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openwrtv4/target/linux/apm821xx/patches-4.4/001-crypto4xx-integrate-ppc4xx-rng-into-crypto4xx.patch
Chris Blake 3827ce2c3d apm821xx: add support for the apm821xx device target 
This adds a new target for PowerPC APM82181 and APM82161
(464-based) boards, as well as adds support for the booke-wdt
watchdog package.

Signed-off-by: Chris Blake <chrisrblake93@gmail.com>
2016-07-22 09:48:12 +02:00

507 lines
15 KiB
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From 5343e674f32fb82b7a80a24b5a84eee62d3fe624 Mon Sep 17 00:00:00 2001
From: Christian Lamparter <chunkeey@googlemail.com>
Date: Mon, 18 Apr 2016 12:57:41 +0200
Subject: [PATCH] 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>
---
drivers/char/hw_random/Kconfig | 13 ---
drivers/char/hw_random/Makefile | 1 -
drivers/char/hw_random/ppc4xx-rng.c | 147 --------------------------------
drivers/crypto/Kconfig | 8 ++
drivers/crypto/amcc/Makefile | 1 +
drivers/crypto/amcc/crypto4xx_core.c | 7 +-
drivers/crypto/amcc/crypto4xx_core.h | 4 +
drivers/crypto/amcc/crypto4xx_reg_def.h | 1 +
drivers/crypto/amcc/crypto4xx_trng.c | 131 ++++++++++++++++++++++++++++
drivers/crypto/amcc/crypto4xx_trng.h | 34 ++++++++
10 files changed, 184 insertions(+), 163 deletions(-)
delete mode 100644 drivers/char/hw_random/ppc4xx-rng.c
create mode 100644 drivers/crypto/amcc/crypto4xx_trng.c
create mode 100644 drivers/crypto/amcc/crypto4xx_trng.h
diff --git a/drivers/char/hw_random/Kconfig b/drivers/char/hw_random/Kconfig
index c76a88d..ac51149 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 e09305b..63022b4 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 c0db438..0000000
--- 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");
diff --git a/drivers/crypto/Kconfig b/drivers/crypto/Kconfig
index 0a22ac7..12fd499 100644
--- a/drivers/crypto/Kconfig
+++ b/drivers/crypto/Kconfig
@@ -279,6 +279,14 @@ config CRYPTO_DEV_PPC4XX
help
This option allows you to have support for AMCC crypto acceleration.
+config HW_RANDOM_PPC4XX
+ bool "PowerPC 4xx generic true random number generator support"
+ depends on CRYPTO_DEV_PPC4XX && HW_RANDOM
+ default y
+ ---help---
+ This option provides the kernel-side support for the TRNG hardware
+ found in the security function of some PowerPC 4xx SoCs.
+
config CRYPTO_DEV_OMAP_SHAM
tristate "Support for OMAP MD5/SHA1/SHA2 hw accelerator"
depends on ARCH_OMAP2PLUS
diff --git a/drivers/crypto/amcc/Makefile b/drivers/crypto/amcc/Makefile
index 5c0c62b..b955399 100644
--- a/drivers/crypto/amcc/Makefile
+++ b/drivers/crypto/amcc/Makefile
@@ -1,2 +1,3 @@
obj-$(CONFIG_CRYPTO_DEV_PPC4XX) += crypto4xx.o
crypto4xx-y := crypto4xx_core.o crypto4xx_alg.o crypto4xx_sa.o
+crypto4xx-$(CONFIG_HW_RANDOM_PPC4XX) += crypto4xx_trng.o
diff --git a/drivers/crypto/amcc/crypto4xx_core.c b/drivers/crypto/amcc/crypto4xx_core.c
index 62134c8..dae1e39 100644
--- a/drivers/crypto/amcc/crypto4xx_core.c
+++ b/drivers/crypto/amcc/crypto4xx_core.c
@@ -40,6 +40,7 @@
#include "crypto4xx_reg_def.h"
#include "crypto4xx_core.h"
#include "crypto4xx_sa.h"
+#include "crypto4xx_trng.h"
#define PPC4XX_SEC_VERSION_STR "0.5"
@@ -1225,6 +1226,7 @@ static int crypto4xx_probe(struct platform_device *ofdev)
if (rc)
goto err_start_dev;
+ ppc4xx_trng_probe(core_dev);
return 0;
err_start_dev:
@@ -1252,6 +1254,8 @@ static int crypto4xx_remove(struct platform_device *ofdev)
struct device *dev = &ofdev->dev;
struct crypto4xx_core_device *core_dev = dev_get_drvdata(dev);
+ ppc4xx_trng_remove(core_dev);
+
free_irq(core_dev->irq, dev);
irq_dispose_mapping(core_dev->irq);
@@ -1272,7 +1276,7 @@ MODULE_DEVICE_TABLE(of, crypto4xx_match);
static struct platform_driver crypto4xx_driver = {
.driver = {
- .name = "crypto4xx",
+ .name = MODULE_NAME,
.of_match_table = crypto4xx_match,
},
.probe = crypto4xx_probe,
@@ -1284,4 +1288,3 @@ module_platform_driver(crypto4xx_driver);
MODULE_LICENSE("GPL");
MODULE_AUTHOR("James Hsiao <jhsiao@amcc.com>");
MODULE_DESCRIPTION("Driver for AMCC PPC4xx crypto accelerator");
-
diff --git a/drivers/crypto/amcc/crypto4xx_core.h b/drivers/crypto/amcc/crypto4xx_core.h
index bac0bde..ecfdcfe 100644
--- a/drivers/crypto/amcc/crypto4xx_core.h
+++ b/drivers/crypto/amcc/crypto4xx_core.h
@@ -24,6 +24,8 @@
#include <crypto/internal/hash.h>
+#define MODULE_NAME "crypto4xx"
+
#define PPC460SX_SDR0_SRST 0x201
#define PPC405EX_SDR0_SRST 0x200
#define PPC460EX_SDR0_SRST 0x201
@@ -72,6 +74,7 @@ struct crypto4xx_device {
char *name;
u64 ce_phy_address;
void __iomem *ce_base;
+ void __iomem *trng_base;
void *pdr; /* base address of packet
descriptor ring */
@@ -106,6 +109,7 @@ struct crypto4xx_core_device {
struct device *device;
struct platform_device *ofdev;
struct crypto4xx_device *dev;
+ struct hwrng *trng;
u32 int_status;
u32 irq;
struct tasklet_struct tasklet;
diff --git a/drivers/crypto/amcc/crypto4xx_reg_def.h b/drivers/crypto/amcc/crypto4xx_reg_def.h
index 5f5fbc0..46fe57c 100644
--- a/drivers/crypto/amcc/crypto4xx_reg_def.h
+++ b/drivers/crypto/amcc/crypto4xx_reg_def.h
@@ -125,6 +125,7 @@
#define PPC4XX_INTERRUPT_CLR 0x3ffff
#define PPC4XX_PRNG_CTRL_AUTO_EN 0x3
#define PPC4XX_DC_3DES_EN 1
+#define PPC4XX_TRNG_EN 0x00020000
#define PPC4XX_INT_DESCR_CNT 4
#define PPC4XX_INT_TIMEOUT_CNT 0
#define PPC4XX_INT_CFG 1
diff --git a/drivers/crypto/amcc/crypto4xx_trng.c b/drivers/crypto/amcc/crypto4xx_trng.c
new file mode 100644
index 0000000..677ca17
--- /dev/null
+++ b/drivers/crypto/amcc/crypto4xx_trng.c
@@ -0,0 +1,131 @@
+/*
+ * 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/interrupt.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 <linux/io.h>
+
+#include "crypto4xx_core.h"
+#include "crypto4xx_trng.h"
+#include "crypto4xx_reg_def.h"
+
+#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
+
+static int ppc4xx_trng_data_present(struct hwrng *rng, int wait)
+{
+ struct crypto4xx_device *dev = (void *)rng->priv;
+ int busy, i, present = 0;
+
+ for (i = 0; i < 20; i++) {
+ busy = (in_le32(dev->trng_base + PPC4XX_TRNG_STAT) &
+ PPC4XX_TRNG_STAT_B);
+ if (!busy || !wait) {
+ present = 1;
+ break;
+ }
+ udelay(10);
+ }
+ return present;
+}
+
+static int ppc4xx_trng_data_read(struct hwrng *rng, u32 *data)
+{
+ struct crypto4xx_device *dev = (void *)rng->priv;
+ *data = in_le32(dev->trng_base + PPC4XX_TRNG_DATA);
+ return 4;
+}
+
+static void ppc4xx_trng_enable(struct crypto4xx_device *dev, bool enable)
+{
+ u32 device_ctrl;
+
+ device_ctrl = readl(dev->ce_base + CRYPTO4XX_DEVICE_CTRL);
+ if (enable)
+ device_ctrl |= PPC4XX_TRNG_EN;
+ else
+ device_ctrl &= ~PPC4XX_TRNG_EN;
+ writel(device_ctrl, dev->ce_base + CRYPTO4XX_DEVICE_CTRL);
+}
+
+static const struct of_device_id ppc4xx_trng_match[] = {
+ { .compatible = "ppc4xx-rng", },
+ { .compatible = "amcc,ppc460ex-rng", },
+ { .compatible = "amcc,ppc440epx-rng", },
+ {},
+};
+
+void ppc4xx_trng_probe(struct crypto4xx_core_device *core_dev)
+{
+ struct crypto4xx_device *dev = core_dev->dev;
+ struct device_node *trng = NULL;
+ struct hwrng *rng = NULL;
+ int err;
+
+ /* Find the TRNG device node and map it */
+ trng = of_find_matching_node(NULL, ppc4xx_trng_match);
+ if (!trng || !of_device_is_available(trng))
+ return;
+
+ dev->trng_base = of_iomap(trng, 0);
+ of_node_put(trng);
+ if (!dev->trng_base)
+ goto err_out;
+
+ rng = kzalloc(sizeof(*rng), GFP_KERNEL);
+ if (!rng)
+ goto err_out;
+
+ rng->name = MODULE_NAME;
+ rng->data_present = ppc4xx_trng_data_present;
+ rng->data_read = ppc4xx_trng_data_read;
+ rng->priv = (unsigned long) dev;
+ core_dev->trng = rng;
+ ppc4xx_trng_enable(dev, true);
+ out_le32(dev->trng_base + PPC4XX_TRNG_CTRL, PPC4XX_TRNG_CTRL_DALM);
+ err = devm_hwrng_register(core_dev->device, core_dev->trng);
+ if (err) {
+ ppc4xx_trng_enable(dev, false);
+ dev_err(core_dev->device, "failed to register hwrng (%d).\n",
+ err);
+ goto err_out;
+ }
+ return;
+
+err_out:
+ of_node_put(trng);
+ iounmap(dev->trng_base);
+ kfree(rng);
+ dev->trng_base = NULL;
+ core_dev->trng = NULL;
+}
+
+void ppc4xx_trng_remove(struct crypto4xx_core_device *core_dev)
+{
+ if (core_dev && core_dev->trng) {
+ struct crypto4xx_device *dev = core_dev->dev;
+
+ devm_hwrng_unregister(core_dev->device, core_dev->trng);
+ ppc4xx_trng_enable(dev, false);
+ iounmap(dev->trng_base);
+ kfree(core_dev->trng);
+ }
+}
+
+MODULE_ALIAS("ppc4xx_rng");
diff --git a/drivers/crypto/amcc/crypto4xx_trng.h b/drivers/crypto/amcc/crypto4xx_trng.h
new file mode 100644
index 0000000..931d225
--- /dev/null
+++ b/drivers/crypto/amcc/crypto4xx_trng.h
@@ -0,0 +1,34 @@
+/**
+ * AMCC SoC PPC4xx Crypto Driver
+ *
+ * Copyright (c) 2008 Applied Micro Circuits Corporation.
+ * All rights reserved. James Hsiao <jhsiao@amcc.com>
+ *
+ * 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; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * This file defines the security context
+ * associate format.
+ */
+
+#ifndef __CRYPTO4XX_TRNG_H__
+#define __CRYPTO4XX_TRNG_H__
+
+#ifdef CONFIG_HW_RANDOM_PPC4XX
+void ppc4xx_trng_probe(struct crypto4xx_core_device *core_dev);
+void ppc4xx_trng_remove(struct crypto4xx_core_device *core_dev);
+#else
+static inline void ppc4xx_trng_probe(
+ struct crypto4xx_device *dev __maybe_unused) { }
+static inline void ppc4xx_trng_remove(
+ struct crypto4xx_device *dev __maybe_unused) { }
+#endif
+
+#endif
--
2.8.1
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