as3722.c

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    1 /*-
    2  * Copyright (c) 2016 Michal Meloun <mmel@FreeBSD.org>
    3  * All rights reserved.
    4  *
    5  * Redistribution and use in source and binary forms, with or without
    6  * modification, are permitted provided that the following conditions
    7  * are met:
    8  * 1. Redistributions of source code must retain the above copyright
    9  *    notice, this list of conditions and the following disclaimer.
   10  * 2. Redistributions in binary form must reproduce the above copyright
   11  *    notice, this list of conditions and the following disclaimer in the
   12  *    documentation and/or other materials provided with the distribution.
   13  *
   14  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
   15  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   16  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   17  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
   18  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   19  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   20  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   21  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   22  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   23  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   24  * SUCH DAMAGE.
   25  */
   26 
   27 #include <sys/cdefs.h>
   28 __FBSDID("$FreeBSD$");
   29 
   30 /*
   31  * AS3722 PMIC driver
   32  */
   33 
   34 #include <sys/param.h>
   35 #include <sys/systm.h>
   36 #include <sys/bus.h>
   37 #include <sys/gpio.h>
   38 #include <sys/kernel.h>
   39 #include <sys/module.h>
   40 #include <sys/malloc.h>
   41 #include <sys/rman.h>
   42 #include <sys/sx.h>
   43 
   44 #include <machine/bus.h>
   45 
   46 #include <dev/extres/regulator/regulator.h>
   47 #include <dev/fdt/fdt_pinctrl.h>
   48 #include <dev/gpio/gpiobusvar.h>
   49 #include <dev/iicbus/iiconf.h>
   50 #include <dev/iicbus/iicbus.h>
   51 #include <dev/ofw/ofw_bus.h>
   52 #include <dev/ofw/ofw_bus_subr.h>
   53 
   54 #include <dt-bindings/mfd/as3722.h>
   55 
   56 #include "clock_if.h"
   57 #include "regdev_if.h"
   58 
   59 #include "as3722.h"
   60 
   61 static struct ofw_compat_data compat_data[] = {
   62         {"ams,as3722",          1},
   63         {NULL,                  0},
   64 };
   65 
   66 #define LOCK(_sc)               sx_xlock(&(_sc)->lock)
   67 #define UNLOCK(_sc)             sx_xunlock(&(_sc)->lock)
   68 #define LOCK_INIT(_sc)          sx_init(&(_sc)->lock, "as3722")
   69 #define LOCK_DESTROY(_sc)       sx_destroy(&(_sc)->lock);
   70 #define ASSERT_LOCKED(_sc)      sx_assert(&(_sc)->lock, SA_XLOCKED);
   71 #define ASSERT_UNLOCKED(_sc)    sx_assert(&(_sc)->lock, SA_UNLOCKED);
   72 
   73 #define AS3722_DEVICE_ID        0x0C
   74 
   75 /*
   76  * Raw register access function.
   77  */
   78 int
   79 as3722_read(struct as3722_softc *sc, uint8_t reg, uint8_t *val)
   80 {
   81         uint8_t addr;
   82         int rv;
   83         struct iic_msg msgs[2] = {
   84                 {0, IIC_M_WR, 1, &addr},
   85                 {0, IIC_M_RD, 1, val},
   86         };
   87 
   88         msgs[0].slave = sc->bus_addr;
   89         msgs[1].slave = sc->bus_addr;
   90         addr = reg;
   91 
   92         rv = iicbus_transfer(sc->dev, msgs, 2);
   93         if (rv != 0) {
   94                 device_printf(sc->dev,
   95                     "Error when reading reg 0x%02X, rv: %d\n", reg,  rv);
   96                 return (EIO);
   97         }
   98 
   99         return (0);
  100 }
  101 
  102 int as3722_read_buf(struct as3722_softc *sc, uint8_t reg, uint8_t *buf,
  103     size_t size)
  104 {
  105         uint8_t addr;
  106         int rv;
  107         struct iic_msg msgs[2] = {
  108                 {0, IIC_M_WR, 1, &addr},
  109                 {0, IIC_M_RD, size, buf},
  110         };
  111 
  112         msgs[0].slave = sc->bus_addr;
  113         msgs[1].slave = sc->bus_addr;
  114         addr = reg;
  115 
  116         rv = iicbus_transfer(sc->dev, msgs, 2);
  117         if (rv != 0) {
  118                 device_printf(sc->dev,
  119                     "Error when reading reg 0x%02X, rv: %d\n", reg,  rv);
  120                 return (EIO);
  121         }
  122 
  123         return (0);
  124 }
  125 
  126 int
  127 as3722_write(struct as3722_softc *sc, uint8_t reg, uint8_t val)
  128 {
  129         uint8_t data[2];
  130         int rv;
  131 
  132         struct iic_msg msgs[1] = {
  133                 {0, IIC_M_WR, 2, data},
  134         };
  135 
  136         msgs[0].slave = sc->bus_addr;
  137         data[0] = reg;
  138         data[1] = val;
  139 
  140         rv = iicbus_transfer(sc->dev, msgs, 1);
  141         if (rv != 0) {
  142                 device_printf(sc->dev,
  143                     "Error when writing reg 0x%02X, rv: %d\n", reg, rv);
  144                 return (EIO);
  145         }
  146         return (0);
  147 }
  148 
  149 int as3722_write_buf(struct as3722_softc *sc, uint8_t reg, uint8_t *buf,
  150     size_t size)
  151 {
  152         uint8_t data[1];
  153         int rv;
  154         struct iic_msg msgs[2] = {
  155                 {0, IIC_M_WR, 1, data},
  156                 {0, IIC_M_WR | IIC_M_NOSTART, size, buf},
  157         };
  158 
  159         msgs[0].slave = sc->bus_addr;
  160         msgs[1].slave = sc->bus_addr;
  161         data[0] = reg;
  162 
  163         rv = iicbus_transfer(sc->dev, msgs, 2);
  164         if (rv != 0) {
  165                 device_printf(sc->dev,
  166                     "Error when writing reg 0x%02X, rv: %d\n", reg, rv);
  167                 return (EIO);
  168         }
  169         return (0);
  170 }
  171 
  172 int
  173 as3722_modify(struct as3722_softc *sc, uint8_t reg, uint8_t clear, uint8_t set)
  174 {
  175         uint8_t val;
  176         int rv;
  177 
  178         rv = as3722_read(sc, reg, &val);
  179         if (rv != 0)
  180                 return (rv);
  181 
  182         val &= ~clear;
  183         val |= set;
  184 
  185         rv = as3722_write(sc, reg, val);
  186         if (rv != 0)
  187                 return (rv);
  188 
  189         return (0);
  190 }
  191 
  192 static int
  193 as3722_get_version(struct as3722_softc *sc)
  194 {
  195         uint8_t reg;
  196         int rv;
  197 
  198         /* Verify AS3722 ID and version. */
  199         rv = RD1(sc, AS3722_ASIC_ID1, &reg);
  200         if (rv != 0)
  201                 return (ENXIO);
  202 
  203         if (reg != AS3722_DEVICE_ID) {
  204                 device_printf(sc->dev, "Invalid chip ID is 0x%x\n", reg);
  205                 return (ENXIO);
  206         }
  207 
  208         rv = RD1(sc, AS3722_ASIC_ID2, &sc->chip_rev);
  209         if (rv != 0)
  210                 return (ENXIO);
  211 
  212         if (bootverbose)
  213                 device_printf(sc->dev, "AS3722 rev: 0x%x\n", sc->chip_rev);
  214         return (0);
  215 }
  216 
  217 static int
  218 as3722_init(struct as3722_softc *sc)
  219 {
  220         uint32_t reg;
  221         int rv;
  222 
  223         reg = 0;
  224         if (sc->int_pullup)
  225                 reg |= AS3722_INT_PULL_UP;
  226         if (sc->i2c_pullup)
  227                 reg |= AS3722_I2C_PULL_UP;
  228 
  229         rv = RM1(sc, AS3722_IO_VOLTAGE,
  230             AS3722_INT_PULL_UP | AS3722_I2C_PULL_UP, reg);
  231         if (rv != 0)
  232                 return (ENXIO);
  233 
  234         /* mask interrupts */
  235         rv = WR1(sc, AS3722_INTERRUPT_MASK1, 0);
  236         if (rv != 0)
  237                 return (ENXIO);
  238         rv = WR1(sc, AS3722_INTERRUPT_MASK2, 0);
  239         if (rv != 0)
  240                 return (ENXIO);
  241         rv = WR1(sc, AS3722_INTERRUPT_MASK3, 0);
  242         if (rv != 0)
  243                 return (ENXIO);
  244         rv = WR1(sc, AS3722_INTERRUPT_MASK4, 0);
  245         if (rv != 0)
  246                 return (ENXIO);
  247         return (0);
  248 }
  249 
  250 static int
  251 as3722_parse_fdt(struct as3722_softc *sc, phandle_t node)
  252 {
  253 
  254         sc->int_pullup =
  255             OF_hasprop(node, "ams,enable-internal-int-pullup") ? 1 : 0;
  256         sc->i2c_pullup =
  257             OF_hasprop(node, "ams,enable-internal-i2c-pullup") ? 1 : 0;
  258         return 0;
  259 }
  260 
  261 static void
  262 as3722_intr(void *arg)
  263 {
  264         /* XXX Finish temperature alarms. */
  265 }
  266 
  267 static int
  268 as3722_probe(device_t dev)
  269 {
  270 
  271         if (!ofw_bus_status_okay(dev))
  272                 return (ENXIO);
  273 
  274         if (!ofw_bus_search_compatible(dev, compat_data)->ocd_data)
  275                 return (ENXIO);
  276 
  277         device_set_desc(dev, "AS3722 PMIC");
  278         return (BUS_PROBE_DEFAULT);
  279 }
  280 
  281 static int
  282 as3722_attach(device_t dev)
  283 {
  284         struct as3722_softc *sc;
  285         int rv, rid;
  286         phandle_t node;
  287 
  288         sc = device_get_softc(dev);
  289         sc->dev = dev;
  290         sc->bus_addr = iicbus_get_addr(dev);
  291         node = ofw_bus_get_node(sc->dev);
  292         rv = 0;
  293         LOCK_INIT(sc);
  294 
  295         rid = 0;
  296         sc->irq_res = bus_alloc_resource_any(dev, SYS_RES_IRQ, &rid,
  297             RF_ACTIVE);
  298         if (sc->irq_res == NULL) {
  299                 device_printf(dev, "Cannot allocate interrupt.\n");
  300                 rv = ENXIO;
  301                 goto fail;
  302         }
  303 
  304         rv = as3722_parse_fdt(sc, node);
  305         if (rv != 0)
  306                 goto fail;
  307         rv = as3722_get_version(sc);
  308         if (rv != 0)
  309                 goto fail;
  310         rv = as3722_init(sc);
  311         if (rv != 0)
  312                 goto fail;
  313         rv = as3722_regulator_attach(sc, node);
  314         if (rv != 0)
  315                 goto fail;
  316         rv = as3722_gpio_attach(sc, node);
  317         if (rv != 0)
  318                 goto fail;
  319         rv = as3722_rtc_attach(sc, node);
  320         if (rv != 0)
  321                 goto fail;
  322 
  323         fdt_pinctrl_register(dev, NULL);
  324         fdt_pinctrl_configure_by_name(dev, "default");
  325 
  326         /* Setup  interrupt. */
  327         rv = bus_setup_intr(dev, sc->irq_res, INTR_TYPE_MISC | INTR_MPSAFE,
  328             NULL, as3722_intr, sc, &sc->irq_h);
  329         if (rv) {
  330                 device_printf(dev, "Cannot setup interrupt.\n");
  331                 goto fail;
  332         }
  333         return (bus_generic_attach(dev));
  334 
  335 fail:
  336         if (sc->irq_h != NULL)
  337                 bus_teardown_intr(dev, sc->irq_res, sc->irq_h);
  338         if (sc->irq_res != NULL)
  339                 bus_release_resource(dev, SYS_RES_IRQ, 0, sc->irq_res);
  340         LOCK_DESTROY(sc);
  341         return (rv);
  342 }
  343 
  344 static int
  345 as3722_detach(device_t dev)
  346 {
  347         struct as3722_softc *sc;
  348 
  349         sc = device_get_softc(dev);
  350         if (sc->irq_h != NULL)
  351                 bus_teardown_intr(dev, sc->irq_res, sc->irq_h);
  352         if (sc->irq_res != NULL)
  353                 bus_release_resource(dev, SYS_RES_IRQ, 0, sc->irq_res);
  354         LOCK_DESTROY(sc);
  355 
  356         return (bus_generic_detach(dev));
  357 }
  358 
  359 static phandle_t
  360 as3722_gpio_get_node(device_t bus, device_t dev)
  361 {
  362 
  363         /* We only have one child, the GPIO bus, which needs our own node. */
  364         return (ofw_bus_get_node(bus));
  365 }
  366 
  367 static device_method_t as3722_methods[] = {
  368         /* Device interface */
  369         DEVMETHOD(device_probe,         as3722_probe),
  370         DEVMETHOD(device_attach,        as3722_attach),
  371         DEVMETHOD(device_detach,        as3722_detach),
  372 
  373         /* Regdev interface */
  374         DEVMETHOD(regdev_map,           as3722_regulator_map),
  375 
  376         /* RTC interface */
  377         DEVMETHOD(clock_gettime,        as3722_rtc_gettime),
  378         DEVMETHOD(clock_settime,        as3722_rtc_settime),
  379 
  380         /* GPIO protocol interface */
  381         DEVMETHOD(gpio_get_bus,         as3722_gpio_get_bus),
  382         DEVMETHOD(gpio_pin_max,         as3722_gpio_pin_max),
  383         DEVMETHOD(gpio_pin_getname,     as3722_gpio_pin_getname),
  384         DEVMETHOD(gpio_pin_getflags,    as3722_gpio_pin_getflags),
  385         DEVMETHOD(gpio_pin_getcaps,     as3722_gpio_pin_getcaps),
  386         DEVMETHOD(gpio_pin_setflags,    as3722_gpio_pin_setflags),
  387         DEVMETHOD(gpio_pin_get,         as3722_gpio_pin_get),
  388         DEVMETHOD(gpio_pin_set,         as3722_gpio_pin_set),
  389         DEVMETHOD(gpio_pin_toggle,      as3722_gpio_pin_toggle),
  390         DEVMETHOD(gpio_map_gpios,       as3722_gpio_map_gpios),
  391 
  392         /* fdt_pinctrl interface */
  393         DEVMETHOD(fdt_pinctrl_configure, as3722_pinmux_configure),
  394 
  395         /* ofw_bus interface */
  396         DEVMETHOD(ofw_bus_get_node,     as3722_gpio_get_node),
  397 
  398         DEVMETHOD_END
  399 };
  400 
  401 static DEFINE_CLASS_0(gpio, as3722_driver, as3722_methods,
  402     sizeof(struct as3722_softc));
  403 EARLY_DRIVER_MODULE(as3722, iicbus, as3722_driver, NULL, NULL, 74);
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FreeBSD/Linux Kernel Cross Reference sys/arm/nvidia/as3722.c

FreeBSD/Linux Kernel Cross Reference
sys/arm/nvidia/as3722.c
