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
  30 struct ehci_mxc_priv {
  31         struct clk *usbclk, *ahbclk;
  32         struct usb_hcd *hcd;
  33 };
  34
  35 /* called during probe() after chip reset completes */
  36 static int ehci_mxc_setup(struct usb_hcd *hcd)
  37 {
  38         struct ehci_hcd *ehci = hcd_to_ehci(hcd);
  39         int retval;
  40
  41         dbg_hcs_params(ehci, "reset");
  42         dbg_hcc_params(ehci, "reset");
  43
  44         /* cache this readonly data; minimize chip reads */
  45         ehci->hcs_params = ehci_readl(ehci, &ehci->caps->hcs_params);
  46
  47         hcd->has_tt = 1;
  48
  49         retval = ehci_halt(ehci);
  50         if (retval)
  51                 return retval;
  52
  53         /* data structure init */
  54         retval = ehci_init(hcd);
  55         if (retval)
  56                 return retval;
  57
  58         ehci->sbrn = 0x20;
  59
  60         ehci_reset(ehci);
  61
  62         ehci_port_power(ehci, 0);
  63         return 0;
  64 }
  65
  66 static const struct hc_driver ehci_mxc_hc_driver = {
  67         .description = hcd_name,
  68         .product_desc = "Freescale On-Chip EHCI Host Controller",
  69         .hcd_priv_size = sizeof(struct ehci_hcd),
  70
  71         /*
  72          * generic hardware linkage
  73          */
  74         .irq = ehci_irq,
  75         .flags = HCD_USB2 | HCD_MEMORY,
  76
  77         /*
  78          * basic lifecycle operations
  79          */
  80         .reset = ehci_mxc_setup,
  81         .start = ehci_run,
  82         .stop = ehci_stop,
  83         .shutdown = ehci_shutdown,
  84
  85         /*
  86          * managing i/o requests and associated device resources
  87          */
  88         .urb_enqueue = ehci_urb_enqueue,
  89         .urb_dequeue = ehci_urb_dequeue,
  90         .endpoint_disable = ehci_endpoint_disable,
  91         .endpoint_reset = ehci_endpoint_reset,
  92
  93         /*
  94          * scheduling support
  95          */
  96         .get_frame_number = ehci_get_frame,
  97
  98         /*
  99          * root hub support
 100          */
 101         .hub_status_data = ehci_hub_status_data,
 102         .hub_control = ehci_hub_control,
 103         .bus_suspend = ehci_bus_suspend,
 104         .bus_resume = ehci_bus_resume,
 105         .relinquish_port = ehci_relinquish_port,
 106         .port_handed_over = ehci_port_handed_over,
 107
 108         .clear_tt_buffer_complete = ehci_clear_tt_buffer_complete,
 109 };
 110
 111 static int ehci_mxc_drv_probe(struct platform_device *pdev)
 112 {
 113         struct mxc_usbh_platform_data *pdata = pdev->dev.platform_data;
 114         struct usb_hcd *hcd;
 115         struct resource *res;
 116         int irq, ret;
 117         struct ehci_mxc_priv *priv;
 118         struct device *dev = &pdev->dev;
 119         struct ehci_hcd *ehci;
 120
 121         dev_info(&pdev->dev, "initializing i.MX USB Controller\n");
 122
 123         if (!pdata) {
 124                 dev_err(dev, "No platform data given, bailing out.\n");
 125                 return -EINVAL;
 126         }
 127
 128         irq = platform_get_irq(pdev, 0);
 129
 130         hcd = usb_create_hcd(&ehci_mxc_hc_driver, dev, dev_name(dev));
 131         if (!hcd)
 132                 return -ENOMEM;
 133
 134         priv = kzalloc(sizeof(*priv), GFP_KERNEL);
 135         if (!priv) {
 136                 ret = -ENOMEM;
 137                 goto err_alloc;
 138         }
 139
 140         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 141         if (!res) {
 142                 dev_err(dev, "Found HC with no register addr. Check setup!\n");
 143                 ret = -ENODEV;
 144                 goto err_get_resource;
 145         }
 146
 147         hcd->rsrc_start = res->start;
 148         hcd->rsrc_len = resource_size(res);
 149
 150         if (!request_mem_region(hcd->rsrc_start, hcd->rsrc_len, hcd_name)) {
 151                 dev_dbg(dev, "controller already in use\n");
 152                 ret = -EBUSY;
 153                 goto err_request_mem;
 154         }
 155
 156         hcd->regs = ioremap(hcd->rsrc_start, hcd->rsrc_len);
 157         if (!hcd->regs) {
 158                 dev_err(dev, "error mapping memory\n");
 159                 ret = -EFAULT;
 160                 goto err_ioremap;
 161         }
 162
 163         /* call platform specific init function */
 164         if (pdata->init) {
 165                 ret = pdata->init(pdev);
 166                 if (ret) {
 167                         dev_err(dev, "platform init failed\n");
 168                         goto err_init;
 169                 }
 170                 /* platforms need some time to settle changed IO settings */
 171                 mdelay(10);
 172         }
 173
 174         /* enable clocks */
 175         priv->usbclk = clk_get(dev, "usb");
 176         if (IS_ERR(priv->usbclk)) {
 177                 ret = PTR_ERR(priv->usbclk);
 178                 goto err_clk;
 179         }
 180         clk_enable(priv->usbclk);
 181
 182         if (!cpu_is_mx35() && !cpu_is_mx25()) {
 183                 priv->ahbclk = clk_get(dev, "usb_ahb");
 184                 if (IS_ERR(priv->ahbclk)) {
 185                         ret = PTR_ERR(priv->ahbclk);
 186                         goto err_clk_ahb;
 187                 }
 188                 clk_enable(priv->ahbclk);
 189         }
 190
 191         /* setup specific usb hw */
 192         ret = mxc_initialize_usb_hw(pdev->id, pdata->flags);
 193         if (ret < 0)
 194                 goto err_init;
 195
 196         ehci = hcd_to_ehci(hcd);
 197
 198         /* EHCI registers start at offset 0x100 */
 199         ehci->caps = hcd->regs + 0x100;
 200         ehci->regs = hcd->regs + 0x100 +
 201             HC_LENGTH(ehci_readl(ehci, &ehci->caps->hc_capbase));
 202
 203         /* set up the PORTSCx register */
 204         ehci_writel(ehci, pdata->portsc, &ehci->regs->port_status[0]);
 205
 206         /* is this really needed? */
 207         msleep(10);
 208
 209         /* Initialize the transceiver */
 210         if (pdata->otg) {
 211                 pdata->otg->io_priv = hcd->regs + ULPI_VIEWPORT_OFFSET;
 212                 ret = otg_init(pdata->otg);
 213                 if (ret) {
 214                         dev_err(dev, "unable to init transceiver, probably missing\n");
 215                         ret = -ENODEV;
 216                         goto err_add;
 217                 }
 218                 ret = otg_set_vbus(pdata->otg, 1);
 219                 if (ret) {
 220                         dev_err(dev, "unable to enable vbus on transceiver\n");
 221                         goto err_add;
 222                 }
 223         }
 224
 225         priv->hcd = hcd;
 226         platform_set_drvdata(pdev, priv);
 227
 228         ret = usb_add_hcd(hcd, irq, IRQF_DISABLED | IRQF_SHARED);
 229         if (ret)
 230                 goto err_add;
 231
 232         return 0;
 233
 234 err_add:
 235         if (pdata && pdata->exit)
 236                 pdata->exit(pdev);
 237 err_init:
 238         if (priv->ahbclk) {
 239                 clk_disable(priv->ahbclk);
 240                 clk_put(priv->ahbclk);
 241         }
 242 err_clk_ahb:
 243         clk_disable(priv->usbclk);
 244         clk_put(priv->usbclk);
 245 err_clk:
 246         iounmap(hcd->regs);
 247 err_ioremap:
 248         release_mem_region(hcd->rsrc_start, hcd->rsrc_len);
 249 err_request_mem:
 250 err_get_resource:
 251         kfree(priv);
 252 err_alloc:
 253         usb_put_hcd(hcd);
 254         return ret;
 255 }
 256
 257 static int __exit ehci_mxc_drv_remove(struct platform_device *pdev)
 258 {
 259         struct mxc_usbh_platform_data *pdata = pdev->dev.platform_data;
 260         struct ehci_mxc_priv *priv = platform_get_drvdata(pdev);
 261         struct usb_hcd *hcd = priv->hcd;
 262
 263         if (pdata && pdata->exit)
 264                 pdata->exit(pdev);
 265
 266         if (pdata->otg)
 267                 otg_shutdown(pdata->otg);
 268
 269         usb_remove_hcd(hcd);
 270         iounmap(hcd->regs);
 271         release_mem_region(hcd->rsrc_start, hcd->rsrc_len);
 272         usb_put_hcd(hcd);
 273         platform_set_drvdata(pdev, NULL);
 274
 275         clk_disable(priv->usbclk);
 276         clk_put(priv->usbclk);
 277         if (priv->ahbclk) {
 278                 clk_disable(priv->ahbclk);
 279                 clk_put(priv->ahbclk);
 280         }
 281
 282         kfree(priv);
 283
 284         return 0;
 285 }
 286
 287 static void ehci_mxc_drv_shutdown(struct platform_device *pdev)
 288 {
 289         struct ehci_mxc_priv *priv = platform_get_drvdata(pdev);
 290         struct usb_hcd *hcd = priv->hcd;
 291
 292         if (hcd->driver->shutdown)
 293                 hcd->driver->shutdown(hcd);
 294 }
 295
 296 MODULE_ALIAS("platform:mxc-ehci");
 297
 298 static struct platform_driver ehci_mxc_driver = {
 299         .probe = ehci_mxc_drv_probe,
 300         .remove = __exit_p(ehci_mxc_drv_remove),
 301         .shutdown = ehci_mxc_drv_shutdown,
 302         .driver = {
 303                    .name = "mxc-ehci",
 304         },
 305 };