| wdenk | efee170 | 2002-07-20 20:14:13 +0000 | [diff] [blame] | 1 | #include <config.h> |
| 2 | #include <74xx_7xx.h> |
| 3 | #include <version.h> |
| 4 | |
| 5 | #include <ppc_asm.tmpl> |
| 6 | #include <ppc_defs.h> |
| 7 | |
| 8 | #include <asm/cache.h> |
| 9 | #include <asm/mmu.h> |
| 10 | |
| 11 | #include <galileo/gt64260R.h> |
| 12 | |
| 13 | #ifdef CONFIG_ECC |
| 14 | /* Galileo specific asm code for initializing ECC */ |
| 15 | .globl board_relocate_rom |
| 16 | board_relocate_rom: |
| 17 | mflr r7 |
| 18 | /* update the location of the GT registers */ |
| 19 | lis r11, CFG_GT_REGS@h |
| 20 | /* if we're using ECC, we must use the DMA engine to copy ourselves */ |
| 21 | bl start_idma_transfer_0 |
| 22 | bl wait_for_idma_0 |
| 23 | bl stop_idma_engine_0 |
| 24 | |
| 25 | mtlr r7 |
| 26 | blr |
| 27 | |
| 28 | .globl board_init_ecc |
| 29 | board_init_ecc: |
| 30 | mflr r7 |
| 31 | /* NOTE: r10 still contains the location we've been relocated to |
| 32 | * which happens to be TOP_OF_RAM - CFG_MONITOR_LEN */ |
| 33 | |
| 34 | /* now that we're running from ram, init the rest of main memory |
| 35 | * for ECC use */ |
| 36 | lis r8, CFG_MONITOR_LEN@h |
| 37 | ori r8, r8, CFG_MONITOR_LEN@l |
| 38 | |
| 39 | divw r3, r10, r8 |
| 40 | |
| 41 | /* set up the counter, and init the starting address */ |
| 42 | mtctr r3 |
| 43 | li r12, 0 |
| 44 | |
| 45 | /* bytes per transfer */ |
| 46 | mr r5, r8 |
| 47 | about_to_init_ecc: |
| 48 | 1: mr r3, r12 |
| 49 | mr r4, r12 |
| 50 | bl start_idma_transfer_0 |
| 51 | bl wait_for_idma_0 |
| 52 | bl stop_idma_engine_0 |
| 53 | add r12, r12, r8 |
| 54 | bdnz 1b |
| 55 | |
| 56 | mtlr r7 |
| 57 | blr |
| 58 | |
| 59 | /* r3: dest addr |
| 60 | * r4: source addr |
| 61 | * r5: byte count |
| 62 | * r11: gt regbase |
| 63 | * trashes: r6, r5 |
| 64 | */ |
| 65 | start_idma_transfer_0: |
| 66 | /* set the byte count, including the OWN bit */ |
| 67 | mr r6, r11 |
| 68 | ori r6, r6, CHANNEL0_DMA_BYTE_COUNT |
| 69 | stwbrx r5, 0, (r6) |
| 70 | |
| 71 | /* set the source address */ |
| 72 | mr r6, r11 |
| 73 | ori r6, r6, CHANNEL0_DMA_SOURCE_ADDRESS |
| 74 | stwbrx r4, 0, (r6) |
| 75 | |
| 76 | /* set the dest address */ |
| 77 | mr r6, r11 |
| 78 | ori r6, r6, CHANNEL0_DMA_DESTINATION_ADDRESS |
| 79 | stwbrx r3, 0, (r6) |
| 80 | |
| 81 | /* set the next record pointer */ |
| 82 | li r5, 0 |
| 83 | mr r6, r11 |
| 84 | ori r6, r6, CHANNEL0NEXT_RECORD_POINTER |
| 85 | stwbrx r5, 0, (r6) |
| 86 | |
| 87 | /* set the low control register */ |
| 88 | /* bit 9 is NON chained mode, bit 31 is new style descriptors. |
| 89 | bit 12 is channel enable */ |
| 90 | ori r5, r5, (1 << 12) | (1 << 12) | (1 << 11) |
| 91 | /* 15 shifted by 16 (oris) == bit 31 */ |
| 92 | oris r5, r5, (1 << 15) |
| 93 | mr r6, r11 |
| 94 | ori r6, r6, CHANNEL0CONTROL |
| 95 | stwbrx r5, 0, (r6) |
| 96 | |
| 97 | blr |
| 98 | |
| 99 | /* this waits for the bytecount to return to zero, indicating |
| 100 | * that the trasfer is complete */ |
| 101 | wait_for_idma_0: |
| 102 | mr r5, r11 |
| 103 | lis r6, 0xff |
| 104 | ori r6, r6, 0xffff |
| 105 | ori r5, r5, CHANNEL0_DMA_BYTE_COUNT |
| 106 | 1: lwbrx r4, 0, (r5) |
| 107 | and. r4, r4, r6 |
| 108 | bne 1b |
| 109 | |
| 110 | blr |
| 111 | |
| 112 | /* this turns off channel 0 of the idma engine */ |
| 113 | stop_idma_engine_0: |
| 114 | /* shut off the DMA engine */ |
| 115 | li r5, 0 |
| 116 | mr r6, r11 |
| 117 | ori r6, r6, CHANNEL0CONTROL |
| 118 | stwbrx r5, 0, (r6) |
| 119 | |
| 120 | blr |
| 121 | #endif |
| 122 | |
| 123 | #ifdef CFG_BOARD_ASM_INIT |
| 124 | /* NOTE: trashes r3-r7 */ |
| 125 | .globl board_asm_init |
| 126 | board_asm_init: |
| 127 | /* just move the GT registers to where they belong */ |
| 128 | lis r3, CFG_DFL_GT_REGS@h |
| 129 | ori r3, r3, CFG_DFL_GT_REGS@l |
| 130 | lis r4, CFG_GT_REGS@h |
| 131 | ori r4, r4, CFG_GT_REGS@l |
| 132 | li r5, INTERNAL_SPACE_DECODE |
| 133 | |
| 134 | /* test to see if we've already moved */ |
| 135 | lwbrx r6, r5, r4 |
| 136 | andi. r6, r6, 0xffff |
| 137 | rlwinm r7, r4, 12, 16, 31 |
| 138 | cmp cr0, r7, r6 |
| 139 | beqlr |
| 140 | |
| 141 | /* nope, have to move the registers */ |
| 142 | lwbrx r6, r5, r3 |
| 143 | andis. r6, r6, 0xffff |
| 144 | or r6, r6, r7 |
| 145 | stwbrx r6, r5, r3 |
| 146 | |
| 147 | /* now, poll for the change */ |
| 148 | 1: lwbrx r7, r5, r4 |
| 149 | cmp cr0, r7, r6 |
| 150 | bne 1b |
| 151 | |
| 152 | /* done! */ |
| 153 | blr |
| 154 | #endif |
| 155 | |
| 156 | /* For use of the debug LEDs */ |
| 157 | .global led_on0 |
| 158 | led_on0: |
| 159 | xor r18, r18, r18 |
| 160 | lis r18, 0x1c80 |
| 161 | ori r18, r18, 0x8000 |
| 162 | stw r18, 0x0(r18) |
| 163 | sync |
| 164 | blr |
| 165 | |
| 166 | .global led_on1 |
| 167 | led_on1: |
| 168 | xor r18, r18, r18 |
| 169 | lis r18, 0x1c80 |
| 170 | ori r18, r18, 0xc000 |
| 171 | stw r18, 0x0(r18) |
| 172 | sync |
| 173 | blr |
| 174 | |
| 175 | .global led_on2 |
| 176 | led_on2: |
| 177 | xor r18, r18, r18 |
| 178 | lis r18, 0x1c81 |
| 179 | ori r18, r18, 0x0000 |
| 180 | stw r18, 0x0(r18) |
| 181 | sync |
| 182 | blr |