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hwrng: ingenic - Add hardware TRNG for Ingenic X1830
Add X1830 SoC digital true random number generator driver. Tested-by: 周正 (Zhou Zheng) <sernia.zhou@foxmail.com> Co-developed-by: 漆鹏振 (Qi Pengzhen) <aric.pzqi@ingenic.com> Signed-off-by: 漆鹏振 (Qi Pengzhen) <aric.pzqi@ingenic.com> Signed-off-by: 周琰杰 (Zhou Yanjie) <zhouyanjie@wanyeetech.com> Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
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@ -282,6 +282,20 @@ config HW_RANDOM_INGENIC_RNG
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If unsure, say Y.
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config HW_RANDOM_INGENIC_TRNG
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tristate "Ingenic True Random Number Generator support"
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depends on HW_RANDOM
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depends on MACH_X1830
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default HW_RANDOM
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help
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This driver provides kernel-side support for the True Random Number Generator
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hardware found in ingenic X1830 SoC. YSH & ATIL CU1830-Neo uses X1830 SoC.
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To compile this driver as a module, choose M here: the
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module will be called ingenic-trng.
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If unsure, say Y.
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config HW_RANDOM_NOMADIK
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tristate "ST-Ericsson Nomadik Random Number Generator support"
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depends on ARCH_NOMADIK
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@ -24,6 +24,7 @@ obj-$(CONFIG_HW_RANDOM_TX4939) += tx4939-rng.o
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obj-$(CONFIG_HW_RANDOM_MXC_RNGA) += mxc-rnga.o
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obj-$(CONFIG_HW_RANDOM_IMX_RNGC) += imx-rngc.o
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obj-$(CONFIG_HW_RANDOM_INGENIC_RNG) += ingenic-rng.o
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obj-$(CONFIG_HW_RANDOM_INGENIC_TRNG) += ingenic-trng.o
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obj-$(CONFIG_HW_RANDOM_OCTEON) += octeon-rng.o
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obj-$(CONFIG_HW_RANDOM_NOMADIK) += nomadik-rng.o
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obj-$(CONFIG_HW_RANDOM_PSERIES) += pseries-rng.o
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161
drivers/char/hw_random/ingenic-trng.c
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161
drivers/char/hw_random/ingenic-trng.c
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@ -0,0 +1,161 @@
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// SPDX-License-Identifier: GPL-2.0
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/*
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* Ingenic True Random Number Generator driver
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* Copyright (c) 2019 漆鹏振 (Qi Pengzhen) <aric.pzqi@ingenic.com>
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* Copyright (c) 2020 周琰杰 (Zhou Yanjie) <zhouyanjie@wanyeetech.com>
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*/
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#include <linux/clk.h>
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#include <linux/err.h>
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#include <linux/kernel.h>
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#include <linux/hw_random.h>
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#include <linux/io.h>
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#include <linux/iopoll.h>
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#include <linux/module.h>
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#include <linux/of_device.h>
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#include <linux/platform_device.h>
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#include <linux/slab.h>
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/* DTRNG register offsets */
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#define TRNG_REG_CFG_OFFSET 0x00
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#define TRNG_REG_RANDOMNUM_OFFSET 0x04
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#define TRNG_REG_STATUS_OFFSET 0x08
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/* bits within the CFG register */
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#define CFG_RDY_CLR BIT(12)
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#define CFG_INT_MASK BIT(11)
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#define CFG_GEN_EN BIT(0)
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/* bits within the STATUS register */
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#define STATUS_RANDOM_RDY BIT(0)
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struct ingenic_trng {
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void __iomem *base;
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struct clk *clk;
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struct hwrng rng;
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};
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static int ingenic_trng_init(struct hwrng *rng)
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{
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struct ingenic_trng *trng = container_of(rng, struct ingenic_trng, rng);
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unsigned int ctrl;
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ctrl = readl(trng->base + TRNG_REG_CFG_OFFSET);
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ctrl |= CFG_GEN_EN;
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writel(ctrl, trng->base + TRNG_REG_CFG_OFFSET);
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return 0;
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}
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static void ingenic_trng_cleanup(struct hwrng *rng)
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{
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struct ingenic_trng *trng = container_of(rng, struct ingenic_trng, rng);
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unsigned int ctrl;
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ctrl = readl(trng->base + TRNG_REG_CFG_OFFSET);
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ctrl &= ~CFG_GEN_EN;
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writel(ctrl, trng->base + TRNG_REG_CFG_OFFSET);
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}
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static int ingenic_trng_read(struct hwrng *rng, void *buf, size_t max, bool wait)
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{
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struct ingenic_trng *trng = container_of(rng, struct ingenic_trng, rng);
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u32 *data = buf;
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u32 status;
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int ret;
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ret = readl_poll_timeout(trng->base + TRNG_REG_STATUS_OFFSET, status,
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status & STATUS_RANDOM_RDY, 10, 1000);
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if (ret == -ETIMEDOUT) {
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pr_err("%s: Wait for DTRNG data ready timeout\n", __func__);
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return ret;
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}
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*data = readl(trng->base + TRNG_REG_RANDOMNUM_OFFSET);
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return 4;
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}
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static int ingenic_trng_probe(struct platform_device *pdev)
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{
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struct ingenic_trng *trng;
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int ret;
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trng = devm_kzalloc(&pdev->dev, sizeof(*trng), GFP_KERNEL);
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if (!trng)
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return -ENOMEM;
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trng->base = devm_platform_ioremap_resource(pdev, 0);
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if (IS_ERR(trng->base)) {
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pr_err("%s: Failed to map DTRNG registers\n", __func__);
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ret = PTR_ERR(trng->base);
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return PTR_ERR(trng->base);
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}
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trng->clk = devm_clk_get(&pdev->dev, NULL);
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if (IS_ERR(trng->clk)) {
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ret = PTR_ERR(trng->clk);
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pr_crit("%s: Cannot get DTRNG clock\n", __func__);
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return PTR_ERR(trng->clk);
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}
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ret = clk_prepare_enable(trng->clk);
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if (ret) {
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pr_crit("%s: Unable to enable DTRNG clock\n", __func__);
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return ret;
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}
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trng->rng.name = pdev->name;
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trng->rng.init = ingenic_trng_init;
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trng->rng.cleanup = ingenic_trng_cleanup;
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trng->rng.read = ingenic_trng_read;
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ret = hwrng_register(&trng->rng);
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if (ret) {
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dev_err(&pdev->dev, "Failed to register hwrng\n");
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return ret;
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}
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platform_set_drvdata(pdev, trng);
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dev_info(&pdev->dev, "Ingenic DTRNG driver registered\n");
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return 0;
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}
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static int ingenic_trng_remove(struct platform_device *pdev)
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{
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struct ingenic_trng *trng = platform_get_drvdata(pdev);
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unsigned int ctrl;
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hwrng_unregister(&trng->rng);
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ctrl = readl(trng->base + TRNG_REG_CFG_OFFSET);
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ctrl &= ~CFG_GEN_EN;
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writel(ctrl, trng->base + TRNG_REG_CFG_OFFSET);
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clk_disable_unprepare(trng->clk);
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return 0;
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}
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static const struct of_device_id ingenic_trng_of_match[] = {
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{ .compatible = "ingenic,x1830-dtrng" },
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{ /* sentinel */ }
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};
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MODULE_DEVICE_TABLE(of, ingenic_trng_of_match);
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static struct platform_driver ingenic_trng_driver = {
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.probe = ingenic_trng_probe,
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.remove = ingenic_trng_remove,
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.driver = {
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.name = "ingenic-trng",
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.of_match_table = ingenic_trng_of_match,
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},
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};
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module_platform_driver(ingenic_trng_driver);
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MODULE_LICENSE("GPL");
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MODULE_AUTHOR("漆鹏振 (Qi Pengzhen) <aric.pzqi@ingenic.com>");
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MODULE_AUTHOR("周琰杰 (Zhou Yanjie) <zhouyanjie@wanyeetech.com>");
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MODULE_DESCRIPTION("Ingenic True Random Number Generator driver");
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