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   1 /*
   2  * arch/sh/kernel/cpu/irq/pint.c - Interrupt handling for PINT-based IRQs.
   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  *
   8  * This file is subject to the terms and conditions of the GNU General Public
   9  * License.  See the file "COPYING" in the main directory of this archive
  10  * for more details.
  11  */
  12
  13 #include <linux/init.h>
  14 #include <linux/irq.h>
  15 #include <linux/module.h>
  16
  17 #include <asm/system.h>
  18 #include <asm/io.h>
  19 #include <asm/machvec.h>
  20
  21 static unsigned char pint_map[256];
  22 static unsigned long portcr_mask;
  23
  24 static void enable_pint_irq(unsigned int irq);
  25 static void disable_pint_irq(unsigned int irq);
  26
  27 /* shutdown is same as "disable" */
  28 #define shutdown_pint_irq disable_pint_irq
  29
  30 static void mask_and_ack_pint(unsigned int);
  31 static void end_pint_irq(unsigned int irq);
  32
  33 static unsigned int startup_pint_irq(unsigned int irq)
  34 {
  35         enable_pint_irq(irq);
  36         return 0; /* never anything pending */
  37 }
  38
  39 static struct hw_interrupt_type pint_irq_type = {
  40         .typename = "PINT-IRQ",
  41         .startup = startup_pint_irq,
  42         .shutdown = shutdown_pint_irq,
  43         .enable = enable_pint_irq,
  44         .disable = disable_pint_irq,
  45         .ack = mask_and_ack_pint,
  46         .end = end_pint_irq
  47 };
  48
  49 static void disable_pint_irq(unsigned int irq)
  50 {
  51         unsigned long val;
  52
  53         val = ctrl_inw(INTC_INTER);
  54         val &= ~(1 << (irq - PINT_IRQ_BASE));
  55         ctrl_outw(val, INTC_INTER);     /* disable PINTn */
  56         portcr_mask &= ~(3 << (irq - PINT_IRQ_BASE)*2);
  57 }
  58
  59 static void enable_pint_irq(unsigned int irq)
  60 {
  61         unsigned long val;
  62
  63         val = ctrl_inw(INTC_INTER);
  64         val |= 1 << (irq - PINT_IRQ_BASE);
  65         ctrl_outw(val, INTC_INTER);     /* enable PINTn */
  66         portcr_mask |= 3 << (irq - PINT_IRQ_BASE)*2;
  67 }
  68
  69 static void mask_and_ack_pint(unsigned int irq)
  70 {
  71         disable_pint_irq(irq);
  72 }
  73
  74 static void end_pint_irq(unsigned int irq)
  75 {
  76         if (!(irq_desc[irq].status & (IRQ_DISABLED|IRQ_INPROGRESS)))
  77                 enable_pint_irq(irq);
  78 }
  79
  80 void make_pint_irq(unsigned int irq)
  81 {
  82         disable_irq_nosync(irq);
  83         irq_desc[irq].chip = &pint_irq_type;
  84         disable_pint_irq(irq);
  85 }
  86
  87 static struct ipr_data pint_ipr_map[] = {
  88         { PINT0_IRQ, PINT0_IPR_ADDR, PINT0_IPR_POS, PINT0_PRIORITY },
  89         { PINT8_IRQ, PINT8_IPR_ADDR, PINT8_IPR_POS, PINT8_PRIORITY },
  90 };
  91
  92 void __init init_IRQ_pint(void)
  93 {
  94         int i;
  95
  96         make_ipr_irq(pint_ipr_map, ARRAY_SIZE(pint_ipr_map));
  97
  98         enable_irq(PINT0_IRQ);
  99         enable_irq(PINT8_IRQ);
 100
 101         for(i = 0; i < 16; i++)
 102                 make_pint_irq(PINT_IRQ_BASE + i);
 103
 104         for(i = 0; i < 256; i++) {
 105                 if (i & 1)
 106                         pint_map[i] = 0;
 107                 else if (i & 2)
 108                         pint_map[i] = 1;
 109                 else if (i & 4)
 110                         pint_map[i] = 2;
 111                 else if (i & 8)
 112                         pint_map[i] = 3;
 113                 else if (i & 0x10)
 114                         pint_map[i] = 4;
 115                 else if (i & 0x20)
 116                         pint_map[i] = 5;
 117                 else if (i & 0x40)
 118                         pint_map[i] = 6;
 119                 else if (i & 0x80)
 120                         pint_map[i] = 7;
 121         }
 122 }
 123
 124 int ipr_irq_demux(int irq)
 125 {
 126         unsigned long creg, dreg, d, sav;
 127
 128         if (irq == PINT0_IRQ) {
 129 #if defined(CONFIG_CPU_SUBTYPE_SH7707)
 130                 creg = PORT_PACR;
 131                 dreg = PORT_PADR;
 132 #else
 133                 creg = PORT_PCCR;
 134                 dreg = PORT_PCDR;
 135 #endif
 136                 sav = ctrl_inw(creg);
 137                 ctrl_outw(sav | portcr_mask, creg);
 138                 d = (~ctrl_inb(dreg) ^ ctrl_inw(INTC_ICR2)) &
 139                         ctrl_inw(INTC_INTER) & 0xff;
 140                 ctrl_outw(sav, creg);
 141
 142                 if (d == 0)
 143                         return irq;
 144
 145                 return PINT_IRQ_BASE + pint_map[d];
 146         } else if (irq == PINT8_IRQ) {
 147 #if defined(CONFIG_CPU_SUBTYPE_SH7707)
 148                 creg = PORT_PBCR;
 149                 dreg = PORT_PBDR;
 150 #else
 151                 creg = PORT_PFCR;
 152                 dreg = PORT_PFDR;
 153 #endif
 154                 sav = ctrl_inw(creg);
 155                 ctrl_outw(sav | (portcr_mask >> 16), creg);
 156                 d = (~ctrl_inb(dreg) ^ (ctrl_inw(INTC_ICR2) >> 8)) &
 157                         (ctrl_inw(INTC_INTER) >> 8) & 0xff;
 158                 ctrl_outw(sav, creg);
 159
 160                 if (d == 0)
 161                         return irq;
 162
 163                 return PINT_IRQ_BASE + 8 + pint_map[d];
 164         }
 165
 166         return irq;
 167 }
 168