From patchwork Sat Jul 11 22:10:13 2009 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Linus Walleij X-Patchwork-Id: 29706 Return-Path: X-Original-To: incoming@patchwork.ozlabs.org Delivered-To: patchwork-incoming@bilbo.ozlabs.org Received: from wf-out-1516.google.com (wf-out-1516.google.com [209.85.200.165]) by bilbo.ozlabs.org (Postfix) with ESMTP id A6440B6F1F for ; Sun, 12 Jul 2009 08:10:24 +1000 (EST) Received: by wf-out-1516.google.com with SMTP id j19so178538wfa.41 for ; Sat, 11 Jul 2009 15:10:23 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=googlegroups.com; s=beta; h=domainkey-signature:received:received:x-sender:x-apparently-to :received:received:received-spf:authentication-results:received :received:received:from:to:cc:subject:date:message-id:x-mailer :reply-to:sender:precedence:x-google-loop:mailing-list:list-id :list-post:list-help:list-unsubscribe:x-beenthere-env:x-beenthere; bh=Zl/NUw3BhiOBeiqbA5lRJoyE8X+hTNl3htVcbLoBfCc=; b=kgWsNIvWvGfGpXT+EiacbTf4yNsb2ElFPOoNdPHYl8+t8SKpITVGXDFFcOlbivlXWF ztphYoZoc62l2DLQZVxrj06vEF5sw9pfRNurBFHCsiP+44vWcPSdwmeX/pZBMW2sLGj/ 9gzyejmH5k36BpLdvxWZ0Onj/YGj5SVjjfFAI= DomainKey-Signature: a=rsa-sha1; c=nofws; d=googlegroups.com; s=beta; h=x-sender:x-apparently-to:received-spf:authentication-results:from :to:cc:subject:date:message-id:x-mailer:reply-to:sender:precedence :x-google-loop:mailing-list:list-id:list-post:list-help :list-unsubscribe:x-beenthere-env:x-beenthere; b=VBjFeLaZhhWtg1sfsksECf7KlY18phTNZ69mCs5CL2O6TCtaIcsmTcaxM1meAIcE8S iJyvKeReJOl0hb7lkLDvRrLoEKx+eh8404ixWK2Mge8iujNKxkM+ceQKkhRwvPhKeGMY oNYvBuhw1MDKXW6C2Oun5lam8Oi14Am4pF90o= Received: by 10.151.105.18 with SMTP id h18mr1094585ybm.5.1247350218816; Sat, 11 Jul 2009 15:10:18 -0700 (PDT) Received: by 10.176.133.33 with SMTP id g33gr2560yqd.0; Sat, 11 Jul 2009 15:10:18 -0700 (PDT) X-Sender: triad@df.lth.se X-Apparently-To: rtc-linux@googlegroups.com Received: by 10.204.102.200 with SMTP id h8mr117604bko.29.1247350217942; Sat, 11 Jul 2009 15:10:17 -0700 (PDT) Received: from df.lth.se (mail.df.lth.se [194.47.250.12]) by gmr-mx.google.com with ESMTP id 14si284774bwz.1.2009.07.11.15.10.17; Sat, 11 Jul 2009 15:10:17 -0700 (PDT) Received-SPF: pass (google.com: best guess record for domain of triad@df.lth.se designates 194.47.250.12 as permitted sender) client-ip=194.47.250.12; Authentication-Results: gmr-mx.google.com; spf=pass (google.com: best guess record for domain of triad@df.lth.se designates 194.47.250.12 as permitted sender) smtp.mail=triad@df.lth.se Received: from mer.df.lth.se (mer.df.lth.se [194.47.250.37]) by df.lth.se (8.14.2/8.13.7) with ESMTP id n6BMAHh7029435 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-SHA bits=256 verify=NO); Sun, 12 Jul 2009 00:10:17 +0200 (CEST) Received: from mer.df.lth.se (triad@localhost.localdomain [127.0.0.1]) by mer.df.lth.se (8.14.3/8.14.3/Debian-5) with ESMTP id n6BMAGhP019696; Sun, 12 Jul 2009 00:10:16 +0200 Received: (from triad@localhost) by mer.df.lth.se (8.14.3/8.14.3/Submit) id n6BMAFaO019695; Sun, 12 Jul 2009 00:10:15 +0200 From: Linus Walleij To: Alessandro Zummo , rtc-linux@googlegroups.com Cc: Samuel Ortiz , Linus Walleij Subject: [rtc-linux] [PATCH] AB3100 RTC support v1 Date: Sun, 12 Jul 2009 00:10:13 +0200 Message-Id: <1247350213-19441-1-git-send-email-linus.walleij@stericsson.com> X-Mailer: git-send-email 1.6.2.rc1 Reply-To: rtc-linux@googlegroups.com Sender: rtc-linux@googlegroups.com Precedence: bulk X-Google-Loop: groups Mailing-List: list rtc-linux@googlegroups.com; contact rtc-linux+owner@googlegroups.com List-Id: List-Post: List-Help: List-Unsubscribe: , X-BeenThere-Env: rtc-linux@googlegroups.com X-BeenThere: rtc-linux@googlegroups.com This adds support for the RTC found inside the AB3100 Mixed Signal chip. The symbols used for communicating with the chip is found in the mfd/ab3100-core.c driver that also provides the platform device. Signed-off-by: Linus Walleij --- drivers/rtc/Kconfig | 9 ++ drivers/rtc/Makefile | 1 + drivers/rtc/rtc-ab3100.c | 281 ++++++++++++++++++++++++++++++++++++++++++++++ 3 files changed, 291 insertions(+), 0 deletions(-) create mode 100644 drivers/rtc/rtc-ab3100.c diff --git a/drivers/rtc/Kconfig b/drivers/rtc/Kconfig index 81adbdb..a36dffd 100644 --- a/drivers/rtc/Kconfig +++ b/drivers/rtc/Kconfig @@ -535,6 +535,15 @@ config RTC_DRV_PCF50633 If you say yes here you get support for the RTC subsystem of the NXP PCF50633 used in embedded systems. +config RTC_DRV_AB3100 + tristate "ST-Ericsson AB3100 RTC" + depends on AB3100_CORE + default y if AB3100_CORE + help + Select this to enable the ST-Ericsson AB3100 Mixed Signal IC RTC + support. This chip contains a battery- and capacitor-backed RTC. + + comment "on-CPU RTC drivers" config RTC_DRV_OMAP diff --git a/drivers/rtc/Makefile b/drivers/rtc/Makefile index 3c0f2b2..fe85afb 100644 --- a/drivers/rtc/Makefile +++ b/drivers/rtc/Makefile @@ -17,6 +17,7 @@ rtc-core-$(CONFIG_RTC_INTF_SYSFS) += rtc-sysfs.o # Keep the list ordered. +obj-$(CONFIG_RTC_DRV_AB3100) += rtc-ab3100.o obj-$(CONFIG_RTC_DRV_AT32AP700X)+= rtc-at32ap700x.o obj-$(CONFIG_RTC_DRV_AT91RM9200)+= rtc-at91rm9200.o obj-$(CONFIG_RTC_DRV_AT91SAM9) += rtc-at91sam9.o diff --git a/drivers/rtc/rtc-ab3100.c b/drivers/rtc/rtc-ab3100.c new file mode 100644 index 0000000..d178cf7 --- /dev/null +++ b/drivers/rtc/rtc-ab3100.c @@ -0,0 +1,281 @@ +/* + * Copyright (C) 2007-2009 ST-Ericsson AB + * License terms: GNU General Public License (GPL) version 2 + * RTC clock driver for the AB3100 Analog Baseband Chip + * Author: Linus Walleij + */ +#include +#include +#include +#include +#include +#include + +/* Clock rate in Hz */ +#define AB3100_RTC_CLOCK_RATE 32768 + +/* + * The AB3100 RTC registers. These are the same for + * AB3000 and AB3100. + * Control register: + * Bit 0: RTC Monitor cleared=0, active=1, if you set it + * to 1 it remains active until RTC power is lost. + * Bit 1: 32 kHz Oscillator, 0 = on, 1 = bypass + * Bit 2: Alarm on, 0 = off, 1 = on + * Bit 3: 32 kHz buffer disabling, 0 = enabled, 1 = disabled + */ +#define AB3100_RTC 0x53 +/* default setting, buffer disabled, alarm on */ +#define RTC_SETTING 0x30 +/* Alarm when AL0-AL3 == TI0-TI3 */ +#define AB3100_AL0 0x56 +#define AB3100_AL1 0x57 +#define AB3100_AL2 0x58 +#define AB3100_AL3 0x59 +/* This 48-bit register that counts up at 32768 Hz */ +#define AB3100_TI0 0x5a +#define AB3100_TI1 0x5b +#define AB3100_TI2 0x5c +#define AB3100_TI3 0x5d +#define AB3100_TI4 0x5e +#define AB3100_TI5 0x5f + +/* + * RTC clock functions and device struct declaration + */ +static int ab3100_rtc_set_mmss(struct device *dev, unsigned long secs) +{ + struct ab3100 *ab3100_data = dev_get_drvdata(dev); + u8 regs[] = {AB3100_TI0, AB3100_TI1, AB3100_TI2, + AB3100_TI3, AB3100_TI4, AB3100_TI5}; + unsigned char buf[6]; + u64 fat_time = (u64) secs * AB3100_RTC_CLOCK_RATE * 2; + int err = 0; + int i; + + buf[0] = (fat_time) & 0xFF; + buf[1] = (fat_time >> 8) & 0xFF; + buf[2] = (fat_time >> 16) & 0xFF; + buf[3] = (fat_time >> 24) & 0xFF; + buf[4] = (fat_time >> 32) & 0xFF; + buf[5] = (fat_time >> 40) & 0xFF; + + for (i = 0; i < 6; i++) { + err = ab3100_set_register(ab3100_data, regs[i], buf[i]); + if (err) + return err; + } + + /* Set the flag to mark that the clock is now set */ + err = ab3100_mask_and_set_register(ab3100_data, AB3100_RTC, 0xFE, 0x01); + + return err; +} + +static int ab3100_rtc_read_time(struct device *dev, struct rtc_time *tm) +{ + struct ab3100 *ab3100_data = dev_get_drvdata(dev); + unsigned long time; + u8 rtcval; + int err; + + err = ab3100_get_register(ab3100_data, AB3100_RTC, &rtcval); + + if (!(rtcval & 0x01)) { + dev_info(dev, "clock not set (lost power)"); + return -EINVAL; + } else { + u64 fat_time; + u8 buf[6]; + + /* Read out time registers */ + err = ab3100_get_register_page(ab3100_data, AB3100_TI0, buf, 6); + if (err != 0) + return err; + + fat_time = ((u64) buf[5] << 40) | ((u64) buf[4] << 32) | + ((u64) buf[3] << 24) | ((u64) buf[2] << 16) | + ((u64) buf[1] << 8) | (u64) buf[0]; + time = (unsigned long) (fat_time / + (u64) (AB3100_RTC_CLOCK_RATE * 2)); + } + + rtc_time_to_tm(time, tm); + + return rtc_valid_tm(tm); +} + +static int ab3100_rtc_read_alarm(struct device *dev, struct rtc_wkalrm *alarm) +{ + struct ab3100 *ab3100_data = dev_get_drvdata(dev); + unsigned long time; + u64 fat_time; + u8 buf[6]; + u8 rtcval; + int err; + + /* Figure out if alarm is enabled or not */ + err = ab3100_get_register(ab3100_data, AB3100_RTC, &rtcval); + if (err) + return err; + if (rtcval & 0x02) + alarm->enabled = 1; + else + alarm->enabled = 0; + /* No idea how this could be represented */ + alarm->pending = 0; + /* Read out alarm registers, only 4 bytes */ + err = ab3100_get_register_page(ab3100_data, AB3100_AL0, buf, 4); + if (err) + return err; + fat_time = ((u64) buf[3] << 40) | ((u64) buf[2] << 32) | + ((u64) buf[1] << 24) | ((u64) buf[0] << 16); + time = (unsigned long) (fat_time / (u64) (AB3100_RTC_CLOCK_RATE * 2)); + + rtc_time_to_tm(time, &alarm->time); + + return 0; +} + +static int ab3100_rtc_set_alarm(struct device *dev, struct rtc_wkalrm *alarm) +{ + struct ab3100 *ab3100_data = dev_get_drvdata(dev); + u8 regs[] = {AB3100_AL0, AB3100_AL1, AB3100_AL2, AB3100_AL3}; + unsigned char buf[4]; + unsigned long secs; + u64 fat_time; + int err; + int i; + + rtc_tm_to_time(&alarm->time, &secs); + fat_time = (u64) secs * AB3100_RTC_CLOCK_RATE * 2; + buf[0] = (fat_time >> 16) & 0xFF; + buf[1] = (fat_time >> 24) & 0xFF; + buf[2] = (fat_time >> 32) & 0xFF; + buf[3] = (fat_time >> 40) & 0xFF; + + /* Set the alarm */ + for (i = 0; i < 4; i++) { + err = ab3100_set_register(ab3100_data, regs[i], buf[i]); + if (err) + return err; + } + /* Then enable the alarm */ + err = ab3100_mask_and_set_register(ab3100_data, AB3100_RTC, ~(1 << 2), + alarm->enabled << 2); + return err; +} + +static int ab3100_rtc_irq_enable(struct device *dev, unsigned int enabled) +{ + struct ab3100 *ab3100_data = dev_get_drvdata(dev); + + /* + * It's not possible to enable/disable the alarm IRQ for this RTC. + * It does not actually trigger any IRQ: instead its only function is + * to power up the system, if it wasn't on. This will manifest as + * a "power up cause" in the AB3100 power driver (battery charging etc) + * and need to be handled there instead. + */ + if (enabled) + return ab3100_mask_and_set_register(ab3100_data, + AB3100_RTC, ~(1 << 2), + 1 << 2); + else + return ab3100_mask_and_set_register(ab3100_data, + AB3100_RTC, ~(1 << 2), + 0); +} + +static const struct rtc_class_ops ab3100_rtc_ops = { + .read_time = ab3100_rtc_read_time, + .set_mmss = ab3100_rtc_set_mmss, + .read_alarm = ab3100_rtc_read_alarm, + .set_alarm = ab3100_rtc_set_alarm, + .alarm_irq_enable = ab3100_rtc_irq_enable, +}; + +static int __init ab3100_rtc_probe(struct platform_device *pdev) +{ + int err; + u8 regval; + struct rtc_device *rtc; + struct ab3100 *ab3100_data = platform_get_drvdata(pdev); + + /* The first RTC register needs special treatment */ + err = ab3100_get_register(ab3100_data, AB3100_RTC, ®val); + if (err) { + dev_err(&pdev->dev, "unable to read RTC register\n"); + return -ENODEV; + } + + if ((regval & 0xFE) != RTC_SETTING) { + dev_warn(&pdev->dev, "not default value in RTC reg 0x%x\n", + regval); + } + + if ((regval & 1) == 0) { + /* + * Set bit to detect power loss. + * This bit remains until RTC power is lost. + */ + regval = 1 | RTC_SETTING; + err = ab3100_set_register(ab3100_data, AB3100_RTC, regval); + /* Ignore any error on this write */ + } + + rtc = rtc_device_register("ab3100-rtc", &pdev->dev, &ab3100_rtc_ops, + THIS_MODULE); + if (IS_ERR(rtc)) { + err = PTR_ERR(rtc); + dev_err(&pdev->dev, "no RTC device\n"); + return err; + } + + dev_info(&pdev->dev, "initialization done\n"); + + return 0; +} + +static int __exit ab3100_rtc_remove(struct platform_device *pdev) +{ + struct rtc_device *rtc = platform_get_drvdata(pdev); + struct timeval tv; + unsigned long time; + + dev_info(&pdev->dev, "rtc-ab3100: Closing down, saving date/time to " \ + "battery-backuped RTC\n"); + + do_gettimeofday(&tv); + time = timeval_to_ns(&tv); + ab3100_rtc_set_mmss(&pdev->dev, time); + + rtc_device_unregister(rtc); + return 0; +} + +static struct platform_driver ab3100_rtc_driver = { + .driver = { + .name = "ab3100-rtc", + .owner = THIS_MODULE, + }, + .remove = __exit_p(ab3100_rtc_remove), +}; + +static int __init ab3100_rtc_init(void) +{ + return platform_driver_probe(&ab3100_rtc_driver, + ab3100_rtc_probe); +} + +static void __exit ab3100_rtc_exit(void) +{ + platform_driver_unregister(&ab3100_rtc_driver); +} + +module_init(ab3100_rtc_init); +module_exit(ab3100_rtc_exit); + +MODULE_AUTHOR("Linus Walleij "); +MODULE_DESCRIPTION("AB3100 RTC Driver"); +MODULE_LICENSE("GPL");