Messages in this thread Patch in this message | | | From | Sergey Shtylyov <> | Subject | [PATCH v4] sh: avoid using IRQ0 on SH3/4 | Date | Tue, 3 May 2022 23:42:18 +0300 |
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Using IRQ0 by the platform devices is going to be disallowed soon (see [1]) and even now, when IRQ0 is about to be returned by platfrom_get_irq(), you see a big warning. The code supporting SH3/4 SoCs maps the IRQ #s starting at 0 -- modify that code to start the IRQ #s from 16 instead.
The patch should mostly affect the AP-SH4A-3A/AP-SH4AD-0A boards as they indeed use IRQ0 for the SMSC911x compatible Ethernet chip...
[1] https://lore.kernel.org/all/025679e1-1f0a-ae4b-4369-01164f691511@omp.ru/
Fixes: a85a6c86c25b ("driver core: platform: Clarify that IRQ 0 is invalid") Signed-off-by: Sergey Shtylyov <s.shtylyov@omp.ru> Reviewed-by: Geert Uytterhoeven <geert+renesas@glider.be> Tested-by: Geert Uytterhoeven <geert+renesas@glider.be> Tested-by: John Paul Adrian Glaubitz <glaubitz@physik.fu-berlin.de>
--- The patch is against Linus Torvalds' 'linux.git' repo.
Changes in version 4: - fixed up the off-chip base IRQ #s for the Dreamcast/Highlander/R2D/SE7724 boards.
Changes in version 3: - added an appropriate Fixes: tag and added a passage about it to the patch description; - added actual cases of the boards using IRQ0 to the patch description; - added Geert Uytterhoeven's and John Paul Adrian Glaubitz's tags; - updated the link to point to the version 2 of the patch.
Changes in version 2: - changed cmp/ge to cmp/hs in the assembly code.
arch/sh/include/mach-common/mach/highlander.h | 2 +- arch/sh/include/mach-common/mach/r2d.h | 2 +- arch/sh/include/mach-dreamcast/mach/sysasic.h | 2 +- arch/sh/include/mach-se/mach/se7724.h | 2 +- arch/sh/kernel/cpu/sh3/entry.S | 4 ++-- include/linux/sh_intc.h | 6 +++--- 6 files changed, 9 insertions(+), 9 deletions(-)
Index: linux/arch/sh/include/mach-common/mach/highlander.h =================================================================== --- linux.orig/arch/sh/include/mach-common/mach/highlander.h +++ linux/arch/sh/include/mach-common/mach/highlander.h @@ -176,7 +176,7 @@ #define IVDR_CK_ON 4 /* iVDR Clock ON */ #endif -#define HL_FPGA_IRQ_BASE 200 +#define HL_FPGA_IRQ_BASE (200 + 16) #define HL_NR_IRL 15 #define IRQ_AX88796 (HL_FPGA_IRQ_BASE + 0) Index: linux/arch/sh/include/mach-common/mach/r2d.h =================================================================== --- linux.orig/arch/sh/include/mach-common/mach/r2d.h +++ linux/arch/sh/include/mach-common/mach/r2d.h @@ -47,7 +47,7 @@ #define IRLCNTR1 (PA_BCR + 0) /* Interrupt Control Register1 */ -#define R2D_FPGA_IRQ_BASE 100 +#define R2D_FPGA_IRQ_BASE (100 + 16) #define IRQ_VOYAGER (R2D_FPGA_IRQ_BASE + 0) #define IRQ_EXT (R2D_FPGA_IRQ_BASE + 1) Index: linux/arch/sh/include/mach-dreamcast/mach/sysasic.h =================================================================== --- linux.orig/arch/sh/include/mach-dreamcast/mach/sysasic.h +++ linux/arch/sh/include/mach-dreamcast/mach/sysasic.h @@ -22,7 +22,7 @@ takes. */ -#define HW_EVENT_IRQ_BASE 48 +#define HW_EVENT_IRQ_BASE (48 + 16) /* IRQ 13 */ #define HW_EVENT_VSYNC (HW_EVENT_IRQ_BASE + 5) /* VSync */ Index: linux/arch/sh/include/mach-se/mach/se7724.h =================================================================== --- linux.orig/arch/sh/include/mach-se/mach/se7724.h +++ linux/arch/sh/include/mach-se/mach/se7724.h @@ -37,7 +37,7 @@ #define IRQ2_IRQ evt2irq(0x640) /* Bits in IRQ012 registers */ -#define SE7724_FPGA_IRQ_BASE 220 +#define SE7724_FPGA_IRQ_BASE (220 + 16) /* IRQ0 */ #define IRQ0_BASE SE7724_FPGA_IRQ_BASE Index: linux/arch/sh/kernel/cpu/sh3/entry.S =================================================================== --- linux.orig/arch/sh/kernel/cpu/sh3/entry.S +++ linux/arch/sh/kernel/cpu/sh3/entry.S @@ -470,9 +470,9 @@ ENTRY(handle_interrupt) mov r4, r0 ! save vector->jmp table offset for later shlr2 r4 ! vector to IRQ# conversion - add #-0x10, r4 - cmp/pz r4 ! is it a valid IRQ? + mov #0x10, r5 + cmp/hs r5, r4 ! is it a valid IRQ? bt 10f /* Index: linux/include/linux/sh_intc.h =================================================================== --- linux.orig/include/linux/sh_intc.h +++ linux/include/linux/sh_intc.h @@ -13,9 +13,9 @@ /* * Convert back and forth between INTEVT and IRQ values. */ -#ifdef CONFIG_CPU_HAS_INTEVT -#define evt2irq(evt) (((evt) >> 5) - 16) -#define irq2evt(irq) (((irq) + 16) << 5) +#ifdef CONFIG_CPU_HAS_INTEVT /* Avoid IRQ0 (invalid for platform devices) */ +#define evt2irq(evt) ((evt) >> 5) +#define irq2evt(irq) ((irq) << 5) #else #define evt2irq(evt) (evt) #define irq2evt(irq) (irq)
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