/* * File : board.c * This file is part of RT-Thread RTOS * COPYRIGHT (C) 2006 - 2009 RT-Thread Develop Team * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License as published by * the Free Software Foundation; either version 2 of the License, or * (at your option) any later version. * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. * * You should have received a copy of the GNU General Public License along * with this program; if not, write to the Free Software Foundation, Inc., * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. * * Change Logs: * Date Author Notes * 2011-01-13 weety first version */ #include #include #include "board.h" #include /** * @addtogroup at91sam9260 */ /*@{*/ #if defined(__CC_ARM) extern int Image$$ER_ZI$$ZI$$Limit; #define HEAP_BEGIN (&Image$$ER_ZI$$ZI$$Limit) #elif (defined (__GNUC__)) extern unsigned char __bss_end__; #define HEAP_BEGIN (&__bss_end__) #elif (defined (__ICCARM__)) #pragma section=".noinit" #define HEAP_BEGIN (__section_end(".noinit")) #endif #define HEAP_END (0x24000000) extern void rt_hw_interrupt_init(void); extern void rt_hw_clock_init(void); extern void rt_hw_get_clock(void); extern void rt_hw_set_dividor(rt_uint8_t hdivn, rt_uint8_t pdivn); extern void rt_hw_set_clock(rt_uint8_t sdiv, rt_uint8_t pdiv, rt_uint8_t mdiv); extern void rt_dbgu_isr(void); static struct mem_desc at91_mem_desc[] = { { 0x00000000, 0xFFFFFFFF, 0x00000000, RW_NCNB }, /* None cached for 4G memory */ { 0x20000000, 0x24000000-1, 0x20000000, RW_CB }, /* 64M cached SDRAM memory */ { 0x00000000, 0x100000, 0x20000000, RW_CB }, /* isr vector table */ { 0x90000000, 0x90400000 - 1, 0x00200000, RW_NCNB }, /* 4K SRAM0 + 4k SRAM1 */ { 0xA0000000, 0xA4000000-1, 0x20000000, RW_NCNB } /* 64M none-cached SDRAM memory */ }; #define PIT_CPIV(x) ((x) & AT91_PIT_CPIV) #define PIT_PICNT(x) (((x) & AT91_PIT_PICNT) >> 20) static rt_uint32_t pit_cycle; /* write-once */ static rt_uint32_t pit_cnt; /* access only w/system irq blocked */ /** * This function will handle rtos timer */ void rt_timer_handler(int vector, void *param) { #ifdef RT_USING_DBGU if (at91_sys_read(AT91_DBGU + AT91_US_CSR) & 0x1) { rt_dbgu_isr(); } #endif if (at91_sys_read(AT91_PIT_SR) & AT91_PIT_PITS) { unsigned nr_ticks; /* Get number of ticks performed before irq, and ack it */ nr_ticks = PIT_PICNT(at91_sys_read(AT91_PIT_PIVR)); rt_tick_increase(); } } static void at91sam926x_pit_reset(void) { /* Disable timer and irqs */ at91_sys_write(AT91_PIT_MR, 0); /* Clear any pending interrupts, wait for PIT to stop counting */ while (PIT_CPIV(at91_sys_read(AT91_PIT_PIVR)) != 0) ; /* Start PIT but don't enable IRQ */ //at91_sys_write(AT91_PIT_MR, (pit_cycle - 1) | AT91_PIT_PITEN); pit_cnt += pit_cycle * PIT_PICNT(at91_sys_read(AT91_PIT_PIVR)); at91_sys_write(AT91_PIT_MR, (pit_cycle - 1) | AT91_PIT_PITEN | AT91_PIT_PITIEN); rt_kprintf("PIT_MR=0x%08x\n", at91_sys_read(AT91_PIT_MR)); } /* * Set up both clocksource and clockevent support. */ static void at91sam926x_pit_init(void) { rt_uint32_t pit_rate; rt_uint32_t bits; /* * Use our actual MCK to figure out how many MCK/16 ticks per * 1/HZ period (instead of a compile-time constant LATCH). */ pit_rate = clk_get_rate(clk_get("mck")) / 16; rt_kprintf("pit_rate=%dHZ\n", pit_rate); pit_cycle = (pit_rate + RT_TICK_PER_SECOND/2) / RT_TICK_PER_SECOND; /* Initialize and enable the timer */ at91sam926x_pit_reset(); } /** * This function will init pit for system ticks */ void rt_hw_timer_init() { at91sam926x_pit_init(); /* install interrupt handler */ rt_hw_interrupt_install(AT91_ID_SYS, rt_timer_handler, RT_NULL, "system"); rt_hw_interrupt_umask(AT91_ID_SYS); } void at91_tc1_init() { at91_sys_write(AT91_PMC_PCER, 1<CSR & TXRDY)); DBGU->THR = c; } /** * This function is used to display a string on console, normally, it's * invoked by rt_kprintf * * @param str the displayed string */ void rt_hw_console_output(const char* str) { while (*str) { if (*str=='\n') { at91_usart_putc('\r'); } at91_usart_putc(*str++); } } static void rt_hw_console_init(void) { int div; int mode = 0; DBGU->CR = AT91_US_RSTTX | AT91_US_RSTRX | AT91_US_RXDIS | AT91_US_TXDIS; mode |= AT91_US_USMODE_NORMAL | AT91_US_USCLKS_MCK | AT91_US_CHMODE_NORMAL; mode |= AT91_US_CHRL_8; mode |= AT91_US_NBSTOP_1; mode |= AT91_US_PAR_NONE; DBGU->MR = mode; div = (clk_get_rate(clk_get("mck")) / 16 + BPS/2) / BPS; DBGU->BRGR = div; DBGU->CR = AT91_US_RXEN | AT91_US_TXEN; } /** * This function will init at91sam9260 board */ void rt_hw_board_init() { /* initialize the system clock */ rt_hw_clock_init(); /* initialize console */ rt_hw_console_init(); /* initialize mmu */ rt_hw_mmu_init(at91_mem_desc, sizeof(at91_mem_desc)/sizeof(at91_mem_desc[0])); /* initialize hardware interrupt */ rt_hw_interrupt_init(); /* initialize early device */ #ifdef RT_USING_COMPONENTS_INIT rt_components_board_init(); #endif #ifdef RT_USING_CONSOLE rt_console_set_device(RT_CONSOLE_DEVICE_NAME); #endif /* initialize timer0 */ rt_hw_timer_init(); /* initialize board */ #ifdef RT_USING_HEAP rt_system_heap_init((void *)HEAP_BEGIN, (void *)HEAP_END); #endif } /*@}*/