IP22 EISA support update.

Signed-off-by: Thiemo Seufer <ths@networkno.de>
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>

1 files changed, 67 insertions, 81 deletions

diff --git a/arch/mips/sgi-ip22/ip22-eisa.c b/arch/mips/sgi-ip22/ip22-eisa.c
index fa0e719c5bd1..b19820110aa3 100644
--- a/arch/mips/sgi-ip22/ip22-eisa.c
+++ b/arch/mips/sgi-ip22/ip22-eisa.c
@@ -29,6 +29,7 @@
 #include <linux/sched.h>
 #include <linux/interrupt.h>
 #include <linux/delay.h>
+#include <asm/io.h>
 #include <asm/irq.h>
 #include <asm/mipsregs.h>
 #include <asm/addrspace.h>
@@ -37,42 +38,29 @@
 #include <asm/sgi/mc.h>
 #include <asm/sgi/ip22.h>
 
-#define EISA_MAX_SLOTS            4
+/* I2 has four EISA slots. */
+#define IP22_EISA_MAX_SLOTS       4
 #define EISA_MAX_IRQ             16
 
-#define EISA_TO_PHYS(x)  (0x00080000 | (x))
-#define EISA_TO_KSEG1(x) ((void *) KSEG1ADDR(EISA_TO_PHYS((x))))
-
-#define EIU_MODE_REG     0x0009ffc0
-#define EIU_STAT_REG     0x0009ffc4
-#define EIU_PREMPT_REG   0x0009ffc8
-#define EIU_QUIET_REG    0x0009ffcc
-#define EIU_INTRPT_ACK   0x00090004
-
-#define EISA_DMA1_STATUS            8
-#define EISA_INT1_CTRL           0x20
-#define EISA_INT1_MASK           0x21
-#define EISA_INT2_CTRL           0xA0
-#define EISA_INT2_MASK           0xA1
-#define EISA_DMA2_STATUS         0xD0
-#define EISA_DMA2_WRITE_SINGLE   0xD4
-#define EISA_EXT_NMI_RESET_CTRL 0x461
-#define EISA_INT1_EDGE_LEVEL    0x4D0
-#define EISA_INT2_EDGE_LEVEL    0x4D1
-#define EISA_VENDOR_ID_OFFSET   0xC80
-
-#define EIU_WRITE_32(x,y) { *((u32 *) KSEG1ADDR(x)) = (u32) (y); mb(); }
-#define EIU_READ_8(x) *((u8 *) KSEG1ADDR(x))
-#define EISA_WRITE_8(x,y) { *((u8 *) EISA_TO_KSEG1(x)) = (u8) (y); mb(); }
-#define EISA_READ_8(x) *((u8 *) EISA_TO_KSEG1(x))
-
-static char *decode_eisa_sig(u8 * sig)
+#define EIU_MODE_REG     0x0001ffc0
+#define EIU_STAT_REG     0x0001ffc4
+#define EIU_PREMPT_REG   0x0001ffc8
+#define EIU_QUIET_REG    0x0001ffcc
+#define EIU_INTRPT_ACK   0x00010004
+
+static char __init *decode_eisa_sig(unsigned long addr)
 {
-        static char sig_str[8];
-        u16 rev;
+        static char sig_str[EISA_SIG_LEN];
+        u8 sig[4];
+        u16 rev;
+        int i;
+
+        for (i = 0; i < 4; i++) {
+                sig[i] = inb (addr + i);
 
-        if (sig[0] & 0x80)
-                return NULL;
+                if (!i && (sig[0] & 0x80))
+                        return NULL;
+        }
 
         sig_str[0] = ((sig[0] >> 2) & 0x1f) + ('A' - 1);
         sig_str[1] = (((sig[0] & 3) << 3) | (sig[1] >> 5)) + ('A' - 1);
@@ -83,23 +71,26 @@ static char *decode_eisa_sig(u8 * sig)
         return sig_str;
 }
 
-static void ip22_eisa_intr(int irq, void *dev_id, struct pt_regs *regs)
+static irqreturn_t ip22_eisa_intr(int irq, void *dev_id, struct pt_regs *regs)
 {
         u8 eisa_irq;
         u8 dma1, dma2;
 
-        eisa_irq = EIU_READ_8(EIU_INTRPT_ACK);
-        dma1 = EISA_READ_8(EISA_DMA1_STATUS);
-        dma2 = EISA_READ_8(EISA_DMA2_STATUS);
-
-        if (eisa_irq >= EISA_MAX_IRQ) {
-                /* Oops, Bad Stuff Happened... */
-                printk(KERN_ERR "eisa_irq %d out of bound\n", eisa_irq);
+        eisa_irq = inb(EIU_INTRPT_ACK);
+        dma1 = inb(EISA_DMA1_STATUS);
+        dma2 = inb(EISA_DMA2_STATUS);
 
-                EISA_WRITE_8(EISA_INT2_CTRL, 0x20);
-                EISA_WRITE_8(EISA_INT1_CTRL, 0x20);
-        } else
+        if (eisa_irq < EISA_MAX_IRQ) {
                 do_IRQ(eisa_irq, regs);
+                return IRQ_HANDLED;
+        }
+
+        /* Oops, Bad Stuff Happened... */
+        printk(KERN_ERR "eisa_irq %d out of bound\n", eisa_irq);
+
+        outb(0x20, EISA_INT2_CTRL);
+        outb(0x20, EISA_INT1_CTRL);
+        return IRQ_NONE;
 }
 
 static void enable_eisa1_irq(unsigned int irq)
@@ -109,9 +100,9 @@ static void enable_eisa1_irq(unsigned int irq)
 
         local_irq_save(flags);
 
-        mask = EISA_READ_8(EISA_INT1_MASK);
+        mask = inb(EISA_INT1_MASK);
         mask &= ~((u8) (1 << irq));
-        EISA_WRITE_8(EISA_INT1_MASK, mask);
+        outb(mask, EISA_INT1_MASK);
 
         local_irq_restore(flags);
 }
@@ -122,9 +113,9 @@ static unsigned int startup_eisa1_irq(unsigned int irq)
 
         /* Only use edge interrupts for EISA */
 
-        edge = EISA_READ_8(EISA_INT1_EDGE_LEVEL);
+        edge = inb(EISA_INT1_EDGE_LEVEL);
         edge &= ~((u8) (1 << irq));
-        EISA_WRITE_8(EISA_INT1_EDGE_LEVEL, edge);
+        outb(edge, EISA_INT1_EDGE_LEVEL);
 
         enable_eisa1_irq(irq);
         return 0;
@@ -134,9 +125,9 @@ static void disable_eisa1_irq(unsigned int irq)
 {
         u8 mask;
 
-        mask = EISA_READ_8(EISA_INT1_MASK);
+        mask = inb(EISA_INT1_MASK);
         mask |= ((u8) (1 << irq));
-        EISA_WRITE_8(EISA_INT1_MASK, mask);
+        outb(mask, EISA_INT1_MASK);
 }
 
 #define shutdown_eisa1_irq      disable_eisa1_irq
@@ -145,7 +136,7 @@ static void mask_and_ack_eisa1_irq(unsigned int irq)
 {
         disable_eisa1_irq(irq);
 
-        EISA_WRITE_8(EISA_INT1_CTRL, 0x20);
+        outb(0x20, EISA_INT1_CTRL);
 }
 
 static void end_eisa1_irq(unsigned int irq)
@@ -171,9 +162,9 @@ static void enable_eisa2_irq(unsigned int irq)
 
         local_irq_save(flags);
 
-        mask = EISA_READ_8(EISA_INT2_MASK);
+        mask = inb(EISA_INT2_MASK);
         mask &= ~((u8) (1 << (irq - 8)));
-        EISA_WRITE_8(EISA_INT2_MASK, mask);
+        outb(mask, EISA_INT2_MASK);
 
         local_irq_restore(flags);
 }
@@ -184,9 +175,9 @@ static unsigned int startup_eisa2_irq(unsigned int irq)
 
         /* Only use edge interrupts for EISA */
 
-        edge = EISA_READ_8(EISA_INT2_EDGE_LEVEL);
+        edge = inb(EISA_INT2_EDGE_LEVEL);
         edge &= ~((u8) (1 << (irq - 8)));
-        EISA_WRITE_8(EISA_INT2_EDGE_LEVEL, edge);
+        outb(edge, EISA_INT2_EDGE_LEVEL);
 
         enable_eisa2_irq(irq);
         return 0;
@@ -196,9 +187,9 @@ static void disable_eisa2_irq(unsigned int irq)
 {
         u8 mask;
 
-        mask = EISA_READ_8(EISA_INT2_MASK);
+        mask = inb(EISA_INT2_MASK);
         mask |= ((u8) (1 << (irq - 8)));
-        EISA_WRITE_8(EISA_INT2_MASK, mask);
+        outb(mask, EISA_INT2_MASK);
 }
 
 #define shutdown_eisa2_irq      disable_eisa2_irq
@@ -207,8 +198,7 @@ static void mask_and_ack_eisa2_irq(unsigned int irq)
 {
         disable_eisa2_irq(irq);
 
-        EISA_WRITE_8(EISA_INT2_CTRL, 0x20);
-        EISA_WRITE_8(EISA_INT1_CTRL, 0x20);
+        outb(0x20, EISA_INT2_CTRL);
 }
 
 static void end_eisa2_irq(unsigned int irq)
@@ -241,7 +231,6 @@ int __init ip22_eisa_init(void)
 {
         int i, c;
         char *str;
-        u8 *slot_addr;
 
         if (!(sgimc->systemid & SGIMC_SYSID_EPRESENT)) {
                 printk(KERN_INFO "EISA: bus not present.\n");
@@ -249,11 +238,8 @@ int __init ip22_eisa_init(void)
         }
 
         printk(KERN_INFO "EISA: Probing bus...\n");
-        for (c = 0, i = 1; i <= EISA_MAX_SLOTS; i++) {
-                slot_addr =
-                    (u8 *) EISA_TO_KSEG1((0x1000 * i) +
-                                         EISA_VENDOR_ID_OFFSET);
-                if ((str = decode_eisa_sig(slot_addr))) {
+        for (c = 0, i = 1; i <= IP22_EISA_MAX_SLOTS; i++) {
+                if ((str = decode_eisa_sig(0x1000 * i + EISA_VENDOR_ID_OFFSET))) {
                         printk(KERN_INFO "EISA: slot %d : %s detected.\n",
                                i, str);
                         c++;
@@ -268,25 +254,25 @@ int __init ip22_eisa_init(void)
            Please wave your favorite dead chicken over the busses */
 
         /* First say hello to the EIU */
-        EIU_WRITE_32(EIU_PREMPT_REG, 0x0000FFFF);
-        EIU_WRITE_32(EIU_QUIET_REG, 1);
-        EIU_WRITE_32(EIU_MODE_REG, 0x40f3c07F);
+        outl(0x0000FFFF, EIU_PREMPT_REG);
+        outl(1, EIU_QUIET_REG);
+        outl(0x40f3c07F, EIU_MODE_REG);
 
         /* Now be nice to the EISA chipset */
-        EISA_WRITE_8(EISA_EXT_NMI_RESET_CTRL, 1);
-        for (i = 0; i < 10000; i++);    /* Wait long enough for the dust to settle */
-        EISA_WRITE_8(EISA_EXT_NMI_RESET_CTRL, 0);
-        EISA_WRITE_8(EISA_INT1_CTRL, 0x11);
-        EISA_WRITE_8(EISA_INT2_CTRL, 0x11);
-        EISA_WRITE_8(EISA_INT1_MASK, 0);
-        EISA_WRITE_8(EISA_INT2_MASK, 8);
-        EISA_WRITE_8(EISA_INT1_MASK, 4);
-        EISA_WRITE_8(EISA_INT2_MASK, 2);
-        EISA_WRITE_8(EISA_INT1_MASK, 1);
-        EISA_WRITE_8(EISA_INT2_MASK, 1);
-        EISA_WRITE_8(EISA_INT1_MASK, 0xfb);
-        EISA_WRITE_8(EISA_INT2_MASK, 0xff);
-        EISA_WRITE_8(EISA_DMA2_WRITE_SINGLE, 0);
+        outb(1, EISA_EXT_NMI_RESET_CTRL);
+        udelay(50);     /* Wait long enough for the dust to settle */
+        outb(0, EISA_EXT_NMI_RESET_CTRL);
+        outb(0x11, EISA_INT1_CTRL);
+        outb(0x11, EISA_INT2_CTRL);
+        outb(0, EISA_INT1_MASK);
+        outb(8, EISA_INT2_MASK);
+        outb(4, EISA_INT1_MASK);
+        outb(2, EISA_INT2_MASK);
+        outb(1, EISA_INT1_MASK);
+        outb(1, EISA_INT2_MASK);
+        outb(0xfb, EISA_INT1_MASK);
+        outb(0xff, EISA_INT2_MASK);
+        outb(0, EISA_DMA2_WRITE_SINGLE);
 
         for (i = SGINT_EISA; i < (SGINT_EISA + EISA_MAX_IRQ); i++) {
                 irq_desc[i].status = IRQ_DISABLED;