diff options
| -rw-r--r-- | arch/arm/cpu/pxa/cpu.c | 229 | ||||
| -rw-r--r-- | arch/arm/cpu/pxa/start.S | 344 |
2 files changed, 359 insertions, 214 deletions
diff --git a/arch/arm/cpu/pxa/cpu.c b/arch/arm/cpu/pxa/cpu.c index 330d013..3ea3458 100644 --- a/arch/arm/cpu/pxa/cpu.c +++ b/arch/arm/cpu/pxa/cpu.c @@ -30,11 +30,11 @@ * CPU specific code */ -#include <asm/arch/pxa-regs.h> #include <asm/io.h> #include <asm/system.h> #include <command.h> #include <common.h> +#include <asm/arch/pxa-regs.h> static void cache_flush(void); @@ -91,3 +91,230 @@ void set_GPIO_mode(int gpio_mode) writel(val, GAFR(gpio)); } #endif /* CONFIG_CPU_MONAHANS */ + +void pxa_wait_ticks(int ticks) +{ + writel(0, OSCR); + while (readl(OSCR) < ticks) + asm volatile("":::"memory"); +} + +inline void writelrb(uint32_t val, uint32_t addr) +{ + writel(val, addr); + asm volatile("":::"memory"); + readl(addr); + asm volatile("":::"memory"); +} + +void pxa_dram_init(void) +{ + uint32_t tmp; + int i; + /* + * 1) Initialize Asynchronous static memory controller + */ + + writelrb(CONFIG_SYS_MSC0_VAL, MSC0); + writelrb(CONFIG_SYS_MSC1_VAL, MSC1); + writelrb(CONFIG_SYS_MSC2_VAL, MSC2); + /* + * 2) Initialize Card Interface + */ + + /* MECR: Memory Expansion Card Register */ + writelrb(CONFIG_SYS_MECR_VAL, MECR); + /* MCMEM0: Card Interface slot 0 timing */ + writelrb(CONFIG_SYS_MCMEM0_VAL, MCMEM0); + /* MCMEM1: Card Interface slot 1 timing */ + writelrb(CONFIG_SYS_MCMEM1_VAL, MCMEM1); + /* MCATT0: Card Interface Attribute Space Timing, slot 0 */ + writelrb(CONFIG_SYS_MCATT0_VAL, MCATT0); + /* MCATT1: Card Interface Attribute Space Timing, slot 1 */ + writelrb(CONFIG_SYS_MCATT1_VAL, MCATT1); + /* MCIO0: Card Interface I/O Space Timing, slot 0 */ + writelrb(CONFIG_SYS_MCIO0_VAL, MCIO0); + /* MCIO1: Card Interface I/O Space Timing, slot 1 */ + writelrb(CONFIG_SYS_MCIO1_VAL, MCIO1); + + /* + * 3) Configure Fly-By DMA register + */ + + writelrb(CONFIG_SYS_FLYCNFG_VAL, FLYCNFG); + + /* + * 4) Initialize Timing for Sync Memory (SDCLK0) + */ + + /* + * Before accessing MDREFR we need a valid DRI field, so we set + * this to power on defaults + DRI field. + */ + + /* Read current MDREFR config and zero out DRI */ + tmp = readl(MDREFR) & ~0xfff; + /* Add user-specified DRI */ + tmp |= CONFIG_SYS_MDREFR_VAL & 0xfff; + /* Configure important bits */ + tmp |= MDREFR_K0RUN | MDREFR_SLFRSH; + tmp &= ~(MDREFR_APD | MDREFR_E1PIN); + + /* Write MDREFR back */ + writelrb(tmp, MDREFR); + + /* + * 5) Initialize Synchronous Static Memory (Flash/Peripherals) + */ + + /* Initialize SXCNFG register. Assert the enable bits. + * + * Write SXMRS to cause an MRS command to all enabled banks of + * synchronous static memory. Note that SXLCR need not be written + * at this time. + */ + writelrb(CONFIG_SYS_SXCNFG_VAL, SXCNFG); + + /* + * 6) Initialize SDRAM + */ + + writelrb(CONFIG_SYS_MDREFR_VAL & ~MDREFR_SLFRSH, MDREFR); + writelrb(CONFIG_SYS_MDREFR_VAL | MDREFR_E1PIN, MDREFR); + + /* + * 7) Write MDCNFG with MDCNFG:DEx deasserted (set to 0), to configure + * but not enable each SDRAM partition pair. + */ + + writelrb(CONFIG_SYS_MDCNFG_VAL & + ~(MDCNFG_DE0 | MDCNFG_DE1 | MDCNFG_DE2 | MDCNFG_DE3), MDCNFG); + /* Wait for the clock to the SDRAMs to stabilize, 100..200 usec. */ + pxa_wait_ticks(0x300); + + /* + * 8) Trigger a number (usually 8) refresh cycles by attempting + * non-burst read or write accesses to disabled SDRAM, as commonly + * specified in the power up sequence documented in SDRAM data + * sheets. The address(es) used for this purpose must not be + * cacheable. + */ + for (i = 9; i >= 0; i--) { + writel(i, 0xa0000000); + asm volatile("":::"memory"); + } + /* + * 9) Write MDCNFG with enable bits asserted (MDCNFG:DEx set to 1). + */ + + tmp = CONFIG_SYS_MDCNFG_VAL & + (MDCNFG_DE0 | MDCNFG_DE1 | MDCNFG_DE2 | MDCNFG_DE3); + tmp |= readl(MDCNFG); + writelrb(tmp, MDCNFG); + + /* + * 10) Write MDMRS. + */ + + writelrb(CONFIG_SYS_MDMRS_VAL, MDMRS); + + /* + * 11) Enable APD + */ + + if (CONFIG_SYS_MDREFR_VAL & MDREFR_APD) { + tmp = readl(MDREFR); + tmp |= MDREFR_APD; + writelrb(tmp, MDREFR); + } +} + +void pxa_gpio_setup(void) +{ + writel(CONFIG_SYS_GPSR0_VAL, GPSR0); + writel(CONFIG_SYS_GPSR1_VAL, GPSR1); + writel(CONFIG_SYS_GPSR2_VAL, GPSR2); +#if defined(CONFIG_PXA27X) || defined(CONFIG_CPU_MONAHANS) + writel(CONFIG_SYS_GPSR3_VAL, GPSR3); +#endif + + writel(CONFIG_SYS_GPCR0_VAL, GPCR0); + writel(CONFIG_SYS_GPCR1_VAL, GPCR1); + writel(CONFIG_SYS_GPCR2_VAL, GPCR2); +#if defined(CONFIG_PXA27X) || defined(CONFIG_CPU_MONAHANS) + writel(CONFIG_SYS_GPCR3_VAL, GPCR3); +#endif + + writel(CONFIG_SYS_GPDR0_VAL, GPDR0); + writel(CONFIG_SYS_GPDR1_VAL, GPDR1); + writel(CONFIG_SYS_GPDR2_VAL, GPDR2); +#if defined(CONFIG_PXA27X) || defined(CONFIG_CPU_MONAHANS) + writel(CONFIG_SYS_GPDR3_VAL, GPDR3); +#endif + + writel(CONFIG_SYS_GAFR0_L_VAL, GAFR0_L); + writel(CONFIG_SYS_GAFR0_U_VAL, GAFR0_U); + writel(CONFIG_SYS_GAFR1_L_VAL, GAFR1_L); + writel(CONFIG_SYS_GAFR1_U_VAL, GAFR1_U); + writel(CONFIG_SYS_GAFR2_L_VAL, GAFR2_L); + writel(CONFIG_SYS_GAFR2_U_VAL, GAFR2_U); +#if defined(CONFIG_PXA27X) || defined(CONFIG_CPU_MONAHANS) + writel(CONFIG_SYS_GAFR3_L_VAL, GAFR3_L); + writel(CONFIG_SYS_GAFR3_U_VAL, GAFR3_U); +#endif + + writel(CONFIG_SYS_PSSR_VAL, PSSR); +} + +void pxa_interrupt_setup(void) +{ + writel(0, ICLR); + writel(0, ICMR); +#if defined(CONFIG_PXA27X) || defined(CONFIG_CPU_MONAHANS) + writel(0, ICLR2); + writel(0, ICMR2); +#endif +} + +void pxa_clock_setup(void) +{ +#ifndef CONFIG_CPU_MONAHANS + writel(CONFIG_SYS_CKEN, CKEN); + writel(CONFIG_SYS_CCCR, CCCR); + asm volatile("mcr p14, 0, %0, c6, c0, 0"::"r"(2)); +#else +/* Set CKENA/CKENB/ACCR for MH */ +#endif + + /* enable the 32Khz oscillator for RTC and PowerManager */ + writel(OSCC_OON, OSCC); + while(!(readl(OSCC) & OSCC_OOK)) + asm volatile("":::"memory"); +} + +void pxa_wakeup(void) +{ + uint32_t rcsr; + + rcsr = readl(RCSR); + writel(rcsr & (RCSR_GPR | RCSR_SMR | RCSR_WDR | RCSR_HWR), RCSR); + + /* Wakeup */ + if (rcsr & RCSR_SMR) { + writel(PSSR_PH, PSSR); + pxa_dram_init(); + icache_disable(); + dcache_disable(); + asm volatile("mov pc, %0"::"r"(readl(PSSR))); + } +} + +int arch_cpu_init(void) +{ + pxa_gpio_setup(); +// pxa_wait_ticks(0x8000); + pxa_wakeup(); + pxa_interrupt_setup(); + pxa_clock_setup(); + return 0; +} diff --git a/arch/arm/cpu/pxa/start.S b/arch/arm/cpu/pxa/start.S index 9c5023b..684e44e 100644 --- a/arch/arm/cpu/pxa/start.S +++ b/arch/arm/cpu/pxa/start.S @@ -31,6 +31,14 @@ #include <config.h> #include <version.h> #include <asm/arch/pxa-regs.h> +#include <asm/arch/macro.h> + +/* 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 @@ -86,11 +94,9 @@ _fiq: .word 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. @@ -115,7 +121,7 @@ FIQ_STACK_START: .word 0x0badc0de #endif /* CONFIG_USE_IRQ */ -#if !defined(CONFIG_SYS_ARM_WITHOUT_RELOC) +#ifndef CONFIG_PRELOADER /* IRQ stack memory (calculated at run-time) + 8 bytes */ .globl IRQ_STACK_START_IN IRQ_STACK_START_IN: @@ -159,12 +165,84 @@ reset: 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 -#endif + /* 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: @@ -201,11 +279,13 @@ stack_setup: beq clear_bss #ifndef CONFIG_SKIP_RELOCATE_UBOOT + stmfd sp!, {r0-r12} copy_loop: - ldmia r0!, {r9-r10} /* copy from source address [r0] */ - stmia r6!, {r9-r10} /* copy to target address [r1] */ + ldmia r0!, {r3-r5, r7-r11} /* copy from source address [r0] */ + stmia r6!, {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 got entries */ @@ -274,218 +354,28 @@ _board_init_r: .word board_init_r /****************************************************************************/ /* */ -/* the actual reset code */ +/* the actual reset code for OneNAND IPL */ /* */ /****************************************************************************/ +#ifndef CONFIG_PXA27X +#error OneNAND IPL is not supported on PXA25x and 26x due to lack of SRAM +#endif + reset: - mrs r0,cpsr /* set the CPU to SVC32 mode */ - bic r0,r0,#0x1f /* (superviser mode, M=10011) */ + /* Set CPU to SVC32 mode */ + mrs r0,cpsr + bic r0,r0,#0x1f orr r0,r0,#0x13 msr cpsr,r0 - /* - * we do sys-critical inits only at reboot, - * not when booting from RAM! - */ -#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 */ -#ifndef CONFIG_PRELOADER - cmp r0, r1 /* don't reloc during debug */ - beq stack_setup -#endif - - ldr r2, _armboot_start - ldr r3, _bss_start - sub r2, r3, r2 /* r2 <- size of armboot */ - add r2, r0, r2 /* r2 <- source end address */ - -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] */ - blo copy_loop -#endif /* !CONFIG_SKIP_RELOCATE_UBOOT */ + /* Point stack at the end of SRAM and leave 32 words for abort-stack */ + ldr sp, =0x5c03ff80 - /* Set up the stack */ -stack_setup: - ldr r0, _TEXT_BASE /* upper 128 KiB: relocated uboot */ -#ifdef CONFIG_PRELOADER - sub sp, r0, #128 /* leave 32 words for abort-stack */ -#else - 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 sp, r0, #12 /* leave 3 words for abort-stack */ - bic sp, sp, #7 /* 8-byte alignment for ABI compliance */ -#endif + /* Start OneNAND IPL */ + ldr pc, =start_oneboot -clear_bss: - ldr r0, _bss_start /* find start of bss segment */ - ldr r1, _bss_end /* stop here */ - mov r2, #0x00000000 /* clear */ - -#ifndef CONFIG_PRELOADER -clbss_l:str r2, [r0] /* clear loop... */ - add r0, r0, #4 - cmp r0, r1 - blo clbss_l -#endif - - ldr pc, _start_armboot - -#ifdef CONFIG_ONENAND_IPL -_start_armboot: .word start_oneboot -#else -_start_armboot: .word start_armboot -#endif -#endif /* #if !defined(CONFIG_SYS_ARM_WITHOUT_RELOC) */ - -/****************************************************************************/ -/* */ -/* CPU_init_critical registers */ -/* */ -/* - setup important registers */ -/* - setup memory timing */ -/* */ -/****************************************************************************/ -/* 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 - - mcr p15, 0, r0, c7, c7, 0 /* flush Icache, Dcache and BTB */ - CPWAIT r0 - - mcr p15, 0, r0, c8, c7, 0 /* flush instuction and data TLBs */ - CPWAIT r0 - - /* 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 +#endif /* #if !defined(CONFIG_ONENAND_IPL) */ #ifndef CONFIG_PRELOADER /****************************************************************************/ @@ -676,6 +566,12 @@ fiq: /* perform a watchdog timeout for a soft reset. */ /* */ /****************************************************************************/ +/* Operating System Timer */ +OSTIMER_BASE: .word 0x40a00000 +#define OSMR3 0x0C +#define OSCR 0x10 +#define OWER 0x18 +#define OIER 0x1C .align 5 .globl reset_cpu @@ -703,3 +599,25 @@ reset_cpu: 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 |