fan53555.c revision 1.6
1 /* $NetBSD: fan53555.c,v 1.6 2021/01/17 21:56:20 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 1.6 2021/01/17 21:56:20 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 96 { 0 } 97 }; 98 99 static uint8_t 100 fan53555_read(struct fan53555_softc *sc, uint8_t reg, int flags) 101 { 102 uint8_t val = 0; 103 int error; 104 105 error = iic_exec(sc->sc_i2c, I2C_OP_READ_WITH_STOP, sc->sc_addr, 106 ®, 1, &val, 1, flags); 107 if (error != 0) 108 aprint_error_dev(sc->sc_dev, "error reading reg %#x: %d\n", reg, error); 109 110 return val; 111 } 112 113 static void 114 fan53555_write(struct fan53555_softc *sc, uint8_t reg, uint8_t val, int flags) 115 { 116 uint8_t buf[2]; 117 int error; 118 119 buf[0] = reg; 120 buf[1] = val; 121 122 error = iic_exec(sc->sc_i2c, I2C_OP_WRITE_WITH_STOP, sc->sc_addr, 123 NULL, 0, buf, 2, flags); 124 if (error != 0) 125 aprint_error_dev(sc->sc_dev, "error writing reg %#x: %d\n", reg, error); 126 } 127 128 #define I2C_READ(sc, reg) fan53555_read((sc), (reg), 0) 129 #define I2C_WRITE(sc, reg, val) fan53555_write((sc), (reg), (val), 0) 130 #define I2C_LOCK(sc) iic_acquire_bus((sc)->sc_i2c, 0) 131 #define I2C_UNLOCK(sc) iic_release_bus((sc)->sc_i2c, 0) 132 133 static int 134 fan53555_acquire(device_t dev) 135 { 136 return 0; 137 } 138 139 static void 140 fan53555_release(device_t dev) 141 { 142 } 143 144 static int 145 fan53555_enable(device_t dev, bool enable) 146 { 147 struct fan53555_softc * const sc = device_private(dev); 148 uint8_t val; 149 150 I2C_LOCK(sc); 151 val = I2C_READ(sc, sc->sc_runtime_reg); 152 if (enable) 153 val |= VSEL_BUCK_EN; 154 else 155 val &= ~VSEL_BUCK_EN; 156 I2C_WRITE(sc, sc->sc_runtime_reg, val); 157 I2C_UNLOCK(sc); 158 159 if (sc->sc_ramp_delay) 160 delay(sc->sc_ramp_delay); 161 162 return 0; 163 } 164 165 static int 166 fan53555_set_voltage(device_t dev, u_int min_uvol, u_int max_uvol) 167 { 168 struct fan53555_softc * const sc = device_private(dev); 169 uint8_t val, oval; 170 u_int cur_uvol; 171 172 I2C_LOCK(sc); 173 174 /* Get current voltage */ 175 oval = I2C_READ(sc, sc->sc_runtime_reg); 176 cur_uvol = __SHIFTOUT(oval, VSEL_NSEL) * sc->sc_step + sc->sc_base; 177 178 /* Set new voltage */ 179 val = oval & ~VSEL_NSEL; 180 val |= __SHIFTIN((min_uvol - sc->sc_base) / sc->sc_step, VSEL_NSEL); 181 I2C_WRITE(sc, sc->sc_runtime_reg, val); 182 183 I2C_UNLOCK(sc); 184 185 /* Time to delay is based on the number of voltage steps */ 186 if (sc->sc_ramp_delay) 187 delay((abs(cur_uvol - min_uvol) / sc->sc_step) * sc->sc_ramp_delay); 188 189 return 0; 190 } 191 192 static int 193 fan53555_get_voltage(device_t dev, u_int *puvol) 194 { 195 struct fan53555_softc * const sc = device_private(dev); 196 uint8_t val; 197 198 I2C_LOCK(sc); 199 val = I2C_READ(sc, sc->sc_runtime_reg); 200 I2C_UNLOCK(sc); 201 202 *puvol = __SHIFTOUT(val, VSEL_NSEL) * sc->sc_step + sc->sc_base; 203 204 return 0; 205 } 206 207 static struct fdtbus_regulator_controller_func fan53555_funcs = { 208 .acquire = fan53555_acquire, 209 .release = fan53555_release, 210 .enable = fan53555_enable, 211 .set_voltage = fan53555_set_voltage, 212 .get_voltage = fan53555_get_voltage, 213 }; 214 215 static int 216 fan53555_init(struct fan53555_softc *sc, enum fan53555_vendor vendor) 217 { 218 uint8_t id1, control; 219 int n; 220 221 I2C_LOCK(sc); 222 id1 = I2C_READ(sc, ID1_REG); 223 I2C_UNLOCK(sc); 224 225 const u_int die_id = __SHIFTOUT(id1, ID1_DIE_ID); 226 227 aprint_naive("\n"); 228 switch (vendor) { 229 case FAN_VENDOR_SILERGY: 230 switch (die_id) { 231 case SILERGY_DIE_ID_SYR82X: 232 aprint_normal(": Silergy SYR82X\n"); 233 sc->sc_base = 712500; 234 sc->sc_step = 12500; 235 break; 236 case SILERGY_DIE_ID_SYR83X: 237 aprint_normal(": Silergy SYR83X\n"); 238 sc->sc_base = 712500; 239 sc->sc_step = 12500; 240 break; 241 default: 242 aprint_error(": Unsupported Silergy chip (0x%x)\n", die_id); 243 return ENXIO; 244 } 245 break; 246 default: 247 aprint_error(": Unsupported vendor (%d)\n", vendor); 248 return ENXIO; 249 } 250 251 sc->sc_suspend_voltage_selector = -1; 252 of_getprop_uint32(sc->sc_phandle, "fcs,suspend-voltage-selector", 253 &sc->sc_suspend_voltage_selector); 254 switch (sc->sc_suspend_voltage_selector) { 255 case 0: 256 sc->sc_suspend_reg = VSEL0_REG; 257 sc->sc_runtime_reg = VSEL1_REG; 258 break; 259 case 1: 260 sc->sc_suspend_reg = VSEL1_REG; 261 sc->sc_runtime_reg = VSEL0_REG; 262 break; 263 default: 264 aprint_error_dev(sc->sc_dev, "unsupported 'fcs,suspend-voltage-selector' value %u\n", sc->sc_suspend_voltage_selector); 265 return EINVAL; 266 } 267 268 of_getprop_uint32(sc->sc_phandle, "regulator-ramp-delay", 269 &sc->sc_ramp_delay); 270 if (sc->sc_ramp_delay) { 271 for (n = 0; n < __arraycount(fan53555_slew_rates); n++) 272 if (sc->sc_ramp_delay > fan53555_slew_rates[n]) 273 break; 274 if (n == __arraycount(fan53555_slew_rates)) { 275 aprint_error_dev(sc->sc_dev, "unsupported 'regulator-ramp-delay' value %u\n", sc->sc_ramp_delay); 276 return EINVAL; 277 } 278 I2C_LOCK(sc); 279 control = I2C_READ(sc, CONTROL_REG); 280 control &= ~CONTROL_SLEW; 281 control |= __SHIFTIN(fan53555_slew_rates[n], CONTROL_SLEW); 282 I2C_WRITE(sc, CONTROL_REG, control); 283 I2C_UNLOCK(sc); 284 } 285 286 return 0; 287 } 288 289 static int 290 fan53555_match(device_t parent, cfdata_t match, void *aux) 291 { 292 struct i2c_attach_args *ia = aux; 293 int match_result; 294 295 if (iic_use_direct_match(ia, match, compat_data, &match_result)) 296 return match_result; 297 298 return 0; 299 } 300 301 static void 302 fan53555_attach(device_t parent, device_t self, void *aux) 303 { 304 struct fan53555_softc * const sc = device_private(self); 305 const struct device_compatible_entry *compat; 306 struct i2c_attach_args *ia = aux; 307 308 sc->sc_dev = self; 309 sc->sc_i2c = ia->ia_tag; 310 sc->sc_addr = ia->ia_addr; 311 sc->sc_phandle = ia->ia_cookie; 312 313 iic_compatible_match(ia, compat_data, &compat); 314 KASSERT(compat != NULL); 315 316 if (fan53555_init(sc, compat->value) != 0) 317 return; 318 319 fdtbus_register_regulator_controller(self, sc->sc_phandle, 320 &fan53555_funcs); 321 } 322 323 CFATTACH_DECL_NEW(fan53555reg, sizeof(struct fan53555_softc), 324 fan53555_match, fan53555_attach, NULL, NULL); 325
Indexes created Tue Sep 23 02:09:52 GMT 2025