From: Boris Brezillon <boris.brezillon@free-electrons.com>
To: Lukasz Majewski <l.majewski@majess.pl>
Cc: Thierry Reding <thierry.reding@gmail.com>,
Stefan Agner <stefan@agner.ch>,
linux-pwm@vger.kernel.org, linux-kernel@vger.kernel.org,
Fabio Estevam <fabio.estevam@nxp.com>,
Fabio Estevam <festevam@gmail.com>,
Lothar Wassmann <LW@karo-electronics.de>,
Bhuvanchandra DV <bhuvanchandra.dv@toradex.com>,
kernel@pengutronix.de
Subject: Re: [PATCH 4/6] pwm: imx: Provide atomic PWM support for IMXv2 PWM
Date: Mon, 24 Oct 2016 17:25:26 +0200 [thread overview]
Message-ID: <20161024172526.798de5ce@bbrezillon> (raw)
In-Reply-To: <1477259146-19167-5-git-send-email-l.majewski@majess.pl>
On Sun, 23 Oct 2016 23:45:44 +0200
Lukasz Majewski <l.majewski@majess.pl> wrote:
> This commit provides apply() callback implementation for IMX's PWMv2.
>
> Suggested-by: Stefan Agner <stefan@agner.ch>
> Suggested-by: Boris Brezillon <boris.brezillon@free-electrons.com>
> Signed-off-by: Lukasz Majewski <l.majewski@majess.pl>
Reviewed-by: Boris Brezillon <boris.brezillon@free-electrons.com>
> ---
> drivers/pwm/pwm-imx.c | 79 +++++++++++++++++++++++++++++++++++++++++++++++++++
> 1 file changed, 79 insertions(+)
>
> diff --git a/drivers/pwm/pwm-imx.c b/drivers/pwm/pwm-imx.c
> index f3577c5..df25379 100644
> --- a/drivers/pwm/pwm-imx.c
> +++ b/drivers/pwm/pwm-imx.c
> @@ -171,6 +171,84 @@ static void imx_pwm_wait_fifo_slot(struct pwm_chip *chip,
> }
> }
>
> +static int imx_pwm_apply_v2(struct pwm_chip *chip, struct pwm_device *pwm,
> + struct pwm_state *state)
> +{
> + unsigned long period_cycles, duty_cycles, prescale;
> + struct imx_chip *imx = to_imx_chip(chip);
> + struct pwm_state cstate;
> + unsigned long long c;
> + u32 cr = 0;
> + int ret;
> +
> + ret = clk_prepare_enable(imx->clk_ipg);
> + if (ret)
> + return ret;
> +
> + pwm_get_state(pwm, &cstate);
> +
> + c = clk_get_rate(imx->clk_per);
> + c *= state->period;
> +
> + do_div(c, 1000000000);
> + period_cycles = c;
> +
> + prescale = period_cycles / 0x10000 + 1;
> +
> + period_cycles /= prescale;
> + c = (unsigned long long)period_cycles * state->duty_cycle;
> + do_div(c, state->period);
> + duty_cycles = c;
> +
> + /*
> + * according to imx pwm RM, the real period value should be
> + * PERIOD value in PWMPR plus 2.
> + */
> + if (period_cycles > 2)
> + period_cycles -= 2;
> + else
> + period_cycles = 0;
> +
> + /* Enable the clock if the PWM is being enabled. */
> + if (state->enabled && !cstate.enabled) {
> + ret = clk_prepare_enable(imx->clk_per);
> + if (ret)
> + return ret;
> + }
> +
> + /*
> + * Wait for a free FIFO slot if the PWM is already enabled, and flush
> + * the FIFO if the PWM was disabled and is about to be enabled.
> + */
> + if (cstate.enabled)
> + imx_pwm_wait_fifo_slot(chip, pwm);
> + else if (state->enabled)
> + imx_pwm_sw_reset(chip);
> +
> + writel(duty_cycles, imx->mmio_base + MX3_PWMSAR);
> + writel(period_cycles, imx->mmio_base + MX3_PWMPR);
> +
> + cr |= MX3_PWMCR_PRESCALER(prescale) |
> + MX3_PWMCR_DOZEEN | MX3_PWMCR_WAITEN |
> + MX3_PWMCR_DBGEN | MX3_PWMCR_CLKSRC_IPG_HIGH;
> +
> + if (state->enabled)
> + cr |= MX3_PWMCR_EN;
> +
> + if (state->polarity == PWM_POLARITY_INVERSED)
> + cr |= MX3_PWMCR_POUTC;
> +
> + writel(cr, imx->mmio_base + MX3_PWMCR);
> +
> + /* Disable the clock if the PWM is being disabled. */
> + if (!state->enabled && cstate.enabled)
> + clk_disable_unprepare(imx->clk_per);
> +
> + clk_disable_unprepare(imx->clk_ipg);
> +
> + return 0;
> +}
> +
> static int imx_pwm_config_v2(struct pwm_chip *chip,
> struct pwm_device *pwm, int duty_ns, int period_ns)
> {
> @@ -322,6 +400,7 @@ static struct pwm_ops imx_pwm_ops_v2 = {
> .disable = imx_pwm_disable,
> .set_polarity = imx_pwm_set_polarity,
> .config = imx_pwm_config,
> + .apply = imx_pwm_apply_v2,
> .owner = THIS_MODULE,
> };
>
next prev parent reply other threads:[~2016-10-24 15:25 UTC|newest]
Thread overview: 59+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-10-23 21:45 [PATCH 0/6] pwm: imx: Provide atomic operation for IMX PWM driver Lukasz Majewski
2016-10-23 21:45 ` [PATCH 1/6] pwm: imx: Rewrite imx_pwm_*_v1 code to facilitate switch to atomic pwm operation Lukasz Majewski
2016-10-24 15:21 ` Boris Brezillon
2016-10-25 5:54 ` Sascha Hauer
2016-10-25 6:27 ` Boris Brezillon
2016-10-25 6:32 ` Sascha Hauer
2016-10-25 6:42 ` Boris Brezillon
2016-10-25 6:55 ` Lukasz Majewski
2016-10-23 21:45 ` [PATCH 2/6] pwm: imx: Move PWMv2 software reset code to a separate function Lukasz Majewski
2016-10-24 15:23 ` Boris Brezillon
2016-10-24 21:02 ` Lukasz Majewski
2016-10-23 21:45 ` [PATCH 3/6] pwm: imx: Move PWMv2 wait for fifo slot " Lukasz Majewski
2016-10-24 15:23 ` Boris Brezillon
2016-10-23 21:45 ` [PATCH 4/6] pwm: imx: Provide atomic PWM support for IMXv2 PWM Lukasz Majewski
2016-10-24 15:25 ` Boris Brezillon [this message]
2016-10-23 21:45 ` [PATCH 5/6] pwm: imx: Remove redundant IMX PWMv2 code Lukasz Majewski
2016-10-24 15:27 ` Boris Brezillon
2016-10-23 21:45 ` [PATCH 6/6] pwm: imx: Introduce "polarity_supported" flag to PWMv2 driver Lukasz Majewski
2016-10-24 15:28 ` Boris Brezillon
2016-10-24 15:34 ` Boris Brezillon
2016-10-24 21:14 ` Lukasz Majewski
2016-10-25 6:37 ` Boris Brezillon
2016-10-25 6:58 ` Lukasz Majewski
2016-10-24 15:36 ` [PATCH 0/6] pwm: imx: Provide atomic operation for IMX PWM driver Boris Brezillon
2016-10-24 21:26 ` Lukasz Majewski
2016-10-25 3:41 ` Stefan Agner
2016-10-25 7:07 ` Lukasz Majewski
2016-10-25 17:08 ` Fabio Estevam
2016-10-25 17:09 ` Fabio Estevam
2016-10-27 5:59 ` Lukasz Majewski
2016-12-26 22:55 ` [PATCH v3 RESEND 00/11] " Lukasz Majewski
2016-12-26 22:55 ` [PATCH v3 RESEND 01/11] pwm: print error messages with pr_err() instead of pr_debug() Lukasz Majewski
2016-12-26 22:55 ` [PATCH v3 RESEND 02/11] pwm: imx: remove ipg clock Lukasz Majewski
2016-12-27 7:26 ` Stefan Agner
2016-12-27 7:54 ` Lukasz Majewski
2016-12-28 22:01 ` Lukasz Majewski
2016-12-29 7:22 ` Stefan Agner
2016-12-29 10:06 ` Lukasz Majewski
2016-12-26 22:55 ` [PATCH v3 RESEND 03/11] pwm: imx: Add separate set of pwm ops for PWMv1 and PWMv2 Lukasz Majewski
2016-12-26 22:55 ` [PATCH v3 RESEND 04/11] pwm: imx: Rewrite imx_pwm_*_v1 code to facilitate switch to atomic pwm operation Lukasz Majewski
2016-12-26 22:55 ` [PATCH v3 RESEND 05/11] pwm: imx: Move PWMv2 software reset code to a separate function Lukasz Majewski
2016-12-26 22:55 ` [PATCH v3 RESEND 06/11] pwm: imx: Move PWMv2 wait for fifo slot " Lukasz Majewski
2016-12-26 22:55 ` [PATCH v3 RESEND 07/11] pwm: imx: Provide atomic PWM support for i.MX PWMv2 Lukasz Majewski
2016-12-29 16:21 ` Boris Brezillon
2016-12-29 16:45 ` Lukasz Majewski
2016-12-29 17:08 ` Boris Brezillon
2017-01-03 11:43 ` Lukasz Majewski
2017-01-03 12:46 ` Boris Brezillon
2017-01-03 17:29 ` Stefan Agner
2017-01-03 19:35 ` Boris Brezillon
2017-01-03 22:01 ` Lukasz Majewski
2017-01-03 22:18 ` Boris Brezillon
2017-01-03 22:46 ` Lukasz Majewski
2017-01-03 23:34 ` Boris Brezillon
2017-01-04 11:29 ` Lukasz Majewski
2016-12-26 22:55 ` [PATCH v3 RESEND 08/11] pwm: imx: Remove redundant i.MX PWMv2 code Lukasz Majewski
2016-12-26 22:55 ` [PATCH v3 RESEND 09/11] pwm: core: make the PWM_POLARITY flag in DTB optional Lukasz Majewski
2016-12-26 22:56 ` [PATCH v3 RESEND 10/11] pwm: imx: doc: Update imx-pwm.txt documentation entry Lukasz Majewski
2016-12-26 22:56 ` [PATCH v3 RESEND 11/11] pwm: imx: Add polarity inversion support to i.MX's PWMv2 Lukasz Majewski
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