setup_bigsur.c
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上传日期:2013-02-24
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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.
- *
- * Setup and 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 <asm/io.h>
- #include <asm/irq.h>
- #include <asm/bitops.h>
- #include <asm/io_bigsur.h>
- #include <asm/hd64465.h>
- #include <asm/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 %dn", irq);
- DIPRINTK(2,"disable_bigsur_l1irq: IMR=0x%08x mask=0x%xn",
- mask_port, bit);
- save_and_cli(flags);
- /* Disable IRQ - set mask bit */
- mask = inb(mask_port) | bit;
- outb(mask, mask_port);
- restore_flags(flags);
- return;
- }
- DPRINTK("disable_bigsur_l1irq: Invalid IRQ %dn", 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 %dn", irq);
- DIPRINTK(2,"enable_bigsur_l1irq: IMR=0x%08x mask=0x%xn",
- mask_port, bit);
- save_and_cli(flags);
- /* Enable L1 IRQ - clear mask bit */
- mask = inb(mask_port) & ~bit;
- outb(mask, mask_port);
- restore_flags(flags);
- return;
- }
- DPRINTK("enable_bigsur_l1irq: Invalid IRQ %dn", 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 %dn", irq);
- DIPRINTK(2,"disable_bigsur_l2irq: IMR=0x%08x mask=0x%xn",
- mask_port, bit);
- save_and_cli(flags);
- /* Disable L2 IRQ - set mask bit */
- mask = inb(mask_port) | bit;
- outb(mask, mask_port);
- restore_flags(flags);
- return;
- }
- DPRINTK("disable_bigsur_l2irq: Invalid IRQ %dn", 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 %dn", irq);
- DIPRINTK(2,"enable_bigsur_l2irq: IMR=0x%08x mask=0x%xn",
- mask_port, bit);
- save_and_cli(flags);
- /* Enable L2 IRQ - clear mask bit */
- mask = inb(mask_port) & ~bit;
- outb(mask, mask_port);
- restore_flags(flags);
- return;
- }
- DPRINTK("enable_bigsur_l2irq: Invalid IRQ %dn", irq);
- }
- static void mask_and_ack_bigsur(unsigned int irq)
- {
- DPRINTK("mask_and_ack_bigsur IRQ %dn", 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 %dn", 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 %dn", 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%xn",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=%dn",
- 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 %dn", 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, %dn", 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, %dn", 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=%dn", 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=%dn",
- 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=%dn", 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);
- }
- int __init setup_bigsur(void)
- {
- static int done = 0; /* run this only once */
- if (!MACH_BIGSUR || done) return 0;
- done = 1;
- /* Mask all 2nd level IRQ's */
- outb(-1,BIGSUR_IMR0);
- outb(-1,BIGSUR_IMR1);
- outb(-1,BIGSUR_IMR2);
- outb(-1,BIGSUR_IMR3);
- /* Mask 1st level interrupts */
- outb(-1,BIGSUR_IRLMR0);
- outb(-1,BIGSUR_IRLMR1);
- #if defined (CONFIG_HD64465) && defined (CONFIG_SERIAL)
- /* remap IO ports for first ISA serial port to HD64465 UART */
- bigsur_port_map(0x3f8, 8, CONFIG_HD64465_IOBASE + 0x8000, 1);
- #endif /* CONFIG_HD64465 && CONFIG_SERIAL */
- /* TODO: setup IDE registers */
- bigsur_port_map(BIGSUR_IDECTL_IOPORT, 2, BIGSUR_ICTL, 8);
- /* Setup the Ethernet port to BIGSUR_ETHER_IOPORT */
- bigsur_port_map(BIGSUR_ETHER_IOPORT, 16, BIGSUR_ETHR+BIGSUR_ETHER_IOPORT, 0);
- /* set page to 1 */
- outw(1, BIGSUR_ETHR+0xe);
- /* set the IO port to BIGSUR_ETHER_IOPORT */
- outw(BIGSUR_ETHER_IOPORT<<3, BIGSUR_ETHR+0x2);
- return 0;
- }
- module_init(setup_bigsur);