baytrail: print dram configuration

After running the MRC blob print out some information
on the training: MRC version, number channels, DDR3
type, and DRAM frequency.

Example output:
MRC v0.90
2 channels of DDR3 @ 1066MHz

Apparently there are two dunit IOSF ports -- 1 for each
channel. However, certain registers really on live in
channel 0. Thus, there was some changes to dunit support
in the iosf area.

BUG=chrome-os-partner:22875
BRANCH=None
TEST=Built and booted bayleybay in different configs.

Change-Id: Ib306432b55f9222b4eb3d14b2467bc0e7617e24f
Signed-off-by: Aaron Durbin <adurbin@chromium.org>
Reviewed-on: https://chromium-review.googlesource.com/172770
Reviewed-by: Shawn Nematbakhsh <shawnn@chromium.org>
Reviewed-on: http://review.coreboot.org/4882
Tested-by: build bot (Jenkins)
Reviewed-by: Alexandru Gagniuc <mr.nuke.me@gmail.com>

1 files changed, 45 insertions, 0 deletions

diff --git a/src/soc/intel/baytrail/romstage/raminit.c b/src/soc/intel/baytrail/romstage/raminit.c
index cf9ccfd1d6..7bcd54fe01 100644
--- a/src/soc/intel/baytrail/romstage/raminit.c
+++ b/src/soc/intel/baytrail/romstage/raminit.c
@@ -26,6 +26,7 @@
 #include <baytrail/gpio.h>
 #include <baytrail/mrc_cache.h>
 #include <baytrail/iomap.h>
+#include <baytrail/iosf.h>
 #include <baytrail/pci_devs.h>
 #include <baytrail/romstage.h>
 
@@ -57,6 +58,48 @@ static void ABI_X86 send_to_console(unsigned char b)
 	console_tx_byte(b);
 }
 
+static void print_dram_info(void)
+{
+	const int mrc_ver_reg = 0xf0;
+	const uint32_t soc_dev = PCI_DEV(0, SOC_DEV, SOC_FUNC);
+	uint32_t reg;
+	int num_channels;
+	int speed;
+	uint32_t ch0;
+	uint32_t ch1;
+
+	reg = pci_read_config32(soc_dev, mrc_ver_reg);
+
+	printk(BIOS_INFO, "MRC v%d.%02d\n", (reg >> 8) & 0xff, reg & 0xff);
+
+	/* Number of channels enabled and DDR3 type. Determine number of
+	 * channels by keying of the rank enable bits [3:0]. * */
+	ch0 = iosf_dunit_ch0_read(DRP);
+	ch1 = iosf_dunit_ch1_read(DRP);
+	num_channels = 0;
+	if (ch0 & DRP_RANK_MASK)
+		num_channels++;
+	if (ch1 & DRP_RANK_MASK)
+		num_channels++;
+
+	printk(BIOS_INFO, "%d channels of %sDDR3 @ ", num_channels,
+	       (reg & (1 << 22)) ? "LP" : "");
+
+	/* DRAM frequency -- all channels run at same frequency. */
+	reg = iosf_dunit_read(DTR0);
+	switch (reg & 0x3) {
+	case 0:
+		speed = 800; break;
+	case 1:
+		speed = 1066; break;
+	case 2:
+		speed = 1333; break;
+	case 3:
+		speed = 1600; break;
+	}
+	printk(BIOS_INFO, "%dMHz\n", speed);
+}
+
 void raminit(struct mrc_params *mp, int prev_sleep_state)
 {
 	int ret;
@@ -87,6 +130,8 @@ void raminit(struct mrc_params *mp, int prev_sleep_state)
 
 	ret = mrc_entry(mp);
 
+	print_dram_info();
+
 	cbmem_initialize_empty();
 
 	printk(BIOS_DEBUG, "MRC Wrapper returned %d\n", ret);