[PATCH 15/20] ram: rockchip: Add rk3576 ddr driver support

[Heiko Stuebner]

Add ddr driver for rk3576 to get the ram capacity.

Signed-off-by: Heiko Stuebner <heiko at sntech.de>
---
 drivers/ram/rockchip/Makefile       |  1 +
 drivers/ram/rockchip/sdram_rk3576.c | 65 +++++++++++++++++++++++++++++
 2 files changed, 66 insertions(+)
 create mode 100644 drivers/ram/rockchip/sdram_rk3576.c

diff --git a/drivers/ram/rockchip/Makefile b/drivers/ram/rockchip/Makefile
index 36dc0500dab..442fe73deb6 100644
--- a/drivers/ram/rockchip/Makefile
+++ b/drivers/ram/rockchip/Makefile
@@ -14,6 +14,7 @@ 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_RK3568) += sdram_rk3568.o
+obj-$(CONFIG_ROCKCHIP_RK3576) += sdram_rk3576.o
 obj-$(CONFIG_ROCKCHIP_RK3588) += sdram_rk3588.o
 obj-$(CONFIG_ROCKCHIP_RV1126) += sdram_rv1126.o sdram_pctl_px30.o
 obj-$(CONFIG_ROCKCHIP_SDRAM_COMMON) += sdram_common.o
diff --git a/drivers/ram/rockchip/sdram_rk3576.c b/drivers/ram/rockchip/sdram_rk3576.c
new file mode 100644
index 00000000000..fa4187a5860
--- /dev/null
+++ b/drivers/ram/rockchip/sdram_rk3576.c
@@ -0,0 +1,65 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * (C) Copyright 2024 Rockchip Electronics Co., Ltd.
+ */
+
+#include <config.h>
+#include <dm.h>
+#include <ram.h>
+#include <syscon.h>
+#include <asm/arch-rockchip/clock.h>
+#include <asm/arch-rockchip/grf_rk3576.h>
+#include <asm/arch-rockchip/sdram.h>
+
+struct dram_info {
+	struct ram_info info;
+	struct rk3576_pmu1grf *pmugrf;
+};
+
+static int rk3576_dmc_probe(struct udevice *dev)
+{
+	struct dram_info *priv = dev_get_priv(dev);
+
+	priv->pmugrf = syscon_get_first_range(ROCKCHIP_SYSCON_PMUGRF);
+
+	/*
+	 * On a 16GB board the DDR ATAG reports:
+	 * start 0x40000000, size 0x400000000
+	 * While the size value from the pmugrf below reports
+	 * pmugrf->osreg2: 0x400000000
+	 * pmugrf->osreg4:  0x10000000
+	 * So it seems only osreg2 is responsible for the ram size.
+	 */
+	priv->info.base = CFG_SYS_SDRAM_BASE;
+	priv->info.size =
+		rockchip_sdram_size((phys_addr_t)&priv->pmugrf->os_reg[2]);
+
+	return 0;
+}
+
+static int rk3576_dmc_get_info(struct udevice *dev, struct ram_info *info)
+{
+	struct dram_info *priv = dev_get_priv(dev);
+
+	*info = priv->info;
+
+	return 0;
+}
+
+static struct ram_ops rk3576_dmc_ops = {
+	.get_info = rk3576_dmc_get_info,
+};
+
+static const struct udevice_id rk3576_dmc_ids[] = {
+	{ .compatible = "rockchip,rk3576-dmc" },
+	{ }
+};
+
+U_BOOT_DRIVER(dmc_rk3576) = {
+	.name = "rockchip_rk3576_dmc",
+	.id = UCLASS_RAM,
+	.of_match = rk3576_dmc_ids,
+	.ops = &rk3576_dmc_ops,
+	.probe = rk3576_dmc_probe,
+	.priv_auto = sizeof(struct dram_info),
+};
-- 
2.45.2