linux/arch/alpha/kernel/pc873xx.c
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   1// SPDX-License-Identifier: GPL-2.0
   2#include <linux/ioport.h>
   3#include <asm/io.h>
   4
   5#include "pc873xx.h"
   6
   7static unsigned pc873xx_probelist[] = {0x398, 0x26e, 0};
   8
   9static char *pc873xx_names[] = {
  10        "PC87303", "PC87306", "PC87312", "PC87332", "PC87334"
  11};
  12
  13static unsigned int base, model;
  14
  15
  16unsigned int __init pc873xx_get_base(void)
  17{
  18        return base;
  19}
  20
  21char *__init pc873xx_get_model(void)
  22{
  23        return pc873xx_names[model];
  24}
  25
  26static unsigned char __init pc873xx_read(unsigned int base, int reg)
  27{
  28        outb(reg, base);
  29        return inb(base + 1);
  30}
  31
  32static void __init pc873xx_write(unsigned int base, int reg, unsigned char data)
  33{
  34        unsigned long flags;
  35
  36        local_irq_save(flags);
  37        outb(reg, base);
  38        outb(data, base + 1);
  39        outb(data, base + 1);           /* Must be written twice */
  40        local_irq_restore(flags);
  41}
  42
  43int __init pc873xx_probe(void)
  44{
  45        int val, index = 0;
  46
  47        while ((base = pc873xx_probelist[index++])) {
  48
  49                if (request_region(base, 2, "Super IO PC873xx") == NULL)
  50                        continue;
  51
  52                val = pc873xx_read(base, REG_SID);
  53                if ((val & 0xf0) == 0x10) {
  54                        model = PC87332;
  55                        break;
  56                } else if ((val & 0xf8) == 0x70) {
  57                        model = PC87306;
  58                        break;
  59                } else if ((val & 0xf8) == 0x50) {
  60                        model = PC87334;
  61                        break;
  62                } else if ((val & 0xf8) == 0x40) {
  63                        model = PC87303;
  64                        break;
  65                }
  66
  67                release_region(base, 2);
  68        }
  69
  70        return (base == 0) ? -1 : 1;
  71}
  72
  73void __init pc873xx_enable_epp19(void)
  74{
  75        unsigned char data;
  76
  77        printk(KERN_INFO "PC873xx enabling EPP v1.9\n");
  78        data = pc873xx_read(base, REG_PCR);
  79        pc873xx_write(base, REG_PCR, (data & 0xFC) | 0x02);
  80}
  81
  82void __init pc873xx_enable_ide(void)
  83{
  84        unsigned char data;
  85
  86        printk(KERN_INFO "PC873xx enabling IDE interrupt\n");
  87        data = pc873xx_read(base, REG_FER);
  88        pc873xx_write(base, REG_FER, data | 0x40);
  89}
  90
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