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enable PWM fan in uboot for LPi4A

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SkyRain
2025-02-16 11:06:47 +00:00
committed by Han Gao
parent b5ee6e549a
commit 6278bac553
1 changed files with 53 additions and 4 deletions
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57
board/thead/light-c910/light.c
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@@ -2402,13 +2402,59 @@ static void light_iopin_init(void)
}
#endif
#define PWM_BASE ((void *)0xffec01c000)
#define PWM_CHAN_REG(chan, off) (PWM_BASE + (chan) * 0x20 + (off))
#define PWM_PER_OFFSET 0x08 // Offset for Periodic Control Register
#define PWM_FP_OFFSET 0x0C // Offset for First Phase Control Register
#define PWM_CTRL_OFFSET 0x00 // Offset for Control Register
// See T-HEAD TH1520 Peripheral Interface User Manual
// https://dl.sipeed.com/shareURL/LICHEE/licheepi4a/09_Doc
static void light_pwm_config(void)
{
/* pwm0 */
writel(0x4b0, (void *)0xFFEC01C008);
writel(0x258, (void *)0xFFEC01C00c);
writel(0x328, (void *)0xFFEC01C000);
/*
* Enable MIPI Display backlight on PWM0.
* Period=1200 clock cycles, Duty Cycle=50%
*/
// Set PWM Period to 1200 clock cycles
writel(0x4b0, PWM_CHAN_REG(0, PWM_PER_OFFSET));
// Set PWM First Phase to 600 clock cycles
writel(0x258, PWM_CHAN_REG(0, PWM_FP_OFFSET));
// Configure PWM Control Register:
// [9] INACTOUT = 1 (inactive output set to high)
// [8] FPOUT = 1 (first phase output set to high)
// [7:6] EVTRIG = 00 (event-triggered mode disabled)
// [5:4] MODE = 10 (continuous mode)
// [3] INTEN = 1 (interrupt enabled)
// [2] CFG_UPDATE = 0 (do not wait for configuration update)
// [1] SOFT_RST = 0 (software reset disabled)
// [0] START = 0 (PWM start coding enable, rising edge effective)
// Final address: 0xffec01c000 + 0x00 (channel 0) + 0x00 (control register offset) = 0xffec01c000
writel(0b1100101000, PWM_CHAN_REG(0, PWM_CTRL_OFFSET));
}
static void lpi4a_fan_pwm_config(void)
{
/*
* Enable fan on PWM1(GPIO10) for Lichee Pi 4A.
* See LPi4A Schematic:
* https://dl.sipeed.com/shareURL/LICHEE/licheepi4a/02_Schematic
*/
// Set PWM Period to 1200 clock cycles
writel(0x4b0, PWM_CHAN_REG(1, PWM_PER_OFFSET));
// Set PWM First Phase to 600 clock cycles
writel(0x258, PWM_CHAN_REG(1, PWM_FP_OFFSET));
// Configure PWM Control Register:
// [9] INACTOUT = 1 (inactive output set to high)
// [8] FPOUT = 1 (first phase output set to high)
// [7:6] EVTRIG = 00 (event-triggered mode disabled)
// [5:4] MODE = 10 (continuous mode)
// [3] INTEN = 0 (interrupt disabled)
// [2] CFG_UPDATE = 0 (do not wait for configuration update)
// [1] SOFT_RST = 0 (software reset disabled)
// [0] START = 0 (PWM start coding enable, rising edge effective)
// Final address: 0xffec01c000 + 0x20 (channel 1) + 0x00 (control register offset) = 0xffec01c020
writel(0b1100100000, PWM_CHAN_REG(1, PWM_CTRL_OFFSET));
}
int board_init(void)
@@ -2425,6 +2471,9 @@ int board_init(void)
light_pwm_config();
#ifdef CONFIG_TARGET_LIGHT_FM_C910_LPI4A
lpi4a_fan_pwm_config();
#endif
return 0;
}