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| author | Heiko Schocher <hs@denx.de> | 2014-07-18 06:07:19 +0200 |
|---|---|---|
| committer | Stefano Babic <sbabic@denx.de> | 2014-07-23 12:25:42 +0200 |
| commit | b2f97cf279c54c51741539455116ec3393a871ea (patch) | |
| tree | 8f193654de90dcd7b2f0928db887a38204b0f9bc /drivers/pwm/pwm-imx.c | |
| parent | aafe4020c1d0c0f989b68f839d66ffc66df6ab9e (diff) | |
| download | u-boot-imx-b2f97cf279c54c51741539455116ec3393a871ea.zip u-boot-imx-b2f97cf279c54c51741539455116ec3393a871ea.tar.gz u-boot-imx-b2f97cf279c54c51741539455116ec3393a871ea.tar.bz2 | |
pwm, imx6: add support for pwm modul on imx6
add basic support for the pwm modul found on imx6.
Pieces of this code are based on linux code from drivers/pwm/pwm-imx.c
Commit "cd3de83f1476 Linux 3.16-rc4"
Signed-off-by: Heiko Schocher <hs@denx.de>
Acked-by: Stefano Babic <sbabic@denx.de>
Cc: Wolfgang Denk <wd@denx.de>
Diffstat (limited to 'drivers/pwm/pwm-imx.c')
| -rw-r--r-- | drivers/pwm/pwm-imx.c | 59 |
1 files changed, 59 insertions, 0 deletions
diff --git a/drivers/pwm/pwm-imx.c b/drivers/pwm/pwm-imx.c new file mode 100644 index 0000000..40bf027 --- /dev/null +++ b/drivers/pwm/pwm-imx.c @@ -0,0 +1,59 @@ +/* + * (C) Copyright 2014 + * Heiko Schocher, DENX Software Engineering, hs@denx.de. + * + * Basic support for the pwm modul on imx6. + * + * SPDX-License-Identifier: GPL-2.0+ + */ + +#include <common.h> +#include <div64.h> +#include <pwm.h> +#include <asm/arch/imx-regs.h> +#include <asm/io.h> +#include "pwm-imx-util.h" + +int pwm_init(int pwm_id, int div, int invert) +{ + struct pwm_regs *pwm = (struct pwm_regs *)pwm_id_to_reg(pwm_id); + + writel(0, &pwm->ir); + return 0; +} + +int pwm_config(int pwm_id, int duty_ns, int period_ns) +{ + struct pwm_regs *pwm = (struct pwm_regs *)pwm_id_to_reg(pwm_id); + unsigned long period_cycles, duty_cycles, prescale; + u32 cr; + + pwm_imx_get_parms(period_ns, duty_ns, &period_cycles, &duty_cycles, + &prescale); + + cr = PWMCR_PRESCALER(prescale) | + PWMCR_DOZEEN | PWMCR_WAITEN | + PWMCR_DBGEN | PWMCR_CLKSRC_IPG_HIGH; + + writel(cr, &pwm->cr); + /* set duty cycles */ + writel(duty_cycles, &pwm->sar); + /* set period cycles */ + writel(period_cycles, &pwm->pr); + return 0; +} + +int pwm_enable(int pwm_id) +{ + struct pwm_regs *pwm = (struct pwm_regs *)pwm_id_to_reg(pwm_id); + + setbits_le32(&pwm->cr, PWMCR_EN); + return 0; +} + +void pwm_disable(int pwm_id) +{ + struct pwm_regs *pwm = (struct pwm_regs *)pwm_id_to_reg(pwm_id); + + clrbits_le32(&pwm->cr, PWMCR_EN); +} |