drivers/usb/host/ehci-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 cns3xxx_ehci_init(struct usb_hcd *hcd)
  15 {
  16         struct ehci_hcd *ehci = hcd_to_ehci(hcd);
  17         int retval;
  18
  19         /*
  20          * EHCI and OHCI share the same clock and power,
  21          * resetting twice would cause the 1st controller been reset.
  22          * Therefore only do power up  at the first up device, and
  23          * power down at the last down device.
  24          *
  25          * Set USB AHB INCR length to 16
  26          */
  27         if (atomic_inc_return(&usb_pwr_ref) == 1) {
  28                 cns3xxx_pwr_power_up(1 << PM_PLL_HM_PD_CTRL_REG_OFFSET_PLL_USB);
  29                 cns3xxx_pwr_clk_en(1 << PM_CLK_GATE_REG_OFFSET_USB_HOST);
  30                 cns3xxx_pwr_soft_rst(1 << PM_SOFT_RST_REG_OFFST_USB_HOST);
  31                 __raw_writel((__raw_readl(MISC_CHIP_CONFIG_REG) | (0X2 << 24)),
  32                         MISC_CHIP_CONFIG_REG);
  33         }
  34
  35         ehci->caps = hcd->regs;
  36
  37         hcd->has_tt = 0;
  38
  39         retval = ehci_setup(hcd);
  40         if (retval)
  41                 return retval;
  42
  43         ehci_port_power(ehci, 0);
  44
  45         return retval;
  46 }
  47
  48 static const struct hc_driver cns3xxx_ehci_hc_driver = {
  49         .description            = hcd_name,
  50         .product_desc           = "CNS3XXX EHCI Host Controller",
  51         .hcd_priv_size          = sizeof(struct ehci_hcd),
  52         .irq                    = ehci_irq,
  53         .flags                  = HCD_MEMORY | HCD_USB2,
  54         .reset                  = cns3xxx_ehci_init,
  55         .start                  = ehci_run,
  56         .stop                   = ehci_stop,
  57         .shutdown               = ehci_shutdown,
  58         .urb_enqueue            = ehci_urb_enqueue,
  59         .urb_dequeue            = ehci_urb_dequeue,
  60         .endpoint_disable       = ehci_endpoint_disable,
  61         .endpoint_reset         = ehci_endpoint_reset,
  62         .get_frame_number       = ehci_get_frame,
  63         .hub_status_data        = ehci_hub_status_data,
  64         .hub_control            = ehci_hub_control,
  65 #ifdef CONFIG_PM
  66         .bus_suspend            = ehci_bus_suspend,
  67         .bus_resume             = ehci_bus_resume,
  68 #endif
  69         .relinquish_port        = ehci_relinquish_port,
  70         .port_handed_over       = ehci_port_handed_over,
  71
  72         .clear_tt_buffer_complete       = ehci_clear_tt_buffer_complete,
  73 };
  74
  75 static int cns3xxx_ehci_probe(struct platform_device *pdev)
  76 {
  77         struct device *dev = &pdev->dev;
  78         struct usb_hcd *hcd;
  79         const struct hc_driver *driver = &cns3xxx_ehci_hc_driver;
  80         struct resource *res;
  81         int irq;
  82         int retval;
  83
  84         if (usb_disabled())
  85                 return -ENODEV;
  86
  87         res = platform_get_resource(pdev, IORESOURCE_IRQ, 0);
  88         if (!res) {
  89                 dev_err(dev, "Found HC with no IRQ.\n");
  90                 return -ENODEV;
  91         }
  92         irq = res->start;
  93
  94         hcd = usb_create_hcd(driver, &pdev->dev, dev_name(&pdev->dev));
  95         if (!hcd)
  96                 return -ENOMEM;
  97
  98         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
  99         if (!res) {
 100                 dev_err(dev, "Found HC with no register addr.\n");
 101                 retval = -ENODEV;
 102                 goto err1;
 103         }
 104
 105         hcd->rsrc_start = res->start;
 106         hcd->rsrc_len = resource_size(res);
 107
 108         if (!request_mem_region(hcd->rsrc_start, hcd->rsrc_len,
 109                                 driver->description)) {
 110                 dev_dbg(dev, "controller already in use\n");
 111                 retval = -EBUSY;
 112                 goto err1;
 113         }
 114
 115         hcd->regs = ioremap(hcd->rsrc_start, hcd->rsrc_len);
 116         if (hcd->regs == NULL) {
 117                 dev_dbg(dev, "error mapping memory\n");
 118                 retval = -EFAULT;
 119                 goto err2;
 120         }
 121
 122         retval = usb_add_hcd(hcd, irq, IRQF_SHARED);
 123         if (retval == 0)
 124                 return retval;
 125
 126         iounmap(hcd->regs);
 127 err2:
 128         release_mem_region(hcd->rsrc_start, hcd->rsrc_len);
 129 err1:
 130         usb_put_hcd(hcd);
 131
 132         return retval;
 133 }
 134
 135 static int cns3xxx_ehci_remove(struct platform_device *pdev)
 136 {
 137         struct usb_hcd *hcd = platform_get_drvdata(pdev);
 138
 139         usb_remove_hcd(hcd);
 140         iounmap(hcd->regs);
 141         release_mem_region(hcd->rsrc_start, hcd->rsrc_len);
 142
 143         /*
 144          * EHCI and OHCI share the same clock and power,
 145          * resetting twice would cause the 1st controller been reset.
 146          * Therefore only do power up  at the first up device, and
 147          * power down at the last down device.
 148          */
 149         if (atomic_dec_return(&usb_pwr_ref) == 0)
 150                 cns3xxx_pwr_clk_dis(1 << PM_CLK_GATE_REG_OFFSET_USB_HOST);
 151
 152         usb_put_hcd(hcd);
 153
 154         platform_set_drvdata(pdev, NULL);
 155
 156         return 0;
 157 }
 158
 159 MODULE_ALIAS("platform:cns3xxx-ehci");
 160
 161 static struct platform_driver cns3xxx_ehci_driver = {
 162         .probe = cns3xxx_ehci_probe,
 163         .remove = cns3xxx_ehci_remove,
 164         .driver = {
 165                 .name = "cns3xxx-ehci",
 166         },
 167 };