/* SPDX-License-Identifier: GPL-2.0-only */ #include <device/mmio.h> #include <assert.h> #include <boardid.h> #include <console/console.h> #include <gpio.h> #include <soc/grf.h> #include <soc/pwm.h> #include "pwm_regulator.h" /* * Apparently a period of 3333 is determined by EEs to be ideal for our * board design / resistors / capacitors / regulators but due to * clock dividers we actually get 3337. */ #define PWM_PERIOD 3337 #define PWM_DESIGN_VOLTAGE_MIN_OUTDATED 8000 #define PWM_DESIGN_VOLTAGE_MAX_OUTDATED 15000 /* Applies for Kevin rev6+ */ int kevin6_pwm_design_voltage[][2] = { [PWM_REGULATOR_GPU] = {7858, 12177}, [PWM_REGULATOR_BIG] = {7987, 13022}, [PWM_REGULATOR_LIT] = {7991, 13037}, [PWM_REGULATOR_CENTERLOG] = {8001, 10497} }; /* Applies for Gru rev2+, Bob, and Nefario. */ int pwm_design_voltage[][2] = { [PWM_REGULATOR_GPU] = {7864, 12177}, [PWM_REGULATOR_BIG] = {8001, 13022}, [PWM_REGULATOR_LIT] = {7977, 13078}, [PWM_REGULATOR_CENTERLOG] = {7994, 10499} }; /* Applies for Scarlet-based boards. */ int scarlet_pwm_design_voltage[][2] = { [PWM_REGULATOR_GPU] = {7996, 10990}, [PWM_REGULATOR_BIG] = {8000, 12992}, [PWM_REGULATOR_LIT] = {8021, 11996}, }; int pwm_enum_to_pwm_number[] = { [PWM_REGULATOR_GPU] = 0, [PWM_REGULATOR_LIT] = 2, #if CONFIG(GRU_HAS_CENTERLOG_PWM) [PWM_REGULATOR_CENTERLOG] = 3, #else [PWM_REGULATOR_CENTERLOG] = -1, #endif #if CONFIG(GRU_BASEBOARD_SCARLET) [PWM_REGULATOR_BIG] = 3, #else [PWM_REGULATOR_BIG] = 1, #endif }; void pwm_regulator_configure(enum pwm_regulator pwm, int millivolt) { int duty_ns, voltage_max, voltage_min; int voltage = millivolt * 10; /* for higher calculation accuracy */ int pwm_number = pwm_enum_to_pwm_number[pwm]; voltage_min = pwm_design_voltage[pwm][0]; voltage_max = pwm_design_voltage[pwm][1]; if ((CONFIG(BOARD_GOOGLE_KEVIN) && board_id() < 6) || (CONFIG(BOARD_GOOGLE_GRU) && board_id() < 2)) { voltage_min = PWM_DESIGN_VOLTAGE_MIN_OUTDATED; voltage_max = PWM_DESIGN_VOLTAGE_MAX_OUTDATED; } else if (CONFIG(BOARD_GOOGLE_KEVIN) && board_id() >= 6) { voltage_min = kevin6_pwm_design_voltage[pwm][0]; voltage_max = kevin6_pwm_design_voltage[pwm][1]; } else if (CONFIG(GRU_BASEBOARD_SCARLET)) { voltage_min = scarlet_pwm_design_voltage[pwm][0]; voltage_max = scarlet_pwm_design_voltage[pwm][1]; } assert(voltage <= voltage_max && voltage >= voltage_min); /* * Intentionally round down (higher volt) to be safe. * eg, for the default min & max design voltage: * period = 3337, volt = 1.1: 1906 * period = 3337, volt = 1.0: 2383 * period = 3337, volt = 0.9: 2860 */ duty_ns = PWM_PERIOD * (voltage_max - voltage) / (voltage_max - voltage_min); pwm_init(pwm_number, PWM_PERIOD, duty_ns); switch (pwm_number) { case 0: gpio_input(GPIO(4, C, 2)); /* PWM0 remove pull-down */ write32(&rk3399_grf->iomux_pwm_0, IOMUX_PWM_0); break; case 1: gpio_input(GPIO(4, C, 6)); /* PWM1 remove pull-down */ write32(&rk3399_grf->iomux_pwm_1, IOMUX_PWM_1); break; case 2: gpio_input(GPIO(1, C, 3)); /* PWM2 remove pull-down */ write32(&rk3399_pmugrf->iomux_pwm_2, IOMUX_PWM_2); break; case 3: gpio_input(GPIO(0, A, 6)); /* PWM3 remove pull-down */ write32(&rk3399_pmugrf->iomux_pwm_3a, IOMUX_PWM_3_A); break; default: die("incorrect board configuration"); } }