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/slab.h>
  25
  26 #include <mach/mxc_ehci.h>
  27
  28 #define ULPI_VIEWPORT_OFFSET    0x170
  29 #define PORTSC_OFFSET           0x184
  30 #define USBMODE_OFFSET          0x1a8
  31 #define USBMODE_CM_HOST         3
  32
  33 struct ehci_mxc_priv {
  34         struct clk *usbclk, *ahbclk;
  35         struct usb_hcd *hcd;
  36 };
  37
  38 /* called during probe() after chip reset completes */
  39 static int ehci_mxc_setup(struct usb_hcd *hcd)
  40 {
  41         struct ehci_hcd *ehci = hcd_to_ehci(hcd);
  42         int retval;
  43
  44         /* EHCI registers start at offset 0x100 */
  45         ehci->caps = hcd->regs + 0x100;
  46         ehci->regs = hcd->regs + 0x100 +
  47             HC_LENGTH(ehci_readl(ehci, &ehci->caps->hc_capbase));
  48         dbg_hcs_params(ehci, "reset");
  49         dbg_hcc_params(ehci, "reset");
  50
  51         /* cache this readonly data; minimize chip reads */
  52         ehci->hcs_params = ehci_readl(ehci, &ehci->caps->hcs_params);
  53
  54         retval = ehci_halt(ehci);
  55         if (retval)
  56                 return retval;
  57
  58         /* data structure init */
  59         retval = ehci_init(hcd);
  60         if (retval)
  61                 return retval;
  62
  63         hcd->has_tt = 1;
  64
  65         ehci->sbrn = 0x20;
  66
  67         ehci_reset(ehci);
  68
  69         ehci_port_power(ehci, 0);
  70         return 0;
  71 }
  72
  73 static const struct hc_driver ehci_mxc_hc_driver = {
  74         .description = hcd_name,
  75         .product_desc = "Freescale On-Chip EHCI Host Controller",
  76         .hcd_priv_size = sizeof(struct ehci_hcd),
  77
  78         /*
  79          * generic hardware linkage
  80          */
  81         .irq = ehci_irq,
  82         .flags = HCD_USB2 | HCD_MEMORY,
  83
  84         /*
  85          * basic lifecycle operations
  86          */
  87         .reset = ehci_mxc_setup,
  88         .start = ehci_run,
  89         .stop = ehci_stop,
  90         .shutdown = ehci_shutdown,
  91
  92         /*
  93          * managing i/o requests and associated device resources
  94          */
  95         .urb_enqueue = ehci_urb_enqueue,
  96         .urb_dequeue = ehci_urb_dequeue,
  97         .endpoint_disable = ehci_endpoint_disable,
  98
  99         /*
 100          * scheduling support
 101          */
 102         .get_frame_number = ehci_get_frame,
 103
 104         /*
 105          * root hub support
 106          */
 107         .hub_status_data = ehci_hub_status_data,
 108         .hub_control = ehci_hub_control,
 109         .bus_suspend = ehci_bus_suspend,
 110         .bus_resume = ehci_bus_resume,
 111         .relinquish_port = ehci_relinquish_port,
 112         .port_handed_over = ehci_port_handed_over,
 113 };
 114
 115 static int ehci_mxc_drv_probe(struct platform_device *pdev)
 116 {
 117         struct mxc_usbh_platform_data *pdata = pdev->dev.platform_data;
 118         struct usb_hcd *hcd;
 119         struct resource *res;
 120         int irq, ret, temp;
 121         struct ehci_mxc_priv *priv;
 122         struct device *dev = &pdev->dev;
 123
 124         dev_info(&pdev->dev, "initializing i.MX USB Controller\n");
 125
 126         if (!pdata) {
 127                 dev_err(dev, "No platform data given, bailing out.\n");
 128                 return -EINVAL;
 129         }
 130
 131         irq = platform_get_irq(pdev, 0);
 132
 133         hcd = usb_create_hcd(&ehci_mxc_hc_driver, dev, dev_name(dev));
 134         if (!hcd)
 135                 return -ENOMEM;
 136
 137         priv = kzalloc(sizeof(*priv), GFP_KERNEL);
 138         if (!priv) {
 139                 ret = -ENOMEM;
 140                 goto err_alloc;
 141         }
 142
 143         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 144         if (!res) {
 145                 dev_err(dev, "Found HC with no register addr. Check setup!\n");
 146                 ret = -ENODEV;
 147                 goto err_get_resource;
 148         }
 149
 150         hcd->rsrc_start = res->start;
 151         hcd->rsrc_len = resource_size(res);
 152
 153         if (!request_mem_region(hcd->rsrc_start, hcd->rsrc_len, hcd_name)) {
 154                 dev_dbg(dev, "controller already in use\n");
 155                 ret = -EBUSY;
 156                 goto err_request_mem;
 157         }
 158
 159         hcd->regs = ioremap(hcd->rsrc_start, hcd->rsrc_len);
 160         if (!hcd->regs) {
 161                 dev_err(dev, "error mapping memory\n");
 162                 ret = -EFAULT;
 163                 goto err_ioremap;
 164         }
 165
 166         /* call platform specific init function */
 167         if (pdata->init) {
 168                 ret = pdata->init(pdev);
 169                 if (ret) {
 170                         dev_err(dev, "platform init failed\n");
 171                         goto err_init;
 172                 }
 173                 /* platforms need some time to settle changed IO settings */
 174                 mdelay(10);
 175         }
 176
 177         /* enable clocks */
 178         priv->usbclk = clk_get(dev, "usb");
 179         if (IS_ERR(priv->usbclk)) {
 180                 ret = PTR_ERR(priv->usbclk);
 181                 goto err_clk;
 182         }
 183         clk_enable(priv->usbclk);
 184
 185         if (!cpu_is_mx35()) {
 186                 priv->ahbclk = clk_get(dev, "usb_ahb");
 187                 if (IS_ERR(priv->ahbclk)) {
 188                         ret = PTR_ERR(priv->ahbclk);
 189                         goto err_clk_ahb;
 190                 }
 191                 clk_enable(priv->ahbclk);
 192         }
 193
 194         /* set USBMODE to host mode */
 195         temp = readl(hcd->regs + USBMODE_OFFSET);
 196         writel(temp | USBMODE_CM_HOST, hcd->regs + USBMODE_OFFSET);
 197
 198         /* set up the PORTSCx register */
 199         writel(pdata->portsc, hcd->regs + PORTSC_OFFSET);
 200         mdelay(10);
 201
 202         /* setup specific usb hw */
 203         ret = mxc_initialize_usb_hw(pdev->id, pdata->flags);
 204         if (ret < 0)
 205                 goto err_init;
 206
 207         /* Initialize the transceiver */
 208         if (pdata->otg) {
 209                 pdata->otg->io_priv = hcd->regs + ULPI_VIEWPORT_OFFSET;
 210                 ret = otg_init(pdata->otg);
 211                 if (ret) {
 212                         dev_err(dev, "unable to init transceiver, probably missing\n");
 213                         ret = -ENODEV;
 214                         goto err_add;
 215                 }
 216                 ret = otg_set_vbus(pdata->otg, 1);
 217                 if (ret) {
 218                         dev_err(dev, "unable to enable vbus on transceiver\n");
 219                         goto err_add;
 220                 }
 221         }
 222
 223         priv->hcd = hcd;
 224         platform_set_drvdata(pdev, priv);
 225
 226         ret = usb_add_hcd(hcd, irq, IRQF_DISABLED | IRQF_SHARED);
 227         if (ret)
 228                 goto err_add;
 229
 230         return 0;
 231
 232 err_add:
 233         if (pdata && pdata->exit)
 234                 pdata->exit(pdev);
 235 err_init:
 236         if (priv->ahbclk) {
 237                 clk_disable(priv->ahbclk);
 238                 clk_put(priv->ahbclk);
 239         }
 240 err_clk_ahb:
 241         clk_disable(priv->usbclk);
 242         clk_put(priv->usbclk);
 243 err_clk:
 244         iounmap(hcd->regs);
 245 err_ioremap:
 246         release_mem_region(hcd->rsrc_start, hcd->rsrc_len);
 247 err_request_mem:
 248 err_get_resource:
 249         kfree(priv);
 250 err_alloc:
 251         usb_put_hcd(hcd);
 252         return ret;
 253 }
 254
 255 static int __exit ehci_mxc_drv_remove(struct platform_device *pdev)
 256 {
 257         struct mxc_usbh_platform_data *pdata = pdev->dev.platform_data;
 258         struct ehci_mxc_priv *priv = platform_get_drvdata(pdev);
 259         struct usb_hcd *hcd = priv->hcd;
 260
 261         if (pdata && pdata->exit)
 262                 pdata->exit(pdev);
 263
 264         if (pdata->otg)
 265                 otg_shutdown(pdata->otg);
 266
 267         usb_remove_hcd(hcd);
 268         iounmap(hcd->regs);
 269         release_mem_region(hcd->rsrc_start, hcd->rsrc_len);
 270         usb_put_hcd(hcd);
 271         platform_set_drvdata(pdev, NULL);
 272
 273         clk_disable(priv->usbclk);
 274         clk_put(priv->usbclk);
 275         if (priv->ahbclk) {
 276                 clk_disable(priv->ahbclk);
 277                 clk_put(priv->ahbclk);
 278         }
 279
 280         kfree(priv);
 281
 282         return 0;
 283 }
 284
 285 static void ehci_mxc_drv_shutdown(struct platform_device *pdev)
 286 {
 287         struct ehci_mxc_priv *priv = platform_get_drvdata(pdev);
 288         struct usb_hcd *hcd = priv->hcd;
 289
 290         if (hcd->driver->shutdown)
 291                 hcd->driver->shutdown(hcd);
 292 }
 293
 294 MODULE_ALIAS("platform:mxc-ehci");
 295
 296 static struct platform_driver ehci_mxc_driver = {
 297         .probe = ehci_mxc_drv_probe,
 298         .remove = __exit_p(ehci_mxc_drv_remove),
 299         .shutdown = ehci_mxc_drv_shutdown,
 300         .driver = {
 301                    .name = "mxc-ehci",
 302         },
 303 };