It adds a Driver Model compatible reset driver for HiSlicon platform. The driver implements a custom .of_xlate function, and uses .data field as reset register offset and .id field as bit shift.
Signed-off-by: Shawn Guo shawn.guo@linaro.org Reviewed-by: Igor Opaniuk igor.opaniuk@linaro.org --- drivers/reset/Kconfig | 6 +++ drivers/reset/Makefile | 1 + drivers/reset/reset-hisilicon.c | 95 +++++++++++++++++++++++++++++++++ 3 files changed, 102 insertions(+) create mode 100644 drivers/reset/reset-hisilicon.c
diff --git a/drivers/reset/Kconfig b/drivers/reset/Kconfig index a81e76769604..6ec6f39c85f0 100644 --- a/drivers/reset/Kconfig +++ b/drivers/reset/Kconfig @@ -121,4 +121,10 @@ config RESET_SUNXI This enables support for common reset driver for Allwinner SoCs.
+config RESET_HISILICON + bool "Reset controller driver for HiSilicon SoCs" + depends on DM_RESET + help + Support for reset controller on HiSilicon SoCs. + endmenu diff --git a/drivers/reset/Makefile b/drivers/reset/Makefile index 4fad7d412985..7fec75bb4923 100644 --- a/drivers/reset/Makefile +++ b/drivers/reset/Makefile @@ -19,3 +19,4 @@ obj-$(CONFIG_RESET_MESON) += reset-meson.o obj-$(CONFIG_RESET_SOCFPGA) += reset-socfpga.o obj-$(CONFIG_RESET_MEDIATEK) += reset-mediatek.o obj-$(CONFIG_RESET_SUNXI) += reset-sunxi.o +obj-$(CONFIG_RESET_HISILICON) += reset-hisilicon.o diff --git a/drivers/reset/reset-hisilicon.c b/drivers/reset/reset-hisilicon.c new file mode 100644 index 000000000000..3a06110f76f3 --- /dev/null +++ b/drivers/reset/reset-hisilicon.c @@ -0,0 +1,95 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * Copyright (c) 2019, Linaro Limited + */ + +#include <asm/io.h> +#include <common.h> +#include <dm.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); + 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); + 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 != 2) { + debug("Invalid args_count: %d\n", args->args_count); + return -EINVAL; + } + + /* We use .data field as register offset and .id field as bit shift. */ + rst->data = args->args[0]; + rst->id = args->args[1]; + + return 0; +} + +static const struct reset_ops hisi_reset_reset_ops = { + .of_xlate = hisi_reset_of_xlate, + .request = hisi_reset_request, + .free = hisi_reset_free, + .rst_assert = hisi_reset_assert, + .rst_deassert = hisi_reset_deassert, +}; + +static const struct udevice_id hisi_reset_ids[] = { + { .compatible = "hisilicon,hi3798cv200-crg" }, + { } +}; + +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), +};