1 // SPDX-License-Identifier: GPL-2.0
3  * sun8i-ce-prng.c - hardware cryptographic offloader for
6  * Copyright (C) 2015-2020 Corentin Labbe <clabbe@baylibre.com>
12 #include "sun8i-ce.h"
13 #include <linux/dma-mapping.h>
29 	memzero_explicit(ctx->seed, ctx->slen);  in sun8i_ce_prng_exit()
30 	kfree(ctx->seed);  in sun8i_ce_prng_exit()
31 	ctx->seed = NULL;  in sun8i_ce_prng_exit()
32 	ctx->slen = 0;  in sun8i_ce_prng_exit()
40 	if (ctx->seed && ctx->slen != slen) {  in sun8i_ce_prng_seed()
41 		memzero_explicit(ctx->seed, ctx->slen);  in sun8i_ce_prng_seed()
42 		kfree(ctx->seed);  in sun8i_ce_prng_seed()
43 		ctx->slen = 0;  in sun8i_ce_prng_seed()
44 		ctx->seed = NULL;  in sun8i_ce_prng_seed()
46 	if (!ctx->seed)  in sun8i_ce_prng_seed()
47 		ctx->seed = kmalloc(slen, GFP_KERNEL | GFP_DMA);  in sun8i_ce_prng_seed()
48 	if (!ctx->seed)  in sun8i_ce_prng_seed()
49 		return -ENOMEM;  in sun8i_ce_prng_seed()
51 	memcpy(ctx->seed, seed, slen);  in sun8i_ce_prng_seed()
52 	ctx->slen = slen;  in sun8i_ce_prng_seed()
74 	ce = algt->ce;  in sun8i_ce_prng_generate()
76 	if (ctx->slen == 0) {  in sun8i_ce_prng_generate()
77 		dev_err(ce->dev, "not seeded\n");  in sun8i_ce_prng_generate()
78 		return -EINVAL;  in sun8i_ce_prng_generate()
82 	todo = dlen + ctx->slen + PRNG_DATA_SIZE * 2;  in sun8i_ce_prng_generate()
83 	todo -= todo % PRNG_DATA_SIZE;  in sun8i_ce_prng_generate()
87 		err = -ENOMEM;  in sun8i_ce_prng_generate()
91 	dev_dbg(ce->dev, "%s PRNG slen=%u dlen=%u todo=%u multi=%u\n", __func__,  in sun8i_ce_prng_generate()
95 	algt->stat_req++;  in sun8i_ce_prng_generate()
96 	algt->stat_bytes += todo;  in sun8i_ce_prng_generate()
99 	dma_iv = dma_map_single(ce->dev, ctx->seed, ctx->slen, DMA_TO_DEVICE);  in sun8i_ce_prng_generate()
100 	if (dma_mapping_error(ce->dev, dma_iv)) {  in sun8i_ce_prng_generate()
101 		dev_err(ce->dev, "Cannot DMA MAP IV\n");  in sun8i_ce_prng_generate()
105 	dma_dst = dma_map_single(ce->dev, d, todo, DMA_FROM_DEVICE);  in sun8i_ce_prng_generate()
106 	if (dma_mapping_error(ce->dev, dma_dst)) {  in sun8i_ce_prng_generate()
107 		dev_err(ce->dev, "Cannot DMA MAP DST\n");  in sun8i_ce_prng_generate()
108 		err = -EFAULT;  in sun8i_ce_prng_generate()
112 	err = pm_runtime_get_sync(ce->dev);  in sun8i_ce_prng_generate()
114 		pm_runtime_put_noidle(ce->dev);  in sun8i_ce_prng_generate()
118 	mutex_lock(&ce->rnglock);  in sun8i_ce_prng_generate()
119 	chan = &ce->chanlist[flow];  in sun8i_ce_prng_generate()
121 	cet = &chan->tl[0];  in sun8i_ce_prng_generate()
124 	cet->t_id = cpu_to_le32(flow);  in sun8i_ce_prng_generate()
125 	common = ce->variant->prng | CE_COMM_INT;  in sun8i_ce_prng_generate()
126 	cet->t_common_ctl = cpu_to_le32(common);  in sun8i_ce_prng_generate()
128 	/* recent CE (H6) need length in bytes, in word otherwise */  in sun8i_ce_prng_generate()
129 	if (ce->variant->prng_t_dlen_in_bytes)  in sun8i_ce_prng_generate()
130 		cet->t_dlen = cpu_to_le32(todo);  in sun8i_ce_prng_generate()
132 		cet->t_dlen = cpu_to_le32(todo / 4);  in sun8i_ce_prng_generate()
135 	cet->t_sym_ctl = cpu_to_le32(sym);  in sun8i_ce_prng_generate()
136 	cet->t_asym_ctl = 0;  in sun8i_ce_prng_generate()
138 	cet->t_key = cpu_to_le32(dma_iv);  in sun8i_ce_prng_generate()
139 	cet->t_iv = cpu_to_le32(dma_iv);  in sun8i_ce_prng_generate()
141 	cet->t_dst[0].addr = cpu_to_le32(dma_dst);  in sun8i_ce_prng_generate()
142 	cet->t_dst[0].len = cpu_to_le32(todo / 4);  in sun8i_ce_prng_generate()
143 	ce->chanlist[flow].timeout = 2000;  in sun8i_ce_prng_generate()
146 	mutex_unlock(&ce->rnglock);  in sun8i_ce_prng_generate()
148 	pm_runtime_put(ce->dev);  in sun8i_ce_prng_generate()
151 	dma_unmap_single(ce->dev, dma_dst, todo, DMA_FROM_DEVICE);  in sun8i_ce_prng_generate()
153 	dma_unmap_single(ce->dev, dma_iv, ctx->slen, DMA_TO_DEVICE);  in sun8i_ce_prng_generate()
157 		memcpy(ctx->seed, d + dlen, ctx->slen);  in sun8i_ce_prng_generate()