From 883a7a982a56b1e121f77b1d30ce880a0164d624 Mon Sep 17 00:00:00 2001 From: Jim Liu Date: Wed, 3 Jan 2024 15:29:33 +0800 Subject: [PATCH] reset: npcm: Add support for Nuvoton NPCM BMC family Add reset controller driver for Nuvoton BMCs. The npcm reset driver not only supports reset each module reset but setting initial value of reset Control Registers. And The driver support each module reset. Signed-off-by: Jim Liu --- drivers/reset/Kconfig | 7 ++ drivers/reset/Makefile | 1 + drivers/reset/reset-npcm.c | 145 +++++++++++++++++++++++++++++++++++++ 3 files changed, 153 insertions(+) create mode 100644 drivers/reset/reset-npcm.c diff --git a/drivers/reset/Kconfig b/drivers/reset/Kconfig index 88e04d93f2..fe5c1214f5 100644 --- a/drivers/reset/Kconfig +++ b/drivers/reset/Kconfig @@ -135,6 +135,13 @@ config RESET_MTMIPS help Support for reset controller on MediaTek MIPS platform. +config RESET_NPCM + bool "Reset controller driver for Nuvoton BMCs" + depends on DM_RESET && ARCH_NPCM + default y + help + Support for reset controller on Nuvotom BMCs. + config RESET_SUNXI bool "RESET support for Allwinner SoCs" depends on DM_RESET && ARCH_SUNXI diff --git a/drivers/reset/Makefile b/drivers/reset/Makefile index 7b0066f801..2eb639e4a6 100644 --- a/drivers/reset/Makefile +++ b/drivers/reset/Makefile @@ -21,6 +21,7 @@ obj-$(CONFIG_RESET_MESON) += reset-meson.o obj-$(CONFIG_RESET_SOCFPGA) += reset-socfpga.o obj-$(CONFIG_RESET_MEDIATEK) += reset-mediatek.o obj-$(CONFIG_RESET_MTMIPS) += reset-mtmips.o +obj-$(CONFIG_RESET_NPCM) += reset-npcm.o obj-$(CONFIG_RESET_SUNXI) += reset-sunxi.o obj-$(CONFIG_RESET_HISILICON) += reset-hisilicon.o obj-$(CONFIG_RESET_IMX7) += reset-imx7.o diff --git a/drivers/reset/reset-npcm.c b/drivers/reset/reset-npcm.c new file mode 100644 index 0000000000..a3b85a4225 --- /dev/null +++ b/drivers/reset/reset-npcm.c @@ -0,0 +1,145 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * Copyright 2023 Nuvoton Technology Corp. + */ + +#include +#include +#include +#include + +struct npcm_reset_priv { + void __iomem *base; +}; + +static int npcm_reset_request(struct reset_ctl *rst) +{ + return 0; +} + +static int npcm_reset_free(struct reset_ctl *rst) +{ + return 0; +} + +static int npcm_reset_assert(struct reset_ctl *rst) +{ + struct npcm_reset_priv *priv = dev_get_priv(rst->dev); + u32 val; + + debug("%s: id 0x%lx, data %ld\n", __func__, rst->id, rst->data); + val = readl(priv->base + rst->id); + val |= BIT(rst->data); + writel(val, priv->base + rst->id); + + return 0; +} + +static int npcm_reset_deassert(struct reset_ctl *rst) +{ + struct npcm_reset_priv *priv = dev_get_priv(rst->dev); + u32 val; + + debug("%s: id 0x%lx, data %ld\n", __func__, rst->id, rst->data); + val = readl(priv->base + rst->id); + val &= ~BIT(rst->data); + writel(val, priv->base + rst->id); + + return 0; +} + +static int npcm_reset_xlate(struct reset_ctl *rst, + struct ofnode_phandle_args *args) +{ + if (args->args_count != 2) { + dev_err(rst->dev, "Invalid args_count: %d\n", args->args_count); + return -EINVAL; + } + + /* Use id field as register offset and data field as reset bit positiion */ + rst->id = args->args[0]; + rst->data = args->args[1]; + + return 0; +} + +static int npcm_reset_probe(struct udevice *dev) +{ + struct npcm_reset_priv *priv = dev_get_priv(dev); + + priv->base = dev_remap_addr(dev); + if (!priv->base) + return -EINVAL; + + return 0; +} + +static int npcm_reset_bind(struct udevice *dev) +{ + void __iomem *reg_base; + u32 *rcr_values; + int num_fields; + u32 reg, val; + int ret, i; + + reg_base = dev_remap_addr(dev); + if (!reg_base) + return -EINVAL; + + /* + * Set RCR initial value + * The rcr-initial-values cell is + */ + num_fields = dev_read_size(dev, "rcr-initial-values"); + if (num_fields < 2) + return 0; + + num_fields /= sizeof(u32); + if (num_fields % 2) + return -EINVAL; + + num_fields = num_fields / 2; + rcr_values = malloc(num_fields * 2 * sizeof(u32)); + if (!rcr_values) + return -ENOMEM; + + ret = dev_read_u32_array(dev, "rcr-initial-values", rcr_values, + num_fields * 2); + if (ret < 0) { + free(rcr_values); + return -EINVAL; + } + + for (i = 0; i < num_fields; i++) { + reg = rcr_values[2 * i]; + val = rcr_values[2 * i + 1]; + writel(val, reg_base + reg); + } + free(rcr_values); + + return 0; +} + +static const struct udevice_id npcm_reset_ids[] = { + { .compatible = "nuvoton,npcm845-reset" }, + { .compatible = "nuvoton,npcm750-reset" }, + { } +}; + +struct reset_ops npcm_reset_ops = { + .request = npcm_reset_request, + .rfree = npcm_reset_free, + .rst_assert = npcm_reset_assert, + .rst_deassert = npcm_reset_deassert, + .of_xlate = npcm_reset_xlate, +}; + +U_BOOT_DRIVER(npcm_reset) = { + .name = "npcm_reset", + .id = UCLASS_RESET, + .of_match = npcm_reset_ids, + .bind = npcm_reset_bind, + .probe = npcm_reset_probe, + .ops = &npcm_reset_ops, + .priv_auto = sizeof(struct npcm_reset_priv), +}; -- 2.39.5