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-rw-r--r--arch/sh/boards/bigsur/irq.c348
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
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+++ b/arch/sh/boards/bigsur/irq.c
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+/*
+ *
+ * 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);
+
+}
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