Import preliminary support for Atmel AT91SAM9G20 cpu, and the Hot-e HL201.

This fine work was done by Yohanes Nugroho <yohanes a gmail dot com>
Many thanks to John Nicholls and Thinlinx for providing sample hardware.

1 files changed, 233 insertions, 0 deletions

diff --git a/sys/arm/at91/at91_pit.c b/sys/arm/at91/at91_pit.c
new file mode 100644
index 0000000..516b4d4
--- /dev/null
+++ b/sys/arm/at91/at91_pit.c
@@ -0,0 +1,233 @@
+/*-
+ * Copyright (c) 2010 Yohanes Nugroho.  All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY AUTHOR AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED.  IN NO EVENT SHALL AUTHOR OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ */
+
+#include <sys/cdefs.h>
+
+#include <sys/param.h>
+#include <sys/systm.h>
+#include <sys/kernel.h>
+#include <sys/module.h>
+#include <sys/time.h>
+#include <sys/bus.h>
+#include <sys/resource.h>
+#include <sys/timetc.h>
+#include <sys/watchdog.h>
+
+#include <machine/bus.h>
+#include <machine/cpu.h>
+#include <machine/cpufunc.h>
+#include <machine/resource.h>
+#include <machine/frame.h>
+#include <machine/intr.h>
+
+#include <arm/at91/at91var.h>
+#include <arm/at91/at91_pitreg.h>
+#include <arm/at91/at91_pmcvar.h>
+#include <arm/at91/at91sam9g20reg.h>
+
+__FBSDID("$FreeBSD$");
+
+static struct at91pit_softc {
+	bus_space_tag_t		sc_st;
+	bus_space_handle_t	sc_sh;
+	device_t		sc_dev;
+} *pit_softc;
+
+#define RD4(off) \
+	bus_space_read_4(pit_softc->sc_st, pit_softc->sc_sh, (off))
+#define WR4(off, val) \
+	bus_space_write_4(pit_softc->sc_st, pit_softc->sc_sh, (off), (val))
+
+static unsigned at91pit_get_timecount(struct timecounter *tc);
+static int clock_intr(void *arg);
+
+static struct timecounter at91pit_timecounter = {
+	at91pit_get_timecount, /* get_timecount */
+	NULL, /* no poll_pps */
+	0xffffffffu, /* counter mask */
+	0, /* frequency */
+	"AT91SAM9261 timer", /* name */
+	1000 /* quality */
+};
+
+
+uint32_t 
+at91_pit_base(void);
+
+uint32_t
+at91_pit_size(void);
+
+static int
+at91pit_probe(device_t dev)
+{
+	device_set_desc(dev, "PIT");
+	return (0);
+}
+
+uint32_t 
+at91_pit_base(void)
+{
+	return (AT91SAM9G20_PIT_BASE);
+}
+
+uint32_t
+at91_pit_size(void)
+{
+	return (AT91SAM9G20_PIT_SIZE);
+}
+
+static int pit_rate;
+static int pit_cycle;
+static int pit_counter;
+
+static int
+at91pit_attach(device_t dev)
+{
+	struct at91_softc *sc = device_get_softc(device_get_parent(dev));
+	struct resource *irq;
+	int rid = 0;
+	void *ih;
+
+	pit_softc = device_get_softc(dev);
+	pit_softc->sc_st = sc->sc_st;
+	pit_softc->sc_dev = dev;
+	if (bus_space_subregion(sc->sc_st, sc->sc_sh, at91_pit_base(),
+	    at91_pit_size(), &pit_softc->sc_sh) != 0)
+	       panic("couldn't subregion pit registers");
+
+	irq = bus_alloc_resource(dev, SYS_RES_IRQ, &rid, 1, 1, 1,
+	  RF_ACTIVE | RF_SHAREABLE);
+	if (!irq)
+		panic("Unable to allocate IRQ for the system timer");
+	else
+		bus_setup_intr(dev, irq, INTR_TYPE_CLK,
+			clock_intr, NULL, NULL, &ih);
+       
+
+	device_printf(dev, "AT91SAM9x pit registered\n");
+	return (0);
+}
+
+static device_method_t at91pit_methods[] = {
+	DEVMETHOD(device_probe, at91pit_probe),
+	DEVMETHOD(device_attach, at91pit_attach),
+	{0,0},
+};
+
+static driver_t at91pit_driver = {
+	"at91_pit",
+	at91pit_methods,
+	sizeof(struct at91pit_softc),
+};
+
+static devclass_t at91pit_devclass;
+
+DRIVER_MODULE(at91_pit, atmelarm, at91pit_driver, at91pit_devclass, 0, 0);
+
+static int
+clock_intr(void *arg)
+{
+
+	struct trapframe *fp = arg;
+
+	if (RD4(PIT_SR) & PIT_PITS_DONE) {
+		uint32_t pivr = RD4(PIT_PIVR);
+		if (PIT_CNT(pivr)>1) {
+			printf("cnt = %d\n", PIT_CNT(pivr));
+		}
+		pit_counter += pit_cycle;
+		hardclock(TRAPF_USERMODE(fp), TRAPF_PC(fp));
+		return (FILTER_HANDLED);
+	}
+	return (FILTER_STRAY);
+}
+
+static unsigned 
+at91pit_get_timecount(struct timecounter *tc)
+{
+	return pit_counter;
+}
+
+/*todo: review this*/
+void
+DELAY(int n)
+{
+	u_int32_t start, end, cur;
+
+	start = RD4(PIT_PIIR);
+	n = (n * 1000) / (at91_master_clock / 12);
+	if (n <= 0)
+		n = 1;
+	end = (start + n);
+	cur = start;
+	if (start > end) {
+		while (cur >= start || cur < end)
+			cur = RD4(PIT_PIIR);
+	} else {
+		while (cur < end)
+			cur = RD4(PIT_PIIR);
+	}
+}
+
+/*
+ * The 3 next functions must be implement with the futur PLL code.
+ */
+void
+cpu_startprofclock(void)
+{
+}
+
+void
+cpu_stopprofclock(void)
+{
+}
+
+#define HZ 100
+
+void
+cpu_initclocks(void)
+{
+	struct at91_pmc_clock *master;
+
+	master = at91_pmc_clock_ref("mck");
+	pit_rate =  master->hz / 16;
+	pit_cycle = (pit_rate + HZ/2) / HZ;	
+	at91pit_timecounter.tc_frequency = pit_rate;
+	WR4(PIT_MR, 0);
+
+	while (PIT_PIV(RD4(PIT_PIVR)) != 0);
+		
+	WR4(PIT_MR, (pit_cycle - 1) | PIT_IEN | PIT_EN);
+	tc_init(&at91pit_timecounter);
+}
+
+void
+cpu_reset(void)
+{
+	*(volatile int *)(AT91SAM9G20_BASE + AT91SAM9G20_RSTC_BASE +
+	    RSTC_CR) = RSTC_PROCRST | RSTC_PERRST | RSTC_KEY;
+	while (1)
+		continue;
+}