1 // SPDX-License-Identifier: GPL-2.0-or-later
3  * JZ4780 EFUSE Memory Support driver
10  * Currently supports JZ4780 efuse which has 8K programmable bit.
11  * Efuse is separated into seven segments as below:
13  * -----------------------------------------------------------------------
15  * -----------------------------------------------------------------------
27 #include <linux/nvmem-provider.h>
72 	struct jz4780_efuse *efuse = context;  in jz4780_efuse_read()  local
75 		size_t start = offset & ~(JZ_EFU_READ_SIZE - 1);  in jz4780_efuse_read()
77 				    - offset);  in jz4780_efuse_read()
84 			| ((JZ_EFU_READ_SIZE - 1) << EFUCTRL_LEN_SHIFT)  in jz4780_efuse_read()
87 		regmap_update_bits(efuse->map, JZ_EFUCTRL,  in jz4780_efuse_read()
94 		ret = regmap_read_poll_timeout(efuse->map, JZ_EFUSTATE,  in jz4780_efuse_read()
99 			dev_err(efuse->dev, "Time out while reading efuse data");  in jz4780_efuse_read()
103 		ret = regmap_bulk_read(efuse->map, JZ_EFUDATA(0),  in jz4780_efuse_read()
108 		memcpy(val, &buf[offset - start], chunk);  in jz4780_efuse_read()
112 		bytes -= chunk;  in jz4780_efuse_read()
119 	.name = "jz4780-efuse",
142 	struct jz4780_efuse *efuse;  in jz4780_efuse_probe()  local
147 	struct device *dev = &pdev->dev;  in jz4780_efuse_probe()
151 	efuse = devm_kzalloc(dev, sizeof(*efuse), GFP_KERNEL);  in jz4780_efuse_probe()
152 	if (!efuse)  in jz4780_efuse_probe()
153 		return -ENOMEM;  in jz4780_efuse_probe()
159 	efuse->map = devm_regmap_init_mmio(dev, regs,  in jz4780_efuse_probe()
161 	if (IS_ERR(efuse->map))  in jz4780_efuse_probe()
162 		return PTR_ERR(efuse->map);  in jz4780_efuse_probe()
164 	efuse->clk = devm_clk_get(&pdev->dev, NULL);  in jz4780_efuse_probe()
165 	if (IS_ERR(efuse->clk))  in jz4780_efuse_probe()
166 		return PTR_ERR(efuse->clk);  in jz4780_efuse_probe()
168 	ret = clk_prepare_enable(efuse->clk);  in jz4780_efuse_probe()
172 	ret = devm_add_action_or_reset(&pdev->dev,  in jz4780_efuse_probe()
174 				       efuse->clk);  in jz4780_efuse_probe()
178 	clk_rate = clk_get_rate(efuse->clk);  in jz4780_efuse_probe()
180 	efuse->dev = dev;  in jz4780_efuse_probe()
188 	 *   i.e. rd_strobe >= 35 ns / clk_period - 5 - rd_adj + 1  in jz4780_efuse_probe()
195 	rd_strobe = clk_rate / 28571429 - 5 - rd_adj + 1;  in jz4780_efuse_probe()
199 		dev_err(&pdev->dev, "Cannot set clock configuration\n");  in jz4780_efuse_probe()
200 		return -EINVAL;  in jz4780_efuse_probe()
203 	regmap_update_bits(efuse->map, JZ_EFUCFG,  in jz4780_efuse_probe()
210 	cfg.dev = &pdev->dev;  in jz4780_efuse_probe()
211 	cfg.priv = efuse;  in jz4780_efuse_probe()
219 	{ .compatible = "ingenic,jz4780-efuse" },
227 		.name = "jz4780-efuse",
236 MODULE_DESCRIPTION("Ingenic JZ4780 efuse driver");