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// SPDX-License-Identifier: GPL-2.0+
/*
* Copyright 2013 Freescale Semiconductor, Inc.
*/
/* Power-One ZM7300 DPM */
#include "zm7300.h"
#define DPM_WP 0x96
#define WRP_OPCODE 0x01
#define WRM_OPCODE 0x02
#define RRP_OPCODE 0x11
#define DPM_SUCCESS 0x01
#define DPM_EXEC_FAIL 0x00
static const uint16_t hex_to_1_10mv[] = {
5000,
5125,
5250,
5375,
5500,
5625,
5750,
5875,
6000,
6125,
6250,
6375,
6500,
6625,
6750,
6875,
7000,
7125,
7250,
7375,
7500,
7625,
7750,
7875,
8000,
8125,
8250,
8375,
8500,
8625,
8750,
8875,
9000,
9125,
9250,
9375,
9500, /* 0.95mV */
9625,
9750,
9875,
10000, /* 1.0V */
10125,
10250,
10375,
10500,
10625,
10750,
10875,
11000,
11125,
11250,
11375,
11500,
11625,
11750,
11875,
12000,
12125,
12250,
12375,
0, /* reserved */
};
/* Read Data d from Register r of POL p */
u8 dpm_rrp(uchar r)
{
u8 ret[5];
ret[0] = RRP_OPCODE;
/* POL is 0 */
ret[1] = 0;
ret[2] = r;
i2c_read(I2C_DPM_ADDR, 0, -3, ret, 2);
if (ret[1] == DPM_SUCCESS) { /* the DPM returned success as status */
debug("RRP_OPCODE returned success data is %x\n", ret[0]);
return ret[0];
} else {
return -1;
}
}
/* Write Data d into DPM register r (RAM) */
int dpm_wrm(u8 r, u8 d)
{
u8 ret[5];
ret[0] = WRM_OPCODE;
ret[1] = r;
ret[2] = d;
i2c_read(I2C_DPM_ADDR, 0, -3, ret, 1);
if (ret[0] == DPM_SUCCESS) { /* the DPM returned success as status */
debug("WRM_OPCODE returned success data is %x\n", ret[0]);
return ret[0];
} else {
return -1;
}
}
/* Write Data d into Register r of POL(s) a */
int dpm_wrp(u8 r, u8 d)
{
u8 ret[7];
ret[0] = WRP_OPCODE;
/* only POL0 is present */
ret[1] = 0x01;
ret[2] = 0x00;
ret[3] = 0x00;
ret[4] = 0x00;
ret[5] = r;
ret[6] = d;
i2c_read(I2C_DPM_ADDR, 0, -7, ret, 1);
if (ret[0] == DPM_SUCCESS) { /* the DPM returned success as status */
debug("WRP_OPCODE returned success data is %x\n", ret[0]);
return 0;
} else {
return -1;
}
}
/* Uses the DPM command RRP */
u8 zm_read(uchar reg)
{
return dpm_rrp(reg);
}
/* ZM_write --
Steps:
a. Write data to the register
b. Read data from register and compare to written value
c. Return return_code & voltage_read
*/
u8 zm_write(u8 reg, u8 data)
{
u8 d;
/* write data to register */
dpm_wrp(reg, data);
/* read register and compare to written value */
d = dpm_rrp(reg);
if (d != data) {
printf("zm_write : Comparison register data failed\n");
return -1;
}
return d;
}
/* zm_write_out_voltage
* voltage in 1/10 mV
*/
int zm_write_voltage(int voltage)
{
u8 reg = 0x7, vid;
uint16_t voltage_read;
u8 ret;
vid = (voltage - 5000) / ZM_STEP;
ret = zm_write(reg, vid);
if (ret != -1) {
voltage_read = hex_to_1_10mv[ret];
debug("voltage set to %dmV\n", voltage_read/10);
return voltage_read;
}
return -1;
}
/* zm_read_out_voltage
* voltage in 1/10 mV
*/
int zm_read_voltage(void)
{
u8 reg = 0x7;
u8 ret;
int voltage;
ret = zm_read(reg);
if (ret != -1) {
voltage = hex_to_1_10mv[ret];
debug("Voltage read is %dmV\n", voltage/10);
return voltage;
} else {
return -1;
}
}
int zm_disable_wp()
{
u8 new_wp_value;
/* Disable using Write-Protect register 0x96 */
new_wp_value = 0x8;
if ((dpm_wrm(DPM_WP, new_wp_value)) < 0) {
printf("Disable Write-Protect register failed\n");
return -1;
}
return 0;
}
int zm_enable_wp()
{
u8 orig_wp_value;
orig_wp_value = 0x0;
/* Enable using Write-Protect register 0x96 */
if ((dpm_wrm(DPM_WP, orig_wp_value)) < 0) {
printf("Enable Write-Protect register failed\n");
return -1;
}
return 0;
}
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