rockchip: rk3368: add sdram driver for U-Boot

Add sdram driver in U-Boot for get the correct sdram size from
sys_reg, so that U-Boot can co-work with Rockchip loader or SPL
to get different dram capability and then tell the kernel.

Signed-off-by: Kever Yang <kever.yang@rock-chips.com>
Reviewed-by: Philipp Tomsich <philipp.tomsich@theobroma-systems.com>

arch/arm/include/asm/arch-rockchip/grf_rk3368.h

@@ -92,8 +92,10 @@ struct rk3368_pmu_grf {
 	u32 gpio0d_drv;
 	u32 gpio0l_sr;
 	u32 gpio0h_sr;
+	u32 reserved[(0x200 - 0x34) / 4 - 1];
+	u32 os_reg[4];
 };
-check_member(rk3368_pmu_grf, gpio0h_sr, 0x34);
+check_member(rk3368_pmu_grf, os_reg[3], 0x20c);
 
 /*GRF_GPIO0C_IOMUX*/
 enum {

arch/arm/mach-rockchip/rk3368/Makefile

@@ -5,4 +5,5 @@
 #
 obj-y		+= clk_rk3368.o
 obj-y		+= rk3368.o
+obj-y 		+= sdram_rk3368.o
 obj-y 		+= syscon_rk3368.o

arch/arm/mach-rockchip/rk3368/sdram_rk3368.c

@@ -0,0 +1,60 @@
+/*
+ * (C) Copyright 2016 Rockchip Electronics Co., Ltd.
+ *
+ * SPDX-License-Identifier:     GPL-2.0
+ */
+
+#include <common.h>
+#include <dm.h>
+#include <ram.h>
+#include <syscon.h>
+#include <asm/arch/clock.h>
+#include <asm/arch/grf_rk3368.h>
+#include <asm/arch/sdram_common.h>
+
+DECLARE_GLOBAL_DATA_PTR;
+struct dram_info {
+	struct ram_info info;
+	struct rk3368_pmu_grf *pmugrf;
+};
+
+static int rk3368_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 rk3368_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 rk3368_dmc_ops = {
+	.get_info = rk3368_dmc_get_info,
+};
+
+
+static const struct udevice_id rk3368_dmc_ids[] = {
+	{ .compatible = "rockchip,rk3368-dmc" },
+	{ }
+};
+
+U_BOOT_DRIVER(dmc_rk3368) = {
+	.name = "rockchip_rk3368_dmc",
+	.id = UCLASS_RAM,
+	.of_match = rk3368_dmc_ids,
+	.ops = &rk3368_dmc_ops,
+	.probe = rk3368_dmc_probe,
+	.priv_auto_alloc_size = sizeof(struct dram_info),
+};