crypto4xx: integrate ppc4xx-rng into crypto4xx

This patch integrates the ppc4xx-rng driver into the existing
crypto4xx. This is because the true random number generator
is controlled and part of the security core.

Signed-off-by: Christian Lamparter <chunkeey@googlemail.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>

3 files changed, 0 insertions, 161 deletions

diff --git a/drivers/char/hw_random/Kconfig b/drivers/char/hw_random/Kconfig
index c76a88da8d04..ac51149e9777 100644
--- a/drivers/char/hw_random/Kconfig
+++ b/drivers/char/hw_random/Kconfig
@@ -268,19 +268,6 @@ config HW_RANDOM_NOMADIK
 
 	  If unsure, say Y.
 
-config HW_RANDOM_PPC4XX
-	tristate "PowerPC 4xx generic true random number generator support"
-	depends on PPC && 4xx
-	default HW_RANDOM
-	---help---
-	 This driver provides the kernel-side support for the TRNG hardware
-	 found in the security function of some PowerPC 4xx SoCs.
-
-	 To compile this driver as a module, choose M here: the
-	 module will be called ppc4xx-rng.
-
-	 If unsure, say N.
-
 config HW_RANDOM_PSERIES
 	tristate "pSeries HW Random Number Generator support"
 	depends on PPC64 && IBMVIO
diff --git a/drivers/char/hw_random/Makefile b/drivers/char/hw_random/Makefile
index e09305bb89e1..63022b49f160 100644
--- a/drivers/char/hw_random/Makefile
+++ b/drivers/char/hw_random/Makefile
@@ -22,7 +22,6 @@ obj-$(CONFIG_HW_RANDOM_TX4939) += tx4939-rng.o
 obj-$(CONFIG_HW_RANDOM_MXC_RNGA) += mxc-rnga.o
 obj-$(CONFIG_HW_RANDOM_OCTEON) += octeon-rng.o
 obj-$(CONFIG_HW_RANDOM_NOMADIK) += nomadik-rng.o
-obj-$(CONFIG_HW_RANDOM_PPC4XX) += ppc4xx-rng.o
 obj-$(CONFIG_HW_RANDOM_PSERIES) += pseries-rng.o
 obj-$(CONFIG_HW_RANDOM_POWERNV) += powernv-rng.o
 obj-$(CONFIG_HW_RANDOM_EXYNOS)	+= exynos-rng.o
diff --git a/drivers/char/hw_random/ppc4xx-rng.c b/drivers/char/hw_random/ppc4xx-rng.c
deleted file mode 100644
index c0db4387d2e2..000000000000
--- a/drivers/char/hw_random/ppc4xx-rng.c
+++ /dev/null
@@ -1,147 +0,0 @@
-/*
- * Generic PowerPC 44x RNG driver
- *
- * Copyright 2011 IBM Corporation
- *
- * This program is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the
- * Free Software Foundation; version 2 of the License.
- */
-
-#include <linux/module.h>
-#include <linux/kernel.h>
-#include <linux/platform_device.h>
-#include <linux/hw_random.h>
-#include <linux/delay.h>
-#include <linux/of_address.h>
-#include <linux/of_platform.h>
-#include <asm/io.h>
-
-#define PPC4XX_TRNG_DEV_CTRL 0x60080
-
-#define PPC4XX_TRNGE 0x00020000
-#define PPC4XX_TRNG_CTRL 0x0008
-#define PPC4XX_TRNG_CTRL_DALM 0x20
-#define PPC4XX_TRNG_STAT 0x0004
-#define PPC4XX_TRNG_STAT_B 0x1
-#define PPC4XX_TRNG_DATA 0x0000
-
-#define MODULE_NAME "ppc4xx_rng"
-
-static int ppc4xx_rng_data_present(struct hwrng *rng, int wait)
-{
-	void __iomem *rng_regs = (void __iomem *) rng->priv;
-	int busy, i, present = 0;
-
-	for (i = 0; i < 20; i++) {
-		busy = (in_le32(rng_regs + PPC4XX_TRNG_STAT) & PPC4XX_TRNG_STAT_B);
-		if (!busy || !wait) {
-			present = 1;
-			break;
-		}
-		udelay(10);
-	}
-	return present;
-}
-
-static int ppc4xx_rng_data_read(struct hwrng *rng, u32 *data)
-{
-	void __iomem *rng_regs = (void __iomem *) rng->priv;
-	*data = in_le32(rng_regs + PPC4XX_TRNG_DATA);
-	return 4;
-}
-
-static int ppc4xx_rng_enable(int enable)
-{
-	struct device_node *ctrl;
-	void __iomem *ctrl_reg;
-	int err = 0;
-	u32 val;
-
-	/* Find the main crypto device node and map it to turn the TRNG on */
-	ctrl = of_find_compatible_node(NULL, NULL, "amcc,ppc4xx-crypto");
-	if (!ctrl)
-		return -ENODEV;
-
-	ctrl_reg = of_iomap(ctrl, 0);
-	if (!ctrl_reg) {
-		err = -ENODEV;
-		goto out;
-	}
-
-	val = in_le32(ctrl_reg + PPC4XX_TRNG_DEV_CTRL);
-
-	if (enable)
-		val |= PPC4XX_TRNGE;
-	else
-		val = val & ~PPC4XX_TRNGE;
-
-	out_le32(ctrl_reg + PPC4XX_TRNG_DEV_CTRL, val);
-	iounmap(ctrl_reg);
-
-out:
-	of_node_put(ctrl);
-
-	return err;
-}
-
-static struct hwrng ppc4xx_rng = {
-	.name = MODULE_NAME,
-	.data_present = ppc4xx_rng_data_present,
-	.data_read = ppc4xx_rng_data_read,
-};
-
-static int ppc4xx_rng_probe(struct platform_device *dev)
-{
-	void __iomem *rng_regs;
-	int err = 0;
-
-	rng_regs = of_iomap(dev->dev.of_node, 0);
-	if (!rng_regs)
-		return -ENODEV;
-
-	err = ppc4xx_rng_enable(1);
-	if (err)
-		return err;
-
-	out_le32(rng_regs + PPC4XX_TRNG_CTRL, PPC4XX_TRNG_CTRL_DALM);
-	ppc4xx_rng.priv = (unsigned long) rng_regs;
-
-	err = hwrng_register(&ppc4xx_rng);
-
-	return err;
-}
-
-static int ppc4xx_rng_remove(struct platform_device *dev)
-{
-	void __iomem *rng_regs = (void __iomem *) ppc4xx_rng.priv;
-
-	hwrng_unregister(&ppc4xx_rng);
-	ppc4xx_rng_enable(0);
-	iounmap(rng_regs);
-
-	return 0;
-}
-
-static const struct of_device_id ppc4xx_rng_match[] = {
-	{ .compatible = "ppc4xx-rng", },
-	{ .compatible = "amcc,ppc460ex-rng", },
-	{ .compatible = "amcc,ppc440epx-rng", },
-	{},
-};
-MODULE_DEVICE_TABLE(of, ppc4xx_rng_match);
-
-static struct platform_driver ppc4xx_rng_driver = {
-	.driver = {
-		.name = MODULE_NAME,
-		.of_match_table = ppc4xx_rng_match,
-	},
-	.probe = ppc4xx_rng_probe,
-	.remove = ppc4xx_rng_remove,
-};
-
-module_platform_driver(ppc4xx_rng_driver);
-
-MODULE_LICENSE("GPL");
-MODULE_AUTHOR("Josh Boyer <jwboyer@linux.vnet.ibm.com>");
-MODULE_DESCRIPTION("HW RNG driver for PPC 4xx processors");