[PATCH 13/13] EDAC/synopsys: Add Baikal-T1 DDRC support

Serge Semin
2022-08-22T19:23:05Z

Baikal-T1 SoC is equipped with the DW uMCTl2 DDRC of v2.61a with 32-bit
DQ-bus accepting DDR2/DDR3 SDRAMs of up to 2 ranks, 1:2 HIF/SDRAM clocks
rate ratio, HIF interface burst length of 8 Full DQ-bus words, 40-bit
System/Application address width and 128-bits data width, 3 System address
regions with block size 256MB. There is SEC/DED ECC capability with Scrub
(RMW) and Scrubber features.

Since the Baikal-T1 DDR controller is capable of the ECC let's add it to
the DW uMCTL2 DDRC EDAC driver. The most of the parameters above will be
autodetected except HIF burst length and SAR block size, which will be set
by means of the Baikal-T1-specific initialization method. The controller
compatible string "baikal,bt1-ddrc" will be used to attach the driver to
the kernel device. It's chosen in accordance with the just updated
DT-bindings.

Signed-off-by: Serge Semin <Sergey.Semin@baikalelectronics.ru>
---
drivers/edac/synopsys_edac.c | 15 +++++++++++++++
1 file changed, 15 insertions(+)

diff --git a/drivers/edac/synopsys_edac.c b/drivers/edac/synopsys_edac.c
index f86d1be2702a..9780f61ac84c 100644
--- a/drivers/edac/synopsys_edac.c
+++ b/drivers/edac/synopsys_edac.c
@@ -1342,6 +1342,20 @@ static int zynqmp_init_plat(struct snps_edac_priv *priv)
return 0;
}

+/*
+ * bt1_init_plat - Baikal-T1-specific platform initialization.
+ * @priv: DDR memory controller private data.
+ *
+ * Return: always zero.
+ */
+static int bt1_init_plat(struct snps_edac_priv *priv)
+{
+ priv->info.hif_burst_len = SNPS_DDR_BL8;
+ priv->sys_app_map.minsize = DDR_MIN_SARSIZE;
+
+ return 0;
+}
+
/**
* snps_get_dtype - Return the controller memory width.
* @mstr: Master CSR value.
@@ -2470,6 +2484,7 @@ static int snps_mc_remove(struct platform_device *pdev)

static const struct of_device_id snps_edac_match[] = {
{ .compatible = "xlnx,zynqmp-ddrc-2.40a", .data = zynqmp_init_plat },
+ { .compatible = "baikal,bt1-ddrc", .data = bt1_init_plat },
{ .compatible = "snps,ddrc-3.80a" },
{ }
};
--
2.35.1