From patchwork Fri Dec 14 06:03:14 2012 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: "AnilKumar, Chimata" X-Patchwork-Id: 1877381 Return-Path: X-Original-To: patchwork-linux-omap@patchwork.kernel.org Delivered-To: patchwork-process-083081@patchwork2.kernel.org Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by patchwork2.kernel.org (Postfix) with ESMTP id 5E151DF230 for ; Fri, 14 Dec 2012 06:04:15 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752282Ab2LNGEN (ORCPT ); Fri, 14 Dec 2012 01:04:13 -0500 Received: from comal.ext.ti.com ([198.47.26.152]:51056 "EHLO comal.ext.ti.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751218Ab2LNGEJ (ORCPT ); Fri, 14 Dec 2012 01:04:09 -0500 Received: from dbdp20.itg.ti.com ([172.24.170.38]) by comal.ext.ti.com (8.13.7/8.13.7) with ESMTP id qBE63cPT007962; Fri, 14 Dec 2012 00:03:39 -0600 Received: from DBDE71.ent.ti.com (localhost [127.0.0.1]) by dbdp20.itg.ti.com (8.13.8/8.13.8) with ESMTP id qBE63TNX003104; Fri, 14 Dec 2012 11:33:37 +0530 (IST) Received: from dbdp32.itg.ti.com (172.24.170.251) by DBDE71.ent.ti.com (172.24.170.149) with Microsoft SMTP Server id 14.1.323.3; Fri, 14 Dec 2012 11:33:30 +0530 Received: from localhost.localdomain (dbdp20.itg.ti.com [172.24.170.38]) by dbdp32.itg.ti.com (8.13.8/8.13.8) with ESMTP id qBE63Mnb019507; Fri, 14 Dec 2012 11:33:29 +0530 From: AnilKumar Ch To: , , CC: , , , , , , , Colin Foe-Parker , AnilKumar Ch Subject: [PATCH v4 1/4] rtc: OMAP: Add system pm_power_off to rtc driver Date: Fri, 14 Dec 2012 11:33:14 +0530 Message-ID: <1355464997-19367-2-git-send-email-anilkumar@ti.com> X-Mailer: git-send-email 1.7.0.4 In-Reply-To: <1355464997-19367-1-git-send-email-anilkumar@ti.com> References: <1355464997-19367-1-git-send-email-anilkumar@ti.com> MIME-Version: 1.0 Sender: linux-omap-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-omap@vger.kernel.org From: Colin Foe-Parker Add system power off control to rtc driver which is the in-charge of controlling the BeagleBone system power. The power_off routine can be hooked up to "pm_power_off" system call. System power off sequence:- * Set PMIC STATUS_OFF when PMIC_POWER_EN is pulled low * Enable PMIC_POWER_EN in rtc module * Set rtc ALARM2 time * Enable ALARM2 interrupt Signed-off-by: Colin Foe-Parker [anilkumar@ti.com: move poweroff additions to rtc driver] Signed-off-by: AnilKumar Ch Reviewed-by: Russ Dill Acked-by: Russ Dill --- Documentation/devicetree/bindings/rtc/rtc-omap.txt | 5 ++ drivers/rtc/rtc-omap.c | 74 +++++++++++++++++++- 2 files changed, 78 insertions(+), 1 deletion(-) diff --git a/Documentation/devicetree/bindings/rtc/rtc-omap.txt b/Documentation/devicetree/bindings/rtc/rtc-omap.txt index b47aa41..8d9f4f9 100644 --- a/Documentation/devicetree/bindings/rtc/rtc-omap.txt +++ b/Documentation/devicetree/bindings/rtc/rtc-omap.txt @@ -6,6 +6,10 @@ Required properties: - interrupts: rtc timer, alarm interrupts in order - interrupt-parent: phandle for the interrupt controller +Optional properties: +- ti,system-power-controller: Telling whether or not rtc is controlling + the system power. + Example: rtc@1c23000 { @@ -14,4 +18,5 @@ rtc@1c23000 { interrupts = <19 19>; interrupt-parent = <&intc>; + ti,system-power-controller; }; diff --git a/drivers/rtc/rtc-omap.c b/drivers/rtc/rtc-omap.c index 6009714..e6d4878 100644 --- a/drivers/rtc/rtc-omap.c +++ b/drivers/rtc/rtc-omap.c @@ -72,6 +72,14 @@ #define OMAP_RTC_KICK0_REG 0x6c #define OMAP_RTC_KICK1_REG 0x70 +#define OMAP_RTC_ALARM2_SECONDS_REG 0x80 +#define OMAP_RTC_ALARM2_MINUTES_REG 0x84 +#define OMAP_RTC_ALARM2_HOURS_REG 0x88 +#define OMAP_RTC_ALARM2_DAYS_REG 0x8c +#define OMAP_RTC_ALARM2_MONTHS_REG 0x90 +#define OMAP_RTC_ALARM2_YEARS_REG 0x94 +#define OMAP_RTC_PMIC_REG 0x98 + /* OMAP_RTC_CTRL_REG bit fields: */ #define OMAP_RTC_CTRL_SPLIT (1<<7) #define OMAP_RTC_CTRL_DISABLE (1<<6) @@ -93,15 +101,21 @@ #define OMAP_RTC_STATUS_BUSY (1<<0) /* OMAP_RTC_INTERRUPTS_REG bit fields: */ +#define OMAP_RTC_INTERRUPTS_IT_ALARM2 (1<<4) #define OMAP_RTC_INTERRUPTS_IT_ALARM (1<<3) #define OMAP_RTC_INTERRUPTS_IT_TIMER (1<<2) +/* OMAP_RTC_PMIC_REG bit fields: */ +#define OMAP_RTC_PMIC_POWER_EN_EN (1<<16) + /* OMAP_RTC_KICKER values */ #define KICK0_VALUE 0x83e70b13 #define KICK1_VALUE 0x95a4f1e0 #define OMAP_RTC_HAS_KICKER 0x1 +#define SHUTDOWN_TIME_SEC 2 + static void __iomem *rtc_base; #define rtc_read(addr) readb(rtc_base + (addr)) @@ -290,6 +304,56 @@ static int omap_rtc_set_alarm(struct device *dev, struct rtc_wkalrm *alm) return 0; } +/* + * rtc_power_off: Set the pmic power off sequence. The RTC generates + * pmic_pwr_enable control, which can be used to control an external + * PMIC. + */ +static void rtc_power_off(void) +{ + u32 val; + struct rtc_time tm; + unsigned long time; + + /* Set PMIC power enable */ + val = readl(rtc_base + OMAP_RTC_PMIC_REG); + writel(val | OMAP_RTC_PMIC_POWER_EN_EN, rtc_base + OMAP_RTC_PMIC_REG); + + /* Read rtc time */ + omap_rtc_read_time(NULL, &tm); + + /* Convert Gregorian date to seconds since 01-01-1970 00:00:00 */ + rtc_tm_to_time(&tm, &time); + + /* Add shutdown time to the current value */ + time += SHUTDOWN_TIME_SEC; + + /* Convert seconds since 01-01-1970 00:00:00 to Gregorian date */ + rtc_time_to_tm(time, &tm); + + if (tm2bcd(&tm) < 0) + return; + + pr_info("System will go to power_off state in approx. %d secs\n", + SHUTDOWN_TIME_SEC); + + /* + * pmic_pwr_enable is controlled by means of ALARM2 event. So here + * programming alarm2 expiry time and enabling alarm2 interrupt + */ + rtc_write(tm.tm_sec, OMAP_RTC_ALARM2_SECONDS_REG); + rtc_write(tm.tm_min, OMAP_RTC_ALARM2_MINUTES_REG); + rtc_write(tm.tm_hour, OMAP_RTC_ALARM2_HOURS_REG); + rtc_write(tm.tm_mday, OMAP_RTC_ALARM2_DAYS_REG); + rtc_write(tm.tm_mon, OMAP_RTC_ALARM2_MONTHS_REG); + rtc_write(tm.tm_year, OMAP_RTC_ALARM2_YEARS_REG); + + /* Enable alarm2 interrupt */ + val = readl(rtc_base + OMAP_RTC_INTERRUPTS_REG); + writel(val | OMAP_RTC_INTERRUPTS_IT_ALARM2, + rtc_base + OMAP_RTC_INTERRUPTS_REG); +} + static struct rtc_class_ops omap_rtc_ops = { .read_time = omap_rtc_read_time, .set_time = omap_rtc_set_time, @@ -327,12 +391,16 @@ static int __init omap_rtc_probe(struct platform_device *pdev) struct resource *res, *mem; struct rtc_device *rtc; u8 reg, new_ctrl; + bool pm_off = false; const struct platform_device_id *id_entry; const struct of_device_id *of_id; of_id = of_match_device(omap_rtc_of_match, &pdev->dev); - if (of_id) + if (of_id) { pdev->id_entry = of_id->data; + pm_off = of_property_read_bool(pdev->dev.of_node, + "ti,system-power-controller"); + } omap_rtc_timer = platform_get_irq(pdev, 0); if (omap_rtc_timer <= 0) { @@ -385,6 +453,10 @@ static int __init omap_rtc_probe(struct platform_device *pdev) platform_set_drvdata(pdev, rtc); dev_set_drvdata(&rtc->dev, mem); + /* RTC power off */ + if (pm_off && !pm_power_off) + pm_power_off = rtc_power_off; + /* clear pending irqs, and set 1/second periodic, * which we'll use instead of update irqs */