1 // SPDX-License-Identifier: GPL-2.0-only
15 #include <linux/nvmem-provider.h>
17 #include <linux/reset.h>
41 /* EEPROM requires 3 ms of erase/program time between each writing */
57 	writel(val, eeprom->reg_base + reg);  in lpc18xx_eeprom_writel()
63 	return readl(eeprom->reg_base + reg);  in lpc18xx_eeprom_readl()
87 	return -ETIMEDOUT;  in lpc18xx_eeprom_busywait_until_prog()
101 	if ((reg > eeprom->size - LPC18XX_EEPROM_PAGE_SIZE) ||  in lpc18xx_eeprom_gather_write()
102 			(reg + bytes > eeprom->size - LPC18XX_EEPROM_PAGE_SIZE))  in lpc18xx_eeprom_gather_write()
103 		return -EINVAL;  in lpc18xx_eeprom_gather_write()
113 		writel(*(u32 *)val, eeprom->mem_base + offset);  in lpc18xx_eeprom_gather_write()
118 		bytes -= eeprom->val_bytes;  in lpc18xx_eeprom_gather_write()
119 		val += eeprom->val_bytes;  in lpc18xx_eeprom_gather_write()
120 		offset += eeprom->val_bytes;  in lpc18xx_eeprom_gather_write()
141 		*(u32 *)val = readl(eeprom->mem_base + offset);  in lpc18xx_eeprom_read()
142 		bytes -= eeprom->val_bytes;  in lpc18xx_eeprom_read()
143 		val += eeprom->val_bytes;  in lpc18xx_eeprom_read()
144 		offset += eeprom->val_bytes;  in lpc18xx_eeprom_read()
155 	.name = "lpc18xx-eeprom",
165 	struct device *dev = &pdev->dev;  in lpc18xx_eeprom_probe()
173 		return -ENOMEM;  in lpc18xx_eeprom_probe()
176 	eeprom->reg_base = devm_ioremap_resource(dev, res);  in lpc18xx_eeprom_probe()
177 	if (IS_ERR(eeprom->reg_base))  in lpc18xx_eeprom_probe()
178 		return PTR_ERR(eeprom->reg_base);  in lpc18xx_eeprom_probe()
181 	eeprom->mem_base = devm_ioremap_resource(dev, res);  in lpc18xx_eeprom_probe()
182 	if (IS_ERR(eeprom->mem_base))  in lpc18xx_eeprom_probe()
183 		return PTR_ERR(eeprom->mem_base);  in lpc18xx_eeprom_probe()
185 	eeprom->clk = devm_clk_get(&pdev->dev, "eeprom");  in lpc18xx_eeprom_probe()
186 	if (IS_ERR(eeprom->clk)) {  in lpc18xx_eeprom_probe()
187 		dev_err(&pdev->dev, "failed to get eeprom clock\n");  in lpc18xx_eeprom_probe()
188 		return PTR_ERR(eeprom->clk);  in lpc18xx_eeprom_probe()
191 	ret = clk_prepare_enable(eeprom->clk);  in lpc18xx_eeprom_probe()
199 		dev_err(dev, "failed to get reset: %ld\n", PTR_ERR(rst));  in lpc18xx_eeprom_probe()
206 		dev_err(dev, "failed to assert reset: %d\n", ret);  in lpc18xx_eeprom_probe()
210 	eeprom->val_bytes = 4;  in lpc18xx_eeprom_probe()
211 	eeprom->reg_bytes = 4;  in lpc18xx_eeprom_probe()
217 	clk_rate = clk_get_rate(eeprom->clk);  in lpc18xx_eeprom_probe()
218 	clk_rate = DIV_ROUND_UP(clk_rate, LPC18XX_EEPROM_CLOCK_HZ) - 1;  in lpc18xx_eeprom_probe()
231 	eeprom->size = resource_size(res);  in lpc18xx_eeprom_probe()
236 	eeprom->nvmem = devm_nvmem_register(dev, &lpc18xx_nvmem_config);  in lpc18xx_eeprom_probe()
237 	if (IS_ERR(eeprom->nvmem)) {  in lpc18xx_eeprom_probe()
238 		ret = PTR_ERR(eeprom->nvmem);  in lpc18xx_eeprom_probe()
247 	clk_disable_unprepare(eeprom->clk);  in lpc18xx_eeprom_probe()
256 	clk_disable_unprepare(eeprom->clk);  in lpc18xx_eeprom_remove()
262 	{ .compatible = "nxp,lpc1857-eeprom" },
271 		.name = "lpc18xx-eeprom",