diff options
Diffstat (limited to 'board/delta')
| -rw-r--r-- | board/delta/lowlevel_init.S | 141 |
1 files changed, 83 insertions, 58 deletions
diff --git a/board/delta/lowlevel_init.S b/board/delta/lowlevel_init.S index 4d62be5..35716f2 100644 --- a/board/delta/lowlevel_init.S +++ b/board/delta/lowlevel_init.S @@ -48,7 +48,21 @@ DRAM_SIZE: .long CFG_DRAM_SIZE cmp r3, \time bls 0b .endm - + + +#define SDRAM_CMD_NOP 0x40000000 + +.macro do_nop_cmd num + ldr r2, =MDMRS + ldr r3, =SDRAM_CMD_NOP + ldr r4, =0x0 +loop: + str r3, [r2] + add r4, r4, #1 + cmp r4, \num + bls loop +.endm + /* * Memory setup */ @@ -58,39 +72,15 @@ lowlevel_init: /* Set up GPIO pins first ----------------------------------------- */ mov r10, lr - /* Configure GPIO Pins 41 - 48 as UART1 / altern. Fkt. 2 */ - ldr r0, =0x40E10438 @ GPIO41 FFRXD - ldr r1, =0x802 - str r1, [r0] - - ldr r0, =0x40E1043C @ GPIO42 FFTXD - ldr r1, =0x802 - str r1, [r0] - - ldr r0, =0x40E10440 @ GPIO43 FFCTS - ldr r1, =0x802 - str r1, [r0] - - ldr r0, =0x40E10444 @ GPIO 44 FFDCD - ldr r1, =0x802 - str r1, [r0] - - ldr r0, =0x40E10448 @ GPIO 45 FFDSR - ldr r1, =0x802 - str r1, [r0] - - ldr r0, =0x40E1044C @ GPIO 46 FFRI - ldr r1, =0x802 - str r1, [r0] - - ldr r0, =0x40E10450 @ GPIO 47 FFDTR - ldr r1, =0x802 - str r1, [r0] - - ldr r0, =0x40E10454 @ GPIO 48 - ldr r1, =0x802 - str r1, [r0] + /* Configure GPIO Pins 97, 98 UART1 / altern. Fkt. 1 */ + ldr r0, =GPIO97 + ldr r1, =0x801 + str r1, [r0] + ldr r0, =GPIO98 + ldr r1, =0x801 + str r1, [r0] + /* tebrandt - ASCR, clear the RDH bit */ ldr r0, =ASCR ldr r1, [r0] @@ -99,10 +89,6 @@ lowlevel_init: /* ---------------------------------------------------------------- */ /* Enable memory interface */ - /* */ - /* The sequence below is based on the recommended init steps */ - /* detailed in the Intel PXA250 Operating Systems Developers Guide, */ - /* Chapter 10. */ /* ---------------------------------------------------------------- */ /* ---------------------------------------------------------------- */ @@ -110,21 +96,67 @@ lowlevel_init: /* clocks to settle. Only necessary after hard reset... */ /* FIXME: can be optimized later */ /* ---------------------------------------------------------------- */ - - /* mk: replaced with wait macro */ -/* ldr r3, =OSCR /\* reset the OS Timer Count to zero *\/ */ -/* mov r2, #0 */ -/* str r2, [r3] */ -/* ldr r4, =0x300 /\* really 0x2E1 is about 200usec, *\/ */ -/* /\* so 0x300 should be plenty *\/ */ -/* 1: */ -/* ldr r2, [r3] */ -/* cmp r4, r2 */ -/* bgt 1b */ wait #300 mem_init: +#define NEW_SDRAM_INIT 1 +#ifdef NEW_SDRAM_INIT + + /* Configure ACCR Register - enable DMEMC Clock at 260 / 2 MHz */ + ldr r0, =ACCR + ldr r1, [r0] + orr r1, r1, #0x3000 + str r1, [r0] + ldr r1, [r0] + + /* 2. Programm MDCNFG, leaving DMCEN de-asserted */ + ldr r0, =MDCNFG + ldr r1, =(MDCNFG_DMAP | MDCNFG_DTYPE | MDCNFG_DTC_2 | MDCNFG_DCSE0 | MDCNFG_DRAC_13) + /* ldr r1, =0x80000403 */ + str r1, [r0] + ldr r1, [r0] /* delay until written */ + + /* 3. wait nop power up waiting period (200ms) + * optimization: Steps 4+6 can be done during this + */ + wait #300 + + /* 4. Perform an initial Rcomp-calibration cycle */ + ldr r0, =RCOMP + ldr r1, =0x80000000 + str r1, [r0] + ldr r1, [r0] /* delay until written */ + /* missing: program for automatic rcomp evaluation cycles */ + + /* 5. DDR DRAM strobe delay calibration */ + ldr r0, =DDR_HCAL + ldr r1, =0x88000007 + str r1, [r0] + wait #5 + ldr r1, [r0] /* delay until written */ + + /* Set MDMRS */ + ldr r0, =MDMRS + ldr r1, =0x60000023 + str r1, [r0] + wait #300 + + /* Configure MDREFR */ + ldr r0, =MDREFR + ldr r1, =0x00000006 + str r1, [r0] + ldr r1, [r0] + + /* Enable the dynamic memory controller */ + ldr r0, =MDCNFG + ldr r1, [r0] + orr r1, r1, #MDCNFG_DMCEN + str r1, [r0] + + +#else /* NEW_SDRAM_INIT */ + /* configure the MEMCLKCFG register */ ldr r1, =MEMCLKCFG ldr r2, =0x00010001 @@ -235,6 +267,8 @@ mem_init: orr r1, r1, #0x40000000 @ enable SDRAM for Normal Access str r1, [r0] +#endif /* NEW_SDRAM_INIT */ + /* scrub/init SDRAM if enabled/present */ /* ldr r11, =0xa0000000 /\* base address of SDRAM (CFG_DRAM_BASE) *\/ */ /* ldr r12, =0x04000000 /\* size of memory to scrub (CFG_DRAM_SIZE) *\/ */ @@ -270,18 +304,9 @@ mem_init: mov r0,#0x80000000 mcr p14,0,r0,c10,c0,0 // dcsr - - - /* We are finished with Intel's memory controller initialisation */ - - - /* ---------------------------------------------------------------- */ - /* End lowlevel_init */ - /* ---------------------------------------------------------------- */ - endlowlevel_init: - mov pc, lr + mov pc, lr /* |