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Linux/drivers/usb/host/ehci-omap.c

  1 /*
  2  * ehci-omap.c - driver for USBHOST on OMAP3/4 processors
  3  *
  4  * Bus Glue for the EHCI controllers in OMAP3/4
  5  * Tested on several OMAP3 boards, and OMAP4 Pandaboard
  6  *
  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>
 12  *
 13  * Copyright (C) 2009 Nokia Corporation
 14  *      Contact: Felipe Balbi <felipe.balbi@nokia.com>
 15  *
 16  * Based on "ehci-fsl.c" and "ehci-au1xxx.c" ehci glue layers
 17  *
 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.
 22  *
 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.
 27  *
 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
 31  *
 32  */
 33 
 34 #include <linux/kernel.h>
 35 #include <linux/module.h>
 36 #include <linux/io.h>
 37 #include <linux/platform_device.h>
 38 #include <linux/slab.h>
 39 #include <linux/usb/ulpi.h>
 40 #include <linux/pm_runtime.h>
 41 #include <linux/gpio.h>
 42 #include <linux/clk.h>
 43 #include <linux/usb.h>
 44 #include <linux/usb/hcd.h>
 45 #include <linux/of.h>
 46 #include <linux/dma-mapping.h>
 47 
 48 #include "ehci.h"
 49 
 50 #include <linux/platform_data/usb-omap.h>
 51 
 52 /* EHCI Register Set */
 53 #define EHCI_INSNREG04                                  (0xA0)
 54 #define EHCI_INSNREG04_DISABLE_UNSUSPEND                (1 << 5)
 55 #define EHCI_INSNREG05_ULPI                             (0xA4)
 56 #define EHCI_INSNREG05_ULPI_CONTROL_SHIFT               31
 57 #define EHCI_INSNREG05_ULPI_PORTSEL_SHIFT               24
 58 #define EHCI_INSNREG05_ULPI_OPSEL_SHIFT                 22
 59 #define EHCI_INSNREG05_ULPI_REGADD_SHIFT                16
 60 #define EHCI_INSNREG05_ULPI_EXTREGADD_SHIFT             8
 61 #define EHCI_INSNREG05_ULPI_WRDATA_SHIFT                0
 62 
 63 #define DRIVER_DESC "OMAP-EHCI Host Controller driver"
 64 
 65 static const char hcd_name[] = "ehci-omap";
 66 
 67 /*-------------------------------------------------------------------------*/
 68 
 69 struct omap_hcd {
 70         struct usb_phy *phy[OMAP3_HS_USB_PORTS]; /* one PHY for each port */
 71         int nports;
 72 };
 73 
 74 static inline void ehci_write(void __iomem *base, u32 reg, u32 val)
 75 {
 76         __raw_writel(val, base + reg);
 77 }
 78 
 79 static inline u32 ehci_read(void __iomem *base, u32 reg)
 80 {
 81         return __raw_readl(base + reg);
 82 }
 83 
 84 /* configure so an HC device and id are always provided */
 85 /* always called with process context; sleeping is OK */
 86 
 87 static struct hc_driver __read_mostly ehci_omap_hc_driver;
 88 
 89 static const struct ehci_driver_overrides ehci_omap_overrides __initdata = {
 90         .extra_priv_size = sizeof(struct omap_hcd),
 91 };
 92 
 93 /**
 94  * ehci_hcd_omap_probe - initialize TI-based HCDs
 95  *
 96  * Allocates basic resources for this USB host controller, and
 97  * then invokes the start() method for the HCD associated with it
 98  * through the hotplug entry's driver_data.
 99  */
100 static int ehci_hcd_omap_probe(struct platform_device *pdev)
101 {
102         struct device *dev = &pdev->dev;
103         struct usbhs_omap_platform_data *pdata = dev_get_platdata(dev);
104         struct resource *res;
105         struct usb_hcd  *hcd;
106         void __iomem *regs;
107         int ret;
108         int irq;
109         int i;
110         struct omap_hcd *omap;
111 
112         if (usb_disabled())
113                 return -ENODEV;
114 
115         if (!dev->parent) {
116                 dev_err(dev, "Missing parent device\n");
117                 return -ENODEV;
118         }
119 
120         /* For DT boot, get platform data from parent. i.e. usbhshost */
121         if (dev->of_node) {
122                 pdata = dev_get_platdata(dev->parent);
123                 dev->platform_data = pdata;
124         }
125 
126         if (!pdata) {
127                 dev_err(dev, "Missing platform data\n");
128                 return -ENODEV;
129         }
130 
131         irq = platform_get_irq(pdev, 0);
132         if (irq < 0) {
133                 dev_err(dev, "EHCI irq failed\n");
134                 return -ENODEV;
135         }
136 
137         res =  platform_get_resource(pdev, IORESOURCE_MEM, 0);
138         regs = devm_ioremap_resource(dev, res);
139         if (IS_ERR(regs))
140                 return PTR_ERR(regs);
141 
142         /*
143          * Right now device-tree probed devices don't get dma_mask set.
144          * Since shared usb code relies on it, set it here for now.
145          * Once we have dma capability bindings this can go away.
146          */
147         ret = dma_coerce_mask_and_coherent(dev, DMA_BIT_MASK(32));
148         if (ret)
149                 return ret;
150 
151         ret = -ENODEV;
152         hcd = usb_create_hcd(&ehci_omap_hc_driver, dev,
153                         dev_name(dev));
154         if (!hcd) {
155                 dev_err(dev, "Failed to create HCD\n");
156                 return -ENOMEM;
157         }
158 
159         hcd->rsrc_start = res->start;
160         hcd->rsrc_len = resource_size(res);
161         hcd->regs = regs;
162         hcd_to_ehci(hcd)->caps = regs;
163 
164         omap = (struct omap_hcd *)hcd_to_ehci(hcd)->priv;
165         omap->nports = pdata->nports;
166 
167         platform_set_drvdata(pdev, hcd);
168 
169         /* get the PHY devices if needed */
170         for (i = 0 ; i < omap->nports ; i++) {
171                 struct usb_phy *phy;
172 
173                 /* get the PHY device */
174                 if (dev->of_node)
175                         phy = devm_usb_get_phy_by_phandle(dev, "phys", i);
176                 else
177                         phy = devm_usb_get_phy_dev(dev, i);
178                 if (IS_ERR(phy)) {
179                         /* Don't bail out if PHY is not absolutely necessary */
180                         if (pdata->port_mode[i] != OMAP_EHCI_PORT_MODE_PHY)
181                                 continue;
182 
183                         ret = PTR_ERR(phy);
184                         dev_err(dev, "Can't get PHY device for port %d: %d\n",
185                                         i, ret);
186                         goto err_phy;
187                 }
188 
189                 omap->phy[i] = phy;
190 
191                 if (pdata->port_mode[i] == OMAP_EHCI_PORT_MODE_PHY) {
192                         usb_phy_init(omap->phy[i]);
193                         /* bring PHY out of suspend */
194                         usb_phy_set_suspend(omap->phy[i], 0);
195                 }
196         }
197 
198         pm_runtime_enable(dev);
199         pm_runtime_get_sync(dev);
200 
201         /*
202          * An undocumented "feature" in the OMAP3 EHCI controller,
203          * causes suspended ports to be taken out of suspend when
204          * the USBCMD.Run/Stop bit is cleared (for example when
205          * we do ehci_bus_suspend).
206          * This breaks suspend-resume if the root-hub is allowed
207          * to suspend. Writing 1 to this undocumented register bit
208          * disables this feature and restores normal behavior.
209          */
210         ehci_write(regs, EHCI_INSNREG04,
211                                 EHCI_INSNREG04_DISABLE_UNSUSPEND);
212 
213         ret = usb_add_hcd(hcd, irq, IRQF_SHARED);
214         if (ret) {
215                 dev_err(dev, "failed to add hcd with err %d\n", ret);
216                 goto err_pm_runtime;
217         }
218         device_wakeup_enable(hcd->self.controller);
219 
220         /*
221          * Bring PHYs out of reset for non PHY modes.
222          * Even though HSIC mode is a PHY-less mode, the reset
223          * line exists between the chips and can be modelled
224          * as a PHY device for reset control.
225          */
226         for (i = 0; i < omap->nports; i++) {
227                 if (!omap->phy[i] ||
228                      pdata->port_mode[i] == OMAP_EHCI_PORT_MODE_PHY)
229                         continue;
230 
231                 usb_phy_init(omap->phy[i]);
232                 /* bring PHY out of suspend */
233                 usb_phy_set_suspend(omap->phy[i], 0);
234         }
235 
236         return 0;
237 
238 err_pm_runtime:
239         pm_runtime_put_sync(dev);
240 
241 err_phy:
242         for (i = 0; i < omap->nports; i++) {
243                 if (omap->phy[i])
244                         usb_phy_shutdown(omap->phy[i]);
245         }
246 
247         usb_put_hcd(hcd);
248 
249         return ret;
250 }
251 
252 
253 /**
254  * ehci_hcd_omap_remove - shutdown processing for EHCI HCDs
255  * @pdev: USB Host Controller being removed
256  *
257  * Reverses the effect of usb_ehci_hcd_omap_probe(), first invoking
258  * the HCD's stop() method.  It is always called from a thread
259  * context, normally "rmmod", "apmd", or something similar.
260  */
261 static int ehci_hcd_omap_remove(struct platform_device *pdev)
262 {
263         struct device *dev = &pdev->dev;
264         struct usb_hcd *hcd = dev_get_drvdata(dev);
265         struct omap_hcd *omap = (struct omap_hcd *)hcd_to_ehci(hcd)->priv;
266         int i;
267 
268         usb_remove_hcd(hcd);
269 
270         for (i = 0; i < omap->nports; i++) {
271                 if (omap->phy[i])
272                         usb_phy_shutdown(omap->phy[i]);
273         }
274 
275         usb_put_hcd(hcd);
276         pm_runtime_put_sync(dev);
277         pm_runtime_disable(dev);
278 
279         return 0;
280 }
281 
282 static const struct of_device_id omap_ehci_dt_ids[] = {
283         { .compatible = "ti,ehci-omap" },
284         { }
285 };
286 
287 MODULE_DEVICE_TABLE(of, omap_ehci_dt_ids);
288 
289 static struct platform_driver ehci_hcd_omap_driver = {
290         .probe                  = ehci_hcd_omap_probe,
291         .remove                 = ehci_hcd_omap_remove,
292         .shutdown               = usb_hcd_platform_shutdown,
293         /*.suspend              = ehci_hcd_omap_suspend, */
294         /*.resume               = ehci_hcd_omap_resume, */
295         .driver = {
296                 .name           = hcd_name,
297                 .of_match_table = omap_ehci_dt_ids,
298         }
299 };
300 
301 /*-------------------------------------------------------------------------*/
302 
303 static int __init ehci_omap_init(void)
304 {
305         if (usb_disabled())
306                 return -ENODEV;
307 
308         pr_info("%s: " DRIVER_DESC "\n", hcd_name);
309 
310         ehci_init_driver(&ehci_omap_hc_driver, &ehci_omap_overrides);
311         return platform_driver_register(&ehci_hcd_omap_driver);
312 }
313 module_init(ehci_omap_init);
314 
315 static void __exit ehci_omap_cleanup(void)
316 {
317         platform_driver_unregister(&ehci_hcd_omap_driver);
318 }
319 module_exit(ehci_omap_cleanup);
320 
321 MODULE_ALIAS("platform:ehci-omap");
322 MODULE_AUTHOR("Texas Instruments, Inc.");
323 MODULE_AUTHOR("Felipe Balbi <felipe.balbi@nokia.com>");
324 MODULE_AUTHOR("Roger Quadros <rogerq@ti.com>");
325 
326 MODULE_DESCRIPTION(DRIVER_DESC);
327 MODULE_LICENSE("GPL");
328 

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