Required by JEDEC 79-3E for high speed DDR3. Also change "CSn disabled" message to debug.
Signed-off-by: York Sun yorksun@freescale.com --- arch/powerpc/cpu/mpc8xxx/ddr/ctrl_regs.c | 28 +++++++++++++++++++++------- 1 files changed, 21 insertions(+), 7 deletions(-)
diff --git a/arch/powerpc/cpu/mpc8xxx/ddr/ctrl_regs.c b/arch/powerpc/cpu/mpc8xxx/ddr/ctrl_regs.c index 2067d53..a8b2132 100644 --- a/arch/powerpc/cpu/mpc8xxx/ddr/ctrl_regs.c +++ b/arch/powerpc/cpu/mpc8xxx/ddr/ctrl_regs.c @@ -1,5 +1,5 @@ /* - * Copyright 2008-2011 Freescale Semiconductor, Inc. + * Copyright 2008-2012 Freescale Semiconductor, Inc. * * 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 @@ -825,7 +825,7 @@ static void set_ddr_sdram_mode(fsl_ddr_cfg_regs_t *ddr,
/* Mode Register - MR0 */ unsigned int dll_on; /* DLL control for precharge PD, 0=off, 1=on */ - unsigned int wr; /* Write Recovery */ + unsigned int wr = 0; /* Write Recovery */ unsigned int dll_rst; /* DLL Reset */ unsigned int mode; /* Normal=0 or Test=1 */ unsigned int caslat = 4;/* CAS# latency, default set as 6 cycles */ @@ -885,24 +885,37 @@ static void set_ddr_sdram_mode(fsl_ddr_cfg_regs_t *ddr, dll_on = 1;
wr_mclk = (common_dimm->tWR_ps + mclk_ps - 1) / mclk_ps; - wr = wr_table[wr_mclk - 5]; + if (wr_mclk <= 16) { + wr = wr_table[wr_mclk - 5]; + } else { + printf("Error: unsupported write recovery for mode register " + "wr_mclk = %d\n", wr_mclk); + }
dll_rst = 0; /* dll no reset */ mode = 0; /* normal mode */
/* look up table to get the cas latency bits */ - if (cas_latency >= 5 && cas_latency <= 11) { - unsigned char cas_latency_table[7] = { + if (cas_latency >= 5 && cas_latency <= 16) { + unsigned char cas_latency_table[] = { 0x2, /* 5 clocks */ 0x4, /* 6 clocks */ 0x6, /* 7 clocks */ 0x8, /* 8 clocks */ 0xa, /* 9 clocks */ 0xc, /* 10 clocks */ - 0xe /* 11 clocks */ + 0xe, /* 11 clocks */ + 0x1, /* 12 clocks */ + 0x3, /* 13 clocks */ + 0x5, /* 14 clocks */ + 0x7, /* 15 clocks */ + 0x9, /* 16 clocks */ }; caslat = cas_latency_table[cas_latency - 5]; + } else { + printf("Error: unsupported cas latency for mode register\n"); } + bt = 0; /* Nibble sequential */
switch (popts->burst_length) { @@ -930,6 +943,7 @@ static void set_ddr_sdram_mode(fsl_ddr_cfg_regs_t *ddr, | ((mode & 0x1) << 7) | (((caslat >> 1) & 0x7) << 4) | ((bt & 0x1) << 3) + | ((caslat & 1) << 2) | ((bl & 0x3) << 0) );
@@ -1574,7 +1588,7 @@ compute_fsl_memctl_config_regs(const memctl_options_t *popts, set_csn_config(dimm_number, i, ddr, popts, dimm_params); set_csn_config_2(i, ddr); } else - printf("CS%d is disabled.\n", i); + debug("CS%d is disabled.\n", i); }
/*