^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1) // SPDX-License-Identifier: GPL-2.0
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3) * Ingenic Random Number Generator driver
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4) * Copyright (c) 2017 PrasannaKumar Muralidharan <prasannatsmkumar@gmail.com>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 5) * Copyright (c) 2020 周琰杰 (Zhou Yanjie) <zhouyanjie@wanyeetech.com>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 6) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 7)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 8) #include <linux/err.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 9) #include <linux/kernel.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 10) #include <linux/hw_random.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 11) #include <linux/io.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 12) #include <linux/iopoll.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 13) #include <linux/module.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 14) #include <linux/of_device.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 15) #include <linux/platform_device.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 16) #include <linux/slab.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 17)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 18) /* RNG register offsets */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 19) #define RNG_REG_ERNG_OFFSET 0x0
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 20) #define RNG_REG_RNG_OFFSET 0x4
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 21)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 22) /* bits within the ERND register */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 23) #define ERNG_READY BIT(31)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 24) #define ERNG_ENABLE BIT(0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 25)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 26) enum ingenic_rng_version {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 27) ID_JZ4780,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 28) ID_X1000,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 29) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 30)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 31) /* Device associated memory */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 32) struct ingenic_rng {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 33) enum ingenic_rng_version version;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 34)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 35) void __iomem *base;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 36) struct hwrng rng;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 37) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 38)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 39) static int ingenic_rng_init(struct hwrng *rng)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 40) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 41) struct ingenic_rng *priv = container_of(rng, struct ingenic_rng, rng);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 42)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 43) writel(ERNG_ENABLE, priv->base + RNG_REG_ERNG_OFFSET);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 44)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 45) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 46) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 47)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 48) static void ingenic_rng_cleanup(struct hwrng *rng)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 49) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 50) struct ingenic_rng *priv = container_of(rng, struct ingenic_rng, rng);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 51)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 52) writel(0, priv->base + RNG_REG_ERNG_OFFSET);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 53) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 54)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 55) static int ingenic_rng_read(struct hwrng *rng, void *buf, size_t max, bool wait)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 56) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 57) struct ingenic_rng *priv = container_of(rng, struct ingenic_rng, rng);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 58) u32 *data = buf;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 59) u32 status;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 60) int ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 61)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 62) if (priv->version >= ID_X1000) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 63) ret = readl_poll_timeout(priv->base + RNG_REG_ERNG_OFFSET, status,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 64) status & ERNG_READY, 10, 1000);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 65) if (ret == -ETIMEDOUT) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 66) pr_err("%s: Wait for RNG data ready timeout\n", __func__);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 67) return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 68) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 69) } else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 70) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 71) * A delay is required so that the current RNG data is not bit shifted
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 72) * version of previous RNG data which could happen if random data is
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 73) * read continuously from this device.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 74) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 75) udelay(20);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 76) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 77)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 78) *data = readl(priv->base + RNG_REG_RNG_OFFSET);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 79)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 80) return 4;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 81) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 82)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 83) static int ingenic_rng_probe(struct platform_device *pdev)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 84) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 85) struct ingenic_rng *priv;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 86) int ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 87)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 88) priv = devm_kzalloc(&pdev->dev, sizeof(*priv), GFP_KERNEL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 89) if (!priv)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 90) return -ENOMEM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 91)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 92) priv->base = devm_platform_ioremap_resource(pdev, 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 93) if (IS_ERR(priv->base)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 94) pr_err("%s: Failed to map RNG registers\n", __func__);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 95) return PTR_ERR(priv->base);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 96) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 97)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 98) priv->version = (enum ingenic_rng_version)of_device_get_match_data(&pdev->dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 99)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 100) priv->rng.name = pdev->name;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 101) priv->rng.init = ingenic_rng_init;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 102) priv->rng.cleanup = ingenic_rng_cleanup;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 103) priv->rng.read = ingenic_rng_read;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 104)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 105) ret = hwrng_register(&priv->rng);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 106) if (ret) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 107) dev_err(&pdev->dev, "Failed to register hwrng\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 108) return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 109) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 110)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 111) platform_set_drvdata(pdev, priv);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 112)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 113) dev_info(&pdev->dev, "Ingenic RNG driver registered\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 114) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 115) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 116)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 117) static int ingenic_rng_remove(struct platform_device *pdev)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 118) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 119) struct ingenic_rng *priv = platform_get_drvdata(pdev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 120)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 121) hwrng_unregister(&priv->rng);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 122)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 123) writel(0, priv->base + RNG_REG_ERNG_OFFSET);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 124)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 125) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 126) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 127)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 128) static const struct of_device_id ingenic_rng_of_match[] = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 129) { .compatible = "ingenic,jz4780-rng", .data = (void *) ID_JZ4780 },
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 130) { .compatible = "ingenic,x1000-rng", .data = (void *) ID_X1000 },
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 131) { /* sentinel */ }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 132) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 133) MODULE_DEVICE_TABLE(of, ingenic_rng_of_match);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 134)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 135) static struct platform_driver ingenic_rng_driver = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 136) .probe = ingenic_rng_probe,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 137) .remove = ingenic_rng_remove,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 138) .driver = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 139) .name = "ingenic-rng",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 140) .of_match_table = ingenic_rng_of_match,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 141) },
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 142) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 143)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 144) module_platform_driver(ingenic_rng_driver);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 145)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 146) MODULE_LICENSE("GPL");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 147) MODULE_AUTHOR("PrasannaKumar Muralidharan <prasannatsmkumar@gmail.com>");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 148) MODULE_AUTHOR("周琰杰 (Zhou Yanjie) <zhouyanjie@wanyeetech.com>");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 149) MODULE_DESCRIPTION("Ingenic Random Number Generator driver");
Orange Pi5 kernel
Deprecated Linux kernel 5.10.110 for OrangePi 5/5B/5+ boards
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