Changeset 11edb53 in rtems for c/src/lib/libbsp/m68k/sim68000/clock/clockdrv.c

Timestamp:

Nov 27, 2000, 5:52:48 PM (20 years ago)

Author:

Joel Sherrill <joel.sherrill@…>

Branches:

4.10, 4.11, 4.8, 4.9, 5, master

Children:

66fedb46

Parents:

a080705

Message:

2000-11-27 Joel Sherrill <joel@…>

• README, sim68000.setup, clock/clockdrv.c: Modified to add support for timer as clock tick source. Compiles but untested.

File:

• c/src/lib/libbsp/m68k/sim68000/clock/clockdrv.c (modified) (2 diffs)

c/src/lib/libbsp/m68k/sim68000/clock/clockdrv.c

@@ -7 +7 @@
 #include <bsp.h>
 
-#define CLOCK_VECTOR 0
+#define CLOCK_VECTOR 84
 
 #define Clock_driver_support_install_isr( _new, _old )  \
@@ -13 +13 @@
 
 
-#define Clock_driver_support_initialize_hardware()
+typedef struct {
+  volatile unsigned8  cr;       /*  0 -  0 : Timer Control Register */
+  volatile unsigned8  pad0;     /*  1 -  1 : pad */
+  volatile unsigned8  ivr;      /*  2 -  2 : Timer Interrupt Vector Register */
+  volatile unsigned8  pad1;     /*  3 -  3 : pad */ 
+  volatile unsigned32 cpr;      /*  4 -  7 : Timer Counter Preload Register */
+  volatile unsigned8  pad2[12]; /*  8 - 19 : pad */ 
+  volatile unsigned32 sr;       /* 20 - 23 : Timer Status Register */
+} timer_hw_t;
 
-#define Clock_driver_support_at_tick() \
-  Clock_driver_support_initialize_hardware()
+#define TIMER_BASE (timer_hw_t *)0x72001
 
-#define Clock_driver_support_shutdown_hardware()
+/* 8 microseconds per click, 125,000 per second */
+
+/* XXX should check that microseconds_per_tick is >= 8 */
+void Clock_driver_support_initialize_hardware()
+{
+  timer_hw_t *t = TIMER_BASE;
+
+  t->ivr = CLOCK_VECTOR;
+  t->cpr = rtems_configuration_get_microseconds_per_tick() / 8;
+  t->cr  = 0xA0;  /* initialize with timer disabled */
+  t->cr  = 0xA1;  /* enable timer */
+}
+
+void Clock_driver_support_at_tick()
+{
+  timer_hw_t *t = TIMER_BASE;
+  
+  t->sr  = 0xA0;  /* Negate timer interrupt request */
+}
+  
+
+void Clock_driver_support_shutdown_hardware()
+{
+  timer_hw_t *t = TIMER_BASE;
+
+  t->cr  = 0xA0;  /* initialize with timer disabled */
+}
 
 #include "../../../shared/clockdrv_shell.c"