arch/sh/kernel/cpu/irq/intc-sh5.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /*
   3  * arch/sh/kernel/cpu/irq/intc-sh5.c
   4  *
   5  * Interrupt Controller support for SH5 INTC.
   6  *
   7  * Copyright (C) 2000, 2001  Paolo Alberelli
   8  * Copyright (C) 2003  Paul Mundt
   9  *
  10  * Per-interrupt selective. IRLM=0 (Fixed priority) is not
  11  * supported being useless without a cascaded interrupt
  12  * controller.
  13  */
  14 #include <linux/init.h>
  15 #include <linux/interrupt.h>
  16 #include <linux/irq.h>
  17 #include <linux/io.h>
  18 #include <linux/kernel.h>
  19 #include <linux/bitops.h>
  20 #include <cpu/irq.h>
  21 #include <asm/page.h>
  22
  23 /*
  24  * Maybe the generic Peripheral block could move to a more
  25  * generic include file. INTC Block will be defined here
  26  * and only here to make INTC self-contained in a single
  27  * file.
  28  */
  29 #define INTC_BLOCK_OFFSET       0x01000000
  30
  31 /* Base */
  32 #define INTC_BASE               PHYS_PERIPHERAL_BLOCK + \
  33                                 INTC_BLOCK_OFFSET
  34
  35 /* Address */
  36 #define INTC_ICR_SET            (intc_virt + 0x0)
  37 #define INTC_ICR_CLEAR          (intc_virt + 0x8)
  38 #define INTC_INTPRI_0           (intc_virt + 0x10)
  39 #define INTC_INTSRC_0           (intc_virt + 0x50)
  40 #define INTC_INTSRC_1           (intc_virt + 0x58)
  41 #define INTC_INTREQ_0           (intc_virt + 0x60)
  42 #define INTC_INTREQ_1           (intc_virt + 0x68)
  43 #define INTC_INTENB_0           (intc_virt + 0x70)
  44 #define INTC_INTENB_1           (intc_virt + 0x78)
  45 #define INTC_INTDSB_0           (intc_virt + 0x80)
  46 #define INTC_INTDSB_1           (intc_virt + 0x88)
  47
  48 #define INTC_ICR_IRLM           0x1
  49 #define INTC_INTPRI_PREGS       8               /* 8 Priority Registers */
  50 #define INTC_INTPRI_PPREG       8               /* 8 Priorities per Register */
  51
  52
  53 /*
  54  * Mapper between the vector ordinal and the IRQ number
  55  * passed to kernel/device drivers.
  56  */
  57 int intc_evt_to_irq[(0xE20/0x20)+1] = {
  58         -1, -1, -1, -1, -1, -1, -1, -1, /* 0x000 - 0x0E0 */
  59         -1, -1, -1, -1, -1, -1, -1, -1, /* 0x100 - 0x1E0 */
  60          0,  0,  0,  0,  0,  1,  0,  0, /* 0x200 - 0x2E0 */
  61          2,  0,  0,  3,  0,  0,  0, -1, /* 0x300 - 0x3E0 */
  62         32, 33, 34, 35, 36, 37, 38, -1, /* 0x400 - 0x4E0 */
  63         -1, -1, -1, 63, -1, -1, -1, -1, /* 0x500 - 0x5E0 */
  64         -1, -1, 18, 19, 20, 21, 22, -1, /* 0x600 - 0x6E0 */
  65         39, 40, 41, 42, -1, -1, -1, -1, /* 0x700 - 0x7E0 */
  66          4,  5,  6,  7, -1, -1, -1, -1, /* 0x800 - 0x8E0 */
  67         -1, -1, -1, -1, -1, -1, -1, -1, /* 0x900 - 0x9E0 */
  68         12, 13, 14, 15, 16, 17, -1, -1, /* 0xA00 - 0xAE0 */
  69         -1, -1, -1, -1, -1, -1, -1, -1, /* 0xB00 - 0xBE0 */
  70         -1, -1, -1, -1, -1, -1, -1, -1, /* 0xC00 - 0xCE0 */
  71         -1, -1, -1, -1, -1, -1, -1, -1, /* 0xD00 - 0xDE0 */
  72         -1, -1                          /* 0xE00 - 0xE20 */
  73 };
  74
  75 static unsigned long intc_virt;
  76 static int irlm;                /* IRL mode */
  77
  78 static void enable_intc_irq(struct irq_data *data)
  79 {
  80         unsigned int irq = data->irq;
  81         unsigned long reg;
  82         unsigned long bitmask;
  83
  84         if ((irq <= IRQ_IRL3) && (irlm == NO_PRIORITY))
  85                 printk("Trying to use straight IRL0-3 with an encoding platform.\n");
  86
  87         if (irq < 32) {
  88                 reg = INTC_INTENB_0;
  89                 bitmask = 1 << irq;
  90         } else {
  91                 reg = INTC_INTENB_1;
  92                 bitmask = 1 << (irq - 32);
  93         }
  94
  95         __raw_writel(bitmask, reg);
  96 }
  97
  98 static void disable_intc_irq(struct irq_data *data)
  99 {
 100         unsigned int irq = data->irq;
 101         unsigned long reg;
 102         unsigned long bitmask;
 103
 104         if (irq < 32) {
 105                 reg = INTC_INTDSB_0;
 106                 bitmask = 1 << irq;
 107         } else {
 108                 reg = INTC_INTDSB_1;
 109                 bitmask = 1 << (irq - 32);
 110         }
 111
 112         __raw_writel(bitmask, reg);
 113 }
 114
 115 static struct irq_chip intc_irq_type = {
 116         .name = "INTC",
 117         .irq_enable = enable_intc_irq,
 118         .irq_disable = disable_intc_irq,
 119 };
 120
 121 void __init plat_irq_setup(void)
 122 {
 123         unsigned long long __dummy0, __dummy1=~0x00000000100000f0;
 124         unsigned long reg;
 125         int i;
 126
 127         intc_virt = (unsigned long)ioremap(INTC_BASE, 1024);
 128         if (!intc_virt) {
 129                 panic("Unable to remap INTC\n");
 130         }
 131
 132
 133         /* Set default: per-line enable/disable, priority driven ack/eoi */
 134         for (i = 0; i < NR_INTC_IRQS; i++)
 135                 irq_set_chip_and_handler(i, &intc_irq_type, handle_level_irq);
 136
 137
 138         /* Disable all interrupts and set all priorities to 0 to avoid trouble */
 139         __raw_writel(-1, INTC_INTDSB_0);
 140         __raw_writel(-1, INTC_INTDSB_1);
 141
 142         for (reg = INTC_INTPRI_0, i = 0; i < INTC_INTPRI_PREGS; i++, reg += 8)
 143                 __raw_writel( NO_PRIORITY, reg);
 144
 145
 146 #ifdef CONFIG_SH_CAYMAN
 147         {
 148                 unsigned long data;
 149
 150                 /* Set IRLM */
 151                 /* If all the priorities are set to 'no priority', then
 152                  * assume we are using encoded mode.
 153                  */
 154                 irlm = platform_int_priority[IRQ_IRL0] +
 155                        platform_int_priority[IRQ_IRL1] +
 156                        platform_int_priority[IRQ_IRL2] +
 157                        platform_int_priority[IRQ_IRL3];
 158                 if (irlm == NO_PRIORITY) {
 159                         /* IRLM = 0 */
 160                         reg = INTC_ICR_CLEAR;
 161                         i = IRQ_INTA;
 162                         printk("Trying to use encoded IRL0-3. IRLs unsupported.\n");
 163                 } else {
 164                         /* IRLM = 1 */
 165                         reg = INTC_ICR_SET;
 166                         i = IRQ_IRL0;
 167                 }
 168                 __raw_writel(INTC_ICR_IRLM, reg);
 169
 170                 /* Set interrupt priorities according to platform description */
 171                 for (data = 0, reg = INTC_INTPRI_0; i < NR_INTC_IRQS; i++) {
 172                         data |= platform_int_priority[i] <<
 173                                 ((i % INTC_INTPRI_PPREG) * 4);
 174                         if ((i % INTC_INTPRI_PPREG) == (INTC_INTPRI_PPREG - 1)) {
 175                                 /* Upon the 7th, set Priority Register */
 176                                 __raw_writel(data, reg);
 177                                 data = 0;
 178                                 reg += 8;
 179                         }
 180                 }
 181         }
 182 #endif
 183
 184         /*
 185          * And now let interrupts come in.
 186          * sti() is not enough, we need to
 187          * lower priority, too.
 188          */
 189         __asm__ __volatile__("getcon    " __SR ", %0\n\t"
 190                              "and       %0, %1, %0\n\t"
 191                              "putcon    %0, " __SR "\n\t"
 192                              : "=&r" (__dummy0)
 193                              : "r" (__dummy1));
 194 }