diff options
Diffstat (limited to 'drivers/reset')
| -rw-r--r-- | drivers/reset/Kconfig | 9 | ||||
| -rw-r--r-- | drivers/reset/Makefile | 1 | ||||
| -rw-r--r-- | drivers/reset/reset-sifive.c | 118 |
3 files changed, 128 insertions, 0 deletions
diff --git a/drivers/reset/Kconfig b/drivers/reset/Kconfig index 6d53561223..253902ff57 100644 --- a/drivers/reset/Kconfig +++ b/drivers/reset/Kconfig @@ -148,6 +148,15 @@ config RESET_IMX7 help Support for reset controller on i.MX7/8 SoCs. +config RESET_SIFIVE + bool "Reset Driver for SiFive SoC's" + depends on DM_RESET && CLK_SIFIVE_FU540_PRCI && TARGET_SIFIVE_FU540 + default y + help + PRCI module within SiFive SoC's provides mechanism to reset + different hw blocks like DDR, gemgxl. With this driver we leverage + U-Boot's reset framework to reset these hardware blocks. + config RESET_SYSCON bool "Enable generic syscon reset driver support" depends on DM_RESET diff --git a/drivers/reset/Makefile b/drivers/reset/Makefile index 8e0124b8de..3c7f066ae3 100644 --- a/drivers/reset/Makefile +++ b/drivers/reset/Makefile @@ -23,5 +23,6 @@ obj-$(CONFIG_RESET_MTMIPS) += reset-mtmips.o obj-$(CONFIG_RESET_SUNXI) += reset-sunxi.o obj-$(CONFIG_RESET_HISILICON) += reset-hisilicon.o obj-$(CONFIG_RESET_IMX7) += reset-imx7.o +obj-$(CONFIG_RESET_SIFIVE) += reset-sifive.o obj-$(CONFIG_RESET_SYSCON) += reset-syscon.o obj-$(CONFIG_RESET_RASPBERRYPI) += reset-raspberrypi.o diff --git a/drivers/reset/reset-sifive.c b/drivers/reset/reset-sifive.c new file mode 100644 index 0000000000..527757f853 --- /dev/null +++ b/drivers/reset/reset-sifive.c @@ -0,0 +1,118 @@ +// SPDX-License-Identifier: GPL-2.0+ +/* + * Copyright (C) 2020 Sifive, Inc. + * Author: Sagar Kadam <sagar.kadam@sifive.com> + */ + +#include <common.h> +#include <dm.h> +#include <reset-uclass.h> +#include <asm/io.h> +#include <dm/device_compat.h> +#include <dm/lists.h> +#include <linux/bitops.h> + +#define PRCI_RESETREG_OFFSET 0x28 + +struct sifive_reset_priv { + void *base; + /* number of reset signals */ + int nr_reset; +}; + +static int sifive_rst_trigger(struct reset_ctl *rst, bool level) +{ + struct sifive_reset_priv *priv = dev_get_priv(rst->dev); + int id = rst->id; + int regval = readl(priv->base + PRCI_RESETREG_OFFSET); + + /* Derive bitposition from rst id */ + if (level) + /* Reset deassert */ + regval |= BIT(id); + else + /* Reset assert */ + regval &= ~BIT(id); + + writel(regval, priv->base + PRCI_RESETREG_OFFSET); + + return 0; +} + +static int sifive_reset_assert(struct reset_ctl *rst) +{ + return sifive_rst_trigger(rst, false); +} + +static int sifive_reset_deassert(struct reset_ctl *rst) +{ + return sifive_rst_trigger(rst, true); +} + +static int sifive_reset_request(struct reset_ctl *rst) +{ + struct sifive_reset_priv *priv = dev_get_priv(rst->dev); + + debug("%s(rst=%p) (dev=%p, id=%lu) (nr_reset=%d)\n", __func__, + rst, rst->dev, rst->id, priv->nr_reset); + + if (rst->id > priv->nr_reset) + return -EINVAL; + + return 0; +} + +static int sifive_reset_free(struct reset_ctl *rst) +{ + struct sifive_reset_priv *priv = dev_get_priv(rst->dev); + + debug("%s(rst=%p) (dev=%p, id=%lu) (nr_reset=%d)\n", __func__, + rst, rst->dev, rst->id, priv->nr_reset); + + return 0; +} + +static int sifive_reset_probe(struct udevice *dev) +{ + struct sifive_reset_priv *priv = dev_get_priv(dev); + + priv->base = dev_remap_addr(dev); + if (!priv->base) + return -ENOMEM; + + return 0; +} + +int sifive_reset_bind(struct udevice *dev, ulong count) +{ + struct udevice *rst_dev; + struct sifive_reset_priv *priv; + int ret; + + ret = device_bind_driver_to_node(dev, "sifive-reset", "reset", + dev_ofnode(dev), &rst_dev); + if (ret) { + dev_err(dev, "failed to bind sifive_reset driver (ret=%d)\n", ret); + return ret; + } + priv = malloc(sizeof(struct sifive_reset_priv)); + priv->nr_reset = count; + rst_dev->priv = priv; + + return 0; +} + +const struct reset_ops sifive_reset_ops = { + .request = sifive_reset_request, + .rfree = sifive_reset_free, + .rst_assert = sifive_reset_assert, + .rst_deassert = sifive_reset_deassert, +}; + +U_BOOT_DRIVER(sifive_reset) = { + .name = "sifive-reset", + .id = UCLASS_RESET, + .ops = &sifive_reset_ops, + .probe = sifive_reset_probe, + .priv_auto_alloc_size = sizeof(struct sifive_reset_priv), +}; |