Commit | Line | Data |
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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 | { | |
15c9d50b | 28 | clk_prepare_enable(ohci->clk); |
c8c38de9 DS |
29 | } |
30 | ||
31 | static void spear_stop_ohci(struct spear_ohci *ohci) | |
32 | { | |
15c9d50b | 33 | clk_disable_unprepare(ohci->clk); |
c8c38de9 DS |
34 | } |
35 | ||
41ac7b3a | 36 | static int ohci_spear_start(struct usb_hcd *hcd) |
c8c38de9 DS |
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 DS |
104 | |
105 | irq = platform_get_irq(pdev, 0); | |
106 | if (irq < 0) { | |
107 | retval = irq; | |
98515e59 | 108 | goto fail; |
c8c38de9 DS |
109 | } |
110 | ||
56fafb94 SR |
111 | /* |
112 | * Right now device-tree probed devices don't get dma_mask set. | |
113 | * Since shared usb code relies on it, set it here for now. | |
114 | * Once we have dma capability bindings this can go away. | |
115 | */ | |
116 | if (!pdev->dev.dma_mask) | |
117 | pdev->dev.dma_mask = &spear_ohci_dma_mask; | |
118 | ||
98515e59 | 119 | usbh_clk = devm_clk_get(&pdev->dev, NULL); |
c8c38de9 DS |
120 | if (IS_ERR(usbh_clk)) { |
121 | dev_err(&pdev->dev, "Error getting interface clock\n"); | |
122 | retval = PTR_ERR(usbh_clk); | |
98515e59 | 123 | goto fail; |
c8c38de9 DS |
124 | } |
125 | ||
126 | hcd = usb_create_hcd(driver, &pdev->dev, dev_name(&pdev->dev)); | |
127 | if (!hcd) { | |
128 | retval = -ENOMEM; | |
98515e59 | 129 | goto fail; |
c8c38de9 DS |
130 | } |
131 | ||
132 | res = platform_get_resource(pdev, IORESOURCE_MEM, 0); | |
133 | if (!res) { | |
134 | retval = -ENODEV; | |
98515e59 | 135 | goto err_put_hcd; |
c8c38de9 DS |
136 | } |
137 | ||
138 | hcd->rsrc_start = pdev->resource[0].start; | |
139 | hcd->rsrc_len = resource_size(res); | |
98515e59 VK |
140 | if (!devm_request_mem_region(&pdev->dev, hcd->rsrc_start, hcd->rsrc_len, |
141 | hcd_name)) { | |
c8c38de9 DS |
142 | dev_dbg(&pdev->dev, "request_mem_region failed\n"); |
143 | retval = -EBUSY; | |
98515e59 | 144 | goto err_put_hcd; |
c8c38de9 DS |
145 | } |
146 | ||
98515e59 | 147 | hcd->regs = devm_ioremap(&pdev->dev, hcd->rsrc_start, hcd->rsrc_len); |
c8c38de9 DS |
148 | if (!hcd->regs) { |
149 | dev_dbg(&pdev->dev, "ioremap failed\n"); | |
150 | retval = -ENOMEM; | |
98515e59 | 151 | goto err_put_hcd; |
c8c38de9 DS |
152 | } |
153 | ||
154 | ohci_p = (struct spear_ohci *)hcd_to_ohci(hcd); | |
155 | ohci_p->clk = usbh_clk; | |
156 | spear_start_ohci(ohci_p); | |
157 | ohci_hcd_init(hcd_to_ohci(hcd)); | |
158 | ||
b5dd18d8 | 159 | retval = usb_add_hcd(hcd, platform_get_irq(pdev, 0), 0); |
c8c38de9 DS |
160 | if (retval == 0) |
161 | return retval; | |
162 | ||
163 | spear_stop_ohci(ohci_p); | |
98515e59 | 164 | err_put_hcd: |
c8c38de9 | 165 | usb_put_hcd(hcd); |
98515e59 | 166 | fail: |
c8c38de9 DS |
167 | dev_err(&pdev->dev, "init fail, %d\n", retval); |
168 | ||
169 | return retval; | |
170 | } | |
171 | ||
172 | static int spear_ohci_hcd_drv_remove(struct platform_device *pdev) | |
173 | { | |
174 | struct usb_hcd *hcd = platform_get_drvdata(pdev); | |
175 | struct spear_ohci *ohci_p = to_spear_ohci(hcd); | |
176 | ||
177 | usb_remove_hcd(hcd); | |
178 | if (ohci_p->clk) | |
179 | spear_stop_ohci(ohci_p); | |
180 | ||
c8c38de9 DS |
181 | usb_put_hcd(hcd); |
182 | ||
c8c38de9 DS |
183 | platform_set_drvdata(pdev, NULL); |
184 | return 0; | |
185 | } | |
186 | ||
187 | #if defined(CONFIG_PM) | |
188 | static int spear_ohci_hcd_drv_suspend(struct platform_device *dev, | |
189 | pm_message_t message) | |
190 | { | |
191 | struct usb_hcd *hcd = platform_get_drvdata(dev); | |
192 | struct ohci_hcd *ohci = hcd_to_ohci(hcd); | |
193 | struct spear_ohci *ohci_p = to_spear_ohci(hcd); | |
194 | ||
195 | if (time_before(jiffies, ohci->next_statechange)) | |
196 | msleep(5); | |
197 | ohci->next_statechange = jiffies; | |
198 | ||
199 | spear_stop_ohci(ohci_p); | |
c8c38de9 DS |
200 | return 0; |
201 | } | |
202 | ||
203 | static int spear_ohci_hcd_drv_resume(struct platform_device *dev) | |
204 | { | |
205 | struct usb_hcd *hcd = platform_get_drvdata(dev); | |
206 | struct ohci_hcd *ohci = hcd_to_ohci(hcd); | |
207 | struct spear_ohci *ohci_p = to_spear_ohci(hcd); | |
208 | ||
209 | if (time_before(jiffies, ohci->next_statechange)) | |
210 | msleep(5); | |
211 | ohci->next_statechange = jiffies; | |
212 | ||
213 | spear_start_ohci(ohci_p); | |
cfa49b4b | 214 | ohci_resume(hcd, false); |
c8c38de9 DS |
215 | return 0; |
216 | } | |
217 | #endif | |
218 | ||
d3608b6d | 219 | static struct of_device_id spear_ohci_id_table[] = { |
56fafb94 SR |
220 | { .compatible = "st,spear600-ohci", }, |
221 | { }, | |
222 | }; | |
223 | ||
c8c38de9 DS |
224 | /* Driver definition to register with the platform bus */ |
225 | static struct platform_driver spear_ohci_hcd_driver = { | |
226 | .probe = spear_ohci_hcd_drv_probe, | |
227 | .remove = spear_ohci_hcd_drv_remove, | |
228 | #ifdef CONFIG_PM | |
229 | .suspend = spear_ohci_hcd_drv_suspend, | |
230 | .resume = spear_ohci_hcd_drv_resume, | |
231 | #endif | |
232 | .driver = { | |
233 | .owner = THIS_MODULE, | |
234 | .name = "spear-ohci", | |
56fafb94 | 235 | .of_match_table = of_match_ptr(spear_ohci_id_table), |
c8c38de9 DS |
236 | }, |
237 | }; | |
238 | ||
239 | MODULE_ALIAS("platform:spear-ohci"); |