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/*
* (C) Copyright 2002
* Wolfgang Denk, DENX Software Engineering, wd@denx.de.
*
* See file CREDITS for list of people who contributed to this
* project.
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License as
* published by the Free Software Foundation; either version 2 of
* the License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston,
* MA 02111-1307 USA
*/
#include <config.h>
#include <common.h>
#include <asm/io.h>
#include "pcippc2.h"
#include "i2c.h"
typedef struct cpc710_mem_org_s {
u8 rows;
u8 cols;
u8 banks2;
u8 org;
} cpc710_mem_org_t;
static int cpc710_compute_mcer (u32 * mcer,
unsigned long *size, unsigned int sdram);
static int cpc710_eeprom_checksum (unsigned int sdram);
static u8 cpc710_eeprom_read (unsigned int sdram, unsigned int offset);
static u32 cpc710_mcer_mem[] = {
0x000003f3, /* 18 lines, 4 Mb */
0x000003e3, /* 19 lines, 8 Mb */
0x000003c3, /* 20 lines, 16 Mb */
0x00000383, /* 21 lines, 32 Mb */
0x00000303, /* 22 lines, 64 Mb */
0x00000203, /* 23 lines, 128 Mb */
0x00000003, /* 24 lines, 256 Mb */
0x00000002, /* 25 lines, 512 Mb */
0x00000001 /* 26 lines, 1024 Mb */
};
static cpc710_mem_org_t cpc710_mem_org[] = {
{0x0c, 0x09, 0x02, 0x00}, /* 0000: 12/ 9/2 */
{0x0d, 0x09, 0x02, 0x00}, /* 0000: 13/ 9/2 */
{0x0d, 0x0a, 0x02, 0x00}, /* 0000: 13/10/2 */
{0x0d, 0x0b, 0x02, 0x00}, /* 0000: 13/11/2 */
{0x0d, 0x0c, 0x02, 0x00}, /* 0000: 13/12/2 */
{0x0e, 0x0c, 0x02, 0x00}, /* 0000: 14/12/2 */
{0x0b, 0x08, 0x02, 0x01}, /* 0001: 11/ 8/2 */
{0x0b, 0x09, 0x01, 0x02}, /* 0010: 11/ 9/1 */
{0x0b, 0x0a, 0x01, 0x03}, /* 0011: 11/10/1 */
{0x0c, 0x08, 0x02, 0x04}, /* 0100: 12/ 8/2 */
{0x0c, 0x0a, 0x02, 0x05}, /* 0101: 12/10/2 */
{0x0d, 0x08, 0x01, 0x06}, /* 0110: 13/ 8/1 */
{0x0d, 0x08, 0x02, 0x07}, /* 0111: 13/ 8/2 */
{0x0d, 0x09, 0x01, 0x08}, /* 1000: 13/ 9/1 */
{0x0d, 0x0a, 0x01, 0x09}, /* 1001: 13/10/1 */
{0x0b, 0x08, 0x01, 0x0a}, /* 1010: 11/ 8/1 */
{0x0c, 0x08, 0x01, 0x0b}, /* 1011: 12/ 8/1 */
{0x0c, 0x09, 0x01, 0x0c}, /* 1100: 12/ 9/1 */
{0x0e, 0x09, 0x02, 0x0d}, /* 1101: 14/ 9/2 */
{0x0e, 0x0a, 0x02, 0x0e}, /* 1110: 14/10/2 */
{0x0e, 0x0b, 0x02, 0x0f} /* 1111: 14/11/2 */
};
unsigned long cpc710_ram_init (void)
{
unsigned long memsize = 0;
unsigned long bank_size;
u32 mcer;
#ifndef CONFIG_SYS_RAMBOOT
/* Clear memory banks
*/
out32 (REG (SDRAM0, MCER0), 0);
out32 (REG (SDRAM0, MCER1), 0);
out32 (REG (SDRAM0, MCER2), 0);
out32 (REG (SDRAM0, MCER3), 0);
out32 (REG (SDRAM0, MCER4), 0);
out32 (REG (SDRAM0, MCER5), 0);
out32 (REG (SDRAM0, MCER6), 0);
out32 (REG (SDRAM0, MCER7), 0);
iobarrier_rw ();
/* Disable memory
*/
out32 (REG (SDRAM0, MCCR), 0x13b06000);
iobarrier_rw ();
#endif
/* Only the first memory bank is initialised now
*/
if (!cpc710_compute_mcer (&mcer, &bank_size, 0)) {
puts ("Unsupported SDRAM type !\n");
hang ();
}
memsize += bank_size;
#ifndef CONFIG_SYS_RAMBOOT
/* Enable bank, zero start
*/
out32 (REG (SDRAM0, MCER0), mcer | 0x80000000);
iobarrier_rw ();
#endif
#ifndef CONFIG_SYS_RAMBOOT
/* Enable memory
*/
out32 (REG (SDRAM0, MCCR), in32 (REG (SDRAM0, MCCR)) | 0x80000000);
/* Wait until initialisation finished
*/
while (!(in32 (REG (SDRAM0, MCCR)) & 0x20000000)) {
iobarrier_rw ();
}
/* Clear Memory Error Status and Address registers
*/
out32 (REG (SDRAM0, MESR), 0);
out32 (REG (SDRAM0, MEAR), 0);
iobarrier_rw ();
/* ECC is not configured now
*/
#endif
/* Memory size counter
*/
out32 (REG (CPC0, RGBAN1), memsize);
return memsize;
}
static int cpc710_compute_mcer (u32 * mcer, unsigned long *size, unsigned int sdram)
{
u8 rows;
u8 cols;
u8 banks2;
unsigned int lines;
u32 mc = 0;
unsigned int i;
cpc710_mem_org_t *org = 0;
if (!i2c_reset ()) {
puts ("Can't reset I2C!\n");
hang ();
}
if (!cpc710_eeprom_checksum (sdram)) {
puts ("Invalid EEPROM checksum !\n");
hang ();
}
rows = cpc710_eeprom_read (sdram, 3);
cols = cpc710_eeprom_read (sdram, 4);
/* Can be 2 or 4 banks; divide by 2
*/
banks2 = cpc710_eeprom_read (sdram, 17) / 2;
lines = rows + cols + banks2;
if (lines < 18 || lines > 26) {
/* Unsupported configuration
*/
return 0;
}
mc |= cpc710_mcer_mem[lines - 18] << 6;
for (i = 0; i < sizeof (cpc710_mem_org) / sizeof (cpc710_mem_org_t);
i++) {
cpc710_mem_org_t *corg = cpc710_mem_org + i;
if (corg->rows == rows && corg->cols == cols
&& corg->banks2 == banks2) {
org = corg;
break;
}
}
if (!org) {
/* Unsupported configuration
*/
return 0;
}
mc |= (u32) org->org << 2;
/* Supported configuration
*/
*mcer = mc;
*size = 1l << (lines + 4);
return 1;
}
static int cpc710_eeprom_checksum (unsigned int sdram)
{
u8 sum = 0;
unsigned int i;
for (i = 0; i < 63; i++) {
sum += cpc710_eeprom_read (sdram, i);
}
return sum == cpc710_eeprom_read (sdram, 63);
}
static u8 cpc710_eeprom_read (unsigned int sdram, unsigned int offset)
{
u8 dev = (sdram << 1) | 0xa0;
u8 data;
if (!i2c_read_byte (&data, dev, offset)) {
puts ("I2C error !\n");
hang ();
}
return data;
}
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