1 /*- 2 * SPDX-License-Identifier: BSD-2-Clause 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/param.h> 30 #include <sys/systm.h> 31 #include <sys/bus.h> 32 #include <sys/rman.h> 33 #include <sys/kernel.h> 34 #include <sys/reboot.h> 35 #include <sys/module.h> 36 37 #include <dev/iicbus/iicbus.h> 38 #include <dev/iicbus/iiconf.h> 39 40 #include <dev/ofw/ofw_bus.h> 41 #include <dev/ofw/ofw_bus_subr.h> 42 43 #include <dev/regulator/regulator.h> 44 45 #include "iicbus_if.h" 46 #include "regdev_if.h" 47 48 #define VSEL0 0x00 49 #define VSEL1 0x01 50 51 #define VSEL_BUCK_EN (1 << 7) 52 #define VSEL_NSEL_MASK 0x3F 53 #define VSEL_VOLTAGE_BASE 712500 /* uV */ 54 #define VSEL_VOLTAGE_STEP 12500 /* uV */ 55 56 #define ID1 0x03 57 #define ID1_VENDOR_MASK 0xE0 58 #define ID1_VENDOR_SHIFT 5 59 #define ID1_DIE_MASK 0xF 60 61 #define ID2 0x4 62 #define ID2_DIE_REV_MASK 0xF 63 64 static struct ofw_compat_data compat_data[] = { 65 { "silergy,syr827", 1 }, 66 { NULL, 0 } 67 }; 68 69 struct syr827_reg_sc { 70 struct regnode *regnode; 71 device_t base_dev; 72 phandle_t xref; 73 struct regnode_std_param *param; 74 75 int volt_reg; 76 int suspend_reg; 77 }; 78 79 struct syr827_softc { 80 uint16_t addr; 81 struct intr_config_hook intr_hook; 82 83 /* Regulator */ 84 struct syr827_reg_sc *reg; 85 }; 86 87 static int 88 syr827_read(device_t dev, uint8_t reg, uint8_t *data, uint8_t size) 89 { 90 return (iicdev_readfrom(dev, reg, data, size, IIC_INTRWAIT)); 91 } 92 93 static int 94 syr827_write(device_t dev, uint8_t reg, uint8_t val) 95 { 96 return (iicdev_writeto(dev, reg, &val, 1, IIC_INTRWAIT)); 97 } 98 99 static int 100 syr827_regnode_init(struct regnode *regnode) 101 { 102 return (0); 103 } 104 105 static int 106 syr827_regnode_enable(struct regnode *regnode, bool enable, int *udelay) 107 { 108 struct syr827_reg_sc *sc; 109 uint8_t val; 110 111 sc = regnode_get_softc(regnode); 112 113 syr827_read(sc->base_dev, sc->volt_reg, &val, 1); 114 if (enable) 115 val &= ~VSEL_BUCK_EN; 116 else 117 val |= VSEL_BUCK_EN; 118 syr827_write(sc->base_dev, sc->volt_reg, val); 119 120 *udelay = sc->param->ramp_delay; 121 122 return (0); 123 } 124 125 static int 126 syr827_regnode_set_voltage(struct regnode *regnode, int min_uvolt, 127 int max_uvolt, int *udelay) 128 { 129 struct syr827_reg_sc *sc; 130 int cur_uvolt; 131 uint8_t val; 132 133 sc = regnode_get_softc(regnode); 134 135 /* Get current voltage */ 136 syr827_read(sc->base_dev, sc->volt_reg, &val, 1); 137 cur_uvolt = (val & VSEL_NSEL_MASK) * VSEL_VOLTAGE_STEP + 138 VSEL_VOLTAGE_BASE; 139 140 /* Set new voltage */ 141 val &= ~VSEL_NSEL_MASK; 142 val |= ((min_uvolt - VSEL_VOLTAGE_BASE) / VSEL_VOLTAGE_STEP); 143 syr827_write(sc->base_dev, sc->volt_reg, val); 144 145 /* Time to delay is based on the number of voltage steps */ 146 *udelay = sc->param->ramp_delay * 147 (abs(cur_uvolt - min_uvolt) / VSEL_VOLTAGE_STEP); 148 149 return (0); 150 } 151 152 static int 153 syr827_regnode_get_voltage(struct regnode *regnode, int *uvolt) 154 { 155 struct syr827_reg_sc *sc; 156 uint8_t val; 157 158 sc = regnode_get_softc(regnode); 159 160 syr827_read(sc->base_dev, sc->volt_reg, &val, 1); 161 *uvolt = (val & VSEL_NSEL_MASK) * VSEL_VOLTAGE_STEP + 162 VSEL_VOLTAGE_BASE; 163 164 return (0); 165 } 166 167 static regnode_method_t syr827_regnode_methods[] = { 168 /* Regulator interface */ 169 REGNODEMETHOD(regnode_init, syr827_regnode_init), 170 REGNODEMETHOD(regnode_enable, syr827_regnode_enable), 171 REGNODEMETHOD(regnode_set_voltage, syr827_regnode_set_voltage), 172 REGNODEMETHOD(regnode_get_voltage, syr827_regnode_get_voltage), 173 REGNODEMETHOD_END 174 }; 175 DEFINE_CLASS_1(syr827_regnode, syr827_regnode_class, syr827_regnode_methods, 176 sizeof(struct syr827_reg_sc), regnode_class); 177 178 static struct syr827_reg_sc * 179 syr827_reg_attach(device_t dev, phandle_t node) 180 { 181 struct syr827_reg_sc *reg_sc; 182 struct regnode_init_def initdef; 183 struct regnode *regnode; 184 int suspend_reg; 185 186 memset(&initdef, 0, sizeof(initdef)); 187 regulator_parse_ofw_stdparam(dev, node, &initdef); 188 initdef.id = 0; 189 initdef.ofw_node = node; 190 regnode = regnode_create(dev, &syr827_regnode_class, &initdef); 191 if (regnode == NULL) { 192 device_printf(dev, "cannot create regulator\n"); 193 return (NULL); 194 } 195 196 reg_sc = regnode_get_softc(regnode); 197 reg_sc->regnode = regnode; 198 reg_sc->base_dev = dev; 199 reg_sc->xref = OF_xref_from_node(node); 200 reg_sc->param = regnode_get_stdparam(regnode); 201 202 if (OF_getencprop(node, "fcs,suspend-voltage-selector", &suspend_reg, 203 sizeof(uint32_t)) <= 0) 204 suspend_reg = 0; 205 206 switch (suspend_reg) { 207 case 0: 208 reg_sc->suspend_reg = VSEL0; 209 reg_sc->volt_reg = VSEL1; 210 break; 211 case 1: 212 reg_sc->suspend_reg = VSEL1; 213 reg_sc->volt_reg = VSEL0; 214 break; 215 } 216 217 regnode_register(regnode); 218 219 return (reg_sc); 220 } 221 222 static int 223 syr827_regdev_map(device_t dev, phandle_t xref, int ncells, pcell_t *cells, 224 intptr_t *num) 225 { 226 struct syr827_softc *sc; 227 228 sc = device_get_softc(dev); 229 230 if (sc->reg->xref != xref) 231 return (ENXIO); 232 233 *num = 0; 234 235 return (0); 236 } 237 238 static int 239 syr827_probe(device_t dev) 240 { 241 if (!ofw_bus_status_okay(dev)) 242 return (ENXIO); 243 244 if (ofw_bus_search_compatible(dev, compat_data)->ocd_data == 0) 245 return (ENXIO); 246 247 device_set_desc(dev, "Silergy SYR827 regulator"); 248 249 return (BUS_PROBE_DEFAULT); 250 } 251 252 static void 253 syr827_start(void *pdev) 254 { 255 struct syr827_softc *sc; 256 device_t dev; 257 uint8_t val; 258 259 dev = pdev; 260 sc = device_get_softc(dev); 261 262 if (bootverbose) { 263 syr827_read(dev, ID1, &val, 1); 264 device_printf(dev, "Vendor ID: %x, DIE ID: %x\n", 265 (val & ID1_VENDOR_MASK) >> ID1_VENDOR_SHIFT, 266 val & ID1_DIE_MASK); 267 syr827_read(dev, ID2, &val, 1); 268 device_printf(dev, "DIE Rev: %x\n", val & ID2_DIE_REV_MASK); 269 } 270 271 config_intrhook_disestablish(&sc->intr_hook); 272 } 273 274 static int 275 syr827_attach(device_t dev) 276 { 277 struct syr827_softc *sc; 278 phandle_t node; 279 280 sc = device_get_softc(dev); 281 node = ofw_bus_get_node(dev); 282 283 sc->addr = iicbus_get_addr(dev); 284 285 sc->intr_hook.ich_func = syr827_start; 286 sc->intr_hook.ich_arg = dev; 287 288 if (config_intrhook_establish(&sc->intr_hook) != 0) 289 return (ENOMEM); 290 291 sc->reg = syr827_reg_attach(dev, node); 292 if (sc->reg == NULL) { 293 device_printf(dev, "cannot attach regulator\n"); 294 return (ENXIO); 295 } 296 297 return (0); 298 } 299 300 static device_method_t syr827_methods[] = { 301 /* Device interface */ 302 DEVMETHOD(device_probe, syr827_probe), 303 DEVMETHOD(device_attach, syr827_attach), 304 305 /* Regdev interface */ 306 DEVMETHOD(regdev_map, syr827_regdev_map), 307 308 DEVMETHOD_END 309 }; 310 311 static driver_t syr827_driver = { 312 "syr827", 313 syr827_methods, 314 sizeof(struct syr827_softc), 315 }; 316 317 EARLY_DRIVER_MODULE(syr827, iicbus, syr827_driver, 0, 0, BUS_PASS_RESOURCE); 318 MODULE_VERSION(syr827, 1); 319 MODULE_DEPEND(syr827, iicbus, 1, 1, 1); 320 IICBUS_FDT_PNP_INFO(compat_data); 321