1 /* $NetBSD: fan53555.c,v 1.10 2025/09/17 13:42:42 thorpej Exp $ */ 2 3 /*- 4 * Copyright (c) 2018 Jared McNeill <jmcneill (at) invisible.ca> 5 * All rights reserved. 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 NETBSD FOUNDATION, INC. AND CONTRIBUTORS 17 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 18 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 19 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 20 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 21 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 22 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 23 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 24 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 25 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 26 * POSSIBILITY OF SUCH DAMAGE. 27 */ 28 29 #include <sys/cdefs.h> 30 __KERNEL_RCSID(0, "$NetBSD: fan53555.c,v 1.10 2025/09/17 13:42:42 thorpej Exp $"); 31 32 #include <sys/param.h> 33 #include <sys/systm.h> 34 #include <sys/kernel.h> 35 #include <sys/device.h> 36 #include <sys/conf.h> 37 #include <sys/bus.h> 38 #include <sys/kmem.h> 39 40 #include <dev/i2c/i2cvar.h> 41 42 #include <dev/fdt/fdtvar.h> 43 44 #define VSEL0_REG 0x00 45 #define VSEL1_REG 0x01 46 #define VSEL_BUCK_EN __BIT(7) 47 #define VSEL_MODE __BIT(6) 48 #define VSEL_NSEL __BITS(5,0) 49 #define CONTROL_REG 0x02 50 #define CONTROL_OUTPUT_DISCHARGE __BIT(7) 51 #define CONTROL_SLEW __BITS(6,4) 52 #define CONTROL_RESET __BIT(2) 53 #define ID1_REG 0x03 54 #define ID1_VENDOR __BITS(7,5) 55 #define ID1_DIE_ID __BITS(3,0) 56 #define SILERGY_DIE_ID_SYR82X 8 57 #define SILERGY_DIE_ID_SYR83X 9 58 #define ID2_REG 0x04 59 #define ID2_DIE_REV __BITS(3,0) 60 #define MONITOR_REG 0x05 61 #define MONITOR_PGOOD __BIT(7) 62 63 struct fan53555_softc { 64 device_t sc_dev; 65 i2c_tag_t sc_i2c; 66 i2c_addr_t sc_addr; 67 int sc_phandle; 68 69 u_int sc_suspend_reg; 70 u_int sc_runtime_reg; 71 72 u_int sc_base; 73 u_int sc_step; 74 75 u_int sc_ramp_delay; 76 u_int sc_suspend_voltage_selector; 77 }; 78 79 enum fan53555_vendor { 80 FAN_VENDOR_FAIRCHILD = 1, 81 FAN_VENDOR_SILERGY, 82 }; 83 84 /* 85 * Transition slew rates. 86 * Array index is reg value, value is slew rate in uV / us 87 */ 88 static const int fan53555_slew_rates[] = { 89 64000, 32000, 16000, 8000, 4000, 2000, 1000, 500 90 }; 91 92 static const struct device_compatible_entry compat_data[] = { 93 { .compat = "silergy,syr827", .value = FAN_VENDOR_SILERGY }, 94 { .compat = "silergy,syr828", .value = FAN_VENDOR_SILERGY }, 95 DEVICE_COMPAT_EOL 96 }; 97 98 static uint8_t 99 fan53555_read(struct fan53555_softc *sc, uint8_t reg, int flags) 100 { 101 uint8_t val = 0; 102 int error; 103 104 error = iic_exec(sc->sc_i2c, I2C_OP_READ_WITH_STOP, sc->sc_addr, 105 ®, 1, &val, 1, flags); 106 if (error != 0) 107 aprint_error_dev(sc->sc_dev, "error reading reg %#x: %d\n", reg, error); 108 109 return val; 110 } 111 112 static void 113 fan53555_write(struct fan53555_softc *sc, uint8_t reg, uint8_t val, int flags) 114 { 115 uint8_t buf[2]; 116 int error; 117 118 buf[0] = reg; 119 buf[1] = val; 120 121 error = iic_exec(sc->sc_i2c, I2C_OP_WRITE_WITH_STOP, sc->sc_addr, 122 NULL, 0, buf, 2, flags); 123 if (error != 0) 124 aprint_error_dev(sc->sc_dev, "error writing reg %#x: %d\n", reg, error); 125 } 126 127 #define I2C_READ(sc, reg) fan53555_read((sc), (reg), 0) 128 #define I2C_WRITE(sc, reg, val) fan53555_write((sc), (reg), (val), 0) 129 #define I2C_LOCK(sc) iic_acquire_bus((sc)->sc_i2c, 0) 130 #define I2C_UNLOCK(sc) iic_release_bus((sc)->sc_i2c, 0) 131 132 static int 133 fan53555_acquire(device_t dev) 134 { 135 return 0; 136 } 137 138 static void 139 fan53555_release(device_t dev) 140 { 141 } 142 143 static int 144 fan53555_enable(device_t dev, bool enable) 145 { 146 struct fan53555_softc * const sc = device_private(dev); 147 uint8_t val; 148 149 I2C_LOCK(sc); 150 val = I2C_READ(sc, sc->sc_runtime_reg); 151 if (enable) 152 val |= VSEL_BUCK_EN; 153 else 154 val &= ~VSEL_BUCK_EN; 155 I2C_WRITE(sc, sc->sc_runtime_reg, val); 156 I2C_UNLOCK(sc); 157 158 if (sc->sc_ramp_delay) 159 delay(sc->sc_ramp_delay); 160 161 return 0; 162 } 163 164 static int 165 fan53555_set_voltage(device_t dev, u_int min_uvol, u_int max_uvol) 166 { 167 struct fan53555_softc * const sc = device_private(dev); 168 uint8_t val, oval; 169 u_int cur_uvol; 170 171 I2C_LOCK(sc); 172 173 /* Get current voltage */ 174 oval = I2C_READ(sc, sc->sc_runtime_reg); 175 cur_uvol = __SHIFTOUT(oval, VSEL_NSEL) * sc->sc_step + sc->sc_base; 176 177 /* Set new voltage */ 178 val = oval & ~VSEL_NSEL; 179 val |= __SHIFTIN((min_uvol - sc->sc_base) / sc->sc_step, VSEL_NSEL); 180 I2C_WRITE(sc, sc->sc_runtime_reg, val); 181 182 I2C_UNLOCK(sc); 183 184 /* Time to delay is based on the number of voltage steps */ 185 if (sc->sc_ramp_delay) 186 delay((abs(cur_uvol - min_uvol) / sc->sc_step) * sc->sc_ramp_delay); 187 188 return 0; 189 } 190 191 static int 192 fan53555_get_voltage(device_t dev, u_int *puvol) 193 { 194 struct fan53555_softc * const sc = device_private(dev); 195 uint8_t val; 196 197 I2C_LOCK(sc); 198 val = I2C_READ(sc, sc->sc_runtime_reg); 199 I2C_UNLOCK(sc); 200 201 *puvol = __SHIFTOUT(val, VSEL_NSEL) * sc->sc_step + sc->sc_base; 202 203 return 0; 204 } 205 206 static struct fdtbus_regulator_controller_func fan53555_funcs = { 207 .acquire = fan53555_acquire, 208 .release = fan53555_release, 209 .enable = fan53555_enable, 210 .set_voltage = fan53555_set_voltage, 211 .get_voltage = fan53555_get_voltage, 212 }; 213 214 static int 215 fan53555_init(struct fan53555_softc *sc, enum fan53555_vendor vendor) 216 { 217 uint8_t id1, control; 218 int n; 219 220 I2C_LOCK(sc); 221 id1 = I2C_READ(sc, ID1_REG); 222 I2C_UNLOCK(sc); 223 224 const u_int die_id = __SHIFTOUT(id1, ID1_DIE_ID); 225 226 aprint_naive("\n"); 227 switch (vendor) { 228 case FAN_VENDOR_SILERGY: 229 switch (die_id) { 230 case SILERGY_DIE_ID_SYR82X: 231 aprint_normal(": Silergy SYR82X\n"); 232 sc->sc_base = 712500; 233 sc->sc_step = 12500; 234 break; 235 case SILERGY_DIE_ID_SYR83X: 236 aprint_normal(": Silergy SYR83X\n"); 237 sc->sc_base = 712500; 238 sc->sc_step = 12500; 239 break; 240 default: 241 aprint_error(": Unsupported Silergy chip (0x%x)\n", die_id); 242 return ENXIO; 243 } 244 break; 245 default: 246 aprint_error(": Unsupported vendor (%d)\n", vendor); 247 return ENXIO; 248 } 249 250 sc->sc_suspend_voltage_selector = -1; 251 of_getprop_uint32(sc->sc_phandle, "fcs,suspend-voltage-selector", 252 &sc->sc_suspend_voltage_selector); 253 switch (sc->sc_suspend_voltage_selector) { 254 case 0: 255 sc->sc_suspend_reg = VSEL0_REG; 256 sc->sc_runtime_reg = VSEL1_REG; 257 break; 258 case 1: 259 sc->sc_suspend_reg = VSEL1_REG; 260 sc->sc_runtime_reg = VSEL0_REG; 261 break; 262 default: 263 aprint_error_dev(sc->sc_dev, "unsupported 'fcs,suspend-voltage-selector' value %u\n", sc->sc_suspend_voltage_selector); 264 return EINVAL; 265 } 266 267 of_getprop_uint32(sc->sc_phandle, "regulator-ramp-delay", 268 &sc->sc_ramp_delay); 269 if (sc->sc_ramp_delay) { 270 for (n = 0; n < __arraycount(fan53555_slew_rates); n++) 271 if (sc->sc_ramp_delay > fan53555_slew_rates[n]) 272 break; 273 if (n == __arraycount(fan53555_slew_rates)) { 274 aprint_error_dev(sc->sc_dev, "unsupported 'regulator-ramp-delay' value %u\n", sc->sc_ramp_delay); 275 return EINVAL; 276 } 277 I2C_LOCK(sc); 278 control = I2C_READ(sc, CONTROL_REG); 279 control &= ~CONTROL_SLEW; 280 control |= __SHIFTIN(fan53555_slew_rates[n], CONTROL_SLEW); 281 I2C_WRITE(sc, CONTROL_REG, control); 282 I2C_UNLOCK(sc); 283 } 284 285 return 0; 286 } 287 288 static int 289 fan53555_match(device_t parent, cfdata_t match, void *aux) 290 { 291 struct i2c_attach_args *ia = aux; 292 int match_result; 293 294 if (iic_use_direct_match(ia, match, compat_data, &match_result)) 295 return match_result; 296 297 return 0; 298 } 299 300 static void 301 fan53555_attach(device_t parent, device_t self, void *aux) 302 { 303 struct fan53555_softc * const sc = device_private(self); 304 const struct device_compatible_entry *compat; 305 struct i2c_attach_args *ia = aux; 306 307 sc->sc_dev = self; 308 sc->sc_i2c = ia->ia_tag; 309 sc->sc_addr = ia->ia_addr; 310 sc->sc_phandle = devhandle_to_of(device_handle(self)); 311 312 compat = iic_compatible_lookup(ia, compat_data); 313 KASSERT(compat != NULL); 314 315 if (fan53555_init(sc, compat->value) != 0) 316 return; 317 318 fdtbus_register_regulator_controller(self, sc->sc_phandle, 319 &fan53555_funcs); 320 } 321 322 CFATTACH_DECL_NEW(fan53555reg, sizeof(struct fan53555_softc), 323 fan53555_match, fan53555_attach, NULL, NULL); 324
Indexes created Sat Sep 20 22:09:52 GMT 2025