arch/sh/cchips/hd6446x/hd64461.c

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