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1// SPDX-License-Identifier: GPL-2.0+
2/*
3 * ehci-omap.c - driver for USBHOST on OMAP3/4 processors
4 *
5 * Bus Glue for the EHCI controllers in OMAP3/4
6 * Tested on several OMAP3 boards, and OMAP4 Pandaboard
7 *
8 * Copyright (C) 2007-2013 Texas Instruments, Inc.
9 * Author: Vikram Pandita <vikram.pandita@ti.com>
10 * Author: Anand Gadiyar <gadiyar@ti.com>
11 * Author: Keshava Munegowda <keshava_mgowda@ti.com>
12 * Author: Roger Quadros <rogerq@ti.com>
13 *
14 * Copyright (C) 2009 Nokia Corporation
15 * Contact: Felipe Balbi <felipe.balbi@nokia.com>
16 *
17 * Based on "ehci-fsl.c" and "ehci-au1xxx.c" ehci glue layers
18 */
19
20#include <linux/kernel.h>
21#include <linux/module.h>
22#include <linux/io.h>
23#include <linux/platform_device.h>
24#include <linux/slab.h>
25#include <linux/usb/ulpi.h>
26#include <linux/pm_runtime.h>
27#include <linux/clk.h>
28#include <linux/usb.h>
29#include <linux/usb/hcd.h>
30#include <linux/of.h>
31#include <linux/dma-mapping.h>
32
33#include "ehci.h"
34
35#include <linux/platform_data/usb-omap.h>
36
37/* EHCI Register Set */
38#define EHCI_INSNREG04 (0xA0)
39#define EHCI_INSNREG04_DISABLE_UNSUSPEND (1 << 5)
40#define EHCI_INSNREG05_ULPI (0xA4)
41#define EHCI_INSNREG05_ULPI_CONTROL_SHIFT 31
42#define EHCI_INSNREG05_ULPI_PORTSEL_SHIFT 24
43#define EHCI_INSNREG05_ULPI_OPSEL_SHIFT 22
44#define EHCI_INSNREG05_ULPI_REGADD_SHIFT 16
45#define EHCI_INSNREG05_ULPI_EXTREGADD_SHIFT 8
46#define EHCI_INSNREG05_ULPI_WRDATA_SHIFT 0
47
48#define DRIVER_DESC "OMAP-EHCI Host Controller driver"
49
50static const char hcd_name[] = "ehci-omap";
51
52/*-------------------------------------------------------------------------*/
53
54struct omap_hcd {
55 struct usb_phy *phy[OMAP3_HS_USB_PORTS]; /* one PHY for each port */
56 int nports;
57};
58
59static inline void ehci_write(void __iomem *base, u32 reg, u32 val)
60{
61 __raw_writel(val, base + reg);
62}
63
64/* configure so an HC device and id are always provided */
65/* always called with process context; sleeping is OK */
66
67static struct hc_driver __read_mostly ehci_omap_hc_driver;
68
69static const struct ehci_driver_overrides ehci_omap_overrides __initconst = {
70 .extra_priv_size = sizeof(struct omap_hcd),
71};
72
73/**
74 * ehci_hcd_omap_probe - initialize TI-based HCDs
75 * @pdev: Pointer to this platform device's information
76 *
77 * Allocates basic resources for this USB host controller, and
78 * then invokes the start() method for the HCD associated with it
79 * through the hotplug entry's driver_data.
80 */
81static int ehci_hcd_omap_probe(struct platform_device *pdev)
82{
83 struct device *dev = &pdev->dev;
84 struct usbhs_omap_platform_data *pdata = dev_get_platdata(dev);
85 struct resource *res;
86 struct usb_hcd *hcd;
87 void __iomem *regs;
88 int ret;
89 int irq;
90 int i;
91 struct omap_hcd *omap;
92
93 if (usb_disabled())
94 return -ENODEV;
95
96 if (!dev->parent) {
97 dev_err(dev, "Missing parent device\n");
98 return -ENODEV;
99 }
100
101 /* For DT boot, get platform data from parent. i.e. usbhshost */
102 if (dev->of_node) {
103 pdata = dev_get_platdata(dev->parent);
104 dev->platform_data = pdata;
105 }
106
107 if (!pdata) {
108 dev_err(dev, "Missing platform data\n");
109 return -ENODEV;
110 }
111
112 irq = platform_get_irq(pdev, 0);
113 if (irq < 0)
114 return irq;
115
116 regs = devm_platform_get_and_ioremap_resource(pdev, 0, &res);
117 if (IS_ERR(regs))
118 return PTR_ERR(regs);
119
120 /*
121 * Right now device-tree probed devices don't get dma_mask set.
122 * Since shared usb code relies on it, set it here for now.
123 * Once we have dma capability bindings this can go away.
124 */
125 ret = dma_coerce_mask_and_coherent(dev, DMA_BIT_MASK(32));
126 if (ret)
127 return ret;
128
129 ret = -ENODEV;
130 hcd = usb_create_hcd(&ehci_omap_hc_driver, dev,
131 dev_name(dev));
132 if (!hcd) {
133 dev_err(dev, "Failed to create HCD\n");
134 return -ENOMEM;
135 }
136
137 hcd->rsrc_start = res->start;
138 hcd->rsrc_len = resource_size(res);
139 hcd->regs = regs;
140 hcd_to_ehci(hcd)->caps = regs;
141
142 omap = (struct omap_hcd *)hcd_to_ehci(hcd)->priv;
143 omap->nports = pdata->nports;
144
145 platform_set_drvdata(pdev, hcd);
146
147 /* get the PHY devices if needed */
148 for (i = 0 ; i < omap->nports ; i++) {
149 struct usb_phy *phy;
150
151 /* get the PHY device */
152 phy = devm_usb_get_phy_by_phandle(dev, "phys", i);
153 if (IS_ERR(phy)) {
154 ret = PTR_ERR(phy);
155 if (ret == -ENODEV) { /* no PHY */
156 phy = NULL;
157 continue;
158 }
159
160 if (ret != -EPROBE_DEFER)
161 dev_err(dev, "Can't get PHY for port %d: %d\n",
162 i, ret);
163 goto err_phy;
164 }
165
166 omap->phy[i] = phy;
167
168 if (pdata->port_mode[i] == OMAP_EHCI_PORT_MODE_PHY) {
169 usb_phy_init(omap->phy[i]);
170 /* bring PHY out of suspend */
171 usb_phy_set_suspend(omap->phy[i], 0);
172 }
173 }
174
175 pm_runtime_enable(dev);
176 pm_runtime_get_sync(dev);
177
178 /*
179 * An undocumented "feature" in the OMAP3 EHCI controller,
180 * causes suspended ports to be taken out of suspend when
181 * the USBCMD.Run/Stop bit is cleared (for example when
182 * we do ehci_bus_suspend).
183 * This breaks suspend-resume if the root-hub is allowed
184 * to suspend. Writing 1 to this undocumented register bit
185 * disables this feature and restores normal behavior.
186 */
187 ehci_write(regs, EHCI_INSNREG04,
188 EHCI_INSNREG04_DISABLE_UNSUSPEND);
189
190 ret = usb_add_hcd(hcd, irq, IRQF_SHARED);
191 if (ret) {
192 dev_err(dev, "failed to add hcd with err %d\n", ret);
193 goto err_pm_runtime;
194 }
195 device_wakeup_enable(hcd->self.controller);
196
197 /*
198 * Bring PHYs out of reset for non PHY modes.
199 * Even though HSIC mode is a PHY-less mode, the reset
200 * line exists between the chips and can be modelled
201 * as a PHY device for reset control.
202 */
203 for (i = 0; i < omap->nports; i++) {
204 if (!omap->phy[i] ||
205 pdata->port_mode[i] == OMAP_EHCI_PORT_MODE_PHY)
206 continue;
207
208 usb_phy_init(omap->phy[i]);
209 /* bring PHY out of suspend */
210 usb_phy_set_suspend(omap->phy[i], 0);
211 }
212
213 return 0;
214
215err_pm_runtime:
216 pm_runtime_put_sync(dev);
217 pm_runtime_disable(dev);
218
219err_phy:
220 for (i = 0; i < omap->nports; i++) {
221 if (omap->phy[i])
222 usb_phy_shutdown(omap->phy[i]);
223 }
224
225 usb_put_hcd(hcd);
226
227 return ret;
228}
229
230
231/**
232 * ehci_hcd_omap_remove - shutdown processing for EHCI HCDs
233 * @pdev: USB Host Controller being removed
234 *
235 * Reverses the effect of usb_ehci_hcd_omap_probe(), first invoking
236 * the HCD's stop() method. It is always called from a thread
237 * context, normally "rmmod", "apmd", or something similar.
238 */
239static void ehci_hcd_omap_remove(struct platform_device *pdev)
240{
241 struct device *dev = &pdev->dev;
242 struct usb_hcd *hcd = dev_get_drvdata(dev);
243 struct omap_hcd *omap = (struct omap_hcd *)hcd_to_ehci(hcd)->priv;
244 int i;
245
246 usb_remove_hcd(hcd);
247
248 for (i = 0; i < omap->nports; i++) {
249 if (omap->phy[i])
250 usb_phy_shutdown(omap->phy[i]);
251 }
252
253 usb_put_hcd(hcd);
254 pm_runtime_put_sync(dev);
255 pm_runtime_disable(dev);
256}
257
258static const struct of_device_id omap_ehci_dt_ids[] = {
259 { .compatible = "ti,ehci-omap" },
260 { }
261};
262
263MODULE_DEVICE_TABLE(of, omap_ehci_dt_ids);
264
265static struct platform_driver ehci_hcd_omap_driver = {
266 .probe = ehci_hcd_omap_probe,
267 .remove_new = ehci_hcd_omap_remove,
268 .shutdown = usb_hcd_platform_shutdown,
269 /*.suspend = ehci_hcd_omap_suspend, */
270 /*.resume = ehci_hcd_omap_resume, */
271 .driver = {
272 .name = hcd_name,
273 .of_match_table = omap_ehci_dt_ids,
274 }
275};
276
277/*-------------------------------------------------------------------------*/
278
279static int __init ehci_omap_init(void)
280{
281 if (usb_disabled())
282 return -ENODEV;
283
284 ehci_init_driver(&ehci_omap_hc_driver, &ehci_omap_overrides);
285 return platform_driver_register(&ehci_hcd_omap_driver);
286}
287module_init(ehci_omap_init);
288
289static void __exit ehci_omap_cleanup(void)
290{
291 platform_driver_unregister(&ehci_hcd_omap_driver);
292}
293module_exit(ehci_omap_cleanup);
294
295MODULE_ALIAS("platform:ehci-omap");
296MODULE_AUTHOR("Texas Instruments, Inc.");
297MODULE_AUTHOR("Felipe Balbi <felipe.balbi@nokia.com>");
298MODULE_AUTHOR("Roger Quadros <rogerq@ti.com>");
299
300MODULE_DESCRIPTION(DRIVER_DESC);
301MODULE_LICENSE("GPL");
1// SPDX-License-Identifier: GPL-2.0+
2/*
3 * ehci-omap.c - driver for USBHOST on OMAP3/4 processors
4 *
5 * Bus Glue for the EHCI controllers in OMAP3/4
6 * Tested on several OMAP3 boards, and OMAP4 Pandaboard
7 *
8 * Copyright (C) 2007-2013 Texas Instruments, Inc.
9 * Author: Vikram Pandita <vikram.pandita@ti.com>
10 * Author: Anand Gadiyar <gadiyar@ti.com>
11 * Author: Keshava Munegowda <keshava_mgowda@ti.com>
12 * Author: Roger Quadros <rogerq@ti.com>
13 *
14 * Copyright (C) 2009 Nokia Corporation
15 * Contact: Felipe Balbi <felipe.balbi@nokia.com>
16 *
17 * Based on "ehci-fsl.c" and "ehci-au1xxx.c" ehci glue layers
18 */
19
20#include <linux/kernel.h>
21#include <linux/module.h>
22#include <linux/io.h>
23#include <linux/platform_device.h>
24#include <linux/slab.h>
25#include <linux/usb/ulpi.h>
26#include <linux/pm_runtime.h>
27#include <linux/clk.h>
28#include <linux/usb.h>
29#include <linux/usb/hcd.h>
30#include <linux/of.h>
31#include <linux/dma-mapping.h>
32
33#include "ehci.h"
34
35#include <linux/platform_data/usb-omap.h>
36
37/* EHCI Register Set */
38#define EHCI_INSNREG04 (0xA0)
39#define EHCI_INSNREG04_DISABLE_UNSUSPEND (1 << 5)
40#define EHCI_INSNREG05_ULPI (0xA4)
41#define EHCI_INSNREG05_ULPI_CONTROL_SHIFT 31
42#define EHCI_INSNREG05_ULPI_PORTSEL_SHIFT 24
43#define EHCI_INSNREG05_ULPI_OPSEL_SHIFT 22
44#define EHCI_INSNREG05_ULPI_REGADD_SHIFT 16
45#define EHCI_INSNREG05_ULPI_EXTREGADD_SHIFT 8
46#define EHCI_INSNREG05_ULPI_WRDATA_SHIFT 0
47
48#define DRIVER_DESC "OMAP-EHCI Host Controller driver"
49
50static const char hcd_name[] = "ehci-omap";
51
52/*-------------------------------------------------------------------------*/
53
54struct omap_hcd {
55 struct usb_phy *phy[OMAP3_HS_USB_PORTS]; /* one PHY for each port */
56 int nports;
57};
58
59static inline void ehci_write(void __iomem *base, u32 reg, u32 val)
60{
61 __raw_writel(val, base + reg);
62}
63
64static inline u32 ehci_read(void __iomem *base, u32 reg)
65{
66 return __raw_readl(base + reg);
67}
68
69/* configure so an HC device and id are always provided */
70/* always called with process context; sleeping is OK */
71
72static struct hc_driver __read_mostly ehci_omap_hc_driver;
73
74static const struct ehci_driver_overrides ehci_omap_overrides __initconst = {
75 .extra_priv_size = sizeof(struct omap_hcd),
76};
77
78/**
79 * ehci_hcd_omap_probe - initialize TI-based HCDs
80 * @pdev: Pointer to this platform device's information
81 *
82 * Allocates basic resources for this USB host controller, and
83 * then invokes the start() method for the HCD associated with it
84 * through the hotplug entry's driver_data.
85 */
86static int ehci_hcd_omap_probe(struct platform_device *pdev)
87{
88 struct device *dev = &pdev->dev;
89 struct usbhs_omap_platform_data *pdata = dev_get_platdata(dev);
90 struct resource *res;
91 struct usb_hcd *hcd;
92 void __iomem *regs;
93 int ret;
94 int irq;
95 int i;
96 struct omap_hcd *omap;
97
98 if (usb_disabled())
99 return -ENODEV;
100
101 if (!dev->parent) {
102 dev_err(dev, "Missing parent device\n");
103 return -ENODEV;
104 }
105
106 /* For DT boot, get platform data from parent. i.e. usbhshost */
107 if (dev->of_node) {
108 pdata = dev_get_platdata(dev->parent);
109 dev->platform_data = pdata;
110 }
111
112 if (!pdata) {
113 dev_err(dev, "Missing platform data\n");
114 return -ENODEV;
115 }
116
117 irq = platform_get_irq(pdev, 0);
118 if (irq < 0)
119 return irq;
120
121 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
122 regs = devm_ioremap_resource(dev, res);
123 if (IS_ERR(regs))
124 return PTR_ERR(regs);
125
126 /*
127 * Right now device-tree probed devices don't get dma_mask set.
128 * Since shared usb code relies on it, set it here for now.
129 * Once we have dma capability bindings this can go away.
130 */
131 ret = dma_coerce_mask_and_coherent(dev, DMA_BIT_MASK(32));
132 if (ret)
133 return ret;
134
135 ret = -ENODEV;
136 hcd = usb_create_hcd(&ehci_omap_hc_driver, dev,
137 dev_name(dev));
138 if (!hcd) {
139 dev_err(dev, "Failed to create HCD\n");
140 return -ENOMEM;
141 }
142
143 hcd->rsrc_start = res->start;
144 hcd->rsrc_len = resource_size(res);
145 hcd->regs = regs;
146 hcd_to_ehci(hcd)->caps = regs;
147
148 omap = (struct omap_hcd *)hcd_to_ehci(hcd)->priv;
149 omap->nports = pdata->nports;
150
151 platform_set_drvdata(pdev, hcd);
152
153 /* get the PHY devices if needed */
154 for (i = 0 ; i < omap->nports ; i++) {
155 struct usb_phy *phy;
156
157 /* get the PHY device */
158 phy = devm_usb_get_phy_by_phandle(dev, "phys", i);
159 if (IS_ERR(phy)) {
160 ret = PTR_ERR(phy);
161 if (ret == -ENODEV) { /* no PHY */
162 phy = NULL;
163 continue;
164 }
165
166 if (ret != -EPROBE_DEFER)
167 dev_err(dev, "Can't get PHY for port %d: %d\n",
168 i, ret);
169 goto err_phy;
170 }
171
172 omap->phy[i] = phy;
173
174 if (pdata->port_mode[i] == OMAP_EHCI_PORT_MODE_PHY) {
175 usb_phy_init(omap->phy[i]);
176 /* bring PHY out of suspend */
177 usb_phy_set_suspend(omap->phy[i], 0);
178 }
179 }
180
181 pm_runtime_enable(dev);
182 pm_runtime_get_sync(dev);
183
184 /*
185 * An undocumented "feature" in the OMAP3 EHCI controller,
186 * causes suspended ports to be taken out of suspend when
187 * the USBCMD.Run/Stop bit is cleared (for example when
188 * we do ehci_bus_suspend).
189 * This breaks suspend-resume if the root-hub is allowed
190 * to suspend. Writing 1 to this undocumented register bit
191 * disables this feature and restores normal behavior.
192 */
193 ehci_write(regs, EHCI_INSNREG04,
194 EHCI_INSNREG04_DISABLE_UNSUSPEND);
195
196 ret = usb_add_hcd(hcd, irq, IRQF_SHARED);
197 if (ret) {
198 dev_err(dev, "failed to add hcd with err %d\n", ret);
199 goto err_pm_runtime;
200 }
201 device_wakeup_enable(hcd->self.controller);
202
203 /*
204 * Bring PHYs out of reset for non PHY modes.
205 * Even though HSIC mode is a PHY-less mode, the reset
206 * line exists between the chips and can be modelled
207 * as a PHY device for reset control.
208 */
209 for (i = 0; i < omap->nports; i++) {
210 if (!omap->phy[i] ||
211 pdata->port_mode[i] == OMAP_EHCI_PORT_MODE_PHY)
212 continue;
213
214 usb_phy_init(omap->phy[i]);
215 /* bring PHY out of suspend */
216 usb_phy_set_suspend(omap->phy[i], 0);
217 }
218
219 return 0;
220
221err_pm_runtime:
222 pm_runtime_put_sync(dev);
223
224err_phy:
225 for (i = 0; i < omap->nports; i++) {
226 if (omap->phy[i])
227 usb_phy_shutdown(omap->phy[i]);
228 }
229
230 usb_put_hcd(hcd);
231
232 return ret;
233}
234
235
236/**
237 * ehci_hcd_omap_remove - shutdown processing for EHCI HCDs
238 * @pdev: USB Host Controller being removed
239 *
240 * Reverses the effect of usb_ehci_hcd_omap_probe(), first invoking
241 * the HCD's stop() method. It is always called from a thread
242 * context, normally "rmmod", "apmd", or something similar.
243 */
244static int ehci_hcd_omap_remove(struct platform_device *pdev)
245{
246 struct device *dev = &pdev->dev;
247 struct usb_hcd *hcd = dev_get_drvdata(dev);
248 struct omap_hcd *omap = (struct omap_hcd *)hcd_to_ehci(hcd)->priv;
249 int i;
250
251 usb_remove_hcd(hcd);
252
253 for (i = 0; i < omap->nports; i++) {
254 if (omap->phy[i])
255 usb_phy_shutdown(omap->phy[i]);
256 }
257
258 usb_put_hcd(hcd);
259 pm_runtime_put_sync(dev);
260 pm_runtime_disable(dev);
261
262 return 0;
263}
264
265static const struct of_device_id omap_ehci_dt_ids[] = {
266 { .compatible = "ti,ehci-omap" },
267 { }
268};
269
270MODULE_DEVICE_TABLE(of, omap_ehci_dt_ids);
271
272static struct platform_driver ehci_hcd_omap_driver = {
273 .probe = ehci_hcd_omap_probe,
274 .remove = ehci_hcd_omap_remove,
275 .shutdown = usb_hcd_platform_shutdown,
276 /*.suspend = ehci_hcd_omap_suspend, */
277 /*.resume = ehci_hcd_omap_resume, */
278 .driver = {
279 .name = hcd_name,
280 .of_match_table = omap_ehci_dt_ids,
281 }
282};
283
284/*-------------------------------------------------------------------------*/
285
286static int __init ehci_omap_init(void)
287{
288 if (usb_disabled())
289 return -ENODEV;
290
291 pr_info("%s: " DRIVER_DESC "\n", hcd_name);
292
293 ehci_init_driver(&ehci_omap_hc_driver, &ehci_omap_overrides);
294 return platform_driver_register(&ehci_hcd_omap_driver);
295}
296module_init(ehci_omap_init);
297
298static void __exit ehci_omap_cleanup(void)
299{
300 platform_driver_unregister(&ehci_hcd_omap_driver);
301}
302module_exit(ehci_omap_cleanup);
303
304MODULE_ALIAS("platform:ehci-omap");
305MODULE_AUTHOR("Texas Instruments, Inc.");
306MODULE_AUTHOR("Felipe Balbi <felipe.balbi@nokia.com>");
307MODULE_AUTHOR("Roger Quadros <rogerq@ti.com>");
308
309MODULE_DESCRIPTION(DRIVER_DESC);
310MODULE_LICENSE("GPL");