mirror of
https://github.com/AsahiLinux/u-boot
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795b2c476f
Add a reset driver to bring IPs out of reset. Signed-off-by: Keerthy <j-keerthy@ti.com> [Amjad: reset_ops structure member "free" has been renamed to "rfree", use the latter instead] Signed-off-by: Amjad Ouled-Ameur <aouledameur@baylibre.com>
97 lines
2 KiB
C
97 lines
2 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* Texas Instruments DRA7 reset driver
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*
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* Copyright (C) 2019 Texas Instruments Incorporated - http://www.ti.com/
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* Author: Keerthy <j-keerthy@ti.com>
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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 <reset-uclass.h>
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#include <dm/device_compat.h>
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struct dra7_reset_priv {
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u32 rstctrl;
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u32 rstst;
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u8 nreset;
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};
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static int dra7_reset_request(struct reset_ctl *reset_ctl)
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{
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return 0;
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}
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static int dra7_reset_free(struct reset_ctl *reset_ctl)
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{
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return 0;
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}
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static inline void dra7_reset_rmw(u32 addr, u32 value, u32 mask)
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{
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writel(((readl(addr) & (~mask)) | (value & mask)), addr);
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}
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static int dra7_reset_deassert(struct reset_ctl *reset_ctl)
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{
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struct dra7_reset_priv *priv = dev_get_priv(reset_ctl->dev);
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int mask = 1 << reset_ctl->id;
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if (reset_ctl->id < 0 || reset_ctl->id >= priv->nreset)
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return -EINVAL;
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dra7_reset_rmw(priv->rstctrl, 0x0, mask);
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while ((readl(priv->rstst) & mask) != mask)
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;
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return 0;
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}
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static int dra7_reset_assert(struct reset_ctl *reset_ctl)
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{
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struct dra7_reset_priv *priv = dev_get_priv(reset_ctl->dev);
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int mask = 1 << reset_ctl->id;
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if (reset_ctl->id < 0 || reset_ctl->id >= priv->nreset)
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return -EINVAL;
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dra7_reset_rmw(priv->rstctrl, mask, 0x0);
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return 0;
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}
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struct reset_ops dra7_reset_ops = {
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.request = dra7_reset_request,
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.rfree = dra7_reset_free,
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.rst_assert = dra7_reset_assert,
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.rst_deassert = dra7_reset_deassert,
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};
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static const struct udevice_id dra7_reset_ids[] = {
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{ .compatible = "ti,dra7-reset" },
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{ }
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};
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static int dra7_reset_probe(struct udevice *dev)
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{
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struct dra7_reset_priv *priv = dev_get_priv(dev);
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priv->rstctrl = dev_read_addr(dev);
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priv->rstst = priv->rstctrl + 0x4;
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priv->nreset = dev_read_u32_default(dev, "ti,nresets", 1);
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dev_info(dev, "dra7-reset successfully probed %s\n", dev->name);
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return 0;
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}
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U_BOOT_DRIVER(dra7_reset) = {
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.name = "dra7_reset",
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.id = UCLASS_RESET,
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.of_match = dra7_reset_ids,
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.probe = dra7_reset_probe,
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.ops = &dra7_reset_ops,
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.priv_auto = sizeof(struct dra7_reset_priv),
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};
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