1 files changed, 334 insertions, 0 deletions
diff --git a/sys/powerpc/amigaone/cpld_x5000.c b/sys/powerpc/amigaone/cpld_x5000.c
new file mode 100644
index 000000000000..cf4a4680c6d5
--- /dev/null
+++ b/sys/powerpc/amigaone/cpld_x5000.c
@@ -0,0 +1,334 @@
+/*-
+ * Copyright (c) 2020 Justin Hibbits
+ *
+ * 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 THE AUTHOR ``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 THE AUTHOR 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/param.h>
+#include <sys/systm.h>
+#include <sys/conf.h>
+#include <sys/kernel.h>
+#include <sys/bus.h>
+#include <sys/limits.h>
+#include <sys/module.h>
+#include <sys/malloc.h>
+#include <sys/mutex.h>
+#include <sys/rman.h>
+#include <sys/sysctl.h>
+
+#include <machine/bus.h>
+
+#include <dev/ofw/ofw_bus.h>
+#include <dev/ofw/ofw_bus_subr.h>
+
+#include "cpld.h"
+
+/*
+ * A driver for the AmigaOne X5000 "Cyrus+" CPLD.
+ *
+ * This is the interface between the CPU and the "Xena" (XMOS) chip.  Since the
+ * XMOS is programmable via a SPI-attached flash memory, there's no direct
+ * driver written for the Xena attachment.  Instead, a userspace process would
+ * communicate with the Xena by issuing ioctl()s to this CPLD.
+ */
+
+/* Resource access addresses. */
+#define	CPLD_MEM_ADDR		0x0000
+#define	CPLD_MEM_DATA		0x8000
+
+#define	CPLD_MAX_DRAM_WORDS	0x800
+
+/* CPLD Registers. */
+#define	CPLD_REG_SIG1		0x00
+#define	CPLD_REG_SIG2		0x01
+#define	CPLD_REG_HWREV		0x02
+#define	CPLD_REG_MBC2X		0x05
+#define	CPLD_REG_MBX2C		0x06
+#define	CPLD_REG_XDEBUG		0x0c
+#define	CPLD_REG_XJTAG		0x0d
+#define	CPLD_REG_FAN_TACHO	0x10
+#define	CPLD_REG_DATE_LW	0x21
+#define	CPLD_REG_DATE_UW	0x22
+#define	CPLD_REG_TIME_LW	0x23
+#define	CPLD_REG_TIME_UW	0x24
+#define	CPLD_REG_SCR1		0x30
+#define	CPLD_REG_SCR2		0x31
+#define	CPLD_REG_RAM		0x8000
+
+struct cpld_softc {
+	device_t	 sc_dev;
+	struct resource	*sc_mem;
+	struct cdev	*sc_cdev;
+	struct mtx	 sc_mutex;
+	bool		 sc_isopen;
+};
+
+static d_open_t		cpld_open;
+static d_close_t	cpld_close;
+static d_ioctl_t	cpld_ioctl;
+
+static struct cdevsw cpld_cdevsw = {
+	.d_version =	D_VERSION,
+	.d_open =	cpld_open,
+	.d_close =	cpld_close,
+	.d_ioctl =	cpld_ioctl,
+	.d_name =	"nvram",
+};
+
+static device_probe_t	cpld_probe;
+static device_attach_t	cpld_attach;
+static int		cpld_fan_sysctl(SYSCTL_HANDLER_ARGS);
+
+static device_method_t cpld_methods[] = {
+	DEVMETHOD(device_probe,		cpld_probe),
+	DEVMETHOD(device_attach,	cpld_attach),
+
+	DEVMETHOD_END
+};
+
+static driver_t cpld_driver = {
+	"cpld",
+	cpld_methods,
+	sizeof(struct cpld_softc)
+};
+
+DRIVER_MODULE(cpld, lbc, cpld_driver, 0, 0);
+
+static void
+cpld_write(struct cpld_softc *sc, int addr, int data)
+{
+	bus_write_2(sc->sc_mem, CPLD_MEM_ADDR, addr);
+	bus_write_2(sc->sc_mem, CPLD_MEM_DATA, data);
+}
+
+static int
+cpld_read(struct cpld_softc *sc, int addr)
+{
+	bus_write_2(sc->sc_mem, CPLD_MEM_ADDR, addr);
+
+	return (bus_read_2(sc->sc_mem, CPLD_MEM_DATA));
+}
+
+static int
+cpld_probe(device_t dev)
+{
+	if (!ofw_bus_is_compatible(dev, "aeon,cyrus-cpld"))
+		return (ENXIO);
+
+	device_set_desc(dev, "AmigaOne Cyrus CPLD");
+
+	return (BUS_PROBE_GENERIC);
+}
+
+static int
+cpld_attach(device_t dev)
+{
+	struct make_dev_args mda;
+	struct cpld_softc *sc;
+	int rid;
+	int date, time, tmp;
+	int err;
+	struct sysctl_ctx_list *ctx;
+	struct sysctl_oid *tree;
+
+	sc = device_get_softc(dev);
+	sc->sc_dev = dev;
+
+	rid = 0;
+	sc->sc_mem = bus_alloc_resource_any(dev, SYS_RES_MEMORY, &rid,
+	    RF_ACTIVE|RF_SHAREABLE);
+	if (sc->sc_mem == NULL) {
+		device_printf(dev, "Unable to allocate memory resource.\n");
+		return (ENXIO);
+	}
+	mtx_init(&sc->sc_mutex, "cpld", NULL, MTX_DEF);
+	if (bootverbose) {
+		date = (cpld_read(sc, CPLD_REG_DATE_UW) << 16) |
+		    cpld_read(sc, CPLD_REG_DATE_LW);
+		time = (cpld_read(sc, CPLD_REG_TIME_UW) << 16) |
+		    cpld_read(sc, CPLD_REG_TIME_LW);
+
+		device_printf(dev, "Build date: %04x-%02x-%02x\n",
+		    (date >> 16) & 0xffff, (date >> 8) & 0xff, date & 0xff);
+		device_printf(dev, "Build time: %02x:%02x:%02x\n",
+		    (time >> 16) & 0xff, (time >> 8) & 0xff, time & 0xff);
+	}
+
+	tmp = cpld_read(sc, CPLD_REG_HWREV);
+	device_printf(dev, "Hardware revision: %d\n", tmp);
+
+	ctx = device_get_sysctl_ctx(dev);
+	tree = device_get_sysctl_tree(dev);
+
+	SYSCTL_ADD_PROC(ctx, SYSCTL_CHILDREN(tree), OID_AUTO,
+	    "cpu_fan", CTLTYPE_INT | CTLFLAG_RD | CTLFLAG_MPSAFE, sc, 0,
+	    cpld_fan_sysctl, "I", "CPU Fan speed in RPM");
+
+	make_dev_args_init(&mda);
+	mda.mda_flags =  MAKEDEV_CHECKNAME;
+	mda.mda_devsw = &cpld_cdevsw;
+	mda.mda_uid = UID_ROOT;
+	mda.mda_gid = GID_WHEEL;
+	mda.mda_mode = 0660;
+	mda.mda_si_drv1 = sc;
+	err = make_dev_s(&mda, &sc->sc_cdev, "cpld");
+	if (err != 0) {
+		device_printf(dev, "Error creating character device: %d\n", err);
+		device_printf(dev, "Only sysctl interfaces will be available.\n");
+	}
+
+	return (0);
+}
+
+static int
+cpld_fan_sysctl(SYSCTL_HANDLER_ARGS)
+{
+	struct cpld_softc *sc;
+	int error, old, rpm;
+
+	sc = arg1;
+	mtx_lock(&sc->sc_mutex);
+	/* Read until we get some level of read stability. */
+	rpm = cpld_read(sc, CPLD_REG_FAN_TACHO);
+	do {
+		old = rpm;
+		rpm = cpld_read(sc, CPLD_REG_FAN_TACHO);
+	} while (abs(rpm - old) > 10);
+	mtx_unlock(&sc->sc_mutex);
+
+	/* Convert RPS->RPM. */
+	rpm *= 60;
+	error = sysctl_handle_int(oidp, &rpm, 0, req);
+
+	return (error);
+}
+
+static int
+cpld_open(struct cdev *dev, int flags, int fmt, struct thread *td)
+{
+	struct cpld_softc *sc = dev->si_drv1;
+
+	if (sc->sc_isopen)
+		return (EBUSY);
+	sc->sc_isopen = 1;
+	return (0);
+}
+
+static int
+cpld_close(struct cdev *dev, int fflag, int devtype, struct thread *td)
+{
+	struct cpld_softc *sc = dev->si_drv1;
+
+	sc->sc_isopen = 0;
+	return (0);
+}
+
+static int
+cpld_send(device_t dev, struct cpld_cmd_data *d)
+{
+	struct cpld_softc *sc;
+	uint16_t *word;
+	int i;
+
+	if (d->cmd > USHRT_MAX)
+		return (EINVAL);
+
+	sc = device_get_softc(dev);
+
+	mtx_lock(&sc->sc_mutex);
+	for (i = 0, word = d->words; i < d->len; i++, word++) {
+		if (i == 0)
+			cpld_write(sc, CPLD_REG_RAM, *word);
+		else
+			bus_write_4(sc->sc_mem, CPLD_MEM_DATA, *word);
+	}
+
+	cpld_write(sc, CPLD_REG_MBC2X, d->cmd);
+	mtx_unlock(&sc->sc_mutex);
+
+	return (0);
+}
+
+static int
+cpld_recv(device_t dev, struct cpld_cmd_data *d)
+{
+	struct cpld_softc *sc;
+	uint16_t *word;
+	int i;
+
+	sc = device_get_softc(dev);
+
+	mtx_lock(&sc->sc_mutex);
+	d->cmd = cpld_read(sc, CPLD_REG_MBX2C);
+
+	for (i = 0, word = d->words; i < d->len; i++, word++) {
+		if (i == 0)
+			*word = cpld_read(sc, CPLD_REG_RAM);
+		else
+			*word = bus_read_4(sc->sc_mem, CPLD_MEM_DATA);
+	}
+	mtx_unlock(&sc->sc_mutex);
+
+	return (0);
+}
+
+static int
+cpld_ioctl(struct cdev *dev, u_long cmd, caddr_t data, int fflag, struct thread *td)
+{
+	struct cpld_softc *sc;
+	struct cpld_cmd_data *d;
+	void *xfer_data, *tmp;
+	int err;
+
+	sc = dev->si_drv1;
+
+	err = 0;
+	d = (struct cpld_cmd_data *)data;
+	if (d->len + d->offset > CPLD_MAX_DRAM_WORDS) {
+		return (EINVAL);
+	}
+	xfer_data = malloc(d->len * sizeof(uint16_t), M_TEMP, M_WAITOK);
+
+	switch (cmd) {
+	case IOCCPLDSEND:
+		err = copyin(d->words, xfer_data, d->len * sizeof(uint16_t));
+		d->words = xfer_data;
+		if (err == 0)
+			err = cpld_send(sc->sc_dev, d);
+		break;
+	case IOCCPLDRECV:
+		tmp = d->words;
+		d->words = xfer_data;
+		err = cpld_recv(sc->sc_dev, d);
+		d->words = tmp;
+		if (err == 0)
+			err = copyout(xfer_data, d->words,
+			    d->len * sizeof(uint16_t));
+		break;
+	default:
+		err = ENOTTY;
+		break;
+	}
+	free(xfer_data, M_TEMP);
+
+	return (err);
+}