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    Subject[PATCH 15/28] m68k/atari: Remove code and comments about different irq types
    Date
    This code was obsoleted during the irq restructuring in 2006.

    Signed-off-by: Geert Uytterhoeven <geert@linux-m68k.org>
    ---
    v4: Added this changeset
    ---
    arch/m68k/atari/ataints.c | 236 ---------------------------------------------
    1 files changed, 0 insertions(+), 236 deletions(-)

    diff --git a/arch/m68k/atari/ataints.c b/arch/m68k/atari/ataints.c
    index ab3ac13..908bcfc 100644
    --- a/arch/m68k/atari/ataints.c
    +++ b/arch/m68k/atari/ataints.c
    @@ -60,244 +60,8 @@
    * <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.
    */

    -#if 0
    -
    -#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];
    -
    -/* 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 : &st_mfp.int_mk_a) \
    - : (n & 16 ? &tt_mfp.int_mk_b : &st_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 (;;);
    -}
    -#endif
    -
    /*
    * Bitmap for free interrupt vector numbers
    * (new vectors starting from 0x70 can be allocated by
    --
    1.7.0.4


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