1 // SPDX-License-Identifier: GPL-2.0+
6  * Copyright (C) 2014 Maxime Ripard <maxime.ripard@free-electrons.com>
13 #include <linux/nvmem-provider.h>
20 /* Registers and special values for doing register-based SID readout on H3 */
43 	struct sunxi_sid *sid = context;  in sunxi_sid_read()  local
45 	memcpy_fromio(val, sid->base + sid->value_offset + offset, bytes);  in sunxi_sid_read()
50 static int sun8i_sid_register_readout(const struct sunxi_sid *sid,  in sun8i_sid_register_readout()  argument
61 	writel(reg_val, sid->base + SUN8I_SID_PRCTL);  in sun8i_sid_register_readout()
63 	ret = readl_poll_timeout(sid->base + SUN8I_SID_PRCTL, reg_val,  in sun8i_sid_register_readout()
69 		*out = readl(sid->base + SUN8I_SID_RDKEY);  in sun8i_sid_register_readout()
71 	writel(0, sid->base + SUN8I_SID_PRCTL);  in sun8i_sid_register_readout()
77  * On Allwinner H3, the value on the 0x200 offset of the SID controller seems
84 	struct sunxi_sid *sid = context;  in sun8i_sid_read_by_reg()  local
90 		ret = sun8i_sid_register_readout(sid, offset, val);  in sun8i_sid_read_by_reg()
96 		bytes -= 4;  in sun8i_sid_read_by_reg()
103 	ret = sun8i_sid_register_readout(sid, offset, &word);  in sun8i_sid_read_by_reg()
114 	struct device *dev = &pdev->dev;  in sunxi_sid_probe()
118 	struct sunxi_sid *sid;  in sunxi_sid_probe()  local
123 	sid = devm_kzalloc(dev, sizeof(*sid), GFP_KERNEL);  in sunxi_sid_probe()
124 	if (!sid)  in sunxi_sid_probe()
125 		return -ENOMEM;  in sunxi_sid_probe()
129 		return -EINVAL;  in sunxi_sid_probe()
130 	sid->value_offset = cfg->value_offset;  in sunxi_sid_probe()
133 	sid->base = devm_ioremap_resource(dev, res);  in sunxi_sid_probe()
134 	if (IS_ERR(sid->base))  in sunxi_sid_probe()
135 		return PTR_ERR(sid->base);  in sunxi_sid_probe()
137 	size = cfg->size;  in sunxi_sid_probe()
141 		return -ENOMEM;  in sunxi_sid_probe()
143 	nvmem_cfg->dev = dev;  in sunxi_sid_probe()
144 	nvmem_cfg->name = "sunxi-sid";  in sunxi_sid_probe()
145 	nvmem_cfg->read_only = true;  in sunxi_sid_probe()
146 	nvmem_cfg->size = cfg->size;  in sunxi_sid_probe()
147 	nvmem_cfg->word_size = 1;  in sunxi_sid_probe()
148 	nvmem_cfg->stride = 4;  in sunxi_sid_probe()
149 	nvmem_cfg->priv = sid;  in sunxi_sid_probe()
150 	if (cfg->need_register_readout)  in sunxi_sid_probe()
151 		nvmem_cfg->reg_read = sun8i_sid_read_by_reg;  in sunxi_sid_probe()
153 		nvmem_cfg->reg_read = sunxi_sid_read;  in sunxi_sid_probe()
161 		return -ENOMEM;  in sunxi_sid_probe()
163 	nvmem_cfg->reg_read(sid, 0, randomness, size);  in sunxi_sid_probe()
198 	{ .compatible = "allwinner,sun4i-a10-sid", .data = &sun4i_a10_cfg },
199 	{ .compatible = "allwinner,sun7i-a20-sid", .data = &sun7i_a20_cfg },
200 	{ .compatible = "allwinner,sun8i-a83t-sid", .data = &sun50i_a64_cfg },
201 	{ .compatible = "allwinner,sun8i-h3-sid", .data = &sun8i_h3_cfg },
202 	{ .compatible = "allwinner,sun50i-a64-sid", .data = &sun50i_a64_cfg },
203 	{ .compatible = "allwinner,sun50i-h5-sid", .data = &sun50i_a64_cfg },
204 	{ .compatible = "allwinner,sun50i-h6-sid", .data = &sun50i_h6_cfg },
212 		.name = "eeprom-sunxi-sid",