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/of.h>
  17 #include <linux/platform_device.h>
  18 #include <plat/ehci.h>
  19 #include <plat/usb-phy.h>
  20
  21 #define EHCI_INSNREG00(base)                    (base + 0x90)
  22 #define EHCI_INSNREG00_ENA_INCR16               (0x1 << 25)
  23 #define EHCI_INSNREG00_ENA_INCR8                (0x1 << 24)
  24 #define EHCI_INSNREG00_ENA_INCR4                (0x1 << 23)
  25 #define EHCI_INSNREG00_ENA_INCRX_ALIGN          (0x1 << 22)
  26 #define EHCI_INSNREG00_ENABLE_DMA_BURST \
  27         (EHCI_INSNREG00_ENA_INCR16 | EHCI_INSNREG00_ENA_INCR8 | \
  28          EHCI_INSNREG00_ENA_INCR4 | EHCI_INSNREG00_ENA_INCRX_ALIGN)
  29
  30 struct s5p_ehci_hcd {
  31         struct device *dev;
  32         struct usb_hcd *hcd;
  33         struct clk *clk;
  34 };
  35
  36 static const struct hc_driver s5p_ehci_hc_driver = {
  37         .description            = hcd_name,
  38         .product_desc           = "S5P EHCI Host Controller",
  39         .hcd_priv_size          = sizeof(struct ehci_hcd),
  40
  41         .irq                    = ehci_irq,
  42         .flags                  = HCD_MEMORY | HCD_USB2,
  43
  44         .reset                  = ehci_setup,
  45         .start                  = ehci_run,
  46         .stop                   = ehci_stop,
  47         .shutdown               = ehci_shutdown,
  48
  49         .get_frame_number       = ehci_get_frame,
  50
  51         .urb_enqueue            = ehci_urb_enqueue,
  52         .urb_dequeue            = ehci_urb_dequeue,
  53         .endpoint_disable       = ehci_endpoint_disable,
  54         .endpoint_reset         = ehci_endpoint_reset,
  55
  56         .hub_status_data        = ehci_hub_status_data,
  57         .hub_control            = ehci_hub_control,
  58         .bus_suspend            = ehci_bus_suspend,
  59         .bus_resume             = ehci_bus_resume,
  60
  61         .relinquish_port        = ehci_relinquish_port,
  62         .port_handed_over       = ehci_port_handed_over,
  63
  64         .clear_tt_buffer_complete       = ehci_clear_tt_buffer_complete,
  65 };
  66
  67 static u64 ehci_s5p_dma_mask = DMA_BIT_MASK(32);
  68
  69 static int __devinit s5p_ehci_probe(struct platform_device *pdev)
  70 {
  71         struct s5p_ehci_platdata *pdata;
  72         struct s5p_ehci_hcd *s5p_ehci;
  73         struct usb_hcd *hcd;
  74         struct ehci_hcd *ehci;
  75         struct resource *res;
  76         int irq;
  77         int err;
  78
  79         pdata = pdev->dev.platform_data;
  80         if (!pdata) {
  81                 dev_err(&pdev->dev, "No platform data defined\n");
  82                 return -EINVAL;
  83         }
  84
  85         /*
  86          * Right now device-tree probed devices don't get dma_mask set.
  87          * Since shared usb code relies on it, set it here for now.
  88          * Once we move to full device tree support this will vanish off.
  89          */
  90         if (!pdev->dev.dma_mask)
  91                 pdev->dev.dma_mask = &ehci_s5p_dma_mask;
  92         if (!pdev->dev.coherent_dma_mask)
  93                 pdev->dev.coherent_dma_mask = DMA_BIT_MASK(32);
  94
  95         s5p_ehci = devm_kzalloc(&pdev->dev, sizeof(struct s5p_ehci_hcd),
  96                                 GFP_KERNEL);
  97         if (!s5p_ehci)
  98                 return -ENOMEM;
  99
 100         s5p_ehci->dev = &pdev->dev;
 101
 102         hcd = usb_create_hcd(&s5p_ehci_hc_driver, &pdev->dev,
 103                                         dev_name(&pdev->dev));
 104         if (!hcd) {
 105                 dev_err(&pdev->dev, "Unable to create HCD\n");
 106                 return -ENOMEM;
 107         }
 108
 109         s5p_ehci->hcd = hcd;
 110         s5p_ehci->clk = clk_get(&pdev->dev, "usbhost");
 111
 112         if (IS_ERR(s5p_ehci->clk)) {
 113                 dev_err(&pdev->dev, "Failed to get usbhost clock\n");
 114                 err = PTR_ERR(s5p_ehci->clk);
 115                 goto fail_clk;
 116         }
 117
 118         err = clk_enable(s5p_ehci->clk);
 119         if (err)
 120                 goto fail_clken;
 121
 122         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 123         if (!res) {
 124                 dev_err(&pdev->dev, "Failed to get I/O memory\n");
 125                 err = -ENXIO;
 126                 goto fail_io;
 127         }
 128
 129         hcd->rsrc_start = res->start;
 130         hcd->rsrc_len = resource_size(res);
 131         hcd->regs = devm_ioremap(&pdev->dev, res->start, hcd->rsrc_len);
 132         if (!hcd->regs) {
 133                 dev_err(&pdev->dev, "Failed to remap I/O memory\n");
 134                 err = -ENOMEM;
 135                 goto fail_io;
 136         }
 137
 138         irq = platform_get_irq(pdev, 0);
 139         if (!irq) {
 140                 dev_err(&pdev->dev, "Failed to get IRQ\n");
 141                 err = -ENODEV;
 142                 goto fail_io;
 143         }
 144
 145         if (pdata->phy_init)
 146                 pdata->phy_init(pdev, S5P_USB_PHY_HOST);
 147
 148         ehci = hcd_to_ehci(hcd);
 149         ehci->caps = hcd->regs;
 150
 151         /* DMA burst Enable */
 152         writel(EHCI_INSNREG00_ENABLE_DMA_BURST, EHCI_INSNREG00(hcd->regs));
 153
 154         err = usb_add_hcd(hcd, irq, IRQF_SHARED);
 155         if (err) {
 156                 dev_err(&pdev->dev, "Failed to add USB HCD\n");
 157                 goto fail_io;
 158         }
 159
 160         platform_set_drvdata(pdev, s5p_ehci);
 161
 162         return 0;
 163
 164 fail_io:
 165         clk_disable(s5p_ehci->clk);
 166 fail_clken:
 167         clk_put(s5p_ehci->clk);
 168 fail_clk:
 169         usb_put_hcd(hcd);
 170         return err;
 171 }
 172
 173 static int __devexit s5p_ehci_remove(struct platform_device *pdev)
 174 {
 175         struct s5p_ehci_platdata *pdata = pdev->dev.platform_data;
 176         struct s5p_ehci_hcd *s5p_ehci = platform_get_drvdata(pdev);
 177         struct usb_hcd *hcd = s5p_ehci->hcd;
 178
 179         usb_remove_hcd(hcd);
 180
 181         if (pdata && pdata->phy_exit)
 182                 pdata->phy_exit(pdev, S5P_USB_PHY_HOST);
 183
 184         clk_disable(s5p_ehci->clk);
 185         clk_put(s5p_ehci->clk);
 186
 187         usb_put_hcd(hcd);
 188
 189         return 0;
 190 }
 191
 192 static void s5p_ehci_shutdown(struct platform_device *pdev)
 193 {
 194         struct s5p_ehci_hcd *s5p_ehci = platform_get_drvdata(pdev);
 195         struct usb_hcd *hcd = s5p_ehci->hcd;
 196
 197         if (hcd->driver->shutdown)
 198                 hcd->driver->shutdown(hcd);
 199 }
 200
 201 #ifdef CONFIG_PM
 202 static int s5p_ehci_suspend(struct device *dev)
 203 {
 204         struct s5p_ehci_hcd *s5p_ehci = dev_get_drvdata(dev);
 205         struct usb_hcd *hcd = s5p_ehci->hcd;
 206         bool do_wakeup = device_may_wakeup(dev);
 207         struct platform_device *pdev = to_platform_device(dev);
 208         struct s5p_ehci_platdata *pdata = pdev->dev.platform_data;
 209         int rc;
 210
 211         rc = ehci_suspend(hcd, do_wakeup);
 212
 213         if (pdata && pdata->phy_exit)
 214                 pdata->phy_exit(pdev, S5P_USB_PHY_HOST);
 215
 216         clk_disable(s5p_ehci->clk);
 217
 218         return rc;
 219 }
 220
 221 static int s5p_ehci_resume(struct device *dev)
 222 {
 223         struct s5p_ehci_hcd *s5p_ehci = dev_get_drvdata(dev);
 224         struct usb_hcd *hcd = s5p_ehci->hcd;
 225         struct platform_device *pdev = to_platform_device(dev);
 226         struct s5p_ehci_platdata *pdata = pdev->dev.platform_data;
 227
 228         clk_enable(s5p_ehci->clk);
 229
 230         if (pdata && pdata->phy_init)
 231                 pdata->phy_init(pdev, S5P_USB_PHY_HOST);
 232
 233         /* DMA burst Enable */
 234         writel(EHCI_INSNREG00_ENABLE_DMA_BURST, EHCI_INSNREG00(hcd->regs));
 235
 236         ehci_resume(hcd, false);
 237         return 0;
 238 }
 239 #else
 240 #define s5p_ehci_suspend        NULL
 241 #define s5p_ehci_resume         NULL
 242 #endif
 243
 244 static const struct dev_pm_ops s5p_ehci_pm_ops = {
 245         .suspend        = s5p_ehci_suspend,
 246         .resume         = s5p_ehci_resume,
 247 };
 248
 249 #ifdef CONFIG_OF
 250 static const struct of_device_id exynos_ehci_match[] = {
 251         { .compatible = "samsung,exynos-ehci" },
 252         {},
 253 };
 254 MODULE_DEVICE_TABLE(of, exynos_ehci_match);
 255 #endif
 256
 257 static struct platform_driver s5p_ehci_driver = {
 258         .probe          = s5p_ehci_probe,
 259         .remove         = __devexit_p(s5p_ehci_remove),
 260         .shutdown       = s5p_ehci_shutdown,
 261         .driver = {
 262                 .name   = "s5p-ehci",
 263                 .owner  = THIS_MODULE,
 264                 .pm     = &s5p_ehci_pm_ops,
 265                 .of_match_table = of_match_ptr(exynos_ehci_match),
 266         }
 267 };
 268
 269 MODULE_ALIAS("platform:s5p-ehci");