1 /* 2 * (C) Copyright 2014 3 * Heiko Schocher, DENX Software Engineering, hs@denx.de. 4 * 5 * Basic support for the pwm modul on imx6. 6 * 7 * SPDX-License-Identifier: GPL-2.0+ 8 */ 9 10 #include <common.h> 11 #include <div64.h> 12 #include <pwm.h> 13 #include <asm/arch/imx-regs.h> 14 #include <asm/io.h> 15 #include "pwm-imx-util.h" 16 17 int pwm_init(int pwm_id, int div, int invert) 18 { 19 struct pwm_regs *pwm = (struct pwm_regs *)pwm_id_to_reg(pwm_id); 20 21 writel(0, &pwm->ir); 22 return 0; 23 } 24 25 int pwm_config(int pwm_id, int duty_ns, int period_ns) 26 { 27 struct pwm_regs *pwm = (struct pwm_regs *)pwm_id_to_reg(pwm_id); 28 unsigned long period_cycles, duty_cycles, prescale; 29 u32 cr; 30 31 pwm_imx_get_parms(period_ns, duty_ns, &period_cycles, &duty_cycles, 32 &prescale); 33 34 cr = PWMCR_PRESCALER(prescale) | 35 PWMCR_DOZEEN | PWMCR_WAITEN | 36 PWMCR_DBGEN | PWMCR_CLKSRC_IPG_HIGH; 37 38 writel(cr, &pwm->cr); 39 /* set duty cycles */ 40 writel(duty_cycles, &pwm->sar); 41 /* set period cycles */ 42 writel(period_cycles, &pwm->pr); 43 return 0; 44 } 45 46 int pwm_enable(int pwm_id) 47 { 48 struct pwm_regs *pwm = (struct pwm_regs *)pwm_id_to_reg(pwm_id); 49 50 setbits_le32(&pwm->cr, PWMCR_EN); 51 return 0; 52 } 53 54 void pwm_disable(int pwm_id) 55 { 56 struct pwm_regs *pwm = (struct pwm_regs *)pwm_id_to_reg(pwm_id); 57 58 clrbits_le32(&pwm->cr, PWMCR_EN); 59 } 60