diff options
Diffstat (limited to 'board/pcippc2/cpc710_init_ram.c')
| -rw-r--r-- | board/pcippc2/cpc710_init_ram.c | 254 |
1 files changed, 254 insertions, 0 deletions
diff --git a/board/pcippc2/cpc710_init_ram.c b/board/pcippc2/cpc710_init_ram.c new file mode 100644 index 0000000..57ed8f0 --- /dev/null +++ b/board/pcippc2/cpc710_init_ram.c @@ -0,0 +1,254 @@ +/* + * (C) Copyright 2002 + * Wolfgang Denk, DENX Software Engineering, wd@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 <config.h> +#include <common.h> +#include <asm/io.h> + +#include "pcippc2.h" +#include "i2c.h" + +typedef struct cpc710_mem_org_s +{ + u8 rows; + u8 cols; + u8 banks2; + u8 org; +} cpc710_mem_org_t; + +static int cpc710_compute_mcer (u32 * mcer, + unsigned long * + size, + unsigned int sdram); +static int cpc710_eeprom_checksum (unsigned int sdram); +static u8 cpc710_eeprom_read (unsigned int sdram, + unsigned int offset); + +static u32 cpc710_mcer_mem [] = +{ + 0x000003f3, /* 18 lines, 4 Mb */ + 0x000003e3, /* 19 lines, 8 Mb */ + 0x000003c3, /* 20 lines, 16 Mb */ + 0x00000383, /* 21 lines, 32 Mb */ + 0x00000303, /* 22 lines, 64 Mb */ + 0x00000203, /* 23 lines, 128 Mb */ + 0x00000003, /* 24 lines, 256 Mb */ + 0x00000002, /* 25 lines, 512 Mb */ + 0x00000001 /* 26 lines, 1024 Mb */ +}; +static cpc710_mem_org_t cpc710_mem_org [] = +{ + { 0x0c, 0x09, 0x02, 0x00 }, /* 0000: 12/ 9/2 */ + { 0x0d, 0x09, 0x02, 0x00 }, /* 0000: 13/ 9/2 */ + { 0x0d, 0x0a, 0x02, 0x00 }, /* 0000: 13/10/2 */ + { 0x0d, 0x0b, 0x02, 0x00 }, /* 0000: 13/11/2 */ + { 0x0d, 0x0c, 0x02, 0x00 }, /* 0000: 13/12/2 */ + { 0x0e, 0x0c, 0x02, 0x00 }, /* 0000: 14/12/2 */ + { 0x0b, 0x08, 0x02, 0x01 }, /* 0001: 11/ 8/2 */ + { 0x0b, 0x09, 0x01, 0x02 }, /* 0010: 11/ 9/1 */ + { 0x0b, 0x0a, 0x01, 0x03 }, /* 0011: 11/10/1 */ + { 0x0c, 0x08, 0x02, 0x04 }, /* 0100: 12/ 8/2 */ + { 0x0c, 0x0a, 0x02, 0x05 }, /* 0101: 12/10/2 */ + { 0x0d, 0x08, 0x01, 0x06 }, /* 0110: 13/ 8/1 */ + { 0x0d, 0x08, 0x02, 0x07 }, /* 0111: 13/ 8/2 */ + { 0x0d, 0x09, 0x01, 0x08 }, /* 1000: 13/ 9/1 */ + { 0x0d, 0x0a, 0x01, 0x09 }, /* 1001: 13/10/1 */ + { 0x0b, 0x08, 0x01, 0x0a }, /* 1010: 11/ 8/1 */ + { 0x0c, 0x08, 0x01, 0x0b }, /* 1011: 12/ 8/1 */ + { 0x0c, 0x09, 0x01, 0x0c }, /* 1100: 12/ 9/1 */ + { 0x0e, 0x09, 0x02, 0x0d }, /* 1101: 14/ 9/2 */ + { 0x0e, 0x0a, 0x02, 0x0e }, /* 1110: 14/10/2 */ + { 0x0e, 0x0b, 0x02, 0x0f } /* 1111: 14/11/2 */ +}; + +unsigned long cpc710_ram_init (void) +{ + unsigned long memsize = 0; + unsigned long bank_size; + u32 mcer; + +#ifndef CFG_RAMBOOT + /* Clear memory banks + */ + out32(REG(SDRAM0, MCER0), 0); + out32(REG(SDRAM0, MCER1), 0); + out32(REG(SDRAM0, MCER2), 0); + out32(REG(SDRAM0, MCER3), 0); + out32(REG(SDRAM0, MCER4), 0); + out32(REG(SDRAM0, MCER5), 0); + out32(REG(SDRAM0, MCER6), 0); + out32(REG(SDRAM0, MCER7), 0); + iobarrier_rw(); + + /* Disable memory + */ + out32(REG(SDRAM0,MCCR), 0x13b06000); + iobarrier_rw(); +#endif + + /* Only the first memory bank is initialised now + */ + if (! cpc710_compute_mcer(& mcer, & bank_size, 0)) + { + puts("Unsupported SDRAM type !\n"); + hang(); + } + memsize += bank_size; +#ifndef CFG_RAMBOOT + /* Enable bank, zero start + */ + out32(REG(SDRAM0, MCER0), mcer | 0x80000000); + iobarrier_rw(); +#endif + +#ifndef CFG_RAMBOOT + /* Enable memory + */ + out32(REG(SDRAM0, MCCR), in32(REG(SDRAM0, MCCR)) | 0x80000000); + + /* Wait until initialisation finished + */ + while (! (in32 (REG(SDRAM0, MCCR)) & 0x20000000)) + { + iobarrier_rw(); + } + + /* Clear Memory Error Status and Address registers + */ + out32(REG(SDRAM0, MESR), 0); + out32(REG(SDRAM0, MEAR), 0); + iobarrier_rw(); + + /* ECC is not configured now + */ +#endif + + /* Memory size counter + */ + out32(REG(CPC0, RGBAN1), memsize); + + return memsize; +} + +static int cpc710_compute_mcer ( + u32 * mcer, + unsigned long * size, + unsigned int sdram) +{ + u8 rows; + u8 cols; + u8 banks2; + unsigned int lines; + u32 mc = 0; + unsigned int i; + cpc710_mem_org_t * org = 0; + + + if (! i2c_reset()) + { + puts("Can't reset I2C!\n"); + hang(); + } + + if (! cpc710_eeprom_checksum(sdram)) + { + puts("Invalid EEPROM checksum !\n"); + hang(); + } + + rows = cpc710_eeprom_read(sdram, 3); + cols = cpc710_eeprom_read(sdram, 4); + /* Can be 2 or 4 banks; divide by 2 + */ + banks2 = cpc710_eeprom_read(sdram, 17) / 2; + + lines = rows + cols + banks2; + + if (lines < 18 || lines > 26) + { + /* Unsupported configuration + */ + return 0; + } + + + mc |= cpc710_mcer_mem [lines - 18] << 6; + + for (i = 0; i < sizeof(cpc710_mem_org) / sizeof(cpc710_mem_org_t); i++) + { + cpc710_mem_org_t * corg = cpc710_mem_org + i; + + if (corg->rows == rows && corg->cols == cols && corg->banks2 == banks2) + { + org = corg; + + break; + } + } + + if (! org) + { + /* Unsupported configuration + */ + return 0; + } + + mc |= (u32) org->org << 2; + + /* Supported configuration + */ + *mcer = mc; + *size = 1l << (lines + 4); + + return 1; +} + +static int cpc710_eeprom_checksum ( + unsigned int sdram) +{ + u8 sum = 0; + unsigned int i; + + for (i = 0; i < 63; i++) + { + sum += cpc710_eeprom_read(sdram, i); + } + + return sum == cpc710_eeprom_read(sdram, 63); +} + +static u8 cpc710_eeprom_read ( + unsigned int sdram, + unsigned int offset) +{ + u8 dev = (sdram << 1) | 0xa0; + u8 data; + + if (! i2c_read_byte(& data, dev,offset)) + { + puts("I2C error !\n"); + hang(); + } + + return data; +} |