[PATCH 46/92] ram: rockchip: debug: Get the cs capacity

Jagan Teki
2019-06-11T14:50:49Z

Add code to get the channel capacity, this would help to
print the capacity of specific channel.

Here is sample print on LPDDR4, 50MHz channel 0
BW=32 Col=10 Bk=8 CS0 Row=15 CS1 Row=15 CS=2 Die BW=16 Size=2048MB

Signed-off-by: Jagan Teki <jagan-dyjBcgdgk7Pe9wHmmfpqLFaTQe2KTcn/@public.gmane.org>
Signed-off-by: YouMin Chen <cym-TNX95d0MmH7DzftRWevZcw@public.gmane.org>
---
drivers/ram/rockchip/sdram_debug.c | 46 +++++++++++++++++++++++++++++-
1 file changed, 45 insertions(+), 1 deletion(-)

diff --git a/drivers/ram/rockchip/sdram_debug.c b/drivers/ram/rockchip/sdram_debug.c
index 69a6f94a73..19e9225c12 100644
--- a/drivers/ram/rockchip/sdram_debug.c
+++ b/drivers/ram/rockchip/sdram_debug.c
@@ -33,10 +33,46 @@ void sdram_print_dram_type(unsigned char dramtype)
}
}

+/**
+ * cs = 0, cs0
+ * cs = 1, cs1
+ * cs => 2, cs0+cs1
+ * note: it didn't consider about row_3_4
+ */
+u64 sdram_get_cs_cap(struct sdram_cap_info *cap_info, u32 cs, u32 dram_type)
+{
+ u32 bg;
+ u64 cap[2];
+
+ if (dram_type == DDR4)
+ /* DDR4 8bit dram BG = 2(4bank groups),
+ * 16bit dram BG = 1 (2 bank groups)
+ */
+ bg = (cap_info->dbw == 0) ? 2 : 1;
+ else
+ bg = 0;
+
+ cap[0] = 1llu << (cap_info->bw + cap_info->col +
+ bg + cap_info->bk + cap_info->cs0_row);
+
+ if (cap_info->rank == 2)
+ cap[1] = 1llu << (cap_info->bw + cap_info->col +
+ bg + cap_info->bk + cap_info->cs1_row);
+ else
+ cap[1] = 0;
+
+ if (cs == 0)
+ return cap[0];
+ else if (cs == 1)
+ return cap[1];
+ else
+ return (cap[0] + cap[1]);
+}
+
void sdram_print_ddr_info(struct sdram_cap_info *cap_info,
struct sdram_base_params *base)
{
- u32 bg;
+ u32 bg, cap;

bg = (cap_info->dbw == 0) ? 2 : 1;

@@ -71,4 +107,12 @@ void sdram_print_ddr_info(struct sdram_cap_info *cap_info,

printascii(" Die BW=");
printdec(8 << cap_info->dbw);
+
+ cap = sdram_get_cs_cap(cap_info, 3, base->dramtype);
+ if (cap_info->row_3_4)
+ cap = cap * 3 / 4;
+
+ printascii(" Size=");
+ printdec(cap >> 20);
+ printascii("MB\n");
}
--
2.18.0.321.gffc6fa0e3