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750321ace9
Compiling for a classic m68k non-MMU target with no specific CPU
selected fails with the following error:
arch/m68k/68000/ints.c: In function 'process_int':
>> arch/m68k/68000/ints.c:82:30: error: 'ISR' undeclared (first use in this function)
82 | unsigned long pend = ISR;
| ^~~
This interrupt handling code is specific to the 68328 family of 68000
parts. There is a couple of variants (68EZ328, 68VZ328) and the common
ancestor of them the strait 68328.
The code here includes a specific header for each variant type. But if
none is selected then nothing is included to supply the appropriate
register and bit flags defines.
Rearrange the includes so that at least one type is always included.
At the very least the 68328 base type should be the fallback, so make
that true.
Reported-by: kernel test robot <lkp@intel.com>
Reviewed-by: Geert Uytterhoeven <geert@linux-m68k.org>
Signed-off-by: Greg Ungerer <gerg@linux-m68k.org>
187 lines
4.2 KiB
C
187 lines
4.2 KiB
C
/*
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* ints.c - Generic interrupt controller support
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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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* Copyright 1996 Roman Zippel
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* Copyright 1999 D. Jeff Dionne <jeff@rt-control.com>
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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/init.h>
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#include <linux/interrupt.h>
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#include <linux/irq.h>
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#include <asm/traps.h>
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#include <asm/io.h>
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#include <asm/machdep.h>
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#if defined(CONFIG_M68EZ328)
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#include <asm/MC68EZ328.h>
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#elif defined(CONFIG_M68VZ328)
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#include <asm/MC68VZ328.h>
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#else
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#include <asm/MC68328.h>
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#endif
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/* assembler routines */
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asmlinkage void system_call(void);
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asmlinkage void buserr(void);
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asmlinkage void trap(void);
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asmlinkage void trap3(void);
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asmlinkage void trap4(void);
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asmlinkage void trap5(void);
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asmlinkage void trap6(void);
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asmlinkage void trap7(void);
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asmlinkage void trap8(void);
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asmlinkage void trap9(void);
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asmlinkage void trap10(void);
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asmlinkage void trap11(void);
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asmlinkage void trap12(void);
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asmlinkage void trap13(void);
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asmlinkage void trap14(void);
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asmlinkage void trap15(void);
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asmlinkage void trap33(void);
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asmlinkage void trap34(void);
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asmlinkage void trap35(void);
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asmlinkage void trap36(void);
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asmlinkage void trap37(void);
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asmlinkage void trap38(void);
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asmlinkage void trap39(void);
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asmlinkage void trap40(void);
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asmlinkage void trap41(void);
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asmlinkage void trap42(void);
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asmlinkage void trap43(void);
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asmlinkage void trap44(void);
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asmlinkage void trap45(void);
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asmlinkage void trap46(void);
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asmlinkage void trap47(void);
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asmlinkage irqreturn_t bad_interrupt(int, void *);
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asmlinkage irqreturn_t inthandler(void);
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asmlinkage irqreturn_t inthandler1(void);
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asmlinkage irqreturn_t inthandler2(void);
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asmlinkage irqreturn_t inthandler3(void);
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asmlinkage irqreturn_t inthandler4(void);
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asmlinkage irqreturn_t inthandler5(void);
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asmlinkage irqreturn_t inthandler6(void);
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asmlinkage irqreturn_t inthandler7(void);
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/* The 68k family did not have a good way to determine the source
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* of interrupts until later in the family. The EC000 core does
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* not provide the vector number on the stack, we vector everything
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* into one vector and look in the blasted mask register...
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* This code is designed to be fast, almost constant time, not clean!
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*/
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void process_int(int vec, struct pt_regs *fp)
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{
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int irq;
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int mask;
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unsigned long pend = ISR;
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while (pend) {
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if (pend & 0x0000ffff) {
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if (pend & 0x000000ff) {
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if (pend & 0x0000000f) {
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mask = 0x00000001;
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irq = 0;
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} else {
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mask = 0x00000010;
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irq = 4;
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}
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} else {
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if (pend & 0x00000f00) {
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mask = 0x00000100;
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irq = 8;
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} else {
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mask = 0x00001000;
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irq = 12;
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}
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}
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} else {
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if (pend & 0x00ff0000) {
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if (pend & 0x000f0000) {
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mask = 0x00010000;
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irq = 16;
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} else {
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mask = 0x00100000;
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irq = 20;
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}
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} else {
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if (pend & 0x0f000000) {
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mask = 0x01000000;
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irq = 24;
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} else {
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mask = 0x10000000;
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irq = 28;
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}
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}
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}
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while (! (mask & pend)) {
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mask <<=1;
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irq++;
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}
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do_IRQ(irq, fp);
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pend &= ~mask;
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}
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}
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static void intc_irq_unmask(struct irq_data *d)
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{
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IMR &= ~(1 << d->irq);
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}
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static void intc_irq_mask(struct irq_data *d)
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{
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IMR |= (1 << d->irq);
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}
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static struct irq_chip intc_irq_chip = {
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.name = "M68K-INTC",
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.irq_mask = intc_irq_mask,
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.irq_unmask = intc_irq_unmask,
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};
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/*
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* This function should be called during kernel startup to initialize
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* the machine vector table.
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*/
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void __init trap_init(void)
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{
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int i;
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/* set up the vectors */
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for (i = 72; i < 256; ++i)
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_ramvec[i] = (e_vector) bad_interrupt;
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_ramvec[32] = system_call;
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_ramvec[65] = (e_vector) inthandler1;
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_ramvec[66] = (e_vector) inthandler2;
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_ramvec[67] = (e_vector) inthandler3;
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_ramvec[68] = (e_vector) inthandler4;
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_ramvec[69] = (e_vector) inthandler5;
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_ramvec[70] = (e_vector) inthandler6;
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_ramvec[71] = (e_vector) inthandler7;
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}
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void __init init_IRQ(void)
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{
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int i;
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IVR = 0x40; /* Set DragonBall IVR (interrupt base) to 64 */
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/* turn off all interrupts */
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IMR = ~0;
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for (i = 0; (i < NR_IRQS); i++) {
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irq_set_chip(i, &intc_irq_chip);
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irq_set_handler(i, handle_level_irq);
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}
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}
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