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