225 lines
5.6 KiB
Diff
225 lines
5.6 KiB
Diff
From 21a474b37f905387d8908384a24c13d4f8513113 Mon Sep 17 00:00:00 2001
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From: Florian Fainelli <florian@openwrt.org>
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Date: Wed, 25 Jan 2012 17:40:02 +0100
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Subject: [PATCH 18/63] hw_random: add Broadcom BCM63xx RNG driver
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Signed-off-by: Florian Fainelli <florian@openwrt.org>
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---
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drivers/char/hw_random/Kconfig | 14 +++
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drivers/char/hw_random/Makefile | 1 +
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drivers/char/hw_random/bcm63xx-rng.c | 175 ++++++++++++++++++++++++++++++++++
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3 files changed, 190 insertions(+), 0 deletions(-)
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create mode 100644 drivers/char/hw_random/bcm63xx-rng.c
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--- a/drivers/char/hw_random/Kconfig
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+++ b/drivers/char/hw_random/Kconfig
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@@ -73,6 +73,20 @@ config HW_RANDOM_ATMEL
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If unsure, say Y.
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+config HW_RANDOM_BCM63XX
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+ tristate "Broadcom BCM63xx Random Number Generator support"
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+ depends on HW_RANDOM && BCM63XX
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+ default HW_RANDOM
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+ ---help---
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+ This driver provides kernel-side support for the Random Number
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+ Generator hardware found on the Broadcom BCM63xx SoCs.
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+
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+ To compile this driver as a module, choose M here: the
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+ module will be called bcm63xx-rng
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+
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+ If unusure, say Y.
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+
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+
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config HW_RANDOM_GEODE
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tristate "AMD Geode HW Random Number Generator support"
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depends on HW_RANDOM && X86_32 && PCI
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--- a/drivers/char/hw_random/Makefile
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+++ b/drivers/char/hw_random/Makefile
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@@ -8,6 +8,7 @@ obj-$(CONFIG_HW_RANDOM_TIMERIOMEM) += ti
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obj-$(CONFIG_HW_RANDOM_INTEL) += intel-rng.o
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obj-$(CONFIG_HW_RANDOM_AMD) += amd-rng.o
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obj-$(CONFIG_HW_RANDOM_ATMEL) += atmel-rng.o
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+obj-$(CONFIG_HW_RANDOM_BCM63XX) += bcm63xx-rng.o
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obj-$(CONFIG_HW_RANDOM_GEODE) += geode-rng.o
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obj-$(CONFIG_HW_RANDOM_N2RNG) += n2-rng.o
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n2-rng-y := n2-drv.o n2-asm.o
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--- /dev/null
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+++ b/drivers/char/hw_random/bcm63xx-rng.c
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@@ -0,0 +1,175 @@
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+/*
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+ * Broadcom BCM63xx Random Number Generator support
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+ *
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+ * Copyright (C) 2011, Florian Fainelli <florian@openwrt.org>
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+ * Copyright (C) 2009, Broadcom Corporation
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+ *
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+ */
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+#include <linux/module.h>
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+#include <linux/slab.h>
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+#include <linux/io.h>
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+#include <linux/err.h>
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+#include <linux/clk.h>
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+#include <linux/platform_device.h>
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+#include <linux/hw_random.h>
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+
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+#include <bcm63xx_io.h>
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+#include <bcm63xx_regs.h>
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+
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+struct bcm63xx_trng_priv {
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+ struct clk *clk;
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+ void __iomem *regs;
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+};
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+
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+#define to_trng_priv(rng) ((struct bcm63xx_trng_priv *)rng->priv)
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+
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+static int bcm63xx_trng_init(struct hwrng *rng)
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+{
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+ struct bcm63xx_trng_priv *priv = to_trng_priv(rng);
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+ u32 val;
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+
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+ val = bcm_readl(priv->regs + TRNG_CTRL);
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+ val |= TRNG_EN;
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+ bcm_writel(val, priv->regs + TRNG_CTRL);
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+
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+ return 0;
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+}
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+
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+static void bcm63xx_trng_cleanup(struct hwrng *rng)
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+{
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+ struct bcm63xx_trng_priv *priv = to_trng_priv(rng);
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+ u32 val;
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+
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+ val = bcm_readl(priv->regs + TRNG_CTRL);
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+ val &= ~TRNG_EN;
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+ bcm_writel(val, priv->regs + TRNG_CTRL);
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+}
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+
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+static int bcm63xx_trng_data_present(struct hwrng *rng, int wait)
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+{
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+ struct bcm63xx_trng_priv *priv = to_trng_priv(rng);
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+
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+ return bcm_readl(priv->regs + TRNG_STAT) & TRNG_AVAIL_MASK;
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+}
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+
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+static int bcm63xx_trng_data_read(struct hwrng *rng, u32 *data)
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+{
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+ struct bcm63xx_trng_priv *priv = to_trng_priv(rng);
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+
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+ *data = bcm_readl(priv->regs + TRNG_DATA);
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+
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+ return 4;
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+}
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+
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+static int __init bcm63xx_trng_probe(struct platform_device *pdev)
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+{
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+ struct resource *r;
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+ struct clk *clk;
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+ int ret;
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+ struct bcm63xx_trng_priv *priv;
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+ struct hwrng *rng;
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+
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+ r = platform_get_resource(pdev, IORESOURCE_MEM, 0);
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+ if (!r) {
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+ dev_err(&pdev->dev, "no iomem resource\n");
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+ ret = -ENXIO;
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+ goto out;
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+ }
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+
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+ priv = kzalloc(sizeof(*priv), GFP_KERNEL);
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+ if (!priv) {
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+ dev_err(&pdev->dev, "no memory for private structure\n");
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+ ret = -ENOMEM;
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+ goto out;
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+ }
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+
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+ rng = kzalloc(sizeof(*rng), GFP_KERNEL);
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+ if (!rng) {
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+ dev_err(&pdev->dev, "no memory for rng structure\n");
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+ ret = -ENOMEM;
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+ goto out_free_priv;
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+ }
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+
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+ platform_set_drvdata(pdev, rng);
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+ rng->priv = (unsigned long)priv;
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+ rng->name = pdev->name;
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+ rng->init = bcm63xx_trng_init;
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+ rng->cleanup = bcm63xx_trng_cleanup;
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+ rng->data_present = bcm63xx_trng_data_present;
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+ rng->data_read = bcm63xx_trng_data_read;
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+
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+ clk = clk_get(&pdev->dev, "ipsec");
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+ if (IS_ERR(clk)) {
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+ dev_err(&pdev->dev, "no clock for device\n");
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+ ret = PTR_ERR(clk);
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+ goto out_free_rng;
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+ }
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+
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+ priv->clk = clk;
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+
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+ if (!devm_request_mem_region(&pdev->dev, r->start,
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+ resource_size(r), pdev->name)) {
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+ dev_err(&pdev->dev, "request mem failed");
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+ ret = -ENOMEM;
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+ goto out_free_rng;
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+ }
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+
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+ priv->regs = devm_ioremap_nocache(&pdev->dev, r->start,
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+ resource_size(r));
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+ if (!priv->regs) {
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+ dev_err(&pdev->dev, "ioremap failed");
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+ ret = -ENOMEM;
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+ goto out_free_rng;
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+ }
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+
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+ clk_enable(clk);
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+
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+ ret = hwrng_register(rng);
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+ if (ret) {
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+ dev_err(&pdev->dev, "failed to register rng device\n");
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+ goto out_clk_disable;
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+ }
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+
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+ dev_info(&pdev->dev, "registered RNG driver\n");
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+
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+ return 0;
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+
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+out_clk_disable:
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+ clk_disable(clk);
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+out_free_rng:
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+ platform_set_drvdata(pdev, NULL);
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+ kfree(rng);
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+out_free_priv:
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+ kfree(priv);
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+out:
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+ return ret;
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+}
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+
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+static int __devexit bcm63xx_trng_remove(struct platform_device *pdev)
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+{
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+ struct hwrng *rng = platform_get_drvdata(pdev);
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+ struct bcm63xx_trng_priv *priv = to_trng_priv(rng);
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+
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+ hwrng_unregister(rng);
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+ clk_disable(priv->clk);
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+ kfree(priv);
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+ kfree(rng);
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+ platform_set_drvdata(pdev, NULL);
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+
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+ return 0;
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+}
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+
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+static struct platform_driver bcm63xx_trng_driver = {
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+ .probe = bcm63xx_trng_probe,
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+ .remove = __devexit_p(bcm63xx_trng_remove),
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+ .driver = {
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+ .name = "bcm63xx-trng",
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+ .owner = THIS_MODULE,
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+ },
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+};
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+
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+module_platform_driver(bcm63xx_trng_driver);
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+
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+MODULE_AUTHOR("Florian Fainelli <florian@openwrt.org>");
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+MODULE_DESCRIPTION("Broadcom BCM63xx RNG driver");
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+MODULE_LICENSE("GPL");
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