mirror of
https://github.com/AuxXxilium/linux_dsm_epyc7002.git
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553072b27e
Signed-off-by: Florian Fainelli <florian@openwrt.org> Cc: linux-mips@linux-mips.org Cc: mpm@selenic.com Cc: herbert@gondor.apana.org.au Patchwork: https://patchwork.linux-mips.org/patch/3327/ Patchwork: https://patchwork.linux-mips.org/patch/4072/ Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
176 lines
3.7 KiB
C
176 lines
3.7 KiB
C
/*
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* Broadcom BCM63xx Random Number Generator support
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*
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* Copyright (C) 2011, Florian Fainelli <florian@openwrt.org>
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* Copyright (C) 2009, Broadcom Corporation
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*
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*/
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#include <linux/module.h>
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#include <linux/slab.h>
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#include <linux/io.h>
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#include <linux/err.h>
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#include <linux/clk.h>
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#include <linux/platform_device.h>
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#include <linux/hw_random.h>
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#include <bcm63xx_io.h>
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#include <bcm63xx_regs.h>
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struct bcm63xx_rng_priv {
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struct clk *clk;
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void __iomem *regs;
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};
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#define to_rng_priv(rng) ((struct bcm63xx_rng_priv *)rng->priv)
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static int bcm63xx_rng_init(struct hwrng *rng)
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{
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struct bcm63xx_rng_priv *priv = to_rng_priv(rng);
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u32 val;
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val = bcm_readl(priv->regs + RNG_CTRL);
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val |= RNG_EN;
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bcm_writel(val, priv->regs + RNG_CTRL);
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return 0;
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}
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static void bcm63xx_rng_cleanup(struct hwrng *rng)
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{
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struct bcm63xx_rng_priv *priv = to_rng_priv(rng);
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u32 val;
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val = bcm_readl(priv->regs + RNG_CTRL);
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val &= ~RNG_EN;
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bcm_writel(val, priv->regs + RNG_CTRL);
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}
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static int bcm63xx_rng_data_present(struct hwrng *rng, int wait)
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{
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struct bcm63xx_rng_priv *priv = to_rng_priv(rng);
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return bcm_readl(priv->regs + RNG_STAT) & RNG_AVAIL_MASK;
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}
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static int bcm63xx_rng_data_read(struct hwrng *rng, u32 *data)
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{
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struct bcm63xx_rng_priv *priv = to_rng_priv(rng);
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*data = bcm_readl(priv->regs + RNG_DATA);
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return 4;
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}
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static int __devinit bcm63xx_rng_probe(struct platform_device *pdev)
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{
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struct resource *r;
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struct clk *clk;
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int ret;
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struct bcm63xx_rng_priv *priv;
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struct hwrng *rng;
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r = platform_get_resource(pdev, IORESOURCE_MEM, 0);
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if (!r) {
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dev_err(&pdev->dev, "no iomem resource\n");
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ret = -ENXIO;
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goto out;
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}
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priv = kzalloc(sizeof(*priv), GFP_KERNEL);
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if (!priv) {
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dev_err(&pdev->dev, "no memory for private structure\n");
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ret = -ENOMEM;
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goto out;
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}
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rng = kzalloc(sizeof(*rng), GFP_KERNEL);
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if (!rng) {
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dev_err(&pdev->dev, "no memory for rng structure\n");
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ret = -ENOMEM;
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goto out_free_priv;
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}
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platform_set_drvdata(pdev, rng);
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rng->priv = (unsigned long)priv;
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rng->name = pdev->name;
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rng->init = bcm63xx_rng_init;
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rng->cleanup = bcm63xx_rng_cleanup;
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rng->data_present = bcm63xx_rng_data_present;
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rng->data_read = bcm63xx_rng_data_read;
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clk = clk_get(&pdev->dev, "ipsec");
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if (IS_ERR(clk)) {
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dev_err(&pdev->dev, "no clock for device\n");
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ret = PTR_ERR(clk);
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goto out_free_rng;
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}
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priv->clk = clk;
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if (!devm_request_mem_region(&pdev->dev, r->start,
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resource_size(r), pdev->name)) {
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dev_err(&pdev->dev, "request mem failed");
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ret = -ENOMEM;
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goto out_free_rng;
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}
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priv->regs = devm_ioremap_nocache(&pdev->dev, r->start,
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resource_size(r));
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if (!priv->regs) {
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dev_err(&pdev->dev, "ioremap failed");
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ret = -ENOMEM;
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goto out_free_rng;
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}
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clk_enable(clk);
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ret = hwrng_register(rng);
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if (ret) {
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dev_err(&pdev->dev, "failed to register rng device\n");
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goto out_clk_disable;
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}
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dev_info(&pdev->dev, "registered RNG driver\n");
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return 0;
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out_clk_disable:
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clk_disable(clk);
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out_free_rng:
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platform_set_drvdata(pdev, NULL);
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kfree(rng);
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out_free_priv:
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kfree(priv);
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out:
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return ret;
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}
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static int __devexit bcm63xx_rng_remove(struct platform_device *pdev)
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{
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struct hwrng *rng = platform_get_drvdata(pdev);
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struct bcm63xx_rng_priv *priv = to_rng_priv(rng);
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hwrng_unregister(rng);
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clk_disable(priv->clk);
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kfree(priv);
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kfree(rng);
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platform_set_drvdata(pdev, NULL);
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return 0;
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}
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static struct platform_driver bcm63xx_rng_driver = {
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.probe = bcm63xx_rng_probe,
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.remove = __devexit_p(bcm63xx_rng_remove),
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.driver = {
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.name = "bcm63xx-rng",
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.owner = THIS_MODULE,
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},
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};
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module_platform_driver(bcm63xx_rng_driver);
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MODULE_AUTHOR("Florian Fainelli <florian@openwrt.org>");
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MODULE_DESCRIPTION("Broadcom BCM63xx RNG driver");
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MODULE_LICENSE("GPL");
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