X-Git-Url: https://git.sur5r.net/?a=blobdiff_plain;f=arch%2Farm%2Fcpu%2Fpxa%2Fstart.S;h=f1dbc3b35d638819f6434e981bb32db7d3d1e0bc;hb=c04bf5e9a45d7335681352faa125193258f8e976;hp=3989fa61bc797e34b3a647f8bb76d1b714c8bdbb;hpb=54e19a7ded6e9dbdc3392a57d82f4f77b34e85b8;p=u-boot diff --git a/arch/arm/cpu/pxa/start.S b/arch/arm/cpu/pxa/start.S index 3989fa61bc..f1dbc3b35d 100644 --- a/arch/arm/cpu/pxa/start.S +++ b/arch/arm/cpu/pxa/start.S @@ -8,6 +8,7 @@ * Copyright (C) 2002 Kyle Harris * Copyright (C) 2003 Robert Schwebel * Copyright (C) 2003 Kai-Uwe Bloem + * Copyright (c) 2010 Marek Vasut * * See file CREDITS for list of people who contributed to this * project. @@ -28,12 +29,39 @@ * MA 02111-1307 USA */ +#include #include #include #include +/* takes care the CP15 update has taken place */ +.macro CPWAIT reg +mrc p15,0,\reg,c2,c0,0 +mov \reg,\reg +sub pc,pc,#4 +.endm + .globl _start _start: b reset +#ifdef CONFIG_PRELOADER + ldr pc, _hang + ldr pc, _hang + ldr pc, _hang + ldr pc, _hang + ldr pc, _hang + ldr pc, _hang + ldr pc, _hang + +_hang: + .word do_hang + .word 0x12345678 + .word 0x12345678 + .word 0x12345678 + .word 0x12345678 + .word 0x12345678 + .word 0x12345678 + .word 0x12345678 /* now 16*4=64 */ +#else ldr pc, _undefined_instruction ldr pc, _software_interrupt ldr pc, _prefetch_abort @@ -49,6 +77,7 @@ _data_abort: .word data_abort _not_used: .word not_used _irq: .word irq _fiq: .word fiq +#endif /* CONFIG_PRELOADER */ .balignl 16,0xdeadbeef @@ -62,23 +91,24 @@ _fiq: .word fiq * - jump to second stage */ +.globl _TEXT_BASE _TEXT_BASE: - .word TEXT_BASE - -.globl _armboot_start -_armboot_start: - .word _start + .word CONFIG_SYS_TEXT_BASE /* * These are defined in the board-specific linker script. */ -.globl _bss_start -_bss_start: - .word __bss_start +.globl _bss_start_ofs +_bss_start_ofs: + .word __bss_start - _start -.globl _bss_end -_bss_end: - .word _end +.globl _bss_end_ofs +_bss_end_ofs: + .word __bss_end__ - _start + +.globl _end_ofs +_end_ofs: + .word _end - _start #ifdef CONFIG_USE_IRQ /* IRQ stack memory (calculated at run-time) */ @@ -92,213 +122,262 @@ FIQ_STACK_START: .word 0x0badc0de #endif /* CONFIG_USE_IRQ */ +#ifndef CONFIG_PRELOADER +/* IRQ stack memory (calculated at run-time) + 8 bytes */ +.globl IRQ_STACK_START_IN +IRQ_STACK_START_IN: + .word 0x0badc0de -/****************************************************************************/ -/* */ -/* the actual reset code */ -/* */ -/****************************************************************************/ +/* + * the actual reset code + */ reset: - mrs r0,cpsr /* set the CPU to SVC32 mode */ - bic r0,r0,#0x1f /* (superviser mode, M=10011) */ - orr r0,r0,#0x13 + /* + * set the cpu to SVC32 mode + */ + mrs r0,cpsr + bic r0,r0,#0x1f + orr r0,r0,#0xd3 msr cpsr,r0 /* - * we do sys-critical inits only at reboot, - * not when booting from RAM! + * Enable MMU to use DCache as DRAM */ -#ifndef CONFIG_SKIP_LOWLEVEL_INIT - bl cpu_init_crit /* we do sys-critical inits */ -#endif /* !CONFIG_SKIP_LOWLEVEL_INIT */ - -#ifndef CONFIG_SKIP_RELOCATE_UBOOT -relocate: /* relocate U-Boot to RAM */ - adr r0, _start /* r0 <- current position of code */ - ldr r1, _TEXT_BASE /* test if we run from flash or RAM */ - cmp r0, r1 /* don't reloc during debug */ - beq stack_setup - - ldr r2, _armboot_start - ldr r3, _bss_start - sub r2, r3, r2 /* r2 <- size of armboot */ - add r2, r0, r2 /* r2 <- source end address */ + /* Domain access -- enable for all CPs */ + ldr r0, =0x0000ffff + mcr p15, 0, r0, c3, c0, 0 + + /* Point TTBR to MMU table */ + ldr r0, =mmu_table + adr r2, _start + orr r0, r2 + mcr p15, 0, r0, c2, c0, 0 + +/* !!! Hereby, check if the code is running from SRAM !!! */ +/* If the code is running from SRAM, alias SRAM to 0x0 to simulate NOR. The code + * is linked to 0x0 too, so this makes things easier. */ + cmp r2, #0x5c000000 + + ldreq r1, [r0] + orreq r1, r2 + streq r1, [r0] + + /* Kick in MMU, ICache, DCache, BTB */ + mrc p15, 0, r0, c1, c0, 0 + bic r0, #0x1b00 + bic r0, #0x0087 + orr r0, #0x1800 + orr r0, #0x0005 + mcr p15, 0, r0, c1, c0, 0 + CPWAIT r0 + + /* Unlock Icache, Dcache */ + mcr p15, 0, r0, c9, c1, 1 + mcr p15, 0, r0, c9, c2, 1 + + /* Flush Icache, Dcache, BTB */ + mcr p15, 0, r0, c7, c7, 0 + + /* Unlock I-TLB, D-TLB */ + mcr p15, 0, r0, c10, c4, 1 + mcr p15, 0, r0, c10, c8, 1 + + /* Flush TLB */ + mcr p15, 0, r0, c8, c7, 0 + /* Allocate 4096 bytes of Dcache as RAM */ + + /* Drain pending loads and stores */ + mcr p15, 0, r0, c7, c10, 4 + + mov r4, #0x00 + mov r5, #0x00 + mov r2, #0x01 + mcr p15, 0, r0, c9, c2, 0 + CPWAIT r0 + + /* 128 lines reserved (128 x 32bytes = 4096 bytes total) */ + mov r0, #128 + mov r1, #0xa0000000 +alloc: + mcr p15, 0, r1, c7, c2, 5 + /* Drain pending loads and stores */ + mcr p15, 0, r0, c7, c10, 4 + strd r4, [r1], #8 + strd r4, [r1], #8 + strd r4, [r1], #8 + strd r4, [r1], #8 + subs r0, #0x01 + bne alloc + /* Drain pending loads and stores */ + mcr p15, 0, r0, c7, c10, 4 + mov r2, #0x00 + mcr p15, 0, r2, c9, c2, 0 + CPWAIT r0 + + /* Jump to 0x0 ( + offset) if running from SRAM */ + adr r0, zerojmp + bic r0, #0x5c000000 + mov pc, r0 +zerojmp: + +/* Set stackpointer in internal RAM to call board_init_f */ +call_board_init_f: + ldr sp, =(CONFIG_SYS_INIT_SP_ADDR) + bic sp, sp, #7 /* 8-byte alignment for ABI compliance */ + ldr r0,=0x00000000 + bl board_init_f + +/*------------------------------------------------------------------------------*/ -copy_loop: - ldmia r0!, {r3-r10} /* copy from source address [r0] */ - stmia r1!, {r3-r10} /* copy to target address [r1] */ - cmp r0, r2 /* until source end address [r2] */ - ble copy_loop -#endif /* !CONFIG_SKIP_RELOCATE_UBOOT */ +/* + * void relocate_code (addr_sp, gd, addr_moni) + * + * This "function" does not return, instead it continues in RAM + * after relocating the monitor code. + * + */ + .globl relocate_code +relocate_code: + mov r4, r0 /* save addr_sp */ + mov r5, r1 /* save addr of gd */ + mov r6, r2 /* save addr of destination */ /* Set up the stack */ stack_setup: - ldr r0, _TEXT_BASE /* upper 128 KiB: relocated uboot */ - sub r0, r0, #CONFIG_SYS_MALLOC_LEN /* malloc area */ - sub r0, r0, #CONFIG_SYS_GBL_DATA_SIZE /* bdinfo */ -#ifdef CONFIG_USE_IRQ - sub r0, r0, #(CONFIG_STACKSIZE_IRQ+CONFIG_STACKSIZE_FIQ) -#endif /* CONFIG_USE_IRQ */ - sub r0, r0, #12 /* leave 3 words for abort-stack */ - bic sp, r0, #7 /* NOTE: stack MUST be aligned to */ - /* 8 bytes in case we want to use */ - /* 64bit datatypes (eg. VSPRINTF64) */ + mov sp, r4 + + adr r0, _start + cmp r0, r6 + beq clear_bss /* skip relocation */ + mov r1, r6 /* r1 <- scratch for copy_loop */ + ldr r3, _bss_start_ofs + add r2, r0, r3 /* r2 <- source end address */ + + stmfd sp!, {r0-r12} +copy_loop: + ldmia r0!, {r3-r5, r7-r11} /* copy from source address [r0] */ + stmia r1!, {r3-r5, r7-r11} /* copy to target address [r1] */ + cmp r0, r2 /* until source end address [r2] */ + blo copy_loop + ldmfd sp!, {r0-r12} + +#ifndef CONFIG_PRELOADER + /* + * fix .rel.dyn relocations + */ + ldr r0, _TEXT_BASE /* r0 <- Text base */ + sub r9, r6, r0 /* r9 <- relocation offset */ + ldr r10, _dynsym_start_ofs /* r10 <- sym table ofs */ + add r10, r10, r0 /* r10 <- sym table in FLASH */ + ldr r2, _rel_dyn_start_ofs /* r2 <- rel dyn start ofs */ + add r2, r2, r0 /* r2 <- rel dyn start in FLASH */ + ldr r3, _rel_dyn_end_ofs /* r3 <- rel dyn end ofs */ + add r3, r3, r0 /* r3 <- rel dyn end in FLASH */ +fixloop: + ldr r0, [r2] /* r0 <- location to fix up, IN FLASH! */ + add r0, r9 /* r0 <- location to fix up in RAM */ + ldr r1, [r2, #4] + and r7, r1, #0xff + cmp r7, #23 /* relative fixup? */ + beq fixrel + cmp r7, #2 /* absolute fixup? */ + beq fixabs + /* ignore unknown type of fixup */ + b fixnext +fixabs: + /* absolute fix: set location to (offset) symbol value */ + mov r1, r1, LSR #4 /* r1 <- symbol index in .dynsym */ + add r1, r10, r1 /* r1 <- address of symbol in table */ + ldr r1, [r1, #4] /* r1 <- symbol value */ + add r1, r1, r9 /* r1 <- relocated sym addr */ + b fixnext +fixrel: + /* relative fix: increase location by offset */ + ldr r1, [r0] + add r1, r1, r9 +fixnext: + str r1, [r0] + add r2, r2, #8 /* each rel.dyn entry is 8 bytes */ + cmp r2, r3 + blo fixloop +#endif /* #ifndef CONFIG_PRELOADER */ clear_bss: - ldr r0, _bss_start /* find start of bss segment */ - ldr r1, _bss_end /* stop here */ +#ifndef CONFIG_PRELOADER + ldr r0, _bss_start_ofs + ldr r1, _bss_end_ofs + mov r4, r6 /* reloc addr */ + add r0, r0, r4 + add r1, r1, r4 mov r2, #0x00000000 /* clear */ clbss_l:str r2, [r0] /* clear loop... */ add r0, r0, #4 cmp r0, r1 - ble clbss_l + bne clbss_l +#endif /* #ifndef CONFIG_PRELOADER */ - ldr pc, _start_armboot +/* + * We are done. Do not return, instead branch to second part of board + * initialization, now running from RAM. + */ +#ifdef CONFIG_ONENAND_IPL + ldr r0, _start_oneboot_ofs + mov pc, r0 + +_start_oneboot_ofs + : .word start_oneboot +#else + ldr r0, _board_init_r_ofs + adr r1, _start + add lr, r0, r1 + add lr, lr, r9 + /* setup parameters for board_init_r */ + mov r0, r5 /* gd_t */ + mov r1, r6 /* dest_addr */ + /* jump to it ... */ + mov pc, lr -_start_armboot: .word start_armboot +_board_init_r_ofs: + .word board_init_r - _start +#endif /* CONFIG_ONENAND_IPL */ +_rel_dyn_start_ofs: + .word __rel_dyn_start - _start +_rel_dyn_end_ofs: + .word __rel_dyn_end - _start +_dynsym_start_ofs: + .word __dynsym_start - _start + +#else /* CONFIG_PRELOADER */ /****************************************************************************/ /* */ -/* CPU_init_critical registers */ -/* */ -/* - setup important registers */ -/* - setup memory timing */ +/* the actual reset code for OneNAND IPL */ /* */ /****************************************************************************/ -/* mk@tbd: Fix this! */ -#undef RCSR -#undef ICMR -#undef OSMR3 -#undef OSCR -#undef OWER -#undef OIER -#undef CCCR - -/* Interrupt-Controller base address */ -IC_BASE: .word 0x40d00000 -#define ICMR 0x04 - -/* Reset-Controller */ -RST_BASE: .word 0x40f00030 -#define RCSR 0x00 - -/* Operating System Timer */ -OSTIMER_BASE: .word 0x40a00000 -#define OSMR3 0x0C -#define OSCR 0x10 -#define OWER 0x18 -#define OIER 0x1C - -/* Clock Manager Registers */ -#ifdef CONFIG_CPU_MONAHANS -# ifndef CONFIG_SYS_MONAHANS_RUN_MODE_OSC_RATIO -# error "You have to define CONFIG_SYS_MONAHANS_RUN_MODE_OSC_RATIO!!" -# endif /* !CONFIG_SYS_MONAHANS_RUN_MODE_OSC_RATIO */ -# ifndef CONFIG_SYS_MONAHANS_TURBO_RUN_MODE_RATIO -# define CONFIG_SYS_MONAHANS_TURBO_RUN_MODE_RATIO 0x1 -# endif /* !CONFIG_SYS_MONAHANS_TURBO_RUN_MODE_RATIO */ -#else /* !CONFIG_CPU_MONAHANS */ -#ifdef CONFIG_SYS_CPUSPEED -CC_BASE: .word 0x41300000 -#define CCCR 0x00 -cpuspeed: .word CONFIG_SYS_CPUSPEED -#else /* !CONFIG_SYS_CPUSPEED */ -#error "You have to define CONFIG_SYS_CPUSPEED!!" -#endif /* CONFIG_SYS_CPUSPEED */ -#endif /* CONFIG_CPU_MONAHANS */ - - /* takes care the CP15 update has taken place */ - .macro CPWAIT reg - mrc p15,0,\reg,c2,c0,0 - mov \reg,\reg - sub pc,pc,#4 - .endm - -cpu_init_crit: - - /* mask all IRQs */ -#ifndef CONFIG_CPU_MONAHANS - ldr r0, IC_BASE - mov r1, #0x00 - str r1, [r0, #ICMR] -#else /* CONFIG_CPU_MONAHANS */ - /* Step 1 - Enable CP6 permission */ - mrc p15, 0, r1, c15, c1, 0 @ read CPAR - orr r1, r1, #0x40 - mcr p15, 0, r1, c15, c1, 0 - CPWAIT r1 - - /* Step 2 - Mask ICMR & ICMR2 */ - mov r1, #0 - mcr p6, 0, r1, c1, c0, 0 @ ICMR - mcr p6, 0, r1, c7, c0, 0 @ ICMR2 - - /* turn off all clocks but the ones we will definitly require */ - ldr r1, =CKENA - ldr r2, =(CKENA_22_FFUART | CKENA_10_SRAM | CKENA_9_SMC | CKENA_8_DMC) - str r2, [r1] - ldr r1, =CKENB - ldr r2, =(CKENB_6_IRQ) - str r2, [r1] -#endif /* !CONFIG_CPU_MONAHANS */ - - /* set clock speed */ -#ifdef CONFIG_CPU_MONAHANS - ldr r0, =ACCR - ldr r1, =(((CONFIG_SYS_MONAHANS_TURBO_RUN_MODE_RATIO<<8) & ACCR_XN_MASK) | (CONFIG_SYS_MONAHANS_RUN_MODE_OSC_RATIO & ACCR_XL_MASK)) - str r1, [r0] -#else /* !CONFIG_CPU_MONAHANS */ -#ifdef CONFIG_SYS_CPUSPEED - ldr r0, CC_BASE - ldr r1, cpuspeed - str r1, [r0, #CCCR] - mov r0, #2 - mcr p14, 0, r0, c6, c0, 0 - -setspeed_done: - -#endif /* CONFIG_SYS_CPUSPEED */ -#endif /* CONFIG_CPU_MONAHANS */ - - /* - * before relocating, we have to setup RAM timing - * because memory timing is board-dependend, you will - * find a lowlevel_init.S in your board directory. - */ - mov ip, lr - bl lowlevel_init - mov lr, ip - - /* Memory interfaces are working. Disable MMU and enable I-cache. */ - /* mk: hmm, this is not in the monahans docs, leave it now but - * check here if it doesn't work :-) */ - - ldr r0, =0x2001 /* enable access to all coproc. */ - mcr p15, 0, r0, c15, c1, 0 - CPWAIT r0 - mcr p15, 0, r0, c7, c10, 4 /* drain the write & fill buffers */ - CPWAIT r0 +#ifndef CONFIG_PXA27X +#error OneNAND IPL is not supported on PXA25x and 26x due to lack of SRAM +#endif - mcr p15, 0, r0, c7, c7, 0 /* flush Icache, Dcache and BTB */ - CPWAIT r0 +reset: + /* Set CPU to SVC32 mode */ + mrs r0,cpsr + bic r0,r0,#0x1f + orr r0,r0,#0x13 + msr cpsr,r0 - mcr p15, 0, r0, c8, c7, 0 /* flush instuction and data TLBs */ - CPWAIT r0 + /* Point stack at the end of SRAM and leave 32 words for abort-stack */ + ldr sp, =0x5c03ff80 - /* Enable the Icache */ -/* - mrc p15, 0, r0, c1, c0, 0 - orr r0, r0, #0x1800 - mcr p15, 0, r0, c1, c0, 0 - CPWAIT -*/ - mov pc, lr + /* Start OneNAND IPL */ + ldr pc, =start_oneboot +#endif /* CONFIG_PRELOADER */ +#ifndef CONFIG_PRELOADER /****************************************************************************/ /* */ /* Interrupt handling */ @@ -338,9 +417,7 @@ setspeed_done: stmia sp, {r0 - r12} /* Calling r0-r12 */ add r8, sp, #S_PC - ldr r2, _armboot_start - sub r2, r2, #(CONFIG_STACKSIZE+CONFIG_SYS_MALLOC_LEN) - sub r2, r2, #(CONFIG_SYS_GBL_DATA_SIZE+8) @ set base 2 words into abort stack + ldr r2, IRQ_STACK_START_IN ldmia r2, {r2 - r4} /* get pc, cpsr, old_r0 */ add r0, sp, #S_FRAME_SIZE /* restore sp_SVC */ @@ -375,9 +452,7 @@ setspeed_done: .endm .macro get_bad_stack - ldr r13, _armboot_start @ setup our mode stack - sub r13, r13, #(CONFIG_STACKSIZE+CONFIG_SYS_MALLOC_LEN) - sub r13, r13, #(CONFIG_SYS_GBL_DATA_SIZE+8) @ reserved a couple spots in abort stack + ldr r13, IRQ_STACK_START_IN @ setup our mode stack str lr, [r13] @ save caller lr / spsr mrs lr, spsr @@ -396,6 +471,7 @@ setspeed_done: .macro get_fiq_stack @ setup FIQ stack ldr sp, FIQ_STACK_START .endm +#endif /* CONFIG_PRELOADER /****************************************************************************/ @@ -404,6 +480,12 @@ setspeed_done: /* */ /****************************************************************************/ +#ifdef CONFIG_PRELOADER + .align 5 +do_hang: + ldr sp, _TEXT_BASE /* use 32 words abort stack */ + bl hang /* hang and never return */ +#else .align 5 undefined_instruction: get_bad_stack @@ -463,7 +545,7 @@ fiq: get_bad_stack bad_save_user_regs bl do_fiq - +#endif /* CONFIG_PRELOADER */ #endif /* CONFIG_USE_IRQ */ /****************************************************************************/ @@ -472,8 +554,8 @@ fiq: /* perform a watchdog timeout for a soft reset. */ /* */ /****************************************************************************/ - - .align 5 +/* Operating System Timer */ +.align 5 .globl reset_cpu /* FIXME: this code is PXA250 specific. How is this handled on */ @@ -483,19 +565,43 @@ reset_cpu: /* We set OWE:WME (watchdog enable) and wait until timeout happens */ - ldr r0, OSTIMER_BASE - ldr r1, [r0, #OWER] + ldr r0, =OWER + ldr r1, [r0] orr r1, r1, #0x0001 /* bit0: WME */ - str r1, [r0, #OWER] + str r1, [r0] /* OS timer does only wrap every 1165 seconds, so we have to set */ /* the match register as well. */ - ldr r1, [r0, #OSCR] /* read OS timer */ + ldr r0, =OSCR + ldr r1, [r0] /* read OS timer */ add r1, r1, #0x800 /* let OSMR3 match after */ add r1, r1, #0x800 /* 4096*(1/3.6864MHz)=1ms */ - str r1, [r0, #OSMR3] + ldr r0, =OSMR3 + str r1, [r0] reset_endless: b reset_endless + +#ifndef CONFIG_PRELOADER +.section .mmudata, "a" + .align 14 + .globl mmu_table +mmu_table: + /* 0x00000000 - 0xa0000000 : 1:1, uncached mapping */ + .set __base, 0 + .rept 0xa00 + .word (__base << 20) | 0xc12 + .set __base, __base + 1 + .endr + + /* 0xa0000000 - 0xa0100000 : 1:1, cached mapping */ + .word (0xa00 << 20) | 0x1c1e + + .set __base, 0xa01 + .rept 0x1000 - 0xa01 + .word (__base << 20) | 0xc12 + .set __base, __base + 1 + .endr +#endif /* CONFIG_PRELOADER */