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8#include <linux/clk.h>
9#include <linux/interrupt.h>
10#include <linux/io.h>
11#include <linux/kernel.h>
12#include <linux/module.h>
13#include <linux/of_platform.h>
14#include <linux/platform_device.h>
15#include <linux/pm_runtime.h>
16
17#include "core.h"
18
19
20#define USB_WAKEUP_CTRL 0x00
21
22
23#define USB_WAKEUP_EN BIT(31)
24
25#define USB_WAKEUP_SS_CONN BIT(5)
26
27#define USB_WAKEUP_VBUS_SRC_SESS_VAL BIT(4)
28
29#define USB_WAKEUP_U3_EN BIT(3)
30
31#define USB_WAKEUP_ID_EN BIT(2)
32
33#define USB_WAKEUP_VBUS_EN BIT(1)
34
35#define USB_WAKEUP_DPDM_EN BIT(0)
36
37#define USB_WAKEUP_EN_MASK GENMASK(5, 0)
38
39
40#define USB_CTRL0 0x00
41#define USB_CTRL1 0x04
42
43#define USB_CTRL0_PORTPWR_EN BIT(12)
44#define USB_CTRL0_USB3_FIXED BIT(22)
45#define USB_CTRL0_USB2_FIXED BIT(23)
46
47#define USB_CTRL1_OC_POLARITY BIT(16)
48#define USB_CTRL1_PWR_POLARITY BIT(17)
49
50struct dwc3_imx8mp {
51 struct device *dev;
52 struct platform_device *dwc3;
53 void __iomem *hsio_blk_base;
54 void __iomem *glue_base;
55 struct clk *hsio_clk;
56 struct clk *suspend_clk;
57 int irq;
58 bool pm_suspended;
59 bool wakeup_pending;
60};
61
62static void imx8mp_configure_glue(struct dwc3_imx8mp *dwc3_imx)
63{
64 struct device *dev = dwc3_imx->dev;
65 u32 value;
66
67 if (!dwc3_imx->glue_base)
68 return;
69
70 value = readl(dwc3_imx->glue_base + USB_CTRL0);
71
72 if (device_property_read_bool(dev, "fsl,permanently-attached"))
73 value |= (USB_CTRL0_USB2_FIXED | USB_CTRL0_USB3_FIXED);
74 else
75 value &= ~(USB_CTRL0_USB2_FIXED | USB_CTRL0_USB3_FIXED);
76
77 if (device_property_read_bool(dev, "fsl,disable-port-power-control"))
78 value &= ~(USB_CTRL0_PORTPWR_EN);
79 else
80 value |= USB_CTRL0_PORTPWR_EN;
81
82 writel(value, dwc3_imx->glue_base + USB_CTRL0);
83
84 value = readl(dwc3_imx->glue_base + USB_CTRL1);
85 if (device_property_read_bool(dev, "fsl,over-current-active-low"))
86 value |= USB_CTRL1_OC_POLARITY;
87 else
88 value &= ~USB_CTRL1_OC_POLARITY;
89
90 if (device_property_read_bool(dev, "fsl,power-active-low"))
91 value |= USB_CTRL1_PWR_POLARITY;
92 else
93 value &= ~USB_CTRL1_PWR_POLARITY;
94
95 writel(value, dwc3_imx->glue_base + USB_CTRL1);
96}
97
98static void dwc3_imx8mp_wakeup_enable(struct dwc3_imx8mp *dwc3_imx)
99{
100 struct dwc3 *dwc3 = platform_get_drvdata(dwc3_imx->dwc3);
101 u32 val;
102
103 if (!dwc3)
104 return;
105
106 val = readl(dwc3_imx->hsio_blk_base + USB_WAKEUP_CTRL);
107
108 if ((dwc3->current_dr_role == DWC3_GCTL_PRTCAP_HOST) && dwc3->xhci)
109 val |= USB_WAKEUP_EN | USB_WAKEUP_SS_CONN |
110 USB_WAKEUP_U3_EN | USB_WAKEUP_DPDM_EN;
111 else if (dwc3->current_dr_role == DWC3_GCTL_PRTCAP_DEVICE)
112 val |= USB_WAKEUP_EN | USB_WAKEUP_VBUS_EN |
113 USB_WAKEUP_VBUS_SRC_SESS_VAL;
114
115 writel(val, dwc3_imx->hsio_blk_base + USB_WAKEUP_CTRL);
116}
117
118static void dwc3_imx8mp_wakeup_disable(struct dwc3_imx8mp *dwc3_imx)
119{
120 u32 val;
121
122 val = readl(dwc3_imx->hsio_blk_base + USB_WAKEUP_CTRL);
123 val &= ~(USB_WAKEUP_EN | USB_WAKEUP_EN_MASK);
124 writel(val, dwc3_imx->hsio_blk_base + USB_WAKEUP_CTRL);
125}
126
127static irqreturn_t dwc3_imx8mp_interrupt(int irq, void *_dwc3_imx)
128{
129 struct dwc3_imx8mp *dwc3_imx = _dwc3_imx;
130 struct dwc3 *dwc = platform_get_drvdata(dwc3_imx->dwc3);
131
132 if (!dwc3_imx->pm_suspended)
133 return IRQ_HANDLED;
134
135 disable_irq_nosync(dwc3_imx->irq);
136 dwc3_imx->wakeup_pending = true;
137
138 if ((dwc->current_dr_role == DWC3_GCTL_PRTCAP_HOST) && dwc->xhci)
139 pm_runtime_resume(&dwc->xhci->dev);
140 else if (dwc->current_dr_role == DWC3_GCTL_PRTCAP_DEVICE)
141 pm_runtime_get(dwc->dev);
142
143 return IRQ_HANDLED;
144}
145
146static int dwc3_imx8mp_probe(struct platform_device *pdev)
147{
148 struct device *dev = &pdev->dev;
149 struct device_node *dwc3_np, *node = dev->of_node;
150 struct dwc3_imx8mp *dwc3_imx;
151 struct resource *res;
152 int err, irq;
153
154 if (!node) {
155 dev_err(dev, "device node not found\n");
156 return -EINVAL;
157 }
158
159 dwc3_imx = devm_kzalloc(dev, sizeof(*dwc3_imx), GFP_KERNEL);
160 if (!dwc3_imx)
161 return -ENOMEM;
162
163 platform_set_drvdata(pdev, dwc3_imx);
164
165 dwc3_imx->dev = dev;
166
167 dwc3_imx->hsio_blk_base = devm_platform_ioremap_resource(pdev, 0);
168 if (IS_ERR(dwc3_imx->hsio_blk_base))
169 return PTR_ERR(dwc3_imx->hsio_blk_base);
170
171 res = platform_get_resource(pdev, IORESOURCE_MEM, 1);
172 if (!res) {
173 dev_warn(dev, "Base address for glue layer missing. Continuing without, some features are missing though.");
174 } else {
175 dwc3_imx->glue_base = devm_ioremap_resource(dev, res);
176 if (IS_ERR(dwc3_imx->glue_base))
177 return PTR_ERR(dwc3_imx->glue_base);
178 }
179
180 dwc3_imx->hsio_clk = devm_clk_get(dev, "hsio");
181 if (IS_ERR(dwc3_imx->hsio_clk)) {
182 err = PTR_ERR(dwc3_imx->hsio_clk);
183 dev_err(dev, "Failed to get hsio clk, err=%d\n", err);
184 return err;
185 }
186
187 err = clk_prepare_enable(dwc3_imx->hsio_clk);
188 if (err) {
189 dev_err(dev, "Failed to enable hsio clk, err=%d\n", err);
190 return err;
191 }
192
193 dwc3_imx->suspend_clk = devm_clk_get(dev, "suspend");
194 if (IS_ERR(dwc3_imx->suspend_clk)) {
195 err = PTR_ERR(dwc3_imx->suspend_clk);
196 dev_err(dev, "Failed to get suspend clk, err=%d\n", err);
197 goto disable_hsio_clk;
198 }
199
200 err = clk_prepare_enable(dwc3_imx->suspend_clk);
201 if (err) {
202 dev_err(dev, "Failed to enable suspend clk, err=%d\n", err);
203 goto disable_hsio_clk;
204 }
205
206 irq = platform_get_irq(pdev, 0);
207 if (irq < 0) {
208 err = irq;
209 goto disable_clks;
210 }
211 dwc3_imx->irq = irq;
212
213 imx8mp_configure_glue(dwc3_imx);
214
215 pm_runtime_set_active(dev);
216 pm_runtime_enable(dev);
217 err = pm_runtime_get_sync(dev);
218 if (err < 0)
219 goto disable_rpm;
220
221 dwc3_np = of_get_compatible_child(node, "snps,dwc3");
222 if (!dwc3_np) {
223 err = -ENODEV;
224 dev_err(dev, "failed to find dwc3 core child\n");
225 goto disable_rpm;
226 }
227
228 err = of_platform_populate(node, NULL, NULL, dev);
229 if (err) {
230 dev_err(&pdev->dev, "failed to create dwc3 core\n");
231 goto err_node_put;
232 }
233
234 dwc3_imx->dwc3 = of_find_device_by_node(dwc3_np);
235 if (!dwc3_imx->dwc3) {
236 dev_err(dev, "failed to get dwc3 platform device\n");
237 err = -ENODEV;
238 goto depopulate;
239 }
240 of_node_put(dwc3_np);
241
242 err = devm_request_threaded_irq(dev, irq, NULL, dwc3_imx8mp_interrupt,
243 IRQF_ONESHOT, dev_name(dev), dwc3_imx);
244 if (err) {
245 dev_err(dev, "failed to request IRQ #%d --> %d\n", irq, err);
246 goto depopulate;
247 }
248
249 device_set_wakeup_capable(dev, true);
250 pm_runtime_put(dev);
251
252 return 0;
253
254depopulate:
255 of_platform_depopulate(dev);
256err_node_put:
257 of_node_put(dwc3_np);
258disable_rpm:
259 pm_runtime_disable(dev);
260 pm_runtime_put_noidle(dev);
261disable_clks:
262 clk_disable_unprepare(dwc3_imx->suspend_clk);
263disable_hsio_clk:
264 clk_disable_unprepare(dwc3_imx->hsio_clk);
265
266 return err;
267}
268
269static int dwc3_imx8mp_remove(struct platform_device *pdev)
270{
271 struct dwc3_imx8mp *dwc3_imx = platform_get_drvdata(pdev);
272 struct device *dev = &pdev->dev;
273
274 pm_runtime_get_sync(dev);
275 of_platform_depopulate(dev);
276
277 clk_disable_unprepare(dwc3_imx->suspend_clk);
278 clk_disable_unprepare(dwc3_imx->hsio_clk);
279
280 pm_runtime_disable(dev);
281 pm_runtime_put_noidle(dev);
282 platform_set_drvdata(pdev, NULL);
283
284 return 0;
285}
286
287static int __maybe_unused dwc3_imx8mp_suspend(struct dwc3_imx8mp *dwc3_imx,
288 pm_message_t msg)
289{
290 if (dwc3_imx->pm_suspended)
291 return 0;
292
293
294 if (PMSG_IS_AUTO(msg) || device_may_wakeup(dwc3_imx->dev))
295 dwc3_imx8mp_wakeup_enable(dwc3_imx);
296
297 dwc3_imx->pm_suspended = true;
298
299 return 0;
300}
301
302static int __maybe_unused dwc3_imx8mp_resume(struct dwc3_imx8mp *dwc3_imx,
303 pm_message_t msg)
304{
305 struct dwc3 *dwc = platform_get_drvdata(dwc3_imx->dwc3);
306 int ret = 0;
307
308 if (!dwc3_imx->pm_suspended)
309 return 0;
310
311
312 dwc3_imx8mp_wakeup_disable(dwc3_imx);
313 dwc3_imx->pm_suspended = false;
314
315
316 imx8mp_configure_glue(dwc3_imx);
317
318 if (dwc3_imx->wakeup_pending) {
319 dwc3_imx->wakeup_pending = false;
320 if (dwc->current_dr_role == DWC3_GCTL_PRTCAP_DEVICE) {
321 pm_runtime_mark_last_busy(dwc->dev);
322 pm_runtime_put_autosuspend(dwc->dev);
323 } else {
324
325
326
327
328 usleep_range(9000, 10000);
329 }
330 enable_irq(dwc3_imx->irq);
331 }
332
333 return ret;
334}
335
336static int __maybe_unused dwc3_imx8mp_pm_suspend(struct device *dev)
337{
338 struct dwc3_imx8mp *dwc3_imx = dev_get_drvdata(dev);
339 int ret;
340
341 ret = dwc3_imx8mp_suspend(dwc3_imx, PMSG_SUSPEND);
342
343 if (device_may_wakeup(dwc3_imx->dev))
344 enable_irq_wake(dwc3_imx->irq);
345 else
346 clk_disable_unprepare(dwc3_imx->suspend_clk);
347
348 clk_disable_unprepare(dwc3_imx->hsio_clk);
349 dev_dbg(dev, "dwc3 imx8mp pm suspend.\n");
350
351 return ret;
352}
353
354static int __maybe_unused dwc3_imx8mp_pm_resume(struct device *dev)
355{
356 struct dwc3_imx8mp *dwc3_imx = dev_get_drvdata(dev);
357 int ret;
358
359 if (device_may_wakeup(dwc3_imx->dev)) {
360 disable_irq_wake(dwc3_imx->irq);
361 } else {
362 ret = clk_prepare_enable(dwc3_imx->suspend_clk);
363 if (ret)
364 return ret;
365 }
366
367 ret = clk_prepare_enable(dwc3_imx->hsio_clk);
368 if (ret)
369 return ret;
370
371 ret = dwc3_imx8mp_resume(dwc3_imx, PMSG_RESUME);
372
373 pm_runtime_disable(dev);
374 pm_runtime_set_active(dev);
375 pm_runtime_enable(dev);
376
377 dev_dbg(dev, "dwc3 imx8mp pm resume.\n");
378
379 return ret;
380}
381
382static int __maybe_unused dwc3_imx8mp_runtime_suspend(struct device *dev)
383{
384 struct dwc3_imx8mp *dwc3_imx = dev_get_drvdata(dev);
385
386 dev_dbg(dev, "dwc3 imx8mp runtime suspend.\n");
387
388 return dwc3_imx8mp_suspend(dwc3_imx, PMSG_AUTO_SUSPEND);
389}
390
391static int __maybe_unused dwc3_imx8mp_runtime_resume(struct device *dev)
392{
393 struct dwc3_imx8mp *dwc3_imx = dev_get_drvdata(dev);
394
395 dev_dbg(dev, "dwc3 imx8mp runtime resume.\n");
396
397 return dwc3_imx8mp_resume(dwc3_imx, PMSG_AUTO_RESUME);
398}
399
400static const struct dev_pm_ops dwc3_imx8mp_dev_pm_ops = {
401 SET_SYSTEM_SLEEP_PM_OPS(dwc3_imx8mp_pm_suspend, dwc3_imx8mp_pm_resume)
402 SET_RUNTIME_PM_OPS(dwc3_imx8mp_runtime_suspend,
403 dwc3_imx8mp_runtime_resume, NULL)
404};
405
406static const struct of_device_id dwc3_imx8mp_of_match[] = {
407 { .compatible = "fsl,imx8mp-dwc3", },
408 {},
409};
410MODULE_DEVICE_TABLE(of, dwc3_imx8mp_of_match);
411
412static struct platform_driver dwc3_imx8mp_driver = {
413 .probe = dwc3_imx8mp_probe,
414 .remove = dwc3_imx8mp_remove,
415 .driver = {
416 .name = "imx8mp-dwc3",
417 .pm = &dwc3_imx8mp_dev_pm_ops,
418 .of_match_table = dwc3_imx8mp_of_match,
419 },
420};
421
422module_platform_driver(dwc3_imx8mp_driver);
423
424MODULE_ALIAS("platform:imx8mp-dwc3");
425MODULE_AUTHOR("jun.li@nxp.com");
426MODULE_LICENSE("GPL v2");
427MODULE_DESCRIPTION("DesignWare USB3 imx8mp Glue Layer");
428
