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/****************************************************
* LED1 ---- PG6 LED2 ---- PG7 *
* LED3 ---- PG8 LED4 ---- PG9 *
* LED5 ---- PG10 LED6 ---- PG11 *
****************************************************/
#include <linux/linkage.h>
#include <asm/blackfin.h>
/* All functions in this file save the registers they uses.
So there is no need to save any registers before calling them. */
.text;
/* Initialize LEDs. */
ENTRY(_led_init)
LINK 0;
[--SP] = P0;
[--SP] = R0;
[--SP] = R1;
[--SP] = R2;
R1 = (PG6|PG7|PG8|PG9|PG10|PG11)(Z);
R2 = ~R1;
P0.H = hi(PORTG_FER);
P0.L = lo(PORTG_FER);
R0 = W[P0](Z);
SSYNC;
R0 = R0 & R2;
W[P0] = R0.L;
SSYNC;
P0.H = hi(PORTG_DIR_SET);
P0.L = lo(PORTG_DIR_SET);
W[P0] = R1.L;
SSYNC;
P0.H = hi(PORTG_INEN);
P0.L = lo(PORTG_INEN);
R0 = W[P0](Z);
SSYNC;
R0 = R0 & R2;
W[P0] = R0.L;
SSYNC;
R2 = [SP++];
R1 = [SP++];
R0 = [SP++];
P0 = [SP++];
RTS;
.size _led_init, .-_led_init
/* Set one LED on. Leave other LEDs unchanged.
It expects the LED number passed through R0. */
ENTRY(_led_on)
LINK 0;
[--SP] = P0;
[--SP] = R1;
CALL _led_init;
R1 = 1;
R0 += 5;
R1 <<= R0;
P0.H = hi(PORTG_SET);
P0.L = lo(PORTG_SET);
W[P0] = R1.L;
SSYNC;
R1 = [SP++];
P0 = [SP++];
UNLINK;
RTS;
.size _led_on, .-_led_on
/* Set one LED off. Leave other LEDs unchanged. */
ENTRY(_led_off)
LINK 0;
[--SP] = P0;
[--SP] = R1;
CALL _led_init;
R1 = 1;
R0 += 5;
R1 <<= R0;
P0.H = hi(PORTG_CLEAR);
P0.L = lo(PORTG_CLEAR);
W[P0] = R1.L;
SSYNC;
R1 = [SP++];
P0 = [SP++];
UNLINK;
RTS;
.size _led_off, .-_led_off
/* Toggle one LED. Leave other LEDs unchanged. */
ENTRY(_led_toggle)
LINK 0;
[--SP] = P0;
[--SP] = R1;
CALL _led_init;
R1 = 1;
R0 += 5;
R1 <<= R0;
P0.H = hi(PORTG);
P0.L = lo(PORTG);
R0 = W[P0](Z);
SSYNC;
R0 = R0 ^ R1;
W[P0] = R0.L;
SSYNC;
R1 = [SP++];
P0 = [SP++];
UNLINK;
RTS;
.size _led_toggle, .-_led_toggle
/* Display the number using LEDs in binary format. */
ENTRY(_led_disp_num)
LINK 0;
[--SP] = P0;
[--SP] = R1;
[--SP] = R2;
CALL _led_init;
R1 = 0x3f(X);
R0 = R0 & R1;
R2 = 6(X);
R0 <<= R2;
R1 <<= R2;
P0.H = hi(PORTG);
P0.L = lo(PORTG);
R2 = W[P0](Z);
SSYNC;
R1 = ~R1;
R2 = R2 & R1;
R2 = R2 | R0;
W[P0] = R2.L;
SSYNC;
R2 = [SP++];
R1 = [SP++];
P0 = [SP++];
UNLINK;
RTS;
.size _led_disp_num, .-_led_disp_num
/* Toggle the number using LEDs in binary format. */
ENTRY(_led_toggle_num)
LINK 0;
[--SP] = P0;
[--SP] = R1;
[--SP] = R2;
CALL _led_init;
R1 = 0x3f(X);
R0 = R0 & R1;
R1 = 6(X);
R0 <<= R1;
P0.H = hi(PORTG);
P0.L = lo(PORTG);
R1 = W[P0](Z);
SSYNC;
R1 = R1 ^ R0;
W[P0] = R1.L;
SSYNC;
R2 = [SP++];
R1 = [SP++];
P0 = [SP++];
UNLINK;
RTS;
.size _led_toggle_num, .-_led_toggle_num
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