tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
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
23#include "xhci.h"
24#include "xhci-mvebu.h"
25#include "xhci-rcar.h"
26
27static struct hc_driver __read_mostly xhci_plat_hc_driver;
28
29static int xhci_plat_setup(struct usb_hcd *hcd);
30static int xhci_plat_start(struct usb_hcd *hcd);
31
32static const struct xhci_driver_overrides xhci_plat_overrides __initconst = {
33 .extra_priv_size = sizeof(struct xhci_hcd),
34 .reset = xhci_plat_setup,
35 .start = xhci_plat_start,
36};
37
38static void xhci_plat_quirks(struct device *dev, struct xhci_hcd *xhci)
39{
40 /*
41 * As of now platform drivers don't provide MSI support so we ensure
42 * here that the generic code does not try to make a pci_dev from our
43 * dev struct in order to setup MSI
44 */
45 xhci->quirks |= XHCI_PLAT;
46}
47
48/* called during probe() after chip reset completes */
49static int xhci_plat_setup(struct usb_hcd *hcd)
50{
51 struct device_node *of_node = hcd->self.controller->of_node;
52 int ret;
53
54 if (of_device_is_compatible(of_node, "renesas,xhci-r8a7790") ||
55 of_device_is_compatible(of_node, "renesas,xhci-r8a7791")) {
56 ret = xhci_rcar_init_quirk(hcd);
57 if (ret)
58 return ret;
59 }
60
61 return xhci_gen_setup(hcd, xhci_plat_quirks);
62}
63
64static int xhci_plat_start(struct usb_hcd *hcd)
65{
66 struct device_node *of_node = hcd->self.controller->of_node;
67
68 if (of_device_is_compatible(of_node, "renesas,xhci-r8a7790") ||
69 of_device_is_compatible(of_node, "renesas,xhci-r8a7791"))
70 xhci_rcar_start(hcd);
71
72 return xhci_run(hcd);
73}
74
75static int xhci_plat_probe(struct platform_device *pdev)
76{
77 struct device_node *node = pdev->dev.of_node;
78 struct usb_xhci_pdata *pdata = dev_get_platdata(&pdev->dev);
79 const struct hc_driver *driver;
80 struct xhci_hcd *xhci;
81 struct resource *res;
82 struct usb_hcd *hcd;
83 struct clk *clk;
84 int ret;
85 int irq;
86
87 if (usb_disabled())
88 return -ENODEV;
89
90 driver = &xhci_plat_hc_driver;
91
92 irq = platform_get_irq(pdev, 0);
93 if (irq < 0)
94 return -ENODEV;
95
96 /* Initialize dma_mask and coherent_dma_mask to 32-bits */
97 ret = dma_set_coherent_mask(&pdev->dev, DMA_BIT_MASK(32));
98 if (ret)
99 return ret;
100 if (!pdev->dev.dma_mask)
101 pdev->dev.dma_mask = &pdev->dev.coherent_dma_mask;
102 else
103 dma_set_mask(&pdev->dev, DMA_BIT_MASK(32));
104
105 hcd = usb_create_hcd(driver, &pdev->dev, dev_name(&pdev->dev));
106 if (!hcd)
107 return -ENOMEM;
108
109 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
110 hcd->regs = devm_ioremap_resource(&pdev->dev, res);
111 if (IS_ERR(hcd->regs)) {
112 ret = PTR_ERR(hcd->regs);
113 goto put_hcd;
114 }
115
116 hcd->rsrc_start = res->start;
117 hcd->rsrc_len = resource_size(res);
118
119 /*
120 * Not all platforms have a clk so it is not an error if the
121 * clock does not exists.
122 */
123 clk = devm_clk_get(&pdev->dev, NULL);
124 if (!IS_ERR(clk)) {
125 ret = clk_prepare_enable(clk);
126 if (ret)
127 goto put_hcd;
128 }
129
130 if (of_device_is_compatible(pdev->dev.of_node,
131 "marvell,armada-375-xhci") ||
132 of_device_is_compatible(pdev->dev.of_node,
133 "marvell,armada-380-xhci")) {
134 ret = xhci_mvebu_mbus_init_quirk(pdev);
135 if (ret)
136 goto disable_clk;
137 }
138
139 device_wakeup_enable(hcd->self.controller);
140
141 xhci = hcd_to_xhci(hcd);
142 xhci->clk = clk;
143 xhci->main_hcd = hcd;
144 xhci->shared_hcd = usb_create_shared_hcd(driver, &pdev->dev,
145 dev_name(&pdev->dev), hcd);
146 if (!xhci->shared_hcd) {
147 ret = -ENOMEM;
148 goto disable_clk;
149 }
150
151 if ((node && of_property_read_bool(node, "usb3-lpm-capable")) ||
152 (pdata && pdata->usb3_lpm_capable))
153 xhci->quirks |= XHCI_LPM_SUPPORT;
154
155 if (HCC_MAX_PSA(xhci->hcc_params) >= 4)
156 xhci->shared_hcd->can_do_streams = 1;
157
158 hcd->usb_phy = devm_usb_get_phy_by_phandle(&pdev->dev, "usb-phy", 0);
159 if (IS_ERR(hcd->usb_phy)) {
160 ret = PTR_ERR(hcd->usb_phy);
161 if (ret == -EPROBE_DEFER)
162 goto put_usb3_hcd;
163 hcd->usb_phy = NULL;
164 } else {
165 ret = usb_phy_init(hcd->usb_phy);
166 if (ret)
167 goto put_usb3_hcd;
168 }
169
170 ret = usb_add_hcd(hcd, irq, IRQF_SHARED);
171 if (ret)
172 goto disable_usb_phy;
173
174 ret = usb_add_hcd(xhci->shared_hcd, irq, IRQF_SHARED);
175 if (ret)
176 goto dealloc_usb2_hcd;
177
178 return 0;
179
180
181dealloc_usb2_hcd:
182 usb_remove_hcd(hcd);
183
184disable_usb_phy:
185 usb_phy_shutdown(hcd->usb_phy);
186
187put_usb3_hcd:
188 usb_put_hcd(xhci->shared_hcd);
189
190disable_clk:
191 if (!IS_ERR(clk))
192 clk_disable_unprepare(clk);
193
194put_hcd:
195 usb_put_hcd(hcd);
196
197 return ret;
198}
199
200static int xhci_plat_remove(struct platform_device *dev)
201{
202 struct usb_hcd *hcd = platform_get_drvdata(dev);
203 struct xhci_hcd *xhci = hcd_to_xhci(hcd);
204 struct clk *clk = xhci->clk;
205
206 usb_remove_hcd(xhci->shared_hcd);
207 usb_phy_shutdown(hcd->usb_phy);
208
209 usb_remove_hcd(hcd);
210 usb_put_hcd(xhci->shared_hcd);
211
212 if (!IS_ERR(clk))
213 clk_disable_unprepare(clk);
214 usb_put_hcd(hcd);
215
216 return 0;
217}
218
219#ifdef CONFIG_PM_SLEEP
220static int xhci_plat_suspend(struct device *dev)
221{
222 struct usb_hcd *hcd = dev_get_drvdata(dev);
223 struct xhci_hcd *xhci = hcd_to_xhci(hcd);
224
225 /*
226 * xhci_suspend() needs `do_wakeup` to know whether host is allowed
227 * to do wakeup during suspend. Since xhci_plat_suspend is currently
228 * only designed for system suspend, device_may_wakeup() is enough
229 * to dertermine whether host is allowed to do wakeup. Need to
230 * reconsider this when xhci_plat_suspend enlarges its scope, e.g.,
231 * also applies to runtime suspend.
232 */
233 return xhci_suspend(xhci, device_may_wakeup(dev));
234}
235
236static int xhci_plat_resume(struct device *dev)
237{
238 struct usb_hcd *hcd = dev_get_drvdata(dev);
239 struct xhci_hcd *xhci = hcd_to_xhci(hcd);
240
241 return xhci_resume(xhci, 0);
242}
243
244static const struct dev_pm_ops xhci_plat_pm_ops = {
245 SET_SYSTEM_SLEEP_PM_OPS(xhci_plat_suspend, xhci_plat_resume)
246};
247#define DEV_PM_OPS (&xhci_plat_pm_ops)
248#else
249#define DEV_PM_OPS NULL
250#endif /* CONFIG_PM */
251
252#ifdef CONFIG_OF
253static const struct of_device_id usb_xhci_of_match[] = {
254 { .compatible = "generic-xhci" },
255 { .compatible = "xhci-platform" },
256 { .compatible = "marvell,armada-375-xhci"},
257 { .compatible = "marvell,armada-380-xhci"},
258 { .compatible = "renesas,xhci-r8a7790"},
259 { .compatible = "renesas,xhci-r8a7791"},
260 { },
261};
262MODULE_DEVICE_TABLE(of, usb_xhci_of_match);
263#endif
264
265static struct platform_driver usb_xhci_driver = {
266 .probe = xhci_plat_probe,
267 .remove = xhci_plat_remove,
268 .driver = {
269 .name = "xhci-hcd",
270 .pm = DEV_PM_OPS,
271 .of_match_table = of_match_ptr(usb_xhci_of_match),
272 },
273};
274MODULE_ALIAS("platform:xhci-hcd");
275
276static int __init xhci_plat_init(void)
277{
278 xhci_init_driver(&xhci_plat_hc_driver, &xhci_plat_overrides);
279 return platform_driver_register(&usb_xhci_driver);
280}
281module_init(xhci_plat_init);
282
283static void __exit xhci_plat_exit(void)
284{
285 platform_driver_unregister(&usb_xhci_driver);
286}
287module_exit(xhci_plat_exit);
288
289MODULE_DESCRIPTION("xHCI Platform Host Controller Driver");
290MODULE_LICENSE("GPL");