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author | Ahmad Fatoum <a.fatoum@pengutronix.de> | 2020-07-01 11:11:07 +0200 |
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committer | Sascha Hauer <s.hauer@pengutronix.de> | 2020-07-11 06:14:04 +0200 |
commit | 53d48be1757d379bcdeb94a63deeeea8e9965353 (patch) | |
tree | 3b926cc6b321c5c06a9f00a123b1eb06c1896a81 /arch/arm/mach-at91 | |
parent | c0edbe48a4e00194cf4490b7c673e6f4a91d251f (diff) | |
download | barebox-53d48be1757d379bcdeb94a63deeeea8e9965353.tar.gz barebox-53d48be1757d379bcdeb94a63deeeea8e9965353.tar.xz |
ARM: at91: add necessary Advanced Interrupt Controller configuration
Without reconfiguration of the AIC redirection, the OS interrupt
handling will misbehave later on. Add it to the SoC init.
Signed-off-by: Ahmad Fatoum <a.fatoum@pengutronix.de>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
Diffstat (limited to 'arch/arm/mach-at91')
-rw-r--r-- | arch/arm/mach-at91/Makefile | 2 | ||||
-rw-r--r-- | arch/arm/mach-at91/aic.c | 28 | ||||
-rw-r--r-- | arch/arm/mach-at91/include/mach/aic.h | 9 | ||||
-rw-r--r-- | arch/arm/mach-at91/sama5d2.c | 2 |
4 files changed, 40 insertions, 1 deletions
diff --git a/arch/arm/mach-at91/Makefile b/arch/arm/mach-at91/Makefile index 7c8399ee76..254bbeef27 100644 --- a/arch/arm/mach-at91/Makefile +++ b/arch/arm/mach-at91/Makefile @@ -1,4 +1,4 @@ -obj-y += setup.o +obj-y += setup.o aic.o lwl-y += at91_pmc_ll.o ddramc_ll.o matrix.o lwl-$(CONFIG_CLOCKSOURCE_ATMEL_PIT) += early_udelay.o diff --git a/arch/arm/mach-at91/aic.c b/arch/arm/mach-at91/aic.c new file mode 100644 index 0000000000..b40f1d214b --- /dev/null +++ b/arch/arm/mach-at91/aic.c @@ -0,0 +1,28 @@ +// SPDX-License-Identifier: BSD-1-Clause +/* + * Copyright (c) 2015, Atmel Corporation + * + * Atmel's name may not be used to endorse or promote products derived from + * this software without specific prior written permission. + */ + +#include <mach/aic.h> +#include <io.h> + +#define SFR_AICREDIR 0x54 +#define SFR_SN1 0x50 /* Serial Number 1 Register */ + +void at91_aic_redir(void __iomem *sfr, u32 key) +{ + u32 key32; + + if (readl(sfr + SFR_AICREDIR) & 0x01) + return; + + key32 = readl(sfr + SFR_SN1) ^ key; + writel(key32 | 0x01, sfr + SFR_AICREDIR); + /* bits[31:1] = key */ + /* bit[0] = 1 => all interrupts redirected to AIC */ + /* bit[0] = 0 => secure interrupts directed to SAIC, + others to AIC (default) */ +} diff --git a/arch/arm/mach-at91/include/mach/aic.h b/arch/arm/mach-at91/include/mach/aic.h new file mode 100644 index 0000000000..c1f026b60c --- /dev/null +++ b/arch/arm/mach-at91/include/mach/aic.h @@ -0,0 +1,9 @@ +/* SPDX-License-Identifier: BSD-1-Clause */ +#ifndef __AT91_AIC_H_ +#define __AT91_AIC_H_ + +#include <linux/compiler.h> + +void at91_aic_redir(void __iomem *sfr, u32 key); + +#endif diff --git a/arch/arm/mach-at91/sama5d2.c b/arch/arm/mach-at91/sama5d2.c index 2f74b0b38d..c498b09645 100644 --- a/arch/arm/mach-at91/sama5d2.c +++ b/arch/arm/mach-at91/sama5d2.c @@ -3,6 +3,7 @@ #include <common.h> #include <of.h> #include <init.h> +#include <mach/aic.h> #include <mach/sama5d2.h> #include <asm/cache-l2x0.h> #include <asm/mmu.h> @@ -44,6 +45,7 @@ static int sama5d2_init(void) if (!of_machine_is_compatible("atmel,sama5d2")) return 0; + at91_aic_redir(SAMA5D2_BASE_SFR, SAMA5D2_AICREDIR_KEY); sama5d2_can_ram_init(); sama5d2_l2x0_init(); |