source: rtems/c/src/lib/libbsp/powerpc/t32mppc/clock/clock-config.c @ 7078a00b

Last change on this file since 7078a00b was 7078a00b, checked in by Sebastian Huber <sebastian.huber@…>, on Nov 8, 2017 at 12:13:32 PM

bsp/t32mppc: Use fixed exception handlers

  • Property mode set to 100644
File size: 1.7 KB
Line 
1/*
2 * Copyright (c) 2011, 2017 embedded brains GmbH.  All rights reserved.
3 *
4 *  embedded brains GmbH
5 *  Dornierstr. 4
6 *  82178 Puchheim
7 *  Germany
8 *  <rtems@embedded-brains.de>
9 *
10 * The license and distribution terms for this file may be
11 * found in the file LICENSE in this distribution or at
12 * http://www.rtems.org/license/LICENSE.
13 */
14
15#include <rtems/timecounter.h>
16
17#include <libcpu/powerpc-utility.h>
18
19#include <bsp.h>
20#include <bsp/irq.h>
21
22/* This is defined in clockdrv_shell.h */
23static rtems_isr Clock_isr(void *arg);
24
25static struct timecounter t32mppc_clock_tc;
26
27#define CLOCK_DRIVER_USE_ONLY_BOOT_PROCESSOR
28
29void t32mppc_decrementer_dispatch(void)
30{
31  PPC_SET_SPECIAL_PURPOSE_REGISTER(BOOKE_TSR, BOOKE_TSR_DIS);
32  Clock_isr(NULL);
33}
34
35static uint32_t t32mppc_clock_get_timecount(struct timecounter *tc)
36{
37  return ppc_time_base();
38}
39
40static void t32mppc_clock_initialize(void)
41{
42  uint64_t frequency = bsp_time_base_frequency / 10;
43  uint32_t us_per_tick = rtems_configuration_get_microseconds_per_tick();
44  uint32_t interval = (uint32_t) ((frequency * us_per_tick) / 1000000);
45
46  PPC_SET_SPECIAL_PURPOSE_REGISTER(BOOKE_DECAR, interval - 1);
47  PPC_SET_SPECIAL_PURPOSE_REGISTER_BITS(
48    BOOKE_TCR,
49    BOOKE_TCR_DIE | BOOKE_TCR_ARE
50  );
51  ppc_set_decrementer_register(interval - 1);
52
53  t32mppc_clock_tc.tc_get_timecount = t32mppc_clock_get_timecount;
54  t32mppc_clock_tc.tc_counter_mask = 0xffffffff;
55  t32mppc_clock_tc.tc_frequency = bsp_time_base_frequency;
56  t32mppc_clock_tc.tc_quality = RTEMS_TIMECOUNTER_QUALITY_CLOCK_DRIVER;
57  rtems_timecounter_install(&t32mppc_clock_tc);
58}
59
60#define Clock_driver_support_initialize_hardware() \
61  t32mppc_clock_initialize()
62
63/* Include shared source clock driver code */
64#include "../../../shared/clockdrv_shell.h"
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