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         ehci->regs = hcd->regs
  37                 + HC_LENGTH(ehci, ehci_readl(ehci, &ehci->caps->hc_capbase));
  38         ehci->hcs_params = ehci_readl(ehci, &ehci->caps->hcs_params);
  39
  40         hcd->has_tt = 0;
  41         ehci_reset(ehci);
  42
  43         retval = ehci_init(hcd);
  44         if (retval)
  45                 return retval;
  46
  47         ehci_port_power(ehci, 0);
  48
  49         return retval;
  50 }
  51
  52 static const struct hc_driver cns3xxx_ehci_hc_driver = {
  53         .description            = hcd_name,
  54         .product_desc           = "CNS3XXX EHCI Host Controller",
  55         .hcd_priv_size          = sizeof(struct ehci_hcd),
  56         .irq                    = ehci_irq,
  57         .flags                  = HCD_MEMORY | HCD_USB2,
  58         .reset                  = cns3xxx_ehci_init,
  59         .start                  = ehci_run,
  60         .stop                   = ehci_stop,
  61         .shutdown               = ehci_shutdown,
  62         .urb_enqueue            = ehci_urb_enqueue,
  63         .urb_dequeue            = ehci_urb_dequeue,
  64         .endpoint_disable       = ehci_endpoint_disable,
  65         .endpoint_reset         = ehci_endpoint_reset,
  66         .get_frame_number       = ehci_get_frame,
  67         .hub_status_data        = ehci_hub_status_data,
  68         .hub_control            = ehci_hub_control,
  69 #ifdef CONFIG_PM
  70         .bus_suspend            = ehci_bus_suspend,
  71         .bus_resume             = ehci_bus_resume,
  72 #endif
  73         .relinquish_port        = ehci_relinquish_port,
  74         .port_handed_over       = ehci_port_handed_over,
  75
  76         .clear_tt_buffer_complete       = ehci_clear_tt_buffer_complete,
  77 };
  78
  79 static int cns3xxx_ehci_probe(struct platform_device *pdev)
  80 {
  81         struct device *dev = &pdev->dev;
  82         struct usb_hcd *hcd;
  83         const struct hc_driver *driver = &cns3xxx_ehci_hc_driver;
  84         struct resource *res;
  85         int irq;
  86         int retval;
  87
  88         if (usb_disabled())
  89                 return -ENODEV;
  90
  91         res = platform_get_resource(pdev, IORESOURCE_IRQ, 0);
  92         if (!res) {
  93                 dev_err(dev, "Found HC with no IRQ.\n");
  94                 return -ENODEV;
  95         }
  96         irq = res->start;
  97
  98         hcd = usb_create_hcd(driver, &pdev->dev, dev_name(&pdev->dev));
  99         if (!hcd)
 100                 return -ENOMEM;
 101
 102         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 103         if (!res) {
 104                 dev_err(dev, "Found HC with no register addr.\n");
 105                 retval = -ENODEV;
 106                 goto err1;
 107         }
 108
 109         hcd->rsrc_start = res->start;
 110         hcd->rsrc_len = resource_size(res);
 111
 112         if (!request_mem_region(hcd->rsrc_start, hcd->rsrc_len,
 113                                 driver->description)) {
 114                 dev_dbg(dev, "controller already in use\n");
 115                 retval = -EBUSY;
 116                 goto err1;
 117         }
 118
 119         hcd->regs = ioremap(hcd->rsrc_start, hcd->rsrc_len);
 120         if (hcd->regs == NULL) {
 121                 dev_dbg(dev, "error mapping memory\n");
 122                 retval = -EFAULT;
 123                 goto err2;
 124         }
 125
 126         retval = usb_add_hcd(hcd, irq, IRQF_SHARED);
 127         if (retval == 0)
 128                 return retval;
 129
 130         iounmap(hcd->regs);
 131 err2:
 132         release_mem_region(hcd->rsrc_start, hcd->rsrc_len);
 133 err1:
 134         usb_put_hcd(hcd);
 135
 136         return retval;
 137 }
 138
 139 static int cns3xxx_ehci_remove(struct platform_device *pdev)
 140 {
 141         struct usb_hcd *hcd = platform_get_drvdata(pdev);
 142
 143         usb_remove_hcd(hcd);
 144         iounmap(hcd->regs);
 145         release_mem_region(hcd->rsrc_start, hcd->rsrc_len);
 146
 147         /*
 148          * EHCI and OHCI share the same clock and power,
 149          * resetting twice would cause the 1st controller been reset.
 150          * Therefore only do power up  at the first up device, and
 151          * power down at the last down device.
 152          */
 153         if (atomic_dec_return(&usb_pwr_ref) == 0)
 154                 cns3xxx_pwr_clk_dis(1 << PM_CLK_GATE_REG_OFFSET_USB_HOST);
 155
 156         usb_put_hcd(hcd);
 157
 158         platform_set_drvdata(pdev, NULL);
 159
 160         return 0;
 161 }
 162
 163 MODULE_ALIAS("platform:cns3xxx-ehci");
 164
 165 static struct platform_driver cns3xxx_ehci_driver = {
 166         .probe = cns3xxx_ehci_probe,
 167         .remove = cns3xxx_ehci_remove,
 168         .driver = {
 169                 .name = "cns3xxx-ehci",
 170         },
 171 };