diff options
Diffstat (limited to 'arch/arm/cpu')
| -rw-r--r-- | arch/arm/cpu/Makefile | 1 | ||||
| -rw-r--r-- | arch/arm/cpu/cpuinfo.c | 137 |
2 files changed, 138 insertions, 0 deletions
diff --git a/arch/arm/cpu/Makefile b/arch/arm/cpu/Makefile index 2cbed3db1c..02c26f41ef 100644 --- a/arch/arm/cpu/Makefile +++ b/arch/arm/cpu/Makefile @@ -8,3 +8,4 @@ obj-$(CONFIG_ARM920T) += start-arm.o obj-$(CONFIG_ARM926EJS) += start-arm.o obj-$(CONFIG_ARMCORTEXA8) += start-arm.o obj-$(CONFIG_ARCH_IMX31) += start-arm.o +obj-$(CONFIG_CMD_ARM_CPUINFO) += cpuinfo.o diff --git a/arch/arm/cpu/cpuinfo.c b/arch/arm/cpu/cpuinfo.c new file mode 100644 index 0000000000..632cffa446 --- /dev/null +++ b/arch/arm/cpu/cpuinfo.c @@ -0,0 +1,137 @@ +/* + * cpuinfo.c - Show information about cp15 registers + * + * Copyright (c) 2009 Sascha Hauer <s.hauer@pengutronix.de>, Pengutronix + * + * See file CREDITS for list of people who contributed to this + * project. + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License version 2 + * as published by the Free Software Foundation. + * + * 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., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA + */ + +#include <common.h> +#include <command.h> + +static void decode_cache(unsigned long size) +{ + int linelen = 1 << ((size & 0x3) + 3); + int mult = 2 + ((size >> 2) & 1); + int cache_size = mult << (((size >> 6) & 0x7) + 8); + + if (((size >> 2) & 0xf) == 1) + printf("no cache\n"); + else + printf("%d bytes (linelen = %d)\n", cache_size, linelen); +} + +static char *post_arm7_archs[] = {"v4", "v4T", "v5", "v5T", "v5TE", "v5TEJ", "v6"}; + +static char *crbits[] = {"M", "A", "C", "W", "P", "D", "L", "B", "S", "R", + "F", "Z", "I", "V", "RR", "L4", "", "", "", "", "", "FI", "U", "XP", + "VE", "EE", "L2"}; + +static int do_cpuinfo(cmd_tbl_t *cmdtp, int argc, char *argv[]) +{ + unsigned long mainid, cache, cr; + char *architecture, *implementer; + int i; + + __asm__ __volatile__( + "mrc p15, 0, %0, c0, c0, 0 @ read control reg\n" + : "=r" (mainid) + : + : "memory"); + + __asm__ __volatile__( + "mrc p15, 0, %0, c0, c0, 1 @ read control reg\n" + : "=r" (cache) + : + : "memory"); + + __asm__ __volatile__( + "mrc p15, 0, %0, c1, c0, 0 @ read control reg\n" + : "=r" (cr) + : + : "memory"); + + switch (mainid >> 24) { + case 0x41: + implementer = "ARM"; + break; + case 0x44: + implementer = "Digital Equipment Corp."; + break; + case 0x40: + implementer = "Motorola - Freescale Semiconductor Inc."; + break; + case 0x56: + implementer = "Marvell Semiconductor Inc."; + break; + case 0x69: + implementer = "Intel Corp."; + break; + default: + implementer = "Unknown"; + } + + if ((mainid & 0x0008f000) == 0x00000000) { + /* pre-ARM7 */ + architecture = "Pre-ARM7"; + } else { + if ((mainid & 0x0008f000) == 0x00007000) { + /* ARM7 */ + if (mainid & (1 << 23)) + architecture = "3"; + else + architecture = "4T"; + } else { + /* post-ARM7 */ + int arch = (mainid >> 16) & 0xf; + if (arch > 0 && arch < 8) + architecture = post_arm7_archs[arch - 1]; + else + architecture = "Unknown"; + } + } + + printf("implementer: %s\narchitecture: %s\n", + implementer, architecture); + + if (cache & (1 << 24)) { + /* seperate I/D cache */ + printf("I-cache: "); + decode_cache(cache & 0xfff); + printf("D-cache: "); + decode_cache((cache >> 12) & 0xfff); + } else { + /* unified I/D cache */ + printf("cache: "); + decode_cache(cache & 0xfff); + } + + printf("Control register: "); + for (i = 0; i < 27; i++) + if (cr & (1 << i)) + printf("%s ", crbits[i]); + printf("\n"); + + return 0; +} + +U_BOOT_CMD_START(cpuinfo) + .maxargs = CONFIG_MAXARGS, + .cmd = do_cpuinfo, + .usage = "Show info about CPU", +U_BOOT_CMD_END + |