller_drvdata(ssi);
1024
1025 if (ssi_wakein(port)) {
1026 /**
1027 * We can have a quick High-Low-High transition in the line.
1028 * In such a case if we have long interrupt latencies,
1029 * we can miss the low event or get twice a high event.
1030 * This workaround will avoid breaking the clock reference
1031 * count when such a situation ocurrs.
1032 */
1033 if (!test_and_set_bit(SSI_WAKE_EN, &omap_port->flags))
1034 pm_runtime_get_sync(omap_port->pdev);
1035 dev_dbg(&ssi->device, "Wake in high\n");
1036 if (omap_port->wktest) { /* FIXME: HACK ! To be removed */
1037 writel(SSI_WAKE(0),
1038 omap_ssi->sys + SSI_SET_WAKE_REG(port->num));
1039 }
1040 hsi_event(port, HSI_EVENT_START_RX);
1041 } else {
1042 dev_dbg(&ssi->device, "Wake in low\n");
1043 if (omap_port->wktest) { /* FIXME: HACK ! To be removed */
1044 writel(SSI_WAKE(0),
1045 omap_ssi->sys + SSI_CLEAR_WAKE_REG(port->num));
1046 }
1047 hsi_event(port, HSI_EVENT_STOP_RX);
1048 if (test_and_clear_bit(SSI_WAKE_EN, &omap_port->flags)) {
1049 pm_runtime_mark_last_busy(omap_port->pdev);
1050 pm_runtime_put_autosuspend(omap_port->pdev);
1051 }
1052 }
1053
1054 return IRQ_HANDLED;
1055 }
1056
1057 static int ssi_port_irq(struct hsi_port *port, struct platform_device *pd)
1058 {
1059 struct omap_ssi_port *omap_port = hsi_port_drvdata(port);
1060 int err;
1061
1062 err = platform_get_irq(pd, 0);
1063 if (err < 0) {
1064 dev_err(&port->device, "Port IRQ resource missing\n");
1065 return err;
1066 }
1067 omap_port->irq = err;
1068 err = devm_request_threaded_irq(&port->device, omap_port->irq, NULL,
1069 ssi_pio_thread, IRQF_ONESHOT, "SSI PORT", port);
1070 if (err < 0)
1071 dev_err(&port->device, "Request IRQ %d failed (%d)\n",
1072 omap_port->irq, err);
1073 return err;
1074 }
1075
1076 static int ssi_wake_irq(struct hsi_port *port, struct platform_device *pd)
1077 {
1078 struct omap_ssi_port *omap_port = hsi_port_drvdata(port);
1079 int cawake_irq;
1080 int err;
1081
1082 if (!omap_port->wake_gpio) {
1083 omap_port->wake_irq = -1;
1084 return 0;
1085 }
1086
1087 cawake_irq = gpiod_to_irq(omap_port->wake_gpio);
1088 omap_port->wake_irq = cawake_irq;
1089
1090 err = devm_request_threaded_irq(&port->device, cawake_irq, NULL,
1091 ssi_wake_thread,
1092 IRQF_TRIGGER_RISING | IRQF_TRIGGER_FALLING | IRQF_ONESHOT,
1093 "SSI cawake", port);
1094 if (err < 0)
1095 dev_err(&port->device, "Request Wake in IRQ %d failed %d\n",
1096 cawake_irq, err);
1097 err = enable_irq_wake(cawake_irq);
1098 if (err < 0)
1099 dev_err(&port->device, "Enable wake on the wakeline in irq %d failed %d\n",
1100 cawake_irq, err);
1101
1102 return err;
1103 }
1104
1105 static void ssi_queues_init(struct omap_ssi_port *omap_port)
1106 {
1107 unsigned int ch;
1108
1109 for (ch = 0; ch < SSI_MAX_CHANNELS; ch++) {
1110 INIT_LIST_HEAD(&omap_port->txqueue[ch]);
1111 INIT_LIST_HEAD(&omap_port->rxqueue[ch]);
1112 }
1113 INIT_LIST_HEAD(&omap_port->brkqueue);
1114 }
1115
1116 static int ssi_port_get_iomem(struct platform_device *pd,
1117 const char *name, void __iomem **pbase, dma_addr_t *phy)
1118 {
1119 struct hsi_port *port = platform_get_drvdata(pd);
1120 struct resource *mem;
1121 struct resource *ioarea;
1122 void __iomem *base;
1123
1124 mem = platform_get_resource_byname(pd, IORESOURCE_MEM, name);
1125 if (!mem) {
1126 dev_err(&pd->dev, "IO memory region missing (%s)\n", name);
1127 return -ENXIO;
1128 }
1129 ioarea = devm_request_mem_region(&port->device, mem->start,
1130 resource_size(mem), dev_name(&pd->dev));
1131 if (!ioarea) {
1132 dev_err(&pd->dev, "%s IO memory region request failed\n",
1133 mem->name);
1134 return -ENXIO;
1135 }
1136 base = devm_ioremap(&port->device, mem->start, resource_size(mem));
1137 if (!base) {
1138 dev_err(&pd->dev, "%s IO remap failed\n", mem->name);
1139 return -ENXIO;
1140 }
1141 *pbase = base;
1142
1143 if (phy)
1144 *phy = mem->start;
1145
1146 return 0;
1147 }
1148
1149 static int ssi_port_probe(struct platform_device *pd)
1150 {
1151 struct device_node *np = pd->dev.of_node;
1152 struct hsi_port *port;
1153 struct omap_ssi_port *omap_port;
1154 struct hsi_controller *ssi = dev_get_drvdata(pd->dev.parent);
1155 struct omap_ssi_controller *omap_ssi = hsi_controller_drvdata(ssi);
1156 struct gpio_desc *cawake_gpio = NULL;
1157 u32 port_id;
1158 int err;
1159
1160 dev_dbg(&pd->dev, "init ssi port...\n");
1161
1162 if (!ssi->port || !omap_ssi->port) {
1163 dev_err(&pd->dev, "ssi controller not initialized!\n");
1164 err = -ENODEV;
1165 goto error;
1166 }
1167
1168 /* get id of first uninitialized port in controller */
1169 for (port_id = 0; port_id < ssi->num_ports && omap_ssi->port[port_id];
1170 port_id++)
1171 ;
1172
1173 if (port_id >= ssi->num_ports) {
1174 dev_err(&pd->dev, "port id out of range!\n");
1175 err = -ENODEV;
1176 goto error;
1177 }
1178
1179 port = ssi->port[port_id];
1180
1181 if (!np) {
1182 dev_err(&pd->dev, "missing device tree data\n");
1183 err = -EINVAL;
1184 goto error;
1185 }
1186
1187 cawake_gpio = devm_gpiod_get(&pd->dev, "ti,ssi-cawake", GPIOD_IN);
1188 if (IS_ERR(cawake_gpio)) {
1189 err = PTR_ERR(cawake_gpio);
1190 dev_err(&pd->dev, "couldn't get cawake gpio (err=%d)!\n", err);
1191 goto error;
1192 }
1193
1194 omap_port = devm_kzalloc(&port->device, sizeof(*omap_port), GFP_KERNEL);
1195 if (!omap_port) {
1196 err = -ENOMEM;
1197 goto error;
1198 }
1199 omap_port->wake_gpio = cawake_gpio;
1200 omap_port->pdev = &pd->dev;
1201 omap_port->port_id = port_id;
1202
1203 INIT_DEFERRABLE_WORK(&omap_port->errqueue_work, ssi_process_errqueue);
1204 INIT_WORK(&omap_port->work, start_tx_work);
1205
1206 /* initialize HSI port */
1207 port->async = ssi_async;
1208 port->setup = ssi_setup;
1209 port->flush = ssi_flush;
1210 port->start_tx = ssi_start_tx;
1211 port->stop_tx = ssi_stop_tx;
1212 port->release = ssi_release;
1213 hsi_port_set_drvdata(port, omap_port);
1214 omap_ssi->port[port_id] = omap_port;
1215
1216 platform_set_drvdata(pd, port);
1217
1218 err = ssi_port_get_iomem(pd, "tx", &omap_port->sst_base,
1219 &omap_port->sst_dma);
1220 if (err < 0)
1221 goto error;
1222 err = ssi_port_get_iomem(pd, "rx", &omap_port->ssr_base,
1223 &omap_port->ssr_dma);
1224 if (err < 0)
1225 goto error;
1226
1227 err = ssi_port_irq(port, pd);
1228 if (err < 0)
1229 goto error;
1230 err = ssi_wake_irq(port, pd);
1231 if (err < 0)
1232 goto error;
1233
1234 ssi_queues_init(omap_port);
1235 spin_lock_init(&omap_port->lock);
1236 spin_lock_init(&omap_port->wk_lock);
1237 omap_port->dev = &port->device;
1238
1239 pm_runtime_use_autosuspend(omap_port->pdev);
1240 pm_runtime_set_autosuspend_delay(omap_port->pdev, 250);
1241 pm_runtime_enable(omap_port->pdev);
1242
1243 #ifdef CONFIG_DEBUG_FS
1244 err = ssi_debug_add_port(omap_port, omap_ssi->dir);
1245 if (err < 0) {
1246 pm_runtime_disable(omap_port->pdev);
1247 goto error;
1248 }
1249 #endif
1250
1251 hsi_add_clients_from_dt(port, np);
1252
1253 dev_info(&pd->dev, "ssi port %u successfully initialized\n", port_id);
1254
1255 return 0;
1256
1257 error:
1258 return err;
1259 }
1260
1261 static int ssi_port_remove(struct platform_device *pd)
1262 {
1263 struct hsi_port *port = platform_get_drvdata(pd);
1264 struct omap_ssi_port *omap_port = hsi_port_drvdata(port);
1265 struct hsi_controller *ssi = to_hsi_controller(port->device.parent);
1266 struct omap_ssi_controller *omap_ssi = hsi_controller_drvdata(ssi);
1267
1268 #ifdef CONFIG_DEBUG_FS
1269 ssi_debug_remove_port(port);
1270 #endif
1271
1272 cancel_delayed_work_sync(&omap_port->errqueue_work);
1273
1274 hsi_port_unregister_clients(port);
1275
1276 port->async = hsi_dummy_msg;
1277 port->setup = hsi_dummy_cl;
1278 port->flush = hsi_dummy_cl;
1279 port->start_tx = hsi_dummy_cl;
1280 port->stop_tx = hsi_dummy_cl;
1281 port->release = hsi_dummy_cl;
1282
1283 omap_ssi->port[omap_port->port_id] = NULL;
1284 platform_set_drvdata(pd, NULL);
1285
1286 pm_runtime_dont_use_autosuspend(&pd->dev);
1287 pm_runtime_disable(&pd->dev);
1288
1289 return 0;
1290 }
1291
1292 static int ssi_restore_divisor(struct omap_ssi_port *omap_port)
1293 {
1294 writel_relaxed(omap_port->sst.divisor,
1295 omap_port->sst_base + SSI_SST_DIVISOR_REG);
1296
1297 return 0;
1298 }
1299
1300 void omap_ssi_port_update_fclk(struct hsi_controller *ssi,
1301 struct omap_ssi_port *omap_port)
1302 {
1303 /* update divisor */
1304 u32 div = ssi_calculate_div(ssi);
1305 omap_port->sst.divisor = div;
1306 ssi_restore_divisor(omap_port);
1307 }
1308
1309 #ifdef CONFIG_PM
1310 static int ssi_save_port_ctx(struct omap_ssi_port *omap_port)
1311 {
1312 struct hsi_port *port = to_hsi_port(omap_port->dev);
1313 struct hsi_controller *ssi = to_hsi_controller(port->device.parent);
1314 struct omap_ssi_controller *omap_ssi = hsi_controller_drvdata(ssi);
1315
1316 omap_port->sys_mpu_enable = readl(omap_ssi->sys +
1317 SSI_MPU_ENABLE_REG(port->num, 0));
1318
1319 return 0;
1320 }
1321
1322 static int ssi_restore_port_ctx(struct omap_ssi_port *omap_port)
1323 {
1324 struct hsi_port *port = to_hsi_port(omap_port->dev);
1325 struct hsi_controller *ssi = to_hsi_controller(port->device.parent);
1326 struct omap_ssi_controller *omap_ssi = hsi_controller_drvdata(ssi);
1327 void __iomem *base;
1328
1329 writel_relaxed(omap_port->sys_mpu_enable,
1330 omap_ssi->sys + SSI_MPU_ENABLE_REG(port->num, 0));
1331
1332 /* SST context */
1333 base = omap_port->sst_base;
1334 writel_relaxed(omap_port->sst.frame_size, base + SSI_SST_FRAMESIZE_REG);
1335 writel_relaxed(omap_port->sst.channels, base + SSI_SST_CHANNELS_REG);
1336 writel_relaxed(omap_port->sst.arb_mode, base + SSI_SST_ARBMODE_REG);
1337
1338 /* SSR context */
1339 base = omap_port->ssr_base;
1340 writel_relaxed(omap_port->ssr.frame_size, base + SSI_SSR_FRAMESIZE_REG);
1341 writel_relaxed(omap_port->ssr.channels, base + SSI_SSR_CHANNELS_REG);
1342 writel_relaxed(omap_port->ssr.timeout, base + SSI_SSR_TIMEOUT_REG);
1343
1344 return 0;
1345 }
1346
1347 static int ssi_restore_port_mode(struct omap_ssi_port *omap_port)
1348 {
1349 u32 mode;
1350
1351 writel_relaxed(omap_port->sst.mode,
1352 omap_port->sst_base + SSI_SST_MODE_REG);
1353 writel_relaxed(omap_port->ssr.mode,
1354 omap_port->ssr_base + SSI_SSR_MODE_REG);
1355 /* OCP barrier */
1356 mode = readl(omap_port->ssr_base + SSI_SSR_MODE_REG);
1357
1358 return 0;
1359 }
1360
1361 static int omap_ssi_port_runtime_suspend(struct device *dev)
1362 {
1363 struct hsi_port *port = dev_get_drvdata(dev);
1364 struct omap_ssi_port *omap_port = hsi_port_drvdata(port);
1365 struct hsi_controller *ssi = to_hsi_controller(port->device.parent);
1366 struct omap_ssi_controller *omap_ssi = hsi_controller_drvdata(ssi);
1367
1368 dev_dbg(dev, "port runtime suspend!\n");
1369
1370 ssi_set_port_mode(omap_port, SSI_MODE_SLEEP);
1371 if (omap_ssi->get_loss)
1372 omap_port->loss_count =
1373 omap_ssi->get_loss(ssi->device.parent);
1374 ssi_save_port_ctx(omap_port);
1375
1376 return 0;
1377 }
1378
1379 static int omap_ssi_port_runtime_resume(struct device *dev)
1380 {
1381 struct hsi_port *port = dev_get_drvdata(dev);
1382 struct omap_ssi_port *omap_port = hsi_port_drvdata(port);
1383 struct hsi_controller *ssi = to_hsi_controller(port->device.parent);
1384 struct omap_ssi_controller *omap_ssi = hsi_controller_drvdata(ssi);
1385
1386 dev_dbg(dev, "port runtime resume!\n");
1387
1388 if ((omap_ssi->get_loss) && (omap_port->loss_count ==
1389 omap_ssi->get_loss(ssi->device.parent)))
1390 goto mode; /* We always need to restore the mode & TX divisor */
1391
1392 ssi_restore_port_ctx(omap_port);
1393
1394 mode:
1395 ssi_restore_divisor(omap_port);
1396 ssi_restore_port_mode(omap_port);
1397
1398 return 0;
1399 }
1400
1401 static const struct dev_pm_ops omap_ssi_port_pm_ops = {
1402 SET_RUNTIME_PM_OPS(omap_ssi_port_runtime_suspend,
1403 omap_ssi_port_runtime_resume, NULL)
1404 };
1405
1406 #define DEV_PM_OPS (&omap_ssi_port_pm_ops)
1407 #else
1408 #define DEV_PM_OPS NULL
1409 #endif
1410
1411
1412 #ifdef CONFIG_OF
1413 static const struct of_device_id omap_ssi_port_of_match[] = {
1414 { .compatible = "ti,omap3-ssi-port", },
1415 {},
1416 };
1417 MODULE_DEVICE_TABLE(of, omap_ssi_port_of_match);
1418 #else
1419 #define omap_ssi_port_of_match NULL
1420 #endif
1421
1422 struct platform_driver ssi_port_pdriver = {
1423 .probe = ssi_port_probe,
1424 .remove = ssi_port_remove,
1425 .driver = {
1426 .name = "omap_ssi_port",
1427 .of_match_table = omap_ssi_port_of_match,
1428 .pm = DEV_PM_OPS,
1429 },
1430 };
Linux kernel - Deliverables
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