drivers/usb/host/ohci-cns3xxx.c

   1 /*
   2  * Copyright 2008 Cavium Networks
   3  *
   4  * This file is free software; you can redistribute it and/or modify
   5  * it under the terms of the GNU General Public License, Version 2, as
   6  * published by the Free Software Foundation.
   7  */
   8
   9 #include <linux/platform_device.h>
  10 #include <linux/atomic.h>
  11 #include <mach/cns3xxx.h>
  12 #include <mach/pm.h>
  13
  14 static int __devinit
  15 cns3xxx_ohci_start(struct usb_hcd *hcd)
  16 {
  17         struct ohci_hcd *ohci = hcd_to_ohci(hcd);
  18         int ret;
  19
  20         /*
  21          * EHCI and OHCI share the same clock and power,
  22          * resetting twice would cause the 1st controller been reset.
  23          * Therefore only do power up  at the first up device, and
  24          * power down at the last down device.
  25          *
  26          * Set USB AHB INCR length to 16
  27          */
  28         if (atomic_inc_return(&usb_pwr_ref) == 1) {
  29                 cns3xxx_pwr_power_up(1 << PM_PLL_HM_PD_CTRL_REG_OFFSET_PLL_USB);
  30                 cns3xxx_pwr_clk_en(1 << PM_CLK_GATE_REG_OFFSET_USB_HOST);
  31                 cns3xxx_pwr_soft_rst(1 << PM_SOFT_RST_REG_OFFST_USB_HOST);
  32                 __raw_writel((__raw_readl(MISC_CHIP_CONFIG_REG) | (0X2 << 24)),
  33                         MISC_CHIP_CONFIG_REG);
  34         }
  35
  36         ret = ohci_init(ohci);
  37         if (ret < 0)
  38                 return ret;
  39
  40         ohci->num_ports = 1;
  41
  42         ret = ohci_run(ohci);
  43         if (ret < 0) {
  44                 err("can't start %s", hcd->self.bus_name);
  45                 ohci_stop(hcd);
  46                 return ret;
  47         }
  48         return 0;
  49 }
  50
  51 static const struct hc_driver cns3xxx_ohci_hc_driver = {
  52         .description            = hcd_name,
  53         .product_desc           = "CNS3XXX OHCI Host controller",
  54         .hcd_priv_size          = sizeof(struct ohci_hcd),
  55         .irq                    = ohci_irq,
  56         .flags                  = HCD_USB11 | HCD_MEMORY,
  57         .start                  = cns3xxx_ohci_start,
  58         .stop                   = ohci_stop,
  59         .shutdown               = ohci_shutdown,
  60         .urb_enqueue            = ohci_urb_enqueue,
  61         .urb_dequeue            = ohci_urb_dequeue,
  62         .endpoint_disable       = ohci_endpoint_disable,
  63         .get_frame_number       = ohci_get_frame,
  64         .hub_status_data        = ohci_hub_status_data,
  65         .hub_control            = ohci_hub_control,
  66 #ifdef CONFIG_PM
  67         .bus_suspend            = ohci_bus_suspend,
  68         .bus_resume             = ohci_bus_resume,
  69 #endif
  70         .start_port_reset       = ohci_start_port_reset,
  71 };
  72
  73 static int cns3xxx_ohci_probe(struct platform_device *pdev)
  74 {
  75         struct device *dev = &pdev->dev;
  76         struct usb_hcd *hcd;
  77         const struct hc_driver *driver = &cns3xxx_ohci_hc_driver;
  78         struct resource *res;
  79         int irq;
  80         int retval;
  81
  82         if (usb_disabled())
  83                 return -ENODEV;
  84
  85         res = platform_get_resource(pdev, IORESOURCE_IRQ, 0);
  86         if (!res) {
  87                 dev_err(dev, "Found HC with no IRQ.\n");
  88                 return -ENODEV;
  89         }
  90         irq = res->start;
  91
  92         hcd = usb_create_hcd(driver, dev, dev_name(dev));
  93         if (!hcd)
  94                 return -ENOMEM;
  95
  96         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
  97         if (!res) {
  98                 dev_err(dev, "Found HC with no register addr.\n");
  99                 retval = -ENODEV;
 100                 goto err1;
 101         }
 102         hcd->rsrc_start = res->start;
 103         hcd->rsrc_len = resource_size(res);
 104
 105         if (!request_mem_region(hcd->rsrc_start, hcd->rsrc_len,
 106                         driver->description)) {
 107                 dev_dbg(dev, "controller already in use\n");
 108                 retval = -EBUSY;
 109                 goto err1;
 110         }
 111
 112         hcd->regs = ioremap(hcd->rsrc_start, hcd->rsrc_len);
 113         if (!hcd->regs) {
 114                 dev_dbg(dev, "error mapping memory\n");
 115                 retval = -EFAULT;
 116                 goto err2;
 117         }
 118
 119         ohci_hcd_init(hcd_to_ohci(hcd));
 120
 121         retval = usb_add_hcd(hcd, irq, IRQF_SHARED);
 122         if (retval == 0)
 123                 return retval;
 124
 125         iounmap(hcd->regs);
 126 err2:
 127         release_mem_region(hcd->rsrc_start, hcd->rsrc_len);
 128 err1:
 129         usb_put_hcd(hcd);
 130         return retval;
 131 }
 132
 133 static int cns3xxx_ohci_remove(struct platform_device *pdev)
 134 {
 135         struct usb_hcd *hcd = platform_get_drvdata(pdev);
 136
 137         usb_remove_hcd(hcd);
 138         iounmap(hcd->regs);
 139         release_mem_region(hcd->rsrc_start, hcd->rsrc_len);
 140
 141         /*
 142          * EHCI and OHCI share the same clock and power,
 143          * resetting twice would cause the 1st controller been reset.
 144          * Therefore only do power up  at the first up device, and
 145          * power down at the last down device.
 146          */
 147         if (atomic_dec_return(&usb_pwr_ref) == 0)
 148                 cns3xxx_pwr_clk_dis(1 << PM_CLK_GATE_REG_OFFSET_USB_HOST);
 149
 150         usb_put_hcd(hcd);
 151
 152         platform_set_drvdata(pdev, NULL);
 153
 154         return 0;
 155 }
 156
 157 MODULE_ALIAS("platform:cns3xxx-ohci");
 158
 159 static struct platform_driver ohci_hcd_cns3xxx_driver = {
 160         .probe = cns3xxx_ohci_probe,
 161         .remove = cns3xxx_ohci_remove,
 162         .driver = {
 163                 .name = "cns3xxx-ohci",
 164         },
 165 };