source: rtems/c/src/lib/libcpu/arm/mc9328mxl/clock/clockdrv.c @ 93f4a906

4.104.114.84.95
Last change on this file since 93f4a906 was 93f4a906, checked in by Joel Sherrill <joel.sherrill@…>, on Mar 12, 2007 at 11:17:07 AM

2007-03-12 Joel Sherrill <joel@…>

  • at91rm9200/clock/clock.c, at91rm9200/dbgu/dbgu.c, at91rm9200/include/at91rm9200.h, at91rm9200/include/at91rm9200_dbgu.h, at91rm9200/include/at91rm9200_emac.h, at91rm9200/include/at91rm9200_gpio.h, at91rm9200/include/at91rm9200_mem.h, at91rm9200/include/at91rm9200_pmc.h, at91rm9200/include/bits.h, at91rm9200/irq/bsp_irq_asm.S, at91rm9200/irq/bsp_irq_init.c, at91rm9200/irq/irq.c, at91rm9200/irq/irq.h, at91rm9200/pmc/pmc.c, at91rm9200/timer/timer.c, mc9328mxl/clock/clockdrv.c, mc9328mxl/include/mc9328mxl.h, mc9328mxl/irq/bsp_irq_asm.S, mc9328mxl/irq/bsp_irq_init.c, mc9328mxl/irq/irq.c, mc9328mxl/irq/irq.h, mc9328mxl/timer/timer.c, s3c2400/clock/clockdrv.c, s3c2400/timer/timer.c: Correct license URL and/or fix mistake in copyright notice. Both of these mistakes appear to be from code submitted after these changes were made previously.
  • Property mode set to 100644
File size: 4.5 KB
Line 
1/*
2 *  MC9328MXL clock specific using the System Timer
3 *
4 *  This is hardware specific part of the clock driver. At the end of this
5 *  file, the generic part of the driver is #included.
6 *
7 *  Copyright (c) 2004 by Cogent Computer Systems
8 *  Written by Jay Monkman <jtm@lopingdog.com>
9 *
10 *  The license and distribution terms for this file may be
11 *  found in the file LICENSE in this distribution or at
12 *
13 *  http://www.rtems.com/license/LICENSE.
14 *
15 *
16 *  clockdrv.c,v 1.1 2002/11/13 17:55:04 joel Exp
17*/
18#include <rtems.h>
19#include <bsp.h>
20#include <irq.h>
21#include <mc9328mxl.h>
22#include <rtems/bspIo.h>  /* for printk */
23
24/* this is defined in ../../../shared/clockdrv_shell.c */
25rtems_isr Clock_isr(rtems_vector_number vector);
26static void clock_isr_on(const rtems_irq_connect_data *unused);
27static void clock_isr_off(const rtems_irq_connect_data *unused);
28static int clock_isr_is_on(const rtems_irq_connect_data *irq);
29
30/* Replace the first value with the clock's interrupt name. */
31rtems_irq_connect_data clock_isr_data = {
32    .name   = BSP_INT_TIMER1,
33    .hdl    = (rtems_irq_hdl)Clock_isr,
34    .handle = (void *)BSP_INT_TIMER1,
35    .on     = clock_isr_on,
36    .off    = clock_isr_off,
37    .isOn   = clock_isr_is_on,
38};
39
40/* If you follow the code, this is never used, so any value
41 * should work
42 */
43#define CLOCK_VECTOR 0
44
45   
46/**
47 * When we get the clock interrupt
48 *    - clear the interrupt bit?
49 *    - restart the timer?
50 */
51#define Clock_driver_support_at_tick()                \
52  do {                                                \
53        uint32_t reg;                                 \
54        reg = MC9328MXL_TMR1_TSTAT;                   \
55        MC9328MXL_TMR1_TSTAT = 0;                     \
56  } while(0)
57
58
59/**
60 * Installs the clock ISR. You shouldn't need to change this.
61 */
62#define Clock_driver_support_install_isr( _new, _old ) \
63  do {                                                 \
64      (_old) = NULL;                                   \
65      BSP_install_rtems_irq_handler(&clock_isr_data);  \
66  } while(0)
67
68
69/**
70 * Initialize the hardware for the clock
71 *   - Set the frequency
72 *   - enable it
73 *   - clear any pending interrupts
74 *
75 * Since you may want the clock always running, you can
76 * enable interrupts here. If you do so, the clock_isr_on(),
77 * clock_isr_off(), and clock_isr_is_on() functions can be
78 * NOPs.
79 */
80#define Clock_driver_support_initialize_hardware() \
81  do { \
82        int freq; \
83        int cnt; \
84        freq = get_perclk1_freq(); \
85        printk("perclk1 freq is %d\n", freq); \
86        cnt = ((long long)freq * BSP_Configuration.microseconds_per_tick + 500000) / 1000000;\
87        printk("cnt freq is %d\n", cnt); \
88        MC9328MXL_TMR1_TCMP = cnt; \
89        /* use PERCLK1 as input, enable timer */ \
90        MC9328MXL_TMR1_TCTL = (MC9328MXL_TMR_TCTL_CLKSRC_PCLK1 | \
91                               MC9328MXL_TMR_TCTL_TEN | \
92                               MC9328MXL_TMR_TCTL_IRQEN); \
93        /* set prescaler to 1 (register value + 1) */ \
94        MC9328MXL_TMR1_TPRER = 0; \
95     } while (0)
96
97/**
98 * Do whatever you need to shut the clock down and remove the
99 * interrupt handler. Since this normally only gets called on
100 * RTEMS shutdown, you may not need to do anything other than
101 * remove the ISR.
102 */
103#define Clock_driver_support_shutdown_hardware()                        \
104  do {                                                                  \
105        /* Disable timer */ \
106        MC9328MXL_TMR1_TCTL = 0; \
107        BSP_remove_rtems_irq_handler(&clock_isr_data);                  \
108     } while (0)
109
110/**
111 * Enables clock interrupt.
112 *
113 * If the interrupt is always on, this can be a NOP.
114 */
115static void clock_isr_on(const rtems_irq_connect_data *unused)
116{
117    MC9328MXL_TMR1_TCTL |= MC9328MXL_TMR_TCTL_IRQEN;
118    MC9328MXL_AITC_INTENNUM = MC9328MXL_INT_TIMER1;
119
120    return;
121}
122
123/**
124 * Disables clock interrupts
125 *
126 * If the interrupt is always on, this can be a NOP.
127 */
128static void clock_isr_off(const rtems_irq_connect_data *unused)
129{
130    MC9328MXL_TMR1_TCTL &= ~MC9328MXL_TMR_TCTL_IRQEN;
131    MC9328MXL_AITC_INTDISNUM = MC9328MXL_INT_TIMER1;
132    return;
133}
134
135/**
136 * Tests to see if clock interrupt is enabled, and returns 1 if so.
137 * If interrupt is not enabled, returns 0.
138 *
139 * If the interrupt is always on, this always returns 1.
140 */
141static int clock_isr_is_on(const rtems_irq_connect_data *irq)
142{
143    return MC9328MXL_TMR1_TCTL & MC9328MXL_TMR_TCTL_IRQEN;
144}
145
146
147/* Make sure to include this, and only at the end of the file */
148#include "../../../../libbsp/shared/clockdrv_shell.c"
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