/* arch/m68knommu/platform/68360/head-rom.S * * Startup code for Motorola 68360 * * Copyright (C) SED Systems, a Division of Calian Ltd. * Based on: arch/m68knommu/platform/68328/pilot/crt0_rom.S * Based on: arch/m68knommu/platform/68360/uCquicc/crt0_rom.S, 2.0.38.1.pre7 * uClinux Kernel * Copyright (C) Michael Leslie * Based on: arch/m68knommu/platform/68EZ328/ucsimm/crt0_rom.S * Copyright (C) 1998 D. Jeff Dionne , * */ #include .global _stext .global _sbss .global _start .global _rambase .global __ramvec .global _ramvec .global _ramstart .global _ramend .global _quicc_base .global _periph_base #define REGB 0x1000 #define PEPAR (_dprbase + REGB + 0x0016) #define GMR (_dprbase + REGB + 0x0040) #define OR0 (_dprbase + REGB + 0x0054) #define BR0 (_dprbase + REGB + 0x0050) #define OR1 (_dprbase + REGB + 0x0064) #define BR1 (_dprbase + REGB + 0x0060) #define OR2 (_dprbase + REGB + 0x0074) #define BR2 (_dprbase + REGB + 0x0070) #define OR3 (_dprbase + REGB + 0x0084) #define BR3 (_dprbase + REGB + 0x0080) #define OR4 (_dprbase + REGB + 0x0094) #define BR4 (_dprbase + REGB + 0x0090) #define OR5 (_dprbase + REGB + 0x00A4) #define BR5 (_dprbase + REGB + 0x00A0) #define OR6 (_dprbase + REGB + 0x00b4) #define BR6 (_dprbase + REGB + 0x00b0) #define OR7 (_dprbase + REGB + 0x00c4) #define BR7 (_dprbase + REGB + 0x00c0) #define MCR (_dprbase + REGB + 0x0000) #define AVR (_dprbase + REGB + 0x0008) #define SYPCR (_dprbase + REGB + 0x0022) #define PLLCR (_dprbase + REGB + 0x0010) #define CLKOCR (_dprbase + REGB + 0x000C) #define CDVCR (_dprbase + REGB + 0x0014) #define BKAR (_dprbase + REGB + 0x0030) #define BKCR (_dprbase + REGB + 0x0034) #define SWIV (_dprbase + REGB + 0x0023) #define PICR (_dprbase + REGB + 0x0026) #define PITR (_dprbase + REGB + 0x002A) /* Define for all memory configuration */ #define MCU_SIM_GMR 0x00000000 #define SIM_OR_MASK 0x0fffffff /* Defines for chip select zero - the flash */ #define SIM_OR0_MASK 0x20000000 #define SIM_BR0_MASK 0x00000001 /* Defines for chip select one - the RAM */ #define SIM_OR1_MASK 0x10000000 #define SIM_BR1_MASK 0x00000001 #define MCU_SIM_MBAR_ADRS 0x0003ff00 #define MCU_SIM_MBAR_BA_MASK 0xfffff000 #define MCU_SIM_MBAR_AS_MASK 0x00000001 #define MCU_SIM_PEPAR 0x00B4 #define MCU_DISABLE_INTRPTS 0x2700 #define MCU_SIM_AVR 0x00 #define MCU_SIM_MCR 0x00005cff #define MCU_SIM_CLKOCR 0x00 #define MCU_SIM_PLLCR 0x8000 #define MCU_SIM_CDVCR 0x0000 #define MCU_SIM_SYPCR 0x0000 #define MCU_SIM_SWIV 0x00 #define MCU_SIM_PICR 0x0000 #define MCU_SIM_PITR 0x0000 #include /* * By the time this RAM specific code begins to execute, DPRAM * and DRAM should already be mapped and accessible. */ .text _start: _stext: nop ori.w #MCU_DISABLE_INTRPTS, %sr /* disable interrupts: */ /* We should not need to setup the boot stack the reset should do it. */ movea.l #__ramend, %sp /* set up stack at the end of DRAM:*/ set_mbar_register: moveq.l #0x07, %d1 /* Setup MBAR */ movec %d1, %dfc lea.l MCU_SIM_MBAR_ADRS, %a0 move.l #_dprbase, %d0 andi.l #MCU_SIM_MBAR_BA_MASK, %d0 ori.l #MCU_SIM_MBAR_AS_MASK, %d0 moves.l %d0, %a0@ moveq.l #0x05, %d1 movec.l %d1, %dfc /* Now we can begin to access registers in DPRAM */ set_sim_mcr: /* Set Module Configuration Register */ move.l #MCU_SIM_MCR, MCR /* to do: Determine cause of reset */ /* * configure system clock MC68360 p. 6-40 * (value +1)*osc/128 = system clock * or * (value + 1)*osc = system clock * You do not need to divide the oscillator by 128 unless you want to. */ set_sim_clock: move.w #MCU_SIM_PLLCR, PLLCR move.b #MCU_SIM_CLKOCR, CLKOCR move.w #MCU_SIM_CDVCR, CDVCR /* Wait for the PLL to settle */ move.w #16384, %d0 pll_settle_wait: subi.w #1, %d0 bne pll_settle_wait /* Setup the system protection register, and watchdog timer register */ move.b #MCU_SIM_SWIV, SWIV move.w #MCU_SIM_PICR, PICR move.w #MCU_SIM_PITR, PITR move.w #MCU_SIM_SYPCR, SYPCR /* Clear DPRAM - system + parameter */ movea.l #_dprbase, %a0 movea.l #_dprbase+0x2000, %a1 /* Copy 0 to %a0 until %a0 == %a1 */ clear_dpram: movel #0, %a0@+ cmpal %a0, %a1 bhi clear_dpram configure_memory_controller: /* Set up Global Memory Register (GMR) */ move.l #MCU_SIM_GMR, %d0 move.l %d0, GMR configure_chip_select_0: move.l #0x00400000, %d0 subq.l #0x01, %d0 eori.l #SIM_OR_MASK, %d0 ori.l #SIM_OR0_MASK, %d0 move.l %d0, OR0 move.l #__rom_start, %d0 ori.l #SIM_BR0_MASK, %d0 move.l %d0, BR0 move.l #0x0, BR1 move.l #0x0, BR2 move.l #0x0, BR3 move.l #0x0, BR4 move.l #0x0, BR5 move.l #0x0, BR6 move.l #0x0, BR7 move.w #MCU_SIM_PEPAR, PEPAR /* point to vector table: */ move.l #_romvec, %a0 move.l #_ramvec, %a1 copy_vectors: move.l %a0@, %d0 move.l %d0, %a1@ move.l %a0@, %a1@ addq.l #0x04, %a0 addq.l #0x04, %a1 cmp.l #_start, %a0 blt copy_vectors move.l #_ramvec, %a1 movec %a1, %vbr /* Copy data segment from ROM to RAM */ moveal #_etext, %a0 moveal #_sdata, %a1 moveal #_edata, %a2 /* Copy %a0 to %a1 until %a1 == %a2 */ LD1: move.l %a0@, %d0 addq.l #0x04, %a0 move.l %d0, %a1@ addq.l #0x04, %a1 cmp.l #_edata, %a1 blt LD1 moveal #_sbss, %a0 moveal #_ebss, %a1 /* Copy 0 to %a0 until %a0 == %a1 */ L1: movel #0, %a0@+ cmpal %a0, %a1 bhi L1 load_quicc: move.l #_dprbase, _quicc_base store_ram_size: /* Set ram size information */ move.l #_sdata, _rambase move.l #_ebss, _ramstart move.l #__ramend, %d0 sub.l #0x1000, %d0 /* Reserve 4K for stack space.*/ move.l %d0, _ramend /* Different from __ramend.*/ store_flash_size: /* Set rom size information */ move.l #__rom_end, %d0 sub.l #__rom_start, %d0 move.l %d0, rom_length pea 0 pea env pea %sp@(4) pea 0 lea init_thread_union, %a2 lea 0x2000(%a2), %sp lp: jsr start_kernel _exit: jmp _exit .data .align 4 env: .long 0 _quicc_base: .long 0 _periph_base: .long 0 _ramvec: .long 0 _rambase: .long 0 _ramstart: .long 0 _ramend: .long 0 _dprbase: .long 0xffffe000 .text /* * These are the exception vectors at boot up, they are copied into RAM * and then overwritten as needed. */ .section ".data.initvect","awx" .long __ramend /* Reset: Initial Stack Pointer - 0. */ .long _start /* Reset: Initial Program Counter - 1. */ .long buserr /* Bus Error - 2. */ .long trap /* Address Error - 3. */ .long trap /* Illegal Instruction - 4. */ .long trap /* Divide by zero - 5. */ .long trap /* CHK, CHK2 Instructions - 6. */ .long trap /* TRAPcc, TRAPV Instructions - 7. */ .long trap /* Privilege Violation - 8. */ .long trap /* Trace - 9. */ .long trap /* Line 1010 Emulator - 10. */ .long trap /* Line 1111 Emualtor - 11. */ .long trap /* Harware Breakpoint - 12. */ .long trap /* (Reserved for Coprocessor Protocol Violation)- 13. */ .long trap /* Format Error - 14. */ .long trap /* Uninitialized Interrupt - 15. */ .long trap /* (Unassigned, Reserver) - 16. */ .long trap /* (Unassigned, Reserver) - 17. */ .long trap /* (Unassigned, Reserver) - 18. */ .long trap /* (Unassigned, Reserver) - 19. */ .long trap /* (Unassigned, Reserver) - 20. */ .long trap /* (Unassigned, Reserver) - 21. */ .long trap /* (Unassigned, Reserver) - 22. */ .long trap /* (Unassigned, Reserver) - 23. */ .long trap /* Spurious Interrupt - 24. */ .long trap /* Level 1 Interrupt Autovector - 25. */ .long trap /* Level 2 Interrupt Autovector - 26. */ .long trap /* Level 3 Interrupt Autovector - 27. */ .long trap /* Level 4 Interrupt Autovector - 28. */ .long trap /* Level 5 Interrupt Autovector - 29. */ .long trap /* Level 6 Interrupt Autovector - 30. */ .long trap /* Level 7 Interrupt Autovector - 31. */ .long system_call /* Trap Instruction Vectors 0 - 32. */ .long trap /* Trap Instruction Vectors 1 - 33. */ .long trap /* Trap Instruction Vectors 2 - 34. */ .long trap /* Trap Instruction Vectors 3 - 35. */ .long trap /* Trap Instruction Vectors 4 - 36. */ .long trap /* Trap Instruction Vectors 5 - 37. */ .long trap /* Trap Instruction Vectors 6 - 38. */ .long trap /* Trap Instruction Vectors 7 - 39. */ .long trap /* Trap Instruction Vectors 8 - 40. */ .long trap /* Trap Instruction Vectors 9 - 41. */ .long trap /* Trap Instruction Vectors 10 - 42. */ .long trap /* Trap Instruction Vectors 11 - 43. */ .long trap /* Trap Instruction Vectors 12 - 44. */ .long trap /* Trap Instruction Vectors 13 - 45. */ .long trap /* Trap Instruction Vectors 14 - 46. */ .long trap /* Trap Instruction Vectors 15 - 47. */ .long 0 /* (Reserved for Coprocessor) - 48. */ .long 0 /* (Reserved for Coprocessor) - 49. */ .long 0 /* (Reserved for Coprocessor) - 50. */ .long 0 /* (Reserved for Coprocessor) - 51. */ .long 0 /* (Reserved for Coprocessor) - 52. */ .long 0 /* (Reserved for Coprocessor) - 53. */ .long 0 /* (Reserved for Coprocessor) - 54. */ .long 0 /* (Reserved for Coprocessor) - 55. */ .long 0 /* (Reserved for Coprocessor) - 56. */ .long 0 /* (Reserved for Coprocessor) - 57. */ .long 0 /* (Reserved for Coprocessor) - 58. */ .long 0 /* (Unassigned, Reserved) - 59. */ .long 0 /* (Unassigned, Reserved) - 60. */ .long 0 /* (Unassigned, Reserved) - 61. */ .long 0 /* (Unassigned, Reserved) - 62. */ .long 0 /* (Unassigned, Reserved) - 63. */ /* The assignment of these vectors to the CPM is */ /* dependent on the configuration of the CPM vba */ /* fields. */ .long 0 /* (User-Defined Vectors 1) CPM Error - 64. */ .long 0 /* (User-Defined Vectors 2) CPM Parallel IO PC11- 65. */ .long 0 /* (User-Defined Vectors 3) CPM Parallel IO PC10- 66. */ .long 0 /* (User-Defined Vectors 4) CPM SMC2 / PIP - 67. */ .long 0 /* (User-Defined Vectors 5) CPM SMC1 - 68. */ .long 0 /* (User-Defined Vectors 6) CPM SPI - 69. */ .long 0 /* (User-Defined Vectors 7) CPM Parallel IO PC9 - 70. */ .long 0 /* (User-Defined Vectors 8) CPM Timer 4 - 71. */ .long 0 /* (User-Defined Vectors 9) CPM Reserved - 72. */ .long 0 /* (User-Defined Vectors 10) CPM Parallel IO PC8- 73. */ .long 0 /* (User-Defined Vectors 11) CPM Parallel IO PC7- 74. */ .long 0 /* (User-Defined Vectors 12) CPM Parallel IO PC6- 75. */ .long 0 /* (User-Defined Vectors 13) CPM Timer 3 - 76. */ .long 0 /* (User-Defined Vectors 14) CPM Reserved - 77. */ .long 0 /* (User-Defined Vectors 15) CPM Parallel IO PC5- 78. */ .long 0 /* (User-Defined Vectors 16) CPM Parallel IO PC4- 79. */ .long 0 /* (User-Defined Vectors 17) CPM Reserved - 80. */ .long 0 /* (User-Defined Vectors 18) CPM RISC Timer Tbl - 81. */ .long 0 /* (User-Defined Vectors 19) CPM Timer 2 - 82. */ .long 0 /* (User-Defined Vectors 21) CPM Reserved - 83. */ .long 0 /* (User-Defined Vectors 22) CPM IDMA2 - 84. */ .long 0 /* (User-Defined Vectors 23) CPM IDMA1 - 85. */ .long 0 /* (User-Defined Vectors 24) CPM SDMA Bus Err - 86. */ .long 0 /* (User-Defined Vectors 25) CPM Parallel IO PC3- 87. */ .long 0 /* (User-Defined Vectors 26) CPM Parallel IO PC2- 88. */ .long 0 /* (User-Defined Vectors 27) CPM Timer 1 - 89. */ .long 0 /* (User-Defined Vectors 28) CPM Parallel IO PC1- 90. */ .long 0 /* (User-Defined Vectors 29) CPM SCC 4 - 91. */ .long 0 /* (User-Defined Vectors 30) CPM SCC 3 - 92. */ .long 0 /* (User-Defined Vectors 31) CPM SCC 2 - 93. */ .long 0 /* (User-Defined Vectors 32) CPM SCC 1 - 94. */ .long 0 /* (User-Defined Vectors 33) CPM Parallel IO PC0- 95. */ /* I don't think anything uses the vectors after here. */ .long 0 /* (User-Defined Vectors 34) - 96. */ .long 0,0,0,0,0 /* (User-Defined Vectors 35 - 39). */ .long 0,0,0,0,0,0,0,0,0,0 /* (User-Defined Vectors 40 - 49). */ .long 0,0,0,0,0,0,0,0,0,0 /* (User-Defined Vectors 50 - 59). */ .long 0,0,0,0,0,0,0,0,0,0 /* (User-Defined Vectors 60 - 69). */ .long 0,0,0,0,0,0,0,0,0,0 /* (User-Defined Vectors 70 - 79). */ .long 0,0,0,0,0,0,0,0,0,0 /* (User-Defined Vectors 80 - 89). */ .long 0,0,0,0,0,0,0,0,0,0 /* (User-Defined Vectors 90 - 99). */ .long 0,0,0,0,0,0,0,0,0,0 /* (User-Defined Vectors 100 - 109). */ .long 0,0,0,0,0,0,0,0,0,0 /* (User-Defined Vectors 110 - 119). */ .long 0,0,0,0,0,0,0,0,0,0 /* (User-Defined Vectors 120 - 129). */ .long 0,0,0,0,0,0,0,0,0,0 /* (User-Defined Vectors 130 - 139). */ .long 0,0,0,0,0,0,0,0,0,0 /* (User-Defined Vectors 140 - 149). */ .long 0,0,0,0,0,0,0,0,0,0 /* (User-Defined Vectors 150 - 159). */ .long 0,0,0,0,0,0,0,0,0,0 /* (User-Defined Vectors 160 - 169). */ .long 0,0,0,0,0,0,0,0,0,0 /* (User-Defined Vectors 170 - 179). */ .long 0,0,0,0,0,0,0,0,0,0 /* (User-Defined Vectors 180 - 189). */ .long 0,0,0 /* (User-Defined Vectors 190 - 192). */ .text ignore: rte