3 * Heiko Schocher, DENX Software Engineering, hs@denx.de.
5 * Basic support for the pwm module on imx6.
7 * Based on linux:drivers/pwm/pwm-imx.c
9 * Sascha Hauer <s.hauer@pengutronix.de>
11 * SPDX-License-Identifier: GPL-2.0
16 #include <asm/arch/imx-regs.h>
18 /* pwm_id from 0..7 */
19 struct pwm_regs *pwm_id_to_reg(int pwm_id)
23 return (struct pwm_regs *)PWM1_BASE_ADDR;
25 return (struct pwm_regs *)PWM2_BASE_ADDR;
27 return (struct pwm_regs *)PWM3_BASE_ADDR;
29 return (struct pwm_regs *)PWM4_BASE_ADDR;
32 return (struct pwm_regs *)PWM5_BASE_ADDR;
34 return (struct pwm_regs *)PWM6_BASE_ADDR;
36 return (struct pwm_regs *)PWM7_BASE_ADDR;
38 return (struct pwm_regs *)PWM8_BASE_ADDR;
41 printf("unknown pwm_id: %d\n", pwm_id);
47 int pwm_imx_get_parms(int period_ns, int duty_ns, unsigned long *period_c,
48 unsigned long *duty_c, unsigned long *prescale)
53 * we have not yet a clock framework for imx6, so add the clock
54 * value here as a define. Replace it when we have the clock
57 c = CONFIG_IMX6_PWM_PER_CLK;
59 do_div(c, 1000000000);
62 *prescale = *period_c / 0x10000 + 1;
64 *period_c /= *prescale;
65 c = *period_c * (unsigned long long)duty_ns;
70 * according to imx pwm RM, the real period value should be
71 * PERIOD value in PWMPR plus 2.