Linux-2.6.12-rc2
Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
This commit is contained in:
Linus Torvalds
476
arch/m68k/q40/q40ints.c
Normal file
476
arch/m68k/q40/q40ints.c
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@@ -0,0 +1,476 @@
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/*
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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/string.h>
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#include <linux/sched.h>
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#include <linux/seq_file.h>
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#include <linux/interrupt.h>
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#include <linux/hardirq.h>
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#include <asm/rtc.h>
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#include <asm/ptrace.h>
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#include <asm/system.h>
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#include <asm/irq.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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extern int ints_inited;
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irqreturn_t q40_irq2_handler (int, void *, struct pt_regs *fp);
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static irqreturn_t q40_defhand (int irq, void *dev_id, struct pt_regs *fp);
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static irqreturn_t default_handler(int lev, void *dev_id, struct pt_regs *regs);
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#define DEVNAME_SIZE 24
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static struct q40_irq_node {
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irqreturn_t (*handler)(int, void *, struct pt_regs *);
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unsigned long flags;
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void *dev_id;
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/* struct q40_irq_node *next;*/
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char devname[DEVNAME_SIZE];
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unsigned count;
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unsigned short state;
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} irq_tab[Q40_IRQ_MAX+1];
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short unsigned q40_ablecount[Q40_IRQ_MAX+1];
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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=0;
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void q40_init_IRQ (void)
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{
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int i;
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disabled=0;
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for (i = 0; i <= Q40_IRQ_MAX; i++) {
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irq_tab[i].handler = q40_defhand;
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irq_tab[i].flags = 0;
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irq_tab[i].dev_id = NULL;
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/* irq_tab[i].next = NULL;*/
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irq_tab[i].devname[0] = 0;
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irq_tab[i].count = 0;
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irq_tab[i].state =0;
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q40_ablecount[i]=0; /* all enabled */
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}
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/* setup handler for ISA ints */
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cpu_request_irq(IRQ2, q40_irq2_handler, 0, "q40 ISA and master chip",
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NULL);
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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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int q40_request_irq(unsigned int irq,
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irqreturn_t (*handler)(int, void *, struct pt_regs *),
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unsigned long flags, const char *devname, void *dev_id)
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{
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/*printk("q40_request_irq %d, %s\n",irq,devname);*/
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if (irq > Q40_IRQ_MAX || (irq>15 && irq<32)) {
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printk("%s: Incorrect IRQ %d from %s\n", __FUNCTION__, irq, devname);
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return -ENXIO;
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}
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/* test for ISA ints not implemented by HW */
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switch (irq)
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{
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case 1: case 2: case 8: case 9:
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case 12: case 13:
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printk("%s: ISA IRQ %d from %s not implemented by HW\n", __FUNCTION__, irq, devname);
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return -ENXIO;
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case 11:
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printk("warning IRQ 10 and 11 not distinguishable\n");
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irq=10;
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default:
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;
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}
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if (irq<Q40_IRQ_SAMPLE)
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{
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if (irq_tab[irq].dev_id != NULL)
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{
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printk("%s: IRQ %d from %s is not replaceable\n",
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__FUNCTION__, irq, irq_tab[irq].devname);
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return -EBUSY;
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}
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/*printk("IRQ %d set to handler %p\n",irq,handler);*/
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if (dev_id==NULL)
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{
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printk("WARNING: dev_id == NULL in request_irq\n");
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dev_id=(void*)1;
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}
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irq_tab[irq].handler = handler;
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irq_tab[irq].flags = flags;
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irq_tab[irq].dev_id = dev_id;
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strlcpy(irq_tab[irq].devname,devname,sizeof(irq_tab[irq].devname));
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irq_tab[irq].state = 0;
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return 0;
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}
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else {
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/* Q40_IRQ_SAMPLE :somewhat special actions required here ..*/
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cpu_request_irq(4, handler, flags, devname, dev_id);
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cpu_request_irq(6, handler, flags, devname, dev_id);
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return 0;
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}
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}
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void q40_free_irq(unsigned int irq, void *dev_id)
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{
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if (irq > Q40_IRQ_MAX || (irq>15 && irq<32)) {
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printk("%s: Incorrect IRQ %d, dev_id %x \n", __FUNCTION__, irq, (unsigned)dev_id);
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return;
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}
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/* test for ISA ints not implemented by HW */
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switch (irq)
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{
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case 1: case 2: case 8: case 9:
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case 12: case 13:
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printk("%s: ISA IRQ %d from %x invalid\n", __FUNCTION__, irq, (unsigned)dev_id);
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return;
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case 11: irq=10;
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default:
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;
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}
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if (irq<Q40_IRQ_SAMPLE)
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{
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if (irq_tab[irq].dev_id != dev_id)
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printk("%s: Removing probably wrong IRQ %d from %s\n",
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__FUNCTION__, irq, irq_tab[irq].devname);
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irq_tab[irq].handler = q40_defhand;
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irq_tab[irq].flags = 0;
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irq_tab[irq].dev_id = NULL;
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/* irq_tab[irq].devname = NULL; */
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/* do not reset state !! */
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}
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else
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{ /* == Q40_IRQ_SAMPLE */
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cpu_free_irq(4, dev_id);
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cpu_free_irq(6, dev_id);
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}
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}
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irqreturn_t q40_process_int (int level, struct pt_regs *fp)
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{
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printk("unexpected interrupt vec=%x, pc=%lx, d0=%lx, d0_orig=%lx, d1=%lx, d2=%lx\n",
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level, fp->pc, fp->d0, fp->orig_d0, fp->d1, fp->d2);
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printk("\tIIRQ_REG = %x, EIRQ_REG = %x\n",master_inb(IIRQ_REG),master_inb(EIRQ_REG));
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return IRQ_HANDLED;
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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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{
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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) 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_routine)(int, void *, struct pt_regs *);
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static irqreturn_t q40_timer_int (int irq, void * dev, struct pt_regs * regs)
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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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{
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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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q40_timer_routine(irq, dev, regs);
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return IRQ_HANDLED;
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}
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void q40_sched_init (irqreturn_t (*timer_routine)(int, void *, struct pt_regs *))
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{
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int timer_irq;
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q40_timer_routine = timer_routine;
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timer_irq=Q40_IRQ_FRAME;
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if (request_irq(timer_irq, q40_timer_int, 0,
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"timer", q40_timer_int))
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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 IRQ's*/
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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 level 2 interrupt, dispatch to ISA or keyboard/timer IRQs */
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irqreturn_t q40_irq2_handler (int vec, void *devname, struct pt_regs *fp)
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{
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unsigned mir, mer;
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int irq,i;
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//repeat:
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mir=master_inb(IIRQ_REG);
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if (mir&Q40_IRQ_FRAME_MASK) {
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irq_tab[Q40_IRQ_FRAME].count++;
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irq_tab[Q40_IRQ_FRAME].handler(Q40_IRQ_FRAME,irq_tab[Q40_IRQ_FRAME].dev_id,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 occassionally 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 (irq_tab[irq].handler == q40_defhand ) {
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printk("handler for IRQ %d not defined\n",irq);
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continue; /* ignore uninited INTs :-( */
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}
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if ( irq_tab[irq].state & 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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/*printk("IRQ_INPROGRESS detected for irq %d, disabling - %s disabled\n",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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irq_tab[irq].count++;
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irq_tab[irq].state |= IRQ_INPROGRESS;
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irq_tab[irq].handler(irq,irq_tab[irq].dev_id,fp);
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irq_tab[irq].state &= ~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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#else
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disabled=0;
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/*printk("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 IRQ_HANDLED;
|
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}
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}
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if (mer && ccleirq>0 && !aliased_irq)
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printk("ISA interrupt from unknown source? EIRQ_REG = %x\n",mer),ccleirq--;
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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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irq_tab[Q40_IRQ_KEYBOARD].count++;
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irq_tab[Q40_IRQ_KEYBOARD].handler(Q40_IRQ_KEYBOARD,irq_tab[Q40_IRQ_KEYBOARD].dev_id,fp);
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}
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return IRQ_HANDLED;
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}
|
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int show_q40_interrupts (struct seq_file *p, void *v)
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{
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int i;
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||||
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for (i = 0; i <= Q40_IRQ_MAX; i++) {
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if (irq_tab[i].count)
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seq_printf(p, "%sIRQ %02d: %8d %s%s\n",
|
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(i<=15) ? "ISA-" : " " ,
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i, irq_tab[i].count,
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irq_tab[i].devname[0] ? irq_tab[i].devname : "?",
|
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irq_tab[i].handler == q40_defhand ?
|
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" (now unassigned)" : "");
|
||||
}
|
||||
return 0;
|
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}
|
||||
|
||||
|
||||
static irqreturn_t q40_defhand (int irq, void *dev_id, struct pt_regs *fp)
|
||||
{
|
||||
if (irq!=Q40_IRQ_KEYBOARD)
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printk ("Unknown q40 interrupt %d\n", irq);
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else master_outb(-1,KEYBOARD_UNLOCK_REG);
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return IRQ_NONE;
|
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}
|
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static irqreturn_t default_handler(int lev, void *dev_id, struct pt_regs *regs)
|
||||
{
|
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printk ("Uninitialised interrupt level %d\n", lev);
|
||||
return IRQ_NONE;
|
||||
}
|
||||
|
||||
irqreturn_t (*q40_default_handler[SYS_IRQS])(int, void *, struct pt_regs *) = {
|
||||
[0] = default_handler,
|
||||
[1] = default_handler,
|
||||
[2] = default_handler,
|
||||
[3] = default_handler,
|
||||
[4] = default_handler,
|
||||
[5] = default_handler,
|
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[6] = default_handler,
|
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[7] = default_handler
|
||||
};
|
||||
|
||||
|
||||
void q40_enable_irq (unsigned int irq)
|
||||
{
|
||||
if ( irq>=5 && irq<=15 )
|
||||
{
|
||||
mext_disabled--;
|
||||
if (mext_disabled>0)
|
||||
printk("q40_enable_irq : nested disable/enable\n");
|
||||
if (mext_disabled==0)
|
||||
master_outb(1,EXT_ENABLE_REG);
|
||||
}
|
||||
}
|
||||
|
||||
|
||||
void q40_disable_irq (unsigned int irq)
|
||||
{
|
||||
/* disable ISA iqs : only do something if the driver has been
|
||||
* verified to be Q40 "compatible" - right now IDE, NE2K
|
||||
* Any driver should not attempt to sleep across disable_irq !!
|
||||
*/
|
||||
|
||||
if ( irq>=5 && irq<=15 ) {
|
||||
master_outb(0,EXT_ENABLE_REG);
|
||||
mext_disabled++;
|
||||
if (mext_disabled>1) printk("disable_irq nesting count %d\n",mext_disabled);
|
||||
}
|
||||
}
|
||||
|
||||
unsigned long q40_probe_irq_on (void)
|
||||
{
|
||||
printk("irq probing not working - reconfigure the driver to avoid this\n");
|
||||
return -1;
|
||||
}
|
||||
int q40_probe_irq_off (unsigned long irqs)
|
||||
{
|
||||
return -1;
|
||||
}
|
||||
/*
|
||||
* Local variables:
|
||||
* compile-command: "m68k-linux-gcc -D__KERNEL__ -I/home/rz/lx/linux-2.2.6/include -Wall -Wstrict-prototypes -O2 -fomit-frame-pointer -pipe -fno-strength-reduce -ffixed-a2 -m68040 -c -o q40ints.o q40ints.c"
|
||||
* End:
|
||||
*/
|
||||
Reference in New Issue
Block a user