u-boot/drivers/power/pmic/pmic_max77686.c
Przemyslaw Marczak 52a3de5e12 dm: pmic: add max77686 pmic driver
This is the implementation of driver model PMIC driver.
The max77686 PMIC driver implements read/write operations and driver
bind method - to bind its childs.

This driver will try to bind the regulator devices by using it's child
info array with regulator prefixes and driver names. This should succeed
when compatible regulator driver is compiled. If no regulator driver found,
then the pmic can still provide read/write operations, and can be used with
PMIC function calls.

Signed-off-by: Przemyslaw Marczak <p.marczak@samsung.com>
Acked-by: Simon Glass <sjg@chromium.org>
2015-05-14 18:49:38 -06:00

304 lines
5.4 KiB
C

/*
* Copyright (C) 2012 Samsung Electronics
* Rajeshwari Shinde <rajeshwari.s@samsung.com>
*
* SPDX-License-Identifier: GPL-2.0+
*/
#include <common.h>
#include <fdtdec.h>
#include <i2c.h>
#include <power/pmic.h>
#include <power/max77686_pmic.h>
#include <errno.h>
DECLARE_GLOBAL_DATA_PTR;
static const char max77686_buck_addr[] = {
0xff, 0x10, 0x12, 0x1c, 0x26, 0x30, 0x32, 0x34, 0x36, 0x38
};
static unsigned int max77686_ldo_volt2hex(int ldo, ulong uV)
{
unsigned int hex = 0;
switch (ldo) {
case 1:
case 2:
case 6:
case 7:
case 8:
case 15:
hex = (uV - 800000) / 25000;
break;
default:
hex = (uV - 800000) / 50000;
}
if (hex >= 0 && hex <= MAX77686_LDO_VOLT_MAX_HEX)
return hex;
debug("%s: %ld is wrong voltage value for LDO%d\n", __func__, uV, ldo);
return 0;
}
static int max77686_buck_volt2hex(int buck, ulong uV)
{
int hex = 0;
if (buck < 5 || buck > 9) {
debug("%s: buck %d is not supported\n", __func__, buck);
return -EINVAL;
}
hex = (uV - 750000) / 50000;
if (hex >= 0 && hex <= MAX77686_BUCK_VOLT_MAX_HEX)
return hex;
debug("%s: %ld is wrong voltage value for BUCK%d\n",
__func__, uV, buck);
return -EINVAL;
}
int max77686_set_ldo_voltage(struct pmic *p, int ldo, ulong uV)
{
unsigned int val, ret, hex, adr;
if (ldo < 1 || ldo > 26) {
printf("%s: %d is wrong ldo number\n", __func__, ldo);
return -1;
}
adr = MAX77686_REG_PMIC_LDO1CTRL1 + ldo - 1;
hex = max77686_ldo_volt2hex(ldo, uV);
if (!hex)
return -1;
ret = pmic_reg_read(p, adr, &val);
if (ret)
return ret;
val &= ~MAX77686_LDO_VOLT_MASK;
val |= hex;
ret |= pmic_reg_write(p, adr, val);
return ret;
}
int max77686_set_buck_voltage(struct pmic *p, int buck, ulong uV)
{
unsigned int val, adr;
int hex, ret;
if (buck < 5 || buck > 9) {
printf("%s: %d is an unsupported bucket number\n",
__func__, buck);
return -EINVAL;
}
adr = max77686_buck_addr[buck] + 1;
hex = max77686_buck_volt2hex(buck, uV);
if (hex < 0)
return hex;
ret = pmic_reg_read(p, adr, &val);
if (ret)
return ret;
val &= ~MAX77686_BUCK_VOLT_MASK;
ret |= pmic_reg_write(p, adr, val | hex);
return ret;
}
int max77686_set_ldo_mode(struct pmic *p, int ldo, char opmode)
{
unsigned int val, ret, adr, mode;
if (ldo < 1 || 26 < ldo) {
printf("%s: %d is wrong ldo number\n", __func__, ldo);
return -1;
}
adr = MAX77686_REG_PMIC_LDO1CTRL1 + ldo - 1;
/* mode */
switch (opmode) {
case OPMODE_OFF:
mode = MAX77686_LDO_MODE_OFF;
break;
case OPMODE_STANDBY:
switch (ldo) {
case 2:
case 6:
case 7:
case 8:
case 10:
case 11:
case 12:
case 14:
case 15:
case 16:
mode = MAX77686_LDO_MODE_STANDBY;
break;
default:
mode = 0xff;
}
break;
case OPMODE_LPM:
mode = MAX77686_LDO_MODE_LPM;
break;
case OPMODE_ON:
mode = MAX77686_LDO_MODE_ON;
break;
default:
mode = 0xff;
}
if (mode == 0xff) {
printf("%s: %d is not supported on LDO%d\n",
__func__, opmode, ldo);
return -1;
}
ret = pmic_reg_read(p, adr, &val);
if (ret)
return ret;
val &= ~MAX77686_LDO_MODE_MASK;
val |= mode;
ret |= pmic_reg_write(p, adr, val);
return ret;
}
int max77686_set_buck_mode(struct pmic *p, int buck, char opmode)
{
unsigned int val, ret, mask, adr, size, mode, mode_shift;
size = ARRAY_SIZE(max77686_buck_addr);
if (buck >= size) {
printf("%s: %d is wrong buck number\n", __func__, buck);
return -1;
}
adr = max77686_buck_addr[buck];
/* mask */
switch (buck) {
case 2:
case 3:
case 4:
mode_shift = MAX77686_BUCK_MODE_SHIFT_2;
break;
default:
mode_shift = MAX77686_BUCK_MODE_SHIFT_1;
}
mask = MAX77686_BUCK_MODE_MASK << mode_shift;
/* mode */
switch (opmode) {
case OPMODE_OFF:
mode = MAX77686_BUCK_MODE_OFF << mode_shift;
break;
case OPMODE_STANDBY:
switch (buck) {
case 1:
case 2:
case 3:
case 4:
mode = MAX77686_BUCK_MODE_STANDBY << mode_shift;
break;
default:
mode = 0xff;
}
break;
case OPMODE_LPM:
switch (buck) {
case 2:
case 3:
case 4:
mode = MAX77686_BUCK_MODE_LPM << mode_shift;
break;
default:
mode = 0xff;
}
break;
case OPMODE_ON:
mode = MAX77686_BUCK_MODE_ON << mode_shift;
break;
default:
mode = 0xff;
}
if (mode == 0xff) {
printf("%s: %d is not supported on BUCK%d\n",
__func__, opmode, buck);
return -1;
}
ret = pmic_reg_read(p, adr, &val);
if (ret)
return ret;
val &= ~mask;
val |= mode;
ret |= pmic_reg_write(p, adr, val);
return ret;
}
int pmic_init(unsigned char bus)
{
static const char name[] = "MAX77686_PMIC";
struct pmic *p = pmic_alloc();
#ifdef CONFIG_OF_CONTROL
const void *blob = gd->fdt_blob;
int node, parent, tmp;
#endif
if (!p) {
printf("%s: POWER allocation error!\n", __func__);
return -ENOMEM;
}
#ifdef CONFIG_OF_CONTROL
node = fdtdec_next_compatible(blob, 0, COMPAT_MAXIM_MAX77686_PMIC);
if (node < 0) {
debug("PMIC: No node for PMIC Chip in device tree\n");
debug("node = %d\n", node);
return -1;
}
parent = fdt_parent_offset(blob, node);
if (parent < 0) {
debug("%s: Cannot find node parent\n", __func__);
return -1;
}
/* tmp since p->bus is unsigned */
tmp = i2c_get_bus_num_fdt(parent);
if (tmp < 0) {
debug("%s: Cannot find I2C bus\n", __func__);
return -1;
}
p->bus = tmp;
p->hw.i2c.addr = fdtdec_get_int(blob, node, "reg", 9);
#else
p->bus = bus;
p->hw.i2c.addr = MAX77686_I2C_ADDR;
#endif
p->name = name;
p->interface = PMIC_I2C;
p->number_of_regs = MAX77686_NUM_OF_REGS;
p->hw.i2c.tx_num = 1;
puts("Board PMIC init\n");
return 0;
}