3  * NXP LPC18xx/LPC43xx EEPROM memory NVMEM driver
38 /* EEPROM device requires a ~1500 kHz clock (min 800 kHz, max 1600 kHz) */
41 /* EEPROM requires 3 ms of erase/program time between each writing */
54 static inline void lpc18xx_eeprom_writel(struct lpc18xx_eeprom_dev *eeprom,  in lpc18xx_eeprom_writel()  argument
57 	writel(val, eeprom->reg_base + reg);  in lpc18xx_eeprom_writel()
60 static inline u32 lpc18xx_eeprom_readl(struct lpc18xx_eeprom_dev *eeprom,  in lpc18xx_eeprom_readl()  argument
63 	return readl(eeprom->reg_base + reg);  in lpc18xx_eeprom_readl()
66 static int lpc18xx_eeprom_busywait_until_prog(struct lpc18xx_eeprom_dev *eeprom)  in lpc18xx_eeprom_busywait_until_prog()  argument
71 	/* Wait until EEPROM program operation has finished */  in lpc18xx_eeprom_busywait_until_prog()
75 		val = lpc18xx_eeprom_readl(eeprom, LPC18XX_EEPROM_INTSTAT);  in lpc18xx_eeprom_busywait_until_prog()
78 			lpc18xx_eeprom_writel(eeprom, LPC18XX_EEPROM_INTSTATCLR,  in lpc18xx_eeprom_busywait_until_prog()
93 	struct lpc18xx_eeprom_dev *eeprom = context;  in lpc18xx_eeprom_gather_write()  local
98 	 * The last page contains the EEPROM initialization data and is not  in lpc18xx_eeprom_gather_write()
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()
106 	lpc18xx_eeprom_writel(eeprom, LPC18XX_EEPROM_PWRDWN,  in lpc18xx_eeprom_gather_write()
109 	/* Wait 100 us while the EEPROM wakes up */  in lpc18xx_eeprom_gather_write()
113 		writel(*(u32 *)val, eeprom->mem_base + offset);  in lpc18xx_eeprom_gather_write()
114 		ret = lpc18xx_eeprom_busywait_until_prog(eeprom);  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()
123 	lpc18xx_eeprom_writel(eeprom, LPC18XX_EEPROM_PWRDWN,  in lpc18xx_eeprom_gather_write()
132 	struct lpc18xx_eeprom_dev *eeprom = context;  in lpc18xx_eeprom_read()  local
134 	lpc18xx_eeprom_writel(eeprom, LPC18XX_EEPROM_PWRDWN,  in lpc18xx_eeprom_read()
137 	/* Wait 100 us while the EEPROM wakes up */  in lpc18xx_eeprom_read()
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()
147 	lpc18xx_eeprom_writel(eeprom, LPC18XX_EEPROM_PWRDWN,  in lpc18xx_eeprom_read()
155 	.name = "lpc18xx-eeprom",
164 	struct lpc18xx_eeprom_dev *eeprom;  in lpc18xx_eeprom_probe()  local
171 	eeprom = devm_kzalloc(dev, sizeof(*eeprom), GFP_KERNEL);  in lpc18xx_eeprom_probe()
172 	if (!eeprom)  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()
193 		dev_err(dev, "failed to prepare/enable eeprom clk: %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()
219 	lpc18xx_eeprom_writel(eeprom, LPC18XX_EEPROM_CLKDIV, clk_rate);  in lpc18xx_eeprom_probe()
225 	lpc18xx_eeprom_writel(eeprom, LPC18XX_EEPROM_AUTOPROG,  in lpc18xx_eeprom_probe()
228 	lpc18xx_eeprom_writel(eeprom, LPC18XX_EEPROM_PWRDWN,  in lpc18xx_eeprom_probe()
231 	eeprom->size = resource_size(res);  in lpc18xx_eeprom_probe()
234 	lpc18xx_nvmem_config.priv = eeprom;  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()
242 	platform_set_drvdata(pdev, eeprom);  in lpc18xx_eeprom_probe()
247 	clk_disable_unprepare(eeprom->clk);  in lpc18xx_eeprom_probe()
254 	struct lpc18xx_eeprom_dev *eeprom = platform_get_drvdata(pdev);  in lpc18xx_eeprom_remove()  local
256 	clk_disable_unprepare(eeprom->clk);  in lpc18xx_eeprom_remove()
260 	{ .compatible = "nxp,lpc1857-eeprom" },
269 		.name = "lpc18xx-eeprom",
277 MODULE_DESCRIPTION("NXP LPC18xx EEPROM memory Driver");