// SPDX-License-Identifier: GPL-2.0 /* * (C) Copyright 2014 * Heiko Schocher, DENX Software Engineering, hs@denx.de. * * Basic support for the pwm module on imx6. * * Based on linux:drivers/pwm/pwm-imx.c * from * Sascha Hauer <s.hauer@pengutronix.de> */ #include <common.h> #include <div64.h> #include <asm/arch/imx-regs.h> /* pwm_id from 0..7 */ struct pwm_regs *pwm_id_to_reg(int pwm_id) { switch (pwm_id) { case 0: return (struct pwm_regs *)PWM1_BASE_ADDR; case 1: return (struct pwm_regs *)PWM2_BASE_ADDR; #ifdef CONFIG_MX6 case 2: return (struct pwm_regs *)PWM3_BASE_ADDR; case 3: return (struct pwm_regs *)PWM4_BASE_ADDR; #endif #ifdef CONFIG_MX6SX case 4: return (struct pwm_regs *)PWM5_BASE_ADDR; case 5: return (struct pwm_regs *)PWM6_BASE_ADDR; case 6: return (struct pwm_regs *)PWM7_BASE_ADDR; case 7: return (struct pwm_regs *)PWM8_BASE_ADDR; #endif default: printf("unknown pwm_id: %d\n", pwm_id); break; } return NULL; } int pwm_imx_get_parms(int period_ns, int duty_ns, unsigned long *period_c, unsigned long *duty_c, unsigned long *prescale) { unsigned long long c; /* * we have not yet a clock framework for imx6, so add the clock * value here as a define. Replace it when we have the clock * framework. */ c = CONFIG_IMX6_PWM_PER_CLK; c = c * period_ns; do_div(c, 1000000000); *period_c = c; *prescale = *period_c / 0x10000 + 1; *period_c /= *prescale; c = *period_c * (unsigned long long)duty_ns; do_div(c, period_ns); *duty_c = c; /* * according to imx pwm RM, the real period value should be * PERIOD value in PWMPR plus 2. */ if (*period_c > 2) *period_c -= 2; else *period_c = 0; return 0; }