diff options
Diffstat (limited to 'drivers/power/pmic/pmic_tps65090_ec.c')
| -rw-r--r-- | drivers/power/pmic/pmic_tps65090_ec.c | 218 |
1 files changed, 218 insertions, 0 deletions
diff --git a/drivers/power/pmic/pmic_tps65090_ec.c b/drivers/power/pmic/pmic_tps65090_ec.c new file mode 100644 index 0000000000..ac0d44fec8 --- /dev/null +++ b/drivers/power/pmic/pmic_tps65090_ec.c @@ -0,0 +1,218 @@ +/* + * Copyright (c) 2013 The Chromium OS Authors. + * + * SPDX-License-Identifier: GPL-2.0+ + */ + +#include <common.h> +#include <cros_ec.h> +#include <errno.h> +#include <power/tps65090_pmic.h> + +DECLARE_GLOBAL_DATA_PTR; + +#define TPS65090_ADDR 0x48 + +static struct tps65090 { + struct cros_ec_dev *dev; /* The CROS_EC device */ +} config; + +/* TPS65090 register addresses */ +enum { + REG_IRQ1 = 0, + REG_CG_CTRL0 = 4, + REG_CG_STATUS1 = 0xa, + REG_FET1_CTRL = 0x0f, + REG_FET2_CTRL, + REG_FET3_CTRL, + REG_FET4_CTRL, + REG_FET5_CTRL, + REG_FET6_CTRL, + REG_FET7_CTRL, + TPS65090_NUM_REGS, +}; + +enum { + IRQ1_VBATG = 1 << 3, + CG_CTRL0_ENC_MASK = 0x01, + + MAX_FET_NUM = 7, + MAX_CTRL_READ_TRIES = 5, + + /* TPS65090 FET_CTRL register values */ + FET_CTRL_TOFET = 1 << 7, /* Timeout, startup, overload */ + FET_CTRL_PGFET = 1 << 4, /* Power good for FET status */ + FET_CTRL_WAIT = 3 << 2, /* Overcurrent timeout max */ + FET_CTRL_ADENFET = 1 << 1, /* Enable output auto discharge */ + FET_CTRL_ENFET = 1 << 0, /* Enable FET */ +}; + +/** + * tps65090_read - read a byte from tps6090 + * + * @param reg The register address to read from. + * @param val We'll return value value read here. + * @return 0 if ok; error if EC returns failure. + */ +static int tps65090_read(u32 reg, u8 *val) +{ + return cros_ec_i2c_xfer(config.dev, TPS65090_ADDR, reg, 1, + val, 1, true); +} + +/** + * tps65090_write - write a byte to tps6090 + * + * @param reg The register address to write to. + * @param val The value to write. + * @return 0 if ok; error if EC returns failure. + */ +static int tps65090_write(u32 reg, u8 val) +{ + return cros_ec_i2c_xfer(config.dev, TPS65090_ADDR, reg, 1, + &val, 1, false); +} + +/** + * Checks for a valid FET number + * + * @param fet_id FET number to check + * @return 0 if ok, -EINVAL if FET value is out of range + */ +static int tps65090_check_fet(unsigned int fet_id) +{ + if (fet_id == 0 || fet_id > MAX_FET_NUM) { + debug("parameter fet_id is out of range, %u not in 1 ~ %u\n", + fet_id, MAX_FET_NUM); + return -EINVAL; + } + + return 0; +} + +/** + * Set the power state for a FET + * + * @param fet_id Fet number to set (1..MAX_FET_NUM) + * @param set 1 to power on FET, 0 to power off + * @return -EIO if we got a comms error, -EAGAIN if the FET failed to + * change state. If all is ok, returns 0. + */ +static int tps65090_fet_set(int fet_id, bool set) +{ + int retry; + u8 reg, value; + + value = FET_CTRL_ADENFET | FET_CTRL_WAIT; + if (set) + value |= FET_CTRL_ENFET; + + if (tps65090_write(REG_FET1_CTRL + fet_id - 1, value)) + return -EIO; + + /* Try reading until we get a result */ + for (retry = 0; retry < MAX_CTRL_READ_TRIES; retry++) { + if (tps65090_read(REG_FET1_CTRL + fet_id - 1, ®)) + return -EIO; + + /* Check that the fet went into the expected state */ + if (!!(reg & FET_CTRL_PGFET) == set) + return 0; + + /* If we got a timeout, there is no point in waiting longer */ + if (reg & FET_CTRL_TOFET) + break; + + mdelay(1); + } + + debug("FET %d: Power good should have set to %d but reg=%#02x\n", + fet_id, set, reg); + return -EAGAIN; +} + +int tps65090_fet_enable(unsigned int fet_id) +{ + ulong start; + int loops; + int ret; + + ret = tps65090_check_fet(fet_id); + if (ret) + return ret; + + start = get_timer(0); + for (loops = 0;; loops++) { + ret = tps65090_fet_set(fet_id, true); + if (!ret) + break; + + if (get_timer(start) > 100) + break; + + /* Turn it off and try again until we time out */ + tps65090_fet_set(fet_id, false); + } + + if (ret) { + debug("%s: FET%d failed to power on: time=%lums, loops=%d\n", + __func__, fet_id, get_timer(start), loops); + } else if (loops) { + debug("%s: FET%d powered on after %lums, loops=%d\n", + __func__, fet_id, get_timer(start), loops); + } + /* + * Unfortunately, there are some conditions where the power + * good bit will be 0, but the fet still comes up. One such + * case occurs with the lcd backlight. We'll just return 0 here + * and assume that the fet will eventually come up. + */ + if (ret == -EAGAIN) + ret = 0; + + return ret; +} + +int tps65090_fet_disable(unsigned int fet_id) +{ + int ret; + + ret = tps65090_check_fet(fet_id); + if (ret) + return ret; + + ret = tps65090_fet_set(fet_id, false); + + return ret; +} + +int tps65090_fet_is_enabled(unsigned int fet_id) +{ + u8 reg = 0; + int ret; + + ret = tps65090_check_fet(fet_id); + if (ret) + return ret; + ret = tps65090_read(REG_FET1_CTRL + fet_id - 1, ®); + if (ret) { + debug("fail to read FET%u_CTRL register over I2C", fet_id); + return -EIO; + } + + return reg & FET_CTRL_ENFET; +} + +int tps65090_init(void) +{ + puts("TPS65090 PMIC EC init\n"); + + config.dev = board_get_cros_ec_dev(); + if (!config.dev) { + debug("%s: no cros_ec device: cannot init tps65090\n", + __func__); + return -ENODEV; + } + + return 0; +} |