USB: ehci-omap: Remove PHY regulator handling code
[profile/ivi/kernel-x86-ivi.git] / 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  * TODO (last updated Feb 27, 2010):
33  *      - add kernel-doc
34  *      - enable AUTOIDLE
35  *      - add suspend/resume
36  *      - add HSIC and TLL support
37  *      - convert to use hwmod and runtime PM
38  */
39
40 #include <linux/kernel.h>
41 #include <linux/module.h>
42 #include <linux/io.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>
51
52 #include "ehci.h"
53
54 #include <linux/platform_data/usb-omap.h>
55
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
66
67 #define DRIVER_DESC "OMAP-EHCI Host Controller driver"
68
69 static const char hcd_name[] = "ehci-omap";
70
71 /*-------------------------------------------------------------------------*/
72
73 struct omap_hcd {
74         struct usb_phy *phy[OMAP3_HS_USB_PORTS]; /* one PHY for each port */
75         int nports;
76 };
77
78 static inline void ehci_write(void __iomem *base, u32 reg, u32 val)
79 {
80         __raw_writel(val, base + reg);
81 }
82
83 static inline u32 ehci_read(void __iomem *base, u32 reg)
84 {
85         return __raw_readl(base + reg);
86 }
87
88 static int omap_ehci_init(struct usb_hcd *hcd)
89 {
90         struct ehci_hcd *ehci = hcd_to_ehci(hcd);
91         struct omap_hcd *omap = (struct omap_hcd *)ehci->priv;
92         int rc, i;
93
94         /* Hold PHYs in reset while initializing EHCI controller */
95         for (i = 0; i < omap->nports; i++) {
96                 if (omap->phy[i])
97                         usb_phy_shutdown(omap->phy[i]);
98         }
99
100         /* we know this is the memory we want, no need to ioremap again */
101         ehci->caps = hcd->regs;
102
103         rc = ehci_setup(hcd);
104
105         /* Bring PHYs out of reset */
106         for (i = 0; i < omap->nports; i++) {
107                 if (omap->phy[i])
108                         usb_phy_init(omap->phy[i]);
109         }
110
111         return rc;
112 }
113
114 /* configure so an HC device and id are always provided */
115 /* always called with process context; sleeping is OK */
116
117 static struct hc_driver __read_mostly ehci_omap_hc_driver;
118
119 static const struct ehci_driver_overrides ehci_omap_overrides __initdata = {
120         .reset = omap_ehci_init,
121         .extra_priv_size = sizeof(struct omap_hcd),
122 };
123
124 /**
125  * ehci_hcd_omap_probe - initialize TI-based HCDs
126  *
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.
130  */
131 static int ehci_hcd_omap_probe(struct platform_device *pdev)
132 {
133         struct device *dev = &pdev->dev;
134         struct usbhs_omap_platform_data *pdata = dev->platform_data;
135         struct resource *res;
136         struct usb_hcd  *hcd;
137         void __iomem *regs;
138         int ret = -ENODEV;
139         int irq;
140         int i;
141         struct omap_hcd *omap;
142
143         if (usb_disabled())
144                 return -ENODEV;
145
146         if (!dev->parent) {
147                 dev_err(dev, "Missing parent device\n");
148                 return -ENODEV;
149         }
150
151         irq = platform_get_irq_byname(pdev, "ehci-irq");
152         if (irq < 0) {
153                 dev_err(dev, "EHCI irq failed\n");
154                 return -ENODEV;
155         }
156
157         res =  platform_get_resource_byname(pdev,
158                                 IORESOURCE_MEM, "ehci");
159         regs = devm_ioremap_resource(dev, res);
160         if (IS_ERR(regs))
161                 return PTR_ERR(regs);
162
163         hcd = usb_create_hcd(&ehci_omap_hc_driver, dev,
164                         dev_name(dev));
165         if (!hcd) {
166                 dev_err(dev, "Failed to create HCD\n");
167                 return -ENOMEM;
168         }
169
170         hcd->rsrc_start = res->start;
171         hcd->rsrc_len = resource_size(res);
172         hcd->regs = regs;
173
174         omap = (struct omap_hcd *)hcd_to_ehci(hcd)->priv;
175         omap->nports = pdata->nports;
176
177         platform_set_drvdata(pdev, hcd);
178
179         /* get the PHY devices if needed */
180         for (i = 0 ; i < omap->nports ; i++) {
181                 struct usb_phy *phy;
182
183                 if (pdata->port_mode[i] != OMAP_EHCI_PORT_MODE_PHY)
184                         continue;
185
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",
191                                         i, ret);
192                         goto err_phy;
193                 }
194
195                 omap->phy[i] = phy;
196                 usb_phy_init(omap->phy[i]);
197                 /* bring PHY out of suspend */
198                 usb_phy_set_suspend(omap->phy[i], 0);
199         }
200
201         pm_runtime_enable(dev);
202         pm_runtime_get_sync(dev);
203
204         /*
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.
212          */
213         ehci_write(regs, EHCI_INSNREG04,
214                                 EHCI_INSNREG04_DISABLE_UNSUSPEND);
215
216         ret = usb_add_hcd(hcd, irq, IRQF_SHARED);
217         if (ret) {
218                 dev_err(dev, "failed to add hcd with err %d\n", ret);
219                 goto err_pm_runtime;
220         }
221
222
223         return 0;
224
225 err_pm_runtime:
226         pm_runtime_put_sync(dev);
227
228 err_phy:
229         for (i = 0; i < omap->nports; i++) {
230                 if (omap->phy[i])
231                         usb_phy_shutdown(omap->phy[i]);
232         }
233
234         usb_put_hcd(hcd);
235
236         return ret;
237 }
238
239
240 /**
241  * ehci_hcd_omap_remove - shutdown processing for EHCI HCDs
242  * @pdev: USB Host Controller being removed
243  *
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.
247  */
248 static int ehci_hcd_omap_remove(struct platform_device *pdev)
249 {
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;
253         int i;
254
255         usb_remove_hcd(hcd);
256
257         for (i = 0; i < omap->nports; i++) {
258                 if (omap->phy[i])
259                         usb_phy_shutdown(omap->phy[i]);
260         }
261
262         usb_put_hcd(hcd);
263         pm_runtime_put_sync(dev);
264         pm_runtime_disable(dev);
265
266         return 0;
267 }
268
269 static void ehci_hcd_omap_shutdown(struct platform_device *pdev)
270 {
271         struct usb_hcd *hcd = dev_get_drvdata(&pdev->dev);
272
273         if (hcd->driver->shutdown)
274                 hcd->driver->shutdown(hcd);
275 }
276
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, */
283         .driver = {
284                 .name           = hcd_name,
285         }
286 };
287
288 /*-------------------------------------------------------------------------*/
289
290 static int __init ehci_omap_init(void)
291 {
292         if (usb_disabled())
293                 return -ENODEV;
294
295         pr_info("%s: " DRIVER_DESC "\n", hcd_name);
296
297         ehci_init_driver(&ehci_omap_hc_driver, &ehci_omap_overrides);
298         return platform_driver_register(&ehci_hcd_omap_driver);
299 }
300 module_init(ehci_omap_init);
301
302 static void __exit ehci_omap_cleanup(void)
303 {
304         platform_driver_unregister(&ehci_hcd_omap_driver);
305 }
306 module_exit(ehci_omap_cleanup);
307
308 MODULE_ALIAS("platform:ehci-omap");
309 MODULE_AUTHOR("Texas Instruments, Inc.");
310 MODULE_AUTHOR("Felipe Balbi <felipe.balbi@nokia.com>");
311
312 MODULE_DESCRIPTION(DRIVER_DESC);
313 MODULE_LICENSE("GPL");