/* $NetBSD: fan53555.c,v 1.10 2025/09/17 13:42:42 thorpej Exp $ */ /*- * Copyright (c) 2018 Jared McNeill * All rights reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE * POSSIBILITY OF SUCH DAMAGE. */ #include __KERNEL_RCSID(0, "$NetBSD: fan53555.c,v 1.10 2025/09/17 13:42:42 thorpej Exp $"); #include #include #include #include #include #include #include #include #include #define VSEL0_REG 0x00 #define VSEL1_REG 0x01 #define VSEL_BUCK_EN __BIT(7) #define VSEL_MODE __BIT(6) #define VSEL_NSEL __BITS(5,0) #define CONTROL_REG 0x02 #define CONTROL_OUTPUT_DISCHARGE __BIT(7) #define CONTROL_SLEW __BITS(6,4) #define CONTROL_RESET __BIT(2) #define ID1_REG 0x03 #define ID1_VENDOR __BITS(7,5) #define ID1_DIE_ID __BITS(3,0) #define SILERGY_DIE_ID_SYR82X 8 #define SILERGY_DIE_ID_SYR83X 9 #define ID2_REG 0x04 #define ID2_DIE_REV __BITS(3,0) #define MONITOR_REG 0x05 #define MONITOR_PGOOD __BIT(7) struct fan53555_softc { device_t sc_dev; i2c_tag_t sc_i2c; i2c_addr_t sc_addr; int sc_phandle; u_int sc_suspend_reg; u_int sc_runtime_reg; u_int sc_base; u_int sc_step; u_int sc_ramp_delay; u_int sc_suspend_voltage_selector; }; enum fan53555_vendor { FAN_VENDOR_FAIRCHILD = 1, FAN_VENDOR_SILERGY, }; /* * Transition slew rates. * Array index is reg value, value is slew rate in uV / us */ static const int fan53555_slew_rates[] = { 64000, 32000, 16000, 8000, 4000, 2000, 1000, 500 }; static const struct device_compatible_entry compat_data[] = { { .compat = "silergy,syr827", .value = FAN_VENDOR_SILERGY }, { .compat = "silergy,syr828", .value = FAN_VENDOR_SILERGY }, DEVICE_COMPAT_EOL }; static uint8_t fan53555_read(struct fan53555_softc *sc, uint8_t reg, int flags) { uint8_t val = 0; int error; error = iic_exec(sc->sc_i2c, I2C_OP_READ_WITH_STOP, sc->sc_addr, ®, 1, &val, 1, flags); if (error != 0) aprint_error_dev(sc->sc_dev, "error reading reg %#x: %d\n", reg, error); return val; } static void fan53555_write(struct fan53555_softc *sc, uint8_t reg, uint8_t val, int flags) { uint8_t buf[2]; int error; buf[0] = reg; buf[1] = val; error = iic_exec(sc->sc_i2c, I2C_OP_WRITE_WITH_STOP, sc->sc_addr, NULL, 0, buf, 2, flags); if (error != 0) aprint_error_dev(sc->sc_dev, "error writing reg %#x: %d\n", reg, error); } #define I2C_READ(sc, reg) fan53555_read((sc), (reg), 0) #define I2C_WRITE(sc, reg, val) fan53555_write((sc), (reg), (val), 0) #define I2C_LOCK(sc) iic_acquire_bus((sc)->sc_i2c, 0) #define I2C_UNLOCK(sc) iic_release_bus((sc)->sc_i2c, 0) static int fan53555_acquire(device_t dev) { return 0; } static void fan53555_release(device_t dev) { } static int fan53555_enable(device_t dev, bool enable) { struct fan53555_softc * const sc = device_private(dev); uint8_t val; I2C_LOCK(sc); val = I2C_READ(sc, sc->sc_runtime_reg); if (enable) val |= VSEL_BUCK_EN; else val &= ~VSEL_BUCK_EN; I2C_WRITE(sc, sc->sc_runtime_reg, val); I2C_UNLOCK(sc); if (sc->sc_ramp_delay) delay(sc->sc_ramp_delay); return 0; } static int fan53555_set_voltage(device_t dev, u_int min_uvol, u_int max_uvol) { struct fan53555_softc * const sc = device_private(dev); uint8_t val, oval; u_int cur_uvol; I2C_LOCK(sc); /* Get current voltage */ oval = I2C_READ(sc, sc->sc_runtime_reg); cur_uvol = __SHIFTOUT(oval, VSEL_NSEL) * sc->sc_step + sc->sc_base; /* Set new voltage */ val = oval & ~VSEL_NSEL; val |= __SHIFTIN((min_uvol - sc->sc_base) / sc->sc_step, VSEL_NSEL); I2C_WRITE(sc, sc->sc_runtime_reg, val); I2C_UNLOCK(sc); /* Time to delay is based on the number of voltage steps */ if (sc->sc_ramp_delay) delay((abs(cur_uvol - min_uvol) / sc->sc_step) * sc->sc_ramp_delay); return 0; } static int fan53555_get_voltage(device_t dev, u_int *puvol) { struct fan53555_softc * const sc = device_private(dev); uint8_t val; I2C_LOCK(sc); val = I2C_READ(sc, sc->sc_runtime_reg); I2C_UNLOCK(sc); *puvol = __SHIFTOUT(val, VSEL_NSEL) * sc->sc_step + sc->sc_base; return 0; } static struct fdtbus_regulator_controller_func fan53555_funcs = { .acquire = fan53555_acquire, .release = fan53555_release, .enable = fan53555_enable, .set_voltage = fan53555_set_voltage, .get_voltage = fan53555_get_voltage, }; static int fan53555_init(struct fan53555_softc *sc, enum fan53555_vendor vendor) { uint8_t id1, control; int n; I2C_LOCK(sc); id1 = I2C_READ(sc, ID1_REG); I2C_UNLOCK(sc); const u_int die_id = __SHIFTOUT(id1, ID1_DIE_ID); aprint_naive("\n"); switch (vendor) { case FAN_VENDOR_SILERGY: switch (die_id) { case SILERGY_DIE_ID_SYR82X: aprint_normal(": Silergy SYR82X\n"); sc->sc_base = 712500; sc->sc_step = 12500; break; case SILERGY_DIE_ID_SYR83X: aprint_normal(": Silergy SYR83X\n"); sc->sc_base = 712500; sc->sc_step = 12500; break; default: aprint_error(": Unsupported Silergy chip (0x%x)\n", die_id); return ENXIO; } break; default: aprint_error(": Unsupported vendor (%d)\n", vendor); return ENXIO; } sc->sc_suspend_voltage_selector = -1; of_getprop_uint32(sc->sc_phandle, "fcs,suspend-voltage-selector", &sc->sc_suspend_voltage_selector); switch (sc->sc_suspend_voltage_selector) { case 0: sc->sc_suspend_reg = VSEL0_REG; sc->sc_runtime_reg = VSEL1_REG; break; case 1: sc->sc_suspend_reg = VSEL1_REG; sc->sc_runtime_reg = VSEL0_REG; break; default: aprint_error_dev(sc->sc_dev, "unsupported 'fcs,suspend-voltage-selector' value %u\n", sc->sc_suspend_voltage_selector); return EINVAL; } of_getprop_uint32(sc->sc_phandle, "regulator-ramp-delay", &sc->sc_ramp_delay); if (sc->sc_ramp_delay) { for (n = 0; n < __arraycount(fan53555_slew_rates); n++) if (sc->sc_ramp_delay > fan53555_slew_rates[n]) break; if (n == __arraycount(fan53555_slew_rates)) { aprint_error_dev(sc->sc_dev, "unsupported 'regulator-ramp-delay' value %u\n", sc->sc_ramp_delay); return EINVAL; } I2C_LOCK(sc); control = I2C_READ(sc, CONTROL_REG); control &= ~CONTROL_SLEW; control |= __SHIFTIN(fan53555_slew_rates[n], CONTROL_SLEW); I2C_WRITE(sc, CONTROL_REG, control); I2C_UNLOCK(sc); } return 0; } static int fan53555_match(device_t parent, cfdata_t match, void *aux) { struct i2c_attach_args *ia = aux; int match_result; if (iic_use_direct_match(ia, match, compat_data, &match_result)) return match_result; return 0; } static void fan53555_attach(device_t parent, device_t self, void *aux) { struct fan53555_softc * const sc = device_private(self); const struct device_compatible_entry *compat; struct i2c_attach_args *ia = aux; sc->sc_dev = self; sc->sc_i2c = ia->ia_tag; sc->sc_addr = ia->ia_addr; sc->sc_phandle = devhandle_to_of(device_handle(self)); compat = iic_compatible_lookup(ia, compat_data); KASSERT(compat != NULL); if (fan53555_init(sc, compat->value) != 0) return; fdtbus_register_regulator_controller(self, sc->sc_phandle, &fan53555_funcs); } CFATTACH_DECL_NEW(fan53555reg, sizeof(struct fan53555_softc), fan53555_match, fan53555_attach, NULL, NULL);