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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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