Merge branch 'sched/urgent' into sched/core, to pick up fixes
[cascardo/linux.git] / drivers / usb / host / xhci-plat.c
1 /*
2  * xhci-plat.c - xHCI host controller driver platform Bus Glue.
3  *
4  * Copyright (C) 2012 Texas Instruments Incorporated - http://www.ti.com
5  * Author: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
6  *
7  * A lot of code borrowed from the Linux xHCI driver.
8  *
9  * This program is free software; you can redistribute it and/or
10  * modify it under the terms of the GNU General Public License
11  * version 2 as published by the Free Software Foundation.
12  */
13
14 #include <linux/clk.h>
15 #include <linux/dma-mapping.h>
16 #include <linux/module.h>
17 #include <linux/of.h>
18 #include <linux/platform_device.h>
19 #include <linux/usb/phy.h>
20 #include <linux/slab.h>
21 #include <linux/usb/xhci_pdriver.h>
22 #include <linux/acpi.h>
23
24 #include "xhci.h"
25 #include "xhci-plat.h"
26 #include "xhci-mvebu.h"
27 #include "xhci-rcar.h"
28
29 static struct hc_driver __read_mostly xhci_plat_hc_driver;
30
31 static int xhci_plat_setup(struct usb_hcd *hcd);
32 static int xhci_plat_start(struct usb_hcd *hcd);
33
34 static const struct xhci_driver_overrides xhci_plat_overrides __initconst = {
35         .extra_priv_size = sizeof(struct xhci_plat_priv),
36         .reset = xhci_plat_setup,
37         .start = xhci_plat_start,
38 };
39
40 static void xhci_priv_plat_start(struct usb_hcd *hcd)
41 {
42         struct xhci_plat_priv *priv = hcd_to_xhci_priv(hcd);
43
44         if (priv->plat_start)
45                 priv->plat_start(hcd);
46 }
47
48 static int xhci_priv_init_quirk(struct usb_hcd *hcd)
49 {
50         struct xhci_plat_priv *priv = hcd_to_xhci_priv(hcd);
51
52         if (!priv->init_quirk)
53                 return 0;
54
55         return priv->init_quirk(hcd);
56 }
57
58 static void xhci_plat_quirks(struct device *dev, struct xhci_hcd *xhci)
59 {
60         /*
61          * As of now platform drivers don't provide MSI support so we ensure
62          * here that the generic code does not try to make a pci_dev from our
63          * dev struct in order to setup MSI
64          */
65         xhci->quirks |= XHCI_PLAT;
66 }
67
68 /* called during probe() after chip reset completes */
69 static int xhci_plat_setup(struct usb_hcd *hcd)
70 {
71         int ret;
72
73
74         ret = xhci_priv_init_quirk(hcd);
75         if (ret)
76                 return ret;
77
78         return xhci_gen_setup(hcd, xhci_plat_quirks);
79 }
80
81 static int xhci_plat_start(struct usb_hcd *hcd)
82 {
83         xhci_priv_plat_start(hcd);
84         return xhci_run(hcd);
85 }
86
87 #ifdef CONFIG_OF
88 static const struct xhci_plat_priv xhci_plat_marvell_armada = {
89         .init_quirk = xhci_mvebu_mbus_init_quirk,
90 };
91
92 static const struct xhci_plat_priv xhci_plat_renesas_rcar_gen2 = {
93         .firmware_name = XHCI_RCAR_FIRMWARE_NAME_V1,
94         .init_quirk = xhci_rcar_init_quirk,
95         .plat_start = xhci_rcar_start,
96 };
97
98 static const struct xhci_plat_priv xhci_plat_renesas_rcar_gen3 = {
99         .firmware_name = XHCI_RCAR_FIRMWARE_NAME_V2,
100         .init_quirk = xhci_rcar_init_quirk,
101         .plat_start = xhci_rcar_start,
102 };
103
104 static const struct of_device_id usb_xhci_of_match[] = {
105         {
106                 .compatible = "generic-xhci",
107         }, {
108                 .compatible = "xhci-platform",
109         }, {
110                 .compatible = "marvell,armada-375-xhci",
111                 .data = &xhci_plat_marvell_armada,
112         }, {
113                 .compatible = "marvell,armada-380-xhci",
114                 .data = &xhci_plat_marvell_armada,
115         }, {
116                 .compatible = "renesas,xhci-r8a7790",
117                 .data = &xhci_plat_renesas_rcar_gen2,
118         }, {
119                 .compatible = "renesas,xhci-r8a7791",
120                 .data = &xhci_plat_renesas_rcar_gen2,
121         }, {
122                 .compatible = "renesas,xhci-r8a7793",
123                 .data = &xhci_plat_renesas_rcar_gen2,
124         }, {
125                 .compatible = "renesas,xhci-r8a7795",
126                 .data = &xhci_plat_renesas_rcar_gen3,
127         }, {
128                 .compatible = "renesas,rcar-gen2-xhci",
129                 .data = &xhci_plat_renesas_rcar_gen2,
130         }, {
131                 .compatible = "renesas,rcar-gen3-xhci",
132                 .data = &xhci_plat_renesas_rcar_gen3,
133         },
134         {},
135 };
136 MODULE_DEVICE_TABLE(of, usb_xhci_of_match);
137 #endif
138
139 static int xhci_plat_probe(struct platform_device *pdev)
140 {
141         struct device_node      *node = pdev->dev.of_node;
142         struct usb_xhci_pdata   *pdata = dev_get_platdata(&pdev->dev);
143         const struct of_device_id *match;
144         const struct hc_driver  *driver;
145         struct xhci_hcd         *xhci;
146         struct resource         *res;
147         struct usb_hcd          *hcd;
148         struct clk              *clk;
149         int                     ret;
150         int                     irq;
151
152         if (usb_disabled())
153                 return -ENODEV;
154
155         driver = &xhci_plat_hc_driver;
156
157         irq = platform_get_irq(pdev, 0);
158         if (irq < 0)
159                 return -ENODEV;
160
161         /* Try to set 64-bit DMA first */
162         if (WARN_ON(!pdev->dev.dma_mask))
163                 /* Platform did not initialize dma_mask */
164                 ret = dma_coerce_mask_and_coherent(&pdev->dev,
165                                                    DMA_BIT_MASK(64));
166         else
167                 ret = dma_set_mask_and_coherent(&pdev->dev, DMA_BIT_MASK(64));
168
169         /* If seting 64-bit DMA mask fails, fall back to 32-bit DMA mask */
170         if (ret) {
171                 ret = dma_set_mask_and_coherent(&pdev->dev, DMA_BIT_MASK(32));
172                 if (ret)
173                         return ret;
174         }
175
176         hcd = usb_create_hcd(driver, &pdev->dev, dev_name(&pdev->dev));
177         if (!hcd)
178                 return -ENOMEM;
179
180         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
181         hcd->regs = devm_ioremap_resource(&pdev->dev, res);
182         if (IS_ERR(hcd->regs)) {
183                 ret = PTR_ERR(hcd->regs);
184                 goto put_hcd;
185         }
186
187         hcd->rsrc_start = res->start;
188         hcd->rsrc_len = resource_size(res);
189
190         /*
191          * Not all platforms have a clk so it is not an error if the
192          * clock does not exists.
193          */
194         clk = devm_clk_get(&pdev->dev, NULL);
195         if (!IS_ERR(clk)) {
196                 ret = clk_prepare_enable(clk);
197                 if (ret)
198                         goto put_hcd;
199         } else if (PTR_ERR(clk) == -EPROBE_DEFER) {
200                 ret = -EPROBE_DEFER;
201                 goto put_hcd;
202         }
203
204         xhci = hcd_to_xhci(hcd);
205         match = of_match_node(usb_xhci_of_match, node);
206         if (match) {
207                 const struct xhci_plat_priv *priv_match = match->data;
208                 struct xhci_plat_priv *priv = hcd_to_xhci_priv(hcd);
209
210                 /* Just copy data for now */
211                 if (priv_match)
212                         *priv = *priv_match;
213         }
214
215         device_wakeup_enable(hcd->self.controller);
216
217         xhci->clk = clk;
218         xhci->main_hcd = hcd;
219         xhci->shared_hcd = usb_create_shared_hcd(driver, &pdev->dev,
220                         dev_name(&pdev->dev), hcd);
221         if (!xhci->shared_hcd) {
222                 ret = -ENOMEM;
223                 goto disable_clk;
224         }
225
226         if ((node && of_property_read_bool(node, "usb3-lpm-capable")) ||
227                         (pdata && pdata->usb3_lpm_capable))
228                 xhci->quirks |= XHCI_LPM_SUPPORT;
229
230         if (HCC_MAX_PSA(xhci->hcc_params) >= 4)
231                 xhci->shared_hcd->can_do_streams = 1;
232
233         hcd->usb_phy = devm_usb_get_phy_by_phandle(&pdev->dev, "usb-phy", 0);
234         if (IS_ERR(hcd->usb_phy)) {
235                 ret = PTR_ERR(hcd->usb_phy);
236                 if (ret == -EPROBE_DEFER)
237                         goto put_usb3_hcd;
238                 hcd->usb_phy = NULL;
239         } else {
240                 ret = usb_phy_init(hcd->usb_phy);
241                 if (ret)
242                         goto put_usb3_hcd;
243         }
244
245         ret = usb_add_hcd(hcd, irq, IRQF_SHARED);
246         if (ret)
247                 goto disable_usb_phy;
248
249         ret = usb_add_hcd(xhci->shared_hcd, irq, IRQF_SHARED);
250         if (ret)
251                 goto dealloc_usb2_hcd;
252
253         return 0;
254
255
256 dealloc_usb2_hcd:
257         usb_remove_hcd(hcd);
258
259 disable_usb_phy:
260         usb_phy_shutdown(hcd->usb_phy);
261
262 put_usb3_hcd:
263         usb_put_hcd(xhci->shared_hcd);
264
265 disable_clk:
266         if (!IS_ERR(clk))
267                 clk_disable_unprepare(clk);
268
269 put_hcd:
270         usb_put_hcd(hcd);
271
272         return ret;
273 }
274
275 static int xhci_plat_remove(struct platform_device *dev)
276 {
277         struct usb_hcd  *hcd = platform_get_drvdata(dev);
278         struct xhci_hcd *xhci = hcd_to_xhci(hcd);
279         struct clk *clk = xhci->clk;
280
281         usb_remove_hcd(xhci->shared_hcd);
282         usb_phy_shutdown(hcd->usb_phy);
283
284         usb_remove_hcd(hcd);
285         usb_put_hcd(xhci->shared_hcd);
286
287         if (!IS_ERR(clk))
288                 clk_disable_unprepare(clk);
289         usb_put_hcd(hcd);
290
291         return 0;
292 }
293
294 #ifdef CONFIG_PM_SLEEP
295 static int xhci_plat_suspend(struct device *dev)
296 {
297         struct usb_hcd  *hcd = dev_get_drvdata(dev);
298         struct xhci_hcd *xhci = hcd_to_xhci(hcd);
299
300         /*
301          * xhci_suspend() needs `do_wakeup` to know whether host is allowed
302          * to do wakeup during suspend. Since xhci_plat_suspend is currently
303          * only designed for system suspend, device_may_wakeup() is enough
304          * to dertermine whether host is allowed to do wakeup. Need to
305          * reconsider this when xhci_plat_suspend enlarges its scope, e.g.,
306          * also applies to runtime suspend.
307          */
308         return xhci_suspend(xhci, device_may_wakeup(dev));
309 }
310
311 static int xhci_plat_resume(struct device *dev)
312 {
313         struct usb_hcd  *hcd = dev_get_drvdata(dev);
314         struct xhci_hcd *xhci = hcd_to_xhci(hcd);
315
316         return xhci_resume(xhci, 0);
317 }
318
319 static const struct dev_pm_ops xhci_plat_pm_ops = {
320         SET_SYSTEM_SLEEP_PM_OPS(xhci_plat_suspend, xhci_plat_resume)
321 };
322 #define DEV_PM_OPS      (&xhci_plat_pm_ops)
323 #else
324 #define DEV_PM_OPS      NULL
325 #endif /* CONFIG_PM */
326
327 static const struct acpi_device_id usb_xhci_acpi_match[] = {
328         /* XHCI-compliant USB Controller */
329         { "PNP0D10", },
330         { }
331 };
332 MODULE_DEVICE_TABLE(acpi, usb_xhci_acpi_match);
333
334 static struct platform_driver usb_xhci_driver = {
335         .probe  = xhci_plat_probe,
336         .remove = xhci_plat_remove,
337         .driver = {
338                 .name = "xhci-hcd",
339                 .pm = DEV_PM_OPS,
340                 .of_match_table = of_match_ptr(usb_xhci_of_match),
341                 .acpi_match_table = ACPI_PTR(usb_xhci_acpi_match),
342         },
343 };
344 MODULE_ALIAS("platform:xhci-hcd");
345
346 static int __init xhci_plat_init(void)
347 {
348         xhci_init_driver(&xhci_plat_hc_driver, &xhci_plat_overrides);
349         return platform_driver_register(&usb_xhci_driver);
350 }
351 module_init(xhci_plat_init);
352
353 static void __exit xhci_plat_exit(void)
354 {
355         platform_driver_unregister(&usb_xhci_driver);
356 }
357 module_exit(xhci_plat_exit);
358
359 MODULE_DESCRIPTION("xHCI Platform Host Controller Driver");
360 MODULE_LICENSE("GPL");