3 * Reinhard Meyer, reinhard.meyer@emk-elektronik.de
5 * Jean-Christophe PLAGNIOL-VILLARD <plagnioj@jcrosoft.com>
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>
33 #include <asm/arch/io.h>
35 #ifndef CONFIG_SYS_AT91_MAIN_CLOCK
36 #define CONFIG_SYS_AT91_MAIN_CLOCK 0
39 int arch_cpu_init(void)
41 return at91_clock_init(CONFIG_SYS_AT91_MAIN_CLOCK);
44 void arch_preboot_os(void)
47 at91_pit_t *pit = (at91_pit_t *) ATMEL_BASE_PIT;
49 cpiv = AT91_PIT_MR_PIV_MASK(readl(&pit->piir));
53 * Add 0x1000 to current counter to stop it faster
54 * without waiting for wrapping back to 0
56 writel(cpiv + 0x1000, &pit->mr);
59 #if defined(CONFIG_DISPLAY_CPUINFO)
60 int print_cpuinfo(void)
64 printf("CPU: %s\n", ATMEL_CPU_NAME);
65 printf("Crystal frequency: %8s MHz\n",
66 strmhz(buf, get_main_clk_rate()));
67 printf("CPU clock : %8s MHz\n",
68 strmhz(buf, get_cpu_clk_rate()));
69 printf("Master clock : %8s MHz\n",
70 strmhz(buf, get_mck_clk_rate()));
76 #ifdef CONFIG_BOOTCOUNT_LIMIT
78 * We combine the BOOTCOUNT_MAGIC and bootcount in one 32-bit register.
79 * This is done so we need to use only one of the four GPBR registers.
81 void bootcount_store (ulong a)
83 at91_gpbr_t *gpbr = (at91_gpbr_t *) ATMEL_BASE_GPBR;
85 writel((BOOTCOUNT_MAGIC & 0xffff0000) | (a & 0x0000ffff),
86 &gpbr->reg[AT91_GPBR_INDEX_BOOTCOUNT]);
89 ulong bootcount_load (void)
91 at91_gpbr_t *gpbr = (at91_gpbr_t *) ATMEL_BASE_GPBR;
93 ulong val = readl(&gpbr->reg[AT91_GPBR_INDEX_BOOTCOUNT]);
94 if ((val & 0xffff0000) != (BOOTCOUNT_MAGIC & 0xffff0000))
97 return val & 0x0000ffff;
100 #endif /* CONFIG_BOOTCOUNT_LIMIT */