1 | // SPDX-License-Identifier: GPL-2.0-only |
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> |
8 | */ |
9 | |
10 | #include <linux/compiler.h> |
11 | #include <linux/err.h> |
12 | #include <linux/ioport.h> |
13 | #include <linux/io.h> |
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/hsi/ssi_protocol.h> |
21 | #include <linux/seq_file.h> |
22 | #include <linux/scatterlist.h> |
23 | #include <linux/interrupt.h> |
24 | #include <linux/spinlock.h> |
25 | #include <linux/debugfs.h> |
26 | #include <linux/pinctrl/consumer.h> |
27 | #include <linux/pm_runtime.h> |
28 | #include <linux/of.h> |
29 | #include <linux/of_platform.h> |
30 | #include <linux/hsi/hsi.h> |
31 | #include <linux/idr.h> |
32 | |
33 | #include "omap_ssi_regs.h" |
34 | #include "omap_ssi.h" |
35 | |
36 | /* For automatically allocated device IDs */ |
37 | static DEFINE_IDA(platform_omap_ssi_ida); |
38 | |
39 | #ifdef CONFIG_DEBUG_FS |
40 | static int ssi_regs_show(struct seq_file *m, void *p __maybe_unused) |
41 | { |
42 | struct hsi_controller *ssi = m->private; |
43 | struct omap_ssi_controller *omap_ssi = hsi_controller_drvdata(hsi: ssi); |
44 | void __iomem *sys = omap_ssi->sys; |
45 | |
46 | pm_runtime_get_sync(dev: ssi->device.parent); |
47 | seq_printf(m, fmt: "REVISION\t: 0x%08x\n" , readl(addr: sys + SSI_REVISION_REG)); |
48 | seq_printf(m, fmt: "SYSCONFIG\t: 0x%08x\n" , readl(addr: sys + SSI_SYSCONFIG_REG)); |
49 | seq_printf(m, fmt: "SYSSTATUS\t: 0x%08x\n" , readl(addr: sys + SSI_SYSSTATUS_REG)); |
50 | pm_runtime_put(dev: ssi->device.parent); |
51 | |
52 | return 0; |
53 | } |
54 | |
55 | static int ssi_gdd_regs_show(struct seq_file *m, void *p __maybe_unused) |
56 | { |
57 | struct hsi_controller *ssi = m->private; |
58 | struct omap_ssi_controller *omap_ssi = hsi_controller_drvdata(hsi: ssi); |
59 | void __iomem *gdd = omap_ssi->gdd; |
60 | void __iomem *sys = omap_ssi->sys; |
61 | int lch; |
62 | |
63 | pm_runtime_get_sync(dev: ssi->device.parent); |
64 | |
65 | seq_printf(m, fmt: "GDD_MPU_STATUS\t: 0x%08x\n" , |
66 | readl(addr: sys + SSI_GDD_MPU_IRQ_STATUS_REG)); |
67 | seq_printf(m, fmt: "GDD_MPU_ENABLE\t: 0x%08x\n\n" , |
68 | readl(addr: sys + SSI_GDD_MPU_IRQ_ENABLE_REG)); |
69 | seq_printf(m, fmt: "HW_ID\t\t: 0x%08x\n" , |
70 | readl(addr: gdd + SSI_GDD_HW_ID_REG)); |
71 | seq_printf(m, fmt: "PPORT_ID\t: 0x%08x\n" , |
72 | readl(addr: gdd + SSI_GDD_PPORT_ID_REG)); |
73 | seq_printf(m, fmt: "MPORT_ID\t: 0x%08x\n" , |
74 | readl(addr: gdd + SSI_GDD_MPORT_ID_REG)); |
75 | seq_printf(m, fmt: "TEST\t\t: 0x%08x\n" , |
76 | readl(addr: gdd + SSI_GDD_TEST_REG)); |
77 | seq_printf(m, fmt: "GCR\t\t: 0x%08x\n" , |
78 | readl(addr: gdd + SSI_GDD_GCR_REG)); |
79 | |
80 | for (lch = 0; lch < SSI_MAX_GDD_LCH; lch++) { |
81 | seq_printf(m, fmt: "\nGDD LCH %d\n=========\n" , lch); |
82 | seq_printf(m, fmt: "CSDP\t\t: 0x%04x\n" , |
83 | readw(addr: gdd + SSI_GDD_CSDP_REG(lch))); |
84 | seq_printf(m, fmt: "CCR\t\t: 0x%04x\n" , |
85 | readw(addr: gdd + SSI_GDD_CCR_REG(lch))); |
86 | seq_printf(m, fmt: "CICR\t\t: 0x%04x\n" , |
87 | readw(addr: gdd + SSI_GDD_CICR_REG(lch))); |
88 | seq_printf(m, fmt: "CSR\t\t: 0x%04x\n" , |
89 | readw(addr: gdd + SSI_GDD_CSR_REG(lch))); |
90 | seq_printf(m, fmt: "CSSA\t\t: 0x%08x\n" , |
91 | readl(addr: gdd + SSI_GDD_CSSA_REG(lch))); |
92 | seq_printf(m, fmt: "CDSA\t\t: 0x%08x\n" , |
93 | readl(addr: gdd + SSI_GDD_CDSA_REG(lch))); |
94 | seq_printf(m, fmt: "CEN\t\t: 0x%04x\n" , |
95 | readw(addr: gdd + SSI_GDD_CEN_REG(lch))); |
96 | seq_printf(m, fmt: "CSAC\t\t: 0x%04x\n" , |
97 | readw(addr: gdd + SSI_GDD_CSAC_REG(lch))); |
98 | seq_printf(m, fmt: "CDAC\t\t: 0x%04x\n" , |
99 | readw(addr: gdd + SSI_GDD_CDAC_REG(lch))); |
100 | seq_printf(m, fmt: "CLNK_CTRL\t: 0x%04x\n" , |
101 | readw(addr: gdd + SSI_GDD_CLNK_CTRL_REG(lch))); |
102 | } |
103 | |
104 | pm_runtime_put(dev: ssi->device.parent); |
105 | |
106 | return 0; |
107 | } |
108 | |
109 | DEFINE_SHOW_ATTRIBUTE(ssi_regs); |
110 | DEFINE_SHOW_ATTRIBUTE(ssi_gdd_regs); |
111 | |
112 | static int ssi_debug_add_ctrl(struct hsi_controller *ssi) |
113 | { |
114 | struct omap_ssi_controller *omap_ssi = hsi_controller_drvdata(hsi: ssi); |
115 | struct dentry *dir; |
116 | |
117 | /* SSI controller */ |
118 | omap_ssi->dir = debugfs_create_dir(name: dev_name(dev: &ssi->device), NULL); |
119 | if (!omap_ssi->dir) |
120 | return -ENOMEM; |
121 | |
122 | debugfs_create_file(name: "regs" , S_IRUGO, parent: omap_ssi->dir, data: ssi, |
123 | fops: &ssi_regs_fops); |
124 | /* SSI GDD (DMA) */ |
125 | dir = debugfs_create_dir(name: "gdd" , parent: omap_ssi->dir); |
126 | if (!dir) |
127 | goto rback; |
128 | debugfs_create_file(name: "regs" , S_IRUGO, parent: dir, data: ssi, fops: &ssi_gdd_regs_fops); |
129 | |
130 | return 0; |
131 | rback: |
132 | debugfs_remove_recursive(dentry: omap_ssi->dir); |
133 | |
134 | return -ENOMEM; |
135 | } |
136 | |
137 | static void ssi_debug_remove_ctrl(struct hsi_controller *ssi) |
138 | { |
139 | struct omap_ssi_controller *omap_ssi = hsi_controller_drvdata(hsi: ssi); |
140 | |
141 | debugfs_remove_recursive(dentry: omap_ssi->dir); |
142 | } |
143 | #endif /* CONFIG_DEBUG_FS */ |
144 | |
145 | /* |
146 | * FIXME: Horrible HACK needed until we remove the useless wakeline test |
147 | * in the CMT. To be removed !!!! |
148 | */ |
149 | void ssi_waketest(struct hsi_client *cl, unsigned int enable) |
150 | { |
151 | struct hsi_port *port = hsi_get_port(cl); |
152 | struct omap_ssi_port *omap_port = hsi_port_drvdata(port); |
153 | struct hsi_controller *ssi = to_hsi_controller(port->device.parent); |
154 | struct omap_ssi_controller *omap_ssi = hsi_controller_drvdata(hsi: ssi); |
155 | |
156 | omap_port->wktest = !!enable; |
157 | if (omap_port->wktest) { |
158 | pm_runtime_get_sync(dev: ssi->device.parent); |
159 | writel_relaxed(SSI_WAKE(0), |
160 | omap_ssi->sys + SSI_SET_WAKE_REG(port->num)); |
161 | } else { |
162 | writel_relaxed(SSI_WAKE(0), |
163 | omap_ssi->sys + SSI_CLEAR_WAKE_REG(port->num)); |
164 | pm_runtime_put(dev: ssi->device.parent); |
165 | } |
166 | } |
167 | EXPORT_SYMBOL_GPL(ssi_waketest); |
168 | |
169 | static void ssi_gdd_complete(struct hsi_controller *ssi, unsigned int lch) |
170 | { |
171 | struct omap_ssi_controller *omap_ssi = hsi_controller_drvdata(hsi: ssi); |
172 | struct hsi_msg *msg = omap_ssi->gdd_trn[lch].msg; |
173 | struct hsi_port *port = to_hsi_port(msg->cl->device.parent); |
174 | struct omap_ssi_port *omap_port = hsi_port_drvdata(port); |
175 | unsigned int dir; |
176 | u32 csr; |
177 | u32 val; |
178 | |
179 | spin_lock(lock: &omap_ssi->lock); |
180 | |
181 | val = readl(addr: omap_ssi->sys + SSI_GDD_MPU_IRQ_ENABLE_REG); |
182 | val &= ~SSI_GDD_LCH(lch); |
183 | writel_relaxed(val, omap_ssi->sys + SSI_GDD_MPU_IRQ_ENABLE_REG); |
184 | |
185 | if (msg->ttype == HSI_MSG_READ) { |
186 | dir = DMA_FROM_DEVICE; |
187 | val = SSI_DATAAVAILABLE(msg->channel); |
188 | pm_runtime_put(dev: omap_port->pdev); |
189 | } else { |
190 | dir = DMA_TO_DEVICE; |
191 | val = SSI_DATAACCEPT(msg->channel); |
192 | /* Keep clocks reference for write pio event */ |
193 | } |
194 | dma_unmap_sg(&ssi->device, msg->sgt.sgl, msg->sgt.nents, dir); |
195 | csr = readw(addr: omap_ssi->gdd + SSI_GDD_CSR_REG(lch)); |
196 | omap_ssi->gdd_trn[lch].msg = NULL; /* release GDD lch */ |
197 | dev_dbg(&port->device, "DMA completed ch %d ttype %d\n" , |
198 | msg->channel, msg->ttype); |
199 | spin_unlock(lock: &omap_ssi->lock); |
200 | if (csr & SSI_CSR_TOUR) { /* Timeout error */ |
201 | msg->status = HSI_STATUS_ERROR; |
202 | msg->actual_len = 0; |
203 | spin_lock(lock: &omap_port->lock); |
204 | list_del(entry: &msg->link); /* Dequeue msg */ |
205 | spin_unlock(lock: &omap_port->lock); |
206 | |
207 | list_add_tail(new: &msg->link, head: &omap_port->errqueue); |
208 | schedule_delayed_work(dwork: &omap_port->errqueue_work, delay: 0); |
209 | return; |
210 | } |
211 | spin_lock(lock: &omap_port->lock); |
212 | val |= readl(addr: omap_ssi->sys + SSI_MPU_ENABLE_REG(port->num, 0)); |
213 | writel_relaxed(val, omap_ssi->sys + SSI_MPU_ENABLE_REG(port->num, 0)); |
214 | spin_unlock(lock: &omap_port->lock); |
215 | |
216 | msg->status = HSI_STATUS_COMPLETED; |
217 | msg->actual_len = sg_dma_len(msg->sgt.sgl); |
218 | } |
219 | |
220 | static void ssi_gdd_tasklet(unsigned long dev) |
221 | { |
222 | struct hsi_controller *ssi = (struct hsi_controller *)dev; |
223 | struct omap_ssi_controller *omap_ssi = hsi_controller_drvdata(hsi: ssi); |
224 | void __iomem *sys = omap_ssi->sys; |
225 | unsigned int lch; |
226 | u32 status_reg; |
227 | |
228 | pm_runtime_get(dev: ssi->device.parent); |
229 | |
230 | if (!pm_runtime_active(dev: ssi->device.parent)) { |
231 | dev_warn(ssi->device.parent, "ssi_gdd_tasklet called without runtime PM!\n" ); |
232 | pm_runtime_put(dev: ssi->device.parent); |
233 | return; |
234 | } |
235 | |
236 | status_reg = readl(addr: sys + SSI_GDD_MPU_IRQ_STATUS_REG); |
237 | for (lch = 0; lch < SSI_MAX_GDD_LCH; lch++) { |
238 | if (status_reg & SSI_GDD_LCH(lch)) |
239 | ssi_gdd_complete(ssi, lch); |
240 | } |
241 | writel_relaxed(status_reg, sys + SSI_GDD_MPU_IRQ_STATUS_REG); |
242 | status_reg = readl(addr: sys + SSI_GDD_MPU_IRQ_STATUS_REG); |
243 | |
244 | pm_runtime_put(dev: ssi->device.parent); |
245 | |
246 | if (status_reg) |
247 | tasklet_hi_schedule(t: &omap_ssi->gdd_tasklet); |
248 | else |
249 | enable_irq(irq: omap_ssi->gdd_irq); |
250 | |
251 | } |
252 | |
253 | static irqreturn_t ssi_gdd_isr(int irq, void *ssi) |
254 | { |
255 | struct omap_ssi_controller *omap_ssi = hsi_controller_drvdata(hsi: ssi); |
256 | |
257 | tasklet_hi_schedule(t: &omap_ssi->gdd_tasklet); |
258 | disable_irq_nosync(irq); |
259 | |
260 | return IRQ_HANDLED; |
261 | } |
262 | |
263 | static unsigned long ssi_get_clk_rate(struct hsi_controller *ssi) |
264 | { |
265 | struct omap_ssi_controller *omap_ssi = hsi_controller_drvdata(hsi: ssi); |
266 | unsigned long rate = clk_get_rate(clk: omap_ssi->fck); |
267 | return rate; |
268 | } |
269 | |
270 | static int ssi_clk_event(struct notifier_block *nb, unsigned long event, |
271 | void *data) |
272 | { |
273 | struct omap_ssi_controller *omap_ssi = container_of(nb, |
274 | struct omap_ssi_controller, fck_nb); |
275 | struct hsi_controller *ssi = to_hsi_controller(omap_ssi->dev); |
276 | struct clk_notifier_data *clk_data = data; |
277 | struct omap_ssi_port *omap_port; |
278 | int i; |
279 | |
280 | switch (event) { |
281 | case PRE_RATE_CHANGE: |
282 | dev_dbg(&ssi->device, "pre rate change\n" ); |
283 | |
284 | for (i = 0; i < ssi->num_ports; i++) { |
285 | omap_port = omap_ssi->port[i]; |
286 | |
287 | if (!omap_port) |
288 | continue; |
289 | |
290 | /* Workaround for SWBREAK + CAwake down race in CMT */ |
291 | disable_irq(irq: omap_port->wake_irq); |
292 | |
293 | /* stop all ssi communication */ |
294 | pinctrl_pm_select_idle_state(dev: omap_port->pdev); |
295 | udelay(1); /* wait for racing frames */ |
296 | } |
297 | |
298 | break; |
299 | case ABORT_RATE_CHANGE: |
300 | dev_dbg(&ssi->device, "abort rate change\n" ); |
301 | fallthrough; |
302 | case POST_RATE_CHANGE: |
303 | dev_dbg(&ssi->device, "post rate change (%lu -> %lu)\n" , |
304 | clk_data->old_rate, clk_data->new_rate); |
305 | omap_ssi->fck_rate = DIV_ROUND_CLOSEST(clk_data->new_rate, 1000); /* kHz */ |
306 | |
307 | for (i = 0; i < ssi->num_ports; i++) { |
308 | omap_port = omap_ssi->port[i]; |
309 | |
310 | if (!omap_port) |
311 | continue; |
312 | |
313 | omap_ssi_port_update_fclk(ssi, omap_port); |
314 | |
315 | /* resume ssi communication */ |
316 | pinctrl_pm_select_default_state(dev: omap_port->pdev); |
317 | enable_irq(irq: omap_port->wake_irq); |
318 | } |
319 | |
320 | break; |
321 | default: |
322 | break; |
323 | } |
324 | |
325 | return NOTIFY_DONE; |
326 | } |
327 | |
328 | static int ssi_get_iomem(struct platform_device *pd, |
329 | const char *name, void __iomem **pbase, dma_addr_t *phy) |
330 | { |
331 | struct resource *mem; |
332 | void __iomem *base; |
333 | struct hsi_controller *ssi = platform_get_drvdata(pdev: pd); |
334 | |
335 | mem = platform_get_resource_byname(pd, IORESOURCE_MEM, name); |
336 | base = devm_ioremap_resource(dev: &ssi->device, res: mem); |
337 | if (IS_ERR(ptr: base)) |
338 | return PTR_ERR(ptr: base); |
339 | |
340 | *pbase = base; |
341 | |
342 | if (phy) |
343 | *phy = mem->start; |
344 | |
345 | return 0; |
346 | } |
347 | |
348 | static int ssi_add_controller(struct hsi_controller *ssi, |
349 | struct platform_device *pd) |
350 | { |
351 | struct omap_ssi_controller *omap_ssi; |
352 | int err; |
353 | |
354 | omap_ssi = devm_kzalloc(dev: &ssi->device, size: sizeof(*omap_ssi), GFP_KERNEL); |
355 | if (!omap_ssi) |
356 | return -ENOMEM; |
357 | |
358 | err = ida_alloc(ida: &platform_omap_ssi_ida, GFP_KERNEL); |
359 | if (err < 0) |
360 | return err; |
361 | ssi->id = err; |
362 | |
363 | ssi->owner = THIS_MODULE; |
364 | ssi->device.parent = &pd->dev; |
365 | dev_set_name(dev: &ssi->device, name: "ssi%d" , ssi->id); |
366 | hsi_controller_set_drvdata(hsi: ssi, data: omap_ssi); |
367 | omap_ssi->dev = &ssi->device; |
368 | err = ssi_get_iomem(pd, name: "sys" , pbase: &omap_ssi->sys, NULL); |
369 | if (err < 0) |
370 | goto out_err; |
371 | err = ssi_get_iomem(pd, name: "gdd" , pbase: &omap_ssi->gdd, NULL); |
372 | if (err < 0) |
373 | goto out_err; |
374 | err = platform_get_irq_byname(pd, "gdd_mpu" ); |
375 | if (err < 0) |
376 | goto out_err; |
377 | omap_ssi->gdd_irq = err; |
378 | tasklet_init(t: &omap_ssi->gdd_tasklet, func: ssi_gdd_tasklet, |
379 | data: (unsigned long)ssi); |
380 | err = devm_request_irq(dev: &ssi->device, irq: omap_ssi->gdd_irq, handler: ssi_gdd_isr, |
381 | irqflags: 0, devname: "gdd_mpu" , dev_id: ssi); |
382 | if (err < 0) { |
383 | dev_err(&ssi->device, "Request GDD IRQ %d failed (%d)" , |
384 | omap_ssi->gdd_irq, err); |
385 | goto out_err; |
386 | } |
387 | |
388 | omap_ssi->port = devm_kcalloc(dev: &ssi->device, n: ssi->num_ports, |
389 | size: sizeof(*omap_ssi->port), GFP_KERNEL); |
390 | if (!omap_ssi->port) { |
391 | err = -ENOMEM; |
392 | goto out_err; |
393 | } |
394 | |
395 | omap_ssi->fck = devm_clk_get(dev: &ssi->device, id: "ssi_ssr_fck" ); |
396 | if (IS_ERR(ptr: omap_ssi->fck)) { |
397 | dev_err(&pd->dev, "Could not acquire clock \"ssi_ssr_fck\": %li\n" , |
398 | PTR_ERR(omap_ssi->fck)); |
399 | err = -ENODEV; |
400 | goto out_err; |
401 | } |
402 | |
403 | omap_ssi->fck_nb.notifier_call = ssi_clk_event; |
404 | omap_ssi->fck_nb.priority = INT_MAX; |
405 | clk_notifier_register(clk: omap_ssi->fck, nb: &omap_ssi->fck_nb); |
406 | |
407 | /* TODO: find register, which can be used to detect context loss */ |
408 | omap_ssi->get_loss = NULL; |
409 | |
410 | omap_ssi->max_speed = UINT_MAX; |
411 | spin_lock_init(&omap_ssi->lock); |
412 | err = hsi_register_controller(hsi: ssi); |
413 | |
414 | if (err < 0) |
415 | goto out_err; |
416 | |
417 | return 0; |
418 | |
419 | out_err: |
420 | ida_free(&platform_omap_ssi_ida, id: ssi->id); |
421 | return err; |
422 | } |
423 | |
424 | static int ssi_hw_init(struct hsi_controller *ssi) |
425 | { |
426 | struct omap_ssi_controller *omap_ssi = hsi_controller_drvdata(hsi: ssi); |
427 | int err; |
428 | |
429 | err = pm_runtime_resume_and_get(dev: ssi->device.parent); |
430 | if (err < 0) { |
431 | dev_err(&ssi->device, "runtime PM failed %d\n" , err); |
432 | return err; |
433 | } |
434 | /* Resetting GDD */ |
435 | writel_relaxed(SSI_SWRESET, omap_ssi->gdd + SSI_GDD_GRST_REG); |
436 | /* Get FCK rate in kHz */ |
437 | omap_ssi->fck_rate = DIV_ROUND_CLOSEST(ssi_get_clk_rate(ssi), 1000); |
438 | dev_dbg(&ssi->device, "SSI fck rate %lu kHz\n" , omap_ssi->fck_rate); |
439 | |
440 | writel_relaxed(SSI_CLK_AUTOGATING_ON, omap_ssi->sys + SSI_GDD_GCR_REG); |
441 | omap_ssi->gdd_gcr = SSI_CLK_AUTOGATING_ON; |
442 | pm_runtime_put_sync(dev: ssi->device.parent); |
443 | |
444 | return 0; |
445 | } |
446 | |
447 | static void ssi_remove_controller(struct hsi_controller *ssi) |
448 | { |
449 | struct omap_ssi_controller *omap_ssi = hsi_controller_drvdata(hsi: ssi); |
450 | int id = ssi->id; |
451 | tasklet_kill(t: &omap_ssi->gdd_tasklet); |
452 | hsi_unregister_controller(hsi: ssi); |
453 | clk_notifier_unregister(clk: omap_ssi->fck, nb: &omap_ssi->fck_nb); |
454 | ida_free(&platform_omap_ssi_ida, id); |
455 | } |
456 | |
457 | static inline int ssi_of_get_available_ports_count(const struct device_node *np) |
458 | { |
459 | struct device_node *child; |
460 | int num = 0; |
461 | |
462 | for_each_available_child_of_node(np, child) |
463 | if (of_device_is_compatible(device: child, "ti,omap3-ssi-port" )) |
464 | num++; |
465 | |
466 | return num; |
467 | } |
468 | |
469 | static int ssi_remove_ports(struct device *dev, void *c) |
470 | { |
471 | struct platform_device *pdev = to_platform_device(dev); |
472 | |
473 | if (!dev->of_node) |
474 | return 0; |
475 | |
476 | of_node_clear_flag(n: dev->of_node, OF_POPULATED); |
477 | of_device_unregister(ofdev: pdev); |
478 | |
479 | return 0; |
480 | } |
481 | |
482 | static int ssi_probe(struct platform_device *pd) |
483 | { |
484 | struct platform_device *childpdev; |
485 | struct device_node *np = pd->dev.of_node; |
486 | struct device_node *child; |
487 | struct hsi_controller *ssi; |
488 | int err; |
489 | int num_ports; |
490 | |
491 | if (!np) { |
492 | dev_err(&pd->dev, "missing device tree data\n" ); |
493 | return -EINVAL; |
494 | } |
495 | |
496 | num_ports = ssi_of_get_available_ports_count(np); |
497 | |
498 | ssi = hsi_alloc_controller(n_ports: num_ports, GFP_KERNEL); |
499 | if (!ssi) { |
500 | dev_err(&pd->dev, "No memory for controller\n" ); |
501 | return -ENOMEM; |
502 | } |
503 | |
504 | platform_set_drvdata(pdev: pd, data: ssi); |
505 | |
506 | err = ssi_add_controller(ssi, pd); |
507 | if (err < 0) { |
508 | hsi_put_controller(hsi: ssi); |
509 | goto out1; |
510 | } |
511 | |
512 | pm_runtime_enable(dev: &pd->dev); |
513 | |
514 | err = ssi_hw_init(ssi); |
515 | if (err < 0) |
516 | goto out2; |
517 | #ifdef CONFIG_DEBUG_FS |
518 | err = ssi_debug_add_ctrl(ssi); |
519 | if (err < 0) |
520 | goto out2; |
521 | #endif |
522 | |
523 | for_each_available_child_of_node(np, child) { |
524 | if (!of_device_is_compatible(device: child, "ti,omap3-ssi-port" )) |
525 | continue; |
526 | |
527 | childpdev = of_platform_device_create(np: child, NULL, parent: &pd->dev); |
528 | if (!childpdev) { |
529 | err = -ENODEV; |
530 | dev_err(&pd->dev, "failed to create ssi controller port\n" ); |
531 | of_node_put(node: child); |
532 | goto out3; |
533 | } |
534 | } |
535 | |
536 | dev_info(&pd->dev, "ssi controller %d initialized (%d ports)!\n" , |
537 | ssi->id, num_ports); |
538 | return err; |
539 | out3: |
540 | device_for_each_child(dev: &pd->dev, NULL, fn: ssi_remove_ports); |
541 | out2: |
542 | ssi_remove_controller(ssi); |
543 | pm_runtime_disable(dev: &pd->dev); |
544 | out1: |
545 | platform_set_drvdata(pdev: pd, NULL); |
546 | |
547 | return err; |
548 | } |
549 | |
550 | static int ssi_remove(struct platform_device *pd) |
551 | { |
552 | struct hsi_controller *ssi = platform_get_drvdata(pdev: pd); |
553 | |
554 | /* cleanup of of_platform_populate() call */ |
555 | device_for_each_child(dev: &pd->dev, NULL, fn: ssi_remove_ports); |
556 | |
557 | #ifdef CONFIG_DEBUG_FS |
558 | ssi_debug_remove_ctrl(ssi); |
559 | #endif |
560 | ssi_remove_controller(ssi); |
561 | platform_set_drvdata(pdev: pd, NULL); |
562 | |
563 | pm_runtime_disable(dev: &pd->dev); |
564 | |
565 | return 0; |
566 | } |
567 | |
568 | #ifdef CONFIG_PM |
569 | static int omap_ssi_runtime_suspend(struct device *dev) |
570 | { |
571 | struct hsi_controller *ssi = dev_get_drvdata(dev); |
572 | struct omap_ssi_controller *omap_ssi = hsi_controller_drvdata(hsi: ssi); |
573 | |
574 | dev_dbg(dev, "runtime suspend!\n" ); |
575 | |
576 | if (omap_ssi->get_loss) |
577 | omap_ssi->loss_count = |
578 | omap_ssi->get_loss(ssi->device.parent); |
579 | |
580 | return 0; |
581 | } |
582 | |
583 | static int omap_ssi_runtime_resume(struct device *dev) |
584 | { |
585 | struct hsi_controller *ssi = dev_get_drvdata(dev); |
586 | struct omap_ssi_controller *omap_ssi = hsi_controller_drvdata(hsi: ssi); |
587 | |
588 | dev_dbg(dev, "runtime resume!\n" ); |
589 | |
590 | if ((omap_ssi->get_loss) && (omap_ssi->loss_count == |
591 | omap_ssi->get_loss(ssi->device.parent))) |
592 | return 0; |
593 | |
594 | writel_relaxed(omap_ssi->gdd_gcr, omap_ssi->gdd + SSI_GDD_GCR_REG); |
595 | |
596 | return 0; |
597 | } |
598 | |
599 | static const struct dev_pm_ops omap_ssi_pm_ops = { |
600 | SET_RUNTIME_PM_OPS(omap_ssi_runtime_suspend, omap_ssi_runtime_resume, |
601 | NULL) |
602 | }; |
603 | |
604 | #define DEV_PM_OPS (&omap_ssi_pm_ops) |
605 | #else |
606 | #define DEV_PM_OPS NULL |
607 | #endif |
608 | |
609 | #ifdef CONFIG_OF |
610 | static const struct of_device_id omap_ssi_of_match[] = { |
611 | { .compatible = "ti,omap3-ssi" , }, |
612 | {}, |
613 | }; |
614 | MODULE_DEVICE_TABLE(of, omap_ssi_of_match); |
615 | #else |
616 | #define omap_ssi_of_match NULL |
617 | #endif |
618 | |
619 | static struct platform_driver ssi_pdriver = { |
620 | .probe = ssi_probe, |
621 | .remove = ssi_remove, |
622 | .driver = { |
623 | .name = "omap_ssi" , |
624 | .pm = DEV_PM_OPS, |
625 | .of_match_table = omap_ssi_of_match, |
626 | }, |
627 | }; |
628 | |
629 | static int __init ssi_init(void) { |
630 | int ret; |
631 | |
632 | ret = platform_driver_register(&ssi_pdriver); |
633 | if (ret) |
634 | return ret; |
635 | |
636 | ret = platform_driver_register(&ssi_port_pdriver); |
637 | if (ret) { |
638 | platform_driver_unregister(&ssi_pdriver); |
639 | return ret; |
640 | } |
641 | |
642 | return 0; |
643 | } |
644 | module_init(ssi_init); |
645 | |
646 | static void __exit ssi_exit(void) { |
647 | platform_driver_unregister(&ssi_port_pdriver); |
648 | platform_driver_unregister(&ssi_pdriver); |
649 | } |
650 | module_exit(ssi_exit); |
651 | |
652 | MODULE_ALIAS("platform:omap_ssi" ); |
653 | MODULE_AUTHOR("Carlos Chinea <carlos.chinea@nokia.com>" ); |
654 | MODULE_AUTHOR("Sebastian Reichel <sre@kernel.org>" ); |
655 | MODULE_DESCRIPTION("Synchronous Serial Interface Driver" ); |
656 | MODULE_LICENSE("GPL v2" ); |
657 | |