sy8106a.c

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    1 /*-
    2  * Copyright (c) 2016 Jared McNeill <jmcneill@invisible.ca>
    3  *
    4  * Redistribution and use in source and binary forms, with or without
    5  * modification, are permitted provided that the following conditions
    6  * are met:
    7  * 1. Redistributions of source code must retain the above copyright
    8  *    notice, this list of conditions and the following disclaimer.
    9  * 2. Redistributions in binary form must reproduce the above copyright
   10  *    notice, this list of conditions and the following disclaimer in the
   11  *    documentation and/or other materials provided with the distribution.
   12  *
   13  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
   14  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
   15  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
   16  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
   17  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
   18  * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
   19  * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
   20  * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
   21  * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   22  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   23  * SUCH DAMAGE.
   24  *
   25  * $FreeBSD$
   26  */
   27 
   28 /*
   29  * Silergy Corp. SY8106A buck regulator
   30  */
   31 
   32 #include <sys/cdefs.h>
   33 __FBSDID("$FreeBSD$");
   34 
   35 #include <sys/param.h>
   36 #include <sys/systm.h>
   37 #include <sys/bus.h>
   38 #include <sys/rman.h>
   39 #include <sys/kernel.h>
   40 #include <sys/reboot.h>
   41 #include <sys/module.h>
   42 
   43 #include <dev/iicbus/iicbus.h>
   44 #include <dev/iicbus/iiconf.h>
   45 
   46 #include <dev/ofw/ofw_bus.h>
   47 #include <dev/ofw/ofw_bus_subr.h>
   48 
   49 #include <dev/extres/regulator/regulator.h>
   50 
   51 #include "iicbus_if.h"
   52 #include "regdev_if.h"
   53 
   54 #define VOUT1_SEL               0x01
   55 #define  SEL_GO                 (1 << 7)
   56 #define  SEL_VOLTAGE_MASK       0x7f
   57 #define  SEL_VOLTAGE_BASE       680000  /* uV */
   58 #define  SEL_VOLTAGE_STEP       10000   /* uV */
   59 #define VOUT_COM                0x02
   60 #define  COM_DISABLE            (1 << 0)
   61 #define SYS_STATUS              0x06
   62 
   63 static struct ofw_compat_data compat_data[] = {
   64         { "silergy,sy8106a",                    1 },
   65         { NULL,                                 0 }
   66 };
   67 
   68 struct sy8106a_reg_sc {
   69         struct regnode          *regnode;
   70         device_t                base_dev;
   71         phandle_t               xref;
   72         struct regnode_std_param *param;
   73 };
   74 
   75 struct sy8106a_softc {
   76         uint16_t                addr;
   77 
   78         /* Regulator */
   79         struct sy8106a_reg_sc   *reg;
   80 };
   81 
   82 static int
   83 sy8106a_read(device_t dev, uint8_t reg, uint8_t *data, uint8_t size)
   84 {
   85         struct sy8106a_softc *sc;
   86         struct iic_msg msg[2];
   87 
   88         sc = device_get_softc(dev);
   89 
   90         msg[0].slave = sc->addr;
   91         msg[0].flags = IIC_M_WR;
   92         msg[0].len = 1;
   93         msg[0].buf = &reg;
   94 
   95         msg[1].slave = sc->addr;
   96         msg[1].flags = IIC_M_RD;
   97         msg[1].len = size;
   98         msg[1].buf = data;
   99 
  100         return (iicbus_transfer(dev, msg, 2));
  101 }
  102 
  103 static int
  104 sy8106a_write(device_t dev, uint8_t reg, uint8_t val)
  105 {
  106         struct sy8106a_softc *sc;
  107         struct iic_msg msg;
  108         uint8_t buffer[2];
  109 
  110         sc = device_get_softc(dev);
  111 
  112         buffer[0] = reg;
  113         buffer[1] = val;
  114 
  115         msg.slave = sc->addr;
  116         msg.flags = IIC_M_WR;
  117         msg.len = 2;
  118         msg.buf = buffer;
  119 
  120         return (iicbus_transfer(dev, &msg, 1));
  121 }
  122 
  123 static int
  124 sy8106a_regnode_init(struct regnode *regnode)
  125 {
  126         return (0);
  127 }
  128 
  129 static int
  130 sy8106a_regnode_enable(struct regnode *regnode, bool enable, int *udelay)
  131 {
  132         struct sy8106a_reg_sc *sc;
  133         uint8_t val;
  134 
  135         sc = regnode_get_softc(regnode);
  136 
  137         sy8106a_read(sc->base_dev, VOUT_COM, &val, 1);
  138         if (enable)
  139                 val &= ~COM_DISABLE;
  140         else
  141                 val |= COM_DISABLE;
  142         sy8106a_write(sc->base_dev, VOUT_COM, val);
  143 
  144         *udelay = sc->param->ramp_delay;
  145 
  146         return (0);
  147 }
  148 
  149 static int
  150 sy8106a_regnode_set_voltage(struct regnode *regnode, int min_uvolt,
  151     int max_uvolt, int *udelay)
  152 {
  153         struct sy8106a_reg_sc *sc;
  154         int cur_uvolt;
  155         uint8_t val, oval;
  156 
  157         sc = regnode_get_softc(regnode);
  158 
  159         /* Get current voltage */
  160         sy8106a_read(sc->base_dev, VOUT1_SEL, &oval, 1);
  161         cur_uvolt = (oval & SEL_VOLTAGE_MASK) * SEL_VOLTAGE_STEP +
  162             SEL_VOLTAGE_BASE;
  163 
  164         /* Set new voltage */
  165         val = SEL_GO | ((min_uvolt - SEL_VOLTAGE_BASE) / SEL_VOLTAGE_STEP);
  166         sy8106a_write(sc->base_dev, VOUT1_SEL, val);
  167 
  168         /* Time to delay is based on the number of voltage steps */
  169         *udelay = sc->param->ramp_delay *
  170             (abs(cur_uvolt - min_uvolt) / SEL_VOLTAGE_STEP);
  171 
  172         return (0);
  173 }
  174 
  175 static int
  176 sy8106a_regnode_get_voltage(struct regnode *regnode, int *uvolt)
  177 {
  178         struct sy8106a_reg_sc *sc;
  179         uint8_t val;
  180 
  181         sc = regnode_get_softc(regnode);
  182 
  183         sy8106a_read(sc->base_dev, VOUT1_SEL, &val, 1);
  184         *uvolt = (val & SEL_VOLTAGE_MASK) * SEL_VOLTAGE_STEP +
  185             SEL_VOLTAGE_BASE;
  186 
  187         return (0);
  188 }
  189 
  190 static regnode_method_t sy8106a_regnode_methods[] = {
  191         /* Regulator interface */
  192         REGNODEMETHOD(regnode_init,             sy8106a_regnode_init),
  193         REGNODEMETHOD(regnode_enable,           sy8106a_regnode_enable),
  194         REGNODEMETHOD(regnode_set_voltage,      sy8106a_regnode_set_voltage),
  195         REGNODEMETHOD(regnode_get_voltage,      sy8106a_regnode_get_voltage),
  196         REGNODEMETHOD_END
  197 };
  198 DEFINE_CLASS_1(sy8106a_regnode, sy8106a_regnode_class, sy8106a_regnode_methods,
  199     sizeof(struct sy8106a_reg_sc), regnode_class);
  200 
  201 static struct sy8106a_reg_sc *
  202 sy8106a_reg_attach(device_t dev, phandle_t node)
  203 {
  204         struct sy8106a_reg_sc *reg_sc;
  205         struct regnode_init_def initdef;
  206         struct regnode *regnode;
  207 
  208         memset(&initdef, 0, sizeof(initdef));
  209         regulator_parse_ofw_stdparam(dev, node, &initdef);
  210         initdef.id = 0;
  211         initdef.ofw_node = node;
  212         regnode = regnode_create(dev, &sy8106a_regnode_class, &initdef);
  213         if (regnode == NULL) {
  214                 device_printf(dev, "cannot create regulator\n");
  215                 return (NULL);
  216         }
  217 
  218         reg_sc = regnode_get_softc(regnode);
  219         reg_sc->regnode = regnode;
  220         reg_sc->base_dev = dev;
  221         reg_sc->xref = OF_xref_from_node(node);
  222         reg_sc->param = regnode_get_stdparam(regnode);
  223 
  224         regnode_register(regnode);
  225 
  226         return (reg_sc);
  227 }
  228 
  229 static int
  230 sy8106a_regdev_map(device_t dev, phandle_t xref, int ncells, pcell_t *cells,
  231     intptr_t *num)
  232 {
  233         struct sy8106a_softc *sc;
  234 
  235         sc = device_get_softc(dev);
  236 
  237         if (sc->reg->xref != xref)
  238                 return (ENXIO);
  239 
  240         *num = 0;
  241 
  242         return (0);
  243 }
  244 
  245 static int
  246 sy8106a_probe(device_t dev)
  247 {
  248         if (!ofw_bus_status_okay(dev))
  249                 return (ENXIO);
  250 
  251         if (ofw_bus_search_compatible(dev, compat_data)->ocd_data == 0)
  252                 return (ENXIO);
  253 
  254         device_set_desc(dev, "Silergy SY8106A regulator");
  255 
  256         return (BUS_PROBE_DEFAULT);
  257 }
  258 
  259 static int
  260 sy8106a_attach(device_t dev)
  261 {
  262         struct sy8106a_softc *sc;
  263         phandle_t node;
  264 
  265         sc = device_get_softc(dev);
  266         node = ofw_bus_get_node(dev);
  267 
  268         sc->addr = iicbus_get_addr(dev);
  269 
  270         sc->reg = sy8106a_reg_attach(dev, node);
  271         if (sc->reg == NULL) {
  272                 device_printf(dev, "cannot attach regulator\n");
  273                 return (ENXIO);
  274         }
  275 
  276         return (0);
  277 }
  278 
  279 static device_method_t sy8106a_methods[] = {
  280         /* Device interface */
  281         DEVMETHOD(device_probe,         sy8106a_probe),
  282         DEVMETHOD(device_attach,        sy8106a_attach),
  283 
  284         /* Regdev interface */
  285         DEVMETHOD(regdev_map,           sy8106a_regdev_map),
  286 
  287         DEVMETHOD_END
  288 };
  289 
  290 static driver_t sy8106a_driver = {
  291         "sy8106a",
  292         sy8106a_methods,
  293         sizeof(struct sy8106a_softc),
  294 };
  295 
  296 EARLY_DRIVER_MODULE(sy8106a, iicbus, sy8106a_driver, 0, 0, BUS_PASS_RESOURCE);
  297 MODULE_VERSION(sy8106a, 1);
  298 MODULE_DEPEND(sy8106a, iicbus, 1, 1, 1);
  299 IICBUS_FDT_PNP_INFO(compat_data);

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FreeBSD/Linux Kernel Cross Reference sys/dev/iicbus/sy8106a.c

FreeBSD/Linux Kernel Cross Reference
sys/dev/iicbus/sy8106a.c