diff options
author | Markus Mayer <markus.mayer@linaro.org> | 2013-06-24 15:39:33 -0700 |
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committer | Christian Daudt <csd@broadcom.com> | 2013-08-08 15:19:19 -0700 |
commit | 257b49e3d8cd2b8e5a67c566e6db40a52f6185c0 (patch) | |
tree | b01a8204ffd734944c396d1372d10ee590d9c6de /arch/arm/mach-bcm | |
parent | 6dea0df2e79850bb30f83b9e7f975a8470ca6e92 (diff) | |
download | op-kernel-dev-257b49e3d8cd2b8e5a67c566e6db40a52f6185c0.zip op-kernel-dev-257b49e3d8cd2b8e5a67c566e6db40a52f6185c0.tar.gz |
ARM: bcm281xx: Board specific reboot code
This patch adds the code needed to trigger a reboot on the bcm281xx
family.
Signed-off-by: Markus Mayer <markus.mayer@linaro.org>
Reviewed-by: Tim Kryger <tim.kryger@linaro.org>
Reviewed-by: Matt Porter <matt.porter@linaro.org>
Reviewed-by: Alex Elder <alex.elder@linaro.org>
Acked-by: Christian Daudt <csd@broadcom.com>
Diffstat (limited to 'arch/arm/mach-bcm')
-rw-r--r-- | arch/arm/mach-bcm/Makefile | 4 | ||||
-rw-r--r-- | arch/arm/mach-bcm/board_bcm.c | 20 | ||||
-rw-r--r-- | arch/arm/mach-bcm/kona.c | 65 | ||||
-rw-r--r-- | arch/arm/mach-bcm/kona.h | 17 |
4 files changed, 101 insertions, 5 deletions
diff --git a/arch/arm/mach-bcm/Makefile b/arch/arm/mach-bcm/Makefile index 6adb6aec..7e5ca0a 100644 --- a/arch/arm/mach-bcm/Makefile +++ b/arch/arm/mach-bcm/Makefile @@ -1,5 +1,5 @@ # -# Copyright (C) 2012 Broadcom Corporation +# Copyright (C) 2012-2013 Broadcom Corporation # # This program is free software; you can redistribute it and/or # modify it under the terms of the GNU General Public License as @@ -10,6 +10,6 @@ # of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the # GNU General Public License for more details. -obj-$(CONFIG_ARCH_BCM) := board_bcm.o bcm_kona_smc.o bcm_kona_smc_asm.o +obj-$(CONFIG_ARCH_BCM) := board_bcm.o bcm_kona_smc.o bcm_kona_smc_asm.o kona.o plus_sec := $(call as-instr,.arch_extension sec,+sec) AFLAGS_bcm_kona_smc_asm.o :=-Wa,-march=armv7-a$(plus_sec) diff --git a/arch/arm/mach-bcm/board_bcm.c b/arch/arm/mach-bcm/board_bcm.c index 2859932..1e49ec0 100644 --- a/arch/arm/mach-bcm/board_bcm.c +++ b/arch/arm/mach-bcm/board_bcm.c @@ -1,5 +1,5 @@ /* - * Copyright (C) 2012 Broadcom Corporation + * Copyright (C) 2012-2013 Broadcom Corporation * * This program is free software; you can redistribute it and/or * modify it under the terms of the GNU General Public License as @@ -21,8 +21,8 @@ #include <asm/mach/time.h> #include <asm/hardware/cache-l2x0.h> - #include "bcm_kona_smc.h" +#include "kona.h" static int __init kona_l2_cache_init(void) { @@ -40,13 +40,26 @@ static int __init kona_l2_cache_init(void) return 0; } +static void bcm_board_setup_restart(void) +{ + struct device_node *np; + + np = of_find_compatible_node(NULL, NULL, "bcm,bcm11351"); + if (np) { + if (of_device_is_available(np)) + bcm_kona_setup_restart(); + of_node_put(np); + } + /* Restart setup for other boards goes here */ +} + static void __init board_init(void) { of_platform_populate(NULL, of_default_bus_match_table, NULL, &platform_bus); bcm_kona_smc_init(); - + bcm_board_setup_restart(); kona_l2_cache_init(); } @@ -55,5 +68,6 @@ static const char * const bcm11351_dt_compat[] = { "bcm,bcm11351", NULL, }; DT_MACHINE_START(BCM11351_DT, "Broadcom Application Processor") .init_time = clocksource_of_init, .init_machine = board_init, + .restart = bcm_kona_restart, .dt_compat = bcm11351_dt_compat, MACHINE_END diff --git a/arch/arm/mach-bcm/kona.c b/arch/arm/mach-bcm/kona.c new file mode 100644 index 0000000..6939d90 --- /dev/null +++ b/arch/arm/mach-bcm/kona.c @@ -0,0 +1,65 @@ +/* + * Copyright (C) 2013 Broadcom Corporation + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of the GNU General Public License as + * published by the Free Software Foundation version 2. + * + * This program is distributed "as is" WITHOUT ANY WARRANTY of any + * kind, whether express or implied; without even the implied warranty + * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + */ + +#include <linux/of_address.h> +#include <asm/io.h> + +#include "kona.h" + +static void __iomem *watchdog_base; + +void bcm_kona_setup_restart(void) +{ + struct device_node *np_wdog; + + /* + * The assumption is that whoever calls bcm_kona_setup_restart() + * also needs a Kona Watchdog Timer entry in Device Tree, i.e. we + * report an error if the DT entry is missing. + */ + np_wdog = of_find_compatible_node(NULL, NULL, "brcm,kona-wdt"); + if (!np_wdog) { + pr_err("brcm,kona-wdt not found in DT, reboot disabled\n"); + return; + } + watchdog_base = of_iomap(np_wdog, 0); + WARN(!watchdog_base, "failed to map watchdog base"); + of_node_put(np_wdog); +} + +#define SECWDOG_OFFSET 0x00000000 +#define SECWDOG_RESERVED_MASK 0xE2000000 +#define SECWDOG_WD_LOAD_FLAG_MASK 0x10000000 +#define SECWDOG_EN_MASK 0x08000000 +#define SECWDOG_SRSTEN_MASK 0x04000000 +#define SECWDOG_CLKS_SHIFT 20 +#define SECWDOG_LOCK_SHIFT 0 + +void bcm_kona_restart(enum reboot_mode mode, const char *cmd) +{ + uint32_t val; + + if (!watchdog_base) + panic("Watchdog not mapped. Reboot failed.\n"); + + /* Enable watchdog2 with very short timeout. */ + val = readl(watchdog_base + SECWDOG_OFFSET); + val &= SECWDOG_RESERVED_MASK | SECWDOG_WD_LOAD_FLAG_MASK; + val |= SECWDOG_EN_MASK | SECWDOG_SRSTEN_MASK | + (0x8 << SECWDOG_CLKS_SHIFT) | + (0x8 << SECWDOG_LOCK_SHIFT); + writel(val, watchdog_base + SECWDOG_OFFSET); + + while (1) + ; +} diff --git a/arch/arm/mach-bcm/kona.h b/arch/arm/mach-bcm/kona.h new file mode 100644 index 0000000..291eca3 --- /dev/null +++ b/arch/arm/mach-bcm/kona.h @@ -0,0 +1,17 @@ +/* + * Copyright (C) 2013 Broadcom Corporation + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of the GNU General Public License as + * published by the Free Software Foundation version 2. + * + * This program is distributed "as is" WITHOUT ANY WARRANTY of any + * kind, whether express or implied; without even the implied warranty + * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + */ + +#include <linux/reboot.h> + +void bcm_kona_setup_restart(void); +void bcm_kona_restart(enum reboot_mode mode, const char *cmd); |