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d678a59d2d
When bringing in the series 'arm: dts: am62-beagleplay: Fix Beagleplay Ethernet"' I failed to notice that b4 noticed it was based on next and so took that as the base commit and merged that part of next to master. This reverts commit c8ffd1356d42223cbb8c86280a083cc3c93e6426, reversing changes made to 2ee6f3a5f7550de3599faef9704e166e5dcace35. Reported-by: Jonas Karlman <jonas@kwiboo.se> Signed-off-by: Tom Rini <trini@konsulko.com>
140 lines
3.2 KiB
C
140 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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