mpc8xxx: DDR2/DDR3: Clean up DIMM-type switch statements

The numeric constants in the switch statements are replaced by #defines
added to the common ddr_spd.h header.  This dramatically improves the
readability of the switch statments.

In addition, a few of the longer lines were cleaned up, and the DDR2
type for an SO-RDIMM module was added to the DDR2 switch statement.

Signed-off-by: Kyle Moffett <Kyle.D.Moffett@boeing.com>
Cc: Andy Fleming <afleming@gmail.com>
Cc: Kim Phillips <kim.phillips@freescale.com>
Acked-by: York Sun <yorksun@freescale.com>
Signed-off-by: Kumar Gala <galak@kernel.crashing.org>

arch/powerpc/cpu/mpc8xxx/ddr/ddr2_dimm_params.c

@@ -250,24 +250,27 @@ ddr_compute_dimm_parameters(const ddr2_spd_eeprom_t *spd,
 	pdimm->primary_sdram_width = spd->primw;
 	pdimm->ec_sdram_width = spd->ecw;
 
-	/* FIXME: what about registered SO-DIMM? */
+	/* These are all the types defined by the JEDEC DDR2 SPD 1.3 spec */
 	switch (spd->dimm_type) {
-	case 0x01:	/* RDIMM */
-	case 0x10:	/* Mini-RDIMM */
-		pdimm->registered_dimm = 1; /* register buffered */
+	case DDR2_SPD_DIMMTYPE_RDIMM:
+	case DDR2_SPD_DIMMTYPE_72B_SO_RDIMM:
+	case DDR2_SPD_DIMMTYPE_MINI_RDIMM:
+		/* Registered/buffered DIMMs */
+		pdimm->registered_dimm = 1;
 		break;
 
-	case 0x02:	/* UDIMM */
-	case 0x04:	/* SO-DIMM */
-	case 0x08:	/* Micro-DIMM */
-	case 0x20:	/* Mini-UDIMM */
-		pdimm->registered_dimm = 0;	/* unbuffered */
+	case DDR2_SPD_DIMMTYPE_UDIMM:
+	case DDR2_SPD_DIMMTYPE_SO_DIMM:
+	case DDR2_SPD_DIMMTYPE_MICRO_DIMM:
+	case DDR2_SPD_DIMMTYPE_MINI_UDIMM:
+		/* Unbuffered DIMMs */
+		pdimm->registered_dimm = 0;
 		break;
 
+	case DDR2_SPD_DIMMTYPE_72B_SO_CDIMM:
 	default:
 		printf("unknown dimm_type 0x%02X\n", spd->dimm_type);
 		return 1;
-		break;
 	}
 
 	/* SDRAM device parameters */

arch/powerpc/cpu/mpc8xxx/ddr/ddr3_dimm_params.c

@@ -128,24 +128,32 @@ ddr_compute_dimm_parameters(const ddr3_spd_eeprom_t *spd,
 	pdimm->data_width = pdimm->primary_sdram_width
 			  + pdimm->ec_sdram_width;
 
-	switch (spd->module_type & 0xf) {
-	case 0x01:	/* RDIMM */
-	case 0x05:	/* Mini-RDIMM */
-		pdimm->registered_dimm = 1; /* register buffered */
+	/* These are the types defined by the JEDEC DDR3 SPD spec */
+	pdimm->mirrored_dimm = 0;
+	pdimm->registered_dimm = 0;
+	switch (spd->module_type & DDR3_SPD_MODULETYPE_MASK) {
+	case DDR3_SPD_MODULETYPE_RDIMM:
+	case DDR3_SPD_MODULETYPE_MINI_RDIMM:
+		/* Registered/buffered DIMMs */
+		pdimm->registered_dimm = 1;
 		for (i = 0; i < 16; i += 2) {
-			pdimm->rcw[i] = spd->mod_section.registered.rcw[i/2] & 0x0F;
-			pdimm->rcw[i+1] = (spd->mod_section.registered.rcw[i/2] >> 4) & 0x0F;
+			u8 rcw = spd->mod_section.registered.rcw[i/2];
+			pdimm->rcw[i]   = (rcw >> 0) & 0x0F;
+			pdimm->rcw[i+1] = (rcw >> 4) & 0x0F;
 		}
 		break;
-	case 0x02:	/* UDIMM */
-	case 0x03:	/* SO-DIMM */
-	case 0x04:	/* Micro-DIMM */
-	case 0x06:	/* Mini-UDIMM */
-		pdimm->registered_dimm = 0;	/* unbuffered */
+
+	case DDR3_SPD_MODULETYPE_UDIMM:
+	case DDR3_SPD_MODULETYPE_SO_DIMM:
+	case DDR3_SPD_MODULETYPE_MICRO_DIMM:
+	case DDR3_SPD_MODULETYPE_MINI_UDIMM:
+		/* Unbuffered DIMMs */
+		if (spd->mod_section.unbuffered.addr_mapping & 0x1)
+			pdimm->mirrored_dimm = 1;
 		break;
 
 	default:
-		printf("unknown dimm_type 0x%02X\n", spd->module_type);
+		printf("unknown module_type 0x%02X\n", spd->module_type);
 		return 1;
 	}
 
@@ -303,16 +311,5 @@ ddr_compute_dimm_parameters(const ddr3_spd_eeprom_t *spd,
 	pdimm->tFAW_ps = (((spd->tFAW_msb & 0xf) << 8) | spd->tFAW_min)
 			* mtb_ps;
 
-	/*
-	 * We need check the address mirror for unbuffered DIMM
-	 * If SPD indicate the address map mirror, The DDR controller
-	 * need care it.
-	 */
-	if ((spd->module_type == SPD_MODULETYPE_UDIMM) ||
-	    (spd->module_type == SPD_MODULETYPE_SODIMM) ||
-	    (spd->module_type == SPD_MODULETYPE_MICRODIMM) ||
-	    (spd->module_type == SPD_MODULETYPE_MINIUDIMM))
-		pdimm->mirrored_dimm = spd->mod_section.unbuffered.addr_mapping & 0x1;
-
 	return 0;
 }

common/ddr_spd.c

@@ -18,7 +18,7 @@ spd_check(const u8 *buf, u8 spd_rev, u8 spd_cksum)
 
 	/*
 	 * Check SPD revision supported
-	 * Rev 1.2 or less supported by this code
+	 * Rev 1.X or less supported by this code
 	 */
 	if (spd_rev >= 0x20) {
 		printf("SPD revision %02X not supported by this code\n",

include/ddr_spd.h

@@ -304,14 +304,24 @@ extern unsigned int ddr3_spd_check(const ddr3_spd_eeprom_t *spd);
 #define SPD_MEMTYPE_DDR2_FBDIMM_PROBE	(0x0A)
 #define SPD_MEMTYPE_DDR3	(0x0B)
 
-/*
- * Byte 3 Key Byte / Module Type for DDR3 SPD
- */
-#define SPD_MODULETYPE_RDIMM		(0x01)
-#define SPD_MODULETYPE_UDIMM		(0x02)
-#define SPD_MODULETYPE_SODIMM		(0x03)
-#define SPD_MODULETYPE_MICRODIMM	(0x04)
-#define SPD_MODULETYPE_MINIRDIMM	(0x05)
-#define SPD_MODULETYPE_MINIUDIMM	(0x06)
+/* DIMM Type for DDR2 SPD (according to v1.3) */
+#define DDR2_SPD_DIMMTYPE_UNDEFINED	(0x00)
+#define DDR2_SPD_DIMMTYPE_RDIMM		(0x01)
+#define DDR2_SPD_DIMMTYPE_UDIMM		(0x02)
+#define DDR2_SPD_DIMMTYPE_SO_DIMM	(0x04)
+#define DDR2_SPD_DIMMTYPE_72B_SO_CDIMM	(0x06)
+#define DDR2_SPD_DIMMTYPE_72B_SO_RDIMM	(0x07)
+#define DDR2_SPD_DIMMTYPE_MICRO_DIMM	(0x08)
+#define DDR2_SPD_DIMMTYPE_MINI_RDIMM	(0x10)
+#define DDR2_SPD_DIMMTYPE_MINI_UDIMM	(0x20)
+
+/* Byte 3 Key Byte / Module Type for DDR3 SPD */
+#define DDR3_SPD_MODULETYPE_MASK	(0x0f)
+#define DDR3_SPD_MODULETYPE_RDIMM	(0x01)
+#define DDR3_SPD_MODULETYPE_UDIMM	(0x02)
+#define DDR3_SPD_MODULETYPE_SO_DIMM	(0x03)
+#define DDR3_SPD_MODULETYPE_MICRO_DIMM	(0x04)
+#define DDR3_SPD_MODULETYPE_MINI_RDIMM	(0x05)
+#define DDR3_SPD_MODULETYPE_MINI_UDIMM	(0x06)
 
 #endif /* _DDR_SPD_H_ */