From 14bc66bd9a1d8073a12c6e785ab379909f620356 Mon Sep 17 00:00:00 2001 From: Henrik Nordstrom Date: Fri, 13 Jun 2014 22:55:50 +0200 Subject: sunxi: Add axp209 pmic support Add support for the x-powers axp209 pmic which is found on most A10, A13 and A20 boards. And enable AXP209 support for the Cubietruck and Cubieboard boards. Signed-off-by: Henrik Nordstrom Signed-off-by: Hans de Goede Acked-by: Ian Campbell --- drivers/power/axp209.c | 167 +++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 167 insertions(+) create mode 100644 drivers/power/axp209.c (limited to 'drivers/power/axp209.c') diff --git a/drivers/power/axp209.c b/drivers/power/axp209.c new file mode 100644 index 0000000..9798e5b --- /dev/null +++ b/drivers/power/axp209.c @@ -0,0 +1,167 @@ +/* + * (C) Copyright 2012 + * Henrik Nordstrom + * + * SPDX-License-Identifier: GPL-2.0+ + */ + +#include +#include +#include + +enum axp209_reg { + AXP209_POWER_STATUS = 0x00, + AXP209_CHIP_VERSION = 0x03, + AXP209_DCDC2_VOLTAGE = 0x23, + AXP209_DCDC3_VOLTAGE = 0x27, + AXP209_LDO24_VOLTAGE = 0x28, + AXP209_LDO3_VOLTAGE = 0x29, + AXP209_IRQ_STATUS5 = 0x4c, + AXP209_SHUTDOWN = 0x32, +}; + +#define AXP209_POWER_STATUS_ON_BY_DC (1 << 0) + +#define AXP209_IRQ5_PEK_UP (1 << 6) +#define AXP209_IRQ5_PEK_DOWN (1 << 5) + +#define AXP209_POWEROFF (1 << 7) + +static int axp209_write(enum axp209_reg reg, u8 val) +{ + return i2c_write(0x34, reg, 1, &val, 1); +} + +static int axp209_read(enum axp209_reg reg, u8 *val) +{ + return i2c_read(0x34, reg, 1, val, 1); +} + +static u8 axp209_mvolt_to_cfg(int mvolt, int min, int max, int div) +{ + if (mvolt < min) + mvolt = min; + else if (mvolt > max) + mvolt = max; + + return (mvolt - min) / div; +} + +int axp209_set_dcdc2(int mvolt) +{ + int rc; + u8 cfg, current; + + cfg = axp209_mvolt_to_cfg(mvolt, 700, 2275, 25); + + /* Do we really need to be this gentle? It has built-in voltage slope */ + while ((rc = axp209_read(AXP209_DCDC2_VOLTAGE, ¤t)) == 0 && + current != cfg) { + if (current < cfg) + current++; + else + current--; + + rc = axp209_write(AXP209_DCDC2_VOLTAGE, current); + if (rc) + break; + } + + return rc; +} + +int axp209_set_dcdc3(int mvolt) +{ + u8 cfg = axp209_mvolt_to_cfg(mvolt, 700, 3500, 25); + + return axp209_write(AXP209_DCDC3_VOLTAGE, cfg); +} + +int axp209_set_ldo2(int mvolt) +{ + int rc; + u8 cfg, reg; + + cfg = axp209_mvolt_to_cfg(mvolt, 1800, 3300, 100); + + rc = axp209_read(AXP209_LDO24_VOLTAGE, ®); + if (rc) + return rc; + + /* LDO2 configuration is in upper 4 bits */ + reg = (reg & 0x0f) | (cfg << 4); + return axp209_write(AXP209_LDO24_VOLTAGE, reg); +} + +int axp209_set_ldo3(int mvolt) +{ + u8 cfg; + + if (mvolt == -1) + cfg = 0x80; /* determined by LDO3IN pin */ + else + cfg = axp209_mvolt_to_cfg(mvolt, 700, 2275, 25); + + return axp209_write(AXP209_LDO3_VOLTAGE, cfg); +} + +int axp209_set_ldo4(int mvolt) +{ + int rc; + static const int vindex[] = { + 1250, 1300, 1400, 1500, 1600, 1700, 1800, 1900, 2000, 2500, + 2700, 2800, 3000, 3100, 3200, 3300 + }; + u8 cfg, reg; + + /* Translate mvolt to register cfg value, requested <= selected */ + for (cfg = 15; vindex[cfg] > mvolt && cfg > 0; cfg--); + + rc = axp209_read(AXP209_LDO24_VOLTAGE, ®); + if (rc) + return rc; + + /* LDO4 configuration is in lower 4 bits */ + reg = (reg & 0xf0) | (cfg << 0); + return axp209_write(AXP209_LDO24_VOLTAGE, reg); +} + +int axp209_init(void) +{ + u8 ver; + int rc; + + rc = axp209_read(AXP209_CHIP_VERSION, &ver); + if (rc) + return rc; + + /* Low 4 bits is chip version */ + ver &= 0x0f; + + if (ver != 0x1) + return -1; + + return 0; +} + +int axp209_poweron_by_dc(void) +{ + u8 v; + + if (axp209_read(AXP209_POWER_STATUS, &v)) + return 0; + + return (v & AXP209_POWER_STATUS_ON_BY_DC); +} + +int axp209_power_button(void) +{ + u8 v; + + if (axp209_read(AXP209_IRQ_STATUS5, &v)) + return 0; + + axp209_write(AXP209_IRQ_STATUS5, AXP209_IRQ5_PEK_DOWN); + + return v & AXP209_IRQ5_PEK_DOWN; +} -- cgit v1.1