434 lines
11 KiB
C
434 lines
11 KiB
C
/*-
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* Copyright 2015 John Wehle <john@feith.com>
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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/*
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* Amlogic aml8726 pinctrl driver.
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*
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*/
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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#include <sys/param.h>
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#include <sys/systm.h>
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#include <sys/conf.h>
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#include <sys/bus.h>
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#include <sys/kernel.h>
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#include <sys/module.h>
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#include <sys/lock.h>
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#include <sys/mutex.h>
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#include <sys/resource.h>
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#include <sys/rman.h>
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#include <machine/bus.h>
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#include <dev/fdt/fdt_common.h>
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#include <dev/fdt/fdt_pinctrl.h>
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#include <dev/ofw/ofw_bus.h>
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#include <dev/ofw/ofw_bus_subr.h>
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#include <arm/amlogic/aml8726/aml8726_soc.h>
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#include <arm/amlogic/aml8726/aml8726_pinctrl.h>
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struct aml8726_pinctrl_softc {
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device_t dev;
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struct {
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struct aml8726_pinctrl_function *func;
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struct aml8726_pinctrl_pkg_pin *ppin;
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boolean_t pud_ctrl;
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} soc;
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struct resource *res[6];
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struct mtx mtx;
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};
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static struct resource_spec aml8726_pinctrl_spec[] = {
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{ SYS_RES_MEMORY, 0, RF_ACTIVE }, /* mux */
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{ SYS_RES_MEMORY, 1, RF_ACTIVE | RF_SHAREABLE }, /* pu/pd */
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{ SYS_RES_MEMORY, 2, RF_ACTIVE | RF_SHAREABLE }, /* pull enable */
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{ SYS_RES_MEMORY, 3, RF_ACTIVE }, /* ao mux */
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{ SYS_RES_MEMORY, 4, RF_ACTIVE | RF_SHAREABLE }, /* ao pu/pd */
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{ SYS_RES_MEMORY, 5, RF_ACTIVE | RF_SHAREABLE }, /* ao pull enable */
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{ -1, 0 }
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};
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#define AML_PINCTRL_LOCK(sc) mtx_lock(&(sc)->mtx)
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#define AML_PINCTRL_UNLOCK(sc) mtx_unlock(&(sc)->mtx)
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#define AML_PINCTRL_LOCK_INIT(sc) \
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mtx_init(&(sc)->mtx, device_get_nameunit((sc)->dev), \
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"pinctrl", MTX_DEF)
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#define AML_PINCTRL_LOCK_DESTROY(sc) mtx_destroy(&(sc)->mtx);
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#define MUX_WRITE_4(sc, reg, val) bus_write_4((sc)->res[0], reg, (val))
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#define MUX_READ_4(sc, reg) bus_read_4((sc)->res[0], reg)
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#define PUD_WRITE_4(sc, reg, val) bus_write_4((sc)->res[1], reg, (val))
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#define PUD_READ_4(sc, reg) bus_read_4((sc)->res[1], reg)
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#define PEN_WRITE_4(sc, reg, val) bus_write_4((sc)->res[2], reg, (val))
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#define PEN_READ_4(sc, reg) bus_read_4((sc)->res[2], reg)
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#define AOMUX_WRITE_4(sc, reg, val) bus_write_4((sc)->res[3], reg, (val))
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#define AOMUX_READ_4(sc, reg) bus_read_4((sc)->res[3], reg)
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#define AOPUD_WRITE_4(sc, reg, val) bus_write_4((sc)->res[4], reg, (val))
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#define AOPUD_READ_4(sc, reg) bus_read_4((sc)->res[4], reg)
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#define AOPEN_WRITE_4(sc, reg, val) bus_write_4((sc)->res[5], reg, (val))
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#define AOPEN_READ_4(sc, reg) bus_read_4((sc)->res[5], reg)
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static int
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aml8726_pinctrl_probe(device_t dev)
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{
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if (!ofw_bus_status_okay(dev))
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return (ENXIO);
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if (!ofw_bus_is_compatible(dev, "amlogic,aml8726-pinctrl"))
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return (ENXIO);
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device_set_desc(dev, "Amlogic aml8726 pinctrl");
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return (BUS_PROBE_DEFAULT);
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}
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static int
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aml8726_pinctrl_attach(device_t dev)
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{
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struct aml8726_pinctrl_softc *sc = device_get_softc(dev);
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sc->dev = dev;
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sc->soc.pud_ctrl = false;
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switch (aml8726_soc_hw_rev) {
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case AML_SOC_HW_REV_M3:
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sc->soc.func = aml8726_m3_pinctrl;
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sc->soc.ppin = aml8726_m3_pkg_pin;
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break;
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case AML_SOC_HW_REV_M6:
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sc->soc.func = aml8726_m6_pinctrl;
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sc->soc.ppin = aml8726_m6_pkg_pin;
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break;
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case AML_SOC_HW_REV_M8:
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sc->soc.func = aml8726_m8_pinctrl;
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sc->soc.ppin = aml8726_m8_pkg_pin;
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sc->soc.pud_ctrl = true;
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break;
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case AML_SOC_HW_REV_M8B:
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sc->soc.func = aml8726_m8b_pinctrl;
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sc->soc.ppin = aml8726_m8b_pkg_pin;
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sc->soc.pud_ctrl = true;
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break;
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default:
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device_printf(dev, "unsupported SoC\n");
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return (ENXIO);
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/* NOTREACHED */
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}
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if (bus_alloc_resources(dev, aml8726_pinctrl_spec, sc->res)) {
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device_printf(dev, "could not allocate resources for device\n");
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return (ENXIO);
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}
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AML_PINCTRL_LOCK_INIT(sc);
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fdt_pinctrl_register(dev, "amlogic,pins");
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fdt_pinctrl_configure_tree(dev);
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return (0);
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}
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static int
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aml8726_pinctrl_detach(device_t dev)
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{
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struct aml8726_pinctrl_softc *sc = device_get_softc(dev);
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AML_PINCTRL_LOCK_DESTROY(sc);
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bus_release_resources(dev, aml8726_pinctrl_spec, sc->res);
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return (0);
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}
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static int
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aml8726_pinctrl_configure_pins(device_t dev, phandle_t cfgxref)
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{
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struct aml8726_pinctrl_softc *sc = device_get_softc(dev);
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struct aml8726_pinctrl_function *cf;
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struct aml8726_pinctrl_function *f;
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struct aml8726_pinctrl_pkg_pin *pp;
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struct aml8726_pinctrl_pin *cp;
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struct aml8726_pinctrl_pin *p;
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enum aml8726_pinctrl_pull_mode pm;
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char *function_name;
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char *pins;
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char *pin_name;
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char *pull;
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phandle_t node;
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ssize_t len;
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uint32_t value;
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node = OF_node_from_xref(cfgxref);
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len = OF_getprop_alloc(node, "amlogic,function",
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sizeof(char), (void **)&function_name);
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if (len < 0) {
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device_printf(dev,
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"missing amlogic,function attribute in FDT\n");
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return (ENXIO);
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}
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for (f = sc->soc.func; f->name != NULL; f++)
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if (strncmp(f->name, function_name, len) == 0)
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break;
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if (f->name == NULL) {
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device_printf(dev, "unknown function attribute %.*s in FDT\n",
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len, function_name);
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OF_prop_free(function_name);
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return (ENXIO);
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}
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OF_prop_free(function_name);
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len = OF_getprop_alloc(node, "amlogic,pull",
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sizeof(char), (void **)&pull);
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pm = aml8726_unknown_pm;
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if (len > 0) {
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if (strncmp(pull, "enable", len) == 0)
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pm = aml8726_enable_pm;
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else if (strncmp(pull, "disable", len) == 0)
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pm = aml8726_disable_pm;
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else if (strncmp(pull, "down", len) == 0)
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pm = aml8726_enable_down_pm;
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else if (strncmp(pull, "up", len) == 0)
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pm = aml8726_enable_up_pm;
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else {
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device_printf(dev,
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"unknown pull attribute %.*s in FDT\n",
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len, pull);
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OF_prop_free(pull);
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return (ENXIO);
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}
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}
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OF_prop_free(pull);
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/*
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* Setting the pull direction isn't supported on all SoC.
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*/
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switch (pm) {
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case aml8726_enable_down_pm:
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case aml8726_enable_up_pm:
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if (sc->soc.pud_ctrl == false) {
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device_printf(dev,
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"SoC doesn't support setting pull direction.\n");
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return (ENXIO);
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}
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break;
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default:
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break;
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}
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len = OF_getprop_alloc(node, "amlogic,pins",
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sizeof(char), (void **)&pins);
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if (len < 0) {
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device_printf(dev, "missing amlogic,pins attribute in FDT\n");
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return (ENXIO);
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}
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pin_name = pins;
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while (len) {
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for (p = f->pins; p->name != NULL; p++)
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if (strncmp(p->name, pin_name, len) == 0)
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break;
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if (p->name == NULL) {
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/* display message prior to queuing up next string */
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device_printf(dev, "unknown pin attribute %.*s in FDT\n",
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len, pin_name);
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}
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/* queue up next string */
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while (*pin_name && len) {
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pin_name++;
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len--;
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}
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if (len) {
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pin_name++;
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len--;
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}
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if (p->name == NULL)
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continue;
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for (pp = sc->soc.ppin; pp->pkg_name != NULL; pp++)
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if (strcmp(pp->pkg_name, p->pkg_name) == 0)
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break;
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if (pp->pkg_name == NULL) {
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device_printf(dev,
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"missing entry for package pin %s\n",
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p->pkg_name);
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continue;
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}
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if (pm != aml8726_unknown_pm && pp->pull_bits == 0x00000000) {
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device_printf(dev,
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"missing pull info for package pin %s\n",
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p->pkg_name);
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continue;
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}
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AML_PINCTRL_LOCK(sc);
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/*
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* First clear all other mux bits associated with this
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* package pin. This may briefly configure the pin as
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* GPIO ... however this should be fine since after
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* reset the default GPIO mode is input.
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*/
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for (cf = sc->soc.func; cf->name != NULL; cf++)
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for (cp = cf->pins; cp->name != NULL; cp++) {
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if (cp == p)
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continue;
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if (strcmp(cp->pkg_name, p->pkg_name) != 0)
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continue;
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if (cp->mux_bits == 0)
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continue;
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if (pp->aobus == false) {
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value = MUX_READ_4(sc, cp->mux_addr);
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value &= ~cp->mux_bits;
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MUX_WRITE_4(sc, cp->mux_addr, value);
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} else {
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value = AOMUX_READ_4(sc, cp->mux_addr);
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value &= ~cp->mux_bits;
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AOMUX_WRITE_4(sc, cp->mux_addr, value);
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}
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}
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/*
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* Now set the desired mux bits.
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*
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* In the case of GPIO there's no bits to set.
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*/
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if (p->mux_bits != 0) {
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if (pp->aobus == false) {
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value = MUX_READ_4(sc, p->mux_addr);
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value |= p->mux_bits;
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MUX_WRITE_4(sc, p->mux_addr, value);
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} else {
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value = AOMUX_READ_4(sc, p->mux_addr);
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value |= p->mux_bits;
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AOMUX_WRITE_4(sc, p->mux_addr, value);
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}
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}
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/*
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* Finally set the pull mode if it was specified.
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*/
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switch (pm) {
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case aml8726_enable_down_pm:
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case aml8726_enable_up_pm:
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if (pp->aobus == false) {
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value = PUD_READ_4(sc, pp->pull_addr);
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if (pm == aml8726_enable_down_pm)
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value &= ~pp->pull_bits;
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else
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value |= pp->pull_bits;
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PUD_WRITE_4(sc, pp->pull_addr, value);
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} else {
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value = AOPUD_READ_4(sc, pp->pull_addr);
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if (pm == aml8726_enable_down_pm)
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value &= ~(pp->pull_bits << 16);
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else
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value |= (pp->pull_bits << 16);
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AOPUD_WRITE_4(sc, pp->pull_addr, value);
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}
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/* FALLTHROUGH */
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case aml8726_disable_pm:
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case aml8726_enable_pm:
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if (pp->aobus == false) {
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value = PEN_READ_4(sc, pp->pull_addr);
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if (pm == aml8726_disable_pm)
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value &= ~pp->pull_bits;
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else
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value |= pp->pull_bits;
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PEN_WRITE_4(sc, pp->pull_addr, value);
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} else {
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value = AOPEN_READ_4(sc, pp->pull_addr);
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if (pm == aml8726_disable_pm)
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value &= ~pp->pull_bits;
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else
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value |= pp->pull_bits;
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AOPEN_WRITE_4(sc, pp->pull_addr, value);
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}
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break;
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default:
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break;
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}
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AML_PINCTRL_UNLOCK(sc);
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}
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OF_prop_free(pins);
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return (0);
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}
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static device_method_t aml8726_pinctrl_methods[] = {
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/* Device interface */
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DEVMETHOD(device_probe, aml8726_pinctrl_probe),
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DEVMETHOD(device_attach, aml8726_pinctrl_attach),
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DEVMETHOD(device_detach, aml8726_pinctrl_detach),
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/* fdt_pinctrl interface */
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DEVMETHOD(fdt_pinctrl_configure,aml8726_pinctrl_configure_pins),
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DEVMETHOD_END
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};
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static driver_t aml8726_pinctrl_driver = {
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"pinctrl",
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aml8726_pinctrl_methods,
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sizeof(struct aml8726_pinctrl_softc),
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};
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static devclass_t aml8726_pinctrl_devclass;
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EARLY_DRIVER_MODULE(pinctrl, simplebus, aml8726_pinctrl_driver,
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aml8726_pinctrl_devclass, 0, 0, BUS_PASS_CPU + BUS_PASS_ORDER_LATE);
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