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u-boot/cpu/ppc4xx/44x_spd_ddr.c
Stefan Roese 36d830c983 [PATCH] PPC4xx: Split 4xx SPD SDRAM init routines into 2 files 
Since the existing 4xx SPD SDRAM initialization routines for the
405 SDRAM controller and the 440 DDR controller don't have much in
common this patch splits both drivers into different files.

This is in preparation for the 440 DDR2 controller support (440SP/e).

Signed-off-by: Stefan Roese <sr@denx.de>
2007-02-20 10:35:42 +01:00

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/*
* cpu/ppc4xx/44x_spd_ddr.c
* This SPD DDR detection code supports IBM/AMCC PPC44x cpu with a
* DDR controller. Those are 440GP/GX/EP/GR.
*
* (C) Copyright 2001
* Bill Hunter, Wave 7 Optics, williamhunter@attbi.com
*
* Based on code by:
*
* Kenneth Johansson ,Ericsson AB.
* kenneth.johansson@etx.ericsson.se
*
* hacked up by bill hunter. fixed so we could run before
* serial_init and console_init. previous version avoided this by
* running out of cache memory during serial/console init, then running
* this code later.
*
* (C) Copyright 2002
* Jun Gu, Artesyn Technology, jung@artesyncp.com
* Support for AMCC 440 based on OpenBIOS draminit.c from IBM.
*
* (C) Copyright 2005
* Stefan Roese, DENX Software Engineering, sr@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 <common.h>
#include <asm/processor.h>
#include <i2c.h>
#include <ppc4xx.h>
#if defined(CONFIG_SPD_EEPROM) && \
(defined(CONFIG_440GP) || defined(CONFIG_440GX) || \
defined(CONFIG_440EP) || defined(CONFIG_440GR))
/*
* Set default values
*/
#ifndef CFG_I2C_SPEED
#define CFG_I2C_SPEED 50000
#endif
#ifndef CFG_I2C_SLAVE
#define CFG_I2C_SLAVE 0xFE
#endif
#define ONE_BILLION 1000000000
/*-----------------------------------------------------------------------------
| Memory Controller Options 0
+-----------------------------------------------------------------------------*/
#define SDRAM_CFG0_DCEN 0x80000000 /* SDRAM Controller Enable */
#define SDRAM_CFG0_MCHK_MASK 0x30000000 /* Memory data errchecking mask */
#define SDRAM_CFG0_MCHK_NON 0x00000000 /* No ECC generation */
#define SDRAM_CFG0_MCHK_GEN 0x20000000 /* ECC generation */
#define SDRAM_CFG0_MCHK_CHK 0x30000000 /* ECC generation and checking */
#define SDRAM_CFG0_RDEN 0x08000000 /* Registered DIMM enable */
#define SDRAM_CFG0_PMUD 0x04000000 /* Page management unit */
#define SDRAM_CFG0_DMWD_MASK 0x02000000 /* DRAM width mask */
#define SDRAM_CFG0_DMWD_32 0x00000000 /* 32 bits */
#define SDRAM_CFG0_DMWD_64 0x02000000 /* 64 bits */
#define SDRAM_CFG0_UIOS_MASK 0x00C00000 /* Unused IO State */
#define SDRAM_CFG0_PDP 0x00200000 /* Page deallocation policy */
/*-----------------------------------------------------------------------------
| Memory Controller Options 1
+-----------------------------------------------------------------------------*/
#define SDRAM_CFG1_SRE 0x80000000 /* Self-Refresh Entry */
#define SDRAM_CFG1_PMEN 0x40000000 /* Power Management Enable */
/*-----------------------------------------------------------------------------+
| SDRAM DEVPOT Options
+-----------------------------------------------------------------------------*/
#define SDRAM_DEVOPT_DLL 0x80000000
#define SDRAM_DEVOPT_DS 0x40000000
/*-----------------------------------------------------------------------------+
| SDRAM MCSTS Options
+-----------------------------------------------------------------------------*/
#define SDRAM_MCSTS_MRSC 0x80000000
#define SDRAM_MCSTS_SRMS 0x40000000
#define SDRAM_MCSTS_CIS 0x20000000
/*-----------------------------------------------------------------------------
| SDRAM Refresh Timer Register
+-----------------------------------------------------------------------------*/
#define SDRAM_RTR_RINT_MASK 0xFFFF0000
#define SDRAM_RTR_RINT_ENCODE(n) (((n) << 16) & SDRAM_RTR_RINT_MASK)
#define sdram_HZ_to_ns(hertz) (1000000000/(hertz))
/*-----------------------------------------------------------------------------+
| SDRAM UABus Base Address Reg
+-----------------------------------------------------------------------------*/
#define SDRAM_UABBA_UBBA_MASK 0x0000000F
/*-----------------------------------------------------------------------------+
| Memory Bank 0-7 configuration
+-----------------------------------------------------------------------------*/
#define SDRAM_BXCR_SDBA_MASK 0xff800000 /* Base address */
#define SDRAM_BXCR_SDSZ_MASK 0x000e0000 /* Size */
#define SDRAM_BXCR_SDSZ_8 0x00020000 /* 8M */
#define SDRAM_BXCR_SDSZ_16 0x00040000 /* 16M */
#define SDRAM_BXCR_SDSZ_32 0x00060000 /* 32M */
#define SDRAM_BXCR_SDSZ_64 0x00080000 /* 64M */
#define SDRAM_BXCR_SDSZ_128 0x000a0000 /* 128M */
#define SDRAM_BXCR_SDSZ_256 0x000c0000 /* 256M */
#define SDRAM_BXCR_SDSZ_512 0x000e0000 /* 512M */
#define SDRAM_BXCR_SDAM_MASK 0x0000e000 /* Addressing mode */
#define SDRAM_BXCR_SDAM_1 0x00000000 /* Mode 1 */
#define SDRAM_BXCR_SDAM_2 0x00002000 /* Mode 2 */
#define SDRAM_BXCR_SDAM_3 0x00004000 /* Mode 3 */
#define SDRAM_BXCR_SDAM_4 0x00006000 /* Mode 4 */
#define SDRAM_BXCR_SDBE 0x00000001 /* Memory Bank Enable */
/*-----------------------------------------------------------------------------+
| SDRAM TR0 Options
+-----------------------------------------------------------------------------*/
#define SDRAM_TR0_SDWR_MASK 0x80000000
#define SDRAM_TR0_SDWR_2_CLK 0x00000000
#define SDRAM_TR0_SDWR_3_CLK 0x80000000
#define SDRAM_TR0_SDWD_MASK 0x40000000
#define SDRAM_TR0_SDWD_0_CLK 0x00000000
#define SDRAM_TR0_SDWD_1_CLK 0x40000000
#define SDRAM_TR0_SDCL_MASK 0x01800000
#define SDRAM_TR0_SDCL_2_0_CLK 0x00800000
#define SDRAM_TR0_SDCL_2_5_CLK 0x01000000
#define SDRAM_TR0_SDCL_3_0_CLK 0x01800000
#define SDRAM_TR0_SDPA_MASK 0x000C0000
#define SDRAM_TR0_SDPA_2_CLK 0x00040000
#define SDRAM_TR0_SDPA_3_CLK 0x00080000
#define SDRAM_TR0_SDPA_4_CLK 0x000C0000
#define SDRAM_TR0_SDCP_MASK 0x00030000
#define SDRAM_TR0_SDCP_2_CLK 0x00000000
#define SDRAM_TR0_SDCP_3_CLK 0x00010000
#define SDRAM_TR0_SDCP_4_CLK 0x00020000
#define SDRAM_TR0_SDCP_5_CLK 0x00030000
#define SDRAM_TR0_SDLD_MASK 0x0000C000
#define SDRAM_TR0_SDLD_1_CLK 0x00000000
#define SDRAM_TR0_SDLD_2_CLK 0x00004000
#define SDRAM_TR0_SDRA_MASK 0x0000001C
#define SDRAM_TR0_SDRA_6_CLK 0x00000000
#define SDRAM_TR0_SDRA_7_CLK 0x00000004
#define SDRAM_TR0_SDRA_8_CLK 0x00000008
#define SDRAM_TR0_SDRA_9_CLK 0x0000000C
#define SDRAM_TR0_SDRA_10_CLK 0x00000010
#define SDRAM_TR0_SDRA_11_CLK 0x00000014
#define SDRAM_TR0_SDRA_12_CLK 0x00000018
#define SDRAM_TR0_SDRA_13_CLK 0x0000001C
#define SDRAM_TR0_SDRD_MASK 0x00000003
#define SDRAM_TR0_SDRD_2_CLK 0x00000001
#define SDRAM_TR0_SDRD_3_CLK 0x00000002
#define SDRAM_TR0_SDRD_4_CLK 0x00000003
/*-----------------------------------------------------------------------------+
| SDRAM TR1 Options
+-----------------------------------------------------------------------------*/
#define SDRAM_TR1_RDSS_MASK 0xC0000000
#define SDRAM_TR1_RDSS_TR0 0x00000000
#define SDRAM_TR1_RDSS_TR1 0x40000000
#define SDRAM_TR1_RDSS_TR2 0x80000000
#define SDRAM_TR1_RDSS_TR3 0xC0000000
#define SDRAM_TR1_RDSL_MASK 0x00C00000
#define SDRAM_TR1_RDSL_STAGE1 0x00000000
#define SDRAM_TR1_RDSL_STAGE2 0x00400000
#define SDRAM_TR1_RDSL_STAGE3 0x00800000
#define SDRAM_TR1_RDCD_MASK 0x00000800
#define SDRAM_TR1_RDCD_RCD_0_0 0x00000000
#define SDRAM_TR1_RDCD_RCD_1_2 0x00000800
#define SDRAM_TR1_RDCT_MASK 0x000001FF
#define SDRAM_TR1_RDCT_ENCODE(x) (((x) << 0) & SDRAM_TR1_RDCT_MASK)
#define SDRAM_TR1_RDCT_DECODE(x) (((x) & SDRAM_TR1_RDCT_MASK) >> 0)
#define SDRAM_TR1_RDCT_MIN 0x00000000
#define SDRAM_TR1_RDCT_MAX 0x000001FF
/*-----------------------------------------------------------------------------+
| SDRAM WDDCTR Options
+-----------------------------------------------------------------------------*/
#define SDRAM_WDDCTR_WRCP_MASK 0xC0000000
#define SDRAM_WDDCTR_WRCP_0DEG 0x00000000
#define SDRAM_WDDCTR_WRCP_90DEG 0x40000000
#define SDRAM_WDDCTR_WRCP_180DEG 0x80000000
#define SDRAM_WDDCTR_DCD_MASK 0x000001FF
/*-----------------------------------------------------------------------------+
| SDRAM CLKTR Options
+-----------------------------------------------------------------------------*/
#define SDRAM_CLKTR_CLKP_MASK 0xC0000000
#define SDRAM_CLKTR_CLKP_0DEG 0x00000000
#define SDRAM_CLKTR_CLKP_90DEG 0x40000000
#define SDRAM_CLKTR_CLKP_180DEG 0x80000000
#define SDRAM_CLKTR_DCDT_MASK 0x000001FF
/*-----------------------------------------------------------------------------+
| SDRAM DLYCAL Options
+-----------------------------------------------------------------------------*/
#define SDRAM_DLYCAL_DLCV_MASK 0x000003FC
#define SDRAM_DLYCAL_DLCV_ENCODE(x) (((x)<<2) & SDRAM_DLYCAL_DLCV_MASK)
#define SDRAM_DLYCAL_DLCV_DECODE(x) (((x) & SDRAM_DLYCAL_DLCV_MASK)>>2)
/*-----------------------------------------------------------------------------+
| General Definition
+-----------------------------------------------------------------------------*/
#define DEFAULT_SPD_ADDR1 0x53
#define DEFAULT_SPD_ADDR2 0x52
#define MAXBANKS 4 /* at most 4 dimm banks */
#define MAX_SPD_BYTES 256
#define NUMHALFCYCLES 4
#define NUMMEMTESTS 8
#define NUMMEMWORDS 8
#define MAXBXCR 4
#define TRUE 1
#define FALSE 0
const unsigned long test[NUMMEMTESTS][NUMMEMWORDS] = {
{0x00000000, 0x00000000, 0xFFFFFFFF, 0xFFFFFFFF, 0x00000000, 0x00000000,
0xFFFFFFFF, 0xFFFFFFFF},
{0xFFFFFFFF, 0xFFFFFFFF, 0x00000000, 0x00000000, 0xFFFFFFFF, 0xFFFFFFFF,
0x00000000, 0x00000000},
{0xAAAAAAAA, 0xAAAAAAAA, 0x55555555, 0x55555555, 0xAAAAAAAA, 0xAAAAAAAA,
0x55555555, 0x55555555},
{0x55555555, 0x55555555, 0xAAAAAAAA, 0xAAAAAAAA, 0x55555555, 0x55555555,
0xAAAAAAAA, 0xAAAAAAAA},
{0xA5A5A5A5, 0xA5A5A5A5, 0x5A5A5A5A, 0x5A5A5A5A, 0xA5A5A5A5, 0xA5A5A5A5,
0x5A5A5A5A, 0x5A5A5A5A},
{0x5A5A5A5A, 0x5A5A5A5A, 0xA5A5A5A5, 0xA5A5A5A5, 0x5A5A5A5A, 0x5A5A5A5A,
0xA5A5A5A5, 0xA5A5A5A5},
{0xAA55AA55, 0xAA55AA55, 0x55AA55AA, 0x55AA55AA, 0xAA55AA55, 0xAA55AA55,
0x55AA55AA, 0x55AA55AA},
{0x55AA55AA, 0x55AA55AA, 0xAA55AA55, 0xAA55AA55, 0x55AA55AA, 0x55AA55AA,
0xAA55AA55, 0xAA55AA55}
};
/* bank_parms is used to sort the bank sizes by descending order */
struct bank_param {
unsigned long cr;
unsigned long bank_size_bytes;
};
typedef struct bank_param BANKPARMS;
#ifdef CFG_SIMULATE_SPD_EEPROM
extern unsigned char cfg_simulate_spd_eeprom[128];
#endif
unsigned char spd_read(uchar chip, uint addr);
void get_spd_info(unsigned long* dimm_populated,
unsigned char* iic0_dimm_addr,
unsigned long num_dimm_banks);
void check_mem_type
(unsigned long* dimm_populated,
unsigned char* iic0_dimm_addr,
unsigned long num_dimm_banks);
void check_volt_type
(unsigned long* dimm_populated,
unsigned char* iic0_dimm_addr,
unsigned long num_dimm_banks);
void program_cfg0(unsigned long* dimm_populated,
unsigned char* iic0_dimm_addr,
unsigned long num_dimm_banks);
void program_cfg1(unsigned long* dimm_populated,
unsigned char* iic0_dimm_addr,
unsigned long num_dimm_banks);
void program_rtr (unsigned long* dimm_populated,
unsigned char* iic0_dimm_addr,
unsigned long num_dimm_banks);
void program_tr0 (unsigned long* dimm_populated,
unsigned char* iic0_dimm_addr,
unsigned long num_dimm_banks);
void program_tr1 (void);
void program_ecc (unsigned long num_bytes);
unsigned
long program_bxcr(unsigned long* dimm_populated,
unsigned char* iic0_dimm_addr,
unsigned long num_dimm_banks);
/*
* This function is reading data from the DIMM module EEPROM over the SPD bus
* and uses that to program the sdram controller.
*
* This works on boards that has the same schematics that the AMCC walnut has.
*
* BUG: Don't handle ECC memory
* BUG: A few values in the TR register is currently hardcoded
*/
long int spd_sdram(void) {
unsigned char iic0_dimm_addr[] = SPD_EEPROM_ADDRESS;
unsigned long dimm_populated[sizeof(iic0_dimm_addr)];
unsigned long total_size;
unsigned long cfg0;
unsigned long mcsts;
unsigned long num_dimm_banks; /* on board dimm banks */
num_dimm_banks = sizeof(iic0_dimm_addr);
/*
* Make sure I2C controller is initialized
* before continuing.
*/
i2c_init(CFG_I2C_SPEED, CFG_I2C_SLAVE);
/*
* Read the SPD information using I2C interface. Check to see if the
* DIMM slots are populated.
*/
get_spd_info(dimm_populated, iic0_dimm_addr, num_dimm_banks);
/*
* Check the memory type for the dimms plugged.
*/
check_mem_type(dimm_populated, iic0_dimm_addr, num_dimm_banks);
/*
* Check the voltage type for the dimms plugged.
*/
check_volt_type(dimm_populated, iic0_dimm_addr, num_dimm_banks);
#if defined(CONFIG_440GX) || defined(CONFIG_440EP) || defined(CONFIG_440GR) || defined(CONFIG_440SP)
/*
* Soft-reset SDRAM controller.
*/
mtsdr(sdr_srst, SDR0_SRST_DMC);
mtsdr(sdr_srst, 0x00000000);
#endif
/*
* program 440GP SDRAM controller options (SDRAM0_CFG0)
*/
program_cfg0(dimm_populated, iic0_dimm_addr, num_dimm_banks);
/*
* program 440GP SDRAM controller options (SDRAM0_CFG1)
*/
program_cfg1(dimm_populated, iic0_dimm_addr, num_dimm_banks);
/*
* program SDRAM refresh register (SDRAM0_RTR)
*/
program_rtr(dimm_populated, iic0_dimm_addr, num_dimm_banks);
/*
* program SDRAM Timing Register 0 (SDRAM0_TR0)
*/
program_tr0(dimm_populated, iic0_dimm_addr, num_dimm_banks);
/*
* program the BxCR registers to find out total sdram installed
*/
total_size = program_bxcr(dimm_populated, iic0_dimm_addr,
num_dimm_banks);
/*
* program SDRAM Clock Timing Register (SDRAM0_CLKTR)
*/
mtsdram(mem_clktr, 0x40000000);
/*
* delay to ensure 200 usec has elapsed
*/
udelay(400);
/*
* enable the memory controller
*/
mfsdram(mem_cfg0, cfg0);
mtsdram(mem_cfg0, cfg0 | SDRAM_CFG0_DCEN);
/*
* wait for SDRAM_CFG0_DC_EN to complete
*/
while (1) {
mfsdram(mem_mcsts, mcsts);
if ((mcsts & SDRAM_MCSTS_MRSC) != 0) {
break;
}
}
/*
* program SDRAM Timing Register 1, adding some delays
*/
program_tr1();
/*
* if ECC is enabled, initialize parity bits
*/
return total_size;
}
unsigned char spd_read(uchar chip, uint addr)
{
unsigned char data[2];
#ifdef CFG_SIMULATE_SPD_EEPROM
if (chip == CFG_SIMULATE_SPD_EEPROM) {
/*
* Onboard spd eeprom requested -> simulate values
*/
return cfg_simulate_spd_eeprom[addr];
}
#endif /* CFG_SIMULATE_SPD_EEPROM */
if (i2c_probe(chip) == 0) {
if (i2c_read(chip, addr, 1, data, 1) == 0) {
return data[0];
}
}
return 0;
}
void get_spd_info(unsigned long* dimm_populated,
unsigned char* iic0_dimm_addr,
unsigned long num_dimm_banks)
{
unsigned long dimm_num;
unsigned long dimm_found;
unsigned char num_of_bytes;
unsigned char total_size;
dimm_found = FALSE;
for (dimm_num = 0; dimm_num < num_dimm_banks; dimm_num++) {
num_of_bytes = 0;
total_size = 0;
num_of_bytes = spd_read(iic0_dimm_addr[dimm_num], 0);
total_size = spd_read(iic0_dimm_addr[dimm_num], 1);
if ((num_of_bytes != 0) && (total_size != 0)) {
dimm_populated[dimm_num] = TRUE;
dimm_found = TRUE;
#if 0
printf("DIMM slot %lu: populated\n", dimm_num);
#endif
} else {
dimm_populated[dimm_num] = FALSE;
#if 0
printf("DIMM slot %lu: Not populated\n", dimm_num);
#endif
}
}
if (dimm_found == FALSE) {
printf("ERROR - No memory installed. Install a DDR-SDRAM DIMM.\n\n");
hang();
}
}
void check_mem_type(unsigned long* dimm_populated,
unsigned char* iic0_dimm_addr,
unsigned long num_dimm_banks)
{
unsigned long dimm_num;
unsigned char dimm_type;
for (dimm_num = 0; dimm_num < num_dimm_banks; dimm_num++) {
if (dimm_populated[dimm_num] == TRUE) {
dimm_type = spd_read(iic0_dimm_addr[dimm_num], 2);
switch (dimm_type) {
case 7:
#if 0
printf("DIMM slot %lu: DDR SDRAM detected\n", dimm_num);
#endif
break;
default:
printf("ERROR: Unsupported DIMM detected in slot %lu.\n",
dimm_num);
printf("Only DDR SDRAM DIMMs are supported.\n");
printf("Replace the DIMM module with a supported DIMM.\n\n");
hang();
break;
}
}
}
}
void check_volt_type(unsigned long* dimm_populated,
unsigned char* iic0_dimm_addr,
unsigned long num_dimm_banks)
{
unsigned long dimm_num;
unsigned long voltage_type;
for (dimm_num = 0; dimm_num < num_dimm_banks; dimm_num++) {
if (dimm_populated[dimm_num] == TRUE) {
voltage_type = spd_read(iic0_dimm_addr[dimm_num], 8);
if (voltage_type != 0x04) {
printf("ERROR: DIMM %lu with unsupported voltage level.\n",
dimm_num);
hang();
} else {
#if 0
printf("DIMM %lu voltage level supported.\n", dimm_num);
#endif
}
break;
}
}
}
void program_cfg0(unsigned long* dimm_populated,
unsigned char* iic0_dimm_addr,
unsigned long num_dimm_banks)
{
unsigned long dimm_num;
unsigned long cfg0;
unsigned long ecc_enabled;
unsigned char ecc;
unsigned char attributes;
unsigned long data_width;
unsigned long dimm_32bit;
unsigned long dimm_64bit;
/*
* get Memory Controller Options 0 data
*/
mfsdram(mem_cfg0, cfg0);
/*
* clear bits
*/
cfg0 &= ~(SDRAM_CFG0_DCEN | SDRAM_CFG0_MCHK_MASK |
SDRAM_CFG0_RDEN | SDRAM_CFG0_PMUD |
SDRAM_CFG0_DMWD_MASK |
SDRAM_CFG0_UIOS_MASK | SDRAM_CFG0_PDP);
/*
* FIXME: assume the DDR SDRAMs in both banks are the same
*/
ecc_enabled = TRUE;
for (dimm_num = 0; dimm_num < num_dimm_banks; dimm_num++) {
if (dimm_populated[dimm_num] == TRUE) {
ecc = spd_read(iic0_dimm_addr[dimm_num], 11);
if (ecc != 0x02) {
ecc_enabled = FALSE;
}
/*
* program Registered DIMM Enable
*/
attributes = spd_read(iic0_dimm_addr[dimm_num], 21);
if ((attributes & 0x02) != 0x00) {
cfg0 |= SDRAM_CFG0_RDEN;
}
/*
* program DDR SDRAM Data Width
*/
data_width =
(unsigned long)spd_read(iic0_dimm_addr[dimm_num],6) +
(((unsigned long)spd_read(iic0_dimm_addr[dimm_num],7)) << 8);
if (data_width == 64 || data_width == 72) {
dimm_64bit = TRUE;
cfg0 |= SDRAM_CFG0_DMWD_64;
} else if (data_width == 32 || data_width == 40) {
dimm_32bit = TRUE;
cfg0 |= SDRAM_CFG0_DMWD_32;
} else {
printf("WARNING: DIMM with datawidth of %lu bits.\n",
data_width);
printf("Only DIMMs with 32 or 64 bit datawidths supported.\n");
hang();
}
break;
}
}
/*
* program Memory Data Error Checking
*/
if (ecc_enabled == TRUE) {
cfg0 |= SDRAM_CFG0_MCHK_GEN;
} else {
cfg0 |= SDRAM_CFG0_MCHK_NON;
}
/*
* program Page Management Unit (0 == enabled)
*/
cfg0 &= ~SDRAM_CFG0_PMUD;
/*
* program Memory Controller Options 0
* Note: DCEN must be enabled after all DDR SDRAM controller
* configuration registers get initialized.
*/
mtsdram(mem_cfg0, cfg0);
}
void program_cfg1(unsigned long* dimm_populated,
unsigned char* iic0_dimm_addr,
unsigned long num_dimm_banks)
{
unsigned long cfg1;
mfsdram(mem_cfg1, cfg1);
/*
* Self-refresh exit, disable PM
*/
cfg1 &= ~(SDRAM_CFG1_SRE | SDRAM_CFG1_PMEN);
/*
* program Memory Controller Options 1
*/
mtsdram(mem_cfg1, cfg1);
}
void program_rtr (unsigned long* dimm_populated,
unsigned char* iic0_dimm_addr,
unsigned long num_dimm_banks)
{
unsigned long dimm_num;
unsigned long bus_period_x_10;
unsigned long refresh_rate = 0;
unsigned char refresh_rate_type;
unsigned long refresh_interval;
unsigned long sdram_rtr;
PPC440_SYS_INFO sys_info;
/*
* get the board info
*/
get_sys_info(&sys_info);
bus_period_x_10 = ONE_BILLION / (sys_info.freqPLB / 10);
for (dimm_num = 0; dimm_num < num_dimm_banks; dimm_num++) {
if (dimm_populated[dimm_num] == TRUE) {
refresh_rate_type = 0x7F & spd_read(iic0_dimm_addr[dimm_num], 12);
switch (refresh_rate_type) {
case 0x00:
refresh_rate = 15625;
break;
case 0x01:
refresh_rate = 15625/4;
break;
case 0x02:
refresh_rate = 15625/2;
break;
case 0x03:
refresh_rate = 15626*2;
break;
case 0x04:
refresh_rate = 15625*4;
break;
case 0x05:
refresh_rate = 15625*8;
break;
default:
printf("ERROR: DIMM %lu, unsupported refresh rate/type.\n",
dimm_num);
printf("Replace the DIMM module with a supported DIMM.\n");
break;
}
break;
}
}
refresh_interval = refresh_rate * 10 / bus_period_x_10;
sdram_rtr = (refresh_interval & 0x3ff8) << 16;
/*
* program Refresh Timer Register (SDRAM0_RTR)
*/
mtsdram(mem_rtr, sdram_rtr);
}
void program_tr0 (unsigned long* dimm_populated,
unsigned char* iic0_dimm_addr,
unsigned long num_dimm_banks)
{
unsigned long dimm_num;
unsigned long tr0;
unsigned char wcsbc;
unsigned char t_rp_ns;
unsigned char t_rcd_ns;
unsigned char t_ras_ns;
unsigned long t_rp_clk;
unsigned long t_ras_rcd_clk;
unsigned long t_rcd_clk;
unsigned long t_rfc_clk;
unsigned long plb_check;
unsigned char cas_bit;
unsigned long cas_index;
unsigned char cas_2_0_available;
unsigned char cas_2_5_available;
unsigned char cas_3_0_available;
unsigned long cycle_time_ns_x_10[3];
unsigned long tcyc_3_0_ns_x_10;
unsigned long tcyc_2_5_ns_x_10;
unsigned long tcyc_2_0_ns_x_10;
unsigned long tcyc_reg;
unsigned long bus_period_x_10;
PPC440_SYS_INFO sys_info;
unsigned long residue;
/*
* get the board info
*/
get_sys_info(&sys_info);
bus_period_x_10 = ONE_BILLION / (sys_info.freqPLB / 10);
/*
* get SDRAM Timing Register 0 (SDRAM_TR0) and clear bits
*/
mfsdram(mem_tr0, tr0);
tr0 &= ~(SDRAM_TR0_SDWR_MASK | SDRAM_TR0_SDWD_MASK |
SDRAM_TR0_SDCL_MASK | SDRAM_TR0_SDPA_MASK |
SDRAM_TR0_SDCP_MASK | SDRAM_TR0_SDLD_MASK |
SDRAM_TR0_SDRA_MASK | SDRAM_TR0_SDRD_MASK);
/*
* initialization
*/
wcsbc = 0;
t_rp_ns = 0;
t_rcd_ns = 0;
t_ras_ns = 0;
cas_2_0_available = TRUE;
cas_2_5_available = TRUE;
cas_3_0_available = TRUE;
tcyc_2_0_ns_x_10 = 0;
tcyc_2_5_ns_x_10 = 0;
tcyc_3_0_ns_x_10 = 0;
for (dimm_num = 0; dimm_num < num_dimm_banks; dimm_num++) {
if (dimm_populated[dimm_num] == TRUE) {
wcsbc = spd_read(iic0_dimm_addr[dimm_num], 15);
t_rp_ns = spd_read(iic0_dimm_addr[dimm_num], 27) >> 2;
t_rcd_ns = spd_read(iic0_dimm_addr[dimm_num], 29) >> 2;
t_ras_ns = spd_read(iic0_dimm_addr[dimm_num], 30);
cas_bit = spd_read(iic0_dimm_addr[dimm_num], 18);
for (cas_index = 0; cas_index < 3; cas_index++) {
switch (cas_index) {
case 0:
tcyc_reg = spd_read(iic0_dimm_addr[dimm_num], 9);
break;
case 1:
tcyc_reg = spd_read(iic0_dimm_addr[dimm_num], 23);
break;
default:
tcyc_reg = spd_read(iic0_dimm_addr[dimm_num], 25);
break;
}
if ((tcyc_reg & 0x0F) >= 10) {
printf("ERROR: Tcyc incorrect for DIMM in slot %lu\n",
dimm_num);
hang();
}
cycle_time_ns_x_10[cas_index] =
(((tcyc_reg & 0xF0) >> 4) * 10) + (tcyc_reg & 0x0F);
}
cas_index = 0;
if ((cas_bit & 0x80) != 0) {
cas_index += 3;
} else if ((cas_bit & 0x40) != 0) {
cas_index += 2;
} else if ((cas_bit & 0x20) != 0) {
cas_index += 1;
}
if (((cas_bit & 0x10) != 0) && (cas_index < 3)) {
tcyc_3_0_ns_x_10 = cycle_time_ns_x_10[cas_index];
cas_index++;
} else {
if (cas_index != 0) {
cas_index++;
}
cas_3_0_available = FALSE;
}
if (((cas_bit & 0x08) != 0) || (cas_index < 3)) {
tcyc_2_5_ns_x_10 = cycle_time_ns_x_10[cas_index];
cas_index++;
} else {
if (cas_index != 0) {
cas_index++;
}
cas_2_5_available = FALSE;
}
if (((cas_bit & 0x04) != 0) || (cas_index < 3)) {
tcyc_2_0_ns_x_10 = cycle_time_ns_x_10[cas_index];
cas_index++;
} else {
if (cas_index != 0) {
cas_index++;
}
cas_2_0_available = FALSE;
}
break;
}
}
/*
* Program SD_WR and SD_WCSBC fields
*/
tr0 |= SDRAM_TR0_SDWR_2_CLK; /* Write Recovery: 2 CLK */
switch (wcsbc) {
case 0:
tr0 |= SDRAM_TR0_SDWD_0_CLK;
break;
default:
tr0 |= SDRAM_TR0_SDWD_1_CLK;
break;
}
/*
* Program SD_CASL field
*/
if ((cas_2_0_available == TRUE) &&
(bus_period_x_10 >= tcyc_2_0_ns_x_10)) {
tr0 |= SDRAM_TR0_SDCL_2_0_CLK;
} else if ((cas_2_5_available == TRUE) &&
(bus_period_x_10 >= tcyc_2_5_ns_x_10)) {
tr0 |= SDRAM_TR0_SDCL_2_5_CLK;
} else if ((cas_3_0_available == TRUE) &&
(bus_period_x_10 >= tcyc_3_0_ns_x_10)) {
tr0 |= SDRAM_TR0_SDCL_3_0_CLK;
} else {
printf("ERROR: No supported CAS latency with the installed DIMMs.\n");
printf("Only CAS latencies of 2.0, 2.5, and 3.0 are supported.\n");
printf("Make sure the PLB speed is within the supported range.\n");
hang();
}
/*
* Calculate Trp in clock cycles and round up if necessary
* Program SD_PTA field
*/
t_rp_clk = sys_info.freqPLB * t_rp_ns / ONE_BILLION;
plb_check = ONE_BILLION * t_rp_clk / t_rp_ns;
if (sys_info.freqPLB != plb_check) {
t_rp_clk++;
}
switch ((unsigned long)t_rp_clk) {
case 0:
case 1:
case 2:
tr0 |= SDRAM_TR0_SDPA_2_CLK;
break;
case 3:
tr0 |= SDRAM_TR0_SDPA_3_CLK;
break;
default:
tr0 |= SDRAM_TR0_SDPA_4_CLK;
break;
}
/*
* Program SD_CTP field
*/
t_ras_rcd_clk = sys_info.freqPLB * (t_ras_ns - t_rcd_ns) / ONE_BILLION;
plb_check = ONE_BILLION * t_ras_rcd_clk / (t_ras_ns - t_rcd_ns);
if (sys_info.freqPLB != plb_check) {
t_ras_rcd_clk++;
}
switch (t_ras_rcd_clk) {
case 0:
case 1:
case 2:
tr0 |= SDRAM_TR0_SDCP_2_CLK;
break;
case 3:
tr0 |= SDRAM_TR0_SDCP_3_CLK;
break;
case 4:
tr0 |= SDRAM_TR0_SDCP_4_CLK;
break;
default:
tr0 |= SDRAM_TR0_SDCP_5_CLK;
break;
}
/*
* Program SD_LDF field
*/
tr0 |= SDRAM_TR0_SDLD_2_CLK;
/*
* Program SD_RFTA field
* FIXME tRFC hardcoded as 75 nanoseconds
*/
t_rfc_clk = sys_info.freqPLB / (ONE_BILLION / 75);
residue = sys_info.freqPLB % (ONE_BILLION / 75);
if (residue >= (ONE_BILLION / 150)) {
t_rfc_clk++;
}
switch (t_rfc_clk) {
case 0:
case 1:
case 2:
case 3:
case 4:
case 5:
case 6:
tr0 |= SDRAM_TR0_SDRA_6_CLK;
break;
case 7:
tr0 |= SDRAM_TR0_SDRA_7_CLK;
break;
case 8:
tr0 |= SDRAM_TR0_SDRA_8_CLK;
break;
case 9:
tr0 |= SDRAM_TR0_SDRA_9_CLK;
break;
case 10:
tr0 |= SDRAM_TR0_SDRA_10_CLK;
break;
case 11:
tr0 |= SDRAM_TR0_SDRA_11_CLK;
break;
case 12:
tr0 |= SDRAM_TR0_SDRA_12_CLK;
break;
default:
tr0 |= SDRAM_TR0_SDRA_13_CLK;
break;
}
/*
* Program SD_RCD field
*/
t_rcd_clk = sys_info.freqPLB * t_rcd_ns / ONE_BILLION;
plb_check = ONE_BILLION * t_rcd_clk / t_rcd_ns;
if (sys_info.freqPLB != plb_check) {
t_rcd_clk++;
}
switch (t_rcd_clk) {
case 0:
case 1:
case 2:
tr0 |= SDRAM_TR0_SDRD_2_CLK;
break;
case 3:
tr0 |= SDRAM_TR0_SDRD_3_CLK;
break;
default:
tr0 |= SDRAM_TR0_SDRD_4_CLK;
break;
}
#if 0
printf("tr0: %x\n", tr0);
#endif
mtsdram(mem_tr0, tr0);
}
void program_tr1 (void)
{
unsigned long tr0;
unsigned long tr1;
unsigned long cfg0;
unsigned long ecc_temp;
unsigned long dlycal;
unsigned long dly_val;
unsigned long i, j, k;
unsigned long bxcr_num;
unsigned long max_pass_length;
unsigned long current_pass_length;
unsigned long current_fail_length;
unsigned long current_start;
unsigned long rdclt;
unsigned long rdclt_offset;
long max_start;
long max_end;
long rdclt_average;
unsigned char window_found;
unsigned char fail_found;
unsigned char pass_found;
unsigned long * membase;
PPC440_SYS_INFO sys_info;
/*
* get the board info
*/
get_sys_info(&sys_info);
/*
* get SDRAM Timing Register 0 (SDRAM_TR0) and clear bits
*/
mfsdram(mem_tr1, tr1);
tr1 &= ~(SDRAM_TR1_RDSS_MASK | SDRAM_TR1_RDSL_MASK |
SDRAM_TR1_RDCD_MASK | SDRAM_TR1_RDCT_MASK);
mfsdram(mem_tr0, tr0);
if (((tr0 & SDRAM_TR0_SDCL_MASK) == SDRAM_TR0_SDCL_2_5_CLK) &&
(sys_info.freqPLB > 100000000)) {
tr1 |= SDRAM_TR1_RDSS_TR2;
tr1 |= SDRAM_TR1_RDSL_STAGE3;
tr1 |= SDRAM_TR1_RDCD_RCD_1_2;
} else {
tr1 |= SDRAM_TR1_RDSS_TR1;
tr1 |= SDRAM_TR1_RDSL_STAGE2;
tr1 |= SDRAM_TR1_RDCD_RCD_0_0;
}
/*
* save CFG0 ECC setting to a temporary variable and turn ECC off
*/
mfsdram(mem_cfg0, cfg0);
ecc_temp = cfg0 & SDRAM_CFG0_MCHK_MASK;
mtsdram(mem_cfg0, (cfg0 & ~SDRAM_CFG0_MCHK_MASK) | SDRAM_CFG0_MCHK_NON);
/*
* get the delay line calibration register value
*/
mfsdram(mem_dlycal, dlycal);
dly_val = SDRAM_DLYCAL_DLCV_DECODE(dlycal) << 2;
max_pass_length = 0;
max_start = 0;
max_end = 0;
current_pass_length = 0;
current_fail_length = 0;
current_start = 0;
rdclt_offset = 0;
window_found = FALSE;
fail_found = FALSE;
pass_found = FALSE;
#ifdef DEBUG
printf("Starting memory test ");
#endif
for (k = 0; k < NUMHALFCYCLES; k++) {
for (rdclt = 0; rdclt < dly_val; rdclt++) {
/*
* Set the timing reg for the test.
*/
mtsdram(mem_tr1, (tr1 | SDRAM_TR1_RDCT_ENCODE(rdclt)));
for (bxcr_num = 0; bxcr_num < MAXBXCR; bxcr_num++) {
mtdcr(memcfga, mem_b0cr + (bxcr_num<<2));
if ((mfdcr(memcfgd) & SDRAM_BXCR_SDBE) == SDRAM_BXCR_SDBE) {
/* Bank is enabled */
membase = (unsigned long*)
(mfdcr(memcfgd) & SDRAM_BXCR_SDBA_MASK);
/*
* Run the short memory test
*/
for (i = 0; i < NUMMEMTESTS; i++) {
for (j = 0; j < NUMMEMWORDS; j++) {
membase[j] = test[i][j];
ppcDcbf((unsigned long)&(membase[j]));
}
for (j = 0; j < NUMMEMWORDS; j++) {
if (membase[j] != test[i][j]) {
ppcDcbf((unsigned long)&(membase[j]));
break;
}
ppcDcbf((unsigned long)&(membase[j]));
}
if (j < NUMMEMWORDS) {
break;
}
}
/*
* see if the rdclt value passed
*/
if (i < NUMMEMTESTS) {
break;
}
}
}
if (bxcr_num == MAXBXCR) {
if (fail_found == TRUE) {
pass_found = TRUE;
if (current_pass_length == 0) {
current_start = rdclt_offset + rdclt;
}
current_fail_length = 0;
current_pass_length++;
if (current_pass_length > max_pass_length) {
max_pass_length = current_pass_length;
max_start = current_start;
max_end = rdclt_offset + rdclt;
}
}
} else {
current_pass_length = 0;
current_fail_length++;
if (current_fail_length >= (dly_val>>2)) {
if (fail_found == FALSE) {
fail_found = TRUE;
} else if (pass_found == TRUE) {
window_found = TRUE;
break;
}
}
}
}
#ifdef DEBUG
printf(".");
#endif
if (window_found == TRUE) {
break;
}
tr1 = tr1 ^ SDRAM_TR1_RDCD_MASK;
rdclt_offset += dly_val;
}
#ifdef DEBUG
printf("\n");
#endif
/*
* make sure we find the window
*/
if (window_found == FALSE) {
printf("ERROR: Cannot determine a common read delay.\n");
hang();
}
/*
* restore the orignal ECC setting
*/
mtsdram(mem_cfg0, (cfg0 & ~SDRAM_CFG0_MCHK_MASK) | ecc_temp);
/*
* set the SDRAM TR1 RDCD value
*/
tr1 &= ~SDRAM_TR1_RDCD_MASK;
if ((tr0 & SDRAM_TR0_SDCL_MASK) == SDRAM_TR0_SDCL_2_5_CLK) {
tr1 |= SDRAM_TR1_RDCD_RCD_1_2;
} else {
tr1 |= SDRAM_TR1_RDCD_RCD_0_0;
}
/*
* set the SDRAM TR1 RDCLT value
*/
tr1 &= ~SDRAM_TR1_RDCT_MASK;
while (max_end >= (dly_val << 1)) {
max_end -= (dly_val << 1);
max_start -= (dly_val << 1);
}
rdclt_average = ((max_start + max_end) >> 1);
if (rdclt_average >= 0x60)
while (1)
;
if (rdclt_average < 0) {
rdclt_average = 0;
}
if (rdclt_average >= dly_val) {
rdclt_average -= dly_val;
tr1 = tr1 ^ SDRAM_TR1_RDCD_MASK;
}
tr1 |= SDRAM_TR1_RDCT_ENCODE(rdclt_average);
#if 0
printf("tr1: %x\n", tr1);
#endif
/*
* program SDRAM Timing Register 1 TR1
*/
mtsdram(mem_tr1, tr1);
}
unsigned long program_bxcr(unsigned long* dimm_populated,
unsigned char* iic0_dimm_addr,
unsigned long num_dimm_banks)
{
unsigned long dimm_num;
unsigned long bank_base_addr;
unsigned long cr;
unsigned long i;
unsigned long j;
unsigned long temp;
unsigned char num_row_addr;
unsigned char num_col_addr;
unsigned char num_banks;
unsigned char bank_size_id;
unsigned long ctrl_bank_num[MAXBANKS];
unsigned long bx_cr_num;
unsigned long largest_size_index;
unsigned long largest_size;
unsigned long current_size_index;
BANKPARMS bank_parms[MAXBXCR];
unsigned long sorted_bank_num[MAXBXCR]; /* DDR Controller bank number table (sorted by size) */
unsigned long sorted_bank_size[MAXBXCR]; /* DDR Controller bank size table (sorted by size)*/
/*
* Set the BxCR regs. First, wipe out the bank config registers.
*/
for (bx_cr_num = 0; bx_cr_num < MAXBXCR; bx_cr_num++) {
mtdcr(memcfga, mem_b0cr + (bx_cr_num << 2));
mtdcr(memcfgd, 0x00000000);
bank_parms[bx_cr_num].bank_size_bytes = 0;
}
#ifdef CONFIG_BAMBOO
/*
* This next section is hardware dependent and must be programmed
* to match the hardware. For bammboo, the following holds...
* 1. SDRAM0_B0CR: Bank 0 of dimm 0 ctrl_bank_num : 0
* 2. SDRAM0_B1CR: Bank 0 of dimm 1 ctrl_bank_num : 1
* 3. SDRAM0_B2CR: Bank 1 of dimm 1 ctrl_bank_num : 1
* 4. SDRAM0_B3CR: Bank 0 of dimm 2 ctrl_bank_num : 3
* ctrl_bank_num corresponds to the first usable DDR controller bank number by DIMM
*/
ctrl_bank_num[0] = 0;
ctrl_bank_num[1] = 1;
ctrl_bank_num[2] = 3;
#else
ctrl_bank_num[0] = 0;
ctrl_bank_num[1] = 1;
ctrl_bank_num[2] = 2;
ctrl_bank_num[3] = 3;
#endif
/*
* reset the bank_base address
*/
bank_base_addr = CFG_SDRAM_BASE;
for (dimm_num = 0; dimm_num < num_dimm_banks; dimm_num++) {
if (dimm_populated[dimm_num] == TRUE) {
num_row_addr = spd_read(iic0_dimm_addr[dimm_num], 3);
num_col_addr = spd_read(iic0_dimm_addr[dimm_num], 4);
num_banks = spd_read(iic0_dimm_addr[dimm_num], 5);
bank_size_id = spd_read(iic0_dimm_addr[dimm_num], 31);
/*
* Set the SDRAM0_BxCR regs
*/
cr = 0;
switch (bank_size_id) {
case 0x02:
cr |= SDRAM_BXCR_SDSZ_8;
break;
case 0x04:
cr |= SDRAM_BXCR_SDSZ_16;
break;
case 0x08:
cr |= SDRAM_BXCR_SDSZ_32;
break;
case 0x10:
cr |= SDRAM_BXCR_SDSZ_64;
break;
case 0x20:
cr |= SDRAM_BXCR_SDSZ_128;
break;
case 0x40:
cr |= SDRAM_BXCR_SDSZ_256;
break;
case 0x80:
cr |= SDRAM_BXCR_SDSZ_512;
break;
default:
printf("DDR-SDRAM: DIMM %lu BxCR configuration.\n",
dimm_num);
printf("ERROR: Unsupported value for the banksize: %d.\n",
bank_size_id);
printf("Replace the DIMM module with a supported DIMM.\n\n");
hang();
}
switch (num_col_addr) {
case 0x08:
cr |= SDRAM_BXCR_SDAM_1;
break;
case 0x09:
cr |= SDRAM_BXCR_SDAM_2;
break;
case 0x0A:
cr |= SDRAM_BXCR_SDAM_3;
break;
case 0x0B:
cr |= SDRAM_BXCR_SDAM_4;
break;
default:
printf("DDR-SDRAM: DIMM %lu BxCR configuration.\n",
dimm_num);
printf("ERROR: Unsupported value for number of "
"column addresses: %d.\n", num_col_addr);
printf("Replace the DIMM module with a supported DIMM.\n\n");
hang();
}
/*
* enable the bank
*/
cr |= SDRAM_BXCR_SDBE;
for (i = 0; i < num_banks; i++) {
bank_parms[ctrl_bank_num[dimm_num]+i].bank_size_bytes =
(4 * 1024 * 1024) * bank_size_id;
bank_parms[ctrl_bank_num[dimm_num]+i].cr = cr;
}
}
}
/* Initialize sort tables */
for (i = 0; i < MAXBXCR; i++) {
sorted_bank_num[i] = i;
sorted_bank_size[i] = bank_parms[i].bank_size_bytes;
}
for (i = 0; i < MAXBXCR-1; i++) {
largest_size = sorted_bank_size[i];
largest_size_index = 255;
/* Find the largest remaining value */
for (j = i + 1; j < MAXBXCR; j++) {
if (sorted_bank_size[j] > largest_size) {
/* Save largest remaining value and its index */
largest_size = sorted_bank_size[j];
largest_size_index = j;
}
}
if (largest_size_index != 255) {
/* Swap the current and largest values */
current_size_index = sorted_bank_num[largest_size_index];
sorted_bank_size[largest_size_index] = sorted_bank_size[i];
sorted_bank_size[i] = largest_size;
sorted_bank_num[largest_size_index] = sorted_bank_num[i];
sorted_bank_num[i] = current_size_index;
}
}
/* Set the SDRAM0_BxCR regs thanks to sort tables */
for (bx_cr_num = 0, bank_base_addr = 0; bx_cr_num < MAXBXCR; bx_cr_num++) {
if (bank_parms[sorted_bank_num[bx_cr_num]].bank_size_bytes) {
mtdcr(memcfga, mem_b0cr + (sorted_bank_num[bx_cr_num] << 2));
temp = mfdcr(memcfgd) & ~(SDRAM_BXCR_SDBA_MASK | SDRAM_BXCR_SDSZ_MASK |
SDRAM_BXCR_SDAM_MASK | SDRAM_BXCR_SDBE);
temp = temp | (bank_base_addr & SDRAM_BXCR_SDBA_MASK) |
bank_parms[sorted_bank_num[bx_cr_num]].cr;
mtdcr(memcfgd, temp);
bank_base_addr += bank_parms[sorted_bank_num[bx_cr_num]].bank_size_bytes;
}
}
return(bank_base_addr);
}
void program_ecc (unsigned long num_bytes)
{
unsigned long bank_base_addr;
unsigned long current_address;
unsigned long end_address;
unsigned long address_increment;
unsigned long cfg0;
/*
* get Memory Controller Options 0 data
*/
mfsdram(mem_cfg0, cfg0);
/*
* reset the bank_base address
*/
bank_base_addr = CFG_SDRAM_BASE;
if ((cfg0 & SDRAM_CFG0_MCHK_MASK) != SDRAM_CFG0_MCHK_NON) {
mtsdram(mem_cfg0, (cfg0 & ~SDRAM_CFG0_MCHK_MASK) |
SDRAM_CFG0_MCHK_GEN);
if ((cfg0 & SDRAM_CFG0_DMWD_MASK) == SDRAM_CFG0_DMWD_32) {
address_increment = 4;
} else {
address_increment = 8;
}
current_address = (unsigned long)(bank_base_addr);
end_address = (unsigned long)(bank_base_addr) + num_bytes;
while (current_address < end_address) {
*((unsigned long*)current_address) = 0x00000000;
current_address += address_increment;
}
mtsdram(mem_cfg0, (cfg0 & ~SDRAM_CFG0_MCHK_MASK) |
SDRAM_CFG0_MCHK_CHK);
}
}
#endif /* CONFIG_SPD_EEPROM */
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