diff options
Diffstat (limited to 'cpu/ppc4xx/40x_spd_sdram.c')
-rw-r--r-- | cpu/ppc4xx/40x_spd_sdram.c | 464 |
1 files changed, 0 insertions, 464 deletions
diff --git a/cpu/ppc4xx/40x_spd_sdram.c b/cpu/ppc4xx/40x_spd_sdram.c deleted file mode 100644 index 5e6dbe3..0000000 --- a/cpu/ppc4xx/40x_spd_sdram.c +++ /dev/null @@ -1,464 +0,0 @@ -/* - * cpu/ppc4xx/40x_spd_sdram.c - * This SPD SDRAM detection code supports IBM/AMCC PPC44x cpu with a - * SDRAM controller. Those are all current 405 PPC's. - * - * (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 - * 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 <i2c.h> -#include <ppc4xx.h> - -#if defined(CONFIG_SPD_EEPROM) && !defined(CONFIG_440) - -/* - * Set default values - */ -#ifndef CONFIG_SYS_I2C_SPEED -#define CONFIG_SYS_I2C_SPEED 50000 -#endif - -#define ONE_BILLION 1000000000 - -#define SDRAM0_CFG_DCE 0x80000000 -#define SDRAM0_CFG_SRE 0x40000000 -#define SDRAM0_CFG_PME 0x20000000 -#define SDRAM0_CFG_MEMCHK 0x10000000 -#define SDRAM0_CFG_REGEN 0x08000000 -#define SDRAM0_CFG_ECCDD 0x00400000 -#define SDRAM0_CFG_EMDULR 0x00200000 -#define SDRAM0_CFG_DRW_SHIFT (31-6) -#define SDRAM0_CFG_BRPF_SHIFT (31-8) - -#define SDRAM0_TR_CASL_SHIFT (31-8) -#define SDRAM0_TR_PTA_SHIFT (31-13) -#define SDRAM0_TR_CTP_SHIFT (31-15) -#define SDRAM0_TR_LDF_SHIFT (31-17) -#define SDRAM0_TR_RFTA_SHIFT (31-29) -#define SDRAM0_TR_RCD_SHIFT (31-31) - -#define SDRAM0_RTR_SHIFT (31-15) -#define SDRAM0_ECCCFG_SHIFT (31-11) - -/* SDRAM0_CFG enable macro */ -#define SDRAM0_CFG_BRPF(x) ( ( x & 0x3)<< SDRAM0_CFG_BRPF_SHIFT ) - -#define SDRAM0_BXCR_SZ_MASK 0x000e0000 -#define SDRAM0_BXCR_AM_MASK 0x0000e000 - -#define SDRAM0_BXCR_SZ_SHIFT (31-14) -#define SDRAM0_BXCR_AM_SHIFT (31-18) - -#define SDRAM0_BXCR_SZ(x) ( (( x << SDRAM0_BXCR_SZ_SHIFT) & SDRAM0_BXCR_SZ_MASK) ) -#define SDRAM0_BXCR_AM(x) ( (( x << SDRAM0_BXCR_AM_SHIFT) & SDRAM0_BXCR_AM_MASK) ) - -#ifdef CONFIG_SPDDRAM_SILENT -# define SPD_ERR(x) do { return 0; } while (0) -#else -# define SPD_ERR(x) do { printf(x); return(0); } while (0) -#endif - -#define sdram_HZ_to_ns(hertz) (1000000000/(hertz)) - -/* function prototypes */ -int spd_read(uint addr); - - -/* - * 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. - * - * Input: null for default I2C spd functions or a pointer to a custom function - * returning spd_data. - */ - -long int spd_sdram(int(read_spd)(uint addr)) -{ - int tmp,row,col; - int total_size,bank_size,bank_code; - int ecc_on; - int mode; - int bank_cnt; - - int sdram0_pmit=0x07c00000; -#ifndef CONFIG_405EP /* not on PPC405EP */ - int sdram0_besr0 = -1; - int sdram0_besr1 = -1; - int sdram0_eccesr = -1; -#endif - int sdram0_ecccfg; - - int sdram0_rtr=0; - int sdram0_tr=0; - - int sdram0_b0cr; - int sdram0_b1cr; - int sdram0_b2cr; - int sdram0_b3cr; - - int sdram0_cfg=0; - - int t_rp; - int t_rcd; - int t_ras; - int t_rc; - int min_cas; - - PPC4xx_SYS_INFO sys_info; - unsigned long bus_period_x_10; - - /* - * get the board info - */ - get_sys_info(&sys_info); - bus_period_x_10 = ONE_BILLION / (sys_info.freqPLB / 10); - - if (read_spd == 0){ - read_spd=spd_read; - /* - * Make sure I2C controller is initialized - * before continuing. - */ - i2c_init(CONFIG_SYS_I2C_SPEED, CONFIG_SYS_I2C_SLAVE); - } - - /* Make shure we are using SDRAM */ - if (read_spd(2) != 0x04) { - SPD_ERR("SDRAM - non SDRAM memory module found\n"); - } - - /* ------------------------------------------------------------------ - * configure memory timing register - * - * data from DIMM: - * 27 IN Row Precharge Time ( t RP) - * 29 MIN RAS to CAS Delay ( t RCD) - * 127 Component and Clock Detail ,clk0-clk3, junction temp, CAS - * -------------------------------------------------------------------*/ - - /* - * first figure out which cas latency mode to use - * use the min supported mode - */ - - tmp = read_spd(127) & 0x6; - if (tmp == 0x02) { /* only cas = 2 supported */ - min_cas = 2; -/* t_ck = read_spd(9); */ -/* t_ac = read_spd(10); */ - } else if (tmp == 0x04) { /* only cas = 3 supported */ - min_cas = 3; -/* t_ck = read_spd(9); */ -/* t_ac = read_spd(10); */ - } else if (tmp == 0x06) { /* 2,3 supported, so use 2 */ - min_cas = 2; -/* t_ck = read_spd(23); */ -/* t_ac = read_spd(24); */ - } else { - SPD_ERR("SDRAM - unsupported CAS latency \n"); - } - - /* get some timing values, t_rp,t_rcd,t_ras,t_rc - */ - t_rp = read_spd(27); - t_rcd = read_spd(29); - t_ras = read_spd(30); - t_rc = t_ras + t_rp; - - /* The following timing calcs subtract 1 before deviding. - * this has effect of using ceiling instead of floor rounding, - * and also subtracting 1 to convert number to reg value - */ - /* set up CASL */ - sdram0_tr = (min_cas - 1) << SDRAM0_TR_CASL_SHIFT; - /* set up PTA */ - sdram0_tr |= ((((t_rp - 1) * 10)/bus_period_x_10) & 0x3) << SDRAM0_TR_PTA_SHIFT; - /* set up CTP */ - tmp = (((t_rc - t_rcd - t_rp -1) * 10) / bus_period_x_10) & 0x3; - if (tmp < 1) - tmp = 1; - sdram0_tr |= tmp << SDRAM0_TR_CTP_SHIFT; - /* set LDF = 2 cycles, reg value = 1 */ - sdram0_tr |= 1 << SDRAM0_TR_LDF_SHIFT; - /* set RFTA = t_rfc/bus_period, use t_rfc = t_rc */ - tmp = (((t_rc - 1) * 10) / bus_period_x_10) - 3; - if (tmp < 0) - tmp = 0; - if (tmp > 6) - tmp = 6; - sdram0_tr |= tmp << SDRAM0_TR_RFTA_SHIFT; - /* set RCD = t_rcd/bus_period*/ - sdram0_tr |= ((((t_rcd - 1) * 10) / bus_period_x_10) &0x3) << SDRAM0_TR_RCD_SHIFT ; - - - /*------------------------------------------------------------------ - * configure RTR register - * -------------------------------------------------------------------*/ - row = read_spd(3); - col = read_spd(4); - tmp = read_spd(12) & 0x7f ; /* refresh type less self refresh bit */ - switch (tmp) { - case 0x00: - tmp = 15625; - break; - case 0x01: - tmp = 15625 / 4; - break; - case 0x02: - tmp = 15625 / 2; - break; - case 0x03: - tmp = 15625 * 2; - break; - case 0x04: - tmp = 15625 * 4; - break; - case 0x05: - tmp = 15625 * 8; - break; - default: - SPD_ERR("SDRAM - Bad refresh period \n"); - } - /* convert from nsec to bus cycles */ - tmp = (tmp * 10) / bus_period_x_10; - sdram0_rtr = (tmp & 0x3ff8) << SDRAM0_RTR_SHIFT; - - /*------------------------------------------------------------------ - * determine the number of banks used - * -------------------------------------------------------------------*/ - /* byte 7:6 is module data width */ - if (read_spd(7) != 0) - SPD_ERR("SDRAM - unsupported module width\n"); - tmp = read_spd(6); - if (tmp < 32) - SPD_ERR("SDRAM - unsupported module width\n"); - else if (tmp < 64) - bank_cnt = 1; /* one bank per sdram side */ - else if (tmp < 73) - bank_cnt = 2; /* need two banks per side */ - else if (tmp < 161) - bank_cnt = 4; /* need four banks per side */ - else - SPD_ERR("SDRAM - unsupported module width\n"); - - /* byte 5 is the module row count (refered to as dimm "sides") */ - tmp = read_spd(5); - if (tmp == 1) - ; - else if (tmp==2) - bank_cnt *= 2; - else if (tmp==4) - bank_cnt *= 4; - else - bank_cnt = 8; /* 8 is an error code */ - - if (bank_cnt > 4) /* we only have 4 banks to work with */ - SPD_ERR("SDRAM - unsupported module rows for this width\n"); - - /* now check for ECC ability of module. We only support ECC - * on 32 bit wide devices with 8 bit ECC. - */ - if ((read_spd(11)==2) && (read_spd(6)==40) && (read_spd(14)==8)) { - sdram0_ecccfg = 0xf << SDRAM0_ECCCFG_SHIFT; - ecc_on = 1; - } else { - sdram0_ecccfg = 0; - ecc_on = 0; - } - - /*------------------------------------------------------------------ - * calculate total size - * -------------------------------------------------------------------*/ - /* calculate total size and do sanity check */ - tmp = read_spd(31); - total_size = 1 << 22; /* total_size = 4MB */ - /* now multiply 4M by the smallest device row density */ - /* note that we don't support asymetric rows */ - while (((tmp & 0x0001) == 0) && (tmp != 0)) { - total_size = total_size << 1; - tmp = tmp >> 1; - } - total_size *= read_spd(5); /* mult by module rows (dimm sides) */ - - /*------------------------------------------------------------------ - * map rows * cols * banks to a mode - * -------------------------------------------------------------------*/ - - switch (row) { - case 11: - switch (col) { - case 8: - mode=4; /* mode 5 */ - break; - case 9: - case 10: - mode=0; /* mode 1 */ - break; - default: - SPD_ERR("SDRAM - unsupported mode\n"); - } - break; - case 12: - switch (col) { - case 8: - mode=3; /* mode 4 */ - break; - case 9: - case 10: - mode=1; /* mode 2 */ - break; - default: - SPD_ERR("SDRAM - unsupported mode\n"); - } - break; - case 13: - switch (col) { - case 8: - mode=5; /* mode 6 */ - break; - case 9: - case 10: - if (read_spd(17) == 2) - mode = 6; /* mode 7 */ - else - mode = 2; /* mode 3 */ - break; - case 11: - mode = 2; /* mode 3 */ - break; - default: - SPD_ERR("SDRAM - unsupported mode\n"); - } - break; - default: - SPD_ERR("SDRAM - unsupported mode\n"); - } - - /*------------------------------------------------------------------ - * using the calculated values, compute the bank - * config register values. - * -------------------------------------------------------------------*/ - sdram0_b1cr = 0; - sdram0_b2cr = 0; - sdram0_b3cr = 0; - - /* compute the size of each bank */ - bank_size = total_size / bank_cnt; - /* convert bank size to bank size code for ppc4xx - by takeing log2(bank_size) - 22 */ - tmp = bank_size; /* start with tmp = bank_size */ - bank_code = 0; /* and bank_code = 0 */ - while (tmp > 1) { /* this takes log2 of tmp */ - bank_code++; /* and stores result in bank_code */ - tmp = tmp >> 1; - } /* bank_code is now log2(bank_size) */ - bank_code -= 22; /* subtract 22 to get the code */ - - tmp = SDRAM0_BXCR_SZ(bank_code) | SDRAM0_BXCR_AM(mode) | 1; - sdram0_b0cr = (bank_size * 0) | tmp; -#ifndef CONFIG_405EP /* not on PPC405EP */ - if (bank_cnt > 1) - sdram0_b2cr = (bank_size * 1) | tmp; - if (bank_cnt > 2) - sdram0_b1cr = (bank_size * 2) | tmp; - if (bank_cnt > 3) - sdram0_b3cr = (bank_size * 3) | tmp; -#else - /* PPC405EP chip only supports two SDRAM banks */ - if (bank_cnt > 1) - sdram0_b1cr = (bank_size * 1) | tmp; - if (bank_cnt > 2) - total_size = 2 * bank_size; -#endif - - /* - * enable sdram controller DCE=1 - * enable burst read prefetch to 32 bytes BRPF=2 - * leave other functions off - */ - - /*------------------------------------------------------------------ - * now that we've done our calculations, we are ready to - * program all the registers. - * -------------------------------------------------------------------*/ - - /* disable memcontroller so updates work */ - mtsdram(SDRAM0_CFG, 0); - -#ifndef CONFIG_405EP /* not on PPC405EP */ - mtsdram(SDRAM0_BESR0, sdram0_besr0); - mtsdram(SDRAM0_BESR1, sdram0_besr1); - mtsdram(SDRAM0_ECCCFG, sdram0_ecccfg); - mtsdram(SDRAM0_ECCESR, sdram0_eccesr); -#endif - mtsdram(SDRAM0_RTR, sdram0_rtr); - mtsdram(SDRAM0_PMIT, sdram0_pmit); - mtsdram(SDRAM0_B0CR, sdram0_b0cr); - mtsdram(SDRAM0_B1CR, sdram0_b1cr); -#ifndef CONFIG_405EP /* not on PPC405EP */ - mtsdram(SDRAM0_B2CR, sdram0_b2cr); - mtsdram(SDRAM0_B3CR, sdram0_b3cr); -#endif - mtsdram(SDRAM0_TR, sdram0_tr); - - /* SDRAM have a power on delay, 500 micro should do */ - udelay(500); - sdram0_cfg = SDRAM0_CFG_DCE | SDRAM0_CFG_BRPF(1) | SDRAM0_CFG_ECCDD | SDRAM0_CFG_EMDULR; - if (ecc_on) - sdram0_cfg |= SDRAM0_CFG_MEMCHK; - mtsdram(SDRAM0_CFG, sdram0_cfg); - - return (total_size); -} - -int spd_read(uint addr) -{ - uchar data[2]; - - if (i2c_read(SPD_EEPROM_ADDRESS, addr, 1, data, 1) == 0) - return (int)data[0]; - else - return 0; -} - -#endif /* CONFIG_SPD_EEPROM */ |