gscpm(4) -- National Semiconductor Geode SC1100 SMI/ACPI module driver.

Provides a timecounter for kern_tc. There's also code for cpu throttling tho
it's not tested due to the hardware errata.

ok deraadt@

3 files changed, 236 insertions, 1 deletions

diff --git a/sys/arch/i386/conf/files.i386 b/sys/arch/i386/conf/files.i386
index 2009ce890b3..0481c851ddb 100644
--- a/sys/arch/i386/conf/files.i386
+++ b/sys/arch/i386/conf/files.i386
@@ -1,4 +1,4 @@
-#	$OpenBSD: files.i386,v 1.126 2004/07/14 05:34:14 tedu Exp $
+#	$OpenBSD: files.i386,v 1.127 2004/09/15 20:28:53 grange Exp $
 #
 # new style config file for i386 architecture
 #
@@ -123,6 +123,11 @@ device	geodesc
 attach	geodesc at pci
 file	arch/i386/pci/geodesc.c		geodesc
 
+# National Semiconductor Geode SC1100 SMI/ACPI module
+device	gscpm
+attach	gscpm at pci
+file	arch/i386/pci/gscpm.c		gscpm
+
 # PCI-ISA bridge chipsets
 device	pcib: isabus
 attach	pcib at pci
diff --git a/sys/arch/i386/pci/gscpm.c b/sys/arch/i386/pci/gscpm.c
new file mode 100644
index 00000000000..4156dbfbc95
--- /dev/null
+++ b/sys/arch/i386/pci/gscpm.c
@@ -0,0 +1,179 @@
+/*	$OpenBSD: gscpm.c,v 1.1 2004/09/15 20:28:53 grange Exp $	*/
+/*
+ * Copyright (c) 2004 Alexander Yurchenko <grange@openbsd.org>
+ *
+ * Permission to use, copy, modify, and distribute this software for any
+ * purpose with or without fee is hereby granted, provided that the above
+ * copyright notice and this permission notice appear in all copies.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+ * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
+ * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+ * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
+ * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
+ * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+ */
+
+/*
+ * National Semiconductor Geode SC1100 SMI/ACPI module.
+ */
+
+#include <sys/param.h>
+#include <sys/systm.h>
+#include <sys/device.h>
+#include <sys/kernel.h>
+#include <sys/sysctl.h>
+#ifdef __HAVE_TIMECOUNTER
+#include <sys/timetc.h>
+#endif
+
+#include <machine/bus.h>
+
+#include <dev/pci/pcidevs.h>
+#include <dev/pci/pcireg.h>
+#include <dev/pci/pcivar.h>
+
+#include <i386/pci/gscpmreg.h>
+
+struct gscpm_softc {
+	struct device sc_dev;
+
+	pci_chipset_tag_t sc_pc;
+	pcitag_t sc_tag;
+	bus_space_tag_t sc_iot;
+	bus_space_handle_t sc_acpi_ioh;
+};
+
+int	gscpm_match(struct device *, void *, void *);
+void	gscpm_attach(struct device *, struct device *, void *);
+
+int	gscpm_setperf(int);
+
+#ifdef __HAVE_TIMECOUNTER
+u_int	gscpm_get_timecount(struct timecounter *tc);
+
+struct timecounter gscpm_timecounter = {
+	gscpm_get_timecount,	/* get_timecount */
+	0,			/* no poll_pps */
+	0xffffff,		/* counter_mask */
+	14318180 / 4,		/* frequency */
+	"Geode SC1100",		/* name */
+	1000			/* quality */
+};
+#endif	/* __HAVE_TIMECOUNTER */
+
+struct cfattach gscpm_ca = {
+	sizeof (struct gscpm_softc),
+	gscpm_match,
+	gscpm_attach
+};
+
+struct cfdriver gscpm_cd = {
+	NULL, "gscpm", DV_DULL
+};
+
+#if 0
+static void *gscpm_cookie;	/* XXX */
+#endif
+
+int
+gscpm_match(struct device *parent, void *match, void *aux)
+{
+	struct pci_attach_args *pa = aux;
+
+	if (PCI_VENDOR(pa->pa_id) == PCI_VENDOR_NS &&
+	    PCI_PRODUCT(pa->pa_id) == PCI_PRODUCT_NS_SC1100_SMI)
+		return (1);
+
+	return (0);
+}
+
+void
+gscpm_attach(struct device *parent, struct device *self, void *aux)
+{
+	struct gscpm_softc *sc = (struct gscpm_softc *)self;
+	struct pci_attach_args *pa = aux;
+	pcireg_t csr, acpibase;
+
+	sc->sc_pc = pa->pa_pc;
+	sc->sc_tag = pa->pa_tag;
+	sc->sc_iot = pa->pa_iot;
+
+	/* Enable I/O space */
+	csr = pci_conf_read(sc->sc_pc, sc->sc_tag, PCI_COMMAND_STATUS_REG);
+	pci_conf_write(sc->sc_pc, sc->sc_tag, PCI_COMMAND_STATUS_REG,
+	    csr | PCI_COMMAND_IO_ENABLE);
+
+	/* Map ACPI registers */
+	acpibase = pci_conf_read(sc->sc_pc, sc->sc_tag, GSCPM_ACPIBASE);
+	if (bus_space_map(sc->sc_iot, PCI_MAPREG_IO_ADDR(acpibase),
+	    GSCPM_ACPISIZE, 0, &sc->sc_acpi_ioh)) {
+		printf(": failed to map ACPI registers\n");
+		return;
+	}
+
+	printf("\n");
+
+#ifdef __HAVE_TIMECOUNTER
+	/* Hook into the kern_tc */
+	gscpm_timecounter.tc_priv = sc;
+	tc_init(&gscpm_timecounter);
+#endif	/* __HAVE_TIMECOUNTER */
+
+/* XXX: disabled due to unresolved yet hardware errata */
+#if 0
+	/* Hook into the hw.setperf sysctl */
+	gscpm_cookie = sc;
+	cpu_setperf = gscpm_setperf;
+#endif
+
+}
+
+#ifdef __HAVE_TIMECOUNTER
+u_int
+gscpm_get_timecount(struct timecounter *tc)
+{
+	struct gscpm_softc *sc = tc->tc_priv;
+	u_int u1, u2, u3;
+
+	u2 = bus_space_read_4(sc->sc_iot, sc->sc_acpi_ioh, GSCPM_PM_TMR);
+	u3 = bus_space_read_4(sc->sc_iot, sc->sc_acpi_ioh, GSCPM_PM_TMR);
+	do {
+		u1 = u2;
+		u2 = u3;
+		u3 = bus_space_read_4(sc->sc_iot, sc->sc_acpi_ioh,
+		    GSCPM_PM_TMR);
+	} while (u1 > u2 || u2 > u3);
+
+	return (u2);
+}
+#endif	/* __HAVE_TIMECOUNTER */
+
+#if 0
+int
+gscpm_setperf(int level)
+{
+	struct gscpm_softc *sc = gscpm_cookie;
+	int i;
+	u_int32_t pctl;
+
+	pctl = bus_space_read_4(sc->sc_iot, sc->sc_acpi_ioh, GSCPM_P_CNT);
+
+	if (level == 100) {
+		/* 100 is a maximum perfomance, disable throttling */
+		pctl &= ~GSCPM_P_CNT_THTEN;
+	} else {
+		for (i = 0; i < GSCPM_THT_LEVELS; i++)
+			if (level >= gscpm_tht[i].level)
+				break;
+		pctl = (0xf0 | GSCPM_P_CNT_THTEN |
+		    GSCPM_P_CNT_CLK(gscpm_tht[i].value));
+	}
+
+	/* Update processor control register */
+	bus_space_write_4(sc->sc_iot, sc->sc_acpi_ioh, GSCPM_P_CNT, pctl);
+
+	return (0);
+}
+#endif
diff --git a/sys/arch/i386/pci/gscpmreg.h b/sys/arch/i386/pci/gscpmreg.h
new file mode 100644
index 00000000000..4ee9b1a1b7d
--- /dev/null
+++ b/sys/arch/i386/pci/gscpmreg.h
@@ -0,0 +1,51 @@
+/*	$OpenBSD: gscpmreg.h,v 1.1 2004/09/15 20:28:53 grange Exp $	*/
+/*
+ * Copyright (c) 2004 Alexander Yurchenko <grange@openbsd.org>
+ *
+ * Permission to use, copy, modify, and distribute this software for any
+ * purpose with or without fee is hereby granted, provided that the above
+ * copyright notice and this permission notice appear in all copies.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+ * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
+ * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+ * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
+ * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
+ * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+ */
+
+#ifndef _DEV_PCI_GSCPMREG_H_
+#define _DEV_PCI_GSCPMREG_H_
+
+/*
+ * National Semiconductor Geode SC1100 SMI/ACPI module register definitions.
+ */
+
+/* PCI configuration space */
+#define GSCPM_ACPIBASE		0x40	/* ACPI I/O space base address */
+#define GSCPM_ACPISIZE		256	/* ACPI I/O space size */
+
+/* ACPI I/O space */
+#define GSCPM_P_CNT		0x00	/* processor control */
+#define		GSCPM_P_CNT_CLK(val)	((val) & 0x7)
+#define		GSCPM_P_CNT_THTEN	(1 << 4)  /* throttle enable */
+#define GSCPM_PM_TMR		0x1c	/* PM timer */
+
+/* CPU throttling values */
+static const struct {
+	int level;
+	int value;
+} gscpm_tht[] = {
+	{ 88, 1 },
+	{ 75, 2 },
+	{ 63, 3 },
+	{ 50, 4 },
+	{ 38, 5 },
+	{ 25, 6 },
+	{ 13, 7 }
+};
+
+#define GSCPM_THT_LEVELS (sizeof(gscpm_tht) / sizeof(gscpm_tht[0]))
+
+#endif	/* !_DEV_PCI_GSCPMREG_H_ */