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Linux/drivers/usb/host/ohci-spear.c

  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/clk.h>
 15 #include <linux/dma-mapping.h>
 16 #include <linux/io.h>
 17 #include <linux/kernel.h>
 18 #include <linux/module.h>
 19 #include <linux/of.h>
 20 #include <linux/platform_device.h>
 21 #include <linux/signal.h>
 22 #include <linux/usb.h>
 23 #include <linux/usb/hcd.h>
 24 
 25 #include "ohci.h"
 26 
 27 #define DRIVER_DESC "OHCI SPEAr driver"
 28 
 29 static const char hcd_name[] = "SPEAr-ohci";
 30 struct spear_ohci {
 31         struct clk *clk;
 32 };
 33 
 34 #define to_spear_ohci(hcd)     (struct spear_ohci *)(hcd_to_ohci(hcd)->priv)
 35 
 36 static struct hc_driver __read_mostly ohci_spear_hc_driver;
 37 
 38 static int spear_ohci_hcd_drv_probe(struct platform_device *pdev)
 39 {
 40         const struct hc_driver *driver = &ohci_spear_hc_driver;
 41         struct ohci_hcd *ohci;
 42         struct usb_hcd *hcd = NULL;
 43         struct clk *usbh_clk;
 44         struct spear_ohci *sohci_p;
 45         struct resource *res;
 46         int retval, irq;
 47 
 48         irq = platform_get_irq(pdev, 0);
 49         if (irq < 0) {
 50                 retval = irq;
 51                 goto fail;
 52         }
 53 
 54         /*
 55          * Right now device-tree probed devices don't get dma_mask set.
 56          * Since shared usb code relies on it, set it here for now.
 57          * Once we have dma capability bindings this can go away.
 58          */
 59         retval = dma_coerce_mask_and_coherent(&pdev->dev, DMA_BIT_MASK(32));
 60         if (retval)
 61                 goto fail;
 62 
 63         usbh_clk = devm_clk_get(&pdev->dev, NULL);
 64         if (IS_ERR(usbh_clk)) {
 65                 dev_err(&pdev->dev, "Error getting interface clock\n");
 66                 retval = PTR_ERR(usbh_clk);
 67                 goto fail;
 68         }
 69 
 70         hcd = usb_create_hcd(driver, &pdev->dev, dev_name(&pdev->dev));
 71         if (!hcd) {
 72                 retval = -ENOMEM;
 73                 goto fail;
 74         }
 75 
 76         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 77         if (!res) {
 78                 retval = -ENODEV;
 79                 goto err_put_hcd;
 80         }
 81 
 82         hcd->rsrc_start = pdev->resource[0].start;
 83         hcd->rsrc_len = resource_size(res);
 84 
 85         hcd->regs = devm_ioremap_resource(&pdev->dev, res);
 86         if (IS_ERR(hcd->regs)) {
 87                 retval = PTR_ERR(hcd->regs);
 88                 goto err_put_hcd;
 89         }
 90 
 91         sohci_p = to_spear_ohci(hcd);
 92         sohci_p->clk = usbh_clk;
 93 
 94         clk_prepare_enable(sohci_p->clk);
 95 
 96         ohci = hcd_to_ohci(hcd);
 97 
 98         retval = usb_add_hcd(hcd, platform_get_irq(pdev, 0), 0);
 99         if (retval == 0) {
100                 device_wakeup_enable(hcd->self.controller);
101                 return retval;
102         }
103 
104         clk_disable_unprepare(sohci_p->clk);
105 err_put_hcd:
106         usb_put_hcd(hcd);
107 fail:
108         dev_err(&pdev->dev, "init fail, %d\n", retval);
109 
110         return retval;
111 }
112 
113 static int spear_ohci_hcd_drv_remove(struct platform_device *pdev)
114 {
115         struct usb_hcd *hcd = platform_get_drvdata(pdev);
116         struct spear_ohci *sohci_p = to_spear_ohci(hcd);
117 
118         usb_remove_hcd(hcd);
119         if (sohci_p->clk)
120                 clk_disable_unprepare(sohci_p->clk);
121 
122         usb_put_hcd(hcd);
123         return 0;
124 }
125 
126 #if defined(CONFIG_PM)
127 static int spear_ohci_hcd_drv_suspend(struct platform_device *pdev,
128                 pm_message_t message)
129 {
130         struct usb_hcd *hcd = platform_get_drvdata(pdev);
131         struct ohci_hcd *ohci = hcd_to_ohci(hcd);
132         struct spear_ohci *sohci_p = to_spear_ohci(hcd);
133         bool do_wakeup = device_may_wakeup(&pdev->dev);
134         int ret;
135 
136         if (time_before(jiffies, ohci->next_statechange))
137                 msleep(5);
138         ohci->next_statechange = jiffies;
139 
140         ret = ohci_suspend(hcd, do_wakeup);
141         if (ret)
142                 return ret;
143 
144         clk_disable_unprepare(sohci_p->clk);
145 
146         return ret;
147 }
148 
149 static int spear_ohci_hcd_drv_resume(struct platform_device *dev)
150 {
151         struct usb_hcd *hcd = platform_get_drvdata(dev);
152         struct ohci_hcd *ohci = hcd_to_ohci(hcd);
153         struct spear_ohci *sohci_p = to_spear_ohci(hcd);
154 
155         if (time_before(jiffies, ohci->next_statechange))
156                 msleep(5);
157         ohci->next_statechange = jiffies;
158 
159         clk_prepare_enable(sohci_p->clk);
160         ohci_resume(hcd, false);
161         return 0;
162 }
163 #endif
164 
165 static struct of_device_id spear_ohci_id_table[] = {
166         { .compatible = "st,spear600-ohci", },
167         { },
168 };
169 
170 /* Driver definition to register with the platform bus */
171 static struct platform_driver spear_ohci_hcd_driver = {
172         .probe =        spear_ohci_hcd_drv_probe,
173         .remove =       spear_ohci_hcd_drv_remove,
174 #ifdef CONFIG_PM
175         .suspend =      spear_ohci_hcd_drv_suspend,
176         .resume =       spear_ohci_hcd_drv_resume,
177 #endif
178         .driver = {
179                 .owner = THIS_MODULE,
180                 .name = "spear-ohci",
181                 .of_match_table = spear_ohci_id_table,
182         },
183 };
184 
185 static const struct ohci_driver_overrides spear_overrides __initconst = {
186         .extra_priv_size = sizeof(struct spear_ohci),
187 };
188 static int __init ohci_spear_init(void)
189 {
190         if (usb_disabled())
191                 return -ENODEV;
192 
193         pr_info("%s: " DRIVER_DESC "\n", hcd_name);
194 
195         ohci_init_driver(&ohci_spear_hc_driver, &spear_overrides);
196         return platform_driver_register(&spear_ohci_hcd_driver);
197 }
198 module_init(ohci_spear_init);
199 
200 static void __exit ohci_spear_cleanup(void)
201 {
202         platform_driver_unregister(&spear_ohci_hcd_driver);
203 }
204 module_exit(ohci_spear_cleanup);
205 
206 MODULE_DESCRIPTION(DRIVER_DESC);
207 MODULE_AUTHOR("Deepak Sikri");
208 MODULE_LICENSE("GPL v2");
209 MODULE_ALIAS("platform:spear-ohci");
210 

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