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https://github.com/AsahiLinux/u-boot
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41575d8e4c
This construct is quite long-winded. In earlier days it made some sense since auto-allocation was a strange concept. But with driver model now used pretty universally, we can shorten this to 'auto'. This reduces verbosity and makes it easier to read. Coincidentally it also ensures that every declaration is on one line, thus making dtoc's job easier. Signed-off-by: Simon Glass <sjg@chromium.org>
106 lines
2.1 KiB
C
106 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 <log.h>
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#include <malloc.h>
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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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#include <linux/bitops.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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.rfree = 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 = sizeof(struct hisi_reset_priv),
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};
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