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, *phy1clk;
  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, "usb");
 170         if (IS_ERR(priv->usbclk)) {
 171                 ret = PTR_ERR(priv->usbclk);
 172                 goto err_clk;
 173         }
 174         clk_enable(priv->usbclk);
 175
 176         if (!cpu_is_mx35() && !cpu_is_mx25()) {
 177                 priv->ahbclk = clk_get(dev, "usb_ahb");
 178                 if (IS_ERR(priv->ahbclk)) {
 179                         ret = PTR_ERR(priv->ahbclk);
 180                         goto err_clk_ahb;
 181                 }
 182                 clk_enable(priv->ahbclk);
 183         }
 184
 185         /* "dr" device has its own clock on i.MX51 */
 186         if (cpu_is_mx51() && (pdev->id == 0)) {
 187                 priv->phy1clk = clk_get(dev, "usb_phy1");
 188                 if (IS_ERR(priv->phy1clk)) {
 189                         ret = PTR_ERR(priv->phy1clk);
 190                         goto err_clk_phy;
 191                 }
 192                 clk_enable(priv->phy1clk);
 193         }
 194
 195
 196         /* call platform specific init function */
 197         if (pdata->init) {
 198                 ret = pdata->init(pdev);
 199                 if (ret) {
 200                         dev_err(dev, "platform init failed\n");
 201                         goto err_init;
 202                 }
 203                 /* platforms need some time to settle changed IO settings */
 204                 mdelay(10);
 205         }
 206
 207         ehci = hcd_to_ehci(hcd);
 208
 209         /* EHCI registers start at offset 0x100 */
 210         ehci->caps = hcd->regs + 0x100;
 211         ehci->regs = hcd->regs + 0x100 +
 212                 HC_LENGTH(ehci, ehci_readl(ehci, &ehci->caps->hc_capbase));
 213
 214         /* set up the PORTSCx register */
 215         ehci_writel(ehci, pdata->portsc, &ehci->regs->port_status[0]);
 216
 217         /* is this really needed? */
 218         msleep(10);
 219
 220         /* Initialize the transceiver */
 221         if (pdata->otg) {
 222                 pdata->otg->io_priv = hcd->regs + ULPI_VIEWPORT_OFFSET;
 223                 ret = otg_init(pdata->otg);
 224                 if (ret) {
 225                         dev_err(dev, "unable to init transceiver, probably missing\n");
 226                         ret = -ENODEV;
 227                         goto err_add;
 228                 }
 229                 ret = otg_set_vbus(pdata->otg, 1);
 230                 if (ret) {
 231                         dev_err(dev, "unable to enable vbus on transceiver\n");
 232                         goto err_add;
 233                 }
 234         }
 235
 236         priv->hcd = hcd;
 237         platform_set_drvdata(pdev, priv);
 238
 239         ret = usb_add_hcd(hcd, irq, IRQF_SHARED);
 240         if (ret)
 241                 goto err_add;
 242
 243         if (pdata->otg) {
 244                 /*
 245                  * efikamx and efikasb have some hardware bug which is
 246                  * preventing usb to work unless CHRGVBUS is set.
 247                  * It's in violation of USB specs
 248                  */
 249                 if (machine_is_mx51_efikamx() || machine_is_mx51_efikasb()) {
 250                         flags = otg_io_read(pdata->otg, ULPI_OTG_CTRL);
 251                         flags |= ULPI_OTG_CTRL_CHRGVBUS;
 252                         ret = otg_io_write(pdata->otg, flags, ULPI_OTG_CTRL);
 253                         if (ret) {
 254                                 dev_err(dev, "unable to set CHRVBUS\n");
 255                                 goto err_add;
 256                         }
 257                 }
 258         }
 259
 260         return 0;
 261
 262 err_add:
 263         if (pdata && pdata->exit)
 264                 pdata->exit(pdev);
 265 err_init:
 266         if (priv->phy1clk) {
 267                 clk_disable(priv->phy1clk);
 268                 clk_put(priv->phy1clk);
 269         }
 270 err_clk_phy:
 271         if (priv->ahbclk) {
 272                 clk_disable(priv->ahbclk);
 273                 clk_put(priv->ahbclk);
 274         }
 275 err_clk_ahb:
 276         clk_disable(priv->usbclk);
 277         clk_put(priv->usbclk);
 278 err_clk:
 279         iounmap(hcd->regs);
 280 err_ioremap:
 281         release_mem_region(hcd->rsrc_start, hcd->rsrc_len);
 282 err_request_mem:
 283 err_get_resource:
 284         kfree(priv);
 285 err_alloc:
 286         usb_put_hcd(hcd);
 287         return ret;
 288 }
 289
 290 static int __exit ehci_mxc_drv_remove(struct platform_device *pdev)
 291 {
 292         struct mxc_usbh_platform_data *pdata = pdev->dev.platform_data;
 293         struct ehci_mxc_priv *priv = platform_get_drvdata(pdev);
 294         struct usb_hcd *hcd = priv->hcd;
 295
 296         if (pdata && pdata->exit)
 297                 pdata->exit(pdev);
 298
 299         if (pdata->otg)
 300                 otg_shutdown(pdata->otg);
 301
 302         usb_remove_hcd(hcd);
 303         iounmap(hcd->regs);
 304         release_mem_region(hcd->rsrc_start, hcd->rsrc_len);
 305         usb_put_hcd(hcd);
 306         platform_set_drvdata(pdev, NULL);
 307
 308         clk_disable(priv->usbclk);
 309         clk_put(priv->usbclk);
 310         if (priv->ahbclk) {
 311                 clk_disable(priv->ahbclk);
 312                 clk_put(priv->ahbclk);
 313         }
 314         if (priv->phy1clk) {
 315                 clk_disable(priv->phy1clk);
 316                 clk_put(priv->phy1clk);
 317         }
 318
 319         kfree(priv);
 320
 321         return 0;
 322 }
 323
 324 static void ehci_mxc_drv_shutdown(struct platform_device *pdev)
 325 {
 326         struct ehci_mxc_priv *priv = platform_get_drvdata(pdev);
 327         struct usb_hcd *hcd = priv->hcd;
 328
 329         if (hcd->driver->shutdown)
 330                 hcd->driver->shutdown(hcd);
 331 }
 332
 333 MODULE_ALIAS("platform:mxc-ehci");
 334
 335 static struct platform_driver ehci_mxc_driver = {
 336         .probe = ehci_mxc_drv_probe,
 337         .remove = __exit_p(ehci_mxc_drv_remove),
 338         .shutdown = ehci_mxc_drv_shutdown,
 339         .driver = {
 340                    .name = "mxc-ehci",
 341         },
 342 };