From 4e57382faa4bcad285baee21737de2c99ba6baad Mon Sep 17 00:00:00 2001 From: York Sun Date: Fri, 26 Aug 2011 11:32:43 -0700 Subject: [PATCH] powerpc/mpc8xxx: Add DDR2 to unified DDR driver DDR2 has different ODT table and values. Adding table according to Samsung application note. Fix additive latency calculation to avoid interger underflow. Also converted typedef dynamic_odt_t to struct dynamic_odt. Signed-off-by: York Sun Signed-off-by: Kumar Gala --- .../cpu/mpc8xxx/ddr/lc_common_dimm_params.c | 3 +- arch/powerpc/cpu/mpc8xxx/ddr/options.c | 244 ++++++++++++++++-- arch/powerpc/include/asm/fsl_ddr_sdram.h | 5 + doc/README.fsl-ddr | 52 ++++ 4 files changed, 287 insertions(+), 17 deletions(-) diff --git a/arch/powerpc/cpu/mpc8xxx/ddr/lc_common_dimm_params.c b/arch/powerpc/cpu/mpc8xxx/ddr/lc_common_dimm_params.c index 8132e68d9d6..20c7db03ede 100644 --- a/arch/powerpc/cpu/mpc8xxx/ddr/lc_common_dimm_params.c +++ b/arch/powerpc/cpu/mpc8xxx/ddr/lc_common_dimm_params.c @@ -448,7 +448,8 @@ compute_lowest_common_dimm_parameters(const dimm_params_t *dimm_params, #if defined(CONFIG_FSL_DDR2) if (lowest_good_caslat < 4) { - additive_latency = picos_to_mclk(tRCD_ps) - lowest_good_caslat; + additive_latency = (picos_to_mclk(tRCD_ps) > lowest_good_caslat) + ? picos_to_mclk(tRCD_ps) - lowest_good_caslat : 0; if (mclk_to_picos(additive_latency) > tRCD_ps) { additive_latency = picos_to_mclk(tRCD_ps); debug("setting additive_latency to %u because it was " diff --git a/arch/powerpc/cpu/mpc8xxx/ddr/options.c b/arch/powerpc/cpu/mpc8xxx/ddr/options.c index 89dc479a391..4dc748b9510 100644 --- a/arch/powerpc/cpu/mpc8xxx/ddr/options.c +++ b/arch/powerpc/cpu/mpc8xxx/ddr/options.c @@ -26,14 +26,15 @@ extern void fsl_ddr_board_options(memctl_options_t *popts, dimm_params_t *pdimm, unsigned int ctrl_num); -typedef struct { +struct dynamic_odt { unsigned int odt_rd_cfg; unsigned int odt_wr_cfg; unsigned int odt_rtt_norm; unsigned int odt_rtt_wr; -} dynamic_odt_t; +}; -static const dynamic_odt_t single_Q[4] = { +#ifdef CONFIG_FSL_DDR3 +static const struct dynamic_odt single_Q[4] = { { /* cs0 */ FSL_DDR_ODT_NEVER, FSL_DDR_ODT_CS_AND_OTHER_DIMM, @@ -60,7 +61,7 @@ static const dynamic_odt_t single_Q[4] = { } }; -static const dynamic_odt_t single_D[4] = { +static const struct dynamic_odt single_D[4] = { { /* cs0 */ FSL_DDR_ODT_NEVER, FSL_DDR_ODT_ALL, @@ -77,7 +78,7 @@ static const dynamic_odt_t single_D[4] = { {0, 0, 0, 0} }; -static const dynamic_odt_t single_S[4] = { +static const struct dynamic_odt single_S[4] = { { /* cs0 */ FSL_DDR_ODT_NEVER, FSL_DDR_ODT_ALL, @@ -89,7 +90,7 @@ static const dynamic_odt_t single_S[4] = { {0, 0, 0, 0}, }; -static const dynamic_odt_t dual_DD[4] = { +static const struct dynamic_odt dual_DD[4] = { { /* cs0 */ FSL_DDR_ODT_NEVER, FSL_DDR_ODT_SAME_DIMM, @@ -116,7 +117,7 @@ static const dynamic_odt_t dual_DD[4] = { } }; -static const dynamic_odt_t dual_DS[4] = { +static const struct dynamic_odt dual_DS[4] = { { /* cs0 */ FSL_DDR_ODT_NEVER, FSL_DDR_ODT_SAME_DIMM, @@ -137,7 +138,7 @@ static const dynamic_odt_t dual_DS[4] = { }, {0, 0, 0, 0} }; -static const dynamic_odt_t dual_SD[4] = { +static const struct dynamic_odt dual_SD[4] = { { /* cs0 */ FSL_DDR_ODT_OTHER_DIMM, FSL_DDR_ODT_ALL, @@ -159,7 +160,7 @@ static const dynamic_odt_t dual_SD[4] = { } }; -static const dynamic_odt_t dual_SS[4] = { +static const struct dynamic_odt dual_SS[4] = { { /* cs0 */ FSL_DDR_ODT_OTHER_DIMM, FSL_DDR_ODT_ALL, @@ -176,7 +177,7 @@ static const dynamic_odt_t dual_SS[4] = { {0, 0, 0, 0} }; -static const dynamic_odt_t dual_D0[4] = { +static const struct dynamic_odt dual_D0[4] = { { /* cs0 */ FSL_DDR_ODT_NEVER, FSL_DDR_ODT_SAME_DIMM, @@ -193,7 +194,7 @@ static const dynamic_odt_t dual_D0[4] = { {0, 0, 0, 0} }; -static const dynamic_odt_t dual_0D[4] = { +static const struct dynamic_odt dual_0D[4] = { {0, 0, 0, 0}, {0, 0, 0, 0}, { /* cs2 */ @@ -210,7 +211,7 @@ static const dynamic_odt_t dual_0D[4] = { } }; -static const dynamic_odt_t dual_S0[4] = { +static const struct dynamic_odt dual_S0[4] = { { /* cs0 */ FSL_DDR_ODT_NEVER, FSL_DDR_ODT_CS, @@ -223,7 +224,7 @@ static const dynamic_odt_t dual_S0[4] = { }; -static const dynamic_odt_t dual_0S[4] = { +static const struct dynamic_odt dual_0S[4] = { {0, 0, 0, 0}, {0, 0, 0, 0}, { /* cs2 */ @@ -236,7 +237,7 @@ static const dynamic_odt_t dual_0S[4] = { }; -static const dynamic_odt_t odt_unknown[4] = { +static const struct dynamic_odt odt_unknown[4] = { { /* cs0 */ FSL_DDR_ODT_NEVER, FSL_DDR_ODT_CS, @@ -262,7 +263,218 @@ static const dynamic_odt_t odt_unknown[4] = { DDR3_RTT_OFF } }; +#else /* CONFIG_FSL_DDR3 */ +static const struct dynamic_odt single_Q[4] = { + {0, 0, 0, 0}, + {0, 0, 0, 0}, + {0, 0, 0, 0}, + {0, 0, 0, 0} +}; +static const struct dynamic_odt single_D[4] = { + { /* cs0 */ + FSL_DDR_ODT_NEVER, + FSL_DDR_ODT_ALL, + DDR2_RTT_150_OHM, + DDR2_RTT_OFF + }, + { /* cs1 */ + FSL_DDR_ODT_NEVER, + FSL_DDR_ODT_NEVER, + DDR2_RTT_OFF, + DDR2_RTT_OFF + }, + {0, 0, 0, 0}, + {0, 0, 0, 0} +}; + +static const struct dynamic_odt single_S[4] = { + { /* cs0 */ + FSL_DDR_ODT_NEVER, + FSL_DDR_ODT_ALL, + DDR2_RTT_150_OHM, + DDR2_RTT_OFF + }, + {0, 0, 0, 0}, + {0, 0, 0, 0}, + {0, 0, 0, 0}, +}; + +static const struct dynamic_odt dual_DD[4] = { + { /* cs0 */ + FSL_DDR_ODT_OTHER_DIMM, + FSL_DDR_ODT_OTHER_DIMM, + DDR2_RTT_75_OHM, + DDR2_RTT_OFF + }, + { /* cs1 */ + FSL_DDR_ODT_NEVER, + FSL_DDR_ODT_NEVER, + DDR2_RTT_OFF, + DDR2_RTT_OFF + }, + { /* cs2 */ + FSL_DDR_ODT_OTHER_DIMM, + FSL_DDR_ODT_OTHER_DIMM, + DDR2_RTT_75_OHM, + DDR2_RTT_OFF + }, + { /* cs3 */ + FSL_DDR_ODT_NEVER, + FSL_DDR_ODT_NEVER, + DDR2_RTT_OFF, + DDR2_RTT_OFF + } +}; + +static const struct dynamic_odt dual_DS[4] = { + { /* cs0 */ + FSL_DDR_ODT_OTHER_DIMM, + FSL_DDR_ODT_OTHER_DIMM, + DDR2_RTT_75_OHM, + DDR2_RTT_OFF + }, + { /* cs1 */ + FSL_DDR_ODT_NEVER, + FSL_DDR_ODT_NEVER, + DDR2_RTT_OFF, + DDR2_RTT_OFF + }, + { /* cs2 */ + FSL_DDR_ODT_OTHER_DIMM, + FSL_DDR_ODT_OTHER_DIMM, + DDR2_RTT_75_OHM, + DDR2_RTT_OFF + }, + {0, 0, 0, 0} +}; + +static const struct dynamic_odt dual_SD[4] = { + { /* cs0 */ + FSL_DDR_ODT_OTHER_DIMM, + FSL_DDR_ODT_OTHER_DIMM, + DDR2_RTT_75_OHM, + DDR2_RTT_OFF + }, + {0, 0, 0, 0}, + { /* cs2 */ + FSL_DDR_ODT_OTHER_DIMM, + FSL_DDR_ODT_OTHER_DIMM, + DDR2_RTT_75_OHM, + DDR2_RTT_OFF + }, + { /* cs3 */ + FSL_DDR_ODT_NEVER, + FSL_DDR_ODT_NEVER, + DDR2_RTT_OFF, + DDR2_RTT_OFF + } +}; + +static const struct dynamic_odt dual_SS[4] = { + { /* cs0 */ + FSL_DDR_ODT_OTHER_DIMM, + FSL_DDR_ODT_OTHER_DIMM, + DDR2_RTT_75_OHM, + DDR2_RTT_OFF + }, + {0, 0, 0, 0}, + { /* cs2 */ + FSL_DDR_ODT_OTHER_DIMM, + FSL_DDR_ODT_OTHER_DIMM, + DDR2_RTT_75_OHM, + DDR2_RTT_OFF + }, + {0, 0, 0, 0} +}; + +static const struct dynamic_odt dual_D0[4] = { + { /* cs0 */ + FSL_DDR_ODT_NEVER, + FSL_DDR_ODT_ALL, + DDR2_RTT_150_OHM, + DDR2_RTT_OFF + }, + { /* cs1 */ + FSL_DDR_ODT_NEVER, + FSL_DDR_ODT_NEVER, + DDR2_RTT_OFF, + DDR2_RTT_OFF + }, + {0, 0, 0, 0}, + {0, 0, 0, 0} +}; + +static const struct dynamic_odt dual_0D[4] = { + {0, 0, 0, 0}, + {0, 0, 0, 0}, + { /* cs2 */ + FSL_DDR_ODT_NEVER, + FSL_DDR_ODT_ALL, + DDR2_RTT_150_OHM, + DDR2_RTT_OFF + }, + { /* cs3 */ + FSL_DDR_ODT_NEVER, + FSL_DDR_ODT_NEVER, + DDR2_RTT_OFF, + DDR2_RTT_OFF + } +}; + +static const struct dynamic_odt dual_S0[4] = { + { /* cs0 */ + FSL_DDR_ODT_NEVER, + FSL_DDR_ODT_CS, + DDR2_RTT_150_OHM, + DDR2_RTT_OFF + }, + {0, 0, 0, 0}, + {0, 0, 0, 0}, + {0, 0, 0, 0} + +}; + +static const struct dynamic_odt dual_0S[4] = { + {0, 0, 0, 0}, + {0, 0, 0, 0}, + { /* cs2 */ + FSL_DDR_ODT_NEVER, + FSL_DDR_ODT_CS, + DDR2_RTT_150_OHM, + DDR2_RTT_OFF + }, + {0, 0, 0, 0} + +}; + +static const struct dynamic_odt odt_unknown[4] = { + { /* cs0 */ + FSL_DDR_ODT_NEVER, + FSL_DDR_ODT_CS, + DDR2_RTT_75_OHM, + DDR2_RTT_OFF + }, + { /* cs1 */ + FSL_DDR_ODT_NEVER, + FSL_DDR_ODT_NEVER, + DDR2_RTT_OFF, + DDR2_RTT_OFF + }, + { /* cs2 */ + FSL_DDR_ODT_NEVER, + FSL_DDR_ODT_CS, + DDR2_RTT_75_OHM, + DDR2_RTT_OFF + }, + { /* cs3 */ + FSL_DDR_ODT_NEVER, + FSL_DDR_ODT_NEVER, + DDR2_RTT_OFF, + DDR2_RTT_OFF + } +}; +#endif unsigned int populate_memctl_options(int all_DIMMs_registered, memctl_options_t *popts, dimm_params_t *pdimm, @@ -271,7 +483,7 @@ unsigned int populate_memctl_options(int all_DIMMs_registered, unsigned int i; char buffer[HWCONFIG_BUFFER_SIZE]; char *buf = NULL; - const dynamic_odt_t *pdodt = odt_unknown; + const struct dynamic_odt *pdodt = odt_unknown; ulong ddr_freq; /* @@ -337,7 +549,7 @@ unsigned int populate_memctl_options(int all_DIMMs_registered, /* Pick chip-select local options. */ for (i = 0; i < CONFIG_CHIP_SELECTS_PER_CTRL; i++) { -#if defined(CONFIG_FSL_DDR3) +#if defined(CONFIG_FSL_DDR3) || defined(CONFIG_FSL_DDR2) popts->cs_local_opts[i].odt_rd_cfg = pdodt[i].odt_rd_cfg; popts->cs_local_opts[i].odt_wr_cfg = pdodt[i].odt_wr_cfg; popts->cs_local_opts[i].odt_rtt_norm = pdodt[i].odt_rtt_norm; diff --git a/arch/powerpc/include/asm/fsl_ddr_sdram.h b/arch/powerpc/include/asm/fsl_ddr_sdram.h index 5b6e8d9830f..93639ba8516 100644 --- a/arch/powerpc/include/asm/fsl_ddr_sdram.h +++ b/arch/powerpc/include/asm/fsl_ddr_sdram.h @@ -31,6 +31,11 @@ #define DDR3_RTT_20_OHM 4 /* RTT_Nom = RZQ/12 */ #define DDR3_RTT_30_OHM 5 /* RTT_Nom = RZQ/8 */ +#define DDR2_RTT_OFF 0 +#define DDR2_RTT_75_OHM 1 +#define DDR2_RTT_150_OHM 2 +#define DDR2_RTT_50_OHM 3 + #if defined(CONFIG_FSL_DDR1) #define FSL_DDR_MIN_TCKE_PULSE_WIDTH_DDR (1) typedef ddr1_spd_eeprom_t generic_spd_eeprom_t; diff --git a/doc/README.fsl-ddr b/doc/README.fsl-ddr index c1ee0a68a8b..abfb7f192de 100644 --- a/doc/README.fsl-ddr +++ b/doc/README.fsl-ddr @@ -170,3 +170,55 @@ Single slot system Reference http://www.xrosstalkmag.com/mag_issues/xrosstalk_oct08_final.pdf http://download.micron.com/pdf/technotes/ddr3/tn4108_ddr3_design_guide.pdf + + +Table for ODT for DDR2 +====================== +Two slots system ++-----------------------+----------+---------------+-----------------------------+-----------------------------+ +| Configuration | |DRAM controller| Slot 1 | Slot 2 | ++-----------+-----------+----------+-------+-------+--------------+--------------+--------------+--------------+ +| | | | | | Rank 1 | Rank 2 | Rank 1 | Rank 2 | ++ Slot 1 | Slot 2 |Write/Read| Write | Read |-------+------+-------+------+-------+------+-------+------+ +| | | | | | Write | Read | Write | Read | Write | Read | Write | Read | ++-----------+-----------+----------+-------+-------+-------+------+-------+------+-------+------+-------+------+ +| | | Slot 1 | off | 150 | off | off | off | off | 75 | 75 | off | off | +| Dual Rank | Dual Rank |----------+-------+-------+-------+------+-------+------+-------+------+-------+------+ +| | | Slot 2 | off | 150 | 75 | 75 | off | off | off | off | off | off | ++-----------+-----------+----------+-------+-------+-------+------+-------+------+-------+------+-------+------+ +| | | Slot 1 | off | 150 | off | off | off | off | 75 | 75 | | | +| Dual Rank |Single Rank|----------+-------+-------+-------+------+-------+------+-------+------+-------+------+ +| | | Slot 2 | off | 150 | 75 | 75 | off | off | off | off | | | ++-----------+-----------+----------+-------+-------+-------+------+-------+------+-------+------+-------+------+ +| | | Slot 1 | off | 150 | off | off | | | 75 | 75 | off | off | +|Single Rank| Dual Rank |----------+-------+-------+-------+------+-------+------+-------+------+-------+------+ +| | | Slot 2 | off | 150 | 75 | 75 | | | off | off | off | off | ++-----------+-----------+----------+-------+-------+-------+------+-------+------+-------+------+-------+------+ +| | | Slot 1 | off | 150 | off | off | | | 75 | 75 | | | +|Single Rank|Single Rank|----------+-------+-------+-------+------+-------+------+-------+------+-------+------+ +| | | Slot 2 | off | 150 | 75 | 75 | | | off | off | | | ++-----------+-----------+----------+-------+-------+-------+------+-------+------+-------+------+-------+------+ +| Dual Rank | Empty | Slot 1 | off | 75 | 150 | off | off | off | | | | | ++-----------+-----------+----------+-------+-------+-------+------+-------+------+-------+------+-------+------+ +| Empty | Dual Rank | Slot 2 | off | 75 | | | | | 150 | off | off | off | ++-----------+-----------+----------+-------+-------+-------+------+-------+------+-------+------+-------+------+ +|Single Rank| Empty | Slot 1 | off | 75 | 150 | off | | | | | | | ++-----------+-----------+----------+-------+-------+-------+------+-------+------+-------+------+-------+------+ +| Empty |Single Rank| Slot 2 | off | 75 | | | | | 150 | off | | | ++-----------+-----------+----------+-------+-------+-------+------+-------+------+-------+------+-------+------+ + +Single slot system ++-------------+------------+---------------+-----------------------------+ +| | |DRAM controller| Rank 1 | Rank 2 | +|Configuration| Write/Read |-------+-------+-------+------+-------+------+ +| | | Write | Read | Write | Read | Write | Read | ++-------------+------------+-------+-------+-------+------+-------+------+ +| | R1 | off | 75 | 150 | off | off | off | +| Dual Rank |------------+-------+-------+-------+------+-------+------+ +| | R2 | off | 75 | 150 | off | off | off | ++-------------+------------+-------+-------+-------+------+-------+------+ +| Single Rank | R1 | off | 75 | 150 | off | ++-------------+------------+-------+-------+-------+------+ + +Reference http://www.samsung.com/global/business/semiconductor/products/dram/downloads/applicationnote/ddr2_odt_control_200603.pdf +