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  * This program is free software; you can redistribute it and/or modify
  25  * it under the terms of the GNU General Public License as published by
  26  * the Free Software Foundation; either version 2 of the License, or
  27  * (at your option) any later version.
  28  *
  29  * This program is distributed in the hope that it will be useful,
  30  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  31  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  32  * GNU General Public License for more details.
  33  *
  34  * You should have received a copy of the GNU General Public License
  35  * along with this program; if not, write to the Free Software
  36  * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
  37  * MA 02111-1307 USA
  38  */
  39
  40 #include <twl4030.h>
  41
  42 /* Defines for bits in registers */
  43 #define OPMODE_MASK             (3 << 3)
  44 #define XCVRSELECT_MASK         (3 << 0)
  45 #define CARKITMODE              (1 << 2)
  46 #define OTG_ENAB                (1 << 5)
  47 #define PHYPWD                  (1 << 0)
  48 #define CLOCKGATING_EN          (1 << 2)
  49 #define CLK32K_EN               (1 << 1)
  50 #define REQ_PHY_DPLL_CLK        (1 << 0)
  51 #define PHY_DPLL_CLK            (1 << 0)
  52
  53 static int twl4030_usb_write(u8 address, u8 data)
  54 {
  55         int ret;
  56
  57         ret = twl4030_i2c_write_u8(TWL4030_CHIP_USB, address, data);
  58         if (ret != 0)
  59                 printf("TWL4030:USB:Write[0x%x] Error %d\n", address, ret);
  60
  61         return ret;
  62 }
  63
  64 static int twl4030_usb_read(u8 address)
  65 {
  66         u8 data;
  67         int ret;
  68
  69         ret = twl4030_i2c_read_u8(TWL4030_CHIP_USB, address, &data);
  70         if (ret == 0)
  71                 ret = data;
  72         else
  73                 printf("TWL4030:USB:Read[0x%x] Error %d\n", address, ret);
  74
  75         return ret;
  76 }
  77
  78 static void twl4030_usb_ldo_init(void)
  79 {
  80         /* Enable writing to power configuration registers */
  81         twl4030_i2c_write_u8(TWL4030_CHIP_PM_MASTER,
  82                              TWL4030_PM_MASTER_PROTECT_KEY, 0xC0);
  83         twl4030_i2c_write_u8(TWL4030_CHIP_PM_MASTER,
  84                              TWL4030_PM_MASTER_PROTECT_KEY, 0x0C);
  85
  86         /* put VUSB3V1 LDO in active state */
  87         twl4030_i2c_write_u8(TWL4030_CHIP_PM_RECEIVER,
  88                              TWL4030_PM_RECEIVER_VUSB_DEDICATED2, 0x00);
  89
  90         /* input to VUSB3V1 LDO is from VBAT, not VBUS */
  91         twl4030_i2c_write_u8(TWL4030_CHIP_PM_RECEIVER,
  92                              TWL4030_PM_RECEIVER_VUSB_DEDICATED1, 0x14);
  93
  94         /* turn on 3.1V regulator */
  95         twl4030_i2c_write_u8(TWL4030_CHIP_PM_RECEIVER,
  96                              TWL4030_PM_RECEIVER_VUSB3V1_DEV_GRP, 0x20);
  97         twl4030_i2c_write_u8(TWL4030_CHIP_PM_RECEIVER,
  98                              TWL4030_PM_RECEIVER_VUSB3V1_TYPE, 0x00);
  99
 100         /* turn on 1.5V regulator */
 101         twl4030_i2c_write_u8(TWL4030_CHIP_PM_RECEIVER,
 102                              TWL4030_PM_RECEIVER_VUSB1V5_DEV_GRP, 0x20);
 103         twl4030_i2c_write_u8(TWL4030_CHIP_PM_RECEIVER,
 104                              TWL4030_PM_RECEIVER_VUSB1V5_TYPE, 0x00);
 105
 106         /* turn on 1.8V regulator */
 107         twl4030_i2c_write_u8(TWL4030_CHIP_PM_RECEIVER,
 108                              TWL4030_PM_RECEIVER_VUSB1V8_DEV_GRP, 0x20);
 109         twl4030_i2c_write_u8(TWL4030_CHIP_PM_RECEIVER,
 110                              TWL4030_PM_RECEIVER_VUSB1V8_TYPE, 0x00);
 111
 112         /* disable access to power configuration registers */
 113         twl4030_i2c_write_u8(TWL4030_CHIP_PM_MASTER,
 114                              TWL4030_PM_MASTER_PROTECT_KEY, 0x00);
 115 }
 116
 117 static void twl4030_phy_power(void)
 118 {
 119         u8 pwr, clk;
 120
 121         /* Power the PHY */
 122         pwr = twl4030_usb_read(TWL4030_USB_PHY_PWR_CTRL);
 123         pwr &= ~PHYPWD;
 124         twl4030_usb_write(TWL4030_USB_PHY_PWR_CTRL, pwr);
 125         /* Enable clocks */
 126         clk = twl4030_usb_read(TWL4030_USB_PHY_CLK_CTRL);
 127         clk |= CLOCKGATING_EN | CLK32K_EN;
 128         twl4030_usb_write(TWL4030_USB_PHY_CLK_CTRL, clk);
 129 }
 130
 131 /*
 132  * Initiaze the ULPI interface
 133  * ULPI : Universal Transceiver Macrocell Low Pin Interface
 134  * An interface between the USB link controller like musb and the
 135  * the PHY or transceiver that drives the actual bus.
 136  */
 137 int twl4030_usb_ulpi_init(void)
 138 {
 139         long timeout = 1000 * 1000; /* 1 sec */;
 140         u8 clk, sts, pwr;
 141
 142         /* twl4030 ldo init */
 143         twl4030_usb_ldo_init();
 144
 145         /* Enable the twl4030 phy */
 146         twl4030_phy_power();
 147
 148         /* Enable DPLL to access PHY registers over I2C */
 149         clk = twl4030_usb_read(TWL4030_USB_PHY_CLK_CTRL);
 150         clk |= REQ_PHY_DPLL_CLK;
 151         twl4030_usb_write(TWL4030_USB_PHY_CLK_CTRL, clk);
 152
 153         /* Check if the PHY DPLL is locked */
 154         sts = twl4030_usb_read(TWL4030_USB_PHY_CLK_CTRL_STS);
 155         while (!(sts & PHY_DPLL_CLK) && 0 < timeout) {
 156                 udelay(10);
 157                 sts = twl4030_usb_read(TWL4030_USB_PHY_CLK_CTRL_STS);
 158                 timeout -= 10;
 159         }
 160
 161         /* Final check */
 162         sts = twl4030_usb_read(TWL4030_USB_PHY_CLK_CTRL_STS);
 163         if (!(sts & PHY_DPLL_CLK)) {
 164                 printf("Error:TWL4030:USB Timeout setting PHY DPLL clock\n");
 165                 return -1;
 166         }
 167
 168         /*
 169          * There are two circuit blocks attached to the PHY,
 170          * Carkit and USB OTG.  Disable Carkit and enable USB OTG
 171          */
 172         twl4030_usb_write(TWL4030_USB_IFC_CTRL_CLR, CARKITMODE);
 173         pwr = twl4030_usb_read(TWL4030_USB_POWER_CTRL);
 174         pwr |= OTG_ENAB;
 175         twl4030_usb_write(TWL4030_USB_POWER_CTRL_SET, pwr);
 176
 177         /* Clear the opmode bits to ensure normal encode */
 178         twl4030_usb_write(TWL4030_USB_FUNC_CTRL_CLR, OPMODE_MASK);
 179
 180         /* Clear the xcvrselect bits to enable the high speed transeiver */
 181         twl4030_usb_write(TWL4030_USB_FUNC_CTRL_CLR, XCVRSELECT_MASK);
 182
 183         /* Let ULPI control the DPLL clock */
 184         clk = twl4030_usb_read(TWL4030_USB_PHY_CLK_CTRL);
 185         clk &= ~REQ_PHY_DPLL_CLK;
 186         twl4030_usb_write(TWL4030_USB_PHY_CLK_CTRL, clk);
 187
 188         return 0;
 189 }