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author | Linus Torvalds <torvalds@linux-foundation.org> | 2017-05-02 15:53:46 -0700 |
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committer | Linus Torvalds <torvalds@linux-foundation.org> | 2017-05-02 15:53:46 -0700 |
commit | 5a0387a8a8efb90ae7fea1e2e5c62de3efa74691 (patch) | |
tree | 9e5bbbafe7fea01c843d86c7c3d40f29f962c474 /drivers/char/hw_random/exynos-rng.c | |
parent | 204f144c9fcac355843412b6ba1150086488a208 (diff) | |
parent | 929562b144783b9212625305eadcbbd800809643 (diff) | |
download | linux-5a0387a8a8efb90ae7fea1e2e5c62de3efa74691.tar.bz2 |
Merge branch 'linus' of git://git.kernel.org/pub/scm/linux/kernel/git/herbert/crypto-2.6
Pull crypto updates from Herbert Xu:
"Here is the crypto update for 4.12:
API:
- Add batch registration for acomp/scomp
- Change acomp testing to non-unique compressed result
- Extend algorithm name limit to 128 bytes
- Require setkey before accept(2) in algif_aead
Algorithms:
- Add support for deflate rfc1950 (zlib)
Drivers:
- Add accelerated crct10dif for powerpc
- Add crc32 in stm32
- Add sha384/sha512 in ccp
- Add 3des/gcm(aes) for v5 devices in ccp
- Add Queue Interface (QI) backend support in caam
- Add new Exynos RNG driver
- Add ThunderX ZIP driver
- Add driver for hardware random generator on MT7623 SoC"
* 'linus' of git://git.kernel.org/pub/scm/linux/kernel/git/herbert/crypto-2.6: (101 commits)
crypto: stm32 - Fix OF module alias information
crypto: algif_aead - Require setkey before accept(2)
crypto: scomp - add support for deflate rfc1950 (zlib)
crypto: scomp - allow registration of multiple scomps
crypto: ccp - Change ISR handler method for a v5 CCP
crypto: ccp - Change ISR handler method for a v3 CCP
crypto: crypto4xx - rename ce_ring_contol to ce_ring_control
crypto: testmgr - Allow ecb(cipher_null) in FIPS mode
Revert "crypto: arm64/sha - Add constant operand modifier to ASM_EXPORT"
crypto: ccp - Disable interrupts early on unload
crypto: ccp - Use only the relevant interrupt bits
hwrng: mtk - Add driver for hardware random generator on MT7623 SoC
dt-bindings: hwrng: Add Mediatek hardware random generator bindings
crypto: crct10dif-vpmsum - Fix missing preempt_disable()
crypto: testmgr - replace compression known answer test
crypto: acomp - allow registration of multiple acomps
hwrng: n2 - Use devm_kcalloc() in n2rng_probe()
crypto: chcr - Fix error handling related to 'chcr_alloc_shash'
padata: get_next is never NULL
crypto: exynos - Add new Exynos RNG driver
...
Diffstat (limited to 'drivers/char/hw_random/exynos-rng.c')
-rw-r--r-- | drivers/char/hw_random/exynos-rng.c | 231 |
1 files changed, 0 insertions, 231 deletions
diff --git a/drivers/char/hw_random/exynos-rng.c b/drivers/char/hw_random/exynos-rng.c deleted file mode 100644 index 23d358553b21..000000000000 --- a/drivers/char/hw_random/exynos-rng.c +++ /dev/null @@ -1,231 +0,0 @@ -/* - * exynos-rng.c - Random Number Generator driver for the exynos - * - * Copyright (C) 2012 Samsung Electronics - * Jonghwa Lee <jonghwa3.lee@samsung.com> - * - * This program is free software; you can redistribute it and/or modify - * it under the terms of the GNU General Public License 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/hw_random.h> -#include <linux/kernel.h> -#include <linux/module.h> -#include <linux/io.h> -#include <linux/platform_device.h> -#include <linux/clk.h> -#include <linux/pm_runtime.h> -#include <linux/err.h> - -#define EXYNOS_PRNG_STATUS_OFFSET 0x10 -#define EXYNOS_PRNG_SEED_OFFSET 0x140 -#define EXYNOS_PRNG_OUT1_OFFSET 0x160 -#define SEED_SETTING_DONE BIT(1) -#define PRNG_START 0x18 -#define PRNG_DONE BIT(5) -#define EXYNOS_AUTOSUSPEND_DELAY 100 - -struct exynos_rng { - struct device *dev; - struct hwrng rng; - void __iomem *mem; - struct clk *clk; -}; - -static u32 exynos_rng_readl(struct exynos_rng *rng, u32 offset) -{ - return readl_relaxed(rng->mem + offset); -} - -static void exynos_rng_writel(struct exynos_rng *rng, u32 val, u32 offset) -{ - writel_relaxed(val, rng->mem + offset); -} - -static int exynos_rng_configure(struct exynos_rng *exynos_rng) -{ - int i; - int ret = 0; - - for (i = 0 ; i < 5 ; i++) - exynos_rng_writel(exynos_rng, jiffies, - EXYNOS_PRNG_SEED_OFFSET + 4*i); - - if (!(exynos_rng_readl(exynos_rng, EXYNOS_PRNG_STATUS_OFFSET) - & SEED_SETTING_DONE)) - ret = -EIO; - - return ret; -} - -static int exynos_init(struct hwrng *rng) -{ - struct exynos_rng *exynos_rng = container_of(rng, - struct exynos_rng, rng); - int ret = 0; - - pm_runtime_get_sync(exynos_rng->dev); - ret = exynos_rng_configure(exynos_rng); - pm_runtime_mark_last_busy(exynos_rng->dev); - pm_runtime_put_autosuspend(exynos_rng->dev); - - return ret; -} - -static int exynos_read(struct hwrng *rng, void *buf, - size_t max, bool wait) -{ - struct exynos_rng *exynos_rng = container_of(rng, - struct exynos_rng, rng); - u32 *data = buf; - int retry = 100; - int ret = 4; - - pm_runtime_get_sync(exynos_rng->dev); - - exynos_rng_writel(exynos_rng, PRNG_START, 0); - - while (!(exynos_rng_readl(exynos_rng, - EXYNOS_PRNG_STATUS_OFFSET) & PRNG_DONE) && --retry) - cpu_relax(); - if (!retry) { - ret = -ETIMEDOUT; - goto out; - } - - exynos_rng_writel(exynos_rng, PRNG_DONE, EXYNOS_PRNG_STATUS_OFFSET); - - *data = exynos_rng_readl(exynos_rng, EXYNOS_PRNG_OUT1_OFFSET); - -out: - pm_runtime_mark_last_busy(exynos_rng->dev); - pm_runtime_put_sync_autosuspend(exynos_rng->dev); - - return ret; -} - -static int exynos_rng_probe(struct platform_device *pdev) -{ - struct exynos_rng *exynos_rng; - struct resource *res; - int ret; - - exynos_rng = devm_kzalloc(&pdev->dev, sizeof(struct exynos_rng), - GFP_KERNEL); - if (!exynos_rng) - return -ENOMEM; - - exynos_rng->dev = &pdev->dev; - exynos_rng->rng.name = "exynos"; - exynos_rng->rng.init = exynos_init; - exynos_rng->rng.read = exynos_read; - exynos_rng->clk = devm_clk_get(&pdev->dev, "secss"); - if (IS_ERR(exynos_rng->clk)) { - dev_err(&pdev->dev, "Couldn't get clock.\n"); - return -ENOENT; - } - - res = platform_get_resource(pdev, IORESOURCE_MEM, 0); - exynos_rng->mem = devm_ioremap_resource(&pdev->dev, res); - if (IS_ERR(exynos_rng->mem)) - return PTR_ERR(exynos_rng->mem); - - platform_set_drvdata(pdev, exynos_rng); - - pm_runtime_set_autosuspend_delay(&pdev->dev, EXYNOS_AUTOSUSPEND_DELAY); - pm_runtime_use_autosuspend(&pdev->dev); - pm_runtime_enable(&pdev->dev); - - ret = devm_hwrng_register(&pdev->dev, &exynos_rng->rng); - if (ret) { - pm_runtime_dont_use_autosuspend(&pdev->dev); - pm_runtime_disable(&pdev->dev); - } - - return ret; -} - -static int exynos_rng_remove(struct platform_device *pdev) -{ - pm_runtime_dont_use_autosuspend(&pdev->dev); - pm_runtime_disable(&pdev->dev); - - return 0; -} - -static int __maybe_unused exynos_rng_runtime_suspend(struct device *dev) -{ - struct platform_device *pdev = to_platform_device(dev); - struct exynos_rng *exynos_rng = platform_get_drvdata(pdev); - - clk_disable_unprepare(exynos_rng->clk); - - return 0; -} - -static int __maybe_unused exynos_rng_runtime_resume(struct device *dev) -{ - struct platform_device *pdev = to_platform_device(dev); - struct exynos_rng *exynos_rng = platform_get_drvdata(pdev); - - return clk_prepare_enable(exynos_rng->clk); -} - -static int __maybe_unused exynos_rng_suspend(struct device *dev) -{ - return pm_runtime_force_suspend(dev); -} - -static int __maybe_unused exynos_rng_resume(struct device *dev) -{ - struct platform_device *pdev = to_platform_device(dev); - struct exynos_rng *exynos_rng = platform_get_drvdata(pdev); - int ret; - - ret = pm_runtime_force_resume(dev); - if (ret) - return ret; - - return exynos_rng_configure(exynos_rng); -} - -static const struct dev_pm_ops exynos_rng_pm_ops = { - SET_SYSTEM_SLEEP_PM_OPS(exynos_rng_suspend, exynos_rng_resume) - SET_RUNTIME_PM_OPS(exynos_rng_runtime_suspend, - exynos_rng_runtime_resume, NULL) -}; - -static const struct of_device_id exynos_rng_dt_match[] = { - { - .compatible = "samsung,exynos4-rng", - }, - { }, -}; -MODULE_DEVICE_TABLE(of, exynos_rng_dt_match); - -static struct platform_driver exynos_rng_driver = { - .driver = { - .name = "exynos-rng", - .pm = &exynos_rng_pm_ops, - .of_match_table = exynos_rng_dt_match, - }, - .probe = exynos_rng_probe, - .remove = exynos_rng_remove, -}; - -module_platform_driver(exynos_rng_driver); - -MODULE_DESCRIPTION("EXYNOS 4 H/W Random Number Generator driver"); -MODULE_AUTHOR("Jonghwa Lee <jonghwa3.lee@samsung.com>"); -MODULE_LICENSE("GPL"); |