ARM: riscpc: add ecard quirk for Atomwide 3port serial card

Atomwide 3port serial cards seem to leave their interrupts active when
exiting RISC OS, resulting in an interrupt storm during boot, and the
expansion card interrupt being disabled.  Avoid this by manually
disabling the interrupt on each serial port via a custom quirk function.

Signed-off-by: Russell King <rmk+kernel@armlinux.org.uk>

diff --git a/arch/arm/mach-rpc/ecard.c b/arch/arm/mach-rpc/ecard.c
index 3e7b81cc427404c1f2581e394cc5fb6e6dac45a8..eec5ecd6e9482a2d40dc2c475ae1981b7aebc438 100644 (file)
--- a/arch/arm/mach-rpc/ecard.c
+++ b/arch/arm/mach-rpc/ecard.c
@@ -70,17 +70,21 @@ struct expcard_blacklist {
        unsigned short   manufacturer;
        unsigned short   product;
        const char      *type;
+       void (*init)(ecard_t *ec);
 };
 
 static ecard_t *cards;
 static ecard_t *slot_to_expcard[MAX_ECARDS];
 static unsigned int ectcr;
 
+static void atomwide_3p_quirk(ecard_t *ec);
+
 /* List of descriptions of cards which don't have an extended
  * identification, or chunk directories containing a description.
  */
 static struct expcard_blacklist __initdata blacklist[] = {
-       { MANU_ACORN, PROD_ACORN_ETHER1, "Acorn Ether1" }
+       { MANU_ACORN, PROD_ACORN_ETHER1, "Acorn Ether1" },
+       { MANU_ATOMWIDE, PROD_ATOMWIDE_3PSERIAL, NULL, atomwide_3p_quirk },
 };
 
 asmlinkage extern int
@@ -871,6 +875,16 @@ void __iomem *ecardm_iomap(struct expansion_card *ec, unsigned int res,
 }
 EXPORT_SYMBOL(ecardm_iomap);
 
+static void atomwide_3p_quirk(ecard_t *ec)
+{
+       void __iomem *addr = __ecard_address(ec, ECARD_IOC, ECARD_SYNC);
+       unsigned int i;
+
+       /* Disable interrupts on each port */
+       for (i = 0x2000; i <= 0x2800; i += 0x0400)
+               writeb(0, addr + i + 4);        
+}
+
 /*
  * Probe for an expansion card.
  *
@@ -927,7 +941,10 @@ static int __init ecard_probe(int slot, unsigned irq, card_type_t type)
        for (i = 0; i < ARRAY_SIZE(blacklist); i++)
                if (blacklist[i].manufacturer == ec->cid.manufacturer &&
                    blacklist[i].product == ec->cid.product) {
-                       ec->card_desc = blacklist[i].type;
+                       if (blacklist[i].type)
+                               ec->card_desc = blacklist[i].type;
+                       if (blacklist[i].init)
+                               blacklist[i].init(ec);
                        break;
                }