105 lines
2.6 KiB
C
105 lines
2.6 KiB
C
/*
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* (C) Copyright 2017 Rockchip Electronics Co., Ltd
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*
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* SPDX-License-Identifier: GPL-2.0
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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 <linux/io.h>
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struct rockchip_reset_priv {
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void __iomem *base;
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unsigned int sf_reset_offset;
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unsigned int sf_reset_num;
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};
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static int rockchip_reset_request(struct reset_ctl *reset_ctl)
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{
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struct rockchip_reset_priv *priv = dev_get_priv(reset_ctl->dev);
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debug("%s(reset_ctl=%p) (dev=%p, id=%lu) (sf_reset_num=%d)\n", __func__,
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reset_ctl, reset_ctl->dev, reset_ctl->id, priv->sf_reset_num);
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if (reset_ctl->id / 16 >= priv->sf_reset_num)
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return -EINVAL;
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return 0;
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}
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static int rockchip_reset_free(struct reset_ctl *reset_ctl)
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{
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debug("%s(reset_ctl=%p) (dev=%p, id=%lu)\n", __func__, reset_ctl,
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reset_ctl->dev, reset_ctl->id);
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return 0;
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}
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static int rockchip_reset_assert(struct reset_ctl *reset_ctl)
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{
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struct rockchip_reset_priv *priv = dev_get_priv(reset_ctl->dev);
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int bank = reset_ctl->id / 16;
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int offset = reset_ctl->id % 16;
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debug("%s(reset_ctl=%p) (dev=%p, id=%lu) (reg_addr=%p)\n", __func__,
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reset_ctl, reset_ctl->dev, reset_ctl->id,
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priv->base + (bank * 4));
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writel(BIT(offset) | (BIT(offset) << 16), priv->base + (bank * 4));
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return 0;
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}
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static int rockchip_reset_deassert(struct reset_ctl *reset_ctl)
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{
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struct rockchip_reset_priv *priv = dev_get_priv(reset_ctl->dev);
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int bank = reset_ctl->id / 16;
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int offset = reset_ctl->id % 16;
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debug("%s(reset_ctl=%p) (dev=%p, id=%lu) (reg_addr=%p)\n", __func__,
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reset_ctl, reset_ctl->dev, reset_ctl->id,
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priv->base + (bank * 4));
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writel((BIT(offset) << 16), priv->base + (bank * 4));
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return 0;
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}
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struct reset_ops rockchip_reset_ops = {
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.request = rockchip_reset_request,
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.free = rockchip_reset_free,
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.rst_assert = rockchip_reset_assert,
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.rst_deassert = rockchip_reset_deassert,
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};
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static int rockchip_reset_probe(struct udevice *dev)
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{
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struct rockchip_reset_priv *priv = dev_get_priv(dev);
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fdt_addr_t addr;
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fdt_size_t size;
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addr = dev_read_addr_size(dev, "reg", &size);
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if (addr == FDT_ADDR_T_NONE)
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return -EINVAL;
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if ((priv->sf_reset_offset == 0) && (priv->sf_reset_num == 0))
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return -EINVAL;
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addr += priv->sf_reset_offset;
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priv->base = ioremap(addr, size);
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debug("%s(base=%p) (sf_reset_offset=%x, sf_reset_num=%d)\n", __func__,
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priv->base, priv->sf_reset_offset, priv->sf_reset_num);
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return 0;
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}
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U_BOOT_DRIVER(rockchip_reset) = {
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.name = "rockchip_reset",
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.id = UCLASS_RESET,
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.probe = rockchip_reset_probe,
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.ops = &rockchip_reset_ops,
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.priv_auto_alloc_size = sizeof(struct rockchip_reset_priv),
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};
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