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[81.129.170.149]) by smtp.gmail.com with ESMTPSA id q75sm22429319wmd.6.2016.02.10.05.04.42 (version=TLS1_2 cipher=ECDHE-RSA-AES128-SHA bits=128/128); Wed, 10 Feb 2016 05:04:42 -0800 (PST) From: Lee Jones To: linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, thierry.reding@gmail.com, linux-pwm@vger.kernel.org, ajitpal.singh@st.com Cc: kernel@stlinux.com, maxime.coquelin@st.com, Lee Jones Subject: [PATCH 08/11] pwm: sti: Add support for PWM Capture IRQs Date: Wed, 10 Feb 2016 13:02:25 +0000 Message-Id: <1455109348-32767-9-git-send-email-lee.jones@linaro.org> X-Mailer: git-send-email 1.9.1 In-Reply-To: <1455109348-32767-1-git-send-email-lee.jones@linaro.org> References: <1455109348-32767-1-git-send-email-lee.jones@linaro.org> Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Here we're requesting the PWM Capture IRQ and supplying the handler which will be called in the event of an IRQ fire to handle it. Signed-off-by: Lee Jones --- drivers/pwm/pwm-sti.c | 91 ++++++++++++++++++++++++++++++++++++++++++++++++++- 1 file changed, 90 insertions(+), 1 deletion(-) -- 1.9.1 diff --git a/drivers/pwm/pwm-sti.c b/drivers/pwm/pwm-sti.c index fca692a..82a69e4 100644 --- a/drivers/pwm/pwm-sti.c +++ b/drivers/pwm/pwm-sti.c @@ -12,6 +12,7 @@ #include #include +#include #include #include #include @@ -94,7 +95,9 @@ struct sti_pwm_chip { struct regmap_field *prescale_low; struct regmap_field *prescale_high; struct regmap_field *pwm_out_en; + struct regmap_field *pwm_cpt_en; struct regmap_field *pwm_cpt_int_en; + struct regmap_field *pwm_cpt_int_stat; struct pwm_chip chip; struct pwm_device *cur; unsigned long configured; @@ -314,6 +317,74 @@ static const struct pwm_ops sti_pwm_ops = { .owner = THIS_MODULE, }; +static irqreturn_t sti_pwm_interrupt(int irq, void *data) +{ + struct sti_pwm_chip *pc = data; + struct device *dev = pc->dev; + struct sti_cpt_data *d; + int channel; + int cpt_int_stat; + int reg; + int ret = IRQ_NONE; + + ret = regmap_field_read(pc->pwm_cpt_int_stat, &cpt_int_stat); + if (ret) + return ret; + + while (cpt_int_stat) { + channel = ffs(cpt_int_stat) - 1; + + d = pc->cpt_data[channel]; + + /* + * Capture input: + * _______ _______ + * | | | | + * __| |_________________| |________ + * ^0 ^1 ^2 + * + * Capture start by the first available rising edge + * When a capture event occurs, capture value (CPT_VALx) + * is stored, index incremented, capture edge changed. + * + * After the capture, if the index > 1, we have collected + * the necessary data so we signal the thread waiting for it + * and disable the capture by setting capture edge to none + * + */ + + regmap_read(pc->regmap, + PWM_CPT_VAL(channel), &d->snapshot[d->index]); + + switch (d->index) { + case 0: + case 1: + regmap_read(pc->regmap, PWM_CPT_EDGE(channel), ®); + reg ^= PWM_CPT_EDGE_MASK; + regmap_write(pc->regmap, PWM_CPT_EDGE(channel), reg); + + d->index++; + break; + case 2: + regmap_write(pc->regmap, + PWM_CPT_EDGE(channel), CPT_EDGE_DISABLED); + wake_up(&d->wait); + break; + default: + dev_err(dev, "Internal error\n"); + } + + clear_bit(channel, (unsigned long int *)&cpt_int_stat); + + ret = IRQ_HANDLED; + } + + /* Just ACK everything */ + regmap_write(pc->regmap, PWM_INT_ACK, PWM_INT_ACK_MASK); + + return ret; +} + static int sti_pwm_probe_dt(struct sti_pwm_chip *pc) { struct device *dev = pc->dev; @@ -354,6 +425,11 @@ static int sti_pwm_probe_dt(struct sti_pwm_chip *pc) if (IS_ERR(pc->pwm_cpt_int_en)) return PTR_ERR(pc->pwm_cpt_int_en); + pc->pwm_cpt_int_stat = devm_regmap_field_alloc(dev, pc->regmap, + reg_fields[PWM_CPT_INT_STAT]); + if (IS_ERR(pc->pwm_cpt_int_stat)) + return PTR_ERR(pc->pwm_cpt_int_stat); + return 0; } @@ -371,7 +447,7 @@ static int sti_pwm_probe(struct platform_device *pdev) struct sti_pwm_chip *pc; struct resource *res; unsigned int chan; - int ret; + int ret, irq; pc = devm_kzalloc(dev, sizeof(*pc), GFP_KERNEL); if (!pc) @@ -392,6 +468,19 @@ static int sti_pwm_probe(struct platform_device *pdev) if (IS_ERR(pc->regmap)) return PTR_ERR(pc->regmap); + irq = platform_get_irq(pdev, 0); + if (irq < 0) { + dev_err(&pdev->dev, "Failed to obtain IRQ\n"); + return -ENODEV; + } + + ret = devm_request_irq(&pdev->dev, irq, sti_pwm_interrupt, + 0, pdev->name, (void *) pc); + if (ret < 0) { + dev_err(&pdev->dev, "Failed to request IRQ\n"); + return ret; + } + /* * Setup PWM data with default values: some values could be replaced * with specific ones provided from Device Tree.