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/platform_device.h>
  21 #include <linux/clk.h>
  22 #include <linux/delay.h>
  23 #include <linux/usb/otg.h>
  24 #include <linux/usb/ulpi.h>
  25 #include <linux/slab.h>
  26
  27 #include <mach/hardware.h>
  28 #include <linux/platform_data/usb-ehci-mxc.h>
  29
  30 #include <asm/mach-types.h>
  31
  32 #define ULPI_VIEWPORT_OFFSET    0x170
  33
  34 struct ehci_mxc_priv {
  35         struct clk *usbclk, *ahbclk, *phyclk;
  36         struct usb_hcd *hcd;
  37 };
  38
  39 /* called during probe() after chip reset completes */
  40 static int ehci_mxc_setup(struct usb_hcd *hcd)
  41 {
  42         struct ehci_hcd *ehci = hcd_to_ehci(hcd);
  43         int retval;
  44
  45         hcd->has_tt = 1;
  46
  47         retval = ehci_setup(hcd);
  48         if (retval)
  49                 return retval;
  50
  51         ehci_port_power(ehci, 0);
  52         return 0;
  53 }
  54
  55 static const struct hc_driver ehci_mxc_hc_driver = {
  56         .description = hcd_name,
  57         .product_desc = "Freescale On-Chip EHCI Host Controller",
  58         .hcd_priv_size = sizeof(struct ehci_hcd),
  59
  60         /*
  61          * generic hardware linkage
  62          */
  63         .irq = ehci_irq,
  64         .flags = HCD_USB2 | HCD_MEMORY,
  65
  66         /*
  67          * basic lifecycle operations
  68          */
  69         .reset = ehci_mxc_setup,
  70         .start = ehci_run,
  71         .stop = ehci_stop,
  72         .shutdown = ehci_shutdown,
  73
  74         /*
  75          * managing i/o requests and associated device resources
  76          */
  77         .urb_enqueue = ehci_urb_enqueue,
  78         .urb_dequeue = ehci_urb_dequeue,
  79         .endpoint_disable = ehci_endpoint_disable,
  80         .endpoint_reset = ehci_endpoint_reset,
  81
  82         /*
  83          * scheduling support
  84          */
  85         .get_frame_number = ehci_get_frame,
  86
  87         /*
  88          * root hub support
  89          */
  90         .hub_status_data = ehci_hub_status_data,
  91         .hub_control = ehci_hub_control,
  92         .bus_suspend = ehci_bus_suspend,
  93         .bus_resume = ehci_bus_resume,
  94         .relinquish_port = ehci_relinquish_port,
  95         .port_handed_over = ehci_port_handed_over,
  96
  97         .clear_tt_buffer_complete = ehci_clear_tt_buffer_complete,
  98 };
  99
 100 static int ehci_mxc_drv_probe(struct platform_device *pdev)
 101 {
 102         struct mxc_usbh_platform_data *pdata = pdev->dev.platform_data;
 103         struct usb_hcd *hcd;
 104         struct resource *res;
 105         int irq, ret;
 106         unsigned int flags;
 107         struct ehci_mxc_priv *priv;
 108         struct device *dev = &pdev->dev;
 109         struct ehci_hcd *ehci;
 110
 111         dev_info(&pdev->dev, "initializing i.MX USB Controller\n");
 112
 113         if (!pdata) {
 114                 dev_err(dev, "No platform data given, bailing out.\n");
 115                 return -EINVAL;
 116         }
 117
 118         irq = platform_get_irq(pdev, 0);
 119
 120         hcd = usb_create_hcd(&ehci_mxc_hc_driver, dev, dev_name(dev));
 121         if (!hcd)
 122                 return -ENOMEM;
 123
 124         priv = devm_kzalloc(&pdev->dev, sizeof(*priv), GFP_KERNEL);
 125         if (!priv) {
 126                 ret = -ENOMEM;
 127                 goto err_alloc;
 128         }
 129
 130         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 131         if (!res) {
 132                 dev_err(dev, "Found HC with no register addr. Check setup!\n");
 133                 ret = -ENODEV;
 134                 goto err_alloc;
 135         }
 136
 137         hcd->rsrc_start = res->start;
 138         hcd->rsrc_len = resource_size(res);
 139
 140         hcd->regs = devm_request_and_ioremap(&pdev->dev, res);
 141         if (!hcd->regs) {
 142                 dev_err(dev, "error mapping memory\n");
 143                 ret = -EFAULT;
 144                 goto err_alloc;
 145         }
 146
 147         /* enable clocks */
 148         priv->usbclk = devm_clk_get(&pdev->dev, "ipg");
 149         if (IS_ERR(priv->usbclk)) {
 150                 ret = PTR_ERR(priv->usbclk);
 151                 goto err_alloc;
 152         }
 153         clk_prepare_enable(priv->usbclk);
 154
 155         priv->ahbclk = devm_clk_get(&pdev->dev, "ahb");
 156         if (IS_ERR(priv->ahbclk)) {
 157                 ret = PTR_ERR(priv->ahbclk);
 158                 goto err_clk_ahb;
 159         }
 160         clk_prepare_enable(priv->ahbclk);
 161
 162         /* "dr" device has its own clock on i.MX51 */
 163         priv->phyclk = devm_clk_get(&pdev->dev, "phy");
 164         if (IS_ERR(priv->phyclk))
 165                 priv->phyclk = NULL;
 166         if (priv->phyclk)
 167                 clk_prepare_enable(priv->phyclk);
 168
 169
 170         /* call platform specific init function */
 171         if (pdata->init) {
 172                 ret = pdata->init(pdev);
 173                 if (ret) {
 174                         dev_err(dev, "platform init failed\n");
 175                         goto err_init;
 176                 }
 177                 /* platforms need some time to settle changed IO settings */
 178                 mdelay(10);
 179         }
 180
 181         ehci = hcd_to_ehci(hcd);
 182
 183         /* EHCI registers start at offset 0x100 */
 184         ehci->caps = hcd->regs + 0x100;
 185         ehci->regs = hcd->regs + 0x100 +
 186                 HC_LENGTH(ehci, ehci_readl(ehci, &ehci->caps->hc_capbase));
 187
 188         /* set up the PORTSCx register */
 189         ehci_writel(ehci, pdata->portsc, &ehci->regs->port_status[0]);
 190
 191         /* is this really needed? */
 192         msleep(10);
 193
 194         /* Initialize the transceiver */
 195         if (pdata->otg) {
 196                 pdata->otg->io_priv = hcd->regs + ULPI_VIEWPORT_OFFSET;
 197                 ret = usb_phy_init(pdata->otg);
 198                 if (ret) {
 199                         dev_err(dev, "unable to init transceiver, probably missing\n");
 200                         ret = -ENODEV;
 201                         goto err_add;
 202                 }
 203                 ret = otg_set_vbus(pdata->otg->otg, 1);
 204                 if (ret) {
 205                         dev_err(dev, "unable to enable vbus on transceiver\n");
 206                         goto err_add;
 207                 }
 208         }
 209
 210         priv->hcd = hcd;
 211         platform_set_drvdata(pdev, priv);
 212
 213         ret = usb_add_hcd(hcd, irq, IRQF_SHARED);
 214         if (ret)
 215                 goto err_add;
 216
 217         if (pdata->otg) {
 218                 /*
 219                  * efikamx and efikasb have some hardware bug which is
 220                  * preventing usb to work unless CHRGVBUS is set.
 221                  * It's in violation of USB specs
 222                  */
 223                 if (machine_is_mx51_efikamx() || machine_is_mx51_efikasb()) {
 224                         flags = usb_phy_io_read(pdata->otg,
 225                                                         ULPI_OTG_CTRL);
 226                         flags |= ULPI_OTG_CTRL_CHRGVBUS;
 227                         ret = usb_phy_io_write(pdata->otg, flags,
 228                                                         ULPI_OTG_CTRL);
 229                         if (ret) {
 230                                 dev_err(dev, "unable to set CHRVBUS\n");
 231                                 goto err_add;
 232                         }
 233                 }
 234         }
 235
 236         return 0;
 237
 238 err_add:
 239         if (pdata && pdata->exit)
 240                 pdata->exit(pdev);
 241 err_init:
 242         if (priv->phyclk)
 243                 clk_disable_unprepare(priv->phyclk);
 244
 245         clk_disable_unprepare(priv->ahbclk);
 246 err_clk_ahb:
 247         clk_disable_unprepare(priv->usbclk);
 248 err_alloc:
 249         usb_put_hcd(hcd);
 250         return ret;
 251 }
 252
 253 static int __exit ehci_mxc_drv_remove(struct platform_device *pdev)
 254 {
 255         struct mxc_usbh_platform_data *pdata = pdev->dev.platform_data;
 256         struct ehci_mxc_priv *priv = platform_get_drvdata(pdev);
 257         struct usb_hcd *hcd = priv->hcd;
 258
 259         if (pdata && pdata->exit)
 260                 pdata->exit(pdev);
 261
 262         if (pdata->otg)
 263                 usb_phy_shutdown(pdata->otg);
 264
 265         usb_remove_hcd(hcd);
 266         usb_put_hcd(hcd);
 267         platform_set_drvdata(pdev, NULL);
 268
 269         clk_disable_unprepare(priv->usbclk);
 270         clk_disable_unprepare(priv->ahbclk);
 271
 272         if (priv->phyclk)
 273                 clk_disable_unprepare(priv->phyclk);
 274
 275         return 0;
 276 }
 277
 278 static void ehci_mxc_drv_shutdown(struct platform_device *pdev)
 279 {
 280         struct ehci_mxc_priv *priv = platform_get_drvdata(pdev);
 281         struct usb_hcd *hcd = priv->hcd;
 282
 283         if (hcd->driver->shutdown)
 284                 hcd->driver->shutdown(hcd);
 285 }
 286
 287 MODULE_ALIAS("platform:mxc-ehci");
 288
 289 static struct platform_driver ehci_mxc_driver = {
 290         .probe = ehci_mxc_drv_probe,
 291         .remove = __exit_p(ehci_mxc_drv_remove),
 292         .shutdown = ehci_mxc_drv_shutdown,
 293         .driver = {
 294                    .name = "mxc-ehci",
 295         },
 296 };