mirror of
https://github.com/AsahiLinux/u-boot
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0be4b0b651
In case the ops is not implemented, return 0 in the core right away. This is better than having multiple copies of functions which just return 0 in each reset driver. Drop all those empty functions. Signed-off-by: Marek Vasut <marex@denx.de> Cc: Simon Glass <sjg@chromium.org> Cc: Tom Rini <trini@konsulko.com>
120 lines
2.6 KiB
C
120 lines
2.6 KiB
C
// SPDX-License-Identifier: (GPL-2.0+ OR MIT)
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/*
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* Copyright (C) 2018 Amarula Solutions.
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* Author: Jagan Teki <jagan@amarulasolutions.com>
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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 <log.h>
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#include <malloc.h>
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#include <reset-uclass.h>
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#include <asm/io.h>
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#include <clk/sunxi.h>
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#include <dm/device-internal.h>
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#include <dm/lists.h>
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#include <linux/bitops.h>
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#include <linux/log2.h>
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struct sunxi_reset_priv {
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void *base;
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ulong count;
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const struct ccu_desc *desc;
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};
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static const struct ccu_reset *priv_to_reset(struct sunxi_reset_priv *priv,
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unsigned long id)
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{
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return &priv->desc->resets[id];
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}
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static int sunxi_reset_request(struct reset_ctl *reset_ctl)
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{
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struct sunxi_reset_priv *priv = dev_get_priv(reset_ctl->dev);
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debug("%s: (RST#%ld)\n", __func__, reset_ctl->id);
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if (reset_ctl->id >= priv->count)
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return -EINVAL;
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return 0;
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}
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static int sunxi_set_reset(struct reset_ctl *reset_ctl, bool on)
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{
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struct sunxi_reset_priv *priv = dev_get_priv(reset_ctl->dev);
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const struct ccu_reset *reset = priv_to_reset(priv, reset_ctl->id);
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u32 reg;
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if (!(reset->flags & CCU_RST_F_IS_VALID)) {
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printf("%s: (RST#%ld) unhandled\n", __func__, reset_ctl->id);
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return 0;
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}
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debug("%s: (RST#%ld) off#0x%x, BIT(%d)\n", __func__,
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reset_ctl->id, reset->off, ilog2(reset->bit));
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reg = readl(priv->base + reset->off);
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if (on)
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reg |= reset->bit;
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else
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reg &= ~reset->bit;
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writel(reg, priv->base + reset->off);
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return 0;
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}
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static int sunxi_reset_assert(struct reset_ctl *reset_ctl)
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{
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return sunxi_set_reset(reset_ctl, false);
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}
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static int sunxi_reset_deassert(struct reset_ctl *reset_ctl)
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{
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return sunxi_set_reset(reset_ctl, true);
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}
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struct reset_ops sunxi_reset_ops = {
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.request = sunxi_reset_request,
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.rst_assert = sunxi_reset_assert,
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.rst_deassert = sunxi_reset_deassert,
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};
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static int sunxi_reset_probe(struct udevice *dev)
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{
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struct sunxi_reset_priv *priv = dev_get_priv(dev);
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priv->base = dev_read_addr_ptr(dev);
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return 0;
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}
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int sunxi_reset_bind(struct udevice *dev, ulong count)
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{
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struct udevice *rst_dev;
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struct sunxi_reset_priv *priv;
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int ret;
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ret = device_bind_driver_to_node(dev, "sunxi_reset", "reset",
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dev_ofnode(dev), &rst_dev);
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if (ret) {
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debug("failed to bind sunxi_reset driver (ret=%d)\n", ret);
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return ret;
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}
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priv = malloc(sizeof(struct sunxi_reset_priv));
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priv->count = count;
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priv->desc = (const struct ccu_desc *)dev_get_driver_data(dev);
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dev_set_priv(rst_dev, priv);
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return 0;
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}
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U_BOOT_DRIVER(sunxi_reset) = {
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.name = "sunxi_reset",
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.id = UCLASS_RESET,
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.ops = &sunxi_reset_ops,
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.probe = sunxi_reset_probe,
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.priv_auto = sizeof(struct sunxi_reset_priv),
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};
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