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(unsigned int irq)
  21 {
  22         unsigned short nimr;
  23         unsigned short mask = 1 << (irq - HD64461_IRQBASE);
  24
  25         nimr = __raw_readw(HD64461_NIMR);
  26         nimr |= mask;
  27         __raw_writew(nimr, HD64461_NIMR);
  28 }
  29
  30 static void hd64461_unmask_irq(unsigned int irq)
  31 {
  32         unsigned short nimr;
  33         unsigned short mask = 1 << (irq - HD64461_IRQBASE);
  34
  35         nimr = __raw_readw(HD64461_NIMR);
  36         nimr &= ~mask;
  37         __raw_writew(nimr, HD64461_NIMR);
  38 }
  39
  40 static void hd64461_mask_and_ack_irq(unsigned int irq)
  41 {
  42         hd64461_mask_irq(irq);
  43 #ifdef CONFIG_HD64461_ENABLER
  44         if (irq == HD64461_IRQBASE + 13)
  45                 __raw_writeb(0x00, HD64461_PCC1CSCR);
  46 #endif
  47 }
  48
  49 static struct irq_chip hd64461_irq_chip = {
  50         .name           = "HD64461-IRQ",
  51         .mask           = hd64461_mask_irq,
  52         .mask_ack       = hd64461_mask_and_ack_irq,
  53         .unmask         = hd64461_unmask_irq,
  54 };
  55
  56 static void hd64461_irq_demux(unsigned int irq, struct irq_desc *desc)
  57 {
  58         unsigned short intv = __raw_readw(HD64461_NIRR);
  59         unsigned int ext_irq = HD64461_IRQBASE;
  60
  61         intv &= (1 << HD64461_IRQ_NUM) - 1;
  62
  63         for (; intv; intv >>= 1, ext_irq++) {
  64                 if (!(intv & 1))
  65                         continue;
  66
  67                 generic_handle_irq(ext_irq);
  68         }
  69 }
  70
  71 int __init setup_hd64461(void)
  72 {
  73         int i, nid = cpu_to_node(boot_cpu_data);
  74
  75         if (!MACH_HD64461)
  76                 return 0;
  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 80 -> 95 belongs to HD64461  */
  90         for (i = HD64461_IRQBASE; i < HD64461_IRQBASE + 16; i++) {
  91                 unsigned int irq;
  92
  93                 irq = create_irq_nr(i, nid);
  94                 if (unlikely(irq == 0)) {
  95                         pr_err("%s: failed hooking irq %d for HD64461\n",
  96                                __func__, i);
  97                         return -EBUSY;
  98                 }
  99
 100                 if (unlikely(irq != i)) {
 101                         pr_err("%s: got irq %d but wanted %d, bailing.\n",
 102                                __func__, irq, i);
 103                         destroy_irq(irq);
 104                         return -EINVAL;
 105                 }
 106
 107                 set_irq_chip_and_handler(i, &hd64461_irq_chip,
 108                                          handle_level_irq);
 109         }
 110
 111         set_irq_chained_handler(CONFIG_HD64461_IRQ, hd64461_irq_demux);
 112         set_irq_type(CONFIG_HD64461_IRQ, IRQ_TYPE_LEVEL_LOW);
 113
 114 #ifdef CONFIG_HD64461_ENABLER
 115         printk(KERN_INFO "HD64461: enabling PCMCIA devices\n");
 116         __raw_writeb(0x4c, HD64461_PCC1CSCIER);
 117         __raw_writeb(0x00, HD64461_PCC1CSCR);
 118 #endif
 119
 120         return 0;
 121 }
 122
 123 module_init(setup_hd64461);