hwrng: OMAP: store per-device data in per-device variables, not file statics

Encapsulate all of the RNG per-device state into a single per-device
structure record, as opposed to a set of per-driver file variables.

Signed-off-by: Paul Walmsley <paul@pwsan.com>
Cc: Matt Mackall <mpm@selenic.com>
Cc: Herbert Xu <herbert@gondor.apana.org.au>
Acked-by: Herbert Xu <herbert@gondor.apana.org.au>

1 files changed, 77 insertions, 38 deletions

diff --git a/drivers/char/hw_random/omap-rng.c b/drivers/char/hw_random/omap-rng.c
index 4fbdceb6f773..e0f0b9839862 100644
--- a/drivers/char/hw_random/omap-rng.c
+++ b/drivers/char/hw_random/omap-rng.c
@@ -23,6 +23,7 @@
 #include <linux/platform_device.h>
 #include <linux/hw_random.h>
 #include <linux/delay.h>
+#include <linux/slab.h>
 
 #include <asm/io.h>
 
@@ -46,26 +47,38 @@
 #define RNG_SYSSTATUS           0x44            /* System status
                                                         [0] = RESETDONE */
 
-static void __iomem *rng_base;
-static struct clk *rng_ick;
-static struct platform_device *rng_dev;
+/**
+ * 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;
+};
 
-static inline u32 omap_rng_read_reg(int reg)
+static inline u32 omap_rng_read_reg(struct omap_rng_private_data *priv, int reg)
 {
-        return __raw_readl(rng_base + reg);
+        return __raw_readl(priv->base + reg);
 }
 
-static inline void omap_rng_write_reg(int reg, u32 val)
+static inline void omap_rng_write_reg(struct omap_rng_private_data *priv,
+                                      int reg, u32 val)
 {
-        __raw_writel(val, rng_base + reg);
+        __raw_writel(val, priv->base + reg);
 }
 
 static int omap_rng_data_present(struct hwrng *rng, int wait)
 {
+        struct omap_rng_private_data *priv;
         int data, i;
 
+        priv = (struct omap_rng_private_data *)rng->priv;
+
         for (i = 0; i < 20; i++) {
-                data = omap_rng_read_reg(RNG_STAT_REG) ? 0 : 1;
+                data = omap_rng_read_reg(priv, RNG_STAT_REG) ? 0 : 1;
                 if (data || !wait)
                         break;
                 /* RNG produces data fast enough (2+ MBit/sec, even
@@ -80,9 +93,13 @@ static int omap_rng_data_present(struct hwrng *rng, int wait)
 
 static int omap_rng_data_read(struct hwrng *rng, u32 *data)
 {
-        *data = omap_rng_read_reg(RNG_OUT_REG);
+        struct omap_rng_private_data *priv;
+
+        priv = (struct omap_rng_private_data *)rng->priv;
+
+        *data = omap_rng_read_reg(priv, RNG_OUT_REG);
 
-        return 4;
+        return sizeof(u32);
 }
 
 static struct hwrng omap_rng_ops = {
@@ -93,69 +110,85 @@ static struct hwrng omap_rng_ops = {
 
 static int __devinit omap_rng_probe(struct platform_device *pdev)
 {
-        struct resource *res;
+        struct omap_rng_private_data *priv;
         int ret;
 
-        /*
-         * A bit ugly, and it will never actually happen but there can
-         * be only one RNG and this catches any bork
-         */
-        if (rng_dev)
-                return -EBUSY;
+        priv = kzalloc(sizeof(struct omap_rng_private_data), GFP_KERNEL);
+        if (!priv) {
+                dev_err(&pdev->dev, "could not allocate memory\n");
+                return -ENOMEM;
+        };
+
+        omap_rng_ops.priv = (unsigned long)priv;
+        dev_set_drvdata(&pdev->dev, priv);
 
         if (cpu_is_omap24xx()) {
-                rng_ick = clk_get(&pdev->dev, "ick");
-                if (IS_ERR(rng_ick)) {
+                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(rng_ick);
+                        ret = PTR_ERR(priv->clk);
                         return ret;
-                } else
-                        clk_enable(rng_ick);
+                } else {
+                        clk_enable(priv->clk);
+                }
         }
 
-        res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+        priv->mem_res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+        if (!priv->mem_res) {
+                ret = -ENOENT;
+                goto err_ioremap;
+        }
 
-        rng_base = devm_request_and_ioremap(&pdev->dev, res);
-        if (!rng_base) {
+        priv->base = devm_request_and_ioremap(&pdev->dev, priv->mem_res);
+        if (!priv->base) {
                 ret = -ENOMEM;
                 goto err_ioremap;
         }
-        dev_set_drvdata(&pdev->dev, res);
+        dev_set_drvdata(&pdev->dev, priv);
 
         ret = hwrng_register(&omap_rng_ops);
         if (ret)
                 goto err_register;
 
         dev_info(&pdev->dev, "OMAP Random Number Generator ver. %02x\n",
-                omap_rng_read_reg(RNG_REV_REG));
-        omap_rng_write_reg(RNG_MASK_REG, 0x1);
+                 omap_rng_read_reg(priv, RNG_REV_REG));
+
 
-        rng_dev = pdev;
+        omap_rng_write_reg(priv, RNG_MASK_REG, 0x1);
 
         return 0;
 
 err_register:
-        rng_base = NULL;
+        priv->base = NULL;
 err_ioremap:
         if (cpu_is_omap24xx()) {
-                clk_disable(rng_ick);
-                clk_put(rng_ick);
+                clk_disable(priv->clk);
+                clk_put(priv->clk);
         }
+
+        kfree(priv);
+
         return ret;
 }
 
 static int __exit omap_rng_remove(struct platform_device *pdev)
 {
+        struct omap_rng_private_data *priv = dev_get_drvdata(&pdev->dev);
+
         hwrng_unregister(&omap_rng_ops);
 
-        omap_rng_write_reg(RNG_MASK_REG, 0x0);
+        omap_rng_write_reg(priv, RNG_MASK_REG, 0x0);
+
+        iounmap(priv->base);
 
         if (cpu_is_omap24xx()) {
-                clk_disable(rng_ick);
-                clk_put(rng_ick);
+                clk_disable(priv->clk);
+                clk_put(priv->clk);
         }
 
-        rng_base = NULL;
+        release_mem_region(priv->mem_res->start, resource_size(priv->mem_res));
+
+        kfree(priv);
 
         return 0;
 }
@@ -164,13 +197,19 @@ static int __exit omap_rng_remove(struct platform_device *pdev)
 
 static int omap_rng_suspend(struct device *dev)
 {
-        omap_rng_write_reg(RNG_MASK_REG, 0x0);
+        struct omap_rng_private_data *priv = dev_get_drvdata(dev);
+
+        omap_rng_write_reg(priv, RNG_MASK_REG, 0x0);
+
         return 0;
 }
 
 static int omap_rng_resume(struct device *dev)
 {
-        omap_rng_write_reg(RNG_MASK_REG, 0x1);
+        struct omap_rng_private_data *priv = dev_get_drvdata(dev);
+
+        omap_rng_write_reg(priv, RNG_MASK_REG, 0x1);
+
         return 0;
 }