1 files changed, 348 insertions, 0 deletions

diff --git a/arch/sh/boards/bigsur/irq.c b/arch/sh/boards/bigsur/irq.c
new file mode 100644
index 000000000000..c188fc32dc9a
--- /dev/null
+++ b/arch/sh/boards/bigsur/irq.c
@@ -0,0 +1,348 @@
+/*
+ *
+ * By Dustin McIntire (dustin@sensoria.com) (c)2001
+ *
+ * Setup and IRQ handling code for the HD64465 companion chip.
+ * by Greg Banks <gbanks@pocketpenguins.com>
+ * Copyright (c) 2000 PocketPenguins Inc
+ *
+ * Derived from setup_hd64465.c which bore the message:
+ * Greg Banks <gbanks@pocketpenguins.com>
+ * Copyright (c) 2000 PocketPenguins Inc and
+ * Copyright (C) 2000 YAEGASHI Takeshi
+ * and setup_cqreek.c which bore message:
+ * Copyright (C) 2000  Niibe Yutaka
+ *
+ * May be copied or modified under the terms of the GNU General Public
+ * License.  See linux/COPYING for more information.
+ *
+ * IRQ functions for a Hitachi Big Sur Evaluation Board.
+ *
+ */
+
+#include <linux/config.h>
+#include <linux/sched.h>
+#include <linux/module.h>
+#include <linux/kernel.h>
+#include <linux/param.h>
+#include <linux/ioport.h>
+#include <linux/interrupt.h>
+#include <linux/init.h>
+#include <linux/irq.h>
+#include <linux/bitops.h>
+
+#include <asm/io.h>
+#include <asm/irq.h>
+
+#include <asm/bigsur/io.h>
+#include <asm/hd64465/hd64465.h>
+#include <asm/bigsur/bigsur.h>
+
+//#define BIGSUR_DEBUG 3
+#undef BIGSUR_DEBUG
+
+#ifdef BIGSUR_DEBUG
+#define DPRINTK(args...)        printk(args)
+#define DIPRINTK(n, args...)    if (BIGSUR_DEBUG>(n)) printk(args)
+#else
+#define DPRINTK(args...)
+#define DIPRINTK(n, args...)
+#endif /* BIGSUR_DEBUG */
+
+#ifdef CONFIG_HD64465
+extern int hd64465_irq_demux(int irq);
+#endif /* CONFIG_HD64465 */
+
+
+/*===========================================================*/
+//              Big Sur CPLD IRQ Routines
+/*===========================================================*/
+
+/* Level 1 IRQ routines */
+static void disable_bigsur_l1irq(unsigned int irq)
+{
+        unsigned long flags;
+        unsigned char mask;
+        unsigned int mask_port = ((irq - BIGSUR_IRQ_LOW)/8) ? BIGSUR_IRLMR1 : BIGSUR_IRLMR0;
+        unsigned char bit =  (1 << ((irq - MGATE_IRQ_LOW)%8) );
+
+        if(irq >= BIGSUR_IRQ_LOW && irq < BIGSUR_IRQ_HIGH) {
+                DPRINTK("Disable L1 IRQ %d\n", irq);
+                DIPRINTK(2,"disable_bigsur_l1irq: IMR=0x%08x mask=0x%x\n",
+                        mask_port, bit);
+                local_irq_save(flags);
+
+                /* Disable IRQ - set mask bit */
+                mask = inb(mask_port) | bit;
+                outb(mask, mask_port);
+                local_irq_restore(flags);
+                return;
+        }
+        DPRINTK("disable_bigsur_l1irq: Invalid IRQ %d\n", irq);
+}
+
+static void enable_bigsur_l1irq(unsigned int irq)
+{
+        unsigned long flags;
+        unsigned char mask;
+        unsigned int mask_port = ((irq - BIGSUR_IRQ_LOW)/8) ? BIGSUR_IRLMR1 : BIGSUR_IRLMR0;
+        unsigned char bit =  (1 << ((irq - MGATE_IRQ_LOW)%8) );
+
+        if(irq >= BIGSUR_IRQ_LOW && irq < BIGSUR_IRQ_HIGH) {
+                DPRINTK("Enable L1 IRQ %d\n", irq);
+                DIPRINTK(2,"enable_bigsur_l1irq: IMR=0x%08x mask=0x%x\n",
+                        mask_port, bit);
+                local_irq_save(flags);
+                /* Enable L1 IRQ - clear mask bit */
+                mask = inb(mask_port) & ~bit;
+                outb(mask, mask_port);
+                local_irq_restore(flags);
+                return;
+        }
+        DPRINTK("enable_bigsur_l1irq: Invalid IRQ %d\n", irq);
+}
+
+
+/* Level 2 irq masks and registers for L2 decoding */
+/* Level2 bitmasks for each level 1 IRQ */
+const u32 bigsur_l2irq_mask[] =
+    {0x40,0x80,0x08,0x01,0x01,0x3C,0x3E,0xFF,0x40,0x80,0x06,0x03};
+/* Level2 to ISR[n] map for each level 1 IRQ */
+const u32 bigsur_l2irq_reg[]  =
+    {   2,   2,   3,   3,   1,   2,   1,   0,   1,   1,   3,   2};
+/* Level2 to Level 1 IRQ map */
+const u32 bigsur_l2_l1_map[]  =
+    {7,7,7,7,7,7,7,7, 4,6,6,6,6,6,8,9, 11,11,5,5,5,5,0,1, 3,10,10,2,-1,-1,-1,-1};
+/* IRQ inactive level (high or low) */
+const u32 bigsur_l2_inactv_state[]  =   {0x00, 0xBE, 0xFC, 0xF7};
+
+/* CPLD external status and mask registers base and offsets */
+static const u32 isr_base = BIGSUR_IRQ0;
+static const u32 isr_offset = BIGSUR_IRQ0 - BIGSUR_IRQ1;
+static const u32 imr_base = BIGSUR_IMR0;
+static const u32 imr_offset = BIGSUR_IMR0 - BIGSUR_IMR1;
+
+#define REG_NUM(irq)  ((irq-BIGSUR_2NDLVL_IRQ_LOW)/8 )
+
+/* Level 2 IRQ routines */
+static void disable_bigsur_l2irq(unsigned int irq)
+{
+        unsigned long flags;
+        unsigned char mask;
+        unsigned char bit = 1 << ((irq-BIGSUR_2NDLVL_IRQ_LOW)%8);
+        unsigned int mask_port = imr_base - REG_NUM(irq)*imr_offset;
+
+    if(irq >= BIGSUR_2NDLVL_IRQ_LOW && irq < BIGSUR_2NDLVL_IRQ_HIGH) {
+                DPRINTK("Disable L2 IRQ %d\n", irq);
+                DIPRINTK(2,"disable_bigsur_l2irq: IMR=0x%08x mask=0x%x\n",
+                        mask_port, bit);
+                local_irq_save(flags);
+
+                /* Disable L2 IRQ - set mask bit */
+                mask = inb(mask_port) | bit;
+                outb(mask, mask_port);
+                local_irq_restore(flags);
+                return;
+        }
+        DPRINTK("disable_bigsur_l2irq: Invalid IRQ %d\n", irq);
+}
+
+static void enable_bigsur_l2irq(unsigned int irq)
+{
+        unsigned long flags;
+        unsigned char mask;
+        unsigned char bit = 1 << ((irq-BIGSUR_2NDLVL_IRQ_LOW)%8);
+        unsigned int mask_port = imr_base - REG_NUM(irq)*imr_offset;
+
+    if(irq >= BIGSUR_2NDLVL_IRQ_LOW && irq < BIGSUR_2NDLVL_IRQ_HIGH) {
+                DPRINTK("Enable L2 IRQ %d\n", irq);
+                DIPRINTK(2,"enable_bigsur_l2irq: IMR=0x%08x mask=0x%x\n",
+                        mask_port, bit);
+                local_irq_save(flags);
+
+                /* Enable L2 IRQ - clear mask bit */
+                mask = inb(mask_port) & ~bit;
+                outb(mask, mask_port);
+                local_irq_restore(flags);
+                return;
+        }
+        DPRINTK("enable_bigsur_l2irq: Invalid IRQ %d\n", irq);
+}
+
+static void mask_and_ack_bigsur(unsigned int irq)
+{
+        DPRINTK("mask_and_ack_bigsur IRQ %d\n", irq);
+        if(irq >= BIGSUR_IRQ_LOW && irq < BIGSUR_IRQ_HIGH)
+                disable_bigsur_l1irq(irq);
+        else
+                disable_bigsur_l2irq(irq);
+}
+
+static void end_bigsur_irq(unsigned int irq)
+{
+        DPRINTK("end_bigsur_irq IRQ %d\n", irq);
+        if (!(irq_desc[irq].status & (IRQ_DISABLED|IRQ_INPROGRESS))) {
+                if(irq >= BIGSUR_IRQ_LOW && irq < BIGSUR_IRQ_HIGH)
+                        enable_bigsur_l1irq(irq);
+                else
+                        enable_bigsur_l2irq(irq);
+        }
+}
+
+static unsigned int startup_bigsur_irq(unsigned int irq)
+{
+        u8 mask;
+        u32 reg;
+
+        DPRINTK("startup_bigsur_irq IRQ %d\n", irq);
+
+        if(irq >= BIGSUR_IRQ_LOW && irq < BIGSUR_IRQ_HIGH) {
+                /* Enable the L1 IRQ */
+                enable_bigsur_l1irq(irq);
+                /* Enable all L2 IRQs in this L1 IRQ */
+                mask = ~(bigsur_l2irq_mask[irq-BIGSUR_IRQ_LOW]);
+                reg = imr_base - bigsur_l2irq_reg[irq-BIGSUR_IRQ_LOW] * imr_offset;
+                mask &= inb(reg);
+                outb(mask,reg);
+                DIPRINTK(2,"startup_bigsur_irq: IMR=0x%08x mask=0x%x\n",reg,inb(reg));
+        }
+        else {
+                /* Enable the L2 IRQ - clear mask bit */
+                enable_bigsur_l2irq(irq);
+                /* Enable the L1 bit masking this L2 IRQ */
+                enable_bigsur_l1irq(bigsur_l2_l1_map[irq-BIGSUR_2NDLVL_IRQ_LOW]);
+                DIPRINTK(2,"startup_bigsur_irq: L1=%d L2=%d\n",
+                        bigsur_l2_l1_map[irq-BIGSUR_2NDLVL_IRQ_LOW],irq);
+        }
+        return 0;
+}
+
+static void shutdown_bigsur_irq(unsigned int irq)
+{
+        DPRINTK("shutdown_bigsur_irq IRQ %d\n", irq);
+        if(irq >= BIGSUR_IRQ_LOW && irq < BIGSUR_IRQ_HIGH)
+                disable_bigsur_l1irq(irq);
+        else
+                disable_bigsur_l2irq(irq);
+}
+
+/* Define the IRQ structures for the L1 and L2 IRQ types */
+static struct hw_interrupt_type bigsur_l1irq_type = {
+        "BigSur-CPLD-Level1-IRQ",
+        startup_bigsur_irq,
+        shutdown_bigsur_irq,
+        enable_bigsur_l1irq,
+        disable_bigsur_l1irq,
+        mask_and_ack_bigsur,
+        end_bigsur_irq
+};
+
+static struct hw_interrupt_type bigsur_l2irq_type = {
+        "BigSur-CPLD-Level2-IRQ",
+        startup_bigsur_irq,
+        shutdown_bigsur_irq,
+        enable_bigsur_l2irq,
+        disable_bigsur_l2irq,
+        mask_and_ack_bigsur,
+        end_bigsur_irq
+};
+
+
+static void make_bigsur_l1isr(unsigned int irq) {
+
+        /* sanity check first */
+        if(irq >= BIGSUR_IRQ_LOW && irq < BIGSUR_IRQ_HIGH) {
+                /* save the handler in the main description table */
+                irq_desc[irq].handler = &bigsur_l1irq_type;
+                irq_desc[irq].status = IRQ_DISABLED;
+                irq_desc[irq].action = 0;
+                irq_desc[irq].depth = 1;
+
+                disable_bigsur_l1irq(irq);
+                return;
+        }
+        DPRINTK("make_bigsur_l1isr: bad irq, %d\n", irq);
+        return;
+}
+
+static void make_bigsur_l2isr(unsigned int irq) {
+
+        /* sanity check first */
+        if(irq >= BIGSUR_2NDLVL_IRQ_LOW && irq < BIGSUR_2NDLVL_IRQ_HIGH) {
+                /* save the handler in the main description table */
+                irq_desc[irq].handler = &bigsur_l2irq_type;
+                irq_desc[irq].status = IRQ_DISABLED;
+                irq_desc[irq].action = 0;
+                irq_desc[irq].depth = 1;
+
+                disable_bigsur_l2irq(irq);
+                return;
+        }
+        DPRINTK("make_bigsur_l2isr: bad irq, %d\n", irq);
+        return;
+}
+
+/* The IRQ's will be decoded as follows:
+ * If a level 2 handler exists and there is an unmasked active
+ * IRQ, the 2nd level handler will be called.
+ * If a level 2 handler does not exist for the active IRQ
+ * the 1st level handler will be called.
+ */
+
+int bigsur_irq_demux(int irq)
+{
+        int dmux_irq = irq;
+        u8 mask, actv_irqs;
+        u32 reg_num;
+
+        DIPRINTK(3,"bigsur_irq_demux, irq=%d\n", irq);
+        /* decode the 1st level IRQ */
+        if(irq >= BIGSUR_IRQ_LOW && irq < BIGSUR_IRQ_HIGH) {
+                /* Get corresponding L2 ISR bitmask and ISR number */
+                mask = bigsur_l2irq_mask[irq-BIGSUR_IRQ_LOW];
+                reg_num = bigsur_l2irq_reg[irq-BIGSUR_IRQ_LOW];
+                /* find the active IRQ's (XOR with inactive level)*/
+                actv_irqs = inb(isr_base-reg_num*isr_offset) ^
+                                        bigsur_l2_inactv_state[reg_num];
+                /* decode active IRQ's */
+                actv_irqs = actv_irqs & mask & ~(inb(imr_base-reg_num*imr_offset));
+                /* if NEZ then we have an active L2 IRQ */
+                if(actv_irqs) dmux_irq = ffz(~actv_irqs) + reg_num*8+BIGSUR_2NDLVL_IRQ_LOW;
+                /* if no 2nd level IRQ action, but has 1st level, use 1st level handler */
+                if(!irq_desc[dmux_irq].action && irq_desc[irq].action)
+                        dmux_irq = irq;
+                DIPRINTK(1,"bigsur_irq_demux: irq=%d dmux_irq=%d mask=0x%04x reg=%d\n",
+                        irq, dmux_irq, mask, reg_num);
+        }
+#ifdef CONFIG_HD64465
+        dmux_irq = hd64465_irq_demux(dmux_irq);
+#endif /* CONFIG_HD64465 */
+        DIPRINTK(3,"bigsur_irq_demux, demux_irq=%d\n", dmux_irq);
+
+        return dmux_irq;
+}
+
+/*===========================================================*/
+//              Big Sur Init Routines
+/*===========================================================*/
+void __init init_bigsur_IRQ(void)
+{
+        int i;
+
+        if (!MACH_BIGSUR) return;
+
+        /* Create ISR's for Big Sur CPLD IRQ's */
+        /*==============================================================*/
+        for(i=BIGSUR_IRQ_LOW;i<BIGSUR_IRQ_HIGH;i++)
+                make_bigsur_l1isr(i);
+
+        printk(KERN_INFO "Big Sur CPLD L1 interrupts %d to %d.\n",
+                BIGSUR_IRQ_LOW,BIGSUR_IRQ_HIGH);
+
+        for(i=BIGSUR_2NDLVL_IRQ_LOW;i<BIGSUR_2NDLVL_IRQ_HIGH;i++)
+                make_bigsur_l2isr(i);
+
+        printk(KERN_INFO "Big Sur CPLD L2 interrupts %d to %d.\n",
+                BIGSUR_2NDLVL_IRQ_LOW,BIGSUR_2NDLVL_IRQ_HIGH);
+
+}