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          .compatible = "rockchip,rk3368_ohci",
  98          .data = &usb20ohci_pdata_rk3368,
  99          },
 100         {},
 101 };
 102
 103 MODULE_DEVICE_TABLE(of, rk_ohci_of_match);
 104
 105 /* ohci_hcd_rk_probe - initialize RK-based HCDs
 106  * Allocates basic resources for this USB host controller, and
 107  * then invokes the start() method for the HCD associated with it
 108  * through the hotplug entry's driver_data.
 109  */
 110 static int ohci_hcd_rk_probe(struct platform_device *pdev)
 111 {
 112         struct device *dev = &pdev->dev;
 113         struct usb_hcd *hcd = NULL;
 114         void __iomem *regs = NULL;
 115         struct resource *res;
 116         int ret = -ENODEV;
 117         int irq;
 118         struct dwc_otg_platform_data *pldata;
 119         const struct of_device_id *match;
 120
 121         dev_dbg(&pdev->dev, "ohci_hcd_rk_probe\n");
 122
 123         if (usb_disabled())
 124                 return -ENODEV;
 125
 126         match = of_match_device(of_match_ptr(rk_ohci_of_match), &pdev->dev);
 127         if (match && match->data) {
 128                 pldata = (struct dwc_otg_platform_data *)match->data;
 129         } else {
 130                 dev_err(dev, "ohci_rk match failed\n");
 131                 return -EINVAL;
 132         }
 133
 134         pldata->dev = dev;
 135         dev->platform_data = pldata;
 136
 137         if (pldata->hw_init)
 138                 pldata->hw_init();
 139
 140         if (pldata->clock_init) {
 141                 pldata->clock_init(pldata);
 142                 pldata->clock_enable(pldata, 1);
 143         }
 144
 145         irq = platform_get_irq(pdev, 0);
 146         if (irq < 0) {
 147                 dev_err(dev, "OHCI irq failed\n");
 148                 ret = irq;
 149                 goto clk_disable;
 150         }
 151
 152         if (!pdev->dev.dma_mask)
 153                 pdev->dev.dma_mask = &pdev->dev.coherent_dma_mask;
 154         dma_set_coherent_mask(&pdev->dev, DMA_BIT_MASK(32));
 155
 156
 157         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 158         if (!res) {
 159                 dev_err(dev, "UHH OHCI get resource failed\n");
 160                 ret = -ENOMEM;
 161                 goto clk_disable;
 162         }
 163
 164         regs = devm_ioremap_resource(dev, res);
 165         if (!regs) {
 166                 dev_err(dev, "UHH OHCI ioremap failed\n");
 167                 ret = -ENOMEM;
 168                 goto clk_disable;
 169         }
 170
 171         /*
 172          * Right now device-tree probed devices don't get dma_mask set.
 173          * Since shared usb code relies on it, set it here for now.
 174          * Once we have dma capability bindings this can go away.
 175          */
 176         if (!dev->dma_mask)
 177                 dev->dma_mask = &dev->coherent_dma_mask;
 178         if (!dev->coherent_dma_mask)
 179                 dev->coherent_dma_mask = DMA_BIT_MASK(32);
 180
 181         hcd = usb_create_hcd(&ohci_rk_hc_driver, dev, dev_name(dev));
 182         if (!hcd) {
 183                 dev_err(dev, "usb_create_hcd failed\n");
 184                 ret = -ENOMEM;
 185                 goto clk_disable;
 186         }
 187
 188         hcd->rsrc_start = res->start;
 189         hcd->rsrc_len = resource_size(res);
 190         hcd->regs = regs;
 191
 192         ohci_hcd_init(hcd_to_ohci(hcd));
 193
 194         ret = usb_add_hcd(hcd, irq, 0);
 195         if (ret) {
 196                 dev_dbg(dev, "failed to add hcd with err %d\n", ret);
 197                 goto err_add_hcd;
 198         }
 199
 200         return 0;
 201
 202 err_add_hcd:
 203         usb_put_hcd(hcd);
 204
 205 clk_disable:
 206         if (pldata->clock_enable)
 207                 pldata->clock_enable(pldata, 0);
 208
 209         return ret;
 210 }
 211
 212 static int ohci_hcd_rk_remove(struct platform_device *pdev)
 213 {
 214         struct device *dev = &pdev->dev;
 215         struct usb_hcd *hcd = dev_get_drvdata(dev);
 216
 217         usb_remove_hcd(hcd);
 218         usb_put_hcd(hcd);
 219         return 0;
 220 }
 221
 222 static void ohci_hcd_rk_shutdown(struct platform_device *pdev)
 223 {
 224         struct usb_hcd *hcd = dev_get_drvdata(&pdev->dev);
 225
 226         if (hcd->driver->shutdown)
 227                 hcd->driver->shutdown(hcd);
 228 }
 229
 230 static struct platform_driver ohci_hcd_rk_driver = {
 231         .probe = ohci_hcd_rk_probe,
 232         .remove = ohci_hcd_rk_remove,
 233         .shutdown = ohci_hcd_rk_shutdown,
 234         .driver = {
 235                    .name = "ohci-rockchip",
 236                    .of_match_table = of_match_ptr(rk_ohci_of_match),
 237                    },
 238 };
 239
 240 MODULE_ALIAS("platform:rockchip-ohci");