drivers/usb/host/ehci-mxs.c

   1 /*
   2  * Freescale i.MX28 USB Host driver
   3  *
   4  * Copyright (C) 2011 Marek Vasut <[email protected]>
   5  * on behalf of DENX Software Engineering GmbH
   6  *
   7  * SPDX-License-Identifier:     GPL-2.0+
   8  */
   9
  10 #include <common.h>
  11 #include <asm/io.h>
  12 #include <asm/arch/imx-regs.h>
  13 #include <errno.h>
  14
  15 #include "ehci.h"
  16
  17 /* This DIGCTL register ungates clock to USB */
  18 #define HW_DIGCTL_CTRL                  0x8001c000
  19 #define HW_DIGCTL_CTRL_USB0_CLKGATE     (1 << 2)
  20 #define HW_DIGCTL_CTRL_USB1_CLKGATE     (1 << 16)
  21
  22 struct ehci_mxs_port {
  23         uint32_t                usb_regs;
  24         struct mxs_usbphy_regs  *phy_regs;
  25
  26         struct mxs_register_32  *pll;
  27         uint32_t                pll_en_bits;
  28         uint32_t                pll_dis_bits;
  29         uint32_t                gate_bits;
  30 };
  31
  32 static const struct ehci_mxs_port mxs_port[] = {
  33 #ifdef CONFIG_EHCI_MXS_PORT0
  34         {
  35                 MXS_USBCTRL0_BASE,
  36                 (struct mxs_usbphy_regs *)MXS_USBPHY0_BASE,
  37                 (struct mxs_register_32 *)(MXS_CLKCTRL_BASE +
  38                         offsetof(struct mxs_clkctrl_regs,
  39                         hw_clkctrl_pll0ctrl0_reg)),
  40                 CLKCTRL_PLL0CTRL0_EN_USB_CLKS | CLKCTRL_PLL0CTRL0_POWER,
  41                 CLKCTRL_PLL0CTRL0_EN_USB_CLKS,
  42                 HW_DIGCTL_CTRL_USB0_CLKGATE,
  43         },
  44 #endif
  45 #ifdef CONFIG_EHCI_MXS_PORT1
  46         {
  47                 MXS_USBCTRL1_BASE,
  48                 (struct mxs_usbphy_regs *)MXS_USBPHY1_BASE,
  49                 (struct mxs_register_32 *)(MXS_CLKCTRL_BASE +
  50                         offsetof(struct mxs_clkctrl_regs,
  51                         hw_clkctrl_pll1ctrl0_reg)),
  52                 CLKCTRL_PLL1CTRL0_EN_USB_CLKS | CLKCTRL_PLL1CTRL0_POWER,
  53                 CLKCTRL_PLL1CTRL0_EN_USB_CLKS,
  54                 HW_DIGCTL_CTRL_USB1_CLKGATE,
  55         },
  56 #endif
  57 };
  58
  59 static int ehci_mxs_toggle_clock(const struct ehci_mxs_port *port, int enable)
  60 {
  61         struct mxs_register_32 *digctl_ctrl =
  62                 (struct mxs_register_32 *)HW_DIGCTL_CTRL;
  63         int pll_offset, dig_offset;
  64
  65         if (enable) {
  66                 pll_offset = offsetof(struct mxs_register_32, reg_set);
  67                 dig_offset = offsetof(struct mxs_register_32, reg_clr);
  68                 writel(port->gate_bits, (u32)&digctl_ctrl->reg + dig_offset);
  69                 writel(port->pll_en_bits, (u32)port->pll + pll_offset);
  70         } else {
  71                 pll_offset = offsetof(struct mxs_register_32, reg_clr);
  72                 dig_offset = offsetof(struct mxs_register_32, reg_set);
  73                 writel(port->pll_dis_bits, (u32)port->pll + pll_offset);
  74                 writel(port->gate_bits, (u32)&digctl_ctrl->reg + dig_offset);
  75         }
  76
  77         return 0;
  78 }
  79
  80 int __weak board_ehci_hcd_init(int port)
  81 {
  82         return 0;
  83 }
  84
  85 int __weak board_ehci_hcd_exit(int port)
  86 {
  87         return 0;
  88 }
  89
  90 int ehci_hcd_init(int index, enum usb_init_type init,
  91                 struct ehci_hccr **hccr, struct ehci_hcor **hcor)
  92 {
  93
  94         int ret;
  95         uint32_t usb_base, cap_base;
  96         const struct ehci_mxs_port *port;
  97
  98         if ((index < 0) || (index >= ARRAY_SIZE(mxs_port))) {
  99                 printf("Invalid port index (index = %d)!\n", index);
 100                 return -EINVAL;
 101         }
 102
 103         ret = board_ehci_hcd_init(index);
 104         if (ret)
 105                 return ret;
 106
 107         port = &mxs_port[index];
 108
 109         /* Reset the PHY block */
 110         writel(USBPHY_CTRL_SFTRST, &port->phy_regs->hw_usbphy_ctrl_set);
 111         udelay(10);
 112         writel(USBPHY_CTRL_SFTRST | USBPHY_CTRL_CLKGATE,
 113                 &port->phy_regs->hw_usbphy_ctrl_clr);
 114
 115         /* Enable USB clock */
 116         ret = ehci_mxs_toggle_clock(port, 1);
 117         if (ret)
 118                 return ret;
 119
 120         /* Start USB PHY */
 121         writel(0, &port->phy_regs->hw_usbphy_pwd);
 122
 123         /* Enable UTMI+ Level 2 and Level 3 compatibility */
 124         writel(USBPHY_CTRL_ENUTMILEVEL3 | USBPHY_CTRL_ENUTMILEVEL2 | 1,
 125                 &port->phy_regs->hw_usbphy_ctrl_set);
 126
 127         usb_base = port->usb_regs + 0x100;
 128         *hccr = (struct ehci_hccr *)usb_base;
 129
 130         cap_base = ehci_readl(&(*hccr)->cr_capbase);
 131         *hcor = (struct ehci_hcor *)(usb_base + HC_LENGTH(cap_base));
 132
 133         return 0;
 134 }
 135
 136 int ehci_hcd_stop(int index)
 137 {
 138         int ret;
 139         uint32_t usb_base, cap_base, tmp;
 140         struct ehci_hccr *hccr;
 141         struct ehci_hcor *hcor;
 142         const struct ehci_mxs_port *port;
 143
 144         if ((index < 0) || (index >= ARRAY_SIZE(mxs_port))) {
 145                 printf("Invalid port index (index = %d)!\n", index);
 146                 return -EINVAL;
 147         }
 148
 149         port = &mxs_port[index];
 150
 151         /* Stop the USB port */
 152         usb_base = port->usb_regs + 0x100;
 153         hccr = (struct ehci_hccr *)usb_base;
 154         cap_base = ehci_readl(&hccr->cr_capbase);
 155         hcor = (struct ehci_hcor *)(usb_base + HC_LENGTH(cap_base));
 156
 157         tmp = ehci_readl(&hcor->or_usbcmd);
 158         tmp &= ~CMD_RUN;
 159         ehci_writel(tmp, &hcor->or_usbcmd);
 160
 161         /* Disable the PHY */
 162         tmp = USBPHY_PWD_RXPWDRX | USBPHY_PWD_RXPWDDIFF |
 163                 USBPHY_PWD_RXPWD1PT1 | USBPHY_PWD_RXPWDENV |
 164                 USBPHY_PWD_TXPWDV2I | USBPHY_PWD_TXPWDIBIAS |
 165                 USBPHY_PWD_TXPWDFS;
 166         writel(tmp, &port->phy_regs->hw_usbphy_pwd);
 167
 168         /* Disable USB clock */
 169         ret = ehci_mxs_toggle_clock(port, 0);
 170
 171         board_ehci_hcd_exit(index);
 172
 173         return ret;
 174 }