| /* 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"); |
| } |
| } |