1 /* 2 * (C) Copyright 2010 3 * Reinhard Meyer, reinhard.meyer@emk-elektronik.de 4 * (C) Copyright 2009 5 * Jean-Christophe PLAGNIOL-VILLARD <plagnioj@jcrosoft.com> 6 * (C) Copyright 2013 7 * Bo Shen <voice.shen@atmel.com> 8 * 9 * SPDX-License-Identifier: GPL-2.0+ 10 */ 11 12 #include <common.h> 13 #include <asm/io.h> 14 #include <asm/arch/hardware.h> 15 #include <asm/arch/at91_dbu.h> 16 #include <asm/arch/at91_pmc.h> 17 #include <asm/arch/at91_pit.h> 18 #include <asm/arch/at91_gpbr.h> 19 #include <asm/arch/clk.h> 20 21 #ifndef CONFIG_SYS_AT91_MAIN_CLOCK 22 #define CONFIG_SYS_AT91_MAIN_CLOCK 0 23 #endif 24 25 int arch_cpu_init(void) 26 { 27 return at91_clock_init(CONFIG_SYS_AT91_MAIN_CLOCK); 28 } 29 30 void arch_preboot_os(void) 31 { 32 ulong cpiv; 33 at91_pit_t *pit = (at91_pit_t *)ATMEL_BASE_PIT; 34 35 cpiv = AT91_PIT_MR_PIV_MASK(readl(&pit->piir)); 36 37 /* 38 * Disable PITC 39 * Add 0x1000 to current counter to stop it faster 40 * without waiting for wrapping back to 0 41 */ 42 writel(cpiv + 0x1000, &pit->mr); 43 } 44 45 #if defined(CONFIG_DISPLAY_CPUINFO) 46 int print_cpuinfo(void) 47 { 48 char buf[32]; 49 50 printf("CPU: %s\n", get_cpu_name()); 51 printf("Crystal frequency: %8s MHz\n", 52 strmhz(buf, get_main_clk_rate())); 53 printf("CPU clock : %8s MHz\n", 54 strmhz(buf, get_cpu_clk_rate())); 55 printf("Master clock : %8s MHz\n", 56 strmhz(buf, get_mck_clk_rate())); 57 58 return 0; 59 } 60 #endif 61 62 void enable_caches(void) 63 { 64 icache_enable(); 65 dcache_enable(); 66 } 67 68 unsigned int get_chip_id(void) 69 { 70 return readl(ATMEL_BASE_DBGU + AT91_DBU_CIDR) & ~AT91_DBU_CIDR_MASK; 71 } 72 73 unsigned int get_extension_chip_id(void) 74 { 75 return readl(ATMEL_BASE_DBGU + AT91_DBU_EXID); 76 } 77