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author | Thomas Doerfler <Thomas.Doerfler@embedded-brains.de> | 2009-10-30 19:28:46 +0000 |
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committer | Thomas Doerfler <Thomas.Doerfler@embedded-brains.de> | 2009-10-30 19:28:46 +0000 |
commit | 3fcc78aef99863b91fa3c32f4ca72bfc6d03b056 (patch) | |
tree | 2b663cb4403cbc2e81c59007ebfb181fb4acee11 /c | |
parent | 2009-10-30 Glenn Humphrey <glenn.humphrey@oarcorp.com> (diff) | |
download | rtems-3fcc78aef99863b91fa3c32f4ca72bfc6d03b056.tar.bz2 |
move timebase access functions from cpukit to libcpu
Diffstat (limited to 'c')
-rw-r--r-- | c/src/lib/libbsp/powerpc/tqm8xx/ChangeLog | 4 | ||||
-rw-r--r-- | c/src/lib/libbsp/powerpc/tqm8xx/startup/bspstart.c | 2 | ||||
-rw-r--r-- | c/src/lib/libcpu/powerpc/ChangeLog | 5 | ||||
-rw-r--r-- | c/src/lib/libcpu/powerpc/mpc6xx/timer/timer.c | 2 | ||||
-rw-r--r-- | c/src/lib/libcpu/powerpc/shared/include/powerpc-utility.h | 110 |
5 files changed, 122 insertions, 1 deletions
diff --git a/c/src/lib/libbsp/powerpc/tqm8xx/ChangeLog b/c/src/lib/libbsp/powerpc/tqm8xx/ChangeLog index b2cf2997fa..f080c18408 100644 --- a/c/src/lib/libbsp/powerpc/tqm8xx/ChangeLog +++ b/c/src/lib/libbsp/powerpc/tqm8xx/ChangeLog @@ -1,3 +1,7 @@ +2009-10-28 Thomas Doerfler <Thomas.Doerfler@embedded-brains.de> + + * startup/bspstart.s: correct clock tick init + 2009-10-23 Ralf Corsépius <ralf.corsepius@rtems.org> * console/console.c: Include <rtems/error.h>. diff --git a/c/src/lib/libbsp/powerpc/tqm8xx/startup/bspstart.c b/c/src/lib/libbsp/powerpc/tqm8xx/startup/bspstart.c index fa1c5e94a1..d701ed7291 100644 --- a/c/src/lib/libbsp/powerpc/tqm8xx/startup/bspstart.c +++ b/c/src/lib/libbsp/powerpc/tqm8xx/startup/bspstart.c @@ -173,7 +173,7 @@ void bsp_start( void) BSP_panic("Cannot determine BUS frequency\n"); } - bsp_clicks_per_usec = 0; /* force to zero to control + bsp_clicks_per_usec = BSP_bus_frequency/16; /* force to zero to control * PIT clock driver from EXTCLK */ bsp_timer_least_valid = 3; diff --git a/c/src/lib/libcpu/powerpc/ChangeLog b/c/src/lib/libcpu/powerpc/ChangeLog index 80ccbcff23..6a234984d4 100644 --- a/c/src/lib/libcpu/powerpc/ChangeLog +++ b/c/src/lib/libcpu/powerpc/ChangeLog @@ -1,3 +1,8 @@ +2009-10-23 Thomas Doerfler <Thomas.Doerfler@imd-systems.de> + + * shared/include/powerpc-utility.h, mpc6xx/timer/timer.c: + moved timebase/decrementer access from cpukit to libcpu + 2009-10-23 Sebastian Huber <sebastian.huber@embedded-brains.de> * new-exceptions/e500_raw_exc_init.c, new-exceptions/raw_exception.c, diff --git a/c/src/lib/libcpu/powerpc/mpc6xx/timer/timer.c b/c/src/lib/libcpu/powerpc/mpc6xx/timer/timer.c index 0a72553b1d..bc9ed1e7b2 100644 --- a/c/src/lib/libcpu/powerpc/mpc6xx/timer/timer.c +++ b/c/src/lib/libcpu/powerpc/mpc6xx/timer/timer.c @@ -18,6 +18,8 @@ #include <assert.h> #include <rtems.h> #include <bsp.h> +#include <libcpu/powerpc-utility.h> + uint64_t Timer_driver_Start_time; diff --git a/c/src/lib/libcpu/powerpc/shared/include/powerpc-utility.h b/c/src/lib/libcpu/powerpc/shared/include/powerpc-utility.h index ca615060fa..05d663e457 100644 --- a/c/src/lib/libcpu/powerpc/shared/include/powerpc-utility.h +++ b/c/src/lib/libcpu/powerpc/shared/include/powerpc-utility.h @@ -242,6 +242,116 @@ static inline void ppc_external_exceptions_disable(uint32_t msr) RTEMS_COMPILER_MEMORY_BARRIER(); } +#ifndef ASM +/* + * Simple spin delay in microsecond units for device drivers. + * This is very dependent on the clock speed of the target. + */ + +#if defined(mpx8xx) || defined(mpc860) || defined(mpc821) +/* Wonderful bookE doesn't have mftb/mftbu; they only + * define the TBRU/TBRL SPRs so we use these. Luckily, + * we run in supervisory mode so that should work on + * all CPUs. In user mode we'd have a problem... + * 2007/11/30, T.S. + * + * OTOH, PSIM currently lacks support for reading + * SPRs 268/269. You need GDB patch sim/2376 to avoid + * a crash... + * OTOH, the MPC8xx do not allow to read the timebase registers via mfspr. + * we NEED a mftb to access the time base. + * 2009/10/30 Th. D. + */ +#define CPU_Get_timebase_low( _value ) \ + asm volatile( "mftb %0" : "=r" (_value) ) +#else +#define CPU_Get_timebase_low( _value ) \ + asm volatile( "mfspr %0,268" : "=r" (_value) ) +#endif + +/* Must be provided for rtems_bsp_delay to work */ +extern uint32_t bsp_clicks_per_usec; + +#define rtems_bsp_delay( _microseconds ) \ + do { \ + uint32_t start, ticks, now; \ + CPU_Get_timebase_low( start ) ; \ + ticks = (_microseconds) * bsp_clicks_per_usec; \ + do \ + CPU_Get_timebase_low( now ) ; \ + while (now - start < ticks); \ + } while (0) + +#define rtems_bsp_delay_in_bus_cycles( _cycles ) \ + do { \ + uint32_t start, now; \ + CPU_Get_timebase_low( start ); \ + do \ + CPU_Get_timebase_low( now ); \ + while (now - start < (_cycles)); \ + } while (0) + +#endif /* ASM */ + +#ifndef ASM +/* + * Routines to access the decrementer register + */ + +#define PPC_Set_decrementer( _clicks ) \ + do { \ + asm volatile( "mtdec %0" : : "r" ((_clicks)) ); \ + } while (0) + +#define PPC_Get_decrementer( _clicks ) \ + asm volatile( "mfdec %0" : "=r" (_clicks) ) + +#endif /* ASM */ + +#ifndef ASM +/* + * Routines to access the time base register + */ + +static inline uint64_t PPC_Get_timebase_register( void ) +{ + uint32_t tbr_low; + uint32_t tbr_high; + uint32_t tbr_high_old; + uint64_t tbr; + + do { +#if defined(mpx8xx) || defined(mpc860) || defined(mpc821) +/* See comment above (CPU_Get_timebase_low) */ + asm volatile( "mftbu %0" : "=r" (tbr_high_old)); + asm volatile( "mftb %0" : "=r" (tbr_low)); + asm volatile( "mftbu %0" : "=r" (tbr_high)); +#else + asm volatile( "mfspr %0, 269" : "=r" (tbr_high_old)); + asm volatile( "mfspr %0, 268" : "=r" (tbr_low)); + asm volatile( "mfspr %0, 269" : "=r" (tbr_high)); +#endif + } while ( tbr_high_old != tbr_high ); + + tbr = tbr_high; + tbr <<= 32; + tbr |= tbr_low; + return tbr; +} + +static inline void PPC_Set_timebase_register (uint64_t tbr) +{ + uint32_t tbr_low; + uint32_t tbr_high; + + tbr_low = (uint32_t) tbr; + tbr_high = (uint32_t) (tbr >> 32); + asm volatile( "mtspr 284, %0" : : "r" (tbr_low)); + asm volatile( "mtspr 285, %0" : : "r" (tbr_high)); + +} +#endif /* ASM */ + static inline uint32_t ppc_decrementer_register(void) { uint32_t dec; |