diff options
Diffstat (limited to 'drivers/reset')
| -rw-r--r-- | drivers/reset/Kconfig | 7 | ||||
| -rw-r--r-- | drivers/reset/Makefile | 1 | ||||
| -rw-r--r-- | drivers/reset/reset-socfpga.c | 105 | ||||
| -rw-r--r-- | drivers/reset/reset-uclass.c | 4 |
4 files changed, 115 insertions, 2 deletions
diff --git a/drivers/reset/Kconfig b/drivers/reset/Kconfig index ccfdac7823..33c39b7fb6 100644 --- a/drivers/reset/Kconfig +++ b/drivers/reset/Kconfig @@ -91,4 +91,11 @@ config RESET_MESON help Support for reset controller on Amlogic Meson SoC. +config RESET_SOCFPGA + bool "Reset controller driver for SoCFPGA" + depends on DM_RESET && ARCH_SOCFPGA + default y + help + Support for reset controller on SoCFPGA platform. + endmenu diff --git a/drivers/reset/Makefile b/drivers/reset/Makefile index d1d5146825..ad08be4c8c 100644 --- a/drivers/reset/Makefile +++ b/drivers/reset/Makefile @@ -14,3 +14,4 @@ obj-$(CONFIG_RESET_UNIPHIER) += reset-uniphier.o obj-$(CONFIG_AST2500_RESET) += ast2500-reset.o obj-$(CONFIG_RESET_ROCKCHIP) += reset-rockchip.o obj-$(CONFIG_RESET_MESON) += reset-meson.o +obj-$(CONFIG_RESET_SOCFPGA) += reset-socfpga.o diff --git a/drivers/reset/reset-socfpga.c b/drivers/reset/reset-socfpga.c new file mode 100644 index 0000000000..466455d073 --- /dev/null +++ b/drivers/reset/reset-socfpga.c @@ -0,0 +1,105 @@ +/* + * Socfpga Reset Controller Driver + * + * Copyright 2014 Steffen Trumtrar <s.trumtrar@pengutronix.de> + * + * based on + * Allwinner SoCs Reset Controller driver + * + * Copyright 2013 Maxime Ripard + * + * Maxime Ripard <maxime.ripard@free-electrons.com> + * + * SPDX-License-Identifier: GPL-2.0+ + */ + +#include <common.h> +#include <dm.h> +#include <dm/of_access.h> +#include <reset-uclass.h> +#include <linux/bitops.h> +#include <linux/io.h> +#include <linux/sizes.h> + +#define BANK_INCREMENT 4 +#define NR_BANKS 8 + +struct socfpga_reset_data { + void __iomem *membase; +}; + +static int socfpga_reset_assert(struct reset_ctl *reset_ctl) +{ + struct socfpga_reset_data *data = dev_get_priv(reset_ctl->dev); + int id = reset_ctl->id; + int reg_width = sizeof(u32); + int bank = id / (reg_width * BITS_PER_BYTE); + int offset = id % (reg_width * BITS_PER_BYTE); + + setbits_le32(data->membase + (bank * BANK_INCREMENT), BIT(offset)); + return 0; +} + +static int socfpga_reset_deassert(struct reset_ctl *reset_ctl) +{ + struct socfpga_reset_data *data = dev_get_priv(reset_ctl->dev); + int id = reset_ctl->id; + int reg_width = sizeof(u32); + int bank = id / (reg_width * BITS_PER_BYTE); + int offset = id % (reg_width * BITS_PER_BYTE); + + clrbits_le32(data->membase + (bank * BANK_INCREMENT), BIT(offset)); + return 0; +} + +static int socfpga_reset_request(struct reset_ctl *reset_ctl) +{ + debug("%s(reset_ctl=%p) (dev=%p, id=%lu)\n", __func__, + reset_ctl, reset_ctl->dev, reset_ctl->id); + + return 0; +} + +static int socfpga_reset_free(struct reset_ctl *reset_ctl) +{ + debug("%s(reset_ctl=%p) (dev=%p, id=%lu)\n", __func__, reset_ctl, + reset_ctl->dev, reset_ctl->id); + + return 0; +} + +static const struct reset_ops socfpga_reset_ops = { + .request = socfpga_reset_request, + .free = socfpga_reset_free, + .rst_assert = socfpga_reset_assert, + .rst_deassert = socfpga_reset_deassert, +}; + +static int socfpga_reset_probe(struct udevice *dev) +{ + struct socfpga_reset_data *data = dev_get_priv(dev); + const void *blob = gd->fdt_blob; + int node = dev_of_offset(dev); + u32 modrst_offset; + + data->membase = devfdt_get_addr_ptr(dev); + + modrst_offset = fdtdec_get_int(blob, node, "altr,modrst-offset", 0x10); + data->membase += modrst_offset; + + return 0; +} + +static const struct udevice_id socfpga_reset_match[] = { + { .compatible = "altr,rst-mgr" }, + { /* sentinel */ }, +}; + +U_BOOT_DRIVER(socfpga_reset) = { + .name = "socfpga-reset", + .id = UCLASS_RESET, + .of_match = socfpga_reset_match, + .probe = socfpga_reset_probe, + .priv_auto_alloc_size = sizeof(struct socfpga_reset_data), + .ops = &socfpga_reset_ops, +}; diff --git a/drivers/reset/reset-uclass.c b/drivers/reset/reset-uclass.c index 9a5c9c91b9..fa4f6538ed 100644 --- a/drivers/reset/reset-uclass.c +++ b/drivers/reset/reset-uclass.c @@ -88,8 +88,8 @@ int reset_get_bulk(struct udevice *dev, struct reset_ctl_bulk *bulk) bulk->count = 0; count = dev_count_phandle_with_args(dev, "resets", "#reset-cells"); - if (!count) - return 0; + if (count < 1) + return count; bulk->resets = devm_kcalloc(dev, count, sizeof(struct reset_ctl), GFP_KERNEL); |