char/hw_random/jh7110-trng.c

3  * TRNG driver for the StarFive JH7110 SoC
24 /* trng register offset */
123 static inline int starfive_trng_wait_idle(struct starfive_trng *trng)
127 	return readl_relaxed_poll_timeout(trng->base + STARFIVE_STAT, stat,
133 static inline void starfive_trng_irq_mask_clear(struct starfive_trng *trng)
136 	u32 data = readl(trng->base + STARFIVE_ISTAT);
138 	writel(data, trng->base + STARFIVE_ISTAT);
141 static int starfive_trng_cmd(struct starfive_trng *trng, u32 cmd, bool wait)
151 		reinit_completion(&trng->random_done);
152 		spin_lock_irq(&trng->write_lock);
153 		writel(cmd, trng->base + STARFIVE_CTRL);
154 		spin_unlock_irq(&trng->write_lock);
155 		if (!wait_for_completion_timeout(&trng->random_done, usecs_to_jiffies(wait_time)))
159 		reinit_completion(&trng->reseed_done);
160 		spin_lock_irq(&trng->write_lock);
161 		writel(cmd, trng->base + STARFIVE_CTRL);
162 		spin_unlock_irq(&trng->write_lock);
163 		if (!wait_for_completion_timeout(&trng->reseed_done, usecs_to_jiffies(wait_time)))
175 	struct starfive_trng *trng = to_trng(rng);
179 	writel(autoage, trng->base + STARFIVE_AUTO_AGE);
180 	writel(autoreq, trng->base + STARFIVE_AUTO_RQSTS);
183 	starfive_trng_irq_mask_clear(trng);
186 	writel(intr, trng->base + STARFIVE_IE);
188 	mode  = readl(trng->base + STARFIVE_MODE);
190 	switch (trng->mode) {
202 	writel(mode, trng->base + STARFIVE_MODE);
204 	return starfive_trng_cmd(trng, STARFIVE_CTRL_EXEC_RANDRESEED, 1);
210 	struct starfive_trng *trng = (struct starfive_trng *)priv;
212 	status = readl(trng->base + STARFIVE_ISTAT);
214 		writel(STARFIVE_ISTAT_RAND_RDY, trng->base + STARFIVE_ISTAT);
215 		complete(&trng->random_done);
219 		writel(STARFIVE_ISTAT_SEED_DONE, trng->base + STARFIVE_ISTAT);
220 		complete(&trng->reseed_done);
224 		writel(STARFIVE_ISTAT_LFSR_LOCKUP, trng->base + STARFIVE_ISTAT);
226 		spin_lock(&trng->write_lock);
227 		writel(STARFIVE_CTRL_EXEC_RANDRESEED, trng->base + STARFIVE_CTRL);
228 		spin_unlock(&trng->write_lock);
236 	struct starfive_trng *trng = to_trng(rng);
238 	writel(0, trng->base + STARFIVE_CTRL);
240 	reset_control_assert(trng->rst);
241 	clk_disable_unprepare(trng->hclk);
242 	clk_disable_unprepare(trng->ahb);
247 	struct starfive_trng *trng = to_trng(rng);
250 	pm_runtime_get_sync(trng->dev);
252 	if (trng->mode == PRNG_256BIT)
258 		ret = starfive_trng_wait_idle(trng);
263 	ret = starfive_trng_cmd(trng, STARFIVE_CTRL_GENE_RANDNUM, wait);
267 	memcpy_fromio(buf, trng->base + STARFIVE_RAND0, max);
269 	pm_runtime_put_sync_autosuspend(trng->dev);
278 	struct starfive_trng *trng;
280 	trng = devm_kzalloc(&pdev->dev, sizeof(*trng), GFP_KERNEL);
281 	if (!trng)
284 	platform_set_drvdata(pdev, trng);
285 	trng->dev = &pdev->dev;
287 	trng->base = devm_platform_ioremap_resource(pdev, 0);
288 	if (IS_ERR(trng->base))
289 		return dev_err_probe(&pdev->dev, PTR_ERR(trng->base),
296 	init_completion(&trng->random_done);
297 	init_completion(&trng->reseed_done);
298 	spin_lock_init(&trng->write_lock);
301 			       (void *)trng);
306 	trng->hclk = devm_clk_get(&pdev->dev, "hclk");
307 	if (IS_ERR(trng->hclk))
308 		return dev_err_probe(&pdev->dev, PTR_ERR(trng->hclk),
311 	trng->ahb = devm_clk_get(&pdev->dev, "ahb");
312 	if (IS_ERR(trng->ahb))
313 		return dev_err_probe(&pdev->dev, PTR_ERR(trng->ahb),
316 	trng->rst = devm_reset_control_get_shared(&pdev->dev, NULL);
317 	if (IS_ERR(trng->rst))
318 		return dev_err_probe(&pdev->dev, PTR_ERR(trng->rst),
321 	clk_prepare_enable(trng->hclk);
322 	clk_prepare_enable(trng->ahb);
323 	reset_control_deassert(trng->rst);
325 	trng->rng.name = dev_driver_string(&pdev->dev);
326 	trng->rng.init = starfive_trng_init;
327 	trng->rng.cleanup = starfive_trng_cleanup;
328 	trng->rng.read = starfive_trng_read;
330 	trng->mode = PRNG_256BIT;
331 	trng->mission = 1;
332 	trng->reseed = RANDOM_RESEED;
338 	ret = devm_hwrng_register(&pdev->dev, &trng->rng);
342 		reset_control_assert(trng->rst);
343 		clk_disable_unprepare(trng->ahb);
344 		clk_disable_unprepare(trng->hclk);
354 	struct starfive_trng *trng = dev_get_drvdata(dev);
356 	clk_disable_unprepare(trng->hclk);
357 	clk_disable_unprepare(trng->ahb);
364 	struct starfive_trng *trng = dev_get_drvdata(dev);
366 	clk_prepare_enable(trng->hclk);
367 	clk_prepare_enable(trng->ahb);
380 	{ .compatible = "starfive,jh7110-trng" },
388 		.name		= "jh7110-trng",