mirror of
https://github.com/AsahiLinux/u-boot
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105 lines
2.4 KiB
C
105 lines
2.4 KiB
C
// SPDX-License-Identifier: GPL-2.0+
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// (C) 2021 Pali Rohár <pali@kernel.org>
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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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#define MVEBU_SOC_CONTROL_1_REG 0x4
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#define MVEBU_PCIE_ID 0
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struct mvebu_reset_data {
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void *base;
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};
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static int mvebu_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 < 2)
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return -EINVAL;
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rst->id = args->args[0];
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rst->data = args->args[1];
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/* Currently only PCIe is implemented */
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if (rst->id != MVEBU_PCIE_ID)
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return -EINVAL;
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/* Four PCIe enable bits are shared across more PCIe links */
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if (!(rst->data >= 0 && rst->data <= 3))
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return -EINVAL;
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return 0;
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}
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static int mvebu_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 mvebu_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 mvebu_reset_assert(struct reset_ctl *rst)
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{
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struct mvebu_reset_data *data = dev_get_priv(rst->dev);
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clrbits_32(data->base + MVEBU_SOC_CONTROL_1_REG, BIT(rst->data));
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return 0;
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}
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static int mvebu_reset_deassert(struct reset_ctl *rst)
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{
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struct mvebu_reset_data *data = dev_get_priv(rst->dev);
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setbits_32(data->base + MVEBU_SOC_CONTROL_1_REG, BIT(rst->data));
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return 0;
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}
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static int mvebu_reset_status(struct reset_ctl *rst)
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{
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struct mvebu_reset_data *data = dev_get_priv(rst->dev);
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return !(readl(data->base + MVEBU_SOC_CONTROL_1_REG) & BIT(rst->data));
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}
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static int mvebu_reset_of_to_plat(struct udevice *dev)
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{
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struct mvebu_reset_data *data = dev_get_priv(dev);
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data->base = (void *)dev_read_addr(dev);
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if ((fdt_addr_t)data->base == FDT_ADDR_T_NONE)
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return -EINVAL;
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return 0;
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}
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static const struct udevice_id mvebu_reset_of_match[] = {
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{ .compatible = "marvell,armada-370-xp-system-controller" },
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{ .compatible = "marvell,armada-375-system-controller" },
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{ .compatible = "marvell,armada-380-system-controller" },
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{ .compatible = "marvell,armada-390-system-controller" },
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{ },
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};
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static const struct reset_ops mvebu_reset_ops = {
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.of_xlate = mvebu_reset_of_xlate,
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.request = mvebu_reset_request,
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.rfree = mvebu_reset_free,
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.rst_assert = mvebu_reset_assert,
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.rst_deassert = mvebu_reset_deassert,
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.rst_status = mvebu_reset_status,
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};
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U_BOOT_DRIVER(mvebu_reset) = {
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.name = "mvebu-reset",
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.id = UCLASS_RESET,
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.of_match = mvebu_reset_of_match,
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.of_to_plat = mvebu_reset_of_to_plat,
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.priv_auto = sizeof(struct mvebu_reset_data),
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.ops = &mvebu_reset_ops,
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};
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