Add reset driver for hi6220-hikey board,this driver supply deassert of IP. on hi6220 SoC. Signed-off-by: Chen Feng <puck.chen@xxxxxxxxxxxxx> --- drivers/reset/Kconfig | 1 + drivers/reset/Makefile | 1 + drivers/reset/hisilicon/Kconfig | 5 +++ drivers/reset/hisilicon/Makefile | 1 + drivers/reset/hisilicon/hi6220_reset.c | 74 ++++++++++++++++++++++++++++++++++ 5 files changed, 82 insertions(+) create mode 100644 drivers/reset/hisilicon/Kconfig create mode 100644 drivers/reset/hisilicon/Makefile create mode 100644 drivers/reset/hisilicon/hi6220_reset.c diff --git a/drivers/reset/Kconfig b/drivers/reset/Kconfig index 0615f50..df37212 100644 --- a/drivers/reset/Kconfig +++ b/drivers/reset/Kconfig @@ -13,3 +13,4 @@ menuconfig RESET_CONTROLLER If unsure, say no. source "drivers/reset/sti/Kconfig" +source "drivers/reset/hisilicon/Kconfig" diff --git a/drivers/reset/Makefile b/drivers/reset/Makefile index 157d421..331d7b2 100644 --- a/drivers/reset/Makefile +++ b/drivers/reset/Makefile @@ -3,3 +3,4 @@ obj-$(CONFIG_ARCH_SOCFPGA) += reset-socfpga.o obj-$(CONFIG_ARCH_BERLIN) += reset-berlin.o obj-$(CONFIG_ARCH_SUNXI) += reset-sunxi.o obj-$(CONFIG_ARCH_STI) += sti/ +obj-$(CONFIG_ARCH_HISI) += hisilicon/ diff --git a/drivers/reset/hisilicon/Kconfig b/drivers/reset/hisilicon/Kconfig new file mode 100644 index 0000000..bceed14 --- /dev/null +++ b/drivers/reset/hisilicon/Kconfig @@ -0,0 +1,5 @@ +config COMMON_RESET_HI6220 + tristate "Hi6220 Clock Driver" + depends on (ARCH_HISI && RESET_CONTROLLER) + help + Build the Hisilicon Hi6220 reset driver. diff --git a/drivers/reset/hisilicon/Makefile b/drivers/reset/hisilicon/Makefile new file mode 100644 index 0000000..c932f86 --- /dev/null +++ b/drivers/reset/hisilicon/Makefile @@ -0,0 +1 @@ +obj-$(CONFIG_COMMON_RESET_HI6220) += hi6220_reset.o diff --git a/drivers/reset/hisilicon/hi6220_reset.c b/drivers/reset/hisilicon/hi6220_reset.c new file mode 100644 index 0000000..a88fc57 --- /dev/null +++ b/drivers/reset/hisilicon/hi6220_reset.c @@ -0,0 +1,74 @@ +/* + * Hisilicon Hi6220 reset controller driver + * + * Copyright (c) 2015 Hisilicon Limited. + * + * Author: Feng Chen <puck.chen@xxxxxxxxxxxxx> + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License version 2 as + * published by the Free Software Foundation. + */ + +#include <linux/init.h> +#include <linux/bitops.h> +#include <linux/io.h> +#include <linux/of.h> +#include <linux/of_address.h> +#include <linux/reset-controller.h> +#include <linux/reset.h> + +static void __iomem *src_base; +static DEFINE_SPINLOCK(reset_lock); + +static int hi6220_reset_module(struct reset_controller_dev *rc_dev, + unsigned long idx) +{ + unsigned long timeout; + unsigned long flags; + int bit; + u32 val; + + int bank = idx >> 8; + int offset = idx & 0xff; + + spin_lock_irqsave(&reset_lock, flags); + + val = readl(src_base + (bank * 0x10)); + writel(val | BIT(offset), src_base + (bank * 0x10)); + + spin_unlock_irqrestore(&reset_lock, flags); + + return 0; + +} + +static struct reset_control_ops hi6220_reset_ops = { + .deassert = hi6220_reset_module, +}; + +static struct reset_controller_dev hi6220_reset_dev = { + .ops = &hi6220_reset_ops, + .nr_resets = 0xffff, +}; + +static void __init hi6220_reset_init(void) +{ + struct device_node *np; + struct reset_control *test = NULL; + + np = of_find_compatible_node(NULL, NULL, "hisilicon,hisi_reset_ctl"); + if (!np) { + pr_err("find reset node in dts error!\n"); + return; + } + src_base = of_iomap(np, 0); + WARN_ON(!src_base); + + hi6220_reset_dev.of_node = np; + if (IS_ENABLED(CONFIG_RESET_CONTROLLER)) + reset_controller_register(&hi6220_reset_dev); +} + +postcore_initcall(hi6220_reset_init); + -- 1.9.1 -- To unsubscribe from this list: send the line "unsubscribe devicetree" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html