From 4c53df47302968fd6f90261d84c9d3c0f8e7bbc2 Mon Sep 17 00:00:00 2001 From: Aaron Durbin Date: Mon, 23 Sep 2013 14:17:35 -0500 Subject: 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 Reviewed-on: http://review.coreboot.org/4853 Tested-by: build bot (Jenkins) Reviewed-by: Stefan Reinauer --- src/soc/intel/baytrail/iosf.c | 21 +++++++++++++++++++++ 1 file changed, 21 insertions(+) (limited to 'src/soc/intel/baytrail/iosf.c') diff --git a/src/soc/intel/baytrail/iosf.c b/src/soc/intel/baytrail/iosf.c index 6d4cba9bb6..2373d81598 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); +} -- cgit v1.2.3