3  * sun8i-ss-prng.c - hardware cryptographic offloader for
8  * This file handle the PRNG found in the SS
12 #include "sun8i-ss.h"
63 	struct sun8i_ss_dev *ss;  in sun8i_ss_prng_generate()  local
72 	ss = algt->ss;  in sun8i_ss_prng_generate()
75 		dev_err(ss->dev, "The PRNG is not seeded\n");  in sun8i_ss_prng_generate()
79 	/* The SS does not give an updated seed, so we need to get a new one.  in sun8i_ss_prng_generate()
90 	flow = sun8i_ss_get_engine_number(ss);  in sun8i_ss_prng_generate()
103 	dma_iv = dma_map_single(ss->dev, ctx->seed, ctx->slen, DMA_TO_DEVICE);  in sun8i_ss_prng_generate()
104 	if (dma_mapping_error(ss->dev, dma_iv)) {  in sun8i_ss_prng_generate()
105 		dev_err(ss->dev, "Cannot DMA MAP IV\n");  in sun8i_ss_prng_generate()
109 	dma_dst = dma_map_single(ss->dev, d, todo, DMA_FROM_DEVICE);  in sun8i_ss_prng_generate()
110 	if (dma_mapping_error(ss->dev, dma_dst)) {  in sun8i_ss_prng_generate()
111 		dev_err(ss->dev, "Cannot DMA MAP DST\n");  in sun8i_ss_prng_generate()
116 	err = pm_runtime_get_sync(ss->dev);  in sun8i_ss_prng_generate()
118 		pm_runtime_put_noidle(ss->dev);  in sun8i_ss_prng_generate()
123 	mutex_lock(&ss->mlock);  in sun8i_ss_prng_generate()
124 	writel(dma_iv, ss->base + SS_IV_ADR_REG);  in sun8i_ss_prng_generate()
126 	writel(dma_iv, ss->base + SS_KEY_ADR_REG);  in sun8i_ss_prng_generate()
127 	writel(dma_dst, ss->base + SS_DST_ADR_REG);  in sun8i_ss_prng_generate()
128 	writel(todo / 4, ss->base + SS_LEN_ADR_REG);  in sun8i_ss_prng_generate()
130 	reinit_completion(&ss->flows[flow].complete);  in sun8i_ss_prng_generate()
131 	ss->flows[flow].status = 0;  in sun8i_ss_prng_generate()
135 	writel(v, ss->base + SS_CTL_REG);  in sun8i_ss_prng_generate()
137 	wait_for_completion_interruptible_timeout(&ss->flows[flow].complete,  in sun8i_ss_prng_generate()
139 	if (ss->flows[flow].status == 0) {  in sun8i_ss_prng_generate()
140 		dev_err(ss->dev, "DMA timeout for PRNG (size=%u)\n", todo);  in sun8i_ss_prng_generate()
155 	mutex_unlock(&ss->mlock);  in sun8i_ss_prng_generate()
157 	pm_runtime_put(ss->dev);  in sun8i_ss_prng_generate()
160 	dma_unmap_single(ss->dev, dma_dst, todo, DMA_FROM_DEVICE);  in sun8i_ss_prng_generate()
162 	dma_unmap_single(ss->dev, dma_iv, ctx->slen, DMA_TO_DEVICE);  in sun8i_ss_prng_generate()