/* $NetBSD: pinctrl_single.c,v 1.6 2021/11/07 17:12:25 jmcneill Exp $ */

/*-
* Copyright (c) 2019 Jared McNeill <[email protected]>
* 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 1.6 2021/11/07 17:12:25 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 device_compatible_entry compat_data[] = {
       { .compat = "pinctrl-single",   .data = &pinctrl_config },
       { .compat = "pinconf-single",   .data = &pinconf_config },
       DEVICE_COMPAT_EOL
};

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 && len != 8)
               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 >= 4 + len) {
               const int off = be32toh(pins[0]);
               const int val = be32toh(pins[1]);
               const int mux = len == 4 ? 0 : be32toh(pins[2]);

               pinctrl_single_pins_write(sc, off, val | mux);
               pins += 1 + (len / 4);
               pinslen -= (4 + len);
       }

       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_compatible_match(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 = of_compatible_lookup(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);

You are viewing proxied material from ftp.icm.edu.pl. The copyright of proxied material belongs to its original authors. Any comments or complaints in relation to proxied material should be directed to the original authors of the content concerned. Please see the disclaimer for more details.