| Bryan Wu | 1394f03 | 2007-05-06 14:50:22 -0700 | [diff] [blame^] | 1 | /**************************************************** |
| 2 | * LED1 ---- PF6 LED2 ---- PF7 * |
| 3 | * LED3 ---- PF8 LED4 ---- PF9 * |
| 4 | * LED5 ---- PF10 LED6 ---- PF11 * |
| 5 | ****************************************************/ |
| 6 | |
| 7 | #include <linux/linkage.h> |
| 8 | #include <asm/blackfin.h> |
| 9 | |
| 10 | /* All functions in this file save the registers they uses. |
| 11 | So there is no need to save any registers before calling them. */ |
| 12 | |
| 13 | .text; |
| 14 | |
| 15 | /* Initialize LEDs. */ |
| 16 | |
| 17 | ENTRY(_led_init) |
| 18 | LINK 12; |
| 19 | [--SP] = P0; |
| 20 | [--SP] = R0; |
| 21 | [--SP] = R1; |
| 22 | [--SP] = R2; |
| 23 | R1 = PF6|PF7|PF8|PF9|PF10|PF11 (Z); |
| 24 | R2 = ~R1; |
| 25 | |
| 26 | P0.H = hi(PORTF_FER); |
| 27 | P0.L = lo(PORTF_FER); |
| 28 | R0 = W[P0](Z); |
| 29 | SSYNC; |
| 30 | R0 = R0 & R2; |
| 31 | W[P0] = R0.L; |
| 32 | SSYNC; |
| 33 | |
| 34 | P0.H = hi(PORTFIO_DIR); |
| 35 | P0.L = lo(PORTFIO_DIR); |
| 36 | R0 = W[P0](Z); |
| 37 | SSYNC; |
| 38 | R0 = R0 | R1; |
| 39 | W[P0] = R0.L; |
| 40 | SSYNC; |
| 41 | |
| 42 | P0.H = hi(PORTFIO_INEN); |
| 43 | P0.L = lo(PORTFIO_INEN); |
| 44 | R0 = W[P0](Z); |
| 45 | SSYNC; |
| 46 | R0 = R0 & R2; |
| 47 | W[P0] = R0.L; |
| 48 | SSYNC; |
| 49 | |
| 50 | R2 = [SP++]; |
| 51 | R1 = [SP++]; |
| 52 | R0 = [SP++]; |
| 53 | P0 = [SP++]; |
| 54 | UNLINK; |
| 55 | RTS; |
| 56 | .size _led_init, .-_led_init |
| 57 | |
| 58 | /* Set one LED on. Leave other LEDs unchanged. |
| 59 | It expects the LED number passed through R0. */ |
| 60 | |
| 61 | ENTRY(_led_on) |
| 62 | LINK 12; |
| 63 | [--SP] = P0; |
| 64 | [--SP] = R1; |
| 65 | CALL _led_init; |
| 66 | R1 = 1; |
| 67 | R0 += 5; |
| 68 | R1 <<= R0; |
| 69 | P0.H = hi(PORTFIO); |
| 70 | P0.L = lo(PORTFIO); |
| 71 | R0 = W[P0](Z); |
| 72 | SSYNC; |
| 73 | R0 = R0 | R1; |
| 74 | W[P0] = R0.L; |
| 75 | SSYNC; |
| 76 | R1 = [SP++]; |
| 77 | P0 = [SP++]; |
| 78 | UNLINK; |
| 79 | RTS; |
| 80 | .size _led_on, .-_led_on |
| 81 | |
| 82 | /* Set one LED off. Leave other LEDs unchanged. */ |
| 83 | |
| 84 | ENTRY(_led_off) |
| 85 | LINK 12; |
| 86 | [--SP] = P0; |
| 87 | [--SP] = R1; |
| 88 | CALL _led_init; |
| 89 | R1 = 1; |
| 90 | R0 += 5; |
| 91 | R1 <<= R0; |
| 92 | R1 = ~R1; |
| 93 | P0.H = hi(PORTFIO); |
| 94 | P0.L = lo(PORTFIO); |
| 95 | R0 = W[P0](Z); |
| 96 | SSYNC; |
| 97 | R0 = R0 & R1; |
| 98 | W[P0] = R0.L; |
| 99 | SSYNC; |
| 100 | R1 = [SP++]; |
| 101 | P0 = [SP++]; |
| 102 | UNLINK; |
| 103 | RTS; |
| 104 | .size _led_off, .-_led_off |
| 105 | |
| 106 | /* Toggle one LED. Leave other LEDs unchanged. */ |
| 107 | |
| 108 | ENTRY(_led_toggle) |
| 109 | LINK 12; |
| 110 | [--SP] = P0; |
| 111 | [--SP] = R1; |
| 112 | CALL _led_init; |
| 113 | R1 = 1; |
| 114 | R0 += 5; |
| 115 | R1 <<= R0; |
| 116 | P0.H = hi(PORTFIO); |
| 117 | P0.L = lo(PORTFIO); |
| 118 | R0 = W[P0](Z); |
| 119 | SSYNC; |
| 120 | R0 = R0 ^ R1; |
| 121 | W[P0] = R0.L; |
| 122 | SSYNC; |
| 123 | R1 = [SP++]; |
| 124 | P0 = [SP++]; |
| 125 | UNLINK; |
| 126 | RTS; |
| 127 | .size _led_toggle, .-_led_toggle |
| 128 | |
| 129 | /* Display the number using LEDs in binary format. */ |
| 130 | |
| 131 | ENTRY(_led_disp_num) |
| 132 | LINK 12; |
| 133 | [--SP] = P0; |
| 134 | [--SP] = R1; |
| 135 | [--SP] = R2; |
| 136 | CALL _led_init; |
| 137 | R1 = 0x3f(X); |
| 138 | R0 = R0 & R1; |
| 139 | R2 = 6(X); |
| 140 | R0 <<= R2; |
| 141 | R1 <<= R2; |
| 142 | P0.H = hi(PORTFIO); |
| 143 | P0.L = lo(PORTFIO); |
| 144 | R2 = W[P0](Z); |
| 145 | SSYNC; |
| 146 | R1 = ~R1; |
| 147 | R2 = R2 & R1; |
| 148 | R2 = R2 | R0; |
| 149 | W[P0] = R2.L; |
| 150 | SSYNC; |
| 151 | R2 = [SP++]; |
| 152 | R1 = [SP++]; |
| 153 | P0 = [SP++]; |
| 154 | UNLINK; |
| 155 | RTS; |
| 156 | .size _led_disp_num, .-_led_disp_num |
| 157 | |
| 158 | /* Toggle the number using LEDs in binary format. */ |
| 159 | |
| 160 | ENTRY(_led_toggle_num) |
| 161 | LINK 12; |
| 162 | [--SP] = P0; |
| 163 | [--SP] = R1; |
| 164 | [--SP] = R2; |
| 165 | CALL _led_init; |
| 166 | R1 = 0x3f(X); |
| 167 | R0 = R0 & R1; |
| 168 | R1 = 6(X); |
| 169 | R0 <<= R1; |
| 170 | P0.H = hi(PORTFIO); |
| 171 | P0.L = lo(PORTFIO); |
| 172 | R1 = W[P0](Z); |
| 173 | SSYNC; |
| 174 | R1 = R1 ^ R0; |
| 175 | W[P0] = R1.L; |
| 176 | SSYNC; |
| 177 | R2 = [SP++]; |
| 178 | R1 = [SP++]; |
| 179 | P0 = [SP++]; |
| 180 | UNLINK; |
| 181 | RTS; |
| 182 | .size _led_toggle_num, .-_led_toggle_num |
| 183 | |