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Abstract CMOS accesses a bit more in preparation of using 

files for CMOS data.

Signed-off-by: Patrick Georgi <patrick.georgi@secunet.com>
Acked-by: Stefan Reinauer <stepan@coreboot.org>


git-svn-id: svn://svn.coreboot.org/coreboot/trunk@6283 2b7e53f0-3cfb-0310-b3e9-8179ed1497e1
This commit is contained in:
Patrick Georgi 2011-01-21 07:18:20 +00:00 committed by Patrick Georgi
parent 0d4f6536b0
commit be5a178de7
1 changed files with 63 additions and 28 deletions
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91
util/nvramtool/cmos_lowlevel.c
View File

@ -36,6 +36,67 @@
#include "common.h"
#include "cmos_lowlevel.h"
/* Hardware Abstraction Layer: lowlevel byte-wise write access */
typedef struct {
void (*init)(void* data);
unsigned char (*read)(unsigned addr);
void (*write)(unsigned addr, unsigned char value);
} cmos_access_t;
static void cmos_hal_init(void* data);
static unsigned char cmos_hal_read(unsigned addr);
static void cmos_hal_write(unsigned addr, unsigned char value);
static cmos_access_t cmos_hal = {
.init = cmos_hal_init,
.read = cmos_hal_read,
.write = cmos_hal_write
};
static cmos_access_t *current_access = &cmos_hal;
/* no need to initialize anything */
static void cmos_hal_init(__attribute__((unused)) void *data)
{
}
static unsigned char cmos_hal_read(unsigned index)
{
unsigned short port_0, port_1;
assert(!verify_cmos_byte_index(index));
if (index < 128) {
port_0 = 0x70;
port_1 = 0x71;
} else {
port_0 = 0x72;
port_1 = 0x73;
}
OUTB(index, port_0);
return INB(port_1);
}
static void cmos_hal_write(unsigned index, unsigned char value)
{
unsigned short port_0, port_1;
assert(!verify_cmos_byte_index(index));
if (index < 128) {
port_0 = 0x70;
port_1 = 0x71;
} else {
port_0 = 0x72;
port_1 = 0x73;
}
OUTB(index, port_0);
OUTB(value, port_1);
}
/* Bit-level access */
typedef struct {
unsigned byte_index;
unsigned bit_offset;
@ -181,20 +242,7 @@ void cmos_write(const cmos_entry_t * e, unsigned long long value)
****************************************************************************/
unsigned char cmos_read_byte(unsigned index)
{
unsigned short port_0, port_1;
assert(!verify_cmos_byte_index(index));
if (index < 128) {
port_0 = 0x70;
port_1 = 0x71;
} else {
port_0 = 0x72;
port_1 = 0x73;
}
OUTB(index, port_0);
return INB(port_1);
return current_access->read(index);
}
/****************************************************************************
@ -209,20 +257,7 @@ unsigned char cmos_read_byte(unsigned index)
****************************************************************************/
void cmos_write_byte(unsigned index, unsigned char value)
{
unsigned short port_0, port_1;
assert(!verify_cmos_byte_index(index));
if (index < 128) {
port_0 = 0x70;
port_1 = 0x71;
} else {
port_0 = 0x72;
port_1 = 0x73;
}
OUTB(index, port_0);
OUTB(value, port_1);
current_access->write(index, value);
}
/****************************************************************************