1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
|
/* SPDX-License-Identifier: BSD-2-Clause */
/**
* @file
*
* Instantiate the clock driver shell.
*/
/*
* COPYRIGHT (c) 1989-2012.
* On-Line Applications Research Corporation (OAR).
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*/
#include <rtems.h>
#include <bsp/irq.h>
#include <bsp.h>
/* #define CLOCK_DRIVER_USE_FAST_IDLE 1 */
#define CLOCK_VECTOR TX4925_IRQ_TMR0
#define TX4925_TIMER_INTERVAL_MODE 1
#define TX4925_TIMER_PULSE_MODE 2
#define TX4925_TIMER_MODE TX4925_TIMER_INTERVAL_MODE
#if (TX4925_TIMER_MODE == TX4925_TIMER_INTERVAL_MODE)
#define TX4925_TIMER_INTERRUPT_FLAG TIIS
#define Clock_driver_support_initialize_hardware() \
Initialize_timer0_in_interval_mode()
#elif (TX4925_TIMER_MODE == TX4925_TIMER_PULSE_MODE)
#define TX4925_TIMER_INTERRUPT_FLAG TPIBS
#define Clock_driver_support_initialize_hardware() \
Initialize_timer0_in_pulse_mode()
#else
#error "Build Error: need to select timer mode"
#endif
#define Clock_driver_support_install_isr( _new ) \
rtems_interrupt_handler_install( CLOCK_VECTOR, "clock", 0, _new, NULL )
#define Clock_driver_support_at_tick() \
do { \
uint32_t interrupt_flag; \
do { \
int loop_count; \
TX4925_REG_WRITE( TX4925_REG_BASE, TX4925_TIMER0_BASE + TX4925_TIMER_TISR, 0x0 ); /* Clear timer 0 interrupt */ \
loop_count = 0; \
do { /* Wait until interrupt flag is cleared (this prevents re-entering interrupt) */ \
/* Read back interrupt status register and isolate interval timer flag */ \
interrupt_flag = TX4925_REG_READ( TX4925_REG_BASE, TX4925_TIMER0_BASE + TX4925_TIMER_TISR ) & TX4925_TIMER_INTERRUPT_FLAG; \
} while (interrupt_flag && (++loop_count < 10)); /* Loop while timer interrupt bit is set, or loop count is lees than 10 */ \
} while(interrupt_flag); \
} while(0)
/* Setup timer in interval mode to generate peiodic interrupts */
#define Initialize_timer0_in_interval_mode() \
do { \
uint32_t temp; \
TX4925_REG_WRITE( TX4925_REG_BASE, TX4925_TIMER0_BASE + TX4925_TIMER_TCR, 0x0 ); /* Disable timer */ \
TX4925_REG_WRITE( TX4925_REG_BASE, TX4925_TIMER0_BASE + TX4925_TIMER_CCDR, 0x0 ); /* Set register for divide by 2 clock */ \
TX4925_REG_WRITE( TX4925_REG_BASE, TX4925_TIMER0_BASE + TX4925_TIMER_ITMR, TIMER_CLEAR_ENABLE_MASK ); /* Set interval timer mode register */ \
TX4925_REG_WRITE( TX4925_REG_BASE, TX4925_TIMER0_BASE + TX4925_TIMER_CPRA, 0x30d40 ); /* Set tmier period ,10.0 msec (20 MHz timer clock) */ \
TX4925_REG_WRITE( TX4925_REG_BASE, TX4925_TIMER0_BASE + TX4925_TIMER_TCR, 0xC0 ); /* Enable timer in interval mode */ \
TX4925_REG_WRITE( TX4925_REG_BASE, TX4925_IRQCTL_DM0, 0x0 ); /* Set interrupt controller detection mode */ \
TX4925_REG_WRITE( TX4925_REG_BASE, TX4925_IRQCTL_LVL2, 0x1000000 ); /* Set interrupt controller level */ \
TX4925_REG_WRITE( TX4925_REG_BASE, TX4925_IRQCTL_MSK, 0x0 ); /* Set interrupt controller mask */ \
TX4925_REG_WRITE( TX4925_REG_BASE, TX4925_IRQCTL_DEN, 0x1 ); /* Enable interrupts from controller */ \
temp = TX4925_REG_READ( TX4925_REG_BASE, TX4925_TIMER0_BASE + TX4925_TIMER_ITMR ); /* Enable interval timer interrupts */ \
temp |= TIMER_INT_ENABLE_MASK; \
TX4925_REG_WRITE( TX4925_REG_BASE, TX4925_TIMER0_BASE + TX4925_TIMER_ITMR, temp ); \
} while(0)
/* This mode is used to generate periodic interrupts and also output a pulse on PIO20 pin */
#define Initialize_timer0_in_pulse_mode() \
do { \
uint32_t temp; \
TX4925_REG_WRITE( TX4925_REG_BASE, TX4925_TIMER0_BASE + TX4925_TIMER_TCR, 0x0 ); /* Disable timer */ \
TX4925_REG_WRITE( TX4925_REG_BASE, TX4925_TIMER0_BASE + TX4925_TIMER_CCDR, 0x0 ); /* Set register for divide by 2 clock */ \
TX4925_REG_WRITE( TX4925_REG_BASE, TX4925_TIMER0_BASE + TX4925_TIMER_PGMR, FFI ); /* Set pulse generator mode register */ \
TX4925_REG_WRITE( TX4925_REG_BASE, TX4925_TIMER0_BASE + TX4925_TIMER_CPRA, 0x3e8 ); /* Set pulse high duration ,0.05 msec (20 MHz timer clock) */ \
/* TX4925_REG_WRITE( TX4925_REG_BASE, TX4925_TIMER0_BASE + TX4925_TIMER_CPRB, 0x1388 ); */ /* Set pulse total period, 0.25 msec (20 MHz timer clock) */ \
TX4925_REG_WRITE( TX4925_REG_BASE, TX4925_TIMER0_BASE + TX4925_TIMER_CPRB, 0x30d40 ); /* Set pulse total period, 10 msec (20 MHz timer clock) */ \
TX4925_REG_WRITE( TX4925_REG_BASE, TX4925_TIMER0_BASE + TX4925_TIMER_TCR, 0xC1 ); /* Enable timer in pulse generator mode */ \
\
/* Enable timer 0 output pulses on PIO20 */ \
temp = TX4925_REG_READ( TX4925_REG_BASE, TX4925_CFG_PCFG ); \
temp = (temp & ~ SELCHI) | SELTMR0; /* Enable timer 0 pulses on PIO20 */ \
TX4925_REG_WRITE( TX4925_REG_BASE, TX4925_CFG_PCFG, temp ); \
\
TX4925_REG_WRITE( TX4925_REG_BASE, TX4925_IRQCTL_DM0, 0x0 ); /* Set interrupt controller detection mode */ \
TX4925_REG_WRITE( TX4925_REG_BASE, TX4925_IRQCTL_LVL2, 0x1000000 ); /* Set interrupt controller level */ \
TX4925_REG_WRITE( TX4925_REG_BASE, TX4925_IRQCTL_MSK, 0x0 ); /* Set interrupt controller mask */ \
TX4925_REG_WRITE( TX4925_REG_BASE, TX4925_IRQCTL_DEN, 0x1 ); /* Enable interrupts from controller */ \
temp = TX4925_REG_READ( TX4925_REG_BASE, TX4925_TIMER0_BASE + TX4925_TIMER_PGMR ); /* Enable pulse generator interrupt */ \
temp |= TPIBE; /* Only want interrupts on B compare (where clock count is cleared) */ \
TX4925_REG_WRITE( TX4925_REG_BASE, TX4925_TIMER0_BASE + TX4925_TIMER_PGMR, temp ); \
} while(0)
#define CLOCK_DRIVER_USE_DUMMY_TIMECOUNTER
#include "../../../shared/dev/clock/clockimpl.h"
|