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author | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-27 10:05:51 +0000 |
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committer | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-27 10:05:51 +0000 |
commit | 5d1646d90e1f2cceb9f0828f4b28318cd0ec7744 (patch) | |
tree | a94efe259b9009378be6d90eb30d2b019d95c194 /arch/mips/cobalt/time.c | |
parent | Initial commit. (diff) | |
download | linux-upstream/5.10.209.tar.xz linux-upstream/5.10.209.zip |
Adding upstream version 5.10.209.upstream/5.10.209upstream
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'arch/mips/cobalt/time.c')
-rw-r--r-- | arch/mips/cobalt/time.c | 41 |
1 files changed, 41 insertions, 0 deletions
diff --git a/arch/mips/cobalt/time.c b/arch/mips/cobalt/time.c new file mode 100644 index 000000000..1b6fa6649 --- /dev/null +++ b/arch/mips/cobalt/time.c @@ -0,0 +1,41 @@ +// SPDX-License-Identifier: GPL-2.0-or-later +/* + * Cobalt time initialization. + * + * Copyright (C) 2007 Yoichi Yuasa <yuasa@linux-mips.org> + */ +#include <linux/i8253.h> +#include <linux/init.h> + +#include <asm/gt64120.h> +#include <asm/time.h> + +#define GT641XX_BASE_CLOCK 50000000 /* 50MHz */ + +void __init plat_time_init(void) +{ + u32 start, end; + int i = HZ / 10; + + setup_pit_timer(); + + gt641xx_set_base_clock(GT641XX_BASE_CLOCK); + + /* + * MIPS counter frequency is measured during a 100msec interval + * using GT64111 timer0. + */ + while (!gt641xx_timer0_state()) + ; + + start = read_c0_count(); + + while (i--) + while (!gt641xx_timer0_state()) + ; + + end = read_c0_count(); + + mips_hpt_frequency = (end - start) * 10; + printk(KERN_INFO "MIPS counter frequency %dHz\n", mips_hpt_frequency); +} |