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![Iain Paton](/assets/img/avatar_default.png)
board/sunxi/board.c tries to set ldo3 to 2.8v however drivers/power/axp209.c contains an incorrect limit on ldo3 of 2.275v The origin of the incorrect limit seems likely due to some inconsistencies in the axp209 datasheet. ldo3 is described with different limits in different sections. register 0x29 uses 7 bits for voltage configuration while the 2.275v limit would apply if only 6 bits were used. Probably this is a cut&paste error from register 0x23 The linux kernel driver has the correct limit and operation up to the 2.8v required by my board has been physically verified with a multimeter. Signed-off-by: Iain Paton <ipaton0@gmail.com> Acked-by: Hans de Goede <hdegoede@redhat.com> Signed-off-by: Hans de Goede <hdegoede@redhat.com>
252 lines
5.0 KiB
C
252 lines
5.0 KiB
C
/*
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* (C) Copyright 2012
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* Henrik Nordstrom <henrik@henriknordstrom.net>
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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 <i2c.h>
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#include <axp209.h>
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enum axp209_reg {
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AXP209_POWER_STATUS = 0x00,
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AXP209_CHIP_VERSION = 0x03,
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AXP209_DCDC2_VOLTAGE = 0x23,
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AXP209_DCDC3_VOLTAGE = 0x27,
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AXP209_LDO24_VOLTAGE = 0x28,
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AXP209_LDO3_VOLTAGE = 0x29,
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AXP209_IRQ_ENABLE1 = 0x40,
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AXP209_IRQ_ENABLE2 = 0x41,
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AXP209_IRQ_ENABLE3 = 0x42,
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AXP209_IRQ_ENABLE4 = 0x43,
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AXP209_IRQ_ENABLE5 = 0x44,
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AXP209_IRQ_STATUS5 = 0x4c,
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AXP209_SHUTDOWN = 0x32,
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AXP209_GPIO0_CTRL = 0x90,
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AXP209_GPIO1_CTRL = 0x92,
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AXP209_GPIO2_CTRL = 0x93,
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AXP209_GPIO_STATE = 0x94,
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AXP209_GPIO3_CTRL = 0x95,
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};
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#define AXP209_POWER_STATUS_ON_BY_DC (1 << 0)
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#define AXP209_IRQ5_PEK_UP (1 << 6)
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#define AXP209_IRQ5_PEK_DOWN (1 << 5)
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#define AXP209_POWEROFF (1 << 7)
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#define AXP209_GPIO_OUTPUT_LOW 0x00 /* Drive pin low */
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#define AXP209_GPIO_OUTPUT_HIGH 0x01 /* Drive pin high */
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#define AXP209_GPIO_INPUT 0x02 /* Float pin */
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/* GPIO3 is different from the others */
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#define AXP209_GPIO3_OUTPUT_LOW 0x00 /* Drive pin low, Output mode */
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#define AXP209_GPIO3_OUTPUT_HIGH 0x02 /* Float pin, Output mode */
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#define AXP209_GPIO3_INPUT 0x06 /* Float pin, Input mode */
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static int axp209_write(enum axp209_reg reg, u8 val)
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{
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return i2c_write(0x34, reg, 1, &val, 1);
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}
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static int axp209_read(enum axp209_reg reg, u8 *val)
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{
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return i2c_read(0x34, reg, 1, val, 1);
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}
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static u8 axp209_mvolt_to_cfg(int mvolt, int min, int max, int div)
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{
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if (mvolt < min)
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mvolt = min;
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else if (mvolt > max)
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mvolt = max;
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return (mvolt - min) / div;
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}
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int axp209_set_dcdc2(int mvolt)
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{
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int rc;
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u8 cfg, current;
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cfg = axp209_mvolt_to_cfg(mvolt, 700, 2275, 25);
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/* Do we really need to be this gentle? It has built-in voltage slope */
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while ((rc = axp209_read(AXP209_DCDC2_VOLTAGE, ¤t)) == 0 &&
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current != cfg) {
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if (current < cfg)
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current++;
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else
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current--;
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rc = axp209_write(AXP209_DCDC2_VOLTAGE, current);
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if (rc)
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break;
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}
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return rc;
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}
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int axp209_set_dcdc3(int mvolt)
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{
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u8 cfg = axp209_mvolt_to_cfg(mvolt, 700, 3500, 25);
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return axp209_write(AXP209_DCDC3_VOLTAGE, cfg);
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}
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int axp209_set_ldo2(int mvolt)
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{
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int rc;
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u8 cfg, reg;
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cfg = axp209_mvolt_to_cfg(mvolt, 1800, 3300, 100);
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rc = axp209_read(AXP209_LDO24_VOLTAGE, ®);
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if (rc)
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return rc;
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/* LDO2 configuration is in upper 4 bits */
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reg = (reg & 0x0f) | (cfg << 4);
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return axp209_write(AXP209_LDO24_VOLTAGE, reg);
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}
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int axp209_set_ldo3(int mvolt)
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{
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u8 cfg;
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if (mvolt == -1)
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cfg = 0x80; /* determined by LDO3IN pin */
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else
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cfg = axp209_mvolt_to_cfg(mvolt, 700, 3500, 25);
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return axp209_write(AXP209_LDO3_VOLTAGE, cfg);
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}
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int axp209_set_ldo4(int mvolt)
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{
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int rc;
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static const int vindex[] = {
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1250, 1300, 1400, 1500, 1600, 1700, 1800, 1900, 2000, 2500,
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2700, 2800, 3000, 3100, 3200, 3300
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};
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u8 cfg, reg;
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/* Translate mvolt to register cfg value, requested <= selected */
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for (cfg = 15; vindex[cfg] > mvolt && cfg > 0; cfg--);
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rc = axp209_read(AXP209_LDO24_VOLTAGE, ®);
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if (rc)
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return rc;
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/* LDO4 configuration is in lower 4 bits */
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reg = (reg & 0xf0) | (cfg << 0);
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return axp209_write(AXP209_LDO24_VOLTAGE, reg);
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}
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int axp209_init(void)
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{
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u8 ver;
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int i, rc;
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rc = axp209_read(AXP209_CHIP_VERSION, &ver);
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if (rc)
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return rc;
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/* Low 4 bits is chip version */
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ver &= 0x0f;
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if (ver != 0x1)
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return -1;
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/* Mask all interrupts */
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for (i = AXP209_IRQ_ENABLE1; i <= AXP209_IRQ_ENABLE5; i++) {
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rc = axp209_write(i, 0);
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if (rc)
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return rc;
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}
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return 0;
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}
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int axp209_poweron_by_dc(void)
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{
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u8 v;
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if (axp209_read(AXP209_POWER_STATUS, &v))
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return 0;
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return (v & AXP209_POWER_STATUS_ON_BY_DC);
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}
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int axp209_power_button(void)
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{
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u8 v;
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if (axp209_read(AXP209_IRQ_STATUS5, &v))
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return 0;
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axp209_write(AXP209_IRQ_STATUS5, AXP209_IRQ5_PEK_DOWN);
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return v & AXP209_IRQ5_PEK_DOWN;
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}
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static u8 axp209_get_gpio_ctrl_reg(unsigned int pin)
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{
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switch (pin) {
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case 0: return AXP209_GPIO0_CTRL;
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case 1: return AXP209_GPIO1_CTRL;
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case 2: return AXP209_GPIO2_CTRL;
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case 3: return AXP209_GPIO3_CTRL;
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}
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return 0;
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}
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int axp_gpio_direction_input(unsigned int pin)
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{
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u8 reg = axp209_get_gpio_ctrl_reg(pin);
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/* GPIO3 is "special" */
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u8 val = (pin == 3) ? AXP209_GPIO3_INPUT : AXP209_GPIO_INPUT;
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return axp209_write(reg, val);
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}
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int axp_gpio_direction_output(unsigned int pin, unsigned int val)
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{
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u8 reg = axp209_get_gpio_ctrl_reg(pin);
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if (val) {
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val = (pin == 3) ? AXP209_GPIO3_OUTPUT_HIGH :
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AXP209_GPIO_OUTPUT_HIGH;
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} else {
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val = (pin == 3) ? AXP209_GPIO3_OUTPUT_LOW :
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AXP209_GPIO_OUTPUT_LOW;
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}
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return axp209_write(reg, val);
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}
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int axp_gpio_get_value(unsigned int pin)
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{
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u8 val, mask;
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int rc;
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if (pin == 3) {
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rc = axp209_read(AXP209_GPIO3_CTRL, &val);
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mask = 1;
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} else {
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rc = axp209_read(AXP209_GPIO_STATE, &val);
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mask = 1 << (pin + 4);
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}
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if (rc)
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return rc;
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return (val & mask) ? 1 : 0;
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}
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int axp_gpio_set_value(unsigned int pin, unsigned int val)
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{
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return axp_gpio_direction_output(pin, val);
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}
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