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         /* EHCI registers start at offset 0x100 */
  42         ehci->caps = hcd->regs + 0x100;
  43         ehci->regs = hcd->regs + 0x100 +
  44             HC_LENGTH(ehci_readl(ehci, &ehci->caps->hc_capbase));
  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
  96         /*
  97          * scheduling support
  98          */
  99         .get_frame_number = ehci_get_frame,
 100
 101         /*
 102          * root hub support
 103          */
 104         .hub_status_data = ehci_hub_status_data,
 105         .hub_control = ehci_hub_control,
 106         .bus_suspend = ehci_bus_suspend,
 107         .bus_resume = ehci_bus_resume,
 108         .relinquish_port = ehci_relinquish_port,
 109         .port_handed_over = ehci_port_handed_over,
 110 };
 111
 112 static int ehci_mxc_drv_probe(struct platform_device *pdev)
 113 {
 114         struct mxc_usbh_platform_data *pdata = pdev->dev.platform_data;
 115         struct usb_hcd *hcd;
 116         struct resource *res;
 117         int irq, ret, temp;
 118         struct ehci_mxc_priv *priv;
 119         struct device *dev = &pdev->dev;
 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         /* set up the PORTSCx register */
 192         ehci_writel(ehci, pdata->portsc, &ehci->regs->port_status[0]);
 193         mdelay(10);
 194
 195         /* setup specific usb hw */
 196         ret = mxc_initialize_usb_hw(pdev->id, pdata->flags);
 197         if (ret < 0)
 198                 goto err_init;
 199
 200         /* Initialize the transceiver */
 201         if (pdata->otg) {
 202                 pdata->otg->io_priv = hcd->regs + ULPI_VIEWPORT_OFFSET;
 203                 ret = otg_init(pdata->otg);
 204                 if (ret) {
 205                         dev_err(dev, "unable to init transceiver, probably missing\n");
 206                         ret = -ENODEV;
 207                         goto err_add;
 208                 }
 209                 ret = otg_set_vbus(pdata->otg, 1);
 210                 if (ret) {
 211                         dev_err(dev, "unable to enable vbus on transceiver\n");
 212                         goto err_add;
 213                 }
 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 };