[PATCH 03/13] ram: rockchip: Add basic support for RK3528

[Jonas Karlman]

Add support for reading DRAM size information from PMUGRF os_reg18 reg.

Compared to most Rockchip SoCs the RK3528 use os_reg18 for DRAM info,
instead of os_reg2.

Signed-off-by: Jonas Karlman <jonas at kwiboo.se>
---
 arch/arm/mach-rockchip/sdram.c      |  3 ++-
 drivers/ram/rockchip/Makefile       |  1 +
 drivers/ram/rockchip/sdram_rk3528.c | 33 +++++++++++++++++++++++++++++
 3 files changed, 36 insertions(+), 1 deletion(-)
 create mode 100644 drivers/ram/rockchip/sdram_rk3528.c

diff --git a/arch/arm/mach-rockchip/sdram.c b/arch/arm/mach-rockchip/sdram.c
index 3193fc0aa1e8..caca6f917305 100644
--- a/arch/arm/mach-rockchip/sdram.c
+++ b/arch/arm/mach-rockchip/sdram.c
@@ -110,7 +110,8 @@ static int rockchip_dram_init_banksize(void)
 	u8 i, j;
 
 	if (!IS_ENABLED(CONFIG_ROCKCHIP_RK3588) &&
-	    !IS_ENABLED(CONFIG_ROCKCHIP_RK3568))
+	    !IS_ENABLED(CONFIG_ROCKCHIP_RK3568) &&
+	    !IS_ENABLED(CONFIG_ROCKCHIP_RK3528))
 		return -ENOTSUPP;
 
 	if (!IS_ENABLED(CONFIG_ROCKCHIP_EXTERNAL_TPL))
diff --git a/drivers/ram/rockchip/Makefile b/drivers/ram/rockchip/Makefile
index 36dc0500dab5..f222cc99f1e4 100644
--- a/drivers/ram/rockchip/Makefile
+++ b/drivers/ram/rockchip/Makefile
@@ -13,6 +13,7 @@ obj-$(CONFIG_ROCKCHIP_RK3288) = sdram_rk3288.o
 obj-$(CONFIG_ROCKCHIP_RK3308) = sdram_rk3308.o
 obj-$(CONFIG_ROCKCHIP_RK3328) = sdram_rk3328.o sdram_pctl_px30.o sdram_phy_px30.o
 obj-$(CONFIG_ROCKCHIP_RK3399) += sdram_rk3399.o
+obj-$(CONFIG_ROCKCHIP_RK3528) += sdram_rk3528.o
 obj-$(CONFIG_ROCKCHIP_RK3568) += sdram_rk3568.o
 obj-$(CONFIG_ROCKCHIP_RK3588) += sdram_rk3588.o
 obj-$(CONFIG_ROCKCHIP_RV1126) += sdram_rv1126.o sdram_pctl_px30.o
diff --git a/drivers/ram/rockchip/sdram_rk3528.c b/drivers/ram/rockchip/sdram_rk3528.c
new file mode 100644
index 000000000000..89d325bea667
--- /dev/null
+++ b/drivers/ram/rockchip/sdram_rk3528.c
@@ -0,0 +1,33 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+// Copyright Contributors to the U-Boot project.
+
+#include <dm.h>
+#include <ram.h>
+#include <asm/arch-rockchip/sdram.h>
+
+#define PMUGRF_BASE			0xff370000
+#define OS_REG18_REG			0x248
+
+static int rk3528_dmc_get_info(struct udevice *dev, struct ram_info *info)
+{
+	info->base = CFG_SYS_SDRAM_BASE;
+	info->size = rockchip_sdram_size(PMUGRF_BASE + OS_REG18_REG);
+
+	return 0;
+}
+
+static struct ram_ops rk3528_dmc_ops = {
+	.get_info = rk3528_dmc_get_info,
+};
+
+static const struct udevice_id rk3528_dmc_ids[] = {
+	{ .compatible = "rockchip,rk3528-dmc" },
+	{ }
+};
+
+U_BOOT_DRIVER(rockchip_rk3528_dmc) = {
+	.name = "rockchip_rk3528_dmc",
+	.id = UCLASS_RAM,
+	.of_match = rk3528_dmc_ids,
+	.ops = &rk3528_dmc_ops,
+};
-- 
2.48.1