Commit | Line | Data |
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c8c38de9 DS |
1 | /* |
2 | * Driver for EHCI HCD on SPEAR SOC | |
3 | * | |
4 | * Copyright (C) 2010 ST Micro Electronics, | |
5 | * Deepak Sikri <deepak.sikri@st.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 | ||
c8c38de9 | 14 | #include <linux/clk.h> |
8c1b3693 | 15 | #include <linux/jiffies.h> |
56fafb94 | 16 | #include <linux/of.h> |
8c1b3693 DS |
17 | #include <linux/platform_device.h> |
18 | #include <linux/pm.h> | |
c8c38de9 DS |
19 | |
20 | struct spear_ehci { | |
21 | struct ehci_hcd ehci; | |
22 | struct clk *clk; | |
23 | }; | |
24 | ||
25 | #define to_spear_ehci(hcd) (struct spear_ehci *)hcd_to_ehci(hcd) | |
26 | ||
27 | static void spear_start_ehci(struct spear_ehci *ehci) | |
28 | { | |
29 | clk_enable(ehci->clk); | |
30 | } | |
31 | ||
32 | static void spear_stop_ehci(struct spear_ehci *ehci) | |
33 | { | |
34 | clk_disable(ehci->clk); | |
35 | } | |
36 | ||
37 | static int ehci_spear_setup(struct usb_hcd *hcd) | |
38 | { | |
39 | struct ehci_hcd *ehci = hcd_to_ehci(hcd); | |
40 | int retval = 0; | |
41 | ||
42 | /* registers start at offset 0x0 */ | |
43 | ehci->caps = hcd->regs; | |
c430131a | 44 | ehci->regs = hcd->regs + HC_LENGTH(ehci, ehci_readl(ehci, |
c8c38de9 DS |
45 | &ehci->caps->hc_capbase)); |
46 | /* cache this readonly data; minimize chip reads */ | |
47 | ehci->hcs_params = ehci_readl(ehci, &ehci->caps->hcs_params); | |
48 | retval = ehci_halt(ehci); | |
49 | if (retval) | |
50 | return retval; | |
51 | ||
52 | retval = ehci_init(hcd); | |
53 | if (retval) | |
54 | return retval; | |
55 | ||
56 | ehci_reset(ehci); | |
57 | ehci_port_power(ehci, 0); | |
58 | ||
59 | return retval; | |
60 | } | |
61 | ||
62 | static const struct hc_driver ehci_spear_hc_driver = { | |
63 | .description = hcd_name, | |
64 | .product_desc = "SPEAr EHCI", | |
65 | .hcd_priv_size = sizeof(struct spear_ehci), | |
66 | ||
67 | /* generic hardware linkage */ | |
68 | .irq = ehci_irq, | |
69 | .flags = HCD_MEMORY | HCD_USB2, | |
70 | ||
71 | /* basic lifecycle operations */ | |
72 | .reset = ehci_spear_setup, | |
73 | .start = ehci_run, | |
74 | .stop = ehci_stop, | |
75 | .shutdown = ehci_shutdown, | |
76 | ||
77 | /* managing i/o requests and associated device resources */ | |
78 | .urb_enqueue = ehci_urb_enqueue, | |
79 | .urb_dequeue = ehci_urb_dequeue, | |
80 | .endpoint_disable = ehci_endpoint_disable, | |
81 | .endpoint_reset = ehci_endpoint_reset, | |
82 | ||
83 | /* scheduling support */ | |
84 | .get_frame_number = ehci_get_frame, | |
85 | ||
86 | /* root hub support */ | |
87 | .hub_status_data = ehci_hub_status_data, | |
88 | .hub_control = ehci_hub_control, | |
89 | .bus_suspend = ehci_bus_suspend, | |
90 | .bus_resume = ehci_bus_resume, | |
91 | .relinquish_port = ehci_relinquish_port, | |
92 | .port_handed_over = ehci_port_handed_over, | |
93 | .clear_tt_buffer_complete = ehci_clear_tt_buffer_complete, | |
94 | }; | |
95 | ||
8c1b3693 DS |
96 | #ifdef CONFIG_PM |
97 | static int ehci_spear_drv_suspend(struct device *dev) | |
98 | { | |
99 | struct usb_hcd *hcd = dev_get_drvdata(dev); | |
100 | struct ehci_hcd *ehci = hcd_to_ehci(hcd); | |
101 | unsigned long flags; | |
102 | int rc = 0; | |
103 | ||
104 | if (time_before(jiffies, ehci->next_statechange)) | |
105 | msleep(10); | |
106 | ||
107 | /* | |
108 | * Root hub was already suspended. Disable irq emission and mark HW | |
109 | * unaccessible. The PM and USB cores make sure that the root hub is | |
110 | * either suspended or stopped. | |
111 | */ | |
112 | spin_lock_irqsave(&ehci->lock, flags); | |
113 | ehci_prepare_ports_for_controller_suspend(ehci, device_may_wakeup(dev)); | |
114 | ehci_writel(ehci, 0, &ehci->regs->intr_enable); | |
115 | ehci_readl(ehci, &ehci->regs->intr_enable); | |
116 | spin_unlock_irqrestore(&ehci->lock, flags); | |
117 | ||
118 | return rc; | |
119 | } | |
120 | ||
121 | static int ehci_spear_drv_resume(struct device *dev) | |
122 | { | |
123 | struct usb_hcd *hcd = dev_get_drvdata(dev); | |
124 | struct ehci_hcd *ehci = hcd_to_ehci(hcd); | |
125 | ||
126 | if (time_before(jiffies, ehci->next_statechange)) | |
127 | msleep(100); | |
128 | ||
129 | if (ehci_readl(ehci, &ehci->regs->configured_flag) == FLAG_CF) { | |
130 | int mask = INTR_MASK; | |
131 | ||
132 | ehci_prepare_ports_for_controller_resume(ehci); | |
133 | ||
134 | if (!hcd->self.root_hub->do_remote_wakeup) | |
135 | mask &= ~STS_PCD; | |
136 | ||
137 | ehci_writel(ehci, mask, &ehci->regs->intr_enable); | |
138 | ehci_readl(ehci, &ehci->regs->intr_enable); | |
139 | return 0; | |
140 | } | |
141 | ||
142 | usb_root_hub_lost_power(hcd->self.root_hub); | |
143 | ||
144 | /* | |
145 | * Else reset, to cope with power loss or flush-to-storage style | |
146 | * "resume" having let BIOS kick in during reboot. | |
147 | */ | |
148 | ehci_halt(ehci); | |
149 | ehci_reset(ehci); | |
150 | ||
151 | /* emptying the schedule aborts any urbs */ | |
152 | spin_lock_irq(&ehci->lock); | |
153 | if (ehci->reclaim) | |
154 | end_unlink_async(ehci); | |
155 | ||
156 | ehci_work(ehci); | |
157 | spin_unlock_irq(&ehci->lock); | |
158 | ||
159 | ehci_writel(ehci, ehci->command, &ehci->regs->command); | |
160 | ehci_writel(ehci, FLAG_CF, &ehci->regs->configured_flag); | |
161 | ehci_readl(ehci, &ehci->regs->command); /* unblock posted writes */ | |
162 | ||
163 | /* here we "know" root ports should always stay powered */ | |
164 | ehci_port_power(ehci, 1); | |
165 | return 0; | |
166 | } | |
167 | #endif /* CONFIG_PM */ | |
168 | ||
169 | static SIMPLE_DEV_PM_OPS(ehci_spear_pm_ops, ehci_spear_drv_suspend, | |
170 | ehci_spear_drv_resume); | |
171 | ||
56fafb94 SR |
172 | static u64 spear_ehci_dma_mask = DMA_BIT_MASK(32); |
173 | ||
c8c38de9 DS |
174 | static int spear_ehci_hcd_drv_probe(struct platform_device *pdev) |
175 | { | |
176 | struct usb_hcd *hcd ; | |
177 | struct spear_ehci *ehci; | |
178 | struct resource *res; | |
179 | struct clk *usbh_clk; | |
180 | const struct hc_driver *driver = &ehci_spear_hc_driver; | |
c8c38de9 DS |
181 | int irq, retval; |
182 | char clk_name[20] = "usbh_clk"; | |
56fafb94 | 183 | static int instance = -1; |
c8c38de9 DS |
184 | |
185 | if (usb_disabled()) | |
186 | return -ENODEV; | |
187 | ||
188 | irq = platform_get_irq(pdev, 0); | |
189 | if (irq < 0) { | |
190 | retval = irq; | |
191 | goto fail_irq_get; | |
192 | } | |
193 | ||
56fafb94 SR |
194 | /* |
195 | * Right now device-tree probed devices don't get dma_mask set. | |
196 | * Since shared usb code relies on it, set it here for now. | |
197 | * Once we have dma capability bindings this can go away. | |
198 | */ | |
199 | if (!pdev->dev.dma_mask) | |
200 | pdev->dev.dma_mask = &spear_ehci_dma_mask; | |
201 | ||
202 | /* | |
203 | * Increment the device instance, when probing via device-tree | |
204 | */ | |
205 | if (pdev->id < 0) | |
206 | instance++; | |
207 | else | |
208 | instance = pdev->id; | |
209 | sprintf(clk_name, "usbh.%01d_clk", instance); | |
c8c38de9 DS |
210 | |
211 | usbh_clk = clk_get(NULL, clk_name); | |
212 | if (IS_ERR(usbh_clk)) { | |
213 | dev_err(&pdev->dev, "Error getting interface clock\n"); | |
214 | retval = PTR_ERR(usbh_clk); | |
215 | goto fail_get_usbh_clk; | |
216 | } | |
217 | ||
218 | hcd = usb_create_hcd(driver, &pdev->dev, dev_name(&pdev->dev)); | |
219 | if (!hcd) { | |
220 | retval = -ENOMEM; | |
221 | goto fail_create_hcd; | |
222 | } | |
223 | ||
224 | res = platform_get_resource(pdev, IORESOURCE_MEM, 0); | |
225 | if (!res) { | |
226 | retval = -ENODEV; | |
227 | goto fail_request_resource; | |
228 | } | |
229 | ||
230 | hcd->rsrc_start = res->start; | |
231 | hcd->rsrc_len = resource_size(res); | |
232 | if (!request_mem_region(hcd->rsrc_start, hcd->rsrc_len, | |
233 | driver->description)) { | |
234 | retval = -EBUSY; | |
235 | goto fail_request_resource; | |
236 | } | |
237 | ||
238 | hcd->regs = ioremap(hcd->rsrc_start, hcd->rsrc_len); | |
239 | if (hcd->regs == NULL) { | |
240 | dev_dbg(&pdev->dev, "error mapping memory\n"); | |
241 | retval = -ENOMEM; | |
242 | goto fail_ioremap; | |
243 | } | |
244 | ||
245 | ehci = (struct spear_ehci *)hcd_to_ehci(hcd); | |
246 | ehci->clk = usbh_clk; | |
247 | ||
248 | spear_start_ehci(ehci); | |
b5dd18d8 | 249 | retval = usb_add_hcd(hcd, irq, IRQF_SHARED); |
c8c38de9 DS |
250 | if (retval) |
251 | goto fail_add_hcd; | |
252 | ||
253 | return retval; | |
254 | ||
255 | fail_add_hcd: | |
256 | spear_stop_ehci(ehci); | |
257 | iounmap(hcd->regs); | |
258 | fail_ioremap: | |
259 | release_mem_region(hcd->rsrc_start, hcd->rsrc_len); | |
260 | fail_request_resource: | |
261 | usb_put_hcd(hcd); | |
262 | fail_create_hcd: | |
263 | clk_put(usbh_clk); | |
264 | fail_get_usbh_clk: | |
265 | fail_irq_get: | |
266 | dev_err(&pdev->dev, "init fail, %d\n", retval); | |
267 | ||
268 | return retval ; | |
269 | } | |
270 | ||
271 | static int spear_ehci_hcd_drv_remove(struct platform_device *pdev) | |
272 | { | |
273 | struct usb_hcd *hcd = platform_get_drvdata(pdev); | |
274 | struct spear_ehci *ehci_p = to_spear_ehci(hcd); | |
275 | ||
276 | if (!hcd) | |
277 | return 0; | |
278 | if (in_interrupt()) | |
279 | BUG(); | |
280 | usb_remove_hcd(hcd); | |
281 | ||
282 | if (ehci_p->clk) | |
283 | spear_stop_ehci(ehci_p); | |
284 | iounmap(hcd->regs); | |
285 | release_mem_region(hcd->rsrc_start, hcd->rsrc_len); | |
286 | usb_put_hcd(hcd); | |
287 | ||
288 | if (ehci_p->clk) | |
289 | clk_put(ehci_p->clk); | |
290 | ||
291 | return 0; | |
292 | } | |
293 | ||
56fafb94 SR |
294 | static struct of_device_id spear_ehci_id_table[] __devinitdata = { |
295 | { .compatible = "st,spear600-ehci", }, | |
296 | { }, | |
297 | }; | |
298 | ||
c8c38de9 DS |
299 | static struct platform_driver spear_ehci_hcd_driver = { |
300 | .probe = spear_ehci_hcd_drv_probe, | |
301 | .remove = spear_ehci_hcd_drv_remove, | |
302 | .shutdown = usb_hcd_platform_shutdown, | |
303 | .driver = { | |
304 | .name = "spear-ehci", | |
8c1b3693 DS |
305 | .bus = &platform_bus_type, |
306 | .pm = &ehci_spear_pm_ops, | |
56fafb94 | 307 | .of_match_table = of_match_ptr(spear_ehci_id_table), |
c8c38de9 DS |
308 | } |
309 | }; | |
310 | ||
311 | MODULE_ALIAS("platform:spear-ehci"); |