| /**************************************************** |
| * 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 |
| |
