mpc83xx: Add DDR2 controller fixed/SPD Init for MPC83xx
The code supply fixed and SPD initialization for MPC83xx DDR2 Controller. it pass DDR/DDR2 compliance tests. Signed-off-by: Xie Xiaobo <X.Xie@freescale.com>
This commit is contained in:
Xie Xiaobo
Kim Phillips
parent
b110f40bd1
commit
d61853cf24
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@ -119,6 +119,20 @@ int fixed_sdram(void)
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#if (CFG_DDR_SIZE != 256)
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#warning Currenly any ddr size other than 256 is not supported
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#endif
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#ifdef CONFIG_DDR_II
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im->ddr.csbnds[2].csbnds = CFG_DDR_CS2_BNDS;
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im->ddr.cs_config[2] = CFG_DDR_CS2_CONFIG;
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im->ddr.timing_cfg_0 = CFG_DDR_TIMING_0;
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im->ddr.timing_cfg_1 = CFG_DDR_TIMING_1;
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im->ddr.timing_cfg_2 = CFG_DDR_TIMING_2;
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im->ddr.timing_cfg_3 = CFG_DDR_TIMING_3;
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im->ddr.sdram_cfg = CFG_DDR_SDRAM_CFG;
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im->ddr.sdram_cfg2 = CFG_DDR_SDRAM_CFG2;
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im->ddr.sdram_mode = CFG_DDR_MODE;
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im->ddr.sdram_mode2 = CFG_DDR_MODE2;
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im->ddr.sdram_interval = CFG_DDR_INTERVAL;
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im->ddr.sdram_clk_cntl = CFG_DDR_CLK_CNTL;
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#else
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im->ddr.csbnds[2].csbnds = 0x0000000f;
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im->ddr.cs_config[2] = CFG_DDR_CONFIG;
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@ -143,6 +157,7 @@ int fixed_sdram(void)
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im->ddr.sdram_mode = CFG_DDR_MODE;
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im->ddr.sdram_interval = CFG_DDR_INTERVAL;
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#endif
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udelay(200);
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/* enable DDR controller */
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@ -239,7 +254,7 @@ void sdram_init(void)
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#else
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void sdram_init(void)
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{
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put("SDRAM on Local Bus is NOT available!\n");
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puts(" SDRAM on Local Bus is NOT available!\n");
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}
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#endif
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@ -158,6 +158,20 @@ int fixed_sdram(void)
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#if (CFG_DDR_SIZE != 256)
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#warning Currenly any ddr size other than 256 is not supported
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#endif
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#ifdef CONFIG_DDR_II
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im->ddr.csbnds[0].csbnds = CFG_DDR_CS0_BNDS;
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im->ddr.cs_config[0] = CFG_DDR_CS0_CONFIG;
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im->ddr.timing_cfg_0 = CFG_DDR_TIMING_0;
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im->ddr.timing_cfg_1 = CFG_DDR_TIMING_1;
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im->ddr.timing_cfg_2 = CFG_DDR_TIMING_2;
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im->ddr.timing_cfg_3 = CFG_DDR_TIMING_3;
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im->ddr.sdram_cfg = CFG_DDR_SDRAM_CFG;
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im->ddr.sdram_cfg2 = CFG_DDR_SDRAM_CFG2;
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im->ddr.sdram_mode = CFG_DDR_MODE;
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im->ddr.sdram_mode2 = CFG_DDR_MODE2;
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im->ddr.sdram_interval = CFG_DDR_INTERVAL;
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im->ddr.sdram_clk_cntl = CFG_DDR_CLK_CNTL;
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#else
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im->ddr.csbnds[0].csbnds = 0x00000007;
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im->ddr.csbnds[1].csbnds = 0x0008000f;
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@ -170,6 +184,7 @@ int fixed_sdram(void)
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im->ddr.sdram_mode = CFG_DDR_MODE;
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im->ddr.sdram_interval = CFG_DDR_INTERVAL;
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#endif
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udelay(200);
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im->ddr.sdram_cfg |= SDRAM_CFG_MEM_EN;
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@ -106,16 +106,29 @@ long int spd_sdram()
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volatile ddr83xx_t *ddr = &immap->ddr;
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volatile law83xx_t *ecm = &immap->sysconf.ddrlaw[0];
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spd_eeprom_t spd;
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unsigned int n_ranks;
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unsigned int odt_rd_cfg, odt_wr_cfg;
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unsigned char twr_clk, twtr_clk;
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unsigned char sdram_type;
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unsigned int memsize;
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unsigned int law_size;
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unsigned char caslat, caslat_ctrl;
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unsigned int trfc, trfc_clk, trfc_low, trfc_high;
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unsigned int trcd_clk, trtp_clk;
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unsigned char cke_min_clk;
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unsigned char add_lat, wr_lat;
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unsigned char wr_data_delay;
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unsigned char four_act;
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unsigned char cpo;
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unsigned char burstlen;
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unsigned char odt_cfg, mode_odt_enable;
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unsigned int max_bus_clk;
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unsigned int max_data_rate, effective_data_rate;
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unsigned int ddrc_clk;
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unsigned int refresh_clk;
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unsigned sdram_cfg;
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unsigned int sdram_cfg;
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unsigned int ddrc_ecc_enable;
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unsigned int pvr = get_pvr();
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/* Read SPD parameters with I2C */
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CFG_READ_SPD(SPD_EEPROM_ADDRESS, 0, 1, (uchar *) & spd, sizeof (spd));
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@ -123,19 +136,25 @@ long int spd_sdram()
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spd_debug(&spd);
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#endif
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/* Check the memory type */
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if (spd.mem_type != SPD_MEMTYPE_DDR) {
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if (spd.mem_type != SPD_MEMTYPE_DDR && spd.mem_type != SPD_MEMTYPE_DDR2) {
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printf("DDR: Module mem type is %02X\n", spd.mem_type);
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return 0;
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}
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/* Check the number of physical bank */
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if (spd.nrows > 2) {
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printf("DDR: The number of physical bank is %02X\n", spd.nrows);
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if (spd.mem_type == SPD_MEMTYPE_DDR) {
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n_ranks = spd.nrows;
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} else {
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n_ranks = (spd.nrows & 0x7) + 1;
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}
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if (n_ranks > 2) {
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printf("DDR: The number of physical bank is %02X\n", n_ranks);
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return 0;
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}
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/* Check if the number of row of the module is in the range of DDRC */
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if (spd.nrow_addr < 12 || spd.nrow_addr > 14) {
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if (spd.nrow_addr < 12 || spd.nrow_addr > 15) {
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printf("DDR: Row number is out of range of DDRC, row=%02X\n",
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spd.nrow_addr);
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return 0;
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@ -147,20 +166,43 @@ long int spd_sdram()
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spd.ncol_addr);
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return 0;
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}
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#ifdef CFG_DDRCDR_VALUE
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/*
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* Adjust DDR II IO voltage biasing. It just makes it work.
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*/
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if(spd.mem_type == SPD_MEMTYPE_DDR2) {
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immap->sysconf.ddrcdr = CFG_DDRCDR_VALUE;
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}
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#endif
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/*
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* ODT configuration recommendation from DDR Controller Chapter.
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*/
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odt_rd_cfg = 0; /* Never assert ODT */
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odt_wr_cfg = 0; /* Never assert ODT */
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if (spd.mem_type == SPD_MEMTYPE_DDR2) {
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odt_wr_cfg = 1; /* Assert ODT on writes to CSn */
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}
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/* Setup DDR chip select register */
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#ifdef CFG_83XX_DDR_USES_CS0
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ddr->csbnds[0].csbnds = (banksize(spd.row_dens) >> 24) - 1;
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ddr->cs_config[0] = ( 1 << 31
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| (odt_rd_cfg << 20)
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| (odt_wr_cfg << 16)
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| (spd.nrow_addr - 12) << 8
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| (spd.ncol_addr - 8) );
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debug("\n");
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debug("cs0_bnds = 0x%08x\n",ddr->csbnds[0].csbnds);
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debug("cs0_config = 0x%08x\n",ddr->cs_config[0]);
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if (spd.nrows == 2) {
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if (n_ranks == 2) {
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ddr->csbnds[1].csbnds = ( (banksize(spd.row_dens) >> 8)
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| ((banksize(spd.row_dens) >> 23) - 1) );
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ddr->cs_config[1] = ( 1<<31
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| (odt_rd_cfg << 20)
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| (odt_wr_cfg << 16)
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| (spd.nrow_addr-12) << 8
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| (spd.ncol_addr-8) );
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debug("cs1_bnds = 0x%08x\n",ddr->csbnds[1].csbnds);
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@ -170,16 +212,20 @@ long int spd_sdram()
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#else
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ddr->csbnds[2].csbnds = (banksize(spd.row_dens) >> 24) - 1;
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ddr->cs_config[2] = ( 1 << 31
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| (odt_rd_cfg << 20)
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| (odt_wr_cfg << 16)
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| (spd.nrow_addr - 12) << 8
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| (spd.ncol_addr - 8) );
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debug("\n");
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debug("cs2_bnds = 0x%08x\n",ddr->csbnds[2].csbnds);
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debug("cs2_config = 0x%08x\n",ddr->cs_config[2]);
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if (spd.nrows == 2) {
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if (n_ranks == 2) {
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ddr->csbnds[3].csbnds = ( (banksize(spd.row_dens) >> 8)
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| ((banksize(spd.row_dens) >> 23) - 1) );
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ddr->cs_config[3] = ( 1<<31
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| (odt_rd_cfg << 20)
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| (odt_wr_cfg << 16)
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| (spd.nrow_addr-12) << 8
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| (spd.ncol_addr-8) );
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debug("cs3_bnds = 0x%08x\n",ddr->csbnds[3].csbnds);
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@ -187,15 +233,10 @@ long int spd_sdram()
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}
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#endif
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if (spd.mem_type != 0x07) {
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puts("No DDR module found!\n");
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return 0;
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}
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/*
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* Figure out memory size in Megabytes.
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*/
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memsize = spd.nrows * banksize(spd.row_dens) / 0x100000;
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memsize = n_ranks * banksize(spd.row_dens) / 0x100000;
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/*
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* First supported LAW size is 16M, at LAWAR_SIZE_16M == 23.
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@ -215,24 +256,32 @@ long int spd_sdram()
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* in the spd.cas_lat field. Translate it to a DDR
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* controller field value:
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*
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* CAS Lat DDR I Ctrl
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* Clocks SPD Bit Value
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* -------+--------+---------
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* 1.0 0 001
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* 1.5 1 010
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* 2.0 2 011
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* 2.5 3 100
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* 3.0 4 101
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* 3.5 5 110
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* 4.0 6 111
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* CAS Lat DDR I DDR II Ctrl
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* Clocks SPD Bit SPD Bit Value
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* ------- ------- ------- -----
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* 1.0 0 0001
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* 1.5 1 0010
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* 2.0 2 2 0011
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* 2.5 3 0100
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* 3.0 4 3 0101
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* 3.5 5 0110
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* 4.0 6 4 0111
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* 4.5 1000
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* 5.0 5 1001
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*/
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caslat = __ilog2(spd.cas_lat);
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if (caslat > 6 ) {
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printf("DDR: Invalid SPD CAS Latency, caslat=%02X\n",
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spd.cas_lat);
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if ((spd.mem_type == SPD_MEMTYPE_DDR)
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&& (caslat > 6)) {
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printf("DDR I: Invalid SPD CAS Latency: 0x%x.\n", spd.cas_lat);
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return 0;
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} else if (spd.mem_type == SPD_MEMTYPE_DDR2
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&& (caslat < 2 || caslat > 5)) {
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printf("DDR II: Invalid SPD CAS Latency: 0x%x.\n",
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spd.cas_lat);
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return 0;
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}
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debug("DDR: caslat SPD bit is %d\n", caslat);
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max_bus_clk = 1000 *10 / (((spd.clk_cycle & 0xF0) >> 4) * 10
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+ (spd.clk_cycle & 0x0f));
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max_data_rate = max_bus_clk * 2;
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@ -240,10 +289,11 @@ long int spd_sdram()
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debug("DDR:Module maximum data rate is: %dMhz\n", max_data_rate);
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ddrc_clk = gd->ddr_clk / 1000000;
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effective_data_rate = 0;
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if (max_data_rate >= 390) { /* it is DDR 400 */
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if (ddrc_clk <= 410 && ddrc_clk > 350) {
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/* DDR controller clk at 350~410 */
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if (max_data_rate >= 390 && max_data_rate < 460) { /* it is DDR 400 */
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if (ddrc_clk <= 460 && ddrc_clk > 350) {
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/* DDR controller clk at 350~460 */
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effective_data_rate = 400; /* 5ns */
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caslat = caslat;
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} else if (ddrc_clk <= 350 && ddrc_clk > 280) {
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@ -258,16 +308,16 @@ long int spd_sdram()
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effective_data_rate = 266; /* 7.5ns */
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if (spd.clk_cycle3 == 0x75)
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caslat = caslat - 2;
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else if (spd.clk_cycle2 == 0x60)
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else if (spd.clk_cycle2 == 0x75)
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caslat = caslat - 1;
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else
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caslat = caslat;
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} else if (ddrc_clk <= 230 && ddrc_clk > 90) {
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/* DDR controller clk at 90~230 */
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effective_data_rate = 200; /* 10ns */
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if (spd.clk_cycle3 == 0x75)
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if (spd.clk_cycle3 == 0xa0)
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caslat = caslat - 2;
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else if (spd.clk_cycle2 == 0x60)
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else if (spd.clk_cycle2 == 0xa0)
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caslat = caslat - 1;
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else
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caslat = caslat;
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@ -289,7 +339,7 @@ long int spd_sdram()
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effective_data_rate = 200; /* 10ns */
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if (spd.clk_cycle3 == 0xa0)
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caslat = caslat - 2;
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else if (spd.clk_cycle2 == 0x75)
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else if (spd.clk_cycle2 == 0xa0)
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caslat = caslat - 1;
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else
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caslat = caslat;
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@ -330,41 +380,197 @@ long int spd_sdram()
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* Errata DDR6 work around: input enable 2 cycles earlier.
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* including MPC834x Rev1.0/1.1 and MPC8360 Rev1.1/1.2.
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*/
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if (caslat == 2)
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ddr->debug_reg = 0x201c0000; /* CL=2 */
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else if (caslat == 3)
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ddr->debug_reg = 0x202c0000; /* CL=2.5 */
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else if (caslat == 4)
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ddr->debug_reg = 0x202c0000; /* CL=3.0 */
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if(PVR_MAJ(pvr) <= 1 && spd.mem_type == SPD_MEMTYPE_DDR){
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if (caslat == 2)
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ddr->debug_reg = 0x201c0000; /* CL=2 */
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else if (caslat == 3)
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ddr->debug_reg = 0x202c0000; /* CL=2.5 */
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else if (caslat == 4)
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ddr->debug_reg = 0x202c0000; /* CL=3.0 */
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__asm__ __volatile__ ("sync");
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__asm__ __volatile__ ("sync");
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debug("Errata DDR6 (debug_reg=0x%08x)\n", ddr->debug_reg);
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debug("Errata DDR6 (debug_reg=0x%08x)\n", ddr->debug_reg);
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}
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/*
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* note: caslat must also be programmed into ddr->sdram_mode
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* register.
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*
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* note: WRREC(Twr) and WRTORD(Twtr) are not in SPD,
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* use conservative value here.
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* Convert caslat clocks to DDR controller value.
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* Force caslat_ctrl to be DDR Controller field-sized.
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*/
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caslat_ctrl = (caslat + 1) & 0x07; /* see as above */
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if (spd.mem_type == SPD_MEMTYPE_DDR) {
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caslat_ctrl = (caslat + 1) & 0x07;
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} else {
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caslat_ctrl = (2 * caslat - 1) & 0x0f;
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}
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debug("DDR: effective data rate is %d MHz\n", effective_data_rate);
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debug("DDR: caslat SPD bit is %d, controller field is 0x%x\n",
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caslat, caslat_ctrl);
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/*
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* Timing Config 0.
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* Avoid writing for DDR I.
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*/
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if (spd.mem_type == SPD_MEMTYPE_DDR2) {
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unsigned char taxpd_clk = 8; /* By the book. */
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unsigned char tmrd_clk = 2; /* By the book. */
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unsigned char act_pd_exit = 2; /* Empirical? */
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unsigned char pre_pd_exit = 6; /* Empirical? */
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ddr->timing_cfg_0 = (0
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| ((act_pd_exit & 0x7) << 20) /* ACT_PD_EXIT */
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| ((pre_pd_exit & 0x7) << 16) /* PRE_PD_EXIT */
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| ((taxpd_clk & 0xf) << 8) /* ODT_PD_EXIT */
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| ((tmrd_clk & 0xf) << 0) /* MRS_CYC */
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);
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debug("DDR: timing_cfg_0 = 0x%08x\n", ddr->timing_cfg_0);
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}
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/*
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* For DDR I, WRREC(Twr) and WRTORD(Twtr) are not in SPD,
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* use conservative value.
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* For DDR II, they are bytes 36 and 37, in quarter nanos.
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*/
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if (spd.mem_type == SPD_MEMTYPE_DDR) {
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twr_clk = 3; /* Clocks */
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twtr_clk = 1; /* Clocks */
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} else {
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twr_clk = picos_to_clk(spd.twr * 250);
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twtr_clk = picos_to_clk(spd.twtr * 250);
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}
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/*
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* Calculate Trfc, in picos.
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* DDR I: Byte 42 straight up in ns.
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* DDR II: Byte 40 and 42 swizzled some, in ns.
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*/
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if (spd.mem_type == SPD_MEMTYPE_DDR) {
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trfc = spd.trfc * 1000; /* up to ps */
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} else {
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unsigned int byte40_table_ps[8] = {
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0,
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250,
|
||||
330,
|
||||
500,
|
||||
660,
|
||||
750,
|
||||
0,
|
||||
0
|
||||
};
|
||||
|
||||
trfc = (((spd.trctrfc_ext & 0x1) * 256) + spd.trfc) * 1000
|
||||
+ byte40_table_ps[(spd.trctrfc_ext >> 1) & 0x7];
|
||||
}
|
||||
trfc_clk = picos_to_clk(trfc);
|
||||
|
||||
/*
|
||||
* Trcd, Byte 29, from quarter nanos to ps and clocks.
|
||||
*/
|
||||
trcd_clk = picos_to_clk(spd.trcd * 250) & 0x7;
|
||||
|
||||
/*
|
||||
* Convert trfc_clk to DDR controller fields. DDR I should
|
||||
* fit in the REFREC field (16-19) of TIMING_CFG_1, but the
|
||||
* 83xx controller has an extended REFREC field of three bits.
|
||||
* The controller automatically adds 8 clocks to this value,
|
||||
* so preadjust it down 8 first before splitting it up.
|
||||
*/
|
||||
trfc_low = (trfc_clk - 8) & 0xf;
|
||||
trfc_high = ((trfc_clk - 8) >> 4) & 0x3;
|
||||
|
||||
ddr->timing_cfg_1 =
|
||||
(((picos_to_clk(spd.trp * 250) & 0x07) << 28 ) |
|
||||
((picos_to_clk(spd.tras * 1000) & 0x0f ) << 24 ) |
|
||||
((picos_to_clk(spd.trcd * 250) & 0x07) << 20 ) |
|
||||
((caslat_ctrl & 0x07) << 16 ) |
|
||||
(((picos_to_clk(spd.trfc * 1000) - 8) & 0x0f) << 12 ) |
|
||||
( 0x300 ) |
|
||||
((picos_to_clk(spd.trrd * 250) & 0x07) << 4) | 1);
|
||||
(((picos_to_clk(spd.trp * 250) & 0x07) << 28 ) | /* PRETOACT */
|
||||
((picos_to_clk(spd.tras * 1000) & 0x0f ) << 24 ) | /* ACTTOPRE */
|
||||
(trcd_clk << 20 ) | /* ACTTORW */
|
||||
(caslat_ctrl << 16 ) | /* CASLAT */
|
||||
(trfc_low << 12 ) | /* REFEC */
|
||||
((twr_clk & 0x07) << 8) | /* WRRREC */
|
||||
((picos_to_clk(spd.trrd * 250) & 0x07) << 4) | /* ACTTOACT */
|
||||
((twtr_clk & 0x07) << 0) /* WRTORD */
|
||||
);
|
||||
|
||||
ddr->timing_cfg_2 = 0x00000800;
|
||||
/*
|
||||
* Additive Latency
|
||||
* For DDR I, 0.
|
||||
* For DDR II, with ODT enabled, use "a value" less than ACTTORW,
|
||||
* which comes from Trcd, and also note that:
|
||||
* add_lat + caslat must be >= 4
|
||||
*/
|
||||
add_lat = 0;
|
||||
if (spd.mem_type == SPD_MEMTYPE_DDR2
|
||||
&& (odt_wr_cfg || odt_rd_cfg)
|
||||
&& (caslat < 4)) {
|
||||
add_lat = trcd_clk - 1;
|
||||
if ((add_lat + caslat) < 4) {
|
||||
add_lat = 0;
|
||||
}
|
||||
}
|
||||
|
||||
/*
|
||||
* Write Data Delay
|
||||
* Historically 0x2 == 4/8 clock delay.
|
||||
* Empirically, 0x3 == 6/8 clock delay is suggested for DDR I 266.
|
||||
*/
|
||||
wr_data_delay = 2;
|
||||
|
||||
/*
|
||||
* Write Latency
|
||||
* Read to Precharge
|
||||
* Minimum CKE Pulse Width.
|
||||
* Four Activate Window
|
||||
*/
|
||||
if (spd.mem_type == SPD_MEMTYPE_DDR) {
|
||||
/*
|
||||
* This is a lie. It should really be 1, but if it is
|
||||
* set to 1, bits overlap into the old controller's
|
||||
* otherwise unused ACSM field. If we leave it 0, then
|
||||
* the HW will magically treat it as 1 for DDR 1. Oh Yea.
|
||||
*/
|
||||
wr_lat = 0;
|
||||
|
||||
trtp_clk = 2; /* By the book. */
|
||||
cke_min_clk = 1; /* By the book. */
|
||||
four_act = 1; /* By the book. */
|
||||
|
||||
} else {
|
||||
wr_lat = caslat - 1;
|
||||
|
||||
/* Convert SPD value from quarter nanos to picos. */
|
||||
trtp_clk = picos_to_clk(spd.trtp * 250);
|
||||
|
||||
cke_min_clk = 3; /* By the book. */
|
||||
four_act = picos_to_clk(37500); /* By the book. 1k pages? */
|
||||
}
|
||||
|
||||
/*
|
||||
* Empirically set ~MCAS-to-preamble override for DDR 2.
|
||||
* Your milage will vary.
|
||||
*/
|
||||
cpo = 0;
|
||||
if (spd.mem_type == SPD_MEMTYPE_DDR2) {
|
||||
if (effective_data_rate == 266 || effective_data_rate == 333) {
|
||||
cpo = 0x7; /* READ_LAT + 5/4 */
|
||||
} else if (effective_data_rate == 400) {
|
||||
cpo = 0x9; /* READ_LAT + 7/4 */
|
||||
} else {
|
||||
/* Automatic calibration */
|
||||
cpo = 0x1f;
|
||||
}
|
||||
}
|
||||
|
||||
ddr->timing_cfg_2 = (0
|
||||
| ((add_lat & 0x7) << 28) /* ADD_LAT */
|
||||
| ((cpo & 0x1f) << 23) /* CPO */
|
||||
| ((wr_lat & 0x7) << 19) /* WR_LAT */
|
||||
| ((trtp_clk & 0x7) << 13) /* RD_TO_PRE */
|
||||
| ((wr_data_delay & 0x7) << 10) /* WR_DATA_DELAY */
|
||||
| ((cke_min_clk & 0x7) << 6) /* CKE_PLS */
|
||||
| ((four_act & 0x1f) << 0) /* FOUR_ACT */
|
||||
);
|
||||
|
||||
debug("DDR:timing_cfg_1=0x%08x\n", ddr->timing_cfg_1);
|
||||
debug("DDR:timing_cfg_2=0x%08x\n", ddr->timing_cfg_2);
|
||||
/* Setup init value, but not enable */
|
||||
ddr->sdram_cfg = 0x42000000;
|
||||
|
||||
/* Check DIMM data bus width */
|
||||
if (spd.dataw_lsb == 0x20) {
|
||||
|
|
@ -384,7 +590,8 @@ long int spd_sdram()
|
|||
/* Burst length is always 4 for 64 bit data bus, 8 for 32 bit data bus,
|
||||
Burst type is sequential
|
||||
*/
|
||||
switch (caslat) {
|
||||
if (spd.mem_type == SPD_MEMTYPE_DDR) {
|
||||
switch (caslat) {
|
||||
case 1:
|
||||
ddr->sdram_mode = 0x50 | burstlen; /* CL=1.5 */
|
||||
break;
|
||||
|
|
@ -400,9 +607,36 @@ long int spd_sdram()
|
|||
default:
|
||||
printf("DDR:only CL 1.5, 2.0, 2.5, 3.0 is supported\n");
|
||||
return 0;
|
||||
}
|
||||
} else {
|
||||
mode_odt_enable = 0x0; /* Default disabled */
|
||||
if (odt_wr_cfg || odt_rd_cfg) {
|
||||
/*
|
||||
* Bits 6 and 2 in Extended MRS(1)
|
||||
* Bit 2 == 0x04 == 75 Ohm, with 2 DIMM modules.
|
||||
* Bit 6 == 0x40 == 150 Ohm, with 1 DIMM module.
|
||||
*/
|
||||
mode_odt_enable = 0x40; /* 150 Ohm */
|
||||
}
|
||||
|
||||
ddr->sdram_mode =
|
||||
(0
|
||||
| (1 << (16 + 10)) /* DQS Differential disable */
|
||||
| (add_lat << (16 + 3)) /* Additive Latency in EMRS1 */
|
||||
| (mode_odt_enable << 16) /* ODT Enable in EMRS1 */
|
||||
| ((twr_clk >> 1) << 9) /* Write Recovery Autopre */
|
||||
| (caslat << 4) /* caslat */
|
||||
| (burstlen << 0) /* Burst length */
|
||||
);
|
||||
}
|
||||
debug("DDR:sdram_mode=0x%08x\n", ddr->sdram_mode);
|
||||
|
||||
/*
|
||||
* Clear EMRS2 and EMRS3.
|
||||
*/
|
||||
ddr->sdram_mode2 = 0;
|
||||
debug("DDR: sdram_mode2 = 0x%08x\n", ddr->sdram_mode2);
|
||||
|
||||
switch (spd.refresh) {
|
||||
case 0x00:
|
||||
case 0x80:
|
||||
|
|
@ -440,6 +674,23 @@ long int spd_sdram()
|
|||
ddr->sdram_interval = ((refresh_clk & 0x3fff) << 16) | 0x100;
|
||||
debug("DDR:sdram_interval=0x%08x\n", ddr->sdram_interval);
|
||||
|
||||
/*
|
||||
* SDRAM Cfg 2
|
||||
*/
|
||||
odt_cfg = 0;
|
||||
if (odt_rd_cfg | odt_wr_cfg) {
|
||||
odt_cfg = 0x2; /* ODT to IOs during reads */
|
||||
}
|
||||
if (spd.mem_type == SPD_MEMTYPE_DDR2) {
|
||||
ddr->sdram_cfg2 = (0
|
||||
| (0 << 26) /* True DQS */
|
||||
| (odt_cfg << 21) /* ODT only read */
|
||||
| (1 << 12) /* 1 refresh at a time */
|
||||
);
|
||||
|
||||
debug("DDR: sdram_cfg2 = 0x%08x\n", ddr->sdram_cfg2);
|
||||
}
|
||||
|
||||
#ifdef CFG_DDR_SDRAM_CLK_CNTL /* Optional platform specific value */
|
||||
ddr->sdram_clk_cntl = CFG_DDR_SDRAM_CLK_CNTL;
|
||||
#else
|
||||
|
|
@ -462,11 +713,22 @@ long int spd_sdram()
|
|||
*
|
||||
* sdram_cfg[0] = 1 (ddr sdram logic enable)
|
||||
* sdram_cfg[1] = 1 (self-refresh-enable)
|
||||
* sdram_cfg[6:7] = 2 (SDRAM type = DDR SDRAM)
|
||||
* sdram_cfg[5:7] = (SDRAM type = DDR SDRAM)
|
||||
* 010 DDR 1 SDRAM
|
||||
* 011 DDR 2 SDRAM
|
||||
* sdram_cfg[12] = 0 (32_BE =0 , 64 bit bus mode)
|
||||
* sdram_cfg[13] = 0 (8_BE =0, 4-beat bursts)
|
||||
*/
|
||||
sdram_cfg = 0xC2000000;
|
||||
if (spd.mem_type == SPD_MEMTYPE_DDR)
|
||||
sdram_type = 2;
|
||||
else
|
||||
sdram_type = 3;
|
||||
|
||||
sdram_cfg = (0
|
||||
| (1 << 31) /* DDR enable */
|
||||
| (1 << 30) /* Self refresh */
|
||||
| (sdram_type << 24) /* SDRAM type */
|
||||
);
|
||||
|
||||
/* sdram_cfg[3] = RD_EN - registered DIMM enable */
|
||||
if (spd.mod_attr & 0x02)
|
||||
|
|
|
|||
Loading…
Reference in New Issue