diff options
Diffstat (limited to 'c/src/lib/libbsp/sparc/erc32/startup/boardinit.S')
-rw-r--r-- | c/src/lib/libbsp/sparc/erc32/startup/boardinit.S | 84 |
1 files changed, 84 insertions, 0 deletions
diff --git a/c/src/lib/libbsp/sparc/erc32/startup/boardinit.S b/c/src/lib/libbsp/sparc/erc32/startup/boardinit.S new file mode 100644 index 0000000000..cc44b2632e --- /dev/null +++ b/c/src/lib/libbsp/sparc/erc32/startup/boardinit.S @@ -0,0 +1,84 @@ +/* + * boardinit.s + * + * Initialise various ERC32 registers + * + * $Id$ + */ + +#include <asm.h> +#include <erc32.h> + + .global __bsp_board_init +__bsp_board_init: + + +/* Check if MEC is initialised. If not, this means that we are + running on the simulator. Initiate some of the parameters + that are done by the boot-prom otherwise. +*/ + + set SYM(ERC32_MEC), %g3 ! g3 = base address of peripherals + ld [%g3], %g2 + set 0xfe080000, %g1 + andcc %g1, %g2, %g0 + bne 2f + + /* Stop the watchdog */ + + st %g0, [%g3 + SYM(ERC32_MEC_WATCHDOG_TRAP_DOOR_SET_OFFSET)] + + /* Set zero waitstates */ + + st %g0, [%g3 + SYM(ERC32_MEC_WAIT_STATE_CONFIGURATION_OFFSET)] + + /* Set the correct memory size in MEC memory config register */ + + set SYM(PROM_SIZE), %l0 + set 0, %l1 + srl %l0, 18, %l0 +1: + tst %l0 + srl %l0, 1, %l0 + bne,a 1b + inc %l1 + sll %l1, 8, %l1 + + set SYM(RAM_SIZE), %l0 + srl %l0, 19, %l0 +1: + tst %l0 + srl %l0, 1, %l0 + bne,a 1b + inc %l1 + sll %l1, 10, %l1 + + ! set the Memory Configuration + st %l1, [ %g3 + ERC32_MEC_MEMORY_CONFIGURATION_OFFSET ] + + set SYM(RAM_START), %l1 ! Cannot use RAM_END due to bug in linker + set SYM(RAM_SIZE), %l2 + add %l1, %l2, %sp + + set SYM(CLOCK_SPEED), %g6 ! Use 14 MHz in simulator + set 14, %g1 + st %g1, [%g6] + +2: + + /* Initialise timer */ + + set SYM(_ERC32_MEC_Timer_Control_Mirror), %l2 + st %g0, [%l2] + st %g0, [%g3 + SYM(ERC32_MEC_TIMER_CONTROL_OFFSET)] + + /* Enable power-down */ + + ld [%g3 + SYM(ERC32_MEC_CONTROL_OFFSET)], %l2 + or %l2, ERC32_CONFIGURATION_POWER_DOWN_ALLOWED, %l2 + st %l2, [%g3 + SYM(ERC32_MEC_CONTROL_OFFSET)] + + retl + nop + +/* end of file */ |