twl4030.c
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/*
* Copyright (c) 2009 Wind River Systems, Inc.
* Tom Rix <Tom.Rix@windriver.com>
*
* This is file is based on
* repository git.gitorious.org/u-boot-omap3/mainline.git,
* branch omap3-dev-usb, file drivers/usb/gadget/twl4030_usb.c
*
* This is the unique part of its copyright :
*
* ------------------------------------------------------------------------
*
* * (C) Copyright 2009 Atin Malaviya (atin.malaviya@gmail.com)
*
* Based on: twl4030_usb.c in linux 2.6 (drivers/i2c/chips/twl4030_usb.c)
* Copyright (C) 2004-2007 Texas Instruments
* Copyright (C) 2008 Nokia Corporation
* Contact: Felipe Balbi <felipe.balbi@nokia.com>
*
* Author: Atin Malaviya (atin.malaviya@gmail.com)
*
* ------------------------------------------------------------------------
*
* SPDX-License-Identifier: GPL-2.0+
*/
#include <twl4030.h>
/* Defines for bits in registers */
#define OPMODE_MASK (3 << 3)
#define XCVRSELECT_MASK (3 << 0)
#define CARKITMODE (1 << 2)
#define OTG_ENAB (1 << 5)
#define PHYPWD (1 << 0)
#define CLOCKGATING_EN (1 << 2)
#define CLK32K_EN (1 << 1)
#define REQ_PHY_DPLL_CLK (1 << 0)
#define PHY_DPLL_CLK (1 << 0)
static int twl4030_usb_write(u8 address, u8 data)
{
int ret;
ret = twl4030_i2c_write_u8(TWL4030_CHIP_USB, address, data);
if (ret != 0)
printf("TWL4030:USB:Write[0x%x] Error %d\n", address, ret);
return ret;
}
static int twl4030_usb_read(u8 address)
{
u8 data;
int ret;
ret = twl4030_i2c_read_u8(TWL4030_CHIP_USB, address, &data);
if (ret == 0)
ret = data;
else
printf("TWL4030:USB:Read[0x%x] Error %d\n", address, ret);
return ret;
}
static void twl4030_usb_ldo_init(void)
{
/* Enable writing to power configuration registers */
twl4030_i2c_write_u8(TWL4030_CHIP_PM_MASTER,
TWL4030_PM_MASTER_PROTECT_KEY, 0xC0);
twl4030_i2c_write_u8(TWL4030_CHIP_PM_MASTER,
TWL4030_PM_MASTER_PROTECT_KEY, 0x0C);
/* put VUSB3V1 LDO in active state */
twl4030_i2c_write_u8(TWL4030_CHIP_PM_RECEIVER,
TWL4030_PM_RECEIVER_VUSB_DEDICATED2, 0x00);
/* input to VUSB3V1 LDO is from VBAT, not VBUS */
twl4030_i2c_write_u8(TWL4030_CHIP_PM_RECEIVER,
TWL4030_PM_RECEIVER_VUSB_DEDICATED1, 0x14);
/* turn on 3.1V regulator */
twl4030_i2c_write_u8(TWL4030_CHIP_PM_RECEIVER,
TWL4030_PM_RECEIVER_VUSB3V1_DEV_GRP, 0x20);
twl4030_i2c_write_u8(TWL4030_CHIP_PM_RECEIVER,
TWL4030_PM_RECEIVER_VUSB3V1_TYPE, 0x00);
/* turn on 1.5V regulator */
twl4030_i2c_write_u8(TWL4030_CHIP_PM_RECEIVER,
TWL4030_PM_RECEIVER_VUSB1V5_DEV_GRP, 0x20);
twl4030_i2c_write_u8(TWL4030_CHIP_PM_RECEIVER,
TWL4030_PM_RECEIVER_VUSB1V5_TYPE, 0x00);
/* turn on 1.8V regulator */
twl4030_i2c_write_u8(TWL4030_CHIP_PM_RECEIVER,
TWL4030_PM_RECEIVER_VUSB1V8_DEV_GRP, 0x20);
twl4030_i2c_write_u8(TWL4030_CHIP_PM_RECEIVER,
TWL4030_PM_RECEIVER_VUSB1V8_TYPE, 0x00);
/* disable access to power configuration registers */
twl4030_i2c_write_u8(TWL4030_CHIP_PM_MASTER,
TWL4030_PM_MASTER_PROTECT_KEY, 0x00);
}
static void twl4030_phy_power(void)
{
u8 pwr, clk;
/* Power the PHY */
pwr = twl4030_usb_read(TWL4030_USB_PHY_PWR_CTRL);
pwr &= ~PHYPWD;
twl4030_usb_write(TWL4030_USB_PHY_PWR_CTRL, pwr);
/* Enable clocks */
clk = twl4030_usb_read(TWL4030_USB_PHY_CLK_CTRL);
clk |= CLOCKGATING_EN | CLK32K_EN;
twl4030_usb_write(TWL4030_USB_PHY_CLK_CTRL, clk);
}
/*
* Initiaze the ULPI interface
* ULPI : Universal Transceiver Macrocell Low Pin Interface
* An interface between the USB link controller like musb and the
* the PHY or transceiver that drives the actual bus.
*/
int twl4030_usb_ulpi_init(void)
{
long timeout = 1000 * 1000; /* 1 sec */;
u8 clk, sts, pwr;
/* twl4030 ldo init */
twl4030_usb_ldo_init();
/* Enable the twl4030 phy */
twl4030_phy_power();
/* Enable DPLL to access PHY registers over I2C */
clk = twl4030_usb_read(TWL4030_USB_PHY_CLK_CTRL);
clk |= REQ_PHY_DPLL_CLK;
twl4030_usb_write(TWL4030_USB_PHY_CLK_CTRL, clk);
/* Check if the PHY DPLL is locked */
sts = twl4030_usb_read(TWL4030_USB_PHY_CLK_CTRL_STS);
while (!(sts & PHY_DPLL_CLK) && 0 < timeout) {
udelay(10);
sts = twl4030_usb_read(TWL4030_USB_PHY_CLK_CTRL_STS);
timeout -= 10;
}
/* Final check */
sts = twl4030_usb_read(TWL4030_USB_PHY_CLK_CTRL_STS);
if (!(sts & PHY_DPLL_CLK)) {
printf("Error:TWL4030:USB Timeout setting PHY DPLL clock\n");
return -1;
}
/*
* There are two circuit blocks attached to the PHY,
* Carkit and USB OTG. Disable Carkit and enable USB OTG
*/
twl4030_usb_write(TWL4030_USB_IFC_CTRL_CLR, CARKITMODE);
pwr = twl4030_usb_read(TWL4030_USB_POWER_CTRL);
pwr |= OTG_ENAB;
twl4030_usb_write(TWL4030_USB_POWER_CTRL_SET, pwr);
/* Clear the opmode bits to ensure normal encode */
twl4030_usb_write(TWL4030_USB_FUNC_CTRL_CLR, OPMODE_MASK);
/* Clear the xcvrselect bits to enable the high speed transeiver */
twl4030_usb_write(TWL4030_USB_FUNC_CTRL_CLR, XCVRSELECT_MASK);
/* Let ULPI control the DPLL clock */
clk = twl4030_usb_read(TWL4030_USB_PHY_CLK_CTRL);
clk &= ~REQ_PHY_DPLL_CLK;
twl4030_usb_write(TWL4030_USB_PHY_CLK_CTRL, clk);
return 0;
}