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332 lines
7.9 KiB
332 lines
7.9 KiB
/* |
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* arch/m68k/q40/q40ints.c |
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* |
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* Copyright (C) 1999,2001 Richard Zidlicky |
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* |
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* This file is subject to the terms and conditions of the GNU General Public |
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* License. See the file COPYING in the main directory of this archive |
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* for more details. |
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* |
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* .. used to be loosely based on bvme6000ints.c |
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* |
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*/ |
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#include <linux/types.h> |
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#include <linux/kernel.h> |
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#include <linux/errno.h> |
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#include <linux/interrupt.h> |
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#include <linux/irq.h> |
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#include <asm/machdep.h> |
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#include <asm/ptrace.h> |
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#include <asm/traps.h> |
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#include <asm/q40_master.h> |
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#include <asm/q40ints.h> |
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/* |
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* Q40 IRQs are defined as follows: |
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* 3,4,5,6,7,10,11,14,15 : ISA dev IRQs |
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* 16-31: reserved |
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* 32 : keyboard int |
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* 33 : frame int (50/200 Hz periodic timer) |
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* 34 : sample int (10/20 KHz periodic timer) |
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* |
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*/ |
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static void q40_irq_handler(unsigned int, struct pt_regs *fp); |
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static void q40_irq_enable(struct irq_data *data); |
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static void q40_irq_disable(struct irq_data *data); |
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unsigned short q40_ablecount[35]; |
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unsigned short q40_state[35]; |
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static unsigned int q40_irq_startup(struct irq_data *data) |
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{ |
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unsigned int irq = data->irq; |
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/* test for ISA ints not implemented by HW */ |
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switch (irq) { |
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case 1: case 2: case 8: case 9: |
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case 11: case 12: case 13: |
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pr_warn("%s: ISA IRQ %d not implemented by HW\n", __func__, |
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irq); |
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/* FIXME return -ENXIO; */ |
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} |
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return 0; |
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} |
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static void q40_irq_shutdown(struct irq_data *data) |
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{ |
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} |
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static struct irq_chip q40_irq_chip = { |
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.name = "q40", |
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.irq_startup = q40_irq_startup, |
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.irq_shutdown = q40_irq_shutdown, |
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.irq_enable = q40_irq_enable, |
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.irq_disable = q40_irq_disable, |
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}; |
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/* |
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* void q40_init_IRQ (void) |
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* |
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* Parameters: None |
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* |
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* Returns: Nothing |
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* |
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* This function is called during kernel startup to initialize |
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* the q40 IRQ handling routines. |
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*/ |
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static int disabled; |
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void __init q40_init_IRQ(void) |
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{ |
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m68k_setup_irq_controller(&q40_irq_chip, handle_simple_irq, 1, |
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Q40_IRQ_MAX); |
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/* setup handler for ISA ints */ |
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m68k_setup_auto_interrupt(q40_irq_handler); |
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m68k_irq_startup_irq(IRQ_AUTO_2); |
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m68k_irq_startup_irq(IRQ_AUTO_4); |
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/* now enable some ints.. */ |
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master_outb(1, EXT_ENABLE_REG); /* ISA IRQ 5-15 */ |
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/* make sure keyboard IRQ is disabled */ |
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master_outb(0, KEY_IRQ_ENABLE_REG); |
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} |
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/* |
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* this stuff doesn't really belong here.. |
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*/ |
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int ql_ticks; /* 200Hz ticks since last jiffie */ |
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static int sound_ticks; |
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#define SVOL 45 |
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void q40_mksound(unsigned int hz, unsigned int ticks) |
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{ |
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/* for now ignore hz, except that hz==0 switches off sound */ |
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/* simply alternate the ampl (128-SVOL)-(128+SVOL)-..-.. at 200Hz */ |
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if (hz == 0) { |
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if (sound_ticks) |
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sound_ticks = 1; |
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*DAC_LEFT = 128; |
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*DAC_RIGHT = 128; |
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return; |
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} |
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/* sound itself is done in q40_timer_int */ |
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if (sound_ticks == 0) |
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sound_ticks = 1000; /* pretty long beep */ |
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sound_ticks = ticks << 1; |
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} |
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static irqreturn_t q40_timer_int(int irq, void *dev_id) |
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{ |
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ql_ticks = ql_ticks ? 0 : 1; |
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if (sound_ticks) { |
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unsigned char sval=(sound_ticks & 1) ? 128-SVOL : 128+SVOL; |
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sound_ticks--; |
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*DAC_LEFT=sval; |
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*DAC_RIGHT=sval; |
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} |
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if (!ql_ticks) { |
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unsigned long flags; |
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local_irq_save(flags); |
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legacy_timer_tick(1); |
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timer_heartbeat(); |
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local_irq_restore(flags); |
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} |
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return IRQ_HANDLED; |
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} |
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void q40_sched_init (void) |
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{ |
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int timer_irq; |
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timer_irq = Q40_IRQ_FRAME; |
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if (request_irq(timer_irq, q40_timer_int, 0, "timer", NULL)) |
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panic("Couldn't register timer int"); |
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master_outb(-1, FRAME_CLEAR_REG); |
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master_outb( 1, FRAME_RATE_REG); |
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} |
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/* |
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* tables to translate bits into IRQ numbers |
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* it is a good idea to order the entries by priority |
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* |
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*/ |
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struct IRQ_TABLE{ unsigned mask; int irq ;}; |
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#if 0 |
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static struct IRQ_TABLE iirqs[]={ |
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{Q40_IRQ_FRAME_MASK,Q40_IRQ_FRAME}, |
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{Q40_IRQ_KEYB_MASK,Q40_IRQ_KEYBOARD}, |
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{0,0}}; |
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#endif |
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static struct IRQ_TABLE eirqs[] = { |
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{ .mask = Q40_IRQ3_MASK, .irq = 3 }, /* ser 1 */ |
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{ .mask = Q40_IRQ4_MASK, .irq = 4 }, /* ser 2 */ |
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{ .mask = Q40_IRQ14_MASK, .irq = 14 }, /* IDE 1 */ |
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{ .mask = Q40_IRQ15_MASK, .irq = 15 }, /* IDE 2 */ |
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{ .mask = Q40_IRQ6_MASK, .irq = 6 }, /* floppy, handled elsewhere */ |
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{ .mask = Q40_IRQ7_MASK, .irq = 7 }, /* par */ |
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{ .mask = Q40_IRQ5_MASK, .irq = 5 }, |
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{ .mask = Q40_IRQ10_MASK, .irq = 10 }, |
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{0,0} |
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}; |
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/* complain only this many times about spurious ints : */ |
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static int ccleirq=60; /* ISA dev IRQs*/ |
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/*static int cclirq=60;*/ /* internal */ |
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/* FIXME: add shared ints,mask,unmask,probing.... */ |
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#define IRQ_INPROGRESS 1 |
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/*static unsigned short saved_mask;*/ |
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//static int do_tint=0; |
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#define DEBUG_Q40INT |
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/*#define IP_USE_DISABLE *//* would be nice, but crashes ???? */ |
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static int mext_disabled=0; /* ext irq disabled by master chip? */ |
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static int aliased_irq=0; /* how many times inside handler ?*/ |
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/* got interrupt, dispatch to ISA or keyboard/timer IRQs */ |
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static void q40_irq_handler(unsigned int irq, struct pt_regs *fp) |
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{ |
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unsigned mir, mer; |
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int i; |
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//repeat: |
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mir = master_inb(IIRQ_REG); |
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#ifdef CONFIG_BLK_DEV_FD |
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if ((mir & Q40_IRQ_EXT_MASK) && |
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(master_inb(EIRQ_REG) & Q40_IRQ6_MASK)) { |
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floppy_hardint(); |
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return; |
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} |
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#endif |
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switch (irq) { |
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case 4: |
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case 6: |
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do_IRQ(Q40_IRQ_SAMPLE, fp); |
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return; |
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} |
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if (mir & Q40_IRQ_FRAME_MASK) { |
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do_IRQ(Q40_IRQ_FRAME, fp); |
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master_outb(-1, FRAME_CLEAR_REG); |
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} |
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if ((mir & Q40_IRQ_SER_MASK) || (mir & Q40_IRQ_EXT_MASK)) { |
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mer = master_inb(EIRQ_REG); |
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for (i = 0; eirqs[i].mask; i++) { |
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if (mer & eirqs[i].mask) { |
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irq = eirqs[i].irq; |
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/* |
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* There is a little mess wrt which IRQ really caused this irq request. The |
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* main problem is that IIRQ_REG and EIRQ_REG reflect the state when they |
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* are read - which is long after the request came in. In theory IRQs should |
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* not just go away but they occasionally do |
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*/ |
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if (irq > 4 && irq <= 15 && mext_disabled) { |
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/*aliased_irq++;*/ |
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goto iirq; |
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} |
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if (q40_state[irq] & IRQ_INPROGRESS) { |
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/* some handlers do local_irq_enable() for irq latency reasons, */ |
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/* however reentering an active irq handler is not permitted */ |
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#ifdef IP_USE_DISABLE |
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/* in theory this is the better way to do it because it still */ |
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/* lets through eg the serial irqs, unfortunately it crashes */ |
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disable_irq(irq); |
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disabled = 1; |
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#else |
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/*pr_warn("IRQ_INPROGRESS detected for irq %d, disabling - %s disabled\n", |
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irq, disabled ? "already" : "not yet"); */ |
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fp->sr = (((fp->sr) & (~0x700))+0x200); |
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disabled = 1; |
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#endif |
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goto iirq; |
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} |
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q40_state[irq] |= IRQ_INPROGRESS; |
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do_IRQ(irq, fp); |
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q40_state[irq] &= ~IRQ_INPROGRESS; |
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/* naively enable everything, if that fails than */ |
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/* this function will be reentered immediately thus */ |
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/* getting another chance to disable the IRQ */ |
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if (disabled) { |
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#ifdef IP_USE_DISABLE |
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if (irq > 4) { |
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disabled = 0; |
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enable_irq(irq); |
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} |
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#else |
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disabled = 0; |
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/*pr_info("reenabling irq %d\n", irq); */ |
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#endif |
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} |
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// used to do 'goto repeat;' here, this delayed bh processing too long |
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return; |
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} |
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} |
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if (mer && ccleirq > 0 && !aliased_irq) { |
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pr_warn("ISA interrupt from unknown source? EIRQ_REG = %x\n", |
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mer); |
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ccleirq--; |
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} |
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} |
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iirq: |
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mir = master_inb(IIRQ_REG); |
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/* should test whether keyboard irq is really enabled, doing it in defhand */ |
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if (mir & Q40_IRQ_KEYB_MASK) |
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do_IRQ(Q40_IRQ_KEYBOARD, fp); |
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return; |
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} |
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void q40_irq_enable(struct irq_data *data) |
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{ |
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unsigned int irq = data->irq; |
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if (irq >= 5 && irq <= 15) { |
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mext_disabled--; |
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if (mext_disabled > 0) |
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pr_warn("q40_irq_enable : nested disable/enable\n"); |
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if (mext_disabled == 0) |
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master_outb(1, EXT_ENABLE_REG); |
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} |
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} |
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void q40_irq_disable(struct irq_data *data) |
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{ |
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unsigned int irq = data->irq; |
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/* disable ISA iqs : only do something if the driver has been |
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* verified to be Q40 "compatible" - right now IDE, NE2K |
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* Any driver should not attempt to sleep across disable_irq !! |
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*/ |
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if (irq >= 5 && irq <= 15) { |
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master_outb(0, EXT_ENABLE_REG); |
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mext_disabled++; |
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if (mext_disabled > 1) |
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pr_info("disable_irq nesting count %d\n", |
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mext_disabled); |
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} |
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}
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