From 18393f70f6854e80d34b3b12d3a9eca84bae0a45 Mon Sep 17 00:00:00 2001 From: =?UTF-8?q?=C3=81lvaro=20Fern=C3=A1ndez=20Rojas?= Date: Wed, 3 May 2017 15:10:21 +0200 Subject: dm: reset: add BCM6345 reset driver MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit This is a simplified version of linux/arch/mips/bcm63xx/reset.c Signed-off-by: Álvaro Fernández Rojas Reviewed-by: Simon Glass --- drivers/reset/Kconfig | 6 +++ drivers/reset/Makefile | 1 + drivers/reset/reset-bcm6345.c | 89 +++++++++++++++++++++++++++++++++++++++++++ 3 files changed, 96 insertions(+) create mode 100644 drivers/reset/reset-bcm6345.c (limited to 'drivers/reset') diff --git a/drivers/reset/Kconfig b/drivers/reset/Kconfig index 80f4646a79..e6af7da8fe 100644 --- a/drivers/reset/Kconfig +++ b/drivers/reset/Kconfig @@ -42,6 +42,12 @@ config TEGRA186_RESET Enable support for manipulating Tegra's on-SoC reset signals via IPC requests to the BPMP (Boot and Power Management Processor). +config RESET_BCM6345 + bool "Reset controller driver for BCM6345" + depends on DM_RESET && ARCH_BMIPS + help + Support reset controller on BCM6345. + config RESET_UNIPHIER bool "Reset controller driver for UniPhier SoCs" depends on ARCH_UNIPHIER diff --git a/drivers/reset/Makefile b/drivers/reset/Makefile index 630b4b4e54..d5e06c2241 100644 --- a/drivers/reset/Makefile +++ b/drivers/reset/Makefile @@ -8,5 +8,6 @@ obj-$(CONFIG_SANDBOX_MBOX) += sandbox-reset-test.o obj-$(CONFIG_STI_RESET) += sti-reset.o obj-$(CONFIG_TEGRA_CAR_RESET) += tegra-car-reset.o obj-$(CONFIG_TEGRA186_RESET) += tegra186-reset.o +obj-$(CONFIG_RESET_BCM6345) += reset-bcm6345.o obj-$(CONFIG_RESET_UNIPHIER) += reset-uniphier.o obj-$(CONFIG_AST2500_RESET) += ast2500-reset.o diff --git a/drivers/reset/reset-bcm6345.c b/drivers/reset/reset-bcm6345.c new file mode 100644 index 0000000000..774c2a7538 --- /dev/null +++ b/drivers/reset/reset-bcm6345.c @@ -0,0 +1,89 @@ +/* + * Copyright (C) 2017 Álvaro Fernández Rojas + * + * Derived from linux/arch/mips/bcm63xx/reset.c: + * Copyright (C) 2012 Jonas Gorski + * + * SPDX-License-Identifier: GPL-2.0+ + */ + +#include +#include +#include +#include +#include + +#define MAX_RESETS 32 + +struct bcm6345_reset_priv { + void __iomem *regs; +}; + +static int bcm6345_reset_assert(struct reset_ctl *rst) +{ + struct bcm6345_reset_priv *priv = dev_get_priv(rst->dev); + + clrbits_be32(priv->regs, BIT(rst->id)); + mdelay(20); + + return 0; +} + +static int bcm6345_reset_deassert(struct reset_ctl *rst) +{ + struct bcm6345_reset_priv *priv = dev_get_priv(rst->dev); + + setbits_be32(priv->regs, BIT(rst->id)); + mdelay(20); + + return 0; +} + +static int bcm6345_reset_free(struct reset_ctl *rst) +{ + return 0; +} + +static int bcm6345_reset_request(struct reset_ctl *rst) +{ + if (rst->id >= MAX_RESETS) + return -EINVAL; + + return bcm6345_reset_assert(rst); +} + +struct reset_ops bcm6345_reset_reset_ops = { + .free = bcm6345_reset_free, + .request = bcm6345_reset_request, + .rst_assert = bcm6345_reset_assert, + .rst_deassert = bcm6345_reset_deassert, +}; + +static const struct udevice_id bcm6345_reset_ids[] = { + { .compatible = "brcm,bcm6345-reset" }, + { /* sentinel */ } +}; + +static int bcm6345_reset_probe(struct udevice *dev) +{ + struct bcm6345_reset_priv *priv = dev_get_priv(dev); + fdt_addr_t addr; + fdt_size_t size; + + addr = dev_get_addr_size_index(dev, 0, &size); + if (addr == FDT_ADDR_T_NONE) + return -EINVAL; + + priv->regs = ioremap(addr, size); + + return 0; +} + +U_BOOT_DRIVER(bcm6345_reset) = { + .name = "bcm6345-reset", + .id = UCLASS_RESET, + .of_match = bcm6345_reset_ids, + .ops = &bcm6345_reset_reset_ops, + .probe = bcm6345_reset_probe, + .priv_auto_alloc_size = sizeof(struct bcm6345_reset_priv), +}; -- cgit v1.2.3