rockchip: rk3368: spl: add SPL support

Adds SPL support for the RK3368 (assuming that our TPL stage has
initialised DRAM and set up the memory firewall).

Signed-off-by: Philipp Tomsich <philipp.tomsich@theobroma-systems.com>
Reviewed-by: Simon Glass <sjg@chromium.org>

arch/arm/mach-rockchip/Makefile

@@ -18,7 +18,7 @@ obj-spl-$(CONFIG_ROCKCHIP_RK3036) += rk3036-board-spl.o
 obj-spl-$(CONFIG_ROCKCHIP_RK3188) += rk3188-board-spl.o
 obj-spl-$(CONFIG_ROCKCHIP_RK322X) += rk322x-board-spl.o
 obj-spl-$(CONFIG_ROCKCHIP_RK3288) += rk3288-board-spl.o
-obj-spl-$(CONFIG_ROCKCHIP_RK3368) += rk3368-board-spl.o
+obj-spl-$(CONFIG_ROCKCHIP_RK3368) += rk3368-board-spl.o spl-boot-order.o
 obj-spl-$(CONFIG_ROCKCHIP_RK3399) += rk3399-board-spl.o spl-boot-order.o
 
 ifeq ($(CONFIG_SPL_BUILD)$(CONFIG_TPL_BUILD),)

arch/arm/mach-rockchip/rk3368-board-spl.c

+/*
+ * (C) Copyright 2017 Theobroma Systems Design und Consulting GmbH
+ *
+ * SPDX-License-Identifier:     GPL-2.0+
+ */
+
+#include <common.h>
+#include <debug_uart.h>
+#include <dm.h>
+#include <dm/pinctrl.h>
+#include <ram.h>
+#include <spl.h>
+#include <asm/io.h>
+#include <asm/arch/cru_rk3368.h>
+#include <asm/arch/grf_rk3368.h>
+#include <asm/arch/hardware.h>
+#include <asm/arch/periph.h>
+#include <asm/arch/timer.h>
+
+DECLARE_GLOBAL_DATA_PTR;
+
+/*
+ * The ARMv8 generic timer uses the STIMER1 as its clock-source.
+ * Set up the STIMER1 to free-running (i.e. auto-reload) to start
+ * the generic timer counting (if we don't do this, udelay will not
+ * work and block indefinitively).
+ */
+static void secure_timer_init(void)
+{
+	struct rk_timer * const stimer1 =
+		(struct rk_timer * const)0xff830020;
+	const u32 TIMER_EN = BIT(0);
+
+	writel(~0u, &stimer1->timer_load_count0);
+	writel(~0u, &stimer1->timer_load_count1);
+	writel(TIMER_EN, &stimer1->timer_ctrl_reg);
+}
+
+void board_debug_uart_init(void)
+{
+}
+
+void board_init_f(ulong dummy)
+{
+	struct udevice *pinctrl;
+	struct udevice *dev;
+	int ret;
+
+	ret = spl_early_init();
+	if (ret) {
+		debug("spl_early_init() failed: %d\n", ret);
+		hang();
+	}
+
+	/* Make sure the ARMv8 generic timer counts */
+	secure_timer_init();
+
+	/* Set up our preloader console */
+	ret = uclass_get_device(UCLASS_PINCTRL, 0, &pinctrl);
+	if (ret) {
+		error("%s: pinctrl init failed: %d\n", __func__, ret);
+		hang();
+	}
+
+	ret = pinctrl_request_noflags(pinctrl, PERIPH_ID_UART0);
+	if (ret) {
+		error("%s: failed to set up console UART\n", __func__);
+		hang();
+	}
+
+	preloader_console_init();
+
+	ret = uclass_get_device(UCLASS_RAM, 0, &dev);
+	if (ret) {
+		debug("DRAM init failed: %d\n", ret);
+		return;
+	}
+}
+
+u32 spl_boot_mode(const u32 boot_device)
+{
+	return MMCSD_MODE_RAW;
+}
+
+u32 spl_boot_device(void)
+{
+	return BOOT_DEVICE_MMC1;
+}
+
+#ifdef CONFIG_SPL_LOAD_FIT
+int board_fit_config_name_match(const char *name)
+{
+	/* Just empty function now - can't decide what to choose */
+	debug("%s: %s\n", __func__, name);
+
+	return 0;
+}
+#endif