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2023-12-09 b22da3d8526a935aa31e086e63f60ff3246cb61c

 kernel/drivers/char/hw_random/ks-sa-rng.c
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@@ -1,19 +1,11 @@
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+// SPDX-License-Identifier: GPL-2.0-only
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 /*
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  * Random Number Generator driver for the Keystone SOC
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  *
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- * Copyright (C) 2016 Texas Instruments Incorporated - http://www.ti.com
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+ * Copyright (C) 2016 Texas Instruments Incorporated - https://www.ti.com
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  *
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  * Authors:	Sandeep Nair
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  *		Vitaly Andrianov
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- *
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- * This program is free software; you can redistribute it and/or
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- * modify it under the terms of the GNU General Public License
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- * version 2 as published by the Free Software Foundation.
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- *
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- * This program is distributed in the hope that it will be useful, but
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- * WITHOUT ANY WARRANTY; without even the implied warranty of
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- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
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- * General Public License for more details.
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  */
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10
 
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 #include <linux/hw_random.h>
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@@ -29,6 +21,7 @@
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 #include <linux/of.h>
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 #include <linux/of_address.h>
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 #include <linux/delay.h>
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+#include <linux/timekeeping.h>
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25
 
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 #define SA_CMD_STATUS_OFS			0x8
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27
 
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@@ -92,14 +85,37 @@
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 	struct hwrng	rng;
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 	struct clk	*clk;
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 	struct regmap	*regmap_cfg;
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-	struct trng_regs *reg_rng;
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+	struct trng_regs __iomem *reg_rng;
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+	u64 ready_ts;
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+	unsigned int refill_delay_ns;
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 };
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+
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+static unsigned int cycles_to_ns(unsigned long clk_rate, unsigned int cycles)
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+{
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+	return DIV_ROUND_UP_ULL((TRNG_DEF_CLK_DIV_CYCLES + 1) * 1000000000ull *
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+				cycles, clk_rate);
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+}
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+
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+static unsigned int startup_delay_ns(unsigned long clk_rate)
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+{
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+	if (!TRNG_DEF_STARTUP_CYCLES)
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+		return cycles_to_ns(clk_rate, BIT(24));
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+	return cycles_to_ns(clk_rate, 256 * TRNG_DEF_STARTUP_CYCLES);
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+}
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+
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+static unsigned int refill_delay_ns(unsigned long clk_rate)
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+{
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+	if (!TRNG_DEF_MAX_REFILL_CYCLES)
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+		return cycles_to_ns(clk_rate, BIT(24));
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+	return cycles_to_ns(clk_rate, 256 * TRNG_DEF_MAX_REFILL_CYCLES);
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+}
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 static int ks_sa_rng_init(struct hwrng *rng)
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 {
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 	u32 value;
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 	struct device *dev = (struct device *)rng->priv;
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 	struct ks_sa_rng *ks_sa_rng = dev_get_drvdata(dev);
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+	unsigned long clk_rate = clk_get_rate(ks_sa_rng->clk);
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 	/* Enable RNG module */
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 	regmap_write_bits(ks_sa_rng->regmap_cfg, SA_CMD_STATUS_OFS,
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@@ -128,6 +144,10 @@
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 	value |= TRNG_CNTL_REG_TRNG_ENABLE;
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 	writel(value, &ks_sa_rng->reg_rng->control);
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+	ks_sa_rng->refill_delay_ns = refill_delay_ns(clk_rate);
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+	ks_sa_rng->ready_ts = ktime_get_ns() +
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+			      startup_delay_ns(clk_rate);
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+
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 	return 0;
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 }
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@@ -152,6 +172,7 @@
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 	data[1] = readl(&ks_sa_rng->reg_rng->output_h);
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 	writel(TRNG_INTACK_REG_READY, &ks_sa_rng->reg_rng->intack);
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+	ks_sa_rng->ready_ts = ktime_get_ns() + ks_sa_rng->refill_delay_ns;
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 	return sizeof(u32) * 2;
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 }
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@@ -160,9 +181,18 @@
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 {
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 	struct device *dev = (struct device *)rng->priv;
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 	struct ks_sa_rng *ks_sa_rng = dev_get_drvdata(dev);
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+	u64 now = ktime_get_ns();
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 	u32	ready;
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 	int	j;
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+
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+	if (wait && now < ks_sa_rng->ready_ts) {
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+		/* Max delay expected here is 81920000 ns */
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+		unsigned long min_delay =
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+			DIV_ROUND_UP((u32)(ks_sa_rng->ready_ts - now), 1000);
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+
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+		usleep_range(min_delay, min_delay + SA_RNG_DATA_RETRY_DELAY);
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+	}
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 	for (j = 0; j < SA_MAX_RNG_DATA_RETRIES; j++) {
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 		ready = readl(&ks_sa_rng->reg_rng->status);
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@@ -182,7 +212,6 @@
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 	struct ks_sa_rng	*ks_sa_rng;
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 	struct device		*dev = &pdev->dev;
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 	int			ret;
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-	struct resource		*mem;
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 	ks_sa_rng = devm_kzalloc(dev, sizeof(*ks_sa_rng), GFP_KERNEL);
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 	if (!ks_sa_rng)
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@@ -198,8 +227,7 @@
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 	};
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 	ks_sa_rng->rng.priv = (unsigned long)dev;
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-	mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
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-	ks_sa_rng->reg_rng = devm_ioremap_resource(dev, mem);
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+	ks_sa_rng->reg_rng = devm_platform_ioremap_resource(pdev, 0);
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 	if (IS_ERR(ks_sa_rng->reg_rng))
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 		return PTR_ERR(ks_sa_rng->reg_rng);
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