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linux-stable-rt/arch/m68knommu/platform/68360/ints.c

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/*
* linux/arch/$(ARCH)/platform/$(PLATFORM)/ints.c
*
* This file is subject to the terms and conditions of the GNU General Public
* License. See the file COPYING in the main directory of this archive
* for more details.
*
* Copyright (c) 2000 Michael Leslie <mleslie@lineo.com>
* Copyright (c) 1996 Roman Zippel
* Copyright (c) 1999 D. Jeff Dionne <jeff@uclinux.org>
*/
#include <linux/module.h>
#include <linux/types.h>
#include <linux/kernel.h>
#include <linux/sched.h>
#include <linux/kernel_stat.h>
#include <linux/errno.h>
#include <asm/system.h>
#include <asm/irq.h>
#include <asm/irqnode.h>
#include <asm/traps.h>
#include <asm/io.h>
#include <asm/machdep.h>
#include <asm/setup.h>
#include <asm/m68360.h>
/* from quicc/commproc.c: */
extern QUICC *pquicc;
extern void cpm_interrupt_init(void);
#define INTERNAL_IRQS (96)
/* assembler routines */
asmlinkage void system_call(void);
asmlinkage void buserr(void);
asmlinkage void trap(void);
asmlinkage irqreturn_t bad_interrupt(void);
asmlinkage irqreturn_t inthandler(void);
extern void *_ramvec[];
/* The number of spurious interrupts */
volatile unsigned int num_spurious;
unsigned int local_irq_count[NR_CPUS];
/* irq node variables for the 32 (potential) on chip sources */
static irq_node_t int_irq_list[INTERNAL_IRQS];
static short int_irq_ablecount[INTERNAL_IRQS];
/*
* This function should be called during kernel startup to initialize
* IRQ handling routines.
*/
void init_IRQ(void)
{
int i;
int vba = (CPM_VECTOR_BASE<<4);
/* set up the vectors */
_ramvec[2] = buserr;
_ramvec[3] = trap;
_ramvec[4] = trap;
_ramvec[5] = trap;
_ramvec[6] = trap;
_ramvec[7] = trap;
_ramvec[8] = trap;
_ramvec[9] = trap;
_ramvec[10] = trap;
_ramvec[11] = trap;
_ramvec[12] = trap;
_ramvec[13] = trap;
_ramvec[14] = trap;
_ramvec[15] = trap;
_ramvec[32] = system_call;
_ramvec[33] = trap;
cpm_interrupt_init();
/* set up CICR for vector base address and irq level */
/* irl = 4, hp = 1f - see MC68360UM p 7-377 */
pquicc->intr_cicr = 0x00e49f00 | vba;
/* CPM interrupt vectors: (p 7-376) */
_ramvec[vba+CPMVEC_ERROR] = bad_interrupt; /* Error */
_ramvec[vba+CPMVEC_PIO_PC11] = inthandler; /* pio - pc11 */
_ramvec[vba+CPMVEC_PIO_PC10] = inthandler; /* pio - pc10 */
_ramvec[vba+CPMVEC_SMC2] = inthandler; /* smc2/pip */
_ramvec[vba+CPMVEC_SMC1] = inthandler; /* smc1 */
_ramvec[vba+CPMVEC_SPI] = inthandler; /* spi */
_ramvec[vba+CPMVEC_PIO_PC9] = inthandler; /* pio - pc9 */
_ramvec[vba+CPMVEC_TIMER4] = inthandler; /* timer 4 */
_ramvec[vba+CPMVEC_RESERVED1] = inthandler; /* reserved */
_ramvec[vba+CPMVEC_PIO_PC8] = inthandler; /* pio - pc8 */
_ramvec[vba+CPMVEC_PIO_PC7] = inthandler; /* pio - pc7 */
_ramvec[vba+CPMVEC_PIO_PC6] = inthandler; /* pio - pc6 */
_ramvec[vba+CPMVEC_TIMER3] = inthandler; /* timer 3 */
_ramvec[vba+CPMVEC_RISCTIMER] = inthandler; /* reserved */
_ramvec[vba+CPMVEC_PIO_PC5] = inthandler; /* pio - pc5 */
_ramvec[vba+CPMVEC_PIO_PC4] = inthandler; /* pio - pc4 */
_ramvec[vba+CPMVEC_RESERVED2] = inthandler; /* reserved */
_ramvec[vba+CPMVEC_RISCTIMER] = inthandler; /* timer table */
_ramvec[vba+CPMVEC_TIMER2] = inthandler; /* timer 2 */
_ramvec[vba+CPMVEC_RESERVED3] = inthandler; /* reserved */
_ramvec[vba+CPMVEC_IDMA2] = inthandler; /* idma 2 */
_ramvec[vba+CPMVEC_IDMA1] = inthandler; /* idma 1 */
_ramvec[vba+CPMVEC_SDMA_CB_ERR] = inthandler; /* sdma channel bus error */
_ramvec[vba+CPMVEC_PIO_PC3] = inthandler; /* pio - pc3 */
_ramvec[vba+CPMVEC_PIO_PC2] = inthandler; /* pio - pc2 */
/* _ramvec[vba+CPMVEC_TIMER1] = cpm_isr_timer1; */ /* timer 1 */
_ramvec[vba+CPMVEC_TIMER1] = inthandler; /* timer 1 */
_ramvec[vba+CPMVEC_PIO_PC1] = inthandler; /* pio - pc1 */
_ramvec[vba+CPMVEC_SCC4] = inthandler; /* scc 4 */
_ramvec[vba+CPMVEC_SCC3] = inthandler; /* scc 3 */
_ramvec[vba+CPMVEC_SCC2] = inthandler; /* scc 2 */
_ramvec[vba+CPMVEC_SCC1] = inthandler; /* scc 1 */
_ramvec[vba+CPMVEC_PIO_PC0] = inthandler; /* pio - pc0 */
/* turn off all CPM interrupts */
pquicc->intr_cimr = 0x00000000;
/* initialize handlers */
for (i = 0; i < INTERNAL_IRQS; i++) {
int_irq_list[i].handler = NULL;
int_irq_list[i].flags = IRQ_FLG_STD;
int_irq_list[i].dev_id = NULL;
int_irq_list[i].devname = NULL;
}
}
#if 0
void M68360_insert_irq(irq_node_t **list, irq_node_t *node)
{
unsigned long flags;
irq_node_t *cur;
if (!node->dev_id)
printk(KERN_INFO "%s: Warning: dev_id of %s is zero\n",
__FUNCTION__, node->devname);
local_irq_save(flags);
cur = *list;
while (cur) {
list = &cur->next;
cur = cur->next;
}
node->next = cur;
*list = node;
local_irq_restore(flags);
}
void M68360_delete_irq(irq_node_t **list, void *dev_id)
{
unsigned long flags;
irq_node_t *node;
local_irq_save(flags);
for (node = *list; node; list = &node->next, node = *list) {
if (node->dev_id == dev_id) {
*list = node->next;
/* Mark it as free. */
node->handler = NULL;
local_irq_restore(flags);
return;
}
}
local_irq_restore(flags);
printk (KERN_INFO "%s: tried to remove invalid irq\n", __FUNCTION__);
}
#endif
int request_irq(
unsigned int irq,
irqreturn_t (*handler)(int, void *, struct pt_regs *),
unsigned long flags,
const char *devname,
void *dev_id)
{
int mask = (1<<irq);
irq += (CPM_VECTOR_BASE<<4);
if (irq >= INTERNAL_IRQS) {
printk (KERN_ERR "%s: Unknown IRQ %d from %s\n", __FUNCTION__, irq, devname);
return -ENXIO;
}
if (!(int_irq_list[irq].flags & IRQ_FLG_STD)) {
if (int_irq_list[irq].flags & IRQ_FLG_LOCK) {
printk(KERN_ERR "%s: IRQ %d from %s is not replaceable\n",
__FUNCTION__, irq, int_irq_list[irq].devname);
return -EBUSY;
}
if (flags & IRQ_FLG_REPLACE) {
printk(KERN_ERR "%s: %s can't replace IRQ %d from %s\n",
__FUNCTION__, devname, irq, int_irq_list[irq].devname);
return -EBUSY;
}
}
int_irq_list[irq].handler = handler;
int_irq_list[irq].flags = flags;
int_irq_list[irq].dev_id = dev_id;
int_irq_list[irq].devname = devname;
/* enable in the CIMR */
if (!int_irq_ablecount[irq])
pquicc->intr_cimr |= mask;
/* *(volatile unsigned long *)0xfffff304 &= ~(1<<irq); */
return 0;
}
EXPORT_SYMBOL(request_irq);
void free_irq(unsigned int irq, void *dev_id)
{
if (irq >= INTERNAL_IRQS) {
printk (KERN_ERR "%s: Unknown IRQ %d\n", __FUNCTION__, irq);
return;
}
if (int_irq_list[irq].dev_id != dev_id)
printk(KERN_INFO "%s: removing probably wrong IRQ %d from %s\n",
__FUNCTION__, irq, int_irq_list[irq].devname);
int_irq_list[irq].handler = NULL;
int_irq_list[irq].flags = IRQ_FLG_STD;
int_irq_list[irq].dev_id = NULL;
int_irq_list[irq].devname = NULL;
*(volatile unsigned long *)0xfffff304 |= 1<<irq;
}
EXPORT_SYMBOL(free_irq);
#if 0
/*
* Enable/disable a particular machine specific interrupt source.
* Note that this may affect other interrupts in case of a shared interrupt.
* This function should only be called for a _very_ short time to change some
* internal data, that may not be changed by the interrupt at the same time.
* int_(enable|disable)_irq calls may also be nested.
*/
void M68360_enable_irq(unsigned int irq)
{
if (irq >= INTERNAL_IRQS) {
printk(KERN_ERR "%s: Unknown IRQ %d\n", __FUNCTION__, irq);
return;
}
if (--int_irq_ablecount[irq])
return;
/* enable the interrupt */
*(volatile unsigned long *)0xfffff304 &= ~(1<<irq);
}
void M68360_disable_irq(unsigned int irq)
{
if (irq >= INTERNAL_IRQS) {
printk(KERN_ERR "%s: Unknown IRQ %d\n", __FUNCTION__, irq);
return;
}
if (int_irq_ablecount[irq]++)
return;
/* disable the interrupt */
*(volatile unsigned long *)0xfffff304 |= 1<<irq;
}
#endif
int show_interrupts(struct seq_file *p, void *v)
{
int i = *(loff_t *) v;
if (i < NR_IRQS) {
if (int_irq_list[i].devname) {
seq_printf(p, "%3d: %10u ", i, kstat_cpu(0).irqs[i]);
if (int_irq_list[i].flags & IRQ_FLG_LOCK)
seq_printf(p, "L ");
else
seq_printf(p, " ");
seq_printf(p, "%s\n", int_irq_list[i].devname);
}
}
if (i == NR_IRQS)
seq_printf(p, " : %10u spurious\n", num_spurious);
return 0;
}
/* The 68k family did not have a good way to determine the source
* of interrupts until later in the family. The EC000 core does
* not provide the vector number on the stack, we vector everything
* into one vector and look in the blasted mask register...
* This code is designed to be fast, almost constant time, not clean!
*/
void process_int(int vec, struct pt_regs *fp)
{
int irq;
int mask;
/* unsigned long pend = *(volatile unsigned long *)0xfffff30c; */
/* irq = vec + (CPM_VECTOR_BASE<<4); */
irq = vec;
/* unsigned long pend = *(volatile unsigned long *)pquicc->intr_cipr; */
/* Bugger all that weirdness. For the moment, I seem to know where I came from;
* vec is passed from a specific ISR, so I'll use it. */
if (int_irq_list[irq].handler) {
int_irq_list[irq].handler(irq , int_irq_list[irq].dev_id, fp);
kstat_cpu(0).irqs[irq]++;
pquicc->intr_cisr = (1 << vec); /* indicate that irq has been serviced */
} else {
printk(KERN_ERR "unregistered interrupt %d!\nTurning it off in the CIMR...\n", irq);
/* *(volatile unsigned long *)0xfffff304 |= mask; */
pquicc->intr_cimr &= ~(1 << vec);
num_spurious += 1;
}
return(IRQ_HANDLED);
}
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