7 * See file CREDITS for list of people who contributed to this
10 * This program is free software; you can redistribute it and/or
11 * modify it under the terms of the GNU General Public License as
12 * published by the Free Software Foundation; either version 2 of
13 * the License, or (at your option) any later version.
15 * This program is distributed in the hope that it will be useful,
16 * but WITHOUT ANY WARRANTY; without even the implied warranty of
17 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
18 * GNU General Public License for more details.
20 * You should have received a copy of the GNU General Public License
21 * along with this program; if not, write to the Free Software
22 * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
28 #include <asm/arch/hardware.h>
29 #include <asm/arch/at91_pmc.h>
30 #include <asm/arch/at91_pit.h>
31 #include <asm/arch/at91_gpbr.h>
32 #include <asm/arch/clk.h>
34 #ifndef CONFIG_SYS_AT91_MAIN_CLOCK
35 #define CONFIG_SYS_AT91_MAIN_CLOCK 0
38 int arch_cpu_init(void)
40 return at91_clock_init(CONFIG_SYS_AT91_MAIN_CLOCK);
43 void arch_preboot_os(void)
46 at91_pit_t *pit = (at91_pit_t *) ATMEL_BASE_PIT;
48 cpiv = AT91_PIT_MR_PIV_MASK(readl(&pit->piir));
52 * Add 0x1000 to current counter to stop it faster
53 * without waiting for wrapping back to 0
55 writel(cpiv + 0x1000, &pit->mr);
58 #if defined(CONFIG_DISPLAY_CPUINFO)
59 int print_cpuinfo(void)
63 printf("CPU: %s\n", ATMEL_CPU_NAME);
64 printf("Crystal frequency: %8s MHz\n",
65 strmhz(buf, get_main_clk_rate()));
66 printf("CPU clock : %8s MHz\n",
67 strmhz(buf, get_cpu_clk_rate()));
68 printf("Master clock : %8s MHz\n",
69 strmhz(buf, get_mck_clk_rate()));
75 #ifdef CONFIG_BOOTCOUNT_LIMIT
77 * We combine the BOOTCOUNT_MAGIC and bootcount in one 32-bit register.
78 * This is done so we need to use only one of the four GPBR registers.
80 void bootcount_store (ulong a)
82 at91_gpbr_t *gpbr = (at91_gpbr_t *) ATMEL_BASE_GPBR;
84 writel((BOOTCOUNT_MAGIC & 0xffff0000) | (a & 0x0000ffff),
85 &gpbr->reg[AT91_GPBR_INDEX_BOOTCOUNT]);
88 ulong bootcount_load (void)
90 at91_gpbr_t *gpbr = (at91_gpbr_t *) ATMEL_BASE_GPBR;
92 ulong val = readl(&gpbr->reg[AT91_GPBR_INDEX_BOOTCOUNT]);
93 if ((val & 0xffff0000) != (BOOTCOUNT_MAGIC & 0xffff0000))
96 return val & 0x0000ffff;
99 #endif /* CONFIG_BOOTCOUNT_LIMIT */