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
  25 #include <mach/mxc_ehci.h>
  26
  27 #define ULPI_VIEWPORT_OFFSET    0x170
  28 #define PORTSC_OFFSET           0x184
  29 #define USBMODE_OFFSET          0x1a8
  30 #define USBMODE_CM_HOST         3
  31
  32 struct ehci_mxc_priv {
  33         struct clk *usbclk, *ahbclk;
  34         struct usb_hcd *hcd;
  35 };
  36
  37 /* called during probe() after chip reset completes */
  38 static int ehci_mxc_setup(struct usb_hcd *hcd)
  39 {
  40         struct ehci_hcd *ehci = hcd_to_ehci(hcd);
  41         int retval;
  42
  43         /* EHCI registers start at offset 0x100 */
  44         ehci->caps = hcd->regs + 0x100;
  45         ehci->regs = hcd->regs + 0x100 +
  46             HC_LENGTH(ehci_readl(ehci, &ehci->caps->hc_capbase));
  47         dbg_hcs_params(ehci, "reset");
  48         dbg_hcc_params(ehci, "reset");
  49
  50         /* cache this readonly data; minimize chip reads */
  51         ehci->hcs_params = ehci_readl(ehci, &ehci->caps->hcs_params);
  52
  53         retval = ehci_halt(ehci);
  54         if (retval)
  55                 return retval;
  56
  57         /* data structure init */
  58         retval = ehci_init(hcd);
  59         if (retval)
  60                 return retval;
  61
  62         hcd->has_tt = 1;
  63
  64         ehci->sbrn = 0x20;
  65
  66         ehci_reset(ehci);
  67
  68         ehci_port_power(ehci, 0);
  69         return 0;
  70 }
  71
  72 static const struct hc_driver ehci_mxc_hc_driver = {
  73         .description = hcd_name,
  74         .product_desc = "Freescale On-Chip EHCI Host Controller",
  75         .hcd_priv_size = sizeof(struct ehci_hcd),
  76
  77         /*
  78          * generic hardware linkage
  79          */
  80         .irq = ehci_irq,
  81         .flags = HCD_USB2 | HCD_MEMORY,
  82
  83         /*
  84          * basic lifecycle operations
  85          */
  86         .reset = ehci_mxc_setup,
  87         .start = ehci_run,
  88         .stop = ehci_stop,
  89         .shutdown = ehci_shutdown,
  90
  91         /*
  92          * managing i/o requests and associated device resources
  93          */
  94         .urb_enqueue = ehci_urb_enqueue,
  95         .urb_dequeue = ehci_urb_dequeue,
  96         .endpoint_disable = ehci_endpoint_disable,
  97
  98         /*
  99          * scheduling support
 100          */
 101         .get_frame_number = ehci_get_frame,
 102
 103         /*
 104          * root hub support
 105          */
 106         .hub_status_data = ehci_hub_status_data,
 107         .hub_control = ehci_hub_control,
 108         .bus_suspend = ehci_bus_suspend,
 109         .bus_resume = ehci_bus_resume,
 110         .relinquish_port = ehci_relinquish_port,
 111         .port_handed_over = ehci_port_handed_over,
 112 };
 113
 114 static int ehci_mxc_drv_probe(struct platform_device *pdev)
 115 {
 116         struct mxc_usbh_platform_data *pdata = pdev->dev.platform_data;
 117         struct usb_hcd *hcd;
 118         struct resource *res;
 119         int irq, ret, temp;
 120         struct ehci_mxc_priv *priv;
 121         struct device *dev = &pdev->dev;
 122
 123         dev_info(&pdev->dev, "initializing i.MX USB Controller\n");
 124
 125         if (!pdata) {
 126                 dev_err(dev, "No platform data given, bailing out.\n");
 127                 return -EINVAL;
 128         }
 129
 130         irq = platform_get_irq(pdev, 0);
 131
 132         hcd = usb_create_hcd(&ehci_mxc_hc_driver, dev, dev_name(dev));
 133         if (!hcd)
 134                 return -ENOMEM;
 135
 136         priv = kzalloc(sizeof(*priv), GFP_KERNEL);
 137         if (!priv) {
 138                 ret = -ENOMEM;
 139                 goto err_alloc;
 140         }
 141
 142         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 143         if (!res) {
 144                 dev_err(dev, "Found HC with no register addr. Check setup!\n");
 145                 ret = -ENODEV;
 146                 goto err_get_resource;
 147         }
 148
 149         hcd->rsrc_start = res->start;
 150         hcd->rsrc_len = resource_size(res);
 151
 152         if (!request_mem_region(hcd->rsrc_start, hcd->rsrc_len, hcd_name)) {
 153                 dev_dbg(dev, "controller already in use\n");
 154                 ret = -EBUSY;
 155                 goto err_request_mem;
 156         }
 157
 158         hcd->regs = ioremap(hcd->rsrc_start, hcd->rsrc_len);
 159         if (!hcd->regs) {
 160                 dev_err(dev, "error mapping memory\n");
 161                 ret = -EFAULT;
 162                 goto err_ioremap;
 163         }
 164
 165         /* enable clocks */
 166         priv->usbclk = clk_get(dev, "usb");
 167         if (IS_ERR(priv->usbclk)) {
 168                 ret = PTR_ERR(priv->usbclk);
 169                 goto err_clk;
 170         }
 171         clk_enable(priv->usbclk);
 172
 173         if (!cpu_is_mx35()) {
 174                 priv->ahbclk = clk_get(dev, "usb_ahb");
 175                 if (IS_ERR(priv->ahbclk)) {
 176                         ret = PTR_ERR(priv->ahbclk);
 177                         goto err_clk_ahb;
 178                 }
 179                 clk_enable(priv->ahbclk);
 180         }
 181
 182         /* set USBMODE to host mode */
 183         temp = readl(hcd->regs + USBMODE_OFFSET);
 184         writel(temp | USBMODE_CM_HOST, hcd->regs + USBMODE_OFFSET);
 185
 186         /* set up the PORTSCx register */
 187         writel(pdata->portsc, hcd->regs + PORTSC_OFFSET);
 188         mdelay(10);
 189
 190         /* setup USBCONTROL. */
 191         ret = mxc_set_usbcontrol(pdev->id, pdata->flags);
 192         if (ret < 0)
 193                 goto err_init;
 194
 195         /* call platform specific init function */
 196         if (pdata->init) {
 197                 ret = pdata->init(pdev);
 198                 if (ret) {
 199                         dev_err(dev, "platform init failed\n");
 200                         goto err_init;
 201                 }
 202         }
 203
 204         /* most platforms need some time to settle changed IO settings */
 205         mdelay(10);
 206
 207         /* Initialize the transceiver */
 208         if (pdata->otg) {
 209                 pdata->otg->io_priv = hcd->regs + ULPI_VIEWPORT_OFFSET;
 210                 if (otg_init(pdata->otg) != 0)
 211                         dev_err(dev, "unable to init transceiver\n");
 212                 else if (otg_set_vbus(pdata->otg, 1) != 0)
 213                         dev_err(dev, "unable to enable vbus on transceiver\n");
 214         }
 215
 216         priv->hcd = hcd;
 217         platform_set_drvdata(pdev, priv);
 218
 219         ret = usb_add_hcd(hcd, irq, IRQF_DISABLED | IRQF_SHARED);
 220         if (ret)
 221                 goto err_add;
 222
 223         return 0;
 224
 225 err_add:
 226         if (pdata && pdata->exit)
 227                 pdata->exit(pdev);
 228 err_init:
 229         if (priv->ahbclk) {
 230                 clk_disable(priv->ahbclk);
 231                 clk_put(priv->ahbclk);
 232         }
 233 err_clk_ahb:
 234         clk_disable(priv->usbclk);
 235         clk_put(priv->usbclk);
 236 err_clk:
 237         iounmap(hcd->regs);
 238 err_ioremap:
 239         release_mem_region(hcd->rsrc_start, hcd->rsrc_len);
 240 err_request_mem:
 241 err_get_resource:
 242         kfree(priv);
 243 err_alloc:
 244         usb_put_hcd(hcd);
 245         return ret;
 246 }
 247
 248 static int __exit ehci_mxc_drv_remove(struct platform_device *pdev)
 249 {
 250         struct mxc_usbh_platform_data *pdata = pdev->dev.platform_data;
 251         struct ehci_mxc_priv *priv = platform_get_drvdata(pdev);
 252         struct usb_hcd *hcd = priv->hcd;
 253
 254         if (pdata && pdata->exit)
 255                 pdata->exit(pdev);
 256
 257         if (pdata->otg)
 258                 otg_shutdown(pdata->otg);
 259
 260         usb_remove_hcd(hcd);
 261         iounmap(hcd->regs);
 262         release_mem_region(hcd->rsrc_start, hcd->rsrc_len);
 263         usb_put_hcd(hcd);
 264         platform_set_drvdata(pdev, NULL);
 265
 266         clk_disable(priv->usbclk);
 267         clk_put(priv->usbclk);
 268         if (priv->ahbclk) {
 269                 clk_disable(priv->ahbclk);
 270                 clk_put(priv->ahbclk);
 271         }
 272
 273         kfree(priv);
 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 };