rockchip: add timer driver

some rockchip soc will not include lib/timer.c in SPL stage,
so implement timer driver for some soc can use us delay function in SPL.

Signed-off-by: Lin Huang <hl@rock-chips.com>
Acked-by: Simon Glass <sjg@chromium.org>

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

@@ -0,0 +1,22 @@
+/*
+ * (C) Copyright 2015 Rockchip Electronics Co., Ltd
+ *
+ * SPDX-License-Identifier:     GPL-2.0+
+ */
+
+#ifndef __ASM_ARCH_TIMER_H
+#define __ASM_ARCH_TIMER_H
+
+struct rk_timer {
+	unsigned int timer_load_count0;
+	unsigned int timer_load_count1;
+	unsigned int timer_curr_value0;
+	unsigned int timer_curr_value1;
+	unsigned int timer_ctrl_reg;
+	unsigned int timer_int_status;
+};
+
+void rockchip_timer_init(void);
+void rockchip_udelay(unsigned int usec);
+
+#endif

arch/arm/mach-rockchip/Makefile

@@ -10,4 +10,5 @@ else
 obj-y += board.o
 endif
 obj-y += common.o
+obj-y += rk_timer.o
 obj-$(CONFIG_ROCKCHIP_RK3288) += rk3288/

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

@@ -18,6 +18,7 @@
 #include <asm/arch/hardware.h>
 #include <asm/arch/periph.h>
 #include <asm/arch/sdram.h>
+#include <asm/arch/timer.h>
 #include <dm/pinctrl.h>
 #include <dm/root.h>
 #include <dm/test.h>
@@ -110,24 +111,6 @@ static void configure_l2ctlr(void)
 	write_l2ctlr(l2ctlr);
 }
 
-struct rk3288_timer {
-	u32 timer_load_count0;
-	u32 timer_load_count1;
-	u32 timer_curr_value0;
-	u32 timer_curr_value1;
-	u32 timer_ctrl_reg;
-	u32 timer_int_status;
-};
-
-void init_timer(void)
-{
-	struct rk3288_timer * const timer7_ptr = (void *)TIMER7_BASE;
-
-	writel(0xffffffff, &timer7_ptr->timer_load_count0);
-	writel(0xffffffff, &timer7_ptr->timer_load_count1);
-	writel(1, &timer7_ptr->timer_ctrl_reg);
-}
-
 static int configure_emmc(struct udevice *pinctrl)
 {
 	struct gpio_desc desc;
@@ -197,7 +180,7 @@ void board_init_f(ulong dummy)
 		hang();
 	}
 
-	init_timer();
+	rockchip_timer_init();
 	configure_l2ctlr();
 
 	ret = uclass_get_device(UCLASS_CLK, 0, &dev);

arch/arm/mach-rockchip/rk_timer.c

@@ -0,0 +1,48 @@
+/*
+ * (C) Copyright 2015 Rockchip Electronics Co., Ltd
+ *
+ * SPDX-License-Identifier:     GPL-2.0+
+ */
+
+#include <asm/arch/timer.h>
+#include <asm/io.h>
+#include <common.h>
+#include <linux/types.h>
+
+struct rk_timer * const timer_ptr = (void *)CONFIG_SYS_TIMER_BASE;
+
+static uint64_t rockchip_get_ticks(void)
+{
+	uint64_t timebase_h, timebase_l;
+
+	timebase_l = readl(&timer_ptr->timer_curr_value0);
+	timebase_h = readl(&timer_ptr->timer_curr_value1);
+
+	return timebase_h << 32 | timebase_l;
+}
+
+static uint64_t usec_to_tick(unsigned int usec)
+{
+	uint64_t tick = usec;
+	tick *= CONFIG_SYS_TIMER_RATE / (1000 * 1000);
+	return tick;
+}
+
+void rockchip_udelay(unsigned int usec)
+{
+	uint64_t tmp;
+
+	/* get timestamp */
+	tmp = rockchip_get_ticks() + usec_to_tick(usec);
+
+	/* loop till event */
+	while (rockchip_get_ticks() < tmp+1)
+		;
+}
+
+void rockchip_timer_init(void)
+{
+	writel(0xffffffff, &timer_ptr->timer_load_count0);
+	writel(0xffffffff, &timer_ptr->timer_load_count1);
+	writel(1, &timer_ptr->timer_ctrl_reg);
+}

include/configs/rk3288_common.h

@@ -22,7 +22,8 @@
 #define CONFIG_DISPLAY_BOARDINFO
 
 #define CONFIG_SYS_TIMER_RATE		(24 * 1000 * 1000)
-#define CONFIG_SYS_TIMER_COUNTER	(TIMER7_BASE + 8)
+#define	CONFIG_SYS_TIMER_BASE		0xff810020 /* TIMER7 */
+#define CONFIG_SYS_TIMER_COUNTER	(CONFIG_SYS_TIMER_BASE + 8)
 
 #define CONFIG_SPL_FRAMEWORK
 #define CONFIG_SPL_LIBCOMMON_SUPPORT