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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         hcd->regs = devm_ioremap_resource(&pdev->dev, res);
 73         if (IS_ERR(hcd->regs)) {
 74                 ret = PTR_ERR(hcd->regs);
 75                 goto err_alloc;
 76         }
 77         hcd->rsrc_start = res->start;
 78         hcd->rsrc_len = resource_size(res);
 79 
 80         hcd->has_tt = 1;
 81         ehci = hcd_to_ehci(hcd);
 82         priv = (struct ehci_mxc_priv *) ehci->priv;
 83 
 84         /* enable clocks */
 85         priv->usbclk = devm_clk_get(&pdev->dev, "ipg");
 86         if (IS_ERR(priv->usbclk)) {
 87                 ret = PTR_ERR(priv->usbclk);
 88                 goto err_alloc;
 89         }
 90         clk_prepare_enable(priv->usbclk);
 91 
 92         priv->ahbclk = devm_clk_get(&pdev->dev, "ahb");
 93         if (IS_ERR(priv->ahbclk)) {
 94                 ret = PTR_ERR(priv->ahbclk);
 95                 goto err_clk_ahb;
 96         }
 97         clk_prepare_enable(priv->ahbclk);
 98 
 99         /* "dr" device has its own clock on i.MX51 */
100         priv->phyclk = devm_clk_get(&pdev->dev, "phy");
101         if (IS_ERR(priv->phyclk))
102                 priv->phyclk = NULL;
103         if (priv->phyclk)
104                 clk_prepare_enable(priv->phyclk);
105 
106 
107         /* call platform specific init function */
108         if (pdata->init) {
109                 ret = pdata->init(pdev);
110                 if (ret) {
111                         dev_err(dev, "platform init failed\n");
112                         goto err_init;
113                 }
114                 /* platforms need some time to settle changed IO settings */
115                 mdelay(10);
116         }
117 
118         /* EHCI registers start at offset 0x100 */
119         ehci->caps = hcd->regs + 0x100;
120         ehci->regs = hcd->regs + 0x100 +
121                 HC_LENGTH(ehci, ehci_readl(ehci, &ehci->caps->hc_capbase));
122 
123         /* set up the PORTSCx register */
124         ehci_writel(ehci, pdata->portsc, &ehci->regs->port_status[0]);
125 
126         /* is this really needed? */
127         msleep(10);
128 
129         /* Initialize the transceiver */
130         if (pdata->otg) {
131                 pdata->otg->io_priv = hcd->regs + ULPI_VIEWPORT_OFFSET;
132                 ret = usb_phy_init(pdata->otg);
133                 if (ret) {
134                         dev_err(dev, "unable to init transceiver, probably missing\n");
135                         ret = -ENODEV;
136                         goto err_add;
137                 }
138                 ret = otg_set_vbus(pdata->otg->otg, 1);
139                 if (ret) {
140                         dev_err(dev, "unable to enable vbus on transceiver\n");
141                         goto err_add;
142                 }
143         }
144 
145         platform_set_drvdata(pdev, hcd);
146 
147         ret = usb_add_hcd(hcd, irq, IRQF_SHARED);
148         if (ret)
149                 goto err_add;
150 
151         device_wakeup_enable(hcd->self.controller);
152         return 0;
153 
154 err_add:
155         if (pdata && pdata->exit)
156                 pdata->exit(pdev);
157 err_init:
158         if (priv->phyclk)
159                 clk_disable_unprepare(priv->phyclk);
160 
161         clk_disable_unprepare(priv->ahbclk);
162 err_clk_ahb:
163         clk_disable_unprepare(priv->usbclk);
164 err_alloc:
165         usb_put_hcd(hcd);
166         return ret;
167 }
168 
169 static int ehci_mxc_drv_remove(struct platform_device *pdev)
170 {
171         struct mxc_usbh_platform_data *pdata = dev_get_platdata(&pdev->dev);
172         struct usb_hcd *hcd = platform_get_drvdata(pdev);
173         struct ehci_hcd *ehci = hcd_to_ehci(hcd);
174         struct ehci_mxc_priv *priv = (struct ehci_mxc_priv *) ehci->priv;
175 
176         usb_remove_hcd(hcd);
177 
178         if (pdata && pdata->exit)
179                 pdata->exit(pdev);
180 
181         if (pdata && pdata->otg)
182                 usb_phy_shutdown(pdata->otg);
183 
184         clk_disable_unprepare(priv->usbclk);
185         clk_disable_unprepare(priv->ahbclk);
186 
187         if (priv->phyclk)
188                 clk_disable_unprepare(priv->phyclk);
189 
190         usb_put_hcd(hcd);
191         return 0;
192 }
193 
194 MODULE_ALIAS("platform:mxc-ehci");
195 
196 static struct platform_driver ehci_mxc_driver = {
197         .probe = ehci_mxc_drv_probe,
198         .remove = ehci_mxc_drv_remove,
199         .shutdown = usb_hcd_platform_shutdown,
200         .driver = {
201                    .name = "mxc-ehci",
202         },
203 };
204 
205 static int __init ehci_mxc_init(void)
206 {
207         if (usb_disabled())
208                 return -ENODEV;
209 
210         pr_info("%s: " DRIVER_DESC "\n", hcd_name);
211 
212         ehci_init_driver(&ehci_mxc_hc_driver, &ehci_mxc_overrides);
213         return platform_driver_register(&ehci_mxc_driver);
214 }
215 module_init(ehci_mxc_init);
216 
217 static void __exit ehci_mxc_cleanup(void)
218 {
219         platform_driver_unregister(&ehci_mxc_driver);
220 }
221 module_exit(ehci_mxc_cleanup);
222 
223 MODULE_DESCRIPTION(DRIVER_DESC);
224 MODULE_AUTHOR("Sascha Hauer");
225 MODULE_LICENSE("GPL");
226 

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