drivers/usb/host/ehci-exynos.c

   1 /*
   2  * SAMSUNG EXYNOS USB HOST EHCI Controller
   3  *
   4  * Copyright (C) 2012 Samsung Electronics Co.Ltd
   5  *      Vivek Gautam <gautam.vivek@samsung.com>
   6  *
   7  * This program is free software; you can redistribute it and/or
   8  * modify it under the terms of the GNU General Public License as
   9  * published by the Free Software Foundation; either version 2 of
  10  * the License, or (at your option) any later version.
  11  *
  12  * This program is distributed in the hope that it will be useful,
  13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
  15  * GNU General Public License for more details.
  16  *
  17  * You should have received a copy of the GNU General Public License
  18  * along with this program; if not, write to the Free Software
  19  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
  20  * MA 02110-1301 USA
  21  */
  22
  23 #include <common.h>
  24 #include <usb.h>
  25 #include <asm/arch/cpu.h>
  26 #include <asm/arch/ehci.h>
  27 #include <asm/arch/system.h>
  28 #include <asm/arch/power.h>
  29 #include "ehci.h"
  30
  31 /* Setup the EHCI host controller. */
  32 static void setup_usb_phy(struct exynos_usb_phy *usb)
  33 {
  34         set_usbhost_mode(USB20_PHY_CFG_HOST_LINK_EN);
  35
  36         set_usbhost_phy_ctrl(POWER_USB_HOST_PHY_CTRL_EN);
  37
  38         clrbits_le32(&usb->usbphyctrl0,
  39                         HOST_CTRL0_FSEL_MASK |
  40                         HOST_CTRL0_COMMONON_N |
  41                         /* HOST Phy setting */
  42                         HOST_CTRL0_PHYSWRST |
  43                         HOST_CTRL0_PHYSWRSTALL |
  44                         HOST_CTRL0_SIDDQ |
  45                         HOST_CTRL0_FORCESUSPEND |
  46                         HOST_CTRL0_FORCESLEEP);
  47
  48         setbits_le32(&usb->usbphyctrl0,
  49                         /* Setting up the ref freq */
  50                         (CLK_24MHZ << 16) |
  51                         /* HOST Phy setting */
  52                         HOST_CTRL0_LINKSWRST |
  53                         HOST_CTRL0_UTMISWRST);
  54         udelay(10);
  55         clrbits_le32(&usb->usbphyctrl0,
  56                         HOST_CTRL0_LINKSWRST |
  57                         HOST_CTRL0_UTMISWRST);
  58         udelay(20);
  59
  60         /* EHCI Ctrl setting */
  61         setbits_le32(&usb->ehcictrl,
  62                         EHCICTRL_ENAINCRXALIGN |
  63                         EHCICTRL_ENAINCR4 |
  64                         EHCICTRL_ENAINCR8 |
  65                         EHCICTRL_ENAINCR16);
  66 }
  67
  68 /* Reset the EHCI host controller. */
  69 static void reset_usb_phy(struct exynos_usb_phy *usb)
  70 {
  71         /* HOST_PHY reset */
  72         setbits_le32(&usb->usbphyctrl0,
  73                         HOST_CTRL0_PHYSWRST |
  74                         HOST_CTRL0_PHYSWRSTALL |
  75                         HOST_CTRL0_SIDDQ |
  76                         HOST_CTRL0_FORCESUSPEND |
  77                         HOST_CTRL0_FORCESLEEP);
  78
  79         set_usbhost_phy_ctrl(POWER_USB_HOST_PHY_CTRL_DISABLE);
  80 }
  81
  82 /*
  83  * EHCI-initialization
  84  * Create the appropriate control structures to manage
  85  * a new EHCI host controller.
  86  */
  87 int ehci_hcd_init(int index, struct ehci_hccr **hccr, struct ehci_hcor **hcor)
  88 {
  89         struct exynos_usb_phy *usb;
  90
  91         usb = (struct exynos_usb_phy *)samsung_get_base_usb_phy();
  92         setup_usb_phy(usb);
  93
  94         *hccr = (struct ehci_hccr *)samsung_get_base_usb_ehci();
  95         *hcor = (struct ehci_hcor *)((uint32_t) *hccr
  96                                 + HC_LENGTH(ehci_readl(&(*hccr)->cr_capbase)));
  97
  98         debug("Exynos5-ehci: init hccr %x and hcor %x hc_length %d\n",
  99                 (uint32_t)*hccr, (uint32_t)*hcor,
 100                 (uint32_t)HC_LENGTH(ehci_readl(&(*hccr)->cr_capbase)));
 101
 102         return 0;
 103 }
 104
 105 /*
 106  * Destroy the appropriate control structures corresponding
 107  * the EHCI host controller.
 108  */
 109 int ehci_hcd_stop(int index)
 110 {
 111         struct exynos_usb_phy *usb;
 112
 113         usb = (struct exynos_usb_phy *)samsung_get_base_usb_phy();
 114         reset_usb_phy(usb);
 115
 116         return 0;
 117 }