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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>
109 lines
2.3 KiB
C
109 lines
2.3 KiB
C
// SPDX-License-Identifier: GPL-2.0+
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/*
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* Copyright (C) 2020 Sifive, Inc.
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* Author: Sagar Kadam <sagar.kadam@sifive.com>
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*/
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#include <common.h>
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#include <dm.h>
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#include <reset-uclass.h>
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#include <asm/io.h>
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#include <dm/device_compat.h>
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#include <dm/device-internal.h>
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#include <dm/lists.h>
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#include <linux/bitops.h>
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#define PRCI_RESETREG_OFFSET 0x28
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struct sifive_reset_priv {
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void *base;
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/* number of reset signals */
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int nr_reset;
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};
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static int sifive_rst_trigger(struct reset_ctl *rst, bool level)
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{
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struct sifive_reset_priv *priv = dev_get_priv(rst->dev);
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int id = rst->id;
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int regval = readl(priv->base + PRCI_RESETREG_OFFSET);
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/* Derive bitposition from rst id */
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if (level)
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/* Reset deassert */
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regval |= BIT(id);
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else
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/* Reset assert */
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regval &= ~BIT(id);
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writel(regval, priv->base + PRCI_RESETREG_OFFSET);
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return 0;
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}
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static int sifive_reset_assert(struct reset_ctl *rst)
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{
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return sifive_rst_trigger(rst, false);
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}
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static int sifive_reset_deassert(struct reset_ctl *rst)
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{
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return sifive_rst_trigger(rst, true);
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}
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static int sifive_reset_request(struct reset_ctl *rst)
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{
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struct sifive_reset_priv *priv = dev_get_priv(rst->dev);
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debug("%s(rst=%p) (dev=%p, id=%lu) (nr_reset=%d)\n", __func__,
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rst, rst->dev, rst->id, priv->nr_reset);
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if (rst->id > priv->nr_reset)
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return -EINVAL;
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return 0;
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}
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static int sifive_reset_probe(struct udevice *dev)
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{
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struct sifive_reset_priv *priv = dev_get_priv(dev);
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priv->base = dev_remap_addr(dev);
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if (!priv->base)
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return -ENOMEM;
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return 0;
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}
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int sifive_reset_bind(struct udevice *dev, ulong count)
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{
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struct udevice *rst_dev;
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struct sifive_reset_priv *priv;
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int ret;
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ret = device_bind_driver_to_node(dev, "sifive-reset", "reset",
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dev_ofnode(dev), &rst_dev);
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if (ret) {
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dev_err(dev, "failed to bind sifive_reset driver (ret=%d)\n", ret);
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return ret;
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}
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priv = malloc(sizeof(struct sifive_reset_priv));
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priv->nr_reset = count;
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dev_set_priv(rst_dev, priv);
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return 0;
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}
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const struct reset_ops sifive_reset_ops = {
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.request = sifive_reset_request,
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.rst_assert = sifive_reset_assert,
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.rst_deassert = sifive_reset_deassert,
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};
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U_BOOT_DRIVER(sifive_reset) = {
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.name = "sifive-reset",
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.id = UCLASS_RESET,
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.ops = &sifive_reset_ops,
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.probe = sifive_reset_probe,
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.priv_auto = sizeof(struct sifive_reset_priv),
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};
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