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62194244 JH |
1 | /* |
2 | * SAMSUNG EXYNOS USB HOST OHCI Controller | |
3 | * | |
4 | * Copyright (C) 2011 Samsung Electronics Co.Ltd | |
5 | * Author: Jingoo Han <jg1.han@samsung.com> | |
6 | * | |
7 | * This program is free software; you can redistribute it and/or modify it | |
8 | * under the terms of the GNU General Public License as published by the | |
9 | * Free Software Foundation; either version 2 of the License, or (at your | |
10 | * option) any later version. | |
11 | * | |
12 | */ | |
13 | ||
14 | #include <linux/clk.h> | |
50a97e05 MG |
15 | #include <linux/dma-mapping.h> |
16 | #include <linux/io.h> | |
17 | #include <linux/kernel.h> | |
18 | #include <linux/module.h> | |
d5138930 | 19 | #include <linux/of.h> |
62194244 | 20 | #include <linux/platform_device.h> |
7d28e54b | 21 | #include <linux/phy/phy.h> |
50a97e05 MG |
22 | #include <linux/usb.h> |
23 | #include <linux/usb/hcd.h> | |
50a97e05 MG |
24 | |
25 | #include "ohci.h" | |
26 | ||
27 | #define DRIVER_DESC "OHCI EXYNOS driver" | |
28 | ||
29 | static const char hcd_name[] = "ohci-exynos"; | |
30 | static struct hc_driver __read_mostly exynos_ohci_hc_driver; | |
31 | ||
32 | #define to_exynos_ohci(hcd) (struct exynos_ohci_hcd *)(hcd_to_ohci(hcd)->priv) | |
62194244 | 33 | |
7d28e54b VG |
34 | #define PHY_NUMBER 3 |
35 | ||
62194244 | 36 | struct exynos_ohci_hcd { |
62194244 | 37 | struct clk *clk; |
2db94162 | 38 | struct phy *phy[PHY_NUMBER]; |
62194244 JH |
39 | }; |
40 | ||
7d28e54b VG |
41 | static int exynos_ohci_get_phy(struct device *dev, |
42 | struct exynos_ohci_hcd *exynos_ohci) | |
43 | { | |
44 | struct device_node *child; | |
45 | struct phy *phy; | |
46 | int phy_number; | |
2db94162 | 47 | int ret; |
7d28e54b | 48 | |
2db94162 | 49 | /* Get PHYs for the controller */ |
7d28e54b VG |
50 | for_each_available_child_of_node(dev->of_node, child) { |
51 | ret = of_property_read_u32(child, "reg", &phy_number); | |
52 | if (ret) { | |
53 | dev_err(dev, "Failed to parse device tree\n"); | |
54 | of_node_put(child); | |
55 | return ret; | |
56 | } | |
57 | ||
58 | if (phy_number >= PHY_NUMBER) { | |
59 | dev_err(dev, "Invalid number of PHYs\n"); | |
60 | of_node_put(child); | |
61 | return -EINVAL; | |
62 | } | |
63 | ||
473e92e6 | 64 | phy = devm_of_phy_get(dev, child, NULL); |
2db94162 | 65 | exynos_ohci->phy[phy_number] = phy; |
2db94162 VG |
66 | if (IS_ERR(phy)) { |
67 | ret = PTR_ERR(phy); | |
68 | if (ret == -EPROBE_DEFER) { | |
55b0164a | 69 | of_node_put(child); |
2db94162 VG |
70 | return ret; |
71 | } else if (ret != -ENOSYS && ret != -ENODEV) { | |
72 | dev_err(dev, | |
73 | "Error retrieving usb2 phy: %d\n", ret); | |
55b0164a | 74 | of_node_put(child); |
2db94162 VG |
75 | return ret; |
76 | } | |
2f7f41c7 | 77 | } |
7d28e54b VG |
78 | } |
79 | ||
2db94162 | 80 | return 0; |
7d28e54b VG |
81 | } |
82 | ||
83 | static int exynos_ohci_phy_enable(struct device *dev) | |
ed993bf1 | 84 | { |
54969ed6 | 85 | struct usb_hcd *hcd = dev_get_drvdata(dev); |
50a97e05 | 86 | struct exynos_ohci_hcd *exynos_ohci = to_exynos_ohci(hcd); |
7d28e54b VG |
87 | int i; |
88 | int ret = 0; | |
89 | ||
7d28e54b | 90 | for (i = 0; ret == 0 && i < PHY_NUMBER; i++) |
2db94162 VG |
91 | if (!IS_ERR(exynos_ohci->phy[i])) |
92 | ret = phy_power_on(exynos_ohci->phy[i]); | |
7d28e54b VG |
93 | if (ret) |
94 | for (i--; i >= 0; i--) | |
2db94162 VG |
95 | if (!IS_ERR(exynos_ohci->phy[i])) |
96 | phy_power_off(exynos_ohci->phy[i]); | |
7d28e54b VG |
97 | |
98 | return ret; | |
ed993bf1 VG |
99 | } |
100 | ||
54969ed6 | 101 | static void exynos_ohci_phy_disable(struct device *dev) |
ed993bf1 | 102 | { |
54969ed6 | 103 | struct usb_hcd *hcd = dev_get_drvdata(dev); |
50a97e05 | 104 | struct exynos_ohci_hcd *exynos_ohci = to_exynos_ohci(hcd); |
7d28e54b | 105 | int i; |
ed993bf1 | 106 | |
7d28e54b | 107 | for (i = 0; i < PHY_NUMBER; i++) |
2db94162 VG |
108 | if (!IS_ERR(exynos_ohci->phy[i])) |
109 | phy_power_off(exynos_ohci->phy[i]); | |
ed993bf1 VG |
110 | } |
111 | ||
41ac7b3a | 112 | static int exynos_ohci_probe(struct platform_device *pdev) |
62194244 | 113 | { |
62194244 JH |
114 | struct exynos_ohci_hcd *exynos_ohci; |
115 | struct usb_hcd *hcd; | |
62194244 JH |
116 | struct resource *res; |
117 | int irq; | |
118 | int err; | |
119 | ||
d5138930 VG |
120 | /* |
121 | * Right now device-tree probed devices don't get dma_mask set. | |
122 | * Since shared usb code relies on it, set it here for now. | |
123 | * Once we move to full device tree support this will vanish off. | |
124 | */ | |
e1fd7341 | 125 | err = dma_coerce_mask_and_coherent(&pdev->dev, DMA_BIT_MASK(32)); |
22d9d8e8 RK |
126 | if (err) |
127 | return err; | |
d5138930 | 128 | |
50a97e05 MG |
129 | hcd = usb_create_hcd(&exynos_ohci_hc_driver, |
130 | &pdev->dev, dev_name(&pdev->dev)); | |
131 | if (!hcd) { | |
132 | dev_err(&pdev->dev, "Unable to create HCD\n"); | |
62194244 | 133 | return -ENOMEM; |
50a97e05 MG |
134 | } |
135 | ||
136 | exynos_ohci = to_exynos_ohci(hcd); | |
62194244 | 137 | |
2871782a TA |
138 | if (of_device_is_compatible(pdev->dev.of_node, |
139 | "samsung,exynos5440-ohci")) | |
140 | goto skip_phy; | |
141 | ||
7d28e54b VG |
142 | err = exynos_ohci_get_phy(&pdev->dev, exynos_ohci); |
143 | if (err) | |
144 | goto fail_clk; | |
ed993bf1 | 145 | |
2871782a | 146 | skip_phy: |
60d80adb | 147 | exynos_ohci->clk = devm_clk_get(&pdev->dev, "usbhost"); |
62194244 JH |
148 | |
149 | if (IS_ERR(exynos_ohci->clk)) { | |
150 | dev_err(&pdev->dev, "Failed to get usbhost clock\n"); | |
151 | err = PTR_ERR(exynos_ohci->clk); | |
152 | goto fail_clk; | |
153 | } | |
154 | ||
c05c946c | 155 | err = clk_prepare_enable(exynos_ohci->clk); |
62194244 | 156 | if (err) |
60d80adb | 157 | goto fail_clk; |
62194244 JH |
158 | |
159 | res = platform_get_resource(pdev, IORESOURCE_MEM, 0); | |
bae00c1a VG |
160 | hcd->regs = devm_ioremap_resource(&pdev->dev, res); |
161 | if (IS_ERR(hcd->regs)) { | |
162 | err = PTR_ERR(hcd->regs); | |
62194244 JH |
163 | goto fail_io; |
164 | } | |
b87a9c52 VB |
165 | hcd->rsrc_start = res->start; |
166 | hcd->rsrc_len = resource_size(res); | |
62194244 JH |
167 | |
168 | irq = platform_get_irq(pdev, 0); | |
169 | if (!irq) { | |
170 | dev_err(&pdev->dev, "Failed to get IRQ\n"); | |
171 | err = -ENODEV; | |
390a0a78 | 172 | goto fail_io; |
62194244 JH |
173 | } |
174 | ||
50a97e05 | 175 | platform_set_drvdata(pdev, hcd); |
62194244 | 176 | |
7d28e54b VG |
177 | err = exynos_ohci_phy_enable(&pdev->dev); |
178 | if (err) { | |
179 | dev_err(&pdev->dev, "Failed to enable USB phy\n"); | |
180 | goto fail_io; | |
181 | } | |
62194244 JH |
182 | |
183 | err = usb_add_hcd(hcd, irq, IRQF_SHARED); | |
184 | if (err) { | |
185 | dev_err(&pdev->dev, "Failed to add USB HCD\n"); | |
ed993bf1 | 186 | goto fail_add_hcd; |
62194244 | 187 | } |
3c9740a1 | 188 | device_wakeup_enable(hcd->self.controller); |
62194244 JH |
189 | return 0; |
190 | ||
ed993bf1 | 191 | fail_add_hcd: |
54969ed6 | 192 | exynos_ohci_phy_disable(&pdev->dev); |
62194244 | 193 | fail_io: |
c05c946c | 194 | clk_disable_unprepare(exynos_ohci->clk); |
62194244 JH |
195 | fail_clk: |
196 | usb_put_hcd(hcd); | |
62194244 JH |
197 | return err; |
198 | } | |
199 | ||
fb4e98ab | 200 | static int exynos_ohci_remove(struct platform_device *pdev) |
62194244 | 201 | { |
50a97e05 MG |
202 | struct usb_hcd *hcd = platform_get_drvdata(pdev); |
203 | struct exynos_ohci_hcd *exynos_ohci = to_exynos_ohci(hcd); | |
62194244 JH |
204 | |
205 | usb_remove_hcd(hcd); | |
206 | ||
54969ed6 | 207 | exynos_ohci_phy_disable(&pdev->dev); |
62194244 | 208 | |
c05c946c | 209 | clk_disable_unprepare(exynos_ohci->clk); |
62194244 JH |
210 | |
211 | usb_put_hcd(hcd); | |
62194244 JH |
212 | |
213 | return 0; | |
214 | } | |
215 | ||
216 | static void exynos_ohci_shutdown(struct platform_device *pdev) | |
217 | { | |
50a97e05 | 218 | struct usb_hcd *hcd = platform_get_drvdata(pdev); |
62194244 JH |
219 | |
220 | if (hcd->driver->shutdown) | |
221 | hcd->driver->shutdown(hcd); | |
222 | } | |
223 | ||
224 | #ifdef CONFIG_PM | |
225 | static int exynos_ohci_suspend(struct device *dev) | |
226 | { | |
50a97e05 MG |
227 | struct usb_hcd *hcd = dev_get_drvdata(dev); |
228 | struct exynos_ohci_hcd *exynos_ohci = to_exynos_ohci(hcd); | |
14982e31 | 229 | bool do_wakeup = device_may_wakeup(dev); |
14982e31 | 230 | int rc = ohci_suspend(hcd, do_wakeup); |
62194244 | 231 | |
14982e31 MG |
232 | if (rc) |
233 | return rc; | |
066ba8e0 | 234 | |
54969ed6 | 235 | exynos_ohci_phy_disable(dev); |
e864abed | 236 | |
c05c946c | 237 | clk_disable_unprepare(exynos_ohci->clk); |
e864abed | 238 | |
14982e31 | 239 | return 0; |
62194244 JH |
240 | } |
241 | ||
242 | static int exynos_ohci_resume(struct device *dev) | |
243 | { | |
50a97e05 MG |
244 | struct usb_hcd *hcd = dev_get_drvdata(dev); |
245 | struct exynos_ohci_hcd *exynos_ohci = to_exynos_ohci(hcd); | |
7d28e54b | 246 | int ret; |
62194244 | 247 | |
c05c946c | 248 | clk_prepare_enable(exynos_ohci->clk); |
e864abed | 249 | |
7d28e54b VG |
250 | ret = exynos_ohci_phy_enable(dev); |
251 | if (ret) { | |
252 | dev_err(dev, "Failed to enable USB phy\n"); | |
253 | clk_disable_unprepare(exynos_ohci->clk); | |
254 | return ret; | |
255 | } | |
62194244 | 256 | |
cfa49b4b | 257 | ohci_resume(hcd, false); |
62194244 JH |
258 | |
259 | return 0; | |
260 | } | |
261 | #else | |
262 | #define exynos_ohci_suspend NULL | |
263 | #define exynos_ohci_resume NULL | |
264 | #endif | |
265 | ||
50a97e05 MG |
266 | static const struct ohci_driver_overrides exynos_overrides __initconst = { |
267 | .extra_priv_size = sizeof(struct exynos_ohci_hcd), | |
268 | }; | |
269 | ||
62194244 JH |
270 | static const struct dev_pm_ops exynos_ohci_pm_ops = { |
271 | .suspend = exynos_ohci_suspend, | |
272 | .resume = exynos_ohci_resume, | |
273 | }; | |
274 | ||
d5138930 VG |
275 | #ifdef CONFIG_OF |
276 | static const struct of_device_id exynos_ohci_match[] = { | |
6e247777 | 277 | { .compatible = "samsung,exynos4210-ohci" }, |
2871782a | 278 | { .compatible = "samsung,exynos5440-ohci" }, |
d5138930 VG |
279 | {}, |
280 | }; | |
281 | MODULE_DEVICE_TABLE(of, exynos_ohci_match); | |
282 | #endif | |
283 | ||
62194244 JH |
284 | static struct platform_driver exynos_ohci_driver = { |
285 | .probe = exynos_ohci_probe, | |
7690417d | 286 | .remove = exynos_ohci_remove, |
62194244 JH |
287 | .shutdown = exynos_ohci_shutdown, |
288 | .driver = { | |
289 | .name = "exynos-ohci", | |
62194244 | 290 | .pm = &exynos_ohci_pm_ops, |
d5138930 | 291 | .of_match_table = of_match_ptr(exynos_ohci_match), |
62194244 JH |
292 | } |
293 | }; | |
50a97e05 MG |
294 | static int __init ohci_exynos_init(void) |
295 | { | |
296 | if (usb_disabled()) | |
297 | return -ENODEV; | |
298 | ||
299 | pr_info("%s: " DRIVER_DESC "\n", hcd_name); | |
300 | ohci_init_driver(&exynos_ohci_hc_driver, &exynos_overrides); | |
301 | return platform_driver_register(&exynos_ohci_driver); | |
302 | } | |
303 | module_init(ohci_exynos_init); | |
304 | ||
305 | static void __exit ohci_exynos_cleanup(void) | |
306 | { | |
307 | platform_driver_unregister(&exynos_ohci_driver); | |
308 | } | |
309 | module_exit(ohci_exynos_cleanup); | |
62194244 JH |
310 | |
311 | MODULE_ALIAS("platform:exynos-ohci"); | |
312 | MODULE_AUTHOR("Jingoo Han <jg1.han@samsung.com>"); | |
50a97e05 | 313 | MODULE_LICENSE("GPL v2"); |