drivers/usb/host/ehci-mxs.c

   1 /*
   2  * Freescale i.MX28 USB Host driver
   3  *
   4  * Copyright (C) 2011 Marek Vasut <marek.vasut@gmail.com>
   5  * on behalf of DENX Software Engineering GmbH
   6  *
   7  * This program is free software; you can redistribute it and/or modify
   8  * it under the terms of the GNU General Public License as published by
   9  * the Free Software Foundation; either version 2 of the License, or
  10  * (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., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  20  */
  21
  22 #include <common.h>
  23 #include <asm/io.h>
  24 #include <asm/arch/regs-common.h>
  25 #include <asm/arch/regs-base.h>
  26 #include <asm/arch/regs-clkctrl.h>
  27 #include <asm/arch/regs-usb.h>
  28 #include <asm/arch/regs-usbphy.h>
  29
  30 #include "ehci-core.h"
  31 #include "ehci.h"
  32
  33 #if     (CONFIG_EHCI_MXS_PORT != 0) && (CONFIG_EHCI_MXS_PORT != 1)
  34 #error  "MXS EHCI: Invalid port selected!"
  35 #endif
  36
  37 #ifndef CONFIG_EHCI_MXS_PORT
  38 #error  "MXS EHCI: Please define correct port using CONFIG_EHCI_MXS_PORT!"
  39 #endif
  40
  41 static struct ehci_mxs {
  42         struct mx28_usb_regs    *usb_regs;
  43         struct mx28_usbphy_regs *phy_regs;
  44 } ehci_mxs;
  45
  46 int mxs_ehci_get_port(struct ehci_mxs *mxs_usb, int port)
  47 {
  48         uint32_t usb_base, phy_base;
  49         switch (port) {
  50         case 0:
  51                 usb_base = MXS_USBCTRL0_BASE;
  52                 phy_base = MXS_USBPHY0_BASE;
  53                 break;
  54         case 1:
  55                 usb_base = MXS_USBCTRL1_BASE;
  56                 phy_base = MXS_USBPHY1_BASE;
  57                 break;
  58         default:
  59                 printf("CONFIG_EHCI_MXS_PORT (port = %d)\n", port);
  60                 return -1;
  61         }
  62
  63         mxs_usb->usb_regs = (struct mx28_usb_regs *)usb_base;
  64         mxs_usb->phy_regs = (struct mx28_usbphy_regs *)phy_base;
  65         return 0;
  66 }
  67
  68 /* This DIGCTL register ungates clock to USB */
  69 #define HW_DIGCTL_CTRL                  0x8001c000
  70 #define HW_DIGCTL_CTRL_USB0_CLKGATE     (1 << 2)
  71 #define HW_DIGCTL_CTRL_USB1_CLKGATE     (1 << 16)
  72
  73 int ehci_hcd_init(void)
  74 {
  75
  76         int ret;
  77         uint32_t usb_base, cap_base;
  78         struct mx28_register_32 *digctl_ctrl =
  79                 (struct mx28_register_32 *)HW_DIGCTL_CTRL;
  80         struct mx28_clkctrl_regs *clkctrl_regs =
  81                 (struct mx28_clkctrl_regs *)MXS_CLKCTRL_BASE;
  82
  83         ret = mxs_ehci_get_port(&ehci_mxs, CONFIG_EHCI_MXS_PORT);
  84         if (ret)
  85                 return ret;
  86
  87         /* Reset the PHY block */
  88         writel(USBPHY_CTRL_SFTRST, &ehci_mxs.phy_regs->hw_usbphy_ctrl_set);
  89         udelay(10);
  90         writel(USBPHY_CTRL_SFTRST | USBPHY_CTRL_CLKGATE,
  91                 &ehci_mxs.phy_regs->hw_usbphy_ctrl_clr);
  92
  93         /* Enable USB clock */
  94         writel(CLKCTRL_PLL0CTRL0_EN_USB_CLKS | CLKCTRL_PLL0CTRL0_POWER,
  95                         &clkctrl_regs->hw_clkctrl_pll0ctrl0_set);
  96         writel(CLKCTRL_PLL1CTRL0_EN_USB_CLKS | CLKCTRL_PLL1CTRL0_POWER,
  97                         &clkctrl_regs->hw_clkctrl_pll1ctrl0_set);
  98
  99         writel(HW_DIGCTL_CTRL_USB0_CLKGATE | HW_DIGCTL_CTRL_USB1_CLKGATE,
 100                 &digctl_ctrl->reg_clr);
 101
 102         /* Start USB PHY */
 103         writel(0, &ehci_mxs.phy_regs->hw_usbphy_pwd);
 104
 105         /* Enable UTMI+ Level 2 and Level 3 compatibility */
 106         writel(USBPHY_CTRL_ENUTMILEVEL3 | USBPHY_CTRL_ENUTMILEVEL2 | 1,
 107                 &ehci_mxs.phy_regs->hw_usbphy_ctrl_set);
 108
 109         usb_base = ((uint32_t)ehci_mxs.usb_regs) + 0x100;
 110         hccr = (struct ehci_hccr *)usb_base;
 111
 112         cap_base = ehci_readl(&hccr->cr_capbase);
 113         hcor = (struct ehci_hcor *)(usb_base + HC_LENGTH(cap_base));
 114
 115         return 0;
 116 }
 117
 118 int ehci_hcd_stop(void)
 119 {
 120         int ret;
 121         uint32_t tmp;
 122         struct mx28_register_32 *digctl_ctrl =
 123                 (struct mx28_register_32 *)HW_DIGCTL_CTRL;
 124         struct mx28_clkctrl_regs *clkctrl_regs =
 125                 (struct mx28_clkctrl_regs *)MXS_CLKCTRL_BASE;
 126
 127         ret = mxs_ehci_get_port(&ehci_mxs, CONFIG_EHCI_MXS_PORT);
 128         if (ret)
 129                 return ret;
 130
 131         /* Stop the USB port */
 132         tmp = ehci_readl(&hcor->or_usbcmd);
 133         tmp &= ~CMD_RUN;
 134         ehci_writel(tmp, &hcor->or_usbcmd);
 135
 136         /* Disable the PHY */
 137         tmp = USBPHY_PWD_RXPWDRX | USBPHY_PWD_RXPWDDIFF |
 138                 USBPHY_PWD_RXPWD1PT1 | USBPHY_PWD_RXPWDENV |
 139                 USBPHY_PWD_TXPWDV2I | USBPHY_PWD_TXPWDIBIAS |
 140                 USBPHY_PWD_TXPWDFS;
 141         writel(tmp, &ehci_mxs.phy_regs->hw_usbphy_pwd);
 142
 143         /* Disable USB clock */
 144         writel(CLKCTRL_PLL0CTRL0_EN_USB_CLKS,
 145                         &clkctrl_regs->hw_clkctrl_pll0ctrl0_clr);
 146         writel(CLKCTRL_PLL1CTRL0_EN_USB_CLKS,
 147                         &clkctrl_regs->hw_clkctrl_pll1ctrl0_clr);
 148
 149         /* Gate off the USB clock */
 150         writel(HW_DIGCTL_CTRL_USB0_CLKGATE | HW_DIGCTL_CTRL_USB1_CLKGATE,
 151                 &digctl_ctrl->reg_set);
 152
 153         return 0;
 154 }