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arm/a9mpcore: Add support to get the clock via a weak linkage function.

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This allows an application to provide a localised clock freq with
needing to go down the BSP opts path. This is important with the
Zynq where the Xilinx tools generate the frequency.
This commit is contained in:
Chris Johns
2013-12-19 14:49:11 +11:00
parent 6c1e53014e
commit f466e567a1
3 changed files with 46 additions and 3 deletions
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17
c/src/lib/libbsp/arm/shared/arm-a9mpcore-clock-config.c
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@@ -18,9 +18,19 @@
#define A9MPCORE_PT ((volatile a9mpcore_pt *) BSP_ARM_A9MPCORE_PT_BASE)
static uint64_t a9mpcore_clock_last_tick_k;
/* This is defined in clockdrv_shell.h */
void Clock_isr(rtems_irq_hdl_param arg);
uint32_t a9mpcore_clock_periphclk(void) __attribute__ ((weak));
uint32_t a9mpcore_clock_periphclk(void)
{
/* default to the BSP option. */
return BSP_ARM_A9MPCORE_PERIPHCLK;
}
static void a9mpcore_clock_at_tick(void)
{
volatile a9mpcore_pt *pt = A9MPCORE_PT;
@@ -50,9 +60,12 @@ static void a9mpcore_clock_handler_install(void)
static void a9mpcore_clock_initialize(void)
{
volatile a9mpcore_pt *pt = A9MPCORE_PT;
uint64_t interval = ((uint64_t) BSP_ARM_A9MPCORE_PERIPHCLK
uint64_t periphclk = (uint64_t) a9mpcore_clock_periphclk();
uint64_t interval = (periphclk
* (uint64_t) rtems_configuration_get_microseconds_per_tick()) / 1000000;
a9mpcore_clock_last_tick_k = (1000000000ULL << 32) / periphclk;
pt->load = (uint32_t) interval - 1;
pt->ctrl = A9MPCORE_PT_CTRL_AUTO_RLD
| A9MPCORE_PT_CTRL_IRQ_EN
@@ -83,7 +96,7 @@ static void a9mpcore_clock_cleanup(void)
static uint32_t a9mpcore_clock_nanoseconds_since_last_tick(void)
{
volatile a9mpcore_pt *pt = A9MPCORE_PT;
uint64_t k = (1000000000ULL << 32) / BSP_ARM_A9MPCORE_PERIPHCLK;
uint64_t k = a9mpcore_clock_last_tick_k;
uint32_t c = pt->cntr;
uint32_t p = pt->load + 1;

29
c/src/lib/libbsp/arm/shared/include/arm-a9mpcore-clock.h Normal file
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@@ -0,0 +1,29 @@
/*
* Copyright (c) 2013 Chris Johns <chrisj@rtems.org>. All rights reserved.
*
* The license and distribution terms for this file may be
* found in the file LICENSE in this distribution or at
* http://www.rtems.com/license/LICENSE.
*/
#ifndef LIBBSP_ARM_SHARED_ARM_A9MPCORE_CLOCK_H
#define LIBBSP_ARM_SHARED_ARM_A9MPCORE_CLOCK_H
#include <bsp.h>
#ifdef __cplusplus
extern "C" {
#endif /* __cplusplus */
/*
* Return the peripheral clock. For systems such as the zynq this
* is controlled by the PL logic generation and can vary. Provide this
* function in your application to override the BSP default.
*/
uint32_t a9mpcore_clock_periphclk(void);
#ifdef __cplusplus
}
#endif /* __cplusplus */
#endif /* LIBBSP_ARM_SHARED_ARM_A9MPCORE_CLOCK_H */

3
c/src/lib/libbsp/arm/xilinx-zynq/Makefile.am
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@@ -33,6 +33,7 @@ include_bsp_HEADERS += ../../shared/include/irq-info.h
include_bsp_HEADERS += ../../shared/include/stackalloc.h
include_bsp_HEADERS += ../../shared/tod.h
include_bsp_HEADERS += ../shared/include/start.h
include_bsp_HEADERS += ../shared/include/arm-a9mpcore-clock.h
include_bsp_HEADERS += ../shared/include/arm-a9mpcore-irq.h
include_bsp_HEADERS += ../shared/include/arm-a9mpcore-regs.h
include_bsp_HEADERS += ../shared/include/arm-a9mpcore-start.h
@@ -127,7 +128,7 @@ libbsp_a_SOURCES += include/cache_.h
libbsp_a_CPPFLAGS += -I$(srcdir)/include
# Start hooks
libbsp_a_SOURCES += startup/bspstarthooks.c
libbsp_a_SOURCES += startup/bspstarthooks.c startup/bspstartmmu.c
if HAS_SMP
libbsp_a_SOURCES += ../shared/arm-a9mpcore-smp.c