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Linux/arch/sh/kernel/cpu/irq/imask.c

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  1 // SPDX-License-Identifier: GPL-2.0
  2 /*
  3  * arch/sh/kernel/cpu/irq/imask.c
  4  *
  5  * Copyright (C) 1999, 2000  Niibe Yutaka
  6  *
  7  * Simple interrupt handling using IMASK of SR register.
  8  *
  9  */
 10 /* NOTE: Will not work on level 15 */
 11 #include <linux/ptrace.h>
 12 #include <linux/errno.h>
 13 #include <linux/kernel_stat.h>
 14 #include <linux/signal.h>
 15 #include <linux/sched.h>
 16 #include <linux/interrupt.h>
 17 #include <linux/init.h>
 18 #include <linux/bitops.h>
 19 #include <linux/spinlock.h>
 20 #include <linux/cache.h>
 21 #include <linux/irq.h>
 22 #include <linux/bitmap.h>
 23 #include <asm/irq.h>
 24 
 25 /* Bitmap of IRQ masked */
 26 #define IMASK_PRIORITY  15
 27 
 28 static DECLARE_BITMAP(imask_mask, IMASK_PRIORITY);
 29 static int interrupt_priority;
 30 
 31 static inline void set_interrupt_registers(int ip)
 32 {
 33         unsigned long __dummy;
 34 
 35         asm volatile(
 36 #ifdef CONFIG_CPU_HAS_SR_RB
 37                      "ldc       %2, r6_bank\n\t"
 38 #endif
 39                      "stc       sr, %0\n\t"
 40                      "and       #0xf0, %0\n\t"
 41                      "shlr2     %0\n\t"
 42                      "cmp/eq    #0x3c, %0\n\t"
 43                      "bt/s      1f      ! CLI-ed\n\t"
 44                      " stc      sr, %0\n\t"
 45                      "and       %1, %0\n\t"
 46                      "or        %2, %0\n\t"
 47                      "ldc       %0, sr\n"
 48                      "1:"
 49                      : "=&z" (__dummy)
 50                      : "r" (~0xf0), "r" (ip << 4)
 51                      : "t");
 52 }
 53 
 54 static void mask_imask_irq(struct irq_data *data)
 55 {
 56         unsigned int irq = data->irq;
 57 
 58         clear_bit(irq, imask_mask);
 59         if (interrupt_priority < IMASK_PRIORITY - irq)
 60                 interrupt_priority = IMASK_PRIORITY - irq;
 61         set_interrupt_registers(interrupt_priority);
 62 }
 63 
 64 static void unmask_imask_irq(struct irq_data *data)
 65 {
 66         unsigned int irq = data->irq;
 67 
 68         set_bit(irq, imask_mask);
 69         interrupt_priority = IMASK_PRIORITY -
 70                 find_first_zero_bit(imask_mask, IMASK_PRIORITY);
 71         set_interrupt_registers(interrupt_priority);
 72 }
 73 
 74 static struct irq_chip imask_irq_chip = {
 75         .name           = "SR.IMASK",
 76         .irq_mask       = mask_imask_irq,
 77         .irq_unmask     = unmask_imask_irq,
 78         .irq_mask_ack   = mask_imask_irq,
 79 };
 80 
 81 void make_imask_irq(unsigned int irq)
 82 {
 83         irq_set_chip_and_handler_name(irq, &imask_irq_chip, handle_level_irq,
 84                                       "level");
 85 }
 86 

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