kernel/drivers/usb/host/ehci-mv.c

   1 /*
   2  * Copyright (C) 2011 Marvell International Ltd. All rights reserved.
   3  * Author: Chao Xie <chao.xie@marvell.com>
   4  *        Neil Zhang <zhangwm@marvell.com>
   5  *
   6  * This program is free software; you can redistribute  it and/or modify it
   7  * under  the terms of  the GNU General  Public License as published by the
   8  * Free Software Foundation;  either version 2 of the  License, or (at your
   9  * option) any later version.
  10  */
  11
  12 #include <linux/kernel.h>
  13 #include <linux/module.h>
  14 #include <linux/platform_device.h>
  15 #include <linux/clk.h>
  16 #include <linux/err.h>
  17 #include <linux/usb/otg.h>
  18 #include <linux/platform_data/mv_usb.h>
  19
  20 #define CAPLENGTH_MASK         (0xff)
  21
  22 struct ehci_hcd_mv {
  23         struct usb_hcd *hcd;
  24
  25         /* Which mode does this ehci running OTG/Host ? */
  26         int mode;
  27
  28         void __iomem *phy_regs;
  29         void __iomem *cap_regs;
  30         void __iomem *op_regs;
  31
  32         struct usb_phy *otg;
  33
  34         struct mv_usb_platform_data *pdata;
  35
  36         struct clk *clk;
  37 };
  38
  39 static void ehci_clock_enable(struct ehci_hcd_mv *ehci_mv)
  40 {
  41         clk_prepare_enable(ehci_mv->clk);
  42 }
  43
  44 static void ehci_clock_disable(struct ehci_hcd_mv *ehci_mv)
  45 {
  46         clk_disable_unprepare(ehci_mv->clk);
  47 }
  48
  49 static int mv_ehci_enable(struct ehci_hcd_mv *ehci_mv)
  50 {
  51         int retval;
  52
  53         ehci_clock_enable(ehci_mv);
  54         if (ehci_mv->pdata->phy_init) {
  55                 retval = ehci_mv->pdata->phy_init(ehci_mv->phy_regs);
  56                 if (retval)
  57                         return retval;
  58         }
  59
  60         return 0;
  61 }
  62
  63 static void mv_ehci_disable(struct ehci_hcd_mv *ehci_mv)
  64 {
  65         if (ehci_mv->pdata->phy_deinit)
  66                 ehci_mv->pdata->phy_deinit(ehci_mv->phy_regs);
  67         ehci_clock_disable(ehci_mv);
  68 }
  69
  70 static int mv_ehci_reset(struct usb_hcd *hcd)
  71 {
  72         struct device *dev = hcd->self.controller;
  73         struct ehci_hcd_mv *ehci_mv = dev_get_drvdata(dev);
  74         int retval;
  75
  76         if (ehci_mv == NULL) {
  77                 dev_err(dev, "Can not find private ehci data\n");
  78                 return -ENODEV;
  79         }
  80
  81         hcd->has_tt = 1;
  82
  83         retval = ehci_setup(hcd);
  84         if (retval)
  85                 dev_err(dev, "ehci_setup failed %d\n", retval);
  86
  87         return retval;
  88 }
  89
  90 static const struct hc_driver mv_ehci_hc_driver = {
  91         .description = hcd_name,
  92         .product_desc = "Marvell EHCI",
  93         .hcd_priv_size = sizeof(struct ehci_hcd),
  94
  95         /*
  96          * generic hardware linkage
  97          */
  98         .irq = ehci_irq,
  99         .flags = HCD_MEMORY | HCD_USB2 | HCD_BH,
 100
 101         /*
 102          * basic lifecycle operations
 103          */
 104         .reset = mv_ehci_reset,
 105         .start = ehci_run,
 106         .stop = ehci_stop,
 107         .shutdown = ehci_shutdown,
 108
 109         /*
 110          * managing i/o requests and associated device resources
 111          */
 112         .urb_enqueue = ehci_urb_enqueue,
 113         .urb_dequeue = ehci_urb_dequeue,
 114         .endpoint_disable = ehci_endpoint_disable,
 115         .endpoint_reset = ehci_endpoint_reset,
 116         .clear_tt_buffer_complete = ehci_clear_tt_buffer_complete,
 117
 118         /*
 119          * scheduling support
 120          */
 121         .get_frame_number = ehci_get_frame,
 122
 123         /*
 124          * root hub support
 125          */
 126         .hub_status_data = ehci_hub_status_data,
 127         .hub_control = ehci_hub_control,
 128         .bus_suspend = ehci_bus_suspend,
 129         .bus_resume = ehci_bus_resume,
 130 };
 131
 132 static int mv_ehci_probe(struct platform_device *pdev)
 133 {
 134         struct mv_usb_platform_data *pdata = dev_get_platdata(&pdev->dev);
 135         struct usb_hcd *hcd;
 136         struct ehci_hcd *ehci;
 137         struct ehci_hcd_mv *ehci_mv;
 138         struct resource *r;
 139         int retval = -ENODEV;
 140         u32 offset;
 141
 142         if (!pdata) {
 143                 dev_err(&pdev->dev, "missing platform_data\n");
 144                 return -ENODEV;
 145         }
 146
 147         if (usb_disabled())
 148                 return -ENODEV;
 149
 150         hcd = usb_create_hcd(&mv_ehci_hc_driver, &pdev->dev, "mv ehci");
 151         if (!hcd)
 152                 return -ENOMEM;
 153
 154         ehci_mv = devm_kzalloc(&pdev->dev, sizeof(*ehci_mv), GFP_KERNEL);
 155         if (ehci_mv == NULL) {
 156                 retval = -ENOMEM;
 157                 goto err_put_hcd;
 158         }
 159
 160         platform_set_drvdata(pdev, ehci_mv);
 161         ehci_mv->pdata = pdata;
 162         ehci_mv->hcd = hcd;
 163
 164         ehci_mv->clk = devm_clk_get(&pdev->dev, NULL);
 165         if (IS_ERR(ehci_mv->clk)) {
 166                 dev_err(&pdev->dev, "error getting clock\n");
 167                 retval = PTR_ERR(ehci_mv->clk);
 168                 goto err_put_hcd;
 169         }
 170
 171         r = platform_get_resource_byname(pdev, IORESOURCE_MEM, "phyregs");
 172         ehci_mv->phy_regs = devm_ioremap_resource(&pdev->dev, r);
 173         if (IS_ERR(ehci_mv->phy_regs)) {
 174                 retval = PTR_ERR(ehci_mv->phy_regs);
 175                 goto err_put_hcd;
 176         }
 177
 178         r = platform_get_resource_byname(pdev, IORESOURCE_MEM, "capregs");
 179         ehci_mv->cap_regs = devm_ioremap_resource(&pdev->dev, r);
 180         if (IS_ERR(ehci_mv->cap_regs)) {
 181                 retval = PTR_ERR(ehci_mv->cap_regs);
 182                 goto err_put_hcd;
 183         }
 184
 185         retval = mv_ehci_enable(ehci_mv);
 186         if (retval) {
 187                 dev_err(&pdev->dev, "init phy error %d\n", retval);
 188                 goto err_put_hcd;
 189         }
 190
 191         offset = readl(ehci_mv->cap_regs) & CAPLENGTH_MASK;
 192         ehci_mv->op_regs =
 193                 (void __iomem *) ((unsigned long) ehci_mv->cap_regs + offset);
 194
 195         hcd->rsrc_start = r->start;
 196         hcd->rsrc_len = resource_size(r);
 197         hcd->regs = ehci_mv->op_regs;
 198
 199         hcd->irq = platform_get_irq(pdev, 0);
 200         if (!hcd->irq) {
 201                 dev_err(&pdev->dev, "Cannot get irq.");
 202                 retval = -ENODEV;
 203                 goto err_disable_clk;
 204         }
 205
 206         ehci = hcd_to_ehci(hcd);
 207         ehci->caps = (struct ehci_caps *) ehci_mv->cap_regs;
 208
 209         ehci_mv->mode = pdata->mode;
 210         if (ehci_mv->mode == MV_USB_MODE_OTG) {
 211                 ehci_mv->otg = devm_usb_get_phy(&pdev->dev, USB_PHY_TYPE_USB2);
 212                 if (IS_ERR(ehci_mv->otg)) {
 213                         retval = PTR_ERR(ehci_mv->otg);
 214
 215                         if (retval == -ENXIO)
 216                                 dev_info(&pdev->dev, "MV_USB_MODE_OTG "
 217                                                 "must have CONFIG_USB_PHY enabled\n");
 218                         else
 219                                 dev_err(&pdev->dev,
 220                                                 "unable to find transceiver\n");
 221                         goto err_disable_clk;
 222                 }
 223
 224                 retval = otg_set_host(ehci_mv->otg->otg, &hcd->self);
 225                 if (retval < 0) {
 226                         dev_err(&pdev->dev,
 227                                 "unable to register with transceiver\n");
 228                         retval = -ENODEV;
 229                         goto err_disable_clk;
 230                 }
 231                 /* otg will enable clock before use as host */
 232                 mv_ehci_disable(ehci_mv);
 233         } else {
 234                 if (pdata->set_vbus)
 235                         pdata->set_vbus(1);
 236
 237                 retval = usb_add_hcd(hcd, hcd->irq, IRQF_SHARED);
 238                 if (retval) {
 239                         dev_err(&pdev->dev,
 240                                 "failed to add hcd with err %d\n", retval);
 241                         goto err_set_vbus;
 242                 }
 243                 device_wakeup_enable(hcd->self.controller);
 244         }
 245
 246         if (pdata->private_init)
 247                 pdata->private_init(ehci_mv->op_regs, ehci_mv->phy_regs);
 248
 249         dev_info(&pdev->dev,
 250                  "successful find EHCI device with regs 0x%p irq %d"
 251                  " working in %s mode\n", hcd->regs, hcd->irq,
 252                  ehci_mv->mode == MV_USB_MODE_OTG ? "OTG" : "Host");
 253
 254         return 0;
 255
 256 err_set_vbus:
 257         if (pdata->set_vbus)
 258                 pdata->set_vbus(0);
 259 err_disable_clk:
 260         mv_ehci_disable(ehci_mv);
 261 err_put_hcd:
 262         usb_put_hcd(hcd);
 263
 264         return retval;
 265 }
 266
 267 static int mv_ehci_remove(struct platform_device *pdev)
 268 {
 269         struct ehci_hcd_mv *ehci_mv = platform_get_drvdata(pdev);
 270         struct usb_hcd *hcd = ehci_mv->hcd;
 271
 272         if (hcd->rh_registered)
 273                 usb_remove_hcd(hcd);
 274
 275         if (!IS_ERR_OR_NULL(ehci_mv->otg))
 276                 otg_set_host(ehci_mv->otg->otg, NULL);
 277
 278         if (ehci_mv->mode == MV_USB_MODE_HOST) {
 279                 if (ehci_mv->pdata->set_vbus)
 280                         ehci_mv->pdata->set_vbus(0);
 281
 282                 mv_ehci_disable(ehci_mv);
 283         }
 284
 285         usb_put_hcd(hcd);
 286
 287         return 0;
 288 }
 289
 290 MODULE_ALIAS("mv-ehci");
 291
 292 static const struct platform_device_id ehci_id_table[] = {
 293         {"pxa-u2oehci", PXA_U2OEHCI},
 294         {"pxa-sph", PXA_SPH},
 295         {"mmp3-hsic", MMP3_HSIC},
 296         {"mmp3-fsic", MMP3_FSIC},
 297         {},
 298 };
 299
 300 static void mv_ehci_shutdown(struct platform_device *pdev)
 301 {
 302         struct ehci_hcd_mv *ehci_mv = platform_get_drvdata(pdev);
 303         struct usb_hcd *hcd = ehci_mv->hcd;
 304
 305         if (!hcd->rh_registered)
 306                 return;
 307
 308         if (hcd->driver->shutdown)
 309                 hcd->driver->shutdown(hcd);
 310 }
 311
 312 static struct platform_driver ehci_mv_driver = {
 313         .probe = mv_ehci_probe,
 314         .remove = mv_ehci_remove,
 315         .shutdown = mv_ehci_shutdown,
 316         .driver = {
 317                    .name = "mv-ehci",
 318                    .bus = &platform_bus_type,
 319                    },
 320         .id_table = ehci_id_table,
 321 };