diff options
Diffstat (limited to 'arch/blackfin/kernel/time.c')
| -rw-r--r-- | arch/blackfin/kernel/time.c | 19 |
1 files changed, 3 insertions, 16 deletions
diff --git a/arch/blackfin/kernel/time.c b/arch/blackfin/kernel/time.c index 715b3945e4c7..eb2352320454 100644 --- a/arch/blackfin/kernel/time.c +++ b/arch/blackfin/kernel/time.c | |||
| @@ -6,9 +6,10 @@ | |||
| 6 | * Created: | 6 | * Created: |
| 7 | * Description: This file contains the bfin-specific time handling details. | 7 | * Description: This file contains the bfin-specific time handling details. |
| 8 | * Most of the stuff is located in the machine specific files. | 8 | * Most of the stuff is located in the machine specific files. |
| 9 | * FIXME: (This file is subject for removal) | ||
| 9 | * | 10 | * |
| 10 | * Modified: | 11 | * Modified: |
| 11 | * Copyright 2004-2006 Analog Devices Inc. | 12 | * Copyright 2004-2008 Analog Devices Inc. |
| 12 | * | 13 | * |
| 13 | * Bugs: Enter bugs at http://blackfin.uclinux.org/ | 14 | * Bugs: Enter bugs at http://blackfin.uclinux.org/ |
| 14 | * | 15 | * |
| @@ -35,6 +36,7 @@ | |||
| 35 | #include <linux/irq.h> | 36 | #include <linux/irq.h> |
| 36 | 37 | ||
| 37 | #include <asm/blackfin.h> | 38 | #include <asm/blackfin.h> |
| 39 | #include <asm/time.h> | ||
| 38 | 40 | ||
| 39 | /* This is an NTP setting */ | 41 | /* This is an NTP setting */ |
| 40 | #define TICK_SIZE (tick_nsec / 1000) | 42 | #define TICK_SIZE (tick_nsec / 1000) |
| @@ -47,21 +49,6 @@ static struct irqaction bfin_timer_irq = { | |||
| 47 | .flags = IRQF_DISABLED | 49 | .flags = IRQF_DISABLED |
| 48 | }; | 50 | }; |
| 49 | 51 | ||
| 50 | /* | ||
| 51 | * The way that the Blackfin core timer works is: | ||
| 52 | * - CCLK is divided by a programmable 8-bit pre-scaler (TSCALE) | ||
| 53 | * - Every time TSCALE ticks, a 32bit is counted down (TCOUNT) | ||
| 54 | * | ||
| 55 | * If you take the fastest clock (1ns, or 1GHz to make the math work easier) | ||
| 56 | * 10ms is 10,000,000 clock ticks, which fits easy into a 32-bit counter | ||
| 57 | * (32 bit counter is 4,294,967,296ns or 4.2 seconds) so, we don't need | ||
| 58 | * to use TSCALE, and program it to zero (which is pass CCLK through). | ||
| 59 | * If you feel like using it, try to keep HZ * TIMESCALE to some | ||
| 60 | * value that divides easy (like power of 2). | ||
| 61 | */ | ||
| 62 | |||
| 63 | #define TIME_SCALE 1 | ||
| 64 | |||
| 65 | static void | 52 | static void |
| 66 | time_sched_init(irq_handler_t timer_routine) | 53 | time_sched_init(irq_handler_t timer_routine) |
| 67 | { | 54 | { |
