From patchwork Tue Aug 28 11:48:18 2012 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Sascha Hauer X-Patchwork-Id: 1381031 Return-Path: X-Original-To: patchwork-linux-arm@patchwork.kernel.org Delivered-To: patchwork-process-083081@patchwork1.kernel.org Received: from merlin.infradead.org (merlin.infradead.org [205.233.59.134]) by patchwork1.kernel.org (Postfix) with ESMTP id 932643FDF5 for ; Tue, 28 Aug 2012 11:53:21 +0000 (UTC) Received: from localhost ([::1] helo=merlin.infradead.org) by merlin.infradead.org with esmtp (Exim 4.76 #1 (Red Hat Linux)) id 1T6KJA-0004mm-Ow; Tue, 28 Aug 2012 11:50:13 +0000 Received: from metis.ext.pengutronix.de ([2001:6f8:1178:4:290:27ff:fe1d:cc33]) by merlin.infradead.org with esmtps (Exim 4.76 #1 (Red Hat Linux)) id 1T6KHX-0003wr-Mv for linux-arm-kernel@lists.infradead.org; Tue, 28 Aug 2012 11:48:35 +0000 Received: from dude.hi.pengutronix.de ([2001:6f8:1178:2:21e:67ff:fe11:9c5c]) by metis.ext.pengutronix.de with esmtp (Exim 4.72) (envelope-from ) id 1T6KHV-0005j8-8Q; Tue, 28 Aug 2012 13:48:29 +0200 Received: from sha by dude.hi.pengutronix.de with local (Exim 4.80) (envelope-from ) id 1T6KHT-0002ML-IZ; Tue, 28 Aug 2012 13:48:27 +0200 From: Sascha Hauer To: linux-arm-kernel@lists.infradead.org Subject: [PATCH 3/9] pwm i.MX: add functions to enable/disable pwm. Date: Tue, 28 Aug 2012 13:48:18 +0200 Message-Id: <1346154504-5623-4-git-send-email-s.hauer@pengutronix.de> X-Mailer: git-send-email 1.7.10.4 In-Reply-To: <1346154504-5623-1-git-send-email-s.hauer@pengutronix.de> References: <1346154504-5623-1-git-send-email-s.hauer@pengutronix.de> X-SA-Exim-Connect-IP: 2001:6f8:1178:2:21e:67ff:fe11:9c5c X-SA-Exim-Mail-From: sha@pengutronix.de X-SA-Exim-Scanned: No (on metis.ext.pengutronix.de); SAEximRunCond expanded to false X-PTX-Original-Recipient: linux-arm-kernel@lists.infradead.org X-Spam-Note: CRM114 invocation failed X-Spam-Score: -2.1 (--) X-Spam-Report: SpamAssassin version 3.3.2 on merlin.infradead.org summary: Content analysis details: (-2.1 points) pts rule name description ---- ---------------------- -------------------------------------------------- -0.2 RP_MATCHES_RCVD Envelope sender domain matches handover relay domain -1.9 BAYES_00 BODY: Bayes spam probability is 0 to 1% [score: 0.0000] Cc: Sascha Hauer , thierry.reding@avionic-design.de, linux-kernel@vger.kernel.org, =?UTF-8?q?Beno=C3=AEt=20Th=C3=A9baudeau?= , HACHIMI Samir , shawn.guo@linaro.org X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.14 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , MIME-Version: 1.0 Sender: linux-arm-kernel-bounces@lists.infradead.org Errors-To: linux-arm-kernel-bounces+patchwork-linux-arm=patchwork.kernel.org@lists.infradead.org We used to enable/disable the pwm only by switching the clock on or off. Instead, use the dedicated register bits. These differ on different SoCs, so introduce a SoC specific function for this. Signed-off-by: Sascha Hauer --- drivers/pwm/pwm-imx.c | 48 ++++++++++++++++++++++++++++++++++++++++++++---- 1 file changed, 44 insertions(+), 4 deletions(-) diff --git a/drivers/pwm/pwm-imx.c b/drivers/pwm/pwm-imx.c index 0f244e6..3fc4ae8 100644 --- a/drivers/pwm/pwm-imx.c +++ b/drivers/pwm/pwm-imx.c @@ -25,6 +25,7 @@ #define MX1_PWMS 0x04 /* PWM Sample Register */ #define MX1_PWMP 0x08 /* PWM Period Register */ +#define MX1_PWMC_EN (1 << 4) /* i.MX27, i.MX31, i.MX35 share the same PWM function block: */ @@ -49,6 +50,7 @@ struct imx_chip { int (*config)(struct pwm_chip *chip, struct pwm_device *pwm, int duty_ns, int period_ns); + void (*set_enable)(struct pwm_chip *chip, bool enable); }; #define to_imx_chip(chip) container_of(chip, struct imx_chip, chip) @@ -81,6 +83,21 @@ static int imx_pwm_config_v1(struct pwm_chip *chip, return 0; } +static void imx_pwm_set_enable_v1(struct pwm_chip *chip, bool enable) +{ + struct imx_chip *imx = to_imx_chip(chip); + u32 val; + + val = readl(imx->mmio_base + MX1_PWMC); + + if (enable) + val |= MX1_PWMC_EN; + else + val &= ~MX1_PWMC_EN; + + writel(val, imx->mmio_base + MX1_PWMC); +} + static int imx_pwm_config_v2(struct pwm_chip *chip, struct pwm_device *pwm, int duty_ns, int period_ns) { @@ -115,7 +132,10 @@ static int imx_pwm_config_v2(struct pwm_chip *chip, cr = MX3_PWMCR_PRESCALER(prescale) | MX3_PWMCR_DOZEEN | MX3_PWMCR_WAITEN | - MX3_PWMCR_DBGEN | MX3_PWMCR_EN; + MX3_PWMCR_DBGEN; + + if (imx->enabled) + cr |= MX3_PWMCR_EN; if (cpu_is_mx25()) cr |= MX3_PWMCR_CLKSRC_IPG; @@ -127,6 +147,21 @@ static int imx_pwm_config_v2(struct pwm_chip *chip, return 0; } +static void imx_pwm_set_enable_v2(struct pwm_chip *chip, bool enable) +{ + struct imx_chip *imx = to_imx_chip(chip); + u32 val; + + val = readl(imx->mmio_base + MX3_PWMCR); + + if (enable) + val |= MX3_PWMCR_EN; + else + val &= ~MX3_PWMCR_EN; + + writel(val, imx->mmio_base + MX3_PWMCR); +} + static int imx_pwm_config(struct pwm_chip *chip, struct pwm_device *pwm, int duty_ns, int period_ns) { @@ -144,6 +179,8 @@ static int imx_pwm_enable(struct pwm_chip *chip, struct pwm_device *pwm) if (rc) return rc; + imx->set_enable(chip, true); + imx->enabled = 1; return 0; @@ -153,7 +190,7 @@ static void imx_pwm_disable(struct pwm_chip *chip, struct pwm_device *pwm) { struct imx_chip *imx = to_imx_chip(chip); - writel(0, imx->mmio_base + MX3_PWMCR); + imx->set_enable(chip, false); clk_disable_unprepare(imx->clk); imx->enabled = 0; @@ -198,10 +235,13 @@ static int __devinit imx_pwm_probe(struct platform_device *pdev) if (imx->mmio_base == NULL) return -EADDRNOTAVAIL; - if (cpu_is_mx1() || cpu_is_mx21()) + if (cpu_is_mx1() || cpu_is_mx21()) { imx->config = imx_pwm_config_v1; - else + imx->set_enable = imx_pwm_set_enable_v1; + } else { imx->config = imx_pwm_config_v2; + imx->set_enable = imx_pwm_set_enable_v2; + } ret = pwmchip_add(&imx->chip); if (ret < 0)