1 // SPDX-License-Identifier: GPL-2.0
9 #include <linux/nvmem-provider.h>
15 /* Efuse controller registers definition */
61  * On Spreadtrum platform, we have multi-subsystems will access the unique
62  * efuse controller, so we need one hardware spinlock to synchronize between
65 static int sc27xx_efuse_lock(struct sc27xx_efuse *efuse)  in sc27xx_efuse_lock()  argument
69 	mutex_lock(&efuse->mutex);  in sc27xx_efuse_lock()
71 	ret = hwspin_lock_timeout_raw(efuse->hwlock,  in sc27xx_efuse_lock()
74 		dev_err(efuse->dev, "timeout to get the hwspinlock\n");  in sc27xx_efuse_lock()
75 		mutex_unlock(&efuse->mutex);  in sc27xx_efuse_lock()
82 static void sc27xx_efuse_unlock(struct sc27xx_efuse *efuse)  in sc27xx_efuse_unlock()  argument
84 	hwspin_unlock_raw(efuse->hwlock);  in sc27xx_efuse_unlock()
85 	mutex_unlock(&efuse->mutex);  in sc27xx_efuse_unlock()
88 static int sc27xx_efuse_poll_status(struct sc27xx_efuse *efuse, u32 bits)  in sc27xx_efuse_poll_status()  argument
93 	ret = regmap_read_poll_timeout(efuse->regmap,  in sc27xx_efuse_poll_status()
94 				       efuse->base + SC27XX_EFUSE_STATUS,  in sc27xx_efuse_poll_status()
99 		dev_err(efuse->dev, "timeout to update the efuse status\n");  in sc27xx_efuse_poll_status()
108 	struct sc27xx_efuse *efuse = context;  in sc27xx_efuse_read()  local
113 		return -EINVAL;  in sc27xx_efuse_read()
115 	ret = sc27xx_efuse_lock(efuse);  in sc27xx_efuse_read()
119 	/* Enable the efuse controller. */  in sc27xx_efuse_read()
120 	ret = regmap_update_bits(efuse->regmap, SC27XX_MODULE_EN,  in sc27xx_efuse_read()
126 	 * Before reading, we should ensure the efuse controller is in  in sc27xx_efuse_read()
129 	ret = sc27xx_efuse_poll_status(efuse, SC27XX_EFUSE_STANDBY);  in sc27xx_efuse_read()
134 	ret = regmap_write(efuse->regmap,  in sc27xx_efuse_read()
135 			   efuse->base + SC27XX_EFUSE_BLOCK_INDEX,  in sc27xx_efuse_read()
140 	/* Start reading process from efuse memory. */  in sc27xx_efuse_read()
141 	ret = regmap_update_bits(efuse->regmap,  in sc27xx_efuse_read()
142 				 efuse->base + SC27XX_EFUSE_MODE_CTRL,  in sc27xx_efuse_read()
152 	ret = sc27xx_efuse_poll_status(efuse, SC27XX_EFUSE_RD_DONE);  in sc27xx_efuse_read()
156 	/* Read data from efuse memory. */  in sc27xx_efuse_read()
157 	ret = regmap_read(efuse->regmap, efuse->base + SC27XX_EFUSE_DATA_RD,  in sc27xx_efuse_read()
163 	ret = regmap_update_bits(efuse->regmap,  in sc27xx_efuse_read()
164 				 efuse->base + SC27XX_EFUSE_MODE_CTRL,  in sc27xx_efuse_read()
169 	/* Disable the efuse controller after reading. */  in sc27xx_efuse_read()
170 	regmap_update_bits(efuse->regmap, SC27XX_MODULE_EN, SC27XX_EFUSE_EN, 0);  in sc27xx_efuse_read()
172 	sc27xx_efuse_unlock(efuse);  in sc27xx_efuse_read()
182 	struct device_node *np = pdev->dev.of_node;  in sc27xx_efuse_probe()
185 	struct sc27xx_efuse *efuse;  in sc27xx_efuse_probe()  local
188 	efuse = devm_kzalloc(&pdev->dev, sizeof(*efuse), GFP_KERNEL);  in sc27xx_efuse_probe()
189 	if (!efuse)  in sc27xx_efuse_probe()
190 		return -ENOMEM;  in sc27xx_efuse_probe()
192 	efuse->regmap = dev_get_regmap(pdev->dev.parent, NULL);  in sc27xx_efuse_probe()
193 	if (!efuse->regmap) {  in sc27xx_efuse_probe()
194 		dev_err(&pdev->dev, "failed to get efuse regmap\n");  in sc27xx_efuse_probe()
195 		return -ENODEV;  in sc27xx_efuse_probe()
198 	ret = of_property_read_u32(np, "reg", &efuse->base);  in sc27xx_efuse_probe()
200 		dev_err(&pdev->dev, "failed to get efuse base address\n");  in sc27xx_efuse_probe()
206 		dev_err(&pdev->dev, "failed to get hwspinlock id\n");  in sc27xx_efuse_probe()
210 	efuse->hwlock = hwspin_lock_request_specific(ret);  in sc27xx_efuse_probe()
211 	if (!efuse->hwlock) {  in sc27xx_efuse_probe()
212 		dev_err(&pdev->dev, "failed to request hwspinlock\n");  in sc27xx_efuse_probe()
213 		return -ENXIO;  in sc27xx_efuse_probe()
216 	mutex_init(&efuse->mutex);  in sc27xx_efuse_probe()
217 	efuse->dev = &pdev->dev;  in sc27xx_efuse_probe()
218 	platform_set_drvdata(pdev, efuse);  in sc27xx_efuse_probe()
223 	econfig.name = "sc27xx-efuse";  in sc27xx_efuse_probe()
224 	econfig.size = SC27XX_EFUSE_BLOCK_MAX * SC27XX_EFUSE_BLOCK_WIDTH;  in sc27xx_efuse_probe()
226 	econfig.priv = efuse;  in sc27xx_efuse_probe()
227 	econfig.dev = &pdev->dev;  in sc27xx_efuse_probe()
228 	nvmem = devm_nvmem_register(&pdev->dev, &econfig);  in sc27xx_efuse_probe()
230 		dev_err(&pdev->dev, "failed to register nvmem config\n");  in sc27xx_efuse_probe()
231 		hwspin_lock_free(efuse->hwlock);  in sc27xx_efuse_probe()
240 	struct sc27xx_efuse *efuse = platform_get_drvdata(pdev);  in sc27xx_efuse_remove()  local
242 	hwspin_lock_free(efuse->hwlock);  in sc27xx_efuse_remove()
247 	{ .compatible = "sprd,sc2731-efuse" },
255 		.name = "sc27xx-efuse",
263 MODULE_DESCRIPTION("Spreadtrum SC27xx efuse driver");