summaryrefslogtreecommitdiff
path: root/include/asm-ppc/fsl_ddr_dimm_params.h
diff options
context:
space:
mode:
Diffstat (limited to 'include/asm-ppc/fsl_ddr_dimm_params.h')
-rw-r--r--include/asm-ppc/fsl_ddr_dimm_params.h84
1 files changed, 84 insertions, 0 deletions
diff --git a/include/asm-ppc/fsl_ddr_dimm_params.h b/include/asm-ppc/fsl_ddr_dimm_params.h
new file mode 100644
index 0000000..c794eed
--- /dev/null
+++ b/include/asm-ppc/fsl_ddr_dimm_params.h
@@ -0,0 +1,84 @@
+/*
+ * Copyright 2008 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
+ * Version 2 as published by the Free Software Foundation.
+ */
+
+#ifndef DDR2_DIMM_PARAMS_H
+#define DDR2_DIMM_PARAMS_H
+
+/* Parameters for a DDR2 dimm computed from the SPD */
+typedef struct dimm_params_s {
+
+ /* DIMM organization parameters */
+ char mpart[19]; /* guaranteed null terminated */
+
+ unsigned int n_ranks;
+ unsigned long long rank_density;
+ unsigned long long capacity;
+ unsigned int data_width;
+ unsigned int primary_sdram_width;
+ unsigned int ec_sdram_width;
+ unsigned int registered_dimm;
+
+ /* SDRAM device parameters */
+ unsigned int n_row_addr;
+ unsigned int n_col_addr;
+ unsigned int edc_config; /* 0 = none, 1 = parity, 2 = ECC */
+ unsigned int n_banks_per_sdram_device;
+ unsigned int burst_lengths_bitmask; /* BL=4 bit 2, BL=8 = bit 3 */
+ unsigned int row_density;
+
+ /* used in computing base address of DIMMs */
+ unsigned long long base_address;
+
+ /* DIMM timing parameters */
+
+ /*
+ * SDRAM clock periods
+ * The range for these are 1000-10000 so a short should be sufficient
+ */
+ unsigned int tCKmin_X_ps;
+ unsigned int tCKmin_X_minus_1_ps;
+ unsigned int tCKmin_X_minus_2_ps;
+ unsigned int tCKmax_ps;
+
+ /* SPD-defined CAS latencies */
+ unsigned int caslat_X;
+ unsigned int caslat_X_minus_1;
+ unsigned int caslat_X_minus_2;
+
+ unsigned int caslat_lowest_derated; /* Derated CAS latency */
+
+ /* basic timing parameters */
+ unsigned int tRCD_ps;
+ unsigned int tRP_ps;
+ unsigned int tRAS_ps;
+
+ unsigned int tWR_ps; /* maximum = 63750 ps */
+ unsigned int tWTR_ps; /* maximum = 63750 ps */
+ unsigned int tRFC_ps; /* max = 255 ns + 256 ns + .75 ns
+ = 511750 ps */
+
+ unsigned int tRRD_ps; /* maximum = 63750 ps */
+ unsigned int tRC_ps; /* maximum = 254 ns + .75 ns = 254750 ps */
+
+ unsigned int refresh_rate_ps;
+
+ unsigned int tIS_ps; /* byte 32, spd->ca_setup */
+ unsigned int tIH_ps; /* byte 33, spd->ca_hold */
+ unsigned int tDS_ps; /* byte 34, spd->data_setup */
+ unsigned int tDH_ps; /* byte 35, spd->data_hold */
+ unsigned int tRTP_ps; /* byte 38, spd->trtp */
+ unsigned int tDQSQ_max_ps; /* byte 44, spd->tdqsq */
+ unsigned int tQHS_ps; /* byte 45, spd->tqhs */
+} dimm_params_t;
+
+extern unsigned int ddr_compute_dimm_parameters(
+ const generic_spd_eeprom_t *spd,
+ dimm_params_t *pdimm,
+ unsigned int dimm_number);
+
+#endif