From 11edb53f852eb9ff2c8c6c7f69445ba15e67824d Mon Sep 17 00:00:00 2001 From: Joel Sherrill Date: Mon, 27 Nov 2000 17:52:48 +0000 Subject: 2000-11-27 Joel Sherrill * README, sim68000.setup, clock/clockdrv.c: Modified to add support for timer as clock tick source. Compiles but untested. --- c/src/lib/libbsp/m68k/sim68000/README | 5 ++- c/src/lib/libbsp/m68k/sim68000/clock/clockdrv.c | 47 +++++++++++++++++++++---- c/src/lib/libbsp/m68k/sim68000/sim68000.setup | 1 + 3 files changed, 45 insertions(+), 8 deletions(-) (limited to 'c/src/lib/libbsp/m68k') diff --git a/c/src/lib/libbsp/m68k/sim68000/README b/c/src/lib/libbsp/m68k/sim68000/README index 6509e7a1b9..5db6f31b18 100644 --- a/c/src/lib/libbsp/m68k/sim68000/README +++ b/c/src/lib/libbsp/m68k/sim68000/README @@ -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 diff --git a/c/src/lib/libbsp/m68k/sim68000/clock/clockdrv.c b/c/src/lib/libbsp/m68k/sim68000/clock/clockdrv.c index a2f865f5eb..86e9734960 100644 --- a/c/src/lib/libbsp/m68k/sim68000/clock/clockdrv.c +++ b/c/src/lib/libbsp/m68k/sim68000/clock/clockdrv.c @@ -6,17 +6,50 @@ #include -#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() - -#define Clock_driver_support_at_tick() \ - Clock_driver_support_initialize_hardware() - -#define Clock_driver_support_shutdown_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 TIMER_BASE (timer_hw_t *)0x72001 + +/* 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" diff --git a/c/src/lib/libbsp/m68k/sim68000/sim68000.setup b/c/src/lib/libbsp/m68k/sim68000/sim68000.setup index e95c9a695a..efbbe75930 100644 --- a/c/src/lib/libbsp/m68k/sim68000/sim68000.setup +++ b/c/src/lib/libbsp/m68k/sim68000/sim68000.setup @@ -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}} -- cgit v1.2.3