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   1 /*
   2  * linux/arch/sh/boards/se/7206/irq.c
   3  *
   4  * Copyright (C) 2005,2006 Yoshinori Sato
   5  *
   6  * Hitachi SolutionEngine Support.
   7  *
   8  */
   9 #include <linux/init.h>
  10 #include <linux/irq.h>
  11 #include <linux/io.h>
  12 #include <linux/interrupt.h>
  13 #include <mach-se/mach/se7206.h>
  14
  15 #define INTSTS0 0x31800000
  16 #define INTSTS1 0x31800002
  17 #define INTMSK0 0x31800004
  18 #define INTMSK1 0x31800006
  19 #define INTSEL  0x31800008
  20
  21 #define IRQ0_IRQ 64
  22 #define IRQ1_IRQ 65
  23 #define IRQ3_IRQ 67
  24
  25 #define INTC_IPR01 0xfffe0818
  26 #define INTC_ICR1  0xfffe0802
  27
  28 static void disable_se7206_irq(struct irq_data *data)
  29 {
  30         unsigned int irq = data->irq;
  31         unsigned short val;
  32         unsigned short mask = 0xffff ^ (0x0f << 4 * (3 - (IRQ0_IRQ - irq)));
  33         unsigned short msk0,msk1;
  34
  35         /* Set the priority in IPR to 0 */
  36         val = __raw_readw(INTC_IPR01);
  37         val &= mask;
  38         __raw_writew(val, INTC_IPR01);
  39         /* FPGA mask set */
  40         msk0 = __raw_readw(INTMSK0);
  41         msk1 = __raw_readw(INTMSK1);
  42
  43         switch (irq) {
  44         case IRQ0_IRQ:
  45                 msk0 |= 0x0010;
  46                 break;
  47         case IRQ1_IRQ:
  48                 msk0 |= 0x000f;
  49                 break;
  50         case IRQ3_IRQ:
  51                 msk0 |= 0x0f00;
  52                 msk1 |= 0x00ff;
  53                 break;
  54         }
  55         __raw_writew(msk0, INTMSK0);
  56         __raw_writew(msk1, INTMSK1);
  57 }
  58
  59 static void enable_se7206_irq(struct irq_data *data)
  60 {
  61         unsigned int irq = data->irq;
  62         unsigned short val;
  63         unsigned short value = (0x0001 << 4 * (3 - (IRQ0_IRQ - irq)));
  64         unsigned short msk0,msk1;
  65
  66         /* Set priority in IPR back to original value */
  67         val = __raw_readw(INTC_IPR01);
  68         val |= value;
  69         __raw_writew(val, INTC_IPR01);
  70
  71         /* FPGA mask reset */
  72         msk0 = __raw_readw(INTMSK0);
  73         msk1 = __raw_readw(INTMSK1);
  74
  75         switch (irq) {
  76         case IRQ0_IRQ:
  77                 msk0 &= ~0x0010;
  78                 break;
  79         case IRQ1_IRQ:
  80                 msk0 &= ~0x000f;
  81                 break;
  82         case IRQ3_IRQ:
  83                 msk0 &= ~0x0f00;
  84                 msk1 &= ~0x00ff;
  85                 break;
  86         }
  87         __raw_writew(msk0, INTMSK0);
  88         __raw_writew(msk1, INTMSK1);
  89 }
  90
  91 static void eoi_se7206_irq(struct irq_data *data)
  92 {
  93         unsigned short sts0,sts1;
  94         unsigned int irq = data->irq;
  95
  96         if (!irqd_irq_disabled(data) && !irqd_irq_inprogress(data))
  97                 enable_se7206_irq(data);
  98         /* FPGA isr clear */
  99         sts0 = __raw_readw(INTSTS0);
 100         sts1 = __raw_readw(INTSTS1);
 101
 102         switch (irq) {
 103         case IRQ0_IRQ:
 104                 sts0 &= ~0x0010;
 105                 break;
 106         case IRQ1_IRQ:
 107                 sts0 &= ~0x000f;
 108                 break;
 109         case IRQ3_IRQ:
 110                 sts0 &= ~0x0f00;
 111                 sts1 &= ~0x00ff;
 112                 break;
 113         }
 114         __raw_writew(sts0, INTSTS0);
 115         __raw_writew(sts1, INTSTS1);
 116 }
 117
 118 static struct irq_chip se7206_irq_chip __read_mostly = {
 119         .name           = "SE7206-FPGA",
 120         .irq_mask       = disable_se7206_irq,
 121         .irq_unmask     = enable_se7206_irq,
 122         .irq_eoi        = eoi_se7206_irq,
 123 };
 124
 125 static void make_se7206_irq(unsigned int irq)
 126 {
 127         disable_irq_nosync(irq);
 128         set_irq_chip_and_handler_name(irq, &se7206_irq_chip,
 129                                       handle_level_irq, "level");
 130         disable_se7206_irq(irq_get_irq_data(irq));
 131 }
 132
 133 /*
 134  * Initialize IRQ setting
 135  */
 136 void __init init_se7206_IRQ(void)
 137 {
 138         make_se7206_irq(IRQ0_IRQ); /* SMC91C111 */
 139         make_se7206_irq(IRQ1_IRQ); /* ATA */
 140         make_se7206_irq(IRQ3_IRQ); /* SLOT / PCM */
 141
 142         __raw_writew(__raw_readw(INTC_ICR1) | 0x000b, INTC_ICR1); /* ICR1 */
 143
 144         /* FPGA System register setup*/
 145         __raw_writew(0x0000,INTSTS0); /* Clear INTSTS0 */
 146         __raw_writew(0x0000,INTSTS1); /* Clear INTSTS1 */
 147
 148         /* IRQ0=LAN, IRQ1=ATA, IRQ3=SLT,PCM */
 149         __raw_writew(0x0001,INTSEL);
 150 }