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Diffstat (limited to 'board/lpd7a40x/lowlevel_init.S')
| -rw-r--r-- | board/lpd7a40x/lowlevel_init.S | 212 |
1 files changed, 212 insertions, 0 deletions
diff --git a/board/lpd7a40x/lowlevel_init.S b/board/lpd7a40x/lowlevel_init.S new file mode 100644 index 0000000..b3ed55c --- /dev/null +++ b/board/lpd7a40x/lowlevel_init.S @@ -0,0 +1,212 @@ +/* + * Memory Setup - initialize memory controller(s) for devices required + * to boot and relocate + * + * See file CREDITS for list of people who contributed to this + * project. + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of the GNU General Public License as + * published by the Free Software Foundation; either version 2 of + * the License, or (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write to the Free Software + * Foundation, Inc., 59 Temple Place, Suite 330, Boston, + * MA 02111-1307 USA + */ + + +#include <config.h> +#include <version.h> + + +/* memory controller */ +#define BCRX_DEFAULT (0x0000fbe0) +#define BCRX_MW_8 (0x00000000) +#define BCRX_MW_16 (0x10000000) +#define BCRX_MW_32 (0x20000000) +#define BCRX_PME (0x08000000) +#define BCRX_WP (0x04000000) +#define BCRX_WST2_SHIFT (11) +#define BCRX_WST1_SHIFT (5) +#define BCRX_IDCY_SHIFT (0) + +/* Bank0 Async Flash */ +#define BCR0 (0x80002000) +#define BCR0_FLASH (BCRX_MW_32 | (0x08<<BCRX_WST2_SHIFT) | (0x0E<<BCRX_WST1_SHIFT)) + +/* Bank1 Open */ +#define BCR1 (0x80002004) + +/* Bank2 Not used (EEPROM?) */ +#define BCR2 (0x80002008) + +/* Bank3 Not used */ +#define BCR3 (0x8000200C) + +/* Bank4 PC Card1 */ + +/* Bank5 PC Card2 */ + +/* Bank6 CPLD IO Controller Peripherals (slow) */ +#define BCR6 (0x80002018) +#define BCR6_CPLD_SLOW (BCRX_DEFAULT | BCRX_MW_16) + +/* Bank7 CPLD IO Controller Peripherals (fast) */ +#define BCR7 (0x8000201C) +#define BCR7_CPLD_FAST (BCRX_MW_16 | (0x16<<BCRX_WST2_SHIFT) | (0x16<<BCRX_WST1_SHIFT) | (0x2<<BCRX_IDCY_SHIFT)) + +/* SDRAM */ +#define GBLCNFG (0x80002404) +#define GC_CKE (0x80000000) +#define GC_CKSD (0x40000000) +#define GC_LCR (0x00000040) +#define GC_SMEMBURST (0x00000020) +#define GC_MRS (0x00000002) +#define GC_INIT (0x00000001) + +#define GC_CMD_NORMAL (GC_CKE) +#define GC_CMD_MODE (GC_CKE | GC_MRS) +#define GC_CMD_SYNCFLASH_LOAD (GC_CKE | GC_MRS | GC_LCR) +#define GC_CMD_PRECHARGEALL (GC_CKE | GC_INIT) +#define GC_CMD_NOP (GC_CKE | GC_INIT | GC_MRS) + +#define RFSHTMR (0x80002408) +#define RFSHTMR_INIT (10) /* period=100 ns, HCLK=100Mhz, (2048+1-15.6*66) */ +#define RFSHTMR_NORMAL (1500) /* period=15.6 us, HCLK=100Mhz, (2048+1-15.6*66) */ + +#define SDCSCX_BASE (0x80002410) +#define SDCSCX_DEFAULT (0x01220008) +#define SDCSCX_AUTOPC (0x01000000) +#define SDCSCX_RAS2CAS_2 (0x00200000) +#define SDCSCX_RAS2CAS_3 (0x00300000) +#define SDCSCX_WBL (0x00080000) +#define SDCSCX_CASLAT_8 (0x00070000) +#define SDCSCX_CASLAT_7 (0x00060000) +#define SDCSCX_CASLAT_6 (0x00050000) +#define SDCSCX_CASLAT_5 (0x00040000) +#define SDCSCX_CASLAT_4 (0x00030000) +#define SDCSCX_CASLAT_3 (0x00020000) +#define SDCSCX_CASLAT_2 (0x00010000) +#define SDCSCX_2KPAGE (0x00000040) +#define SDCSCX_SROMLL (0x00000020) +#define SDCSCX_SROM512 (0x00000010) +#define SDCSCX_4BNK (0x00000008) +#define SDCSCX_2BNK (0x00000000) +#define SDCSCX_EBW_16 (0x00000004) +#define SDCSCX_EBW_32 (0x00000000) + +#define SDRAM_BASE (0xC0000000) +#define SDCSC_BANK_OFFSET (0x10000000) + +/* + * The SDRAM DEVICE MODE PROGRAMMING VALUE + */ +#define BURST_LENGTH_4 (2 << 10) +#define BURST_LENGTH_8 (3 << 10) +#define WBURST_LENGTH_BL (0 << 19) +#define WBURST_LENGTH_SINGLE (1 << 19) +#define CAS_2 (2 << 14) +#define CAS_3 (3 << 14) +#define BAT_SEQUENTIAL (0 << 13) +#define BAT_INTERLEAVED (1 << 13) +#define OPM_NORMAL (0 << 17) +#define SDRAM_DEVICE_MODE (WBURST_LENGTH_BL|OPM_NORMAL|CAS_3|BAT_SEQUENTIAL|BURST_LENGTH_4) + + +#define TIMER1_BASE (0x80000C00) + +/* + * special lookup flags + */ +#define DO_MEM_DELAY 1 +#define DO_MEM_READ 2 + +_TEXT_BASE: + .word TEXT_BASE + +.globl lowlevel_init +lowlevel_init: + mov r9, lr @ save return address + + /* memory control configuration */ + /* make r0 relative the current location so that it */ + /* reads INITMEM_DATA out of FLASH rather than memory ! */ + /* r0 = current word pointer */ + /* r1 = end word location, one word past last actual word */ + /* r3 = address for writes, special lookup flags */ + /* r4 = value for writes, delay constants, or read addresses */ + /* r2 = location for mem reads */ + + ldr r0, =INITMEM_DATA + ldr r1, _TEXT_BASE + sub r0, r0, r1 + add r1, r0, #112 + +mem_loop: + cmp r1, r0 + moveq pc, r9 @ Done + + ldr r3, [r0], #4 @ Fetch Destination Register Address, or 1 for delay + ldr r4, [r0], #4 @ value + + cmp r3, #DO_MEM_DELAY + bleq mem_delay + beq mem_loop + cmp r3, #DO_MEM_READ + ldreq r2, [r4] + beq mem_loop + str r4, [r3] @ normal register/ram store + b mem_loop + +mem_delay: + ldr r5, =TIMER1_BASE + mov r6, r4, LSR #1 @ timer resolution is ~2us + str r6, [r5] + mov r6, #0x88 @ using 508.469KHz clock, enable + str r6, [r5, #8] +0: ldr r6, [r5, #4] @ timer value + cmp r6, #0 + bne 0b + mov r6, #0 @ disable timer + str r6, [r5, #8] + mov pc, lr + + .ltorg +/* the literal pools origin */ + +INITMEM_DATA: + .word BCR0 + .word BCR0_FLASH + .word BCR6 + .word BCR6_CPLD_SLOW + .word BCR7 + .word BCR7_CPLD_FAST + .word SDCSCX_BASE + .word (SDCSCX_RAS2CAS_3 | SDCSCX_CASLAT_3 | SDCSCX_SROMLL | SDCSCX_4BNK | SDCSCX_EBW_32) + .word GBLCNFG + .word GC_CMD_NOP + .word DO_MEM_DELAY + .word 200 + .word GBLCNFG + .word GC_CMD_PRECHARGEALL + .word RFSHTMR + .word RFSHTMR_INIT + .word DO_MEM_DELAY + .word 8 + .word RFSHTMR + .word RFSHTMR_NORMAL + .word GBLCNFG + .word GC_CMD_MODE + .word DO_MEM_READ + .word (SDRAM_BASE | SDRAM_DEVICE_MODE) + .word GBLCNFG + .word GC_CMD_NORMAL + .word SDCSCX_BASE + .word (SDCSCX_AUTOPC | SDCSCX_RAS2CAS_3 | SDCSCX_CASLAT_3 | SDCSCX_SROMLL | SDCSCX_4BNK | SDCSCX_EBW_32) |