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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) 2007-2011 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>
11 *
12 * Copyright (C) 2009 Nokia Corporation
13 * Contact: Felipe Balbi <felipe.balbi@nokia.com>
14 *
15 * Based on "ehci-fsl.c" and "ehci-au1xxx.c" ehci glue layers
16 *
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.
21 *
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.
26 *
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
30 *
31 * TODO (last updated Feb 27, 2010):
32 * - add kernel-doc
33 * - enable AUTOIDLE
34 * - add suspend/resume
35 * - add HSIC and TLL support
36 * - convert to use hwmod and runtime PM
37 */
38
39#include <linux/platform_device.h>
40#include <linux/slab.h>
41#include <linux/usb/ulpi.h>
42#include <plat/usb.h>
43#include <linux/regulator/consumer.h>
44
45/* EHCI Register Set */
46#define EHCI_INSNREG04 (0xA0)
47#define EHCI_INSNREG04_DISABLE_UNSUSPEND (1 << 5)
48#define EHCI_INSNREG05_ULPI (0xA4)
49#define EHCI_INSNREG05_ULPI_CONTROL_SHIFT 31
50#define EHCI_INSNREG05_ULPI_PORTSEL_SHIFT 24
51#define EHCI_INSNREG05_ULPI_OPSEL_SHIFT 22
52#define EHCI_INSNREG05_ULPI_REGADD_SHIFT 16
53#define EHCI_INSNREG05_ULPI_EXTREGADD_SHIFT 8
54#define EHCI_INSNREG05_ULPI_WRDATA_SHIFT 0
55
56/*-------------------------------------------------------------------------*/
57
58static const struct hc_driver ehci_omap_hc_driver;
59
60
61static inline void ehci_write(void __iomem *base, u32 reg, u32 val)
62{
63 __raw_writel(val, base + reg);
64}
65
66static inline u32 ehci_read(void __iomem *base, u32 reg)
67{
68 return __raw_readl(base + reg);
69}
70
71static void omap_ehci_soft_phy_reset(struct platform_device *pdev, u8 port)
72{
73 struct usb_hcd *hcd = dev_get_drvdata(&pdev->dev);
74 unsigned long timeout = jiffies + msecs_to_jiffies(1000);
75 unsigned reg = 0;
76
77 reg = ULPI_FUNC_CTRL_RESET
78 /* FUNCTION_CTRL_SET register */
79 | (ULPI_SET(ULPI_FUNC_CTRL) << EHCI_INSNREG05_ULPI_REGADD_SHIFT)
80 /* Write */
81 | (2 << EHCI_INSNREG05_ULPI_OPSEL_SHIFT)
82 /* PORTn */
83 | ((port + 1) << EHCI_INSNREG05_ULPI_PORTSEL_SHIFT)
84 /* start ULPI access*/
85 | (1 << EHCI_INSNREG05_ULPI_CONTROL_SHIFT);
86
87 ehci_write(hcd->regs, EHCI_INSNREG05_ULPI, reg);
88
89 /* Wait for ULPI access completion */
90 while ((ehci_read(hcd->regs, EHCI_INSNREG05_ULPI)
91 & (1 << EHCI_INSNREG05_ULPI_CONTROL_SHIFT))) {
92 cpu_relax();
93
94 if (time_after(jiffies, timeout)) {
95 dev_dbg(&pdev->dev, "phy reset operation timed out\n");
96 break;
97 }
98 }
99}
100
101static void disable_put_regulator(
102 struct ehci_hcd_omap_platform_data *pdata)
103{
104 int i;
105
106 for (i = 0 ; i < OMAP3_HS_USB_PORTS ; i++) {
107 if (pdata->regulator[i]) {
108 regulator_disable(pdata->regulator[i]);
109 regulator_put(pdata->regulator[i]);
110 }
111 }
112}
113
114/* configure so an HC device and id are always provided */
115/* always called with process context; sleeping is OK */
116
117/**
118 * ehci_hcd_omap_probe - initialize TI-based HCDs
119 *
120 * Allocates basic resources for this USB host controller, and
121 * then invokes the start() method for the HCD associated with it
122 * through the hotplug entry's driver_data.
123 */
124static int ehci_hcd_omap_probe(struct platform_device *pdev)
125{
126 struct device *dev = &pdev->dev;
127 struct ehci_hcd_omap_platform_data *pdata = dev->platform_data;
128 struct resource *res;
129 struct usb_hcd *hcd;
130 void __iomem *regs;
131 struct ehci_hcd *omap_ehci;
132 int ret = -ENODEV;
133 int irq;
134 int i;
135 char supply[7];
136
137 if (usb_disabled())
138 return -ENODEV;
139
140 if (!dev->parent) {
141 dev_err(dev, "Missing parent device\n");
142 return -ENODEV;
143 }
144
145 irq = platform_get_irq_byname(pdev, "ehci-irq");
146 if (irq < 0) {
147 dev_err(dev, "EHCI irq failed\n");
148 return -ENODEV;
149 }
150
151 res = platform_get_resource_byname(pdev,
152 IORESOURCE_MEM, "ehci");
153 if (!res) {
154 dev_err(dev, "UHH EHCI get resource failed\n");
155 return -ENODEV;
156 }
157
158 regs = ioremap(res->start, resource_size(res));
159 if (!regs) {
160 dev_err(dev, "UHH EHCI ioremap failed\n");
161 return -ENOMEM;
162 }
163
164 hcd = usb_create_hcd(&ehci_omap_hc_driver, dev,
165 dev_name(dev));
166 if (!hcd) {
167 dev_err(dev, "failed to create hcd with err %d\n", ret);
168 ret = -ENOMEM;
169 goto err_io;
170 }
171
172 hcd->rsrc_start = res->start;
173 hcd->rsrc_len = resource_size(res);
174 hcd->regs = regs;
175
176 /* get ehci regulator and enable */
177 for (i = 0 ; i < OMAP3_HS_USB_PORTS ; i++) {
178 if (pdata->port_mode[i] != OMAP_EHCI_PORT_MODE_PHY) {
179 pdata->regulator[i] = NULL;
180 continue;
181 }
182 snprintf(supply, sizeof(supply), "hsusb%d", i);
183 pdata->regulator[i] = regulator_get(dev, supply);
184 if (IS_ERR(pdata->regulator[i])) {
185 pdata->regulator[i] = NULL;
186 dev_dbg(dev,
187 "failed to get ehci port%d regulator\n", i);
188 } else {
189 regulator_enable(pdata->regulator[i]);
190 }
191 }
192
193 ret = omap_usbhs_enable(dev);
194 if (ret) {
195 dev_err(dev, "failed to start usbhs with err %d\n", ret);
196 goto err_enable;
197 }
198
199 /*
200 * An undocumented "feature" in the OMAP3 EHCI controller,
201 * causes suspended ports to be taken out of suspend when
202 * the USBCMD.Run/Stop bit is cleared (for example when
203 * we do ehci_bus_suspend).
204 * This breaks suspend-resume if the root-hub is allowed
205 * to suspend. Writing 1 to this undocumented register bit
206 * disables this feature and restores normal behavior.
207 */
208 ehci_write(regs, EHCI_INSNREG04,
209 EHCI_INSNREG04_DISABLE_UNSUSPEND);
210
211 /* Soft reset the PHY using PHY reset command over ULPI */
212 if (pdata->port_mode[0] == OMAP_EHCI_PORT_MODE_PHY)
213 omap_ehci_soft_phy_reset(pdev, 0);
214 if (pdata->port_mode[1] == OMAP_EHCI_PORT_MODE_PHY)
215 omap_ehci_soft_phy_reset(pdev, 1);
216
217 omap_ehci = hcd_to_ehci(hcd);
218 omap_ehci->sbrn = 0x20;
219
220 /* we know this is the memory we want, no need to ioremap again */
221 omap_ehci->caps = hcd->regs;
222 omap_ehci->regs = hcd->regs
223 + HC_LENGTH(ehci, readl(&omap_ehci->caps->hc_capbase));
224
225 dbg_hcs_params(omap_ehci, "reset");
226 dbg_hcc_params(omap_ehci, "reset");
227
228 /* cache this readonly data; minimize chip reads */
229 omap_ehci->hcs_params = readl(&omap_ehci->caps->hcs_params);
230
231 ret = usb_add_hcd(hcd, irq, IRQF_DISABLED | IRQF_SHARED);
232 if (ret) {
233 dev_err(dev, "failed to add hcd with err %d\n", ret);
234 goto err_add_hcd;
235 }
236
237 /* root ports should always stay powered */
238 ehci_port_power(omap_ehci, 1);
239
240 return 0;
241
242err_add_hcd:
243 omap_usbhs_disable(dev);
244
245err_enable:
246 disable_put_regulator(pdata);
247 usb_put_hcd(hcd);
248
249err_io:
250 iounmap(regs);
251 return ret;
252}
253
254
255/**
256 * ehci_hcd_omap_remove - shutdown processing for EHCI HCDs
257 * @pdev: USB Host Controller being removed
258 *
259 * Reverses the effect of usb_ehci_hcd_omap_probe(), first invoking
260 * the HCD's stop() method. It is always called from a thread
261 * context, normally "rmmod", "apmd", or something similar.
262 */
263static int ehci_hcd_omap_remove(struct platform_device *pdev)
264{
265 struct device *dev = &pdev->dev;
266 struct usb_hcd *hcd = dev_get_drvdata(dev);
267
268 usb_remove_hcd(hcd);
269 omap_usbhs_disable(dev);
270 disable_put_regulator(dev->platform_data);
271 iounmap(hcd->regs);
272 usb_put_hcd(hcd);
273 return 0;
274}
275
276static void ehci_hcd_omap_shutdown(struct platform_device *pdev)
277{
278 struct usb_hcd *hcd = dev_get_drvdata(&pdev->dev);
279
280 if (hcd->driver->shutdown)
281 hcd->driver->shutdown(hcd);
282}
283
284static struct platform_driver ehci_hcd_omap_driver = {
285 .probe = ehci_hcd_omap_probe,
286 .remove = ehci_hcd_omap_remove,
287 .shutdown = ehci_hcd_omap_shutdown,
288 /*.suspend = ehci_hcd_omap_suspend, */
289 /*.resume = ehci_hcd_omap_resume, */
290 .driver = {
291 .name = "ehci-omap",
292 }
293};
294
295/*-------------------------------------------------------------------------*/
296
297static const struct hc_driver ehci_omap_hc_driver = {
298 .description = hcd_name,
299 .product_desc = "OMAP-EHCI Host Controller",
300 .hcd_priv_size = sizeof(struct ehci_hcd),
301
302 /*
303 * generic hardware linkage
304 */
305 .irq = ehci_irq,
306 .flags = HCD_MEMORY | HCD_USB2,
307
308 /*
309 * basic lifecycle operations
310 */
311 .reset = ehci_init,
312 .start = ehci_run,
313 .stop = ehci_stop,
314 .shutdown = ehci_shutdown,
315
316 /*
317 * managing i/o requests and associated device resources
318 */
319 .urb_enqueue = ehci_urb_enqueue,
320 .urb_dequeue = ehci_urb_dequeue,
321 .endpoint_disable = ehci_endpoint_disable,
322 .endpoint_reset = ehci_endpoint_reset,
323
324 /*
325 * scheduling support
326 */
327 .get_frame_number = ehci_get_frame,
328
329 /*
330 * root hub support
331 */
332 .hub_status_data = ehci_hub_status_data,
333 .hub_control = ehci_hub_control,
334 .bus_suspend = ehci_bus_suspend,
335 .bus_resume = ehci_bus_resume,
336
337 .clear_tt_buffer_complete = ehci_clear_tt_buffer_complete,
338};
339
340MODULE_ALIAS("platform:omap-ehci");
341MODULE_AUTHOR("Texas Instruments, Inc.");
342MODULE_AUTHOR("Felipe Balbi <felipe.balbi@nokia.com>");
343
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
65static const char hcd_name[] = "ehci-omap";
66
67/*-------------------------------------------------------------------------*/
68
69struct omap_hcd {
70 struct usb_phy *phy[OMAP3_HS_USB_PORTS]; /* one PHY for each port */
71 int nports;
72};
73
74static inline void ehci_write(void __iomem *base, u32 reg, u32 val)
75{
76 __raw_writel(val, base + reg);
77}
78
79static 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
87static struct hc_driver __read_mostly ehci_omap_hc_driver;
88
89static 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 */
100static 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
238err_pm_runtime:
239 pm_runtime_put_sync(dev);
240
241err_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 */
261static 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
282static const struct of_device_id omap_ehci_dt_ids[] = {
283 { .compatible = "ti,ehci-omap" },
284 { }
285};
286
287MODULE_DEVICE_TABLE(of, omap_ehci_dt_ids);
288
289static 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
303static 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}
313module_init(ehci_omap_init);
314
315static void __exit ehci_omap_cleanup(void)
316{
317 platform_driver_unregister(&ehci_hcd_omap_driver);
318}
319module_exit(ehci_omap_cleanup);
320
321MODULE_ALIAS("platform:ehci-omap");
322MODULE_AUTHOR("Texas Instruments, Inc.");
323MODULE_AUTHOR("Felipe Balbi <felipe.balbi@nokia.com>");
324MODULE_AUTHOR("Roger Quadros <rogerq@ti.com>");
325
326MODULE_DESCRIPTION(DRIVER_DESC);
327MODULE_LICENSE("GPL");