LXR linux/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
  14static int __devinit
  15cns3xxx_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
  51static 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
  73static 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 = res->end - res->start + 1;
 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);
 126err2:
 127        release_mem_region(hcd->rsrc_start, hcd->rsrc_len);
 128err1:
 129        usb_put_hcd(hcd);
 130        return retval;
 131}
 132
 133static 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
 157MODULE_ALIAS("platform:cns3xxx-ohci");
 158
 159static 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};
 166