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- // SPDX-License-Identifier: (GPL-2.0+ OR MIT)
- /*
- * Copyright (C) 2018 Amarula Solutions.
- * Author: Jagan Teki <jagan@amarulasolutions.com>
- */
- #include <common.h>
- #include <dm.h>
- #include <errno.h>
- #include <reset-uclass.h>
- #include <asm/io.h>
- #include <dm/lists.h>
- #include <linux/log2.h>
- #include <asm/arch/ccu.h>
- struct sunxi_reset_priv {
- void *base;
- ulong count;
- const struct ccu_desc *desc;
- };
- static const struct ccu_reset *priv_to_reset(struct sunxi_reset_priv *priv,
- unsigned long id)
- {
- return &priv->desc->resets[id];
- }
- static int sunxi_reset_request(struct reset_ctl *reset_ctl)
- {
- struct sunxi_reset_priv *priv = dev_get_priv(reset_ctl->dev);
- debug("%s: (RST#%ld)\n", __func__, reset_ctl->id);
- if (reset_ctl->id >= priv->count)
- return -EINVAL;
- return 0;
- }
- static int sunxi_reset_free(struct reset_ctl *reset_ctl)
- {
- debug("%s: (RST#%ld)\n", __func__, reset_ctl->id);
- return 0;
- }
- static int sunxi_set_reset(struct reset_ctl *reset_ctl, bool on)
- {
- struct sunxi_reset_priv *priv = dev_get_priv(reset_ctl->dev);
- const struct ccu_reset *reset = priv_to_reset(priv, reset_ctl->id);
- u32 reg;
- if (!(reset->flags & CCU_RST_F_IS_VALID)) {
- printf("%s: (RST#%ld) unhandled\n", __func__, reset_ctl->id);
- return 0;
- }
- debug("%s: (RST#%ld) off#0x%x, BIT(%d)\n", __func__,
- reset_ctl->id, reset->off, ilog2(reset->bit));
- reg = readl(priv->base + reset->off);
- if (on)
- reg |= reset->bit;
- else
- reg &= ~reset->bit;
- writel(reg, priv->base + reset->off);
- return 0;
- }
- static int sunxi_reset_assert(struct reset_ctl *reset_ctl)
- {
- return sunxi_set_reset(reset_ctl, false);
- }
- static int sunxi_reset_deassert(struct reset_ctl *reset_ctl)
- {
- return sunxi_set_reset(reset_ctl, true);
- }
- struct reset_ops sunxi_reset_ops = {
- .request = sunxi_reset_request,
- .rfree = sunxi_reset_free,
- .rst_assert = sunxi_reset_assert,
- .rst_deassert = sunxi_reset_deassert,
- };
- static int sunxi_reset_probe(struct udevice *dev)
- {
- struct sunxi_reset_priv *priv = dev_get_priv(dev);
- priv->base = dev_read_addr_ptr(dev);
- return 0;
- }
- int sunxi_reset_bind(struct udevice *dev, ulong count)
- {
- struct udevice *rst_dev;
- struct sunxi_reset_priv *priv;
- int ret;
- ret = device_bind_driver_to_node(dev, "sunxi_reset", "reset",
- dev_ofnode(dev), &rst_dev);
- if (ret) {
- debug("failed to bind sunxi_reset driver (ret=%d)\n", ret);
- return ret;
- }
- priv = malloc(sizeof(struct sunxi_reset_priv));
- priv->count = count;
- priv->desc = (const struct ccu_desc *)dev_get_driver_data(dev);
- rst_dev->priv = priv;
- return 0;
- }
- U_BOOT_DRIVER(sunxi_reset) = {
- .name = "sunxi_reset",
- .id = UCLASS_RESET,
- .ops = &sunxi_reset_ops,
- .probe = sunxi_reset_probe,
- .priv_auto_alloc_size = sizeof(struct sunxi_reset_priv),
- };
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