New patch to review for coreboot: e8eff3c samus: Add some code to print basic info from SPD

[Marc Jones]

Marc Jones ([e-mail]) just uploaded a new patch set to gerrit, which you can find at http://review.coreboot.org/7944

-gerrit

commit e8eff3c60bd87954b61a69188f1ba6a4c5d20733
Author: Duncan Laurie 
Date:   Wed May 14 16:09:16 2014 -0700

samus: Add some code to print basic info from SPD

The handling of LPDDR is a bit messy in Intel platforms.  There
    is no traditional SPD so instead one is created by hand from the
    provided datasheets.

These have varying (and sometimes unexpected) geometry and it can
    be important during bringup to know what configuration is being
    passed to the memory training code.

This could in theory be put in a more generic location, but for now
    this is the only board with LPDDR3 where I have found it valuable.

BUG=chrome-os-partner:28234
    TEST=Build and boot on samus, look for SPD details on the console.
    CQ-DEPEND=CL:199920
    CQ-DEPEND=CL:199921
    CQ-DEPEND=CL:199922
    CQ-DEPEND=CL:199943
    CQ-DEPEND=CL:*163751

Original-Change-Id: Ibce0187ceb77d37552ffa1b4a5935061d7019259
    Original-Signed-off-by: Duncan Laurie 
    Original-Reviewed-on: https://chromium-review.googlesource.com/199923
    (cherry picked from commit 3f36348dd7abc67048407f181065f1a99b3d0dab)
    Signed-off-by: Marc Jones

Change-Id: I830b09ad118dff801cbcbde62ff5b4e7c5bcae8a
---
 src/mainboard/google/samus/spd.c | 52 ++++++++++++++++++++++++++++++++++++++++
 src/mainboard/google/samus/spd.h | 10 ++++++++
 2 files changed, 62 insertions(+)

diff --git a/src/mainboard/google/samus/spd.c b/src/mainboard/google/samus/spd.c
index 61363f3..4371da9 100644
--- a/src/mainboard/google/samus/spd.c
+++ b/src/mainboard/google/samus/spd.c
@@ -27,6 +27,56 @@
 #include "gpio.h"
 #include "spd.h"

+static void mainboard_print_spd_info(uint8_t spd[])
+{
+	const int spd_banks[8] = {  8, 16, 32, 64, -1, -1, -1, -1 };
+	const int spd_capmb[8] = {  1,  2,  4,  8, 16, 32, 64,  0 };
+	const int spd_rows[8]  = { 12, 13, 14, 15, 16, -1, -1, -1 };
+	const int spd_cols[8]  = {  9, 10, 11, 12, -1, -1, -1, -1 };
+	const int spd_ranks[8] = {  1,  2,  3,  4, -1, -1, -1, -1 };
+	const int spd_devw[8]  = {  4,  8, 16, 32, -1, -1, -1, -1 };
+	const int spd_busw[8]  = {  8, 16, 32, 64, -1, -1, -1, -1 };
+	char spd_name[SPD_PART_LEN+1] = { 0 };
+
+	int banks = spd_banks[(spd[SPD_DENSITY_BANKS] >> 4) & 7];
+	int capmb = spd_capmb[spd[SPD_DENSITY_BANKS] & 7] * 256;
+	int rows  = spd_rows[(spd[SPD_ADDRESSING] >> 3) & 7];
+	int cols  = spd_cols[spd[SPD_ADDRESSING] & 7];
+	int ranks = spd_ranks[(spd[SPD_ORGANIZATION] >> 3) & 7];
+	int devw  = spd_devw[spd[SPD_ORGANIZATION] & 7];
+	int busw  = spd_busw[spd[SPD_BUS_DEV_WIDTH] & 7];
+
+	/* Module type */
+	printk(BIOS_INFO, "SPD: module type is ");
+	switch (spd[SPD_DRAM_TYPE]) {
+	case SPD_DRAM_DDR3:
+		printk(BIOS_INFO, "DDR3\n");
+		break;
+	case SPD_DRAM_LPDDR3:
+		printk(BIOS_INFO, "LPDDR3\n");
+		break;
+	default:
+		printk(BIOS_INFO, "Unknown (%02x)\n", spd[SPD_DRAM_TYPE]);
+		break;
+	}
+
+	/* Module Part Number */
+	memcpy(spd_name, &spd[SPD_PART_OFF], SPD_PART_LEN);
+	spd_name[SPD_PART_LEN] = 0;
+	printk(BIOS_INFO, "SPD: module part is %s\n", spd_name);
+
+	printk(BIOS_INFO, "SPD: banks %d, ranks %d, rows %d, columns %d, "
+	       "density %d Mb\n", banks, ranks, rows, cols, capmb);
+	printk(BIOS_INFO, "SPD: device width %d bits, bus width %d bits\n",
+	       devw, busw);
+
+	if (capmb > 0 && busw > 0 && devw > 0 && ranks > 0) {
+		/* SIZE = DENSITY / 8 * BUS_WIDTH / SDRAM_WIDTH * RANKS */
+		printk(BIOS_INFO, "SPD: module size is %u MB (per channel)\n",
+		       capmb / 8 * busw / devw * ranks);
+	}
+}
+
 /* Copy SPD data for on-board memory */
 void mainboard_fill_spd_data(struct pei_data *pei_data)
 {
@@ -66,4 +116,6 @@ void mainboard_fill_spd_data(struct pei_data *pei_data)
           ((char*)CBFS_SUBHEADER(spd_file)) + spd_index, SPD_LEN);
    memcpy(pei_data->spd_data[1][0],
           ((char*)CBFS_SUBHEADER(spd_file)) + spd_index, SPD_LEN);
+
+	mainboard_print_spd_info(pei_data->spd_data[0][0]);
 }
diff --git a/src/mainboard/google/samus/spd.h b/src/mainboard/google/samus/spd.h
index 0597ac3..98180fa 100644
--- a/src/mainboard/google/samus/spd.h
+++ b/src/mainboard/google/samus/spd.h
@@ -22,6 +22,16 @@

#define SPD_LEN			256

+#define SPD_DRAM_TYPE		2
+#define  SPD_DRAM_DDR3		0x0b
+#define  SPD_DRAM_LPDDR3	0xf1
+#define SPD_DENSITY_BANKS	4
+#define SPD_ADDRESSING		5
+#define SPD_ORGANIZATION	7
+#define SPD_BUS_DEV_WIDTH	8
+#define SPD_PART_OFF		128
+#define  SPD_PART_LEN		18
+
 /* Samus board memory configuration GPIOs */
 #define SPD_GPIO_BIT0		67
 #define SPD_GPIO_BIT1		68