/* * Copyright (c) 2009 Wind River Systems, Inc. * Tom Rix * * 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 * * Author: Atin Malaviya (atin.malaviya@gmail.com) * * ------------------------------------------------------------------------ * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License as published by * the Free Software Foundation; either version 2 of the License, or * (at your option) any later version. * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. * */ #include #include #include static int twl4030_usb_write(u8 address, u8 data) { int ret; struct twl4030 *twl4030 = twl4030_get(); ret = twl4030_reg_write(twl4030, 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; struct twl4030 *twl4030 = twl4030_get(); ret = twl4030_reg_read(twl4030, address, &data); if (ret == 0) ret = data; else printf("TWL4030:USB:Read[0x%x] Error %d\n", address, ret); return ret; } void twl4030_power_init(void) { unsigned char byte; struct twl4030 *twl4030 = twl4030_get(); /* set VAUX3 to 2.8V */ byte = TWL4030_PM_RECEIVER_DEV_GRP_P1; twl4030_reg_write(twl4030, TWL4030_PM_RECEIVER_VAUX3_DEV_GRP, byte); byte = TWL4030_PM_RECEIVER_VAUX3_VSEL_28; twl4030_reg_write(twl4030, TWL4030_PM_RECEIVER_VAUX3_DEDICATED, byte); /* set VPLL2 to 1.8V */ byte = TWL4030_PM_RECEIVER_DEV_GRP_ALL; twl4030_reg_write(twl4030, TWL4030_PM_RECEIVER_VPLL2_DEV_GRP, byte); byte = TWL4030_PM_RECEIVER_VPLL2_VSEL_18; twl4030_reg_write(twl4030, TWL4030_PM_RECEIVER_VPLL2_DEDICATED, byte); /* set VDAC to 1.8V */ byte = TWL4030_PM_RECEIVER_DEV_GRP_P1; twl4030_reg_write(twl4030, TWL4030_PM_RECEIVER_VDAC_DEV_GRP, byte); byte = TWL4030_PM_RECEIVER_VDAC_VSEL_18; twl4030_reg_write(twl4030, TWL4030_PM_RECEIVER_VDAC_DEDICATED, byte); } static void twl4030_usb_ldo_init(void) { struct twl4030 *twl4030 = twl4030_get(); /* Enable writing to power configuration registers */ twl4030_reg_write(twl4030, TWL4030_PM_MASTER_PROTECT_KEY, 0xC0); twl4030_reg_write(twl4030, TWL4030_PM_MASTER_PROTECT_KEY, 0x0C); /* put VUSB3V1 LDO in active state */ twl4030_reg_write(twl4030, TWL4030_PM_RECEIVER_VUSB_DEDICATED2, 0x00); /* input to VUSB3V1 LDO is from VBAT, not VBUS */ twl4030_reg_write(twl4030, TWL4030_PM_RECEIVER_VUSB_DEDICATED1, 0x14); /* turn on 3.1V regulator */ twl4030_reg_write(twl4030, TWL4030_PM_RECEIVER_VUSB3V1_DEV_GRP, 0x20); twl4030_reg_write(twl4030, TWL4030_PM_RECEIVER_VUSB3V1_TYPE, 0x00); /* turn on 1.5V regulator */ twl4030_reg_write(twl4030, TWL4030_PM_RECEIVER_VUSB1V5_DEV_GRP, 0x20); twl4030_reg_write(twl4030, TWL4030_PM_RECEIVER_VUSB1V5_TYPE, 0x00); /* turn on 1.8V regulator */ twl4030_reg_write(twl4030, TWL4030_PM_RECEIVER_VUSB1V8_DEV_GRP, 0x20); twl4030_reg_write(twl4030, TWL4030_PM_RECEIVER_VUSB1V8_TYPE, 0x00); /* disable access to power configuration registers */ twl4030_reg_write(twl4030, TWL4030_PM_MASTER_PROTECT_KEY, 0x0); /* FIXME *need to enable LED to get USB power? */ twl4030_reg_write(twl4030, TWL4030_BASEADD_LED, 0x33); } 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) { u8 clk, sts, pwr; uint64_t start; long timeout = 1000 * 1000; /* 1 sec */; /* power up the twl4030 */ twl4030_power_init(); /* 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); start = get_time_ns(); while (!(sts & PHY_DPLL_CLK)) { udelay(10); sts = twl4030_usb_read(TWL4030_USB_PHY_CLK_CTRL_STS); printf("Error:TWL4030:USB Timeout setting PHY DPLL clock\n"); if (is_timeout(start, timeout * USECOND)) { return -ETIMEDOUT; } } /* * 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; }