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Commit 063adc75 authored by Paul Mundt's avatar Paul Mundt
Browse files

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: default avatarPaul Mundt <lethal@linux-sh.org>
parent 3ee8da87

drivers/rtc/Kconfig

+1 −1
Original line number Diff line number Diff line
@@ -573,7 +573,7 @@ config RTC_DRV_SA1100 


config RTC_DRV_SH

	tristate "SuperH On-Chip RTC"

	depends on RTC_CLASS && SUPERH

	depends on RTC_CLASS && SUPERH && HAVE_CLK

	help

	  Say Y here to enable support for the on-chip RTC found in

	  most SuperH processors.

drivers/rtc/rtc-sh.c

+49 −18
Original line number Diff line number Diff line 
/*

 * SuperH On-Chip RTC Support

 *

 * Copyright (C) 2006, 2007, 2008  Paul Mundt

 * Copyright (C) 2006 - 2009  Paul Mundt

 * Copyright (C) 2006  Jamie Lenehan

 * Copyright (C) 2008  Angelo Castello

 *
@@ -25,10 +25,11 @@ 
#include <linux/spinlock.h>

#include <linux/io.h>

#include <linux/log2.h>

#include <linux/clk.h>

#include <asm/rtc.h>



#define DRV_NAME	"sh-rtc"

#define DRV_VERSION	"0.2.1"

#define DRV_VERSION	"0.2.2"



#define RTC_REG(r)	((r) * rtc_reg_size)
@@ -93,9 +94,10 @@ struct sh_rtc { 
	int			alarm_irq;

	int			periodic_irq;

	int			carry_irq;

	struct clk		*clk;

	struct rtc_device	*rtc_dev;

	spinlock_t		lock;

	unsigned long capabilities;	/* See asm-sh/rtc.h for cap bits */

	unsigned long		capabilities;	/* See asm/rtc.h for cap bits */

	unsigned short		periodic_freq;

};
@@ -294,10 +296,10 @@ static inline void sh_rtc_setaie(struct device *dev, unsigned int enable) 


	tmp = readb(rtc->regbase + RCR1);



	if (!enable)

		tmp &= ~RCR1_AIE;

	else

	if (enable)

		tmp |= RCR1_AIE;

	else

		tmp &= ~RCR1_AIE;



	writeb(tmp, rtc->regbase + RCR1);
@@ -618,6 +620,7 @@ static int sh_rtc_irq_set_freq(struct device *dev, int freq) 
{

	if (!is_power_of_2(freq))

		return -EINVAL;



	return sh_rtc_ioctl(dev, RTC_IRQP_SET, freq);

}
@@ -637,7 +640,8 @@ static int __devinit sh_rtc_probe(struct platform_device *pdev) 
	struct sh_rtc *rtc;

	struct resource *res;

	struct rtc_time r;

	int ret;

	char clk_name[6];

	int clk_id, ret;



	rtc = kzalloc(sizeof(struct sh_rtc), GFP_KERNEL);

	if (unlikely(!rtc))
@@ -652,6 +656,7 @@ static int __devinit sh_rtc_probe(struct platform_device *pdev) 
		dev_err(&pdev->dev, "No IRQ resource\n");

		goto err_badres;

	}



	rtc->periodic_irq = ret;

	rtc->carry_irq = platform_get_irq(pdev, 1);

	rtc->alarm_irq = platform_get_irq(pdev, 2);
@@ -663,7 +668,7 @@ static int __devinit sh_rtc_probe(struct platform_device *pdev) 
		goto err_badres;

	}



	rtc->regsize = res->end - res->start + 1;

	rtc->regsize = resource_size(res);



	rtc->res = request_mem_region(res->start, rtc->regsize, pdev->name);

	if (unlikely(!rtc->res)) {
@@ -677,6 +682,26 @@ static int __devinit sh_rtc_probe(struct platform_device *pdev) 
		goto err_badmap;

	}



	clk_id = pdev->id;

	/* With a single device, the clock id is still "rtc0" */

	if (clk_id < 0)

		clk_id = 0;



	snprintf(clk_name, sizeof(clk_name), "rtc%d", clk_id);



	rtc->clk = clk_get(&pdev->dev, clk_name);

	if (IS_ERR(rtc->clk)) {

		/*

		 * No error handling for rtc->clk intentionally, not all

		 * platforms will have a unique clock for the RTC, and

		 * the clk API can handle the struct clk pointer being

		 * NULL.

		 */

		rtc->clk = NULL;

	}



	clk_enable(rtc->clk);



	rtc->rtc_dev = rtc_device_register("sh", &pdev->dev,

					   &sh_rtc_ops, THIS_MODULE);

	if (IS_ERR(rtc->rtc_dev)) {
@@ -759,6 +784,8 @@ static int __devinit sh_rtc_probe(struct platform_device *pdev) 
	return 0;



err_unmap:

	clk_disable(rtc->clk);

	clk_put(rtc->clk);

	iounmap(rtc->regbase);

err_badmap:

	release_resource(rtc->res);
@@ -780,6 +807,7 @@ static int __devexit sh_rtc_remove(struct platform_device *pdev) 
	sh_rtc_setcie(&pdev->dev, 0);



	free_irq(rtc->periodic_irq, rtc);



	if (rtc->carry_irq > 0) {

		free_irq(rtc->carry_irq, rtc);

		free_irq(rtc->alarm_irq, rtc);
@@ -789,6 +817,9 @@ static int __devexit sh_rtc_remove(struct platform_device *pdev) 


	iounmap(rtc->regbase);



	clk_disable(rtc->clk);

	clk_put(rtc->clk);



	platform_set_drvdata(pdev, NULL);



	kfree(rtc);
@@ -802,11 +833,11 @@ static void sh_rtc_set_irq_wake(struct device *dev, int enabled) 
	struct sh_rtc *rtc = platform_get_drvdata(pdev);



	set_irq_wake(rtc->periodic_irq, enabled);



	if (rtc->carry_irq > 0) {

		set_irq_wake(rtc->carry_irq, enabled);

		set_irq_wake(rtc->alarm_irq, enabled);

	}



}



static int sh_rtc_suspend(struct device *dev)