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![Shaveta Leekha](/assets/img/avatar_default.png)
Adds Support for PowerOne ZM7300 voltage regulator. This device is available on some Freescale Boards like B4860QDS and has to be programmed to adjust the voltage on the board. The device is accessible via I2C interface. Signed-off-by: Shaveta Leekha <shaveta@freescale.com> Signed-off-by: Poonam Aggrwal <poonam.aggrwal@freescale.com>
236 lines
3.5 KiB
C
236 lines
3.5 KiB
C
/*
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* Copyright 2013 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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/* Power-One ZM7300 DPM */
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#include "zm7300.h"
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#define DPM_WP 0x96
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#define WRP_OPCODE 0x01
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#define WRM_OPCODE 0x02
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#define RRP_OPCODE 0x11
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#define DPM_SUCCESS 0x01
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#define DPM_EXEC_FAIL 0x00
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static const uint16_t hex_to_1_10mv[] = {
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5000,
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5125,
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5250,
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5375,
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5500,
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5625,
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5750,
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5875,
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6000,
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6125,
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6250,
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6375,
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6500,
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6625,
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6750,
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6875,
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7000,
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7125,
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7250,
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7375,
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7500,
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7625,
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7750,
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7875,
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8000,
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8125,
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8250,
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8375,
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8500,
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8625,
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8750,
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8875,
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9000,
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9125,
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9250,
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9375,
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9500, /* 0.95mV */
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9625,
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9750,
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9875,
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10000, /* 1.0V */
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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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11125,
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11250,
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11375,
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11500,
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11625,
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11750,
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11875,
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12000,
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12125,
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12250,
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12375,
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0, /* reserved */
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};
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/* Read Data d from Register r of POL p */
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u8 dpm_rrp(uchar r)
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{
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u8 ret[5];
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ret[0] = RRP_OPCODE;
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/* POL is 0 */
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ret[1] = 0;
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ret[2] = r;
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i2c_read(I2C_DPM_ADDR, 0, -3, ret, 2);
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if (ret[1] == DPM_SUCCESS) { /* the DPM returned success as status */
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debug("RRP_OPCODE returned success data is %x\n", ret[0]);
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return ret[0];
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} else {
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return -1;
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}
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}
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/* Write Data d into DPM register r (RAM) */
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int dpm_wrm(u8 r, u8 d)
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{
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u8 ret[5];
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ret[0] = WRM_OPCODE;
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ret[1] = r;
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ret[2] = d;
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i2c_read(I2C_DPM_ADDR, 0, -3, ret, 1);
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if (ret[0] == DPM_SUCCESS) { /* the DPM returned success as status */
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debug("WRM_OPCODE returned success data is %x\n", ret[0]);
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return ret[0];
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} else {
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return -1;
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}
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}
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/* Write Data d into Register r of POL(s) a */
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int dpm_wrp(u8 r, u8 d)
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{
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u8 ret[7];
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ret[0] = WRP_OPCODE;
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/* only POL0 is present */
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ret[1] = 0x01;
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ret[2] = 0x00;
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ret[3] = 0x00;
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ret[4] = 0x00;
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ret[5] = r;
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ret[6] = d;
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i2c_read(I2C_DPM_ADDR, 0, -7, ret, 1);
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if (ret[0] == DPM_SUCCESS) { /* the DPM returned success as status */
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debug("WRP_OPCODE returned success data is %x\n", ret[0]);
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return 0;
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} else {
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return -1;
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}
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}
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/* Uses the DPM command RRP */
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u8 zm_read(uchar reg)
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{
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u8 d;
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d = dpm_rrp(reg);
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return d;
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}
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/* ZM_write --
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Steps:
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a. Write data to the register
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b. Read data from register and compare to written value
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c. Return return_code & voltage_read
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*/
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u8 zm_write(u8 reg, u8 data)
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{
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u8 d;
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/* write data to register */
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dpm_wrp(reg, data);
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/* read register and compare to written value */
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d = dpm_rrp(reg);
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if (d != data) {
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printf("zm_write : Comparison register data failed\n");
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return -1;
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}
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return d;
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}
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/* zm_write_out_voltage
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* voltage in 1/10 mV
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*/
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int zm_write_voltage(int voltage)
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{
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u8 reg = 0x7, vid;
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uint16_t voltage_read;
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u8 ret;
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vid = (voltage - 5000) / ZM_STEP;
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ret = zm_write(reg, vid);
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if (ret != -1) {
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voltage_read = hex_to_1_10mv[ret];
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debug("voltage set to %dmV\n", voltage_read/10);
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return voltage_read;
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}
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return -1;
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}
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/* zm_read_out_voltage
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* voltage in 1/10 mV
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*/
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int zm_read_voltage(void)
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{
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u8 reg = 0x7;
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u8 ret;
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int voltage;
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ret = zm_read(reg);
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if (ret != -1) {
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voltage = hex_to_1_10mv[ret];
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debug("Voltage read is %dmV\n", voltage/10);
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return voltage;
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} else {
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return -1;
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}
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}
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int zm_disable_wp()
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{
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u8 new_wp_value;
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/* Disable using Write-Protect register 0x96 */
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new_wp_value = 0x8;
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if ((dpm_wrm(DPM_WP, new_wp_value)) < 0) {
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printf("Disable Write-Protect register failed\n");
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return -1;
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}
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return 0;
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}
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int zm_enable_wp()
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{
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u8 orig_wp_value;
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orig_wp_value = 0x0;
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/* Enable using Write-Protect register 0x96 */
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if ((dpm_wrm(DPM_WP, orig_wp_value)) < 0) {
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printf("Enable Write-Protect register failed\n");
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return -1;
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}
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return 0;
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}
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