upstream u-boot with additional patches for our devices/boards:
https://lists.denx.de/pipermail/u-boot/2017-March/282789.html (AXP crashes) ;
Gbit ethernet patch for some LIME2 revisions ;
with SPI flash support
You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
73 lines
1.4 KiB
73 lines
1.4 KiB
/*
|
|
* (C) Copyright 2014
|
|
* Heiko Schocher, DENX Software Engineering, hs@denx.de.
|
|
*
|
|
* Basic support for the pwm modul on imx6.
|
|
*
|
|
* Based on linux:drivers/pwm/pwm-imx.c
|
|
* from
|
|
* Sascha Hauer <s.hauer@pengutronix.de>
|
|
*
|
|
* SPDX-License-Identifier: GPL-2.0
|
|
*/
|
|
|
|
#include <common.h>
|
|
#include <div64.h>
|
|
#include <asm/arch/imx-regs.h>
|
|
|
|
/* pwm_id from 0..3 */
|
|
struct pwm_regs *pwm_id_to_reg(int pwm_id)
|
|
{
|
|
switch (pwm_id) {
|
|
case 0:
|
|
return (struct pwm_regs *)PWM1_BASE_ADDR;
|
|
break;
|
|
case 1:
|
|
return (struct pwm_regs *)PWM2_BASE_ADDR;
|
|
break;
|
|
case 2:
|
|
return (struct pwm_regs *)PWM3_BASE_ADDR;
|
|
break;
|
|
case 3:
|
|
return (struct pwm_regs *)PWM4_BASE_ADDR;
|
|
break;
|
|
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 = (unsigned long long)(*period_c * 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;
|
|
}
|
|
|