Commit | Line | Data |
---|---|---|
c8c38de9 DS |
1 | /* |
2 | * OHCI HCD (Host Controller Driver) for USB. | |
3 | * | |
4 | * Copyright (C) 2010 ST Microelectronics. | |
5 | * Deepak Sikri<deepak.sikri@st.com> | |
6 | * | |
7 | * Based on various ohci-*.c drivers | |
8 | * | |
9 | * This file is licensed under the terms of the GNU General Public | |
10 | * License version 2. This program is licensed "as is" without any | |
11 | * warranty of any kind, whether express or implied. | |
12 | */ | |
13 | ||
14 | #include <linux/signal.h> | |
15 | #include <linux/platform_device.h> | |
16 | #include <linux/clk.h> | |
56fafb94 | 17 | #include <linux/of.h> |
c8c38de9 DS |
18 | |
19 | struct spear_ohci { | |
20 | struct ohci_hcd ohci; | |
21 | struct clk *clk; | |
22 | }; | |
23 | ||
24 | #define to_spear_ohci(hcd) (struct spear_ohci *)hcd_to_ohci(hcd) | |
25 | ||
26 | static void spear_start_ohci(struct spear_ohci *ohci) | |
27 | { | |
28 | clk_enable(ohci->clk); | |
29 | } | |
30 | ||
31 | static void spear_stop_ohci(struct spear_ohci *ohci) | |
32 | { | |
33 | clk_disable(ohci->clk); | |
34 | } | |
35 | ||
36 | static int __devinit ohci_spear_start(struct usb_hcd *hcd) | |
37 | { | |
38 | struct ohci_hcd *ohci = hcd_to_ohci(hcd); | |
39 | int ret; | |
40 | ||
41 | ret = ohci_init(ohci); | |
42 | if (ret < 0) | |
43 | return ret; | |
44 | ohci->regs = hcd->regs; | |
45 | ||
46 | ret = ohci_run(ohci); | |
47 | if (ret < 0) { | |
48 | dev_err(hcd->self.controller, "can't start\n"); | |
49 | ohci_stop(hcd); | |
50 | return ret; | |
51 | } | |
52 | ||
53 | create_debug_files(ohci); | |
54 | ||
55 | #ifdef DEBUG | |
56 | ohci_dump(ohci, 1); | |
57 | #endif | |
58 | return 0; | |
59 | } | |
60 | ||
61 | static const struct hc_driver ohci_spear_hc_driver = { | |
62 | .description = hcd_name, | |
63 | .product_desc = "SPEAr OHCI", | |
64 | .hcd_priv_size = sizeof(struct spear_ohci), | |
65 | ||
66 | /* generic hardware linkage */ | |
67 | .irq = ohci_irq, | |
68 | .flags = HCD_USB11 | HCD_MEMORY, | |
69 | ||
70 | /* basic lifecycle operations */ | |
71 | .start = ohci_spear_start, | |
72 | .stop = ohci_stop, | |
73 | .shutdown = ohci_shutdown, | |
74 | #ifdef CONFIG_PM | |
75 | .bus_suspend = ohci_bus_suspend, | |
76 | .bus_resume = ohci_bus_resume, | |
77 | #endif | |
78 | ||
79 | /* managing i/o requests and associated device resources */ | |
80 | .urb_enqueue = ohci_urb_enqueue, | |
81 | .urb_dequeue = ohci_urb_dequeue, | |
82 | .endpoint_disable = ohci_endpoint_disable, | |
83 | ||
84 | /* scheduling support */ | |
85 | .get_frame_number = ohci_get_frame, | |
86 | ||
87 | /* root hub support */ | |
88 | .hub_status_data = ohci_hub_status_data, | |
89 | .hub_control = ohci_hub_control, | |
90 | ||
91 | .start_port_reset = ohci_start_port_reset, | |
92 | }; | |
93 | ||
56fafb94 SR |
94 | static u64 spear_ohci_dma_mask = DMA_BIT_MASK(32); |
95 | ||
c8c38de9 DS |
96 | static int spear_ohci_hcd_drv_probe(struct platform_device *pdev) |
97 | { | |
98 | const struct hc_driver *driver = &ohci_spear_hc_driver; | |
99 | struct usb_hcd *hcd = NULL; | |
100 | struct clk *usbh_clk; | |
101 | struct spear_ohci *ohci_p; | |
102 | struct resource *res; | |
103 | int retval, irq; | |
c8c38de9 | 104 | char clk_name[20] = "usbh_clk"; |
56fafb94 | 105 | static int instance = -1; |
c8c38de9 DS |
106 | |
107 | irq = platform_get_irq(pdev, 0); | |
108 | if (irq < 0) { | |
109 | retval = irq; | |
110 | goto fail_irq_get; | |
111 | } | |
112 | ||
56fafb94 SR |
113 | /* |
114 | * Right now device-tree probed devices don't get dma_mask set. | |
115 | * Since shared usb code relies on it, set it here for now. | |
116 | * Once we have dma capability bindings this can go away. | |
117 | */ | |
118 | if (!pdev->dev.dma_mask) | |
119 | pdev->dev.dma_mask = &spear_ohci_dma_mask; | |
120 | ||
121 | /* | |
122 | * Increment the device instance, when probing via device-tree | |
123 | */ | |
124 | if (pdev->id < 0) | |
125 | instance++; | |
126 | else | |
127 | instance = pdev->id; | |
128 | sprintf(clk_name, "usbh.%01d_clk", instance); | |
c8c38de9 DS |
129 | |
130 | usbh_clk = clk_get(NULL, clk_name); | |
131 | if (IS_ERR(usbh_clk)) { | |
132 | dev_err(&pdev->dev, "Error getting interface clock\n"); | |
133 | retval = PTR_ERR(usbh_clk); | |
134 | goto fail_get_usbh_clk; | |
135 | } | |
136 | ||
137 | hcd = usb_create_hcd(driver, &pdev->dev, dev_name(&pdev->dev)); | |
138 | if (!hcd) { | |
139 | retval = -ENOMEM; | |
140 | goto fail_create_hcd; | |
141 | } | |
142 | ||
143 | res = platform_get_resource(pdev, IORESOURCE_MEM, 0); | |
144 | if (!res) { | |
145 | retval = -ENODEV; | |
146 | goto fail_request_resource; | |
147 | } | |
148 | ||
149 | hcd->rsrc_start = pdev->resource[0].start; | |
150 | hcd->rsrc_len = resource_size(res); | |
151 | if (!request_mem_region(hcd->rsrc_start, hcd->rsrc_len, hcd_name)) { | |
152 | dev_dbg(&pdev->dev, "request_mem_region failed\n"); | |
153 | retval = -EBUSY; | |
154 | goto fail_request_resource; | |
155 | } | |
156 | ||
157 | hcd->regs = ioremap(hcd->rsrc_start, hcd->rsrc_len); | |
158 | if (!hcd->regs) { | |
159 | dev_dbg(&pdev->dev, "ioremap failed\n"); | |
160 | retval = -ENOMEM; | |
161 | goto fail_ioremap; | |
162 | } | |
163 | ||
164 | ohci_p = (struct spear_ohci *)hcd_to_ohci(hcd); | |
165 | ohci_p->clk = usbh_clk; | |
166 | spear_start_ohci(ohci_p); | |
167 | ohci_hcd_init(hcd_to_ohci(hcd)); | |
168 | ||
b5dd18d8 | 169 | retval = usb_add_hcd(hcd, platform_get_irq(pdev, 0), 0); |
c8c38de9 DS |
170 | if (retval == 0) |
171 | return retval; | |
172 | ||
173 | spear_stop_ohci(ohci_p); | |
174 | iounmap(hcd->regs); | |
175 | fail_ioremap: | |
176 | release_mem_region(hcd->rsrc_start, hcd->rsrc_len); | |
177 | fail_request_resource: | |
178 | usb_put_hcd(hcd); | |
179 | fail_create_hcd: | |
180 | clk_put(usbh_clk); | |
181 | fail_get_usbh_clk: | |
182 | fail_irq_get: | |
183 | dev_err(&pdev->dev, "init fail, %d\n", retval); | |
184 | ||
185 | return retval; | |
186 | } | |
187 | ||
188 | static int spear_ohci_hcd_drv_remove(struct platform_device *pdev) | |
189 | { | |
190 | struct usb_hcd *hcd = platform_get_drvdata(pdev); | |
191 | struct spear_ohci *ohci_p = to_spear_ohci(hcd); | |
192 | ||
193 | usb_remove_hcd(hcd); | |
194 | if (ohci_p->clk) | |
195 | spear_stop_ohci(ohci_p); | |
196 | ||
197 | iounmap(hcd->regs); | |
198 | release_mem_region(hcd->rsrc_start, hcd->rsrc_len); | |
199 | usb_put_hcd(hcd); | |
200 | ||
201 | if (ohci_p->clk) | |
202 | clk_put(ohci_p->clk); | |
203 | platform_set_drvdata(pdev, NULL); | |
204 | return 0; | |
205 | } | |
206 | ||
207 | #if defined(CONFIG_PM) | |
208 | static int spear_ohci_hcd_drv_suspend(struct platform_device *dev, | |
209 | pm_message_t message) | |
210 | { | |
211 | struct usb_hcd *hcd = platform_get_drvdata(dev); | |
212 | struct ohci_hcd *ohci = hcd_to_ohci(hcd); | |
213 | struct spear_ohci *ohci_p = to_spear_ohci(hcd); | |
214 | ||
215 | if (time_before(jiffies, ohci->next_statechange)) | |
216 | msleep(5); | |
217 | ohci->next_statechange = jiffies; | |
218 | ||
219 | spear_stop_ohci(ohci_p); | |
c8c38de9 DS |
220 | return 0; |
221 | } | |
222 | ||
223 | static int spear_ohci_hcd_drv_resume(struct platform_device *dev) | |
224 | { | |
225 | struct usb_hcd *hcd = platform_get_drvdata(dev); | |
226 | struct ohci_hcd *ohci = hcd_to_ohci(hcd); | |
227 | struct spear_ohci *ohci_p = to_spear_ohci(hcd); | |
228 | ||
229 | if (time_before(jiffies, ohci->next_statechange)) | |
230 | msleep(5); | |
231 | ohci->next_statechange = jiffies; | |
232 | ||
233 | spear_start_ohci(ohci_p); | |
234 | ohci_finish_controller_resume(hcd); | |
235 | return 0; | |
236 | } | |
237 | #endif | |
238 | ||
56fafb94 SR |
239 | static struct of_device_id spear_ohci_id_table[] __devinitdata = { |
240 | { .compatible = "st,spear600-ohci", }, | |
241 | { }, | |
242 | }; | |
243 | ||
c8c38de9 DS |
244 | /* Driver definition to register with the platform bus */ |
245 | static struct platform_driver spear_ohci_hcd_driver = { | |
246 | .probe = spear_ohci_hcd_drv_probe, | |
247 | .remove = spear_ohci_hcd_drv_remove, | |
248 | #ifdef CONFIG_PM | |
249 | .suspend = spear_ohci_hcd_drv_suspend, | |
250 | .resume = spear_ohci_hcd_drv_resume, | |
251 | #endif | |
252 | .driver = { | |
253 | .owner = THIS_MODULE, | |
254 | .name = "spear-ohci", | |
56fafb94 | 255 | .of_match_table = of_match_ptr(spear_ohci_id_table), |
c8c38de9 DS |
256 | }, |
257 | }; | |
258 | ||
259 | MODULE_ALIAS("platform:spear-ohci"); |