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 | |
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(m: 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 | |
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, is_on: 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, is_on: 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 | |
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(lock: &musb->lock, flags); |
140 | |
141 | return retval; |
142 | } |
143 | |
144 | static int ux500_musb_init(struct musb *musb) |
145 | { |
146 | int status; |
147 | |
148 | musb->xceiv = usb_get_phy(type: USB_PHY_TYPE_USB2); |
149 | if (IS_ERR_OR_NULL(ptr: 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(x: musb->xceiv, nb: &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 | |
166 | static int ux500_musb_exit(struct musb *musb) |
167 | { |
168 | usb_unregister_notifier(x: musb->xceiv, nb: &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 * |
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(dev: &pdev->dev, size: sizeof(*pdata), GFP_KERNEL); |
196 | if (!pdata) |
197 | return NULL; |
198 | |
199 | mode = of_get_property(node: np, name: "dr_mode" , lenp: &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 | |
217 | static int ux500_probe(struct platform_device *pdev) |
218 | { |
219 | struct musb_hdrc_platform_data *pdata = dev_get_platdata(dev: &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(dev: &pdev->dev, size: sizeof(*glue), GFP_KERNEL); |
240 | if (!glue) |
241 | goto err0; |
242 | |
243 | musb = platform_device_alloc(name: "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(dev: &pdev->dev, NULL); |
250 | if (IS_ERR(ptr: clk)) { |
251 | dev_err(&pdev->dev, "failed to get clock\n" ); |
252 | ret = PTR_ERR(ptr: 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(dev: &musb->dev, dev2: &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, data: glue); |
275 | |
276 | ret = platform_device_add_resources(pdev: musb, res: pdev->resource, num: 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(pdev: musb, data: pdata, size: 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(pdev: 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(pdev: musb); |
301 | |
302 | err0: |
303 | return ret; |
304 | } |
305 | |
306 | static void 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(clk: glue->clk); |
312 | } |
313 | |
314 | #ifdef CONFIG_PM_SLEEP |
315 | static int ux500_suspend(struct device *dev) |
316 | { |
317 | struct ux500_glue *glue = dev_get_drvdata(dev); |
318 | struct musb *musb = glue_to_musb(glue); |
319 | |
320 | if (musb) |
321 | usb_phy_set_suspend(x: musb->xceiv, suspend: 1); |
322 | |
323 | clk_disable_unprepare(clk: glue->clk); |
324 | |
325 | return 0; |
326 | } |
327 | |
328 | static int ux500_resume(struct device *dev) |
329 | { |
330 | struct ux500_glue *glue = dev_get_drvdata(dev); |
331 | struct musb *musb = glue_to_musb(glue); |
332 | int ret; |
333 | |
334 | ret = clk_prepare_enable(clk: glue->clk); |
335 | if (ret) { |
336 | dev_err(dev, "failed to enable clock\n" ); |
337 | return ret; |
338 | } |
339 | |
340 | if (musb) |
341 | usb_phy_set_suspend(x: musb->xceiv, suspend: 0); |
342 | |
343 | return 0; |
344 | } |
345 | #endif |
346 | |
347 | static SIMPLE_DEV_PM_OPS(ux500_pm_ops, ux500_suspend, ux500_resume); |
348 | |
349 | static const struct of_device_id ux500_match[] = { |
350 | { .compatible = "stericsson,db8500-musb" , }, |
351 | {} |
352 | }; |
353 | |
354 | MODULE_DEVICE_TABLE(of, ux500_match); |
355 | |
356 | static struct platform_driver ux500_driver = { |
357 | .probe = ux500_probe, |
358 | .remove_new = ux500_remove, |
359 | .driver = { |
360 | .name = "musb-ux500" , |
361 | .pm = &ux500_pm_ops, |
362 | .of_match_table = ux500_match, |
363 | }, |
364 | }; |
365 | |
366 | MODULE_DESCRIPTION("UX500 MUSB Glue Layer" ); |
367 | MODULE_AUTHOR("Mian Yousaf Kaukab <mian.yousaf.kaukab@stericsson.com>" ); |
368 | MODULE_LICENSE("GPL v2" ); |
369 | module_platform_driver(ux500_driver); |
370 | |