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2b27bdcc | 1 | // SPDX-License-Identifier: GPL-2.0-only |
b209e047 SR |
2 | /* OMAP SSI driver. |
3 | * | |
4 | * Copyright (C) 2010 Nokia Corporation. All rights reserved. | |
5 | * Copyright (C) 2014 Sebastian Reichel <sre@kernel.org> | |
6 | * | |
7 | * Contact: Carlos Chinea <carlos.chinea@nokia.com> | |
b209e047 SR |
8 | */ |
9 | ||
10 | #include <linux/compiler.h> | |
11 | #include <linux/err.h> | |
12 | #include <linux/ioport.h> | |
13 | #include <linux/io.h> | |
b209e047 SR |
14 | #include <linux/clk.h> |
15 | #include <linux/device.h> | |
16 | #include <linux/platform_device.h> | |
17 | #include <linux/dma-mapping.h> | |
18 | #include <linux/dmaengine.h> | |
19 | #include <linux/delay.h> | |
20 | #include <linux/seq_file.h> | |
21 | #include <linux/scatterlist.h> | |
22 | #include <linux/interrupt.h> | |
23 | #include <linux/spinlock.h> | |
24 | #include <linux/debugfs.h> | |
ac8e3ff3 | 25 | #include <linux/pinctrl/consumer.h> |
b209e047 SR |
26 | #include <linux/pm_runtime.h> |
27 | #include <linux/of_platform.h> | |
28 | #include <linux/hsi/hsi.h> | |
29 | #include <linux/idr.h> | |
30 | ||
31 | #include "omap_ssi_regs.h" | |
32 | #include "omap_ssi.h" | |
33 | ||
34 | /* For automatically allocated device IDs */ | |
35 | static DEFINE_IDA(platform_omap_ssi_ida); | |
36 | ||
37 | #ifdef CONFIG_DEBUG_FS | |
3a658e09 | 38 | static int ssi_regs_show(struct seq_file *m, void *p __maybe_unused) |
b209e047 SR |
39 | { |
40 | struct hsi_controller *ssi = m->private; | |
41 | struct omap_ssi_controller *omap_ssi = hsi_controller_drvdata(ssi); | |
42 | void __iomem *sys = omap_ssi->sys; | |
43 | ||
44 | pm_runtime_get_sync(ssi->device.parent); | |
45 | seq_printf(m, "REVISION\t: 0x%08x\n", readl(sys + SSI_REVISION_REG)); | |
46 | seq_printf(m, "SYSCONFIG\t: 0x%08x\n", readl(sys + SSI_SYSCONFIG_REG)); | |
47 | seq_printf(m, "SYSSTATUS\t: 0x%08x\n", readl(sys + SSI_SYSSTATUS_REG)); | |
ea88f717 | 48 | pm_runtime_put(ssi->device.parent); |
b209e047 SR |
49 | |
50 | return 0; | |
51 | } | |
52 | ||
3a658e09 | 53 | static int ssi_gdd_regs_show(struct seq_file *m, void *p __maybe_unused) |
b209e047 SR |
54 | { |
55 | struct hsi_controller *ssi = m->private; | |
56 | struct omap_ssi_controller *omap_ssi = hsi_controller_drvdata(ssi); | |
57 | void __iomem *gdd = omap_ssi->gdd; | |
58 | void __iomem *sys = omap_ssi->sys; | |
59 | int lch; | |
60 | ||
61 | pm_runtime_get_sync(ssi->device.parent); | |
62 | ||
63 | seq_printf(m, "GDD_MPU_STATUS\t: 0x%08x\n", | |
64 | readl(sys + SSI_GDD_MPU_IRQ_STATUS_REG)); | |
65 | seq_printf(m, "GDD_MPU_ENABLE\t: 0x%08x\n\n", | |
66 | readl(sys + SSI_GDD_MPU_IRQ_ENABLE_REG)); | |
67 | seq_printf(m, "HW_ID\t\t: 0x%08x\n", | |
68 | readl(gdd + SSI_GDD_HW_ID_REG)); | |
69 | seq_printf(m, "PPORT_ID\t: 0x%08x\n", | |
70 | readl(gdd + SSI_GDD_PPORT_ID_REG)); | |
71 | seq_printf(m, "MPORT_ID\t: 0x%08x\n", | |
72 | readl(gdd + SSI_GDD_MPORT_ID_REG)); | |
73 | seq_printf(m, "TEST\t\t: 0x%08x\n", | |
74 | readl(gdd + SSI_GDD_TEST_REG)); | |
75 | seq_printf(m, "GCR\t\t: 0x%08x\n", | |
76 | readl(gdd + SSI_GDD_GCR_REG)); | |
77 | ||
78 | for (lch = 0; lch < SSI_MAX_GDD_LCH; lch++) { | |
79 | seq_printf(m, "\nGDD LCH %d\n=========\n", lch); | |
80 | seq_printf(m, "CSDP\t\t: 0x%04x\n", | |
81 | readw(gdd + SSI_GDD_CSDP_REG(lch))); | |
82 | seq_printf(m, "CCR\t\t: 0x%04x\n", | |
83 | readw(gdd + SSI_GDD_CCR_REG(lch))); | |
84 | seq_printf(m, "CICR\t\t: 0x%04x\n", | |
85 | readw(gdd + SSI_GDD_CICR_REG(lch))); | |
86 | seq_printf(m, "CSR\t\t: 0x%04x\n", | |
87 | readw(gdd + SSI_GDD_CSR_REG(lch))); | |
88 | seq_printf(m, "CSSA\t\t: 0x%08x\n", | |
89 | readl(gdd + SSI_GDD_CSSA_REG(lch))); | |
90 | seq_printf(m, "CDSA\t\t: 0x%08x\n", | |
91 | readl(gdd + SSI_GDD_CDSA_REG(lch))); | |
92 | seq_printf(m, "CEN\t\t: 0x%04x\n", | |
93 | readw(gdd + SSI_GDD_CEN_REG(lch))); | |
94 | seq_printf(m, "CSAC\t\t: 0x%04x\n", | |
95 | readw(gdd + SSI_GDD_CSAC_REG(lch))); | |
96 | seq_printf(m, "CDAC\t\t: 0x%04x\n", | |
97 | readw(gdd + SSI_GDD_CDAC_REG(lch))); | |
98 | seq_printf(m, "CLNK_CTRL\t: 0x%04x\n", | |
99 | readw(gdd + SSI_GDD_CLNK_CTRL_REG(lch))); | |
100 | } | |
101 | ||
ea88f717 | 102 | pm_runtime_put(ssi->device.parent); |
b209e047 SR |
103 | |
104 | return 0; | |
105 | } | |
106 | ||
3a658e09 YL |
107 | DEFINE_SHOW_ATTRIBUTE(ssi_regs); |
108 | DEFINE_SHOW_ATTRIBUTE(ssi_gdd_regs); | |
b209e047 | 109 | |
0845e1f2 | 110 | static int ssi_debug_add_ctrl(struct hsi_controller *ssi) |
b209e047 SR |
111 | { |
112 | struct omap_ssi_controller *omap_ssi = hsi_controller_drvdata(ssi); | |
113 | struct dentry *dir; | |
114 | ||
115 | /* SSI controller */ | |
116 | omap_ssi->dir = debugfs_create_dir(dev_name(&ssi->device), NULL); | |
3fd276e9 WY |
117 | if (!omap_ssi->dir) |
118 | return -ENOMEM; | |
b209e047 SR |
119 | |
120 | debugfs_create_file("regs", S_IRUGO, omap_ssi->dir, ssi, | |
121 | &ssi_regs_fops); | |
122 | /* SSI GDD (DMA) */ | |
123 | dir = debugfs_create_dir("gdd", omap_ssi->dir); | |
3fd276e9 | 124 | if (!dir) |
b209e047 SR |
125 | goto rback; |
126 | debugfs_create_file("regs", S_IRUGO, dir, ssi, &ssi_gdd_regs_fops); | |
127 | ||
128 | return 0; | |
129 | rback: | |
130 | debugfs_remove_recursive(omap_ssi->dir); | |
131 | ||
3fd276e9 | 132 | return -ENOMEM; |
b209e047 SR |
133 | } |
134 | ||
135 | static void ssi_debug_remove_ctrl(struct hsi_controller *ssi) | |
136 | { | |
137 | struct omap_ssi_controller *omap_ssi = hsi_controller_drvdata(ssi); | |
138 | ||
139 | debugfs_remove_recursive(omap_ssi->dir); | |
140 | } | |
141 | #endif /* CONFIG_DEBUG_FS */ | |
142 | ||
143 | /* | |
144 | * FIXME: Horrible HACK needed until we remove the useless wakeline test | |
145 | * in the CMT. To be removed !!!! | |
146 | */ | |
147 | void ssi_waketest(struct hsi_client *cl, unsigned int enable) | |
148 | { | |
149 | struct hsi_port *port = hsi_get_port(cl); | |
150 | struct omap_ssi_port *omap_port = hsi_port_drvdata(port); | |
151 | struct hsi_controller *ssi = to_hsi_controller(port->device.parent); | |
152 | struct omap_ssi_controller *omap_ssi = hsi_controller_drvdata(ssi); | |
153 | ||
154 | omap_port->wktest = !!enable; | |
155 | if (omap_port->wktest) { | |
156 | pm_runtime_get_sync(ssi->device.parent); | |
157 | writel_relaxed(SSI_WAKE(0), | |
158 | omap_ssi->sys + SSI_SET_WAKE_REG(port->num)); | |
159 | } else { | |
160 | writel_relaxed(SSI_WAKE(0), | |
161 | omap_ssi->sys + SSI_CLEAR_WAKE_REG(port->num)); | |
ea88f717 | 162 | pm_runtime_put(ssi->device.parent); |
b209e047 SR |
163 | } |
164 | } | |
165 | EXPORT_SYMBOL_GPL(ssi_waketest); | |
166 | ||
167 | static void ssi_gdd_complete(struct hsi_controller *ssi, unsigned int lch) | |
168 | { | |
169 | struct omap_ssi_controller *omap_ssi = hsi_controller_drvdata(ssi); | |
170 | struct hsi_msg *msg = omap_ssi->gdd_trn[lch].msg; | |
171 | struct hsi_port *port = to_hsi_port(msg->cl->device.parent); | |
172 | struct omap_ssi_port *omap_port = hsi_port_drvdata(port); | |
173 | unsigned int dir; | |
174 | u32 csr; | |
175 | u32 val; | |
176 | ||
177 | spin_lock(&omap_ssi->lock); | |
178 | ||
179 | val = readl(omap_ssi->sys + SSI_GDD_MPU_IRQ_ENABLE_REG); | |
180 | val &= ~SSI_GDD_LCH(lch); | |
181 | writel_relaxed(val, omap_ssi->sys + SSI_GDD_MPU_IRQ_ENABLE_REG); | |
182 | ||
183 | if (msg->ttype == HSI_MSG_READ) { | |
184 | dir = DMA_FROM_DEVICE; | |
185 | val = SSI_DATAAVAILABLE(msg->channel); | |
ea88f717 | 186 | pm_runtime_put(omap_port->pdev); |
b209e047 SR |
187 | } else { |
188 | dir = DMA_TO_DEVICE; | |
189 | val = SSI_DATAACCEPT(msg->channel); | |
190 | /* Keep clocks reference for write pio event */ | |
191 | } | |
192 | dma_unmap_sg(&ssi->device, msg->sgt.sgl, msg->sgt.nents, dir); | |
193 | csr = readw(omap_ssi->gdd + SSI_GDD_CSR_REG(lch)); | |
194 | omap_ssi->gdd_trn[lch].msg = NULL; /* release GDD lch */ | |
195 | dev_dbg(&port->device, "DMA completed ch %d ttype %d\n", | |
196 | msg->channel, msg->ttype); | |
197 | spin_unlock(&omap_ssi->lock); | |
198 | if (csr & SSI_CSR_TOUR) { /* Timeout error */ | |
199 | msg->status = HSI_STATUS_ERROR; | |
200 | msg->actual_len = 0; | |
201 | spin_lock(&omap_port->lock); | |
202 | list_del(&msg->link); /* Dequeue msg */ | |
203 | spin_unlock(&omap_port->lock); | |
4e552310 SR |
204 | |
205 | list_add_tail(&msg->link, &omap_port->errqueue); | |
206 | schedule_delayed_work(&omap_port->errqueue_work, 0); | |
b209e047 SR |
207 | return; |
208 | } | |
209 | spin_lock(&omap_port->lock); | |
210 | val |= readl(omap_ssi->sys + SSI_MPU_ENABLE_REG(port->num, 0)); | |
211 | writel_relaxed(val, omap_ssi->sys + SSI_MPU_ENABLE_REG(port->num, 0)); | |
212 | spin_unlock(&omap_port->lock); | |
213 | ||
214 | msg->status = HSI_STATUS_COMPLETED; | |
215 | msg->actual_len = sg_dma_len(msg->sgt.sgl); | |
216 | } | |
217 | ||
218 | static void ssi_gdd_tasklet(unsigned long dev) | |
219 | { | |
220 | struct hsi_controller *ssi = (struct hsi_controller *)dev; | |
221 | struct omap_ssi_controller *omap_ssi = hsi_controller_drvdata(ssi); | |
222 | void __iomem *sys = omap_ssi->sys; | |
223 | unsigned int lch; | |
224 | u32 status_reg; | |
225 | ||
927d3f8f SR |
226 | pm_runtime_get(ssi->device.parent); |
227 | ||
228 | if (!pm_runtime_active(ssi->device.parent)) { | |
229 | dev_warn(ssi->device.parent, "ssi_gdd_tasklet called without runtime PM!\n"); | |
230 | pm_runtime_put(ssi->device.parent); | |
231 | return; | |
232 | } | |
b209e047 SR |
233 | |
234 | status_reg = readl(sys + SSI_GDD_MPU_IRQ_STATUS_REG); | |
235 | for (lch = 0; lch < SSI_MAX_GDD_LCH; lch++) { | |
236 | if (status_reg & SSI_GDD_LCH(lch)) | |
237 | ssi_gdd_complete(ssi, lch); | |
238 | } | |
239 | writel_relaxed(status_reg, sys + SSI_GDD_MPU_IRQ_STATUS_REG); | |
240 | status_reg = readl(sys + SSI_GDD_MPU_IRQ_STATUS_REG); | |
241 | ||
ea88f717 | 242 | pm_runtime_put(ssi->device.parent); |
b209e047 SR |
243 | |
244 | if (status_reg) | |
245 | tasklet_hi_schedule(&omap_ssi->gdd_tasklet); | |
246 | else | |
247 | enable_irq(omap_ssi->gdd_irq); | |
248 | ||
249 | } | |
250 | ||
251 | static irqreturn_t ssi_gdd_isr(int irq, void *ssi) | |
252 | { | |
253 | struct omap_ssi_controller *omap_ssi = hsi_controller_drvdata(ssi); | |
254 | ||
255 | tasklet_hi_schedule(&omap_ssi->gdd_tasklet); | |
256 | disable_irq_nosync(irq); | |
257 | ||
258 | return IRQ_HANDLED; | |
259 | } | |
260 | ||
261 | static unsigned long ssi_get_clk_rate(struct hsi_controller *ssi) | |
262 | { | |
263 | struct omap_ssi_controller *omap_ssi = hsi_controller_drvdata(ssi); | |
264 | unsigned long rate = clk_get_rate(omap_ssi->fck); | |
265 | return rate; | |
266 | } | |
267 | ||
4bcf7414 SR |
268 | static int ssi_clk_event(struct notifier_block *nb, unsigned long event, |
269 | void *data) | |
270 | { | |
271 | struct omap_ssi_controller *omap_ssi = container_of(nb, | |
272 | struct omap_ssi_controller, fck_nb); | |
273 | struct hsi_controller *ssi = to_hsi_controller(omap_ssi->dev); | |
274 | struct clk_notifier_data *clk_data = data; | |
275 | struct omap_ssi_port *omap_port; | |
276 | int i; | |
277 | ||
278 | switch (event) { | |
279 | case PRE_RATE_CHANGE: | |
280 | dev_dbg(&ssi->device, "pre rate change\n"); | |
281 | ||
282 | for (i = 0; i < ssi->num_ports; i++) { | |
283 | omap_port = omap_ssi->port[i]; | |
284 | ||
285 | if (!omap_port) | |
286 | continue; | |
287 | ||
288 | /* Workaround for SWBREAK + CAwake down race in CMT */ | |
cb70e4c1 | 289 | disable_irq(omap_port->wake_irq); |
4bcf7414 SR |
290 | |
291 | /* stop all ssi communication */ | |
292 | pinctrl_pm_select_idle_state(omap_port->pdev); | |
293 | udelay(1); /* wait for racing frames */ | |
294 | } | |
295 | ||
296 | break; | |
297 | case ABORT_RATE_CHANGE: | |
298 | dev_dbg(&ssi->device, "abort rate change\n"); | |
df561f66 | 299 | fallthrough; |
4bcf7414 SR |
300 | case POST_RATE_CHANGE: |
301 | dev_dbg(&ssi->device, "post rate change (%lu -> %lu)\n", | |
302 | clk_data->old_rate, clk_data->new_rate); | |
3210b4fc | 303 | omap_ssi->fck_rate = DIV_ROUND_CLOSEST(clk_data->new_rate, 1000); /* kHz */ |
4bcf7414 SR |
304 | |
305 | for (i = 0; i < ssi->num_ports; i++) { | |
306 | omap_port = omap_ssi->port[i]; | |
307 | ||
308 | if (!omap_port) | |
309 | continue; | |
310 | ||
311 | omap_ssi_port_update_fclk(ssi, omap_port); | |
312 | ||
313 | /* resume ssi communication */ | |
314 | pinctrl_pm_select_default_state(omap_port->pdev); | |
cb70e4c1 | 315 | enable_irq(omap_port->wake_irq); |
4bcf7414 SR |
316 | } |
317 | ||
318 | break; | |
319 | default: | |
320 | break; | |
321 | } | |
322 | ||
323 | return NOTIFY_DONE; | |
324 | } | |
325 | ||
0845e1f2 | 326 | static int ssi_get_iomem(struct platform_device *pd, |
b209e047 SR |
327 | const char *name, void __iomem **pbase, dma_addr_t *phy) |
328 | { | |
329 | struct resource *mem; | |
b209e047 SR |
330 | void __iomem *base; |
331 | struct hsi_controller *ssi = platform_get_drvdata(pd); | |
332 | ||
333 | mem = platform_get_resource_byname(pd, IORESOURCE_MEM, name); | |
16bd5865 SS |
334 | base = devm_ioremap_resource(&ssi->device, mem); |
335 | if (IS_ERR(base)) | |
336 | return PTR_ERR(base); | |
337 | ||
b209e047 SR |
338 | *pbase = base; |
339 | ||
340 | if (phy) | |
341 | *phy = mem->start; | |
342 | ||
343 | return 0; | |
344 | } | |
345 | ||
0845e1f2 | 346 | static int ssi_add_controller(struct hsi_controller *ssi, |
b209e047 SR |
347 | struct platform_device *pd) |
348 | { | |
349 | struct omap_ssi_controller *omap_ssi; | |
350 | int err; | |
351 | ||
352 | omap_ssi = devm_kzalloc(&ssi->device, sizeof(*omap_ssi), GFP_KERNEL); | |
0fbad7c8 | 353 | if (!omap_ssi) |
b209e047 | 354 | return -ENOMEM; |
b209e047 | 355 | |
6bf6ded3 AH |
356 | err = ida_simple_get(&platform_omap_ssi_ida, 0, 0, GFP_KERNEL); |
357 | if (err < 0) | |
41fff6e1 | 358 | return err; |
6bf6ded3 | 359 | ssi->id = err; |
b209e047 SR |
360 | |
361 | ssi->owner = THIS_MODULE; | |
362 | ssi->device.parent = &pd->dev; | |
363 | dev_set_name(&ssi->device, "ssi%d", ssi->id); | |
364 | hsi_controller_set_drvdata(ssi, omap_ssi); | |
365 | omap_ssi->dev = &ssi->device; | |
366 | err = ssi_get_iomem(pd, "sys", &omap_ssi->sys, NULL); | |
367 | if (err < 0) | |
368 | goto out_err; | |
369 | err = ssi_get_iomem(pd, "gdd", &omap_ssi->gdd, NULL); | |
370 | if (err < 0) | |
371 | goto out_err; | |
b74d4954 | 372 | err = platform_get_irq_byname(pd, "gdd_mpu"); |
c1030cd4 | 373 | if (err < 0) |
b209e047 | 374 | goto out_err; |
b74d4954 | 375 | omap_ssi->gdd_irq = err; |
b209e047 SR |
376 | tasklet_init(&omap_ssi->gdd_tasklet, ssi_gdd_tasklet, |
377 | (unsigned long)ssi); | |
378 | err = devm_request_irq(&ssi->device, omap_ssi->gdd_irq, ssi_gdd_isr, | |
379 | 0, "gdd_mpu", ssi); | |
380 | if (err < 0) { | |
381 | dev_err(&ssi->device, "Request GDD IRQ %d failed (%d)", | |
382 | omap_ssi->gdd_irq, err); | |
383 | goto out_err; | |
384 | } | |
385 | ||
4a8557de ME |
386 | omap_ssi->port = devm_kcalloc(&ssi->device, ssi->num_ports, |
387 | sizeof(*omap_ssi->port), GFP_KERNEL); | |
b209e047 SR |
388 | if (!omap_ssi->port) { |
389 | err = -ENOMEM; | |
390 | goto out_err; | |
391 | } | |
392 | ||
393 | omap_ssi->fck = devm_clk_get(&ssi->device, "ssi_ssr_fck"); | |
394 | if (IS_ERR(omap_ssi->fck)) { | |
395 | dev_err(&pd->dev, "Could not acquire clock \"ssi_ssr_fck\": %li\n", | |
396 | PTR_ERR(omap_ssi->fck)); | |
397 | err = -ENODEV; | |
398 | goto out_err; | |
399 | } | |
400 | ||
4bcf7414 SR |
401 | omap_ssi->fck_nb.notifier_call = ssi_clk_event; |
402 | omap_ssi->fck_nb.priority = INT_MAX; | |
403 | clk_notifier_register(omap_ssi->fck, &omap_ssi->fck_nb); | |
404 | ||
b209e047 SR |
405 | /* TODO: find register, which can be used to detect context loss */ |
406 | omap_ssi->get_loss = NULL; | |
407 | ||
408 | omap_ssi->max_speed = UINT_MAX; | |
409 | spin_lock_init(&omap_ssi->lock); | |
410 | err = hsi_register_controller(ssi); | |
411 | ||
412 | if (err < 0) | |
413 | goto out_err; | |
414 | ||
415 | return 0; | |
416 | ||
417 | out_err: | |
418 | ida_simple_remove(&platform_omap_ssi_ida, ssi->id); | |
419 | return err; | |
420 | } | |
421 | ||
0845e1f2 | 422 | static int ssi_hw_init(struct hsi_controller *ssi) |
b209e047 SR |
423 | { |
424 | struct omap_ssi_controller *omap_ssi = hsi_controller_drvdata(ssi); | |
b209e047 SR |
425 | int err; |
426 | ||
427 | err = pm_runtime_get_sync(ssi->device.parent); | |
428 | if (err < 0) { | |
429 | dev_err(&ssi->device, "runtime PM failed %d\n", err); | |
430 | return err; | |
431 | } | |
8621e620 | 432 | /* Resetting GDD */ |
b209e047 | 433 | writel_relaxed(SSI_SWRESET, omap_ssi->gdd + SSI_GDD_GRST_REG); |
3210b4fc | 434 | /* Get FCK rate in kHz */ |
b209e047 | 435 | omap_ssi->fck_rate = DIV_ROUND_CLOSEST(ssi_get_clk_rate(ssi), 1000); |
3210b4fc | 436 | dev_dbg(&ssi->device, "SSI fck rate %lu kHz\n", omap_ssi->fck_rate); |
b6616be3 | 437 | |
b209e047 SR |
438 | writel_relaxed(SSI_CLK_AUTOGATING_ON, omap_ssi->sys + SSI_GDD_GCR_REG); |
439 | omap_ssi->gdd_gcr = SSI_CLK_AUTOGATING_ON; | |
440 | pm_runtime_put_sync(ssi->device.parent); | |
441 | ||
442 | return 0; | |
443 | } | |
444 | ||
445 | static void ssi_remove_controller(struct hsi_controller *ssi) | |
446 | { | |
447 | struct omap_ssi_controller *omap_ssi = hsi_controller_drvdata(ssi); | |
448 | int id = ssi->id; | |
449 | tasklet_kill(&omap_ssi->gdd_tasklet); | |
450 | hsi_unregister_controller(ssi); | |
4bcf7414 | 451 | clk_notifier_unregister(omap_ssi->fck, &omap_ssi->fck_nb); |
b209e047 SR |
452 | ida_simple_remove(&platform_omap_ssi_ida, id); |
453 | } | |
454 | ||
455 | static inline int ssi_of_get_available_ports_count(const struct device_node *np) | |
456 | { | |
457 | struct device_node *child; | |
458 | int num = 0; | |
459 | ||
460 | for_each_available_child_of_node(np, child) | |
461 | if (of_device_is_compatible(child, "ti,omap3-ssi-port")) | |
462 | num++; | |
463 | ||
464 | return num; | |
465 | } | |
466 | ||
467 | static int ssi_remove_ports(struct device *dev, void *c) | |
468 | { | |
469 | struct platform_device *pdev = to_platform_device(dev); | |
470 | ||
2a57aba8 SR |
471 | if (!dev->of_node) |
472 | return 0; | |
473 | ||
474 | of_node_clear_flag(dev->of_node, OF_POPULATED); | |
b209e047 SR |
475 | of_device_unregister(pdev); |
476 | ||
477 | return 0; | |
478 | } | |
479 | ||
0845e1f2 | 480 | static int ssi_probe(struct platform_device *pd) |
b209e047 SR |
481 | { |
482 | struct platform_device *childpdev; | |
483 | struct device_node *np = pd->dev.of_node; | |
484 | struct device_node *child; | |
485 | struct hsi_controller *ssi; | |
486 | int err; | |
487 | int num_ports; | |
488 | ||
489 | if (!np) { | |
490 | dev_err(&pd->dev, "missing device tree data\n"); | |
491 | return -EINVAL; | |
492 | } | |
493 | ||
494 | num_ports = ssi_of_get_available_ports_count(np); | |
495 | ||
496 | ssi = hsi_alloc_controller(num_ports, GFP_KERNEL); | |
497 | if (!ssi) { | |
498 | dev_err(&pd->dev, "No memory for controller\n"); | |
499 | return -ENOMEM; | |
500 | } | |
501 | ||
502 | platform_set_drvdata(pd, ssi); | |
503 | ||
504 | err = ssi_add_controller(ssi, pd); | |
505 | if (err < 0) | |
506 | goto out1; | |
507 | ||
b209e047 SR |
508 | pm_runtime_enable(&pd->dev); |
509 | ||
510 | err = ssi_hw_init(ssi); | |
511 | if (err < 0) | |
512 | goto out2; | |
513 | #ifdef CONFIG_DEBUG_FS | |
514 | err = ssi_debug_add_ctrl(ssi); | |
515 | if (err < 0) | |
516 | goto out2; | |
517 | #endif | |
518 | ||
519 | for_each_available_child_of_node(np, child) { | |
520 | if (!of_device_is_compatible(child, "ti,omap3-ssi-port")) | |
521 | continue; | |
522 | ||
523 | childpdev = of_platform_device_create(child, NULL, &pd->dev); | |
524 | if (!childpdev) { | |
525 | err = -ENODEV; | |
526 | dev_err(&pd->dev, "failed to create ssi controller port\n"); | |
527 | goto out3; | |
528 | } | |
529 | } | |
530 | ||
531 | dev_info(&pd->dev, "ssi controller %d initialized (%d ports)!\n", | |
532 | ssi->id, num_ports); | |
533 | return err; | |
534 | out3: | |
535 | device_for_each_child(&pd->dev, NULL, ssi_remove_ports); | |
536 | out2: | |
537 | ssi_remove_controller(ssi); | |
538 | out1: | |
539 | platform_set_drvdata(pd, NULL); | |
540 | pm_runtime_disable(&pd->dev); | |
541 | ||
542 | return err; | |
543 | } | |
544 | ||
0845e1f2 | 545 | static int ssi_remove(struct platform_device *pd) |
b209e047 SR |
546 | { |
547 | struct hsi_controller *ssi = platform_get_drvdata(pd); | |
548 | ||
f704e110 SR |
549 | /* cleanup of of_platform_populate() call */ |
550 | device_for_each_child(&pd->dev, NULL, ssi_remove_ports); | |
551 | ||
b209e047 SR |
552 | #ifdef CONFIG_DEBUG_FS |
553 | ssi_debug_remove_ctrl(ssi); | |
554 | #endif | |
555 | ssi_remove_controller(ssi); | |
556 | platform_set_drvdata(pd, NULL); | |
557 | ||
558 | pm_runtime_disable(&pd->dev); | |
559 | ||
b209e047 SR |
560 | return 0; |
561 | } | |
562 | ||
96a1c18a | 563 | #ifdef CONFIG_PM |
b209e047 SR |
564 | static int omap_ssi_runtime_suspend(struct device *dev) |
565 | { | |
566 | struct hsi_controller *ssi = dev_get_drvdata(dev); | |
567 | struct omap_ssi_controller *omap_ssi = hsi_controller_drvdata(ssi); | |
568 | ||
569 | dev_dbg(dev, "runtime suspend!\n"); | |
570 | ||
571 | if (omap_ssi->get_loss) | |
572 | omap_ssi->loss_count = | |
573 | omap_ssi->get_loss(ssi->device.parent); | |
574 | ||
575 | return 0; | |
576 | } | |
577 | ||
578 | static int omap_ssi_runtime_resume(struct device *dev) | |
579 | { | |
580 | struct hsi_controller *ssi = dev_get_drvdata(dev); | |
581 | struct omap_ssi_controller *omap_ssi = hsi_controller_drvdata(ssi); | |
582 | ||
583 | dev_dbg(dev, "runtime resume!\n"); | |
584 | ||
585 | if ((omap_ssi->get_loss) && (omap_ssi->loss_count == | |
586 | omap_ssi->get_loss(ssi->device.parent))) | |
587 | return 0; | |
588 | ||
589 | writel_relaxed(omap_ssi->gdd_gcr, omap_ssi->gdd + SSI_GDD_GCR_REG); | |
590 | ||
591 | return 0; | |
592 | } | |
593 | ||
594 | static const struct dev_pm_ops omap_ssi_pm_ops = { | |
595 | SET_RUNTIME_PM_OPS(omap_ssi_runtime_suspend, omap_ssi_runtime_resume, | |
596 | NULL) | |
597 | }; | |
598 | ||
599 | #define DEV_PM_OPS (&omap_ssi_pm_ops) | |
600 | #else | |
601 | #define DEV_PM_OPS NULL | |
602 | #endif | |
603 | ||
604 | #ifdef CONFIG_OF | |
605 | static const struct of_device_id omap_ssi_of_match[] = { | |
606 | { .compatible = "ti,omap3-ssi", }, | |
607 | {}, | |
608 | }; | |
609 | MODULE_DEVICE_TABLE(of, omap_ssi_of_match); | |
610 | #else | |
611 | #define omap_ssi_of_match NULL | |
612 | #endif | |
613 | ||
614 | static struct platform_driver ssi_pdriver = { | |
0845e1f2 SR |
615 | .probe = ssi_probe, |
616 | .remove = ssi_remove, | |
b209e047 SR |
617 | .driver = { |
618 | .name = "omap_ssi", | |
b209e047 SR |
619 | .pm = DEV_PM_OPS, |
620 | .of_match_table = omap_ssi_of_match, | |
621 | }, | |
622 | }; | |
623 | ||
0fae1989 SR |
624 | static int __init ssi_init(void) { |
625 | int ret; | |
626 | ||
627 | ret = platform_driver_register(&ssi_pdriver); | |
628 | if (ret) | |
629 | return ret; | |
630 | ||
631 | return platform_driver_register(&ssi_port_pdriver); | |
632 | } | |
633 | module_init(ssi_init); | |
634 | ||
635 | static void __exit ssi_exit(void) { | |
636 | platform_driver_unregister(&ssi_port_pdriver); | |
637 | platform_driver_unregister(&ssi_pdriver); | |
638 | } | |
639 | module_exit(ssi_exit); | |
b209e047 SR |
640 | |
641 | MODULE_ALIAS("platform:omap_ssi"); | |
642 | MODULE_AUTHOR("Carlos Chinea <carlos.chinea@nokia.com>"); | |
643 | MODULE_AUTHOR("Sebastian Reichel <sre@kernel.org>"); | |
644 | MODULE_DESCRIPTION("Synchronous Serial Interface Driver"); | |
645 | MODULE_LICENSE("GPL v2"); |