[Cubieboard2 PATCH v1] Enable early LED support

[Cubieboard2 PATCH v1] Enable early LED support

[Javad Rahimi]

This patch removes the "status_led_init_done" global variable.
By removing that variable, it is possible
to use LEDs early in SPL, in architectures
where .BSS is placed in DRAM area. (For example A20 series)

Signed-off-by: Javad Rahimi <javad321javad@gmail.com>
---

Changes in v1:
- "state" variable is used as initialization flag
- Helper macros defined for initialization
- Initialization is checked at begining of LED operations

 drivers/misc/status_led.c | 26 +++++++++++++++-----------
 1 file changed, 15 insertions(+), 11 deletions(-)

diff --git a/drivers/misc/status_led.c b/drivers/misc/status_led.c
index a6e9c03a02..23d932ec6e 100644
--- a/drivers/misc/status_led.c
+++ b/drivers/misc/status_led.c
@@ -69,17 +69,22 @@ led_dev_t led_dev[] = {
 };
 
 #define MAX_LED_DEV	(sizeof(led_dev)/sizeof(led_dev_t))
+#define LED_INITIALIZED_BIT			0x8
+#define LED_STATE_MASK				0x3
 
-static int status_led_init_done = 0;
+#define LED_IS_INITIALIZED(x)		(!!((x) & LED_INITIALIZED_BIT))
+#define LED_INITIALIZE(x)			((x) |= (LED_INITIALIZED_BIT))
+#define LED_GET_STATE(x)			((x) & LED_STATE_MASK)
 
 void status_led_init(void)
 {
 	led_dev_t *ld;
 	int i;
 
-	for (i = 0, ld = led_dev; i < MAX_LED_DEV; i++, ld++)
+	for (i = 0, ld = led_dev; i < MAX_LED_DEV; i++, ld++) {
 		__led_init (ld->mask, ld->state);
-	status_led_init_done = 1;
+		LED_INITIALIZE(ld->state);
+	}
 }
 
 void status_led_tick(ulong timestamp)
@@ -87,11 +92,11 @@ void status_led_tick(ulong timestamp)
 	led_dev_t *ld;
 	int i;
 
-	if (!status_led_init_done)
-		status_led_init();
-
 	for (i = 0, ld = led_dev; i < MAX_LED_DEV; i++, ld++) {
 
+		if (!LED_IS_INITIALIZED(ld->state))
+			status_led_init();
+
 		if (ld->state != CONFIG_LED_STATUS_BLINKING)
 			continue;
 
@@ -99,7 +104,6 @@ void status_led_tick(ulong timestamp)
 			__led_toggle (ld->mask);
 			ld->cnt -= ld->period;
 		}
-
 	}
 }
 
@@ -110,12 +114,12 @@ void status_led_set(int led, int state)
 	if (led < 0 || led >= MAX_LED_DEV)
 		return;
 
-	if (!status_led_init_done)
-		status_led_init();
-
 	ld = &led_dev[led];
 
-	ld->state = state;
+	if (!LED_IS_INITIALIZED(ld->state))
+		status_led_init();
+
+	ld->state = LED_GET_STATE(ld->state);
 	if (state == CONFIG_LED_STATUS_BLINKING) {
 		ld->cnt = 0;		/* always start with full period    */
 		state = CONFIG_LED_STATUS_ON;	/* always start with LED _ON_ */
-- 
2.25.1