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Linux/drivers/usb/musb/ux500.c

  1 /*
  2  * Copyright (C) 2010 ST-Ericsson AB
  3  * Mian Yousaf Kaukab <mian.yousaf.kaukab@stericsson.com>
  4  *
  5  * Based on omap2430.c
  6  *
  7  * This program is free software; you can redistribute it and/or modify
  8  * it under the terms of the GNU General Public License as published by
  9  * the Free Software Foundation; either version 2 of the License, or
 10  * (at your option) any later version.
 11  *
 12  * This program is distributed in the hope that it will be useful,
 13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
 14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 15  * GNU General Public License for more details.
 16  *
 17  * You should have received a copy of the GNU General Public License
 18  * along with this program; if not, write to the Free Software
 19  * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
 20  */
 21 
 22 #include <linux/module.h>
 23 #include <linux/kernel.h>
 24 #include <linux/clk.h>
 25 #include <linux/err.h>
 26 #include <linux/io.h>
 27 #include <linux/of.h>
 28 #include <linux/platform_device.h>
 29 #include <linux/usb/musb-ux500.h>
 30 
 31 #include "musb_core.h"
 32 
 33 static struct musb_hdrc_config ux500_musb_hdrc_config = {
 34         .multipoint     = true,
 35         .dyn_fifo       = true,
 36         .num_eps        = 16,
 37         .ram_bits       = 16,
 38 };
 39 
 40 struct ux500_glue {
 41         struct device           *dev;
 42         struct platform_device  *musb;
 43         struct clk              *clk;
 44 };
 45 #define glue_to_musb(g) platform_get_drvdata(g->musb)
 46 
 47 static void ux500_musb_set_vbus(struct musb *musb, int is_on)
 48 {
 49         u8            devctl;
 50         unsigned long timeout = jiffies + msecs_to_jiffies(1000);
 51         /* HDRC controls CPEN, but beware current surges during device
 52          * connect.  They can trigger transient overcurrent conditions
 53          * that must be ignored.
 54          */
 55 
 56         devctl = musb_readb(musb->mregs, MUSB_DEVCTL);
 57 
 58         if (is_on) {
 59                 if (musb->xceiv->state == OTG_STATE_A_IDLE) {
 60                         /* start the session */
 61                         devctl |= MUSB_DEVCTL_SESSION;
 62                         musb_writeb(musb->mregs, MUSB_DEVCTL, devctl);
 63                         /*
 64                          * Wait for the musb to set as A device to enable the
 65                          * VBUS
 66                          */
 67                         while (musb_readb(musb->mregs, MUSB_DEVCTL) & 0x80) {
 68 
 69                                 if (time_after(jiffies, timeout)) {
 70                                         dev_err(musb->controller,
 71                                         "configured as A device timeout");
 72                                         break;
 73                                 }
 74                         }
 75 
 76                 } else {
 77                         musb->is_active = 1;
 78                         musb->xceiv->otg->default_a = 1;
 79                         musb->xceiv->state = OTG_STATE_A_WAIT_VRISE;
 80                         devctl |= MUSB_DEVCTL_SESSION;
 81                         MUSB_HST_MODE(musb);
 82                 }
 83         } else {
 84                 musb->is_active = 0;
 85 
 86                 /* NOTE: we're skipping A_WAIT_VFALL -> A_IDLE and jumping
 87                  * right to B_IDLE...
 88                  */
 89                 musb->xceiv->otg->default_a = 0;
 90                 devctl &= ~MUSB_DEVCTL_SESSION;
 91                 MUSB_DEV_MODE(musb);
 92         }
 93         musb_writeb(musb->mregs, MUSB_DEVCTL, devctl);
 94 
 95         /*
 96          * Devctl values will be updated after vbus goes below
 97          * session_valid. The time taken depends on the capacitance
 98          * on VBUS line. The max discharge time can be upto 1 sec
 99          * as per the spec. Typically on our platform, it is 200ms
100          */
101         if (!is_on)
102                 mdelay(200);
103 
104         dev_dbg(musb->controller, "VBUS %s, devctl %02x\n",
105                 usb_otg_state_string(musb->xceiv->state),
106                 musb_readb(musb->mregs, MUSB_DEVCTL));
107 }
108 
109 static int musb_otg_notifications(struct notifier_block *nb,
110                 unsigned long event, void *unused)
111 {
112         struct musb *musb = container_of(nb, struct musb, nb);
113 
114         dev_dbg(musb->controller, "musb_otg_notifications %ld %s\n",
115                         event, usb_otg_state_string(musb->xceiv->state));
116 
117         switch (event) {
118         case UX500_MUSB_ID:
119                 dev_dbg(musb->controller, "ID GND\n");
120                 ux500_musb_set_vbus(musb, 1);
121                 break;
122         case UX500_MUSB_VBUS:
123                 dev_dbg(musb->controller, "VBUS Connect\n");
124                 break;
125         case UX500_MUSB_NONE:
126                 dev_dbg(musb->controller, "VBUS Disconnect\n");
127                 if (is_host_active(musb))
128                         ux500_musb_set_vbus(musb, 0);
129                 else
130                         musb->xceiv->state = OTG_STATE_B_IDLE;
131                 break;
132         default:
133                 dev_dbg(musb->controller, "ID float\n");
134                 return NOTIFY_DONE;
135         }
136         return NOTIFY_OK;
137 }
138 
139 static irqreturn_t ux500_musb_interrupt(int irq, void *__hci)
140 {
141         unsigned long   flags;
142         irqreturn_t     retval = IRQ_NONE;
143         struct musb     *musb = __hci;
144 
145         spin_lock_irqsave(&musb->lock, flags);
146 
147         musb->int_usb = musb_readb(musb->mregs, MUSB_INTRUSB);
148         musb->int_tx = musb_readw(musb->mregs, MUSB_INTRTX);
149         musb->int_rx = musb_readw(musb->mregs, MUSB_INTRRX);
150 
151         if (musb->int_usb || musb->int_tx || musb->int_rx)
152                 retval = musb_interrupt(musb);
153 
154         spin_unlock_irqrestore(&musb->lock, flags);
155 
156         return retval;
157 }
158 
159 static int ux500_musb_init(struct musb *musb)
160 {
161         int status;
162 
163         musb->xceiv = usb_get_phy(USB_PHY_TYPE_USB2);
164         if (IS_ERR_OR_NULL(musb->xceiv)) {
165                 pr_err("HS USB OTG: no transceiver configured\n");
166                 return -EPROBE_DEFER;
167         }
168 
169         musb->nb.notifier_call = musb_otg_notifications;
170         status = usb_register_notifier(musb->xceiv, &musb->nb);
171         if (status < 0) {
172                 dev_dbg(musb->controller, "notification register failed\n");
173                 return status;
174         }
175 
176         musb->isr = ux500_musb_interrupt;
177 
178         return 0;
179 }
180 
181 static int ux500_musb_exit(struct musb *musb)
182 {
183         usb_unregister_notifier(musb->xceiv, &musb->nb);
184 
185         usb_put_phy(musb->xceiv);
186 
187         return 0;
188 }
189 
190 static const struct musb_platform_ops ux500_ops = {
191         .init           = ux500_musb_init,
192         .exit           = ux500_musb_exit,
193 
194         .set_vbus       = ux500_musb_set_vbus,
195 };
196 
197 static struct musb_hdrc_platform_data *
198 ux500_of_probe(struct platform_device *pdev, struct device_node *np)
199 {
200         struct musb_hdrc_platform_data *pdata;
201         const char *mode;
202         int strlen;
203 
204         pdata = devm_kzalloc(&pdev->dev, sizeof(*pdata), GFP_KERNEL);
205         if (!pdata)
206                 return NULL;
207 
208         mode = of_get_property(np, "dr_mode", &strlen);
209         if (!mode) {
210                 dev_err(&pdev->dev, "No 'dr_mode' property found\n");
211                 return NULL;
212         }
213 
214         if (strlen > 0) {
215                 if (!strcmp(mode, "host"))
216                         pdata->mode = MUSB_HOST;
217                 if (!strcmp(mode, "otg"))
218                         pdata->mode = MUSB_OTG;
219                 if (!strcmp(mode, "peripheral"))
220                         pdata->mode = MUSB_PERIPHERAL;
221         }
222 
223         return pdata;
224 }
225 
226 static int ux500_probe(struct platform_device *pdev)
227 {
228         struct resource musb_resources[2];
229         struct musb_hdrc_platform_data  *pdata = dev_get_platdata(&pdev->dev);
230         struct device_node              *np = pdev->dev.of_node;
231         struct platform_device          *musb;
232         struct ux500_glue               *glue;
233         struct clk                      *clk;
234         int                             ret = -ENOMEM;
235 
236         if (!pdata) {
237                 if (np) {
238                         pdata = ux500_of_probe(pdev, np);
239                         if (!pdata)
240                                 goto err0;
241 
242                         pdev->dev.platform_data = pdata;
243                 } else {
244                         dev_err(&pdev->dev, "no pdata or device tree found\n");
245                         goto err0;
246                 }
247         }
248 
249         glue = kzalloc(sizeof(*glue), GFP_KERNEL);
250         if (!glue) {
251                 dev_err(&pdev->dev, "failed to allocate glue context\n");
252                 goto err0;
253         }
254 
255         musb = platform_device_alloc("musb-hdrc", PLATFORM_DEVID_AUTO);
256         if (!musb) {
257                 dev_err(&pdev->dev, "failed to allocate musb device\n");
258                 goto err1;
259         }
260 
261         clk = clk_get(&pdev->dev, NULL);
262         if (IS_ERR(clk)) {
263                 dev_err(&pdev->dev, "failed to get clock\n");
264                 ret = PTR_ERR(clk);
265                 goto err3;
266         }
267 
268         ret = clk_prepare_enable(clk);
269         if (ret) {
270                 dev_err(&pdev->dev, "failed to enable clock\n");
271                 goto err4;
272         }
273 
274         musb->dev.parent                = &pdev->dev;
275         musb->dev.dma_mask              = &pdev->dev.coherent_dma_mask;
276         musb->dev.coherent_dma_mask     = pdev->dev.coherent_dma_mask;
277         musb->dev.of_node               = pdev->dev.of_node;
278 
279         glue->dev                       = &pdev->dev;
280         glue->musb                      = musb;
281         glue->clk                       = clk;
282 
283         pdata->platform_ops             = &ux500_ops;
284         pdata->config                   = &ux500_musb_hdrc_config;
285 
286         platform_set_drvdata(pdev, glue);
287 
288         memset(musb_resources, 0x00, sizeof(*musb_resources) *
289                         ARRAY_SIZE(musb_resources));
290 
291         musb_resources[0].name = pdev->resource[0].name;
292         musb_resources[0].start = pdev->resource[0].start;
293         musb_resources[0].end = pdev->resource[0].end;
294         musb_resources[0].flags = pdev->resource[0].flags;
295 
296         musb_resources[1].name = pdev->resource[1].name;
297         musb_resources[1].start = pdev->resource[1].start;
298         musb_resources[1].end = pdev->resource[1].end;
299         musb_resources[1].flags = pdev->resource[1].flags;
300 
301         ret = platform_device_add_resources(musb, musb_resources,
302                         ARRAY_SIZE(musb_resources));
303         if (ret) {
304                 dev_err(&pdev->dev, "failed to add resources\n");
305                 goto err5;
306         }
307 
308         ret = platform_device_add_data(musb, pdata, sizeof(*pdata));
309         if (ret) {
310                 dev_err(&pdev->dev, "failed to add platform_data\n");
311                 goto err5;
312         }
313 
314         ret = platform_device_add(musb);
315         if (ret) {
316                 dev_err(&pdev->dev, "failed to register musb device\n");
317                 goto err5;
318         }
319 
320         return 0;
321 
322 err5:
323         clk_disable_unprepare(clk);
324 
325 err4:
326         clk_put(clk);
327 
328 err3:
329         platform_device_put(musb);
330 
331 err1:
332         kfree(glue);
333 
334 err0:
335         return ret;
336 }
337 
338 static int ux500_remove(struct platform_device *pdev)
339 {
340         struct ux500_glue       *glue = platform_get_drvdata(pdev);
341 
342         platform_device_unregister(glue->musb);
343         clk_disable_unprepare(glue->clk);
344         clk_put(glue->clk);
345         kfree(glue);
346 
347         return 0;
348 }
349 
350 #ifdef CONFIG_PM
351 static int ux500_suspend(struct device *dev)
352 {
353         struct ux500_glue       *glue = dev_get_drvdata(dev);
354         struct musb             *musb = glue_to_musb(glue);
355 
356         usb_phy_set_suspend(musb->xceiv, 1);
357         clk_disable_unprepare(glue->clk);
358 
359         return 0;
360 }
361 
362 static int ux500_resume(struct device *dev)
363 {
364         struct ux500_glue       *glue = dev_get_drvdata(dev);
365         struct musb             *musb = glue_to_musb(glue);
366         int                     ret;
367 
368         ret = clk_prepare_enable(glue->clk);
369         if (ret) {
370                 dev_err(dev, "failed to enable clock\n");
371                 return ret;
372         }
373 
374         usb_phy_set_suspend(musb->xceiv, 0);
375 
376         return 0;
377 }
378 #endif
379 
380 static SIMPLE_DEV_PM_OPS(ux500_pm_ops, ux500_suspend, ux500_resume);
381 
382 static const struct of_device_id ux500_match[] = {
383         { .compatible = "stericsson,db8500-musb", },
384         {}
385 };
386 
387 static struct platform_driver ux500_driver = {
388         .probe          = ux500_probe,
389         .remove         = ux500_remove,
390         .driver         = {
391                 .name   = "musb-ux500",
392                 .pm     = &ux500_pm_ops,
393                 .of_match_table = ux500_match,
394         },
395 };
396 
397 MODULE_DESCRIPTION("UX500 MUSB Glue Layer");
398 MODULE_AUTHOR("Mian Yousaf Kaukab <mian.yousaf.kaukab@stericsson.com>");
399 MODULE_LICENSE("GPL v2");
400 module_platform_driver(ux500_driver);
401 

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