arch/sh/boards/mach-se/7206/irq.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /*
   3  * linux/arch/sh/boards/se/7206/irq.c
   4  *
   5  * Copyright (C) 2005,2006 Yoshinori Sato
   6  *
   7  * Hitachi SolutionEngine Support.
   8  *
   9  */
  10 #include <linux/init.h>
  11 #include <linux/irq.h>
  12 #include <linux/io.h>
  13 #include <linux/interrupt.h>
  14 #include <mach-se/mach/se7206.h>
  15
  16 #define INTSTS0 0x31800000
  17 #define INTSTS1 0x31800002
  18 #define INTMSK0 0x31800004
  19 #define INTMSK1 0x31800006
  20 #define INTSEL  0x31800008
  21
  22 #define IRQ0_IRQ 64
  23 #define IRQ1_IRQ 65
  24 #define IRQ3_IRQ 67
  25
  26 #define INTC_IPR01 0xfffe0818
  27 #define INTC_ICR1  0xfffe0802
  28
  29 static void disable_se7206_irq(struct irq_data *data)
  30 {
  31         unsigned int irq = data->irq;
  32         unsigned short val;
  33         unsigned short mask = 0xffff ^ (0x0f << 4 * (3 - (IRQ0_IRQ - irq)));
  34         unsigned short msk0,msk1;
  35
  36         /* Set the priority in IPR to 0 */
  37         val = __raw_readw(INTC_IPR01);
  38         val &= mask;
  39         __raw_writew(val, INTC_IPR01);
  40         /* FPGA mask set */
  41         msk0 = __raw_readw(INTMSK0);
  42         msk1 = __raw_readw(INTMSK1);
  43
  44         switch (irq) {
  45         case IRQ0_IRQ:
  46                 msk0 |= 0x0010;
  47                 break;
  48         case IRQ1_IRQ:
  49                 msk0 |= 0x000f;
  50                 break;
  51         case IRQ3_IRQ:
  52                 msk0 |= 0x0f00;
  53                 msk1 |= 0x00ff;
  54                 break;
  55         }
  56         __raw_writew(msk0, INTMSK0);
  57         __raw_writew(msk1, INTMSK1);
  58 }
  59
  60 static void enable_se7206_irq(struct irq_data *data)
  61 {
  62         unsigned int irq = data->irq;
  63         unsigned short val;
  64         unsigned short value = (0x0001 << 4 * (3 - (IRQ0_IRQ - irq)));
  65         unsigned short msk0,msk1;
  66
  67         /* Set priority in IPR back to original value */
  68         val = __raw_readw(INTC_IPR01);
  69         val |= value;
  70         __raw_writew(val, INTC_IPR01);
  71
  72         /* FPGA mask reset */
  73         msk0 = __raw_readw(INTMSK0);
  74         msk1 = __raw_readw(INTMSK1);
  75
  76         switch (irq) {
  77         case IRQ0_IRQ:
  78                 msk0 &= ~0x0010;
  79                 break;
  80         case IRQ1_IRQ:
  81                 msk0 &= ~0x000f;
  82                 break;
  83         case IRQ3_IRQ:
  84                 msk0 &= ~0x0f00;
  85                 msk1 &= ~0x00ff;
  86                 break;
  87         }
  88         __raw_writew(msk0, INTMSK0);
  89         __raw_writew(msk1, INTMSK1);
  90 }
  91
  92 static void eoi_se7206_irq(struct irq_data *data)
  93 {
  94         unsigned short sts0,sts1;
  95         unsigned int irq = data->irq;
  96
  97         if (!irqd_irq_disabled(data) && !irqd_irq_inprogress(data))
  98                 enable_se7206_irq(data);
  99         /* FPGA isr clear */
 100         sts0 = __raw_readw(INTSTS0);
 101         sts1 = __raw_readw(INTSTS1);
 102
 103         switch (irq) {
 104         case IRQ0_IRQ:
 105                 sts0 &= ~0x0010;
 106                 break;
 107         case IRQ1_IRQ:
 108                 sts0 &= ~0x000f;
 109                 break;
 110         case IRQ3_IRQ:
 111                 sts0 &= ~0x0f00;
 112                 sts1 &= ~0x00ff;
 113                 break;
 114         }
 115         __raw_writew(sts0, INTSTS0);
 116         __raw_writew(sts1, INTSTS1);
 117 }
 118
 119 static struct irq_chip se7206_irq_chip __read_mostly = {
 120         .name           = "SE7206-FPGA",
 121         .irq_mask       = disable_se7206_irq,
 122         .irq_unmask     = enable_se7206_irq,
 123         .irq_eoi        = eoi_se7206_irq,
 124 };
 125
 126 static void make_se7206_irq(unsigned int irq)
 127 {
 128         disable_irq_nosync(irq);
 129         irq_set_chip_and_handler_name(irq, &se7206_irq_chip,
 130                                       handle_level_irq, "level");
 131         disable_se7206_irq(irq_get_irq_data(irq));
 132 }
 133
 134 /*
 135  * Initialize IRQ setting
 136  */
 137 void __init init_se7206_IRQ(void)
 138 {
 139         make_se7206_irq(IRQ0_IRQ); /* SMC91C111 */
 140         make_se7206_irq(IRQ1_IRQ); /* ATA */
 141         make_se7206_irq(IRQ3_IRQ); /* SLOT / PCM */
 142
 143         __raw_writew(__raw_readw(INTC_ICR1) | 0x000b, INTC_ICR1); /* ICR1 */
 144
 145         /* FPGA System register setup*/
 146         __raw_writew(0x0000,INTSTS0); /* Clear INTSTS0 */
 147         __raw_writew(0x0000,INTSTS1); /* Clear INTSTS1 */
 148
 149         /* IRQ0=LAN, IRQ1=ATA, IRQ3=SLT,PCM */
 150         __raw_writew(0x0001,INTSEL);
 151 }