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) 2007-2013 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>
11 * Author: Roger Quadros <rogerq@ti.com>
13 * Copyright (C) 2009 Nokia Corporation
14 * Contact: Felipe Balbi <felipe.balbi@nokia.com>
16 * Based on "ehci-fsl.c" and "ehci-au1xxx.c" ehci glue layers
18 * This program is free software; you can redistribute it and/or modify
19 * it under the terms of the GNU General Public License as published by
20 * the Free Software Foundation; either version 2 of the License, or
21 * (at your option) any later version.
23 * This program is distributed in the hope that it will be useful,
24 * but WITHOUT ANY WARRANTY; without even the implied warranty of
25 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
26 * GNU General Public License for more details.
28 * You should have received a copy of the GNU General Public License
29 * along with this program; if not, write to the Free Software
30 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
32 * TODO (last updated Feb 27, 2010):
35 * - add suspend/resume
36 * - add HSIC and TLL support
37 * - convert to use hwmod and runtime PM
40 #include <linux/kernel.h>
41 #include <linux/module.h>
43 #include <linux/platform_device.h>
44 #include <linux/slab.h>
45 #include <linux/usb/ulpi.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 struct usb_phy *phy[OMAP3_HS_USB_PORTS]; /* one PHY for each port */
78 static inline void ehci_write(void __iomem *base, u32 reg, u32 val)
80 __raw_writel(val, base + reg);
83 static inline u32 ehci_read(void __iomem *base, u32 reg)
85 return __raw_readl(base + reg);
88 static int omap_ehci_init(struct usb_hcd *hcd)
90 struct ehci_hcd *ehci = hcd_to_ehci(hcd);
91 struct omap_hcd *omap = (struct omap_hcd *)ehci->priv;
94 /* Hold PHYs in reset while initializing EHCI controller */
95 for (i = 0; i < omap->nports; i++) {
97 usb_phy_shutdown(omap->phy[i]);
100 /* we know this is the memory we want, no need to ioremap again */
101 ehci->caps = hcd->regs;
103 rc = ehci_setup(hcd);
105 /* Bring PHYs out of reset */
106 for (i = 0; i < omap->nports; i++) {
108 usb_phy_init(omap->phy[i]);
114 /* configure so an HC device and id are always provided */
115 /* always called with process context; sleeping is OK */
117 static struct hc_driver __read_mostly ehci_omap_hc_driver;
119 static const struct ehci_driver_overrides ehci_omap_overrides __initdata = {
120 .reset = omap_ehci_init,
121 .extra_priv_size = sizeof(struct omap_hcd),
125 * ehci_hcd_omap_probe - initialize TI-based HCDs
127 * Allocates basic resources for this USB host controller, and
128 * then invokes the start() method for the HCD associated with it
129 * through the hotplug entry's driver_data.
131 static int ehci_hcd_omap_probe(struct platform_device *pdev)
133 struct device *dev = &pdev->dev;
134 struct usbhs_omap_platform_data *pdata = dev->platform_data;
135 struct resource *res;
141 struct omap_hcd *omap;
147 dev_err(dev, "Missing parent device\n");
151 irq = platform_get_irq_byname(pdev, "ehci-irq");
153 dev_err(dev, "EHCI irq failed\n");
157 res = platform_get_resource_byname(pdev,
158 IORESOURCE_MEM, "ehci");
159 regs = devm_ioremap_resource(dev, res);
161 return PTR_ERR(regs);
163 hcd = usb_create_hcd(&ehci_omap_hc_driver, dev,
166 dev_err(dev, "Failed to create HCD\n");
170 hcd->rsrc_start = res->start;
171 hcd->rsrc_len = resource_size(res);
174 omap = (struct omap_hcd *)hcd_to_ehci(hcd)->priv;
175 omap->nports = pdata->nports;
177 platform_set_drvdata(pdev, hcd);
179 /* get the PHY devices if needed */
180 for (i = 0 ; i < omap->nports ; i++) {
183 if (pdata->port_mode[i] != OMAP_EHCI_PORT_MODE_PHY)
186 /* get the PHY device */
187 phy = devm_usb_get_phy_dev(dev, i);
188 if (IS_ERR(phy) || !phy) {
189 ret = IS_ERR(phy) ? PTR_ERR(phy) : -ENODEV;
190 dev_err(dev, "Can't get PHY device for port %d: %d\n",
196 usb_phy_init(omap->phy[i]);
197 /* bring PHY out of suspend */
198 usb_phy_set_suspend(omap->phy[i], 0);
201 pm_runtime_enable(dev);
202 pm_runtime_get_sync(dev);
205 * An undocumented "feature" in the OMAP3 EHCI controller,
206 * causes suspended ports to be taken out of suspend when
207 * the USBCMD.Run/Stop bit is cleared (for example when
208 * we do ehci_bus_suspend).
209 * This breaks suspend-resume if the root-hub is allowed
210 * to suspend. Writing 1 to this undocumented register bit
211 * disables this feature and restores normal behavior.
213 ehci_write(regs, EHCI_INSNREG04,
214 EHCI_INSNREG04_DISABLE_UNSUSPEND);
216 ret = usb_add_hcd(hcd, irq, IRQF_SHARED);
218 dev_err(dev, "failed to add hcd with err %d\n", ret);
226 pm_runtime_put_sync(dev);
229 for (i = 0; i < omap->nports; i++) {
231 usb_phy_shutdown(omap->phy[i]);
241 * ehci_hcd_omap_remove - shutdown processing for EHCI HCDs
242 * @pdev: USB Host Controller being removed
244 * Reverses the effect of usb_ehci_hcd_omap_probe(), first invoking
245 * the HCD's stop() method. It is always called from a thread
246 * context, normally "rmmod", "apmd", or something similar.
248 static int ehci_hcd_omap_remove(struct platform_device *pdev)
250 struct device *dev = &pdev->dev;
251 struct usb_hcd *hcd = dev_get_drvdata(dev);
252 struct omap_hcd *omap = (struct omap_hcd *)hcd_to_ehci(hcd)->priv;
257 for (i = 0; i < omap->nports; i++) {
259 usb_phy_shutdown(omap->phy[i]);
263 pm_runtime_put_sync(dev);
264 pm_runtime_disable(dev);
269 static void ehci_hcd_omap_shutdown(struct platform_device *pdev)
271 struct usb_hcd *hcd = dev_get_drvdata(&pdev->dev);
273 if (hcd->driver->shutdown)
274 hcd->driver->shutdown(hcd);
277 static struct platform_driver ehci_hcd_omap_driver = {
278 .probe = ehci_hcd_omap_probe,
279 .remove = ehci_hcd_omap_remove,
280 .shutdown = ehci_hcd_omap_shutdown,
281 /*.suspend = ehci_hcd_omap_suspend, */
282 /*.resume = ehci_hcd_omap_resume, */
288 /*-------------------------------------------------------------------------*/
290 static int __init ehci_omap_init(void)
295 pr_info("%s: " DRIVER_DESC "\n", hcd_name);
297 ehci_init_driver(&ehci_omap_hc_driver, &ehci_omap_overrides);
298 return platform_driver_register(&ehci_hcd_omap_driver);
300 module_init(ehci_omap_init);
302 static void __exit ehci_omap_cleanup(void)
304 platform_driver_unregister(&ehci_hcd_omap_driver);
306 module_exit(ehci_omap_cleanup);
308 MODULE_ALIAS("platform:ehci-omap");
309 MODULE_AUTHOR("Texas Instruments, Inc.");
310 MODULE_AUTHOR("Felipe Balbi <felipe.balbi@nokia.com>");
312 MODULE_DESCRIPTION(DRIVER_DESC);
313 MODULE_LICENSE("GPL");