arch/alpha/kernel/pc873xx.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 #include <linux/ioport.h>
   3 #include <asm/io.h>
   4
   5 #include "pc873xx.h"
   6
   7 static unsigned pc873xx_probelist[] = {0x398, 0x26e, 0};
   8
   9 static char *pc873xx_names[] = {
  10         "PC87303", "PC87306", "PC87312", "PC87332", "PC87334"
  11 };
  12
  13 static unsigned int base, model;
  14
  15
  16 unsigned int __init pc873xx_get_base()
  17 {
  18         return base;
  19 }
  20
  21 char *__init pc873xx_get_model()
  22 {
  23         return pc873xx_names[model];
  24 }
  25
  26 static unsigned char __init pc873xx_read(unsigned int base, int reg)
  27 {
  28         outb(reg, base);
  29         return inb(base + 1);
  30 }
  31
  32 static 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
  43 int __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
  73 void __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
  82 void __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 }