diff options
Diffstat (limited to 'arch')
| -rw-r--r-- | arch/arm/cpu/arm926ejs/orion5x/lowlevel_init.S | 140 |
1 files changed, 70 insertions, 70 deletions
diff --git a/arch/arm/cpu/arm926ejs/orion5x/lowlevel_init.S b/arch/arm/cpu/arm926ejs/orion5x/lowlevel_init.S index b0e15f6..0523bd4 100644 --- a/arch/arm/cpu/arm926ejs/orion5x/lowlevel_init.S +++ b/arch/arm/cpu/arm926ejs/orion5x/lowlevel_init.S @@ -87,30 +87,30 @@ lowlevel_init: /* Use 'r4 as the base for internal register accesses */ - ldr r4, =ORION5X_REGS_PHY_BASE + ldr r4, =ORION5X_REGS_PHY_BASE /* move internal registers from the default 0xD0000000 * to their intended location, defined by SoC */ ldr r3, =0xD0000000 add r3, r3, #0x20000 - str r4, [r3, #0x80] + str r4, [r3, #0x80] /* Use R3 as the base for DRAM registers */ - add r3, r4, #0x01000 + add r3, r4, #0x01000 /*DDR SDRAM Initialization Control */ ldr r6, =0x00000001 str r6, [r3, #0x480] /* Use R3 as the base for PCI registers */ - add r3, r4, #0x31000 + add r3, r4, #0x31000 /* Disable arbiter */ ldr r6, =0x00000030 str r6, [r3, #0xd00] /* Use R3 as the base for DRAM registers */ - add r3, r4, #0x01000 + add r3, r4, #0x01000 /* set all dram windows to 0 */ mov r6, #0 @@ -127,63 +127,63 @@ lowlevel_init: ldr r6, =SDRAM_CONTROL str r6, [r3, #0x404] - /* 3) Write SDRAM address control register */ + /* 3) Write SDRAM address control register */ ldr r6, =SDRAM_ADDR_CTRL str r6, [r3, #0x410] - /* 4) Write SDRAM bank 0 size register */ + /* 4) Write SDRAM bank 0 size register */ ldr r6, =SDRAM_BANK0_SIZE str r6, [r3, #0x504] /* keep other banks disabled */ - /* 5) Write SDRAM open pages control register */ + /* 5) Write SDRAM open pages control register */ ldr r6, =SDRAM_OPEN_PAGE_EN str r6, [r3, #0x414] - /* 6) Write SDRAM timing Low register */ + /* 6) Write SDRAM timing Low register */ ldr r6, =SDRAM_TIME_CTRL_LOW str r6, [r3, #0x408] - /* 7) Write SDRAM timing High register */ + /* 7) Write SDRAM timing High register */ ldr r6, =SDRAM_TIME_CTRL_HI str r6, [r3, #0x40C] - /* 8) Write SDRAM mode register */ - /* The CPU must not attempt to change the SDRAM Mode register setting */ - /* prior to DRAM controller completion of the DRAM initialization */ - /* sequence. To guarantee this restriction, it is recommended that */ - /* the CPU sets the SDRAM Operation register to NOP command, performs */ - /* read polling until the register is back in Normal operation value, */ - /* and then sets SDRAM Mode register to its new value. */ + /* 8) Write SDRAM mode register */ + /* The CPU must not attempt to change the SDRAM Mode register setting */ + /* prior to DRAM controller completion of the DRAM initialization */ + /* sequence. To guarantee this restriction, it is recommended that */ + /* the CPU sets the SDRAM Operation register to NOP command, performs */ + /* read polling until the register is back in Normal operation value, */ + /* and then sets SDRAM Mode register to its new value. */ /* 8.1 write 'nop' to SDRAM operation */ - ldr r6, =SDRAM_OP_NOP + ldr r6, =SDRAM_OP_NOP str r6, [r3, #0x418] - /* 8.2 poll SDRAM operation until back in 'normal' mode. */ + /* 8.2 poll SDRAM operation until back in 'normal' mode. */ 1: ldr r6, [r3, #0x418] cmp r6, #0 bne 1b - /* 8.3 Now its safe to write new value to SDRAM Mode register */ + /* 8.3 Now its safe to write new value to SDRAM Mode register */ ldr r6, =SDRAM_MODE str r6, [r3, #0x41C] - /* 8.4 Set new mode */ - ldr r6, =SDRAM_OP_SETMODE + /* 8.4 Set new mode */ + ldr r6, =SDRAM_OP_SETMODE str r6, [r3, #0x418] - /* 8.5 poll SDRAM operation until back in 'normal' mode. */ + /* 8.5 poll SDRAM operation until back in 'normal' mode. */ 2: ldr r6, [r3, #0x418] cmp r6, #0 bne 2b - /* DDR SDRAM Address/Control Pads Calibration */ + /* DDR SDRAM Address/Control Pads Calibration */ ldr r6, [r3, #0x4C0] - /* Set Bit [31] to make the register writable */ + /* Set Bit [31] to make the register writable */ orr r6, r6, #SDRAM_PAD_CTRL_WR_EN str r6, [r3, #0x4C0] @@ -192,20 +192,20 @@ lowlevel_init: bic r6, r6, #SDRAM_PAD_CTRL_DRVN_MASK bic r6, r6, #SDRAM_PAD_CTRL_DRVP_MASK - /* Get the final N locked value of driving strength [22:17] */ - mov r1, r6 - mov r1, r1, LSL #9 - mov r1, r1, LSR #26 /* r1[5:0]<DrvN> = r3[22:17]<LockN> */ - orr r1, r1, r1, LSL #6 /* r1[11:6]<DrvP> = r1[5:0]<DrvN> */ + /* Get the final N locked value of driving strength [22:17] */ + mov r1, r6 + mov r1, r1, LSL #9 + mov r1, r1, LSR #26 /* r1[5:0]<DrvN> = r3[22:17]<LockN> */ + orr r1, r1, r1, LSL #6 /* r1[11:6]<DrvP> = r1[5:0]<DrvN> */ - /* Write to both <DrvN> bits [5:0] and <DrvP> bits [11:6] */ + /* Write to both <DrvN> bits [5:0] and <DrvP> bits [11:6] */ orr r6, r6, r1 str r6, [r3, #0x4C0] - /* DDR SDRAM Data Pads Calibration */ + /* DDR SDRAM Data Pads Calibration */ ldr r6, [r3, #0x4C4] - /* Set Bit [31] to make the register writable */ + /* Set Bit [31] to make the register writable */ orr r6, r6, #SDRAM_PAD_CTRL_WR_EN str r6, [r3, #0x4C4] @@ -214,21 +214,21 @@ lowlevel_init: bic r6, r6, #SDRAM_PAD_CTRL_DRVN_MASK bic r6, r6, #SDRAM_PAD_CTRL_DRVP_MASK - /* Get the final N locked value of driving strength [22:17] */ - mov r1, r6 - mov r1, r1, LSL #9 - mov r1, r1, LSR #26 - orr r1, r1, r1, LSL #6 /* r1[5:0] = r3[22:17]<LockN> */ + /* Get the final N locked value of driving strength [22:17] */ + mov r1, r6 + mov r1, r1, LSL #9 + mov r1, r1, LSR #26 + orr r1, r1, r1, LSL #6 /* r1[5:0] = r3[22:17]<LockN> */ - /* Write to both <DrvN> bits [5:0] and <DrvP> bits [11:6] */ + /* Write to both <DrvN> bits [5:0] and <DrvP> bits [11:6] */ orr r6, r6, r1 str r6, [r3, #0x4C4] - /* Implement Guideline (GL# MEM-3) Drive Strength Value */ - /* Relevant for: 88F5181-A1/B0/B1 and 88F5281-A0/B0 */ + /* Implement Guideline (GL# MEM-3) Drive Strength Value */ + /* Relevant for: 88F5181-A1/B0/B1 and 88F5281-A0/B0 */ - ldr r1, =DDR1_PAD_STRENGTH_DEFAULT + ldr r1, =DDR1_PAD_STRENGTH_DEFAULT /* Enable writes to DDR SDRAM Addr/Ctrl Pads Calibration register */ ldr r6, [r3, #0x4C0] @@ -252,42 +252,42 @@ lowlevel_init: orr r6, r6, r1 str r6, [r3, #0x4C4] - /* Implement Guideline (GL# MEM-4) DQS Reference Delay Tuning */ - /* Relevant for: 88F5181-A1/B0/B1 and 88F5281-A0/B0 */ + /* Implement Guideline (GL# MEM-4) DQS Reference Delay Tuning */ + /* Relevant for: 88F5181-A1/B0/B1 and 88F5281-A0/B0 */ - /* Get the "sample on reset" register for the DDR frequancy */ + /* Get the "sample on reset" register for the DDR frequancy */ ldr r3, =0x10000 - ldr r6, [r3, #0x010] - ldr r1, =MSAR_ARMDDRCLCK_MASK - and r1, r6, r1 - - ldr r6, =FTDLL_DDR1_166MHZ - cmp r1, #MSAR_ARMDDRCLCK_333_167 - beq 3f - cmp r1, #MSAR_ARMDDRCLCK_500_167 - beq 3f - cmp r1, #MSAR_ARMDDRCLCK_667_167 - beq 3f - - ldr r6, =FTDLL_DDR1_200MHZ - cmp r1, #MSAR_ARMDDRCLCK_400_200_1 - beq 3f - cmp r1, #MSAR_ARMDDRCLCK_400_200 - beq 3f - cmp r1, #MSAR_ARMDDRCLCK_600_200 - beq 3f - cmp r1, #MSAR_ARMDDRCLCK_800_200 - beq 3f - - ldr r6, =0 + ldr r6, [r3, #0x010] + ldr r1, =MSAR_ARMDDRCLCK_MASK + and r1, r6, r1 + + ldr r6, =FTDLL_DDR1_166MHZ + cmp r1, #MSAR_ARMDDRCLCK_333_167 + beq 3f + cmp r1, #MSAR_ARMDDRCLCK_500_167 + beq 3f + cmp r1, #MSAR_ARMDDRCLCK_667_167 + beq 3f + + ldr r6, =FTDLL_DDR1_200MHZ + cmp r1, #MSAR_ARMDDRCLCK_400_200_1 + beq 3f + cmp r1, #MSAR_ARMDDRCLCK_400_200 + beq 3f + cmp r1, #MSAR_ARMDDRCLCK_600_200 + beq 3f + cmp r1, #MSAR_ARMDDRCLCK_800_200 + beq 3f + + ldr r6, =0 3: /* Use R3 as the base for DRAM registers */ - add r3, r4, #0x01000 + add r3, r4, #0x01000 ldr r2, [r3, #0x484] orr r2, r2, r6 str r2, [r3, #0x484] /* Return to U-boot via saved link register */ - mov pc, lr + mov pc, lr |