196 lines
6.0 KiB
C
196 lines
6.0 KiB
C
/*
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* Copyright (c) 2009 Wind River Systems, Inc.
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* Tom Rix <Tom.Rix@windriver.com>
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*
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* This is file is based on
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* repository git.gitorious.org/u-boot-omap3/mainline.git,
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* branch omap3-dev-usb, file drivers/usb/gadget/twl4030_usb.c
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*
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* This is the unique part of its copyright :
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*
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* ------------------------------------------------------------------------
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*
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* * (C) Copyright 2009 Atin Malaviya (atin.malaviya@gmail.com)
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*
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* Based on: twl4030_usb.c in linux 2.6 (drivers/i2c/chips/twl4030_usb.c)
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* Copyright (C) 2004-2007 Texas Instruments
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* Copyright (C) 2008 Nokia Corporation
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* Contact: Felipe Balbi <felipe.balbi@nokia.com>
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*
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* Author: Atin Malaviya (atin.malaviya@gmail.com)
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*
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* ------------------------------------------------------------------------
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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*/
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#include <mfd/twl4030.h>
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#include <usb/twl4030.h>
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#include <clock.h>
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static int twl4030_usb_write(u8 address, u8 data)
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{
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int ret;
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struct twl4030 *twl4030 = twl4030_get();
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ret = twl4030_reg_write(twl4030, address, data);
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if (ret != 0)
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printf("TWL4030:USB:Write[0x%x] Error %d\n", address, ret);
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return ret;
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}
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static int twl4030_usb_read(u8 address)
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{
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u8 data;
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int ret;
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struct twl4030 *twl4030 = twl4030_get();
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ret = twl4030_reg_read(twl4030, address, &data);
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if (ret == 0)
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ret = data;
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else
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printf("TWL4030:USB:Read[0x%x] Error %d\n", address, ret);
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return ret;
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}
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void twl4030_power_init(void)
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{
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unsigned char byte;
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struct twl4030 *twl4030 = twl4030_get();
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/* set VAUX3 to 2.8V */
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byte = TWL4030_PM_RECEIVER_DEV_GRP_P1;
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twl4030_reg_write(twl4030, TWL4030_PM_RECEIVER_VAUX3_DEV_GRP, byte);
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byte = TWL4030_PM_RECEIVER_VAUX3_VSEL_28;
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twl4030_reg_write(twl4030, TWL4030_PM_RECEIVER_VAUX3_DEDICATED, byte);
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/* set VPLL2 to 1.8V */
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byte = TWL4030_PM_RECEIVER_DEV_GRP_ALL;
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twl4030_reg_write(twl4030, TWL4030_PM_RECEIVER_VPLL2_DEV_GRP, byte);
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byte = TWL4030_PM_RECEIVER_VPLL2_VSEL_18;
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twl4030_reg_write(twl4030, TWL4030_PM_RECEIVER_VPLL2_DEDICATED, byte);
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/* set VDAC to 1.8V */
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byte = TWL4030_PM_RECEIVER_DEV_GRP_P1;
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twl4030_reg_write(twl4030, TWL4030_PM_RECEIVER_VDAC_DEV_GRP, byte);
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byte = TWL4030_PM_RECEIVER_VDAC_VSEL_18;
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twl4030_reg_write(twl4030, TWL4030_PM_RECEIVER_VDAC_DEDICATED, byte);
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}
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static void twl4030_usb_ldo_init(void)
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{
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struct twl4030 *twl4030 = twl4030_get();
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/* Enable writing to power configuration registers */
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twl4030_reg_write(twl4030, TWL4030_PM_MASTER_PROTECT_KEY, 0xC0);
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twl4030_reg_write(twl4030, TWL4030_PM_MASTER_PROTECT_KEY, 0x0C);
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/* put VUSB3V1 LDO in active state */
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twl4030_reg_write(twl4030, TWL4030_PM_RECEIVER_VUSB_DEDICATED2, 0x00);
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/* input to VUSB3V1 LDO is from VBAT, not VBUS */
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twl4030_reg_write(twl4030, TWL4030_PM_RECEIVER_VUSB_DEDICATED1, 0x14);
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/* turn on 3.1V regulator */
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twl4030_reg_write(twl4030, TWL4030_PM_RECEIVER_VUSB3V1_DEV_GRP, 0x20);
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twl4030_reg_write(twl4030, TWL4030_PM_RECEIVER_VUSB3V1_TYPE, 0x00);
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/* turn on 1.5V regulator */
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twl4030_reg_write(twl4030, TWL4030_PM_RECEIVER_VUSB1V5_DEV_GRP, 0x20);
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twl4030_reg_write(twl4030, TWL4030_PM_RECEIVER_VUSB1V5_TYPE, 0x00);
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/* turn on 1.8V regulator */
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twl4030_reg_write(twl4030, TWL4030_PM_RECEIVER_VUSB1V8_DEV_GRP, 0x20);
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twl4030_reg_write(twl4030, TWL4030_PM_RECEIVER_VUSB1V8_TYPE, 0x00);
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/* disable access to power configuration registers */
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twl4030_reg_write(twl4030, TWL4030_PM_MASTER_PROTECT_KEY, 0x0);
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/* FIXME *need to enable LED to get USB power? */
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twl4030_reg_write(twl4030, TWL4030_BASEADD_LED, 0x33);
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}
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static void twl4030_phy_power(void)
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{
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u8 pwr, clk;
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/* Power the PHY */
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pwr = twl4030_usb_read(TWL4030_USB_PHY_PWR_CTRL);
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pwr &= ~PHYPWD;
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twl4030_usb_write(TWL4030_USB_PHY_PWR_CTRL, pwr);
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/* Enable clocks */
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clk = twl4030_usb_read(TWL4030_USB_PHY_CLK_CTRL);
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clk |= CLOCKGATING_EN | CLK32K_EN;
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twl4030_usb_write(TWL4030_USB_PHY_CLK_CTRL, clk);
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}
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/*
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* Initiaze the ULPI interface
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* ULPI : Universal Transceiver Macrocell Low Pin Interface
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* An interface between the USB link controller like musb and the
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* the PHY or transceiver that drives the actual bus.
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*/
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int twl4030_usb_ulpi_init(void)
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{
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u8 clk, sts, pwr;
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uint64_t start;
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long timeout = 1000 * 1000; /* 1 sec */;
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/* power up the twl4030 */
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twl4030_power_init();
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/* twl4030 ldo init */
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twl4030_usb_ldo_init();
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/* Enable the twl4030 phy */
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twl4030_phy_power();
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/* Enable DPLL to access PHY registers over I2C */
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clk = twl4030_usb_read(TWL4030_USB_PHY_CLK_CTRL);
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clk |= REQ_PHY_DPLL_CLK;
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twl4030_usb_write(TWL4030_USB_PHY_CLK_CTRL, clk);
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/* Check if the PHY DPLL is locked */
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sts = twl4030_usb_read(TWL4030_USB_PHY_CLK_CTRL_STS);
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start = get_time_ns();
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while (!(sts & PHY_DPLL_CLK)) {
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udelay(10);
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sts = twl4030_usb_read(TWL4030_USB_PHY_CLK_CTRL_STS);
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printf("Error:TWL4030:USB Timeout setting PHY DPLL clock\n");
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if (is_timeout(start, timeout * USECOND)) {
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return -ETIMEDOUT;
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}
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}
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/*
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* There are two circuit blocks attached to the PHY,
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* Carkit and USB OTG. Disable Carkit and enable USB OTG
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*/
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twl4030_usb_write(TWL4030_USB_IFC_CTRL_CLR, CARKITMODE);
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pwr = twl4030_usb_read(TWL4030_USB_POWER_CTRL);
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pwr |= OTG_ENAB;
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twl4030_usb_write(TWL4030_USB_POWER_CTRL_SET, pwr);
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/* Clear the opmode bits to ensure normal encode */
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twl4030_usb_write(TWL4030_USB_FUNC_CTRL_CLR, OPMODE_MASK);
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/* Clear the xcvrselect bits to enable the high speed transeiver */
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twl4030_usb_write(TWL4030_USB_FUNC_CTRL_CLR, XCVRSELECT_MASK);
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/* Let ULPI control the DPLL clock */
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clk = twl4030_usb_read(TWL4030_USB_PHY_CLK_CTRL);
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clk &= ~REQ_PHY_DPLL_CLK;
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twl4030_usb_write(TWL4030_USB_PHY_CLK_CTRL, clk);
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return 0;
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}
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