2 * Copyright (C) 2010 ST-Ericsson AB
3 * Mian Yousaf Kaukab <mian.yousaf.kaukab@stericsson.com>
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.
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.
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.
22 #include <linux/module.h>
23 #include <linux/kernel.h>
24 #include <linux/clk.h>
25 #include <linux/err.h>
28 #include <linux/platform_device.h>
29 #include <linux/usb/musb-ux500.h>
31 #include "musb_core.h"
33 static struct musb_hdrc_config ux500_musb_hdrc_config = {
42 struct platform_device *musb;
45 #define glue_to_musb(g) platform_get_drvdata(g->musb)
47 static void ux500_musb_set_vbus(struct musb *musb, int is_on)
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.
56 devctl = musb_readb(musb->mregs, MUSB_DEVCTL);
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);
64 * Wait for the musb to set as A device to enable the
67 while (musb_readb(musb->mregs, MUSB_DEVCTL) & 0x80) {
69 if (time_after(jiffies, timeout)) {
70 dev_err(musb->controller,
71 "configured as A device timeout");
78 musb->xceiv->otg->default_a = 1;
79 musb->xceiv->state = OTG_STATE_A_WAIT_VRISE;
80 devctl |= MUSB_DEVCTL_SESSION;
86 /* NOTE: we're skipping A_WAIT_VFALL -> A_IDLE and jumping
89 musb->xceiv->otg->default_a = 0;
90 devctl &= ~MUSB_DEVCTL_SESSION;
93 musb_writeb(musb->mregs, MUSB_DEVCTL, devctl);
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
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));
109 static int musb_otg_notifications(struct notifier_block *nb,
110 unsigned long event, void *unused)
112 struct musb *musb = container_of(nb, struct musb, nb);
114 dev_dbg(musb->controller, "musb_otg_notifications %ld %s\n",
115 event, usb_otg_state_string(musb->xceiv->state));
119 dev_dbg(musb->controller, "ID GND\n");
120 ux500_musb_set_vbus(musb, 1);
122 case UX500_MUSB_VBUS:
123 dev_dbg(musb->controller, "VBUS Connect\n");
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);
130 musb->xceiv->state = OTG_STATE_B_IDLE;
133 dev_dbg(musb->controller, "ID float\n");
139 static irqreturn_t ux500_musb_interrupt(int irq, void *__hci)
142 irqreturn_t retval = IRQ_NONE;
143 struct musb *musb = __hci;
145 spin_lock_irqsave(&musb->lock, flags);
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);
151 if (musb->int_usb || musb->int_tx || musb->int_rx)
152 retval = musb_interrupt(musb);
154 spin_unlock_irqrestore(&musb->lock, flags);
159 static int ux500_musb_init(struct musb *musb)
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;
169 musb->nb.notifier_call = musb_otg_notifications;
170 status = usb_register_notifier(musb->xceiv, &musb->nb);
172 dev_dbg(musb->controller, "notification register failed\n");
176 musb->isr = ux500_musb_interrupt;
181 static int ux500_musb_exit(struct musb *musb)
183 usb_unregister_notifier(musb->xceiv, &musb->nb);
185 usb_put_phy(musb->xceiv);
190 static const struct musb_platform_ops ux500_ops = {
191 .init = ux500_musb_init,
192 .exit = ux500_musb_exit,
194 .set_vbus = ux500_musb_set_vbus,
197 static struct musb_hdrc_platform_data *
198 ux500_of_probe(struct platform_device *pdev, struct device_node *np)
200 struct musb_hdrc_platform_data *pdata;
204 pdata = devm_kzalloc(&pdev->dev, sizeof(*pdata), GFP_KERNEL);
208 mode = of_get_property(np, "dr_mode", &strlen);
210 dev_err(&pdev->dev, "No 'dr_mode' property found\n");
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;
226 static int ux500_probe(struct platform_device *pdev)
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;
238 pdata = ux500_of_probe(pdev, np);
242 pdev->dev.platform_data = pdata;
244 dev_err(&pdev->dev, "no pdata or device tree found\n");
249 glue = kzalloc(sizeof(*glue), GFP_KERNEL);
251 dev_err(&pdev->dev, "failed to allocate glue context\n");
255 musb = platform_device_alloc("musb-hdrc", PLATFORM_DEVID_AUTO);
257 dev_err(&pdev->dev, "failed to allocate musb device\n");
261 clk = clk_get(&pdev->dev, NULL);
263 dev_err(&pdev->dev, "failed to get clock\n");
268 ret = clk_prepare_enable(clk);
270 dev_err(&pdev->dev, "failed to enable clock\n");
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;
279 glue->dev = &pdev->dev;
283 pdata->platform_ops = &ux500_ops;
284 pdata->config = &ux500_musb_hdrc_config;
286 platform_set_drvdata(pdev, glue);
288 memset(musb_resources, 0x00, sizeof(*musb_resources) *
289 ARRAY_SIZE(musb_resources));
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;
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;
301 ret = platform_device_add_resources(musb, musb_resources,
302 ARRAY_SIZE(musb_resources));
304 dev_err(&pdev->dev, "failed to add resources\n");
308 ret = platform_device_add_data(musb, pdata, sizeof(*pdata));
310 dev_err(&pdev->dev, "failed to add platform_data\n");
314 ret = platform_device_add(musb);
316 dev_err(&pdev->dev, "failed to register musb device\n");
323 clk_disable_unprepare(clk);
329 platform_device_put(musb);
338 static int ux500_remove(struct platform_device *pdev)
340 struct ux500_glue *glue = platform_get_drvdata(pdev);
342 platform_device_unregister(glue->musb);
343 clk_disable_unprepare(glue->clk);
351 static int ux500_suspend(struct device *dev)
353 struct ux500_glue *glue = dev_get_drvdata(dev);
354 struct musb *musb = glue_to_musb(glue);
356 usb_phy_set_suspend(musb->xceiv, 1);
357 clk_disable_unprepare(glue->clk);
362 static int ux500_resume(struct device *dev)
364 struct ux500_glue *glue = dev_get_drvdata(dev);
365 struct musb *musb = glue_to_musb(glue);
368 ret = clk_prepare_enable(glue->clk);
370 dev_err(dev, "failed to enable clock\n");
374 usb_phy_set_suspend(musb->xceiv, 0);
380 static SIMPLE_DEV_PM_OPS(ux500_pm_ops, ux500_suspend, ux500_resume);
382 static const struct of_device_id ux500_match[] = {
383 { .compatible = "stericsson,db8500-musb", },
387 static struct platform_driver ux500_driver = {
388 .probe = ux500_probe,
389 .remove = ux500_remove,
391 .name = "musb-ux500",
393 .of_match_table = ux500_match,
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);