drivers/nvmem/lpc18xx_eeprom.c

54 static inline void lpc18xx_eeprom_writel(struct lpc18xx_eeprom_dev *eeprom,
57 	writel(val, eeprom->reg_base + reg);
60 static inline u32 lpc18xx_eeprom_readl(struct lpc18xx_eeprom_dev *eeprom,
63 	return readl(eeprom->reg_base + reg);
66 static int lpc18xx_eeprom_busywait_until_prog(struct lpc18xx_eeprom_dev *eeprom)
75 		val = lpc18xx_eeprom_readl(eeprom, LPC18XX_EEPROM_INTSTAT);
78 			lpc18xx_eeprom_writel(eeprom, LPC18XX_EEPROM_INTSTATCLR,
93 	struct lpc18xx_eeprom_dev *eeprom = context;
101 	if ((reg > eeprom->size - LPC18XX_EEPROM_PAGE_SIZE) ||
102 			(reg + bytes > eeprom->size - LPC18XX_EEPROM_PAGE_SIZE))
106 	lpc18xx_eeprom_writel(eeprom, LPC18XX_EEPROM_PWRDWN,
113 		writel(*(u32 *)val, eeprom->mem_base + offset);
114 		ret = lpc18xx_eeprom_busywait_until_prog(eeprom);
118 		bytes -= eeprom->val_bytes;
119 		val += eeprom->val_bytes;
120 		offset += eeprom->val_bytes;
123 	lpc18xx_eeprom_writel(eeprom, LPC18XX_EEPROM_PWRDWN,
132 	struct lpc18xx_eeprom_dev *eeprom = context;
134 	lpc18xx_eeprom_writel(eeprom, LPC18XX_EEPROM_PWRDWN,
141 		*(u32 *)val = readl(eeprom->mem_base + offset);
142 		bytes -= eeprom->val_bytes;
143 		val += eeprom->val_bytes;
144 		offset += eeprom->val_bytes;
147 	lpc18xx_eeprom_writel(eeprom, LPC18XX_EEPROM_PWRDWN,
155 	.name = "lpc18xx-eeprom",
164 	struct lpc18xx_eeprom_dev *eeprom;
171 	eeprom = devm_kzalloc(dev, sizeof(*eeprom), GFP_KERNEL);
172 	if (!eeprom)
176 	eeprom->reg_base = devm_ioremap_resource(dev, res);
177 	if (IS_ERR(eeprom->reg_base))
178 		return PTR_ERR(eeprom->reg_base);
181 	eeprom->mem_base = devm_ioremap_resource(dev, res);
182 	if (IS_ERR(eeprom->mem_base))
183 		return PTR_ERR(eeprom->mem_base);
185 	eeprom->clk = devm_clk_get(&pdev->dev, "eeprom");
186 	if (IS_ERR(eeprom->clk)) {
187 		dev_err(&pdev->dev, "failed to get eeprom clock\n");
188 		return PTR_ERR(eeprom->clk);
191 	ret = clk_prepare_enable(eeprom->clk);
193 		dev_err(dev, "failed to prepare/enable eeprom clk: %d\n", ret);
210 	eeprom->val_bytes = 4;
211 	eeprom->reg_bytes = 4;
217 	clk_rate = clk_get_rate(eeprom->clk);
219 	lpc18xx_eeprom_writel(eeprom, LPC18XX_EEPROM_CLKDIV, clk_rate);
225 	lpc18xx_eeprom_writel(eeprom, LPC18XX_EEPROM_AUTOPROG,
228 	lpc18xx_eeprom_writel(eeprom, LPC18XX_EEPROM_PWRDWN,
231 	eeprom->size = resource_size(res);
234 	lpc18xx_nvmem_config.priv = eeprom;
236 	eeprom->nvmem = devm_nvmem_register(dev, &lpc18xx_nvmem_config);
237 	if (IS_ERR(eeprom->nvmem)) {
238 		ret = PTR_ERR(eeprom->nvmem);
242 	platform_set_drvdata(pdev, eeprom);
247 	clk_disable_unprepare(eeprom->clk);
254 	struct lpc18xx_eeprom_dev *eeprom = platform_get_drvdata(pdev);
256 	clk_disable_unprepare(eeprom->clk);
262 	{ .compatible = "nxp,lpc1857-eeprom" },
271 		.name = "lpc18xx-eeprom",