sys/arm/mv/mvebu_pinctrl.c

   1 /*-
   2  * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
   3  *
   4  * Copyright (c) 2018 Rubicon Communications, LLC (Netgate)
   5  *
   6  * Redistribution and use in source and binary forms, with or without
   7  * modification, are permitted provided that the following conditions
   8  * are met:
   9  * 1. Redistributions of source code must retain the above copyright
  10  *    notice, this list of conditions and the following disclaimer.
  11  * 2. Redistributions in binary form must reproduce the above copyright
  12  *    notice, this list of conditions and the following disclaimer in the
  13  *    documentation and/or other materials provided with the distribution.
  14  *
  15  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
  16  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  17  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  18  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
  19  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  20  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  21  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  22  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  23  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  24  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  25  * SUCH DAMAGE.
  26  *
  27  * $FreeBSD$
  28  */
  29
  30 #include <sys/cdefs.h>
  31 __FBSDID("$FreeBSD$");
  32
  33 #include <sys/param.h>
  34 #include <sys/systm.h>
  35 #include <sys/bus.h>
  36
  37 #include <sys/kernel.h>
  38 #include <sys/module.h>
  39 #include <sys/rman.h>
  40 #include <sys/lock.h>
  41 #include <sys/mutex.h>
  42
  43 #include <machine/bus.h>
  44 #include <machine/resource.h>
  45 #include <machine/intr.h>
  46
  47 #include <dev/extres/syscon/syscon.h>
  48
  49 #include <dev/fdt/fdt_pinctrl.h>
  50
  51 #include <dev/ofw/ofw_bus.h>
  52 #include <dev/ofw/ofw_bus_subr.h>
  53
  54 #include "syscon_if.h"
  55
  56 #define PINS_PER_REG    8
  57 #define BITS_PER_PIN    4
  58 #define PINS_MASK       0xf
  59 #define MAX_PIN_FUNC    5
  60
  61 struct mv_pins {
  62         const char      *name;
  63         const char      *functions[MAX_PIN_FUNC];
  64 };
  65
  66 struct mv_padconf {
  67         const struct mv_pins    *pins;
  68         size_t          npins;
  69 };
  70
  71 const static struct mv_pins ap806_pins[] = {
  72         {"mpp0", {"gpio", "sdio", NULL, "spi0"}},
  73         {"mpp1", {"gpio", "sdio", NULL, "spi0"}},
  74         {"mpp2", {"gpio", "sdio", NULL, "spi0"}},
  75         {"mpp3", {"gpio", "sdio", NULL, "spi0"}},
  76         {"mpp4", {"gpio", "sdio", NULL, "i2c0"}},
  77         {"mpp5", {"gpio", "sdio", NULL, "i2c0"}},
  78         {"mpp6", {"gpio", "sdio", NULL, NULL}},
  79         {"mpp7", {"gpio", "sdio", NULL, "uart1"}},
  80         {"mpp8", {"gpio", "sdio", NULL, "uart1"}},
  81         {"mpp9", {"gpio", "sdio", NULL, "spi0"}},
  82         {"mpp10", {"gpio", "sdio", NULL, NULL}},
  83         {"mpp11", {"gpio", NULL, NULL, "uart0"}},
  84         {"mpp12", {"gpio", "sdio", "sdio", NULL}},
  85         {"mpp13", {"gpio", NULL, NULL}},
  86         {"mpp14", {"gpio", NULL, NULL}},
  87         {"mpp15", {"gpio", NULL, NULL}},
  88         {"mpp16", {"gpio", NULL, NULL}},
  89         {"mpp17", {"gpio", NULL, NULL}},
  90         {"mpp18", {"gpio", NULL, NULL}},
  91         {"mpp19", {"gpio", NULL, NULL, "uart0", "sdio"}},
  92 };
  93
  94 const struct mv_padconf ap806_padconf = {
  95         .npins = nitems(ap806_pins),
  96         .pins = ap806_pins,
  97 };
  98
  99 struct mv_pinctrl_softc {
 100         device_t                dev;
 101         struct syscon           *syscon;
 102
 103         struct mv_padconf       *padconf;
 104 };
 105
 106 static struct ofw_compat_data compat_data[] = {
 107         {"marvell,ap806-pinctrl", (uintptr_t)&ap806_padconf},
 108         {NULL,             0}
 109 };
 110
 111 #define RD4(sc, reg)            SYSCON_READ_4((sc)->syscon, (reg))
 112 #define WR4(sc, reg, val)       SYSCON_WRITE_4((sc)->syscon, (reg), (val))
 113
 114 static void
 115 mv_pinctrl_configure_pin(struct mv_pinctrl_softc *sc, uint32_t pin,
 116     uint32_t function)
 117 {
 118         uint32_t offset, shift, reg;
 119
 120         offset = (pin / PINS_PER_REG) * BITS_PER_PIN;
 121         shift = (pin % PINS_PER_REG) * BITS_PER_PIN;
 122         reg = RD4(sc, offset);
 123         reg &= ~(PINS_MASK << shift);
 124         reg |= function << shift;
 125         WR4(sc, offset, reg);
 126 }
 127
 128 static int
 129 mv_pinctrl_configure_pins(device_t dev, phandle_t cfgxref)
 130 {
 131         struct mv_pinctrl_softc *sc;
 132         phandle_t node;
 133         char *function;
 134         const char **pins;
 135         int i, pin_num, pin_func, npins;
 136
 137         sc = device_get_softc(dev);
 138         node = OF_node_from_xref(cfgxref);
 139
 140         if (OF_getprop_alloc(node, "marvell,function",
 141             (void **)&function) == -1)
 142                 return (ENOMEM);
 143
 144         npins = ofw_bus_string_list_to_array(node, "marvell,pins", &pins);
 145         if (npins == -1)
 146                 return (ENOMEM);
 147
 148         for (i = 0; i < npins; i++) {
 149                 for (pin_num = 0; pin_num < sc->padconf->npins; pin_num++) {
 150                         if (strcmp(pins[i], sc->padconf->pins[pin_num].name) == 0)
 151                                 break;
 152                 }
 153                 if (pin_num == sc->padconf->npins)
 154                         continue;
 155
 156                 for (pin_func = 0; pin_func < MAX_PIN_FUNC; pin_func++)
 157                         if (sc->padconf->pins[pin_num].functions[pin_func] &&
 158                             strcmp(function, sc->padconf->pins[pin_num].functions[pin_func]) == 0)
 159                                 break;
 160
 161                 if (pin_func == MAX_PIN_FUNC)
 162                         continue;
 163
 164                 mv_pinctrl_configure_pin(sc, pin_num, pin_func);
 165         }
 166
 167         OF_prop_free(pins);
 168
 169         return (0);
 170 }
 171
 172 static int
 173 mv_pinctrl_probe(device_t dev)
 174 {
 175
 176         if (!ofw_bus_status_okay(dev))
 177                 return (ENXIO);
 178
 179         if (ofw_bus_search_compatible(dev, compat_data)->ocd_data == 0)
 180                 return (ENXIO);
 181
 182         device_set_desc(dev, "Marvell Pinctrl controller");
 183         return (BUS_PROBE_DEFAULT);
 184 }
 185
 186 static int
 187 mv_pinctrl_attach(device_t dev)
 188 {
 189         struct mv_pinctrl_softc *sc;
 190
 191         sc = device_get_softc(dev);
 192         sc->dev = dev;
 193         sc->padconf = (struct mv_padconf *)
 194             ofw_bus_search_compatible(dev,compat_data)->ocd_data;
 195
 196         if (SYSCON_GET_HANDLE(sc->dev, &sc->syscon) != 0 ||
 197             sc->syscon == NULL) {
 198                 device_printf(dev, "cannot get syscon for device\n");
 199                 return (ENXIO);
 200         }
 201
 202         fdt_pinctrl_register(dev, "marvell,pins");
 203         fdt_pinctrl_configure_tree(dev);
 204
 205         return (0);
 206 }
 207
 208 static int
 209 mv_pinctrl_detach(device_t dev)
 210 {
 211
 212         return (EBUSY);
 213 }
 214
 215 static device_method_t mv_pinctrl_methods[] = {
 216         /* Device interface */
 217         DEVMETHOD(device_probe,         mv_pinctrl_probe),
 218         DEVMETHOD(device_attach,        mv_pinctrl_attach),
 219         DEVMETHOD(device_detach,        mv_pinctrl_detach),
 220
 221         /* fdt_pinctrl interface */
 222         DEVMETHOD(fdt_pinctrl_configure,mv_pinctrl_configure_pins),
 223
 224         DEVMETHOD_END
 225 };
 226
 227 static driver_t mv_pinctrl_driver = {
 228         "mv_pinctrl",
 229         mv_pinctrl_methods,
 230         sizeof(struct mv_pinctrl_softc),
 231 };
 232
 233 EARLY_DRIVER_MODULE(mv_pinctrl, simplebus, mv_pinctrl_driver, 0, 0,
 234     BUS_PASS_INTERRUPT + BUS_PASS_ORDER_LATE);