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b209e047 SR |
1 | /* OMAP SSI 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/compiler.h> | |
24 | #include <linux/err.h> | |
25 | #include <linux/ioport.h> | |
26 | #include <linux/io.h> | |
27 | #include <linux/gpio.h> | |
28 | #include <linux/clk.h> | |
29 | #include <linux/device.h> | |
30 | #include <linux/platform_device.h> | |
31 | #include <linux/dma-mapping.h> | |
32 | #include <linux/dmaengine.h> | |
33 | #include <linux/delay.h> | |
34 | #include <linux/seq_file.h> | |
35 | #include <linux/scatterlist.h> | |
36 | #include <linux/interrupt.h> | |
37 | #include <linux/spinlock.h> | |
38 | #include <linux/debugfs.h> | |
39 | #include <linux/pm_runtime.h> | |
40 | #include <linux/of_platform.h> | |
41 | #include <linux/hsi/hsi.h> | |
42 | #include <linux/idr.h> | |
43 | ||
44 | #include "omap_ssi_regs.h" | |
45 | #include "omap_ssi.h" | |
46 | ||
47 | /* For automatically allocated device IDs */ | |
48 | static DEFINE_IDA(platform_omap_ssi_ida); | |
49 | ||
50 | #ifdef CONFIG_DEBUG_FS | |
51 | static int ssi_debug_show(struct seq_file *m, void *p __maybe_unused) | |
52 | { | |
53 | struct hsi_controller *ssi = m->private; | |
54 | struct omap_ssi_controller *omap_ssi = hsi_controller_drvdata(ssi); | |
55 | void __iomem *sys = omap_ssi->sys; | |
56 | ||
57 | pm_runtime_get_sync(ssi->device.parent); | |
58 | seq_printf(m, "REVISION\t: 0x%08x\n", readl(sys + SSI_REVISION_REG)); | |
59 | seq_printf(m, "SYSCONFIG\t: 0x%08x\n", readl(sys + SSI_SYSCONFIG_REG)); | |
60 | seq_printf(m, "SYSSTATUS\t: 0x%08x\n", readl(sys + SSI_SYSSTATUS_REG)); | |
61 | pm_runtime_put_sync(ssi->device.parent); | |
62 | ||
63 | return 0; | |
64 | } | |
65 | ||
66 | static int ssi_debug_gdd_show(struct seq_file *m, void *p __maybe_unused) | |
67 | { | |
68 | struct hsi_controller *ssi = m->private; | |
69 | struct omap_ssi_controller *omap_ssi = hsi_controller_drvdata(ssi); | |
70 | void __iomem *gdd = omap_ssi->gdd; | |
71 | void __iomem *sys = omap_ssi->sys; | |
72 | int lch; | |
73 | ||
74 | pm_runtime_get_sync(ssi->device.parent); | |
75 | ||
76 | seq_printf(m, "GDD_MPU_STATUS\t: 0x%08x\n", | |
77 | readl(sys + SSI_GDD_MPU_IRQ_STATUS_REG)); | |
78 | seq_printf(m, "GDD_MPU_ENABLE\t: 0x%08x\n\n", | |
79 | readl(sys + SSI_GDD_MPU_IRQ_ENABLE_REG)); | |
80 | seq_printf(m, "HW_ID\t\t: 0x%08x\n", | |
81 | readl(gdd + SSI_GDD_HW_ID_REG)); | |
82 | seq_printf(m, "PPORT_ID\t: 0x%08x\n", | |
83 | readl(gdd + SSI_GDD_PPORT_ID_REG)); | |
84 | seq_printf(m, "MPORT_ID\t: 0x%08x\n", | |
85 | readl(gdd + SSI_GDD_MPORT_ID_REG)); | |
86 | seq_printf(m, "TEST\t\t: 0x%08x\n", | |
87 | readl(gdd + SSI_GDD_TEST_REG)); | |
88 | seq_printf(m, "GCR\t\t: 0x%08x\n", | |
89 | readl(gdd + SSI_GDD_GCR_REG)); | |
90 | ||
91 | for (lch = 0; lch < SSI_MAX_GDD_LCH; lch++) { | |
92 | seq_printf(m, "\nGDD LCH %d\n=========\n", lch); | |
93 | seq_printf(m, "CSDP\t\t: 0x%04x\n", | |
94 | readw(gdd + SSI_GDD_CSDP_REG(lch))); | |
95 | seq_printf(m, "CCR\t\t: 0x%04x\n", | |
96 | readw(gdd + SSI_GDD_CCR_REG(lch))); | |
97 | seq_printf(m, "CICR\t\t: 0x%04x\n", | |
98 | readw(gdd + SSI_GDD_CICR_REG(lch))); | |
99 | seq_printf(m, "CSR\t\t: 0x%04x\n", | |
100 | readw(gdd + SSI_GDD_CSR_REG(lch))); | |
101 | seq_printf(m, "CSSA\t\t: 0x%08x\n", | |
102 | readl(gdd + SSI_GDD_CSSA_REG(lch))); | |
103 | seq_printf(m, "CDSA\t\t: 0x%08x\n", | |
104 | readl(gdd + SSI_GDD_CDSA_REG(lch))); | |
105 | seq_printf(m, "CEN\t\t: 0x%04x\n", | |
106 | readw(gdd + SSI_GDD_CEN_REG(lch))); | |
107 | seq_printf(m, "CSAC\t\t: 0x%04x\n", | |
108 | readw(gdd + SSI_GDD_CSAC_REG(lch))); | |
109 | seq_printf(m, "CDAC\t\t: 0x%04x\n", | |
110 | readw(gdd + SSI_GDD_CDAC_REG(lch))); | |
111 | seq_printf(m, "CLNK_CTRL\t: 0x%04x\n", | |
112 | readw(gdd + SSI_GDD_CLNK_CTRL_REG(lch))); | |
113 | } | |
114 | ||
115 | pm_runtime_put_sync(ssi->device.parent); | |
116 | ||
117 | return 0; | |
118 | } | |
119 | ||
120 | static int ssi_regs_open(struct inode *inode, struct file *file) | |
121 | { | |
122 | return single_open(file, ssi_debug_show, inode->i_private); | |
123 | } | |
124 | ||
125 | static int ssi_gdd_regs_open(struct inode *inode, struct file *file) | |
126 | { | |
127 | return single_open(file, ssi_debug_gdd_show, inode->i_private); | |
128 | } | |
129 | ||
130 | static const struct file_operations ssi_regs_fops = { | |
131 | .open = ssi_regs_open, | |
132 | .read = seq_read, | |
133 | .llseek = seq_lseek, | |
134 | .release = single_release, | |
135 | }; | |
136 | ||
137 | static const struct file_operations ssi_gdd_regs_fops = { | |
138 | .open = ssi_gdd_regs_open, | |
139 | .read = seq_read, | |
140 | .llseek = seq_lseek, | |
141 | .release = single_release, | |
142 | }; | |
143 | ||
144 | static int __init ssi_debug_add_ctrl(struct hsi_controller *ssi) | |
145 | { | |
146 | struct omap_ssi_controller *omap_ssi = hsi_controller_drvdata(ssi); | |
147 | struct dentry *dir; | |
148 | ||
149 | /* SSI controller */ | |
150 | omap_ssi->dir = debugfs_create_dir(dev_name(&ssi->device), NULL); | |
3fd276e9 WY |
151 | if (!omap_ssi->dir) |
152 | return -ENOMEM; | |
b209e047 SR |
153 | |
154 | debugfs_create_file("regs", S_IRUGO, omap_ssi->dir, ssi, | |
155 | &ssi_regs_fops); | |
156 | /* SSI GDD (DMA) */ | |
157 | dir = debugfs_create_dir("gdd", omap_ssi->dir); | |
3fd276e9 | 158 | if (!dir) |
b209e047 SR |
159 | goto rback; |
160 | debugfs_create_file("regs", S_IRUGO, dir, ssi, &ssi_gdd_regs_fops); | |
161 | ||
162 | return 0; | |
163 | rback: | |
164 | debugfs_remove_recursive(omap_ssi->dir); | |
165 | ||
3fd276e9 | 166 | return -ENOMEM; |
b209e047 SR |
167 | } |
168 | ||
169 | static void ssi_debug_remove_ctrl(struct hsi_controller *ssi) | |
170 | { | |
171 | struct omap_ssi_controller *omap_ssi = hsi_controller_drvdata(ssi); | |
172 | ||
173 | debugfs_remove_recursive(omap_ssi->dir); | |
174 | } | |
175 | #endif /* CONFIG_DEBUG_FS */ | |
176 | ||
177 | /* | |
178 | * FIXME: Horrible HACK needed until we remove the useless wakeline test | |
179 | * in the CMT. To be removed !!!! | |
180 | */ | |
181 | void ssi_waketest(struct hsi_client *cl, unsigned int enable) | |
182 | { | |
183 | struct hsi_port *port = hsi_get_port(cl); | |
184 | struct omap_ssi_port *omap_port = hsi_port_drvdata(port); | |
185 | struct hsi_controller *ssi = to_hsi_controller(port->device.parent); | |
186 | struct omap_ssi_controller *omap_ssi = hsi_controller_drvdata(ssi); | |
187 | ||
188 | omap_port->wktest = !!enable; | |
189 | if (omap_port->wktest) { | |
190 | pm_runtime_get_sync(ssi->device.parent); | |
191 | writel_relaxed(SSI_WAKE(0), | |
192 | omap_ssi->sys + SSI_SET_WAKE_REG(port->num)); | |
193 | } else { | |
194 | writel_relaxed(SSI_WAKE(0), | |
195 | omap_ssi->sys + SSI_CLEAR_WAKE_REG(port->num)); | |
196 | pm_runtime_put_sync(ssi->device.parent); | |
197 | } | |
198 | } | |
199 | EXPORT_SYMBOL_GPL(ssi_waketest); | |
200 | ||
201 | static void ssi_gdd_complete(struct hsi_controller *ssi, unsigned int lch) | |
202 | { | |
203 | struct omap_ssi_controller *omap_ssi = hsi_controller_drvdata(ssi); | |
204 | struct hsi_msg *msg = omap_ssi->gdd_trn[lch].msg; | |
205 | struct hsi_port *port = to_hsi_port(msg->cl->device.parent); | |
206 | struct omap_ssi_port *omap_port = hsi_port_drvdata(port); | |
207 | unsigned int dir; | |
208 | u32 csr; | |
209 | u32 val; | |
210 | ||
211 | spin_lock(&omap_ssi->lock); | |
212 | ||
213 | val = readl(omap_ssi->sys + SSI_GDD_MPU_IRQ_ENABLE_REG); | |
214 | val &= ~SSI_GDD_LCH(lch); | |
215 | writel_relaxed(val, omap_ssi->sys + SSI_GDD_MPU_IRQ_ENABLE_REG); | |
216 | ||
217 | if (msg->ttype == HSI_MSG_READ) { | |
218 | dir = DMA_FROM_DEVICE; | |
219 | val = SSI_DATAAVAILABLE(msg->channel); | |
220 | pm_runtime_put_sync(ssi->device.parent); | |
221 | } else { | |
222 | dir = DMA_TO_DEVICE; | |
223 | val = SSI_DATAACCEPT(msg->channel); | |
224 | /* Keep clocks reference for write pio event */ | |
225 | } | |
226 | dma_unmap_sg(&ssi->device, msg->sgt.sgl, msg->sgt.nents, dir); | |
227 | csr = readw(omap_ssi->gdd + SSI_GDD_CSR_REG(lch)); | |
228 | omap_ssi->gdd_trn[lch].msg = NULL; /* release GDD lch */ | |
229 | dev_dbg(&port->device, "DMA completed ch %d ttype %d\n", | |
230 | msg->channel, msg->ttype); | |
231 | spin_unlock(&omap_ssi->lock); | |
232 | if (csr & SSI_CSR_TOUR) { /* Timeout error */ | |
233 | msg->status = HSI_STATUS_ERROR; | |
234 | msg->actual_len = 0; | |
235 | spin_lock(&omap_port->lock); | |
236 | list_del(&msg->link); /* Dequeue msg */ | |
237 | spin_unlock(&omap_port->lock); | |
238 | msg->complete(msg); | |
239 | return; | |
240 | } | |
241 | spin_lock(&omap_port->lock); | |
242 | val |= readl(omap_ssi->sys + SSI_MPU_ENABLE_REG(port->num, 0)); | |
243 | writel_relaxed(val, omap_ssi->sys + SSI_MPU_ENABLE_REG(port->num, 0)); | |
244 | spin_unlock(&omap_port->lock); | |
245 | ||
246 | msg->status = HSI_STATUS_COMPLETED; | |
247 | msg->actual_len = sg_dma_len(msg->sgt.sgl); | |
248 | } | |
249 | ||
250 | static void ssi_gdd_tasklet(unsigned long dev) | |
251 | { | |
252 | struct hsi_controller *ssi = (struct hsi_controller *)dev; | |
253 | struct omap_ssi_controller *omap_ssi = hsi_controller_drvdata(ssi); | |
254 | void __iomem *sys = omap_ssi->sys; | |
255 | unsigned int lch; | |
256 | u32 status_reg; | |
257 | ||
258 | pm_runtime_get_sync(ssi->device.parent); | |
259 | ||
260 | status_reg = readl(sys + SSI_GDD_MPU_IRQ_STATUS_REG); | |
261 | for (lch = 0; lch < SSI_MAX_GDD_LCH; lch++) { | |
262 | if (status_reg & SSI_GDD_LCH(lch)) | |
263 | ssi_gdd_complete(ssi, lch); | |
264 | } | |
265 | writel_relaxed(status_reg, sys + SSI_GDD_MPU_IRQ_STATUS_REG); | |
266 | status_reg = readl(sys + SSI_GDD_MPU_IRQ_STATUS_REG); | |
267 | ||
268 | pm_runtime_put_sync(ssi->device.parent); | |
269 | ||
270 | if (status_reg) | |
271 | tasklet_hi_schedule(&omap_ssi->gdd_tasklet); | |
272 | else | |
273 | enable_irq(omap_ssi->gdd_irq); | |
274 | ||
275 | } | |
276 | ||
277 | static irqreturn_t ssi_gdd_isr(int irq, void *ssi) | |
278 | { | |
279 | struct omap_ssi_controller *omap_ssi = hsi_controller_drvdata(ssi); | |
280 | ||
281 | tasklet_hi_schedule(&omap_ssi->gdd_tasklet); | |
282 | disable_irq_nosync(irq); | |
283 | ||
284 | return IRQ_HANDLED; | |
285 | } | |
286 | ||
287 | static unsigned long ssi_get_clk_rate(struct hsi_controller *ssi) | |
288 | { | |
289 | struct omap_ssi_controller *omap_ssi = hsi_controller_drvdata(ssi); | |
290 | unsigned long rate = clk_get_rate(omap_ssi->fck); | |
291 | return rate; | |
292 | } | |
293 | ||
294 | static int __init ssi_get_iomem(struct platform_device *pd, | |
295 | const char *name, void __iomem **pbase, dma_addr_t *phy) | |
296 | { | |
297 | struct resource *mem; | |
298 | struct resource *ioarea; | |
299 | void __iomem *base; | |
300 | struct hsi_controller *ssi = platform_get_drvdata(pd); | |
301 | ||
302 | mem = platform_get_resource_byname(pd, IORESOURCE_MEM, name); | |
303 | if (!mem) { | |
304 | dev_err(&pd->dev, "IO memory region missing (%s)\n", name); | |
305 | return -ENXIO; | |
306 | } | |
307 | ioarea = devm_request_mem_region(&ssi->device, mem->start, | |
308 | resource_size(mem), dev_name(&pd->dev)); | |
309 | if (!ioarea) { | |
310 | dev_err(&pd->dev, "%s IO memory region request failed\n", | |
311 | mem->name); | |
312 | return -ENXIO; | |
313 | } | |
314 | base = devm_ioremap(&ssi->device, mem->start, resource_size(mem)); | |
315 | if (!base) { | |
316 | dev_err(&pd->dev, "%s IO remap failed\n", mem->name); | |
317 | return -ENXIO; | |
318 | } | |
319 | *pbase = base; | |
320 | ||
321 | if (phy) | |
322 | *phy = mem->start; | |
323 | ||
324 | return 0; | |
325 | } | |
326 | ||
327 | static int __init ssi_add_controller(struct hsi_controller *ssi, | |
328 | struct platform_device *pd) | |
329 | { | |
330 | struct omap_ssi_controller *omap_ssi; | |
331 | int err; | |
332 | ||
333 | omap_ssi = devm_kzalloc(&ssi->device, sizeof(*omap_ssi), GFP_KERNEL); | |
334 | if (!omap_ssi) { | |
335 | dev_err(&pd->dev, "not enough memory for omap ssi\n"); | |
336 | return -ENOMEM; | |
337 | } | |
338 | ||
339 | ssi->id = ida_simple_get(&platform_omap_ssi_ida, 0, 0, GFP_KERNEL); | |
340 | if (ssi->id < 0) { | |
341 | err = ssi->id; | |
342 | goto out_err; | |
343 | } | |
344 | ||
345 | ssi->owner = THIS_MODULE; | |
346 | ssi->device.parent = &pd->dev; | |
347 | dev_set_name(&ssi->device, "ssi%d", ssi->id); | |
348 | hsi_controller_set_drvdata(ssi, omap_ssi); | |
349 | omap_ssi->dev = &ssi->device; | |
350 | err = ssi_get_iomem(pd, "sys", &omap_ssi->sys, NULL); | |
351 | if (err < 0) | |
352 | goto out_err; | |
353 | err = ssi_get_iomem(pd, "gdd", &omap_ssi->gdd, NULL); | |
354 | if (err < 0) | |
355 | goto out_err; | |
b74d4954 AU |
356 | err = platform_get_irq_byname(pd, "gdd_mpu"); |
357 | if (err < 0) { | |
b209e047 | 358 | dev_err(&pd->dev, "GDD IRQ resource missing\n"); |
b209e047 SR |
359 | goto out_err; |
360 | } | |
b74d4954 | 361 | omap_ssi->gdd_irq = err; |
b209e047 SR |
362 | tasklet_init(&omap_ssi->gdd_tasklet, ssi_gdd_tasklet, |
363 | (unsigned long)ssi); | |
364 | err = devm_request_irq(&ssi->device, omap_ssi->gdd_irq, ssi_gdd_isr, | |
365 | 0, "gdd_mpu", ssi); | |
366 | if (err < 0) { | |
367 | dev_err(&ssi->device, "Request GDD IRQ %d failed (%d)", | |
368 | omap_ssi->gdd_irq, err); | |
369 | goto out_err; | |
370 | } | |
371 | ||
372 | omap_ssi->port = devm_kzalloc(&ssi->device, | |
373 | sizeof(struct omap_ssi_port *) * ssi->num_ports, GFP_KERNEL); | |
374 | if (!omap_ssi->port) { | |
375 | err = -ENOMEM; | |
376 | goto out_err; | |
377 | } | |
378 | ||
379 | omap_ssi->fck = devm_clk_get(&ssi->device, "ssi_ssr_fck"); | |
380 | if (IS_ERR(omap_ssi->fck)) { | |
381 | dev_err(&pd->dev, "Could not acquire clock \"ssi_ssr_fck\": %li\n", | |
382 | PTR_ERR(omap_ssi->fck)); | |
383 | err = -ENODEV; | |
384 | goto out_err; | |
385 | } | |
386 | ||
387 | /* TODO: find register, which can be used to detect context loss */ | |
388 | omap_ssi->get_loss = NULL; | |
389 | ||
390 | omap_ssi->max_speed = UINT_MAX; | |
391 | spin_lock_init(&omap_ssi->lock); | |
392 | err = hsi_register_controller(ssi); | |
393 | ||
394 | if (err < 0) | |
395 | goto out_err; | |
396 | ||
397 | return 0; | |
398 | ||
399 | out_err: | |
400 | ida_simple_remove(&platform_omap_ssi_ida, ssi->id); | |
401 | return err; | |
402 | } | |
403 | ||
404 | static int __init ssi_hw_init(struct hsi_controller *ssi) | |
405 | { | |
406 | struct omap_ssi_controller *omap_ssi = hsi_controller_drvdata(ssi); | |
407 | unsigned int i; | |
408 | u32 val; | |
409 | int err; | |
410 | ||
411 | err = pm_runtime_get_sync(ssi->device.parent); | |
412 | if (err < 0) { | |
413 | dev_err(&ssi->device, "runtime PM failed %d\n", err); | |
414 | return err; | |
415 | } | |
416 | /* Reseting SSI controller */ | |
417 | writel_relaxed(SSI_SOFTRESET, omap_ssi->sys + SSI_SYSCONFIG_REG); | |
418 | val = readl(omap_ssi->sys + SSI_SYSSTATUS_REG); | |
419 | for (i = 0; ((i < 20) && !(val & SSI_RESETDONE)); i++) { | |
420 | msleep(20); | |
421 | val = readl(omap_ssi->sys + SSI_SYSSTATUS_REG); | |
422 | } | |
423 | if (!(val & SSI_RESETDONE)) { | |
424 | dev_err(&ssi->device, "SSI HW reset failed\n"); | |
425 | pm_runtime_put_sync(ssi->device.parent); | |
426 | return -EIO; | |
427 | } | |
428 | /* Reseting GDD */ | |
429 | writel_relaxed(SSI_SWRESET, omap_ssi->gdd + SSI_GDD_GRST_REG); | |
430 | /* Get FCK rate in KHz */ | |
431 | omap_ssi->fck_rate = DIV_ROUND_CLOSEST(ssi_get_clk_rate(ssi), 1000); | |
432 | dev_dbg(&ssi->device, "SSI fck rate %lu KHz\n", omap_ssi->fck_rate); | |
433 | /* Set default PM settings */ | |
434 | val = SSI_AUTOIDLE | SSI_SIDLEMODE_SMART | SSI_MIDLEMODE_SMART; | |
435 | writel_relaxed(val, omap_ssi->sys + SSI_SYSCONFIG_REG); | |
436 | omap_ssi->sysconfig = val; | |
437 | writel_relaxed(SSI_CLK_AUTOGATING_ON, omap_ssi->sys + SSI_GDD_GCR_REG); | |
438 | omap_ssi->gdd_gcr = SSI_CLK_AUTOGATING_ON; | |
439 | pm_runtime_put_sync(ssi->device.parent); | |
440 | ||
441 | return 0; | |
442 | } | |
443 | ||
444 | static void ssi_remove_controller(struct hsi_controller *ssi) | |
445 | { | |
446 | struct omap_ssi_controller *omap_ssi = hsi_controller_drvdata(ssi); | |
447 | int id = ssi->id; | |
448 | tasklet_kill(&omap_ssi->gdd_tasklet); | |
449 | hsi_unregister_controller(ssi); | |
450 | ida_simple_remove(&platform_omap_ssi_ida, id); | |
451 | } | |
452 | ||
453 | static inline int ssi_of_get_available_ports_count(const struct device_node *np) | |
454 | { | |
455 | struct device_node *child; | |
456 | int num = 0; | |
457 | ||
458 | for_each_available_child_of_node(np, child) | |
459 | if (of_device_is_compatible(child, "ti,omap3-ssi-port")) | |
460 | num++; | |
461 | ||
462 | return num; | |
463 | } | |
464 | ||
465 | static int ssi_remove_ports(struct device *dev, void *c) | |
466 | { | |
467 | struct platform_device *pdev = to_platform_device(dev); | |
468 | ||
469 | of_device_unregister(pdev); | |
470 | ||
471 | return 0; | |
472 | } | |
473 | ||
474 | static int __init ssi_probe(struct platform_device *pd) | |
475 | { | |
476 | struct platform_device *childpdev; | |
477 | struct device_node *np = pd->dev.of_node; | |
478 | struct device_node *child; | |
479 | struct hsi_controller *ssi; | |
480 | int err; | |
481 | int num_ports; | |
482 | ||
483 | if (!np) { | |
484 | dev_err(&pd->dev, "missing device tree data\n"); | |
485 | return -EINVAL; | |
486 | } | |
487 | ||
488 | num_ports = ssi_of_get_available_ports_count(np); | |
489 | ||
490 | ssi = hsi_alloc_controller(num_ports, GFP_KERNEL); | |
491 | if (!ssi) { | |
492 | dev_err(&pd->dev, "No memory for controller\n"); | |
493 | return -ENOMEM; | |
494 | } | |
495 | ||
496 | platform_set_drvdata(pd, ssi); | |
497 | ||
498 | err = ssi_add_controller(ssi, pd); | |
499 | if (err < 0) | |
500 | goto out1; | |
501 | ||
502 | pm_runtime_irq_safe(&pd->dev); | |
503 | pm_runtime_enable(&pd->dev); | |
504 | ||
505 | err = ssi_hw_init(ssi); | |
506 | if (err < 0) | |
507 | goto out2; | |
508 | #ifdef CONFIG_DEBUG_FS | |
509 | err = ssi_debug_add_ctrl(ssi); | |
510 | if (err < 0) | |
511 | goto out2; | |
512 | #endif | |
513 | ||
514 | for_each_available_child_of_node(np, child) { | |
515 | if (!of_device_is_compatible(child, "ti,omap3-ssi-port")) | |
516 | continue; | |
517 | ||
518 | childpdev = of_platform_device_create(child, NULL, &pd->dev); | |
519 | if (!childpdev) { | |
520 | err = -ENODEV; | |
521 | dev_err(&pd->dev, "failed to create ssi controller port\n"); | |
522 | goto out3; | |
523 | } | |
524 | } | |
525 | ||
526 | dev_info(&pd->dev, "ssi controller %d initialized (%d ports)!\n", | |
527 | ssi->id, num_ports); | |
528 | return err; | |
529 | out3: | |
530 | device_for_each_child(&pd->dev, NULL, ssi_remove_ports); | |
531 | out2: | |
532 | ssi_remove_controller(ssi); | |
533 | out1: | |
534 | platform_set_drvdata(pd, NULL); | |
535 | pm_runtime_disable(&pd->dev); | |
536 | ||
537 | return err; | |
538 | } | |
539 | ||
540 | static int __exit ssi_remove(struct platform_device *pd) | |
541 | { | |
542 | struct hsi_controller *ssi = platform_get_drvdata(pd); | |
543 | ||
544 | #ifdef CONFIG_DEBUG_FS | |
545 | ssi_debug_remove_ctrl(ssi); | |
546 | #endif | |
547 | ssi_remove_controller(ssi); | |
548 | platform_set_drvdata(pd, NULL); | |
549 | ||
550 | pm_runtime_disable(&pd->dev); | |
551 | ||
552 | /* cleanup of of_platform_populate() call */ | |
553 | device_for_each_child(&pd->dev, NULL, ssi_remove_ports); | |
554 | ||
555 | return 0; | |
556 | } | |
557 | ||
558 | #ifdef CONFIG_PM_RUNTIME | |
559 | static int omap_ssi_runtime_suspend(struct device *dev) | |
560 | { | |
561 | struct hsi_controller *ssi = dev_get_drvdata(dev); | |
562 | struct omap_ssi_controller *omap_ssi = hsi_controller_drvdata(ssi); | |
563 | ||
564 | dev_dbg(dev, "runtime suspend!\n"); | |
565 | ||
566 | if (omap_ssi->get_loss) | |
567 | omap_ssi->loss_count = | |
568 | omap_ssi->get_loss(ssi->device.parent); | |
569 | ||
570 | return 0; | |
571 | } | |
572 | ||
573 | static int omap_ssi_runtime_resume(struct device *dev) | |
574 | { | |
575 | struct hsi_controller *ssi = dev_get_drvdata(dev); | |
576 | struct omap_ssi_controller *omap_ssi = hsi_controller_drvdata(ssi); | |
577 | ||
578 | dev_dbg(dev, "runtime resume!\n"); | |
579 | ||
580 | if ((omap_ssi->get_loss) && (omap_ssi->loss_count == | |
581 | omap_ssi->get_loss(ssi->device.parent))) | |
582 | return 0; | |
583 | ||
584 | writel_relaxed(omap_ssi->gdd_gcr, omap_ssi->gdd + SSI_GDD_GCR_REG); | |
585 | ||
586 | return 0; | |
587 | } | |
588 | ||
589 | static const struct dev_pm_ops omap_ssi_pm_ops = { | |
590 | SET_RUNTIME_PM_OPS(omap_ssi_runtime_suspend, omap_ssi_runtime_resume, | |
591 | NULL) | |
592 | }; | |
593 | ||
594 | #define DEV_PM_OPS (&omap_ssi_pm_ops) | |
595 | #else | |
596 | #define DEV_PM_OPS NULL | |
597 | #endif | |
598 | ||
599 | #ifdef CONFIG_OF | |
600 | static const struct of_device_id omap_ssi_of_match[] = { | |
601 | { .compatible = "ti,omap3-ssi", }, | |
602 | {}, | |
603 | }; | |
604 | MODULE_DEVICE_TABLE(of, omap_ssi_of_match); | |
605 | #else | |
606 | #define omap_ssi_of_match NULL | |
607 | #endif | |
608 | ||
609 | static struct platform_driver ssi_pdriver = { | |
610 | .remove = __exit_p(ssi_remove), | |
611 | .driver = { | |
612 | .name = "omap_ssi", | |
613 | .owner = THIS_MODULE, | |
614 | .pm = DEV_PM_OPS, | |
615 | .of_match_table = omap_ssi_of_match, | |
616 | }, | |
617 | }; | |
618 | ||
619 | module_platform_driver_probe(ssi_pdriver, ssi_probe); | |
620 | ||
621 | MODULE_ALIAS("platform:omap_ssi"); | |
622 | MODULE_AUTHOR("Carlos Chinea <carlos.chinea@nokia.com>"); | |
623 | MODULE_AUTHOR("Sebastian Reichel <sre@kernel.org>"); | |
624 | MODULE_DESCRIPTION("Synchronous Serial Interface Driver"); | |
625 | MODULE_LICENSE("GPL v2"); |