rtc: rtc-sh: clock framework support.
This adds clock framework support to the rtc-sh driver. With this in place, platforms can default to leaving the clock disabled rather than placing it in the always enabled state. Signed-off-by: Paul Mundt <lethal@linux-sh.org>
This commit is contained in:
Paul Mundt
parent
3ee8da87ba
commit
063adc7502
@ -573,7 +573,7 @@ config RTC_DRV_SA1100
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config RTC_DRV_SH
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tristate "SuperH On-Chip RTC"
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depends on RTC_CLASS && SUPERH
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depends on RTC_CLASS && SUPERH && HAVE_CLK
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help
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Say Y here to enable support for the on-chip RTC found in
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most SuperH processors.
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@ -1,7 +1,7 @@
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/*
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* SuperH On-Chip RTC Support
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*
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* Copyright (C) 2006, 2007, 2008 Paul Mundt
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* Copyright (C) 2006 - 2009 Paul Mundt
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* Copyright (C) 2006 Jamie Lenehan
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* Copyright (C) 2008 Angelo Castello
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*
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@ -25,10 +25,11 @@
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#include <linux/spinlock.h>
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#include <linux/io.h>
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#include <linux/log2.h>
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#include <linux/clk.h>
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#include <asm/rtc.h>
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#define DRV_NAME "sh-rtc"
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#define DRV_VERSION "0.2.1"
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#define DRV_VERSION "0.2.2"
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#define RTC_REG(r) ((r) * rtc_reg_size)
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@ -87,16 +88,17 @@
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#define RCR2_START 0x01 /* Start bit */
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struct sh_rtc {
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void __iomem *regbase;
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unsigned long regsize;
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struct resource *res;
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int alarm_irq;
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int periodic_irq;
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int carry_irq;
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struct rtc_device *rtc_dev;
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spinlock_t lock;
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unsigned long capabilities; /* See asm-sh/rtc.h for cap bits */
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unsigned short periodic_freq;
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void __iomem *regbase;
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unsigned long regsize;
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struct resource *res;
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int alarm_irq;
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int periodic_irq;
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int carry_irq;
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struct clk *clk;
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struct rtc_device *rtc_dev;
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spinlock_t lock;
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unsigned long capabilities; /* See asm/rtc.h for cap bits */
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unsigned short periodic_freq;
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};
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static int __sh_rtc_interrupt(struct sh_rtc *rtc)
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@ -294,10 +296,10 @@ static inline void sh_rtc_setaie(struct device *dev, unsigned int enable)
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tmp = readb(rtc->regbase + RCR1);
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if (!enable)
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tmp &= ~RCR1_AIE;
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else
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if (enable)
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tmp |= RCR1_AIE;
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else
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tmp &= ~RCR1_AIE;
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writeb(tmp, rtc->regbase + RCR1);
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@ -618,6 +620,7 @@ static int sh_rtc_irq_set_freq(struct device *dev, int freq)
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{
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if (!is_power_of_2(freq))
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return -EINVAL;
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return sh_rtc_ioctl(dev, RTC_IRQP_SET, freq);
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}
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@ -637,7 +640,8 @@ static int __devinit sh_rtc_probe(struct platform_device *pdev)
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struct sh_rtc *rtc;
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struct resource *res;
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struct rtc_time r;
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int ret;
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char clk_name[6];
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int clk_id, ret;
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rtc = kzalloc(sizeof(struct sh_rtc), GFP_KERNEL);
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if (unlikely(!rtc))
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@ -652,6 +656,7 @@ static int __devinit sh_rtc_probe(struct platform_device *pdev)
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dev_err(&pdev->dev, "No IRQ resource\n");
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goto err_badres;
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}
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rtc->periodic_irq = ret;
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rtc->carry_irq = platform_get_irq(pdev, 1);
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rtc->alarm_irq = platform_get_irq(pdev, 2);
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@ -663,7 +668,7 @@ static int __devinit sh_rtc_probe(struct platform_device *pdev)
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goto err_badres;
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}
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rtc->regsize = res->end - res->start + 1;
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rtc->regsize = resource_size(res);
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rtc->res = request_mem_region(res->start, rtc->regsize, pdev->name);
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if (unlikely(!rtc->res)) {
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@ -677,6 +682,26 @@ static int __devinit sh_rtc_probe(struct platform_device *pdev)
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goto err_badmap;
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}
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clk_id = pdev->id;
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/* With a single device, the clock id is still "rtc0" */
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if (clk_id < 0)
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clk_id = 0;
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snprintf(clk_name, sizeof(clk_name), "rtc%d", clk_id);
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rtc->clk = clk_get(&pdev->dev, clk_name);
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if (IS_ERR(rtc->clk)) {
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/*
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* No error handling for rtc->clk intentionally, not all
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* platforms will have a unique clock for the RTC, and
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* the clk API can handle the struct clk pointer being
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* NULL.
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*/
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rtc->clk = NULL;
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}
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clk_enable(rtc->clk);
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rtc->rtc_dev = rtc_device_register("sh", &pdev->dev,
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&sh_rtc_ops, THIS_MODULE);
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if (IS_ERR(rtc->rtc_dev)) {
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@ -759,6 +784,8 @@ static int __devinit sh_rtc_probe(struct platform_device *pdev)
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return 0;
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err_unmap:
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clk_disable(rtc->clk);
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clk_put(rtc->clk);
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iounmap(rtc->regbase);
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err_badmap:
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release_resource(rtc->res);
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@ -780,6 +807,7 @@ static int __devexit sh_rtc_remove(struct platform_device *pdev)
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sh_rtc_setcie(&pdev->dev, 0);
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free_irq(rtc->periodic_irq, rtc);
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if (rtc->carry_irq > 0) {
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free_irq(rtc->carry_irq, rtc);
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free_irq(rtc->alarm_irq, rtc);
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@ -789,6 +817,9 @@ static int __devexit sh_rtc_remove(struct platform_device *pdev)
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iounmap(rtc->regbase);
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clk_disable(rtc->clk);
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clk_put(rtc->clk);
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platform_set_drvdata(pdev, NULL);
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kfree(rtc);
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@ -802,11 +833,11 @@ static void sh_rtc_set_irq_wake(struct device *dev, int enabled)
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struct sh_rtc *rtc = platform_get_drvdata(pdev);
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set_irq_wake(rtc->periodic_irq, enabled);
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if (rtc->carry_irq > 0) {
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set_irq_wake(rtc->carry_irq, enabled);
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set_irq_wake(rtc->alarm_irq, enabled);
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}
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}
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static int sh_rtc_suspend(struct device *dev)
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