1 From 1cfc5c76c5f48359716bd804daef2f2f7554fb4a Mon Sep 17 00:00:00 2001
2 From: Florian Fainelli <florian@openwrt.org>
3 Date: Tue, 31 Jan 2012 15:12:25 +0100
4 Subject: [PATCH 6/6] hw_random: add Broadcom BCM63xx RNG driver
6 Signed-off-by: Florian Fainelli <florian@openwrt.org>
7 Cc: linux-mips@linux-mips.org
9 Cc: herbert@gondor.apana.org.au
10 Patchwork: https://patchwork.linux-mips.org/patch/3327/
11 Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
13 drivers/char/hw_random/Kconfig | 14 +++
14 drivers/char/hw_random/Makefile | 1 +
15 drivers/char/hw_random/bcm63xx-rng.c | 175 ++++++++++++++++++++++++++++++++++
16 3 files changed, 190 insertions(+), 0 deletions(-)
17 create mode 100644 drivers/char/hw_random/bcm63xx-rng.c
19 --- a/drivers/char/hw_random/Kconfig
20 +++ b/drivers/char/hw_random/Kconfig
21 @@ -73,6 +73,20 @@ config HW_RANDOM_ATMEL
25 +config HW_RANDOM_BCM63XX
26 + tristate "Broadcom BCM63xx Random Number Generator support"
27 + depends on HW_RANDOM && BCM63XX
30 + This driver provides kernel-side support for the Random Number
31 + Generator hardware found on the Broadcom BCM63xx SoCs.
33 + To compile this driver as a module, choose M here: the
34 + module will be called bcm63xx-rng
39 config HW_RANDOM_GEODE
40 tristate "AMD Geode HW Random Number Generator support"
41 depends on HW_RANDOM && X86_32 && PCI
42 --- a/drivers/char/hw_random/Makefile
43 +++ b/drivers/char/hw_random/Makefile
44 @@ -8,6 +8,7 @@ obj-$(CONFIG_HW_RANDOM_TIMERIOMEM) += ti
45 obj-$(CONFIG_HW_RANDOM_INTEL) += intel-rng.o
46 obj-$(CONFIG_HW_RANDOM_AMD) += amd-rng.o
47 obj-$(CONFIG_HW_RANDOM_ATMEL) += atmel-rng.o
48 +obj-$(CONFIG_HW_RANDOM_BCM63XX) += bcm63xx-rng.o
49 obj-$(CONFIG_HW_RANDOM_GEODE) += geode-rng.o
50 obj-$(CONFIG_HW_RANDOM_N2RNG) += n2-rng.o
51 n2-rng-y := n2-drv.o n2-asm.o
53 +++ b/drivers/char/hw_random/bcm63xx-rng.c
56 + * Broadcom BCM63xx Random Number Generator support
58 + * Copyright (C) 2011, Florian Fainelli <florian@openwrt.org>
59 + * Copyright (C) 2009, Broadcom Corporation
62 +#include <linux/module.h>
63 +#include <linux/slab.h>
64 +#include <linux/io.h>
65 +#include <linux/err.h>
66 +#include <linux/clk.h>
67 +#include <linux/platform_device.h>
68 +#include <linux/hw_random.h>
70 +#include <bcm63xx_io.h>
71 +#include <bcm63xx_regs.h>
73 +struct bcm63xx_rng_priv {
78 +#define to_rng_priv(rng) ((struct bcm63xx_rng_priv *)rng->priv)
80 +static int bcm63xx_rng_init(struct hwrng *rng)
82 + struct bcm63xx_rng_priv *priv = to_rng_priv(rng);
85 + val = bcm_readl(priv->regs + RNG_CTRL);
87 + bcm_writel(val, priv->regs + RNG_CTRL);
92 +static void bcm63xx_rng_cleanup(struct hwrng *rng)
94 + struct bcm63xx_rng_priv *priv = to_rng_priv(rng);
97 + val = bcm_readl(priv->regs + RNG_CTRL);
99 + bcm_writel(val, priv->regs + RNG_CTRL);
102 +static int bcm63xx_rng_data_present(struct hwrng *rng, int wait)
104 + struct bcm63xx_rng_priv *priv = to_rng_priv(rng);
106 + return bcm_readl(priv->regs + RNG_STAT) & RNG_AVAIL_MASK;
109 +static int bcm63xx_rng_data_read(struct hwrng *rng, u32 *data)
111 + struct bcm63xx_rng_priv *priv = to_rng_priv(rng);
113 + *data = bcm_readl(priv->regs + RNG_DATA);
118 +static int __init bcm63xx_rng_probe(struct platform_device *pdev)
120 + struct resource *r;
123 + struct bcm63xx_rng_priv *priv;
126 + r = platform_get_resource(pdev, IORESOURCE_MEM, 0);
128 + dev_err(&pdev->dev, "no iomem resource\n");
133 + priv = kzalloc(sizeof(*priv), GFP_KERNEL);
135 + dev_err(&pdev->dev, "no memory for private structure\n");
140 + rng = kzalloc(sizeof(*rng), GFP_KERNEL);
142 + dev_err(&pdev->dev, "no memory for rng structure\n");
144 + goto out_free_priv;
147 + platform_set_drvdata(pdev, rng);
148 + rng->priv = (unsigned long)priv;
149 + rng->name = pdev->name;
150 + rng->init = bcm63xx_rng_init;
151 + rng->cleanup = bcm63xx_rng_cleanup;
152 + rng->data_present = bcm63xx_rng_data_present;
153 + rng->data_read = bcm63xx_rng_data_read;
155 + clk = clk_get(&pdev->dev, "ipsec");
157 + dev_err(&pdev->dev, "no clock for device\n");
158 + ret = PTR_ERR(clk);
164 + if (!devm_request_mem_region(&pdev->dev, r->start,
165 + resource_size(r), pdev->name)) {
166 + dev_err(&pdev->dev, "request mem failed");
171 + priv->regs = devm_ioremap_nocache(&pdev->dev, r->start,
174 + dev_err(&pdev->dev, "ioremap failed");
181 + ret = hwrng_register(rng);
183 + dev_err(&pdev->dev, "failed to register rng device\n");
184 + goto out_clk_disable;
187 + dev_info(&pdev->dev, "registered RNG driver\n");
194 + platform_set_drvdata(pdev, NULL);
202 +static int __devexit bcm63xx_rng_remove(struct platform_device *pdev)
204 + struct hwrng *rng = platform_get_drvdata(pdev);
205 + struct bcm63xx_rng_priv *priv = to_rng_priv(rng);
207 + hwrng_unregister(rng);
208 + clk_disable(priv->clk);
211 + platform_set_drvdata(pdev, NULL);
216 +static struct platform_driver bcm63xx_rng_driver = {
217 + .probe = bcm63xx_rng_probe,
218 + .remove = __devexit_p(bcm63xx_rng_remove),
220 + .name = "bcm63xx-rng",
221 + .owner = THIS_MODULE,
225 +module_platform_driver(bcm63xx_rng_driver);
227 +MODULE_AUTHOR("Florian Fainelli <florian@openwrt.org>");
228 +MODULE_DESCRIPTION("Broadcom BCM63xx RNG driver");
229 +MODULE_LICENSE("GPL");