[PATCH 3/5] hwrng: OMAP: convert to use runtime PM

[Paul Walmsley]

Convert the OMAP onboard hardware RNG driver to use runtime PM.

This allows us to remove some OMAP-specific cpu_is_omap*() calls from
the RNG driver.

Signed-off-by: Paul Walmsley <p...@pwsan.com>
Cc: Matt Mackall <m...@selenic.com>
Cc: Herbert Xu <herb...@gondor.apana.org.au>
---
 drivers/char/hw_random/omap-rng.c |   35 +++++++++--------------------------
 1 file changed, 9 insertions(+), 26 deletions(-)

diff --git a/drivers/char/hw_random/omap-rng.c 
b/drivers/char/hw_random/omap-rng.c
index e0f0b98..748fcc8 100644
--- a/drivers/char/hw_random/omap-rng.c
+++ b/drivers/char/hw_random/omap-rng.c
@@ -18,12 +18,12 @@
 #include <linux/module.h>
 #include <linux/init.h>
 #include <linux/random.h>
-#include <linux/clk.h>
 #include <linux/err.h>
 #include <linux/platform_device.h>
 #include <linux/hw_random.h>
 #include <linux/delay.h>
 #include <linux/slab.h>
+#include <linux/pm_runtime.h>
 
 #include <asm/io.h>
 
@@ -50,12 +50,10 @@
 /**
  * struct omap_rng_private_data - RNG IP block-specific data
  * @base: virtual address of the beginning of the RNG IP block registers
- * @clk: RNG clock
  * @mem_res: struct resource * for the IP block registers physical memory
  */
 struct omap_rng_private_data {
        void __iomem *base;
-       struct clk *clk;
        struct resource *mem_res;
 };
 
@@ -122,17 +120,6 @@ static int __devinit omap_rng_probe(struct platform_device 
*pdev)
        omap_rng_ops.priv = (unsigned long)priv;
        dev_set_drvdata(&pdev->dev, priv);
 
-       if (cpu_is_omap24xx()) {
-               priv->clk = clk_get(&pdev->dev, "ick");
-               if (IS_ERR(priv->clk)) {
-                       dev_err(&pdev->dev, "Could not get rng_ick\n");
-                       ret = PTR_ERR(priv->clk);
-                       return ret;
-               } else {
-                       clk_enable(priv->clk);
-               }
-       }
-
        priv->mem_res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
        if (!priv->mem_res) {
                ret = -ENOENT;
@@ -146,6 +133,9 @@ static int __devinit omap_rng_probe(struct platform_device 
*pdev)
        }
        dev_set_drvdata(&pdev->dev, priv);
 
+       pm_runtime_enable(&pdev->dev);
+       pm_runtime_get_sync(&pdev->dev);
+
        ret = hwrng_register(&omap_rng_ops);
        if (ret)
                goto err_register;
@@ -153,19 +143,14 @@ static int __devinit omap_rng_probe(struct 
platform_device *pdev)
        dev_info(&pdev->dev, "OMAP Random Number Generator ver. %02x\n",
                 omap_rng_read_reg(priv, RNG_REV_REG));
 
-
        omap_rng_write_reg(priv, RNG_MASK_REG, 0x1);
 
        return 0;
 
 err_register:
        priv->base = NULL;
+       pm_runtime_disable(&pdev->dev);
 err_ioremap:
-       if (cpu_is_omap24xx()) {
-               clk_disable(priv->clk);
-               clk_put(priv->clk);
-       }
-
        kfree(priv);
 
        return ret;
@@ -179,12 +164,8 @@ static int __exit omap_rng_remove(struct platform_device 
*pdev)
 
        omap_rng_write_reg(priv, RNG_MASK_REG, 0x0);
 
-       iounmap(priv->base);
-
-       if (cpu_is_omap24xx()) {
-               clk_disable(priv->clk);
-               clk_put(priv->clk);
-       }
+       pm_runtime_put_sync(&pdev->dev);
+       pm_runtime_disable(&pdev->dev);
 
        release_mem_region(priv->mem_res->start, resource_size(priv->mem_res));
 
@@ -200,6 +181,7 @@ static int omap_rng_suspend(struct device *dev)
        struct omap_rng_private_data *priv = dev_get_drvdata(dev);
 
        omap_rng_write_reg(priv, RNG_MASK_REG, 0x0);
+       pm_runtime_put_sync(dev);
 
        return 0;
 }
@@ -208,6 +190,7 @@ static int omap_rng_resume(struct device *dev)
 {
        struct omap_rng_private_data *priv = dev_get_drvdata(dev);
 
+       pm_runtime_get_sync(dev);
        omap_rng_write_reg(priv, RNG_MASK_REG, 0x1);
 
        return 0;


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