diff options
Diffstat (limited to 'drivers/char/hw_random')
| -rw-r--r-- | drivers/char/hw_random/Kconfig | 13 | ||||
| -rw-r--r-- | drivers/char/hw_random/Makefile | 1 | ||||
| -rw-r--r-- | drivers/char/hw_random/mxc-rnga.c | 108 | ||||
| -rw-r--r-- | drivers/char/hw_random/octeon-rng.c | 17 | ||||
| -rw-r--r-- | drivers/char/hw_random/tpm-rng.c | 50 |
5 files changed, 120 insertions, 69 deletions
diff --git a/drivers/char/hw_random/Kconfig b/drivers/char/hw_random/Kconfig index 7c0d391996b5..fbd9b2b850ef 100644 --- a/drivers/char/hw_random/Kconfig +++ b/drivers/char/hw_random/Kconfig @@ -289,3 +289,16 @@ config HW_RANDOM_EXYNOS module will be called exynos-rng. If unsure, say Y. + +config HW_RANDOM_TPM + tristate "TPM HW Random Number Generator support" + depends on HW_RANDOM && TCG_TPM + default HW_RANDOM + ---help--- + This driver provides kernel-side support for the Random Number + Generator in the Trusted Platform Module + + To compile this driver as a module, choose M here: the + module will be called tpm-rng. + + If unsure, say Y. diff --git a/drivers/char/hw_random/Makefile b/drivers/char/hw_random/Makefile index 39a757ca15b6..1fd7eec9fbf6 100644 --- a/drivers/char/hw_random/Makefile +++ b/drivers/char/hw_random/Makefile @@ -25,3 +25,4 @@ obj-$(CONFIG_HW_RANDOM_PICOXCELL) += picoxcell-rng.o obj-$(CONFIG_HW_RANDOM_PPC4XX) += ppc4xx-rng.o obj-$(CONFIG_HW_RANDOM_PSERIES) += pseries-rng.o obj-$(CONFIG_HW_RANDOM_EXYNOS) += exynos-rng.o +obj-$(CONFIG_HW_RANDOM_TPM) += tpm-rng.o diff --git a/drivers/char/hw_random/mxc-rnga.c b/drivers/char/hw_random/mxc-rnga.c index 85074de5042e..f05d85713fd3 100644 --- a/drivers/char/hw_random/mxc-rnga.c +++ b/drivers/char/hw_random/mxc-rnga.c @@ -59,16 +59,21 @@ #define RNGA_STATUS_LAST_READ_STATUS 0x00000002 #define RNGA_STATUS_SECURITY_VIOLATION 0x00000001 -static struct platform_device *rng_dev; +struct mxc_rng { + struct device *dev; + struct hwrng rng; + void __iomem *mem; + struct clk *clk; +}; static int mxc_rnga_data_present(struct hwrng *rng, int wait) { - void __iomem *rng_base = (void __iomem *)rng->priv; int i; + struct mxc_rng *mxc_rng = container_of(rng, struct mxc_rng, rng); for (i = 0; i < 20; i++) { /* how many random numbers are in FIFO? [0-16] */ - int level = (__raw_readl(rng_base + RNGA_STATUS) & + int level = (__raw_readl(mxc_rng->mem + RNGA_STATUS) & RNGA_STATUS_LEVEL_MASK) >> 8; if (level || !wait) return !!level; @@ -81,20 +86,20 @@ static int mxc_rnga_data_read(struct hwrng *rng, u32 * data) { int err; u32 ctrl; - void __iomem *rng_base = (void __iomem *)rng->priv; + struct mxc_rng *mxc_rng = container_of(rng, struct mxc_rng, rng); /* retrieve a random number from FIFO */ - *data = __raw_readl(rng_base + RNGA_OUTPUT_FIFO); + *data = __raw_readl(mxc_rng->mem + RNGA_OUTPUT_FIFO); /* some error while reading this random number? */ - err = __raw_readl(rng_base + RNGA_STATUS) & RNGA_STATUS_ERROR_INT; + err = __raw_readl(mxc_rng->mem + 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); + dev_dbg(mxc_rng->dev, "Error while reading random number!\n"); + ctrl = __raw_readl(mxc_rng->mem + RNGA_CONTROL); __raw_writel(ctrl | RNGA_CONTROL_CLEAR_INT, - rng_base + RNGA_CONTROL); + mxc_rng->mem + RNGA_CONTROL); return 0; } else return 4; @@ -103,22 +108,22 @@ static int mxc_rnga_data_read(struct hwrng *rng, u32 * data) static int mxc_rnga_init(struct hwrng *rng) { u32 ctrl, osc; - void __iomem *rng_base = (void __iomem *)rng->priv; + struct mxc_rng *mxc_rng = container_of(rng, struct mxc_rng, rng); /* wake up */ - ctrl = __raw_readl(rng_base + RNGA_CONTROL); - __raw_writel(ctrl & ~RNGA_CONTROL_SLEEP, rng_base + RNGA_CONTROL); + ctrl = __raw_readl(mxc_rng->mem + RNGA_CONTROL); + __raw_writel(ctrl & ~RNGA_CONTROL_SLEEP, mxc_rng->mem + RNGA_CONTROL); /* verify if oscillator is working */ - osc = __raw_readl(rng_base + RNGA_STATUS); + osc = __raw_readl(mxc_rng->mem + RNGA_STATUS); if (osc & RNGA_STATUS_OSC_DEAD) { - dev_err(&rng_dev->dev, "RNGA Oscillator is dead!\n"); + dev_err(mxc_rng->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); + ctrl = __raw_readl(mxc_rng->mem + RNGA_CONTROL); + __raw_writel(ctrl | RNGA_CONTROL_GO, mxc_rng->mem + RNGA_CONTROL); return 0; } @@ -126,40 +131,40 @@ static int mxc_rnga_init(struct hwrng *rng) static void mxc_rnga_cleanup(struct hwrng *rng) { u32 ctrl; - void __iomem *rng_base = (void __iomem *)rng->priv; + struct mxc_rng *mxc_rng = container_of(rng, struct mxc_rng, rng); - ctrl = __raw_readl(rng_base + RNGA_CONTROL); + ctrl = __raw_readl(mxc_rng->mem + RNGA_CONTROL); /* stop rnga */ - __raw_writel(ctrl & ~RNGA_CONTROL_GO, rng_base + RNGA_CONTROL); + __raw_writel(ctrl & ~RNGA_CONTROL_GO, mxc_rng->mem + RNGA_CONTROL); } -static struct hwrng mxc_rnga = { - .name = "mxc-rnga", - .init = mxc_rnga_init, - .cleanup = mxc_rnga_cleanup, - .data_present = mxc_rnga_data_present, - .data_read = mxc_rnga_data_read -}; - static int __init mxc_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(&pdev->dev, "rng"); - if (IS_ERR(clk)) { + struct mxc_rng *mxc_rng; + + mxc_rng = devm_kzalloc(&pdev->dev, sizeof(struct mxc_rng), + GFP_KERNEL); + if (!mxc_rng) + return -ENOMEM; + + mxc_rng->dev = &pdev->dev; + mxc_rng->rng.name = "mxc-rnga"; + mxc_rng->rng.init = mxc_rnga_init; + mxc_rng->rng.cleanup = mxc_rnga_cleanup, + mxc_rng->rng.data_present = mxc_rnga_data_present, + mxc_rng->rng.data_read = mxc_rnga_data_read, + + mxc_rng->clk = devm_clk_get(&pdev->dev, NULL); + if (IS_ERR(mxc_rng->clk)) { dev_err(&pdev->dev, "Could not get rng_clk!\n"); - err = PTR_ERR(clk); + err = PTR_ERR(mxc_rng->clk); goto out; } - clk_enable(clk); + clk_prepare_enable(mxc_rng->clk); res = platform_get_resource(pdev, IORESOURCE_MEM, 0); if (!res) { @@ -173,36 +178,27 @@ static int __init mxc_rnga_probe(struct platform_device *pdev) goto err_region; } - rng_base = ioremap(res->start, resource_size(res)); - if (!rng_base) { + mxc_rng->mem = ioremap(res->start, resource_size(res)); + if (!mxc_rng->mem) { err = -ENOMEM; goto err_ioremap; } - mxc_rnga.priv = (unsigned long)rng_base; - - err = hwrng_register(&mxc_rnga); + err = hwrng_register(&mxc_rng->rng); if (err) { dev_err(&pdev->dev, "MXC RNGA registering failed (%d)\n", err); - goto err_register; + goto err_ioremap; } - rng_dev = pdev; - dev_info(&pdev->dev, "MXC RNGA Registered.\n"); return 0; -err_register: - iounmap(rng_base); - rng_base = NULL; - err_ioremap: release_mem_region(res->start, resource_size(res)); err_region: - clk_disable(clk); - clk_put(clk); + clk_disable_unprepare(mxc_rng->clk); out: return err; @@ -211,17 +207,15 @@ out: static int __exit mxc_rnga_remove(struct platform_device *pdev) { struct resource *res = platform_get_resource(pdev, IORESOURCE_MEM, 0); - void __iomem *rng_base = (void __iomem *)mxc_rnga.priv; - struct clk *clk = clk_get(&pdev->dev, "rng"); + struct mxc_rng *mxc_rng = platform_get_drvdata(pdev); - hwrng_unregister(&mxc_rnga); + hwrng_unregister(&mxc_rng->rng); - iounmap(rng_base); + iounmap(mxc_rng->mem); release_mem_region(res->start, resource_size(res)); - clk_disable(clk); - clk_put(clk); + clk_disable_unprepare(mxc_rng->clk); return 0; } diff --git a/drivers/char/hw_random/octeon-rng.c b/drivers/char/hw_random/octeon-rng.c index 0943edc782a1..5c34c092af71 100644 --- a/drivers/char/hw_random/octeon-rng.c +++ b/drivers/char/hw_random/octeon-rng.c @@ -75,42 +75,35 @@ static int __devinit octeon_rng_probe(struct platform_device *pdev) res_ports = platform_get_resource(pdev, IORESOURCE_MEM, 0); if (!res_ports) - goto err_ports; + return -ENOENT; res_result = platform_get_resource(pdev, IORESOURCE_MEM, 1); if (!res_result) - goto err_ports; + return -ENOENT; rng->control_status = devm_ioremap_nocache(&pdev->dev, res_ports->start, sizeof(u64)); if (!rng->control_status) - goto err_ports; + return -ENOENT; rng->result = devm_ioremap_nocache(&pdev->dev, res_result->start, sizeof(u64)); if (!rng->result) - goto err_r; + return -ENOENT; rng->ops = ops; dev_set_drvdata(&pdev->dev, &rng->ops); ret = hwrng_register(&rng->ops); if (ret) - goto err; + return -ENOENT; dev_info(&pdev->dev, "Octeon Random Number Generator\n"); return 0; -err: - devm_iounmap(&pdev->dev, rng->control_status); -err_r: - devm_iounmap(&pdev->dev, rng->result); -err_ports: - devm_kfree(&pdev->dev, rng); - return -ENOENT; } static int __exit octeon_rng_remove(struct platform_device *pdev) diff --git a/drivers/char/hw_random/tpm-rng.c b/drivers/char/hw_random/tpm-rng.c new file mode 100644 index 000000000000..d6d448266f07 --- /dev/null +++ b/drivers/char/hw_random/tpm-rng.c @@ -0,0 +1,50 @@ +/* + * Copyright (C) 2012 Kent Yoder IBM Corporation + * + * HWRNG interfaces to pull RNG data from a TPM + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License version 2 as + * published by the Free Software Foundation. + * + * 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. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write to the Free Software + * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA + */ + +#include <linux/module.h> +#include <linux/hw_random.h> +#include <linux/tpm.h> + +#define MODULE_NAME "tpm-rng" + +static int tpm_rng_read(struct hwrng *rng, void *data, size_t max, bool wait) +{ + return tpm_get_random(TPM_ANY_NUM, data, max); +} + +static struct hwrng tpm_rng = { + .name = MODULE_NAME, + .read = tpm_rng_read, +}; + +static int __init rng_init(void) +{ + return hwrng_register(&tpm_rng); +} +module_init(rng_init); + +static void __exit rng_exit(void) +{ + hwrng_unregister(&tpm_rng); +} +module_exit(rng_exit); + +MODULE_LICENSE("GPL v2"); +MODULE_AUTHOR("Kent Yoder <key@linux.vnet.ibm.com>"); +MODULE_DESCRIPTION("RNG driver for TPM devices"); |