1 // SPDX-License-Identifier: GPL-2.0+
2 /*
3 * Copyright (C) 2010 ST-Ericsson AB
4 * Mian Yousaf Kaukab <mian.yousaf.kaukab@stericsson.com>
5 *
6 * Based on omap2430.c
7 */
8
9 #include <linux/module.h>
10 #include <linux/kernel.h>
11 #include <linux/clk.h>
12 #include <linux/err.h>
13 #include <linux/io.h>
14 #include <linux/of.h>
15 #include <linux/platform_device.h>
16 #include <linux/usb/musb-ux500.h>
17
18 #include "musb_core.h"
19
20 static const struct musb_hdrc_config ux500_musb_hdrc_config = {
21 .multipoint = true,
22 .dyn_fifo = true,
23 .num_eps = 16,
24 .ram_bits = 16,
25 };
26
27 struct ux500_glue {
28 struct device *dev;
29 struct platform_device *musb;
30 struct clk *clk;
31 };
32 #define glue_to_musb(g) platform_get_drvdata(g->musb)
33
ux500_musb_set_vbus(struct musb * musb,int is_on)34 static void ux500_musb_set_vbus(struct musb *musb, int is_on)
35 {
36 u8 devctl;
37 unsigned long timeout = jiffies + msecs_to_jiffies(1000);
38 /* HDRC controls CPEN, but beware current surges during device
39 * connect. They can trigger transient overcurrent conditions
40 * that must be ignored.
41 */
42
43 devctl = musb_readb(musb->mregs, MUSB_DEVCTL);
44
45 if (is_on) {
46 if (musb->xceiv->otg->state == OTG_STATE_A_IDLE) {
47 /* start the session */
48 devctl |= MUSB_DEVCTL_SESSION;
49 musb_writeb(musb->mregs, MUSB_DEVCTL, devctl);
50 /*
51 * Wait for the musb to set as A device to enable the
52 * VBUS
53 */
54 while (musb_readb(musb->mregs, MUSB_DEVCTL) & 0x80) {
55
56 if (time_after(jiffies, timeout)) {
57 dev_err(musb->controller,
58 "configured as A device timeout");
59 break;
60 }
61 }
62
63 } else {
64 musb->is_active = 1;
65 musb->xceiv->otg->state = OTG_STATE_A_WAIT_VRISE;
66 devctl |= MUSB_DEVCTL_SESSION;
67 MUSB_HST_MODE(musb);
68 }
69 } else {
70 musb->is_active = 0;
71
72 /* NOTE: we're skipping A_WAIT_VFALL -> A_IDLE and jumping
73 * right to B_IDLE...
74 */
75 devctl &= ~MUSB_DEVCTL_SESSION;
76 MUSB_DEV_MODE(musb);
77 }
78 musb_writeb(musb->mregs, MUSB_DEVCTL, devctl);
79
80 /*
81 * Devctl values will be updated after vbus goes below
82 * session_valid. The time taken depends on the capacitance
83 * on VBUS line. The max discharge time can be upto 1 sec
84 * as per the spec. Typically on our platform, it is 200ms
85 */
86 if (!is_on)
87 mdelay(200);
88
89 dev_dbg(musb->controller, "VBUS %s, devctl %02x\n",
90 usb_otg_state_string(musb->xceiv->otg->state),
91 musb_readb(musb->mregs, MUSB_DEVCTL));
92 }
93
musb_otg_notifications(struct notifier_block * nb,unsigned long event,void * unused)94 static int musb_otg_notifications(struct notifier_block *nb,
95 unsigned long event, void *unused)
96 {
97 struct musb *musb = container_of(nb, struct musb, nb);
98
99 dev_dbg(musb->controller, "musb_otg_notifications %ld %s\n",
100 event, usb_otg_state_string(musb->xceiv->otg->state));
101
102 switch (event) {
103 case UX500_MUSB_ID:
104 dev_dbg(musb->controller, "ID GND\n");
105 ux500_musb_set_vbus(musb, 1);
106 break;
107 case UX500_MUSB_VBUS:
108 dev_dbg(musb->controller, "VBUS Connect\n");
109 break;
110 case UX500_MUSB_NONE:
111 dev_dbg(musb->controller, "VBUS Disconnect\n");
112 if (is_host_active(musb))
113 ux500_musb_set_vbus(musb, 0);
114 else
115 musb->xceiv->otg->state = OTG_STATE_B_IDLE;
116 break;
117 default:
118 dev_dbg(musb->controller, "ID float\n");
119 return NOTIFY_DONE;
120 }
121 return NOTIFY_OK;
122 }
123
ux500_musb_interrupt(int irq,void * __hci)124 static irqreturn_t ux500_musb_interrupt(int irq, void *__hci)
125 {
126 unsigned long flags;
127 irqreturn_t retval = IRQ_NONE;
128 struct musb *musb = __hci;
129
130 spin_lock_irqsave(&musb->lock, flags);
131
132 musb->int_usb = musb_readb(musb->mregs, MUSB_INTRUSB);
133 musb->int_tx = musb_readw(musb->mregs, MUSB_INTRTX);
134 musb->int_rx = musb_readw(musb->mregs, MUSB_INTRRX);
135
136 if (musb->int_usb || musb->int_tx || musb->int_rx)
137 retval = musb_interrupt(musb);
138
139 spin_unlock_irqrestore(&musb->lock, flags);
140
141 return retval;
142 }
143
ux500_musb_init(struct musb * musb)144 static int ux500_musb_init(struct musb *musb)
145 {
146 int status;
147
148 musb->xceiv = usb_get_phy(USB_PHY_TYPE_USB2);
149 if (IS_ERR_OR_NULL(musb->xceiv)) {
150 pr_err("HS USB OTG: no transceiver configured\n");
151 return -EPROBE_DEFER;
152 }
153
154 musb->nb.notifier_call = musb_otg_notifications;
155 status = usb_register_notifier(musb->xceiv, &musb->nb);
156 if (status < 0) {
157 dev_dbg(musb->controller, "notification register failed\n");
158 return status;
159 }
160
161 musb->isr = ux500_musb_interrupt;
162
163 return 0;
164 }
165
ux500_musb_exit(struct musb * musb)166 static int ux500_musb_exit(struct musb *musb)
167 {
168 usb_unregister_notifier(musb->xceiv, &musb->nb);
169
170 usb_put_phy(musb->xceiv);
171
172 return 0;
173 }
174
175 static const struct musb_platform_ops ux500_ops = {
176 .quirks = MUSB_DMA_UX500 | MUSB_INDEXED_EP,
177 #ifdef CONFIG_USB_UX500_DMA
178 .dma_init = ux500_dma_controller_create,
179 .dma_exit = ux500_dma_controller_destroy,
180 #endif
181 .init = ux500_musb_init,
182 .exit = ux500_musb_exit,
183 .fifo_mode = 5,
184
185 .set_vbus = ux500_musb_set_vbus,
186 };
187
188 static struct musb_hdrc_platform_data *
ux500_of_probe(struct platform_device * pdev,struct device_node * np)189 ux500_of_probe(struct platform_device *pdev, struct device_node *np)
190 {
191 struct musb_hdrc_platform_data *pdata;
192 const char *mode;
193 int strlen;
194
195 pdata = devm_kzalloc(&pdev->dev, sizeof(*pdata), GFP_KERNEL);
196 if (!pdata)
197 return NULL;
198
199 mode = of_get_property(np, "dr_mode", &strlen);
200 if (!mode) {
201 dev_err(&pdev->dev, "No 'dr_mode' property found\n");
202 return NULL;
203 }
204
205 if (strlen > 0) {
206 if (!strcmp(mode, "host"))
207 pdata->mode = MUSB_HOST;
208 if (!strcmp(mode, "otg"))
209 pdata->mode = MUSB_OTG;
210 if (!strcmp(mode, "peripheral"))
211 pdata->mode = MUSB_PERIPHERAL;
212 }
213
214 return pdata;
215 }
216
ux500_probe(struct platform_device * pdev)217 static int ux500_probe(struct platform_device *pdev)
218 {
219 struct musb_hdrc_platform_data *pdata = dev_get_platdata(&pdev->dev);
220 struct device_node *np = pdev->dev.of_node;
221 struct platform_device *musb;
222 struct ux500_glue *glue;
223 struct clk *clk;
224 int ret = -ENOMEM;
225
226 if (!pdata) {
227 if (np) {
228 pdata = ux500_of_probe(pdev, np);
229 if (!pdata)
230 goto err0;
231
232 pdev->dev.platform_data = pdata;
233 } else {
234 dev_err(&pdev->dev, "no pdata or device tree found\n");
235 goto err0;
236 }
237 }
238
239 glue = devm_kzalloc(&pdev->dev, sizeof(*glue), GFP_KERNEL);
240 if (!glue)
241 goto err0;
242
243 musb = platform_device_alloc("musb-hdrc", PLATFORM_DEVID_AUTO);
244 if (!musb) {
245 dev_err(&pdev->dev, "failed to allocate musb device\n");
246 goto err0;
247 }
248
249 clk = devm_clk_get(&pdev->dev, NULL);
250 if (IS_ERR(clk)) {
251 dev_err(&pdev->dev, "failed to get clock\n");
252 ret = PTR_ERR(clk);
253 goto err1;
254 }
255
256 ret = clk_prepare_enable(clk);
257 if (ret) {
258 dev_err(&pdev->dev, "failed to enable clock\n");
259 goto err1;
260 }
261
262 musb->dev.parent = &pdev->dev;
263 musb->dev.dma_mask = &pdev->dev.coherent_dma_mask;
264 musb->dev.coherent_dma_mask = pdev->dev.coherent_dma_mask;
265 device_set_of_node_from_dev(&musb->dev, &pdev->dev);
266
267 glue->dev = &pdev->dev;
268 glue->musb = musb;
269 glue->clk = clk;
270
271 pdata->platform_ops = &ux500_ops;
272 pdata->config = &ux500_musb_hdrc_config;
273
274 platform_set_drvdata(pdev, glue);
275
276 ret = platform_device_add_resources(musb, pdev->resource, pdev->num_resources);
277 if (ret) {
278 dev_err(&pdev->dev, "failed to add resources\n");
279 goto err2;
280 }
281
282 ret = platform_device_add_data(musb, pdata, sizeof(*pdata));
283 if (ret) {
284 dev_err(&pdev->dev, "failed to add platform_data\n");
285 goto err2;
286 }
287
288 ret = platform_device_add(musb);
289 if (ret) {
290 dev_err(&pdev->dev, "failed to register musb device\n");
291 goto err2;
292 }
293
294 return 0;
295
296 err2:
297 clk_disable_unprepare(clk);
298
299 err1:
300 platform_device_put(musb);
301
302 err0:
303 return ret;
304 }
305
ux500_remove(struct platform_device * pdev)306 static int ux500_remove(struct platform_device *pdev)
307 {
308 struct ux500_glue *glue = platform_get_drvdata(pdev);
309
310 platform_device_unregister(glue->musb);
311 clk_disable_unprepare(glue->clk);
312
313 return 0;
314 }
315
316 #ifdef CONFIG_PM_SLEEP
ux500_suspend(struct device * dev)317 static int ux500_suspend(struct device *dev)
318 {
319 struct ux500_glue *glue = dev_get_drvdata(dev);
320 struct musb *musb = glue_to_musb(glue);
321
322 if (musb)
323 usb_phy_set_suspend(musb->xceiv, 1);
324
325 clk_disable_unprepare(glue->clk);
326
327 return 0;
328 }
329
ux500_resume(struct device * dev)330 static int ux500_resume(struct device *dev)
331 {
332 struct ux500_glue *glue = dev_get_drvdata(dev);
333 struct musb *musb = glue_to_musb(glue);
334 int ret;
335
336 ret = clk_prepare_enable(glue->clk);
337 if (ret) {
338 dev_err(dev, "failed to enable clock\n");
339 return ret;
340 }
341
342 if (musb)
343 usb_phy_set_suspend(musb->xceiv, 0);
344
345 return 0;
346 }
347 #endif
348
349 static SIMPLE_DEV_PM_OPS(ux500_pm_ops, ux500_suspend, ux500_resume);
350
351 static const struct of_device_id ux500_match[] = {
352 { .compatible = "stericsson,db8500-musb", },
353 {}
354 };
355
356 MODULE_DEVICE_TABLE(of, ux500_match);
357
358 static struct platform_driver ux500_driver = {
359 .probe = ux500_probe,
360 .remove = ux500_remove,
361 .driver = {
362 .name = "musb-ux500",
363 .pm = &ux500_pm_ops,
364 .of_match_table = ux500_match,
365 },
366 };
367
368 MODULE_DESCRIPTION("UX500 MUSB Glue Layer");
369 MODULE_AUTHOR("Mian Yousaf Kaukab <mian.yousaf.kaukab@stericsson.com>");
370 MODULE_LICENSE("GPL v2");
371 module_platform_driver(ux500_driver);
372