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b209e047 SR |
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> | |
4bcf7414 | 26 | #include <linux/delay.h> |
b209e047 | 27 | |
73e6ce09 | 28 | #include <linux/gpio/consumer.h> |
ac8e3ff3 | 29 | #include <linux/pinctrl/consumer.h> |
b209e047 SR |
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); | |
73e6ce09 | 48 | return gpiod_get_value(omap_port->wake_gpio); |
b209e047 SR |
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_sync(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_sync(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_sync(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 | ||
0845e1f2 | 176 | static int ssi_debug_add_port(struct omap_ssi_port *omap_port, |
b209e047 SR |
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); | |
c2acb7c4 WY |
182 | if (!dir) |
183 | return -ENOMEM; | |
b209e047 SR |
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); | |
c2acb7c4 WY |
187 | if (!dir) |
188 | return -ENOMEM; | |
b209e047 SR |
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 int ssi_claim_lch(struct hsi_msg *msg) | |
197 | { | |
198 | ||
199 | struct hsi_port *port = hsi_get_port(msg->cl); | |
200 | struct hsi_controller *ssi = to_hsi_controller(port->device.parent); | |
201 | struct omap_ssi_controller *omap_ssi = hsi_controller_drvdata(ssi); | |
202 | int lch; | |
203 | ||
204 | for (lch = 0; lch < SSI_MAX_GDD_LCH; lch++) | |
205 | if (!omap_ssi->gdd_trn[lch].msg) { | |
206 | omap_ssi->gdd_trn[lch].msg = msg; | |
207 | omap_ssi->gdd_trn[lch].sg = msg->sgt.sgl; | |
208 | return lch; | |
209 | } | |
210 | ||
211 | return -EBUSY; | |
212 | } | |
213 | ||
214 | static int ssi_start_dma(struct hsi_msg *msg, int lch) | |
215 | { | |
216 | struct hsi_port *port = hsi_get_port(msg->cl); | |
217 | struct omap_ssi_port *omap_port = hsi_port_drvdata(port); | |
218 | struct hsi_controller *ssi = to_hsi_controller(port->device.parent); | |
219 | struct omap_ssi_controller *omap_ssi = hsi_controller_drvdata(ssi); | |
220 | void __iomem *gdd = omap_ssi->gdd; | |
221 | int err; | |
222 | u16 csdp; | |
223 | u16 ccr; | |
224 | u32 s_addr; | |
225 | u32 d_addr; | |
226 | u32 tmp; | |
227 | ||
228 | if (msg->ttype == HSI_MSG_READ) { | |
229 | err = dma_map_sg(&ssi->device, msg->sgt.sgl, msg->sgt.nents, | |
230 | DMA_FROM_DEVICE); | |
231 | if (err < 0) { | |
232 | dev_dbg(&ssi->device, "DMA map SG failed !\n"); | |
233 | return err; | |
234 | } | |
235 | csdp = SSI_DST_BURST_4x32_BIT | SSI_DST_MEMORY_PORT | | |
236 | SSI_SRC_SINGLE_ACCESS0 | SSI_SRC_PERIPHERAL_PORT | | |
237 | SSI_DATA_TYPE_S32; | |
238 | ccr = msg->channel + 0x10 + (port->num * 8); /* Sync */ | |
239 | ccr |= SSI_DST_AMODE_POSTINC | SSI_SRC_AMODE_CONST | | |
240 | SSI_CCR_ENABLE; | |
241 | s_addr = omap_port->ssr_dma + | |
242 | SSI_SSR_BUFFER_CH_REG(msg->channel); | |
243 | d_addr = sg_dma_address(msg->sgt.sgl); | |
244 | } else { | |
245 | err = dma_map_sg(&ssi->device, msg->sgt.sgl, msg->sgt.nents, | |
246 | DMA_TO_DEVICE); | |
247 | if (err < 0) { | |
248 | dev_dbg(&ssi->device, "DMA map SG failed !\n"); | |
249 | return err; | |
250 | } | |
251 | csdp = SSI_SRC_BURST_4x32_BIT | SSI_SRC_MEMORY_PORT | | |
252 | SSI_DST_SINGLE_ACCESS0 | SSI_DST_PERIPHERAL_PORT | | |
253 | SSI_DATA_TYPE_S32; | |
254 | ccr = (msg->channel + 1 + (port->num * 8)) & 0xf; /* Sync */ | |
255 | ccr |= SSI_SRC_AMODE_POSTINC | SSI_DST_AMODE_CONST | | |
256 | SSI_CCR_ENABLE; | |
257 | s_addr = sg_dma_address(msg->sgt.sgl); | |
258 | d_addr = omap_port->sst_dma + | |
259 | SSI_SST_BUFFER_CH_REG(msg->channel); | |
260 | } | |
261 | dev_dbg(&ssi->device, "lch %d cdsp %08x ccr %04x s_addr %08x d_addr %08x\n", | |
262 | lch, csdp, ccr, s_addr, d_addr); | |
263 | ||
264 | /* Hold clocks during the transfer */ | |
265 | pm_runtime_get_sync(omap_port->pdev); | |
266 | ||
267 | writew_relaxed(csdp, gdd + SSI_GDD_CSDP_REG(lch)); | |
268 | writew_relaxed(SSI_BLOCK_IE | SSI_TOUT_IE, gdd + SSI_GDD_CICR_REG(lch)); | |
269 | writel_relaxed(d_addr, gdd + SSI_GDD_CDSA_REG(lch)); | |
270 | writel_relaxed(s_addr, gdd + SSI_GDD_CSSA_REG(lch)); | |
271 | writew_relaxed(SSI_BYTES_TO_FRAMES(msg->sgt.sgl->length), | |
272 | gdd + SSI_GDD_CEN_REG(lch)); | |
273 | ||
274 | spin_lock_bh(&omap_ssi->lock); | |
275 | tmp = readl(omap_ssi->sys + SSI_GDD_MPU_IRQ_ENABLE_REG); | |
276 | tmp |= SSI_GDD_LCH(lch); | |
277 | writel_relaxed(tmp, omap_ssi->sys + SSI_GDD_MPU_IRQ_ENABLE_REG); | |
278 | spin_unlock_bh(&omap_ssi->lock); | |
279 | writew(ccr, gdd + SSI_GDD_CCR_REG(lch)); | |
280 | msg->status = HSI_STATUS_PROCEEDING; | |
281 | ||
282 | return 0; | |
283 | } | |
284 | ||
285 | static int ssi_start_pio(struct hsi_msg *msg) | |
286 | { | |
287 | struct hsi_port *port = hsi_get_port(msg->cl); | |
288 | struct omap_ssi_port *omap_port = hsi_port_drvdata(port); | |
289 | struct hsi_controller *ssi = to_hsi_controller(port->device.parent); | |
290 | struct omap_ssi_controller *omap_ssi = hsi_controller_drvdata(ssi); | |
291 | u32 val; | |
292 | ||
293 | pm_runtime_get_sync(omap_port->pdev); | |
294 | if (msg->ttype == HSI_MSG_WRITE) { | |
295 | val = SSI_DATAACCEPT(msg->channel); | |
296 | /* Hold clocks for pio writes */ | |
297 | pm_runtime_get_sync(omap_port->pdev); | |
298 | } else { | |
299 | val = SSI_DATAAVAILABLE(msg->channel) | SSI_ERROROCCURED; | |
300 | } | |
301 | dev_dbg(&port->device, "Single %s transfer\n", | |
302 | msg->ttype ? "write" : "read"); | |
303 | val |= readl(omap_ssi->sys + SSI_MPU_ENABLE_REG(port->num, 0)); | |
304 | writel(val, omap_ssi->sys + SSI_MPU_ENABLE_REG(port->num, 0)); | |
305 | pm_runtime_put_sync(omap_port->pdev); | |
306 | msg->actual_len = 0; | |
307 | msg->status = HSI_STATUS_PROCEEDING; | |
308 | ||
309 | return 0; | |
310 | } | |
311 | ||
312 | static int ssi_start_transfer(struct list_head *queue) | |
313 | { | |
314 | struct hsi_msg *msg; | |
315 | int lch = -1; | |
316 | ||
317 | if (list_empty(queue)) | |
318 | return 0; | |
319 | msg = list_first_entry(queue, struct hsi_msg, link); | |
320 | if (msg->status != HSI_STATUS_QUEUED) | |
321 | return 0; | |
322 | if ((msg->sgt.nents) && (msg->sgt.sgl->length > sizeof(u32))) | |
323 | lch = ssi_claim_lch(msg); | |
324 | if (lch >= 0) | |
325 | return ssi_start_dma(msg, lch); | |
326 | else | |
327 | return ssi_start_pio(msg); | |
328 | } | |
329 | ||
330 | static int ssi_async_break(struct hsi_msg *msg) | |
331 | { | |
332 | struct hsi_port *port = hsi_get_port(msg->cl); | |
333 | struct omap_ssi_port *omap_port = hsi_port_drvdata(port); | |
334 | struct hsi_controller *ssi = to_hsi_controller(port->device.parent); | |
335 | struct omap_ssi_controller *omap_ssi = hsi_controller_drvdata(ssi); | |
336 | int err = 0; | |
337 | u32 tmp; | |
338 | ||
339 | pm_runtime_get_sync(omap_port->pdev); | |
340 | if (msg->ttype == HSI_MSG_WRITE) { | |
341 | if (omap_port->sst.mode != SSI_MODE_FRAME) { | |
342 | err = -EINVAL; | |
343 | goto out; | |
344 | } | |
345 | writel(1, omap_port->sst_base + SSI_SST_BREAK_REG); | |
346 | msg->status = HSI_STATUS_COMPLETED; | |
347 | msg->complete(msg); | |
348 | } else { | |
349 | if (omap_port->ssr.mode != SSI_MODE_FRAME) { | |
350 | err = -EINVAL; | |
351 | goto out; | |
352 | } | |
353 | spin_lock_bh(&omap_port->lock); | |
354 | tmp = readl(omap_ssi->sys + | |
355 | SSI_MPU_ENABLE_REG(port->num, 0)); | |
356 | writel(tmp | SSI_BREAKDETECTED, | |
357 | omap_ssi->sys + SSI_MPU_ENABLE_REG(port->num, 0)); | |
358 | msg->status = HSI_STATUS_PROCEEDING; | |
359 | list_add_tail(&msg->link, &omap_port->brkqueue); | |
360 | spin_unlock_bh(&omap_port->lock); | |
361 | } | |
362 | out: | |
363 | pm_runtime_put_sync(omap_port->pdev); | |
364 | ||
365 | return err; | |
366 | } | |
367 | ||
368 | static int ssi_async(struct hsi_msg *msg) | |
369 | { | |
370 | struct hsi_port *port = hsi_get_port(msg->cl); | |
371 | struct omap_ssi_port *omap_port = hsi_port_drvdata(port); | |
372 | struct list_head *queue; | |
373 | int err = 0; | |
374 | ||
375 | BUG_ON(!msg); | |
376 | ||
377 | if (msg->sgt.nents > 1) | |
378 | return -ENOSYS; /* TODO: Add sg support */ | |
379 | ||
380 | if (msg->break_frame) | |
381 | return ssi_async_break(msg); | |
382 | ||
383 | if (msg->ttype) { | |
384 | BUG_ON(msg->channel >= omap_port->sst.channels); | |
385 | queue = &omap_port->txqueue[msg->channel]; | |
386 | } else { | |
387 | BUG_ON(msg->channel >= omap_port->ssr.channels); | |
388 | queue = &omap_port->rxqueue[msg->channel]; | |
389 | } | |
390 | msg->status = HSI_STATUS_QUEUED; | |
391 | spin_lock_bh(&omap_port->lock); | |
392 | list_add_tail(&msg->link, queue); | |
393 | err = ssi_start_transfer(queue); | |
394 | if (err < 0) { | |
395 | list_del(&msg->link); | |
396 | msg->status = HSI_STATUS_ERROR; | |
397 | } | |
398 | spin_unlock_bh(&omap_port->lock); | |
399 | dev_dbg(&port->device, "msg status %d ttype %d ch %d\n", | |
400 | msg->status, msg->ttype, msg->channel); | |
401 | ||
402 | return err; | |
403 | } | |
404 | ||
405 | static u32 ssi_calculate_div(struct hsi_controller *ssi) | |
406 | { | |
407 | struct omap_ssi_controller *omap_ssi = hsi_controller_drvdata(ssi); | |
408 | u32 tx_fckrate = (u32) omap_ssi->fck_rate; | |
409 | ||
410 | /* / 2 : SSI TX clock is always half of the SSI functional clock */ | |
411 | tx_fckrate >>= 1; | |
412 | /* Round down when tx_fckrate % omap_ssi->max_speed == 0 */ | |
413 | tx_fckrate--; | |
414 | dev_dbg(&ssi->device, "TX div %d for fck_rate %lu Khz speed %d Kb/s\n", | |
415 | tx_fckrate / omap_ssi->max_speed, omap_ssi->fck_rate, | |
416 | omap_ssi->max_speed); | |
417 | ||
418 | return tx_fckrate / omap_ssi->max_speed; | |
419 | } | |
420 | ||
421 | static void ssi_flush_queue(struct list_head *queue, struct hsi_client *cl) | |
422 | { | |
423 | struct list_head *node, *tmp; | |
424 | struct hsi_msg *msg; | |
425 | ||
426 | list_for_each_safe(node, tmp, queue) { | |
427 | msg = list_entry(node, struct hsi_msg, link); | |
428 | if ((cl) && (cl != msg->cl)) | |
429 | continue; | |
430 | list_del(node); | |
431 | pr_debug("flush queue: ch %d, msg %p len %d type %d ctxt %p\n", | |
432 | msg->channel, msg, msg->sgt.sgl->length, | |
433 | msg->ttype, msg->context); | |
434 | if (msg->destructor) | |
435 | msg->destructor(msg); | |
436 | else | |
437 | hsi_free_msg(msg); | |
438 | } | |
439 | } | |
440 | ||
441 | static int ssi_setup(struct hsi_client *cl) | |
442 | { | |
443 | struct hsi_port *port = to_hsi_port(cl->device.parent); | |
444 | struct omap_ssi_port *omap_port = hsi_port_drvdata(port); | |
445 | struct hsi_controller *ssi = to_hsi_controller(port->device.parent); | |
446 | struct omap_ssi_controller *omap_ssi = hsi_controller_drvdata(ssi); | |
447 | void __iomem *sst = omap_port->sst_base; | |
448 | void __iomem *ssr = omap_port->ssr_base; | |
449 | u32 div; | |
450 | u32 val; | |
451 | int err = 0; | |
452 | ||
453 | pm_runtime_get_sync(omap_port->pdev); | |
454 | spin_lock_bh(&omap_port->lock); | |
455 | if (cl->tx_cfg.speed) | |
456 | omap_ssi->max_speed = cl->tx_cfg.speed; | |
457 | div = ssi_calculate_div(ssi); | |
458 | if (div > SSI_MAX_DIVISOR) { | |
459 | dev_err(&cl->device, "Invalid TX speed %d Mb/s (div %d)\n", | |
460 | cl->tx_cfg.speed, div); | |
461 | err = -EINVAL; | |
462 | goto out; | |
463 | } | |
464 | /* Set TX/RX module to sleep to stop TX/RX during cfg update */ | |
465 | writel_relaxed(SSI_MODE_SLEEP, sst + SSI_SST_MODE_REG); | |
466 | writel_relaxed(SSI_MODE_SLEEP, ssr + SSI_SSR_MODE_REG); | |
467 | /* Flush posted write */ | |
468 | val = readl(ssr + SSI_SSR_MODE_REG); | |
469 | /* TX */ | |
470 | writel_relaxed(31, sst + SSI_SST_FRAMESIZE_REG); | |
471 | writel_relaxed(div, sst + SSI_SST_DIVISOR_REG); | |
472 | writel_relaxed(cl->tx_cfg.num_hw_channels, sst + SSI_SST_CHANNELS_REG); | |
473 | writel_relaxed(cl->tx_cfg.arb_mode, sst + SSI_SST_ARBMODE_REG); | |
474 | writel_relaxed(cl->tx_cfg.mode, sst + SSI_SST_MODE_REG); | |
475 | /* RX */ | |
476 | writel_relaxed(31, ssr + SSI_SSR_FRAMESIZE_REG); | |
477 | writel_relaxed(cl->rx_cfg.num_hw_channels, ssr + SSI_SSR_CHANNELS_REG); | |
478 | writel_relaxed(0, ssr + SSI_SSR_TIMEOUT_REG); | |
479 | /* Cleanup the break queue if we leave FRAME mode */ | |
480 | if ((omap_port->ssr.mode == SSI_MODE_FRAME) && | |
481 | (cl->rx_cfg.mode != SSI_MODE_FRAME)) | |
482 | ssi_flush_queue(&omap_port->brkqueue, cl); | |
483 | writel_relaxed(cl->rx_cfg.mode, ssr + SSI_SSR_MODE_REG); | |
484 | omap_port->channels = max(cl->rx_cfg.num_hw_channels, | |
485 | cl->tx_cfg.num_hw_channels); | |
486 | /* Shadow registering for OFF mode */ | |
487 | /* SST */ | |
488 | omap_port->sst.divisor = div; | |
489 | omap_port->sst.frame_size = 31; | |
490 | omap_port->sst.channels = cl->tx_cfg.num_hw_channels; | |
491 | omap_port->sst.arb_mode = cl->tx_cfg.arb_mode; | |
492 | omap_port->sst.mode = cl->tx_cfg.mode; | |
493 | /* SSR */ | |
494 | omap_port->ssr.frame_size = 31; | |
495 | omap_port->ssr.timeout = 0; | |
496 | omap_port->ssr.channels = cl->rx_cfg.num_hw_channels; | |
497 | omap_port->ssr.mode = cl->rx_cfg.mode; | |
498 | out: | |
499 | spin_unlock_bh(&omap_port->lock); | |
500 | pm_runtime_put_sync(omap_port->pdev); | |
501 | ||
502 | return err; | |
503 | } | |
504 | ||
505 | static int ssi_flush(struct hsi_client *cl) | |
506 | { | |
507 | struct hsi_port *port = hsi_get_port(cl); | |
508 | struct omap_ssi_port *omap_port = hsi_port_drvdata(port); | |
509 | struct hsi_controller *ssi = to_hsi_controller(port->device.parent); | |
510 | struct omap_ssi_controller *omap_ssi = hsi_controller_drvdata(ssi); | |
511 | struct hsi_msg *msg; | |
512 | void __iomem *sst = omap_port->sst_base; | |
513 | void __iomem *ssr = omap_port->ssr_base; | |
514 | unsigned int i; | |
515 | u32 err; | |
516 | ||
517 | pm_runtime_get_sync(omap_port->pdev); | |
518 | spin_lock_bh(&omap_port->lock); | |
4bcf7414 SR |
519 | |
520 | /* stop all ssi communication */ | |
521 | pinctrl_pm_select_idle_state(omap_port->pdev); | |
522 | udelay(1); /* wait for racing frames */ | |
523 | ||
b209e047 SR |
524 | /* Stop all DMA transfers */ |
525 | for (i = 0; i < SSI_MAX_GDD_LCH; i++) { | |
526 | msg = omap_ssi->gdd_trn[i].msg; | |
527 | if (!msg || (port != hsi_get_port(msg->cl))) | |
528 | continue; | |
529 | writew_relaxed(0, omap_ssi->gdd + SSI_GDD_CCR_REG(i)); | |
530 | if (msg->ttype == HSI_MSG_READ) | |
531 | pm_runtime_put_sync(omap_port->pdev); | |
532 | omap_ssi->gdd_trn[i].msg = NULL; | |
533 | } | |
534 | /* Flush all SST buffers */ | |
535 | writel_relaxed(0, sst + SSI_SST_BUFSTATE_REG); | |
536 | writel_relaxed(0, sst + SSI_SST_TXSTATE_REG); | |
537 | /* Flush all SSR buffers */ | |
538 | writel_relaxed(0, ssr + SSI_SSR_RXSTATE_REG); | |
539 | writel_relaxed(0, ssr + SSI_SSR_BUFSTATE_REG); | |
540 | /* Flush all errors */ | |
541 | err = readl(ssr + SSI_SSR_ERROR_REG); | |
542 | writel_relaxed(err, ssr + SSI_SSR_ERRORACK_REG); | |
543 | /* Flush break */ | |
544 | writel_relaxed(0, ssr + SSI_SSR_BREAK_REG); | |
545 | /* Clear interrupts */ | |
546 | writel_relaxed(0, omap_ssi->sys + SSI_MPU_ENABLE_REG(port->num, 0)); | |
547 | writel_relaxed(0xffffff00, | |
548 | omap_ssi->sys + SSI_MPU_STATUS_REG(port->num, 0)); | |
549 | writel_relaxed(0, omap_ssi->sys + SSI_GDD_MPU_IRQ_ENABLE_REG); | |
550 | writel(0xff, omap_ssi->sys + SSI_GDD_MPU_IRQ_STATUS_REG); | |
551 | /* Dequeue all pending requests */ | |
552 | for (i = 0; i < omap_port->channels; i++) { | |
553 | /* Release write clocks */ | |
554 | if (!list_empty(&omap_port->txqueue[i])) | |
555 | pm_runtime_put_sync(omap_port->pdev); | |
556 | ssi_flush_queue(&omap_port->txqueue[i], NULL); | |
557 | ssi_flush_queue(&omap_port->rxqueue[i], NULL); | |
558 | } | |
559 | ssi_flush_queue(&omap_port->brkqueue, NULL); | |
4bcf7414 SR |
560 | |
561 | /* Resume SSI communication */ | |
562 | pinctrl_pm_select_default_state(omap_port->pdev); | |
563 | ||
b209e047 SR |
564 | spin_unlock_bh(&omap_port->lock); |
565 | pm_runtime_put_sync(omap_port->pdev); | |
566 | ||
567 | return 0; | |
568 | } | |
569 | ||
570 | static int ssi_start_tx(struct hsi_client *cl) | |
571 | { | |
572 | struct hsi_port *port = hsi_get_port(cl); | |
573 | struct omap_ssi_port *omap_port = hsi_port_drvdata(port); | |
574 | struct hsi_controller *ssi = to_hsi_controller(port->device.parent); | |
575 | struct omap_ssi_controller *omap_ssi = hsi_controller_drvdata(ssi); | |
576 | ||
577 | dev_dbg(&port->device, "Wake out high %d\n", omap_port->wk_refcount); | |
578 | ||
579 | spin_lock_bh(&omap_port->wk_lock); | |
580 | if (omap_port->wk_refcount++) { | |
581 | spin_unlock_bh(&omap_port->wk_lock); | |
582 | return 0; | |
583 | } | |
584 | pm_runtime_get_sync(omap_port->pdev); /* Grab clocks */ | |
585 | writel(SSI_WAKE(0), omap_ssi->sys + SSI_SET_WAKE_REG(port->num)); | |
586 | spin_unlock_bh(&omap_port->wk_lock); | |
587 | ||
588 | return 0; | |
589 | } | |
590 | ||
591 | static int ssi_stop_tx(struct hsi_client *cl) | |
592 | { | |
593 | struct hsi_port *port = hsi_get_port(cl); | |
594 | struct omap_ssi_port *omap_port = hsi_port_drvdata(port); | |
595 | struct hsi_controller *ssi = to_hsi_controller(port->device.parent); | |
596 | struct omap_ssi_controller *omap_ssi = hsi_controller_drvdata(ssi); | |
597 | ||
598 | dev_dbg(&port->device, "Wake out low %d\n", omap_port->wk_refcount); | |
599 | ||
600 | spin_lock_bh(&omap_port->wk_lock); | |
601 | BUG_ON(!omap_port->wk_refcount); | |
602 | if (--omap_port->wk_refcount) { | |
603 | spin_unlock_bh(&omap_port->wk_lock); | |
604 | return 0; | |
605 | } | |
606 | writel(SSI_WAKE(0), omap_ssi->sys + SSI_CLEAR_WAKE_REG(port->num)); | |
607 | pm_runtime_put_sync(omap_port->pdev); /* Release clocks */ | |
608 | spin_unlock_bh(&omap_port->wk_lock); | |
609 | ||
610 | return 0; | |
611 | } | |
612 | ||
613 | static void ssi_transfer(struct omap_ssi_port *omap_port, | |
614 | struct list_head *queue) | |
615 | { | |
616 | struct hsi_msg *msg; | |
617 | int err = -1; | |
618 | ||
619 | spin_lock_bh(&omap_port->lock); | |
620 | while (err < 0) { | |
621 | err = ssi_start_transfer(queue); | |
622 | if (err < 0) { | |
623 | msg = list_first_entry(queue, struct hsi_msg, link); | |
624 | msg->status = HSI_STATUS_ERROR; | |
625 | msg->actual_len = 0; | |
626 | list_del(&msg->link); | |
627 | spin_unlock_bh(&omap_port->lock); | |
628 | msg->complete(msg); | |
629 | spin_lock_bh(&omap_port->lock); | |
630 | } | |
631 | } | |
632 | spin_unlock_bh(&omap_port->lock); | |
633 | } | |
634 | ||
635 | static void ssi_cleanup_queues(struct hsi_client *cl) | |
636 | { | |
637 | struct hsi_port *port = hsi_get_port(cl); | |
638 | struct omap_ssi_port *omap_port = hsi_port_drvdata(port); | |
639 | struct hsi_controller *ssi = to_hsi_controller(port->device.parent); | |
640 | struct omap_ssi_controller *omap_ssi = hsi_controller_drvdata(ssi); | |
641 | struct hsi_msg *msg; | |
642 | unsigned int i; | |
643 | u32 rxbufstate = 0; | |
644 | u32 txbufstate = 0; | |
645 | u32 status = SSI_ERROROCCURED; | |
646 | u32 tmp; | |
647 | ||
648 | ssi_flush_queue(&omap_port->brkqueue, cl); | |
649 | if (list_empty(&omap_port->brkqueue)) | |
650 | status |= SSI_BREAKDETECTED; | |
651 | ||
652 | for (i = 0; i < omap_port->channels; i++) { | |
653 | if (list_empty(&omap_port->txqueue[i])) | |
654 | continue; | |
655 | msg = list_first_entry(&omap_port->txqueue[i], struct hsi_msg, | |
656 | link); | |
657 | if ((msg->cl == cl) && (msg->status == HSI_STATUS_PROCEEDING)) { | |
658 | txbufstate |= (1 << i); | |
659 | status |= SSI_DATAACCEPT(i); | |
660 | /* Release the clocks writes, also GDD ones */ | |
661 | pm_runtime_put_sync(omap_port->pdev); | |
662 | } | |
663 | ssi_flush_queue(&omap_port->txqueue[i], cl); | |
664 | } | |
665 | for (i = 0; i < omap_port->channels; i++) { | |
666 | if (list_empty(&omap_port->rxqueue[i])) | |
667 | continue; | |
668 | msg = list_first_entry(&omap_port->rxqueue[i], struct hsi_msg, | |
669 | link); | |
670 | if ((msg->cl == cl) && (msg->status == HSI_STATUS_PROCEEDING)) { | |
671 | rxbufstate |= (1 << i); | |
672 | status |= SSI_DATAAVAILABLE(i); | |
673 | } | |
674 | ssi_flush_queue(&omap_port->rxqueue[i], cl); | |
675 | /* Check if we keep the error detection interrupt armed */ | |
676 | if (!list_empty(&omap_port->rxqueue[i])) | |
677 | status &= ~SSI_ERROROCCURED; | |
678 | } | |
679 | /* Cleanup write buffers */ | |
680 | tmp = readl(omap_port->sst_base + SSI_SST_BUFSTATE_REG); | |
681 | tmp &= ~txbufstate; | |
682 | writel_relaxed(tmp, omap_port->sst_base + SSI_SST_BUFSTATE_REG); | |
683 | /* Cleanup read buffers */ | |
684 | tmp = readl(omap_port->ssr_base + SSI_SSR_BUFSTATE_REG); | |
685 | tmp &= ~rxbufstate; | |
686 | writel_relaxed(tmp, omap_port->ssr_base + SSI_SSR_BUFSTATE_REG); | |
687 | /* Disarm and ack pending interrupts */ | |
688 | tmp = readl(omap_ssi->sys + SSI_MPU_ENABLE_REG(port->num, 0)); | |
689 | tmp &= ~status; | |
690 | writel_relaxed(tmp, omap_ssi->sys + SSI_MPU_ENABLE_REG(port->num, 0)); | |
691 | writel_relaxed(status, omap_ssi->sys + | |
692 | SSI_MPU_STATUS_REG(port->num, 0)); | |
693 | } | |
694 | ||
695 | static void ssi_cleanup_gdd(struct hsi_controller *ssi, struct hsi_client *cl) | |
696 | { | |
697 | struct omap_ssi_controller *omap_ssi = hsi_controller_drvdata(ssi); | |
698 | struct hsi_port *port = hsi_get_port(cl); | |
699 | struct omap_ssi_port *omap_port = hsi_port_drvdata(port); | |
700 | struct hsi_msg *msg; | |
701 | unsigned int i; | |
702 | u32 val = 0; | |
703 | u32 tmp; | |
704 | ||
705 | for (i = 0; i < SSI_MAX_GDD_LCH; i++) { | |
706 | msg = omap_ssi->gdd_trn[i].msg; | |
707 | if ((!msg) || (msg->cl != cl)) | |
708 | continue; | |
709 | writew_relaxed(0, omap_ssi->gdd + SSI_GDD_CCR_REG(i)); | |
710 | val |= (1 << i); | |
711 | /* | |
712 | * Clock references for write will be handled in | |
713 | * ssi_cleanup_queues | |
714 | */ | |
715 | if (msg->ttype == HSI_MSG_READ) | |
716 | pm_runtime_put_sync(omap_port->pdev); | |
717 | omap_ssi->gdd_trn[i].msg = NULL; | |
718 | } | |
719 | tmp = readl_relaxed(omap_ssi->sys + SSI_GDD_MPU_IRQ_ENABLE_REG); | |
720 | tmp &= ~val; | |
721 | writel_relaxed(tmp, omap_ssi->sys + SSI_GDD_MPU_IRQ_ENABLE_REG); | |
722 | writel(val, omap_ssi->sys + SSI_GDD_MPU_IRQ_STATUS_REG); | |
723 | } | |
724 | ||
725 | static int ssi_set_port_mode(struct omap_ssi_port *omap_port, u32 mode) | |
726 | { | |
727 | writel(mode, omap_port->sst_base + SSI_SST_MODE_REG); | |
728 | writel(mode, omap_port->ssr_base + SSI_SSR_MODE_REG); | |
729 | /* OCP barrier */ | |
730 | mode = readl(omap_port->ssr_base + SSI_SSR_MODE_REG); | |
731 | ||
732 | return 0; | |
733 | } | |
734 | ||
735 | static int ssi_release(struct hsi_client *cl) | |
736 | { | |
737 | struct hsi_port *port = hsi_get_port(cl); | |
738 | struct omap_ssi_port *omap_port = hsi_port_drvdata(port); | |
739 | struct hsi_controller *ssi = to_hsi_controller(port->device.parent); | |
740 | ||
741 | spin_lock_bh(&omap_port->lock); | |
742 | pm_runtime_get_sync(omap_port->pdev); | |
743 | /* Stop all the pending DMA requests for that client */ | |
744 | ssi_cleanup_gdd(ssi, cl); | |
745 | /* Now cleanup all the queues */ | |
746 | ssi_cleanup_queues(cl); | |
747 | pm_runtime_put_sync(omap_port->pdev); | |
748 | /* If it is the last client of the port, do extra checks and cleanup */ | |
749 | if (port->claimed <= 1) { | |
750 | /* | |
751 | * Drop the clock reference for the incoming wake line | |
752 | * if it is still kept high by the other side. | |
753 | */ | |
754 | if (omap_port->wkin_cken) { | |
755 | pm_runtime_put_sync(omap_port->pdev); | |
756 | omap_port->wkin_cken = 0; | |
757 | } | |
758 | pm_runtime_get_sync(omap_port->pdev); | |
759 | /* Stop any SSI TX/RX without a client */ | |
760 | ssi_set_port_mode(omap_port, SSI_MODE_SLEEP); | |
761 | omap_port->sst.mode = SSI_MODE_SLEEP; | |
762 | omap_port->ssr.mode = SSI_MODE_SLEEP; | |
763 | pm_runtime_put_sync(omap_port->pdev); | |
764 | WARN_ON(omap_port->wk_refcount != 0); | |
765 | } | |
766 | spin_unlock_bh(&omap_port->lock); | |
767 | ||
768 | return 0; | |
769 | } | |
770 | ||
771 | ||
772 | ||
773 | static void ssi_error(struct hsi_port *port) | |
774 | { | |
775 | struct omap_ssi_port *omap_port = hsi_port_drvdata(port); | |
776 | struct hsi_controller *ssi = to_hsi_controller(port->device.parent); | |
777 | struct omap_ssi_controller *omap_ssi = hsi_controller_drvdata(ssi); | |
778 | struct hsi_msg *msg; | |
779 | unsigned int i; | |
780 | u32 err; | |
781 | u32 val; | |
782 | u32 tmp; | |
783 | ||
784 | /* ACK error */ | |
785 | err = readl(omap_port->ssr_base + SSI_SSR_ERROR_REG); | |
786 | dev_err(&port->device, "SSI error: 0x%02x\n", err); | |
787 | if (!err) { | |
788 | dev_dbg(&port->device, "spurious SSI error ignored!\n"); | |
789 | return; | |
790 | } | |
791 | spin_lock(&omap_ssi->lock); | |
792 | /* Cancel all GDD read transfers */ | |
793 | for (i = 0, val = 0; i < SSI_MAX_GDD_LCH; i++) { | |
794 | msg = omap_ssi->gdd_trn[i].msg; | |
795 | if ((msg) && (msg->ttype == HSI_MSG_READ)) { | |
796 | writew_relaxed(0, omap_ssi->gdd + SSI_GDD_CCR_REG(i)); | |
797 | val |= (1 << i); | |
798 | omap_ssi->gdd_trn[i].msg = NULL; | |
799 | } | |
800 | } | |
801 | tmp = readl(omap_ssi->sys + SSI_GDD_MPU_IRQ_ENABLE_REG); | |
802 | tmp &= ~val; | |
803 | writel_relaxed(tmp, omap_ssi->sys + SSI_GDD_MPU_IRQ_ENABLE_REG); | |
804 | spin_unlock(&omap_ssi->lock); | |
805 | /* Cancel all PIO read transfers */ | |
806 | spin_lock(&omap_port->lock); | |
807 | tmp = readl(omap_ssi->sys + SSI_MPU_ENABLE_REG(port->num, 0)); | |
808 | tmp &= 0xfeff00ff; /* Disable error & all dataavailable interrupts */ | |
809 | writel_relaxed(tmp, omap_ssi->sys + SSI_MPU_ENABLE_REG(port->num, 0)); | |
810 | /* ACK error */ | |
811 | writel_relaxed(err, omap_port->ssr_base + SSI_SSR_ERRORACK_REG); | |
812 | writel_relaxed(SSI_ERROROCCURED, | |
813 | omap_ssi->sys + SSI_MPU_STATUS_REG(port->num, 0)); | |
814 | /* Signal the error all current pending read requests */ | |
815 | for (i = 0; i < omap_port->channels; i++) { | |
816 | if (list_empty(&omap_port->rxqueue[i])) | |
817 | continue; | |
818 | msg = list_first_entry(&omap_port->rxqueue[i], struct hsi_msg, | |
819 | link); | |
820 | list_del(&msg->link); | |
821 | msg->status = HSI_STATUS_ERROR; | |
822 | spin_unlock(&omap_port->lock); | |
823 | msg->complete(msg); | |
824 | /* Now restart queued reads if any */ | |
825 | ssi_transfer(omap_port, &omap_port->rxqueue[i]); | |
826 | spin_lock(&omap_port->lock); | |
827 | } | |
828 | spin_unlock(&omap_port->lock); | |
829 | } | |
830 | ||
831 | static void ssi_break_complete(struct hsi_port *port) | |
832 | { | |
833 | struct omap_ssi_port *omap_port = hsi_port_drvdata(port); | |
834 | struct hsi_controller *ssi = to_hsi_controller(port->device.parent); | |
835 | struct omap_ssi_controller *omap_ssi = hsi_controller_drvdata(ssi); | |
836 | struct hsi_msg *msg; | |
837 | struct hsi_msg *tmp; | |
838 | u32 val; | |
839 | ||
840 | dev_dbg(&port->device, "HWBREAK received\n"); | |
841 | ||
842 | spin_lock(&omap_port->lock); | |
843 | val = readl(omap_ssi->sys + SSI_MPU_ENABLE_REG(port->num, 0)); | |
844 | val &= ~SSI_BREAKDETECTED; | |
845 | writel_relaxed(val, omap_ssi->sys + SSI_MPU_ENABLE_REG(port->num, 0)); | |
846 | writel_relaxed(0, omap_port->ssr_base + SSI_SSR_BREAK_REG); | |
847 | writel(SSI_BREAKDETECTED, | |
848 | omap_ssi->sys + SSI_MPU_STATUS_REG(port->num, 0)); | |
849 | spin_unlock(&omap_port->lock); | |
850 | ||
851 | list_for_each_entry_safe(msg, tmp, &omap_port->brkqueue, link) { | |
852 | msg->status = HSI_STATUS_COMPLETED; | |
853 | spin_lock(&omap_port->lock); | |
854 | list_del(&msg->link); | |
855 | spin_unlock(&omap_port->lock); | |
856 | msg->complete(msg); | |
857 | } | |
858 | ||
859 | } | |
860 | ||
861 | static void ssi_pio_complete(struct hsi_port *port, struct list_head *queue) | |
862 | { | |
863 | struct hsi_controller *ssi = to_hsi_controller(port->device.parent); | |
864 | struct omap_ssi_controller *omap_ssi = hsi_controller_drvdata(ssi); | |
865 | struct omap_ssi_port *omap_port = hsi_port_drvdata(port); | |
866 | struct hsi_msg *msg; | |
867 | u32 *buf; | |
868 | u32 reg; | |
869 | u32 val; | |
870 | ||
871 | spin_lock(&omap_port->lock); | |
872 | msg = list_first_entry(queue, struct hsi_msg, link); | |
873 | if ((!msg->sgt.nents) || (!msg->sgt.sgl->length)) { | |
874 | msg->actual_len = 0; | |
875 | msg->status = HSI_STATUS_PENDING; | |
876 | } | |
877 | if (msg->ttype == HSI_MSG_WRITE) | |
878 | val = SSI_DATAACCEPT(msg->channel); | |
879 | else | |
880 | val = SSI_DATAAVAILABLE(msg->channel); | |
881 | if (msg->status == HSI_STATUS_PROCEEDING) { | |
882 | buf = sg_virt(msg->sgt.sgl) + msg->actual_len; | |
883 | if (msg->ttype == HSI_MSG_WRITE) | |
884 | writel(*buf, omap_port->sst_base + | |
885 | SSI_SST_BUFFER_CH_REG(msg->channel)); | |
886 | else | |
887 | *buf = readl(omap_port->ssr_base + | |
888 | SSI_SSR_BUFFER_CH_REG(msg->channel)); | |
889 | dev_dbg(&port->device, "ch %d ttype %d 0x%08x\n", msg->channel, | |
890 | msg->ttype, *buf); | |
891 | msg->actual_len += sizeof(*buf); | |
892 | if (msg->actual_len >= msg->sgt.sgl->length) | |
893 | msg->status = HSI_STATUS_COMPLETED; | |
894 | /* | |
895 | * Wait for the last written frame to be really sent before | |
896 | * we call the complete callback | |
897 | */ | |
898 | if ((msg->status == HSI_STATUS_PROCEEDING) || | |
899 | ((msg->status == HSI_STATUS_COMPLETED) && | |
900 | (msg->ttype == HSI_MSG_WRITE))) { | |
901 | writel(val, omap_ssi->sys + | |
902 | SSI_MPU_STATUS_REG(port->num, 0)); | |
903 | spin_unlock(&omap_port->lock); | |
904 | ||
905 | return; | |
906 | } | |
907 | ||
908 | } | |
909 | /* Transfer completed at this point */ | |
910 | reg = readl(omap_ssi->sys + SSI_MPU_ENABLE_REG(port->num, 0)); | |
911 | if (msg->ttype == HSI_MSG_WRITE) { | |
912 | /* Release clocks for write transfer */ | |
913 | pm_runtime_put_sync(omap_port->pdev); | |
914 | } | |
915 | reg &= ~val; | |
916 | writel_relaxed(reg, omap_ssi->sys + SSI_MPU_ENABLE_REG(port->num, 0)); | |
917 | writel_relaxed(val, omap_ssi->sys + SSI_MPU_STATUS_REG(port->num, 0)); | |
918 | list_del(&msg->link); | |
919 | spin_unlock(&omap_port->lock); | |
920 | msg->complete(msg); | |
921 | ssi_transfer(omap_port, queue); | |
922 | } | |
923 | ||
924 | static void ssi_pio_tasklet(unsigned long ssi_port) | |
925 | { | |
926 | struct hsi_port *port = (struct hsi_port *)ssi_port; | |
927 | struct hsi_controller *ssi = to_hsi_controller(port->device.parent); | |
928 | struct omap_ssi_port *omap_port = hsi_port_drvdata(port); | |
929 | struct omap_ssi_controller *omap_ssi = hsi_controller_drvdata(ssi); | |
930 | void __iomem *sys = omap_ssi->sys; | |
931 | unsigned int ch; | |
932 | u32 status_reg; | |
933 | ||
934 | pm_runtime_get_sync(omap_port->pdev); | |
935 | status_reg = readl(sys + SSI_MPU_STATUS_REG(port->num, 0)); | |
936 | status_reg &= readl(sys + SSI_MPU_ENABLE_REG(port->num, 0)); | |
937 | ||
938 | for (ch = 0; ch < omap_port->channels; ch++) { | |
939 | if (status_reg & SSI_DATAACCEPT(ch)) | |
940 | ssi_pio_complete(port, &omap_port->txqueue[ch]); | |
941 | if (status_reg & SSI_DATAAVAILABLE(ch)) | |
942 | ssi_pio_complete(port, &omap_port->rxqueue[ch]); | |
943 | } | |
944 | if (status_reg & SSI_BREAKDETECTED) | |
945 | ssi_break_complete(port); | |
946 | if (status_reg & SSI_ERROROCCURED) | |
947 | ssi_error(port); | |
948 | ||
949 | status_reg = readl(sys + SSI_MPU_STATUS_REG(port->num, 0)); | |
950 | status_reg &= readl(sys + SSI_MPU_ENABLE_REG(port->num, 0)); | |
951 | pm_runtime_put_sync(omap_port->pdev); | |
952 | ||
953 | if (status_reg) | |
954 | tasklet_hi_schedule(&omap_port->pio_tasklet); | |
955 | else | |
956 | enable_irq(omap_port->irq); | |
957 | } | |
958 | ||
959 | static irqreturn_t ssi_pio_isr(int irq, void *port) | |
960 | { | |
961 | struct omap_ssi_port *omap_port = hsi_port_drvdata(port); | |
962 | ||
963 | tasklet_hi_schedule(&omap_port->pio_tasklet); | |
964 | disable_irq_nosync(irq); | |
965 | ||
966 | return IRQ_HANDLED; | |
967 | } | |
968 | ||
969 | static void ssi_wake_tasklet(unsigned long ssi_port) | |
970 | { | |
971 | struct hsi_port *port = (struct hsi_port *)ssi_port; | |
972 | struct hsi_controller *ssi = to_hsi_controller(port->device.parent); | |
973 | struct omap_ssi_port *omap_port = hsi_port_drvdata(port); | |
974 | struct omap_ssi_controller *omap_ssi = hsi_controller_drvdata(ssi); | |
975 | ||
976 | if (ssi_wakein(port)) { | |
977 | /** | |
978 | * We can have a quick High-Low-High transition in the line. | |
979 | * In such a case if we have long interrupt latencies, | |
980 | * we can miss the low event or get twice a high event. | |
981 | * This workaround will avoid breaking the clock reference | |
982 | * count when such a situation ocurrs. | |
983 | */ | |
984 | spin_lock(&omap_port->lock); | |
985 | if (!omap_port->wkin_cken) { | |
986 | omap_port->wkin_cken = 1; | |
987 | pm_runtime_get_sync(omap_port->pdev); | |
988 | } | |
989 | spin_unlock(&omap_port->lock); | |
990 | dev_dbg(&ssi->device, "Wake in high\n"); | |
991 | if (omap_port->wktest) { /* FIXME: HACK ! To be removed */ | |
992 | writel(SSI_WAKE(0), | |
993 | omap_ssi->sys + SSI_SET_WAKE_REG(port->num)); | |
994 | } | |
995 | hsi_event(port, HSI_EVENT_START_RX); | |
996 | } else { | |
997 | dev_dbg(&ssi->device, "Wake in low\n"); | |
998 | if (omap_port->wktest) { /* FIXME: HACK ! To be removed */ | |
999 | writel(SSI_WAKE(0), | |
1000 | omap_ssi->sys + SSI_CLEAR_WAKE_REG(port->num)); | |
1001 | } | |
1002 | hsi_event(port, HSI_EVENT_STOP_RX); | |
1003 | spin_lock(&omap_port->lock); | |
1004 | if (omap_port->wkin_cken) { | |
1005 | pm_runtime_put_sync(omap_port->pdev); | |
1006 | omap_port->wkin_cken = 0; | |
1007 | } | |
1008 | spin_unlock(&omap_port->lock); | |
1009 | } | |
1010 | } | |
1011 | ||
1012 | static irqreturn_t ssi_wake_isr(int irq __maybe_unused, void *ssi_port) | |
1013 | { | |
1014 | struct omap_ssi_port *omap_port = hsi_port_drvdata(ssi_port); | |
1015 | ||
1016 | tasklet_hi_schedule(&omap_port->wake_tasklet); | |
1017 | ||
1018 | return IRQ_HANDLED; | |
1019 | } | |
1020 | ||
0845e1f2 | 1021 | static int ssi_port_irq(struct hsi_port *port, |
b209e047 SR |
1022 | struct platform_device *pd) |
1023 | { | |
1024 | struct omap_ssi_port *omap_port = hsi_port_drvdata(port); | |
1025 | int err; | |
1026 | ||
b74d4954 AU |
1027 | err = platform_get_irq(pd, 0); |
1028 | if (err < 0) { | |
b209e047 | 1029 | dev_err(&port->device, "Port IRQ resource missing\n"); |
b74d4954 | 1030 | return err; |
b209e047 | 1031 | } |
b74d4954 | 1032 | omap_port->irq = err; |
b209e047 SR |
1033 | tasklet_init(&omap_port->pio_tasklet, ssi_pio_tasklet, |
1034 | (unsigned long)port); | |
1035 | err = devm_request_irq(&port->device, omap_port->irq, ssi_pio_isr, | |
1036 | 0, "mpu_irq0", port); | |
1037 | if (err < 0) | |
1038 | dev_err(&port->device, "Request IRQ %d failed (%d)\n", | |
1039 | omap_port->irq, err); | |
1040 | return err; | |
1041 | } | |
1042 | ||
0845e1f2 | 1043 | static int ssi_wake_irq(struct hsi_port *port, |
b209e047 SR |
1044 | struct platform_device *pd) |
1045 | { | |
1046 | struct omap_ssi_port *omap_port = hsi_port_drvdata(port); | |
1047 | int cawake_irq; | |
1048 | int err; | |
1049 | ||
73e6ce09 | 1050 | if (!omap_port->wake_gpio) { |
b209e047 SR |
1051 | omap_port->wake_irq = -1; |
1052 | return 0; | |
1053 | } | |
1054 | ||
73e6ce09 | 1055 | cawake_irq = gpiod_to_irq(omap_port->wake_gpio); |
b209e047 SR |
1056 | |
1057 | omap_port->wake_irq = cawake_irq; | |
1058 | tasklet_init(&omap_port->wake_tasklet, ssi_wake_tasklet, | |
1059 | (unsigned long)port); | |
1060 | err = devm_request_irq(&port->device, cawake_irq, ssi_wake_isr, | |
1061 | IRQF_TRIGGER_RISING | IRQF_TRIGGER_FALLING, | |
1062 | "cawake", port); | |
1063 | if (err < 0) | |
1064 | dev_err(&port->device, "Request Wake in IRQ %d failed %d\n", | |
1065 | cawake_irq, err); | |
1066 | err = enable_irq_wake(cawake_irq); | |
1067 | if (err < 0) | |
1068 | dev_err(&port->device, "Enable wake on the wakeline in irq %d failed %d\n", | |
1069 | cawake_irq, err); | |
1070 | ||
1071 | return err; | |
1072 | } | |
1073 | ||
0845e1f2 | 1074 | static void ssi_queues_init(struct omap_ssi_port *omap_port) |
b209e047 SR |
1075 | { |
1076 | unsigned int ch; | |
1077 | ||
1078 | for (ch = 0; ch < SSI_MAX_CHANNELS; ch++) { | |
1079 | INIT_LIST_HEAD(&omap_port->txqueue[ch]); | |
1080 | INIT_LIST_HEAD(&omap_port->rxqueue[ch]); | |
1081 | } | |
1082 | INIT_LIST_HEAD(&omap_port->brkqueue); | |
1083 | } | |
1084 | ||
0845e1f2 | 1085 | static int ssi_port_get_iomem(struct platform_device *pd, |
b209e047 SR |
1086 | const char *name, void __iomem **pbase, dma_addr_t *phy) |
1087 | { | |
1088 | struct hsi_port *port = platform_get_drvdata(pd); | |
1089 | struct resource *mem; | |
1090 | struct resource *ioarea; | |
1091 | void __iomem *base; | |
1092 | ||
1093 | mem = platform_get_resource_byname(pd, IORESOURCE_MEM, name); | |
1094 | if (!mem) { | |
1095 | dev_err(&pd->dev, "IO memory region missing (%s)\n", name); | |
1096 | return -ENXIO; | |
1097 | } | |
1098 | ioarea = devm_request_mem_region(&port->device, mem->start, | |
1099 | resource_size(mem), dev_name(&pd->dev)); | |
1100 | if (!ioarea) { | |
1101 | dev_err(&pd->dev, "%s IO memory region request failed\n", | |
1102 | mem->name); | |
1103 | return -ENXIO; | |
1104 | } | |
1105 | base = devm_ioremap(&port->device, mem->start, resource_size(mem)); | |
1106 | if (!base) { | |
1107 | dev_err(&pd->dev, "%s IO remap failed\n", mem->name); | |
1108 | return -ENXIO; | |
1109 | } | |
1110 | *pbase = base; | |
1111 | ||
1112 | if (phy) | |
1113 | *phy = mem->start; | |
1114 | ||
1115 | return 0; | |
1116 | } | |
1117 | ||
0845e1f2 | 1118 | static int ssi_port_probe(struct platform_device *pd) |
b209e047 SR |
1119 | { |
1120 | struct device_node *np = pd->dev.of_node; | |
1121 | struct hsi_port *port; | |
1122 | struct omap_ssi_port *omap_port; | |
1123 | struct hsi_controller *ssi = dev_get_drvdata(pd->dev.parent); | |
1124 | struct omap_ssi_controller *omap_ssi = hsi_controller_drvdata(ssi); | |
73e6ce09 | 1125 | struct gpio_desc *cawake_gpio = NULL; |
b209e047 SR |
1126 | u32 port_id; |
1127 | int err; | |
1128 | ||
1129 | dev_dbg(&pd->dev, "init ssi port...\n"); | |
1130 | ||
b209e047 SR |
1131 | if (!ssi->port || !omap_ssi->port) { |
1132 | dev_err(&pd->dev, "ssi controller not initialized!\n"); | |
1133 | err = -ENODEV; | |
1134 | goto error; | |
1135 | } | |
1136 | ||
1137 | /* get id of first uninitialized port in controller */ | |
1138 | for (port_id = 0; port_id < ssi->num_ports && omap_ssi->port[port_id]; | |
1139 | port_id++) | |
1140 | ; | |
1141 | ||
1142 | if (port_id >= ssi->num_ports) { | |
1143 | dev_err(&pd->dev, "port id out of range!\n"); | |
1144 | err = -ENODEV; | |
1145 | goto error; | |
1146 | } | |
1147 | ||
1148 | port = ssi->port[port_id]; | |
1149 | ||
1150 | if (!np) { | |
1151 | dev_err(&pd->dev, "missing device tree data\n"); | |
1152 | err = -EINVAL; | |
1153 | goto error; | |
1154 | } | |
1155 | ||
73e6ce09 SR |
1156 | cawake_gpio = devm_gpiod_get(&pd->dev, "ti,ssi-cawake", GPIOD_IN); |
1157 | if (IS_ERR(cawake_gpio)) { | |
1158 | err = PTR_ERR(cawake_gpio); | |
1159 | dev_err(&pd->dev, "couldn't get cawake gpio (err=%d)!\n", err); | |
b209e047 SR |
1160 | goto error; |
1161 | } | |
1162 | ||
1163 | omap_port = devm_kzalloc(&port->device, sizeof(*omap_port), GFP_KERNEL); | |
1164 | if (!omap_port) { | |
1165 | err = -ENOMEM; | |
1166 | goto error; | |
1167 | } | |
1168 | omap_port->wake_gpio = cawake_gpio; | |
1169 | omap_port->pdev = &pd->dev; | |
1170 | omap_port->port_id = port_id; | |
1171 | ||
1172 | /* initialize HSI port */ | |
1173 | port->async = ssi_async; | |
1174 | port->setup = ssi_setup; | |
1175 | port->flush = ssi_flush; | |
1176 | port->start_tx = ssi_start_tx; | |
1177 | port->stop_tx = ssi_stop_tx; | |
1178 | port->release = ssi_release; | |
1179 | hsi_port_set_drvdata(port, omap_port); | |
1180 | omap_ssi->port[port_id] = omap_port; | |
1181 | ||
1182 | platform_set_drvdata(pd, port); | |
1183 | ||
1184 | err = ssi_port_get_iomem(pd, "tx", &omap_port->sst_base, | |
1185 | &omap_port->sst_dma); | |
1186 | if (err < 0) | |
1187 | goto error; | |
1188 | err = ssi_port_get_iomem(pd, "rx", &omap_port->ssr_base, | |
1189 | &omap_port->ssr_dma); | |
1190 | if (err < 0) | |
1191 | goto error; | |
1192 | ||
1193 | err = ssi_port_irq(port, pd); | |
1194 | if (err < 0) | |
1195 | goto error; | |
1196 | err = ssi_wake_irq(port, pd); | |
1197 | if (err < 0) | |
1198 | goto error; | |
1199 | ||
1200 | ssi_queues_init(omap_port); | |
1201 | spin_lock_init(&omap_port->lock); | |
1202 | spin_lock_init(&omap_port->wk_lock); | |
1203 | omap_port->dev = &port->device; | |
1204 | ||
1205 | pm_runtime_irq_safe(omap_port->pdev); | |
1206 | pm_runtime_enable(omap_port->pdev); | |
1207 | ||
1208 | #ifdef CONFIG_DEBUG_FS | |
1209 | err = ssi_debug_add_port(omap_port, omap_ssi->dir); | |
1210 | if (err < 0) { | |
1211 | pm_runtime_disable(omap_port->pdev); | |
1212 | goto error; | |
1213 | } | |
1214 | #endif | |
1215 | ||
1216 | hsi_add_clients_from_dt(port, np); | |
1217 | ||
73e6ce09 | 1218 | dev_info(&pd->dev, "ssi port %u successfully initialized\n", port_id); |
b209e047 SR |
1219 | |
1220 | return 0; | |
1221 | ||
1222 | error: | |
1223 | return err; | |
1224 | } | |
1225 | ||
0845e1f2 | 1226 | static int ssi_port_remove(struct platform_device *pd) |
b209e047 SR |
1227 | { |
1228 | struct hsi_port *port = platform_get_drvdata(pd); | |
1229 | struct omap_ssi_port *omap_port = hsi_port_drvdata(port); | |
1230 | struct hsi_controller *ssi = to_hsi_controller(port->device.parent); | |
1231 | struct omap_ssi_controller *omap_ssi = hsi_controller_drvdata(ssi); | |
1232 | ||
1233 | #ifdef CONFIG_DEBUG_FS | |
1234 | ssi_debug_remove_port(port); | |
1235 | #endif | |
1236 | ||
1237 | hsi_port_unregister_clients(port); | |
1238 | ||
1239 | tasklet_kill(&omap_port->wake_tasklet); | |
1240 | tasklet_kill(&omap_port->pio_tasklet); | |
1241 | ||
1242 | port->async = hsi_dummy_msg; | |
1243 | port->setup = hsi_dummy_cl; | |
1244 | port->flush = hsi_dummy_cl; | |
1245 | port->start_tx = hsi_dummy_cl; | |
1246 | port->stop_tx = hsi_dummy_cl; | |
1247 | port->release = hsi_dummy_cl; | |
1248 | ||
1249 | omap_ssi->port[omap_port->port_id] = NULL; | |
1250 | platform_set_drvdata(pd, NULL); | |
1251 | pm_runtime_disable(&pd->dev); | |
1252 | ||
1253 | return 0; | |
1254 | } | |
1255 | ||
c2f90a46 AB |
1256 | static int ssi_restore_divisor(struct omap_ssi_port *omap_port) |
1257 | { | |
1258 | writel_relaxed(omap_port->sst.divisor, | |
1259 | omap_port->sst_base + SSI_SST_DIVISOR_REG); | |
1260 | ||
1261 | return 0; | |
1262 | } | |
1263 | ||
1264 | void omap_ssi_port_update_fclk(struct hsi_controller *ssi, | |
1265 | struct omap_ssi_port *omap_port) | |
1266 | { | |
1267 | /* update divisor */ | |
1268 | u32 div = ssi_calculate_div(ssi); | |
1269 | omap_port->sst.divisor = div; | |
1270 | ssi_restore_divisor(omap_port); | |
1271 | } | |
1272 | ||
96a1c18a | 1273 | #ifdef CONFIG_PM |
b209e047 SR |
1274 | static int ssi_save_port_ctx(struct omap_ssi_port *omap_port) |
1275 | { | |
1276 | struct hsi_port *port = to_hsi_port(omap_port->dev); | |
1277 | struct hsi_controller *ssi = to_hsi_controller(port->device.parent); | |
1278 | struct omap_ssi_controller *omap_ssi = hsi_controller_drvdata(ssi); | |
1279 | ||
1280 | omap_port->sys_mpu_enable = readl(omap_ssi->sys + | |
1281 | SSI_MPU_ENABLE_REG(port->num, 0)); | |
1282 | ||
1283 | return 0; | |
1284 | } | |
1285 | ||
1286 | static int ssi_restore_port_ctx(struct omap_ssi_port *omap_port) | |
1287 | { | |
1288 | struct hsi_port *port = to_hsi_port(omap_port->dev); | |
1289 | struct hsi_controller *ssi = to_hsi_controller(port->device.parent); | |
1290 | struct omap_ssi_controller *omap_ssi = hsi_controller_drvdata(ssi); | |
1291 | void __iomem *base; | |
1292 | ||
1293 | writel_relaxed(omap_port->sys_mpu_enable, | |
1294 | omap_ssi->sys + SSI_MPU_ENABLE_REG(port->num, 0)); | |
1295 | ||
1296 | /* SST context */ | |
1297 | base = omap_port->sst_base; | |
1298 | writel_relaxed(omap_port->sst.frame_size, base + SSI_SST_FRAMESIZE_REG); | |
1299 | writel_relaxed(omap_port->sst.channels, base + SSI_SST_CHANNELS_REG); | |
1300 | writel_relaxed(omap_port->sst.arb_mode, base + SSI_SST_ARBMODE_REG); | |
1301 | ||
1302 | /* SSR context */ | |
1303 | base = omap_port->ssr_base; | |
1304 | writel_relaxed(omap_port->ssr.frame_size, base + SSI_SSR_FRAMESIZE_REG); | |
1305 | writel_relaxed(omap_port->ssr.channels, base + SSI_SSR_CHANNELS_REG); | |
1306 | writel_relaxed(omap_port->ssr.timeout, base + SSI_SSR_TIMEOUT_REG); | |
1307 | ||
1308 | return 0; | |
1309 | } | |
1310 | ||
1311 | static int ssi_restore_port_mode(struct omap_ssi_port *omap_port) | |
1312 | { | |
1313 | u32 mode; | |
1314 | ||
1315 | writel_relaxed(omap_port->sst.mode, | |
1316 | omap_port->sst_base + SSI_SST_MODE_REG); | |
1317 | writel_relaxed(omap_port->ssr.mode, | |
1318 | omap_port->ssr_base + SSI_SSR_MODE_REG); | |
1319 | /* OCP barrier */ | |
1320 | mode = readl(omap_port->ssr_base + SSI_SSR_MODE_REG); | |
1321 | ||
1322 | return 0; | |
1323 | } | |
1324 | ||
b209e047 SR |
1325 | static int omap_ssi_port_runtime_suspend(struct device *dev) |
1326 | { | |
1327 | struct hsi_port *port = dev_get_drvdata(dev); | |
1328 | struct omap_ssi_port *omap_port = hsi_port_drvdata(port); | |
1329 | struct hsi_controller *ssi = to_hsi_controller(port->device.parent); | |
1330 | struct omap_ssi_controller *omap_ssi = hsi_controller_drvdata(ssi); | |
1331 | ||
1332 | dev_dbg(dev, "port runtime suspend!\n"); | |
1333 | ||
1334 | ssi_set_port_mode(omap_port, SSI_MODE_SLEEP); | |
1335 | if (omap_ssi->get_loss) | |
1336 | omap_port->loss_count = | |
1337 | omap_ssi->get_loss(ssi->device.parent); | |
1338 | ssi_save_port_ctx(omap_port); | |
1339 | ||
1340 | return 0; | |
1341 | } | |
1342 | ||
1343 | static int omap_ssi_port_runtime_resume(struct device *dev) | |
1344 | { | |
1345 | struct hsi_port *port = dev_get_drvdata(dev); | |
1346 | struct omap_ssi_port *omap_port = hsi_port_drvdata(port); | |
1347 | struct hsi_controller *ssi = to_hsi_controller(port->device.parent); | |
1348 | struct omap_ssi_controller *omap_ssi = hsi_controller_drvdata(ssi); | |
1349 | ||
1350 | dev_dbg(dev, "port runtime resume!\n"); | |
1351 | ||
1352 | if ((omap_ssi->get_loss) && (omap_port->loss_count == | |
1353 | omap_ssi->get_loss(ssi->device.parent))) | |
1354 | goto mode; /* We always need to restore the mode & TX divisor */ | |
1355 | ||
1356 | ssi_restore_port_ctx(omap_port); | |
1357 | ||
1358 | mode: | |
1359 | ssi_restore_divisor(omap_port); | |
1360 | ssi_restore_port_mode(omap_port); | |
1361 | ||
1362 | return 0; | |
1363 | } | |
1364 | ||
1365 | static const struct dev_pm_ops omap_ssi_port_pm_ops = { | |
1366 | SET_RUNTIME_PM_OPS(omap_ssi_port_runtime_suspend, | |
1367 | omap_ssi_port_runtime_resume, NULL) | |
1368 | }; | |
1369 | ||
1370 | #define DEV_PM_OPS (&omap_ssi_port_pm_ops) | |
1371 | #else | |
1372 | #define DEV_PM_OPS NULL | |
1373 | #endif | |
1374 | ||
1375 | ||
1376 | #ifdef CONFIG_OF | |
1377 | static const struct of_device_id omap_ssi_port_of_match[] = { | |
1378 | { .compatible = "ti,omap3-ssi-port", }, | |
1379 | {}, | |
1380 | }; | |
1381 | MODULE_DEVICE_TABLE(of, omap_ssi_port_of_match); | |
1382 | #else | |
1383 | #define omap_ssi_port_of_match NULL | |
1384 | #endif | |
1385 | ||
0fae1989 | 1386 | struct platform_driver ssi_port_pdriver = { |
0845e1f2 SR |
1387 | .probe = ssi_port_probe, |
1388 | .remove = ssi_port_remove, | |
b209e047 SR |
1389 | .driver = { |
1390 | .name = "omap_ssi_port", | |
b209e047 SR |
1391 | .of_match_table = omap_ssi_port_of_match, |
1392 | .pm = DEV_PM_OPS, | |
1393 | }, | |
1394 | }; |