123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869707172737475767778798081828384858687888990919293949596979899100101102103 |
- // SPDX-License-Identifier: GPL-2.0
- /*
- * Copyright (c) 2019, Linaro Limited
- */
- #include <asm/io.h>
- #include <common.h>
- #include <dm.h>
- #include <dt-bindings/reset/ti-syscon.h>
- #include <reset-uclass.h>
- struct hisi_reset_priv {
- void __iomem *base;
- };
- static int hisi_reset_deassert(struct reset_ctl *rst)
- {
- struct hisi_reset_priv *priv = dev_get_priv(rst->dev);
- u32 val;
- val = readl(priv->base + rst->data);
- if (rst->polarity & DEASSERT_SET)
- val |= BIT(rst->id);
- else
- val &= ~BIT(rst->id);
- writel(val, priv->base + rst->data);
- return 0;
- }
- static int hisi_reset_assert(struct reset_ctl *rst)
- {
- struct hisi_reset_priv *priv = dev_get_priv(rst->dev);
- u32 val;
- val = readl(priv->base + rst->data);
- if (rst->polarity & ASSERT_SET)
- val |= BIT(rst->id);
- else
- val &= ~BIT(rst->id);
- writel(val, priv->base + rst->data);
- return 0;
- }
- static int hisi_reset_free(struct reset_ctl *rst)
- {
- return 0;
- }
- static int hisi_reset_request(struct reset_ctl *rst)
- {
- return 0;
- }
- static int hisi_reset_of_xlate(struct reset_ctl *rst,
- struct ofnode_phandle_args *args)
- {
- if (args->args_count != 3) {
- debug("Invalid args_count: %d\n", args->args_count);
- return -EINVAL;
- }
- /* Use .data field as register offset and .id field as bit shift */
- rst->data = args->args[0];
- rst->id = args->args[1];
- rst->polarity = args->args[2];
- return 0;
- }
- static const struct reset_ops hisi_reset_reset_ops = {
- .of_xlate = hisi_reset_of_xlate,
- .request = hisi_reset_request,
- .rfree = hisi_reset_free,
- .rst_assert = hisi_reset_assert,
- .rst_deassert = hisi_reset_deassert,
- };
- static const struct udevice_id hisi_reset_ids[] = {
- { .compatible = "hisilicon,hi3798cv200-reset" },
- { }
- };
- static int hisi_reset_probe(struct udevice *dev)
- {
- struct hisi_reset_priv *priv = dev_get_priv(dev);
- priv->base = dev_remap_addr(dev);
- if (!priv->base)
- return -ENOMEM;
- return 0;
- }
- U_BOOT_DRIVER(hisi_reset) = {
- .name = "hisilicon_reset",
- .id = UCLASS_RESET,
- .of_match = hisi_reset_ids,
- .ops = &hisi_reset_reset_ops,
- .probe = hisi_reset_probe,
- .priv_auto_alloc_size = sizeof(struct hisi_reset_priv),
- };
|