arch/sh/kernel/cpu/irq/ipr.c

   1 /*
   2  * Interrupt handling for IPR-based IRQ.
   3  *
   4  * Copyright (C) 1999  Niibe Yutaka & Takeshi Yaegashi
   5  * Copyright (C) 2000  Kazumoto Kojima
   6  * Copyright (C) 2003  Takashi Kusuda <kusuda-takashi@hitachi-ul.co.jp>
   7  * Copyright (C) 2006  Paul Mundt
   8  *
   9  * Supported system:
  10  *      On-chip supporting modules (TMU, RTC, etc.).
  11  *      On-chip supporting modules for SH7709/SH7709A/SH7729/SH7300.
  12  *      Hitachi SolutionEngine external I/O:
  13  *              MS7709SE01, MS7709ASE01, and MS7750SE01
  14  *
  15  * This file is subject to the terms and conditions of the GNU General Public
  16  * License.  See the file "COPYING" in the main directory of this archive
  17  * for more details.
  18  */
  19 #include <linux/init.h>
  20 #include <linux/irq.h>
  21 #include <linux/module.h>
  22 #include <linux/io.h>
  23 #include <linux/interrupt.h>
  24
  25 static void disable_ipr_irq(unsigned int irq)
  26 {
  27         struct ipr_data *p = get_irq_chip_data(irq);
  28         /* Set the priority in IPR to 0 */
  29         ctrl_outw(ctrl_inw(p->addr) & (0xffff ^ (0xf << p->shift)), p->addr);
  30 }
  31
  32 static void enable_ipr_irq(unsigned int irq)
  33 {
  34         struct ipr_data *p = get_irq_chip_data(irq);
  35         /* Set priority in IPR back to original value */
  36         ctrl_outw(ctrl_inw(p->addr) | (p->priority << p->shift), p->addr);
  37 }
  38
  39 static struct irq_chip ipr_irq_chip = {
  40         .name           = "IPR",
  41         .mask           = disable_ipr_irq,
  42         .unmask         = enable_ipr_irq,
  43         .mask_ack       = disable_ipr_irq,
  44 };
  45
  46 unsigned int map_ipridx_to_addr(int idx) __attribute__ ((weak));
  47 unsigned int map_ipridx_to_addr(int idx)
  48 {
  49         return 0;
  50 }
  51
  52 void make_ipr_irq(struct ipr_data *table, unsigned int nr_irqs)
  53 {
  54         int i;
  55
  56         for (i = 0; i < nr_irqs; i++) {
  57                 unsigned int irq = table[i].irq;
  58
  59                 if (!irq)
  60                         irq = table[i].irq = i;
  61
  62                 /* could the IPR index be mapped, if not we ignore this */
  63                 if (!table[i].addr) {
  64                         table[i].addr = map_ipridx_to_addr(table[i].ipr_idx);
  65                         if (!table[i].addr)
  66                                 continue;
  67                 }
  68
  69                 disable_irq_nosync(irq);
  70                 set_irq_chip_and_handler_name(irq, &ipr_irq_chip,
  71                                       handle_level_irq, "level");
  72                 set_irq_chip_data(irq, &table[i]);
  73                 enable_ipr_irq(irq);
  74         }
  75 }
  76 EXPORT_SYMBOL(make_ipr_irq);
  77
  78 #if !defined(CONFIG_CPU_HAS_PINT_IRQ)
  79 int ipr_irq_demux(int irq)
  80 {
  81         return irq;
  82 }
  83 #endif