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Linux/drivers/usb/host/ehci-exynos.c

  1 /*
  2  * SAMSUNG EXYNOS USB HOST EHCI Controller
  3  *
  4  * Copyright (C) 2011 Samsung Electronics Co.Ltd
  5  * Author: Jingoo Han <jg1.han@samsung.com>
  6  * Author: Joonyoung Shim <jy0922.shim@samsung.com>
  7  *
  8  * This program is free software; you can redistribute  it and/or modify it
  9  * under  the terms of  the GNU General  Public License as published by the
 10  * Free Software Foundation;  either version 2 of the  License, or (at your
 11  * option) any later version.
 12  *
 13  */
 14 
 15 #include <linux/clk.h>
 16 #include <linux/dma-mapping.h>
 17 #include <linux/io.h>
 18 #include <linux/kernel.h>
 19 #include <linux/module.h>
 20 #include <linux/of.h>
 21 #include <linux/of_gpio.h>
 22 #include <linux/phy/phy.h>
 23 #include <linux/platform_device.h>
 24 #include <linux/usb.h>
 25 #include <linux/usb/hcd.h>
 26 
 27 #include "ehci.h"
 28 
 29 #define DRIVER_DESC "EHCI EXYNOS driver"
 30 
 31 #define EHCI_INSNREG00(base)                    (base + 0x90)
 32 #define EHCI_INSNREG00_ENA_INCR16               (0x1 << 25)
 33 #define EHCI_INSNREG00_ENA_INCR8                (0x1 << 24)
 34 #define EHCI_INSNREG00_ENA_INCR4                (0x1 << 23)
 35 #define EHCI_INSNREG00_ENA_INCRX_ALIGN          (0x1 << 22)
 36 #define EHCI_INSNREG00_ENABLE_DMA_BURST \
 37         (EHCI_INSNREG00_ENA_INCR16 | EHCI_INSNREG00_ENA_INCR8 | \
 38          EHCI_INSNREG00_ENA_INCR4 | EHCI_INSNREG00_ENA_INCRX_ALIGN)
 39 
 40 static const char hcd_name[] = "ehci-exynos";
 41 static struct hc_driver __read_mostly exynos_ehci_hc_driver;
 42 
 43 #define PHY_NUMBER 3
 44 
 45 struct exynos_ehci_hcd {
 46         struct clk *clk;
 47         struct phy *phy[PHY_NUMBER];
 48 };
 49 
 50 #define to_exynos_ehci(hcd) (struct exynos_ehci_hcd *)(hcd_to_ehci(hcd)->priv)
 51 
 52 static int exynos_ehci_get_phy(struct device *dev,
 53                                 struct exynos_ehci_hcd *exynos_ehci)
 54 {
 55         struct device_node *child;
 56         struct phy *phy;
 57         int phy_number;
 58         int ret;
 59 
 60         /* Get PHYs for the controller */
 61         for_each_available_child_of_node(dev->of_node, child) {
 62                 ret = of_property_read_u32(child, "reg", &phy_number);
 63                 if (ret) {
 64                         dev_err(dev, "Failed to parse device tree\n");
 65                         of_node_put(child);
 66                         return ret;
 67                 }
 68 
 69                 if (phy_number >= PHY_NUMBER) {
 70                         dev_err(dev, "Invalid number of PHYs\n");
 71                         of_node_put(child);
 72                         return -EINVAL;
 73                 }
 74 
 75                 phy = devm_of_phy_get(dev, child, NULL);
 76                 exynos_ehci->phy[phy_number] = phy;
 77                 if (IS_ERR(phy)) {
 78                         ret = PTR_ERR(phy);
 79                         if (ret == -EPROBE_DEFER) {
 80                                 return ret;
 81                         } else if (ret != -ENOSYS && ret != -ENODEV) {
 82                                 dev_err(dev,
 83                                         "Error retrieving usb2 phy: %d\n", ret);
 84                                 return ret;
 85                         }
 86                 }
 87         }
 88 
 89         return 0;
 90 }
 91 
 92 static int exynos_ehci_phy_enable(struct device *dev)
 93 {
 94         struct usb_hcd *hcd = dev_get_drvdata(dev);
 95         struct exynos_ehci_hcd *exynos_ehci = to_exynos_ehci(hcd);
 96         int i;
 97         int ret = 0;
 98 
 99         for (i = 0; ret == 0 && i < PHY_NUMBER; i++)
100                 if (!IS_ERR(exynos_ehci->phy[i]))
101                         ret = phy_power_on(exynos_ehci->phy[i]);
102         if (ret)
103                 for (i--; i >= 0; i--)
104                         if (!IS_ERR(exynos_ehci->phy[i]))
105                                 phy_power_off(exynos_ehci->phy[i]);
106 
107         return ret;
108 }
109 
110 static void exynos_ehci_phy_disable(struct device *dev)
111 {
112         struct usb_hcd *hcd = dev_get_drvdata(dev);
113         struct exynos_ehci_hcd *exynos_ehci = to_exynos_ehci(hcd);
114         int i;
115 
116         for (i = 0; i < PHY_NUMBER; i++)
117                 if (!IS_ERR(exynos_ehci->phy[i]))
118                         phy_power_off(exynos_ehci->phy[i]);
119 }
120 
121 static void exynos_setup_vbus_gpio(struct device *dev)
122 {
123         int err;
124         int gpio;
125 
126         if (!dev->of_node)
127                 return;
128 
129         gpio = of_get_named_gpio(dev->of_node, "samsung,vbus-gpio", 0);
130         if (!gpio_is_valid(gpio))
131                 return;
132 
133         err = devm_gpio_request_one(dev, gpio, GPIOF_OUT_INIT_HIGH,
134                                     "ehci_vbus_gpio");
135         if (err)
136                 dev_err(dev, "can't request ehci vbus gpio %d", gpio);
137 }
138 
139 static int exynos_ehci_probe(struct platform_device *pdev)
140 {
141         struct exynos_ehci_hcd *exynos_ehci;
142         struct usb_hcd *hcd;
143         struct ehci_hcd *ehci;
144         struct resource *res;
145         int irq;
146         int err;
147 
148         /*
149          * Right now device-tree probed devices don't get dma_mask set.
150          * Since shared usb code relies on it, set it here for now.
151          * Once we move to full device tree support this will vanish off.
152          */
153         err = dma_coerce_mask_and_coherent(&pdev->dev, DMA_BIT_MASK(32));
154         if (err)
155                 return err;
156 
157         exynos_setup_vbus_gpio(&pdev->dev);
158 
159         hcd = usb_create_hcd(&exynos_ehci_hc_driver,
160                              &pdev->dev, dev_name(&pdev->dev));
161         if (!hcd) {
162                 dev_err(&pdev->dev, "Unable to create HCD\n");
163                 return -ENOMEM;
164         }
165         exynos_ehci = to_exynos_ehci(hcd);
166 
167         if (of_device_is_compatible(pdev->dev.of_node,
168                                         "samsung,exynos5440-ehci"))
169                 goto skip_phy;
170 
171         err = exynos_ehci_get_phy(&pdev->dev, exynos_ehci);
172         if (err)
173                 goto fail_clk;
174 
175 skip_phy:
176 
177         exynos_ehci->clk = devm_clk_get(&pdev->dev, "usbhost");
178 
179         if (IS_ERR(exynos_ehci->clk)) {
180                 dev_err(&pdev->dev, "Failed to get usbhost clock\n");
181                 err = PTR_ERR(exynos_ehci->clk);
182                 goto fail_clk;
183         }
184 
185         err = clk_prepare_enable(exynos_ehci->clk);
186         if (err)
187                 goto fail_clk;
188 
189         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
190         hcd->regs = devm_ioremap_resource(&pdev->dev, res);
191         if (IS_ERR(hcd->regs)) {
192                 err = PTR_ERR(hcd->regs);
193                 goto fail_io;
194         }
195 
196         hcd->rsrc_start = res->start;
197         hcd->rsrc_len = resource_size(res);
198 
199         irq = platform_get_irq(pdev, 0);
200         if (!irq) {
201                 dev_err(&pdev->dev, "Failed to get IRQ\n");
202                 err = -ENODEV;
203                 goto fail_io;
204         }
205 
206         err = exynos_ehci_phy_enable(&pdev->dev);
207         if (err) {
208                 dev_err(&pdev->dev, "Failed to enable USB phy\n");
209                 goto fail_io;
210         }
211 
212         ehci = hcd_to_ehci(hcd);
213         ehci->caps = hcd->regs;
214 
215         /* DMA burst Enable */
216         writel(EHCI_INSNREG00_ENABLE_DMA_BURST, EHCI_INSNREG00(hcd->regs));
217 
218         err = usb_add_hcd(hcd, irq, IRQF_SHARED);
219         if (err) {
220                 dev_err(&pdev->dev, "Failed to add USB HCD\n");
221                 goto fail_add_hcd;
222         }
223         device_wakeup_enable(hcd->self.controller);
224 
225         platform_set_drvdata(pdev, hcd);
226 
227         return 0;
228 
229 fail_add_hcd:
230         exynos_ehci_phy_disable(&pdev->dev);
231 fail_io:
232         clk_disable_unprepare(exynos_ehci->clk);
233 fail_clk:
234         usb_put_hcd(hcd);
235         return err;
236 }
237 
238 static int exynos_ehci_remove(struct platform_device *pdev)
239 {
240         struct usb_hcd *hcd = platform_get_drvdata(pdev);
241         struct exynos_ehci_hcd *exynos_ehci = to_exynos_ehci(hcd);
242 
243         usb_remove_hcd(hcd);
244 
245         exynos_ehci_phy_disable(&pdev->dev);
246 
247         clk_disable_unprepare(exynos_ehci->clk);
248 
249         usb_put_hcd(hcd);
250 
251         return 0;
252 }
253 
254 #ifdef CONFIG_PM
255 static int exynos_ehci_suspend(struct device *dev)
256 {
257         struct usb_hcd *hcd = dev_get_drvdata(dev);
258         struct exynos_ehci_hcd *exynos_ehci = to_exynos_ehci(hcd);
259 
260         bool do_wakeup = device_may_wakeup(dev);
261         int rc;
262 
263         rc = ehci_suspend(hcd, do_wakeup);
264         if (rc)
265                 return rc;
266 
267         exynos_ehci_phy_disable(dev);
268 
269         clk_disable_unprepare(exynos_ehci->clk);
270 
271         return rc;
272 }
273 
274 static int exynos_ehci_resume(struct device *dev)
275 {
276         struct usb_hcd *hcd = dev_get_drvdata(dev);
277         struct exynos_ehci_hcd *exynos_ehci = to_exynos_ehci(hcd);
278         int ret;
279 
280         clk_prepare_enable(exynos_ehci->clk);
281 
282         ret = exynos_ehci_phy_enable(dev);
283         if (ret) {
284                 dev_err(dev, "Failed to enable USB phy\n");
285                 clk_disable_unprepare(exynos_ehci->clk);
286                 return ret;
287         }
288 
289         /* DMA burst Enable */
290         writel(EHCI_INSNREG00_ENABLE_DMA_BURST, EHCI_INSNREG00(hcd->regs));
291 
292         ehci_resume(hcd, false);
293         return 0;
294 }
295 #else
296 #define exynos_ehci_suspend     NULL
297 #define exynos_ehci_resume      NULL
298 #endif
299 
300 static const struct dev_pm_ops exynos_ehci_pm_ops = {
301         .suspend        = exynos_ehci_suspend,
302         .resume         = exynos_ehci_resume,
303 };
304 
305 #ifdef CONFIG_OF
306 static const struct of_device_id exynos_ehci_match[] = {
307         { .compatible = "samsung,exynos4210-ehci" },
308         { .compatible = "samsung,exynos5440-ehci" },
309         {},
310 };
311 MODULE_DEVICE_TABLE(of, exynos_ehci_match);
312 #endif
313 
314 static struct platform_driver exynos_ehci_driver = {
315         .probe          = exynos_ehci_probe,
316         .remove         = exynos_ehci_remove,
317         .shutdown       = usb_hcd_platform_shutdown,
318         .driver = {
319                 .name   = "exynos-ehci",
320                 .pm     = &exynos_ehci_pm_ops,
321                 .of_match_table = of_match_ptr(exynos_ehci_match),
322         }
323 };
324 static const struct ehci_driver_overrides exynos_overrides __initdata = {
325         .extra_priv_size = sizeof(struct exynos_ehci_hcd),
326 };
327 
328 static int __init ehci_exynos_init(void)
329 {
330         if (usb_disabled())
331                 return -ENODEV;
332 
333         pr_info("%s: " DRIVER_DESC "\n", hcd_name);
334         ehci_init_driver(&exynos_ehci_hc_driver, &exynos_overrides);
335         return platform_driver_register(&exynos_ehci_driver);
336 }
337 module_init(ehci_exynos_init);
338 
339 static void __exit ehci_exynos_cleanup(void)
340 {
341         platform_driver_unregister(&exynos_ehci_driver);
342 }
343 module_exit(ehci_exynos_cleanup);
344 
345 MODULE_DESCRIPTION(DRIVER_DESC);
346 MODULE_ALIAS("platform:exynos-ehci");
347 MODULE_AUTHOR("Jingoo Han");
348 MODULE_AUTHOR("Joonyoung Shim");
349 MODULE_LICENSE("GPL v2");
350 

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