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powerpc/t208xqds: VID support
The fuse status register provides the values from on-chip voltage ID efuses programmed at the factory. These values define the voltage requirements for the chip. u-boot reads FUSESR and translates the values into the appropriate commands to set the voltage output value of an external voltage regulator. Signed-off-by: Ying Zhang <b40530@freescale.com> Reviewed-by: York Sun <yorksun@freescale.com>
This commit is contained in:
Ying Zhang
York Sun
parent
e7f533cd59
commit
3ad2737ee3
5 changed files with 542 additions and 0 deletions
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@ -23,6 +23,7 @@ obj-$(CONFIG_FMAN_ENET) += fman.o
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obj-$(CONFIG_FSL_PIXIS) += pixis.o
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ifndef CONFIG_SPL_BUILD
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obj-$(CONFIG_FSL_NGPIXIS) += ngpixis.o
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obj-$(CONFIG_VID) += vid.o
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endif
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obj-$(CONFIG_FSL_QIXIS) += qixis.o
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obj-$(CONFIG_PQ_MDS_PIB) += pq-mds-pib.o
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491
board/freescale/common/vid.c
Normal file
491
board/freescale/common/vid.c
Normal file
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@ -0,0 +1,491 @@
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/*
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* Copyright 2014 Freescale Semiconductor, Inc.
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*
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* SPDX-License-Identifier: GPL-2.0+
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*/
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#include <common.h>
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#include <command.h>
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#include <i2c.h>
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#include <asm/immap_85xx.h>
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#include "vid.h"
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DECLARE_GLOBAL_DATA_PTR;
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int __weak i2c_multiplexer_select_vid_channel(u8 channel)
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{
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return 0;
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}
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/*
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* Compensate for a board specific voltage drop between regulator and SoC
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* return a value in mV
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*/
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int __weak board_vdd_drop_compensation(void)
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{
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return 0;
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}
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/*
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* Get the i2c address configuration for the IR regulator chip
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*
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* There are some variance in the RDB HW regarding the I2C address configuration
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* for the IR regulator chip, which is likely a problem of external resistor
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* accuracy. So we just check each address in a hopefully non-intrusive mode
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* and use the first one that seems to work
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*
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* The IR chip can show up under the following addresses:
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* 0x08 (Verified on T1040RDB-PA,T4240RDB-PB,X-T4240RDB-16GPA)
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* 0x09 (Verified on T1040RDB-PA)
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* 0x38 (Verified on T2080QDS, T2081QDS)
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*/
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static int find_ir_chip_on_i2c(void)
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{
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int i2caddress;
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int ret;
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u8 byte;
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int i;
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const int ir_i2c_addr[] = {0x38, 0x08, 0x09};
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/* Check all the address */
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for (i = 0; i < (sizeof(ir_i2c_addr)/sizeof(ir_i2c_addr[0])); i++) {
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i2caddress = ir_i2c_addr[i];
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ret = i2c_read(i2caddress,
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IR36021_MFR_ID_OFFSET, 1, (void *)&byte,
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sizeof(byte));
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if ((ret >= 0) && (byte == IR36021_MFR_ID))
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return i2caddress;
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}
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return -1;
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}
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/* Maximum loop count waiting for new voltage to take effect */
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#define MAX_LOOP_WAIT_NEW_VOL 100
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/* Maximum loop count waiting for the voltage to be stable */
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#define MAX_LOOP_WAIT_VOL_STABLE 100
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/*
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* read_voltage from sensor on I2C bus
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* We use average of 4 readings, waiting for WAIT_FOR_ADC before
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* another reading
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*/
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#define NUM_READINGS 4 /* prefer to be power of 2 for efficiency */
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/* If an INA220 chip is available, we can use it to read back the voltage
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* as it may have a higher accuracy than the IR chip for the same purpose
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*/
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#ifdef CONFIG_VOL_MONITOR_INA220
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#define WAIT_FOR_ADC 532 /* wait for 532 microseconds for ADC */
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#define ADC_MIN_ACCURACY 4
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#else
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#define WAIT_FOR_ADC 138 /* wait for 138 microseconds for ADC */
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#define ADC_MIN_ACCURACY 4
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#endif
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#ifdef CONFIG_VOL_MONITOR_INA220
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static int read_voltage_from_INA220(int i2caddress)
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{
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int i, ret, voltage_read = 0;
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u16 vol_mon;
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u8 buf[2];
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for (i = 0; i < NUM_READINGS; i++) {
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ret = i2c_read(I2C_VOL_MONITOR_ADDR,
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I2C_VOL_MONITOR_BUS_V_OFFSET, 1,
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(void *)&buf, 2);
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if (ret) {
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printf("VID: failed to read core voltage\n");
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return ret;
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}
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vol_mon = (buf[0] << 8) | buf[1];
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if (vol_mon & I2C_VOL_MONITOR_BUS_V_OVF) {
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printf("VID: Core voltage sensor error\n");
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return -1;
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}
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debug("VID: bus voltage reads 0x%04x\n", vol_mon);
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/* LSB = 4mv */
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voltage_read += (vol_mon >> I2C_VOL_MONITOR_BUS_V_SHIFT) * 4;
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udelay(WAIT_FOR_ADC);
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}
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/* calculate the average */
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voltage_read /= NUM_READINGS;
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return voltage_read;
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}
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#endif
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/* read voltage from IR */
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#ifdef CONFIG_VOL_MONITOR_IR36021_READ
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static int read_voltage_from_IR(int i2caddress)
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{
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int i, ret, voltage_read = 0;
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u16 vol_mon;
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u8 buf;
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for (i = 0; i < NUM_READINGS; i++) {
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ret = i2c_read(i2caddress,
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IR36021_LOOP1_VOUT_OFFSET,
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1, (void *)&buf, 1);
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if (ret) {
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printf("VID: failed to read vcpu\n");
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return ret;
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}
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vol_mon = buf;
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if (!vol_mon) {
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printf("VID: Core voltage sensor error\n");
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return -1;
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}
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debug("VID: bus voltage reads 0x%02x\n", vol_mon);
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/* Resolution is 1/128V. We scale up here to get 1/128mV
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* and divide at the end
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*/
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voltage_read += vol_mon * 1000;
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udelay(WAIT_FOR_ADC);
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}
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/* Scale down to the real mV as IR resolution is 1/128V, rounding up */
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voltage_read = DIV_ROUND_UP(voltage_read, 128);
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/* calculate the average */
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voltage_read /= NUM_READINGS;
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/* Compensate for a board specific voltage drop between regulator and
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* SoC before converting into an IR VID value
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*/
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voltage_read -= board_vdd_drop_compensation();
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return voltage_read;
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}
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#endif
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static int read_voltage(int i2caddress)
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{
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int voltage_read;
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#ifdef CONFIG_VOL_MONITOR_INA220
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voltage_read = read_voltage_from_INA220(i2caddress);
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#elif defined CONFIG_VOL_MONITOR_IR36021_READ
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voltage_read = read_voltage_from_IR(i2caddress);
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#else
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return -1;
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#endif
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return voltage_read;
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}
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/*
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* We need to calculate how long before the voltage stops to drop
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* or increase. It returns with the loop count. Each loop takes
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* several readings (WAIT_FOR_ADC)
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*/
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static int wait_for_new_voltage(int vdd, int i2caddress)
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{
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int timeout, vdd_current;
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vdd_current = read_voltage(i2caddress);
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/* wait until voltage starts to reach the target. Voltage slew
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* rates by typical regulators will always lead to stable readings
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* within each fairly long ADC interval in comparison to the
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* intended voltage delta change until the target voltage is
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* reached. The fairly small voltage delta change to any target
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* VID voltage also means that this function will always complete
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* within few iterations. If the timeout was ever reached, it would
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* point to a serious failure in the regulator system.
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*/
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for (timeout = 0;
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abs(vdd - vdd_current) > (IR_VDD_STEP_UP + IR_VDD_STEP_DOWN) &&
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timeout < MAX_LOOP_WAIT_NEW_VOL; timeout++) {
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vdd_current = read_voltage(i2caddress);
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}
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if (timeout >= MAX_LOOP_WAIT_NEW_VOL) {
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printf("VID: Voltage adjustment timeout\n");
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return -1;
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}
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return timeout;
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}
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/*
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* this function keeps reading the voltage until it is stable or until the
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* timeout expires
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*/
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static int wait_for_voltage_stable(int i2caddress)
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{
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int timeout, vdd_current, vdd;
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vdd = read_voltage(i2caddress);
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udelay(NUM_READINGS * WAIT_FOR_ADC);
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/* wait until voltage is stable */
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vdd_current = read_voltage(i2caddress);
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/* The maximum timeout is
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* MAX_LOOP_WAIT_VOL_STABLE * NUM_READINGS * WAIT_FOR_ADC
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*/
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for (timeout = MAX_LOOP_WAIT_VOL_STABLE;
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abs(vdd - vdd_current) > ADC_MIN_ACCURACY &&
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timeout > 0; timeout--) {
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vdd = vdd_current;
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udelay(NUM_READINGS * WAIT_FOR_ADC);
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vdd_current = read_voltage(i2caddress);
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}
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if (timeout == 0)
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return -1;
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return vdd_current;
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}
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#ifdef CONFIG_VOL_MONITOR_IR36021_SET
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/* Set the voltage to the IR chip */
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static int set_voltage_to_IR(int i2caddress, int vdd)
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{
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int wait, vdd_last;
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int ret;
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u8 vid;
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/* Compensate for a board specific voltage drop between regulator and
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* SoC before converting into an IR VID value
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*/
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vdd += board_vdd_drop_compensation();
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vid = DIV_ROUND_UP(vdd - 245, 5);
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ret = i2c_write(i2caddress, IR36021_LOOP1_MANUAL_ID_OFFSET,
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1, (void *)&vid, sizeof(vid));
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if (ret) {
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printf("VID: failed to write VID\n");
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return -1;
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}
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wait = wait_for_new_voltage(vdd, i2caddress);
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if (wait < 0)
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return -1;
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debug("VID: Waited %d us\n", wait * NUM_READINGS * WAIT_FOR_ADC);
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vdd_last = wait_for_voltage_stable(i2caddress);
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if (vdd_last < 0)
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return -1;
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debug("VID: Current voltage is %d mV\n", vdd_last);
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return vdd_last;
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}
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#endif
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static int set_voltage(int i2caddress, int vdd)
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{
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int vdd_last = -1;
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#ifdef CONFIG_VOL_MONITOR_IR36021_SET
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vdd_last = set_voltage_to_IR(i2caddress, vdd);
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#else
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#error Specific voltage monitor must be defined
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#endif
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return vdd_last;
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}
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int adjust_vdd(ulong vdd_override)
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{
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int re_enable = disable_interrupts();
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ccsr_gur_t __iomem *gur =
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(void __iomem *)(CONFIG_SYS_MPC85xx_GUTS_ADDR);
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u32 fusesr;
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u8 vid;
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int vdd_target, vdd_current, vdd_last;
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int ret, i2caddress;
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unsigned long vdd_string_override;
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char *vdd_string;
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static const uint16_t vdd[32] = {
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0, /* unused */
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9875, /* 0.9875V */
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9750,
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9625,
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9500,
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9375,
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9250,
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9125,
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9000,
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8875,
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8750,
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8625,
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8500,
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8375,
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8250,
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8125,
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10000, /* 1.0000V */
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10125,
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10250,
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10375,
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10500,
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10625,
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10750,
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10875,
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11000,
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0, /* reserved */
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};
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struct vdd_drive {
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u8 vid;
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unsigned voltage;
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};
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ret = i2c_multiplexer_select_vid_channel(I2C_MUX_CH_VOL_MONITOR);
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if (ret) {
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debug("VID: I2C failed to switch channel\n");
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ret = -1;
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goto exit;
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}
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ret = find_ir_chip_on_i2c();
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if (ret < 0) {
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printf("VID: Could not find voltage regulator on I2C.\n");
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ret = -1;
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goto exit;
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} else {
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i2caddress = ret;
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debug("VID: IR Chip found on I2C address 0x%02x\n", i2caddress);
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}
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/* get the voltage ID from fuse status register */
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fusesr = in_be32(&gur->dcfg_fusesr);
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/*
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* VID is used according to the table below
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* ---------------------------------------
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* | DA_V |
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* |-------------------------------------|
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* | 5b00000 | 5b00001-5b11110 | 5b11111 |
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* ---------------+---------+-----------------+---------|
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* | D | 5b00000 | NO VID | VID = DA_V | NO VID |
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* | A |----------+---------+-----------------+---------|
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* | _ | 5b00001 |VID = | VID = |VID = |
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* | V | ~ | DA_V_ALT| DA_V_ALT | DA_A_VLT|
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* | _ | 5b11110 | | | |
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* | A |----------+---------+-----------------+---------|
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* | L | 5b11111 | No VID | VID = DA_V | NO VID |
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* | T | | | | |
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* ------------------------------------------------------
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*/
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vid = (fusesr >> FSL_CORENET_DCFG_FUSESR_ALTVID_SHIFT) &
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FSL_CORENET_DCFG_FUSESR_ALTVID_MASK;
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if ((vid == 0) || (vid == FSL_CORENET_DCFG_FUSESR_ALTVID_MASK)) {
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vid = (fusesr >> FSL_CORENET_DCFG_FUSESR_VID_SHIFT) &
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FSL_CORENET_DCFG_FUSESR_VID_MASK;
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}
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vdd_target = vdd[vid];
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/* check override variable for overriding VDD */
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vdd_string = getenv(CONFIG_VID_FLS_ENV);
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if (vdd_override == 0 && vdd_string &&
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!strict_strtoul(vdd_string, 10, &vdd_string_override))
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vdd_override = vdd_string_override;
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if (vdd_override >= VDD_MV_MIN && vdd_override <= VDD_MV_MAX) {
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vdd_target = vdd_override * 10; /* convert to 1/10 mV */
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debug("VDD override is %lu\n", vdd_override);
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} else if (vdd_override != 0) {
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printf("Invalid value.\n");
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}
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if (vdd_target == 0) {
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debug("VID: VID not used\n");
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ret = 0;
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goto exit;
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} else {
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/* divide and round up by 10 to get a value in mV */
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vdd_target = DIV_ROUND_UP(vdd_target, 10);
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debug("VID: vid = %d mV\n", vdd_target);
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}
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/*
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* Read voltage monitor to check real voltage.
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*/
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vdd_last = read_voltage(i2caddress);
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if (vdd_last < 0) {
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printf("VID: Couldn't read sensor abort VID adjustment\n");
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ret = -1;
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goto exit;
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}
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vdd_current = vdd_last;
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debug("VID: Core voltage is currently at %d mV\n", vdd_last);
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/*
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* Adjust voltage to at or one step above target.
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* As measurements are less precise than setting the values
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* we may run through dummy steps that cancel each other
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* when stepping up and then down.
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*/
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while (vdd_last > 0 &&
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vdd_last < vdd_target) {
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vdd_current += IR_VDD_STEP_UP;
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vdd_last = set_voltage(i2caddress, vdd_current);
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}
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while (vdd_last > 0 &&
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vdd_last > vdd_target + (IR_VDD_STEP_DOWN - 1)) {
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vdd_current -= IR_VDD_STEP_DOWN;
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vdd_last = set_voltage(i2caddress, vdd_current);
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}
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if (vdd_last > 0)
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printf("VID: Core voltage after adjustment is at %d mV\n",
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vdd_last);
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else
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ret = -1;
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exit:
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if (re_enable)
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enable_interrupts();
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return ret;
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}
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static int print_vdd(void)
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{
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int vdd_last, ret, i2caddress;
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ret = i2c_multiplexer_select_vid_channel(I2C_MUX_CH_VOL_MONITOR);
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if (ret) {
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debug("VID : I2c failed to switch channel\n");
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return -1;
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}
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ret = find_ir_chip_on_i2c();
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if (ret < 0) {
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printf("VID: Could not find voltage regulator on I2C.\n");
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return -1;
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} else {
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i2caddress = ret;
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debug("VID: IR Chip found on I2C address 0x%02x\n", i2caddress);
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}
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/*
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* Read voltage monitor to check real voltage.
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*/
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vdd_last = read_voltage(i2caddress);
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if (vdd_last < 0) {
|
||||
printf("VID: Couldn't read sensor abort VID adjustment\n");
|
||||
return -1;
|
||||
}
|
||||
printf("VID: Core voltage is at %d mV\n", vdd_last);
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
static int do_vdd_override(cmd_tbl_t *cmdtp,
|
||||
int flag, int argc,
|
||||
char * const argv[])
|
||||
{
|
||||
ulong override;
|
||||
|
||||
if (argc < 2)
|
||||
return CMD_RET_USAGE;
|
||||
|
||||
if (!strict_strtoul(argv[1], 10, &override))
|
||||
adjust_vdd(override); /* the value is checked by callee */
|
||||
else
|
||||
return CMD_RET_USAGE;
|
||||
return 0;
|
||||
}
|
||||
|
||||
static int do_vdd_read(cmd_tbl_t *cmdtp,
|
||||
int flag, int argc,
|
||||
char * const argv[])
|
||||
{
|
||||
if (argc < 1)
|
||||
return CMD_RET_USAGE;
|
||||
print_vdd();
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
U_BOOT_CMD(
|
||||
vdd_override, 2, 0, do_vdd_override,
|
||||
"override VDD",
|
||||
" - override with the voltage specified in mV, eg. 1050"
|
||||
);
|
||||
|
||||
U_BOOT_CMD(
|
||||
vdd_read, 1, 0, do_vdd_read,
|
||||
"read VDD",
|
||||
" - Read the voltage specified in mV"
|
||||
)
|
||||
20
board/freescale/common/vid.h
Normal file
20
board/freescale/common/vid.h
Normal file
|
|
@ -0,0 +1,20 @@
|
|||
/*
|
||||
* Copyright 2014 Freescale Semiconductor, Inc.
|
||||
*
|
||||
* SPDX-License-Identifier: GPL-2.0+
|
||||
*/
|
||||
|
||||
#ifndef __VID_H_
|
||||
#define __VID_H_
|
||||
|
||||
#define IR36021_LOOP1_MANUAL_ID_OFFSET 0x6A
|
||||
#define IR36021_LOOP1_VOUT_OFFSET 0x9A
|
||||
#define IR36021_MFR_ID_OFFSET 0x92
|
||||
#define IR36021_MFR_ID 0x43
|
||||
|
||||
/* step the IR regulator in 5mV increments */
|
||||
#define IR_VDD_STEP_DOWN 5
|
||||
#define IR_VDD_STEP_UP 5
|
||||
int adjust_vdd(ulong vdd_override);
|
||||
|
||||
#endif /* __VID_H_ */
|
||||
|
|
@ -20,6 +20,7 @@
|
|||
|
||||
#include "../common/qixis.h"
|
||||
#include "../common/vsc3316_3308.h"
|
||||
#include "../common/vid.h"
|
||||
#include "t208xqds.h"
|
||||
#include "t208xqds_qixis.h"
|
||||
|
||||
|
|
@ -86,6 +87,11 @@ int select_i2c_ch_pca9547(u8 ch)
|
|||
return 0;
|
||||
}
|
||||
|
||||
int i2c_multiplexer_select_vid_channel(u8 channel)
|
||||
{
|
||||
return select_i2c_ch_pca9547(channel);
|
||||
}
|
||||
|
||||
int brd_mux_lane_to_slot(void)
|
||||
{
|
||||
ccsr_gur_t *gur = (void *)(CONFIG_SYS_MPC85xx_GUTS_ADDR);
|
||||
|
|
@ -358,6 +364,13 @@ int board_early_init_r(void)
|
|||
/* Disable remote I2C connection to qixis fpga */
|
||||
QIXIS_WRITE(brdcfg[5], QIXIS_READ(brdcfg[5]) & ~BRDCFG5_IRE);
|
||||
|
||||
/*
|
||||
* Adjust core voltage according to voltage ID
|
||||
* This function changes I2C mux to channel 2.
|
||||
*/
|
||||
if (adjust_vdd(0))
|
||||
printf("Warning: Adjusting core voltage failed.\n");
|
||||
|
||||
brd_mux_lane_to_slot();
|
||||
select_i2c_ch_pca9547(I2C_MUX_CH_DEFAULT);
|
||||
|
||||
|
|
|
|||
|
|
@ -494,6 +494,23 @@ unsigned long get_board_ddr_clk(void);
|
|||
#define I2C_MUX_PCA_ADDR_SEC2 0x76 /* I2C bus multiplexer,secondary 2 */
|
||||
#define I2C_MUX_CH_DEFAULT 0x8
|
||||
|
||||
#define I2C_MUX_CH_VOL_MONITOR 0xa
|
||||
|
||||
/* Voltage monitor on channel 2*/
|
||||
#define I2C_VOL_MONITOR_ADDR 0x40
|
||||
#define I2C_VOL_MONITOR_BUS_V_OFFSET 0x2
|
||||
#define I2C_VOL_MONITOR_BUS_V_OVF 0x1
|
||||
#define I2C_VOL_MONITOR_BUS_V_SHIFT 3
|
||||
|
||||
#define CONFIG_VID_FLS_ENV "t208xqds_vdd_mv"
|
||||
#ifndef CONFIG_SPL_BUILD
|
||||
#define CONFIG_VID
|
||||
#endif
|
||||
#define CONFIG_VOL_MONITOR_IR36021_SET
|
||||
#define CONFIG_VOL_MONITOR_IR36021_READ
|
||||
/* The lowest and highest voltage allowed for T208xQDS */
|
||||
#define VDD_MV_MIN 819
|
||||
#define VDD_MV_MAX 1212
|
||||
|
||||
/*
|
||||
* RapidIO
|
||||
|
|
|
|||
Loading…
Add table
Reference in a new issue