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u-boot/arch/powerpc/cpu/ppc4xx/44x_spd_ddr.c
Stefan Roese a47a12becf Move arch/ppc to arch/powerpc 
As discussed on the list, move "arch/ppc" to "arch/powerpc" to
better match the Linux directory structure.

Please note that this patch also changes the "ppc" target in
MAKEALL to "powerpc" to match this new infrastructure. But "ppc"
is kept as an alias for now, to not break compatibility with
scripts using this name.

Signed-off-by: Stefan Roese <sr@denx.de>
Acked-by: Wolfgang Denk <wd@denx.de>
Acked-by: Detlev Zundel <dzu@denx.de>
Acked-by: Kim Phillips <kim.phillips@freescale.com>
Cc: Peter Tyser <ptyser@xes-inc.com>
Cc: Anatolij Gustschin <agust@denx.de>
2010-04-21 23:42:38 +02:00

1248 lines
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/*
* arch/powerpc/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 2005-2007
* 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
*/
/* define DEBUG for debugging output (obviously ;-)) */
#if 0
#define DEBUG
#endif
#include <common.h>
#include <asm/processor.h>
#include <i2c.h>
#include <ppc4xx.h>
#include <asm/mmu.h>
#include "ecc.h"
#if defined(CONFIG_SPD_EEPROM) && \
(defined(CONFIG_440GP) || defined(CONFIG_440GX) || \
defined(CONFIG_440EP) || defined(CONFIG_440GR))
/*
* Set default values
*/
#ifndef CONFIG_SYS_I2C_SPEED
#define CONFIG_SYS_I2C_SPEED 50000
#endif
#define ONE_BILLION 1000000000
/*
* Board-specific Platform code can reimplement spd_ddr_init_hang () if needed
*/
void __spd_ddr_init_hang (void)
{
hang ();
}
void spd_ddr_init_hang (void) __attribute__((weak, alias("__spd_ddr_init_hang")));
/*-----------------------------------------------------------------------------+
| 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
/*
* This DDR2 setup code can dynamically setup the TLB entries for the DDR2 memory
* region. Right now the cache should still be disabled in U-Boot because of the
* EMAC driver, that need it's buffer descriptor to be located in non cached
* memory.
*
* If at some time this restriction doesn't apply anymore, just define
* CONFIG_4xx_DCACHE in the board config file and this code should setup
* everything correctly.
*/
#ifdef CONFIG_4xx_DCACHE
#define MY_TLB_WORD2_I_ENABLE 0 /* enable caching on SDRAM */
#else
#define MY_TLB_WORD2_I_ENABLE TLB_WORD2_I_ENABLE /* disable caching on SDRAM */
#endif
/* 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 CONFIG_SYS_SIMULATE_SPD_EEPROM
extern const unsigned char cfg_simulate_spd_eeprom[128];
#endif
static unsigned char spd_read(uchar chip, uint addr);
static void get_spd_info(unsigned long *dimm_populated,
unsigned char *iic0_dimm_addr,
unsigned long num_dimm_banks);
static void check_mem_type(unsigned long *dimm_populated,
unsigned char *iic0_dimm_addr,
unsigned long num_dimm_banks);
static void check_volt_type(unsigned long *dimm_populated,
unsigned char *iic0_dimm_addr,
unsigned long num_dimm_banks);
static void program_cfg0(unsigned long *dimm_populated,
unsigned char *iic0_dimm_addr,
unsigned long num_dimm_banks);
static void program_cfg1(unsigned long *dimm_populated,
unsigned char *iic0_dimm_addr,
unsigned long num_dimm_banks);
static void program_rtr(unsigned long *dimm_populated,
unsigned char *iic0_dimm_addr,
unsigned long num_dimm_banks);
static void program_tr0(unsigned long *dimm_populated,
unsigned char *iic0_dimm_addr,
unsigned long num_dimm_banks);
static void program_tr1(void);
static 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(CONFIG_SYS_I2C_SPEED, CONFIG_SYS_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)
/*
* Soft-reset SDRAM controller.
*/
mtsdr(SDR0_SRST, SDR0_SRST_DMC);
mtsdr(SDR0_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);
#ifdef CONFIG_PROG_SDRAM_TLB /* this define should eventually be removed */
/* and program tlb entries for this size (dynamic) */
program_tlb(0, 0, total_size, MY_TLB_WORD2_I_ENABLE);
#endif
/*
* program SDRAM Clock Timing Register (SDRAM0_CLKTR)
*/
mtsdram(SDRAM0_CLKTR, 0x40000000);
/*
* delay to ensure 200 usec has elapsed
*/
udelay(400);
/*
* enable the memory controller
*/
mfsdram(SDRAM0_CFG0, cfg0);
mtsdram(SDRAM0_CFG0, cfg0 | SDRAM_CFG0_DCEN);
/*
* wait for SDRAM_CFG0_DC_EN to complete
*/
while (1) {
mfsdram(SDRAM0_MCSTS, mcsts);
if ((mcsts & SDRAM_MCSTS_MRSC) != 0)
break;
}
/*
* program SDRAM Timing Register 1, adding some delays
*/
program_tr1();
#ifdef CONFIG_DDR_ECC
/*
* If ecc is enabled, initialize the parity bits.
*/
ecc_init(CONFIG_SYS_SDRAM_BASE, total_size);
#endif
return total_size;
}
static unsigned char spd_read(uchar chip, uint addr)
{
unsigned char data[2];
#ifdef CONFIG_SYS_SIMULATE_SPD_EEPROM
if (chip == CONFIG_SYS_SIMULATE_SPD_EEPROM) {
/*
* Onboard spd eeprom requested -> simulate values
*/
return cfg_simulate_spd_eeprom[addr];
}
#endif /* CONFIG_SYS_SIMULATE_SPD_EEPROM */
if (i2c_probe(chip) == 0) {
if (i2c_read(chip, addr, 1, data, 1) == 0) {
return data[0];
}
}
return 0;
}
static 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;
debug("DIMM slot %lu: populated\n", dimm_num);
} else {
dimm_populated[dimm_num] = FALSE;
debug("DIMM slot %lu: Not populated\n", dimm_num);
}
}
if (dimm_found == FALSE) {
printf("ERROR - No memory installed. Install a DDR-SDRAM DIMM.\n\n");
spd_ddr_init_hang ();
}
}
static 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:
debug("DIMM slot %lu: DDR SDRAM detected\n", dimm_num);
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");
spd_ddr_init_hang ();
break;
}
}
}
}
static 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);
spd_ddr_init_hang ();
} else {
debug("DIMM %lu voltage level supported.\n", dimm_num);
}
break;
}
}
}
static 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(SDRAM0_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");
spd_ddr_init_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(SDRAM0_CFG0, cfg0);
}
static void program_cfg1(unsigned long *dimm_populated,
unsigned char *iic0_dimm_addr,
unsigned long num_dimm_banks)
{
unsigned long cfg1;
mfsdram(SDRAM0_CFG1, cfg1);
/*
* Self-refresh exit, disable PM
*/
cfg1 &= ~(SDRAM_CFG1_SRE | SDRAM_CFG1_PMEN);
/*
* program Memory Controller Options 1
*/
mtsdram(SDRAM0_CFG1, cfg1);
}
static 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;
PPC4xx_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(SDRAM0_RTR, sdram_rtr);
}
static 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;
PPC4xx_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(SDRAM0_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);
spd_ddr_init_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");
spd_ddr_init_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;
}
debug("tr0: %x\n", tr0);
mtsdram(SDRAM0_TR0, tr0);
}
static int short_mem_test(void)
{
unsigned long i, j;
unsigned long bxcr_num;
unsigned long *membase;
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}};
for (bxcr_num = 0; bxcr_num < MAXBXCR; bxcr_num++) {
mtdcr(SDRAM0_CFGADDR, SDRAM0_B0CR + (bxcr_num << 2));
if ((mfdcr(SDRAM0_CFGDATA) & SDRAM_BXCR_SDBE) == SDRAM_BXCR_SDBE) {
/* Bank is enabled */
membase = (unsigned long*)
(mfdcr(SDRAM0_CFGDATA) & SDRAM_BXCR_SDBA_MASK);
/*
* Run the short memory test
*/
for (i = 0; i < NUMMEMTESTS; i++) {
for (j = 0; j < NUMMEMWORDS; j++) {
/* printf("bank enabled base:%x\n", &membase[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]));
return 0;
}
ppcDcbf((unsigned long)&(membase[j]));
}
if (j < NUMMEMWORDS)
return 0;
}
/*
* see if the rdclt value passed
*/
if (i < NUMMEMTESTS)
return 0;
}
}
return 1;
}
static 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 k;
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;
PPC4xx_SYS_INFO sys_info;
/*
* get the board info
*/
get_sys_info(&sys_info);
/*
* get SDRAM Timing Register 0 (SDRAM_TR0) and clear bits
*/
mfsdram(SDRAM0_TR1, tr1);
tr1 &= ~(SDRAM_TR1_RDSS_MASK | SDRAM_TR1_RDSL_MASK |
SDRAM_TR1_RDCD_MASK | SDRAM_TR1_RDCT_MASK);
mfsdram(SDRAM0_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(SDRAM0_CFG0, cfg0);
ecc_temp = cfg0 & SDRAM_CFG0_MCHK_MASK;
mtsdram(SDRAM0_CFG0, (cfg0 & ~SDRAM_CFG0_MCHK_MASK) | SDRAM_CFG0_MCHK_NON);
/*
* get the delay line calibration register value
*/
mfsdram(SDRAM0_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;
debug("Starting memory test ");
for (k = 0; k < NUMHALFCYCLES; k++) {
for (rdclt = 0; rdclt < dly_val; rdclt++) {
/*
* Set the timing reg for the test.
*/
mtsdram(SDRAM0_TR1, (tr1 | SDRAM_TR1_RDCT_ENCODE(rdclt)));
if (short_mem_test()) {
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;
}
}
}
}
debug(".");
if (window_found == TRUE) {
break;
}
tr1 = tr1 ^ SDRAM_TR1_RDCD_MASK;
rdclt_offset += dly_val;
}
debug("\n");
/*
* make sure we find the window
*/
if (window_found == FALSE) {
printf("ERROR: Cannot determine a common read delay.\n");
spd_ddr_init_hang ();
}
/*
* restore the orignal ECC setting
*/
mtsdram(SDRAM0_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 < 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);
debug("tr1: %x\n", tr1);
/*
* program SDRAM Timing Register 1 TR1
*/
mtsdram(SDRAM0_TR1, tr1);
}
static 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(SDRAM0_CFGADDR, SDRAM0_B0CR + (bx_cr_num << 2));
mtdcr(SDRAM0_CFGDATA, 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 bamboo, the following holds...
* 1. SDRAM0_B0CR: Bank 0 of dimm 0 ctrl_bank_num : 0 (soldered onboard)
* 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
/*
* Ocotea, Ebony and the other IBM/AMCC eval boards have
* 2 DIMM slots with each max 2 banks
*/
ctrl_bank_num[0] = 0;
ctrl_bank_num[1] = 2;
#endif
/*
* reset the bank_base address
*/
bank_base_addr = CONFIG_SYS_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);
debug("DIMM%d: row=%d col=%d banks=%d\n", dimm_num,
num_row_addr, num_col_addr, num_banks);
/*
* 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");
spd_ddr_init_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");
spd_ddr_init_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 << 20) * bank_size_id;
bank_parms[ctrl_bank_num[dimm_num]+i].cr = cr;
debug("DIMM%d-bank %d (SDRAM0_B%dCR): bank_size_bytes=%d\n",
dimm_num, i, ctrl_bank_num[dimm_num]+i,
bank_parms[ctrl_bank_num[dimm_num]+i].bank_size_bytes);
}
}
}
/* 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(SDRAM0_CFGADDR, SDRAM0_B0CR + (sorted_bank_num[bx_cr_num] << 2));
temp = mfdcr(SDRAM0_CFGDATA) & ~(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(SDRAM0_CFGDATA, temp);
bank_base_addr += bank_parms[sorted_bank_num[bx_cr_num]].bank_size_bytes;
debug("SDRAM0_B%dCR=0x%08lx\n", sorted_bank_num[bx_cr_num], temp);
}
}
return(bank_base_addr);
}
#endif /* CONFIG_SPD_EEPROM */
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