arch/sh/cchips/hd6446x/hd64465/setup.c

   1 /*
   2  * $Id: setup.c,v 1.4 2003/08/03 03:05:10 lethal Exp $
   3  *
   4  * Setup and IRQ handling code for the HD64465 companion chip.
   5  * by Greg Banks <gbanks@pocketpenguins.com>
   6  * Copyright (c) 2000 PocketPenguins Inc
   7  *
   8  * Derived from setup_hd64461.c which bore the message:
   9  * Copyright (C) 2000 YAEGASHI Takeshi
  10  */
  11
  12 #include <linux/sched.h>
  13 #include <linux/module.h>
  14 #include <linux/kernel.h>
  15 #include <linux/param.h>
  16 #include <linux/ioport.h>
  17 #include <linux/interrupt.h>
  18 #include <linux/init.h>
  19 #include <linux/irq.h>
  20 #include <asm/io.h>
  21 #include <asm/irq.h>
  22 #include <asm/hd64465/hd64465.h>
  23
  24 static void disable_hd64465_irq(unsigned int irq)
  25 {
  26         unsigned short nimr;
  27         unsigned short mask = 1 << (irq - HD64465_IRQ_BASE);
  28
  29         pr_debug("disable_hd64465_irq(%d): mask=%x\n", irq, mask);
  30         nimr = inw(HD64465_REG_NIMR);
  31         nimr |= mask;
  32         outw(nimr, HD64465_REG_NIMR);
  33 }
  34
  35 static void enable_hd64465_irq(unsigned int irq)
  36 {
  37         unsigned short nimr;
  38         unsigned short mask = 1 << (irq - HD64465_IRQ_BASE);
  39
  40         pr_debug("enable_hd64465_irq(%d): mask=%x\n", irq, mask);
  41         nimr = inw(HD64465_REG_NIMR);
  42         nimr &= ~mask;
  43         outw(nimr, HD64465_REG_NIMR);
  44 }
  45
  46 static void mask_and_ack_hd64465(unsigned int irq)
  47 {
  48         disable_hd64465_irq(irq);
  49 }
  50
  51 static void end_hd64465_irq(unsigned int irq)
  52 {
  53         if (!(irq_desc[irq].status & (IRQ_DISABLED|IRQ_INPROGRESS)))
  54                 enable_hd64465_irq(irq);
  55 }
  56
  57 static unsigned int startup_hd64465_irq(unsigned int irq)
  58 {
  59         enable_hd64465_irq(irq);
  60         return 0;
  61 }
  62
  63 static void shutdown_hd64465_irq(unsigned int irq)
  64 {
  65         disable_hd64465_irq(irq);
  66 }
  67
  68 static struct hw_interrupt_type hd64465_irq_type = {
  69         .typename       = "HD64465-IRQ",
  70         .startup        = startup_hd64465_irq,
  71         .shutdown       = shutdown_hd64465_irq,
  72         .enable         = enable_hd64465_irq,
  73         .disable        = disable_hd64465_irq,
  74         .ack            = mask_and_ack_hd64465,
  75         .end            = end_hd64465_irq,
  76 };
  77
  78 static irqreturn_t hd64465_interrupt(int irq, void *dev_id)
  79 {
  80         printk(KERN_INFO
  81                "HD64465: spurious interrupt, nirr: 0x%x nimr: 0x%x\n",
  82                inw(HD64465_REG_NIRR), inw(HD64465_REG_NIMR));
  83
  84         return IRQ_NONE;
  85 }
  86
  87 /*
  88  * Support for a secondary IRQ demux step.  This is necessary
  89  * because the HD64465 presents a very thin interface to the
  90  * PCMCIA bus; a lot of features (such as remapping interrupts)
  91  * normally done in hardware by other PCMCIA host bridges is
  92  * instead done in software.
  93  */
  94 static struct {
  95     int (*func)(int, void *);
  96     void *dev;
  97 } hd64465_demux[HD64465_IRQ_NUM];
  98
  99 void hd64465_register_irq_demux(int irq,
 100                 int (*demux)(int irq, void *dev), void *dev)
 101 {
 102         hd64465_demux[irq - HD64465_IRQ_BASE].func = demux;
 103         hd64465_demux[irq - HD64465_IRQ_BASE].dev = dev;
 104 }
 105 EXPORT_SYMBOL(hd64465_register_irq_demux);
 106
 107 void hd64465_unregister_irq_demux(int irq)
 108 {
 109         hd64465_demux[irq - HD64465_IRQ_BASE].func = 0;
 110 }
 111 EXPORT_SYMBOL(hd64465_unregister_irq_demux);
 112
 113 int hd64465_irq_demux(int irq)
 114 {
 115         if (irq == CONFIG_HD64465_IRQ) {
 116                 unsigned short i, bit;
 117                 unsigned short nirr = inw(HD64465_REG_NIRR);
 118                 unsigned short nimr = inw(HD64465_REG_NIMR);
 119
 120                 pr_debug("hd64465_irq_demux, nirr=%04x, nimr=%04x\n", nirr, nimr);
 121                 nirr &= ~nimr;
 122                 for (bit = 1, i = 0 ; i < HD64465_IRQ_NUM ; bit <<= 1, i++)
 123                     if (nirr & bit)
 124                         break;
 125
 126                 if (i < HD64465_IRQ_NUM) {
 127                     irq = HD64465_IRQ_BASE + i;
 128                     if (hd64465_demux[i].func != 0)
 129                         irq = hd64465_demux[i].func(irq, hd64465_demux[i].dev);
 130                 }
 131         }
 132         return irq;
 133 }
 134
 135 static struct irqaction irq0  = {
 136         .handler = hd64465_interrupt,
 137         .flags = IRQF_DISABLED,
 138         .mask = CPU_MASK_NONE,
 139         .name = "HD64465",
 140 };
 141
 142 static int __init setup_hd64465(void)
 143 {
 144         int i;
 145         unsigned short rev;
 146         unsigned short smscr;
 147
 148         if (!MACH_HD64465)
 149                 return 0;
 150
 151         printk(KERN_INFO "HD64465 configured at 0x%x on irq %d(mapped into %d to %d)\n",
 152                CONFIG_HD64465_IOBASE,
 153                CONFIG_HD64465_IRQ,
 154                HD64465_IRQ_BASE,
 155                HD64465_IRQ_BASE+HD64465_IRQ_NUM-1);
 156
 157         if (inw(HD64465_REG_SDID) != HD64465_SDID) {
 158                 printk(KERN_ERR "HD64465 device ID not found, check base address\n");
 159         }
 160
 161         rev = inw(HD64465_REG_SRR);
 162         printk(KERN_INFO "HD64465 hardware revision %d.%d\n", (rev >> 8) & 0xff, rev & 0xff);
 163
 164         outw(0xffff, HD64465_REG_NIMR); /* mask all interrupts */
 165
 166         for (i = 0; i < HD64465_IRQ_NUM ; i++) {
 167                 irq_desc[HD64465_IRQ_BASE + i].chip = &hd64465_irq_type;
 168         }
 169
 170         setup_irq(CONFIG_HD64465_IRQ, &irq0);
 171
 172         /* wake up the UART from STANDBY at this point */
 173         smscr = inw(HD64465_REG_SMSCR);
 174         outw(smscr & (~HD64465_SMSCR_UARTST), HD64465_REG_SMSCR);
 175
 176         /* remap IO ports for first ISA serial port to HD64465 UART */
 177         hd64465_port_map(0x3f8, 8, CONFIG_HD64465_IOBASE + 0x8000, 1);
 178
 179         return 0;
 180 }
 181 module_init(setup_hd64465);