diff options
| author | Jayachandran C <jchandra@broadcom.com> | 2013-01-14 19:11:57 +0400 |
|---|---|---|
| committer | John Crispin <blogic@openwrt.org> | 2013-02-17 03:15:20 +0400 |
| commit | 4e45e542cd742c1c3e30e7f252640644c66548b5 (patch) | |
| tree | d2c744190851b06cf7cd326ff3df16d2a6badae3 /arch/mips/include/asm/netlogic/xlp-hal/pic.h | |
| parent | a69ba6293d11b7dfd395a742f3449d6ddda8ecad (diff) | |
| download | linux-4e45e542cd742c1c3e30e7f252640644c66548b5.tar.xz | |
MIPS: Netlogic: Use PIC timer as a clocksource
The XLR/XLS/XLP PIC has a 8 countdown timers which run at the PIC
frequencey. One of these can be used as a clocksource to provide
timestamps that is common across cores. This can be used in place
of the count/compare clocksource which is per-CPU.
On XLR/XLS PIC registers are 32-bit, so we just use the lower 32-bits
of the PIC counter. On XLP, the whole 64-bit can be used.
Provide common macros and functions for PIC timer registers on XLR/XLS
and XLP, and use them to register a PIC clocksource.
Signed-off-by: Jayachandran C <jchandra@broadcom.com>
Patchwork: http://patchwork.linux-mips.org/patch/4786/
Signed-off-by: John Crispin <blogic@openwrt.org>
Diffstat (limited to 'arch/mips/include/asm/netlogic/xlp-hal/pic.h')
| -rw-r--r-- | arch/mips/include/asm/netlogic/xlp-hal/pic.h | 12 |
1 files changed, 10 insertions, 2 deletions
diff --git a/arch/mips/include/asm/netlogic/xlp-hal/pic.h b/arch/mips/include/asm/netlogic/xlp-hal/pic.h index b2e53a5383ab..ea6768c3e9f8 100644 --- a/arch/mips/include/asm/netlogic/xlp-hal/pic.h +++ b/arch/mips/include/asm/netlogic/xlp-hal/pic.h @@ -261,6 +261,8 @@ #define PIC_LOCAL_SCHEDULING 1 #define PIC_GLOBAL_SCHEDULING 0 +#define PIC_CLK_HZ 133333333 + #define nlm_read_pic_reg(b, r) nlm_read_reg64(b, r) #define nlm_write_pic_reg(b, r, v) nlm_write_reg64(b, r, v) #define nlm_get_pic_pcibase(node) nlm_pcicfg_base(XLP_IO_PIC_OFFSET(node)) @@ -315,6 +317,12 @@ nlm_pic_read_timer(uint64_t base, int timer) return nlm_read_pic_reg(base, PIC_TIMER_COUNT(timer)); } +static inline uint32_t +nlm_pic_read_timer32(uint64_t base, int timer) +{ + return (uint32_t)nlm_read_pic_reg(base, PIC_TIMER_COUNT(timer)); +} + static inline void nlm_pic_write_timer(uint64_t base, int timer, uint64_t value) { @@ -376,9 +384,9 @@ nlm_pic_ack(uint64_t base, int irt_num) } static inline void -nlm_pic_init_irt(uint64_t base, int irt, int irq, int hwt) +nlm_pic_init_irt(uint64_t base, int irt, int irq, int hwt, int en) { - nlm_pic_write_irt_direct(base, irt, 0, 0, 0, irq, hwt); + nlm_pic_write_irt_direct(base, irt, en, 0, 0, irq, hwt); } int nlm_irq_to_irt(int irq); |