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                dev_err(hcd->self.controller, "can't start %s\n",
  45                        hcd->self.bus_name);
  46                ohci_stop(hcd);
  47                return ret;
  48        }
  49        return 0;
  50}
  51
  52static const struct hc_driver cns3xxx_ohci_hc_driver = {
  53        .description            = hcd_name,
  54        .product_desc           = "CNS3XXX OHCI Host controller",
  55        .hcd_priv_size          = sizeof(struct ohci_hcd),
  56        .irq                    = ohci_irq,
  57        .flags                  = HCD_USB11 | HCD_MEMORY,
  58        .start                  = cns3xxx_ohci_start,
  59        .stop                   = ohci_stop,
  60        .shutdown               = ohci_shutdown,
  61        .urb_enqueue            = ohci_urb_enqueue,
  62        .urb_dequeue            = ohci_urb_dequeue,
  63        .endpoint_disable       = ohci_endpoint_disable,
  64        .get_frame_number       = ohci_get_frame,
  65        .hub_status_data        = ohci_hub_status_data,
  66        .hub_control            = ohci_hub_control,
  67#ifdef CONFIG_PM
  68        .bus_suspend            = ohci_bus_suspend,
  69        .bus_resume             = ohci_bus_resume,
  70#endif
  71        .start_port_reset       = ohci_start_port_reset,
  72};
  73
  74static int cns3xxx_ohci_probe(struct platform_device *pdev)
  75{
  76        struct device *dev = &pdev->dev;
  77        struct usb_hcd *hcd;
  78        const struct hc_driver *driver = &cns3xxx_ohci_hc_driver;
  79        struct resource *res;
  80        int irq;
  81        int retval;
  82
  83        if (usb_disabled())
  84                return -ENODEV;
  85
  86        res = platform_get_resource(pdev, IORESOURCE_IRQ, 0);
  87        if (!res) {
  88                dev_err(dev, "Found HC with no IRQ.\n");
  89                return -ENODEV;
  90        }
  91        irq = res->start;
  92
  93        hcd = usb_create_hcd(driver, dev, dev_name(dev));
  94        if (!hcd)
  95                return -ENOMEM;
  96
  97        res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
  98        if (!res) {
  99                dev_err(dev, "Found HC with no register addr.\n");
 100                retval = -ENODEV;
 101                goto err1;
 102        }
 103        hcd->rsrc_start = res->start;
 104        hcd->rsrc_len = resource_size(res);
 105
 106        if (!request_mem_region(hcd->rsrc_start, hcd->rsrc_len,
 107                        driver->description)) {
 108                dev_dbg(dev, "controller already in use\n");
 109                retval = -EBUSY;
 110                goto err1;
 111        }
 112
 113        hcd->regs = ioremap(hcd->rsrc_start, hcd->rsrc_len);
 114        if (!hcd->regs) {
 115                dev_dbg(dev, "error mapping memory\n");
 116                retval = -EFAULT;
 117                goto err2;
 118        }
 119
 120        ohci_hcd_init(hcd_to_ohci(hcd));
 121
 122        retval = usb_add_hcd(hcd, irq, IRQF_SHARED);
 123        if (retval == 0)
 124                return retval;
 125
 126        iounmap(hcd->regs);
 127err2:
 128        release_mem_region(hcd->rsrc_start, hcd->rsrc_len);
 129err1:
 130        usb_put_hcd(hcd);
 131        return retval;
 132}
 133
 134static int cns3xxx_ohci_remove(struct platform_device *pdev)
 135{
 136        struct usb_hcd *hcd = platform_get_drvdata(pdev);
 137
 138        usb_remove_hcd(hcd);
 139        iounmap(hcd->regs);
 140        release_mem_region(hcd->rsrc_start, hcd->rsrc_len);
 141
 142        /*
 143         * EHCI and OHCI share the same clock and power,
 144         * resetting twice would cause the 1st controller been reset.
 145         * Therefore only do power up  at the first up device, and
 146         * power down at the last down device.
 147         */
 148        if (atomic_dec_return(&usb_pwr_ref) == 0)
 149                cns3xxx_pwr_clk_dis(1 << PM_CLK_GATE_REG_OFFSET_USB_HOST);
 150
 151        usb_put_hcd(hcd);
 152
 153        platform_set_drvdata(pdev, NULL);
 154
 155        return 0;
 156}
 157
 158MODULE_ALIAS("platform:cns3xxx-ohci");
 159
 160static struct platform_driver ohci_hcd_cns3xxx_driver = {
 161        .probe = cns3xxx_ohci_probe,
 162        .remove = cns3xxx_ohci_remove,
 163        .driver = {
 164                .name = "cns3xxx-ohci",
 165        },
 166};
 167