2 * OHCI HCD (Host Controller Driver) for USB.
4 * Copyright (C) 2004 SAN People (Pty) Ltd.
5 * Copyright (C) 2005 Thibaut VARENE <varenet@parisc-linux.org>
9 * Based on fragments of 2.4 driver by Rick Bronson.
10 * Based on ohci-omap.c
12 * This file is licenced under the GPL.
15 #include <linux/clk.h>
16 #include <linux/platform_device.h>
18 #include <asm/mach-types.h>
19 #include <asm/hardware.h>
20 #include <asm/arch/board.h>
22 #ifndef CONFIG_ARCH_AT91
23 #error "CONFIG_ARCH_AT91 must be defined."
26 /* interface and function clocks */
27 static struct clk
*iclk
, *fclk
;
30 extern int usb_disabled(void);
32 /*-------------------------------------------------------------------------*/
34 static void at91_start_hc(struct platform_device
*pdev
)
36 struct usb_hcd
*hcd
= platform_get_drvdata(pdev
);
37 struct ohci_regs __iomem
*regs
= hcd
->regs
;
39 dev_dbg(&pdev
->dev
, "start\n");
42 * Start the USB clocks.
49 * The USB host controller must remain in reset.
51 writel(0, ®s
->control
);
54 static void at91_stop_hc(struct platform_device
*pdev
)
56 struct usb_hcd
*hcd
= platform_get_drvdata(pdev
);
57 struct ohci_regs __iomem
*regs
= hcd
->regs
;
59 dev_dbg(&pdev
->dev
, "stop\n");
62 * Put the USB host controller into reset.
64 writel(0, ®s
->control
);
67 * Stop the USB clocks.
75 /*-------------------------------------------------------------------------*/
77 static int usb_hcd_at91_remove (struct usb_hcd
*, struct platform_device
*);
79 /* configure so an HC device and id are always provided */
80 /* always called with process context; sleeping is OK */
84 * usb_hcd_at91_probe - initialize AT91-based HCDs
85 * Context: !in_interrupt()
87 * Allocates basic resources for this USB host controller, and
88 * then invokes the start() method for the HCD associated with it
89 * through the hotplug entry's driver_data.
91 static int usb_hcd_at91_probe(const struct hc_driver
*driver
,
92 struct platform_device
*pdev
)
95 struct usb_hcd
*hcd
= NULL
;
97 if (pdev
->num_resources
!= 2) {
98 pr_debug("hcd probe: invalid num_resources");
102 if ((pdev
->resource
[0].flags
!= IORESOURCE_MEM
)
103 || (pdev
->resource
[1].flags
!= IORESOURCE_IRQ
)) {
104 pr_debug("hcd probe: invalid resource type\n");
108 hcd
= usb_create_hcd(driver
, &pdev
->dev
, "at91");
111 hcd
->rsrc_start
= pdev
->resource
[0].start
;
112 hcd
->rsrc_len
= pdev
->resource
[0].end
- pdev
->resource
[0].start
+ 1;
114 if (!request_mem_region(hcd
->rsrc_start
, hcd
->rsrc_len
, hcd_name
)) {
115 pr_debug("request_mem_region failed\n");
120 hcd
->regs
= ioremap(hcd
->rsrc_start
, hcd
->rsrc_len
);
122 pr_debug("ioremap failed\n");
127 iclk
= clk_get(&pdev
->dev
, "ohci_clk");
128 fclk
= clk_get(&pdev
->dev
, "uhpck");
131 ohci_hcd_init(hcd_to_ohci(hcd
));
133 retval
= usb_add_hcd(hcd
, pdev
->resource
[1].start
, IRQF_DISABLED
);
146 release_mem_region(hcd
->rsrc_start
, hcd
->rsrc_len
);
154 /* may be called with controller, bus, and devices active */
157 * usb_hcd_at91_remove - shutdown processing for AT91-based HCDs
158 * @dev: USB Host Controller being removed
159 * Context: !in_interrupt()
161 * Reverses the effect of usb_hcd_at91_probe(), first invoking
162 * the HCD's stop() method. It is always called from a thread
163 * context, "rmmod" or something similar.
166 static int usb_hcd_at91_remove(struct usb_hcd
*hcd
,
167 struct platform_device
*pdev
)
172 release_mem_region(hcd
->rsrc_start
, hcd
->rsrc_len
);
178 dev_set_drvdata(&pdev
->dev
, NULL
);
182 /*-------------------------------------------------------------------------*/
185 ohci_at91_start (struct usb_hcd
*hcd
)
187 struct at91_usbh_data
*board
= hcd
->self
.controller
->platform_data
;
188 struct ohci_hcd
*ohci
= hcd_to_ohci (hcd
);
191 if ((ret
= ohci_init(ohci
)) < 0)
194 ohci
->num_ports
= board
->ports
;
196 if ((ret
= ohci_run(ohci
)) < 0) {
197 err("can't start %s", hcd
->self
.bus_name
);
204 /*-------------------------------------------------------------------------*/
206 static const struct hc_driver ohci_at91_hc_driver
= {
207 .description
= hcd_name
,
208 .product_desc
= "AT91 OHCI",
209 .hcd_priv_size
= sizeof(struct ohci_hcd
),
212 * generic hardware linkage
215 .flags
= HCD_USB11
| HCD_MEMORY
,
218 * basic lifecycle operations
220 .start
= ohci_at91_start
,
222 .shutdown
= ohci_shutdown
,
225 * managing i/o requests and associated device resources
227 .urb_enqueue
= ohci_urb_enqueue
,
228 .urb_dequeue
= ohci_urb_dequeue
,
229 .endpoint_disable
= ohci_endpoint_disable
,
234 .get_frame_number
= ohci_get_frame
,
239 .hub_status_data
= ohci_hub_status_data
,
240 .hub_control
= ohci_hub_control
,
241 .hub_irq_enable
= ohci_rhsc_enable
,
243 .bus_suspend
= ohci_bus_suspend
,
244 .bus_resume
= ohci_bus_resume
,
246 .start_port_reset
= ohci_start_port_reset
,
249 /*-------------------------------------------------------------------------*/
251 static int ohci_hcd_at91_drv_probe(struct platform_device
*pdev
)
253 device_init_wakeup(&pdev
->dev
, 1);
254 return usb_hcd_at91_probe(&ohci_at91_hc_driver
, pdev
);
257 static int ohci_hcd_at91_drv_remove(struct platform_device
*pdev
)
259 device_init_wakeup(&pdev
->dev
, 0);
260 return usb_hcd_at91_remove(platform_get_drvdata(pdev
), pdev
);
266 ohci_hcd_at91_drv_suspend(struct platform_device
*pdev
, pm_message_t mesg
)
268 struct usb_hcd
*hcd
= platform_get_drvdata(pdev
);
269 struct ohci_hcd
*ohci
= hcd_to_ohci(hcd
);
271 if (device_may_wakeup(&pdev
->dev
))
272 enable_irq_wake(hcd
->irq
);
275 * The integrated transceivers seem unable to notice disconnect,
276 * reconnect, or wakeup without the 48 MHz clock active. so for
277 * correctness, always discard connection state (using reset).
279 * REVISIT: some boards will be able to turn VBUS off...
281 if (at91_suspend_entering_slow_clock()) {
282 ohci_usb_reset (ohci
);
291 static int ohci_hcd_at91_drv_resume(struct platform_device
*pdev
)
293 struct usb_hcd
*hcd
= platform_get_drvdata(pdev
);
295 if (device_may_wakeup(&pdev
->dev
))
296 disable_irq_wake(hcd
->irq
);
307 #define ohci_hcd_at91_drv_suspend NULL
308 #define ohci_hcd_at91_drv_resume NULL
311 MODULE_ALIAS("at91_ohci");
313 static struct platform_driver ohci_hcd_at91_driver
= {
314 .probe
= ohci_hcd_at91_drv_probe
,
315 .remove
= ohci_hcd_at91_drv_remove
,
316 .shutdown
= usb_hcd_platform_shutdown
,
317 .suspend
= ohci_hcd_at91_drv_suspend
,
318 .resume
= ohci_hcd_at91_drv_resume
,
321 .owner
= THIS_MODULE
,