New patch to review for coreboot: 8a329b5 baytrail: add dunit access and registers

[Aaron Durbin]

Aaron Durbin ([e-mail]) just uploaded a new patch set to gerrit, which you can find at http://review.coreboot.org/4853

-gerrit

commit 8a329b5a5b8e54176af0ebaa081f8782441d695f
Author: Aaron Durbin 
Date:   Mon Sep 23 14:17:35 2013 -0500

baytrail: add dunit access and registers

The dunit on baytrail is the dram unit. Provide a means
    to access the configuration registers there using the
    proper IOSF mechanisms.

BUG=chrome-os-partner:22875
    BRANCH=none
    TEST=Built and booted. Able to read dram registers.

Change-Id: I4d5c019720a7883fe93f3e1860bcd57ce2ea6542
    Signed-off-by: Aaron Durbin 
    Reviewed-on: https://chromium-review.googlesource.com/170490
---
 src/soc/intel/baytrail/baytrail/iosf.h | 16 ++++++++++++++++
 src/soc/intel/baytrail/iosf.c          | 21 +++++++++++++++++++++
 2 files changed, 37 insertions(+)

diff --git a/src/soc/intel/baytrail/baytrail/iosf.h b/src/soc/intel/baytrail/baytrail/iosf.h
index 6ff087b..444dc38 100644
--- a/src/soc/intel/baytrail/baytrail/iosf.h
+++ b/src/soc/intel/baytrail/baytrail/iosf.h
@@ -51,6 +51,8 @@

uint32_t iosf_bunit_read(int reg);
 void iosf_bunit_write(int reg, uint32_t val);
+uint32_t iosf_dunit_read(int reg);
+void iosf_dunit_write(int reg, uint32_t val);

/* IOSF ports. */
 #define IOSF_PORT_AUNIT		0x00 /* IO Arbiter unit */
@@ -106,6 +108,20 @@ void iosf_bunit_write(int reg, uint32_t val);
 #define BUNIT_SMRRH		0x2f
 # define BUNIT_SMRR_ENABLE	(1 << 31)

+/*
+ * DUNIT Registers.
+ */

+#define DRP			0x00
+# define DRP_CH0_RANK0_EN	(0x01 << 0)
+# define DRP_CH0_RANK1_EN	(0x01 << 1)
+# define DRP_CH1_RANK0_EN	(0x01 << 2)
+# define DRP_CH1_RANK1_EN	(0x01 << 3)
+#define DTR0			0x01
+# define DTR0_SPEED_MASK	0x03
+# define DTR0_SPEED_800		0x00
+# define DTR0_SPEED_1066	0x01
+# define DTR0_SPEED_1333	0x02
+# define DTR0_SPEED_1600	0x03

#endif /* _BAYTRAIL_IOSF_H_ */
diff --git a/src/soc/intel/baytrail/iosf.c b/src/soc/intel/baytrail/iosf.c
index 6d4cba9..2373d81 100644
--- a/src/soc/intel/baytrail/iosf.c
+++ b/src/soc/intel/baytrail/iosf.c
@@ -59,3 +59,24 @@ void iosf_bunit_write(int reg, uint32_t val)
    write_iosf_reg(MCR_REG, cr);
    write_iosf_reg(MDR_REG, val);
 }
+
+uint32_t iosf_dunit_read(int reg)
+{
+	uint32_t cr = IOSF_OPCODE(IOSF_OP_READ_SYSMEMC) |
+	              IOSF_PORT(IOSF_PORT_SYSMEMC) | IOSF_REG(reg) |
+	              IOSF_BYTE_EN;
+
+	write_iosf_reg(MCR_REG, cr);
+	return read_iosf_reg(MDR_REG);
+}
+
+void iosf_dunit_write(int reg, uint32_t val)
+{
+	uint32_t cr = IOSF_OPCODE(IOSF_OP_WRITE_SYSMEMC) |
+	              IOSF_PORT(IOSF_PORT_SYSMEMC) | IOSF_REG(reg) |
+	              IOSF_BYTE_EN;
+
+
+	write_iosf_reg(MCR_REG, cr);
+	write_iosf_reg(MDR_REG, val);
+}