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185f812c41
Sphinx expects Return: and not @return to indicate a return value.
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Signed-off-by: Heinrich Schuchardt <heinrich.schuchardt@canonical.com>
139 lines
3.2 KiB
C
139 lines
3.2 KiB
C
// SPDX-License-Identifier: GPL-2.0+
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/*
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* Copyright (c) 2015 Google, Inc
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*/
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#include <common.h>
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#include <dm.h>
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#include <errno.h>
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#include <log.h>
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#include <linux/delay.h>
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#include <power/pmic.h>
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#include <power/regulator.h>
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#include <power/tps65090.h>
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static int tps65090_fet_probe(struct udevice *dev)
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{
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struct dm_regulator_uclass_plat *uc_pdata;
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uc_pdata = dev_get_uclass_plat(dev);
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uc_pdata->type = REGULATOR_TYPE_OTHER;
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uc_pdata->mode_count = 0;
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return 0;
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}
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static int tps65090_fet_get_enable(struct udevice *dev)
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{
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struct udevice *pmic = dev_get_parent(dev);
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int ret, fet_id;
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fet_id = dev->driver_data;
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debug("%s: fet_id=%d\n", __func__, fet_id);
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ret = pmic_reg_read(pmic, REG_FET_BASE + fet_id);
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if (ret < 0)
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return ret;
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return ret & FET_CTRL_ENFET;
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}
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/**
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* Set the power state for a FET
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*
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* @param pmic pmic structure for the tps65090
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* @param fet_id FET number to set (1..MAX_FET_NUM)
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* @param set 1 to power on FET, 0 to power off
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* Return: -EIO if we got a comms error, -EAGAIN if the FET failed to
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* change state. If all is ok, returns 0.
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*/
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static int tps65090_fet_set(struct udevice *pmic, int fet_id, bool set)
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{
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int retry;
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u32 value;
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int ret;
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value = FET_CTRL_ADENFET | FET_CTRL_WAIT;
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if (set)
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value |= FET_CTRL_ENFET;
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if (pmic_reg_write(pmic, REG_FET_BASE + fet_id, value))
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return -EIO;
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/* Try reading until we get a result */
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for (retry = 0; retry < MAX_CTRL_READ_TRIES; retry++) {
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ret = pmic_reg_read(pmic, REG_FET_BASE + fet_id);
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if (ret < 0)
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return ret;
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/* Check that the FET went into the expected state */
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debug("%s: flags=%x\n", __func__, ret);
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if (!!(ret & FET_CTRL_PGFET) == set)
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return 0;
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/* If we got a timeout, there is no point in waiting longer */
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if (ret & FET_CTRL_TOFET)
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break;
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mdelay(1);
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}
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debug("FET %d: Power good should have set to %d but reg=%#02x\n",
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fet_id, set, ret);
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return -EAGAIN;
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}
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static int tps65090_fet_set_enable(struct udevice *dev, bool enable)
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{
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struct udevice *pmic = dev_get_parent(dev);
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int ret, fet_id;
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ulong start;
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int loops;
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fet_id = dev->driver_data;
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debug("%s: fet_id=%d, enable=%d\n", __func__, fet_id, enable);
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start = get_timer(0);
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for (loops = 0;; loops++) {
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ret = tps65090_fet_set(pmic, fet_id, enable);
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if (!ret)
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break;
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if (get_timer(start) > 100)
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break;
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/* Turn it off and try again until we time out */
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tps65090_fet_set(pmic, fet_id, false);
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}
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if (ret)
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debug("%s: FET%d failed to power on: time=%lums, loops=%d\n",
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__func__, fet_id, get_timer(start), loops);
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else if (loops)
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debug("%s: FET%d powered on after %lums, loops=%d\n",
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__func__, fet_id, get_timer(start), loops);
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/*
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* Unfortunately there are some conditions where the power-good bit
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* will be 0, but the FET still comes up. One such case occurs with
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* the LCD backlight on snow. We'll just return 0 here and assume
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* that the FET will eventually come up.
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*/
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if (ret == -EAGAIN)
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ret = 0;
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return ret;
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}
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static const struct dm_regulator_ops tps65090_fet_ops = {
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.get_enable = tps65090_fet_get_enable,
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.set_enable = tps65090_fet_set_enable,
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};
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U_BOOT_DRIVER(tps65090_fet) = {
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.name = TPS65090_FET_DRIVER,
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.id = UCLASS_REGULATOR,
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.ops = &tps65090_fet_ops,
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.probe = tps65090_fet_probe,
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};
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