From patchwork Thu Jul 11 14:37:48 2019 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Biwen Li X-Patchwork-Id: 1130827 Return-Path: X-Original-To: incoming@patchwork.ozlabs.org Delivered-To: patchwork-incoming@bilbo.ozlabs.org Authentication-Results: ozlabs.org; spf=none (mailfrom) smtp.mailfrom=vger.kernel.org (client-ip=209.132.180.67; helo=vger.kernel.org; envelope-from=linux-rtc-owner@vger.kernel.org; receiver=) Authentication-Results: ozlabs.org; dmarc=fail (p=none dis=none) header.from=nxp.com Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by ozlabs.org (Postfix) with ESMTP id 45kzRV1dwwz9s3Z for ; Fri, 12 Jul 2019 00:47:18 +1000 (AEST) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1728414AbfGKOrQ (ORCPT ); Thu, 11 Jul 2019 10:47:16 -0400 Received: from inva021.nxp.com ([92.121.34.21]:44640 "EHLO inva021.nxp.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1728298AbfGKOrQ (ORCPT ); Thu, 11 Jul 2019 10:47:16 -0400 Received: from inva021.nxp.com (localhost [127.0.0.1]) by inva021.eu-rdc02.nxp.com (Postfix) with ESMTP id A9D97200951; Thu, 11 Jul 2019 16:47:13 +0200 (CEST) Received: from invc005.ap-rdc01.nxp.com (invc005.ap-rdc01.nxp.com [165.114.16.14]) by inva021.eu-rdc02.nxp.com (Postfix) with ESMTP id D24442001EC; Thu, 11 Jul 2019 16:47:07 +0200 (CEST) Received: from titan.ap.freescale.net (TITAN.ap.freescale.net [10.192.208.233]) by invc005.ap-rdc01.nxp.com (Postfix) with ESMTP id 078B1402D6; Thu, 11 Jul 2019 22:47:00 +0800 (SGT) From: Biwen Li To: a.zummo@towertech.it, alexandre.belloni@bootlin.com, leoyang.li@nxp.com Cc: linux-rtc@vger.kernel.org, linux-kernel@vger.kernel.org, xiaobo.xie@nxp.com, jiafei.pan@nxp.com, ran.wang_1@nxp.com, robh+dt@kernel.org, Biwen Li Subject: [v3,1/2] rtc/fsl: add FTM alarm driver as the wakeup source Date: Thu, 11 Jul 2019 22:37:48 +0800 Message-Id: <20190711143748.10808-1-biwen.li@nxp.com> X-Mailer: git-send-email 2.9.5 X-Virus-Scanned: ClamAV using ClamSMTP Sender: linux-rtc-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-rtc@vger.kernel.org For the paltforms including LS1012A, LS1021A, LS1028A, LS1043A, LS1046A, LS1088A, LS208xA that has the FlexTimer module, implementing alarm functions within RTC subsystem to wakeup the system when system going to sleep (work with RCPM driver). Signed-off-by: Biwen Li --- Change in v3: - add some comments about clock source and errata - adjust format - replace endian with big_endian of struct ftm_rtc - remove compatible "fsl,ftm-alarm" Change in v2: - remove code about setting rcpm drivers/rtc/Kconfig | 14 ++ drivers/rtc/Makefile | 1 + drivers/rtc/rtc-fsl-ftm-alarm.c | 347 ++++++++++++++++++++++++++++++++++++++++ 3 files changed, 362 insertions(+) create mode 100644 drivers/rtc/rtc-fsl-ftm-alarm.c diff --git a/drivers/rtc/Kconfig b/drivers/rtc/Kconfig index 03b60d5..0758a08 100644 --- a/drivers/rtc/Kconfig +++ b/drivers/rtc/Kconfig @@ -1313,6 +1313,20 @@ config RTC_DRV_IMXDI This driver can also be built as a module, if so, the module will be called "rtc-imxdi". +config RTC_DRV_FSL_FTM_ALARM + tristate "Freescale FlexTimer alarm timer" + depends on ARCH_LAYERSCAPE + default y + help + For the FlexTimer in LS1012A, LS1021A, LS1028A, LS1043A, LS1046A, + LS1088A, LS208xA, we can use FTM as the wakeup source. + + Say y here to enable FTM alarm support. The FTM alarm provides + alarm functions for wakeup system from deep sleep. + + This driver can also be built as a module, if so, the module + will be called "rtc-fsl-ftm-alarm". + config RTC_DRV_MESON tristate "Amlogic Meson RTC" depends on (ARM && ARCH_MESON) || COMPILE_TEST diff --git a/drivers/rtc/Makefile b/drivers/rtc/Makefile index 9d997fa..5cccb07 100644 --- a/drivers/rtc/Makefile +++ b/drivers/rtc/Makefile @@ -79,6 +79,7 @@ obj-$(CONFIG_RTC_DRV_HID_SENSOR_TIME) += rtc-hid-sensor-time.o obj-$(CONFIG_RTC_DRV_HYM8563) += rtc-hym8563.o obj-$(CONFIG_RTC_DRV_IMXDI) += rtc-imxdi.o obj-$(CONFIG_RTC_DRV_IMX_SC) += rtc-imx-sc.o +obj-$(CONFIG_RTC_DRV_FSL_FTM_ALARM) += rtc-fsl-ftm-alarm.o obj-$(CONFIG_RTC_DRV_ISL12022) += rtc-isl12022.o obj-$(CONFIG_RTC_DRV_ISL12026) += rtc-isl12026.o obj-$(CONFIG_RTC_DRV_ISL1208) += rtc-isl1208.o diff --git a/drivers/rtc/rtc-fsl-ftm-alarm.c b/drivers/rtc/rtc-fsl-ftm-alarm.c new file mode 100644 index 0000000..4fd0d6b --- /dev/null +++ b/drivers/rtc/rtc-fsl-ftm-alarm.c @@ -0,0 +1,347 @@ +// SPDX-License-Identifier: GPL-2.0+ +/* + * Freescale FlexTimer Module (FTM) alarm device driver. + * + * Copyright 2014 Freescale Semiconductor, Inc. + * Copyright 2019 NXP + * + */ + +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include + +#define FTM_SC_CLK(c) ((c) << FTM_SC_CLK_MASK_SHIFT) + +/* + * Select Fixed frequency clock (32KHz) as clock source + * of FlexTimer Module + */ +#define FTM_SC_CLKS_FIXED_FREQ 0x02 +#define FIXED_FREQ_CLK 32000 + +/* Select 128 (2^7) as divider factor */ +#define MAX_FREQ_DIV (1 << FTM_SC_PS_MASK) + +/* Maximum counter value in FlexTimer's CNT registers */ +#define MAX_COUNT_VAL 0xffff + +struct ftm_rtc { + struct rtc_device *rtc_dev; + void __iomem *base; + bool big_endian; + u32 alarm_freq; +}; + +static inline u32 rtc_readl(struct ftm_rtc *dev, u32 reg) +{ + if (dev->big_endian) + return ioread32be(dev->base + reg); + else + return ioread32(dev->base + reg); +} + +static inline void rtc_writel(struct ftm_rtc *dev, u32 reg, u32 val) +{ + if (dev->big_endian) + iowrite32be(val, dev->base + reg); + else + iowrite32(val, dev->base + reg); +} + +static inline void ftm_counter_enable(struct ftm_rtc *rtc) +{ + u32 val; + + /* select and enable counter clock source */ + val = rtc_readl(rtc, FTM_SC); + val &= ~(FTM_SC_PS_MASK | FTM_SC_CLK_MASK); + val |= (FTM_SC_PS_MASK | FTM_SC_CLK(FTM_SC_CLKS_FIXED_FREQ)); + rtc_writel(rtc, FTM_SC, val); +} + +static inline void ftm_counter_disable(struct ftm_rtc *rtc) +{ + u32 val; + + /* disable counter clock source */ + val = rtc_readl(rtc, FTM_SC); + val &= ~(FTM_SC_PS_MASK | FTM_SC_CLK_MASK); + rtc_writel(rtc, FTM_SC, val); +} + +static inline void ftm_irq_acknowledge(struct ftm_rtc *rtc) +{ + unsigned int timeout = 100; + + /* + *Fix errata A-007728 for flextimer + * If the FTM counter reaches the FTM_MOD value between + * the reading of the TOF bit and the writing of 0 to + * the TOF bit, the process of clearing the TOF bit + * does not work as expected when FTMx_CONF[NUMTOF] != 0 + * and the current TOF count is less than FTMx_CONF[NUMTOF]. + * If the above condition is met, the TOF bit remains set. + * If the TOF interrupt is enabled (FTMx_SC[TOIE] = 1),the + * TOF interrupt also remains asserted. + * + * Above is the errata discription + * + * In one word: software clearing TOF bit not works when + * FTMx_CONF[NUMTOF] was seted as nonzero and FTM counter + * reaches the FTM_MOD value. + * + * The workaround is clearing TOF bit until it works + * (FTM counter doesn't always reache the FTM_MOD anyway), + * which may cost some cycles. + */ + while ((FTM_SC_TOF & rtc_readl(rtc, FTM_SC)) && timeout--) + rtc_writel(rtc, FTM_SC, rtc_readl(rtc, FTM_SC) & (~FTM_SC_TOF)); +} + +static inline void ftm_irq_enable(struct ftm_rtc *rtc) +{ + u32 val; + + val = rtc_readl(rtc, FTM_SC); + val |= FTM_SC_TOIE; + rtc_writel(rtc, FTM_SC, val); +} + +static inline void ftm_irq_disable(struct ftm_rtc *rtc) +{ + u32 val; + + val = rtc_readl(rtc, FTM_SC); + val &= ~FTM_SC_TOIE; + rtc_writel(rtc, FTM_SC, val); +} + +static inline void ftm_reset_counter(struct ftm_rtc *rtc) +{ + /* + * The CNT register contains the FTM counter value. + * Reset clears the CNT register. Writing any value to COUNT + * updates the counter with its initial value, CNTIN. + */ + rtc_writel(rtc, FTM_CNT, 0x00); +} + +static void ftm_clean_alarm(struct ftm_rtc *rtc) +{ + ftm_counter_disable(rtc); + + rtc_writel(rtc, FTM_CNTIN, 0x00); + rtc_writel(rtc, FTM_MOD, ~0U); + + ftm_reset_counter(rtc); +} + +static irqreturn_t ftm_rtc_alarm_interrupt(int irq, void *dev) +{ + struct ftm_rtc *rtc = dev; + + ftm_irq_acknowledge(rtc); + ftm_irq_disable(rtc); + ftm_clean_alarm(rtc); + + return IRQ_HANDLED; +} + +static int ftm_rtc_alarm_irq_enable(struct device *dev, + unsigned int enabled) +{ + struct ftm_rtc *rtc = dev_get_drvdata(dev); + + if (enabled) + ftm_irq_enable(rtc); + else + ftm_irq_disable(rtc); + + return 0; +} + +/* + * Note: + * The function is not really getting time from the RTC + * since FlexTimer is not a RTC device, but we need to + * get time to setup alarm, so we are using system time + * for now. + */ +static int ftm_rtc_read_time(struct device *dev, struct rtc_time *tm) +{ + struct timespec64 ts64; + unsigned long local_time; + + ktime_get_real_ts64(&ts64); + local_time = (unsigned long)(ts64.tv_sec - (sys_tz.tz_minuteswest * 60)); + + rtc_time_to_tm(local_time, tm); + + return 0; +} + +static int ftm_rtc_read_alarm(struct device *dev, struct rtc_wkalrm *alm) +{ + return 0; +} + +/* + * 1. Select fixed frequency clock (32KHz) as clock source; + * 2. Select 128 (2^7) as divider factor; + * So clock is 250 Hz (32KHz/128). + * + * 3. FlexTimer's CNT register is a 32bit register, + * but the register's 16 bit as counter value,it's other 16 bit + * is reserved.So minimum counter value is 0x0,maximum counter + * value is 0xffff. + * So max alarm value is 262 (65536 / 250) seconds + */ +static int ftm_rtc_set_alarm(struct device *dev, struct rtc_wkalrm *alm) +{ + struct rtc_time tm; + unsigned long now, alm_time, cycle; + struct ftm_rtc *rtc = dev_get_drvdata(dev); + + ftm_rtc_read_time(dev, &tm); + rtc_tm_to_time(&tm, &now); + rtc_tm_to_time(&alm->time, &alm_time); + + ftm_clean_alarm(rtc); + cycle = (alm_time - now) * rtc->alarm_freq; + if (cycle > MAX_COUNT_VAL) { + pr_err("Out of alarm range {0~262} seconds.\n"); + return -EINVAL; + } + + ftm_irq_disable(rtc); + + /* + * The counter increments until the value of MOD is reached, + * at which point the counter is reloaded with the value of CNTIN. + * The TOF (the overflow flag) bit is set when the FTM counter + * changes from MOD to CNTIN. So we should using the cycle - 1. + */ + rtc_writel(rtc, FTM_MOD, cycle - 1); + + ftm_counter_enable(rtc); + ftm_irq_enable(rtc); + + return 0; + +} + +static const struct rtc_class_ops ftm_rtc_ops = { + .read_time = ftm_rtc_read_time, + .read_alarm = ftm_rtc_read_alarm, + .set_alarm = ftm_rtc_set_alarm, + .alarm_irq_enable = ftm_rtc_alarm_irq_enable, +}; + +static int ftm_rtc_probe(struct platform_device *pdev) +{ + struct device_node *np = pdev->dev.of_node; + struct resource *r; + int irq; + int ret; + struct ftm_rtc *rtc; + + rtc = devm_kzalloc(&pdev->dev, sizeof(*rtc), GFP_KERNEL); + if (unlikely(!rtc)) { + pr_err("ftm: cannot alloc memery for rtc\n"); + return -ENOMEM; + } + + platform_set_drvdata(pdev, rtc); + + r = platform_get_resource(pdev, IORESOURCE_MEM, 0); + if (!r) { + pr_err("ftm: cannot get resource for rtc\n"); + return -ENODEV; + } + + rtc->base = devm_ioremap_resource(&pdev->dev, r); + if (IS_ERR(rtc->base)) { + pr_err("ftm: cannot ioremap resource for rtc\n"); + return PTR_ERR(rtc->base); + } + + irq = irq_of_parse_and_map(np, 0); + if (irq <= 0) { + pr_err("ftm: unable to get IRQ from DT, %d\n", irq); + return -EINVAL; + } + + rtc->big_endian = of_property_read_bool(np, "big-endian"); + + ret = devm_request_irq(&pdev->dev, irq, ftm_rtc_alarm_interrupt, + IRQF_NO_SUSPEND, dev_name(&pdev->dev), rtc); + if (ret < 0) { + dev_err(&pdev->dev, "failed to request irq\n"); + return ret; + } + + rtc->alarm_freq = (u32)FIXED_FREQ_CLK / (u32)MAX_FREQ_DIV; + + ftm_clean_alarm(rtc); + + device_init_wakeup(&pdev->dev, true); + rtc->rtc_dev = devm_rtc_device_register(&pdev->dev, "ftm-alarm", + &ftm_rtc_ops, + THIS_MODULE); + if (IS_ERR(rtc->rtc_dev)) { + dev_err(&pdev->dev, "can't register rtc device\n"); + return PTR_ERR(rtc->rtc_dev); + } + return ret; +} + +static const struct of_device_id ftm_rtc_match[] = { + { .compatible = "fsl,ls1012a-ftm-alarm", }, + { .compatible = "fsl,ls1021a-ftm-alarm", }, + { .compatible = "fsl,ls1043a-ftm-alarm", }, + { .compatible = "fsl,ls1046a-ftm-alarm", }, + { .compatible = "fsl,ls1088a-ftm-alarm", }, + { .compatible = "fsl,ls208xa-ftm-alarm", }, + { .compatible = "fsl,ls1028a-ftm-alarm", }, + { }, +}; + +static struct platform_driver ftm_rtc_driver = { + .probe = ftm_rtc_probe, + .driver = { + .name = "ftm-alarm", + .of_match_table = ftm_rtc_match, + }, +}; + +static int __init ftm_alarm_init(void) +{ + return platform_driver_register(&ftm_rtc_driver); +} + +/* + * Ensure that the driver is initialized after + * any real rtc driver + * - The flextimer is not a real rtc device, + * it don't have time and date registers of rtc. + * - The flextimer rtc alarm driver gets time from wall time, + * but the wall time is not ready.so the time from the driver is wrong. + * - If system regist it before any other real rtc device,it will + * be emulated as rtc0,date command will read wrong time for user. + */ +device_initcall_sync(ftm_alarm_init); + +MODULE_DESCRIPTION("NXP/Freescale FlexTimer alarm driver"); +MODULE_AUTHOR("Biwen Li "); +MODULE_LICENSE("GPL"); From patchwork Thu Jul 11 14:43:25 2019 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Biwen Li X-Patchwork-Id: 1130832 Return-Path: X-Original-To: incoming@patchwork.ozlabs.org Delivered-To: patchwork-incoming@bilbo.ozlabs.org Authentication-Results: ozlabs.org; spf=none (mailfrom) smtp.mailfrom=vger.kernel.org (client-ip=209.132.180.67; helo=vger.kernel.org; envelope-from=linux-rtc-owner@vger.kernel.org; receiver=) Authentication-Results: ozlabs.org; dmarc=fail (p=none dis=none) header.from=nxp.com Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by ozlabs.org (Postfix) with ESMTP id 45kzYs3H2Fz9s4Y for ; Fri, 12 Jul 2019 00:52:49 +1000 (AEST) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1728638AbfGKOwo (ORCPT ); Thu, 11 Jul 2019 10:52:44 -0400 Received: from inva021.nxp.com ([92.121.34.21]:50930 "EHLO inva021.nxp.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726213AbfGKOwo (ORCPT ); Thu, 11 Jul 2019 10:52:44 -0400 Received: from inva021.nxp.com (localhost [127.0.0.1]) by inva021.eu-rdc02.nxp.com (Postfix) with ESMTP id 15AA3200949; Thu, 11 Jul 2019 16:52:42 +0200 (CEST) Received: from invc005.ap-rdc01.nxp.com (invc005.ap-rdc01.nxp.com [165.114.16.14]) by inva021.eu-rdc02.nxp.com (Postfix) with ESMTP id CDA812001EC; Thu, 11 Jul 2019 16:52:35 +0200 (CEST) Received: from titan.ap.freescale.net (TITAN.ap.freescale.net [10.192.208.233]) by invc005.ap-rdc01.nxp.com (Postfix) with ESMTP id 04CDD402C1; Thu, 11 Jul 2019 22:52:27 +0800 (SGT) From: Biwen Li To: a.zummo@towertech.it, alexandre.belloni@bootlin.com, leoyang.li@nxp.com, robh+dt@kernel.org Cc: linux-rtc@vger.kernel.org, linux-kernel@vger.kernel.org, xiaobo.xie@nxp.com, jiafei.pan@nxp.com, ran.wang_1@nxp.com, mark.rutland@arm.com, devicetree@vger.kernel.org, Biwen Li Subject: [v3 2/2] Documentation: dt: binding: rtc: add binding for ftm alarm driver Date: Thu, 11 Jul 2019 22:43:25 +0800 Message-Id: <20190711144325.10963-1-biwen.li@nxp.com> X-Mailer: git-send-email 2.9.5 X-Virus-Scanned: ClamAV using ClamSMTP Sender: linux-rtc-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-rtc@vger.kernel.org The patch adds binding for ftm alarm driver Signed-off-by: Biwen Li --- Change in v3: - remove reg-names property - correct cells number Change in v2: - replace ls1043a with ls1088a as example - add rcpm node and fsl,rcpm-wakeup property .../devicetree/bindings/rtc/rtc-fsl-ftm-alarm.txt | 38 ++++++++++++++++++++++ 1 file changed, 38 insertions(+) create mode 100644 Documentation/devicetree/bindings/rtc/rtc-fsl-ftm-alarm.txt diff --git a/Documentation/devicetree/bindings/rtc/rtc-fsl-ftm-alarm.txt b/Documentation/devicetree/bindings/rtc/rtc-fsl-ftm-alarm.txt new file mode 100644 index 0000000..e4eea18 --- /dev/null +++ b/Documentation/devicetree/bindings/rtc/rtc-fsl-ftm-alarm.txt @@ -0,0 +1,38 @@ +Freescale FlexTimer Module (FTM) Alarm + +Note: The driver need work with RCPM driver to wake up system in sleep. + +Required properties: +- compatible : Should be "fsl,-ftm-alarm", the + supported chips include + "fsl,ls1012a-ftm-alarm" + "fsl,ls1021a-ftm-alarm" + "fsl,ls1028a-ftm-alarm" + "fsl,ls1043a-ftm-alarm" + "fsl,ls1046a-ftm-alarm" + "fsl,ls1088a-ftm-alarm" + "fsl,ls208xa-ftm-alarm" +- reg : Specifies base physical address and size of the register sets for the + FlexTimer Module and base physical address of IP Powerdown Exception Control + Register. +- interrupts : Should be the FlexTimer Module interrupt. +- fsl,rcpm-wakeup property and rcpm node : Please refer + Documentation/devicetree/bindings/soc/fsl/rcpm.txt + +Optional properties: +- big-endian: If the host controller is big-endian mode, specify this property. + The default endian mode is little-endian. + +Example: +rcpm: rcpm@1e34040 { + compatible = "fsl,ls1088a-rcpm", "fsl,qoriq-rcpm-2.1+"; + reg = <0x0 0x1e34040 0x0 0x18>; + fsl,#rcpm-wakeup-cells = <6>; +} + +ftm_alarm0: timer@2800000 { + compatible = "fsl,ls1088a-ftm-alarm"; + reg = <0x0 0x2800000 0x0 0x10000>; + fsl,rcpm-wakeup = <&rcpm 0x0 0x0 0x0 0x0 0x4000 0x0>; + interrupts = <0 44 4>; +}