1 // SPDX-License-Identifier: GPL-2.0+
4 * Reinhard Meyer, reinhard.meyer@emk-elektronik.de
6 * Jean-Christophe PLAGNIOL-VILLARD <plagnioj@jcrosoft.com>
8 * Bo Shen <voice.shen@atmel.com>
15 #include <asm/arch/hardware.h>
16 #include <asm/arch/at91_pit.h>
17 #include <asm/arch/at91_gpbr.h>
18 #include <asm/arch/clk.h>
20 #ifndef CONFIG_SYS_AT91_MAIN_CLOCK
21 #define CONFIG_SYS_AT91_MAIN_CLOCK 0
24 int arch_cpu_init(void)
26 return at91_clock_init(CONFIG_SYS_AT91_MAIN_CLOCK);
29 void arch_preboot_os(void)
32 at91_pit_t *pit = (at91_pit_t *)ATMEL_BASE_PIT;
34 cpiv = AT91_PIT_MR_PIV_MASK(readl(&pit->piir));
38 * Add 0x1000 to current counter to stop it faster
39 * without waiting for wrapping back to 0
41 writel(cpiv + 0x1000, &pit->mr);
44 #if defined(CONFIG_DISPLAY_CPUINFO)
45 int print_cpuinfo(void)
49 printf("CPU: %s\n", get_cpu_name());
50 printf("Crystal frequency: %8s MHz\n",
51 strmhz(buf, get_main_clk_rate()));
52 printf("CPU clock : %8s MHz\n",
53 strmhz(buf, get_cpu_clk_rate()));
54 printf("Master clock : %8s MHz\n",
55 strmhz(buf, get_mck_clk_rate()));
61 void enable_caches(void)
67 #define ATMEL_CHIPID_CIDR_VERSION 0x1f
69 unsigned int get_chip_id(void)
71 return readl(ATMEL_CHIPID_CIDR) & ~ATMEL_CHIPID_CIDR_VERSION;
74 unsigned int get_extension_chip_id(void)
76 return readl(ATMEL_CHIPID_EXID);