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1/*
2 * OHCI HCD (Host Controller Driver) for USB.
3 *
4 * Copyright (C) 2004 SAN People (Pty) Ltd.
5 * Copyright (C) 2005 Thibaut VARENE <varenet@parisc-linux.org>
6 *
7 * AT91 Bus Glue
8 *
9 * Based on fragments of 2.4 driver by Rick Bronson.
10 * Based on ohci-omap.c
11 *
12 * This file is licenced under the GPL.
13 */
14
15#include <linux/clk.h>
16#include <linux/platform_device.h>
17
18#include <mach/hardware.h>
19#include <asm/gpio.h>
20
21#include <mach/board.h>
22#include <mach/cpu.h>
23
24#ifndef CONFIG_ARCH_AT91
25#error "CONFIG_ARCH_AT91 must be defined."
26#endif
27
28/* interface and function clocks; sometimes also an AHB clock */
29static struct clk *iclk, *fclk, *hclk;
30static int clocked;
31
32extern int usb_disabled(void);
33
34/*-------------------------------------------------------------------------*/
35
36static void at91_start_clock(void)
37{
38 if (cpu_is_at91sam9261() || cpu_is_at91sam9g10())
39 clk_enable(hclk);
40 clk_enable(iclk);
41 clk_enable(fclk);
42 clocked = 1;
43}
44
45static void at91_stop_clock(void)
46{
47 clk_disable(fclk);
48 clk_disable(iclk);
49 if (cpu_is_at91sam9261() || cpu_is_at91sam9g10())
50 clk_disable(hclk);
51 clocked = 0;
52}
53
54static void at91_start_hc(struct platform_device *pdev)
55{
56 struct usb_hcd *hcd = platform_get_drvdata(pdev);
57 struct ohci_regs __iomem *regs = hcd->regs;
58
59 dev_dbg(&pdev->dev, "start\n");
60
61 /*
62 * Start the USB clocks.
63 */
64 at91_start_clock();
65
66 /*
67 * The USB host controller must remain in reset.
68 */
69 writel(0, ®s->control);
70}
71
72static void at91_stop_hc(struct platform_device *pdev)
73{
74 struct usb_hcd *hcd = platform_get_drvdata(pdev);
75 struct ohci_regs __iomem *regs = hcd->regs;
76
77 dev_dbg(&pdev->dev, "stop\n");
78
79 /*
80 * Put the USB host controller into reset.
81 */
82 writel(0, ®s->control);
83
84 /*
85 * Stop the USB clocks.
86 */
87 at91_stop_clock();
88}
89
90
91/*-------------------------------------------------------------------------*/
92
93static void usb_hcd_at91_remove (struct usb_hcd *, struct platform_device *);
94
95/* configure so an HC device and id are always provided */
96/* always called with process context; sleeping is OK */
97
98
99/**
100 * usb_hcd_at91_probe - initialize AT91-based HCDs
101 * Context: !in_interrupt()
102 *
103 * Allocates basic resources for this USB host controller, and
104 * then invokes the start() method for the HCD associated with it
105 * through the hotplug entry's driver_data.
106 */
107static int usb_hcd_at91_probe(const struct hc_driver *driver,
108 struct platform_device *pdev)
109{
110 int retval;
111 struct usb_hcd *hcd = NULL;
112
113 if (pdev->num_resources != 2) {
114 pr_debug("hcd probe: invalid num_resources");
115 return -ENODEV;
116 }
117
118 if ((pdev->resource[0].flags != IORESOURCE_MEM)
119 || (pdev->resource[1].flags != IORESOURCE_IRQ)) {
120 pr_debug("hcd probe: invalid resource type\n");
121 return -ENODEV;
122 }
123
124 hcd = usb_create_hcd(driver, &pdev->dev, "at91");
125 if (!hcd)
126 return -ENOMEM;
127 hcd->rsrc_start = pdev->resource[0].start;
128 hcd->rsrc_len = pdev->resource[0].end - pdev->resource[0].start + 1;
129
130 if (!request_mem_region(hcd->rsrc_start, hcd->rsrc_len, hcd_name)) {
131 pr_debug("request_mem_region failed\n");
132 retval = -EBUSY;
133 goto err1;
134 }
135
136 hcd->regs = ioremap(hcd->rsrc_start, hcd->rsrc_len);
137 if (!hcd->regs) {
138 pr_debug("ioremap failed\n");
139 retval = -EIO;
140 goto err2;
141 }
142
143 iclk = clk_get(&pdev->dev, "ohci_clk");
144 fclk = clk_get(&pdev->dev, "uhpck");
145 if (cpu_is_at91sam9261() || cpu_is_at91sam9g10())
146 hclk = clk_get(&pdev->dev, "hck0");
147
148 at91_start_hc(pdev);
149 ohci_hcd_init(hcd_to_ohci(hcd));
150
151 retval = usb_add_hcd(hcd, pdev->resource[1].start, IRQF_SHARED);
152 if (retval == 0)
153 return retval;
154
155 /* Error handling */
156 at91_stop_hc(pdev);
157
158 if (cpu_is_at91sam9261() || cpu_is_at91sam9g10())
159 clk_put(hclk);
160 clk_put(fclk);
161 clk_put(iclk);
162
163 iounmap(hcd->regs);
164
165 err2:
166 release_mem_region(hcd->rsrc_start, hcd->rsrc_len);
167
168 err1:
169 usb_put_hcd(hcd);
170 return retval;
171}
172
173
174/* may be called with controller, bus, and devices active */
175
176/**
177 * usb_hcd_at91_remove - shutdown processing for AT91-based HCDs
178 * @dev: USB Host Controller being removed
179 * Context: !in_interrupt()
180 *
181 * Reverses the effect of usb_hcd_at91_probe(), first invoking
182 * the HCD's stop() method. It is always called from a thread
183 * context, "rmmod" or something similar.
184 *
185 */
186static void usb_hcd_at91_remove(struct usb_hcd *hcd,
187 struct platform_device *pdev)
188{
189 usb_remove_hcd(hcd);
190 at91_stop_hc(pdev);
191 iounmap(hcd->regs);
192 release_mem_region(hcd->rsrc_start, hcd->rsrc_len);
193 usb_put_hcd(hcd);
194
195 if (cpu_is_at91sam9261() || cpu_is_at91sam9g10())
196 clk_put(hclk);
197 clk_put(fclk);
198 clk_put(iclk);
199 fclk = iclk = hclk = NULL;
200
201 dev_set_drvdata(&pdev->dev, NULL);
202}
203
204/*-------------------------------------------------------------------------*/
205
206static int __devinit
207ohci_at91_start (struct usb_hcd *hcd)
208{
209 struct at91_usbh_data *board = hcd->self.controller->platform_data;
210 struct ohci_hcd *ohci = hcd_to_ohci (hcd);
211 int ret;
212
213 if ((ret = ohci_init(ohci)) < 0)
214 return ret;
215
216 ohci->num_ports = board->ports;
217
218 if ((ret = ohci_run(ohci)) < 0) {
219 err("can't start %s", hcd->self.bus_name);
220 ohci_stop(hcd);
221 return ret;
222 }
223 return 0;
224}
225
226/*-------------------------------------------------------------------------*/
227
228static const struct hc_driver ohci_at91_hc_driver = {
229 .description = hcd_name,
230 .product_desc = "AT91 OHCI",
231 .hcd_priv_size = sizeof(struct ohci_hcd),
232
233 /*
234 * generic hardware linkage
235 */
236 .irq = ohci_irq,
237 .flags = HCD_USB11 | HCD_MEMORY,
238
239 /*
240 * basic lifecycle operations
241 */
242 .start = ohci_at91_start,
243 .stop = ohci_stop,
244 .shutdown = ohci_shutdown,
245
246 /*
247 * managing i/o requests and associated device resources
248 */
249 .urb_enqueue = ohci_urb_enqueue,
250 .urb_dequeue = ohci_urb_dequeue,
251 .endpoint_disable = ohci_endpoint_disable,
252
253 /*
254 * scheduling support
255 */
256 .get_frame_number = ohci_get_frame,
257
258 /*
259 * root hub support
260 */
261 .hub_status_data = ohci_hub_status_data,
262 .hub_control = ohci_hub_control,
263#ifdef CONFIG_PM
264 .bus_suspend = ohci_bus_suspend,
265 .bus_resume = ohci_bus_resume,
266#endif
267 .start_port_reset = ohci_start_port_reset,
268};
269
270/*-------------------------------------------------------------------------*/
271
272static int ohci_hcd_at91_drv_probe(struct platform_device *pdev)
273{
274 struct at91_usbh_data *pdata = pdev->dev.platform_data;
275 int i;
276
277 if (pdata) {
278 /* REVISIT make the driver support per-port power switching,
279 * and also overcurrent detection. Here we assume the ports
280 * are always powered while this driver is active, and use
281 * active-low power switches.
282 */
283 for (i = 0; i < ARRAY_SIZE(pdata->vbus_pin); i++) {
284 if (pdata->vbus_pin[i] <= 0)
285 continue;
286 gpio_request(pdata->vbus_pin[i], "ohci_vbus");
287 gpio_direction_output(pdata->vbus_pin[i], 0);
288 }
289 }
290
291 device_init_wakeup(&pdev->dev, 1);
292 return usb_hcd_at91_probe(&ohci_at91_hc_driver, pdev);
293}
294
295static int ohci_hcd_at91_drv_remove(struct platform_device *pdev)
296{
297 struct at91_usbh_data *pdata = pdev->dev.platform_data;
298 int i;
299
300 if (pdata) {
301 for (i = 0; i < ARRAY_SIZE(pdata->vbus_pin); i++) {
302 if (pdata->vbus_pin[i] <= 0)
303 continue;
304 gpio_direction_output(pdata->vbus_pin[i], 1);
305 gpio_free(pdata->vbus_pin[i]);
306 }
307 }
308
309 device_init_wakeup(&pdev->dev, 0);
310 usb_hcd_at91_remove(platform_get_drvdata(pdev), pdev);
311 return 0;
312}
313
314#ifdef CONFIG_PM
315
316static int
317ohci_hcd_at91_drv_suspend(struct platform_device *pdev, pm_message_t mesg)
318{
319 struct usb_hcd *hcd = platform_get_drvdata(pdev);
320 struct ohci_hcd *ohci = hcd_to_ohci(hcd);
321
322 if (device_may_wakeup(&pdev->dev))
323 enable_irq_wake(hcd->irq);
324
325 /*
326 * The integrated transceivers seem unable to notice disconnect,
327 * reconnect, or wakeup without the 48 MHz clock active. so for
328 * correctness, always discard connection state (using reset).
329 *
330 * REVISIT: some boards will be able to turn VBUS off...
331 */
332 if (at91_suspend_entering_slow_clock()) {
333 ohci_usb_reset (ohci);
334 /* flush the writes */
335 (void) ohci_readl (ohci, &ohci->regs->control);
336 at91_stop_clock();
337 }
338
339 return 0;
340}
341
342static int ohci_hcd_at91_drv_resume(struct platform_device *pdev)
343{
344 struct usb_hcd *hcd = platform_get_drvdata(pdev);
345
346 if (device_may_wakeup(&pdev->dev))
347 disable_irq_wake(hcd->irq);
348
349 if (!clocked)
350 at91_start_clock();
351
352 ohci_finish_controller_resume(hcd);
353 return 0;
354}
355#else
356#define ohci_hcd_at91_drv_suspend NULL
357#define ohci_hcd_at91_drv_resume NULL
358#endif
359
360MODULE_ALIAS("platform:at91_ohci");
361
362static struct platform_driver ohci_hcd_at91_driver = {
363 .probe = ohci_hcd_at91_drv_probe,
364 .remove = ohci_hcd_at91_drv_remove,
365 .shutdown = usb_hcd_platform_shutdown,
366 .suspend = ohci_hcd_at91_drv_suspend,
367 .resume = ohci_hcd_at91_drv_resume,
368 .driver = {
369 .name = "at91_ohci",
370 .owner = THIS_MODULE,
371 },
372};
1/*
2 * OHCI HCD (Host Controller Driver) for USB.
3 *
4 * Copyright (C) 2004 SAN People (Pty) Ltd.
5 * Copyright (C) 2005 Thibaut VARENE <varenet@parisc-linux.org>
6 *
7 * AT91 Bus Glue
8 *
9 * Based on fragments of 2.4 driver by Rick Bronson.
10 * Based on ohci-omap.c
11 *
12 * This file is licenced under the GPL.
13 */
14
15#include <linux/clk.h>
16#include <linux/dma-mapping.h>
17#include <linux/of_platform.h>
18#include <linux/of_gpio.h>
19#include <linux/platform_device.h>
20#include <linux/platform_data/atmel.h>
21#include <linux/io.h>
22#include <linux/kernel.h>
23#include <linux/module.h>
24#include <linux/usb.h>
25#include <linux/usb/hcd.h>
26
27#include <mach/hardware.h>
28#include <asm/gpio.h>
29
30#include <mach/cpu.h>
31
32
33#include "ohci.h"
34
35#define valid_port(index) ((index) >= 0 && (index) < AT91_MAX_USBH_PORTS)
36#define at91_for_each_port(index) \
37 for ((index) = 0; (index) < AT91_MAX_USBH_PORTS; (index)++)
38
39/* interface, function and usb clocks; sometimes also an AHB clock */
40static struct clk *iclk, *fclk, *uclk, *hclk;
41/* interface and function clocks; sometimes also an AHB clock */
42
43#define DRIVER_DESC "OHCI Atmel driver"
44
45static const char hcd_name[] = "ohci-atmel";
46
47static struct hc_driver __read_mostly ohci_at91_hc_driver;
48static int clocked;
49static int (*orig_ohci_hub_control)(struct usb_hcd *hcd, u16 typeReq,
50 u16 wValue, u16 wIndex, char *buf, u16 wLength);
51static int (*orig_ohci_hub_status_data)(struct usb_hcd *hcd, char *buf);
52
53extern int usb_disabled(void);
54
55/*-------------------------------------------------------------------------*/
56
57static void at91_start_clock(void)
58{
59 if (IS_ENABLED(CONFIG_COMMON_CLK)) {
60 clk_set_rate(uclk, 48000000);
61 clk_prepare_enable(uclk);
62 }
63 clk_prepare_enable(hclk);
64 clk_prepare_enable(iclk);
65 clk_prepare_enable(fclk);
66 clocked = 1;
67}
68
69static void at91_stop_clock(void)
70{
71 clk_disable_unprepare(fclk);
72 clk_disable_unprepare(iclk);
73 clk_disable_unprepare(hclk);
74 if (IS_ENABLED(CONFIG_COMMON_CLK))
75 clk_disable_unprepare(uclk);
76 clocked = 0;
77}
78
79static void at91_start_hc(struct platform_device *pdev)
80{
81 struct usb_hcd *hcd = platform_get_drvdata(pdev);
82 struct ohci_regs __iomem *regs = hcd->regs;
83
84 dev_dbg(&pdev->dev, "start\n");
85
86 /*
87 * Start the USB clocks.
88 */
89 at91_start_clock();
90
91 /*
92 * The USB host controller must remain in reset.
93 */
94 writel(0, ®s->control);
95}
96
97static void at91_stop_hc(struct platform_device *pdev)
98{
99 struct usb_hcd *hcd = platform_get_drvdata(pdev);
100 struct ohci_regs __iomem *regs = hcd->regs;
101
102 dev_dbg(&pdev->dev, "stop\n");
103
104 /*
105 * Put the USB host controller into reset.
106 */
107 writel(0, ®s->control);
108
109 /*
110 * Stop the USB clocks.
111 */
112 at91_stop_clock();
113}
114
115
116/*-------------------------------------------------------------------------*/
117
118static void usb_hcd_at91_remove (struct usb_hcd *, struct platform_device *);
119
120/* configure so an HC device and id are always provided */
121/* always called with process context; sleeping is OK */
122
123
124/**
125 * usb_hcd_at91_probe - initialize AT91-based HCDs
126 * Context: !in_interrupt()
127 *
128 * Allocates basic resources for this USB host controller, and
129 * then invokes the start() method for the HCD associated with it
130 * through the hotplug entry's driver_data.
131 */
132static int usb_hcd_at91_probe(const struct hc_driver *driver,
133 struct platform_device *pdev)
134{
135 struct at91_usbh_data *board;
136 struct ohci_hcd *ohci;
137 int retval;
138 struct usb_hcd *hcd = NULL;
139 struct device *dev = &pdev->dev;
140 struct resource *res;
141 int irq;
142
143 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
144 if (!res) {
145 dev_dbg(dev, "hcd probe: missing memory resource\n");
146 return -ENXIO;
147 }
148
149 irq = platform_get_irq(pdev, 0);
150 if (irq < 0) {
151 dev_dbg(dev, "hcd probe: missing irq resource\n");
152 return irq;
153 }
154
155 hcd = usb_create_hcd(driver, dev, "at91");
156 if (!hcd)
157 return -ENOMEM;
158 hcd->rsrc_start = res->start;
159 hcd->rsrc_len = resource_size(res);
160
161 hcd->regs = devm_ioremap_resource(dev, res);
162 if (IS_ERR(hcd->regs)) {
163 retval = PTR_ERR(hcd->regs);
164 goto err;
165 }
166
167 iclk = devm_clk_get(dev, "ohci_clk");
168 if (IS_ERR(iclk)) {
169 dev_err(dev, "failed to get ohci_clk\n");
170 retval = PTR_ERR(iclk);
171 goto err;
172 }
173 fclk = devm_clk_get(dev, "uhpck");
174 if (IS_ERR(fclk)) {
175 dev_err(dev, "failed to get uhpck\n");
176 retval = PTR_ERR(fclk);
177 goto err;
178 }
179 hclk = devm_clk_get(dev, "hclk");
180 if (IS_ERR(hclk)) {
181 dev_err(dev, "failed to get hclk\n");
182 retval = PTR_ERR(hclk);
183 goto err;
184 }
185 if (IS_ENABLED(CONFIG_COMMON_CLK)) {
186 uclk = devm_clk_get(dev, "usb_clk");
187 if (IS_ERR(uclk)) {
188 dev_err(dev, "failed to get uclk\n");
189 retval = PTR_ERR(uclk);
190 goto err;
191 }
192 }
193
194 board = hcd->self.controller->platform_data;
195 ohci = hcd_to_ohci(hcd);
196 ohci->num_ports = board->ports;
197 at91_start_hc(pdev);
198
199 retval = usb_add_hcd(hcd, irq, IRQF_SHARED);
200 if (retval == 0) {
201 device_wakeup_enable(hcd->self.controller);
202 return retval;
203 }
204
205 /* Error handling */
206 at91_stop_hc(pdev);
207
208 err:
209 usb_put_hcd(hcd);
210 return retval;
211}
212
213
214/* may be called with controller, bus, and devices active */
215
216/**
217 * usb_hcd_at91_remove - shutdown processing for AT91-based HCDs
218 * @dev: USB Host Controller being removed
219 * Context: !in_interrupt()
220 *
221 * Reverses the effect of usb_hcd_at91_probe(), first invoking
222 * the HCD's stop() method. It is always called from a thread
223 * context, "rmmod" or something similar.
224 *
225 */
226static void usb_hcd_at91_remove(struct usb_hcd *hcd,
227 struct platform_device *pdev)
228{
229 usb_remove_hcd(hcd);
230 at91_stop_hc(pdev);
231 usb_put_hcd(hcd);
232}
233
234/*-------------------------------------------------------------------------*/
235static void ohci_at91_usb_set_power(struct at91_usbh_data *pdata, int port, int enable)
236{
237 if (!valid_port(port))
238 return;
239
240 if (!gpio_is_valid(pdata->vbus_pin[port]))
241 return;
242
243 gpio_set_value(pdata->vbus_pin[port],
244 pdata->vbus_pin_active_low[port] ^ enable);
245}
246
247static int ohci_at91_usb_get_power(struct at91_usbh_data *pdata, int port)
248{
249 if (!valid_port(port))
250 return -EINVAL;
251
252 if (!gpio_is_valid(pdata->vbus_pin[port]))
253 return -EINVAL;
254
255 return gpio_get_value(pdata->vbus_pin[port]) ^
256 pdata->vbus_pin_active_low[port];
257}
258
259/*
260 * Update the status data from the hub with the over-current indicator change.
261 */
262static int ohci_at91_hub_status_data(struct usb_hcd *hcd, char *buf)
263{
264 struct at91_usbh_data *pdata = hcd->self.controller->platform_data;
265 int length = orig_ohci_hub_status_data(hcd, buf);
266 int port;
267
268 at91_for_each_port(port) {
269 if (pdata->overcurrent_changed[port]) {
270 if (!length)
271 length = 1;
272 buf[0] |= 1 << (port + 1);
273 }
274 }
275
276 return length;
277}
278
279/*
280 * Look at the control requests to the root hub and see if we need to override.
281 */
282static int ohci_at91_hub_control(struct usb_hcd *hcd, u16 typeReq, u16 wValue,
283 u16 wIndex, char *buf, u16 wLength)
284{
285 struct at91_usbh_data *pdata = dev_get_platdata(hcd->self.controller);
286 struct usb_hub_descriptor *desc;
287 int ret = -EINVAL;
288 u32 *data = (u32 *)buf;
289
290 dev_dbg(hcd->self.controller,
291 "ohci_at91_hub_control(%p,0x%04x,0x%04x,0x%04x,%p,%04x)\n",
292 hcd, typeReq, wValue, wIndex, buf, wLength);
293
294 wIndex--;
295
296 switch (typeReq) {
297 case SetPortFeature:
298 if (wValue == USB_PORT_FEAT_POWER) {
299 dev_dbg(hcd->self.controller, "SetPortFeat: POWER\n");
300 if (valid_port(wIndex)) {
301 ohci_at91_usb_set_power(pdata, wIndex, 1);
302 ret = 0;
303 }
304
305 goto out;
306 }
307 break;
308
309 case ClearPortFeature:
310 switch (wValue) {
311 case USB_PORT_FEAT_C_OVER_CURRENT:
312 dev_dbg(hcd->self.controller,
313 "ClearPortFeature: C_OVER_CURRENT\n");
314
315 if (valid_port(wIndex)) {
316 pdata->overcurrent_changed[wIndex] = 0;
317 pdata->overcurrent_status[wIndex] = 0;
318 }
319
320 goto out;
321
322 case USB_PORT_FEAT_OVER_CURRENT:
323 dev_dbg(hcd->self.controller,
324 "ClearPortFeature: OVER_CURRENT\n");
325
326 if (valid_port(wIndex))
327 pdata->overcurrent_status[wIndex] = 0;
328
329 goto out;
330
331 case USB_PORT_FEAT_POWER:
332 dev_dbg(hcd->self.controller,
333 "ClearPortFeature: POWER\n");
334
335 if (valid_port(wIndex)) {
336 ohci_at91_usb_set_power(pdata, wIndex, 0);
337 return 0;
338 }
339 }
340 break;
341 }
342
343 ret = orig_ohci_hub_control(hcd, typeReq, wValue, wIndex + 1,
344 buf, wLength);
345 if (ret)
346 goto out;
347
348 switch (typeReq) {
349 case GetHubDescriptor:
350
351 /* update the hub's descriptor */
352
353 desc = (struct usb_hub_descriptor *)buf;
354
355 dev_dbg(hcd->self.controller, "wHubCharacteristics 0x%04x\n",
356 desc->wHubCharacteristics);
357
358 /* remove the old configurations for power-switching, and
359 * over-current protection, and insert our new configuration
360 */
361
362 desc->wHubCharacteristics &= ~cpu_to_le16(HUB_CHAR_LPSM);
363 desc->wHubCharacteristics |= cpu_to_le16(0x0001);
364
365 if (pdata->overcurrent_supported) {
366 desc->wHubCharacteristics &= ~cpu_to_le16(HUB_CHAR_OCPM);
367 desc->wHubCharacteristics |= cpu_to_le16(0x0008|0x0001);
368 }
369
370 dev_dbg(hcd->self.controller, "wHubCharacteristics after 0x%04x\n",
371 desc->wHubCharacteristics);
372
373 return ret;
374
375 case GetPortStatus:
376 /* check port status */
377
378 dev_dbg(hcd->self.controller, "GetPortStatus(%d)\n", wIndex);
379
380 if (valid_port(wIndex)) {
381 if (!ohci_at91_usb_get_power(pdata, wIndex))
382 *data &= ~cpu_to_le32(RH_PS_PPS);
383
384 if (pdata->overcurrent_changed[wIndex])
385 *data |= cpu_to_le32(RH_PS_OCIC);
386
387 if (pdata->overcurrent_status[wIndex])
388 *data |= cpu_to_le32(RH_PS_POCI);
389 }
390 }
391
392 out:
393 return ret;
394}
395
396/*-------------------------------------------------------------------------*/
397
398static irqreturn_t ohci_hcd_at91_overcurrent_irq(int irq, void *data)
399{
400 struct platform_device *pdev = data;
401 struct at91_usbh_data *pdata = dev_get_platdata(&pdev->dev);
402 int val, gpio, port;
403
404 /* From the GPIO notifying the over-current situation, find
405 * out the corresponding port */
406 at91_for_each_port(port) {
407 if (gpio_is_valid(pdata->overcurrent_pin[port]) &&
408 gpio_to_irq(pdata->overcurrent_pin[port]) == irq) {
409 gpio = pdata->overcurrent_pin[port];
410 break;
411 }
412 }
413
414 if (port == AT91_MAX_USBH_PORTS) {
415 dev_err(& pdev->dev, "overcurrent interrupt from unknown GPIO\n");
416 return IRQ_HANDLED;
417 }
418
419 val = gpio_get_value(gpio);
420
421 /* When notified of an over-current situation, disable power
422 on the corresponding port, and mark this port in
423 over-current. */
424 if (!val) {
425 ohci_at91_usb_set_power(pdata, port, 0);
426 pdata->overcurrent_status[port] = 1;
427 pdata->overcurrent_changed[port] = 1;
428 }
429
430 dev_dbg(& pdev->dev, "overcurrent situation %s\n",
431 val ? "exited" : "notified");
432
433 return IRQ_HANDLED;
434}
435
436#ifdef CONFIG_OF
437static const struct of_device_id at91_ohci_dt_ids[] = {
438 { .compatible = "atmel,at91rm9200-ohci" },
439 { /* sentinel */ }
440};
441
442MODULE_DEVICE_TABLE(of, at91_ohci_dt_ids);
443
444static int ohci_at91_of_init(struct platform_device *pdev)
445{
446 struct device_node *np = pdev->dev.of_node;
447 int i, gpio, ret;
448 enum of_gpio_flags flags;
449 struct at91_usbh_data *pdata;
450 u32 ports;
451
452 if (!np)
453 return 0;
454
455 /* Right now device-tree probed devices don't get dma_mask set.
456 * Since shared usb code relies on it, set it here for now.
457 * Once we have dma capability bindings this can go away.
458 */
459 ret = dma_coerce_mask_and_coherent(&pdev->dev, DMA_BIT_MASK(32));
460 if (ret)
461 return ret;
462
463 pdata = devm_kzalloc(&pdev->dev, sizeof(*pdata), GFP_KERNEL);
464 if (!pdata)
465 return -ENOMEM;
466
467 if (!of_property_read_u32(np, "num-ports", &ports))
468 pdata->ports = ports;
469
470 at91_for_each_port(i) {
471 gpio = of_get_named_gpio_flags(np, "atmel,vbus-gpio", i, &flags);
472 pdata->vbus_pin[i] = gpio;
473 if (!gpio_is_valid(gpio))
474 continue;
475 pdata->vbus_pin_active_low[i] = flags & OF_GPIO_ACTIVE_LOW;
476 }
477
478 at91_for_each_port(i)
479 pdata->overcurrent_pin[i] =
480 of_get_named_gpio_flags(np, "atmel,oc-gpio", i, &flags);
481
482 pdev->dev.platform_data = pdata;
483
484 return 0;
485}
486#else
487static int ohci_at91_of_init(struct platform_device *pdev)
488{
489 return 0;
490}
491#endif
492
493/*-------------------------------------------------------------------------*/
494
495static int ohci_hcd_at91_drv_probe(struct platform_device *pdev)
496{
497 struct at91_usbh_data *pdata;
498 int i;
499 int gpio;
500 int ret;
501
502 ret = ohci_at91_of_init(pdev);
503 if (ret)
504 return ret;
505
506 pdata = dev_get_platdata(&pdev->dev);
507
508 if (pdata) {
509 at91_for_each_port(i) {
510 /*
511 * do not configure PIO if not in relation with
512 * real USB port on board
513 */
514 if (i >= pdata->ports) {
515 pdata->vbus_pin[i] = -EINVAL;
516 pdata->overcurrent_pin[i] = -EINVAL;
517 break;
518 }
519
520 if (!gpio_is_valid(pdata->vbus_pin[i]))
521 continue;
522 gpio = pdata->vbus_pin[i];
523
524 ret = gpio_request(gpio, "ohci_vbus");
525 if (ret) {
526 dev_err(&pdev->dev,
527 "can't request vbus gpio %d\n", gpio);
528 continue;
529 }
530 ret = gpio_direction_output(gpio,
531 !pdata->vbus_pin_active_low[i]);
532 if (ret) {
533 dev_err(&pdev->dev,
534 "can't put vbus gpio %d as output %d\n",
535 gpio, !pdata->vbus_pin_active_low[i]);
536 gpio_free(gpio);
537 continue;
538 }
539
540 ohci_at91_usb_set_power(pdata, i, 1);
541 }
542
543 at91_for_each_port(i) {
544 if (!gpio_is_valid(pdata->overcurrent_pin[i]))
545 continue;
546 gpio = pdata->overcurrent_pin[i];
547
548 ret = gpio_request(gpio, "ohci_overcurrent");
549 if (ret) {
550 dev_err(&pdev->dev,
551 "can't request overcurrent gpio %d\n",
552 gpio);
553 continue;
554 }
555
556 ret = gpio_direction_input(gpio);
557 if (ret) {
558 dev_err(&pdev->dev,
559 "can't configure overcurrent gpio %d as input\n",
560 gpio);
561 gpio_free(gpio);
562 continue;
563 }
564
565 ret = request_irq(gpio_to_irq(gpio),
566 ohci_hcd_at91_overcurrent_irq,
567 IRQF_SHARED, "ohci_overcurrent", pdev);
568 if (ret) {
569 gpio_free(gpio);
570 dev_err(&pdev->dev,
571 "can't get gpio IRQ for overcurrent\n");
572 }
573 }
574 }
575
576 device_init_wakeup(&pdev->dev, 1);
577 return usb_hcd_at91_probe(&ohci_at91_hc_driver, pdev);
578}
579
580static int ohci_hcd_at91_drv_remove(struct platform_device *pdev)
581{
582 struct at91_usbh_data *pdata = dev_get_platdata(&pdev->dev);
583 int i;
584
585 if (pdata) {
586 at91_for_each_port(i) {
587 if (!gpio_is_valid(pdata->vbus_pin[i]))
588 continue;
589 ohci_at91_usb_set_power(pdata, i, 0);
590 gpio_free(pdata->vbus_pin[i]);
591 }
592
593 at91_for_each_port(i) {
594 if (!gpio_is_valid(pdata->overcurrent_pin[i]))
595 continue;
596 free_irq(gpio_to_irq(pdata->overcurrent_pin[i]), pdev);
597 gpio_free(pdata->overcurrent_pin[i]);
598 }
599 }
600
601 device_init_wakeup(&pdev->dev, 0);
602 usb_hcd_at91_remove(platform_get_drvdata(pdev), pdev);
603 return 0;
604}
605
606#ifdef CONFIG_PM
607
608static int
609ohci_hcd_at91_drv_suspend(struct platform_device *pdev, pm_message_t mesg)
610{
611 struct usb_hcd *hcd = platform_get_drvdata(pdev);
612 struct ohci_hcd *ohci = hcd_to_ohci(hcd);
613 bool do_wakeup = device_may_wakeup(&pdev->dev);
614 int ret;
615
616 if (do_wakeup)
617 enable_irq_wake(hcd->irq);
618
619 ret = ohci_suspend(hcd, do_wakeup);
620 if (ret) {
621 disable_irq_wake(hcd->irq);
622 return ret;
623 }
624 /*
625 * The integrated transceivers seem unable to notice disconnect,
626 * reconnect, or wakeup without the 48 MHz clock active. so for
627 * correctness, always discard connection state (using reset).
628 *
629 * REVISIT: some boards will be able to turn VBUS off...
630 */
631 if (at91_suspend_entering_slow_clock()) {
632 ohci->hc_control = ohci_readl(ohci, &ohci->regs->control);
633 ohci->hc_control &= OHCI_CTRL_RWC;
634 ohci_writel(ohci, ohci->hc_control, &ohci->regs->control);
635 ohci->rh_state = OHCI_RH_HALTED;
636
637 /* flush the writes */
638 (void) ohci_readl (ohci, &ohci->regs->control);
639 at91_stop_clock();
640 }
641
642 return ret;
643}
644
645static int ohci_hcd_at91_drv_resume(struct platform_device *pdev)
646{
647 struct usb_hcd *hcd = platform_get_drvdata(pdev);
648
649 if (device_may_wakeup(&pdev->dev))
650 disable_irq_wake(hcd->irq);
651
652 if (!clocked)
653 at91_start_clock();
654
655 ohci_resume(hcd, false);
656 return 0;
657}
658#else
659#define ohci_hcd_at91_drv_suspend NULL
660#define ohci_hcd_at91_drv_resume NULL
661#endif
662
663static struct platform_driver ohci_hcd_at91_driver = {
664 .probe = ohci_hcd_at91_drv_probe,
665 .remove = ohci_hcd_at91_drv_remove,
666 .shutdown = usb_hcd_platform_shutdown,
667 .suspend = ohci_hcd_at91_drv_suspend,
668 .resume = ohci_hcd_at91_drv_resume,
669 .driver = {
670 .name = "at91_ohci",
671 .owner = THIS_MODULE,
672 .of_match_table = of_match_ptr(at91_ohci_dt_ids),
673 },
674};
675
676static int __init ohci_at91_init(void)
677{
678 if (usb_disabled())
679 return -ENODEV;
680
681 pr_info("%s: " DRIVER_DESC "\n", hcd_name);
682 ohci_init_driver(&ohci_at91_hc_driver, NULL);
683
684 /*
685 * The Atmel HW has some unusual quirks, which require Atmel-specific
686 * workarounds. We override certain hc_driver functions here to
687 * achieve that. We explicitly do not enhance ohci_driver_overrides to
688 * allow this more easily, since this is an unusual case, and we don't
689 * want to encourage others to override these functions by making it
690 * too easy.
691 */
692
693 orig_ohci_hub_control = ohci_at91_hc_driver.hub_control;
694 orig_ohci_hub_status_data = ohci_at91_hc_driver.hub_status_data;
695
696 ohci_at91_hc_driver.hub_status_data = ohci_at91_hub_status_data;
697 ohci_at91_hc_driver.hub_control = ohci_at91_hub_control;
698
699 return platform_driver_register(&ohci_hcd_at91_driver);
700}
701module_init(ohci_at91_init);
702
703static void __exit ohci_at91_cleanup(void)
704{
705 platform_driver_unregister(&ohci_hcd_at91_driver);
706}
707module_exit(ohci_at91_cleanup);
708
709MODULE_DESCRIPTION(DRIVER_DESC);
710MODULE_LICENSE("GPL");
711MODULE_ALIAS("platform:at91_ohci");