From d73904309ec0f24dce849bf64fb7669887ca1de1 Mon Sep 17 00:00:00 2001
From: Komal Shah <komal_shah802003@yahoo.com>
Date: Tue, 11 Oct 2005 17:59:54 +0300
Subject: [PATCH] [PATCH] ARM: OMAP: 24xx RNG

Added OMAP24xx RNG support
---
 drivers/char/Kconfig                        | 12 +++----
 drivers/char/Makefile                       |  2 +-
 drivers/char/{omap16xx-rng.c => omap-rng.c} | 39 +++++++++++++--------
 3 files changed, 30 insertions(+), 23 deletions(-)
 rename drivers/char/{omap16xx-rng.c => omap-rng.c} (66%)

diff --git a/drivers/char/Kconfig b/drivers/char/Kconfig
index 35a3fc1b5cb..0c4a062319f 100644
--- a/drivers/char/Kconfig
+++ b/drivers/char/Kconfig
@@ -659,15 +659,13 @@ config HW_RANDOM
 
 	  If unsure, say N.
 
-config OMAP16XX_RNG
-	tristate "OMAP16xx Random Number Generator support"
-	depends on ARCH_OMAP16XX
+config OMAP_RNG
+	tristate "OMAP Random Number Generator support"
+	depends on ARCH_OMAP16XX || ARCH_OMAP24XX
 	---help---
 	  This driver provides kernel-side support for the Random Number
-	  Generator hardware found on OMAP16xx multimedia processors.
-
-	  To compile this driver as a module, choose M here: the
-	  module will be called hw_random.
+	  Generator hardware found on OMAP16xx and OMAP24xx multimedia
+	  processors.
 
 	  If unsure, say N.
 
diff --git a/drivers/char/Makefile b/drivers/char/Makefile
index d7d8df647db..7633a5ad382 100644
--- a/drivers/char/Makefile
+++ b/drivers/char/Makefile
@@ -75,7 +75,7 @@ obj-$(CONFIG_TOSHIBA) += toshiba.o
 obj-$(CONFIG_I8K) += i8k.o
 obj-$(CONFIG_DS1620) += ds1620.o
 obj-$(CONFIG_HW_RANDOM) += hw_random.o
-obj-$(CONFIG_OMAP16XX_RNG) += omap16xx-rng.o
+obj-$(CONFIG_OMAP_RNG) += omap-rng.o
 obj-$(CONFIG_FTAPE) += ftape/
 obj-$(CONFIG_COBALT_LCD) += lcd.o
 obj-$(CONFIG_PPDEV) += ppdev.o
diff --git a/drivers/char/omap16xx-rng.c b/drivers/char/omap-rng.c
similarity index 66%
rename from drivers/char/omap16xx-rng.c
rename to drivers/char/omap-rng.c
index 0638eaacf90..86ecd2939eb 100644
--- a/drivers/char/omap16xx-rng.c
+++ b/drivers/char/omap-rng.c
@@ -1,10 +1,10 @@
 /*
- * drivers/char/omap16xx-rng.c
+ * drivers/char/omap-rng.c
  *
  * Copyright (C) 2005 Nokia Corporation
  * Author: Juha Yrjölä <juha.yrjola@nokia.com>
  *
- * OMAP16xx Random Number Generator driver
+ * OMAP16xx and OMAP24xx Random Number Generator driver
  *
  * This program is free software; you can redistribute it and/or modify
  * it under the terms of the GNU General Public License version 2 as
@@ -15,9 +15,17 @@
 #include <linux/module.h>
 #include <linux/init.h>
 #include <linux/random.h>
+#include <linux/err.h>
+
 #include <asm/io.h>
+#include <asm/hardware/clock.h>
 
+#if defined (CONFIG_ARCH_OMAP16XX)
 #define RNG_BASE	0xfffe5000
+#endif
+#if defined (CONFIG_ARCH_OMAP24XX)
+#define RNG_BASE	0x480A0000
+#endif
 #define RNG_OUT_REG	0x00
 #define RNG_STAT_REG	0x04
 #define RNG_REV_REG	0x3c
@@ -27,6 +35,8 @@
 
 static u32 rng_base = io_p2v(RNG_BASE);
 
+static struct clk *rng_ick = NULL;
+
 static u32 rng_read_reg(int reg)
 {
 	return __raw_readl(rng_base + reg);
@@ -50,10 +60,19 @@ static void rng_feed_entropy(int count)
 
 static int __init rng_init(void)
 {
-	if (!cpu_is_omap16xx())
+	if (!cpu_is_omap16xx() && !cpu_is_omap24xx())
 		return -ENODEV;
 
-	printk("OMAP16xx Random Number Generator ver. %02x\n",
+	if (cpu_is_omap24xx()) {
+		rng_ick = clk_get(NULL, "rng_ick");
+		if (IS_ERR(rng_ick)) {
+			printk(KERN_ERR "omap-rng.c: Could not get rng_ick\n");
+			return PTR_ERR(rng_ick);
+		}
+		clk_use(rng_ick);
+	}
+
+	printk("OMAP Random Number Generator ver. %02x\n",
 	rng_read_reg(RNG_REV_REG));
 	rng_write_reg(RNG_MASK_REG, 0x00000001);
 	rng_feed_entropy(ENTROPY_WORD_COUNT);
@@ -62,14 +81,4 @@ static int __init rng_init(void)
 
 	return 0;
 }
-
-static void __exit rng_cleanup(void)
-{
-}
-
-MODULE_AUTHOR("Juha Yrjölä");
-MODULE_DESCRIPTION("OMAP16xx H/W Random Number Generator (RNG) driver");
-MODULE_LICENSE("GPL");
-
-module_init(rng_init);
-module_exit(rng_cleanup);
+late_initcall(rng_init);
-- 
2.41.1