Alexandru Gagniuc (mr.nuke.me@gmail.com) just uploaded a new patch set to gerrit, which you can find at http://review.coreboot.org/4591
-gerrit
commit 4297b8239f46b3654b7a9f3cba28e1b778f025b4 Author: Alexandru Gagniuc mr.nuke.me@gmail.com Date: Mon Dec 30 01:21:55 2013 -0500
drivers: Add support for X-Powers AXP209 PMU
Change-Id: I1de0e656a38527b172af1d0b5bcd97acbfc03bf0 Signed-off-by: Alexandru Gagniuc mr.nuke.me@gmail.com --- src/drivers/Kconfig | 1 + src/drivers/Makefile.inc | 1 + src/drivers/xpowers/Kconfig | 1 + src/drivers/xpowers/Makefile.inc | 1 + src/drivers/xpowers/axp209/Kconfig | 15 +++ src/drivers/xpowers/axp209/Makefile.inc | 3 + src/drivers/xpowers/axp209/axp209.c | 230 ++++++++++++++++++++++++++++++++ src/drivers/xpowers/axp209/axp209.h | 17 +++ 8 files changed, 269 insertions(+)
diff --git a/src/drivers/Kconfig b/src/drivers/Kconfig index b187419..8da7b05 100644 --- a/src/drivers/Kconfig +++ b/src/drivers/Kconfig @@ -37,3 +37,4 @@ source src/drivers/sil/Kconfig source src/drivers/spi/Kconfig source src/drivers/ti/Kconfig source src/drivers/trident/Kconfig +source src/drivers/xpowers/Kconfig diff --git a/src/drivers/Makefile.inc b/src/drivers/Makefile.inc index 7b1e4ca..34ae62e 100644 --- a/src/drivers/Makefile.inc +++ b/src/drivers/Makefile.inc @@ -34,4 +34,5 @@ subdirs-y += spi subdirs-y += ti subdirs-y += ipmi subdirs-y += elog +subdirs-y += xpowers subdirs-$(CONFIG_ARCH_X86) += pc80 diff --git a/src/drivers/xpowers/Kconfig b/src/drivers/xpowers/Kconfig new file mode 100644 index 0000000..3ac2748 --- /dev/null +++ b/src/drivers/xpowers/Kconfig @@ -0,0 +1 @@ +source src/drivers/xpowers/axp209/Kconfig diff --git a/src/drivers/xpowers/Makefile.inc b/src/drivers/xpowers/Makefile.inc new file mode 100644 index 0000000..ef6dffc --- /dev/null +++ b/src/drivers/xpowers/Makefile.inc @@ -0,0 +1 @@ +subdirs-$(CONFIG_DRIVER_XPOWERS_AXP209) += axp209 diff --git a/src/drivers/xpowers/axp209/Kconfig b/src/drivers/xpowers/axp209/Kconfig new file mode 100644 index 0000000..684873c --- /dev/null +++ b/src/drivers/xpowers/axp209/Kconfig @@ -0,0 +1,15 @@ +config DRIVER_XPOWERS_AXP209 + bool + default n + help + X-Powers AXP902 Power Management Unit + +if DRIVER_XPOWERS_AXP209 + +config DRIVER_XPOWERS_AXP209_BOOTBLOCK + bool + default n + help + Make AXP209 functionality available in he bootblock. + +endif # DRIVER_XPOWERS_AXP209 diff --git a/src/drivers/xpowers/axp209/Makefile.inc b/src/drivers/xpowers/axp209/Makefile.inc new file mode 100644 index 0000000..5ac691e --- /dev/null +++ b/src/drivers/xpowers/axp209/Makefile.inc @@ -0,0 +1,3 @@ +bootblock-$(CONFIG_DRIVER_XPOWERS_AXP209_BOOTBLOCK) += axp209.c +romstage-$(CONFIG_DRIVER_XPOWERS_AXP209) += axp209.c +ramstage-$(CONFIG_DRIVER_XPOWERS_AXP209) += axp209.c diff --git a/src/drivers/xpowers/axp209/axp209.c b/src/drivers/xpowers/axp209/axp209.c new file mode 100644 index 0000000..68ab8a5 --- /dev/null +++ b/src/drivers/xpowers/axp209/axp209.c @@ -0,0 +1,230 @@ +/* + * Driver for X-Powers AXP 209 Power Management Unit + * + * Despite axp209_read/write only working on a byte at a time, there is no such + * limitation in the AXP209. + * + * Copyright (C) 2013 Alexandru Gagniuc mr.nuke.me@gmail.com + * Subject to the GNU GPL v2, or (at your option) any later version. + */ + +#include "axp209.h" + +#include <device/i2c.h> + +/* Hide these definitions from the rest of the source, so keep them here */ +enum registers { + REG_POWER_STATUS = 0x00, + REG_POWER_MODE = 0x01, + REG_OTG_VBUS = 0x02, + REG_CHIP_ID = 0x03, + REG_CHIP_PWROUT_CTL = 0x12, + REG_DCDC2_VOLTAGE = 0x23, + REG_DCDC2_LDO3_CTL = 0x25, + REG_DCDC3_VOLTAGE = 0x27, + REG_LDO24_VOLTAGE = 0x28, + REG_LDO3_VOLTAGE = 0x29, + REG_VBUS_IPSOUT = 0x30, + REG_PWROFF_VOLTAGE = 0x31, + REG_SHTDWN_SETTING = 0x32, +}; + +/* REG_LDO24_VOLTAGE definitions */ +#define REG_LDO24_VOLTAGE_LDO2_MASK (0xf << 4) +#define REG_LDO24_VOLTAGE_LDO2_VAL(x) ((x << 4) & REG_LDO24_VOLTAGE_LDO2_MASK) +#define REG_LDO24_VOLTAGE_LDO4_MASK (0xf << 0) +#define REG_LDO24_VOLTAGE_LDO4_VAL(x) ((x << 0) & REG_LDO24_VOLTAGE_LDO4_MASK) + +/* + * Read and write accessors. We only work on one register at a time, but there + * is no limitation on the AXP209 as to how many registers we may read or write + * in one transaction. + * These return the number of bytes read/written, or an error code. In this + * case, they return 1 on success, or an error code otherwise. + */ +static int axp209_read(u8 bus, u8 reg, u8 *val) +{ + return i2c_read(bus, AXP209_I2C_ADDR, reg, 1, val, 1); +} + +static int axp209_write(u8 bus, u8 reg, u8 val) +{ + return i2c_write(bus, AXP209_I2C_ADDR, reg, 1, &val, 1); +} + +/** + * \brief Identify and initialize an AXP209 on the I²C bus + * + * @param[in] bus I²C bus to which the AXP209 is connected + * @return CB_SUCCES on if an AXP209 is found, or an error code otherwise. + */ +enum cb_err axp209_init(u8 bus) +{ + u8 id; + + if (axp209_read(bus, REG_CHIP_ID, &id) != 1) + return CB_ERR; + + /* From U-Boot code : Low 4 bits is chip version */ + if ((id & 0x0f) != 0x1) + return CB_ERR; + + return CB_SUCCESS; +} + +/** + * \brief Configure the output voltage of DC-DC2 converter + * + * If the requested voltage is not available, the next lowest voltage will + * be applied. + * Valid values are between 700mV and 2275mV + * + * @param[in] millivolts voltage in mV units. + * @param[in] bus I²C bus to which the AXP209 is connected + * @return CB_SUCCES on success, + * CB_ERR_ARG if voltage is out of range, or an error code otherwise. + */ +enum cb_err axp209_set_dcdc2_voltage(u8 bus, u16 millivolts) +{ + u8 val; + + if (millivolts < 700 || millivolts > 2275) + return CB_ERR_ARG; + + val = (millivolts - 700) / 25; + + if (axp209_write(bus, REG_DCDC2_VOLTAGE, val) != 1) + return CB_ERR; + + return CB_SUCCESS; +} + +/** + * \brief Configure the output voltage of DC-DC3 converter + * + * If the requested voltage is not available, the next lowest voltage will + * be applied. + * Valid values are between 700mV and 3500mV + * + * @param[in] millivolts voltage in mV units. + * @param[in] bus I²C bus to which the AXP209 is connected + * @return CB_SUCCES on success, + * CB_ERR_ARG if voltage is out of range, or an error code otherwise. + */ +enum cb_err axp209_set_dcdc3_voltage(u8 bus, u16 millivolts) +{ + u8 val; + + if (millivolts < 700 || millivolts > 3500) + return CB_ERR_ARG; + + val = (millivolts - 700) / 25; + + if (axp209_write(bus, REG_DCDC3_VOLTAGE, val) != 1) + return CB_ERR; + + return CB_SUCCESS; +} + +/** + * \brief Configure the output voltage of LDO2 regulator + * + * If the requested voltage is not available, the next lowest voltage will + * be applied. + * Valid values are between 700mV and 3300mV + * + * @param[in] millivolts voltage in mV units. + * @param[in] bus I²C bus to which the AXP209 is connected + * @return CB_SUCCES on success, + * CB_ERR_ARG if voltage is out of range, or an error code otherwise. + */ +enum cb_err axp209_set_ldo2_voltage(u8 bus, u16 millivolts) +{ + u8 reg8, val; + + if (millivolts < 1800 || millivolts > 3300) + return CB_ERR_ARG; + + /* Try to read the register first, and stop here on error */ + if (axp209_read(bus, REG_LDO24_VOLTAGE, ®8) != 1) + return CB_ERR; + + val = (millivolts - 1800) / 100; + reg8 &= ~REG_LDO24_VOLTAGE_LDO2_MASK; + reg8 |= REG_LDO24_VOLTAGE_LDO2_VAL(val); + + if (axp209_write(bus, REG_LDO24_VOLTAGE, reg8) != 1) + return CB_ERR; + + return CB_SUCCESS; +} + +/** + * \brief Configure the output voltage of LDO4 regulator + * + * If the requested voltage is not available, the next lowest voltage will + * be applied. + * Valid values are between 700mV and 3500mV. Datasheet lists maximum voltage at + * 2250mV, but hardware samples go as high as 3500mV. + * + * @param[in] millivolts voltage in mV units. + * @param[in] bus I²C bus to which the AXP209 is connected + * @return CB_SUCCES on success, + * CB_ERR_ARG if voltage is out of range, or an error code otherwise. + */ +enum cb_err axp209_set_ldo3_voltage(u8 bus, u16 millivolts) +{ + u8 val; + + /* Datasheet lists 2250 max, but PMU will output up to 3500mV */ + if (millivolts < 700 || millivolts > 3500) + return CB_ERR_ARG; + + val = (millivolts - 700) / 25; + + if (axp209_write(bus, REG_LDO3_VOLTAGE, val) != 1) + return CB_ERR; + + return CB_SUCCESS; +} + +/** + * \brief Configure the output voltage of DC-DC2 converter + * + * If the requested voltage is not available, the next lowest voltage will + * be applied. + * Valid values are between 1250V and 3300mV + * + * @param[in] millivolts voltage in mV units. + * @param[in] bus I²C bus to which the AXP209 is connected + * @return CB_SUCCES on success, + * CB_ERR_ARG if voltage is out of range, or an error code otherwise. + */ +enum cb_err axp209_set_ldo4_voltage(u8 bus, u16 millivolts) +{ + u8 reg8, val; + + if (millivolts < 1250 || millivolts > 3300) + return CB_ERR_ARG; + + /* Try to read the register first, and stop here on error */ + if (axp209_read(bus, REG_LDO24_VOLTAGE, ®8) != 1) + return CB_ERR; + + if (millivolts <= 2000) + val = (millivolts - 1200) / 100; + else if (millivolts <= 2700) + val = 9 + (millivolts - 2500) / 100; + else if (millivolts <= 2800) + val = 11; + else + val = 12 + (millivolts - 3000) / 100; + + reg8 &= ~REG_LDO24_VOLTAGE_LDO4_MASK; + reg8 |= REG_LDO24_VOLTAGE_LDO4_VAL(val); + + if (axp209_write(bus, REG_LDO24_VOLTAGE, reg8) != 1) + return CB_ERR; + + return CB_SUCCESS; +} diff --git a/src/drivers/xpowers/axp209/axp209.h b/src/drivers/xpowers/axp209/axp209.h new file mode 100644 index 0000000..1d369f5 --- /dev/null +++ b/src/drivers/xpowers/axp209/axp209.h @@ -0,0 +1,17 @@ +/* + * Definitions for X-Powers AXP 209 Power Management Unit + * + * Copyright (C) 2013 Alexandru Gagniuc mr.nuke.me@gmail.com + * Subject to the GNU GPL v2, or (at your option) any later version. + */ + +#include <types.h> + +#define AXP209_I2C_ADDR (0x68 >> 1) + +enum cb_err axp209_init(u8 bus); +enum cb_err axp209_set_dcdc2_voltage(u8 bus, u16 millivolts); +enum cb_err axp209_set_dcdc3_voltage(u8 bus, u16 millivolts); +enum cb_err axp209_set_ldo2_voltage(u8 bus, u16 millivolts); +enum cb_err axp209_set_ldo3_voltage(u8 bus, u16 millivolts); +enum cb_err axp209_set_ldo4_voltage(u8 bus, u16 millivolts);