2 * ehci-omap.c - driver for USBHOST on OMAP3/4 processors
4 * Bus Glue for the EHCI controllers in OMAP3/4
5 * Tested on several OMAP3 boards, and OMAP4 Pandaboard
7 * Copyright (C) 2007-2011 Texas Instruments, Inc.
8 * Author: Vikram Pandita <vikram.pandita@ti.com>
9 * Author: Anand Gadiyar <gadiyar@ti.com>
10 * Author: Keshava Munegowda <keshava_mgowda@ti.com>
12 * Copyright (C) 2009 Nokia Corporation
13 * Contact: Felipe Balbi <felipe.balbi@nokia.com>
15 * Based on "ehci-fsl.c" and "ehci-au1xxx.c" ehci glue layers
17 * This program is free software; you can redistribute it and/or modify
18 * it under the terms of the GNU General Public License as published by
19 * the Free Software Foundation; either version 2 of the License, or
20 * (at your option) any later version.
22 * This program is distributed in the hope that it will be useful,
23 * but WITHOUT ANY WARRANTY; without even the implied warranty of
24 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
25 * GNU General Public License for more details.
27 * You should have received a copy of the GNU General Public License
28 * along with this program; if not, write to the Free Software
29 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
31 * TODO (last updated Feb 27, 2010):
34 * - add suspend/resume
35 * - add HSIC and TLL support
36 * - convert to use hwmod and runtime PM
39 #include <linux/kernel.h>
40 #include <linux/module.h>
42 #include <linux/platform_device.h>
43 #include <linux/slab.h>
44 #include <linux/usb/ulpi.h>
45 #include <linux/regulator/consumer.h>
46 #include <linux/pm_runtime.h>
47 #include <linux/gpio.h>
48 #include <linux/clk.h>
49 #include <linux/usb.h>
50 #include <linux/usb/hcd.h>
54 #include <linux/platform_data/usb-omap.h>
56 /* EHCI Register Set */
57 #define EHCI_INSNREG04 (0xA0)
58 #define EHCI_INSNREG04_DISABLE_UNSUSPEND (1 << 5)
59 #define EHCI_INSNREG05_ULPI (0xA4)
60 #define EHCI_INSNREG05_ULPI_CONTROL_SHIFT 31
61 #define EHCI_INSNREG05_ULPI_PORTSEL_SHIFT 24
62 #define EHCI_INSNREG05_ULPI_OPSEL_SHIFT 22
63 #define EHCI_INSNREG05_ULPI_REGADD_SHIFT 16
64 #define EHCI_INSNREG05_ULPI_EXTREGADD_SHIFT 8
65 #define EHCI_INSNREG05_ULPI_WRDATA_SHIFT 0
67 #define DRIVER_DESC "OMAP-EHCI Host Controller driver"
69 static const char hcd_name[] = "ehci-omap";
71 /*-------------------------------------------------------------------------*/
74 static inline void ehci_write(void __iomem *base, u32 reg, u32 val)
76 __raw_writel(val, base + reg);
79 static inline u32 ehci_read(void __iomem *base, u32 reg)
81 return __raw_readl(base + reg);
85 static void omap_ehci_soft_phy_reset(struct usb_hcd *hcd, u8 port)
87 unsigned long timeout = jiffies + msecs_to_jiffies(1000);
90 reg = ULPI_FUNC_CTRL_RESET
91 /* FUNCTION_CTRL_SET register */
92 | (ULPI_SET(ULPI_FUNC_CTRL) << EHCI_INSNREG05_ULPI_REGADD_SHIFT)
94 | (2 << EHCI_INSNREG05_ULPI_OPSEL_SHIFT)
96 | ((port + 1) << EHCI_INSNREG05_ULPI_PORTSEL_SHIFT)
97 /* start ULPI access*/
98 | (1 << EHCI_INSNREG05_ULPI_CONTROL_SHIFT);
100 ehci_write(hcd->regs, EHCI_INSNREG05_ULPI, reg);
102 /* Wait for ULPI access completion */
103 while ((ehci_read(hcd->regs, EHCI_INSNREG05_ULPI)
104 & (1 << EHCI_INSNREG05_ULPI_CONTROL_SHIFT))) {
107 if (time_after(jiffies, timeout)) {
108 dev_dbg(hcd->self.controller,
109 "phy reset operation timed out\n");
115 static int omap_ehci_init(struct usb_hcd *hcd)
117 struct ehci_hcd *ehci = hcd_to_ehci(hcd);
119 struct usbhs_omap_platform_data *pdata;
121 pdata = hcd->self.controller->platform_data;
123 /* Hold PHYs in reset while initializing EHCI controller */
124 if (pdata->phy_reset) {
125 if (gpio_is_valid(pdata->reset_gpio_port[0]))
126 gpio_set_value_cansleep(pdata->reset_gpio_port[0], 0);
128 if (gpio_is_valid(pdata->reset_gpio_port[1]))
129 gpio_set_value_cansleep(pdata->reset_gpio_port[1], 0);
131 /* Hold the PHY in RESET for enough time till DIR is high */
135 /* Soft reset the PHY using PHY reset command over ULPI */
136 if (pdata->port_mode[0] == OMAP_EHCI_PORT_MODE_PHY)
137 omap_ehci_soft_phy_reset(hcd, 0);
138 if (pdata->port_mode[1] == OMAP_EHCI_PORT_MODE_PHY)
139 omap_ehci_soft_phy_reset(hcd, 1);
141 /* we know this is the memory we want, no need to ioremap again */
142 ehci->caps = hcd->regs;
144 rc = ehci_setup(hcd);
146 if (pdata->phy_reset) {
147 /* Hold the PHY in RESET for enough time till
148 * PHY is settled and ready
152 if (gpio_is_valid(pdata->reset_gpio_port[0]))
153 gpio_set_value_cansleep(pdata->reset_gpio_port[0], 1);
155 if (gpio_is_valid(pdata->reset_gpio_port[1]))
156 gpio_set_value_cansleep(pdata->reset_gpio_port[1], 1);
162 static void disable_put_regulator(
163 struct usbhs_omap_platform_data *pdata)
167 for (i = 0 ; i < OMAP3_HS_USB_PORTS ; i++) {
168 if (pdata->regulator[i]) {
169 regulator_disable(pdata->regulator[i]);
170 regulator_put(pdata->regulator[i]);
175 /* configure so an HC device and id are always provided */
176 /* always called with process context; sleeping is OK */
178 static struct hc_driver __read_mostly ehci_omap_hc_driver;
180 static const struct ehci_driver_overrides ehci_omap_overrides __initdata = {
181 .reset = omap_ehci_init,
185 * ehci_hcd_omap_probe - initialize TI-based HCDs
187 * Allocates basic resources for this USB host controller, and
188 * then invokes the start() method for the HCD associated with it
189 * through the hotplug entry's driver_data.
191 static int ehci_hcd_omap_probe(struct platform_device *pdev)
193 struct device *dev = &pdev->dev;
194 struct usbhs_omap_platform_data *pdata = dev->platform_data;
195 struct resource *res;
207 dev_err(dev, "Missing parent device\n");
211 irq = platform_get_irq_byname(pdev, "ehci-irq");
213 dev_err(dev, "EHCI irq failed\n");
217 res = platform_get_resource_byname(pdev,
218 IORESOURCE_MEM, "ehci");
220 dev_err(dev, "UHH EHCI get resource failed\n");
224 regs = ioremap(res->start, resource_size(res));
226 dev_err(dev, "UHH EHCI ioremap failed\n");
230 hcd = usb_create_hcd(&ehci_omap_hc_driver, dev,
233 dev_err(dev, "failed to create hcd with err %d\n", ret);
238 hcd->rsrc_start = res->start;
239 hcd->rsrc_len = resource_size(res);
242 /* get ehci regulator and enable */
243 for (i = 0 ; i < OMAP3_HS_USB_PORTS ; i++) {
244 if (pdata->port_mode[i] != OMAP_EHCI_PORT_MODE_PHY) {
245 pdata->regulator[i] = NULL;
248 snprintf(supply, sizeof(supply), "hsusb%d", i);
249 pdata->regulator[i] = regulator_get(dev, supply);
250 if (IS_ERR(pdata->regulator[i])) {
251 pdata->regulator[i] = NULL;
253 "failed to get ehci port%d regulator\n", i);
255 regulator_enable(pdata->regulator[i]);
259 pm_runtime_enable(dev);
260 pm_runtime_get_sync(dev);
263 * An undocumented "feature" in the OMAP3 EHCI controller,
264 * causes suspended ports to be taken out of suspend when
265 * the USBCMD.Run/Stop bit is cleared (for example when
266 * we do ehci_bus_suspend).
267 * This breaks suspend-resume if the root-hub is allowed
268 * to suspend. Writing 1 to this undocumented register bit
269 * disables this feature and restores normal behavior.
271 ehci_write(regs, EHCI_INSNREG04,
272 EHCI_INSNREG04_DISABLE_UNSUSPEND);
274 ret = usb_add_hcd(hcd, irq, IRQF_SHARED);
276 dev_err(dev, "failed to add hcd with err %d\n", ret);
284 disable_put_regulator(pdata);
285 pm_runtime_put_sync(dev);
295 * ehci_hcd_omap_remove - shutdown processing for EHCI HCDs
296 * @pdev: USB Host Controller being removed
298 * Reverses the effect of usb_ehci_hcd_omap_probe(), first invoking
299 * the HCD's stop() method. It is always called from a thread
300 * context, normally "rmmod", "apmd", or something similar.
302 static int ehci_hcd_omap_remove(struct platform_device *pdev)
304 struct device *dev = &pdev->dev;
305 struct usb_hcd *hcd = dev_get_drvdata(dev);
308 disable_put_regulator(dev->platform_data);
312 pm_runtime_put_sync(dev);
313 pm_runtime_disable(dev);
318 static void ehci_hcd_omap_shutdown(struct platform_device *pdev)
320 struct usb_hcd *hcd = dev_get_drvdata(&pdev->dev);
322 if (hcd->driver->shutdown)
323 hcd->driver->shutdown(hcd);
326 static struct platform_driver ehci_hcd_omap_driver = {
327 .probe = ehci_hcd_omap_probe,
328 .remove = ehci_hcd_omap_remove,
329 .shutdown = ehci_hcd_omap_shutdown,
330 /*.suspend = ehci_hcd_omap_suspend, */
331 /*.resume = ehci_hcd_omap_resume, */
337 /*-------------------------------------------------------------------------*/
339 static int __init ehci_omap_init(void)
344 pr_info("%s: " DRIVER_DESC "\n", hcd_name);
346 ehci_init_driver(&ehci_omap_hc_driver, &ehci_omap_overrides);
347 return platform_driver_register(&ehci_hcd_omap_driver);
349 module_init(ehci_omap_init);
351 static void __exit ehci_omap_cleanup(void)
353 platform_driver_unregister(&ehci_hcd_omap_driver);
355 module_exit(ehci_omap_cleanup);
357 MODULE_ALIAS("platform:ehci-omap");
358 MODULE_AUTHOR("Texas Instruments, Inc.");
359 MODULE_AUTHOR("Felipe Balbi <felipe.balbi@nokia.com>");
361 MODULE_DESCRIPTION(DRIVER_DESC);
362 MODULE_LICENSE("GPL");