Hi Ben,
On 12/11/15 10:04, Ben Chan wrote:
On Tue, Nov 10, 2015 at 2:24 AM, Lin Huang <h...@rock-chips.com> wrote:
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 <h...@rock-chips.com>
Acked-by: Simon Glass <s...@chromium.org>
---
Changes in v1: None
Changes in v2:
- add udelay function
Changes in v3:
- fix some coding style
Changes in v4: None
Changes in v5: None
arch/arm/include/asm/arch-rockchip/timer.h | 22 ++++++++++++++
arch/arm/mach-rockchip/Makefile | 1 +
arch/arm/mach-rockchip/board-spl.c | 21 ++-----------
arch/arm/mach-rockchip/rk_timer.c | 48 ++++++++++++++++++++++++++++++
include/configs/rk3288_common.h | 3 +-
5 files changed, 75 insertions(+), 20 deletions(-)
create mode 100644 arch/arm/include/asm/arch-rockchip/timer.h
create mode 100644 arch/arm/mach-rockchip/rk_timer.c
diff --git a/arch/arm/include/asm/arch-rockchip/timer.h
b/arch/arm/include/asm/arch-rockchip/timer.h
new file mode 100644
index 0000000..59444d4
--- /dev/null
+++ b/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 {
question: should these use sized integer type?
you mean use u32, i think unsigned int is the same with u32
+ unsigned int timer_load_count0;
nit: it may be clearer to use _l / _h suffix instead of 0 / 1
it is correspond to TRM register name, and it can easy to find
register in TRM.
+ 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 us);
+
+#endif
diff --git a/arch/arm/mach-rockchip/Makefile b/arch/arm/mach-rockchip/Makefile
index 5a4e383..abe03a8 100644
--- a/arch/arm/mach-rockchip/Makefile
+++ b/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/
diff --git a/arch/arm/mach-rockchip/board-spl.c
b/arch/arm/mach-rockchip/board-spl.c
index 28c3949..0426adf 100644
--- a/arch/arm/mach-rockchip/board-spl.c
+++ b/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);
diff --git a/arch/arm/mach-rockchip/rk_timer.c
b/arch/arm/mach-rockchip/rk_timer.c
new file mode 100644
index 0000000..ae693c0
--- /dev/null
+++ b/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 unsigned int usec_to_tick(unsigned long usec)
should probably use 'uint64_t' for 'tick' and the return value, and
use 'unsigned int' for 'usec'
Yes, you are right, will correct it next version.
+{
+ unsigned int tick = usec;
+ tick *= CONFIG_SYS_TIMER_RATE / (1000 * 1000);
+ return tick;
+}
+
+void rockchip_udelay(unsigned int us)
nit: perhaps use 'usec' instead of 'us' for consistency with usec_to_tick
Okay, will modify next version.
+{
+ uint64_t tmp;
+
+ /* get current timestamp */
nit: the comment is kind of misleadning as 'tmp' isn't the current timestamp
+ tmp = rockchip_get_ticks() + usec_to_tick(us);
+
+ /* 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);
+}
diff --git a/include/configs/rk3288_common.h b/include/configs/rk3288_common.h
index 36408b9..cdea6cb 100644
--- a/include/configs/rk3288_common.h
+++ b/include/configs/rk3288_common.h
@@ -23,7 +23,8 @@
#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 */
nit: the code around it seems to use a space instead of a tab after #define
oh, sorry, i will correct it next version.
+#define CONFIG_SYS_TIMER_COUNTER (CONFIG_SYS_TIMER_BASE + 8)
#define CONFIG_SPL_FRAMEWORK
#define CONFIG_SPL_LIBCOMMON_SUPPORT
--
1.9.1
--
Lin Huang
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