drivers/usb/host/ehci-s5p.c

   1 /*
   2  * SAMSUNG S5P USB HOST EHCI Controller
   3  *
   4  * Copyright (C) 2011 Samsung Electronics Co.Ltd
   5  * Author: Jingoo Han <jg1.han@samsung.com>
   6  * Author: Joonyoung Shim <jy0922.shim@samsung.com>
   7  *
   8  * This program is free software; you can redistribute  it and/or modify it
   9  * under  the terms of  the GNU General  Public License as published by the
  10  * Free Software Foundation;  either version 2 of the  License, or (at your
  11  * option) any later version.
  12  *
  13  */
  14
  15 #include <linux/clk.h>
  16 #include <linux/platform_device.h>
  17 #include <mach/regs-pmu.h>
  18 #include <plat/cpu.h>
  19 #include <plat/ehci.h>
  20 #include <plat/usb-phy.h>
  21
  22 struct s5p_ehci_hcd {
  23         struct device *dev;
  24         struct usb_hcd *hcd;
  25         struct clk *clk;
  26 };
  27
  28 static const struct hc_driver s5p_ehci_hc_driver = {
  29         .description            = hcd_name,
  30         .product_desc           = "S5P EHCI Host Controller",
  31         .hcd_priv_size          = sizeof(struct ehci_hcd),
  32
  33         .irq                    = ehci_irq,
  34         .flags                  = HCD_MEMORY | HCD_USB2,
  35
  36         .reset                  = ehci_init,
  37         .start                  = ehci_run,
  38         .stop                   = ehci_stop,
  39         .shutdown               = ehci_shutdown,
  40
  41         .get_frame_number       = ehci_get_frame,
  42
  43         .urb_enqueue            = ehci_urb_enqueue,
  44         .urb_dequeue            = ehci_urb_dequeue,
  45         .endpoint_disable       = ehci_endpoint_disable,
  46         .endpoint_reset         = ehci_endpoint_reset,
  47
  48         .hub_status_data        = ehci_hub_status_data,
  49         .hub_control            = ehci_hub_control,
  50         .bus_suspend            = ehci_bus_suspend,
  51         .bus_resume             = ehci_bus_resume,
  52
  53         .relinquish_port        = ehci_relinquish_port,
  54         .port_handed_over       = ehci_port_handed_over,
  55
  56         .clear_tt_buffer_complete       = ehci_clear_tt_buffer_complete,
  57 };
  58
  59 static int __devinit s5p_ehci_probe(struct platform_device *pdev)
  60 {
  61         struct s5p_ehci_platdata *pdata;
  62         struct s5p_ehci_hcd *s5p_ehci;
  63         struct usb_hcd *hcd;
  64         struct ehci_hcd *ehci;
  65         struct resource *res;
  66         int irq;
  67         int err;
  68
  69         pdata = pdev->dev.platform_data;
  70         if (!pdata) {
  71                 dev_err(&pdev->dev, "No platform data defined\n");
  72                 return -EINVAL;
  73         }
  74
  75         s5p_ehci = kzalloc(sizeof(struct s5p_ehci_hcd), GFP_KERNEL);
  76         if (!s5p_ehci)
  77                 return -ENOMEM;
  78
  79         s5p_ehci->dev = &pdev->dev;
  80
  81         hcd = usb_create_hcd(&s5p_ehci_hc_driver, &pdev->dev,
  82                                         dev_name(&pdev->dev));
  83         if (!hcd) {
  84                 dev_err(&pdev->dev, "Unable to create HCD\n");
  85                 err = -ENOMEM;
  86                 goto fail_hcd;
  87         }
  88
  89         s5p_ehci->clk = clk_get(&pdev->dev, "usbhost");
  90
  91         if (IS_ERR(s5p_ehci->clk)) {
  92                 dev_err(&pdev->dev, "Failed to get usbhost clock\n");
  93                 err = PTR_ERR(s5p_ehci->clk);
  94                 goto fail_clk;
  95         }
  96
  97         err = clk_enable(s5p_ehci->clk);
  98         if (err)
  99                 goto fail_clken;
 100
 101         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 102         if (!res) {
 103                 dev_err(&pdev->dev, "Failed to get I/O memory\n");
 104                 err = -ENXIO;
 105                 goto fail_io;
 106         }
 107
 108         hcd->rsrc_start = res->start;
 109         hcd->rsrc_len = resource_size(res);
 110         hcd->regs = ioremap(res->start, resource_size(res));
 111         if (!hcd->regs) {
 112                 dev_err(&pdev->dev, "Failed to remap I/O memory\n");
 113                 err = -ENOMEM;
 114                 goto fail_io;
 115         }
 116
 117         irq = platform_get_irq(pdev, 0);
 118         if (!irq) {
 119                 dev_err(&pdev->dev, "Failed to get IRQ\n");
 120                 err = -ENODEV;
 121                 goto fail;
 122         }
 123
 124         if (pdata->phy_init)
 125                 pdata->phy_init(pdev, S5P_USB_PHY_HOST);
 126
 127         ehci = hcd_to_ehci(hcd);
 128         ehci->caps = hcd->regs;
 129         ehci->regs = hcd->regs +
 130                 HC_LENGTH(ehci, readl(&ehci->caps->hc_capbase));
 131
 132         dbg_hcs_params(ehci, "reset");
 133         dbg_hcc_params(ehci, "reset");
 134
 135         /* cache this readonly data; minimize chip reads */
 136         ehci->hcs_params = readl(&ehci->caps->hcs_params);
 137
 138         err = usb_add_hcd(hcd, irq, IRQF_DISABLED | IRQF_SHARED);
 139         if (err) {
 140                 dev_err(&pdev->dev, "Failed to add USB HCD\n");
 141                 goto fail;
 142         }
 143
 144         platform_set_drvdata(pdev, s5p_ehci);
 145
 146         return 0;
 147
 148 fail:
 149         iounmap(hcd->regs);
 150 fail_io:
 151         clk_disable(s5p_ehci->clk);
 152 fail_clken:
 153         clk_put(s5p_ehci->clk);
 154 fail_clk:
 155         usb_put_hcd(hcd);
 156 fail_hcd:
 157         kfree(s5p_ehci);
 158         return err;
 159 }
 160
 161 static int __devexit s5p_ehci_remove(struct platform_device *pdev)
 162 {
 163         struct s5p_ehci_platdata *pdata = pdev->dev.platform_data;
 164         struct s5p_ehci_hcd *s5p_ehci = platform_get_drvdata(pdev);
 165         struct usb_hcd *hcd = s5p_ehci->hcd;
 166
 167         usb_remove_hcd(hcd);
 168
 169         if (pdata && pdata->phy_exit)
 170                 pdata->phy_exit(pdev, S5P_USB_PHY_HOST);
 171
 172         iounmap(hcd->regs);
 173
 174         clk_disable(s5p_ehci->clk);
 175         clk_put(s5p_ehci->clk);
 176
 177         usb_put_hcd(hcd);
 178         kfree(s5p_ehci);
 179
 180         return 0;
 181 }
 182
 183 static void s5p_ehci_shutdown(struct platform_device *pdev)
 184 {
 185         struct s5p_ehci_hcd *s5p_ehci = platform_get_drvdata(pdev);
 186         struct usb_hcd *hcd = s5p_ehci->hcd;
 187
 188         if (hcd->driver->shutdown)
 189                 hcd->driver->shutdown(hcd);
 190 }
 191
 192 #ifdef CONFIG_PM
 193 static int s5p_ehci_suspend(struct device *dev)
 194 {
 195         struct s5p_ehci_hcd *s5p_ehci = dev_get_drvdata(dev);
 196         struct usb_hcd *hcd = s5p_ehci->hcd;
 197         struct ehci_hcd *ehci = hcd_to_ehci(hcd);
 198         struct platform_device *pdev = to_platform_device(dev);
 199         struct s5p_ehci_platdata *pdata = pdev->dev.platform_data;
 200         unsigned long flags;
 201         int rc = 0;
 202
 203         if (time_before(jiffies, ehci->next_statechange))
 204                 msleep(20);
 205
 206         /*
 207          * Root hub was already suspended. Disable irq emission and
 208          * mark HW unaccessible.  The PM and USB cores make sure that
 209          * the root hub is either suspended or stopped.
 210          */
 211         ehci_prepare_ports_for_controller_suspend(ehci, device_may_wakeup(dev));
 212         spin_lock_irqsave(&ehci->lock, flags);
 213         ehci_writel(ehci, 0, &ehci->regs->intr_enable);
 214         (void)ehci_readl(ehci, &ehci->regs->intr_enable);
 215
 216         clear_bit(HCD_FLAG_HW_ACCESSIBLE, &hcd->flags);
 217         spin_unlock_irqrestore(&ehci->lock, flags);
 218
 219         if (pdata && pdata->phy_exit)
 220                 pdata->phy_exit(pdev, S5P_USB_PHY_HOST);
 221
 222         return rc;
 223 }
 224
 225 static int s5p_ehci_resume(struct device *dev)
 226 {
 227         struct s5p_ehci_hcd *s5p_ehci = dev_get_drvdata(dev);
 228         struct usb_hcd *hcd = s5p_ehci->hcd;
 229         struct ehci_hcd *ehci = hcd_to_ehci(hcd);
 230         struct platform_device *pdev = to_platform_device(dev);
 231         struct s5p_ehci_platdata *pdata = pdev->dev.platform_data;
 232
 233         if (pdata && pdata->phy_init)
 234                 pdata->phy_init(pdev, S5P_USB_PHY_HOST);
 235
 236         if (time_before(jiffies, ehci->next_statechange))
 237                 msleep(100);
 238
 239         /* Mark hardware accessible again as we are out of D3 state by now */
 240         set_bit(HCD_FLAG_HW_ACCESSIBLE, &hcd->flags);
 241
 242         if (ehci_readl(ehci, &ehci->regs->configured_flag) == FLAG_CF) {
 243                 int     mask = INTR_MASK;
 244
 245                 ehci_prepare_ports_for_controller_resume(ehci);
 246                 if (!hcd->self.root_hub->do_remote_wakeup)
 247                         mask &= ~STS_PCD;
 248                 ehci_writel(ehci, mask, &ehci->regs->intr_enable);
 249                 ehci_readl(ehci, &ehci->regs->intr_enable);
 250                 return 0;
 251         }
 252
 253         usb_root_hub_lost_power(hcd->self.root_hub);
 254
 255         (void) ehci_halt(ehci);
 256         (void) ehci_reset(ehci);
 257
 258         /* emptying the schedule aborts any urbs */
 259         spin_lock_irq(&ehci->lock);
 260         if (ehci->reclaim)
 261                 end_unlink_async(ehci);
 262         ehci_work(ehci);
 263         spin_unlock_irq(&ehci->lock);
 264
 265         ehci_writel(ehci, ehci->command, &ehci->regs->command);
 266         ehci_writel(ehci, FLAG_CF, &ehci->regs->configured_flag);
 267         ehci_readl(ehci, &ehci->regs->command); /* unblock posted writes */
 268
 269         /* here we "know" root ports should always stay powered */
 270         ehci_port_power(ehci, 1);
 271
 272         hcd->state = HC_STATE_SUSPENDED;
 273
 274         return 0;
 275 }
 276 #else
 277 #define s5p_ehci_suspend        NULL
 278 #define s5p_ehci_resume         NULL
 279 #endif
 280
 281 static const struct dev_pm_ops s5p_ehci_pm_ops = {
 282         .suspend        = s5p_ehci_suspend,
 283         .resume         = s5p_ehci_resume,
 284 };
 285
 286 static struct platform_driver s5p_ehci_driver = {
 287         .probe          = s5p_ehci_probe,
 288         .remove         = __devexit_p(s5p_ehci_remove),
 289         .shutdown       = s5p_ehci_shutdown,
 290         .driver = {
 291                 .name   = "s5p-ehci",
 292                 .owner  = THIS_MODULE,
 293                 .pm     = &s5p_ehci_pm_ops,
 294         }
 295 };
 296
 297 MODULE_ALIAS("platform:s5p-ehci");