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2000-11-27 Joel Sherrill <joel@OARcorp.com>

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* README, sim68000.setup, clock/clockdrv.c: Modified to add
	support for timer as clock tick source.  Compiles but untested.
This commit is contained in:
Joel Sherrill
2000-11-27 17:52:48 +00:00
parent a080705682
commit 11edb53f85
3 changed files with 43 additions and 6 deletions
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5
c/src/lib/libbsp/m68k/sim68000/README
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@@ -4,7 +4,10 @@
BSP for the BSVC 68000 simulator. This is definitely under construction.
The initialization/setup script for BSVC is the part that likely needs
work.
work. I have written the timer based on the timer sample included with
bsvc 2.1.
At this point, hello does not even print.
--joel
1 August 2000

43
c/src/lib/libbsp/m68k/sim68000/clock/clockdrv.c
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@@ -6,17 +6,50 @@
#include <bsp.h>
#define CLOCK_VECTOR 0
#define CLOCK_VECTOR 84
#define Clock_driver_support_install_isr( _new, _old ) \
do { _old = (rtems_isr_entry) set_vector( _new, CLOCK_VECTOR, 1 ); } while(0)
#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"

1
c/src/lib/libbsp/m68k/sim68000/sim68000.setup
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@@ -5,3 +5,4 @@ SIMULATOR {sim68000}
COMMAND {AttachDevice 0 RAM {BaseAddress = 0 Size = 40000}}
COMMAND {AttachDevice 0 RAM {BaseAddress = 40000 Size = 20000}}
COMMAND {AttachDevice 0 M68681 {BaseAddress = 71001 OffsetToFirstRegister = 0 OffsetBetweenRegisters = 2 InterruptLevel = 4 PortAStandardInputOutputFlag = 0 PortBStandardInputOutputFlag = 0 PortACommand = xterm -T "M68681 Port A" -132 -fn fixed -e /usr3/tmp/bsvc-2.1/bin/xtermpipe PortBCommand = }}
COMMAND {AttachDevice 0 Timer {BaseAddress = 72001 IRQ = 5}}