syr827.c

Version: - FREEBSD - FREEBSD-13-STABLE - FREEBSD-13-0 - FREEBSD-12-STABLE - FREEBSD-12-0 - FREEBSD-11-STABLE - FREEBSD-11-0 - FREEBSD-10-STABLE - FREEBSD-10-0 - FREEBSD-9-STABLE - FREEBSD-9-0 - FREEBSD-8-STABLE - FREEBSD-8-0 - FREEBSD-7-STABLE - FREEBSD-7-0 - FREEBSD-6-STABLE - FREEBSD-6-0 - FREEBSD-5-STABLE - FREEBSD-5-0 - FREEBSD-4-STABLE - FREEBSD-3-STABLE - FREEBSD22 - l41 - OPENBSD - linux-2.6 - MK84 - PLAN9 - xnu-8792
SearchContext: - none - 3 - 10
    1 /*-
    2  * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
    3  *
    4  * Copyright (c) 2016 Jared McNeill <jmcneill@invisible.ca>
    5  * Copyright (c) 2018 Emmanuel Vadot <manu@FreeBSD.org>
    6  *
    7  * Redistribution and use in source and binary forms, with or without
    8  * modification, are permitted provided that the following conditions
    9  * are met:
   10  * 1. Redistributions of source code must retain the above copyright
   11  *    notice, this list of conditions and the following 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 #include <sys/rman.h>
   36 #include <sys/kernel.h>
   37 #include <sys/reboot.h>
   38 #include <sys/module.h>
   39 
   40 #include <dev/iicbus/iicbus.h>
   41 #include <dev/iicbus/iiconf.h>
   42 
   43 #include <dev/ofw/ofw_bus.h>
   44 #include <dev/ofw/ofw_bus_subr.h>
   45 
   46 #include <dev/extres/regulator/regulator.h>
   47 
   48 #include "iicbus_if.h"
   49 #include "regdev_if.h"
   50 
   51 #define VSEL0   0x00
   52 #define VSEL1   0x01
   53 
   54 #define VSEL_BUCK_EN    (1 << 7)
   55 #define VSEL_NSEL_MASK  0x3F
   56 #define VSEL_VOLTAGE_BASE       712500 /* uV */
   57 #define VSEL_VOLTAGE_STEP       12500  /* uV */
   58 
   59 #define ID1     0x03
   60 #define  ID1_VENDOR_MASK        0xE0
   61 #define  ID1_VENDOR_SHIFT       5
   62 #define  ID1_DIE_MASK           0xF
   63 
   64 #define ID2     0x4
   65 #define  ID2_DIE_REV_MASK       0xF
   66 
   67 static struct ofw_compat_data compat_data[] = {
   68         { "silergy,syr827",                     1 },
   69         { NULL,                                 0 }
   70 };
   71 
   72 struct syr827_reg_sc {
   73         struct regnode          *regnode;
   74         device_t                base_dev;
   75         phandle_t               xref;
   76         struct regnode_std_param *param;
   77 
   78         int                     volt_reg;
   79         int                     suspend_reg;
   80 };
   81 
   82 struct syr827_softc {
   83         uint16_t                addr;
   84         struct intr_config_hook intr_hook;
   85 
   86         /* Regulator */
   87         struct syr827_reg_sc    *reg;
   88 };
   89 
   90 static int
   91 syr827_read(device_t dev, uint8_t reg, uint8_t *data, uint8_t size)
   92 {
   93         return (iicdev_readfrom(dev, reg, data, size, IIC_INTRWAIT));
   94 }
   95 
   96 static int
   97 syr827_write(device_t dev, uint8_t reg, uint8_t val)
   98 {
   99         return (iicdev_writeto(dev, reg, &val, 1, IIC_INTRWAIT));
  100 }
  101 
  102 static int
  103 syr827_regnode_init(struct regnode *regnode)
  104 {
  105         return (0);
  106 }
  107 
  108 static int
  109 syr827_regnode_enable(struct regnode *regnode, bool enable, int *udelay)
  110 {
  111         struct syr827_reg_sc *sc;
  112         uint8_t val;
  113 
  114         sc = regnode_get_softc(regnode);
  115 
  116         syr827_read(sc->base_dev, sc->volt_reg, &val, 1);
  117         if (enable)
  118                 val &= ~VSEL_BUCK_EN;
  119         else
  120                 val |= VSEL_BUCK_EN;
  121         syr827_write(sc->base_dev, sc->volt_reg, val);
  122 
  123         *udelay = sc->param->ramp_delay;
  124 
  125         return (0);
  126 }
  127 
  128 static int
  129 syr827_regnode_set_voltage(struct regnode *regnode, int min_uvolt,
  130     int max_uvolt, int *udelay)
  131 {
  132         struct syr827_reg_sc *sc;
  133         int cur_uvolt;
  134         uint8_t val;
  135 
  136         sc = regnode_get_softc(regnode);
  137 
  138         /* Get current voltage */
  139         syr827_read(sc->base_dev, sc->volt_reg, &val, 1);
  140         cur_uvolt = (val & VSEL_NSEL_MASK) * VSEL_VOLTAGE_STEP +
  141             VSEL_VOLTAGE_BASE;
  142 
  143         /* Set new voltage */
  144         val &= ~VSEL_NSEL_MASK;
  145         val |= ((min_uvolt - VSEL_VOLTAGE_BASE) / VSEL_VOLTAGE_STEP);
  146         syr827_write(sc->base_dev, sc->volt_reg, val);
  147 
  148         /* Time to delay is based on the number of voltage steps */
  149         *udelay = sc->param->ramp_delay *
  150             (abs(cur_uvolt - min_uvolt) / VSEL_VOLTAGE_STEP);
  151 
  152         return (0);
  153 }
  154 
  155 static int
  156 syr827_regnode_get_voltage(struct regnode *regnode, int *uvolt)
  157 {
  158         struct syr827_reg_sc *sc;
  159         uint8_t val;
  160 
  161         sc = regnode_get_softc(regnode);
  162 
  163         syr827_read(sc->base_dev, sc->volt_reg, &val, 1);
  164         *uvolt = (val & VSEL_NSEL_MASK) * VSEL_VOLTAGE_STEP +
  165             VSEL_VOLTAGE_BASE;
  166 
  167         return (0);
  168 }
  169 
  170 static regnode_method_t syr827_regnode_methods[] = {
  171         /* Regulator interface */
  172         REGNODEMETHOD(regnode_init,             syr827_regnode_init),
  173         REGNODEMETHOD(regnode_enable,           syr827_regnode_enable),
  174         REGNODEMETHOD(regnode_set_voltage,      syr827_regnode_set_voltage),
  175         REGNODEMETHOD(regnode_get_voltage,      syr827_regnode_get_voltage),
  176         REGNODEMETHOD_END
  177 };
  178 DEFINE_CLASS_1(syr827_regnode, syr827_regnode_class, syr827_regnode_methods,
  179     sizeof(struct syr827_reg_sc), regnode_class);
  180 
  181 static struct syr827_reg_sc *
  182 syr827_reg_attach(device_t dev, phandle_t node)
  183 {
  184         struct syr827_reg_sc *reg_sc;
  185         struct regnode_init_def initdef;
  186         struct regnode *regnode;
  187         int suspend_reg;
  188 
  189         memset(&initdef, 0, sizeof(initdef));
  190         regulator_parse_ofw_stdparam(dev, node, &initdef);
  191         initdef.id = 0;
  192         initdef.ofw_node = node;
  193         regnode = regnode_create(dev, &syr827_regnode_class, &initdef);
  194         if (regnode == NULL) {
  195                 device_printf(dev, "cannot create regulator\n");
  196                 return (NULL);
  197         }
  198 
  199         reg_sc = regnode_get_softc(regnode);
  200         reg_sc->regnode = regnode;
  201         reg_sc->base_dev = dev;
  202         reg_sc->xref = OF_xref_from_node(node);
  203         reg_sc->param = regnode_get_stdparam(regnode);
  204 
  205         if (OF_getencprop(node, "fcs,suspend-voltage-selector", &suspend_reg,
  206             sizeof(uint32_t)) <= 0)
  207                 suspend_reg = 0;
  208 
  209         switch (suspend_reg) {
  210         case 0:
  211                 reg_sc->suspend_reg = VSEL0;
  212                 reg_sc->volt_reg = VSEL1;
  213                 break;
  214         case 1:
  215                 reg_sc->suspend_reg = VSEL1;
  216                 reg_sc->volt_reg = VSEL0;
  217                 break;
  218         }
  219 
  220         regnode_register(regnode);
  221 
  222         return (reg_sc);
  223 }
  224 
  225 static int
  226 syr827_regdev_map(device_t dev, phandle_t xref, int ncells, pcell_t *cells,
  227     intptr_t *num)
  228 {
  229         struct syr827_softc *sc;
  230 
  231         sc = device_get_softc(dev);
  232 
  233         if (sc->reg->xref != xref)
  234                 return (ENXIO);
  235 
  236         *num = 0;
  237 
  238         return (0);
  239 }
  240 
  241 static int
  242 syr827_probe(device_t dev)
  243 {
  244         if (!ofw_bus_status_okay(dev))
  245                 return (ENXIO);
  246 
  247         if (ofw_bus_search_compatible(dev, compat_data)->ocd_data == 0)
  248                 return (ENXIO);
  249 
  250         device_set_desc(dev, "Silergy SYR827 regulator");
  251 
  252         return (BUS_PROBE_DEFAULT);
  253 }
  254 
  255 static void
  256 syr827_start(void *pdev)
  257 {
  258         struct syr827_softc *sc;
  259         device_t dev;
  260         uint8_t val;
  261 
  262         dev = pdev;
  263         sc = device_get_softc(dev);
  264 
  265         if (bootverbose) {
  266                 syr827_read(dev, ID1, &val, 1);
  267                 device_printf(dev, "Vendor ID: %x, DIE ID: %x\n",
  268                     (val & ID1_VENDOR_MASK) >> ID1_VENDOR_SHIFT,
  269                     val & ID1_DIE_MASK);
  270                 syr827_read(dev, ID2, &val, 1);
  271                 device_printf(dev, "DIE Rev: %x\n", val & ID2_DIE_REV_MASK);
  272         }
  273 
  274         config_intrhook_disestablish(&sc->intr_hook);
  275 }
  276 
  277 static int
  278 syr827_attach(device_t dev)
  279 {
  280         struct syr827_softc *sc;
  281         phandle_t node;
  282 
  283         sc = device_get_softc(dev);
  284         node = ofw_bus_get_node(dev);
  285 
  286         sc->addr = iicbus_get_addr(dev);
  287 
  288         sc->intr_hook.ich_func = syr827_start;
  289         sc->intr_hook.ich_arg = dev;
  290 
  291         if (config_intrhook_establish(&sc->intr_hook) != 0)
  292                 return (ENOMEM);
  293 
  294         sc->reg = syr827_reg_attach(dev, node);
  295         if (sc->reg == NULL) {
  296                 device_printf(dev, "cannot attach regulator\n");
  297                 return (ENXIO);
  298         }
  299 
  300         return (0);
  301 }
  302 
  303 static device_method_t syr827_methods[] = {
  304         /* Device interface */
  305         DEVMETHOD(device_probe,         syr827_probe),
  306         DEVMETHOD(device_attach,        syr827_attach),
  307 
  308         /* Regdev interface */
  309         DEVMETHOD(regdev_map,           syr827_regdev_map),
  310 
  311         DEVMETHOD_END
  312 };
  313 
  314 static driver_t syr827_driver = {
  315         "syr827",
  316         syr827_methods,
  317         sizeof(struct syr827_softc),
  318 };
  319 
  320 EARLY_DRIVER_MODULE(syr827, iicbus, syr827_driver, 0, 0, BUS_PASS_RESOURCE);
  321 MODULE_VERSION(syr827, 1);
  322 MODULE_DEPEND(syr827, iicbus, 1, 1, 1);
  323 IICBUS_FDT_PNP_INFO(compat_data);
Cache object: 4e19fc1bc3ff239fa3c8922884b32590
[ source navigation ] [ diff markup ] [ identifier search ] [ freetext search ] [ file search ] [ list types ] [ track identifier ]
This page is part of the FreeBSD/Linux Linux Kernel Cross-Reference, and was automatically generated using a modified version of the LXR engine.
FreeBSD/Linux Kernel Cross Reference sys/dev/iicbus/syr827.c

FreeBSD/Linux Kernel Cross Reference
sys/dev/iicbus/syr827.c
