diff options
Diffstat (limited to 'src/cpu')
| -rw-r--r-- | src/cpu/ppc/ppc4xx/sdram.c | 291 |
1 files changed, 291 insertions, 0 deletions
diff --git a/src/cpu/ppc/ppc4xx/sdram.c b/src/cpu/ppc/ppc4xx/sdram.c new file mode 100644 index 0000000000..c4395e7885 --- /dev/null +++ b/src/cpu/ppc/ppc4xx/sdram.c @@ -0,0 +1,291 @@ +/* + * (C) Copyright 2002 + * 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 <ppc_asm.tmpl> +#include <ppc.h> +#include <ppc4xx.h> + +#define CONFIG_SDRAM_BANK0 +#ifdef CONFIG_SDRAM_BANK0 + + +#define MAGIC0 0x00000000 +#define MAGIC1 0x11111111 +#define MAGIC2 0x22222222 +#define MAGIC3 0x33333333 +#define MAGIC4 0x44444444 +#define MAGIC5 0x55555555 +#define MAGIC6 0x66666666 + +#define ADDR_ZERO 0x00000000 +#define ADDR_400 0x00000400 +#define ADDR_01MB 0x00100000 +#define ADDR_08MB 0x00800000 +#define ADDR_16MB 0x01000000 +#define ADDR_32MB 0x02000000 +#define ADDR_64MB 0x04000000 +#define ADDR_128MB 0x08000000 + +#define mtsdram0(reg, data) mtdcr(memcfga,reg);mtdcr(memcfgd,data) + + +/*----------------------------------------------------------------------- + */ +void sdram_init(void) +{ + unsigned long speed; + unsigned long sdtr1; + unsigned long rtr; + + /* + * Determine SDRAM speed + */ + speed = get_bus_freq(0); /* parameter not used on ppc4xx */ + + /* + * Support for 100MHz and 133MHz SDRAM + */ + if (speed > 100000000) { + /* + * 133 MHz SDRAM + */ + sdtr1 = 0x01074015; + rtr = 0x07f00000; + } else { + /* + * default: 100 MHz SDRAM + */ + sdtr1 = 0x0086400d; + rtr = 0x05f00000; + } + + /* + * Set MB0CF for bank 0. (0-128MB) Address Mode 3 since 13x10(4) + */ + mtsdram0(mem_mb0cf, 0x000A4001); + + mtsdram0(mem_sdtr1, sdtr1); + mtsdram0(mem_rtr, rtr); + + /* + * Wait for 200us + */ + 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. + */ + mtsdram0(mem_mcopt1, 0x80800000); + + /* + * Wait for 10ms + */ + udelay(10000); + + /* + * Test if 128 MByte are equipped (mirror test) + */ + *(volatile unsigned long *)ADDR_ZERO = MAGIC0; + *(volatile unsigned long *)ADDR_08MB = MAGIC1; + *(volatile unsigned long *)ADDR_16MB = MAGIC2; + *(volatile unsigned long *)ADDR_32MB = MAGIC3; + *(volatile unsigned long *)ADDR_64MB = MAGIC4; + + if ((*(volatile unsigned long *)ADDR_ZERO == MAGIC0) && + (*(volatile unsigned long *)ADDR_08MB == MAGIC1) && + (*(volatile unsigned long *)ADDR_16MB == MAGIC2) && + (*(volatile unsigned long *)ADDR_32MB == MAGIC3)) { + /* + * OK, 128MB detected -> all done + */ + return; + } + + /* + * Now test for 64 MByte... + */ + + /* + * Disable memory controller. + */ + mtsdram0(mem_mcopt1, 0x00000000); + + /* + * Set MB0CF for bank 0. (0-64MB) Address Mode 3 since 13x9(4) + */ + mtsdram0(mem_mb0cf, 0x00084001); + + mtsdram0(mem_sdtr1, sdtr1); + mtsdram0(mem_rtr, rtr); + + /* + * Wait for 200us + */ + 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. + */ + mtsdram0(mem_mcopt1, 0x80800000); + + /* + * Wait for 10ms + */ + udelay(10000); + + /* + * Test if 64 MByte are equipped (mirror test) + */ + *(volatile unsigned long *)ADDR_ZERO = MAGIC0; + *(volatile unsigned long *)ADDR_08MB = MAGIC1; + *(volatile unsigned long *)ADDR_16MB = MAGIC2; + *(volatile unsigned long *)ADDR_32MB = MAGIC3; + + if ((*(volatile unsigned long *)ADDR_ZERO == MAGIC0) && + (*(volatile unsigned long *)ADDR_08MB == MAGIC1) && + (*(volatile unsigned long *)ADDR_16MB == MAGIC2)) { + /* + * OK, 64MB detected -> all done + */ + return; + } + + /* + * Now test for 32 MByte... + */ + + /* + * Disable memory controller. + */ + mtsdram0(mem_mcopt1, 0x00000000); + + /* + * Set MB0CF for bank 0. (0-32MB) Address Mode 2 since 12x9(4) + */ + mtsdram0(mem_mb0cf, 0x00062001); + + /* + * Set memory controller options reg, MCOPT1. + * Set DC_EN to '1' and BRD_PRF to '01' for 16 byte PLB Burst + * read/prefetch. + */ + mtsdram0(mem_mcopt1, 0x80800000); + + /* + * Wait for 10ms + */ + udelay(10000); + + /* + * Test if 32 MByte are equipped (mirror test) + */ + *(volatile unsigned long *)ADDR_ZERO = MAGIC0; + *(volatile unsigned long *)ADDR_400 = MAGIC1; + *(volatile unsigned long *)ADDR_08MB = MAGIC2; + *(volatile unsigned long *)ADDR_16MB = MAGIC3; + + if ((*(volatile unsigned long *)ADDR_ZERO == MAGIC0) && + (*(volatile unsigned long *)ADDR_400 == MAGIC1) && + (*(volatile unsigned long *)ADDR_08MB == MAGIC2)) { + /* + * OK, 32MB detected -> all done + */ + return; + } + + /* + * Now test for 16 MByte... + */ + /* + * Disable memory controller. + */ + mtsdram0(mem_mcopt1, 0x00000000); + + /* + * Set MB0CF for bank 0. (0-16MB) Address Mode 4 since 12x8(4) + */ + mtsdram0(mem_mb0cf, 0x00046001); + + /* + * Set memory controller options reg, MCOPT1. + * Set DC_EN to '1' and BRD_PRF to '01' for 16 byte PLB Burst + * read/prefetch. + */ + mtsdram0(mem_mcopt1, 0x80800000); + + /* + * Wait for 10ms + */ + udelay(10000); + + /* + * Test if 16 MByte are equipped (mirror test) + */ + *(volatile unsigned long *)ADDR_ZERO = MAGIC0; + *(volatile unsigned long *)ADDR_400 = MAGIC1; + *(volatile unsigned long *)ADDR_01MB = MAGIC5; + *(volatile unsigned long *)ADDR_08MB = MAGIC2; +/* *(volatile unsigned long *)ADDR_16MB = MAGIC3;*/ + + if ((*(volatile unsigned long *)ADDR_ZERO == MAGIC0) && + (*(volatile unsigned long *)ADDR_400 == MAGIC1) && + (*(volatile unsigned long *)ADDR_01MB == MAGIC5) && + (*(volatile unsigned long *)ADDR_08MB == MAGIC2)) { + /* + * OK, 16MB detected -> all done + */ + return; + } + + /* + * Setup for 4 MByte... + */ + + /* + * Disable memory controller. + */ + mtsdram0(mem_mcopt1, 0x00000000); + + /* + * Set MB0CF for bank 0. (0-4MB) Address Mode 5 since 11x8(2) + */ + mtsdram0(mem_mb0cf, 0x00008001); + + /* + * Set memory controller options reg, MCOPT1. + * Set DC_EN to '1' and BRD_PRF to '01' for 16 byte PLB Burst + * read/prefetch. + */ + mtsdram0(mem_mcopt1, 0x80800000); + + /* + * Wait for 10ms + */ + udelay(10000); +} + +#endif /* CONFIG_SDRAM_BANK0 */ |