diff options
Diffstat (limited to 'arch/arm/cpu/arm926ejs')
-rw-r--r-- | arch/arm/cpu/arm926ejs/at91/clock.c | 55 | ||||
-rw-r--r-- | arch/arm/cpu/arm926ejs/at91/timer.c | 85 | ||||
-rw-r--r-- | arch/arm/cpu/arm926ejs/start.S | 162 | ||||
-rw-r--r-- | arch/arm/cpu/arm926ejs/u-boot.lds | 26 |
4 files changed, 167 insertions, 161 deletions
diff --git a/arch/arm/cpu/arm926ejs/at91/clock.c b/arch/arm/cpu/arm926ejs/at91/clock.c index ecf91f5..7a10a77 100644 --- a/arch/arm/cpu/arm926ejs/at91/clock.c +++ b/arch/arm/cpu/arm926ejs/at91/clock.c @@ -11,47 +11,46 @@ * (at your option) any later version. */ -#include <config.h> +#include <common.h> #include <asm/arch/hardware.h> #include <asm/arch/io.h> #include <asm/arch/at91_pmc.h> #include <asm/arch/clk.h> -static unsigned long cpu_clk_rate_hz; -static unsigned long main_clk_rate_hz; -static unsigned long mck_rate_hz; -static unsigned long plla_rate_hz; -static unsigned long pllb_rate_hz; -static u32 at91_pllb_usb_init; +#if !defined(CONFIG_AT91FAMILY) +# error You need to define CONFIG_AT91FAMILY in your board config! +#endif + +DECLARE_GLOBAL_DATA_PTR; unsigned long get_cpu_clk_rate(void) { - return cpu_clk_rate_hz; + return gd->cpu_clk_rate_hz; } unsigned long get_main_clk_rate(void) { - return main_clk_rate_hz; + return gd->main_clk_rate_hz; } unsigned long get_mck_clk_rate(void) { - return mck_rate_hz; + return gd->mck_rate_hz; } unsigned long get_plla_clk_rate(void) { - return plla_rate_hz; + return gd->plla_rate_hz; } unsigned long get_pllb_clk_rate(void) { - return pllb_rate_hz; + return gd->pllb_rate_hz; } u32 get_pllb_init(void) { - return at91_pllb_usb_init; + return gd->at91_pllb_usb_init; } static unsigned long at91_css_to_rate(unsigned long css) @@ -60,11 +59,11 @@ static unsigned long at91_css_to_rate(unsigned long css) case AT91_PMC_MCKR_CSS_SLOW: return AT91_SLOW_CLOCK; case AT91_PMC_MCKR_CSS_MAIN: - return main_clk_rate_hz; + return gd->main_clk_rate_hz; case AT91_PMC_MCKR_CSS_PLLA: - return plla_rate_hz; + return gd->plla_rate_hz; case AT91_PMC_MCKR_CSS_PLLB: - return pllb_rate_hz; + return gd->pllb_rate_hz; } return 0; @@ -163,10 +162,10 @@ int at91_clock_init(unsigned long main_clock) main_clock = tmp * (AT91_SLOW_CLOCK / 16); } #endif - main_clk_rate_hz = main_clock; + gd->main_clk_rate_hz = main_clock; /* report if PLLA is more than mildly overclocked */ - plla_rate_hz = at91_pll_rate(main_clock, readl(&pmc->pllar)); + gd->plla_rate_hz = at91_pll_rate(main_clock, readl(&pmc->pllar)); #ifdef CONFIG_USB_ATMEL /* @@ -175,9 +174,9 @@ int at91_clock_init(unsigned long main_clock) * * REVISIT: assumes MCK doesn't derive from PLLB! */ - at91_pllb_usb_init = at91_pll_calc(main_clock, 48000000 * 2) | + gd->at91_pllb_usb_init = at91_pll_calc(main_clock, 48000000 * 2) | AT91_PMC_PLLBR_USBDIV_2; - pllb_rate_hz = at91_pll_rate(main_clock, at91_pllb_usb_init); + gd->pllb_rate_hz = at91_pll_rate(main_clock, gd->at91_pllb_usb_init); #endif /* @@ -187,30 +186,30 @@ int at91_clock_init(unsigned long main_clock) mckr = readl(&pmc->mckr); #if defined(CONFIG_AT91SAM9G45) || defined(CONFIG_AT91SAM9M10G45) /* plla divisor by 2 */ - plla_rate_hz /= (1 << ((mckr & 1 << 12) >> 12)); + gd->plla_rate_hz /= (1 << ((mckr & 1 << 12) >> 12)); #endif - mck_rate_hz = at91_css_to_rate(mckr & AT91_PMC_MCKR_CSS_MASK); - freq = mck_rate_hz; + gd->mck_rate_hz = at91_css_to_rate(mckr & AT91_PMC_MCKR_CSS_MASK); + freq = gd->mck_rate_hz; freq /= (1 << ((mckr & AT91_PMC_MCKR_PRES_MASK) >> 2)); /* prescale */ #if defined(CONFIG_AT91RM9200) /* mdiv */ - mck_rate_hz = freq / (1 + ((mckr & AT91_PMC_MCKR_MDIV_MASK) >> 8)); + gd->mck_rate_hz = freq / (1 + ((mckr & AT91_PMC_MCKR_MDIV_MASK) >> 8)); #elif defined(CONFIG_AT91SAM9G20) /* mdiv ; (x >> 7) = ((x >> 8) * 2) */ - mck_rate_hz = (mckr & AT91_PMC_MCKR_MDIV_MASK) ? + gd->mck_rate_hz = (mckr & AT91_PMC_MCKR_MDIV_MASK) ? freq / ((mckr & AT91_PMC_MCKR_MDIV_MASK) >> 7) : freq; if (mckr & AT91_PMC_MCKR_MDIV_MASK) freq /= 2; /* processor clock division */ #elif defined(CONFIG_AT91SAM9G45) || defined(CONFIG_AT91SAM9M10G45) - mck_rate_hz = (mckr & AT91_PMC_MCKR_MDIV_MASK) == + gd->mck_rate_hz = (mckr & AT91_PMC_MCKR_MDIV_MASK) == (AT91_PMC_MCKR_MDIV_2 | AT91_PMC_MCKR_MDIV_4) ? freq / 3 : freq / (1 << ((mckr & AT91_PMC_MCKR_MDIV_MASK) >> 8)); #else - mck_rate_hz = freq / (1 << ((mckr & AT91_PMC_MCKR_MDIV_MASK) >> 8)); + gd->mck_rate_hz = freq / (1 << ((mckr & AT91_PMC_MCKR_MDIV_MASK) >> 8)); #endif - cpu_clk_rate_hz = freq; + gd->cpu_clk_rate_hz = freq; return 0; } diff --git a/arch/arm/cpu/arm926ejs/at91/timer.c b/arch/arm/cpu/arm926ejs/at91/timer.c index 8efc34b..82b8d7e 100644 --- a/arch/arm/cpu/arm926ejs/at91/timer.c +++ b/arch/arm/cpu/arm926ejs/at91/timer.c @@ -30,55 +30,63 @@ #include <asm/arch/io.h> #include <div64.h> +#if !defined(CONFIG_AT91FAMILY) +# error You need to define CONFIG_AT91FAMILY in your board config! +#endif + +DECLARE_GLOBAL_DATA_PTR; + /* * We're using the AT91CAP9/SAM9 PITC in 32 bit mode, by * setting the 20 bit counter period to its maximum (0xfffff). + * (See the relevant data sheets to understand that this really works) + * + * We do also mimic the typical powerpc way of incrementing + * two 32 bit registers called tbl and tbu. + * + * Those registers increment at 1/16 the main clock rate. */ -#define TIMER_LOAD_VAL 0xfffff -static ulong timestamp; -static ulong lastinc; -static ulong timer_freq; +#define TIMER_LOAD_VAL 0xfffff static inline unsigned long long tick_to_time(unsigned long long tick) { tick *= CONFIG_SYS_HZ; - do_div(tick, timer_freq); + do_div(tick, gd->timer_rate_hz); return tick; } static inline unsigned long long usec_to_tick(unsigned long long usec) { - usec *= timer_freq; + usec *= gd->timer_rate_hz; do_div(usec, 1000000); return usec; } -/* nothing really to do with interrupts, just starts up a counter. */ +/* + * Use the PITC in full 32 bit incrementing mode + */ int timer_init(void) { at91_pmc_t *pmc = (at91_pmc_t *) AT91_PMC_BASE; at91_pit_t *pit = (at91_pit_t *) AT91_PIT_BASE; - /* - * Enable PITC Clock - * The clock is already enabled for system controller in boot - */ + + /* Enable PITC Clock */ writel(1 << AT91_ID_SYS, &pmc->pcer); /* Enable PITC */ writel(TIMER_LOAD_VAL | AT91_PIT_MR_EN , &pit->mr); - reset_timer_masked(); - - timer_freq = get_mck_clk_rate() >> 4; + gd->timer_rate_hz = gd->mck_rate_hz / 16; + gd->tbu = gd->tbl = 0; return 0; } /* - * timer without interrupts + * Get the current 64 bit timer tick count */ unsigned long long get_ticks(void) { @@ -86,28 +94,11 @@ unsigned long long get_ticks(void) ulong now = readl(&pit->piir); - if (now >= lastinc) /* normal mode (non roll) */ - /* move stamp forward with absolut diff ticks */ - timestamp += (now - lastinc); - else /* we have rollover of incrementer */ - timestamp += (0xFFFFFFFF - lastinc) + now; - lastinc = now; - return timestamp; -} - -void reset_timer_masked(void) -{ - /* reset time */ - at91_pit_t *pit = (at91_pit_t *) AT91_PIT_BASE; - - /* capture current incrementer value time */ - lastinc = readl(&pit->piir); - timestamp = 0; /* start "advancing" time stamp from 0 */ -} - -ulong get_timer_masked(void) -{ - return tick_to_time(get_ticks()); + /* increment tbu if tbl has rolled over */ + if (now < gd->tbl) + gd->tbu++; + gd->tbl = now; + return (((unsigned long long)gd->tbu) << 32) | gd->tbl; } void __udelay(unsigned long usec) @@ -119,24 +110,32 @@ void __udelay(unsigned long usec) tmp = get_ticks() + tmo; /* get current timestamp */ while (get_ticks() < tmp) /* loop till event */ - /*NOP*/; + ; } +/* + * reset_timer() and get_timer(base) are a pair of functions that are used by + * some timeout/sleep mechanisms in u-boot. + * + * reset_timer() marks the current time as epoch and + * get_timer(base) works relative to that epoch. + * + * The time is used in CONFIG_SYS_HZ units! + */ void reset_timer(void) { - reset_timer_masked(); + gd->timer_reset_value = get_ticks(); } ulong get_timer(ulong base) { - return get_timer_masked () - base; + return tick_to_time(get_ticks() - gd->timer_reset_value) - base; } /* - * This function is derived from PowerPC code (timebase clock frequency). - * On ARM it returns the number of timer ticks per second. + * Return the number of timer ticks per second. */ ulong get_tbclk(void) { - return timer_freq; + return gd->timer_rate_hz; } diff --git a/arch/arm/cpu/arm926ejs/start.S b/arch/arm/cpu/arm926ejs/start.S index 8cbe3e7..863de3b 100644 --- a/arch/arm/cpu/arm926ejs/start.S +++ b/arch/arm/cpu/arm926ejs/start.S @@ -10,6 +10,7 @@ * Copyright (c) 2002 Gary Jennejohn <garyj@denx.de> * Copyright (c) 2003 Richard Woodruff <r-woodruff2@ti.com> * Copyright (c) 2003 Kshitij <kshitij@ti.com> + * Copyright (c) 2010 Albert Aribaud <albert.aribaud@free.fr> * * See file CREDITS for list of people who contributed to this * project. @@ -118,22 +119,19 @@ _fiq: _TEXT_BASE: .word CONFIG_SYS_TEXT_BASE -#if defined(CONFIG_SYS_ARM_WITHOUT_RELOC) -.globl _armboot_start -_armboot_start: - .word _start -#endif - /* * These are defined in the board-specific linker script. + * Subtracting _start from them lets the linker put their + * relative position in the executable instead of leaving + * them null. */ -.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 _end - _start #ifdef CONFIG_USE_IRQ /* IRQ stack memory (calculated at run-time) */ @@ -153,30 +151,6 @@ FIQ_STACK_START: IRQ_STACK_START_IN: .word 0x0badc0de -.globl _datarel_start -_datarel_start: - .word __datarel_start - -.globl _datarelrolocal_start -_datarelrolocal_start: - .word __datarelrolocal_start - -.globl _datarellocal_start -_datarellocal_start: - .word __datarellocal_start - -.globl _datarelro_start -_datarelro_start: - .word __datarelro_start - -.globl _got_start -_got_start: - .word __got_start - -.globl _got_end -_got_end: - .word __got_end - /* * the actual reset code */ @@ -226,9 +200,8 @@ stack_setup: adr r0, _start ldr r2, _TEXT_BASE - ldr r3, _bss_start - sub r2, r3, r2 /* r2 <- size of armboot */ - add r2, r0, r2 /* r2 <- source end address */ + ldr r3, _bss_start_ofs + add r2, r0, r3 /* r2 <- source end address */ cmp r0, r6 beq clear_bss @@ -240,36 +213,54 @@ copy_loop: blo copy_loop #ifndef CONFIG_PRELOADER - /* fix got entries */ - ldr r1, _TEXT_BASE /* Text base */ - mov r0, r7 /* reloc addr */ - ldr r2, _got_start /* addr in Flash */ - ldr r3, _got_end /* addr in Flash */ - sub r3, r3, r1 - add r3, r3, r0 - sub r2, r2, r1 - add r2, r2, r0 - + /* + * fix .rel.dyn relocations + */ + ldr r0, _TEXT_BASE /* r0 <- Text base */ + sub r9, r7, 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 r4, [r2] - sub r4, r4, r1 - add r4, r4, r0 - str r4, [r2] - add r2, r2, #4 + 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 r8, r1, #0xff + cmp r8, #23 /* relative fixup? */ + beq fixrel + cmp r8, #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, 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 - bne fixloop + blo fixloop #endif #endif /* #ifndef CONFIG_SKIP_RELOCATE_UBOOT */ clear_bss: #ifndef CONFIG_PRELOADER - ldr r0, _bss_start - ldr r1, _bss_end + ldr r0, _bss_start_ofs + ldr r1, _bss_end_ofs ldr r3, _TEXT_BASE /* Text base */ mov r4, r7 /* reloc addr */ - sub r0, r0, r3 add r0, r0, r4 - sub r1, r1, r3 add r1, r1, r4 mov r2, #0x00000000 /* clear */ @@ -287,24 +278,33 @@ clbss_l:str r2, [r0] /* clear loop... */ * initialization, now running from RAM. */ #ifdef CONFIG_NAND_SPL - ldr pc, _nand_boot + ldr r0, _nand_boot_ofs + mov pc, r0 -_nand_boot: .word nand_boot +_nand_boot_ofs: + .word nand_boot #else - ldr r0, _TEXT_BASE - ldr r2, _board_init_r - sub r2, r2, r0 - add r2, r2, r7 /* position from board_init_r in RAM */ + ldr r0, _board_init_r_ofs + adr r1, _start + add r0, r0, r1 + add lr, r0, r9 /* setup parameters for board_init_r */ mov r0, r5 /* gd_t */ mov r1, r7 /* dest_addr */ /* jump to it ... */ - mov lr, r2 mov pc, lr -_board_init_r: .word board_init_r +_board_init_r_ofs: + .word board_init_r - _start #endif +_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 /* #if !defined(CONFIG_SYS_ARM_WITHOUT_RELOC) */ /* * the actual reset code @@ -333,10 +333,8 @@ relocate: /* relocate U-Boot to RAM */ 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 */ + ldr r3, _bss_start_ofs /* r3 <- _bss_start - _start */ + add r2, r0, r3 /* r2 <- source end address */ copy_loop: ldmia r0!, {r3-r10} /* copy from source address [r0] */ @@ -360,8 +358,11 @@ stack_setup: bic sp, sp, #7 /* 8-byte alignment for ABI compliance */ clear_bss: - ldr r0, _bss_start /* find start of bss segment */ - ldr r1, _bss_end /* stop here */ + adr r2, _start + ldr r0, _bss_start_ofs /* find start of bss segment */ + add r0, r0, r2 + ldr r1, _bss_end_ofs /* stop here */ + add r1, r1, r2 mov r2, #0x00000000 /* clear */ #ifndef CONFIG_PRELOADER @@ -374,13 +375,16 @@ clbss_l:str r2, [r0] /* clear loop... */ bl red_LED_on #endif /* CONFIG_PRELOADER */ - ldr pc, _start_armboot + ldr r0, _start_armboot_ofs + adr r1, _start + add r0, r0, r1 + ldr pc, r0 -_start_armboot: +_start_armboot_ofs: #ifdef CONFIG_NAND_SPL - .word nand_boot + .word nand_boot - _start #else - .word start_armboot + .word start_armboot - _start #endif /* CONFIG_NAND_SPL */ #endif /* #if !defined(CONFIG_SYS_ARM_WITHOUT_RELOC) */ @@ -469,7 +473,7 @@ cpu_init_crit: sub sp, sp, #S_FRAME_SIZE stmia sp, {r0 - r12} @ Save user registers (now in svc mode) r0-r12 #if defined(CONFIG_SYS_ARM_WITHOUT_RELOC) - ldr r2, _armboot_start + adr r2, _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 #else @@ -507,7 +511,7 @@ cpu_init_crit: .macro get_bad_stack #if defined(CONFIG_SYS_ARM_WITHOUT_RELOC) - ldr r13, _armboot_start @ setup our mode stack + adr r13, _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 #else diff --git a/arch/arm/cpu/arm926ejs/u-boot.lds b/arch/arm/cpu/arm926ejs/u-boot.lds index 02eb8ca..72f45f8 100644 --- a/arch/arm/cpu/arm926ejs/u-boot.lds +++ b/arch/arm/cpu/arm926ejs/u-boot.lds @@ -41,21 +41,19 @@ SECTIONS . = ALIGN(4); .data : { *(.data) - __datarel_start = .; - *(.data.rel) - __datarelrolocal_start = .; - *(.data.rel.ro.local) - __datarellocal_start = .; - *(.data.rel.local) - __datarelro_start = .; - *(.data.rel.ro) } - __got_start = .; . = ALIGN(4); - .got : { *(.got) } - __got_end = .; + __rel_dyn_start = .; + .rel.dyn : { *(.rel.dyn) } + __rel_dyn_end = .; + + __dynsym_start = .; + .dynsym : { *(.dynsym) } + + . = ALIGN(4); + . = .; __u_boot_cmd_start = .; .u_boot_cmd : { *(.u_boot_cmd) } @@ -65,4 +63,10 @@ SECTIONS __bss_start = .; .bss (NOLOAD) : { *(.bss) . = ALIGN(4); } _end = .; + + /DISCARD/ : { *(.dynstr*) } + /DISCARD/ : { *(.dynamic*) } + /DISCARD/ : { *(.plt*) } + /DISCARD/ : { *(.interp*) } + /DISCARD/ : { *(.gnu*) } } |