| /* |
| * 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) |