drivers/usb/host/ohci-rockchip.c

   1 /*
   2  * ROCKCHIP USB HOST OHCI Controller
   3  *
   4  * This program is free software; you can redistribute  it and/or modify it
   5  * under  the terms of  the GNU General  Public License as published by the
   6  * Free Software Foundation;  either version 2 of the  License, or (at your
   7  * option) any later version.
   8  *
   9  */
  10
  11 #include <linux/platform_device.h>
  12 #include <linux/pm_runtime.h>
  13 #include <linux/of.h>
  14 #include <linux/clk.h>
  15 #include <linux/dma-mapping.h>
  16 #include <linux/of_platform.h>
  17 #include "../dwc_otg_310/usbdev_rk.h"
  18
  19 static int ohci_rk_init(struct usb_hcd *hcd)
  20 {
  21         dev_dbg(hcd->self.controller, "starting OHCI controller\n");
  22
  23         return ohci_init(hcd_to_ohci(hcd));
  24 }
  25
  26 static int ohci_rk_start(struct usb_hcd *hcd)
  27 {
  28         struct ohci_hcd *ohci = hcd_to_ohci(hcd);
  29         int ret;
  30
  31         /*
  32          * RemoteWakeupConnected has to be set explicitly before
  33          * calling ohci_run. The reset value of RWC is 0.
  34          */
  35         ohci->hc_control = OHCI_CTRL_RWC;
  36         writel(OHCI_CTRL_RWC, &ohci->regs->control);
  37
  38         ret = ohci_run(ohci);
  39
  40         if (ret < 0) {
  41                 dev_err(hcd->self.controller, "can't start\n");
  42                 ohci_stop(hcd);
  43         }
  44
  45         return ret;
  46 }
  47
  48 static const struct hc_driver ohci_rk_hc_driver = {
  49         .description = hcd_name,
  50         .product_desc = "RK OHCI Host Controller",
  51         .hcd_priv_size = sizeof(struct ohci_hcd),
  52
  53         /*
  54          * generic hardware linkage
  55          */
  56         .irq = ohci_irq,
  57         .flags = HCD_USB11 | HCD_MEMORY,
  58
  59         /*
  60          * basic lifecycle operations
  61          */
  62         .reset = ohci_rk_init,
  63         .start = ohci_rk_start,
  64         .stop = ohci_stop,
  65         .shutdown = ohci_shutdown,
  66
  67         /*
  68          * managing i/o requests and associated device resources
  69          */
  70         .urb_enqueue = ohci_urb_enqueue,
  71         .urb_dequeue = ohci_urb_dequeue,
  72         .endpoint_disable = ohci_endpoint_disable,
  73
  74         /*
  75          * scheduling support
  76          */
  77         .get_frame_number = ohci_get_frame,
  78
  79         /*
  80          * root hub support
  81          */
  82         .hub_status_data = ohci_hub_status_data,
  83         .hub_control = ohci_hub_control,
  84 #ifdef  CONFIG_PM
  85         .bus_suspend = ohci_bus_suspend,
  86         .bus_resume = ohci_bus_resume,
  87 #endif
  88         .start_port_reset = ohci_start_port_reset,
  89 };
  90
  91 static struct of_device_id rk_ohci_of_match[] = {
  92         {
  93          .compatible = "rockchip,rk3126_ohci",
  94          .data = &usb20ohci_pdata_rk3126,
  95          },
  96         {},
  97 };
  98
  99 MODULE_DEVICE_TABLE(of, rk_ohci_of_match);
 100
 101 /* ohci_hcd_rk_probe - initialize RK-based HCDs
 102  * Allocates basic resources for this USB host controller, and
 103  * then invokes the start() method for the HCD associated with it
 104  * through the hotplug entry's driver_data.
 105  */
 106 static int ohci_hcd_rk_probe(struct platform_device *pdev)
 107 {
 108         struct device *dev = &pdev->dev;
 109         struct usb_hcd *hcd = NULL;
 110         void __iomem *regs = NULL;
 111         struct resource *res;
 112         int ret = -ENODEV;
 113         int irq;
 114         struct dwc_otg_platform_data *pldata;
 115         const struct of_device_id *match;
 116
 117         dev_dbg(&pdev->dev, "ohci_hcd_rk_probe\n");
 118
 119         if (usb_disabled())
 120                 return -ENODEV;
 121
 122         match = of_match_device(of_match_ptr(rk_ohci_of_match), &pdev->dev);
 123         if (match) {
 124                 pldata = (struct dwc_otg_platform_data *)match->data;
 125         } else {
 126                 dev_err(dev, "ohci_rk match failed\n");
 127                 return -EINVAL;
 128         }
 129
 130         pldata->dev = dev;
 131         dev->platform_data = pldata;
 132
 133         if (pldata->hw_init)
 134                 pldata->hw_init();
 135
 136         if (pldata->clock_init) {
 137                 pldata->clock_init(pldata);
 138                 pldata->clock_enable(pldata, 1);
 139         }
 140
 141         irq = platform_get_irq(pdev, 0);
 142         if (irq < 0) {
 143                 dev_err(dev, "OHCI irq failed\n");
 144                 ret = irq;
 145                 goto clk_disable;
 146         }
 147
 148         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 149         if (!res) {
 150                 dev_err(dev, "UHH OHCI get resource failed\n");
 151                 ret = -ENOMEM;
 152                 goto clk_disable;
 153         }
 154
 155         regs = devm_ioremap_resource(dev, res);
 156         if (!regs) {
 157                 dev_err(dev, "UHH OHCI ioremap failed\n");
 158                 ret = -ENOMEM;
 159                 goto clk_disable;
 160         }
 161
 162         /*
 163          * Right now device-tree probed devices don't get dma_mask set.
 164          * Since shared usb code relies on it, set it here for now.
 165          * Once we have dma capability bindings this can go away.
 166          */
 167         if (!dev->dma_mask)
 168                 dev->dma_mask = &dev->coherent_dma_mask;
 169         if (!dev->coherent_dma_mask)
 170                 dev->coherent_dma_mask = DMA_BIT_MASK(32);
 171
 172         hcd = usb_create_hcd(&ohci_rk_hc_driver, dev, dev_name(dev));
 173         if (!hcd) {
 174                 dev_err(dev, "usb_create_hcd failed\n");
 175                 ret = -ENOMEM;
 176                 goto clk_disable;
 177         }
 178
 179         hcd->rsrc_start = res->start;
 180         hcd->rsrc_len = resource_size(res);
 181         hcd->regs = regs;
 182
 183         ohci_hcd_init(hcd_to_ohci(hcd));
 184
 185         ret = usb_add_hcd(hcd, irq, 0);
 186         if (ret) {
 187                 dev_dbg(dev, "failed to add hcd with err %d\n", ret);
 188                 goto err_add_hcd;
 189         }
 190
 191         return 0;
 192
 193 err_add_hcd:
 194         usb_put_hcd(hcd);
 195
 196 clk_disable:
 197         if (pldata->clock_enable)
 198                 pldata->clock_enable(pldata, 0);
 199
 200         return ret;
 201 }
 202
 203 static int ohci_hcd_rk_remove(struct platform_device *pdev)
 204 {
 205         struct device *dev = &pdev->dev;
 206         struct usb_hcd *hcd = dev_get_drvdata(dev);
 207
 208         usb_remove_hcd(hcd);
 209         usb_put_hcd(hcd);
 210         return 0;
 211 }
 212
 213 static void ohci_hcd_rk_shutdown(struct platform_device *pdev)
 214 {
 215         struct usb_hcd *hcd = dev_get_drvdata(&pdev->dev);
 216
 217         if (hcd->driver->shutdown)
 218                 hcd->driver->shutdown(hcd);
 219 }
 220
 221 static struct platform_driver ohci_hcd_rk_driver = {
 222         .probe = ohci_hcd_rk_probe,
 223         .remove = ohci_hcd_rk_remove,
 224         .shutdown = ohci_hcd_rk_shutdown,
 225         .driver = {
 226                    .name = "ohci-rockchip",
 227                    .of_match_table = of_match_ptr(rk_ohci_of_match),
 228                    },
 229 };
 230
 231 MODULE_ALIAS("platform:rockchip-ohci");