drivers/usb/phy/twl4030.c

   1 /*
   2  * Copyright (c) 2009 Wind River Systems, Inc.
   3  * Tom Rix <Tom.Rix@windriver.com>
   4  *
   5  * This is file is based on
   6  * repository git.gitorious.org/u-boot-omap3/mainline.git,
   7  * branch omap3-dev-usb, file drivers/usb/gadget/twl4030_usb.c
   8  *
   9  * This is the unique part of its copyright :
  10  *
  11  * ------------------------------------------------------------------------
  12  *
  13  *  * (C) Copyright 2009 Atin Malaviya (atin.malaviya@gmail.com)
  14  *
  15  * Based on: twl4030_usb.c in linux 2.6 (drivers/i2c/chips/twl4030_usb.c)
  16  * Copyright (C) 2004-2007 Texas Instruments
  17  * Copyright (C) 2008 Nokia Corporation
  18  * Contact: Felipe Balbi <felipe.balbi@nokia.com>
  19  *
  20  * Author: Atin Malaviya (atin.malaviya@gmail.com)
  21  *
  22  * ------------------------------------------------------------------------
  23  *
  24  * SPDX-License-Identifier:     GPL-2.0+
  25  */
  26
  27 #include <twl4030.h>
  28
  29 /* Defines for bits in registers */
  30 #define OPMODE_MASK             (3 << 3)
  31 #define XCVRSELECT_MASK         (3 << 0)
  32 #define CARKITMODE              (1 << 2)
  33 #define OTG_ENAB                (1 << 5)
  34 #define PHYPWD                  (1 << 0)
  35 #define CLOCKGATING_EN          (1 << 2)
  36 #define CLK32K_EN               (1 << 1)
  37 #define REQ_PHY_DPLL_CLK        (1 << 0)
  38 #define PHY_DPLL_CLK            (1 << 0)
  39
  40 static int twl4030_usb_write(u8 address, u8 data)
  41 {
  42         int ret;
  43
  44         ret = twl4030_i2c_write_u8(TWL4030_CHIP_USB, address, data);
  45         if (ret != 0)
  46                 printf("TWL4030:USB:Write[0x%x] Error %d\n", address, ret);
  47
  48         return ret;
  49 }
  50
  51 static int twl4030_usb_read(u8 address)
  52 {
  53         u8 data;
  54         int ret;
  55
  56         ret = twl4030_i2c_read_u8(TWL4030_CHIP_USB, address, &data);
  57         if (ret == 0)
  58                 ret = data;
  59         else
  60                 printf("TWL4030:USB:Read[0x%x] Error %d\n", address, ret);
  61
  62         return ret;
  63 }
  64
  65 static void twl4030_usb_ldo_init(void)
  66 {
  67         /* Enable writing to power configuration registers */
  68         twl4030_i2c_write_u8(TWL4030_CHIP_PM_MASTER,
  69                              TWL4030_PM_MASTER_PROTECT_KEY, 0xC0);
  70         twl4030_i2c_write_u8(TWL4030_CHIP_PM_MASTER,
  71                              TWL4030_PM_MASTER_PROTECT_KEY, 0x0C);
  72
  73         /* put VUSB3V1 LDO in active state */
  74         twl4030_i2c_write_u8(TWL4030_CHIP_PM_RECEIVER,
  75                              TWL4030_PM_RECEIVER_VUSB_DEDICATED2, 0x00);
  76
  77         /* input to VUSB3V1 LDO is from VBAT, not VBUS */
  78         twl4030_i2c_write_u8(TWL4030_CHIP_PM_RECEIVER,
  79                              TWL4030_PM_RECEIVER_VUSB_DEDICATED1, 0x14);
  80
  81         /* turn on 3.1V regulator */
  82         twl4030_i2c_write_u8(TWL4030_CHIP_PM_RECEIVER,
  83                              TWL4030_PM_RECEIVER_VUSB3V1_DEV_GRP, 0x20);
  84         twl4030_i2c_write_u8(TWL4030_CHIP_PM_RECEIVER,
  85                              TWL4030_PM_RECEIVER_VUSB3V1_TYPE, 0x00);
  86
  87         /* turn on 1.5V regulator */
  88         twl4030_i2c_write_u8(TWL4030_CHIP_PM_RECEIVER,
  89                              TWL4030_PM_RECEIVER_VUSB1V5_DEV_GRP, 0x20);
  90         twl4030_i2c_write_u8(TWL4030_CHIP_PM_RECEIVER,
  91                              TWL4030_PM_RECEIVER_VUSB1V5_TYPE, 0x00);
  92
  93         /* turn on 1.8V regulator */
  94         twl4030_i2c_write_u8(TWL4030_CHIP_PM_RECEIVER,
  95                              TWL4030_PM_RECEIVER_VUSB1V8_DEV_GRP, 0x20);
  96         twl4030_i2c_write_u8(TWL4030_CHIP_PM_RECEIVER,
  97                              TWL4030_PM_RECEIVER_VUSB1V8_TYPE, 0x00);
  98
  99         /* disable access to power configuration registers */
 100         twl4030_i2c_write_u8(TWL4030_CHIP_PM_MASTER,
 101                              TWL4030_PM_MASTER_PROTECT_KEY, 0x00);
 102 }
 103
 104 static void twl4030_phy_power(void)
 105 {
 106         u8 pwr, clk;
 107
 108         /* Power the PHY */
 109         pwr = twl4030_usb_read(TWL4030_USB_PHY_PWR_CTRL);
 110         pwr &= ~PHYPWD;
 111         twl4030_usb_write(TWL4030_USB_PHY_PWR_CTRL, pwr);
 112         /* Enable clocks */
 113         clk = twl4030_usb_read(TWL4030_USB_PHY_CLK_CTRL);
 114         clk |= CLOCKGATING_EN | CLK32K_EN;
 115         twl4030_usb_write(TWL4030_USB_PHY_CLK_CTRL, clk);
 116 }
 117
 118 /*
 119  * Initiaze the ULPI interface
 120  * ULPI : Universal Transceiver Macrocell Low Pin Interface
 121  * An interface between the USB link controller like musb and the
 122  * the PHY or transceiver that drives the actual bus.
 123  */
 124 int twl4030_usb_ulpi_init(void)
 125 {
 126         long timeout = 1000 * 1000; /* 1 sec */;
 127         u8 clk, sts, pwr;
 128
 129         /* twl4030 ldo init */
 130         twl4030_usb_ldo_init();
 131
 132         /* Enable the twl4030 phy */
 133         twl4030_phy_power();
 134
 135         /* Enable DPLL to access PHY registers over I2C */
 136         clk = twl4030_usb_read(TWL4030_USB_PHY_CLK_CTRL);
 137         clk |= REQ_PHY_DPLL_CLK;
 138         twl4030_usb_write(TWL4030_USB_PHY_CLK_CTRL, clk);
 139
 140         /* Check if the PHY DPLL is locked */
 141         sts = twl4030_usb_read(TWL4030_USB_PHY_CLK_CTRL_STS);
 142         while (!(sts & PHY_DPLL_CLK) && 0 < timeout) {
 143                 udelay(10);
 144                 sts = twl4030_usb_read(TWL4030_USB_PHY_CLK_CTRL_STS);
 145                 timeout -= 10;
 146         }
 147
 148         /* Final check */
 149         sts = twl4030_usb_read(TWL4030_USB_PHY_CLK_CTRL_STS);
 150         if (!(sts & PHY_DPLL_CLK)) {
 151                 printf("Error:TWL4030:USB Timeout setting PHY DPLL clock\n");
 152                 return -1;
 153         }
 154
 155         /*
 156          * There are two circuit blocks attached to the PHY,
 157          * Carkit and USB OTG.  Disable Carkit and enable USB OTG
 158          */
 159         twl4030_usb_write(TWL4030_USB_IFC_CTRL_CLR, CARKITMODE);
 160         pwr = twl4030_usb_read(TWL4030_USB_POWER_CTRL);
 161         pwr |= OTG_ENAB;
 162         twl4030_usb_write(TWL4030_USB_POWER_CTRL_SET, pwr);
 163
 164         /* Clear the opmode bits to ensure normal encode */
 165         twl4030_usb_write(TWL4030_USB_FUNC_CTRL_CLR, OPMODE_MASK);
 166
 167         /* Clear the xcvrselect bits to enable the high speed transeiver */
 168         twl4030_usb_write(TWL4030_USB_FUNC_CTRL_CLR, XCVRSELECT_MASK);
 169
 170         /* Let ULPI control the DPLL clock */
 171         clk = twl4030_usb_read(TWL4030_USB_PHY_CLK_CTRL);
 172         clk &= ~REQ_PHY_DPLL_CLK;
 173         twl4030_usb_write(TWL4030_USB_PHY_CLK_CTRL, clk);
 174
 175         return 0;
 176 }