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Sverdlin" To: linux-omap@vger.kernel.org Cc: Alexander Sverdlin , Paul Walmsley , Tony Lindgren , Russell King , linux-arm-kernel@lists.infradead.org, Matthias Michel Subject: [PATCH 2/2] ARM: AM33xx: PRM: Implement REBOOT_COLD Date: Wed, 21 Feb 2024 16:45:51 +0100 Message-ID: <20240221154614.3549951-2-alexander.sverdlin@siemens.com> In-Reply-To: <20240221154614.3549951-1-alexander.sverdlin@siemens.com> References: <20240221154614.3549951-1-alexander.sverdlin@siemens.com> Precedence: bulk X-Mailing-List: linux-omap@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Flowmailer-Platform: Siemens Feedback-ID: 519:519-456497:519-21489:flowmailer From: Alexander Sverdlin Historically AM33xx performed warm software reset even though requested (and default) was REBOOT_COLD. Reflect the de-facto default mode in /sys/kernel/reboot/mode correctly and implement the real REBOOT_COLD (if configured explicitly). Tested-by: Matthias Michel Signed-off-by: Alexander Sverdlin --- arch/arm/mach-omap2/am33xx-restart.c | 3 ++- arch/arm/mach-omap2/board-generic.c | 6 ++++++ arch/arm/mach-omap2/prm-regbits-33xx.h | 1 + arch/arm/mach-omap2/prm.h | 1 + arch/arm/mach-omap2/prm33xx.c | 18 ++++++++++++++---- arch/arm/mach-omap2/prm_common.c | 6 ++++++ 6 files changed, 30 insertions(+), 5 deletions(-) diff --git a/arch/arm/mach-omap2/am33xx-restart.c b/arch/arm/mach-omap2/am33xx-restart.c index ef2f18a56b658..199845f4b12e4 100644 --- a/arch/arm/mach-omap2/am33xx-restart.c +++ b/arch/arm/mach-omap2/am33xx-restart.c @@ -18,7 +18,8 @@ */ void am33xx_restart(enum reboot_mode mode, const char *cmd) { - /* TODO: Handle mode and cmd if necessary */ + /* TODO: Handle cmd if necessary */ + prm_reboot_mode = mode; omap_prm_reset_system(); } diff --git a/arch/arm/mach-omap2/board-generic.c b/arch/arm/mach-omap2/board-generic.c index fde6ccb3df6eb..68e0baad2bbf6 100644 --- a/arch/arm/mach-omap2/board-generic.c +++ b/arch/arm/mach-omap2/board-generic.c @@ -246,6 +246,12 @@ DT_MACHINE_START(AM33XX_DT, "Generic AM33XX (Flattened Device Tree)") .init_time = omap_init_time_of, .dt_compat = am33xx_boards_compat, .restart = am33xx_restart, + /* + * Historically am33xx supported only REBOOT_WARM even though default + * reboot_mode was REBOOT_COLD. Reflect legacy de-facto behaviour in + * SYSFS. + */ + .reboot_mode = REBOOT_WARM, MACHINE_END #endif diff --git a/arch/arm/mach-omap2/prm-regbits-33xx.h b/arch/arm/mach-omap2/prm-regbits-33xx.h index 3748c5266ae12..9b97f8c76cd17 100644 --- a/arch/arm/mach-omap2/prm-regbits-33xx.h +++ b/arch/arm/mach-omap2/prm-regbits-33xx.h @@ -15,6 +15,7 @@ #define AM33XX_GFX_MEM_STATEST_MASK (0x3 << 4) #define AM33XX_GLOBAL_WARM_SW_RST_MASK (1 << 1) #define AM33XX_RST_GLOBAL_WARM_SW_MASK (1 << 0) +#define AM33XX_RST_GLOBAL_COLD_SW_MASK (1 << 1) #define AM33XX_PRUSS_MEM_ONSTATE_MASK (0x3 << 5) #define AM33XX_PRUSS_MEM_RETSTATE_MASK (1 << 7) #define AM33XX_PRUSS_MEM_STATEST_MASK (0x3 << 23) diff --git a/arch/arm/mach-omap2/prm.h b/arch/arm/mach-omap2/prm.h index fc45a7ed09bb3..fc53a27eed013 100644 --- a/arch/arm/mach-omap2/prm.h +++ b/arch/arm/mach-omap2/prm.h @@ -15,6 +15,7 @@ # ifndef __ASSEMBLER__ extern struct omap_domain_base prm_base; extern u16 prm_features; +extern enum reboot_mode prm_reboot_mode; int omap_prcm_init(void); int omap2_prcm_base_init(void); # endif diff --git a/arch/arm/mach-omap2/prm33xx.c b/arch/arm/mach-omap2/prm33xx.c index 4a462310a4b09..505d685d6792e 100644 --- a/arch/arm/mach-omap2/prm33xx.c +++ b/arch/arm/mach-omap2/prm33xx.c @@ -10,6 +10,7 @@ #include #include #include +#include #include "powerdomain.h" #include "prm33xx.h" @@ -318,10 +319,19 @@ static int am33xx_check_vcvp(void) * * Immediately reboots the device through warm reset. */ -static void am33xx_prm_global_warm_sw_reset(void) +static void am33xx_prm_global_sw_reset(void) { - am33xx_prm_rmw_reg_bits(AM33XX_RST_GLOBAL_WARM_SW_MASK, - AM33XX_RST_GLOBAL_WARM_SW_MASK, + /* + * Historically AM33xx performed warm reset for all requested reboot_mode. + * Keep this behaviour unchanged for all except newly added REBOOT_COLD. + */ + u32 mask = AM33XX_RST_GLOBAL_WARM_SW_MASK; + + if (prm_reboot_mode == REBOOT_COLD) + mask = AM33XX_RST_GLOBAL_COLD_SW_MASK; + + am33xx_prm_rmw_reg_bits(mask, + mask, AM33XX_PRM_DEVICE_MOD, AM33XX_PRM_RSTCTRL_OFFSET); @@ -382,7 +392,7 @@ static struct prm_ll_data am33xx_prm_ll_data = { .assert_hardreset = am33xx_prm_assert_hardreset, .deassert_hardreset = am33xx_prm_deassert_hardreset, .is_hardreset_asserted = am33xx_prm_is_hardreset_asserted, - .reset_system = am33xx_prm_global_warm_sw_reset, + .reset_system = am33xx_prm_global_sw_reset, }; int __init am33xx_prm_init(const struct omap_prcm_init_data *data) diff --git a/arch/arm/mach-omap2/prm_common.c b/arch/arm/mach-omap2/prm_common.c index fd896f2295a11..f8771bdb5f068 100644 --- a/arch/arm/mach-omap2/prm_common.c +++ b/arch/arm/mach-omap2/prm_common.c @@ -66,6 +66,12 @@ struct omap_domain_base prm_base; u16 prm_features; +/* + * Platforms that implement different reboot modes can store the requested + * mode here. + */ +enum reboot_mode prm_reboot_mode; + /* * prm_ll_data: function pointers to SoC-specific implementations of * common PRM functions