diff options
Diffstat (limited to 'drivers/char/hw_random/fsl-rnga.c')
-rw-r--r-- | drivers/char/hw_random/fsl-rnga.c | 238 |
1 files changed, 238 insertions, 0 deletions
diff --git a/drivers/char/hw_random/fsl-rnga.c b/drivers/char/hw_random/fsl-rnga.c new file mode 100644 index 000000000000..20b22bc65d53 --- /dev/null +++ b/drivers/char/hw_random/fsl-rnga.c @@ -0,0 +1,238 @@ +/* + * RNG driver for Freescale RNGA + * + * Copyright 2008-2010 Freescale Semiconductor, Inc. All Rights Reserved. + */ + +/* + * The code contained herein is licensed under the GNU General Public + * License. You may obtain a copy of the GNU General Public License + * Version 2 or later at the following locations: + * + * http://www.opensource.org/licenses/gpl-license.html + * http://www.gnu.org/copyleft/gpl.html + */ + +/* + * Hardware driver for the Intel/AMD/VIA Random Number Generators (RNG) + * (c) Copyright 2003 Red Hat Inc <jgarzik@redhat.com> + * + * derived from + * + * Hardware driver for the AMD 768 Random Number Generator (RNG) + * (c) Copyright 2001 Red Hat Inc <alan@redhat.com> + * + * derived from + * + * Hardware driver for Intel i810 Random Number Generator (RNG) + * Copyright 2000,2001 Jeff Garzik <jgarzik@pobox.com> + * Copyright 2000,2001 Philipp Rumpf <prumpf@mandrakesoft.com> + * + * This file is licensed under the terms of the GNU General Public + * License version 2. This program is licensed "as is" without any + * warranty of any kind, whether express or implied. + */ + +#include <linux/module.h> +#include <linux/init.h> +#include <linux/kernel.h> +#include <linux/clk.h> +#include <linux/err.h> +#include <linux/platform_device.h> +#include <linux/hw_random.h> +#include <linux/io.h> + +/* RNGA Registers */ +#define RNGA_CONTROL 0x00 +#define RNGA_STATUS 0x04 +#define RNGA_ENTROPY 0x08 +#define RNGA_OUTPUT_FIFO 0x0c +#define RNGA_MODE 0x10 +#define RNGA_VERIFICATION_CONTROL 0x14 +#define RNGA_OSC_CONTROL_COUNTER 0x18 +#define RNGA_OSC1_COUNTER 0x1c +#define RNGA_OSC2_COUNTER 0x20 +#define RNGA_OSC_COUNTER_STATUS 0x24 + +/* RNGA Registers Range */ +#define RNG_ADDR_RANGE 0x28 + +/* RNGA Control Register */ +#define RNGA_CONTROL_SLEEP 0x00000010 +#define RNGA_CONTROL_CLEAR_INT 0x00000008 +#define RNGA_CONTROL_MASK_INTS 0x00000004 +#define RNGA_CONTROL_HIGH_ASSURANCE 0x00000002 +#define RNGA_CONTROL_GO 0x00000001 + +#define RNGA_STATUS_LEVEL_MASK 0x0000ff00 + +/* RNGA Status Register */ +#define RNGA_STATUS_OSC_DEAD 0x80000000 +#define RNGA_STATUS_SLEEP 0x00000010 +#define RNGA_STATUS_ERROR_INT 0x00000008 +#define RNGA_STATUS_FIFO_UNDERFLOW 0x00000004 +#define RNGA_STATUS_LAST_READ_STATUS 0x00000002 +#define RNGA_STATUS_SECURITY_VIOLATION 0x00000001 + +static struct platform_device *rng_dev; + +static int fsl_rnga_data_present(struct hwrng *rng) +{ + int level; + u32 rng_base = (u32) rng->priv; + + /* how many random numbers is in FIFO? [0-16] */ + level = ((__raw_readl(rng_base + RNGA_STATUS) & + RNGA_STATUS_LEVEL_MASK) >> 8); + + return level > 0 ? 1 : 0; +} + +static int fsl_rnga_data_read(struct hwrng *rng, u32 * data) +{ + int err; + u32 ctrl, rng_base = (u32) rng->priv; + + /* retrieve a random number from FIFO */ + *data = __raw_readl(rng_base + RNGA_OUTPUT_FIFO); + + /* some error while reading this random number? */ + err = __raw_readl(rng_base + RNGA_STATUS) & RNGA_STATUS_ERROR_INT; + + /* if error: clear error interrupt, but doesn't return random number */ + if (err) { + dev_dbg(&rng_dev->dev, "Error while reading random number!\n"); + ctrl = __raw_readl(rng_base + RNGA_CONTROL); + __raw_writel(ctrl | RNGA_CONTROL_CLEAR_INT, + rng_base + RNGA_CONTROL); + return 0; + } else + return 4; +} + +static int fsl_rnga_init(struct hwrng *rng) +{ + u32 ctrl, osc, rng_base = (u32) rng->priv; + + /* wake up */ + ctrl = __raw_readl(rng_base + RNGA_CONTROL); + __raw_writel(ctrl & ~RNGA_CONTROL_SLEEP, rng_base + RNGA_CONTROL); + + /* verify if oscillator is working */ + osc = __raw_readl(rng_base + RNGA_STATUS); + if (osc & RNGA_STATUS_OSC_DEAD) { + dev_err(&rng_dev->dev, "RNGA Oscillator is dead!\n"); + return -ENODEV; + } + + /* go running */ + ctrl = __raw_readl(rng_base + RNGA_CONTROL); + __raw_writel(ctrl | RNGA_CONTROL_GO, rng_base + RNGA_CONTROL); + + return 0; +} + +static void fsl_rnga_cleanup(struct hwrng *rng) +{ + u32 ctrl, rng_base = (u32) rng->priv; + + ctrl = __raw_readl(rng_base + RNGA_CONTROL); + + /* stop rnga */ + __raw_writel(ctrl & ~RNGA_CONTROL_GO, rng_base + RNGA_CONTROL); +} + +static struct hwrng fsl_rnga = { + .name = "fsl-rnga", + .init = fsl_rnga_init, + .cleanup = fsl_rnga_cleanup, + .data_present = fsl_rnga_data_present, + .data_read = fsl_rnga_data_read +}; + +static int __init fsl_rnga_probe(struct platform_device *pdev) +{ + int err = -ENODEV; + struct clk *clk; + struct resource *res, *mem; + void __iomem *rng_base = NULL; + + if (rng_dev) + return -EBUSY; + + clk = clk_get(NULL, "rng_clk"); + + if (IS_ERR(clk)) { + dev_err(&pdev->dev, "Could not get rng_clk!\n"); + err = PTR_ERR(clk); + return err; + } + + clk_enable(clk); + + res = platform_get_resource(pdev, IORESOURCE_MEM, 0); + + if (!res) + return -ENOENT; + + mem = request_mem_region(res->start, res->end - res->start, pdev->name); + + if (mem == NULL) + return -EBUSY; + + dev_set_drvdata(&pdev->dev, mem); + rng_base = ioremap(res->start, res->end - res->start); + + fsl_rnga.priv = (unsigned long)rng_base; + + err = hwrng_register(&fsl_rnga); + if (err) { + dev_err(&pdev->dev, "FSL RNGA registering failed (%d)\n", err); + return err; + } + + rng_dev = pdev; + + dev_info(&pdev->dev, "FSL RNGA Registered.\n"); + + return 0; +} + +static int __exit fsl_rnga_remove(struct platform_device *pdev) +{ + struct resource *mem = dev_get_drvdata(&pdev->dev); + void __iomem *rng_base = (void __iomem *)fsl_rnga.priv; + + hwrng_unregister(&fsl_rnga); + + release_resource(mem); + + iounmap(rng_base); + + return 0; +} + +static struct platform_driver fsl_rnga_driver = { + .driver = { + .name = "fsl_rnga", + .owner = THIS_MODULE, + }, + .remove = __exit_p(fsl_rnga_remove), +}; + +static int __init mod_init(void) +{ + return platform_driver_probe(&fsl_rnga_driver, fsl_rnga_probe); +} + +static void __exit mod_exit(void) +{ + platform_driver_unregister(&fsl_rnga_driver); +} + +module_init(mod_init); +module_exit(mod_exit); + +MODULE_AUTHOR("Freescale Semiconductor, Inc."); +MODULE_DESCRIPTION("H/W RNGA driver for i.MX"); +MODULE_LICENSE("GPL"); |