inet: frag: enforce memory limits earlier
[linux/fpc-iii.git] / drivers / usb / host / ehci-omap.c
blob94ea9fff13e6d7328cd956f2b01dbe8c47eaa3c3
1 /*
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
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>
48 #include "ehci.h"
50 #include <linux/platform_data/usb-omap.h>
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
63 #define DRIVER_DESC "OMAP-EHCI Host Controller driver"
65 static const char hcd_name[] = "ehci-omap";
67 /*-------------------------------------------------------------------------*/
69 struct omap_hcd {
70 struct usb_phy *phy[OMAP3_HS_USB_PORTS]; /* one PHY for each port */
71 int nports;
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);
84 /* configure so an HC device and id are always provided */
85 /* always called with process context; sleeping is OK */
87 static struct hc_driver __read_mostly ehci_omap_hc_driver;
89 static const struct ehci_driver_overrides ehci_omap_overrides __initconst = {
90 .extra_priv_size = sizeof(struct omap_hcd),
93 /**
94 * ehci_hcd_omap_probe - initialize TI-based HCDs
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.
100 static int ehci_hcd_omap_probe(struct platform_device *pdev)
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;
112 if (usb_disabled())
113 return -ENODEV;
115 if (!dev->parent) {
116 dev_err(dev, "Missing parent device\n");
117 return -ENODEV;
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;
126 if (!pdata) {
127 dev_err(dev, "Missing platform data\n");
128 return -ENODEV;
131 irq = platform_get_irq(pdev, 0);
132 if (irq < 0) {
133 dev_err(dev, "EHCI irq failed\n");
134 return -ENODEV;
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);
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.
147 ret = dma_coerce_mask_and_coherent(dev, DMA_BIT_MASK(32));
148 if (ret)
149 return ret;
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;
159 hcd->rsrc_start = res->start;
160 hcd->rsrc_len = resource_size(res);
161 hcd->regs = regs;
162 hcd_to_ehci(hcd)->caps = regs;
164 omap = (struct omap_hcd *)hcd_to_ehci(hcd)->priv;
165 omap->nports = pdata->nports;
167 platform_set_drvdata(pdev, hcd);
169 /* get the PHY devices if needed */
170 for (i = 0 ; i < omap->nports ; i++) {
171 struct usb_phy *phy;
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;
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;
189 omap->phy[i] = phy;
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);
198 pm_runtime_enable(dev);
199 pm_runtime_get_sync(dev);
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.
210 ehci_write(regs, EHCI_INSNREG04,
211 EHCI_INSNREG04_DISABLE_UNSUSPEND);
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;
218 device_wakeup_enable(hcd->self.controller);
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.
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;
231 usb_phy_init(omap->phy[i]);
232 /* bring PHY out of suspend */
233 usb_phy_set_suspend(omap->phy[i], 0);
236 return 0;
238 err_pm_runtime:
239 pm_runtime_put_sync(dev);
241 err_phy:
242 for (i = 0; i < omap->nports; i++) {
243 if (omap->phy[i])
244 usb_phy_shutdown(omap->phy[i]);
247 usb_put_hcd(hcd);
249 return ret;
254 * ehci_hcd_omap_remove - shutdown processing for EHCI HCDs
255 * @pdev: USB Host Controller being removed
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.
261 static int ehci_hcd_omap_remove(struct platform_device *pdev)
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;
268 usb_remove_hcd(hcd);
270 for (i = 0; i < omap->nports; i++) {
271 if (omap->phy[i])
272 usb_phy_shutdown(omap->phy[i]);
275 usb_put_hcd(hcd);
276 pm_runtime_put_sync(dev);
277 pm_runtime_disable(dev);
279 return 0;
282 static const struct of_device_id omap_ehci_dt_ids[] = {
283 { .compatible = "ti,ehci-omap" },
287 MODULE_DEVICE_TABLE(of, omap_ehci_dt_ids);
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,
301 /*-------------------------------------------------------------------------*/
303 static int __init ehci_omap_init(void)
305 if (usb_disabled())
306 return -ENODEV;
308 pr_info("%s: " DRIVER_DESC "\n", hcd_name);
310 ehci_init_driver(&ehci_omap_hc_driver, &ehci_omap_overrides);
311 return platform_driver_register(&ehci_hcd_omap_driver);
313 module_init(ehci_omap_init);
315 static void __exit ehci_omap_cleanup(void)
317 platform_driver_unregister(&ehci_hcd_omap_driver);
319 module_exit(ehci_omap_cleanup);
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>");
326 MODULE_DESCRIPTION(DRIVER_DESC);
327 MODULE_LICENSE("GPL");