/* * 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; }