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

  1 /*
  2  * Copyright (c) 2008 Sascha Hauer <s.hauer@pengutronix.de>, Pengutronix
  3  * Copyright (c) 2009 Daniel Mack <daniel@caiaq.de>
  4  *
  5  * This program is free software; you can redistribute it and/or modify it
  6  * under the terms of the GNU General Public License as published by the
  7  * Free Software Foundation; either version 2 of the License, or (at your
  8  * option) any later version.
  9  *
 10  * This program is distributed in the hope that it will be useful, but
 11  * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
 12  * or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
 13  * for more details.
 14  *
 15  * You should have received a copy of the GNU General Public License
 16  * along with this program; if not, write to the Free Software Foundation,
 17  * Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
 18  */
 19 
 20 #include <linux/kernel.h>
 21 #include <linux/module.h>
 22 #include <linux/io.h>
 23 #include <linux/platform_device.h>
 24 #include <linux/clk.h>
 25 #include <linux/delay.h>
 26 #include <linux/usb/otg.h>
 27 #include <linux/usb/ulpi.h>
 28 #include <linux/slab.h>
 29 #include <linux/usb.h>
 30 #include <linux/usb/hcd.h>
 31 #include <linux/platform_data/usb-ehci-mxc.h>
 32 #include "ehci.h"
 33 
 34 #define DRIVER_DESC "Freescale On-Chip EHCI Host driver"
 35 
 36 static const char hcd_name[] = "ehci-mxc";
 37 
 38 #define ULPI_VIEWPORT_OFFSET    0x170
 39 
 40 struct ehci_mxc_priv {
 41         struct clk *usbclk, *ahbclk, *phyclk;
 42 };
 43 
 44 static struct hc_driver __read_mostly ehci_mxc_hc_driver;
 45 
 46 static const struct ehci_driver_overrides ehci_mxc_overrides __initconst = {
 47         .extra_priv_size =      sizeof(struct ehci_mxc_priv),
 48 };
 49 
 50 static int ehci_mxc_drv_probe(struct platform_device *pdev)
 51 {
 52         struct mxc_usbh_platform_data *pdata = dev_get_platdata(&pdev->dev);
 53         struct usb_hcd *hcd;
 54         struct resource *res;
 55         int irq, ret;
 56         struct ehci_mxc_priv *priv;
 57         struct device *dev = &pdev->dev;
 58         struct ehci_hcd *ehci;
 59 
 60         if (!pdata) {
 61                 dev_err(dev, "No platform data given, bailing out.\n");
 62                 return -EINVAL;
 63         }
 64 
 65         irq = platform_get_irq(pdev, 0);
 66 
 67         hcd = usb_create_hcd(&ehci_mxc_hc_driver, dev, dev_name(dev));
 68         if (!hcd)
 69                 return -ENOMEM;
 70 
 71         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 72         if (!res) {
 73                 dev_err(dev, "Found HC with no register addr. Check setup!\n");
 74                 ret = -ENODEV;
 75                 goto err_alloc;
 76         }
 77 
 78         hcd->rsrc_start = res->start;
 79         hcd->rsrc_len = resource_size(res);
 80 
 81         hcd->regs = devm_ioremap_resource(&pdev->dev, res);
 82         if (IS_ERR(hcd->regs)) {
 83                 ret = PTR_ERR(hcd->regs);
 84                 goto err_alloc;
 85         }
 86 
 87         hcd->has_tt = 1;
 88         ehci = hcd_to_ehci(hcd);
 89         priv = (struct ehci_mxc_priv *) ehci->priv;
 90 
 91         /* enable clocks */
 92         priv->usbclk = devm_clk_get(&pdev->dev, "ipg");
 93         if (IS_ERR(priv->usbclk)) {
 94                 ret = PTR_ERR(priv->usbclk);
 95                 goto err_alloc;
 96         }
 97         clk_prepare_enable(priv->usbclk);
 98 
 99         priv->ahbclk = devm_clk_get(&pdev->dev, "ahb");
100         if (IS_ERR(priv->ahbclk)) {
101                 ret = PTR_ERR(priv->ahbclk);
102                 goto err_clk_ahb;
103         }
104         clk_prepare_enable(priv->ahbclk);
105 
106         /* "dr" device has its own clock on i.MX51 */
107         priv->phyclk = devm_clk_get(&pdev->dev, "phy");
108         if (IS_ERR(priv->phyclk))
109                 priv->phyclk = NULL;
110         if (priv->phyclk)
111                 clk_prepare_enable(priv->phyclk);
112 
113 
114         /* call platform specific init function */
115         if (pdata->init) {
116                 ret = pdata->init(pdev);
117                 if (ret) {
118                         dev_err(dev, "platform init failed\n");
119                         goto err_init;
120                 }
121                 /* platforms need some time to settle changed IO settings */
122                 mdelay(10);
123         }
124 
125         /* EHCI registers start at offset 0x100 */
126         ehci->caps = hcd->regs + 0x100;
127         ehci->regs = hcd->regs + 0x100 +
128                 HC_LENGTH(ehci, ehci_readl(ehci, &ehci->caps->hc_capbase));
129 
130         /* set up the PORTSCx register */
131         ehci_writel(ehci, pdata->portsc, &ehci->regs->port_status[0]);
132 
133         /* is this really needed? */
134         msleep(10);
135 
136         /* Initialize the transceiver */
137         if (pdata->otg) {
138                 pdata->otg->io_priv = hcd->regs + ULPI_VIEWPORT_OFFSET;
139                 ret = usb_phy_init(pdata->otg);
140                 if (ret) {
141                         dev_err(dev, "unable to init transceiver, probably missing\n");
142                         ret = -ENODEV;
143                         goto err_add;
144                 }
145                 ret = otg_set_vbus(pdata->otg->otg, 1);
146                 if (ret) {
147                         dev_err(dev, "unable to enable vbus on transceiver\n");
148                         goto err_add;
149                 }
150         }
151 
152         platform_set_drvdata(pdev, hcd);
153 
154         ret = usb_add_hcd(hcd, irq, IRQF_SHARED);
155         if (ret)
156                 goto err_add;
157 
158         device_wakeup_enable(hcd->self.controller);
159         return 0;
160 
161 err_add:
162         if (pdata && pdata->exit)
163                 pdata->exit(pdev);
164 err_init:
165         if (priv->phyclk)
166                 clk_disable_unprepare(priv->phyclk);
167 
168         clk_disable_unprepare(priv->ahbclk);
169 err_clk_ahb:
170         clk_disable_unprepare(priv->usbclk);
171 err_alloc:
172         usb_put_hcd(hcd);
173         return ret;
174 }
175 
176 static int ehci_mxc_drv_remove(struct platform_device *pdev)
177 {
178         struct mxc_usbh_platform_data *pdata = dev_get_platdata(&pdev->dev);
179         struct usb_hcd *hcd = platform_get_drvdata(pdev);
180         struct ehci_hcd *ehci = hcd_to_ehci(hcd);
181         struct ehci_mxc_priv *priv = (struct ehci_mxc_priv *) ehci->priv;
182 
183         usb_remove_hcd(hcd);
184 
185         if (pdata && pdata->exit)
186                 pdata->exit(pdev);
187 
188         if (pdata && pdata->otg)
189                 usb_phy_shutdown(pdata->otg);
190 
191         clk_disable_unprepare(priv->usbclk);
192         clk_disable_unprepare(priv->ahbclk);
193 
194         if (priv->phyclk)
195                 clk_disable_unprepare(priv->phyclk);
196 
197         usb_put_hcd(hcd);
198         return 0;
199 }
200 
201 MODULE_ALIAS("platform:mxc-ehci");
202 
203 static struct platform_driver ehci_mxc_driver = {
204         .probe = ehci_mxc_drv_probe,
205         .remove = ehci_mxc_drv_remove,
206         .shutdown = usb_hcd_platform_shutdown,
207         .driver = {
208                    .name = "mxc-ehci",
209         },
210 };
211 
212 static int __init ehci_mxc_init(void)
213 {
214         if (usb_disabled())
215                 return -ENODEV;
216 
217         pr_info("%s: " DRIVER_DESC "\n", hcd_name);
218 
219         ehci_init_driver(&ehci_mxc_hc_driver, &ehci_mxc_overrides);
220         return platform_driver_register(&ehci_mxc_driver);
221 }
222 module_init(ehci_mxc_init);
223 
224 static void __exit ehci_mxc_cleanup(void)
225 {
226         platform_driver_unregister(&ehci_mxc_driver);
227 }
228 module_exit(ehci_mxc_cleanup);
229 
230 MODULE_DESCRIPTION(DRIVER_DESC);
231 MODULE_AUTHOR("Sascha Hauer");
232 MODULE_LICENSE("GPL");
233 

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