nkeynes@1 | 1 | #include "dream.h"
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nkeynes@1 | 2 | #include "mem.h"
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nkeynes@1 | 3 | #include "sh4core.h"
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nkeynes@1 | 4 | #include "sh4mmio.h"
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nkeynes@1 | 5 | #define MMIO_IMPL
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nkeynes@1 | 6 | #include "sh4mmio.h"
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nkeynes@1 | 7 |
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nkeynes@1 | 8 | /********************************* MMU *************************************/
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nkeynes@1 | 9 |
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nkeynes@1 | 10 | MMIO_REGION_READ_STUBFN( MMU )
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nkeynes@1 | 11 |
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nkeynes@10 | 12 | #define OCRAM_START (0x1C000000>>PAGE_BITS)
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nkeynes@10 | 13 | #define OCRAM_END (0x20000000>>PAGE_BITS)
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nkeynes@10 | 14 |
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nkeynes@10 | 15 | static char *cache = NULL;
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nkeynes@10 | 16 |
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nkeynes@1 | 17 | void mmio_region_MMU_write( uint32_t reg, uint32_t val )
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nkeynes@1 | 18 | {
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nkeynes@1 | 19 | switch(reg) {
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nkeynes@1 | 20 | case CCR:
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nkeynes@10 | 21 | mmu_set_cache_mode( val & (CCR_OIX|CCR_ORA) );
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nkeynes@1 | 22 | INFO( "Cache mode set to %08X", val );
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nkeynes@1 | 23 | break;
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nkeynes@1 | 24 | default:
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nkeynes@1 | 25 | break;
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nkeynes@1 | 26 | }
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nkeynes@1 | 27 | MMIO_WRITE( MMU, reg, val );
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nkeynes@1 | 28 | }
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nkeynes@1 | 29 |
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nkeynes@1 | 30 |
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nkeynes@10 | 31 | void mmu_init()
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nkeynes@10 | 32 | {
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nkeynes@10 | 33 | cache = mem_alloc_pages(2);
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nkeynes@10 | 34 | }
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nkeynes@10 | 35 |
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nkeynes@10 | 36 | void mmu_set_cache_mode( int mode )
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nkeynes@10 | 37 | {
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nkeynes@10 | 38 | uint32_t i;
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nkeynes@10 | 39 | switch( mode ) {
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nkeynes@10 | 40 | case MEM_OC_INDEX0: /* OIX=0 */
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nkeynes@10 | 41 | for( i=OCRAM_START; i<OCRAM_END; i++ )
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nkeynes@10 | 42 | page_map[i] = cache + ((i&0x02)<<(PAGE_BITS-1));
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nkeynes@10 | 43 | break;
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nkeynes@10 | 44 | case MEM_OC_INDEX1: /* OIX=1 */
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nkeynes@10 | 45 | for( i=OCRAM_START; i<OCRAM_END; i++ )
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nkeynes@10 | 46 | page_map[i] = cache + ((i&0x02000000)>>(25-PAGE_BITS));
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nkeynes@10 | 47 | break;
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nkeynes@10 | 48 | default: /* disabled */
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nkeynes@10 | 49 | for( i=OCRAM_START; i<OCRAM_END; i++ )
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nkeynes@10 | 50 | page_map[i] = NULL;
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nkeynes@10 | 51 | break;
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nkeynes@10 | 52 | }
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nkeynes@10 | 53 | }
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nkeynes@10 | 54 |
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nkeynes@10 | 55 |
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nkeynes@1 | 56 | /********************************* BSC *************************************/
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nkeynes@1 | 57 |
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nkeynes@1 | 58 | uint16_t bsc_output_mask_lo = 0, bsc_output_mask_hi = 0;
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nkeynes@1 | 59 | uint16_t bsc_input_mask_lo = 0, bsc_input_mask_hi = 0;
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nkeynes@1 | 60 | uint32_t bsc_output = 0, bsc_input = 0x0300;
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nkeynes@1 | 61 |
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nkeynes@1 | 62 | void bsc_out( int output, int mask )
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nkeynes@1 | 63 | {
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nkeynes@1 | 64 | /* Go figure... The BIOS won't start without this mess though */
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nkeynes@1 | 65 | if( ((output | (~mask)) & 0x03) == 3 ) {
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nkeynes@1 | 66 | bsc_output |= 0x03;
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nkeynes@1 | 67 | } else {
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nkeynes@1 | 68 | bsc_output &= ~0x03;
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nkeynes@1 | 69 | }
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nkeynes@1 | 70 | }
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nkeynes@1 | 71 |
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nkeynes@1 | 72 | void mmio_region_BSC_write( uint32_t reg, uint32_t val )
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nkeynes@1 | 73 | {
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nkeynes@1 | 74 | int i;
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nkeynes@1 | 75 | switch( reg ) {
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nkeynes@1 | 76 | case PCTRA:
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nkeynes@1 | 77 | bsc_input_mask_lo = bsc_output_mask_lo = 0;
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nkeynes@1 | 78 | for( i=0; i<16; i++ ) {
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nkeynes@1 | 79 | int bits = (val >> (i<<1)) & 0x03;
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nkeynes@1 | 80 | if( bits == 2 ) bsc_input_mask_lo |= (1<<i);
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nkeynes@1 | 81 | else if( bits != 0 ) bsc_output_mask_lo |= (1<<i);
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nkeynes@1 | 82 | }
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nkeynes@1 | 83 | bsc_output = (bsc_output&0x000F0000) |
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nkeynes@1 | 84 | (MMIO_READ( BSC, PDTRA ) & bsc_output_mask_lo);
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nkeynes@1 | 85 | bsc_out( MMIO_READ( BSC, PDTRA ) | ((MMIO_READ(BSC,PDTRB)<<16)),
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nkeynes@1 | 86 | bsc_output_mask_lo | (bsc_output_mask_hi<<16) );
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nkeynes@1 | 87 | break;
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nkeynes@1 | 88 | case PCTRB:
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nkeynes@1 | 89 | bsc_input_mask_hi = bsc_output_mask_hi = 0;
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nkeynes@1 | 90 | for( i=0; i<4; i++ ) {
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nkeynes@1 | 91 | int bits = (val >> (i>>1)) & 0x03;
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nkeynes@1 | 92 | if( bits == 2 ) bsc_input_mask_hi |= (1<<i);
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nkeynes@1 | 93 | else if( bits != 0 ) bsc_output_mask_hi |= (1<<i);
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nkeynes@1 | 94 | }
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nkeynes@1 | 95 | bsc_output = (bsc_output&0xFFFF) |
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nkeynes@1 | 96 | ((MMIO_READ( BSC, PDTRA ) & bsc_output_mask_hi)<<16);
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nkeynes@1 | 97 | break;
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nkeynes@1 | 98 | case PDTRA:
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nkeynes@1 | 99 | bsc_output = (bsc_output&0x000F0000) |
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nkeynes@1 | 100 | (val & bsc_output_mask_lo );
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nkeynes@1 | 101 | bsc_out( val | ((MMIO_READ(BSC,PDTRB)<<16)),
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nkeynes@1 | 102 | bsc_output_mask_lo | (bsc_output_mask_hi<<16) );
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nkeynes@1 | 103 | break;
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nkeynes@1 | 104 | case PDTRB:
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nkeynes@1 | 105 | bsc_output = (bsc_output&0xFFFF) |
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nkeynes@1 | 106 | ( (val & bsc_output_mask_hi)<<16 );
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nkeynes@1 | 107 | break;
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nkeynes@1 | 108 | }
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nkeynes@1 | 109 | WARN( "Write to (mostly) unimplemented BSC (%03X <= %08X) [%s: %s]",
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nkeynes@1 | 110 | reg, val, MMIO_REGID(BSC,reg), MMIO_REGDESC(BSC,reg) );
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nkeynes@1 | 111 | MMIO_WRITE( BSC, reg, val );
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nkeynes@1 | 112 | }
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nkeynes@1 | 113 |
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nkeynes@1 | 114 | int32_t mmio_region_BSC_read( uint32_t reg )
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nkeynes@1 | 115 | {
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nkeynes@1 | 116 | int32_t val;
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nkeynes@1 | 117 | switch( reg ) {
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nkeynes@1 | 118 | case PDTRA:
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nkeynes@1 | 119 | val = (bsc_input & bsc_input_mask_lo) | (bsc_output&0xFFFF);
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nkeynes@1 | 120 | break;
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nkeynes@1 | 121 | case PDTRB:
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nkeynes@1 | 122 | val = ((bsc_input>>16) & bsc_input_mask_hi) | (bsc_output>>16);
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nkeynes@1 | 123 | break;
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nkeynes@1 | 124 | default:
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nkeynes@1 | 125 | val = MMIO_READ( BSC, reg );
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nkeynes@1 | 126 | }
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nkeynes@1 | 127 | WARN( "Read from (mostly) unimplemented BSC (%03X => %08X) [%s: %s]",
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nkeynes@1 | 128 | reg, val, MMIO_REGID(BSC,reg), MMIO_REGDESC(BSC,reg) );
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nkeynes@1 | 129 | return val;
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nkeynes@1 | 130 | }
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nkeynes@1 | 131 |
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nkeynes@1 | 132 | /********************************* UBC *************************************/
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nkeynes@1 | 133 |
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nkeynes@1 | 134 | MMIO_REGION_STUBFNS( UBC )
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nkeynes@1 | 135 |
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nkeynes@1 | 136 | /********************************* CPG *************************************/
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nkeynes@1 | 137 |
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nkeynes@1 | 138 | MMIO_REGION_STUBFNS( CPG )
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nkeynes@1 | 139 |
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nkeynes@1 | 140 | /********************************* DMAC *************************************/
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nkeynes@1 | 141 |
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nkeynes@1 | 142 | MMIO_REGION_STUBFNS( DMAC )
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nkeynes@1 | 143 |
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nkeynes@1 | 144 | /********************************** RTC *************************************/
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nkeynes@1 | 145 |
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nkeynes@1 | 146 | MMIO_REGION_STUBFNS( RTC )
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nkeynes@1 | 147 |
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nkeynes@1 | 148 | /********************************** TMU *************************************/
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nkeynes@1 | 149 |
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nkeynes@1 | 150 | int timer_divider[3] = {16,16,16};
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nkeynes@1 | 151 | MMIO_REGION_READ_DEFFN( TMU )
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nkeynes@1 | 152 |
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nkeynes@1 | 153 | int get_timer_div( int val )
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nkeynes@1 | 154 | {
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nkeynes@1 | 155 | switch( val & 0x07 ) {
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nkeynes@1 | 156 | case 0: return 16; /* assume peripheral clock is IC/4 */
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nkeynes@1 | 157 | case 1: return 64;
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nkeynes@1 | 158 | case 2: return 256;
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nkeynes@1 | 159 | case 3: return 1024;
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nkeynes@1 | 160 | case 4: return 4096;
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nkeynes@1 | 161 | }
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nkeynes@1 | 162 | return 1;
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nkeynes@1 | 163 | }
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nkeynes@1 | 164 |
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nkeynes@1 | 165 | void mmio_region_TMU_write( uint32_t reg, uint32_t val )
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nkeynes@1 | 166 | {
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nkeynes@1 | 167 | switch( reg ) {
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nkeynes@1 | 168 | case TCR0:
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nkeynes@1 | 169 | timer_divider[0] = get_timer_div(val);
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nkeynes@1 | 170 | break;
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nkeynes@1 | 171 | case TCR1:
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nkeynes@1 | 172 | timer_divider[1] = get_timer_div(val);
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nkeynes@1 | 173 | break;
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nkeynes@1 | 174 | case TCR2:
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nkeynes@1 | 175 | timer_divider[2] = get_timer_div(val);
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nkeynes@1 | 176 | break;
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nkeynes@1 | 177 | }
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nkeynes@1 | 178 | MMIO_WRITE( TMU, reg, val );
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nkeynes@1 | 179 | }
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nkeynes@1 | 180 |
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nkeynes@1 | 181 | void run_timers( int cycles )
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nkeynes@1 | 182 | {
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nkeynes@1 | 183 | int tcr = MMIO_READ( TMU, TSTR );
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nkeynes@1 | 184 | cycles *= 16;
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nkeynes@1 | 185 | if( tcr & 1 ) {
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nkeynes@1 | 186 | int count = cycles / timer_divider[0];
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nkeynes@1 | 187 | int *val = MMIO_REG( TMU, TCNT0 );
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nkeynes@1 | 188 | if( *val < count ) {
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nkeynes@1 | 189 | MMIO_READ( TMU, TCR0 ) |= 0x100;
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nkeynes@1 | 190 | /* interrupt goes here */
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nkeynes@1 | 191 | count -= *val;
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nkeynes@1 | 192 | *val = MMIO_READ( TMU, TCOR0 ) - count;
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nkeynes@1 | 193 | } else {
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nkeynes@1 | 194 | *val -= count;
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nkeynes@1 | 195 | }
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nkeynes@1 | 196 | }
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nkeynes@1 | 197 | }
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nkeynes@1 | 198 |
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nkeynes@1 | 199 | /********************************** SCI *************************************/
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nkeynes@1 | 200 |
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nkeynes@1 | 201 | MMIO_REGION_STUBFNS( SCI )
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nkeynes@1 | 202 |
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nkeynes@1 | 203 | /********************************* SCIF *************************************/
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nkeynes@1 | 204 |
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nkeynes@1 | 205 | MMIO_REGION_STUBFNS( SCIF )
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nkeynes@1 | 206 |
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