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
648
arch/m68k/atari/ataints.c
Normal file
648
arch/m68k/atari/ataints.c
Normal file
@@ -0,0 +1,648 @@
|
||||
/*
|
||||
* arch/m68k/atari/ataints.c -- Atari Linux interrupt handling code
|
||||
*
|
||||
* 5/2/94 Roman Hodek:
|
||||
* Added support for TT interrupts; setup for TT SCU (may someone has
|
||||
* twiddled there and we won't get the right interrupts :-()
|
||||
*
|
||||
* Major change: The device-independent code in m68k/ints.c didn't know
|
||||
* about non-autovec ints yet. It hardcoded the number of possible ints to
|
||||
* 7 (IRQ1...IRQ7). But the Atari has lots of non-autovec ints! I made the
|
||||
* number of possible ints a constant defined in interrupt.h, which is
|
||||
* 47 for the Atari. So we can call request_irq() for all Atari interrupts
|
||||
* just the normal way. Additionally, all vectors >= 48 are initialized to
|
||||
* call trap() instead of inthandler(). This must be changed here, too.
|
||||
*
|
||||
* 1995-07-16 Lars Brinkhoff <f93labr@dd.chalmers.se>:
|
||||
* Corrected a bug in atari_add_isr() which rejected all SCC
|
||||
* interrupt sources if there were no TT MFP!
|
||||
*
|
||||
* 12/13/95: New interface functions atari_level_triggered_int() and
|
||||
* atari_register_vme_int() as support for level triggered VME interrupts.
|
||||
*
|
||||
* 02/12/96: (Roman)
|
||||
* Total rewrite of Atari interrupt handling, for new scheme see comments
|
||||
* below.
|
||||
*
|
||||
* 1996-09-03 lars brinkhoff <f93labr@dd.chalmers.se>:
|
||||
* Added new function atari_unregister_vme_int(), and
|
||||
* modified atari_register_vme_int() as well as IS_VALID_INTNO()
|
||||
* to work with it.
|
||||
*
|
||||
* 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.
|
||||
*
|
||||
*/
|
||||
|
||||
#include <linux/types.h>
|
||||
#include <linux/kernel.h>
|
||||
#include <linux/kernel_stat.h>
|
||||
#include <linux/init.h>
|
||||
#include <linux/seq_file.h>
|
||||
|
||||
#include <asm/system.h>
|
||||
#include <asm/traps.h>
|
||||
|
||||
#include <asm/atarihw.h>
|
||||
#include <asm/atariints.h>
|
||||
#include <asm/atari_stdma.h>
|
||||
#include <asm/irq.h>
|
||||
#include <asm/entry.h>
|
||||
|
||||
|
||||
/*
|
||||
* Atari interrupt handling scheme:
|
||||
* --------------------------------
|
||||
*
|
||||
* All interrupt source have an internal number (defined in
|
||||
* <asm/atariints.h>): Autovector interrupts are 1..7, then follow ST-MFP,
|
||||
* TT-MFP, SCC, and finally VME interrupts. Vector numbers for the latter can
|
||||
* be allocated by atari_register_vme_int().
|
||||
*
|
||||
* Each interrupt can be of three types:
|
||||
*
|
||||
* - SLOW: The handler runs with all interrupts enabled, except the one it
|
||||
* was called by (to avoid reentering). This should be the usual method.
|
||||
* But it is currently possible only for MFP ints, since only the MFP
|
||||
* offers an easy way to mask interrupts.
|
||||
*
|
||||
* - FAST: The handler runs with all interrupts disabled. This should be used
|
||||
* only for really fast handlers, that just do actions immediately
|
||||
* necessary, and let the rest do a bottom half or task queue.
|
||||
*
|
||||
* - PRIORITIZED: The handler can be interrupted by higher-level ints
|
||||
* (greater IPL, no MFP priorities!). This is the method of choice for ints
|
||||
* which should be slow, but are not from a MFP.
|
||||
*
|
||||
* The feature of more than one handler for one int source is still there, but
|
||||
* only applicable if all handers are of the same type. To not slow down
|
||||
* processing of ints with only one handler by the chaining feature, the list
|
||||
* calling function atari_call_irq_list() is only plugged in at the time the
|
||||
* second handler is registered.
|
||||
*
|
||||
* Implementation notes: For fast-as-possible int handling, there are separate
|
||||
* entry points for each type (slow/fast/prio). The assembler handler calls
|
||||
* the irq directly in the usual case, no C wrapper is involved. In case of
|
||||
* multiple handlers, atari_call_irq_list() is registered as handler and calls
|
||||
* in turn the real irq's. To ease access from assembler level to the irq
|
||||
* function pointer and accompanying data, these two are stored in a separate
|
||||
* array, irq_handler[]. The rest of data (type, name) are put into a second
|
||||
* array, irq_param, that is accessed from C only. For each slow interrupt (32
|
||||
* in all) there are separate handler functions, which makes it possible to
|
||||
* hard-code the MFP register address and value, are necessary to mask the
|
||||
* int. If there'd be only one generic function, lots of calculations would be
|
||||
* needed to determine MFP register and int mask from the vector number :-(
|
||||
*
|
||||
* Furthermore, slow ints may not lower the IPL below its previous value
|
||||
* (before the int happened). This is needed so that an int of class PRIO, on
|
||||
* that this int may be stacked, cannot be reentered. This feature is
|
||||
* implemented as follows: If the stack frame format is 1 (throwaway), the int
|
||||
* is not stacked, and the IPL is anded with 0xfbff, resulting in a new level
|
||||
* 2, which still blocks the HSYNC, but no interrupts of interest. If the
|
||||
* frame format is 0, the int is nested, and the old IPL value can be found in
|
||||
* the sr copy in the frame.
|
||||
*/
|
||||
|
||||
|
||||
#define NUM_INT_SOURCES (8 + NUM_ATARI_SOURCES)
|
||||
|
||||
typedef void (*asm_irq_handler)(void);
|
||||
|
||||
struct irqhandler {
|
||||
irqreturn_t (*handler)(int, void *, struct pt_regs *);
|
||||
void *dev_id;
|
||||
};
|
||||
|
||||
struct irqparam {
|
||||
unsigned long flags;
|
||||
const char *devname;
|
||||
};
|
||||
|
||||
/*
|
||||
* Array with irq's and their parameter data. This array is accessed from low
|
||||
* level assembler code, so an element size of 8 allows usage of index scaling
|
||||
* addressing mode.
|
||||
*/
|
||||
static struct irqhandler irq_handler[NUM_INT_SOURCES];
|
||||
|
||||
/*
|
||||
* This array hold the rest of parameters of int handlers: type
|
||||
* (slow,fast,prio) and the name of the handler. These values are only
|
||||
* accessed from C
|
||||
*/
|
||||
static struct irqparam irq_param[NUM_INT_SOURCES];
|
||||
|
||||
/*
|
||||
* Bitmap for free interrupt vector numbers
|
||||
* (new vectors starting from 0x70 can be allocated by
|
||||
* atari_register_vme_int())
|
||||
*/
|
||||
static int free_vme_vec_bitmap;
|
||||
|
||||
/* check for valid int number (complex, sigh...) */
|
||||
#define IS_VALID_INTNO(n) \
|
||||
((n) > 0 && \
|
||||
/* autovec and ST-MFP ok anyway */ \
|
||||
(((n) < TTMFP_SOURCE_BASE) || \
|
||||
/* TT-MFP ok if present */ \
|
||||
((n) >= TTMFP_SOURCE_BASE && (n) < SCC_SOURCE_BASE && \
|
||||
ATARIHW_PRESENT(TT_MFP)) || \
|
||||
/* SCC ok if present and number even */ \
|
||||
((n) >= SCC_SOURCE_BASE && (n) < VME_SOURCE_BASE && \
|
||||
!((n) & 1) && ATARIHW_PRESENT(SCC)) || \
|
||||
/* greater numbers ok if they are registered VME vectors */ \
|
||||
((n) >= VME_SOURCE_BASE && (n) < VME_SOURCE_BASE + VME_MAX_SOURCES && \
|
||||
free_vme_vec_bitmap & (1 << ((n) - VME_SOURCE_BASE)))))
|
||||
|
||||
|
||||
/*
|
||||
* Here start the assembler entry points for interrupts
|
||||
*/
|
||||
|
||||
#define IRQ_NAME(nr) atari_slow_irq_##nr##_handler(void)
|
||||
|
||||
#define BUILD_SLOW_IRQ(n) \
|
||||
asmlinkage void IRQ_NAME(n); \
|
||||
/* Dummy function to allow asm with operands. */ \
|
||||
void atari_slow_irq_##n##_dummy (void) { \
|
||||
__asm__ (__ALIGN_STR "\n" \
|
||||
"atari_slow_irq_" #n "_handler:\t" \
|
||||
" addl %6,%5\n" /* preempt_count() += HARDIRQ_OFFSET */ \
|
||||
SAVE_ALL_INT "\n" \
|
||||
GET_CURRENT(%%d0) "\n" \
|
||||
" andb #~(1<<(%c3&7)),%a4:w\n" /* mask this interrupt */ \
|
||||
/* get old IPL from stack frame */ \
|
||||
" bfextu %%sp@(%c2){#5,#3},%%d0\n" \
|
||||
" movew %%sr,%%d1\n" \
|
||||
" bfins %%d0,%%d1{#21,#3}\n" \
|
||||
" movew %%d1,%%sr\n" /* set IPL = previous value */ \
|
||||
" addql #1,%a0\n" \
|
||||
" lea %a1,%%a0\n" \
|
||||
" pea %%sp@\n" /* push addr of frame */ \
|
||||
" movel %%a0@(4),%%sp@-\n" /* push handler data */ \
|
||||
" pea (%c3+8)\n" /* push int number */ \
|
||||
" movel %%a0@,%%a0\n" \
|
||||
" jbsr %%a0@\n" /* call the handler */ \
|
||||
" addql #8,%%sp\n" \
|
||||
" addql #4,%%sp\n" \
|
||||
" orw #0x0600,%%sr\n" \
|
||||
" andw #0xfeff,%%sr\n" /* set IPL = 6 again */ \
|
||||
" orb #(1<<(%c3&7)),%a4:w\n" /* now unmask the int again */ \
|
||||
" jbra ret_from_interrupt\n" \
|
||||
: : "i" (&kstat_cpu(0).irqs[n+8]), "i" (&irq_handler[n+8]), \
|
||||
"n" (PT_OFF_SR), "n" (n), \
|
||||
"i" (n & 8 ? (n & 16 ? &tt_mfp.int_mk_a : &mfp.int_mk_a) \
|
||||
: (n & 16 ? &tt_mfp.int_mk_b : &mfp.int_mk_b)), \
|
||||
"m" (preempt_count()), "di" (HARDIRQ_OFFSET) \
|
||||
); \
|
||||
for (;;); /* fake noreturn */ \
|
||||
}
|
||||
|
||||
BUILD_SLOW_IRQ(0);
|
||||
BUILD_SLOW_IRQ(1);
|
||||
BUILD_SLOW_IRQ(2);
|
||||
BUILD_SLOW_IRQ(3);
|
||||
BUILD_SLOW_IRQ(4);
|
||||
BUILD_SLOW_IRQ(5);
|
||||
BUILD_SLOW_IRQ(6);
|
||||
BUILD_SLOW_IRQ(7);
|
||||
BUILD_SLOW_IRQ(8);
|
||||
BUILD_SLOW_IRQ(9);
|
||||
BUILD_SLOW_IRQ(10);
|
||||
BUILD_SLOW_IRQ(11);
|
||||
BUILD_SLOW_IRQ(12);
|
||||
BUILD_SLOW_IRQ(13);
|
||||
BUILD_SLOW_IRQ(14);
|
||||
BUILD_SLOW_IRQ(15);
|
||||
BUILD_SLOW_IRQ(16);
|
||||
BUILD_SLOW_IRQ(17);
|
||||
BUILD_SLOW_IRQ(18);
|
||||
BUILD_SLOW_IRQ(19);
|
||||
BUILD_SLOW_IRQ(20);
|
||||
BUILD_SLOW_IRQ(21);
|
||||
BUILD_SLOW_IRQ(22);
|
||||
BUILD_SLOW_IRQ(23);
|
||||
BUILD_SLOW_IRQ(24);
|
||||
BUILD_SLOW_IRQ(25);
|
||||
BUILD_SLOW_IRQ(26);
|
||||
BUILD_SLOW_IRQ(27);
|
||||
BUILD_SLOW_IRQ(28);
|
||||
BUILD_SLOW_IRQ(29);
|
||||
BUILD_SLOW_IRQ(30);
|
||||
BUILD_SLOW_IRQ(31);
|
||||
|
||||
asm_irq_handler slow_handlers[32] = {
|
||||
[0] = atari_slow_irq_0_handler,
|
||||
[1] = atari_slow_irq_1_handler,
|
||||
[2] = atari_slow_irq_2_handler,
|
||||
[3] = atari_slow_irq_3_handler,
|
||||
[4] = atari_slow_irq_4_handler,
|
||||
[5] = atari_slow_irq_5_handler,
|
||||
[6] = atari_slow_irq_6_handler,
|
||||
[7] = atari_slow_irq_7_handler,
|
||||
[8] = atari_slow_irq_8_handler,
|
||||
[9] = atari_slow_irq_9_handler,
|
||||
[10] = atari_slow_irq_10_handler,
|
||||
[11] = atari_slow_irq_11_handler,
|
||||
[12] = atari_slow_irq_12_handler,
|
||||
[13] = atari_slow_irq_13_handler,
|
||||
[14] = atari_slow_irq_14_handler,
|
||||
[15] = atari_slow_irq_15_handler,
|
||||
[16] = atari_slow_irq_16_handler,
|
||||
[17] = atari_slow_irq_17_handler,
|
||||
[18] = atari_slow_irq_18_handler,
|
||||
[19] = atari_slow_irq_19_handler,
|
||||
[20] = atari_slow_irq_20_handler,
|
||||
[21] = atari_slow_irq_21_handler,
|
||||
[22] = atari_slow_irq_22_handler,
|
||||
[23] = atari_slow_irq_23_handler,
|
||||
[24] = atari_slow_irq_24_handler,
|
||||
[25] = atari_slow_irq_25_handler,
|
||||
[26] = atari_slow_irq_26_handler,
|
||||
[27] = atari_slow_irq_27_handler,
|
||||
[28] = atari_slow_irq_28_handler,
|
||||
[29] = atari_slow_irq_29_handler,
|
||||
[30] = atari_slow_irq_30_handler,
|
||||
[31] = atari_slow_irq_31_handler
|
||||
};
|
||||
|
||||
asmlinkage void atari_fast_irq_handler( void );
|
||||
asmlinkage void atari_prio_irq_handler( void );
|
||||
|
||||
/* Dummy function to allow asm with operands. */
|
||||
void atari_fast_prio_irq_dummy (void) {
|
||||
__asm__ (__ALIGN_STR "\n"
|
||||
"atari_fast_irq_handler:\n\t"
|
||||
"orw #0x700,%%sr\n" /* disable all interrupts */
|
||||
"atari_prio_irq_handler:\n\t"
|
||||
"addl %3,%2\n\t" /* preempt_count() += HARDIRQ_OFFSET */
|
||||
SAVE_ALL_INT "\n\t"
|
||||
GET_CURRENT(%%d0) "\n\t"
|
||||
/* get vector number from stack frame and convert to source */
|
||||
"bfextu %%sp@(%c1){#4,#10},%%d0\n\t"
|
||||
"subw #(0x40-8),%%d0\n\t"
|
||||
"jpl 1f\n\t"
|
||||
"addw #(0x40-8-0x18),%%d0\n"
|
||||
"1:\tlea %a0,%%a0\n\t"
|
||||
"addql #1,%%a0@(%%d0:l:4)\n\t"
|
||||
"lea irq_handler,%%a0\n\t"
|
||||
"lea %%a0@(%%d0:l:8),%%a0\n\t"
|
||||
"pea %%sp@\n\t" /* push frame address */
|
||||
"movel %%a0@(4),%%sp@-\n\t" /* push handler data */
|
||||
"movel %%d0,%%sp@-\n\t" /* push int number */
|
||||
"movel %%a0@,%%a0\n\t"
|
||||
"jsr %%a0@\n\t" /* and call the handler */
|
||||
"addql #8,%%sp\n\t"
|
||||
"addql #4,%%sp\n\t"
|
||||
"jbra ret_from_interrupt"
|
||||
: : "i" (&kstat_cpu(0).irqs), "n" (PT_OFF_FORMATVEC),
|
||||
"m" (preempt_count()), "di" (HARDIRQ_OFFSET)
|
||||
);
|
||||
for (;;);
|
||||
}
|
||||
|
||||
/* GK:
|
||||
* HBL IRQ handler for Falcon. Nobody needs it :-)
|
||||
* ++andreas: raise ipl to disable further HBLANK interrupts.
|
||||
*/
|
||||
asmlinkage void falcon_hblhandler(void);
|
||||
asm(".text\n"
|
||||
__ALIGN_STR "\n\t"
|
||||
"falcon_hblhandler:\n\t"
|
||||
"orw #0x200,%sp@\n\t" /* set saved ipl to 2 */
|
||||
"rte");
|
||||
|
||||
/* Defined in entry.S; only increments 'num_spurious' */
|
||||
asmlinkage void bad_interrupt(void);
|
||||
|
||||
extern void atari_microwire_cmd( int cmd );
|
||||
|
||||
extern int atari_SCC_reset_done;
|
||||
|
||||
/*
|
||||
* void atari_init_IRQ (void)
|
||||
*
|
||||
* Parameters: None
|
||||
*
|
||||
* Returns: Nothing
|
||||
*
|
||||
* This function should be called during kernel startup to initialize
|
||||
* the atari IRQ handling routines.
|
||||
*/
|
||||
|
||||
void __init atari_init_IRQ(void)
|
||||
{
|
||||
int i;
|
||||
|
||||
/* initialize the vector table */
|
||||
for (i = 0; i < NUM_INT_SOURCES; ++i) {
|
||||
vectors[IRQ_SOURCE_TO_VECTOR(i)] = bad_interrupt;
|
||||
}
|
||||
|
||||
/* Initialize the MFP(s) */
|
||||
|
||||
#ifdef ATARI_USE_SOFTWARE_EOI
|
||||
mfp.vec_adr = 0x48; /* Software EOI-Mode */
|
||||
#else
|
||||
mfp.vec_adr = 0x40; /* Automatic EOI-Mode */
|
||||
#endif
|
||||
mfp.int_en_a = 0x00; /* turn off MFP-Ints */
|
||||
mfp.int_en_b = 0x00;
|
||||
mfp.int_mk_a = 0xff; /* no Masking */
|
||||
mfp.int_mk_b = 0xff;
|
||||
|
||||
if (ATARIHW_PRESENT(TT_MFP)) {
|
||||
#ifdef ATARI_USE_SOFTWARE_EOI
|
||||
tt_mfp.vec_adr = 0x58; /* Software EOI-Mode */
|
||||
#else
|
||||
tt_mfp.vec_adr = 0x50; /* Automatic EOI-Mode */
|
||||
#endif
|
||||
tt_mfp.int_en_a = 0x00; /* turn off MFP-Ints */
|
||||
tt_mfp.int_en_b = 0x00;
|
||||
tt_mfp.int_mk_a = 0xff; /* no Masking */
|
||||
tt_mfp.int_mk_b = 0xff;
|
||||
}
|
||||
|
||||
if (ATARIHW_PRESENT(SCC) && !atari_SCC_reset_done) {
|
||||
scc.cha_a_ctrl = 9;
|
||||
MFPDELAY();
|
||||
scc.cha_a_ctrl = (char) 0xc0; /* hardware reset */
|
||||
}
|
||||
|
||||
if (ATARIHW_PRESENT(SCU)) {
|
||||
/* init the SCU if present */
|
||||
tt_scu.sys_mask = 0x10; /* enable VBL (for the cursor) and
|
||||
* disable HSYNC interrupts (who
|
||||
* needs them?) MFP and SCC are
|
||||
* enabled in VME mask
|
||||
*/
|
||||
tt_scu.vme_mask = 0x60; /* enable MFP and SCC ints */
|
||||
}
|
||||
else {
|
||||
/* If no SCU and no Hades, the HSYNC interrupt needs to be
|
||||
* disabled this way. (Else _inthandler in kernel/sys_call.S
|
||||
* gets overruns)
|
||||
*/
|
||||
|
||||
if (!MACH_IS_HADES)
|
||||
vectors[VEC_INT2] = falcon_hblhandler;
|
||||
}
|
||||
|
||||
if (ATARIHW_PRESENT(PCM_8BIT) && ATARIHW_PRESENT(MICROWIRE)) {
|
||||
/* Initialize the LM1992 Sound Controller to enable
|
||||
the PSG sound. This is misplaced here, it should
|
||||
be in an atasound_init(), that doesn't exist yet. */
|
||||
atari_microwire_cmd(MW_LM1992_PSG_HIGH);
|
||||
}
|
||||
|
||||
stdma_init();
|
||||
|
||||
/* Initialize the PSG: all sounds off, both ports output */
|
||||
sound_ym.rd_data_reg_sel = 7;
|
||||
sound_ym.wd_data = 0xff;
|
||||
}
|
||||
|
||||
|
||||
static irqreturn_t atari_call_irq_list( int irq, void *dev_id, struct pt_regs *fp )
|
||||
{
|
||||
irq_node_t *node;
|
||||
|
||||
for (node = (irq_node_t *)dev_id; node; node = node->next)
|
||||
node->handler(irq, node->dev_id, fp);
|
||||
return IRQ_HANDLED;
|
||||
}
|
||||
|
||||
|
||||
/*
|
||||
* atari_request_irq : add an interrupt service routine for a particular
|
||||
* machine specific interrupt source.
|
||||
* If the addition was successful, it returns 0.
|
||||
*/
|
||||
|
||||
int atari_request_irq(unsigned int irq, irqreturn_t (*handler)(int, void *, struct pt_regs *),
|
||||
unsigned long flags, const char *devname, void *dev_id)
|
||||
{
|
||||
int vector;
|
||||
unsigned long oflags = flags;
|
||||
|
||||
/*
|
||||
* The following is a hack to make some PCI card drivers work,
|
||||
* which set the SA_SHIRQ flag.
|
||||
*/
|
||||
|
||||
flags &= ~SA_SHIRQ;
|
||||
|
||||
if (flags == SA_INTERRUPT) {
|
||||
printk ("%s: SA_INTERRUPT changed to IRQ_TYPE_SLOW for %s\n",
|
||||
__FUNCTION__, devname);
|
||||
flags = IRQ_TYPE_SLOW;
|
||||
}
|
||||
if (flags < IRQ_TYPE_SLOW || flags > IRQ_TYPE_PRIO) {
|
||||
printk ("%s: Bad irq type 0x%lx <0x%lx> requested from %s\n",
|
||||
__FUNCTION__, flags, oflags, devname);
|
||||
return -EINVAL;
|
||||
}
|
||||
if (!IS_VALID_INTNO(irq)) {
|
||||
printk ("%s: Unknown irq %d requested from %s\n",
|
||||
__FUNCTION__, irq, devname);
|
||||
return -ENXIO;
|
||||
}
|
||||
vector = IRQ_SOURCE_TO_VECTOR(irq);
|
||||
|
||||
/*
|
||||
* Check type/source combination: slow ints are (currently)
|
||||
* only possible for MFP-interrupts.
|
||||
*/
|
||||
if (flags == IRQ_TYPE_SLOW &&
|
||||
(irq < STMFP_SOURCE_BASE || irq >= SCC_SOURCE_BASE)) {
|
||||
printk ("%s: Slow irq requested for non-MFP source %d from %s\n",
|
||||
__FUNCTION__, irq, devname);
|
||||
return -EINVAL;
|
||||
}
|
||||
|
||||
if (vectors[vector] == bad_interrupt) {
|
||||
/* int has no handler yet */
|
||||
irq_handler[irq].handler = handler;
|
||||
irq_handler[irq].dev_id = dev_id;
|
||||
irq_param[irq].flags = flags;
|
||||
irq_param[irq].devname = devname;
|
||||
vectors[vector] =
|
||||
(flags == IRQ_TYPE_SLOW) ? slow_handlers[irq-STMFP_SOURCE_BASE] :
|
||||
(flags == IRQ_TYPE_FAST) ? atari_fast_irq_handler :
|
||||
atari_prio_irq_handler;
|
||||
/* If MFP int, also enable and umask it */
|
||||
atari_turnon_irq(irq);
|
||||
atari_enable_irq(irq);
|
||||
|
||||
return 0;
|
||||
}
|
||||
else if (irq_param[irq].flags == flags) {
|
||||
/* old handler is of same type -> handlers can be chained */
|
||||
irq_node_t *node;
|
||||
unsigned long flags;
|
||||
|
||||
local_irq_save(flags);
|
||||
|
||||
if (irq_handler[irq].handler != atari_call_irq_list) {
|
||||
/* Only one handler yet, make a node for this first one */
|
||||
if (!(node = new_irq_node()))
|
||||
return -ENOMEM;
|
||||
node->handler = irq_handler[irq].handler;
|
||||
node->dev_id = irq_handler[irq].dev_id;
|
||||
node->devname = irq_param[irq].devname;
|
||||
node->next = NULL;
|
||||
|
||||
irq_handler[irq].handler = atari_call_irq_list;
|
||||
irq_handler[irq].dev_id = node;
|
||||
irq_param[irq].devname = "chained";
|
||||
}
|
||||
|
||||
if (!(node = new_irq_node()))
|
||||
return -ENOMEM;
|
||||
node->handler = handler;
|
||||
node->dev_id = dev_id;
|
||||
node->devname = devname;
|
||||
/* new handlers are put in front of the queue */
|
||||
node->next = irq_handler[irq].dev_id;
|
||||
irq_handler[irq].dev_id = node;
|
||||
|
||||
local_irq_restore(flags);
|
||||
return 0;
|
||||
} else {
|
||||
printk ("%s: Irq %d allocated by other type int (call from %s)\n",
|
||||
__FUNCTION__, irq, devname);
|
||||
return -EBUSY;
|
||||
}
|
||||
}
|
||||
|
||||
void atari_free_irq(unsigned int irq, void *dev_id)
|
||||
{
|
||||
unsigned long flags;
|
||||
int vector;
|
||||
irq_node_t **list, *node;
|
||||
|
||||
if (!IS_VALID_INTNO(irq)) {
|
||||
printk("%s: Unknown irq %d\n", __FUNCTION__, irq);
|
||||
return;
|
||||
}
|
||||
|
||||
vector = IRQ_SOURCE_TO_VECTOR(irq);
|
||||
if (vectors[vector] == bad_interrupt)
|
||||
goto not_found;
|
||||
|
||||
local_irq_save(flags);
|
||||
|
||||
if (irq_handler[irq].handler != atari_call_irq_list) {
|
||||
/* It's the only handler for the interrupt */
|
||||
if (irq_handler[irq].dev_id != dev_id) {
|
||||
local_irq_restore(flags);
|
||||
goto not_found;
|
||||
}
|
||||
irq_handler[irq].handler = NULL;
|
||||
irq_handler[irq].dev_id = NULL;
|
||||
irq_param[irq].devname = NULL;
|
||||
vectors[vector] = bad_interrupt;
|
||||
/* If MFP int, also disable it */
|
||||
atari_disable_irq(irq);
|
||||
atari_turnoff_irq(irq);
|
||||
|
||||
local_irq_restore(flags);
|
||||
return;
|
||||
}
|
||||
|
||||
/* The interrupt is chained, find the irq on the list */
|
||||
for(list = (irq_node_t **)&irq_handler[irq].dev_id; *list; list = &(*list)->next) {
|
||||
if ((*list)->dev_id == dev_id) break;
|
||||
}
|
||||
if (!*list) {
|
||||
local_irq_restore(flags);
|
||||
goto not_found;
|
||||
}
|
||||
|
||||
(*list)->handler = NULL; /* Mark it as free for reallocation */
|
||||
*list = (*list)->next;
|
||||
|
||||
/* If there's now only one handler, unchain the interrupt, i.e. plug in
|
||||
* the handler directly again and omit atari_call_irq_list */
|
||||
node = (irq_node_t *)irq_handler[irq].dev_id;
|
||||
if (node && !node->next) {
|
||||
irq_handler[irq].handler = node->handler;
|
||||
irq_handler[irq].dev_id = node->dev_id;
|
||||
irq_param[irq].devname = node->devname;
|
||||
node->handler = NULL; /* Mark it as free for reallocation */
|
||||
}
|
||||
|
||||
local_irq_restore(flags);
|
||||
return;
|
||||
|
||||
not_found:
|
||||
printk("%s: tried to remove invalid irq\n", __FUNCTION__);
|
||||
return;
|
||||
}
|
||||
|
||||
|
||||
/*
|
||||
* atari_register_vme_int() returns the number of a free interrupt vector for
|
||||
* hardware with a programmable int vector (probably a VME board).
|
||||
*/
|
||||
|
||||
unsigned long atari_register_vme_int(void)
|
||||
{
|
||||
int i;
|
||||
|
||||
for(i = 0; i < 32; i++)
|
||||
if((free_vme_vec_bitmap & (1 << i)) == 0)
|
||||
break;
|
||||
|
||||
if(i == 16)
|
||||
return 0;
|
||||
|
||||
free_vme_vec_bitmap |= 1 << i;
|
||||
return (VME_SOURCE_BASE + i);
|
||||
}
|
||||
|
||||
|
||||
void atari_unregister_vme_int(unsigned long irq)
|
||||
{
|
||||
if(irq >= VME_SOURCE_BASE && irq < VME_SOURCE_BASE + VME_MAX_SOURCES) {
|
||||
irq -= VME_SOURCE_BASE;
|
||||
free_vme_vec_bitmap &= ~(1 << irq);
|
||||
}
|
||||
}
|
||||
|
||||
|
||||
int show_atari_interrupts(struct seq_file *p, void *v)
|
||||
{
|
||||
int i;
|
||||
|
||||
for (i = 0; i < NUM_INT_SOURCES; ++i) {
|
||||
if (vectors[IRQ_SOURCE_TO_VECTOR(i)] == bad_interrupt)
|
||||
continue;
|
||||
if (i < STMFP_SOURCE_BASE)
|
||||
seq_printf(p, "auto %2d: %10u ",
|
||||
i, kstat_cpu(0).irqs[i]);
|
||||
else
|
||||
seq_printf(p, "vec $%02x: %10u ",
|
||||
IRQ_SOURCE_TO_VECTOR(i),
|
||||
kstat_cpu(0).irqs[i]);
|
||||
|
||||
if (irq_handler[i].handler != atari_call_irq_list) {
|
||||
seq_printf(p, "%s\n", irq_param[i].devname);
|
||||
}
|
||||
else {
|
||||
irq_node_t *n;
|
||||
for( n = (irq_node_t *)irq_handler[i].dev_id; n; n = n->next ) {
|
||||
seq_printf(p, "%s\n", n->devname);
|
||||
if (n->next)
|
||||
seq_puts(p, " " );
|
||||
}
|
||||
}
|
||||
}
|
||||
if (num_spurious)
|
||||
seq_printf(p, "spurio.: %10u\n", num_spurious);
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
|
||||
Reference in New Issue
Block a user