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[src/trunk]: src/sys/dev/fdt Add FDT DMA controller API.
details: https://anonhg.NetBSD.org/src/rev/c1afe39f93b2
branches: trunk
changeset: 823619:c1afe39f93b2
user: jmcneill <jmcneill%NetBSD.org@localhost>
date: Sat Apr 29 11:00:56 2017 +0000
description:
Add FDT DMA controller API.
diffstat:
sys/dev/fdt/fdt_dma.c | 190 ++++++++++++++++++++++++++++++++++++++++++++++++++
sys/dev/fdt/fdtvar.h | 57 ++++++++++++++-
sys/dev/fdt/files.fdt | 3 +-
3 files changed, 248 insertions(+), 2 deletions(-)
diffs (296 lines):
diff -r 3029cb26a76f -r c1afe39f93b2 sys/dev/fdt/fdt_dma.c
--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/sys/dev/fdt/fdt_dma.c Sat Apr 29 11:00:56 2017 +0000
@@ -0,0 +1,190 @@
+/* $NetBSD: fdt_dma.c,v 1.1 2017/04/29 11:00:56 jmcneill Exp $ */
+
+/*-
+ * Copyright (c) 2015 Jared D. McNeill <jmcneill%invisible.ca@localhost>
+ * 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 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>
+__KERNEL_RCSID(0, "$NetBSD: fdt_dma.c,v 1.1 2017/04/29 11:00:56 jmcneill Exp $");
+
+#include <sys/param.h>
+#include <sys/bus.h>
+#include <sys/kmem.h>
+
+#include <libfdt.h>
+#include <dev/fdt/fdtvar.h>
+
+struct fdtbus_dma_controller {
+ device_t dma_dev;
+ int dma_phandle;
+ const struct fdtbus_dma_controller_func *dma_funcs;
+
+ struct fdtbus_dma_controller *dma_next;
+};
+
+static struct fdtbus_dma_controller *fdtbus_dma = NULL;
+
+int
+fdtbus_register_dma_controller(device_t dev, int phandle,
+ const struct fdtbus_dma_controller_func *funcs)
+{
+ struct fdtbus_dma_controller *dma;
+
+ dma = kmem_alloc(sizeof(*dma), KM_SLEEP);
+ dma->dma_dev = dev;
+ dma->dma_phandle = phandle;
+ dma->dma_funcs = funcs;
+
+ dma->dma_next = fdtbus_dma;
+ fdtbus_dma = dma;
+
+ return 0;
+}
+
+static struct fdtbus_dma_controller *
+fdtbus_get_dma_controller(int phandle)
+{
+ struct fdtbus_dma_controller *dma;
+
+ for (dma = fdtbus_dma; dma; dma = dma->dma_next) {
+ if (dma->dma_phandle == phandle) {
+ return dma;
+ }
+ }
+
+ return NULL;
+}
+
+struct fdtbus_dma *
+fdtbus_dma_get_index(int phandle, u_int index, void (*cb)(void *), void *cbarg)
+{
+ struct fdtbus_dma_controller *dc;
+ struct fdtbus_dma *dma = NULL;
+ void *dma_priv = NULL;
+ uint32_t *dmas = NULL;
+ uint32_t *p;
+ u_int n, dma_cells;
+ int len, resid;
+
+ len = OF_getproplen(phandle, "dmas");
+ if (len <= 0)
+ return NULL;
+
+ dmas = kmem_alloc(len, KM_SLEEP);
+ if (OF_getprop(phandle, "dmas", dmas, len) != len) {
+ kmem_free(dmas, len);
+ return NULL;
+ }
+
+ p = dmas;
+ for (n = 0, resid = len; resid > 0; n++) {
+ const int dc_phandle =
+ fdtbus_get_phandle_from_native(be32toh(p[0]));
+ if (of_getprop_uint32(dc_phandle, "#dma-cells", &dma_cells))
+ break;
+ if (n == index) {
+ dc = fdtbus_get_dma_controller(dc_phandle);
+ if (dc == NULL)
+ goto done;
+ dma_priv = dc->dma_funcs->acquire(dc->dma_dev,
+ dma_cells > 0 ? &p[1] : NULL, dma_cells * 4,
+ cb, cbarg);
+ if (dma_priv) {
+ dma = kmem_alloc(sizeof(*dma), KM_SLEEP);
+ dma->dma_dc = dc;
+ dma->dma_priv = dma_priv;
+ }
+ break;
+ }
+ resid -= (dma_cells + 1) * 4;
+ p += dma_cells + 1;
+ }
+
+done:
+ if (dmas)
+ kmem_free(dmas, len);
+
+ return dma;
+}
+
+struct fdtbus_dma *
+fdtbus_dma_get(int phandle, const char *name, void (*cb)(void *), void *cbarg)
+{
+ struct fdtbus_dma *dma = NULL;
+ char *dma_names = NULL;
+ const char *p;
+ u_int index;
+ int len, resid;
+
+ len = OF_getproplen(phandle, "dma-names");
+ if (len <= 0)
+ return NULL;
+
+ dma_names = kmem_alloc(len, KM_SLEEP);
+ if (OF_getprop(phandle, "dma-names", dma_names, len) != len) {
+ kmem_free(dma_names, len);
+ return NULL;
+ }
+
+ p = dma_names;
+ for (index = 0, resid = len; resid > 0; index++) {
+ if (strcmp(p, name) == 0) {
+ dma = fdtbus_dma_get_index(phandle, index, cb, cbarg);
+ break;
+ }
+ resid -= strlen(p);
+ p += strlen(p) + 1;
+ }
+
+ if (dma_names)
+ kmem_free(dma_names, len);
+
+ return dma;
+}
+
+void
+fdtbus_dma_put(struct fdtbus_dma *dma)
+{
+ struct fdtbus_dma_controller *dc = dma->dma_dc;
+
+ dc->dma_funcs->release(dc->dma_dev, dma->dma_priv);
+ kmem_free(dma, sizeof(*dma));
+}
+
+int
+fdtbus_dma_transfer(struct fdtbus_dma *dma, struct fdtbus_dma_req *req)
+{
+ struct fdtbus_dma_controller *dc = dma->dma_dc;
+
+ return dc->dma_funcs->transfer(dc->dma_dev, dma->dma_priv, req);
+}
+
+void
+fdtbus_dma_halt(struct fdtbus_dma *dma)
+{
+ struct fdtbus_dma_controller *dc = dma->dma_dc;
+
+ return dc->dma_funcs->halt(dc->dma_dev, dma->dma_priv);
+}
diff -r 3029cb26a76f -r c1afe39f93b2 sys/dev/fdt/fdtvar.h
--- a/sys/dev/fdt/fdtvar.h Sat Apr 29 11:00:17 2017 +0000
+++ b/sys/dev/fdt/fdtvar.h Sat Apr 29 11:00:56 2017 +0000
@@ -1,4 +1,4 @@
-/* $NetBSD: fdtvar.h,v 1.13 2017/04/26 01:51:52 jmcneill Exp $ */
+/* $NetBSD: fdtvar.h,v 1.14 2017/04/29 11:00:56 jmcneill Exp $ */
/*-
* Copyright (c) 2015 Jared D. McNeill <jmcneill%invisible.ca@localhost>
@@ -119,6 +119,51 @@
int (*reset_deassert)(device_t, void *);
};
+struct fdtbus_dma_controller;
+
+struct fdtbus_dma {
+ struct fdtbus_dma_controller *dma_dc;
+ void *dma_priv;
+};
+
+enum fdtbus_dma_dir {
+ FDT_DMA_READ, /* device -> memory */
+ FDT_DMA_WRITE /* memory -> device */
+};
+
+struct fdtbus_dma_opt {
+ int opt_bus_width; /* Bus width */
+ int opt_burst_len; /* Burst length */
+ int opt_swap; /* Enable data swapping */
+ int opt_dblbuf; /* Enable double buffering */
+ int opt_wrap_len; /* Address wrap-around window */
+};
+
+struct fdtbus_dma_req {
+ bus_dma_segment_t *dreq_segs; /* Memory */
+ int dreq_nsegs;
+
+ bus_addr_t dreq_dev_phys; /* Device */
+ int dreq_sel; /* Device selector */
+
+ enum fdtbus_dma_dir dreq_dir; /* Transfer direction */
+
+ int dreq_block_irq; /* Enable IRQ at end of block */
+ int dreq_block_multi; /* Enable multiple block transfers */
+ int dreq_flow; /* Enable flow control */
+
+ struct fdtbus_dma_opt dreq_mem_opt; /* Memory options */
+ struct fdtbus_dma_opt dreq_dev_opt; /* Device options */
+};
+
+struct fdtbus_dma_controller_func {
+ void * (*acquire)(device_t, const void *, size_t,
+ void (*)(void *), void *);
+ void (*release)(device_t, void *);
+ int (*transfer)(device_t, void *, struct fdtbus_dma_req *);
+ void (*halt)(device_t, void *);
+};
+
int fdtbus_register_interrupt_controller(device_t, int,
const struct fdtbus_interrupt_controller_func *);
int fdtbus_register_i2c_controller(device_t, int,
@@ -133,6 +178,8 @@
const struct fdtbus_clock_controller_func *);
int fdtbus_register_reset_controller(device_t, int,
const struct fdtbus_reset_controller_func *);
+int fdtbus_register_dma_controller(device_t, int,
+ const struct fdtbus_dma_controller_func *);
int fdtbus_get_reg(int, u_int, bus_addr_t *, bus_size_t *);
int fdtbus_get_phandle(int, const char *);
@@ -159,6 +206,14 @@
int fdtbus_regulator_get_voltage(struct fdtbus_regulator *,
u_int *);
+struct fdtbus_dma *fdtbus_dma_get(int, const char *, void (*)(void *), void *);
+struct fdtbus_dma *fdtbus_dma_get_index(int, u_int, void (*)(void *),
+ void *);
+void fdtbus_dma_put(struct fdtbus_dma *);
+int fdtbus_dma_transfer(struct fdtbus_dma *,
+ struct fdtbus_dma_req *);
+void fdtbus_dma_halt(struct fdtbus_dma *);
+
struct clk * fdtbus_clock_get(int, const char *);
struct clk * fdtbus_clock_get_index(int, u_int);
diff -r 3029cb26a76f -r c1afe39f93b2 sys/dev/fdt/files.fdt
--- a/sys/dev/fdt/files.fdt Sat Apr 29 11:00:17 2017 +0000
+++ b/sys/dev/fdt/files.fdt Sat Apr 29 11:00:56 2017 +0000
@@ -1,4 +1,4 @@
-# $NetBSD: files.fdt,v 1.11 2017/04/26 01:51:52 jmcneill Exp $
+# $NetBSD: files.fdt,v 1.12 2017/04/29 11:00:56 jmcneill Exp $
include "external/bsd/libfdt/conf/files.libfdt"
@@ -25,6 +25,7 @@
file dev/fdt/fdt_openfirm.c fdtbus
file dev/fdt/fdt_subr.c fdtbus
file dev/fdt/fdt_clock.c fdtbus
+file dev/fdt/fdt_dma.c fdtbus
file dev/fdt/fdt_gpio.c fdtbus
file dev/fdt/fdt_i2c.c fdtbus
file dev/fdt/fdt_intr.c fdtbus
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