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bf4afc53b7
This was done entirely with mindless brute force, using
git grep -l '\<k[vmz]*alloc_objs*(.*, GFP_KERNEL)' |
xargs sed -i 's/\(alloc_objs*(.*\), GFP_KERNEL)/\1)/'
to convert the new alloc_obj() users that had a simple GFP_KERNEL
argument to just drop that argument.
Note that due to the extreme simplicity of the scripting, any slightly
more complex cases spread over multiple lines would not be triggered:
they definitely exist, but this covers the vast bulk of the cases, and
the resulting diff is also then easier to check automatically.
For the same reason the 'flex' versions will be done as a separate
conversion.
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
130 lines
3.0 KiB
C
130 lines
3.0 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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/*
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* Generic PowerPC 44x RNG driver
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*
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* Copyright 2011 IBM Corporation
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*/
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#include <linux/module.h>
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#include <linux/kernel.h>
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#include <linux/interrupt.h>
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#include <linux/platform_device.h>
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#include <linux/hw_random.h>
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#include <linux/delay.h>
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#include <linux/of_address.h>
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#include <linux/of_platform.h>
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#include <linux/io.h>
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#include "crypto4xx_core.h"
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#include "crypto4xx_trng.h"
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#include "crypto4xx_reg_def.h"
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#define PPC4XX_TRNG_CTRL 0x0008
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#define PPC4XX_TRNG_CTRL_DALM 0x20
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#define PPC4XX_TRNG_STAT 0x0004
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#define PPC4XX_TRNG_STAT_B 0x1
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#define PPC4XX_TRNG_DATA 0x0000
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static int ppc4xx_trng_data_present(struct hwrng *rng, int wait)
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{
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struct crypto4xx_device *dev = (void *)rng->priv;
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int busy, i, present = 0;
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for (i = 0; i < 20; i++) {
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busy = (in_le32(dev->trng_base + PPC4XX_TRNG_STAT) &
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PPC4XX_TRNG_STAT_B);
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if (!busy || !wait) {
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present = 1;
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break;
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}
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udelay(10);
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}
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return present;
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}
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static int ppc4xx_trng_data_read(struct hwrng *rng, u32 *data)
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{
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struct crypto4xx_device *dev = (void *)rng->priv;
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*data = in_le32(dev->trng_base + PPC4XX_TRNG_DATA);
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return 4;
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}
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static void ppc4xx_trng_enable(struct crypto4xx_device *dev, bool enable)
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{
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u32 device_ctrl;
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device_ctrl = readl(dev->ce_base + CRYPTO4XX_DEVICE_CTRL);
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if (enable)
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device_ctrl |= PPC4XX_TRNG_EN;
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else
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device_ctrl &= ~PPC4XX_TRNG_EN;
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writel(device_ctrl, dev->ce_base + CRYPTO4XX_DEVICE_CTRL);
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}
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static const struct of_device_id ppc4xx_trng_match[] = {
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{ .compatible = "ppc4xx-rng", },
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{ .compatible = "amcc,ppc460ex-rng", },
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{ .compatible = "amcc,ppc440epx-rng", },
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{},
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};
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void ppc4xx_trng_probe(struct crypto4xx_core_device *core_dev)
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{
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struct crypto4xx_device *dev = core_dev->dev;
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struct device_node *trng = NULL;
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struct hwrng *rng = NULL;
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int err;
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/* Find the TRNG device node and map it */
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trng = of_find_matching_node(NULL, ppc4xx_trng_match);
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if (!trng || !of_device_is_available(trng)) {
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of_node_put(trng);
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return;
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}
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dev->trng_base = of_iomap(trng, 0);
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of_node_put(trng);
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if (!dev->trng_base)
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goto err_out;
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rng = kzalloc_obj(*rng);
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if (!rng)
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goto err_out;
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rng->name = KBUILD_MODNAME;
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rng->data_present = ppc4xx_trng_data_present;
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rng->data_read = ppc4xx_trng_data_read;
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rng->priv = (unsigned long) dev;
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core_dev->trng = rng;
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ppc4xx_trng_enable(dev, true);
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out_le32(dev->trng_base + PPC4XX_TRNG_CTRL, PPC4XX_TRNG_CTRL_DALM);
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err = devm_hwrng_register(core_dev->device, core_dev->trng);
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if (err) {
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ppc4xx_trng_enable(dev, false);
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dev_err(core_dev->device, "failed to register hwrng (%d).\n",
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err);
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goto err_out;
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}
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return;
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err_out:
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iounmap(dev->trng_base);
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kfree(rng);
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dev->trng_base = NULL;
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core_dev->trng = NULL;
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}
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void ppc4xx_trng_remove(struct crypto4xx_core_device *core_dev)
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{
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if (core_dev && core_dev->trng) {
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struct crypto4xx_device *dev = core_dev->dev;
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devm_hwrng_unregister(core_dev->device, core_dev->trng);
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ppc4xx_trng_enable(dev, false);
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iounmap(dev->trng_base);
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kfree(core_dev->trng);
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}
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}
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MODULE_ALIAS("ppc4xx_rng");
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