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Message-Id: <1319978915-10933-14-git-send-email-geert@linux-m68k.org>
Date: Sun, 30 Oct 2011 13:48:21 +0100
From: Geert Uytterhoeven <geert@...ux-m68k.org>
To: linux-m68k@...r.kernel.org
Cc: linux-kernel@...r.kernel.org, Greg Ungerer <gerg@...inux.org>,
Geert Uytterhoeven <geert@...ux-m68k.org>
Subject: [PATCH 13/27] m68k/atari: Remove code and comments about different irq types
This code was obsoleted during the irq restructuring in 2006.
Signed-off-by: Geert Uytterhoeven <geert@...ux-m68k.org>
---
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 6149ff9..af54455 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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