From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S936487AbaH1JC5 (ORCPT ); Thu, 28 Aug 2014 05:02:57 -0400 Received: from mailout4.samsung.com ([203.254.224.34]:56215 "EHLO mailout4.samsung.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S936471AbaH1JCw (ORCPT ); Thu, 28 Aug 2014 05:02:52 -0400 X-AuditID: cbfee68e-f79536d000000fd1-6a-53fef033b331 From: Chanwoo Choi To: a.zummo@towertech.it Cc: kgene.kim@samsung.com, akpm@linux-foundation.org, kyungmin.park@samsung.com, rtc-linux@googlegroups.com, linux-kernel@vger.kernel.org, linux-samsung-soc@vger.kernel.org, Chanwoo Choi Subject: [PATCHv3 4/5] rtc: s3c: Add support for RTC of Exynos3250 SoC Date: Thu, 28 Aug 2014 18:02:38 +0900 Message-id: <1409216559-22402-5-git-send-email-cw00.choi@samsung.com> X-Mailer: git-send-email 1.8.0 In-reply-to: <1409216559-22402-1-git-send-email-cw00.choi@samsung.com> References: <1409216559-22402-1-git-send-email-cw00.choi@samsung.com> X-Brightmail-Tracker: H4sIAAAAAAAAA+NgFrrLLMWRmVeSWpSXmKPExsWyRsSkWNf4w79gg09NphZLLl5lt5izfg2b xfUvz1ktehdcZbM42/SG3eLyrjlsFjPO72Oy2N/ZwejA4bFn4kk2jxMzfrN49G1Zxegxfd5P Jo/Pm+QCWKO4bFJSczLLUov07RK4Mla94iqYH1/xZ+E71gbGR35djJwcEgImEj+nTWGHsMUk Ltxbz9bFyMUhJLCUUWLC0mPMMEWzHj5iArGFBKYzSrxoY4awm5gk1vXygNhsAloS+1/cYAOx RQQkJJbMucMIYjML3ACq3xYDYgsLuElseToRrIZFQFXi6KetrCA2r4CrxJHVs5kgdslJfNjz COggDg5OoPqHa6sgVrlKfP95ihHkNgmB6ewSzdfesEPMEZD4NvkQC0i9hICsxKYDUCdLShxc cYNlAqPwAkaGVYyiqQXJBcVJ6UVGesWJucWleel6yfm5mxiBoX7637O+HYw3D1gfYhTgYFTi 4XWI+xcsxJpYVlyZe4jRFGjDRGYp0eR8YETllcQbGpsZWZiamBobmVuaKYnzJkj9DBYSSE8s Sc1OTS1ILYovKs1JLT7EyMTBKdXA6FxWsS2Df7+GUGfrSdfvuR3hHA7z1aImPzl4r6fB+lnz QymFFYvOf3Xdpiy3k/XuTq+Ez1uTli0Xupxi/nGj7ZwJar0L7i39svz67z13bnXulntWUpUo zWcZ1VXl+F1g394T30W//ZLUu3u1pNNeTofh38bOXhGL07qf9aTTZv5z29wqvT6zSomlOCPR UIu5qDgRAPnxTGRwAgAA X-Brightmail-Tracker: H4sIAAAAAAAAA+NgFlrOIsWRmVeSWpSXmKPExsVy+t9jQV3jD/+CDd7P0rVYcvEqu8Wc9WvY LK5/ec5q0bvgKpvF2aY37BaXd81hs5hxfh+Txf7ODkYHDo89E0+yeZyY8ZvFo2/LKkaP6fN+ Mnl83iQXwBrVwGiTkZqYklqkkJqXnJ+SmZduq+QdHO8cb2pmYKhraGlhrqSQl5ibaqvk4hOg 65aZA3SMkkJZYk4pUCggsbhYSd8O04TQEDddC5jGCF3fkCC4HiMDNJCwhjFj1SuugvnxFX8W vmNtYHzk18XIySEhYCIx6+EjJghbTOLCvfVsILaQwHRGiRdtzBB2E5PEul4eEJtNQEti/4sb YDUiAhISS+bcYQSxmQVuANVviwGxhQXcJLY8nQhWwyKgKnH001ZWEJtXwFXiyOrZULvkJD7s ecTexcjBwQlU/3BtFcQqV4nvP08xTmDkXcDIsIpRNLUguaA4KT3XUK84Mbe4NC9dLzk/dxMj OJKeSe1gXNlgcYhRgINRiYfXIe5fsBBrYllxZe4hRgkOZiUR3qPHgUK8KYmVValF+fFFpTmp xYcYTYGOmsgsJZqcD4zyvJJ4Q2MTMyNLI3NDCyNjcyVx3gOt1oFCAumJJanZqakFqUUwfUwc nFINjPP3vdpwouB095bFhVov/YysD9fcfrf0fOZq5aI8vxcRR5t8s9f3z1Qx0NLtq/L7/2bt sVeq9fNN0jfyrf7JP/X4bl7pb607GCYsPH5z216j+qQ7Ex6G1u58cD5Nnmt/4dGTubItjI91 RKx/dbIaNV9SM9y4+Wtz29lbn1hcxLj3P1mgKLJvkYASS3FGoqEWc1FxIgCDycqnugIAAA== DLP-Filter: Pass X-MTR: 20000000000000000@CPGS X-CFilter-Loop: Reflected Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org This patch add support for RTC of Exynos3250 SoC. The Exynos3250 needs source clock(32.768KHz) for RTC block. If source clock of RTC is registerd on clock list of common clk framework, Exynos RTC drvier have to control this clock. Clock list for s3c-rtc device: - rtc : CLK_RTC of CLK_GATE_IP_PERIR is gate clock for RTC. - rtc_src : XrtcXTI is 32.768.kHz source clock for RTC. (XRTCXTI: Specifies a clock from 32.768 kHz crystal pad with XRTCXTI and XRTCXTO pins. RTC uses this clock as the source of a real-time clock.) Signed-off-by: Chanwoo Choi Acked-by: Kyungmin Park Cc: Alessandro Zummo Cc: Kukjin Kim Cc: Andrew Morton --- Documentation/devicetree/bindings/rtc/s3c-rtc.txt | 1 + drivers/rtc/rtc-s3c.c | 93 ++++++++++++++++++++++- 2 files changed, 93 insertions(+), 1 deletion(-) diff --git a/Documentation/devicetree/bindings/rtc/s3c-rtc.txt b/Documentation/devicetree/bindings/rtc/s3c-rtc.txt index 06db446..ab757b84 100644 --- a/Documentation/devicetree/bindings/rtc/s3c-rtc.txt +++ b/Documentation/devicetree/bindings/rtc/s3c-rtc.txt @@ -6,6 +6,7 @@ Required properties: * "samsung,s3c2416-rtc" - for controllers compatible with s3c2416 rtc. * "samsung,s3c2443-rtc" - for controllers compatible with s3c2443 rtc. * "samsung,s3c6410-rtc" - for controllers compatible with s3c6410 rtc. + * "samsung,exynos3250-rtc" - for controllers compatible with exynos3250 rtc. - reg: physical base address of the controller and length of memory mapped region. - interrupts: Two interrupt numbers to the cpu should be specified. First diff --git a/drivers/rtc/rtc-s3c.c b/drivers/rtc/rtc-s3c.c index 0d90892..a6b1252 100644 --- a/drivers/rtc/rtc-s3c.c +++ b/drivers/rtc/rtc-s3c.c @@ -38,6 +38,7 @@ struct s3c_rtc { void __iomem *base; struct clk *rtc_clk; + struct clk *rtc_src_clk; bool enabled; struct s3c_rtc_data *data; @@ -54,6 +55,7 @@ struct s3c_rtc { struct s3c_rtc_data { int max_user_freq; + bool needs_src_clk; void (*irq_handler) (struct s3c_rtc *info, int mask); void (*set_freq) (struct s3c_rtc *info, int freq); @@ -73,10 +75,14 @@ static void s3c_rtc_alarm_clk_enable(struct s3c_rtc *info, bool enable) if (enable) { if (!info->enabled) { clk_enable(info->rtc_clk); + if (info->data->needs_src_clk) + clk_enable(info->rtc_src_clk); info->enabled = true; } } else { if (info->enabled) { + if (info->data->needs_src_clk) + clk_disable(info->rtc_src_clk); clk_disable(info->rtc_clk); info->enabled = false; } @@ -114,12 +120,16 @@ static int s3c_rtc_setaie(struct device *dev, unsigned int enabled) dev_dbg(info->dev, "%s: aie=%d\n", __func__, enabled); clk_enable(info->rtc_clk); + if (info->data->needs_src_clk) + clk_enable(info->rtc_src_clk); tmp = readb(info->base + S3C2410_RTCALM) & ~S3C2410_RTCALM_ALMEN; if (enabled) tmp |= S3C2410_RTCALM_ALMEN; writeb(tmp, info->base + S3C2410_RTCALM); + if (info->data->needs_src_clk) + clk_disable(info->rtc_src_clk); clk_disable(info->rtc_clk); s3c_rtc_alarm_clk_enable(info, enabled); @@ -134,12 +144,16 @@ static int s3c_rtc_setfreq(struct s3c_rtc *info, int freq) return -EINVAL; clk_enable(info->rtc_clk); + if (info->data->needs_src_clk) + clk_enable(info->rtc_src_clk); spin_lock_irq(&info->pie_lock); if (info->data->set_freq) info->data->set_freq(info, freq); spin_unlock_irq(&info->pie_lock); + if (info->data->needs_src_clk) + clk_disable(info->rtc_src_clk); clk_disable(info->rtc_clk); return 0; @@ -152,6 +166,9 @@ static int s3c_rtc_gettime(struct device *dev, struct rtc_time *rtc_tm) unsigned int have_retried = 0; clk_enable(info->rtc_clk); + if (info->data->needs_src_clk) + clk_enable(info->rtc_src_clk); + retry_get_time: rtc_tm->tm_min = readb(info->base + S3C2410_RTCMIN); rtc_tm->tm_hour = readb(info->base + S3C2410_RTCHOUR); @@ -185,6 +202,8 @@ static int s3c_rtc_gettime(struct device *dev, struct rtc_time *rtc_tm) rtc_tm->tm_mon -= 1; + if (info->data->needs_src_clk) + clk_disable(info->rtc_src_clk); clk_disable(info->rtc_clk); return rtc_valid_tm(rtc_tm); @@ -207,6 +226,8 @@ static int s3c_rtc_settime(struct device *dev, struct rtc_time *tm) } clk_enable(info->rtc_clk); + if (info->data->needs_src_clk) + clk_enable(info->rtc_src_clk); writeb(bin2bcd(tm->tm_sec), info->base + S3C2410_RTCSEC); writeb(bin2bcd(tm->tm_min), info->base + S3C2410_RTCMIN); @@ -215,6 +236,8 @@ static int s3c_rtc_settime(struct device *dev, struct rtc_time *tm) writeb(bin2bcd(tm->tm_mon + 1), info->base + S3C2410_RTCMON); writeb(bin2bcd(year), info->base + S3C2410_RTCYEAR); + if (info->data->needs_src_clk) + clk_disable(info->rtc_src_clk); clk_disable(info->rtc_clk); return 0; @@ -227,6 +250,9 @@ static int s3c_rtc_getalarm(struct device *dev, struct rtc_wkalrm *alrm) unsigned int alm_en; clk_enable(info->rtc_clk); + if (info->data->needs_src_clk) + clk_enable(info->rtc_src_clk); + alm_tm->tm_sec = readb(info->base + S3C2410_ALMSEC); alm_tm->tm_min = readb(info->base + S3C2410_ALMMIN); alm_tm->tm_hour = readb(info->base + S3C2410_ALMHOUR); @@ -278,7 +304,10 @@ static int s3c_rtc_getalarm(struct device *dev, struct rtc_wkalrm *alrm) else alm_tm->tm_year = -1; + if (info->data->needs_src_clk) + clk_disable(info->rtc_src_clk); clk_disable(info->rtc_clk); + return 0; } @@ -289,6 +318,9 @@ static int s3c_rtc_setalarm(struct device *dev, struct rtc_wkalrm *alrm) unsigned int alrm_en; clk_enable(info->rtc_clk); + if (info->data->needs_src_clk) + clk_enable(info->rtc_src_clk); + dev_dbg(dev, "s3c_rtc_setalarm: %d, %04d.%02d.%02d %02d:%02d:%02d\n", alrm->enabled, 1900 + tm->tm_year, tm->tm_mon + 1, tm->tm_mday, @@ -318,6 +350,8 @@ static int s3c_rtc_setalarm(struct device *dev, struct rtc_wkalrm *alrm) s3c_rtc_setaie(dev, alrm->enabled); + if (info->data->needs_src_clk) + clk_disable(info->rtc_src_clk); clk_disable(info->rtc_clk); return 0; @@ -328,10 +362,14 @@ static int s3c_rtc_proc(struct device *dev, struct seq_file *seq) struct s3c_rtc *info = dev_get_drvdata(dev); clk_enable(info->rtc_clk); + if (info->data->needs_src_clk) + clk_enable(info->rtc_src_clk); if (info->data->enable_tick) info->data->enable_tick(info, seq); + if (info->data->needs_src_clk) + clk_disable(info->rtc_src_clk); clk_disable(info->rtc_clk); return 0; @@ -351,6 +389,8 @@ static void s3c24xx_rtc_enable(struct s3c_rtc *info) unsigned int con, tmp; clk_enable(info->rtc_clk); + if (info->data->needs_src_clk) + clk_enable(info->rtc_src_clk); con = readw(info->base + S3C2410_RTCCON); /* re-enable the device, and check it is ok */ @@ -378,6 +418,8 @@ static void s3c24xx_rtc_enable(struct s3c_rtc *info) info->base + S3C2410_RTCCON); } + if (info->data->needs_src_clk) + clk_disable(info->rtc_src_clk); clk_disable(info->rtc_clk); } @@ -386,6 +428,8 @@ static void s3c24xx_rtc_disable(struct s3c_rtc *info) unsigned int con; clk_enable(info->rtc_clk); + if (info->data->needs_src_clk) + clk_enable(info->rtc_src_clk); con = readw(info->base + S3C2410_RTCCON); con &= ~S3C2410_RTCCON_RTCEN; @@ -395,6 +439,8 @@ static void s3c24xx_rtc_disable(struct s3c_rtc *info) con &= ~S3C2410_TICNT_ENABLE; writeb(con, info->base + S3C2410_TICNT); + if (info->data->needs_src_clk) + clk_disable(info->rtc_src_clk); clk_disable(info->rtc_clk); } @@ -403,12 +449,16 @@ static void s3c6410_rtc_disable(struct s3c_rtc *info) unsigned int con; clk_enable(info->rtc_clk); + if (info->data->needs_src_clk) + clk_enable(info->rtc_src_clk); con = readw(info->base + S3C2410_RTCCON); con &= ~S3C64XX_RTCCON_TICEN; con &= ~S3C2410_RTCCON_RTCEN; writew(con, info->base + S3C2410_RTCCON); + if (info->data->needs_src_clk) + clk_disable(info->rtc_src_clk); clk_disable(info->rtc_clk); } @@ -480,11 +530,19 @@ static int s3c_rtc_probe(struct platform_device *pdev) info->rtc_clk = devm_clk_get(&pdev->dev, "rtc"); if (IS_ERR(info->rtc_clk)) { - dev_err(&pdev->dev, "failed to find rtc clock source\n"); + dev_err(&pdev->dev, "failed to find rtc clock\n"); return PTR_ERR(info->rtc_clk); } clk_prepare_enable(info->rtc_clk); + info->rtc_src_clk = devm_clk_get(&pdev->dev, "rtc_src"); + if (IS_ERR(info->rtc_src_clk)) { + dev_err(&pdev->dev, "failed to find rtc source clock\n"); + return PTR_ERR(info->rtc_src_clk); + } + clk_prepare_enable(info->rtc_src_clk); + + /* check to see if everything is setup correctly */ if (info->data->enable) info->data->enable(info); @@ -538,6 +596,8 @@ static int s3c_rtc_probe(struct platform_device *pdev) s3c_rtc_setfreq(info, 1); + if (info->data->needs_src_clk) + clk_disable(info->rtc_src_clk); clk_disable(info->rtc_clk); return 0; @@ -557,6 +617,8 @@ static int s3c_rtc_suspend(struct device *dev) struct s3c_rtc *info = dev_get_drvdata(dev); clk_enable(info->rtc_clk); + if (info->data->needs_src_clk) + clk_enable(info->rtc_src_clk); /* save TICNT for anyone using periodic interrupts */ if (info->data->save_tick_cnt) @@ -572,6 +634,8 @@ static int s3c_rtc_suspend(struct device *dev) dev_err(dev, "enable_irq_wake failed\n"); } + if (info->data->needs_src_clk) + clk_disable(info->rtc_src_clk); clk_disable(info->rtc_clk); return 0; @@ -582,6 +646,8 @@ static int s3c_rtc_resume(struct device *dev) struct s3c_rtc *info = dev_get_drvdata(dev); clk_enable(info->rtc_clk); + if (info->data->needs_src_clk) + clk_enable(info->rtc_src_clk); if (info->data->enable) info->data->enable(info); @@ -594,6 +660,8 @@ static int s3c_rtc_resume(struct device *dev) info->wake_en = false; } + if (info->data->needs_src_clk) + clk_disable(info->rtc_src_clk); clk_disable(info->rtc_clk); return 0; @@ -604,7 +672,11 @@ static SIMPLE_DEV_PM_OPS(s3c_rtc_pm_ops, s3c_rtc_suspend, s3c_rtc_resume); static void s3c24xx_rtc_irq(struct s3c_rtc *info, int mask) { clk_enable(info->rtc_clk); + if (info->data->needs_src_clk) + clk_enable(info->rtc_src_clk); rtc_update_irq(info->rtc, 1, RTC_AF | RTC_IRQF); + if (info->data->needs_src_clk) + clk_disable(info->rtc_src_clk); clk_disable(info->rtc_clk); s3c_rtc_alarm_clk_enable(info, false); @@ -613,8 +685,12 @@ static void s3c24xx_rtc_irq(struct s3c_rtc *info, int mask) static void s3c6410_rtc_irq(struct s3c_rtc *info, int mask) { clk_enable(info->rtc_clk); + if (info->data->needs_src_clk) + clk_enable(info->rtc_src_clk); rtc_update_irq(info->rtc, 1, RTC_AF | RTC_IRQF); writeb(mask, info->base + S3C2410_INTP); + if (info->data->needs_src_clk) + clk_disable(info->rtc_src_clk); clk_disable(info->rtc_clk); s3c_rtc_alarm_clk_enable(info, false); @@ -780,6 +856,18 @@ static struct s3c_rtc_data const s3c6410_rtc_data = { .disable = s3c6410_rtc_disable, }; +static struct s3c_rtc_data const exynos3250_rtc_data = { + .max_user_freq = 32768, + .needs_src_clk = true, + .irq_handler = s3c6410_rtc_irq, + .set_freq = s3c6410_rtc_setfreq, + .enable_tick = s3c6410_rtc_enable_tick, + .save_tick_cnt = s3c6410_rtc_save_tick_cnt, + .restore_tick_cnt = s3c6410_rtc_restore_tick_cnt, + .enable = s3c24xx_rtc_enable, + .disable = s3c6410_rtc_disable, +}; + static const struct of_device_id s3c_rtc_dt_match[] = { { .compatible = "samsung,s3c2410-rtc", @@ -793,6 +881,9 @@ static const struct of_device_id s3c_rtc_dt_match[] = { }, { .compatible = "samsung,s3c6410-rtc", .data = (void *)&s3c6410_rtc_data, + }, { + .compatible = "samsung,exynos3250-rtc", + .data = (void *)&exynos3250_rtc_data, }, { /* sentinel */ }, }; -- 1.8.0