arch/sh/cchips/hd6446x/hd64461.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /*
   3  *      Copyright (C) 2000 YAEGASHI Takeshi
   4  *      Hitachi HD64461 companion chip support
   5  */
   6
   7 #include <linux/sched.h>
   8 #include <linux/module.h>
   9 #include <linux/kernel.h>
  10 #include <linux/param.h>
  11 #include <linux/interrupt.h>
  12 #include <linux/init.h>
  13 #include <linux/irq.h>
  14 #include <linux/io.h>
  15 #include <asm/irq.h>
  16 #include <asm/hd64461.h>
  17
  18 /* This belongs in cpu specific */
  19 #define INTC_ICR1 0xA4140010UL
  20
  21 static void hd64461_mask_irq(struct irq_data *data)
  22 {
  23         unsigned int irq = data->irq;
  24         unsigned short nimr;
  25         unsigned short mask = 1 << (irq - HD64461_IRQBASE);
  26
  27         nimr = __raw_readw(HD64461_NIMR);
  28         nimr |= mask;
  29         __raw_writew(nimr, HD64461_NIMR);
  30 }
  31
  32 static void hd64461_unmask_irq(struct irq_data *data)
  33 {
  34         unsigned int irq = data->irq;
  35         unsigned short nimr;
  36         unsigned short mask = 1 << (irq - HD64461_IRQBASE);
  37
  38         nimr = __raw_readw(HD64461_NIMR);
  39         nimr &= ~mask;
  40         __raw_writew(nimr, HD64461_NIMR);
  41 }
  42
  43 static void hd64461_mask_and_ack_irq(struct irq_data *data)
  44 {
  45         hd64461_mask_irq(data);
  46
  47 #ifdef CONFIG_HD64461_ENABLER
  48         if (data->irq == HD64461_IRQBASE + 13)
  49                 __raw_writeb(0x00, HD64461_PCC1CSCR);
  50 #endif
  51 }
  52
  53 static struct irq_chip hd64461_irq_chip = {
  54         .name           = "HD64461-IRQ",
  55         .irq_mask       = hd64461_mask_irq,
  56         .irq_mask_ack   = hd64461_mask_and_ack_irq,
  57         .irq_unmask     = hd64461_unmask_irq,
  58 };
  59
  60 static void hd64461_irq_demux(struct irq_desc *desc)
  61 {
  62         unsigned short intv = __raw_readw(HD64461_NIRR);
  63         unsigned int ext_irq = HD64461_IRQBASE;
  64
  65         intv &= (1 << HD64461_IRQ_NUM) - 1;
  66
  67         for (; intv; intv >>= 1, ext_irq++) {
  68                 if (!(intv & 1))
  69                         continue;
  70
  71                 generic_handle_irq(ext_irq);
  72         }
  73 }
  74
  75 int __init setup_hd64461(void)
  76 {
  77         int irq_base, i;
  78
  79         printk(KERN_INFO
  80                "HD64461 configured at 0x%x on irq %d(mapped into %d to %d)\n",
  81                HD64461_IOBASE, CONFIG_HD64461_IRQ, HD64461_IRQBASE,
  82                HD64461_IRQBASE + 15);
  83
  84 /* Should be at processor specific part.. */
  85 #if defined(CONFIG_CPU_SUBTYPE_SH7709)
  86         __raw_writew(0x2240, INTC_ICR1);
  87 #endif
  88         __raw_writew(0xffff, HD64461_NIMR);
  89
  90         irq_base = irq_alloc_descs(HD64461_IRQBASE, HD64461_IRQBASE, 16, -1);
  91         if (IS_ERR_VALUE(irq_base)) {
  92                 pr_err("%s: failed hooking irqs for HD64461\n", __func__);
  93                 return irq_base;
  94         }
  95
  96         for (i = 0; i < 16; i++)
  97                 irq_set_chip_and_handler(irq_base + i, &hd64461_irq_chip,
  98                                          handle_level_irq);
  99
 100         irq_set_chained_handler(CONFIG_HD64461_IRQ, hd64461_irq_demux);
 101         irq_set_irq_type(CONFIG_HD64461_IRQ, IRQ_TYPE_LEVEL_LOW);
 102
 103 #ifdef CONFIG_HD64461_ENABLER
 104         printk(KERN_INFO "HD64461: enabling PCMCIA devices\n");
 105         __raw_writeb(0x4c, HD64461_PCC1CSCIER);
 106         __raw_writeb(0x00, HD64461_PCC1CSCR);
 107 #endif
 108
 109         return 0;
 110 }
 111
 112 module_init(setup_hd64461);