diff options
Diffstat (limited to 'arch/sh/boards/se/7343/led.c')
-rw-r--r-- | arch/sh/boards/se/7343/led.c | 46 |
1 files changed, 46 insertions, 0 deletions
diff --git a/arch/sh/boards/se/7343/led.c b/arch/sh/boards/se/7343/led.c new file mode 100644 index 000000000000..6a439cf83e46 --- /dev/null +++ b/arch/sh/boards/se/7343/led.c @@ -0,0 +1,46 @@ +/* + * arch/sh/boards/se/7343/led.c + * + */ + +#include <linux/config.h> +#include <linux/sched.h> +#include <asm/mach/se7343.h> + +/* Cycle the LED's in the clasic Knightrider/Sun pattern */ +void heartbeat_7343se(void) +{ + static unsigned int cnt = 0, period = 0; + volatile unsigned short *p = (volatile unsigned short *) PA_LED; + static unsigned bit = 0, up = 1; + + cnt += 1; + if (cnt < period) { + return; + } + + cnt = 0; + + /* Go through the points (roughly!): + * f(0)=10, f(1)=16, f(2)=20, f(5)=35,f(inf)->110 + */ + period = 110 - ((300 << FSHIFT) / ((avenrun[0] / 5) + (3 << FSHIFT))); + + if (up) { + if (bit == 7) { + bit--; + up = 0; + } else { + bit++; + } + } else { + if (bit == 0) { + bit++; + up = 1; + } else { + bit--; + } + } + *p = 1 << (bit + LED_SHIFT); + +} |