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Subject[PATCH 8/8] W1: OMAP HDQ1W: use runtime PM
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Date
Convert the OMAP HDQ driver to use runtime PM.  Compile- and boot-tested,
but not tested in actual use.

Signed-off-by: Paul Walmsley <paul@pwsan.com>
Cc: NeilBrown <neilb@suse.de>
Cc: Evgeniy Polyakov <zbr@ioremap.net>
---
drivers/w1/masters/omap_hdq.c | 78 +++++++----------------------------------
1 files changed, 13 insertions(+), 65 deletions(-)
diff --git a/drivers/w1/masters/omap_hdq.c b/drivers/w1/masters/omap_hdq.c
index 5ef385b..63e3eda 100644
--- a/drivers/w1/masters/omap_hdq.c
+++ b/drivers/w1/masters/omap_hdq.c
@@ -1,7 +1,7 @@
/*
* drivers/w1/masters/omap_hdq.c
*
- * Copyright (C) 2007 Texas Instruments, Inc.
+ * Copyright (C) 2007,2012 Texas Instruments, Inc.
*
* This file is licensed under the terms of the GNU General Public License
* version 2. This program is licensed "as is" without any warranty of any
@@ -14,9 +14,9 @@
#include <linux/interrupt.h>
#include <linux/slab.h>
#include <linux/err.h>
-#include <linux/clk.h>
#include <linux/io.h>
#include <linux/sched.h>
+#include <linux/pm_runtime.h>

#include <asm/irq.h>
#include <mach/hardware.h>
@@ -61,8 +61,6 @@ struct hdq_data {
/* lock status update */
struct mutex hdq_mutex;
int hdq_usecount;
- struct clk *hdq_ick;
- struct clk *hdq_fck;
u8 hdq_irqstatus;
/* device lock */
spinlock_t hdq_spinlock;
@@ -419,17 +417,8 @@ static int omap_hdq_get(struct hdq_data *hdq_data)
hdq_data->hdq_usecount++;
try_module_get(THIS_MODULE);
if (1 == hdq_data->hdq_usecount) {
- if (clk_enable(hdq_data->hdq_ick)) {
- dev_dbg(hdq_data->dev, "Can not enable ick\n");
- ret = -ENODEV;
- goto clk_err;
- }
- if (clk_enable(hdq_data->hdq_fck)) {
- dev_dbg(hdq_data->dev, "Can not enable fck\n");
- clk_disable(hdq_data->hdq_ick);
- ret = -ENODEV;
- goto clk_err;
- }
+
+ pm_runtime_get_sync(hdq_data->dev);

/* make sure HDQ is out of reset */
if (!(hdq_reg_in(hdq_data, OMAP_HDQ_SYSSTATUS) &
@@ -450,9 +439,6 @@ static int omap_hdq_get(struct hdq_data *hdq_data)
}
}

-clk_err:
- clk_put(hdq_data->hdq_ick);
- clk_put(hdq_data->hdq_fck);
out:
mutex_unlock(&hdq_data->hdq_mutex);
rtn:
@@ -475,10 +461,8 @@ static int omap_hdq_put(struct hdq_data *hdq_data)
} else {
hdq_data->hdq_usecount--;
module_put(THIS_MODULE);
- if (0 == hdq_data->hdq_usecount) {
- clk_disable(hdq_data->hdq_ick);
- clk_disable(hdq_data->hdq_fck);
- }
+ if (0 == hdq_data->hdq_usecount)
+ pm_runtime_put_sync(hdq_data->dev);
}
mutex_unlock(&hdq_data->hdq_mutex);

@@ -591,35 +575,11 @@ static int __devinit omap_hdq_probe(struct platform_device *pdev)
goto err_ioremap;
}

- /* get interface & functional clock objects */
- hdq_data->hdq_ick = clk_get(&pdev->dev, "ick");
- if (IS_ERR(hdq_data->hdq_ick)) {
- dev_dbg(&pdev->dev, "Can't get HDQ ick clock object\n");
- ret = PTR_ERR(hdq_data->hdq_ick);
- goto err_ick;
- }
-
- hdq_data->hdq_fck = clk_get(&pdev->dev, "fck");
- if (IS_ERR(hdq_data->hdq_fck)) {
- dev_dbg(&pdev->dev, "Can't get HDQ fck clock object\n");
- ret = PTR_ERR(hdq_data->hdq_fck);
- goto err_fck;
- }
-
hdq_data->hdq_usecount = 0;
mutex_init(&hdq_data->hdq_mutex);

- if (clk_enable(hdq_data->hdq_ick)) {
- dev_dbg(&pdev->dev, "Can not enable ick\n");
- ret = -ENODEV;
- goto err_intfclk;
- }
-
- if (clk_enable(hdq_data->hdq_fck)) {
- dev_dbg(&pdev->dev, "Can not enable fck\n");
- ret = -ENODEV;
- goto err_fnclk;
- }
+ pm_runtime_enable(&pdev->dev);
+ pm_runtime_get_sync(&pdev->dev);

rev = hdq_reg_in(hdq_data, OMAP_HDQ_REVISION);
dev_info(&pdev->dev, "OMAP HDQ Hardware Rev %c.%c. Driver in %s mode\n",
@@ -641,9 +601,7 @@ static int __devinit omap_hdq_probe(struct platform_device *pdev)

omap_hdq_break(hdq_data);

- /* don't clock the HDQ until it is needed */
- clk_disable(hdq_data->hdq_ick);
- clk_disable(hdq_data->hdq_fck);
+ pm_runtime_put_sync(&pdev->dev);

omap_w1_master.data = hdq_data;

@@ -655,20 +613,11 @@ static int __devinit omap_hdq_probe(struct platform_device *pdev)

return 0;

-err_w1:
err_irq:
- clk_disable(hdq_data->hdq_fck);
-
-err_fnclk:
- clk_disable(hdq_data->hdq_ick);
-
-err_intfclk:
- clk_put(hdq_data->hdq_fck);
-
-err_fck:
- clk_put(hdq_data->hdq_ick);
+ pm_runtime_put_sync(&pdev->dev);
+err_w1:
+ pm_runtime_disable(&pdev->dev);

-err_ick:
iounmap(hdq_data->hdq_base);

err_ioremap:
@@ -696,8 +645,7 @@ static int omap_hdq_remove(struct platform_device *pdev)
mutex_unlock(&hdq_data->hdq_mutex);

/* remove module dependency */
- clk_put(hdq_data->hdq_ick);
- clk_put(hdq_data->hdq_fck);
+ pm_runtime_disable(&pdev->dev);
free_irq(INT_24XX_HDQ_IRQ, hdq_data);
platform_set_drvdata(pdev, NULL);
iounmap(hdq_data->hdq_base);



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