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(void)
17 {
18 return base;
19 }
20
21 char *__init pc873xx_get_model(void)
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 }
90
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