mirror of
https://github.com/AsahiLinux/u-boot
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a94a4071d4
Replace instances of http://www.ti.com with https://www.ti.com Signed-off-by: Nishanth Menon <nm@ti.com>
145 lines
4.1 KiB
C
145 lines
4.1 KiB
C
/*
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* Voltage Controller implementation for OMAP
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*
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* Copyright (C) 2012 Texas Instruments Incorporated - https://www.ti.com/
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* Nishanth Menon
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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 version 2 as
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* published by the Free Software Foundation.
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*
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* This program is distributed "as is" WITHOUT ANY WARRANTY of any
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* kind, whether express or implied; without even the implied warranty
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* of 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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#include <common.h>
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#include <asm/omap_common.h>
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#include <asm/arch/sys_proto.h>
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#include <asm/arch/clock.h>
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/* Register defines and masks for VC IP Block */
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/* PRM_VC_CFG_I2C_MODE */
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#define PRM_VC_CFG_I2C_MODE_DFILTEREN_BIT (0x1 << 6)
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#define PRM_VC_CFG_I2C_MODE_SRMODEEN_BIT (0x1 << 4)
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#define PRM_VC_CFG_I2C_MODE_HSMODEEN_BIT (0x1 << 3)
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#define PRM_VC_CFG_I2C_MODE_HSMCODE_SHIFT 0x0
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#define PRM_VC_CFG_I2C_MODE_HSMCODE_MASK 0x3
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/* PRM_VC_CFG_I2C_CLK */
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#define PRM_VC_CFG_I2C_CLK_HSCLL_SHIFT 24
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#define PRM_VC_CFG_I2C_CLK_HSCLL_MASK 0xFF
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#define PRM_VC_CFG_I2C_CLK_HSCLH_SHIFT 16
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#define PRM_VC_CFG_I2C_CLK_HSCLH_MASK 0xFF
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#define PRM_VC_CFG_I2C_CLK_SCLH_SHIFT 0
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#define PRM_VC_CFG_I2C_CLK_SCLH_MASK 0xFF
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#define PRM_VC_CFG_I2C_CLK_SCLL_SHIFT 8
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#define PRM_VC_CFG_I2C_CLK_SCLL_MASK (0xFF << 8)
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/* PRM_VC_VAL_BYPASS */
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#define PRM_VC_VAL_BYPASS_VALID_BIT (0x1 << 24)
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#define PRM_VC_VAL_BYPASS_SLAVEADDR_SHIFT 0
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#define PRM_VC_VAL_BYPASS_SLAVEADDR_MASK 0x7F
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#define PRM_VC_VAL_BYPASS_REGADDR_SHIFT 8
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#define PRM_VC_VAL_BYPASS_REGADDR_MASK 0xFF
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#define PRM_VC_VAL_BYPASS_DATA_SHIFT 16
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#define PRM_VC_VAL_BYPASS_DATA_MASK 0xFF
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/**
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* omap_vc_init() - Initialization for Voltage controller
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* @speed_khz: I2C buspeed in KHz
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*/
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static void omap_vc_init(u16 speed_khz)
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{
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u32 val;
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u32 sys_clk_khz, cycles_hi, cycles_low;
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sys_clk_khz = get_sys_clk_freq() / 1000;
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if (speed_khz > 400) {
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puts("higher speed requested - throttle to 400Khz\n");
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speed_khz = 400;
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}
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/*
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* Setup the dedicated I2C controller for Voltage Control
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* I2C clk - high period 40% low period 60%
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*/
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speed_khz /= 10;
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cycles_hi = sys_clk_khz * 4 / speed_khz;
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cycles_low = sys_clk_khz * 6 / speed_khz;
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/* values to be set in register - less by 5 & 7 respectively */
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cycles_hi -= 5;
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cycles_low -= 7;
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val = (cycles_hi << PRM_VC_CFG_I2C_CLK_SCLH_SHIFT) |
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(cycles_low << PRM_VC_CFG_I2C_CLK_SCLL_SHIFT);
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writel(val, (*prcm)->prm_vc_cfg_i2c_clk);
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/*
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* Master code if there are multiple masters on the I2C_SR bus.
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*/
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val = 0x0 << PRM_VC_CFG_I2C_MODE_HSMCODE_SHIFT;
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/* No HS mode for now */
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val &= ~PRM_VC_CFG_I2C_MODE_HSMODEEN_BIT;
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writel(val, (*prcm)->prm_vc_cfg_i2c_mode);
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}
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/**
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* omap_vc_bypass_send_value() - Send a data using VC Bypass command
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* @sa: 7 bit I2C slave address of the PMIC
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* @reg_addr: I2C register address(8 bit) address in PMIC
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* @reg_data: what 8 bit data to write
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*/
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int omap_vc_bypass_send_value(u8 sa, u8 reg_addr, u8 reg_data)
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{
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/*
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* Unfortunately we need to loop here instead of a defined time
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* use arbitary large value
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*/
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u32 timeout = 0xFFFF;
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u32 reg_val;
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sa &= PRM_VC_VAL_BYPASS_SLAVEADDR_MASK;
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reg_addr &= PRM_VC_VAL_BYPASS_REGADDR_MASK;
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reg_data &= PRM_VC_VAL_BYPASS_DATA_MASK;
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/* program VC to send data */
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reg_val = sa << PRM_VC_VAL_BYPASS_SLAVEADDR_SHIFT |
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reg_addr << PRM_VC_VAL_BYPASS_REGADDR_SHIFT |
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reg_data << PRM_VC_VAL_BYPASS_DATA_SHIFT;
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writel(reg_val, (*prcm)->prm_vc_val_bypass);
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/* Signal VC to send data */
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writel(reg_val | PRM_VC_VAL_BYPASS_VALID_BIT,
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(*prcm)->prm_vc_val_bypass);
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/* Wait on VC to complete transmission */
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do {
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reg_val = readl((*prcm)->prm_vc_val_bypass) &
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PRM_VC_VAL_BYPASS_VALID_BIT;
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if (!reg_val)
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break;
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sdelay(100);
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} while (--timeout);
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/* Optional: cleanup PRM_IRQSTATUS_Ax */
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/* In case we can do something about it in future.. */
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if (!timeout)
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return -1;
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/* All good.. */
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return 0;
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}
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void sri2c_init(void)
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{
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static int sri2c = 1;
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if (sri2c) {
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omap_vc_init(PRM_VC_I2C_CHANNEL_FREQ_KHZ);
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sri2c = 0;
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}
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return;
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}
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