diff options
Diffstat (limited to 'arch/arm/cpu')
| -rw-r--r-- | arch/arm/cpu/arm926ejs/at91/cpu.c | 48 |
1 files changed, 28 insertions, 20 deletions
diff --git a/arch/arm/cpu/arm926ejs/at91/cpu.c b/arch/arm/cpu/arm926ejs/at91/cpu.c index 141a7d1ec..5e30f1dcc 100644 --- a/arch/arm/cpu/arm926ejs/at91/cpu.c +++ b/arch/arm/cpu/arm926ejs/at91/cpu.c @@ -1,4 +1,6 @@ /* + * (C) Copyright 2010 + * Reinhard Meyer, reinhard.meyer@emk-elektronik.de * (C) Copyright 2009 * Jean-Christophe PLAGNIOL-VILLARD <plagnioj@jcrosoft.com> * @@ -22,12 +24,11 @@ */ #include <common.h> -#ifdef CONFIG_AT91_LEGACY -#warning Your board is using legacy SoC access. Please update! -#endif #include <asm/arch/hardware.h> #include <asm/arch/at91_pmc.h> +#include <asm/arch/at91_pit.h> +#include <asm/arch/at91_gpbr.h> #include <asm/arch/clk.h> #include <asm/arch/io.h> @@ -35,18 +36,26 @@ #define CONFIG_SYS_AT91_MAIN_CLOCK 0 #endif -/* - * The at91sam9260 has 4 GPBR (0-3), we'll use the last one, nr 3, - * to keep track of the bootcount. - */ -#define AT91_GPBR_BOOTCOUNT_REGISTER 3 -#define AT91_BOOTCOUNT_ADDRESS (AT91_GPBR + 4*AT91_GPBR_BOOTCOUNT_REGISTER) - int arch_cpu_init(void) { return at91_clock_init(CONFIG_SYS_AT91_MAIN_CLOCK); } +void arch_preboot_os(void) +{ + ulong cpiv; + at91_pit_t *pit = (at91_pit_t *) AT91_PIT_BASE; + + cpiv = AT91_PIT_MR_PIV_MASK(readl(&pit->piir)); + + /* + * Disable PITC + * Add 0x1000 to current counter to stop it faster + * without waiting for wrapping back to 0 + */ + writel(cpiv + 0x1000, &pit->mr); +} + #if defined(CONFIG_DISPLAY_CPUINFO) int print_cpuinfo(void) { @@ -66,27 +75,26 @@ int print_cpuinfo(void) #ifdef CONFIG_BOOTCOUNT_LIMIT /* - * Just as the mpc5xxx, we combine the BOOTCOUNT_MAGIC and boocount - * in one 32-bit register. This is done, as the AT91SAM9260 only has - * 4 GPBR. + * We combine the BOOTCOUNT_MAGIC and bootcount in one 32-bit register. + * This is done so we need to use only one of the four GPBR registers. */ void bootcount_store (ulong a) { - volatile ulong *save_addr = - (volatile ulong *)(AT91_BASE_SYS + AT91_BOOTCOUNT_ADDRESS); + at91_gpbr_t *gpbr = (at91_gpbr_t *) AT91_GPR_BASE; - *save_addr = (BOOTCOUNT_MAGIC & 0xffff0000) | (a & 0x0000ffff); + writel((BOOTCOUNT_MAGIC & 0xffff0000) | (a & 0x0000ffff), + &gpbr->reg[AT91_GPBR_INDEX_BOOTCOUNT]); } ulong bootcount_load (void) { - volatile ulong *save_addr = - (volatile ulong *)(AT91_BASE_SYS + AT91_BOOTCOUNT_ADDRESS); + at91_gpbr_t *gpbr = (at91_gpbr_t *) AT91_GPR_BASE; - if ((*save_addr & 0xffff0000) != (BOOTCOUNT_MAGIC & 0xffff0000)) + ulong val = readl(&gpbr->reg[AT91_GPBR_INDEX_BOOTCOUNT]); + if ((val & 0xffff0000) != (BOOTCOUNT_MAGIC & 0xffff0000)) return 0; else - return (*save_addr & 0x0000ffff); + return val & 0x0000ffff; } #endif /* CONFIG_BOOTCOUNT_LIMIT */ |