2 * Driver for EHCI UHP on Atmel chips
4 * Copyright (C) 2009 Atmel Corporation,
5 * Nicolas Ferre <nicolas.ferre@atmel.com>
7 * Based on various ehci-*.c drivers
9 * This file is subject to the terms and conditions of the GNU General Public
10 * License. See the file COPYING in the main directory of this archive for
14 #include <linux/clk.h>
15 #include <linux/platform_device.h>
16 #include <linux/of_platform.h>
18 /* interface and function clocks */
19 static struct clk *iclk, *fclk;
22 /*-------------------------------------------------------------------------*/
24 static void atmel_start_clock(void)
31 static void atmel_stop_clock(void)
38 static void atmel_start_ehci(struct platform_device *pdev)
40 dev_dbg(&pdev->dev, "start\n");
44 static void atmel_stop_ehci(struct platform_device *pdev)
46 dev_dbg(&pdev->dev, "stop\n");
50 /*-------------------------------------------------------------------------*/
52 static int ehci_atmel_setup(struct usb_hcd *hcd)
54 struct ehci_hcd *ehci = hcd_to_ehci(hcd);
57 /* registers start at offset 0x0 */
58 ehci->caps = hcd->regs;
59 ehci->regs = hcd->regs +
60 HC_LENGTH(ehci, ehci_readl(ehci, &ehci->caps->hc_capbase));
61 dbg_hcs_params(ehci, "reset");
62 dbg_hcc_params(ehci, "reset");
64 /* cache this readonly data; minimize chip reads */
65 ehci->hcs_params = ehci_readl(ehci, &ehci->caps->hcs_params);
67 retval = ehci_halt(ehci);
71 /* data structure init */
72 retval = ehci_init(hcd);
79 ehci_port_power(ehci, 0);
84 static const struct hc_driver ehci_atmel_hc_driver = {
85 .description = hcd_name,
86 .product_desc = "Atmel EHCI UHP HS",
87 .hcd_priv_size = sizeof(struct ehci_hcd),
89 /* generic hardware linkage */
91 .flags = HCD_MEMORY | HCD_USB2,
93 /* basic lifecycle operations */
94 .reset = ehci_atmel_setup,
97 .shutdown = ehci_shutdown,
99 /* managing i/o requests and associated device resources */
100 .urb_enqueue = ehci_urb_enqueue,
101 .urb_dequeue = ehci_urb_dequeue,
102 .endpoint_disable = ehci_endpoint_disable,
103 .endpoint_reset = ehci_endpoint_reset,
105 /* scheduling support */
106 .get_frame_number = ehci_get_frame,
108 /* root hub support */
109 .hub_status_data = ehci_hub_status_data,
110 .hub_control = ehci_hub_control,
111 .bus_suspend = ehci_bus_suspend,
112 .bus_resume = ehci_bus_resume,
113 .relinquish_port = ehci_relinquish_port,
114 .port_handed_over = ehci_port_handed_over,
116 .clear_tt_buffer_complete = ehci_clear_tt_buffer_complete,
119 static u64 at91_ehci_dma_mask = DMA_BIT_MASK(32);
121 static int __devinit ehci_atmel_drv_probe(struct platform_device *pdev)
124 const struct hc_driver *driver = &ehci_atmel_hc_driver;
125 struct resource *res;
132 pr_debug("Initializing Atmel-SoC USB Host Controller\n");
134 irq = platform_get_irq(pdev, 0);
137 "Found HC with no IRQ. Check %s setup!\n",
138 dev_name(&pdev->dev));
140 goto fail_create_hcd;
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 if (!pdev->dev.dma_mask)
148 pdev->dev.dma_mask = &at91_ehci_dma_mask;
150 hcd = usb_create_hcd(driver, &pdev->dev, dev_name(&pdev->dev));
153 goto fail_create_hcd;
156 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
159 "Found HC with no register addr. Check %s setup!\n",
160 dev_name(&pdev->dev));
162 goto fail_request_resource;
164 hcd->rsrc_start = res->start;
165 hcd->rsrc_len = resource_size(res);
167 if (!request_mem_region(hcd->rsrc_start, hcd->rsrc_len,
168 driver->description)) {
169 dev_dbg(&pdev->dev, "controller already in use\n");
171 goto fail_request_resource;
174 hcd->regs = ioremap_nocache(hcd->rsrc_start, hcd->rsrc_len);
175 if (hcd->regs == NULL) {
176 dev_dbg(&pdev->dev, "error mapping memory\n");
181 iclk = clk_get(&pdev->dev, "ehci_clk");
183 dev_err(&pdev->dev, "Error getting interface clock\n");
187 fclk = clk_get(&pdev->dev, "uhpck");
189 dev_err(&pdev->dev, "Error getting function clock\n");
194 atmel_start_ehci(pdev);
196 retval = usb_add_hcd(hcd, irq, IRQF_SHARED);
203 atmel_stop_ehci(pdev);
210 release_mem_region(hcd->rsrc_start, hcd->rsrc_len);
211 fail_request_resource:
214 dev_err(&pdev->dev, "init %s fail, %d\n",
215 dev_name(&pdev->dev), retval);
220 static int __devexit ehci_atmel_drv_remove(struct platform_device *pdev)
222 struct usb_hcd *hcd = platform_get_drvdata(pdev);
227 release_mem_region(hcd->rsrc_start, hcd->rsrc_len);
230 atmel_stop_ehci(pdev);
239 static const struct of_device_id atmel_ehci_dt_ids[] = {
240 { .compatible = "atmel,at91sam9g45-ehci" },
244 MODULE_DEVICE_TABLE(of, atmel_ehci_dt_ids);
247 static struct platform_driver ehci_atmel_driver = {
248 .probe = ehci_atmel_drv_probe,
249 .remove = __devexit_p(ehci_atmel_drv_remove),
250 .shutdown = usb_hcd_platform_shutdown,
252 .name = "atmel-ehci",
253 .of_match_table = of_match_ptr(atmel_ehci_dt_ids),