+++ /dev/null
-/*
- * 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 */
projects / oweals / u-boot.git / blobdiff