^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) * sun8i-ce-trng.c - hardware cryptographic offloader for
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4) * Allwinner H3/A64/H5/H2+/H6/R40 SoC
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 5) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 6) * Copyright (C) 2015-2020 Corentin Labbe <clabbe@baylibre.com>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 7) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 8) * This file handle the TRNG
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 9) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 10) * You could find a link for the datasheet in Documentation/arm/sunxi.rst
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 11) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 12) #include "sun8i-ce.h"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 13) #include <linux/dma-mapping.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 14) #include <linux/pm_runtime.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 15) #include <linux/hw_random.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 16) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 17) * Note that according to the algorithm ID, 2 versions of the TRNG exists,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 18) * The first present in H3/H5/R40/A64 and the second present in H6.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 19) * This file adds support for both, but only the second is working
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 20) * reliabily according to rngtest.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 21) **/
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 22)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 23) static int sun8i_ce_trng_read(struct hwrng *rng, void *data, size_t max, bool wait)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 24) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 25) struct sun8i_ce_dev *ce;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 26) dma_addr_t dma_dst;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 27) int err = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 28) int flow = 3;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 29) unsigned int todo;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 30) struct sun8i_ce_flow *chan;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 31) struct ce_task *cet;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 32) u32 common;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 33) void *d;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 34)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 35) ce = container_of(rng, struct sun8i_ce_dev, trng);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 36)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 37) /* round the data length to a multiple of 32*/
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 38) todo = max + 32;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 39) todo -= todo % 32;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 40)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 41) d = kzalloc(todo, GFP_KERNEL | GFP_DMA);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 42) if (!d)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 43) return -ENOMEM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 44)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 45) #ifdef CONFIG_CRYPTO_DEV_SUN8I_CE_DEBUG
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 46) ce->hwrng_stat_req++;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 47) ce->hwrng_stat_bytes += todo;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 48) #endif
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 49)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 50) dma_dst = dma_map_single(ce->dev, d, todo, DMA_FROM_DEVICE);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 51) if (dma_mapping_error(ce->dev, dma_dst)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 52) dev_err(ce->dev, "Cannot DMA MAP DST\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 53) err = -EFAULT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 54) goto err_dst;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 55) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 56)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 57) err = pm_runtime_get_sync(ce->dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 58) if (err < 0) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 59) pm_runtime_put_noidle(ce->dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 60) goto err_pm;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 61) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 62)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 63) mutex_lock(&ce->rnglock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 64) chan = &ce->chanlist[flow];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 65)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 66) cet = &chan->tl[0];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 67) memset(cet, 0, sizeof(struct ce_task));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 68)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 69) cet->t_id = cpu_to_le32(flow);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 70) common = ce->variant->trng | CE_COMM_INT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 71) cet->t_common_ctl = cpu_to_le32(common);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 72)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 73) /* recent CE (H6) need length in bytes, in word otherwise */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 74) if (ce->variant->trng_t_dlen_in_bytes)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 75) cet->t_dlen = cpu_to_le32(todo);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 76) else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 77) cet->t_dlen = cpu_to_le32(todo / 4);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 78)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 79) cet->t_sym_ctl = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 80) cet->t_asym_ctl = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 81)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 82) cet->t_dst[0].addr = cpu_to_le32(dma_dst);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 83) cet->t_dst[0].len = cpu_to_le32(todo / 4);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 84) ce->chanlist[flow].timeout = todo;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 85)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 86) err = sun8i_ce_run_task(ce, 3, "TRNG");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 87) mutex_unlock(&ce->rnglock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 88)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 89) pm_runtime_put(ce->dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 90)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 91) err_pm:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 92) dma_unmap_single(ce->dev, dma_dst, todo, DMA_FROM_DEVICE);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 93)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 94) if (!err) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 95) memcpy(data, d, max);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 96) err = max;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 97) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 98) memzero_explicit(d, todo);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 99) err_dst:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 100) kfree(d);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 101) return err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 102) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 103)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 104) int sun8i_ce_hwrng_register(struct sun8i_ce_dev *ce)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 105) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 106) int ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 107)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 108) if (ce->variant->trng == CE_ID_NOTSUPP) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 109) dev_info(ce->dev, "TRNG not supported\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 110) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 111) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 112) ce->trng.name = "sun8i Crypto Engine TRNG";
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 113) ce->trng.read = sun8i_ce_trng_read;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 114) ce->trng.quality = 1000;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 115)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 116) ret = hwrng_register(&ce->trng);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 117) if (ret)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 118) dev_err(ce->dev, "Fail to register the TRNG\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 119) return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 120) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 121)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 122) void sun8i_ce_hwrng_unregister(struct sun8i_ce_dev *ce)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 123) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 124) if (ce->variant->trng == CE_ID_NOTSUPP)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 125) return;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 126) hwrng_unregister(&ce->trng);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 127) }
Orange Pi5 kernel
Deprecated Linux kernel 5.10.110 for OrangePi 5/5B/5+ boards
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