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 <mach/mxc_ehci.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         dbg_hcs_params(ehci, "reset");
  46         dbg_hcc_params(ehci, "reset");
  47
  48         /* cache this readonly data; minimize chip reads */
  49         ehci->hcs_params = ehci_readl(ehci, &ehci->caps->hcs_params);
  50
  51         hcd->has_tt = 1;
  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         ehci->sbrn = 0x20;
  63
  64         ehci_reset(ehci);
  65
  66         ehci_port_power(ehci, 0);
  67         return 0;
  68 }
  69
  70 static const struct hc_driver ehci_mxc_hc_driver = {
  71         .description = hcd_name,
  72         .product_desc = "Freescale On-Chip EHCI Host Controller",
  73         .hcd_priv_size = sizeof(struct ehci_hcd),
  74
  75         /*
  76          * generic hardware linkage
  77          */
  78         .irq = ehci_irq,
  79         .flags = HCD_USB2 | HCD_MEMORY,
  80
  81         /*
  82          * basic lifecycle operations
  83          */
  84         .reset = ehci_mxc_setup,
  85         .start = ehci_run,
  86         .stop = ehci_stop,
  87         .shutdown = ehci_shutdown,
  88
  89         /*
  90          * managing i/o requests and associated device resources
  91          */
  92         .urb_enqueue = ehci_urb_enqueue,
  93         .urb_dequeue = ehci_urb_dequeue,
  94         .endpoint_disable = ehci_endpoint_disable,
  95         .endpoint_reset = ehci_endpoint_reset,
  96
  97         /*
  98          * scheduling support
  99          */
 100         .get_frame_number = ehci_get_frame,
 101
 102         /*
 103          * root hub support
 104          */
 105         .hub_status_data = ehci_hub_status_data,
 106         .hub_control = ehci_hub_control,
 107         .bus_suspend = ehci_bus_suspend,
 108         .bus_resume = ehci_bus_resume,
 109         .relinquish_port = ehci_relinquish_port,
 110         .port_handed_over = ehci_port_handed_over,
 111
 112         .clear_tt_buffer_complete = ehci_clear_tt_buffer_complete,
 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;
 121         unsigned int flags;
 122         struct ehci_mxc_priv *priv;
 123         struct device *dev = &pdev->dev;
 124         struct ehci_hcd *ehci;
 125
 126         dev_info(&pdev->dev, "initializing i.MX USB Controller\n");
 127
 128         if (!pdata) {
 129                 dev_err(dev, "No platform data given, bailing out.\n");
 130                 return -EINVAL;
 131         }
 132
 133         irq = platform_get_irq(pdev, 0);
 134
 135         hcd = usb_create_hcd(&ehci_mxc_hc_driver, dev, dev_name(dev));
 136         if (!hcd)
 137                 return -ENOMEM;
 138
 139         priv = kzalloc(sizeof(*priv), GFP_KERNEL);
 140         if (!priv) {
 141                 ret = -ENOMEM;
 142                 goto err_alloc;
 143         }
 144
 145         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 146         if (!res) {
 147                 dev_err(dev, "Found HC with no register addr. Check setup!\n");
 148                 ret = -ENODEV;
 149                 goto err_get_resource;
 150         }
 151
 152         hcd->rsrc_start = res->start;
 153         hcd->rsrc_len = resource_size(res);
 154
 155         if (!request_mem_region(hcd->rsrc_start, hcd->rsrc_len, hcd_name)) {
 156                 dev_dbg(dev, "controller already in use\n");
 157                 ret = -EBUSY;
 158                 goto err_request_mem;
 159         }
 160
 161         hcd->regs = ioremap(hcd->rsrc_start, hcd->rsrc_len);
 162         if (!hcd->regs) {
 163                 dev_err(dev, "error mapping memory\n");
 164                 ret = -EFAULT;
 165                 goto err_ioremap;
 166         }
 167
 168         /* enable clocks */
 169         priv->usbclk = clk_get(dev, "ipg");
 170         if (IS_ERR(priv->usbclk)) {
 171                 ret = PTR_ERR(priv->usbclk);
 172                 goto err_clk;
 173         }
 174         clk_prepare_enable(priv->usbclk);
 175
 176         priv->ahbclk = clk_get(dev, "ahb");
 177         if (IS_ERR(priv->ahbclk)) {
 178                 ret = PTR_ERR(priv->ahbclk);
 179                 goto err_clk_ahb;
 180         }
 181         clk_prepare_enable(priv->ahbclk);
 182
 183         /* "dr" device has its own clock on i.MX51 */
 184         priv->phyclk = clk_get(dev, "phy");
 185         if (IS_ERR(priv->phyclk))
 186                 priv->phyclk = NULL;
 187         if (priv->phyclk)
 188                 clk_prepare_enable(priv->phyclk);
 189
 190
 191         /* call platform specific init function */
 192         if (pdata->init) {
 193                 ret = pdata->init(pdev);
 194                 if (ret) {
 195                         dev_err(dev, "platform init failed\n");
 196                         goto err_init;
 197                 }
 198                 /* platforms need some time to settle changed IO settings */
 199                 mdelay(10);
 200         }
 201
 202         ehci = hcd_to_ehci(hcd);
 203
 204         /* EHCI registers start at offset 0x100 */
 205         ehci->caps = hcd->regs + 0x100;
 206         ehci->regs = hcd->regs + 0x100 +
 207                 HC_LENGTH(ehci, ehci_readl(ehci, &ehci->caps->hc_capbase));
 208
 209         /* set up the PORTSCx register */
 210         ehci_writel(ehci, pdata->portsc, &ehci->regs->port_status[0]);
 211
 212         /* is this really needed? */
 213         msleep(10);
 214
 215         /* Initialize the transceiver */
 216         if (pdata->otg) {
 217                 pdata->otg->io_priv = hcd->regs + ULPI_VIEWPORT_OFFSET;
 218                 ret = usb_phy_init(pdata->otg);
 219                 if (ret) {
 220                         dev_err(dev, "unable to init transceiver, probably missing\n");
 221                         ret = -ENODEV;
 222                         goto err_add;
 223                 }
 224                 ret = otg_set_vbus(pdata->otg->otg, 1);
 225                 if (ret) {
 226                         dev_err(dev, "unable to enable vbus on transceiver\n");
 227                         goto err_add;
 228                 }
 229         }
 230
 231         priv->hcd = hcd;
 232         platform_set_drvdata(pdev, priv);
 233
 234         ret = usb_add_hcd(hcd, irq, IRQF_SHARED);
 235         if (ret)
 236                 goto err_add;
 237
 238         if (pdata->otg) {
 239                 /*
 240                  * efikamx and efikasb have some hardware bug which is
 241                  * preventing usb to work unless CHRGVBUS is set.
 242                  * It's in violation of USB specs
 243                  */
 244                 if (machine_is_mx51_efikamx() || machine_is_mx51_efikasb()) {
 245                         flags = usb_phy_io_read(pdata->otg,
 246                                                         ULPI_OTG_CTRL);
 247                         flags |= ULPI_OTG_CTRL_CHRGVBUS;
 248                         ret = usb_phy_io_write(pdata->otg, flags,
 249                                                         ULPI_OTG_CTRL);
 250                         if (ret) {
 251                                 dev_err(dev, "unable to set CHRVBUS\n");
 252                                 goto err_add;
 253                         }
 254                 }
 255         }
 256
 257         return 0;
 258
 259 err_add:
 260         if (pdata && pdata->exit)
 261                 pdata->exit(pdev);
 262 err_init:
 263         if (priv->phyclk) {
 264                 clk_disable_unprepare(priv->phyclk);
 265                 clk_put(priv->phyclk);
 266         }
 267
 268         clk_disable_unprepare(priv->ahbclk);
 269         clk_put(priv->ahbclk);
 270 err_clk_ahb:
 271         clk_disable_unprepare(priv->usbclk);
 272         clk_put(priv->usbclk);
 273 err_clk:
 274         iounmap(hcd->regs);
 275 err_ioremap:
 276         release_mem_region(hcd->rsrc_start, hcd->rsrc_len);
 277 err_request_mem:
 278 err_get_resource:
 279         kfree(priv);
 280 err_alloc:
 281         usb_put_hcd(hcd);
 282         return ret;
 283 }
 284
 285 static int __exit ehci_mxc_drv_remove(struct platform_device *pdev)
 286 {
 287         struct mxc_usbh_platform_data *pdata = pdev->dev.platform_data;
 288         struct ehci_mxc_priv *priv = platform_get_drvdata(pdev);
 289         struct usb_hcd *hcd = priv->hcd;
 290
 291         if (pdata && pdata->exit)
 292                 pdata->exit(pdev);
 293
 294         if (pdata->otg)
 295                 usb_phy_shutdown(pdata->otg);
 296
 297         usb_remove_hcd(hcd);
 298         iounmap(hcd->regs);
 299         release_mem_region(hcd->rsrc_start, hcd->rsrc_len);
 300         usb_put_hcd(hcd);
 301         platform_set_drvdata(pdev, NULL);
 302
 303         clk_disable_unprepare(priv->usbclk);
 304         clk_put(priv->usbclk);
 305         clk_disable_unprepare(priv->ahbclk);
 306         clk_put(priv->ahbclk);
 307
 308         if (priv->phyclk) {
 309                 clk_disable_unprepare(priv->phyclk);
 310                 clk_put(priv->phyclk);
 311         }
 312
 313         kfree(priv);
 314
 315         return 0;
 316 }
 317
 318 static void ehci_mxc_drv_shutdown(struct platform_device *pdev)
 319 {
 320         struct ehci_mxc_priv *priv = platform_get_drvdata(pdev);
 321         struct usb_hcd *hcd = priv->hcd;
 322
 323         if (hcd->driver->shutdown)
 324                 hcd->driver->shutdown(hcd);
 325 }
 326
 327 MODULE_ALIAS("platform:mxc-ehci");
 328
 329 static struct platform_driver ehci_mxc_driver = {
 330         .probe = ehci_mxc_drv_probe,
 331         .remove = __exit_p(ehci_mxc_drv_remove),
 332         .shutdown = ehci_mxc_drv_shutdown,
 333         .driver = {
 334                    .name = "mxc-ehci",
 335         },
 336 };