From patchwork Wed Mar 11 12:23:12 2009 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: David Brownell X-Patchwork-Id: 11120 Received: from vger.kernel.org (vger.kernel.org [209.132.176.167]) by demeter.kernel.org (8.14.2/8.14.2) with ESMTP id n2BCWqGi024749 for ; Wed, 11 Mar 2009 12:32:53 GMT Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752020AbZCKMcw (ORCPT ); Wed, 11 Mar 2009 08:32:52 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1752371AbZCKMcw (ORCPT ); Wed, 11 Mar 2009 08:32:52 -0400 Received: from smtp120.sbc.mail.sp1.yahoo.com ([69.147.64.93]:44263 "HELO smtp120.sbc.mail.sp1.yahoo.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with SMTP id S1752020AbZCKMcv (ORCPT ); Wed, 11 Mar 2009 08:32:51 -0400 Received: (qmail 93387 invoked from network); 11 Mar 2009 12:32:49 -0000 DomainKey-Signature: a=rsa-sha1; q=dns; c=nofws; s=s1024; d=pacbell.net; h=Received:X-YMail-OSG:X-Yahoo-Newman-Property:From:To:Subject:Date:User-Agent:References:In-Reply-To:MIME-Version:Content-Type:Content-Transfer-Encoding:Content-Disposition:Message-Id; b=BFbnuE252dKxaDymIrRBW10egvLLv6KBeJKxhpDYcGf9uUywZL7nAj/HAl0Fv8VI3mdMneHVBx7xKWwkoSxnpRAdgpjdVNaE/BIR+JPWkyvmn6Tu2ZGG+fG3Vi8aOha2c8fgW/QHddkH5jIxPN+GObVh+CcL/jcW5As0W87vJ6o= ; Received: from unknown (HELO pogo) (david-b@69.226.224.20 with plain) by smtp120.sbc.mail.sp1.yahoo.com with SMTP; 11 Mar 2009 12:32:49 -0000 X-YMail-OSG: fuFGjk4VM1l.Kf2QWGZL_fvpmJwzP..iLppFiw3TiQREyUDRYXyM0kFYkfMGVoXrW7oBD7epmKCorfmaAikHgNOvJguYVQCqTrsqOyg2Uloh0uvSfxYwONSvHX1LFKp2xITzEURy6hExFlQ35QA61cgy.sDqxG0A4RN9ldZ5PYfTeuJt2FxhbdulMA-- X-Yahoo-Newman-Property: ymail-3 From: David Brownell To: OMAP Subject: [patch 2.6.29-rc7-omap 4/5] MMC: regulator utilities Date: Wed, 11 Mar 2009 04:23:12 -0800 User-Agent: KMail/1.9.10 References: <200903110518.34945.david-b@pacbell.net> In-Reply-To: <200903110518.34945.david-b@pacbell.net> MIME-Version: 1.0 Content-Disposition: inline Message-Id: <200903110523.12937.david-b@pacbell.net> Sender: linux-omap-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-omap@vger.kernel.org From: David Brownell Subject: MMC: regulator utilities Glue between MMC and regulator stacks ... verified with some OMAP3 boards using adjustable and configured-as-fixed regulators on several MMC controllers. These calls are intended to be used by MMC host adapters using at least one regulator per host. Examples include slots with regulators supporting multiple voltages and ones using multiple voltage rails (e.g. DAT4..DAT7 using a separate supply, or a split rail chip like certain SDIO WLAN or eMMC solutions). Signed-off-by: David Brownell Acked-by: Pierre Ossman --- Changes since previous version: simplified set_ocr() calling convention, fixed an off-by-100mA error in that code, and don't set voltage on regulators that don't need (and may disallow) it. drivers/mmc/core/core.c | 100 +++++++++++++++++++++++++++++++++++++++++++++ include/linux/mmc/host.h | 5 ++ 2 files changed, 105 insertions(+) -- To unsubscribe from this list: send the line "unsubscribe linux-omap" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html --- a/drivers/mmc/core/core.c +++ b/drivers/mmc/core/core.c @@ -21,6 +21,7 @@ #include #include #include +#include #include #include @@ -523,6 +524,105 @@ u32 mmc_vddrange_to_ocrmask(int vdd_min, } EXPORT_SYMBOL(mmc_vddrange_to_ocrmask); +#ifdef CONFIG_REGULATOR + +/** + * mmc_regulator_get_ocrmask - return mask of supported voltages + * @supply: regulator to use + * + * This returns either a negative errno, or a mask of voltages that + * can be provided to MMC/SD/SDIO devices using the specified voltage + * regulator. This would normally be called before registering the + * MMC host adapter. + */ +int mmc_regulator_get_ocrmask(struct regulator *supply) +{ + int result = 0; + int count; + int i; + + count = regulator_count_voltages(supply); + if (count < 0) + return count; + + for (i = 0; i < count; i++) { + int vdd_uV; + int vdd_mV; + + vdd_uV = regulator_list_voltage(supply, i); + if (vdd_uV <= 0) + continue; + + vdd_mV = vdd_uV / 1000; + result |= mmc_vddrange_to_ocrmask(vdd_mV, vdd_mV); + } + + return result; +} +EXPORT_SYMBOL(mmc_regulator_get_ocrmask); + +/** + * mmc_regulator_set_ocr - set regulator to match host->ios voltage + * @vdd_bit: zero for power off, else a bit number (host->ios.vdd) + * @supply: regulator to use + * + * Returns zero on success, else negative errno. + * + * MMC host drivers may use this to enable or disable a regulator using + * a particular supply voltage. This would normally be called from the + * set_ios() method. + */ +int mmc_regulator_set_ocr(struct regulator *supply, unsigned short vdd_bit) +{ + int result = 0; + int min_uV, max_uV; + int enabled; + + enabled = regulator_is_enabled(supply); + if (enabled < 0) + return enabled; + + if (vdd_bit) { + int tmp; + int voltage; + + /* REVISIT mmc_vddrange_to_ocrmask() may have set some + * bits this regulator doesn't quite support ... don't + * be too picky, most cards and regulators are OK with + * a 0.1V range goof (it's a small error percentage). + */ + tmp = vdd_bit - ilog2(MMC_VDD_165_195); + if (tmp == 0) { + min_uV = 1650 * 1000; + max_uV = 1950 * 1000; + } else { + min_uV = 1900 * 1000 + tmp * 100 * 1000; + max_uV = min_uV + 100 * 1000; + } + + /* avoid needless changes to this voltage; the regulator + * might not allow this operation + */ + voltage = regulator_get_voltage(supply); + if (voltage < 0) + result = voltage; + else if (voltage < min_uV || voltage > max_uV) + result = regulator_set_voltage(supply, min_uV, max_uV); + else + result = 0; + + if (result == 0 && !enabled) + result = regulator_enable(supply); + } else if (enabled) { + result = regulator_disable(supply); + } + + return result; +} +EXPORT_SYMBOL(mmc_regulator_set_ocr); + +#endif + /* * Mask off any voltages we don't support and select * the lowest voltage --- a/include/linux/mmc/host.h +++ b/include/linux/mmc/host.h @@ -192,5 +192,10 @@ static inline void mmc_signal_sdio_irq(s wake_up_process(host->sdio_irq_thread); } +struct regulator; + +int mmc_regulator_get_ocrmask(struct regulator *supply); +int mmc_regulator_set_ocr(struct regulator *supply, unsigned short vdd_bit); + #endif