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124 lines
3.1 KiB
C
124 lines
3.1 KiB
C
/*
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* Fan driver for Nintendo Switch
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*
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* Copyright (c) 2018-2023 CTCaer
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms and conditions of the GNU General Public License,
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* version 2, as published by the Free Software Foundation.
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*
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* This program is distributed in the hope it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
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* more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include <thermal/fan.h>
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#include <power/regulator_5v.h>
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#include <soc/bpmp.h>
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#include <soc/clock.h>
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#include <soc/fuse.h>
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#include <soc/gpio.h>
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#include <soc/hw_init.h>
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#include <soc/pinmux.h>
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#include <soc/timer.h>
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#include <soc/t210.h>
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void set_fan_duty(u32 duty)
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{
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static bool fan_init = false;
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static u16 curr_duty = -1;
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if (duty > 236)
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duty = 236;
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if (curr_duty == duty)
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return;
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curr_duty = duty;
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if (!fan_init)
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{
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// Fan tachometer.
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u32 pull_resistor = hw_get_chip_id() == GP_HIDREV_MAJOR_T210 ? PINMUX_PULL_UP : 0;
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PINMUX_AUX(PINMUX_AUX_CAM1_PWDN) = PINMUX_TRISTATE | PINMUX_INPUT_ENABLE | pull_resistor | 1;
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gpio_direction_input(GPIO_PORT_S, GPIO_PIN_7);
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// Enable PWM if disabled.
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if (fuse_read_hw_type() == FUSE_NX_HW_TYPE_AULA)
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{
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// Ease the stress to APB.
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bpmp_freq_t prev_fid = bpmp_clk_rate_set(BPMP_CLK_NORMAL);
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clock_enable_pwm();
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// Restore OC.
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bpmp_clk_rate_set(prev_fid);
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}
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PWM(PWM_CONTROLLER_PWM_CSR_1) = PWM_CSR_EN | (0x100 << 16); // Max PWM to disable fan.
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PINMUX_AUX(PINMUX_AUX_LCD_GPIO2) = 1; // Set source to PWM1.
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gpio_config(GPIO_PORT_V, GPIO_PIN_4, GPIO_MODE_SPIO); // Fan power mode.
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fan_init = true;
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}
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// Inverted polarity.
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u32 inv_duty = 236 - duty;
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// If disabled send a 0 duty.
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if (inv_duty == 236)
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{
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PWM(PWM_CONTROLLER_PWM_CSR_1) = PWM_CSR_EN | (0x100 << 16); // Bit 24 is absolute 0%.
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regulator_5v_disable(REGULATOR_5V_FAN);
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// Disable fan.
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PINMUX_AUX(PINMUX_AUX_LCD_GPIO2) = PINMUX_INPUT_ENABLE | PINMUX_PARKED |
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PINMUX_TRISTATE | PINMUX_PULL_DOWN; // Set source to PWM1.
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}
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else // Set PWM duty.
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{
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// Fan power supply.
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regulator_5v_enable(REGULATOR_5V_FAN);
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PWM(PWM_CONTROLLER_PWM_CSR_1) = PWM_CSR_EN | (inv_duty << 16);
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// Enable fan.
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PINMUX_AUX(PINMUX_AUX_LCD_GPIO2) = 1; // Set source to PWM1.
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}
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}
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void get_fan_speed(u32 *duty, u32 *rpm)
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{
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if (rpm)
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{
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u32 irq_count = 0;
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bool should_read = true;
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// Poll irqs for 2 seconds. (5 seconds for accurate count).
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int timer = get_tmr_us() + 2000000;
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while ((timer - get_tmr_us()) > 0)
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{
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bool irq_val = gpio_read(GPIO_PORT_S, GPIO_PIN_7);
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if (irq_val && should_read)
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{
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irq_count++;
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should_read = false;
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}
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else if (!irq_val)
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should_read = true;
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}
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// Halve the irq count.
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irq_count /= 2;
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// Calculate rpm based on triggered interrupts.
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*rpm = irq_count * (60 / 2);
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}
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if (duty)
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*duty = 236 - ((PWM(PWM_CONTROLLER_PWM_CSR_1) >> 16) & 0xFF);
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}
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