From: Fabrizio Castro <fabrizio.castro@bp.renesas.com> To: Geert Uytterhoeven <geert+renesas@glider.be>, Simon Horman <horms@verge.net.au>, Russell King <linux@armlinux.org.uk> Cc: Fabrizio Castro <fabrizio.castro@bp.renesas.com>, Magnus Damm <magnus.damm@gmail.com>, linux-arm-kernel@lists.infradead.org, linux-renesas-soc@vger.kernel.org, Chris Paterson <Chris.Paterson2@renesas.com>, Biju Das <biju.das@bp.renesas.com>, Ramesh Shanmugasundaram <ramesh.shanmugasundaram@bp.renesas.com> Subject: [PATCH v7] ARM: shmobile: Add watchdog support Date: Wed, 14 Mar 2018 11:13:53 +0000 [thread overview] Message-ID: <1521026033-8494-1-git-send-email-fabrizio.castro@bp.renesas.com> (raw) In-Reply-To: <CAMuHMdVRxTCG0vCEEmhHm4XsZeJaPM1b_LOeZxqNdhRqsH0oZw@mail.gmail.com> On R-Car Gen2 and RZ/G1 platforms, we use the SBAR registers to make non boot CPUs run a routine designed to bring up SMP and deal with hot plug. The value contained in the SBAR registers is not initialized by a WDT triggered reset, which means that after a WDT triggered reset we jump to the SMP bring up routine, preventing the system from executing the bootrom code. The purpose of this patch is to jump to the bootrom code in case of a WDT triggered reset, and keep the SMP functionality untouched. In order to tell if the code had been called due to the WDT overflowing we are testing WOVF from register RWTCSRA. The new function shmobile_boot_vector_gen2 isn't replacing shmobile_boot_vector for backward compatibility reasons. The kernel will install the best option (either shmobile_boot_vector or shmobile_boot_vector_gen2) to ICRAM1 after parsing the device tree, according to the amount of memory available. Since shmobile_boot_vector has become bigger, "reg" property of nodes compatible with "renesas,smp-sram" now need to be set to a value greater or equal to "<0 0x60>". Signed-off-by: Fabrizio Castro <fabrizio.castro@bp.renesas.com> Signed-off-by: Ramesh Shanmugasundaram <ramesh.shanmugasundaram@bp.renesas.com> Reviewed-by: Geert Uytterhoeven <geert+renesas@glider.be> --- v6->v7: * restored ifdef within arch/arm/mach-shmobile/headsmp.S arch/arm/mach-shmobile/common.h | 4 +++ arch/arm/mach-shmobile/headsmp.S | 55 ++++++++++++++++++++++++++++++++++++++++ 2 files changed, 59 insertions(+) diff --git a/arch/arm/mach-shmobile/common.h b/arch/arm/mach-shmobile/common.h index a8fa4f7..43c1ac69 100644 --- a/arch/arm/mach-shmobile/common.h +++ b/arch/arm/mach-shmobile/common.h @@ -7,6 +7,10 @@ extern void shmobile_init_delay(void); extern void shmobile_boot_vector(void); extern unsigned long shmobile_boot_fn; extern unsigned long shmobile_boot_size; +extern void shmobile_boot_vector_gen2(void); +extern unsigned long shmobile_boot_fn_gen2; +extern unsigned long shmobile_boot_cpu_gen2; +extern unsigned long shmobile_boot_size_gen2; extern void shmobile_smp_boot(void); extern void shmobile_smp_sleep(void); extern void shmobile_smp_hook(unsigned int cpu, unsigned long fn, diff --git a/arch/arm/mach-shmobile/headsmp.S b/arch/arm/mach-shmobile/headsmp.S index 32e0bf6..cef8e8c 100644 --- a/arch/arm/mach-shmobile/headsmp.S +++ b/arch/arm/mach-shmobile/headsmp.S @@ -16,6 +16,11 @@ #include <asm/assembler.h> #include <asm/memory.h> +#define SCTLR_MMU 0x01 +#define BOOTROM_ADDRESS 0xE6340000 +#define RWTCSRA_ADDRESS 0xE6020004 +#define RWTCSRA_WOVF 0x10 + /* * Reset vector for secondary CPUs. * This will be mapped at address 0 by SBAR register. @@ -37,6 +42,56 @@ shmobile_boot_fn: shmobile_boot_size: .long . - shmobile_boot_vector +#ifdef CONFIG_ARCH_RCAR_GEN2 +/* + * Reset vector for R-Car Gen2 and RZ/G1 secondary CPUs. + * This will be mapped at address 0 by SBAR register. + */ +ENTRY(shmobile_boot_vector_gen2) + mrc p15, 0, r0, c0, c0, 5 @ r0 = MPIDR + ldr r1, shmobile_boot_cpu_gen2 + cmp r0, r1 + bne shmobile_smp_continue_gen2 + + mrc p15, 0, r1, c1, c0, 0 @ r1 = SCTLR + and r0, r1, #SCTLR_MMU + cmp r0, #SCTLR_MMU + beq shmobile_smp_continue_gen2 + + ldr r0, rwtcsra + mov r1, #0 + ldrb r1, [r0] + and r0, r1, #RWTCSRA_WOVF + cmp r0, #RWTCSRA_WOVF + bne shmobile_smp_continue_gen2 + + ldr r0, bootrom + bx r0 + +shmobile_smp_continue_gen2: + ldr r1, shmobile_boot_fn_gen2 + bx r1 + +ENDPROC(shmobile_boot_vector_gen2) + + .align 4 +rwtcsra: + .word RWTCSRA_ADDRESS +bootrom: + .word BOOTROM_ADDRESS + .globl shmobile_boot_cpu_gen2 +shmobile_boot_cpu_gen2: + .word 0x00000000 + + .align 2 + .globl shmobile_boot_fn_gen2 +shmobile_boot_fn_gen2: + .space 4 + .globl shmobile_boot_size_gen2 +shmobile_boot_size_gen2: + .long . - shmobile_boot_vector_gen2 +#endif /* CONFIG_ARCH_RCAR_GEN2 */ + /* * Per-CPU SMP boot function/argument selection code based on MPIDR */ -- 2.7.4
WARNING: multiple messages have this Message-ID (diff)
From: fabrizio.castro@bp.renesas.com (Fabrizio Castro) To: linux-arm-kernel@lists.infradead.org Subject: [PATCH v7] ARM: shmobile: Add watchdog support Date: Wed, 14 Mar 2018 11:13:53 +0000 [thread overview] Message-ID: <1521026033-8494-1-git-send-email-fabrizio.castro@bp.renesas.com> (raw) In-Reply-To: <CAMuHMdVRxTCG0vCEEmhHm4XsZeJaPM1b_LOeZxqNdhRqsH0oZw@mail.gmail.com> On R-Car Gen2 and RZ/G1 platforms, we use the SBAR registers to make non boot CPUs run a routine designed to bring up SMP and deal with hot plug. The value contained in the SBAR registers is not initialized by a WDT triggered reset, which means that after a WDT triggered reset we jump to the SMP bring up routine, preventing the system from executing the bootrom code. The purpose of this patch is to jump to the bootrom code in case of a WDT triggered reset, and keep the SMP functionality untouched. In order to tell if the code had been called due to the WDT overflowing we are testing WOVF from register RWTCSRA. The new function shmobile_boot_vector_gen2 isn't replacing shmobile_boot_vector for backward compatibility reasons. The kernel will install the best option (either shmobile_boot_vector or shmobile_boot_vector_gen2) to ICRAM1 after parsing the device tree, according to the amount of memory available. Since shmobile_boot_vector has become bigger, "reg" property of nodes compatible with "renesas,smp-sram" now need to be set to a value greater or equal to "<0 0x60>". Signed-off-by: Fabrizio Castro <fabrizio.castro@bp.renesas.com> Signed-off-by: Ramesh Shanmugasundaram <ramesh.shanmugasundaram@bp.renesas.com> Reviewed-by: Geert Uytterhoeven <geert+renesas@glider.be> --- v6->v7: * restored ifdef within arch/arm/mach-shmobile/headsmp.S arch/arm/mach-shmobile/common.h | 4 +++ arch/arm/mach-shmobile/headsmp.S | 55 ++++++++++++++++++++++++++++++++++++++++ 2 files changed, 59 insertions(+) diff --git a/arch/arm/mach-shmobile/common.h b/arch/arm/mach-shmobile/common.h index a8fa4f7..43c1ac69 100644 --- a/arch/arm/mach-shmobile/common.h +++ b/arch/arm/mach-shmobile/common.h @@ -7,6 +7,10 @@ extern void shmobile_init_delay(void); extern void shmobile_boot_vector(void); extern unsigned long shmobile_boot_fn; extern unsigned long shmobile_boot_size; +extern void shmobile_boot_vector_gen2(void); +extern unsigned long shmobile_boot_fn_gen2; +extern unsigned long shmobile_boot_cpu_gen2; +extern unsigned long shmobile_boot_size_gen2; extern void shmobile_smp_boot(void); extern void shmobile_smp_sleep(void); extern void shmobile_smp_hook(unsigned int cpu, unsigned long fn, diff --git a/arch/arm/mach-shmobile/headsmp.S b/arch/arm/mach-shmobile/headsmp.S index 32e0bf6..cef8e8c 100644 --- a/arch/arm/mach-shmobile/headsmp.S +++ b/arch/arm/mach-shmobile/headsmp.S @@ -16,6 +16,11 @@ #include <asm/assembler.h> #include <asm/memory.h> +#define SCTLR_MMU 0x01 +#define BOOTROM_ADDRESS 0xE6340000 +#define RWTCSRA_ADDRESS 0xE6020004 +#define RWTCSRA_WOVF 0x10 + /* * Reset vector for secondary CPUs. * This will be mapped at address 0 by SBAR register. @@ -37,6 +42,56 @@ shmobile_boot_fn: shmobile_boot_size: .long . - shmobile_boot_vector +#ifdef CONFIG_ARCH_RCAR_GEN2 +/* + * Reset vector for R-Car Gen2 and RZ/G1 secondary CPUs. + * This will be mapped at address 0 by SBAR register. + */ +ENTRY(shmobile_boot_vector_gen2) + mrc p15, 0, r0, c0, c0, 5 @ r0 = MPIDR + ldr r1, shmobile_boot_cpu_gen2 + cmp r0, r1 + bne shmobile_smp_continue_gen2 + + mrc p15, 0, r1, c1, c0, 0 @ r1 = SCTLR + and r0, r1, #SCTLR_MMU + cmp r0, #SCTLR_MMU + beq shmobile_smp_continue_gen2 + + ldr r0, rwtcsra + mov r1, #0 + ldrb r1, [r0] + and r0, r1, #RWTCSRA_WOVF + cmp r0, #RWTCSRA_WOVF + bne shmobile_smp_continue_gen2 + + ldr r0, bootrom + bx r0 + +shmobile_smp_continue_gen2: + ldr r1, shmobile_boot_fn_gen2 + bx r1 + +ENDPROC(shmobile_boot_vector_gen2) + + .align 4 +rwtcsra: + .word RWTCSRA_ADDRESS +bootrom: + .word BOOTROM_ADDRESS + .globl shmobile_boot_cpu_gen2 +shmobile_boot_cpu_gen2: + .word 0x00000000 + + .align 2 + .globl shmobile_boot_fn_gen2 +shmobile_boot_fn_gen2: + .space 4 + .globl shmobile_boot_size_gen2 +shmobile_boot_size_gen2: + .long . - shmobile_boot_vector_gen2 +#endif /* CONFIG_ARCH_RCAR_GEN2 */ + /* * Per-CPU SMP boot function/argument selection code based on MPIDR */ -- 2.7.4
next prev parent reply other threads:[~2018-03-14 11:14 UTC|newest] Thread overview: 177+ messages / expand[flat|nested] mbox.gz Atom feed top 2018-02-12 17:44 [PATCH v5 00/26] Fix watchdog on Renesas R-Car Gen2 and RZ/G1 Fabrizio Castro 2018-02-12 17:44 ` Fabrizio Castro 2018-02-12 17:44 ` Fabrizio Castro 2018-02-12 17:44 ` [PATCH v5 01/26] ARM: shmobile: Add watchdog support Fabrizio Castro 2018-02-12 17:44 ` Fabrizio Castro 2018-02-28 12:57 ` Geert Uytterhoeven 2018-02-28 12:57 ` Geert Uytterhoeven 2018-02-28 12:57 ` Geert Uytterhoeven 2018-02-28 17:37 ` Fabrizio Castro 2018-02-28 17:37 ` Fabrizio Castro 2018-02-28 17:37 ` Fabrizio Castro 2018-02-28 17:37 ` Fabrizio Castro 2018-02-28 17:40 ` [PATCH v6 " Fabrizio Castro 2018-02-28 17:40 ` Fabrizio Castro 2018-02-28 17:40 ` Fabrizio Castro 2018-03-01 9:44 ` Simon Horman 2018-03-01 9:44 ` Simon Horman 2018-03-01 9:44 ` Simon Horman 2018-03-13 13:43 ` Geert Uytterhoeven 2018-03-13 13:43 ` Geert Uytterhoeven 2018-03-13 13:43 ` Geert Uytterhoeven 2018-03-14 11:02 ` Fabrizio Castro 2018-03-14 11:02 ` Fabrizio Castro 2018-03-14 11:02 ` Fabrizio Castro 2018-03-14 11:02 ` Fabrizio Castro 2018-03-14 11:13 ` Fabrizio Castro [this message] 2018-03-14 11:13 ` [PATCH v7] " Fabrizio Castro 2018-03-14 12:43 ` Simon Horman 2018-03-14 12:43 ` Simon Horman 2018-03-14 13:26 ` Fabrizio Castro 2018-03-14 13:26 ` Fabrizio Castro 2018-03-16 11:49 ` Simon Horman 2018-03-16 11:49 ` Simon Horman 2018-02-12 17:44 ` [PATCH v5 02/26] ARM: dts: r8a7743: Adjust SMP routine size Fabrizio Castro 2018-02-12 17:44 ` Fabrizio Castro 2018-02-12 17:44 ` [PATCH v5 03/26] ARM: dts: r8a7745: " Fabrizio Castro 2018-02-12 17:44 ` Fabrizio Castro 2018-02-12 17:44 ` [PATCH v5 04/26] ARM: dts: r8a7790: " Fabrizio Castro 2018-02-12 17:44 ` Fabrizio Castro 2018-02-12 17:44 ` [PATCH v5 07/26] ARM: dts: r8a7793: " Fabrizio Castro 2018-02-12 17:44 ` Fabrizio Castro 2018-02-12 17:44 ` [PATCH v5 14/26] ARM: shmobile: defconfig: Enable RENESAS_WDT_GEN Fabrizio Castro 2018-02-12 17:44 ` Fabrizio Castro [not found] ` <1518457475-4480-15-git-send-email-fabrizio.castro-kTT6dE0pTRh9uiUsa/gSgQ@public.gmane.org> 2018-02-13 13:08 ` Fabrizio Castro 2018-02-13 13:08 ` Fabrizio Castro 2018-02-13 13:08 ` Fabrizio Castro 2018-02-13 13:08 ` Fabrizio Castro [not found] ` <TY1PR06MB0895970E6725F954D1A97E4CC0F60-/PRLmSCtZ16EeHdvShrxA20DtJ1/0DrXvxpqHgZTriW3zl9H0oFU5g@public.gmane.org> 2018-02-15 16:20 ` Simon Horman 2018-02-15 16:20 ` Simon Horman 2018-02-15 16:20 ` Simon Horman 2018-05-02 9:38 ` Simon Horman 2018-05-02 9:38 ` Simon Horman 2018-05-02 9:38 ` Simon Horman 2018-02-12 17:44 ` [PATCH v5 15/26] clk: renesas: r8a7743: Add rwdt clock Fabrizio Castro 2018-02-12 17:44 ` Fabrizio Castro 2018-02-12 17:44 ` [PATCH v5 16/26] clk: renesas: r8a7745: " Fabrizio Castro 2018-02-12 17:44 ` Fabrizio Castro [not found] ` <1518457475-4480-1-git-send-email-fabrizio.castro-kTT6dE0pTRh9uiUsa/gSgQ@public.gmane.org> 2018-02-12 17:44 ` [PATCH v5 05/26] ARM: dts: r8a7791: Adjust SMP routine size Fabrizio Castro 2018-02-12 17:44 ` Fabrizio Castro 2018-02-12 17:44 ` Fabrizio Castro 2018-02-12 17:44 ` [PATCH v5 06/26] ARM: dts: r8a7792: " Fabrizio Castro 2018-02-12 17:44 ` Fabrizio Castro 2018-02-12 17:44 ` Fabrizio Castro 2018-02-12 17:44 ` [PATCH v5 08/26] ARM: dts: r8a7794: " Fabrizio Castro 2018-02-12 17:44 ` Fabrizio Castro 2018-02-12 17:44 ` Fabrizio Castro 2018-02-12 17:44 ` [PATCH v5 09/26] soc: renesas: rcar-rst: Enable watchdog as reset trigger for Gen2 Fabrizio Castro 2018-02-12 17:44 ` Fabrizio Castro 2018-02-12 17:44 ` Fabrizio Castro 2018-02-13 8:19 ` Simon Horman 2018-02-13 8:19 ` Simon Horman 2018-02-13 8:19 ` Simon Horman 2018-02-13 12:57 ` Fabrizio Castro 2018-02-13 12:57 ` Fabrizio Castro 2018-02-13 12:57 ` Fabrizio Castro 2018-02-13 12:57 ` Fabrizio Castro 2018-02-13 13:02 ` [PATCH v6 " Fabrizio Castro 2018-02-13 13:02 ` Fabrizio Castro 2018-02-13 13:02 ` Fabrizio Castro 2018-02-15 16:20 ` Simon Horman 2018-02-15 16:20 ` Simon Horman 2018-02-15 16:20 ` Simon Horman 2018-02-12 17:44 ` [PATCH v5 10/26] ARM: shmobile: rcar-gen2: Add watchdog support Fabrizio Castro 2018-02-12 17:44 ` Fabrizio Castro 2018-02-12 17:44 ` Fabrizio Castro [not found] ` <1518457475-4480-11-git-send-email-fabrizio.castro-kTT6dE0pTRh9uiUsa/gSgQ@public.gmane.org> 2018-02-13 8:21 ` Simon Horman 2018-02-13 8:21 ` Simon Horman 2018-02-13 8:21 ` Simon Horman 2018-02-12 17:44 ` [PATCH v5 11/26] dt-bindings: watchdog: renesas-wdt: Add R-Car Gen2 support Fabrizio Castro 2018-02-12 17:44 ` Fabrizio Castro 2018-02-12 17:44 ` Fabrizio Castro 2018-02-12 17:44 ` [PATCH v5 12/26] watchdog: renesas_wdt: " Fabrizio Castro 2018-02-12 17:44 ` Fabrizio Castro 2018-02-12 17:44 ` Fabrizio Castro [not found] ` <1518457475-4480-13-git-send-email-fabrizio.castro-kTT6dE0pTRh9uiUsa/gSgQ@public.gmane.org> 2018-02-12 19:24 ` Guenter Roeck 2018-02-12 19:24 ` Guenter Roeck 2018-02-12 19:24 ` Guenter Roeck 2018-02-12 20:58 ` Wolfram Sang 2018-02-12 20:58 ` Wolfram Sang 2018-02-12 20:58 ` Wolfram Sang 2018-02-21 15:43 ` [PATCH] watchdog: renesas_wdt: Blacklist early R-Car Gen2 SoCs Geert Uytterhoeven 2018-02-21 16:22 ` Simon Horman 2018-02-28 17:48 ` Fabrizio Castro 2018-02-28 19:24 ` [PATCH v5 12/26] watchdog: renesas_wdt: Add R-Car Gen2 support Geert Uytterhoeven 2018-02-28 19:24 ` Geert Uytterhoeven 2018-02-28 19:24 ` Geert Uytterhoeven 2018-03-01 15:34 ` Fabrizio Castro 2018-03-01 15:34 ` Fabrizio Castro 2018-03-01 15:34 ` Fabrizio Castro 2018-03-01 15:34 ` Fabrizio Castro 2018-02-12 17:44 ` [PATCH v5 13/26] watchdog: renesas_wdt: Add restart handler Fabrizio Castro 2018-02-12 17:44 ` Fabrizio Castro 2018-02-12 17:44 ` Fabrizio Castro 2018-02-12 20:59 ` Wolfram Sang 2018-02-12 20:59 ` Wolfram Sang 2018-02-12 20:59 ` Wolfram Sang 2018-02-12 17:44 ` [PATCH v5 17/26] clk: renesas: r8a7790: Add rwdt clock Fabrizio Castro 2018-02-12 17:44 ` Fabrizio Castro 2018-02-12 17:44 ` Fabrizio Castro 2018-02-12 17:44 ` [PATCH v5 18/26] clk: renesas: r8a7791/r8a7793: " Fabrizio Castro 2018-02-12 17:44 ` Fabrizio Castro 2018-02-12 17:44 ` Fabrizio Castro 2018-02-12 17:44 ` [PATCH v5 22/26] ARM: dts: r8a7790: Add watchdog support to SoC dtsi Fabrizio Castro 2018-02-12 17:44 ` Fabrizio Castro 2018-02-12 17:44 ` Fabrizio Castro 2018-02-12 17:44 ` [PATCH v5 25/26] ARM: dts: iwg20m: Add watchdog support to SoM dtsi Fabrizio Castro 2018-02-12 17:44 ` Fabrizio Castro 2018-02-12 17:44 ` Fabrizio Castro 2018-02-12 17:44 ` [PATCH v5 19/26] clk: renesas: r8a7794: Add rwdt clock Fabrizio Castro 2018-02-12 17:44 ` Fabrizio Castro 2018-02-12 17:44 ` [PATCH v5 20/26] ARM: dts: r8a7743: Add watchdog support to SoC dtsi Fabrizio Castro 2018-02-12 17:44 ` Fabrizio Castro 2018-02-12 17:44 ` [PATCH v5 21/26] ARM: dts: r8a7745: " Fabrizio Castro 2018-02-12 17:44 ` Fabrizio Castro 2018-02-12 17:44 ` [PATCH v5 23/26] ARM: dts: r8a7791: " Fabrizio Castro 2018-02-12 17:44 ` Fabrizio Castro 2018-02-12 17:44 ` [PATCH v5 24/26] ARM: dts: r8a7794: " Fabrizio Castro 2018-02-12 17:44 ` Fabrizio Castro 2018-02-12 17:44 ` [PATCH v5 26/26] ARM: dts: iwg22m: Add watchdog support to SoM dtsi Fabrizio Castro 2018-02-12 17:44 ` Fabrizio Castro 2018-02-13 8:05 ` [PATCH v5 00/26] Fix watchdog on Renesas R-Car Gen2 and RZ/G1 Simon Horman 2018-02-13 8:05 ` Simon Horman 2018-02-13 8:05 ` Simon Horman 2018-02-20 12:51 ` Geert Uytterhoeven 2018-02-20 12:51 ` Geert Uytterhoeven 2018-02-20 12:51 ` Geert Uytterhoeven 2018-02-21 16:13 ` Simon Horman 2018-02-21 16:13 ` Simon Horman 2018-02-21 16:13 ` Simon Horman 2018-02-21 16:30 ` Geert Uytterhoeven 2018-02-21 16:30 ` Geert Uytterhoeven 2018-02-21 16:30 ` Geert Uytterhoeven 2018-02-21 18:32 ` Simon Horman 2018-02-21 18:32 ` Simon Horman 2018-02-21 18:32 ` Simon Horman 2018-02-22 8:38 ` Geert Uytterhoeven 2018-02-22 8:38 ` Geert Uytterhoeven 2018-02-22 8:38 ` Geert Uytterhoeven 2018-02-23 8:14 ` Simon Horman 2018-02-23 8:14 ` Simon Horman 2018-02-23 8:14 ` Simon Horman 2018-03-01 10:20 ` Geert Uytterhoeven 2018-03-01 10:20 ` Geert Uytterhoeven 2018-03-01 10:20 ` Geert Uytterhoeven 2018-03-13 20:05 ` Simon Horman 2018-03-13 20:05 ` Simon Horman 2018-03-13 20:05 ` Simon Horman 2018-03-14 8:17 ` Geert Uytterhoeven 2018-03-14 8:17 ` Geert Uytterhoeven 2018-03-14 8:17 ` Geert Uytterhoeven 2018-03-14 8:17 ` Geert Uytterhoeven 2018-04-18 13:37 ` Geert Uytterhoeven 2018-04-18 13:37 ` Geert Uytterhoeven 2018-04-18 13:37 ` Geert Uytterhoeven 2018-04-24 9:09 ` Simon Horman 2018-04-24 9:09 ` Simon Horman 2018-04-24 9:09 ` Simon Horman
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