1 /*
2 * Driver for EHCI UHP on Atmel chips
3 *
4 * Copyright (C) 2009 Atmel Corporation,
5 * Nicolas Ferre <nicolas.ferre@atmel.com>
6 *
7 * Based on various ehci-*.c drivers
8 *
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
11 * more details.
12 */
13
14 #include <linux/clk.h>
15 #include <linux/platform_device.h>
16 #include <linux/of.h>
17 #include <linux/of_platform.h>
18
19 /* interface and function clocks */
20 static struct clk *iclk, *fclk;
21 static int clocked;
22
23 /*-------------------------------------------------------------------------*/
24
atmel_start_clock(void)25 static void atmel_start_clock(void)
26 {
27 clk_enable(iclk);
28 clk_enable(fclk);
29 clocked = 1;
30 }
31
atmel_stop_clock(void)32 static void atmel_stop_clock(void)
33 {
34 clk_disable(fclk);
35 clk_disable(iclk);
36 clocked = 0;
37 }
38
atmel_start_ehci(struct platform_device * pdev)39 static void atmel_start_ehci(struct platform_device *pdev)
40 {
41 dev_dbg(&pdev->dev, "start\n");
42 atmel_start_clock();
43 }
44
atmel_stop_ehci(struct platform_device * pdev)45 static void atmel_stop_ehci(struct platform_device *pdev)
46 {
47 dev_dbg(&pdev->dev, "stop\n");
48 atmel_stop_clock();
49 }
50
51 /*-------------------------------------------------------------------------*/
52
ehci_atmel_setup(struct usb_hcd * hcd)53 static int ehci_atmel_setup(struct usb_hcd *hcd)
54 {
55 struct ehci_hcd *ehci = hcd_to_ehci(hcd);
56 int retval = 0;
57
58 /* registers start at offset 0x0 */
59 ehci->caps = hcd->regs;
60 ehci->regs = hcd->regs +
61 HC_LENGTH(ehci, ehci_readl(ehci, &ehci->caps->hc_capbase));
62 dbg_hcs_params(ehci, "reset");
63 dbg_hcc_params(ehci, "reset");
64
65 /* cache this readonly data; minimize chip reads */
66 ehci->hcs_params = ehci_readl(ehci, &ehci->caps->hcs_params);
67
68 retval = ehci_halt(ehci);
69 if (retval)
70 return retval;
71
72 /* data structure init */
73 retval = ehci_init(hcd);
74 if (retval)
75 return retval;
76
77 ehci->sbrn = 0x20;
78
79 ehci_reset(ehci);
80 ehci_port_power(ehci, 0);
81
82 return retval;
83 }
84
85 static const struct hc_driver ehci_atmel_hc_driver = {
86 .description = hcd_name,
87 .product_desc = "Atmel EHCI UHP HS",
88 .hcd_priv_size = sizeof(struct ehci_hcd),
89
90 /* generic hardware linkage */
91 .irq = ehci_irq,
92 .flags = HCD_MEMORY | HCD_USB2,
93
94 /* basic lifecycle operations */
95 .reset = ehci_atmel_setup,
96 .start = ehci_run,
97 .stop = ehci_stop,
98 .shutdown = ehci_shutdown,
99
100 /* managing i/o requests and associated device resources */
101 .urb_enqueue = ehci_urb_enqueue,
102 .urb_dequeue = ehci_urb_dequeue,
103 .endpoint_disable = ehci_endpoint_disable,
104 .endpoint_reset = ehci_endpoint_reset,
105
106 /* scheduling support */
107 .get_frame_number = ehci_get_frame,
108
109 /* root hub support */
110 .hub_status_data = ehci_hub_status_data,
111 .hub_control = ehci_hub_control,
112 .bus_suspend = ehci_bus_suspend,
113 .bus_resume = ehci_bus_resume,
114 .relinquish_port = ehci_relinquish_port,
115 .port_handed_over = ehci_port_handed_over,
116
117 .clear_tt_buffer_complete = ehci_clear_tt_buffer_complete,
118 };
119
120 static u64 at91_ehci_dma_mask = DMA_BIT_MASK(32);
121
ehci_atmel_drv_probe(struct platform_device * pdev)122 static int __devinit ehci_atmel_drv_probe(struct platform_device *pdev)
123 {
124 struct usb_hcd *hcd;
125 const struct hc_driver *driver = &ehci_atmel_hc_driver;
126 struct resource *res;
127 int irq;
128 int retval;
129
130 if (usb_disabled())
131 return -ENODEV;
132
133 pr_debug("Initializing Atmel-SoC USB Host Controller\n");
134
135 irq = platform_get_irq(pdev, 0);
136 if (irq <= 0) {
137 dev_err(&pdev->dev,
138 "Found HC with no IRQ. Check %s setup!\n",
139 dev_name(&pdev->dev));
140 retval = -ENODEV;
141 goto fail_create_hcd;
142 }
143
144 /* Right now device-tree probed devices don't get dma_mask set.
145 * Since shared usb code relies on it, set it here for now.
146 * Once we have dma capability bindings this can go away.
147 */
148 if (!pdev->dev.dma_mask)
149 pdev->dev.dma_mask = &at91_ehci_dma_mask;
150
151 hcd = usb_create_hcd(driver, &pdev->dev, dev_name(&pdev->dev));
152 if (!hcd) {
153 retval = -ENOMEM;
154 goto fail_create_hcd;
155 }
156
157 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
158 if (!res) {
159 dev_err(&pdev->dev,
160 "Found HC with no register addr. Check %s setup!\n",
161 dev_name(&pdev->dev));
162 retval = -ENODEV;
163 goto fail_request_resource;
164 }
165 hcd->rsrc_start = res->start;
166 hcd->rsrc_len = resource_size(res);
167
168 if (!request_mem_region(hcd->rsrc_start, hcd->rsrc_len,
169 driver->description)) {
170 dev_dbg(&pdev->dev, "controller already in use\n");
171 retval = -EBUSY;
172 goto fail_request_resource;
173 }
174
175 hcd->regs = ioremap_nocache(hcd->rsrc_start, hcd->rsrc_len);
176 if (hcd->regs == NULL) {
177 dev_dbg(&pdev->dev, "error mapping memory\n");
178 retval = -EFAULT;
179 goto fail_ioremap;
180 }
181
182 iclk = clk_get(&pdev->dev, "ehci_clk");
183 if (IS_ERR(iclk)) {
184 dev_err(&pdev->dev, "Error getting interface clock\n");
185 retval = -ENOENT;
186 goto fail_get_iclk;
187 }
188 fclk = clk_get(&pdev->dev, "uhpck");
189 if (IS_ERR(fclk)) {
190 dev_err(&pdev->dev, "Error getting function clock\n");
191 retval = -ENOENT;
192 goto fail_get_fclk;
193 }
194
195 atmel_start_ehci(pdev);
196
197 retval = usb_add_hcd(hcd, irq, IRQF_SHARED);
198 if (retval)
199 goto fail_add_hcd;
200
201 return retval;
202
203 fail_add_hcd:
204 atmel_stop_ehci(pdev);
205 clk_put(fclk);
206 fail_get_fclk:
207 clk_put(iclk);
208 fail_get_iclk:
209 iounmap(hcd->regs);
210 fail_ioremap:
211 release_mem_region(hcd->rsrc_start, hcd->rsrc_len);
212 fail_request_resource:
213 usb_put_hcd(hcd);
214 fail_create_hcd:
215 dev_err(&pdev->dev, "init %s fail, %d\n",
216 dev_name(&pdev->dev), retval);
217
218 return retval;
219 }
220
ehci_atmel_drv_remove(struct platform_device * pdev)221 static int __devexit ehci_atmel_drv_remove(struct platform_device *pdev)
222 {
223 struct usb_hcd *hcd = platform_get_drvdata(pdev);
224
225 ehci_shutdown(hcd);
226 usb_remove_hcd(hcd);
227 iounmap(hcd->regs);
228 release_mem_region(hcd->rsrc_start, hcd->rsrc_len);
229 usb_put_hcd(hcd);
230
231 atmel_stop_ehci(pdev);
232 clk_put(fclk);
233 clk_put(iclk);
234 fclk = iclk = NULL;
235
236 return 0;
237 }
238
239 #ifdef CONFIG_OF
240 static const struct of_device_id atmel_ehci_dt_ids[] = {
241 { .compatible = "atmel,at91sam9g45-ehci" },
242 { /* sentinel */ }
243 };
244
245 MODULE_DEVICE_TABLE(of, atmel_ehci_dt_ids);
246 #endif
247
248 static struct platform_driver ehci_atmel_driver = {
249 .probe = ehci_atmel_drv_probe,
250 .remove = __devexit_p(ehci_atmel_drv_remove),
251 .shutdown = usb_hcd_platform_shutdown,
252 .driver = {
253 .name = "atmel-ehci",
254 .of_match_table = of_match_ptr(atmel_ehci_dt_ids),
255 },
256 };
257