m68k: amiga: Turn off Warp1260 interrupts during boot

On an Amiga 1200 equipped with a Warp1260 accelerator, an interrupt
storm coming from the accelerator board causes the machine to crash in
local_irq_enable() or auto_irq_enable().  Disabling interrupts for the
Warp1260 in amiga_parse_bootinfo() fixes the problem.

Link: https://lore.kernel.org/r/ZkjwzVwYeQtyAPrL@amaterasu.local
Cc: stable <stable@kernel.org>
Signed-off-by: Paolo Pisati <p.pisati@gmail.com>
Reviewed-by: Michael Schmitz <schmitzmic@gmail.com>
Reviewed-by: Geert Uytterhoeven <geert@linux-m68k.org>
Link: https://lore.kernel.org/r/20240601153254.186225-1-p.pisati@gmail.com
Signed-off-by: Geert Uytterhoeven <geert@linux-m68k.org>

Author: piso77

arch/m68k/amiga/config.c

@@ -180,6 +180,15 @@ int __init amiga_parse_bootinfo(const struct bi_record *record)
 			dev->slotsize = be16_to_cpu(cd->cd_SlotSize);
 			dev->boardaddr = be32_to_cpu(cd->cd_BoardAddr);
 			dev->boardsize = be32_to_cpu(cd->cd_BoardSize);
+
+			/* CS-LAB Warp 1260 workaround */
+			if (be16_to_cpu(dev->rom.er_Manufacturer) == ZORRO_MANUF(ZORRO_PROD_CSLAB_WARP_1260) &&
+			    dev->rom.er_Product == ZORRO_PROD(ZORRO_PROD_CSLAB_WARP_1260)) {
+
+				/* turn off all interrupts */
+				pr_info("Warp 1260 card detected: applying interrupt storm workaround\n");
+				*(uint32_t *)(dev->boardaddr + 0x1000) = 0xfff;
+			}
 		} else
 			pr_warn("amiga_parse_bootinfo: too many AutoConfig devices\n");
 #endif /* CONFIG_ZORRO */

include/uapi/linux/zorro_ids.h

@@ -449,6 +449,9 @@
 #define  ZORRO_PROD_VMC_ISDN_BLASTER_Z2				ZORRO_ID(VMC, 0x01, 0)
 #define  ZORRO_PROD_VMC_HYPERCOM_4				ZORRO_ID(VMC, 0x02, 0)
 
+#define ZORRO_MANUF_CSLAB					0x1400
+#define  ZORRO_PROD_CSLAB_WARP_1260				ZORRO_ID(CSLAB, 0x65, 0)
+
 #define ZORRO_MANUF_INFORMATION					0x157C
 #define  ZORRO_PROD_INFORMATION_ISDN_ENGINE_I			ZORRO_ID(INFORMATION, 0x64, 0)