diff options
Diffstat (limited to 'drivers/reset')
| -rw-r--r-- | drivers/reset/Kconfig | 8 | ||||
| -rw-r--r-- | drivers/reset/Makefile | 1 | ||||
| -rw-r--r-- | drivers/reset/reset-sunxi.c | 124 |
3 files changed, 133 insertions, 0 deletions
diff --git a/drivers/reset/Kconfig b/drivers/reset/Kconfig index 3a6d61f440..a81e767696 100644 --- a/drivers/reset/Kconfig +++ b/drivers/reset/Kconfig @@ -113,4 +113,12 @@ config RESET_MEDIATEK help Support for reset controller on MediaTek SoCs. +config RESET_SUNXI + bool "RESET support for Allwinner SoCs" + depends on DM_RESET && ARCH_SUNXI + default y + help + This enables support for common reset driver for + Allwinner SoCs. + endmenu diff --git a/drivers/reset/Makefile b/drivers/reset/Makefile index 8a4dcab8f6..4fad7d4129 100644 --- a/drivers/reset/Makefile +++ b/drivers/reset/Makefile @@ -18,3 +18,4 @@ obj-$(CONFIG_RESET_ROCKCHIP) += reset-rockchip.o obj-$(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 diff --git a/drivers/reset/reset-sunxi.c b/drivers/reset/reset-sunxi.c new file mode 100644 index 0000000000..364dc52fb7 --- /dev/null +++ b/drivers/reset/reset-sunxi.c @@ -0,0 +1,124 @@ +// 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, + .free = 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), +}; |