qcom_tlmm_pin.c

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    1 /*-
    2  * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
    3  *
    4  * Copyright (c) 2021 Adrian Chadd <adrian@FreeBSD.org>
    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 unmodified, this list of conditions, and the following
   11  *    disclaimer.
   12  * 2. Redistributions in binary form must reproduce the above copyright
   13  *    notice, this list of conditions and the following disclaimer in the
   14  *    documentation and/or other materials provided with the distribution.
   15  *
   16  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
   17  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   18  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   19  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
   20  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   21  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   22  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   23  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   24  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   25  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   26  * SUCH DAMAGE.
   27  */
   28 
   29 #include <sys/cdefs.h>
   30 __FBSDID("$FreeBSD$");
   31 
   32 #include <sys/param.h>
   33 #include <sys/systm.h>
   34 #include <sys/bus.h>
   35 
   36 #include <sys/kernel.h>
   37 #include <sys/module.h>
   38 #include <sys/rman.h>
   39 #include <sys/lock.h>
   40 #include <sys/malloc.h>
   41 #include <sys/mutex.h>
   42 #include <sys/gpio.h>
   43 
   44 #include <machine/bus.h>
   45 #include <machine/resource.h>
   46 #include <dev/gpio/gpiobusvar.h>
   47 
   48 #include <dev/fdt/fdt_common.h>
   49 #include <dev/ofw/ofw_bus.h>
   50 #include <dev/ofw/ofw_bus_subr.h>
   51 
   52 #include <dev/fdt/fdt_pinctrl.h>
   53 
   54 #include "qcom_tlmm_var.h"
   55 #include "qcom_tlmm_pin.h"
   56 
   57 #include "qcom_tlmm_ipq4018_reg.h"
   58 #include "qcom_tlmm_ipq4018_hw.h"
   59 
   60 #include "gpio_if.h"
   61 
   62 static struct gpio_pin *
   63 qcom_tlmm_pin_lookup(struct qcom_tlmm_softc *sc, int pin)
   64 {
   65         if (pin >= sc->gpio_npins)
   66                 return (NULL);
   67 
   68         return &sc->gpio_pins[pin];
   69 }
   70 
   71 static void
   72 qcom_tlmm_pin_configure(struct qcom_tlmm_softc *sc,
   73     struct gpio_pin *pin, unsigned int flags)
   74 {
   75 
   76         GPIO_LOCK_ASSERT(sc);
   77 
   78         /*
   79          * Manage input/output
   80          */
   81         if (flags & (GPIO_PIN_INPUT|GPIO_PIN_OUTPUT)) {
   82                 pin->gp_flags &= ~(GPIO_PIN_INPUT|GPIO_PIN_OUTPUT);
   83                 if (flags & GPIO_PIN_OUTPUT) {
   84                         /*
   85                          * XXX TODO: read GPIO_PIN_PRESET_LOW /
   86                          * GPIO_PIN_PRESET_HIGH and if we're a GPIO
   87                          * function pin here, set the output
   88                          * pin value before we flip on oe_output.
   89                          */
   90                         pin->gp_flags |= GPIO_PIN_OUTPUT;
   91                         qcom_tlmm_ipq4018_hw_pin_set_oe_output(sc,
   92                             pin->gp_pin);
   93                 } else {
   94                         pin->gp_flags |= GPIO_PIN_INPUT;
   95                         qcom_tlmm_ipq4018_hw_pin_set_oe_input(sc,
   96                             pin->gp_pin);
   97                 }
   98         }
   99 
  100         /*
  101          * Set pull-up / pull-down configuration
  102          */
  103         if (flags & GPIO_PIN_PULLUP) {
  104                 pin->gp_flags |= GPIO_PIN_PULLUP;
  105                 qcom_tlmm_ipq4018_hw_pin_set_pupd_config(sc, pin->gp_pin,
  106                     QCOM_TLMM_PIN_PUPD_CONFIG_PULL_UP);
  107         } else if (flags & GPIO_PIN_PULLDOWN) {
  108                 pin->gp_flags |= GPIO_PIN_PULLDOWN;
  109                 qcom_tlmm_ipq4018_hw_pin_set_pupd_config(sc, pin->gp_pin,
  110                     QCOM_TLMM_PIN_PUPD_CONFIG_PULL_DOWN);
  111         } else if ((flags & (GPIO_PIN_PULLUP | GPIO_PIN_PULLDOWN)) ==
  112             (GPIO_PIN_PULLUP | GPIO_PIN_PULLDOWN)) {
  113                 pin->gp_flags |= GPIO_PIN_PULLUP | GPIO_PIN_PULLDOWN;
  114                 qcom_tlmm_ipq4018_hw_pin_set_pupd_config(sc, pin->gp_pin,
  115                     QCOM_TLMM_PIN_PUPD_CONFIG_BUS_HOLD);
  116         } else {
  117                 pin->gp_flags &= ~(GPIO_PIN_PULLUP | GPIO_PIN_PULLDOWN);
  118                 qcom_tlmm_ipq4018_hw_pin_set_pupd_config(sc, pin->gp_pin,
  119                     QCOM_TLMM_PIN_PUPD_CONFIG_DISABLE);
  120         }
  121 }
  122 
  123 device_t
  124 qcom_tlmm_get_bus(device_t dev)
  125 {
  126         struct qcom_tlmm_softc *sc;
  127 
  128         sc = device_get_softc(dev);
  129 
  130         return (sc->busdev);
  131 }
  132 
  133 int
  134 qcom_tlmm_pin_max(device_t dev, int *maxpin)
  135 {
  136         struct qcom_tlmm_softc *sc = device_get_softc(dev);
  137 
  138         *maxpin = sc->gpio_npins - 1;
  139         return (0);
  140 }
  141 
  142 int
  143 qcom_tlmm_pin_getcaps(device_t dev, uint32_t pin, uint32_t *caps)
  144 {
  145         struct qcom_tlmm_softc *sc = device_get_softc(dev);
  146         struct gpio_pin *p;
  147 
  148         p = qcom_tlmm_pin_lookup(sc, pin);
  149         if (p == NULL)
  150                 return (EINVAL);
  151 
  152         GPIO_LOCK(sc);
  153         *caps = p->gp_caps;
  154         GPIO_UNLOCK(sc);
  155 
  156         return (0);
  157 }
  158 
  159 int
  160 qcom_tlmm_pin_getflags(device_t dev, uint32_t pin, uint32_t *flags)
  161 {
  162         struct qcom_tlmm_softc *sc = device_get_softc(dev);
  163         uint32_t ret = 0, val;
  164         bool is_output;
  165         qcom_tlmm_pin_pupd_config_t pupd_config;
  166 
  167         if (pin >= sc->gpio_npins)
  168                 return (EINVAL);
  169 
  170         *flags = 0;
  171 
  172         GPIO_LOCK(sc);
  173 
  174         /* Lookup function - see what it is, whether we're a GPIO line */
  175         ret = qcom_tlmm_ipq4018_hw_pin_get_function(sc, pin, &val);
  176         if (ret != 0)
  177                 goto done;
  178 
  179         /* Lookup input/output state */
  180         ret = qcom_tlmm_ipq4018_hw_pin_get_oe_state(sc, pin, &is_output);
  181         if (ret != 0)
  182                 goto done;
  183         if (is_output)
  184                 *flags |= GPIO_PIN_OUTPUT;
  185         else
  186                 *flags |= GPIO_PIN_INPUT;
  187 
  188         /* Lookup pull-up / pull-down state */
  189         ret = qcom_tlmm_ipq4018_hw_pin_get_pupd_config(sc, pin,
  190             &pupd_config);
  191         if (ret != 0)
  192                 goto done;
  193 
  194         switch (pupd_config) {
  195         case QCOM_TLMM_PIN_PUPD_CONFIG_DISABLE:
  196                 break;
  197         case QCOM_TLMM_PIN_PUPD_CONFIG_PULL_DOWN:
  198                 *flags |= GPIO_PIN_PULLDOWN;
  199                 break;
  200         case QCOM_TLMM_PIN_PUPD_CONFIG_PULL_UP:
  201                 *flags |= GPIO_PIN_PULLUP;
  202                 break;
  203         case QCOM_TLMM_PIN_PUPD_CONFIG_BUS_HOLD:
  204                 *flags |= (GPIO_PIN_PULLUP | GPIO_PIN_PULLDOWN);
  205                 break;
  206         }
  207 
  208 done:
  209         GPIO_UNLOCK(sc);
  210         return (ret);
  211 }
  212 
  213 int
  214 qcom_tlmm_pin_getname(device_t dev, uint32_t pin, char *name)
  215 {
  216         struct qcom_tlmm_softc *sc = device_get_softc(dev);
  217         struct gpio_pin *p;
  218 
  219         p = qcom_tlmm_pin_lookup(sc, pin);
  220         if (p == NULL)
  221                 return (EINVAL);
  222 
  223         GPIO_LOCK(sc);
  224         memcpy(name, p->gp_name, GPIOMAXNAME);
  225         GPIO_UNLOCK(sc);
  226 
  227         return (0);
  228 }
  229 
  230 int
  231 qcom_tlmm_pin_setflags(device_t dev, uint32_t pin, uint32_t flags)
  232 {
  233         struct qcom_tlmm_softc *sc = device_get_softc(dev);
  234         struct gpio_pin *p;
  235 
  236         p = qcom_tlmm_pin_lookup(sc, pin);
  237         if (p == NULL)
  238                 return (EINVAL);
  239 
  240         GPIO_LOCK(sc);
  241         qcom_tlmm_pin_configure(sc, p, flags);
  242         GPIO_UNLOCK(sc);
  243 
  244         return (0);
  245 }
  246 
  247 int
  248 qcom_tlmm_pin_set(device_t dev, uint32_t pin, unsigned int value)
  249 {
  250         struct qcom_tlmm_softc *sc = device_get_softc(dev);
  251         int ret;
  252 
  253         if (pin >= sc->gpio_npins)
  254                 return (EINVAL);
  255 
  256         GPIO_LOCK(sc);
  257         ret = qcom_tlmm_ipq4018_hw_pin_set_output_value(sc, pin, value);
  258         GPIO_UNLOCK(sc);
  259 
  260         return (ret);
  261 }
  262 
  263 int
  264 qcom_tlmm_pin_get(device_t dev, uint32_t pin, unsigned int *val)
  265 {
  266         struct qcom_tlmm_softc *sc = device_get_softc(dev);
  267         int ret;
  268 
  269         if (pin >= sc->gpio_npins)
  270                 return (EINVAL);
  271 
  272         GPIO_LOCK(sc);
  273         ret = qcom_tlmm_ipq4018_hw_pin_get_input_value(sc, pin, val);
  274         GPIO_UNLOCK(sc);
  275 
  276         return (ret);
  277 }
  278 
  279 int
  280 qcom_tlmm_pin_toggle(device_t dev, uint32_t pin)
  281 {
  282         struct qcom_tlmm_softc *sc = device_get_softc(dev);
  283         int ret;
  284 
  285         if (pin >= sc->gpio_npins)
  286                 return (EINVAL);
  287 
  288         GPIO_LOCK(sc);
  289         ret = qcom_tlmm_ipq4018_hw_pin_toggle_output_value(sc, pin);
  290         GPIO_UNLOCK(sc);
  291 
  292         return (ret);
  293 }
  294 
  295 int
  296 qcom_tlmm_filter(void *arg)
  297 {
  298 
  299         /* TODO: something useful */
  300         return (FILTER_STRAY);
  301 }
  302 
  303 void
  304 qcom_tlmm_intr(void *arg)
  305 {
  306         struct qcom_tlmm_softc *sc = arg;
  307         GPIO_LOCK(sc);
  308         /* TODO: something useful */
  309         GPIO_UNLOCK(sc);
  310 }
  311 
  312 /*
  313  * ofw bus interface
  314  */
  315 phandle_t
  316 qcom_tlmm_pin_get_node(device_t dev, device_t bus)
  317 {
  318 
  319         /* We only have one child, the GPIO bus, which needs our own node. */
  320         return (ofw_bus_get_node(dev));
  321 }
  322

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FreeBSD/Linux Kernel Cross Reference sys/dev/qcom_tlmm/qcom_tlmm_pin.c

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sys/dev/qcom_tlmm/qcom_tlmm_pin.c