90 lines
1.8 KiB
C
90 lines
1.8 KiB
C
/*
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* Copyright (C) 2017 Álvaro Fernández Rojas <noltari@gmail.com>
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*
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* Derived from linux/arch/mips/bcm63xx/reset.c:
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* Copyright (C) 2012 Jonas Gorski <jonas.gorski@gmail.com>
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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 <errno.h>
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#include <reset-uclass.h>
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#include <asm/io.h>
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#define MAX_RESETS 32
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struct bcm6345_reset_priv {
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void __iomem *regs;
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};
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static int bcm6345_reset_assert(struct reset_ctl *rst)
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{
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struct bcm6345_reset_priv *priv = dev_get_priv(rst->dev);
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clrbits_be32(priv->regs, BIT(rst->id));
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mdelay(20);
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return 0;
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}
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static int bcm6345_reset_deassert(struct reset_ctl *rst)
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{
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struct bcm6345_reset_priv *priv = dev_get_priv(rst->dev);
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setbits_be32(priv->regs, BIT(rst->id));
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mdelay(20);
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return 0;
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}
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static int bcm6345_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 bcm6345_reset_request(struct reset_ctl *rst)
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{
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if (rst->id >= MAX_RESETS)
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return -EINVAL;
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return bcm6345_reset_assert(rst);
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}
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struct reset_ops bcm6345_reset_reset_ops = {
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.free = bcm6345_reset_free,
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.request = bcm6345_reset_request,
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.rst_assert = bcm6345_reset_assert,
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.rst_deassert = bcm6345_reset_deassert,
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};
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static const struct udevice_id bcm6345_reset_ids[] = {
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{ .compatible = "brcm,bcm6345-reset" },
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{ /* sentinel */ }
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};
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static int bcm6345_reset_probe(struct udevice *dev)
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{
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struct bcm6345_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 = devfdt_get_addr_size_index(dev, 0, &size);
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if (addr == FDT_ADDR_T_NONE)
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return -EINVAL;
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priv->regs = ioremap(addr, size);
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return 0;
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}
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U_BOOT_DRIVER(bcm6345_reset) = {
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.name = "bcm6345-reset",
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.id = UCLASS_RESET,
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.of_match = bcm6345_reset_ids,
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.ops = &bcm6345_reset_reset_ops,
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.probe = bcm6345_reset_probe,
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.priv_auto_alloc_size = sizeof(struct bcm6345_reset_priv),
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};
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