patch-2.4.19 linux-2.4.19/arch/mips/galileo-boards/ev64120/cntmr.c

• Lines: 208
• Date: Fri Aug 2 17:39:43 2002
• Orig file: linux-2.4.18/arch/mips/galileo-boards/ev64120/cntmr.c
• Orig date: Wed Dec 31 16:00:00 1969

diff -urN linux-2.4.18/arch/mips/galileo-boards/ev64120/cntmr.c linux-2.4.19/arch/mips/galileo-boards/ev64120/cntmr.c
@@ -0,0 +1,207 @@
+/* cntmr.c - GT counters/timers functions */
+
+/* Copyright - Galileo technology. 9/3/2000 */
+
+/*
+DESCRIPTION
+This file contains function which serves the user with a complete interface
+to the GT internal counters and timers, please advise: each counter/timer unit
+can function only as a counter or a timer at current time.
+Counter/timer 0 is 32 bit wide.
+Counters/timers 1-3 are 24 bit wide.
+*/
+
+/* includes */
+
+#ifdef __linux__
+#include <asm/galileo/evb64120A/cntmr.h>
+#include <asm/galileo/evb64120A/core.h>
+#else
+#include "cntmr.h"
+#include "core.h"
+#endif
+
+/********************************************************************
+* cntTmrStart - Starts a counter/timer with given an initiate value.
+*
+* INPUTS:  unsigned int countNum - Selects one of the 8 counters/timers.
+*          unsigned int countValue - Initial value for count down. 
+*          CNT_TMR_OP_MODES opMode - Set Mode, Counter or Timer.
+*
+* RETURNS: false if one of the parameters is erroneous, true otherwise.
+*********************************************************************/
+
+bool cntTmrStart(CNTMR_NUM countNum, unsigned int countValue,
+		 CNT_TMR_OP_MODES opMode)
+{
+	unsigned int command = 1;
+	unsigned int value;
+
+	if (countNum > LAST_CNTMR)
+		return false;
+	else {
+		GT_REG_READ(TIMER_COUNTER_CONTROL, &value);
+		cntTmrDisable(countNum);
+		GT_REG_WRITE((TIMER_COUNTER0 + (4 * countNum)),
+			     countValue);
+		command = command << countNum * 2;
+		value = value | command;
+		command = command << 1;
+		switch (opMode) {
+		case TIMER:	/* The Timer/Counter bit set to logic '1' */
+			value = value | command;
+			break;
+		case COUNTER:	/* The Timer/Counter bit set to logic '0' */
+			value = value & ~command;
+			break;
+		default:
+			return false;
+		}
+		GT_REG_WRITE(TIMER_COUNTER_CONTROL, value);
+		return true;
+	}
+}
+
+/********************************************************************
+* cntTmrDisable - Disables the timer/counter operation and return its 
+*                 value.
+*
+* INPUTS:  unsigned int countNum - Selects one of the 8 counters/timers.
+* RETURNS: The counter/timer value (unsigned int), if any of the arguments are 
+*          erroneous return 0.
+*********************************************************************/
+
+unsigned int cntTmrDisable(CNTMR_NUM countNum)
+{
+	unsigned int command = 1;
+	unsigned int regValue;
+	unsigned int value;
+
+	GT_REG_READ(TIMER_COUNTER_CONTROL, &value);
+	if (countNum > LAST_CNTMR)
+		return 0;
+	GT_REG_READ(TIMER_COUNTER0 + 4 * countNum, &regValue);
+	command = command << countNum * 2;	/* Disable the timer/counter */
+	value = value & ~command;
+	GT_REG_WRITE(TIMER_COUNTER_CONTROL, value);
+	return regValue;
+}
+
+/********************************************************************
+* cntTmrRead - Reads a timer or a counter value. (This operation can be
+*              perform while the counter/timer is active).
+*
+* RETURNS: The counter/timer value. If wrong input value, return 0.
+*********************************************************************/
+
+unsigned int cntTmrRead(CNTMR_NUM countNum)
+{
+	unsigned int value;
+	if (countNum > LAST_CNTMR)
+		return 0;
+	else
+		GT_REG_READ(TIMER_COUNTER0 + countNum * 4, &value);
+	return value;
+}
+
+/********************************************************************
+* cntTmrEnable - Set enable-bit of timer/counter.
+*                Be aware: If the counter/timer is active, this function
+*                          will terminate with an false.
+*
+* INPUTS:  unsigned int countNum - Selects one of the 8 counters/timers.
+* RETURNS: false if one of the parameters is erroneous, true otherwise.
+*********************************************************************/
+
+bool cntTmrEnable(CNTMR_NUM countNum)
+{
+	unsigned int command = 1;
+	unsigned int value;
+	GT_REG_READ(TIMER_COUNTER_CONTROL, &value);
+	if (countNum > LAST_CNTMR)
+		return false;
+	else {
+		command = command << countNum * 2;
+		if ((command & value) != 0)	/* ==> The counter/timer is enabled */
+			return false;	/* doesn't make sense to Enable an "enabled" counter */
+		value = value | command;
+		GT_REG_WRITE(TIMER_COUNTER_CONTROL, value);
+		return true;
+	}
+}
+
+/********************************************************************
+* cntTmrLoad - loading value for timer number countNum.
+*              Be aware: If this function try to load value to an enabled
+*                        counter/timer it terminate with false.
+*
+* INPUTS:  unsigned int countNum - Selects one of the 8 counters/timers.
+*          unsigned int countValue - The value for load the register.
+* RETURNS: false if one of the parameters is erroneous, true otherwise.
+*********************************************************************/
+
+bool cntTmrLoad(unsigned int countNum, unsigned int countValue)
+{
+	unsigned int command = 1;
+	unsigned int value;
+	GT_REG_READ(TIMER_COUNTER_CONTROL, &value);
+	if (countNum > LAST_CNTMR)
+		return false;
+	else {
+		command = command << countNum * 2;
+		value = value & command;
+		if (value != 0) {	/* ==> The counter/timer is enabled */
+			return false;	/* can't reload value when counter/timer is enabled */
+		} else {
+			GT_REG_WRITE((TIMER_COUNTER0 + (4 * countNum)),
+				     countValue);
+			return true;
+		}
+
+	}
+}
+
+/********************************************************************
+* cntTmrSetMode - Configurate the Mode of the channel to work as a counter
+*                 or as a timer. (for more details on the different between
+*                 those two modes is written in the Data Sheet).
+*                 NOTE: This function only set the counter/timer mode and
+*                 don't enable it. 
+*                 Be aware: If this function try to load value to an enabled
+*                           counter/timer it terminate with false.
+* 
+* INPUTS:  unsigned int countNum - Selects one of the 8 counters/timers.
+*          CNT_TMR_OP_MODES opMode - TIMER or COUNTER mode.
+* RETURNS: false if one of the parameters is erroneous true otherwise .
+*********************************************************************/
+
+bool cntTmrSetMode(CNTMR_NUM countNum, CNT_TMR_OP_MODES opMode)
+{
+	unsigned int command = 1;
+	unsigned int value;
+
+	GT_REG_READ(TIMER_COUNTER_CONTROL, &value);
+	if (countNum > LAST_CNTMR)
+		return false;
+	else {
+		command = command << countNum * 2;
+		value = value & command;
+		if (value != 0) {	/* ==> The counter/timer is enabled */
+			return false;	/* can't set the Mode when counter/timer is enabled */
+		} else {
+			command = command << 1;
+			switch (opMode) {
+			case TIMER:
+				value = value | command;	/* The Timer/Counter bit set to logic '1' */
+				break;
+			case COUNTER:
+				value = value & ~command;	/*The Timer/Counter bit set to logic '0' */
+				break;
+			default:
+				return false;
+			}
+			GT_REG_WRITE(TIMER_COUNTER_CONTROL, value);
+			return true;
+		}
+	}
+}