2019-01-15 04:18:56 +00:00
|
|
|
// SPDX-License-Identifier: GPL-2.0+
|
|
|
|
/*
|
|
|
|
* CMOS/NV-RAM driver for Atari. Adapted from drivers/char/nvram.c.
|
|
|
|
* Copyright (C) 1997 Roman Hodek <Roman.Hodek@informatik.uni-erlangen.de>
|
|
|
|
* idea by and with help from Richard Jelinek <rj@suse.de>
|
|
|
|
* Portions copyright (c) 2001,2002 Sun Microsystems (thockin@sun.com)
|
|
|
|
* Further contributions from Cesar Barros, Erik Gilling, Tim Hockin and
|
|
|
|
* Wim Van Sebroeck.
|
|
|
|
*/
|
|
|
|
|
|
|
|
#include <linux/errno.h>
|
|
|
|
#include <linux/init.h>
|
|
|
|
#include <linux/mc146818rtc.h>
|
|
|
|
#include <linux/module.h>
|
|
|
|
#include <linux/nvram.h>
|
|
|
|
#include <linux/proc_fs.h>
|
|
|
|
#include <linux/seq_file.h>
|
|
|
|
#include <linux/spinlock.h>
|
|
|
|
#include <linux/types.h>
|
|
|
|
#include <asm/atarihw.h>
|
|
|
|
#include <asm/atariints.h>
|
|
|
|
|
|
|
|
#define NVRAM_BYTES 50
|
|
|
|
|
|
|
|
/* It is worth noting that these functions all access bytes of general
|
|
|
|
* purpose memory in the NVRAM - that is to say, they all add the
|
|
|
|
* NVRAM_FIRST_BYTE offset. Pass them offsets into NVRAM as if you did not
|
|
|
|
* know about the RTC cruft.
|
|
|
|
*/
|
|
|
|
|
|
|
|
/* Note that *all* calls to CMOS_READ and CMOS_WRITE must be done with
|
|
|
|
* rtc_lock held. Due to the index-port/data-port design of the RTC, we
|
|
|
|
* don't want two different things trying to get to it at once. (e.g. the
|
|
|
|
* periodic 11 min sync from kernel/time/ntp.c vs. this driver.)
|
|
|
|
*/
|
|
|
|
|
2019-01-15 04:18:56 +00:00
|
|
|
static unsigned char __nvram_read_byte(int i)
|
2019-01-15 04:18:56 +00:00
|
|
|
{
|
|
|
|
return CMOS_READ(NVRAM_FIRST_BYTE + i);
|
|
|
|
}
|
|
|
|
|
|
|
|
/* This races nicely with trying to read with checksum checking */
|
2019-01-15 04:18:56 +00:00
|
|
|
static void __nvram_write_byte(unsigned char c, int i)
|
2019-01-15 04:18:56 +00:00
|
|
|
{
|
|
|
|
CMOS_WRITE(c, NVRAM_FIRST_BYTE + i);
|
|
|
|
}
|
|
|
|
|
|
|
|
/* On Ataris, the checksum is over all bytes except the checksum bytes
|
|
|
|
* themselves; these are at the very end.
|
|
|
|
*/
|
|
|
|
#define ATARI_CKS_RANGE_START 0
|
|
|
|
#define ATARI_CKS_RANGE_END 47
|
|
|
|
#define ATARI_CKS_LOC 48
|
|
|
|
|
2019-01-15 04:18:56 +00:00
|
|
|
static int __nvram_check_checksum(void)
|
2019-01-15 04:18:56 +00:00
|
|
|
{
|
|
|
|
int i;
|
|
|
|
unsigned char sum = 0;
|
|
|
|
|
|
|
|
for (i = ATARI_CKS_RANGE_START; i <= ATARI_CKS_RANGE_END; ++i)
|
|
|
|
sum += __nvram_read_byte(i);
|
|
|
|
return (__nvram_read_byte(ATARI_CKS_LOC) == (~sum & 0xff)) &&
|
|
|
|
(__nvram_read_byte(ATARI_CKS_LOC + 1) == (sum & 0xff));
|
|
|
|
}
|
|
|
|
|
|
|
|
static void __nvram_set_checksum(void)
|
|
|
|
{
|
|
|
|
int i;
|
|
|
|
unsigned char sum = 0;
|
|
|
|
|
|
|
|
for (i = ATARI_CKS_RANGE_START; i <= ATARI_CKS_RANGE_END; ++i)
|
|
|
|
sum += __nvram_read_byte(i);
|
|
|
|
__nvram_write_byte(~sum, ATARI_CKS_LOC);
|
|
|
|
__nvram_write_byte(sum, ATARI_CKS_LOC + 1);
|
|
|
|
}
|
|
|
|
|
2019-01-15 04:18:56 +00:00
|
|
|
long atari_nvram_set_checksum(void)
|
2019-01-15 04:18:56 +00:00
|
|
|
{
|
|
|
|
spin_lock_irq(&rtc_lock);
|
|
|
|
__nvram_set_checksum();
|
|
|
|
spin_unlock_irq(&rtc_lock);
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
2019-01-15 04:18:56 +00:00
|
|
|
long atari_nvram_initialize(void)
|
2019-01-15 04:18:56 +00:00
|
|
|
{
|
|
|
|
loff_t i;
|
|
|
|
|
|
|
|
spin_lock_irq(&rtc_lock);
|
|
|
|
for (i = 0; i < NVRAM_BYTES; ++i)
|
|
|
|
__nvram_write_byte(0, i);
|
|
|
|
__nvram_set_checksum();
|
|
|
|
spin_unlock_irq(&rtc_lock);
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
2019-01-15 04:18:56 +00:00
|
|
|
ssize_t atari_nvram_read(char *buf, size_t count, loff_t *ppos)
|
2019-01-15 04:18:56 +00:00
|
|
|
{
|
|
|
|
char *p = buf;
|
|
|
|
loff_t i;
|
|
|
|
|
|
|
|
spin_lock_irq(&rtc_lock);
|
|
|
|
if (!__nvram_check_checksum()) {
|
|
|
|
spin_unlock_irq(&rtc_lock);
|
|
|
|
return -EIO;
|
|
|
|
}
|
|
|
|
for (i = *ppos; count > 0 && i < NVRAM_BYTES; --count, ++i, ++p)
|
|
|
|
*p = __nvram_read_byte(i);
|
|
|
|
spin_unlock_irq(&rtc_lock);
|
|
|
|
|
|
|
|
*ppos = i;
|
|
|
|
return p - buf;
|
|
|
|
}
|
|
|
|
|
2019-01-15 04:18:56 +00:00
|
|
|
ssize_t atari_nvram_write(char *buf, size_t count, loff_t *ppos)
|
2019-01-15 04:18:56 +00:00
|
|
|
{
|
|
|
|
char *p = buf;
|
|
|
|
loff_t i;
|
|
|
|
|
|
|
|
spin_lock_irq(&rtc_lock);
|
|
|
|
if (!__nvram_check_checksum()) {
|
|
|
|
spin_unlock_irq(&rtc_lock);
|
|
|
|
return -EIO;
|
|
|
|
}
|
|
|
|
for (i = *ppos; count > 0 && i < NVRAM_BYTES; --count, ++i, ++p)
|
|
|
|
__nvram_write_byte(*p, i);
|
|
|
|
__nvram_set_checksum();
|
|
|
|
spin_unlock_irq(&rtc_lock);
|
|
|
|
|
|
|
|
*ppos = i;
|
|
|
|
return p - buf;
|
|
|
|
}
|
|
|
|
|
2019-01-15 04:18:56 +00:00
|
|
|
ssize_t atari_nvram_get_size(void)
|
2019-01-15 04:18:56 +00:00
|
|
|
{
|
|
|
|
return NVRAM_BYTES;
|
|
|
|
}
|
|
|
|
|
2019-01-15 04:18:56 +00:00
|
|
|
#ifdef CONFIG_PROC_FS
|
|
|
|
static struct {
|
|
|
|
unsigned char val;
|
|
|
|
const char *name;
|
|
|
|
} boot_prefs[] = {
|
|
|
|
{ 0x80, "TOS" },
|
|
|
|
{ 0x40, "ASV" },
|
|
|
|
{ 0x20, "NetBSD (?)" },
|
|
|
|
{ 0x10, "Linux" },
|
|
|
|
{ 0x00, "unspecified" },
|
|
|
|
};
|
|
|
|
|
|
|
|
static const char * const languages[] = {
|
|
|
|
"English (US)",
|
|
|
|
"German",
|
|
|
|
"French",
|
|
|
|
"English (UK)",
|
|
|
|
"Spanish",
|
|
|
|
"Italian",
|
|
|
|
"6 (undefined)",
|
|
|
|
"Swiss (French)",
|
|
|
|
"Swiss (German)",
|
|
|
|
};
|
|
|
|
|
|
|
|
static const char * const dateformat[] = {
|
|
|
|
"MM%cDD%cYY",
|
|
|
|
"DD%cMM%cYY",
|
|
|
|
"YY%cMM%cDD",
|
|
|
|
"YY%cDD%cMM",
|
|
|
|
"4 (undefined)",
|
|
|
|
"5 (undefined)",
|
|
|
|
"6 (undefined)",
|
|
|
|
"7 (undefined)",
|
|
|
|
};
|
|
|
|
|
|
|
|
static const char * const colors[] = {
|
|
|
|
"2", "4", "16", "256", "65536", "??", "??", "??"
|
|
|
|
};
|
|
|
|
|
|
|
|
static void atari_nvram_proc_read(unsigned char *nvram, struct seq_file *seq,
|
|
|
|
void *offset)
|
|
|
|
{
|
|
|
|
int checksum;
|
|
|
|
int i;
|
|
|
|
unsigned int vmode;
|
|
|
|
|
|
|
|
spin_lock_irq(&rtc_lock);
|
|
|
|
checksum = __nvram_check_checksum();
|
|
|
|
spin_unlock_irq(&rtc_lock);
|
|
|
|
|
|
|
|
seq_printf(seq, "Checksum status : %svalid\n", checksum ? "" : "not ");
|
|
|
|
|
|
|
|
seq_puts(seq, "Boot preference : ");
|
|
|
|
for (i = ARRAY_SIZE(boot_prefs) - 1; i >= 0; --i)
|
|
|
|
if (nvram[1] == boot_prefs[i].val) {
|
|
|
|
seq_printf(seq, "%s\n", boot_prefs[i].name);
|
|
|
|
break;
|
|
|
|
}
|
|
|
|
if (i < 0)
|
|
|
|
seq_printf(seq, "0x%02x (undefined)\n", nvram[1]);
|
|
|
|
|
|
|
|
seq_printf(seq, "SCSI arbitration : %s\n",
|
|
|
|
(nvram[16] & 0x80) ? "on" : "off");
|
|
|
|
seq_puts(seq, "SCSI host ID : ");
|
|
|
|
if (nvram[16] & 0x80)
|
|
|
|
seq_printf(seq, "%d\n", nvram[16] & 7);
|
|
|
|
else
|
|
|
|
seq_puts(seq, "n/a\n");
|
|
|
|
|
|
|
|
if (!MACH_IS_FALCON)
|
|
|
|
return;
|
|
|
|
|
|
|
|
seq_puts(seq, "OS language : ");
|
|
|
|
if (nvram[6] < ARRAY_SIZE(languages))
|
|
|
|
seq_printf(seq, "%s\n", languages[nvram[6]]);
|
|
|
|
else
|
|
|
|
seq_printf(seq, "%u (undefined)\n", nvram[6]);
|
|
|
|
seq_puts(seq, "Keyboard language: ");
|
|
|
|
if (nvram[7] < ARRAY_SIZE(languages))
|
|
|
|
seq_printf(seq, "%s\n", languages[nvram[7]]);
|
|
|
|
else
|
|
|
|
seq_printf(seq, "%u (undefined)\n", nvram[7]);
|
|
|
|
seq_puts(seq, "Date format : ");
|
|
|
|
seq_printf(seq, dateformat[nvram[8] & 7],
|
|
|
|
nvram[9] ? nvram[9] : '/', nvram[9] ? nvram[9] : '/');
|
|
|
|
seq_printf(seq, ", %dh clock\n", nvram[8] & 16 ? 24 : 12);
|
|
|
|
seq_puts(seq, "Boot delay : ");
|
|
|
|
if (nvram[10] == 0)
|
|
|
|
seq_puts(seq, "default\n");
|
|
|
|
else
|
|
|
|
seq_printf(seq, "%ds%s\n", nvram[10],
|
|
|
|
nvram[10] < 8 ? ", no memory test" : "");
|
|
|
|
|
|
|
|
vmode = (nvram[14] << 8) | nvram[15];
|
|
|
|
seq_printf(seq,
|
|
|
|
"Video mode : %s colors, %d columns, %s %s monitor\n",
|
|
|
|
colors[vmode & 7], vmode & 8 ? 80 : 40,
|
|
|
|
vmode & 16 ? "VGA" : "TV", vmode & 32 ? "PAL" : "NTSC");
|
|
|
|
seq_printf(seq,
|
|
|
|
" %soverscan, compat. mode %s%s\n",
|
|
|
|
vmode & 64 ? "" : "no ", vmode & 128 ? "on" : "off",
|
|
|
|
vmode & 256 ?
|
|
|
|
(vmode & 16 ? ", line doubling" : ", half screen") : "");
|
|
|
|
}
|
|
|
|
|
|
|
|
static int nvram_proc_read(struct seq_file *seq, void *offset)
|
|
|
|
{
|
|
|
|
unsigned char contents[NVRAM_BYTES];
|
|
|
|
int i;
|
|
|
|
|
|
|
|
spin_lock_irq(&rtc_lock);
|
|
|
|
for (i = 0; i < NVRAM_BYTES; ++i)
|
|
|
|
contents[i] = __nvram_read_byte(i);
|
|
|
|
spin_unlock_irq(&rtc_lock);
|
|
|
|
|
|
|
|
atari_nvram_proc_read(contents, seq, offset);
|
|
|
|
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
|
|
|
static int __init atari_nvram_init(void)
|
|
|
|
{
|
|
|
|
if (!(MACH_IS_ATARI && ATARIHW_PRESENT(TT_CLK)))
|
|
|
|
return -ENODEV;
|
|
|
|
|
|
|
|
if (!proc_create_single("driver/nvram", 0, NULL, nvram_proc_read)) {
|
|
|
|
pr_err("nvram: can't create /proc/driver/nvram\n");
|
|
|
|
return -ENOMEM;
|
|
|
|
}
|
|
|
|
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
device_initcall(atari_nvram_init);
|
|
|
|
#endif /* CONFIG_PROC_FS */
|