rockchip: ram: add dm-based sdram driver

sdram configuration happens outside of dm-infrastructure in special
tpl-code, so the sdram driver itself has just the function to read
back the sdram configuration and allow main uboot to handle dram sizes.

Signed-off-by: Heiko Stuebner <heiko@sntech.de>

2 files changed, 58 insertions, 0 deletions

diff --git a/drivers/ram/rockchip/Makefile b/drivers/ram/rockchip/Makefile
index feb1f82d00..a51df57411 100644
--- a/drivers/ram/rockchip/Makefile
+++ b/drivers/ram/rockchip/Makefile
@@ -5,6 +5,7 @@
 
 obj-$(CONFIG_RAM_ROCKCHIP_DEBUG) += sdram_debug.o
 obj-$(CONFIG_ROCKCHIP_RK3368) = dmc-rk3368.o
+obj-$(CONFIG_ROCKCHIP_PX30) = sdram_px30.o
 obj-$(CONFIG_ROCKCHIP_RK3128) = sdram_rk3128.o
 obj-$(CONFIG_ROCKCHIP_RK3188) = sdram_rk3188.o
 obj-$(CONFIG_ROCKCHIP_RK322X) = sdram_rk322x.o
diff --git a/drivers/ram/rockchip/sdram_px30.c b/drivers/ram/rockchip/sdram_px30.c
new file mode 100644
index 0000000000..2d3ec5615f
--- /dev/null
+++ b/drivers/ram/rockchip/sdram_px30.c
@@ -0,0 +1,57 @@
+// SPDX-License-Identifier: GPL-2.0+ OR BSD-3-Clause
+/*
+ * (C) Copyright 2017 Rockchip Electronics Co., Ltd.
+ */
+
+#include <common.h>
+#include <dm.h>
+#include <ram.h>
+#include <syscon.h>
+#include <asm/arch-rockchip/clock.h>
+#include <asm/arch-rockchip/grf_px30.h>
+#include <asm/arch-rockchip/sdram_common.h>
+
+struct dram_info {
+	struct ram_info info;
+	struct px30_pmugrf *pmugrf;
+};
+
+static int px30_dmc_probe(struct udevice *dev)
+{
+	struct dram_info *priv = dev_get_priv(dev);
+
+	priv->pmugrf = syscon_get_first_range(ROCKCHIP_SYSCON_PMUGRF);
+	debug("%s: grf=%p\n", __func__, priv->pmugrf);
+	priv->info.base = CONFIG_SYS_SDRAM_BASE;
+	priv->info.size = rockchip_sdram_size(
+				(phys_addr_t)&priv->pmugrf->os_reg[2]);
+
+	return 0;
+}
+
+static int px30_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 px30_dmc_ops = {
+	.get_info = px30_dmc_get_info,
+};
+
+static const struct udevice_id px30_dmc_ids[] = {
+	{ .compatible = "rockchip,px30-dmc" },
+	{ }
+};
+
+U_BOOT_DRIVER(dmc_px30) = {
+	.name = "rockchip_px30_dmc",
+	.id = UCLASS_RAM,
+	.of_match = px30_dmc_ids,
+	.ops = &px30_dmc_ops,
+	.probe = px30_dmc_probe,
+	.priv_auto_alloc_size = sizeof(struct dram_info),
+};