Commit | Line | Data |
---|---|---|
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 | { | |
15c9d50b | 29 | clk_prepare_enable(ehci->clk); |
c8c38de9 DS |
30 | } |
31 | ||
32 | static void spear_stop_ehci(struct spear_ehci *ehci) | |
33 | { | |
15c9d50b | 34 | clk_disable_unprepare(ehci->clk); |
c8c38de9 DS |
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; | |
c8c38de9 | 44 | |
1a49e2ac | 45 | retval = ehci_setup(hcd); |
c8c38de9 DS |
46 | if (retval) |
47 | return retval; | |
48 | ||
c8c38de9 DS |
49 | ehci_port_power(ehci, 0); |
50 | ||
51 | return retval; | |
52 | } | |
53 | ||
54 | static const struct hc_driver ehci_spear_hc_driver = { | |
55 | .description = hcd_name, | |
56 | .product_desc = "SPEAr EHCI", | |
57 | .hcd_priv_size = sizeof(struct spear_ehci), | |
58 | ||
59 | /* generic hardware linkage */ | |
60 | .irq = ehci_irq, | |
61 | .flags = HCD_MEMORY | HCD_USB2, | |
62 | ||
63 | /* basic lifecycle operations */ | |
64 | .reset = ehci_spear_setup, | |
65 | .start = ehci_run, | |
66 | .stop = ehci_stop, | |
67 | .shutdown = ehci_shutdown, | |
68 | ||
69 | /* managing i/o requests and associated device resources */ | |
70 | .urb_enqueue = ehci_urb_enqueue, | |
71 | .urb_dequeue = ehci_urb_dequeue, | |
72 | .endpoint_disable = ehci_endpoint_disable, | |
73 | .endpoint_reset = ehci_endpoint_reset, | |
74 | ||
75 | /* scheduling support */ | |
76 | .get_frame_number = ehci_get_frame, | |
77 | ||
78 | /* root hub support */ | |
79 | .hub_status_data = ehci_hub_status_data, | |
80 | .hub_control = ehci_hub_control, | |
81 | .bus_suspend = ehci_bus_suspend, | |
82 | .bus_resume = ehci_bus_resume, | |
83 | .relinquish_port = ehci_relinquish_port, | |
84 | .port_handed_over = ehci_port_handed_over, | |
85 | .clear_tt_buffer_complete = ehci_clear_tt_buffer_complete, | |
86 | }; | |
87 | ||
8c1b3693 DS |
88 | #ifdef CONFIG_PM |
89 | static int ehci_spear_drv_suspend(struct device *dev) | |
90 | { | |
91 | struct usb_hcd *hcd = dev_get_drvdata(dev); | |
c5cf9212 AS |
92 | bool do_wakeup = device_may_wakeup(dev); |
93 | ||
94 | return ehci_suspend(hcd, do_wakeup); | |
8c1b3693 DS |
95 | } |
96 | ||
97 | static int ehci_spear_drv_resume(struct device *dev) | |
98 | { | |
99 | struct usb_hcd *hcd = dev_get_drvdata(dev); | |
8c1b3693 | 100 | |
c5cf9212 | 101 | ehci_resume(hcd, false); |
8c1b3693 DS |
102 | return 0; |
103 | } | |
104 | #endif /* CONFIG_PM */ | |
105 | ||
106 | static SIMPLE_DEV_PM_OPS(ehci_spear_pm_ops, ehci_spear_drv_suspend, | |
107 | ehci_spear_drv_resume); | |
108 | ||
56fafb94 SR |
109 | static u64 spear_ehci_dma_mask = DMA_BIT_MASK(32); |
110 | ||
c8c38de9 DS |
111 | static int spear_ehci_hcd_drv_probe(struct platform_device *pdev) |
112 | { | |
113 | struct usb_hcd *hcd ; | |
114 | struct spear_ehci *ehci; | |
115 | struct resource *res; | |
116 | struct clk *usbh_clk; | |
117 | const struct hc_driver *driver = &ehci_spear_hc_driver; | |
c8c38de9 DS |
118 | int irq, retval; |
119 | char clk_name[20] = "usbh_clk"; | |
56fafb94 | 120 | static int instance = -1; |
c8c38de9 DS |
121 | |
122 | if (usb_disabled()) | |
123 | return -ENODEV; | |
124 | ||
125 | irq = platform_get_irq(pdev, 0); | |
126 | if (irq < 0) { | |
127 | retval = irq; | |
128 | goto fail_irq_get; | |
129 | } | |
130 | ||
56fafb94 SR |
131 | /* |
132 | * Right now device-tree probed devices don't get dma_mask set. | |
133 | * Since shared usb code relies on it, set it here for now. | |
134 | * Once we have dma capability bindings this can go away. | |
135 | */ | |
136 | if (!pdev->dev.dma_mask) | |
137 | pdev->dev.dma_mask = &spear_ehci_dma_mask; | |
138 | ||
139 | /* | |
140 | * Increment the device instance, when probing via device-tree | |
141 | */ | |
142 | if (pdev->id < 0) | |
143 | instance++; | |
144 | else | |
145 | instance = pdev->id; | |
146 | sprintf(clk_name, "usbh.%01d_clk", instance); | |
c8c38de9 DS |
147 | |
148 | usbh_clk = clk_get(NULL, clk_name); | |
149 | if (IS_ERR(usbh_clk)) { | |
150 | dev_err(&pdev->dev, "Error getting interface clock\n"); | |
151 | retval = PTR_ERR(usbh_clk); | |
152 | goto fail_get_usbh_clk; | |
153 | } | |
154 | ||
155 | hcd = usb_create_hcd(driver, &pdev->dev, dev_name(&pdev->dev)); | |
156 | if (!hcd) { | |
157 | retval = -ENOMEM; | |
158 | goto fail_create_hcd; | |
159 | } | |
160 | ||
161 | res = platform_get_resource(pdev, IORESOURCE_MEM, 0); | |
162 | if (!res) { | |
163 | retval = -ENODEV; | |
164 | goto fail_request_resource; | |
165 | } | |
166 | ||
167 | hcd->rsrc_start = res->start; | |
168 | hcd->rsrc_len = resource_size(res); | |
169 | if (!request_mem_region(hcd->rsrc_start, hcd->rsrc_len, | |
170 | driver->description)) { | |
171 | retval = -EBUSY; | |
172 | goto fail_request_resource; | |
173 | } | |
174 | ||
175 | hcd->regs = ioremap(hcd->rsrc_start, hcd->rsrc_len); | |
176 | if (hcd->regs == NULL) { | |
177 | dev_dbg(&pdev->dev, "error mapping memory\n"); | |
178 | retval = -ENOMEM; | |
179 | goto fail_ioremap; | |
180 | } | |
181 | ||
182 | ehci = (struct spear_ehci *)hcd_to_ehci(hcd); | |
183 | ehci->clk = usbh_clk; | |
184 | ||
185 | spear_start_ehci(ehci); | |
b5dd18d8 | 186 | retval = usb_add_hcd(hcd, irq, IRQF_SHARED); |
c8c38de9 DS |
187 | if (retval) |
188 | goto fail_add_hcd; | |
189 | ||
190 | return retval; | |
191 | ||
192 | fail_add_hcd: | |
193 | spear_stop_ehci(ehci); | |
194 | iounmap(hcd->regs); | |
195 | fail_ioremap: | |
196 | release_mem_region(hcd->rsrc_start, hcd->rsrc_len); | |
197 | fail_request_resource: | |
198 | usb_put_hcd(hcd); | |
199 | fail_create_hcd: | |
200 | clk_put(usbh_clk); | |
201 | fail_get_usbh_clk: | |
202 | fail_irq_get: | |
203 | dev_err(&pdev->dev, "init fail, %d\n", retval); | |
204 | ||
205 | return retval ; | |
206 | } | |
207 | ||
208 | static int spear_ehci_hcd_drv_remove(struct platform_device *pdev) | |
209 | { | |
210 | struct usb_hcd *hcd = platform_get_drvdata(pdev); | |
211 | struct spear_ehci *ehci_p = to_spear_ehci(hcd); | |
212 | ||
213 | if (!hcd) | |
214 | return 0; | |
215 | if (in_interrupt()) | |
216 | BUG(); | |
217 | usb_remove_hcd(hcd); | |
218 | ||
219 | if (ehci_p->clk) | |
220 | spear_stop_ehci(ehci_p); | |
221 | iounmap(hcd->regs); | |
222 | release_mem_region(hcd->rsrc_start, hcd->rsrc_len); | |
223 | usb_put_hcd(hcd); | |
224 | ||
225 | if (ehci_p->clk) | |
226 | clk_put(ehci_p->clk); | |
227 | ||
228 | return 0; | |
229 | } | |
230 | ||
56fafb94 SR |
231 | static struct of_device_id spear_ehci_id_table[] __devinitdata = { |
232 | { .compatible = "st,spear600-ehci", }, | |
233 | { }, | |
234 | }; | |
235 | ||
c8c38de9 DS |
236 | static struct platform_driver spear_ehci_hcd_driver = { |
237 | .probe = spear_ehci_hcd_drv_probe, | |
238 | .remove = spear_ehci_hcd_drv_remove, | |
239 | .shutdown = usb_hcd_platform_shutdown, | |
240 | .driver = { | |
241 | .name = "spear-ehci", | |
8c1b3693 DS |
242 | .bus = &platform_bus_type, |
243 | .pm = &ehci_spear_pm_ops, | |
56fafb94 | 244 | .of_match_table = of_match_ptr(spear_ehci_id_table), |
c8c38de9 DS |
245 | } |
246 | }; | |
247 | ||
248 | MODULE_ALIAS("platform:spear-ehci"); |