From 14df39ad40a9a6177c6acca023a4ab03a6276e00 Mon Sep 17 00:00:00 2001
From: Andrew Turner <andrew@FreeBSD.org>
Date: Thu, 3 Dec 2015 11:24:11 +0000
Subject: [PATCH] Add support for a generic AHCI attachment. This allows us to
 attach to a typically memory mapped bus, for example on the AMD Opteron A1100
 the AHCI device is mapped in the CPUs address space, and not through a PCI
 controller.

Further work is needed for this to work with ACPI as this is expected to be
common on ARMv8 servers.

Reviewed by:	mav, mmel
Obtained from:	mmel, ABT Systems Ltd
Relnotes:	yes
Sponsored by:	SoftIron Inc
Differential Revision:	https://reviews.freebsd.org/D4269
---
 sys/conf/files.arm64        |   1 +
 sys/dev/ahci/ahci_generic.c | 131 ++++++++++++++++++++++++++++++++++++
 2 files changed, 132 insertions(+)
 create mode 100644 sys/dev/ahci/ahci_generic.c

diff --git a/sys/conf/files.arm64 b/sys/conf/files.arm64
index 303b084150b6..7c8c4f783d2a 100644
--- a/sys/conf/files.arm64
+++ b/sys/conf/files.arm64
@@ -57,6 +57,7 @@ arm64/cloudabi64/cloudabi64_sysvec.c	optional compat_cloudabi64
 crypto/blowfish/bf_enc.c	optional	crypto | ipsec
 crypto/des/des_enc.c		optional	crypto | ipsec | netsmb
 dev/acpica/acpi_if.m		optional	acpi
+dev/ahci/ahci_generic.c		optional ahci fdt
 dev/fdt/fdt_arm64.c		optional	fdt
 dev/hwpmc/hwpmc_arm64.c		optional	hwpmc
 dev/hwpmc/hwpmc_arm64_md.c	optional	hwpmc
diff --git a/sys/dev/ahci/ahci_generic.c b/sys/dev/ahci/ahci_generic.c
new file mode 100644
index 000000000000..80f7fedee049
--- /dev/null
+++ b/sys/dev/ahci/ahci_generic.c
@@ -0,0 +1,131 @@
+/*-
+ * Copyright (c) 2009-2012 Alexander Motin <mav@FreeBSD.org>
+ * 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,
+ *    without modification, immediately at the beginning of the file.
+ * 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/cdefs.h>
+__FBSDID("$FreeBSD$");
+
+#include <sys/param.h>
+#include <sys/module.h>
+#include <sys/systm.h>
+#include <sys/kernel.h>
+#include <sys/bus.h>
+#include <sys/conf.h>
+#include <sys/endian.h>
+#include <sys/malloc.h>
+#include <sys/lock.h>
+#include <sys/mutex.h>
+#include <sys/rman.h>
+
+#include <machine/bus.h>
+#include <machine/resource.h>
+
+#include <dev/ahci/ahci.h>
+
+#include <dev/ofw/ofw_bus.h>
+#include <dev/ofw/ofw_bus_subr.h>
+
+static struct ofw_compat_data compat_data[] = {
+	{"generic-ahci", 	1},
+	{"snps,dwc-ahci",	1},
+	{NULL,			0}
+};
+
+static int
+ahci_gen_ctlr_reset(device_t dev)
+{
+
+	return ahci_ctlr_reset(dev);
+}
+
+static int
+ahci_probe(device_t dev)
+{
+
+	if (!ofw_bus_status_okay(dev))
+		return (ENXIO);
+
+	if (!ofw_bus_search_compatible(dev, compat_data)->ocd_data)
+		return (ENXIO);
+
+	device_set_desc_copy(dev, "AHCI SATA controller");
+	return (BUS_PROBE_DEFAULT);
+}
+
+static int
+ahci_gen_attach(device_t dev)
+{
+	struct ahci_controller *ctlr = device_get_softc(dev);
+	int	error;
+
+	ctlr->r_rid = 0;
+	ctlr->r_mem = bus_alloc_resource_any(dev, SYS_RES_MEMORY, &ctlr->r_rid,
+	    RF_ACTIVE);
+	if (ctlr->r_mem == NULL)
+		return (ENXIO);
+
+	/* Setup controller defaults. */
+	ctlr->numirqs = 1;
+
+	/* Reset controller */
+	if ((error = ahci_gen_ctlr_reset(dev)) == 0)
+		error = ahci_attach(dev);
+
+	if (error != 0) {
+		if (ctlr->r_mem != NULL)
+			bus_release_resource(dev, SYS_RES_MEMORY, ctlr->r_rid,
+			    ctlr->r_mem);
+	}
+	return error;
+}
+
+static int
+ahci_gen_detach(device_t dev)
+{
+
+	ahci_detach(dev);
+	return (0);
+}
+
+static devclass_t ahci_gen_devclass;
+static device_method_t ahci_methods[] = {
+	DEVMETHOD(device_probe,     ahci_probe),
+	DEVMETHOD(device_attach,    ahci_gen_attach),
+	DEVMETHOD(device_detach,    ahci_gen_detach),
+	DEVMETHOD(bus_print_child,  ahci_print_child),
+	DEVMETHOD(bus_alloc_resource,       ahci_alloc_resource),
+	DEVMETHOD(bus_release_resource,     ahci_release_resource),
+	DEVMETHOD(bus_setup_intr,   ahci_setup_intr),
+	DEVMETHOD(bus_teardown_intr,ahci_teardown_intr),
+	DEVMETHOD(bus_child_location_str, ahci_child_location_str),
+	DEVMETHOD(bus_get_dma_tag,  ahci_get_dma_tag),
+	DEVMETHOD_END
+};
+static driver_t ahci_driver = {
+	"ahci",
+	ahci_methods,
+	sizeof(struct ahci_controller)
+};
+DRIVER_MODULE(ahci, simplebus, ahci_driver, ahci_gen_devclass, NULL, NULL);