[PATCH v4 13/13] EDAC/synopsys: Add BT1 DDRC support

[Serge Semin]

Baikal-T1 SoC is equipped with the DW uMCTl2 DDRC 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 supports Sideband ECC add the
controller support to the DW uMCTL2 DDRC EDAC driver. The most of the
parameters listed 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 <fancer.lancer@xxxxxxxxx>

---

Changelog v4:
- Explicitly set snps_ddrc_info.dq_width for Baikal-T1 DDRC for better
  maintainability.
- Explicitly set sys_app_map.minsize to SZ_256M instead of using a helper
  macro DDR_MIN_SARSIZE.
---
 drivers/edac/synopsys_edac.c | 16 ++++++++++++++++
 1 file changed, 16 insertions(+)

diff --git a/drivers/edac/synopsys_edac.c b/drivers/edac/synopsys_edac.c
index e589aa9f7876..04cde79eb3f6 100644
--- a/drivers/edac/synopsys_edac.c
+++ b/drivers/edac/synopsys_edac.c
@@ -1349,6 +1349,21 @@ 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.dq_width = SNPS_DQ_32;
+	priv->info.hif_burst_len = SNPS_DDR_BL8;
+	priv->sys_app_map.minsize = SZ_256M;
+
+	return 0;
+}
+
 /**
  * snps_get_dtype - Return the controller memory width.
  * @mstr:	Master CSR value.
@@ -2476,6 +2491,7 @@ 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" },
 	{ }
 };
-- 
2.41.0