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Diffstat (limited to 'arch/mips/sgi-ip22/ip22-eisa.c')
-rw-r--r--arch/mips/sgi-ip22/ip22-eisa.c253
1 files changed, 45 insertions, 208 deletions
diff --git a/arch/mips/sgi-ip22/ip22-eisa.c b/arch/mips/sgi-ip22/ip22-eisa.c
index 0ab4abf65d5..a0a79222ce0 100644
--- a/arch/mips/sgi-ip22/ip22-eisa.c
+++ b/arch/mips/sgi-ip22/ip22-eisa.c
@@ -2,7 +2,7 @@
* Basic EISA bus support for the SGI Indigo-2.
*
* (C) 2002 Pascal Dameme <netinet@freesurf.fr>
- * and Marc Zyngier <mzyngier@freesurf.fr>
+ * and Marc Zyngier <mzyngier@freesurf.fr>
*
* This code is released under both the GPL version 2 and BSD
* licenses. Either license may be used.
@@ -19,7 +19,6 @@
* - Fix more bugs.
*/
-#include <linux/config.h>
#include <linux/eisa.h>
#include <linux/types.h>
#include <linux/init.h>
@@ -29,6 +28,7 @@
#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>
@@ -36,43 +36,31 @@
#include <asm/sgi/ioc.h>
#include <asm/sgi/mc.h>
#include <asm/sgi/ip22.h>
+#include <asm/i8259.h>
-#define EISA_MAX_SLOTS 4
-#define EISA_MAX_IRQ 16
+/* 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 0x0001ffc0
+#define EIU_STAT_REG 0x0001ffc4
+#define EIU_PREMPT_REG 0x0001ffc8
+#define EIU_QUIET_REG 0x0001ffcc
+#define EIU_INTRPT_ACK 0x00010004
-#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)
+static char __init *decode_eisa_sig(unsigned long addr)
{
- static char sig_str[8];
+ static char sig_str[EISA_SIG_LEN] __initdata;
+ 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);
@@ -83,177 +71,45 @@ static char *decode_eisa_sig(u8 * sig)
return sig_str;
}
-static void 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_WRITE_8(EISA_INT2_CTRL, 0x20);
- EISA_WRITE_8(EISA_INT1_CTRL, 0x20);
- } else
- do_IRQ(eisa_irq, regs);
-}
-
-static void enable_eisa1_irq(unsigned int irq)
-{
- unsigned long flags;
- u8 mask;
-
- local_irq_save(flags);
-
- mask = EISA_READ_8(EISA_INT1_MASK);
- mask &= ~((u8) (1 << irq));
- EISA_WRITE_8(EISA_INT1_MASK, mask);
-
- local_irq_restore(flags);
-}
-
-static unsigned int startup_eisa1_irq(unsigned int irq)
-{
- u8 edge;
-
- /* Only use edge interrupts for EISA */
-
- edge = EISA_READ_8(EISA_INT1_EDGE_LEVEL);
- edge &= ~((u8) (1 << irq));
- EISA_WRITE_8(EISA_INT1_EDGE_LEVEL, edge);
-
- enable_eisa1_irq(irq);
- return 0;
-}
-
-static void disable_eisa1_irq(unsigned int irq)
-{
- u8 mask;
-
- mask = EISA_READ_8(EISA_INT1_MASK);
- mask |= ((u8) (1 << irq));
- EISA_WRITE_8(EISA_INT1_MASK, mask);
-}
-
-#define shutdown_eisa1_irq disable_eisa1_irq
-
-static void mask_and_ack_eisa1_irq(unsigned int irq)
-{
- disable_eisa1_irq(irq);
-
- EISA_WRITE_8(EISA_INT1_CTRL, 0x20);
-}
-
-static void end_eisa1_irq(unsigned int irq)
-{
- if (!(irq_desc[irq].status & (IRQ_DISABLED | IRQ_INPROGRESS)))
- enable_eisa1_irq(irq);
-}
-
-static struct hw_interrupt_type ip22_eisa1_irq_type = {
- .typename = "IP22 EISA",
- .startup = startup_eisa1_irq,
- .shutdown = shutdown_eisa1_irq,
- .enable = enable_eisa1_irq,
- .disable = disable_eisa1_irq,
- .ack = mask_and_ack_eisa1_irq,
- .end = end_eisa1_irq,
-};
-
-static void enable_eisa2_irq(unsigned int irq)
-{
- unsigned long flags;
- u8 mask;
-
- local_irq_save(flags);
-
- mask = EISA_READ_8(EISA_INT2_MASK);
- mask &= ~((u8) (1 << (irq - 8)));
- EISA_WRITE_8(EISA_INT2_MASK, mask);
-
- local_irq_restore(flags);
-}
-
-static unsigned int startup_eisa2_irq(unsigned int irq)
+static irqreturn_t ip22_eisa_intr(int irq, void *dev_id)
{
- u8 edge;
-
- /* Only use edge interrupts for EISA */
+ u8 eisa_irq = inb(EIU_INTRPT_ACK);
- edge = EISA_READ_8(EISA_INT2_EDGE_LEVEL);
- edge &= ~((u8) (1 << (irq - 8)));
- EISA_WRITE_8(EISA_INT2_EDGE_LEVEL, edge);
+ inb(EISA_DMA1_STATUS);
+ inb(EISA_DMA2_STATUS);
- enable_eisa2_irq(irq);
- return 0;
-}
-
-static void disable_eisa2_irq(unsigned int irq)
-{
- u8 mask;
-
- mask = EISA_READ_8(EISA_INT2_MASK);
- mask |= ((u8) (1 << (irq - 8)));
- EISA_WRITE_8(EISA_INT2_MASK, mask);
-}
+ if (eisa_irq < EISA_MAX_IRQ) {
+ do_IRQ(eisa_irq);
+ return IRQ_HANDLED;
+ }
-#define shutdown_eisa2_irq disable_eisa2_irq
+ /* Oops, Bad Stuff Happened... */
+ printk(KERN_ERR "eisa_irq %d out of bound\n", eisa_irq);
-static void mask_and_ack_eisa2_irq(unsigned int irq)
-{
- disable_eisa2_irq(irq);
+ outb(0x20, EISA_INT2_CTRL);
+ outb(0x20, EISA_INT1_CTRL);
- EISA_WRITE_8(EISA_INT2_CTRL, 0x20);
- EISA_WRITE_8(EISA_INT1_CTRL, 0x20);
+ return IRQ_NONE;
}
-static void end_eisa2_irq(unsigned int irq)
-{
- if (!(irq_desc[irq].status & (IRQ_DISABLED | IRQ_INPROGRESS)))
- enable_eisa2_irq(irq);
-}
-
-static struct hw_interrupt_type ip22_eisa2_irq_type = {
- .typename = "IP22 EISA",
- .startup = startup_eisa2_irq,
- .shutdown = shutdown_eisa2_irq,
- .enable = enable_eisa2_irq,
- .disable = disable_eisa2_irq,
- .ack = mask_and_ack_eisa2_irq,
- .end = end_eisa2_irq,
-};
-
static struct irqaction eisa_action = {
.handler = ip22_eisa_intr,
.name = "EISA",
};
-static struct irqaction cascade_action = {
- .handler = no_action,
- .name = "EISA cascade",
-};
-
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");
return 1;
}
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++;
@@ -268,40 +124,21 @@ 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(0, EISA_DMA2_WRITE_SINGLE);
- for (i = SGINT_EISA; i < (SGINT_EISA + EISA_MAX_IRQ); i++) {
- irq_desc[i].status = IRQ_DISABLED;
- irq_desc[i].action = 0;
- irq_desc[i].depth = 1;
- if (i < (SGINT_EISA + 8))
- irq_desc[i].handler = &ip22_eisa1_irq_type;
- else
- irq_desc[i].handler = &ip22_eisa2_irq_type;
- }
+ init_i8259_irqs();
/* Cannot use request_irq because of kmalloc not being ready at such
* an early stage. Yes, I've been bitten... */
setup_irq(SGI_EISA_IRQ, &eisa_action);
- setup_irq(SGINT_EISA + 2, &cascade_action);
EISA_bus = 1;
return 0;
generated by cgit v1.2.3-70-g09d2 (git 2.46.0) at 2025-12-15 02:09:06 +0000