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u-boot/cpu/ppc4xx/sdram.c
Stefan Roese d1c3b27525 ppc4xx: Big cleanup of PPC4xx defines 
This patch cleans up multiple issues of the 4xx register (mostly
DCR, SDR, CPR, etc) definitions:

- Change lower case defines to upper case (plb4_acr -> PLB4_ACR)
- Change the defines to better match the names from the
  user's manuals (e.g. cprpllc -> CPR0_PLLC)
- Removal of some unused defines

Please test this patch intensive on your PPC4xx platform. Even though
I tried not to break anything and tested successfully on multiple
4xx AMCC platforms, testing on custom platforms is recommended.

Signed-off-by: Stefan Roese <sr@denx.de>
2009-09-11 10:35:58 +02:00

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/*
* (C) Copyright 2005-2007
* Stefan Roese, DENX Software Engineering, sr@denx.de.
*
* (C) Copyright 2006
* DAVE Srl <www.dave-tech.it>
*
* (C) Copyright 2002-2004
* Stefan Roese, esd gmbh germany, stefan.roese@esd-electronics.com
*
* 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 <ppc4xx.h>
#include <asm/processor.h>
#include "sdram.h"
#include "ecc.h"
#ifdef CONFIG_SDRAM_BANK0
#ifndef CONFIG_440
#ifndef CONFIG_SYS_SDRAM_TABLE
sdram_conf_t mb0cf[] = {
{(128 << 20), 13, 0x000A4001}, /* (0-128MB) Address Mode 3, 13x10(4) */
{(64 << 20), 13, 0x00084001}, /* (0-64MB) Address Mode 3, 13x9(4) */
{(32 << 20), 12, 0x00062001}, /* (0-32MB) Address Mode 2, 12x9(4) */
{(16 << 20), 12, 0x00046001}, /* (0-16MB) Address Mode 4, 12x8(4) */
{(4 << 20), 11, 0x00008001}, /* (0-4MB) Address Mode 5, 11x8(2) */
};
#else
sdram_conf_t mb0cf[] = CONFIG_SYS_SDRAM_TABLE;
#endif
#define N_MB0CF (sizeof(mb0cf) / sizeof(mb0cf[0]))
#ifdef CONFIG_SYS_SDRAM_CASL
static ulong ns2clks(ulong ns)
{
ulong bus_period_x_10 = ONE_BILLION / (get_bus_freq(0) / 10);
return ((ns * 10) + bus_period_x_10) / bus_period_x_10;
}
#endif /* CONFIG_SYS_SDRAM_CASL */
static ulong compute_sdtr1(ulong speed)
{
#ifdef CONFIG_SYS_SDRAM_CASL
ulong tmp;
ulong sdtr1 = 0;
/* CASL */
if (CONFIG_SYS_SDRAM_CASL < 2)
sdtr1 |= (1 << SDRAM0_TR_CASL);
else
if (CONFIG_SYS_SDRAM_CASL > 4)
sdtr1 |= (3 << SDRAM0_TR_CASL);
else
sdtr1 |= ((CONFIG_SYS_SDRAM_CASL-1) << SDRAM0_TR_CASL);
/* PTA */
tmp = ns2clks(CONFIG_SYS_SDRAM_PTA);
if ((tmp >= 2) && (tmp <= 4))
sdtr1 |= ((tmp-1) << SDRAM0_TR_PTA);
else
sdtr1 |= ((4-1) << SDRAM0_TR_PTA);
/* CTP */
tmp = ns2clks(CONFIG_SYS_SDRAM_CTP);
if ((tmp >= 2) && (tmp <= 4))
sdtr1 |= ((tmp-1) << SDRAM0_TR_CTP);
else
sdtr1 |= ((4-1) << SDRAM0_TR_CTP);
/* LDF */
tmp = ns2clks(CONFIG_SYS_SDRAM_LDF);
if ((tmp >= 2) && (tmp <= 4))
sdtr1 |= ((tmp-1) << SDRAM0_TR_LDF);
else
sdtr1 |= ((2-1) << SDRAM0_TR_LDF);
/* RFTA */
tmp = ns2clks(CONFIG_SYS_SDRAM_RFTA);
if ((tmp >= 4) && (tmp <= 10))
sdtr1 |= ((tmp-4) << SDRAM0_TR_RFTA);
else
sdtr1 |= ((10-4) << SDRAM0_TR_RFTA);
/* RCD */
tmp = ns2clks(CONFIG_SYS_SDRAM_RCD);
if ((tmp >= 2) && (tmp <= 4))
sdtr1 |= ((tmp-1) << SDRAM0_TR_RCD);
else
sdtr1 |= ((4-1) << SDRAM0_TR_RCD);
return sdtr1;
#else /* CONFIG_SYS_SDRAM_CASL */
/*
* If no values are configured in the board config file
* use the default values, which seem to be ok for most
* boards.
*
* REMARK:
* For new board ports we strongly recommend to define the
* correct values for the used SDRAM chips in your board
* config file (see PPChameleonEVB.h)
*/
if (speed > 100000000) {
/*
* 133 MHz SDRAM
*/
return 0x01074015;
} else {
/*
* default: 100 MHz SDRAM
*/
return 0x0086400d;
}
#endif /* CONFIG_SYS_SDRAM_CASL */
}
/* refresh is expressed in ms */
static ulong compute_rtr(ulong speed, ulong rows, ulong refresh)
{
#ifdef CONFIG_SYS_SDRAM_CASL
ulong tmp;
tmp = ((refresh*1000*1000) / (1 << rows)) * (speed / 1000);
tmp /= 1000000;
return ((tmp & 0x00003FF8) << 16);
#else /* CONFIG_SYS_SDRAM_CASL */
if (speed > 100000000) {
/*
* 133 MHz SDRAM
*/
return 0x07f00000;
} else {
/*
* default: 100 MHz SDRAM
*/
return 0x05f00000;
}
#endif /* CONFIG_SYS_SDRAM_CASL */
}
/*
* Autodetect onboard SDRAM on 405 platforms
*/
phys_size_t initdram(int board_type)
{
ulong speed;
ulong sdtr1;
int i;
/*
* Determine SDRAM speed
*/
speed = get_bus_freq(0); /* parameter not used on ppc4xx */
/*
* sdtr1 (register SDRAM0_TR) must take into account timings listed
* in SDRAM chip datasheet. rtr (register SDRAM0_RTR) must take into
* account actual SDRAM size. So we can set up sdtr1 according to what
* is specified in board configuration file while rtr dependds on SDRAM
* size we are assuming before detection.
*/
sdtr1 = compute_sdtr1(speed);
for (i=0; i<N_MB0CF; i++) {
/*
* Disable memory controller.
*/
mtsdram(mem_mcopt1, 0x00000000);
/*
* Set MB0CF for bank 0.
*/
mtsdram(mem_mb0cf, mb0cf[i].reg);
mtsdram(mem_sdtr1, sdtr1);
mtsdram(mem_rtr, compute_rtr(speed, mb0cf[i].rows, 64));
udelay(200);
/*
* Set memory controller options reg, MCOPT1.
* Set DC_EN to '1' and BRD_PRF to '01' for 16 byte PLB Burst
* read/prefetch.
*/
mtsdram(mem_mcopt1, 0x80800000);
udelay(10000);
if (get_ram_size(0, mb0cf[i].size) == mb0cf[i].size) {
phys_size_t size = mb0cf[i].size;
/*
* OK, size detected. Enable second bank if
* defined (assumes same type as bank 0)
*/
#ifdef CONFIG_SDRAM_BANK1
mtsdram(mem_mcopt1, 0x00000000);
mtsdram(mem_mb1cf, mb0cf[i].size | mb0cf[i].reg);
mtsdram(mem_mcopt1, 0x80800000);
udelay(10000);
/*
* Check if 2nd bank is really available.
* If the size not equal to the size of the first
* bank, then disable the 2nd bank completely.
*/
if (get_ram_size((long *)mb0cf[i].size, mb0cf[i].size) !=
mb0cf[i].size) {
mtsdram(mem_mb1cf, 0);
mtsdram(mem_mcopt1, 0);
} else {
/*
* We have two identical banks, so the size
* is twice the bank size
*/
size = 2 * size;
}
#endif
/*
* OK, size detected -> all done
*/
return size;
}
}
return 0;
}
#else /* CONFIG_440 */
/*
* Define some default values. Those can be overwritten in the
* board config file.
*/
#ifndef CONFIG_SYS_SDRAM_TABLE
sdram_conf_t mb0cf[] = {
{(256 << 20), 13, 0x000C4001}, /* 256MB mode 3, 13x10(4) */
{(128 << 20), 13, 0x000A4001}, /* 128MB mode 3, 13x10(4) */
{(64 << 20), 12, 0x00082001} /* 64MB mode 2, 12x9(4) */
};
#else
sdram_conf_t mb0cf[] = CONFIG_SYS_SDRAM_TABLE;
#endif
#ifndef CONFIG_SYS_SDRAM0_TR0
#define CONFIG_SYS_SDRAM0_TR0 0x41094012
#endif
#ifndef CONFIG_SYS_SDRAM0_WDDCTR
#define CONFIG_SYS_SDRAM0_WDDCTR 0x00000000 /* wrcp=0 dcd=0 */
#endif
#ifndef CONFIG_SYS_SDRAM0_RTR
#define CONFIG_SYS_SDRAM0_RTR 0x04100000 /* 7.8us @ 133MHz PLB */
#endif
#ifndef CONFIG_SYS_SDRAM0_CFG0
#define CONFIG_SYS_SDRAM0_CFG0 0x82000000 /* DCEN=1, PMUD=0, 64-bit */
#endif
#define N_MB0CF (sizeof(mb0cf) / sizeof(mb0cf[0]))
#define NUM_TRIES 64
#define NUM_READS 10
static void sdram_tr1_set(int ram_address, int* tr1_value)
{
int i;
int j, k;
volatile unsigned int* ram_pointer = (unsigned int *)ram_address;
int first_good = -1, last_bad = 0x1ff;
unsigned long test[NUM_TRIES] = {
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 };
/* go through all possible SDRAM0_TR1[RDCT] values */
for (i=0; i<=0x1ff; i++) {
/* set the current value for TR1 */
mtsdram(mem_tr1, (0x80800800 | i));
/* write values */
for (j=0; j<NUM_TRIES; j++) {
ram_pointer[j] = test[j];
/* clear any cache at ram location */
__asm__("dcbf 0,%0": :"r" (&ram_pointer[j]));
}
/* read values back */
for (j=0; j<NUM_TRIES; j++) {
for (k=0; k<NUM_READS; k++) {
/* clear any cache at ram location */
__asm__("dcbf 0,%0": :"r" (&ram_pointer[j]));
if (ram_pointer[j] != test[j])
break;
}
/* read error */
if (k != NUM_READS)
break;
}
/* we have a SDRAM0_TR1[RDCT] that is part of the window */
if (j == NUM_TRIES) {
if (first_good == -1)
first_good = i; /* found beginning of window */
} else { /* bad read */
/* if we have not had a good read then don't care */
if (first_good != -1) {
/* first failure after a good read */
last_bad = i-1;
break;
}
}
}
/* return the current value for TR1 */
*tr1_value = (first_good + last_bad) / 2;
}
/*
* Autodetect onboard DDR SDRAM on 440 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 initdram(int board_type)
{
int i;
int tr1_bank1;
#if defined(CONFIG_440GX) || defined(CONFIG_440EP) || \
defined(CONFIG_440GR) || defined(CONFIG_440SP)
/*
* Soft-reset SDRAM controller.
*/
mtsdr(SDR0_SRST, SDR0_SRST_DMC);
mtsdr(SDR0_SRST, 0x00000000);
#endif
for (i=0; i<N_MB0CF; i++) {
/*
* Disable memory controller.
*/
mtsdram(mem_cfg0, 0x00000000);
/*
* Setup some default
*/
mtsdram(mem_uabba, 0x00000000); /* ubba=0 (default) */
mtsdram(mem_slio, 0x00000000); /* rdre=0 wrre=0 rarw=0 */
mtsdram(mem_devopt, 0x00000000); /* dll=0 ds=0 (normal) */
mtsdram(mem_wddctr, CONFIG_SYS_SDRAM0_WDDCTR);
mtsdram(mem_clktr, 0x40000000); /* clkp=1 (90 deg wr) dcdt=0 */
/*
* Following for CAS Latency = 2.5 @ 133 MHz PLB
*/
mtsdram(mem_b0cr, mb0cf[i].reg);
mtsdram(mem_tr0, CONFIG_SYS_SDRAM0_TR0);
mtsdram(mem_tr1, 0x80800800); /* SS=T2 SL=STAGE 3 CD=1 CT=0x00*/
mtsdram(mem_rtr, CONFIG_SYS_SDRAM0_RTR);
mtsdram(mem_cfg1, 0x00000000); /* Self-refresh exit, disable PM*/
udelay(400); /* Delay 200 usecs (min) */
/*
* Enable the controller, then wait for DCEN to complete
*/
mtsdram(mem_cfg0, CONFIG_SYS_SDRAM0_CFG0);
udelay(10000);
if (get_ram_size(0, mb0cf[i].size) == mb0cf[i].size) {
phys_size_t size = mb0cf[i].size;
/*
* Optimize TR1 to current hardware environment
*/
sdram_tr1_set(0x00000000, &tr1_bank1);
mtsdram(mem_tr1, (tr1_bank1 | 0x80800800));
/*
* OK, size detected. Enable second bank if
* defined (assumes same type as bank 0)
*/
#ifdef CONFIG_SDRAM_BANK1
mtsdram(mem_cfg0, 0);
mtsdram(mem_b1cr, mb0cf[i].size | mb0cf[i].reg);
mtsdram(mem_cfg0, CONFIG_SYS_SDRAM0_CFG0);
udelay(10000);
/*
* Check if 2nd bank is really available.
* If the size not equal to the size of the first
* bank, then disable the 2nd bank completely.
*/
if (get_ram_size((long *)mb0cf[i].size, mb0cf[i].size)
!= mb0cf[i].size) {
mtsdram(mem_cfg0, 0);
mtsdram(mem_b1cr, 0);
mtsdram(mem_cfg0, CONFIG_SYS_SDRAM0_CFG0);
udelay(10000);
} else {
/*
* We have two identical banks, so the size
* is twice the bank size
*/
size = 2 * size;
}
#endif
#ifdef CONFIG_SDRAM_ECC
ecc_init(0, size);
#endif
/*
* OK, size detected -> all done
*/
return size;
}
}
return 0; /* nothing found ! */
}
#endif /* CONFIG_440 */
#endif /* CONFIG_SDRAM_BANK0 */
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