5  * Copyright (C) 2014 Maxime Ripard <maxime.ripard@free-electrons.com>
22 #include <linux/nvmem-provider.h>
29 /* Registers and special values for doing register-based SID readout on H3 */
39 	.name = "sunxi-sid",
58  * uses 4 times more reads as needed but keeps code simpler. Since the SID is
61 static u8 sunxi_sid_read_byte(const struct sunxi_sid *sid,  in sunxi_sid_read_byte()  argument
66 	sid_key = ioread32be(sid->base + round_down(offset, 4));  in sunxi_sid_read_byte()
75 	struct sunxi_sid *sid = context;  in sunxi_sid_read()  local
78 	/* Offset the read operation to the real position of SID */  in sunxi_sid_read()
79 	offset += sid->value_offset;  in sunxi_sid_read()
81 	while (bytes--)  in sunxi_sid_read()
82 		*buf++ = sunxi_sid_read_byte(sid, offset++);  in sunxi_sid_read()
87 static int sun8i_sid_register_readout(const struct sunxi_sid *sid,  in sun8i_sid_register_readout()  argument
98 	writel(reg_val, sid->base + SUN8I_SID_PRCTL);  in sun8i_sid_register_readout()
100 	ret = readl_poll_timeout(sid->base + SUN8I_SID_PRCTL, reg_val,  in sun8i_sid_register_readout()
106 		*out = readl(sid->base + SUN8I_SID_RDKEY);  in sun8i_sid_register_readout()
108 	writel(0, sid->base + SUN8I_SID_PRCTL);  in sun8i_sid_register_readout()
114  * On Allwinner H3, the value on the 0x200 offset of the SID controller seems
118 static int sun8i_sid_read_byte_by_reg(const struct sunxi_sid *sid,  in sun8i_sid_read_byte_by_reg()  argument
125 	ret = sun8i_sid_register_readout(sid, offset & ~0x03, &word);  in sun8i_sid_read_byte_by_reg()
138 	struct sunxi_sid *sid = context;  in sun8i_sid_read_by_reg()  local
142 	while (bytes--) {  in sun8i_sid_read_by_reg()
143 		ret = sun8i_sid_read_byte_by_reg(sid, offset++, buf++);  in sun8i_sid_read_by_reg()
153 	struct device *dev = &pdev->dev;  in sunxi_sid_probe()
156 	struct sunxi_sid *sid;  in sunxi_sid_probe()  local
161 	sid = devm_kzalloc(dev, sizeof(*sid), GFP_KERNEL);  in sunxi_sid_probe()
162 	if (!sid)  in sunxi_sid_probe()
163 		return -ENOMEM;  in sunxi_sid_probe()
167 		return -EINVAL;  in sunxi_sid_probe()
168 	sid->value_offset = cfg->value_offset;  in sunxi_sid_probe()
171 	sid->base = devm_ioremap_resource(dev, res);  in sunxi_sid_probe()
172 	if (IS_ERR(sid->base))  in sunxi_sid_probe()
173 		return PTR_ERR(sid->base);  in sunxi_sid_probe()
175 	size = cfg->size;  in sunxi_sid_probe()
179 	if (cfg->need_register_readout)  in sunxi_sid_probe()
183 	econfig.priv = sid;  in sunxi_sid_probe()
190 		ret = -EINVAL;  in sunxi_sid_probe()
195 		econfig.reg_read(sid, i, &randomness[i], 1);  in sunxi_sid_probe()
236 	{ .compatible = "allwinner,sun4i-a10-sid", .data = &sun4i_a10_cfg },
237 	{ .compatible = "allwinner,sun7i-a20-sid", .data = &sun7i_a20_cfg },
238 	{ .compatible = "allwinner,sun8i-a83t-sid", .data = &sun50i_a64_cfg },
239 	{ .compatible = "allwinner,sun8i-h3-sid", .data = &sun8i_h3_cfg },
240 	{ .compatible = "allwinner,sun50i-a64-sid", .data = &sun50i_a64_cfg },
241 	{ .compatible = "allwinner,sun50i-h5-sid", .data = &sun50i_a64_cfg },
250 		.name = "eeprom-sunxi-sid",