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(unsigned int irq, 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 i, nid = cpu_to_node(boot_cpu_data);
  77
  78         if (!MACH_HD64461)
  79                 return 0;
  80
  81         printk(KERN_INFO
  82                "HD64461 configured at 0x%x on irq %d(mapped into %d to %d)\n",
  83                HD64461_IOBASE, CONFIG_HD64461_IRQ, HD64461_IRQBASE,
  84                HD64461_IRQBASE + 15);
  85
  86 /* Should be at processor specific part.. */
  87 #if defined(CONFIG_CPU_SUBTYPE_SH7709)
  88         __raw_writew(0x2240, INTC_ICR1);
  89 #endif
  90         __raw_writew(0xffff, HD64461_NIMR);
  91
  92         /*  IRQ 80 -> 95 belongs to HD64461  */
  93         for (i = HD64461_IRQBASE; i < HD64461_IRQBASE + 16; i++) {
  94                 unsigned int irq;
  95
  96                 irq = create_irq_nr(i, nid);
  97                 if (unlikely(irq == 0)) {
  98                         pr_err("%s: failed hooking irq %d for HD64461\n",
  99                                __func__, i);
 100                         return -EBUSY;
 101                 }
 102
 103                 if (unlikely(irq != i)) {
 104                         pr_err("%s: got irq %d but wanted %d, bailing.\n",
 105                                __func__, irq, i);
 106                         destroy_irq(irq);
 107                         return -EINVAL;
 108                 }
 109
 110                 set_irq_chip_and_handler(i, &hd64461_irq_chip,
 111                                          handle_level_irq);
 112         }
 113
 114         set_irq_chained_handler(CONFIG_HD64461_IRQ, hd64461_irq_demux);
 115         set_irq_type(CONFIG_HD64461_IRQ, IRQ_TYPE_LEVEL_LOW);
 116
 117 #ifdef CONFIG_HD64461_ENABLER
 118         printk(KERN_INFO "HD64461: enabling PCMCIA devices\n");
 119         __raw_writeb(0x4c, HD64461_PCC1CSCIER);
 120         __raw_writeb(0x00, HD64461_PCC1CSCR);
 121 #endif
 122
 123         return 0;
 124 }
 125
 126 module_init(setup_hd64461);