Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S933702AbbLORpp (ORCPT ); Tue, 15 Dec 2015 12:45:45 -0500 Received: from mail-lb0-f196.google.com ([209.85.217.196]:32915 "EHLO mail-lb0-f196.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S933668AbbLORpg (ORCPT ); Tue, 15 Dec 2015 12:45:36 -0500 From: Sergei Ianovich To: linux-kernel@vger.kernel.org Cc: Sergei Ianovich , Alexandre Belloni , Rob Herring , Pawel Moll , Mark Rutland , Ian Campbell , Kumar Gala , Alessandro Zummo , devicetree@vger.kernel.org (open list:OPEN FIRMWARE AND FLATTENED DEVICE TREE BINDINGS), rtc-linux@googlegroups.com (open list:REAL TIME CLOCK (RTC) SUBSYSTEM) Subject: [PATCH v5] rtc: support DS1302 RTC on ICP DAS LP-8x4x Date: Tue, 15 Dec 2015 20:45:23 +0300 Message-Id: <1450201525-9137-1-git-send-email-ynvich@gmail.com> X-Mailer: git-send-email 2.6.2 In-Reply-To: <397668667-27328-3-git-send-email-ynvich@gmail.com> References: <397668667-27328-3-git-send-email-ynvich@gmail.com> Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 4791 Lines: 197 Signed-off-by: Sergei Ianovich CC: Alexandre Belloni --- v4..v5 * drop THIS_MODULE from struct platform driver * use "dallas" for vendor name per vendor-prefixes.txt v3..v4 * move DTS bindings to a different patch v2..v3 * use usleep_range instead of custom nsleep * number change (07/16 -> 09/21) v0..v2 * use device tree * use devm helpers where possible .../devicetree/bindings/rtc/rtc-ds1302.txt | 14 +++ drivers/rtc/Kconfig | 2 +- drivers/rtc/rtc-ds1302.c | 100 ++++++++++++++++++++- 3 files changed, 113 insertions(+), 3 deletions(-) create mode 100644 Documentation/devicetree/bindings/rtc/rtc-ds1302.txt diff --git a/Documentation/devicetree/bindings/rtc/rtc-ds1302.txt b/Documentation/devicetree/bindings/rtc/rtc-ds1302.txt new file mode 100644 index 0000000..810613b --- /dev/null +++ b/Documentation/devicetree/bindings/rtc/rtc-ds1302.txt @@ -0,0 +1,14 @@ +* Dallas Semiconductor DS-1302 RTC + +Simple device which could be used to store date/time between reboots. + +Required properties: +- compatible : Should be "dallas,rtc-ds1302" +- reg : Should be address and size of IO memory region + +Examples: + +rtc@40900000 { + compatible = "dallas,rtc-ds1302"; + reg = <0x1700901c 0x1>; +}; diff --git a/drivers/rtc/Kconfig b/drivers/rtc/Kconfig index 2a52424..cf36483 100644 --- a/drivers/rtc/Kconfig +++ b/drivers/rtc/Kconfig @@ -803,7 +803,7 @@ config RTC_DRV_DS1286 config RTC_DRV_DS1302 tristate "Dallas DS1302" - depends on SH_SECUREEDGE5410 + depends on SH_SECUREEDGE5410 || (ARCH_PXA && HIGH_RES_TIMERS) help If you say yes here you get support for the Dallas DS1302 RTC chips. diff --git a/drivers/rtc/rtc-ds1302.c b/drivers/rtc/rtc-ds1302.c index 6bef7a5..bd68214 100644 --- a/drivers/rtc/rtc-ds1302.c +++ b/drivers/rtc/rtc-ds1302.c @@ -50,7 +50,7 @@ #define ds1302_set_tx() #define ds1302_set_rx() -static inline int ds1302_hw_init(void) +static inline int ds1302_hw_init(struct platform_device *pdev) { return 0; } @@ -86,6 +86,101 @@ static inline int ds1302_rxbit(void) return !!(get_dp() & RTC_IODATA); } +#elif defined(CONFIG_ARCH_PXA) && defined(CONFIG_HIGH_RES_TIMERS) + +#include +#include + +#define RTC_CE 0x01 +#define RTC_CLK 0x02 +#define RTC_nWE 0x04 +#define RTC_IODATA 0x08 + +static unsigned long ds1302_state; + +static void *mem; + +static inline int ds1302_hw_init(struct platform_device *pdev) +{ + struct resource *r; + + r = platform_get_resource(pdev, IORESOURCE_MEM, 0); + if (!r) + return -ENODEV; + + mem = devm_ioremap_resource(&pdev->dev, r); + if (!mem) + return -EFAULT; + + return 0; +} + +static inline void ds1302_reset(void) +{ + ds1302_state = 0; + iowrite8(ds1302_state, mem); + usleep_range(4, 5); +} + +static inline void ds1302_clock(void) +{ + usleep_range(1, 2); + ds1302_state |= RTC_CLK; + iowrite8(ds1302_state, mem); + usleep_range(1, 2); + ds1302_state &= ~RTC_CLK; + iowrite8(ds1302_state, mem); +} + +static inline void ds1302_start(void) +{ + ds1302_state &= ~RTC_CLK; + ds1302_state |= RTC_CE; + iowrite8(ds1302_state, mem); + usleep_range(3, 4); +} + +static inline void ds1302_stop(void) +{ + ds1302_state &= ~RTC_CE; + iowrite8(ds1302_state, mem); +} + +static inline void ds1302_set_tx(void) +{ + ds1302_state &= ~RTC_nWE; + iowrite8(ds1302_state, mem); +} + +static inline void ds1302_set_rx(void) +{ + ds1302_state |= RTC_nWE; + iowrite8(ds1302_state, mem); +} + +static inline void ds1302_txbit(int bit) +{ + if (bit) + ds1302_state |= RTC_IODATA; + else + ds1302_state &= ~RTC_IODATA; + iowrite8(ds1302_state, mem); +} + +static inline int ds1302_rxbit(void) +{ + return ioread8(mem) & 0x1; +} + +#ifdef CONFIG_OF +static const struct of_device_id ds1302_dt_ids[] = { + { .compatible = "dallas,rtc-ds1302" }, + { } +}; + +MODULE_DEVICE_TABLE(of, ds1302_dt_ids); +#endif + #else #error "Add support for your platform" #endif @@ -216,7 +311,7 @@ static int __init ds1302_rtc_probe(struct platform_device *pdev) { struct rtc_device *rtc; - if (ds1302_hw_init()) { + if (ds1302_hw_init(pdev)) { dev_err(&pdev->dev, "Failed to init communication channel"); return -EINVAL; } @@ -244,6 +339,7 @@ static int __init ds1302_rtc_probe(struct platform_device *pdev) static struct platform_driver ds1302_platform_driver = { .driver = { .name = DRV_NAME, + .of_match_table = of_match_ptr(ds1302_dt_ids), }, }; -- 2.6.2 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/