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f5e6c168c1
It adds a Driver Model compatible reset driver for HiSlicon platform. The driver implements a custom .of_xlate function, and uses .data field as reset register offset and .id field as bit shift. Signed-off-by: Shawn Guo <shawn.guo@linaro.org> Acked-by: Joe Hershberger <joe.hershberger@ni.com>
104 lines
2.1 KiB
C
104 lines
2.1 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* Copyright (c) 2019, Linaro Limited
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*/
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#include <asm/io.h>
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#include <common.h>
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#include <dm.h>
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#include <dt-bindings/reset/ti-syscon.h>
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#include <reset-uclass.h>
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struct hisi_reset_priv {
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void __iomem *base;
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};
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static int hisi_reset_deassert(struct reset_ctl *rst)
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{
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struct hisi_reset_priv *priv = dev_get_priv(rst->dev);
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u32 val;
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val = readl(priv->base + rst->data);
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if (rst->polarity & DEASSERT_SET)
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val |= BIT(rst->id);
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else
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val &= ~BIT(rst->id);
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writel(val, priv->base + rst->data);
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return 0;
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}
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static int hisi_reset_assert(struct reset_ctl *rst)
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{
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struct hisi_reset_priv *priv = dev_get_priv(rst->dev);
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u32 val;
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val = readl(priv->base + rst->data);
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if (rst->polarity & ASSERT_SET)
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val |= BIT(rst->id);
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else
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val &= ~BIT(rst->id);
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writel(val, priv->base + rst->data);
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return 0;
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}
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static int hisi_reset_free(struct reset_ctl *rst)
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{
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return 0;
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}
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static int hisi_reset_request(struct reset_ctl *rst)
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{
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return 0;
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}
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static int hisi_reset_of_xlate(struct reset_ctl *rst,
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struct ofnode_phandle_args *args)
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{
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if (args->args_count != 3) {
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debug("Invalid args_count: %d\n", args->args_count);
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return -EINVAL;
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}
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/* Use .data field as register offset and .id field as bit shift */
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rst->data = args->args[0];
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rst->id = args->args[1];
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rst->polarity = args->args[2];
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return 0;
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}
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static const struct reset_ops hisi_reset_reset_ops = {
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.of_xlate = hisi_reset_of_xlate,
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.request = hisi_reset_request,
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.free = hisi_reset_free,
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.rst_assert = hisi_reset_assert,
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.rst_deassert = hisi_reset_deassert,
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};
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static const struct udevice_id hisi_reset_ids[] = {
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{ .compatible = "hisilicon,hi3798cv200-reset" },
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{ }
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};
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static int hisi_reset_probe(struct udevice *dev)
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{
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struct hisi_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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U_BOOT_DRIVER(hisi_reset) = {
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.name = "hisilicon_reset",
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.id = UCLASS_RESET,
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.of_match = hisi_reset_ids,
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.ops = &hisi_reset_reset_ops,
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.probe = hisi_reset_probe,
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.priv_auto_alloc_size = sizeof(struct hisi_reset_priv),
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};
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