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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 commitc8ffd1356d, reversing changes made to2ee6f3a5f7. Reported-by: Jonas Karlman <jonas@kwiboo.se> Signed-off-by: Tom Rini <trini@konsulko.com>
118 lines
2.6 KiB
C
118 lines
2.6 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* Amlogic Meson Reset Controller driver
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*
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* Copyright (c) 2018 BayLibre, SAS.
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* Author: Neil Armstrong <narmstrong@baylibre.com>
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*/
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#include <common.h>
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#include <dm.h>
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#include <log.h>
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#include <malloc.h>
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#include <reset-uclass.h>
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#include <regmap.h>
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#include <linux/bitops.h>
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#include <linux/delay.h>
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#define BITS_PER_REG 32
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struct meson_reset_drvdata {
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unsigned int reg_count;
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unsigned int level_offset;
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};
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struct meson_reset_priv {
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struct regmap *regmap;
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struct meson_reset_drvdata *drvdata;
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};
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static int meson_reset_request(struct reset_ctl *reset_ctl)
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{
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struct meson_reset_priv *priv = dev_get_priv(reset_ctl->dev);
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struct meson_reset_drvdata *data = priv->drvdata;
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if (reset_ctl->id > (data->reg_count * BITS_PER_REG))
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return -EINVAL;
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return 0;
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}
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static int meson_reset_level(struct reset_ctl *reset_ctl, bool assert)
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{
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struct meson_reset_priv *priv = dev_get_priv(reset_ctl->dev);
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struct meson_reset_drvdata *data = priv->drvdata;
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uint bank = reset_ctl->id / BITS_PER_REG;
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uint offset = reset_ctl->id % BITS_PER_REG;
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uint reg_offset = data->level_offset + (bank << 2);
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uint val;
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regmap_read(priv->regmap, reg_offset, &val);
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if (assert)
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val &= ~BIT(offset);
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else
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val |= BIT(offset);
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regmap_write(priv->regmap, reg_offset, val);
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return 0;
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}
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static int meson_reset_assert(struct reset_ctl *reset_ctl)
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{
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return meson_reset_level(reset_ctl, true);
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}
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static int meson_reset_deassert(struct reset_ctl *reset_ctl)
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{
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return meson_reset_level(reset_ctl, false);
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}
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struct reset_ops meson_reset_ops = {
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.request = meson_reset_request,
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.rst_assert = meson_reset_assert,
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.rst_deassert = meson_reset_deassert,
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};
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static const struct meson_reset_drvdata meson_gxbb_data = {
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.reg_count = 8,
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.level_offset = 0x7c,
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};
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static const struct meson_reset_drvdata meson_a1_data = {
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.reg_count = 3,
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.level_offset = 0x40,
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};
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static const struct udevice_id meson_reset_ids[] = {
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{
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.compatible = "amlogic,meson-gxbb-reset",
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.data = (ulong)&meson_gxbb_data,
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},
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{
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.compatible = "amlogic,meson-axg-reset",
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.data = (ulong)&meson_gxbb_data,
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},
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{
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.compatible = "amlogic,meson-a1-reset",
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.data = (ulong)&meson_a1_data,
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},
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{ }
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};
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static int meson_reset_probe(struct udevice *dev)
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{
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struct meson_reset_priv *priv = dev_get_priv(dev);
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priv->drvdata = (struct meson_reset_drvdata *)dev_get_driver_data(dev);
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return regmap_init_mem(dev_ofnode(dev), &priv->regmap);
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}
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U_BOOT_DRIVER(meson_reset) = {
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.name = "meson_reset",
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.id = UCLASS_RESET,
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.of_match = meson_reset_ids,
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.probe = meson_reset_probe,
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.ops = &meson_reset_ops,
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.priv_auto = sizeof(struct meson_reset_priv),
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};
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