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[src/trunk]: src/sys/dev/fdt Add driver for one-register-per-pin type pinctrl...
details: https://anonhg.NetBSD.org/src/rev/5a001d31661e
branches: trunk
changeset: 845976:5a001d31661e
user: jmcneill <jmcneill%NetBSD.org@localhost>
date: Sun Oct 27 15:31:15 2019 +0000
description:
Add driver for one-register-per-pin type pinctrl devices.
diffstat:
sys/dev/fdt/files.fdt | 6 +-
sys/dev/fdt/pinctrl_single.c | 204 +++++++++++++++++++++++++++++++++++++++++++
2 files changed, 209 insertions(+), 1 deletions(-)
diffs (228 lines):
diff -r d63d92d5c9e8 -r 5a001d31661e sys/dev/fdt/files.fdt
--- a/sys/dev/fdt/files.fdt Sun Oct 27 12:28:13 2019 +0000
+++ b/sys/dev/fdt/files.fdt Sun Oct 27 15:31:15 2019 +0000
@@ -1,4 +1,4 @@
-# $NetBSD: files.fdt,v 1.45 2019/08/13 16:46:49 tnn Exp $
+# $NetBSD: files.fdt,v 1.46 2019/10/27 15:31:15 jmcneill Exp $
include "external/bsd/libfdt/conf/files.libfdt"
@@ -82,6 +82,10 @@
attach syscon at fdt
file dev/fdt/syscon.c syscon
+device pinctrl
+attach pinctrl at fdt with pinctrl_single
+file dev/fdt/pinctrl_single.c pinctrl_single
+
device pwmbacklight
attach pwmbacklight at fdt
file dev/fdt/pwm_backlight.c pwmbacklight
diff -r d63d92d5c9e8 -r 5a001d31661e sys/dev/fdt/pinctrl_single.c
--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/sys/dev/fdt/pinctrl_single.c Sun Oct 27 15:31:15 2019 +0000
@@ -0,0 +1,204 @@
+/* $NetBSD: pinctrl_single.c,v 1.1 2019/10/27 15:31:15 jmcneill Exp $ */
+
+/*-
+ * Copyright (c) 2019 Jared 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: pinctrl_single.c,v 1.1 2019/10/27 15:31:15 jmcneill Exp $");
+
+#include <sys/param.h>
+#include <sys/bus.h>
+#include <sys/device.h>
+#include <sys/systm.h>
+#include <sys/gpio.h>
+
+#include <dev/fdt/fdtvar.h>
+
+#define PINCTRL_FLAG_PINCONF __BIT(0) /* supports generic pinconf */
+
+struct pinctrl_single_config {
+ uint32_t flags;
+};
+
+static const struct pinctrl_single_config pinctrl_config = {
+};
+
+static const struct pinctrl_single_config pinconf_config = {
+ .flags = PINCTRL_FLAG_PINCONF
+};
+
+static const struct of_compat_data compat_data[] = {
+ { "pinctrl-single", (uintptr_t)&pinctrl_config },
+ { "pinconf-single", (uintptr_t)&pinconf_config },
+ { NULL }
+};
+
+struct pinctrl_single_softc {
+ device_t sc_dev;
+ int sc_phandle;
+ bus_space_tag_t sc_bst;
+ bus_space_handle_t sc_bsh;
+ uint32_t sc_flags;
+ u_int sc_regwidth;
+ u_int sc_funcmask;
+};
+
+static void
+pinctrl_single_pins_write(struct pinctrl_single_softc *sc, u_int off, u_int val)
+{
+ union {
+ uint32_t reg32;
+ uint16_t reg16;
+ uint8_t reg8;
+ } u;
+
+ aprint_debug_dev(sc->sc_dev, "writing %#x with %#x\n", off, val);
+
+ switch (sc->sc_regwidth) {
+ case 8:
+ u.reg8 = bus_space_read_1(sc->sc_bst, sc->sc_bsh, off);
+ u.reg8 &= ~sc->sc_funcmask;
+ u.reg8 |= val;
+ bus_space_write_1(sc->sc_bst, sc->sc_bsh, off, u.reg8);
+ break;
+ case 16:
+ u.reg16 = bus_space_read_2(sc->sc_bst, sc->sc_bsh, off);
+ u.reg16 &= ~sc->sc_funcmask;
+ u.reg16 |= val;
+ bus_space_write_2(sc->sc_bst, sc->sc_bsh, off, u.reg16);
+ break;
+ case 32:
+ u.reg32 = bus_space_read_4(sc->sc_bst, sc->sc_bsh, off);
+ u.reg32 &= ~sc->sc_funcmask;
+ u.reg32 |= val;
+ bus_space_write_4(sc->sc_bst, sc->sc_bsh, off, u.reg32);
+ break;
+ default:
+ device_printf(sc->sc_dev, "%s: unsupported reg width %d\n",
+ __func__, sc->sc_regwidth);
+ break;
+ }
+}
+
+static int
+pinctrl_single_pins_set_config(device_t dev, const void *data, size_t len)
+{
+ struct pinctrl_single_softc * const sc = device_private(dev);
+ const u_int *pins;
+ int pinslen;
+
+ if (len != 4)
+ return -1;
+
+ const int phandle = fdtbus_get_phandle_from_native(be32dec(data));
+
+ pins = fdtbus_get_prop(phandle, "pinctrl-single,pins", &pinslen);
+ if (pins == NULL)
+ return -1;
+
+ while (pinslen >= 8) {
+ const int off = be32toh(pins[0]);
+ const int val = be32toh(pins[1]);
+
+ pinctrl_single_pins_write(sc, off, val);
+ pins += 2;
+ pinslen -= 8;
+ }
+
+ return 0;
+}
+
+static struct fdtbus_pinctrl_controller_func pinctrl_single_pins_funcs = {
+ .set_config = pinctrl_single_pins_set_config,
+};
+
+static int
+pinctrl_single_match(device_t parent, cfdata_t cf, void *aux)
+{
+ struct fdt_attach_args * const faa = aux;
+
+ return of_match_compat_data(faa->faa_phandle, compat_data);
+}
+
+static void
+pinctrl_single_attach(device_t parent, device_t self, void *aux)
+{
+ struct pinctrl_single_softc * const sc = device_private(self);
+ struct fdt_attach_args * const faa = aux;
+ const int phandle = faa->faa_phandle;
+ const struct pinctrl_single_config *conf;
+ bus_addr_t addr;
+ bus_size_t size;
+ int child;
+
+ if (fdtbus_get_reg(phandle, 0, &addr, &size) != 0) {
+ aprint_error(": couldn't get registers\n");
+ return;
+ }
+
+ conf = (const void *)of_search_compatible(phandle, compat_data)->data;
+
+ sc->sc_dev = self;
+ sc->sc_phandle = phandle;
+ sc->sc_bst = faa->faa_bst;
+ if (bus_space_map(sc->sc_bst, addr, size, 0, &sc->sc_bsh) != 0) {
+ aprint_error(": couldn't map registers\n");
+ return;
+ }
+ sc->sc_flags = conf->flags;
+
+ if (of_getprop_uint32(phandle, "pinctrl-single,register-width", &sc->sc_regwidth) != 0) {
+ aprint_error(": missing 'pinctrl-single,register-width' property\n");
+ return;
+ }
+ if (of_getprop_uint32(phandle, "pinctrl-single,function-mask", &sc->sc_funcmask) != 0) {
+ aprint_error(": missing 'pinctrl-single,function-mask' property\n");
+ return;
+ }
+
+ switch (sc->sc_regwidth) {
+ case 8:
+ case 16:
+ case 32:
+ break;
+ default:
+ aprint_error(": register width %d not supported\n", sc->sc_regwidth);
+ return;
+ }
+
+ aprint_naive("\n");
+ aprint_normal("\n");
+
+ for (child = OF_child(phandle); child; child = OF_peer(child)) {
+ if (of_hasprop(child, "pinctrl-single,pins"))
+ fdtbus_register_pinctrl_config(self, child, &pinctrl_single_pins_funcs);
+ }
+
+ fdtbus_pinctrl_set_config(phandle, "default");
+}
+
+CFATTACH_DECL_NEW(pinctrl_single, sizeof(struct pinctrl_single_softc),
+ pinctrl_single_match, pinctrl_single_attach, NULL, NULL);
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