char/hw_random/ba431-rng.c

47 static inline u32 ba431_trng_read_reg(struct ba431_trng *ba431, u32 reg)
49 	return ioread32(ba431->base + reg);
52 static inline void ba431_trng_write_reg(struct ba431_trng *ba431, u32 reg,
55 	iowrite32(val, ba431->base + reg);
58 static inline enum ba431_state ba431_trng_get_state(struct ba431_trng *ba431)
60 	u32 status = ba431_trng_read_reg(ba431, BA431_REG_STATUS);
65 static int ba431_trng_is_in_error(struct ba431_trng *ba431)
67 	enum ba431_state state = ba431_trng_get_state(ba431);
76 static int ba431_trng_reset(struct ba431_trng *ba431)
81 	ba431_trng_write_reg(ba431, BA431_REG_CTRL, BA431_CTRL_SOFTRESET);
83 	ba431_trng_write_reg(ba431, BA431_REG_CTRL, BA431_CTRL_ENABLE);
86 	if (readx_poll_timeout(ba431_trng_is_in_error, ba431, ret, !ret,
89 		dev_err(ba431->dev, "reset failed (state: %d)\n",
90 			ba431_trng_get_state(ba431));
94 	dev_info(ba431->dev, "reset done\n");
101 	struct ba431_trng *ba431 = container_of(work, struct ba431_trng,
103 	ba431_trng_reset(ba431);
104 	atomic_set(&ba431->reset_pending, 0);
107 static void ba431_trng_schedule_reset(struct ba431_trng *ba431)
109 	if (atomic_cmpxchg(&ba431->reset_pending, 0, 1))
112 	schedule_work(&ba431->reset_work);
117 	struct ba431_trng *ba431 = container_of(rng, struct ba431_trng, rng);
123 		level = ba431_trng_read_reg(ba431, BA431_REG_FIFO_LEVEL);
125 			if (ba431_trng_is_in_error(ba431)) {
126 				ba431_trng_schedule_reset(ba431);
139 			data[n++] = ba431_trng_read_reg(ba431,
144 		if (ba431_trng_is_in_error(ba431)) {
146 			ba431_trng_schedule_reset(ba431);
157 	struct ba431_trng *ba431 = container_of(rng, struct ba431_trng, rng);
159 	ba431_trng_write_reg(ba431, BA431_REG_CTRL, 0);
160 	cancel_work_sync(&ba431->reset_work);
165 	struct ba431_trng *ba431 = container_of(rng, struct ba431_trng, rng);
167 	return ba431_trng_reset(ba431);
172 	struct ba431_trng *ba431;
175 	ba431 = devm_kzalloc(&pdev->dev, sizeof(*ba431), GFP_KERNEL);
176 	if (!ba431)
179 	ba431->dev = &pdev->dev;
181 	ba431->base = devm_platform_ioremap_resource(pdev, 0);
182 	if (IS_ERR(ba431->base))
183 		return PTR_ERR(ba431->base);
185 	atomic_set(&ba431->reset_pending, 0);
186 	INIT_WORK(&ba431->reset_work, ba431_trng_reset_work);
187 	ba431->rng.name = pdev->name;
188 	ba431->rng.init = ba431_trng_init;
189 	ba431->rng.cleanup = ba431_trng_cleanup;
190 	ba431->rng.read = ba431_trng_read;
192 	ret = devm_hwrng_register(&pdev->dev, &ba431->rng);
202 	{ .compatible = "silex-insight,ba431-rng" },
209 		.name = "ba431-rng",