ENGR00119716: MX28 basic support.

Add mx28 to u-boot and pass the compiling.

Signed-off-by: Terry Lv <r65388@freescale.com>

1 files changed, 245 insertions, 0 deletions

diff --git a/cpu/arm926ejs/mx28/timer.c b/cpu/arm926ejs/mx28/timer.c
new file mode 100644
index 0000000..ffad4d8
--- /dev/null
+++ b/cpu/arm926ejs/mx28/timer.c
@@ -0,0 +1,245 @@
+/*
+ * (C) Copyright 2003
+ * Texas Instruments <www.ti.com>
+ *
+ * (C) Copyright 2002
+ * Sysgo Real-Time Solutions, GmbH <www.elinos.com>
+ * Marius Groeger <mgroeger@sysgo.de>
+ *
+ * (C) Copyright 2002
+ * Sysgo Real-Time Solutions, GmbH <www.elinos.com>
+ * Alex Zuepke <azu@sysgo.de>
+ *
+ * (C) Copyright 2002-2004
+ * Gary Jennejohn, DENX Software Engineering, <gj@denx.de>
+ *
+ * (C) Copyright 2004
+ * Philippe Robin, ARM Ltd. <philippe.robin@arm.com>
+ *
+ * (C) Copyright 2009 Freescale Semiconductor, Inc.
+ *
+ * See file CREDITS for list of people who contributed to this
+ * project.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License as
+ * published by the Free Software Foundation; either version 2 of
+ * the License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.	 See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
+ * MA 02111-1307 USA
+ */
+
+#include <common.h>
+#include <asm/arch/mx28.h>
+#include <asm/arch/timrot.h>
+
+#define CONFIG_USE_TIMER0
+
+#if defined(CONFIG_USE_TIMER0)
+#define TIMCTRL		TIMCTRL0
+#define TIMCOUNT	TIMCOUNT0
+#elif defined(CONFIG_USE_TIMER1)
+#define TIMCTRL		TIMCTRL1
+#define TIMCOUNT	TIMCOUNT1
+#elif defined(CONFIG_USE_TIMER2)
+#define TIMCTRL		TIMCTRL2
+#define TIMCOUNT	TIMCOUNT2
+#elif defined(CONFIG_USE_TIMER3)
+#define TIMCTRL		TIMCTRL3
+#define TIMCOUNT	TIMCOUNT3
+#else
+#error "Define which STMP378x timer to use"
+#endif
+
+#define TIMER_LOAD_VAL 0x0000ffff
+
+/* macro to read the 16 bit timer */
+#define READ_TIMER ((REG_RD(TIMROT_BASE + TIMCOUNT) & 0xffff0000) >> 16)
+
+static ulong timestamp;
+static ulong lastdec;
+
+int timer_init(void)
+{
+	u32 val;
+
+	/*
+	 * Reset Timers and Rotary Encoder module
+	 */
+
+	/* Clear SFTRST */
+	REG_CLR(TIMROT_BASE + ROTCTRL, 1 << 31);
+	while (REG_RD(TIMROT_BASE + ROTCTRL) & (1 << 31))
+		;
+
+	/* Clear CLKGATE */
+	REG_CLR(TIMROT_BASE + ROTCTRL, 1 << 30);
+
+	/* Set SFTRST and wait until CLKGATE is set */
+	REG_SET(TIMROT_BASE + ROTCTRL, 1 << 31);
+	while (!(REG_RD(TIMROT_BASE + ROTCTRL) & (1 << 30)))
+		;
+
+	/* Clear SFTRST and CLKGATE */
+	REG_CLR(TIMROT_BASE + ROTCTRL, 1 << 31);
+	REG_CLR(TIMROT_BASE + ROTCTRL, 1 << 30);
+
+	/*
+	* Now initialize timer
+	*/
+
+	/* Set fixed_count to 0 */
+	REG_WR(TIMROT_BASE + TIMCOUNT, 0);
+
+	/* set UPDATE bit and 1Khz frequency */
+	REG_WR(TIMROT_BASE + TIMCTRL,
+	       TIMCTRL_RELOAD | TIMCTRL_UPDATE | TIMCTRL_SELECT_1KHZ);
+
+	/* Set fixed_count to maximal value */
+	REG_WR(TIMROT_BASE + TIMCOUNT, TIMER_LOAD_VAL);
+
+	/* init the timestamp and lastdec value */
+	reset_timer_masked();
+
+	return 0;
+}
+
+/*
+ * timer without interrupts
+ */
+
+void reset_timer(void)
+{
+	reset_timer_masked();
+}
+
+ulong get_timer(ulong base)
+{
+	return get_timer_masked() - base;
+}
+
+void set_timer(ulong t)
+{
+	timestamp = t;
+}
+
+/* delay x useconds AND perserve advance timstamp value */
+void udelay(unsigned long usec)
+{
+	ulong tmo, tmp;
+
+	if (usec >= 1000) {
+		/* if "big" number, spread normalization to seconds */
+		tmo = usec / 1000;
+		/* start to normalize for usec to ticks per sec */
+		tmo *= CONFIG_SYS_HZ;
+		/* find number of "ticks" to wait to achieve target */
+		tmo /= 1000;
+		/* finish normalize. */
+	} else {
+		/* else small number, don't kill it prior to HZ multiply */
+		tmo = usec * CONFIG_SYS_HZ;
+		tmo /= (1000*1000);
+	}
+
+	tmp = get_timer(0);
+		/* get current timestamp */
+	if ((tmo + tmp + 1) < tmp)
+		/* if setting this fordward will roll time stamp */
+		reset_timer_masked();
+		/* reset "advancing" timestamp to 0, set lastdec value */
+	else
+		tmo += tmp;
+		/* else, set advancing stamp wake up time */
+
+	while (get_timer_masked() < tmo)/* loop till event */
+		/*NOP*/;
+}
+
+void reset_timer_masked(void)
+{
+	/* reset time */
+	lastdec = READ_TIMER;  /* capure current decrementer value time */
+	timestamp = 0;	       /* start "advancing" time stamp from 0 */
+}
+
+ulong get_timer_masked(void)
+{
+	ulong now = READ_TIMER;		/* current tick value */
+
+	if (lastdec >= now) {		/* normal mode (non roll) */
+		/* normal mode */
+		timestamp += lastdec - now;
+		/* move stamp fordward with absoulte diff ticks */
+	} else {
+		/* we have overflow of the count down timer */
+		/* nts = ts + ld + (TLV - now)
+		 * ts=old stamp, ld=time that passed before passing through -1
+		 * (TLV-now) amount of time after passing though -1
+		 * nts = new "advancing time stamp"...it could also roll
+		 * and cause problems.
+		 */
+		timestamp += lastdec + TIMER_LOAD_VAL - now + 1;
+	}
+	lastdec = now;
+
+	return timestamp;
+}
+
+/* waits specified delay value and resets timestamp */
+void udelay_masked(unsigned long usec)
+{
+	ulong tmo;
+	ulong endtime;
+	signed long diff;
+
+	if (usec >= 1000) {
+		/* if "big" number, spread normalization to seconds */
+		tmo = usec / 1000;
+		/* start to normalize for usec to ticks per sec */
+		tmo *= CONFIG_SYS_HZ;
+		/* find number of "ticks" to wait to achieve target */
+		tmo /= 1000;
+		/* finish normalize. */
+	} else {
+		/* else small number, don't kill it prior to HZ multiply */
+		tmo = usec * CONFIG_SYS_HZ;
+		tmo /= (1000*1000);
+	}
+
+	endtime = get_timer_masked() + tmo;
+
+	do {
+		ulong now = get_timer_masked();
+		diff = endtime - now;
+	} while (diff >= 0);
+}
+
+/*
+ * This function is derived from PowerPC code (read timebase as long long).
+ * On ARM it just returns the timer value.
+ */
+unsigned long long get_ticks(void)
+{
+	return get_timer(0);
+}
+
+/*
+ * This function is derived from PowerPC code (timebase clock frequency).
+ * On ARM it returns the number of timer ticks per second.
+ */
+ulong get_tbclk(void)
+{
+	ulong tbclk;
+
+	tbclk = CONFIG_SYS_HZ;
+	return tbclk;
+}