start working on a driver for non volatile memory express controllers.

1 files changed, 58 insertions, 0 deletions

diff --git a/sys/dev/ic/nvmevar.h b/sys/dev/ic/nvmevar.h
new file mode 100644
index 00000000000..f7947fd79fe
--- /dev/null
+++ b/sys/dev/ic/nvmevar.h
@@ -0,0 +1,58 @@
+/*	$OpenBSD: nvmevar.h,v 1.1 2014/04/12 05:06:58 dlg Exp $ */
+
+/*
+ * Copyright (c) 2014 David Gwynne <dlg@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.
+ */
+
+struct nvme_dmamem {
+	bus_dmamap_t		ndm_map;
+	bus_dma_segment_t	ndm_seg;
+	size_t			ndm_size;
+	caddr_t			ndm_kva;
+};
+#define NVME_DMA_MAP(_ndm)	((_ndm)->ndm_map)
+#define NVME_DMA_DVA(_ndm)	((u_int64_t)(_ndm)->ndm_map->dm_segs[0].ds_addr)
+#define NVME_DMA_KVA(_ndm)	((void *)(_ndm)->ndm_kva)
+
+struct nvme_queue {
+	struct nvme_dmamem	*q_sq_dmamem;
+	struct nvme_dmamem	*q_cq_dmamem;
+	bus_size_t 		q_sqtdbl; /* submission queue tail doorbell */
+	bus_size_t 		q_cqhdbl; /* completion queue head doorbell */
+	u_int			q_entries;
+	u_int			q_sq_head;
+	u_int			q_cq_tail;
+};
+
+struct nvme_softc {
+	struct device		sc_dev;
+
+	bus_space_tag_t		sc_iot;
+	bus_space_handle_t	sc_ioh;
+	bus_size_t		sc_ios;
+	bus_dma_tag_t		sc_dmat;
+
+	void			*sc_ih;
+
+	u_int			sc_rdy_to;
+
+	struct nvme_queue	*sc_admin_q;
+	struct nvme_queue	*sc_q;
+};
+
+int	nvme_attach(struct nvme_softc *);
+int	nvme_intr(void *);
+
+#define DEVNAME(_sc) ((_sc)->sc_dev.dv_xname)