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-rw-r--r--arch/powerpc/cpu/mpc8xxx/ddr/lc_common_dimm_params.c3
-rw-r--r--arch/powerpc/cpu/mpc8xxx/ddr/options.c244
-rw-r--r--arch/powerpc/include/asm/fsl_ddr_sdram.h5
-rw-r--r--doc/README.fsl-ddr52
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 8132e68d9..20c7db03e 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 89dc479a3..4dc748b95 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 5b6e8d983..93639ba85 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 c1ee0a68a..abfb7f192 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
+
generated by cgit v1.2.3-70-g09d2 (git 2.51.2) at 2025-10-31 03:16:59 +0000