Root/target/linux/brcm63xx/patches-3.3/021-hw_random-add-Broadcom-BCM63xx-RNG-driver.patch

1From 1cfc5c76c5f48359716bd804daef2f2f7554fb4a Mon Sep 17 00:00:00 2001
2From: Florian Fainelli <florian@openwrt.org>
3Date: Tue, 31 Jan 2012 15:12:25 +0100
4Subject: [PATCH 6/6] hw_random: add Broadcom BCM63xx RNG driver
5
6Signed-off-by: Florian Fainelli <florian@openwrt.org>
7Cc: linux-mips@linux-mips.org
8Cc: mpm@selenic.com
9Cc: herbert@gondor.apana.org.au
10Patchwork: https://patchwork.linux-mips.org/patch/3327/
11Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
12---
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
18
19--- a/drivers/char/hw_random/Kconfig
20+++ b/drivers/char/hw_random/Kconfig
21@@ -73,6 +73,20 @@ config HW_RANDOM_ATMEL
22 
23       If unsure, say Y.
24 
25+config HW_RANDOM_BCM63XX
26+ tristate "Broadcom BCM63xx Random Number Generator support"
27+ depends on HW_RANDOM && BCM63XX
28+ default HW_RANDOM
29+ ---help---
30+ This driver provides kernel-side support for the Random Number
31+ Generator hardware found on the Broadcom BCM63xx SoCs.
32+
33+ To compile this driver as a module, choose M here: the
34+ module will be called bcm63xx-rng
35+
36+ If unusure, say Y.
37+
38+
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
52--- /dev/null
53+++ b/drivers/char/hw_random/bcm63xx-rng.c
54@@ -0,0 +1,175 @@
55+/*
56+ * Broadcom BCM63xx Random Number Generator support
57+ *
58+ * Copyright (C) 2011, Florian Fainelli <florian@openwrt.org>
59+ * Copyright (C) 2009, Broadcom Corporation
60+ *
61+ */
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>
69+
70+#include <bcm63xx_io.h>
71+#include <bcm63xx_regs.h>
72+
73+struct bcm63xx_rng_priv {
74+ struct clk *clk;
75+ void __iomem *regs;
76+};
77+
78+#define to_rng_priv(rng) ((struct bcm63xx_rng_priv *)rng->priv)
79+
80+static int bcm63xx_rng_init(struct hwrng *rng)
81+{
82+ struct bcm63xx_rng_priv *priv = to_rng_priv(rng);
83+ u32 val;
84+
85+ val = bcm_readl(priv->regs + RNG_CTRL);
86+ val |= RNG_EN;
87+ bcm_writel(val, priv->regs + RNG_CTRL);
88+
89+ return 0;
90+}
91+
92+static void bcm63xx_rng_cleanup(struct hwrng *rng)
93+{
94+ struct bcm63xx_rng_priv *priv = to_rng_priv(rng);
95+ u32 val;
96+
97+ val = bcm_readl(priv->regs + RNG_CTRL);
98+ val &= ~RNG_EN;
99+ bcm_writel(val, priv->regs + RNG_CTRL);
100+}
101+
102+static int bcm63xx_rng_data_present(struct hwrng *rng, int wait)
103+{
104+ struct bcm63xx_rng_priv *priv = to_rng_priv(rng);
105+
106+ return bcm_readl(priv->regs + RNG_STAT) & RNG_AVAIL_MASK;
107+}
108+
109+static int bcm63xx_rng_data_read(struct hwrng *rng, u32 *data)
110+{
111+ struct bcm63xx_rng_priv *priv = to_rng_priv(rng);
112+
113+ *data = bcm_readl(priv->regs + RNG_DATA);
114+
115+ return 4;
116+}
117+
118+static int __init bcm63xx_rng_probe(struct platform_device *pdev)
119+{
120+ struct resource *r;
121+ struct clk *clk;
122+ int ret;
123+ struct bcm63xx_rng_priv *priv;
124+ struct hwrng *rng;
125+
126+ r = platform_get_resource(pdev, IORESOURCE_MEM, 0);
127+ if (!r) {
128+ dev_err(&pdev->dev, "no iomem resource\n");
129+ ret = -ENXIO;
130+ goto out;
131+ }
132+
133+ priv = kzalloc(sizeof(*priv), GFP_KERNEL);
134+ if (!priv) {
135+ dev_err(&pdev->dev, "no memory for private structure\n");
136+ ret = -ENOMEM;
137+ goto out;
138+ }
139+
140+ rng = kzalloc(sizeof(*rng), GFP_KERNEL);
141+ if (!rng) {
142+ dev_err(&pdev->dev, "no memory for rng structure\n");
143+ ret = -ENOMEM;
144+ goto out_free_priv;
145+ }
146+
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;
154+
155+ clk = clk_get(&pdev->dev, "ipsec");
156+ if (IS_ERR(clk)) {
157+ dev_err(&pdev->dev, "no clock for device\n");
158+ ret = PTR_ERR(clk);
159+ goto out_free_rng;
160+ }
161+
162+ priv->clk = clk;
163+
164+ if (!devm_request_mem_region(&pdev->dev, r->start,
165+ resource_size(r), pdev->name)) {
166+ dev_err(&pdev->dev, "request mem failed");
167+ ret = -ENOMEM;
168+ goto out_free_rng;
169+ }
170+
171+ priv->regs = devm_ioremap_nocache(&pdev->dev, r->start,
172+ resource_size(r));
173+ if (!priv->regs) {
174+ dev_err(&pdev->dev, "ioremap failed");
175+ ret = -ENOMEM;
176+ goto out_free_rng;
177+ }
178+
179+ clk_enable(clk);
180+
181+ ret = hwrng_register(rng);
182+ if (ret) {
183+ dev_err(&pdev->dev, "failed to register rng device\n");
184+ goto out_clk_disable;
185+ }
186+
187+ dev_info(&pdev->dev, "registered RNG driver\n");
188+
189+ return 0;
190+
191+out_clk_disable:
192+ clk_disable(clk);
193+out_free_rng:
194+ platform_set_drvdata(pdev, NULL);
195+ kfree(rng);
196+out_free_priv:
197+ kfree(priv);
198+out:
199+ return ret;
200+}
201+
202+static int __devexit bcm63xx_rng_remove(struct platform_device *pdev)
203+{
204+ struct hwrng *rng = platform_get_drvdata(pdev);
205+ struct bcm63xx_rng_priv *priv = to_rng_priv(rng);
206+
207+ hwrng_unregister(rng);
208+ clk_disable(priv->clk);
209+ kfree(priv);
210+ kfree(rng);
211+ platform_set_drvdata(pdev, NULL);
212+
213+ return 0;
214+}
215+
216+static struct platform_driver bcm63xx_rng_driver = {
217+ .probe = bcm63xx_rng_probe,
218+ .remove = __devexit_p(bcm63xx_rng_remove),
219+ .driver = {
220+ .name = "bcm63xx-rng",
221+ .owner = THIS_MODULE,
222+ },
223+};
224+
225+module_platform_driver(bcm63xx_rng_driver);
226+
227+MODULE_AUTHOR("Florian Fainelli <florian@openwrt.org>");
228+MODULE_DESCRIPTION("Broadcom BCM63xx RNG driver");
229+MODULE_LICENSE("GPL");
230

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