mirror of
https://github.com/brain-hackers/u-boot-brain
synced 2024-09-28 07:30:26 +09:00
caa4daa2ae
We use 'priv' for private data but often use 'platdata' for platform data. We can't really use 'pdata' since that is ambiguous (it could mean private or platform data). Rename some of the latter variables to end with 'plat' for consistency. Signed-off-by: Simon Glass <sjg@chromium.org>
122 lines
2.2 KiB
C
122 lines
2.2 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
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/*
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* Copyright 2020, Heinrich Schuchardt <xypron.glpk@gmx.de>
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*
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* Driver for Amlogic hardware random number generator
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*/
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#include <common.h>
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#include <clk.h>
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#include <dm.h>
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#include <rng.h>
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#include <asm/io.h>
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struct meson_rng_platdata {
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fdt_addr_t base;
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struct clk clk;
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};
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/**
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* meson_rng_read() - fill buffer with random bytes
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*
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* @buffer: buffer to receive data
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* @size: size of buffer
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*
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* Return: 0
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*/
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static int meson_rng_read(struct udevice *dev, void *data, size_t len)
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{
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struct meson_rng_platdata *pdata = dev_get_platdata(dev);
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char *buffer = (char *)data;
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while (len) {
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u32 rand = readl(pdata->base);
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size_t step;
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if (len >= 4)
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step = 4;
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else
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step = len;
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memcpy(buffer, &rand, step);
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buffer += step;
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len -= step;
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}
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return 0;
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}
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/**
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* meson_rng_probe() - probe rng device
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*
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* @dev: device
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* Return: 0 if ok
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*/
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static int meson_rng_probe(struct udevice *dev)
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{
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struct meson_rng_platdata *pdata = dev_get_platdata(dev);
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int err;
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err = clk_enable(&pdata->clk);
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if (err)
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return err;
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return 0;
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}
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/**
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* meson_rng_remove() - deinitialize rng device
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*
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* @dev: device
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* Return: 0 if ok
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*/
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static int meson_rng_remove(struct udevice *dev)
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{
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struct meson_rng_platdata *pdata = dev_get_platdata(dev);
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return clk_disable(&pdata->clk);
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}
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/**
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* meson_rng_ofdata_to_platdata() - transfer device tree data to plaform data
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*
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* @dev: device
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* Return: 0 if ok
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*/
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static int meson_rng_ofdata_to_platdata(struct udevice *dev)
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{
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struct meson_rng_platdata *pdata = dev_get_platdata(dev);
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int err;
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pdata->base = dev_read_addr(dev);
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if (!pdata->base)
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return -ENODEV;
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/* Get optional "core" clock */
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err = clk_get_by_name(dev, "core", &pdata->clk);
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if (err && err != -ENODATA)
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return err;
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return 0;
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}
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static const struct dm_rng_ops meson_rng_ops = {
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.read = meson_rng_read,
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};
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static const struct udevice_id meson_rng_match[] = {
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{
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.compatible = "amlogic,meson-rng",
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},
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{},
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};
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U_BOOT_DRIVER(meson_rng) = {
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.name = "meson-rng",
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.id = UCLASS_RNG,
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.of_match = meson_rng_match,
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.ops = &meson_rng_ops,
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.probe = meson_rng_probe,
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.remove = meson_rng_remove,
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.plat_auto = sizeof(struct meson_rng_platdata),
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.ofdata_to_platdata = meson_rng_ofdata_to_platdata,
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};
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