u-boot/board/tqc/tqm85xx/sdram.c
Becky Bruce 51f924e5ce board/tqm85xx: Create and tear down TLB for get_ram_size()
We need a TLB entry to call get_ram_size(); the common code doesn't create
one until *after* fixed_sdram() has determined the size.  So we set up tlbs
for the max possible size and tear them down once we're done with
get_ram_size(); the common 85xx code will then set up a final set of tlb
entries for the *actual* detected size of ddr.

This prevents us from having TLB entries that are larger than DDR sitting
around for very long, which is not a recommended scenario.

Signed-off-by: Becky Bruce <beckyb@kernel.crashing.org>
Signed-off-by: Kumar Gala <galak@kernel.crashing.org>
2011-07-22 03:07:47 -05:00

436 lines
12 KiB
C

/*
* (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 <asm/immap_85xx.h>
#include <asm/processor.h>
#include <asm/mmu.h>
struct sdram_conf_s {
unsigned long size;
unsigned long reg;
#ifdef CONFIG_TQM8548
unsigned long refresh;
#endif /* CONFIG_TQM8548 */
};
typedef struct sdram_conf_s sdram_conf_t;
#ifdef CONFIG_TQM8548
#ifdef CONFIG_TQM8548_AG
sdram_conf_t ddr_cs_conf[] = {
{(1024 << 20), 0x80044202, 0x0002D000}, /* 1024MB, 14x10(4) */
{ (512 << 20), 0x80044102, 0x0001A000}, /* 512MB, 13x10(4) */
{ (256 << 20), 0x80040102, 0x00014000}, /* 256MB, 13x10(4) */
{ (128 << 20), 0x80040101, 0x0000C000}, /* 128MB, 13x9(4) */
};
#else /* !CONFIG_TQM8548_AG */
sdram_conf_t ddr_cs_conf[] = {
{(512 << 20), 0x80044102, 0x0001A000}, /* 512MB, 13x10(4) */
{(256 << 20), 0x80040102, 0x00014000}, /* 256MB, 13x10(4) */
{(128 << 20), 0x80040101, 0x0000C000}, /* 128MB, 13x9(4) */
};
#endif /* CONFIG_TQM8548_AG */
#else /* !CONFIG_TQM8548 */
sdram_conf_t ddr_cs_conf[] = {
{(512 << 20), 0x80000202}, /* 512MB, 14x10(4) */
{(256 << 20), 0x80000102}, /* 256MB, 13x10(4) */
{(128 << 20), 0x80000101}, /* 128MB, 13x9(4) */
{( 64 << 20), 0x80000001}, /* 64MB, 12x9(4) */
};
#endif /* CONFIG_TQM8548 */
#define N_DDR_CS_CONF (sizeof(ddr_cs_conf) / sizeof(ddr_cs_conf[0]))
int cas_latency (void);
static phys_size_t sdram_setup(int);
/*
* Autodetect onboard DDR SDRAM on 85xx platforms
*
* NOTE: Some of the hardcoded values are hardware dependant,
* so this should be extended for other future boards
* using this routine!
*/
phys_size_t fixed_sdram(void)
{
int casl = 0;
phys_size_t dram_size = 0;
casl = cas_latency();
dram_size = sdram_setup(casl);
if ((dram_size == 0) && (casl != CONFIG_DDR_DEFAULT_CL)) {
/*
* Try again with default CAS latency
*/
printf("Problem with CAS lantency, using default CL %d/10!\n",
CONFIG_DDR_DEFAULT_CL);
dram_size = sdram_setup(CONFIG_DDR_DEFAULT_CL);
puts(" ");
}
return dram_size;
}
static phys_size_t sdram_setup(int casl)
{
int i;
volatile ccsr_ddr_t *ddr = (void *)(CONFIG_SYS_MPC85xx_DDR_ADDR);
#ifdef CONFIG_TQM8548
volatile ccsr_gur_t *gur = (void *)(CONFIG_SYS_MPC85xx_GUTS_ADDR);
#if defined(CONFIG_TQM8548_AG) || defined(CONFIG_TQM8548_BE)
volatile ccsr_local_ecm_t *ecm = (void *)(CONFIG_SYS_MPC85xx_ECM_ADDR);
#endif
#else /* !CONFIG_TQM8548 */
unsigned long cfg_ddr_timing1;
unsigned long cfg_ddr_mode;
#endif /* CONFIG_TQM8548 */
/*
* Disable memory controller.
*/
ddr->cs0_config = 0;
ddr->sdram_cfg = 0;
#ifdef CONFIG_TQM8548
/* Timing and refresh settings for DDR2-533 and below */
ddr->cs0_bnds = (ddr_cs_conf[0].size - 1) >> 24;
ddr->cs0_config = ddr_cs_conf[0].reg;
ddr->timing_cfg_3 = 0x00020000;
/* TIMING CFG 1, 533MHz
* PRETOACT: 4 Clocks
* ACTTOPRE: 12 Clocks
* ACTTORW: 4 Clocks
* CASLAT: 4 Clocks
* REFREC: EXT_REFREC:REFREC 53 Clocks
* WRREC: 4 Clocks
* ACTTOACT: 3 Clocks
* WRTORD: 2 Clocks
*/
ddr->timing_cfg_1 = 0x4C47D432;
/* TIMING CFG 2, 533MHz
* ADD_LAT: 3 Clocks
* CPO: READLAT + 1
* WR_LAT: 3 Clocks
* RD_TO_PRE: 2 Clocks
* WR_DATA_DELAY: 1/2 Clock
* CKE_PLS: 3 Clock
* FOUR_ACT: 14 Clocks
*/
ddr->timing_cfg_2 = 0x331848CE;
/* DDR SDRAM Mode, 533MHz
* MRS: Extended Mode Register
* OUT: Outputs enabled
* RDQS: no
* DQS: enabled
* OCD: default state
* RTT: 75 Ohms
* Posted CAS: 3 Clocks
* ODS: reduced strength
* DLL: enabled
* MR: Mode Register
* PD: fast exit
* WR: 4 Clocks
* DLL: no DLL reset
* TM: normal
* CAS latency: 4 Clocks
* BT: sequential
* Burst length: 4
*/
ddr->sdram_mode = 0x439E0642;
/* DDR SDRAM Interval, 533MHz
* REFINT: 1040 Clocks
* BSTOPRE: 256
*/
ddr->sdram_interval = (1040 << 16) | 0x100;
/*
* Workaround for erratum DDR19 according to MPC8548 Device Errata
* document, Rev. 1: DDR IO receiver must be set to an acceptable
* bias point by modifying a hidden register.
*/
if (SVR_REV (get_svr ()) < 0x21)
gur->ddrioovcr = 0x90000000; /* enable, VSEL 1.8V */
/* DDR SDRAM CFG 2
* FRC_SR: normal mode
* SR_IE: no self-refresh interrupt
* DLL_RST_DIS: don't care, leave at reset value
* DQS_CFG: differential DQS signals
* ODT_CFG: assert ODT to internal IOs only during reads to DRAM
* LVWx_CFG: don't care, leave at reset value
* NUM_PR: 1 refresh will be issued at a time
* DM_CFG: don't care, leave at reset value
* D_INIT: no data initialization
*/
ddr->sdram_cfg_2 = 0x04401000;
/* DDR SDRAM MODE 2
* MRS: Extended Mode Register 2
*/
ddr->sdram_mode_2 = 0x8000C000;
/* DDR SDRAM CLK CNTL
* CLK_ADJUST: 1/2 Clock 0x02000000
* CLK_ADJUST: 5/8 Clock 0x02800000
*/
ddr->sdram_clk_cntl = 0x02800000;
/* wait for clock stabilization */
asm ("sync;isync;msync");
udelay (1000);
#if defined(CONFIG_TQM8548_AG) || defined(CONFIG_TQM8548_BE)
/*
* Workaround for erratum DDR20 according to MPC8548 Device Errata
* document, Rev. 1: "CKE signal may not function correctly after
* assertion of HRESET"
*/
/* 1. Configure DDR register as is done in normal DDR configuration.
* Do not set DDR_SDRAM_CFG[MEM_EN].
*
* 2. Set reserved bit EEBACR[3] at offset 0x1000
*/
ecm->eebacr |= 0x10000000;
/*
* 3. Before DDR_SDRAM_CFG[MEM_EN] is set, write DDR_SDRAM_CFG_2[D_INIT]
*
* DDR_SDRAM_CFG_2:
* FRC_SR: normal mode
* SR_IE: no self-refresh interrupt
* DLL_RST_DIS: don't care, leave at reset value
* DQS_CFG: differential DQS signals
* ODT_CFG: assert ODT to internal IOs only during reads to DRAM
* LVWx_CFG: don't care, leave at reset value
* NUM_PR: 1 refresh will be issued at a time
* DM_CFG: don't care, leave at reset value
* D_INIT: enable data initialization
*/
ddr->sdram_cfg_2 |= 0x00000010;
/*
* 4. Before DDR_SDRAM_CFG[MEM_EN] set, write D3[21] to disable data
* training
*/
ddr->debug[2] |= 0x00000400;
/*
* 5. Wait 200 micro-seconds
*/
udelay (200);
/*
* 6. Set DDR_SDRAM_CFG[MEM_EN]
*
* BTW, initialize DDR_SDRAM_CFG:
* MEM_EN: enabled
* SREN: don't care, leave at reset value
* ECC_EN: no error report
* RD_EN: no registered DIMMs
* SDRAM_TYPE: DDR2
* DYN_PWR: no power management
* 32_BE: don't care, leave at reset value
* 8_BE: 4 beat burst
* NCAP: don't care, leave at reset value
* 2T_EN: 1T Timing
* BA_INTLV_CTL: no interleaving
* x32_EN: x16 organization
* PCHB8: MA[10] for auto-precharge
* HSE: half strength for single and 2-layer stacks
* (full strength for 3- and 4-layer stacks not
* yet considered)
* MEM_HALT: no halt
* BI: automatic initialization
*/
ddr->sdram_cfg = 0x83000008;
/*
* 7. Poll DDR_SDRAM_CFG_2[D_INIT] until it is cleared by hardware
*/
asm ("sync;isync;msync");
while (ddr->sdram_cfg_2 & 0x00000010)
asm ("eieio");
/*
* 8. Clear D3[21] to re-enable data training
*/
ddr->debug[2] &= ~0x00000400;
/*
* 9. Set D2(21) to force data training to run
*/
ddr->debug[1] |= 0x00000400;
/*
* 10. Poll on D2[21] until it is cleared by hardware
*/
asm ("sync;isync;msync");
while (ddr->debug[1] & 0x00000400)
asm ("eieio");
/*
* 11. Clear reserved bit EEBACR[3] at offset 0x1000
*/
ecm->eebacr &= ~0x10000000;
#else /* !(CONFIG_TQM8548_AG || CONFIG_TQM8548_BE) */
/* DDR SDRAM CLK CNTL
* MEM_EN: enabled
* SREN: don't care, leave at reset value
* ECC_EN: no error report
* RD_EN: no register DIMMs
* SDRAM_TYPE: DDR2
* DYN_PWR: no power management
* 32_BE: don't care, leave at reset value
* 8_BE: 4 beat burst
* NCAP: don't care, leave at reset value
* 2T_EN: 1T Timing
* BA_INTLV_CTL: no interleaving
* x32_EN: x16 organization
* PCHB8: MA[10] for auto-precharge
* HSE: half strength for single and 2-layer stacks
* (full strength for 3- and 4-layer stacks no yet considered)
* MEM_HALT: no halt
* BI: automatic initialization
*/
ddr->sdram_cfg = 0x83000008;
#endif /* CONFIG_TQM8548_AG || CONFIG_TQM8548_BE */
asm ("sync; isync; msync");
udelay (1000);
#else /* !CONFIG_TQM8548 */
switch (casl) {
case 20:
cfg_ddr_timing1 = 0x47405331 | (3 << 16);
cfg_ddr_mode = 0x40020002 | (2 << 4);
break;
case 25:
cfg_ddr_timing1 = 0x47405331 | (4 << 16);
cfg_ddr_mode = 0x40020002 | (6 << 4);
break;
case 30:
default:
cfg_ddr_timing1 = 0x47405331 | (5 << 16);
cfg_ddr_mode = 0x40020002 | (3 << 4);
break;
}
ddr->cs0_bnds = (ddr_cs_conf[0].size - 1) >> 24;
ddr->cs0_config = ddr_cs_conf[0].reg;
ddr->timing_cfg_1 = cfg_ddr_timing1;
ddr->timing_cfg_2 = 0x00000800; /* P9-45,may need tuning */
ddr->sdram_mode = cfg_ddr_mode;
ddr->sdram_interval = 0x05160100; /* autocharge,no open page */
ddr->err_disable = 0x0000000D;
asm ("sync; isync; msync");
udelay (1000);
ddr->sdram_cfg = 0xc2000000; /* unbuffered,no DYN_PWR */
asm ("sync; isync; msync");
udelay (1000);
#endif /* CONFIG_TQM8548 */
/*
* get_ram_size() depends on having tlbs for the DDR, but they are
* not yet setup because we don't know the size. Set up a temp
* mapping and delete it when done.
*/
setup_ddr_tlbs(CONFIG_SYS_DDR_EARLY_SIZE_MB);
for (i = 0; i < N_DDR_CS_CONF; i++) {
ddr->cs0_config = ddr_cs_conf[i].reg;
if (get_ram_size (0, ddr_cs_conf[i].size) ==
ddr_cs_conf[i].size) {
/*
* size detected -> set Chip Select Bounds Register
*/
ddr->cs0_bnds = (ddr_cs_conf[i].size - 1) >> 24;
break;
}
}
clear_ddr_tlbs(CONFIG_SYS_DDR_EARLY_SIZE_MB);
#ifdef CONFIG_TQM8548
if (i < N_DDR_CS_CONF) {
/* Adjust refresh rate for DDR2 */
ddr->timing_cfg_3 = ddr_cs_conf[i].refresh & 0x00070000;
ddr->timing_cfg_1 = (ddr->timing_cfg_1 & 0xFFFF0FFF) |
(ddr_cs_conf[i].refresh & 0x0000F000);
return ddr_cs_conf[i].size;
}
#endif /* CONFIG_TQM8548 */
/* return size if detected, else return 0 */
return (i < N_DDR_CS_CONF) ? ddr_cs_conf[i].size : 0;
}
#if defined(CONFIG_SYS_DRAM_TEST)
int testdram (void)
{
uint *pstart = (uint *) CONFIG_SYS_MEMTEST_START;
uint *pend = (uint *) CONFIG_SYS_MEMTEST_END;
uint *p;
printf ("SDRAM test phase 1:\n");
for (p = pstart; p < pend; p++)
*p = 0xaaaaaaaa;
for (p = pstart; p < pend; p++) {
if (*p != 0xaaaaaaaa) {
printf ("SDRAM test fails at: %08x\n", (uint) p);
return 1;
}
}
printf ("SDRAM test phase 2:\n");
for (p = pstart; p < pend; p++)
*p = 0x55555555;
for (p = pstart; p < pend; p++) {
if (*p != 0x55555555) {
printf ("SDRAM test fails at: %08x\n", (uint) p);
return 1;
}
}
printf ("SDRAM test passed.\n");
return 0;
}
#endif