1 // SPDX-License-Identifier: GPL-2.0-only
13 #include <linux/nvmem-provider.h>
20 /* Amount of time required to hold charge to blow fuse in micro-seconds */
41  * struct qfprom_soc_data - config that varies from SoC to SoC.
44  * @qfprom_blow_timer_value: The timer value of qfprom when doing efuse blow.
55  * struct qfprom_priv - structure holding qfprom attributes
57  * @qfpraw:       iomapped memory space for qfprom-efuse raw address space.
58  * @qfpconf:      iomapped memory space for qfprom-efuse configuration address
79  * struct qfprom_touched_values - saved values to restore after blowing
92  * qfprom_disable_fuse_blowing() - Undo enabling of fuse blowing.
97  * and voltage settings.
107 	writel(old->timer_val, priv->qfpconf + QFPROM_BLOW_TIMER_OFFSET);  in qfprom_disable_fuse_blowing()
108 	writel(old->accel_val, priv->qfpconf + QFPROM_ACCEL_OFFSET);  in qfprom_disable_fuse_blowing()
116 	ret = regulator_set_voltage(priv->vcc, 0, INT_MAX);  in qfprom_disable_fuse_blowing()
118 		dev_warn(priv->dev, "Failed to set 0 voltage (ignoring)\n");  in qfprom_disable_fuse_blowing()
120 	ret = regulator_disable(priv->vcc);  in qfprom_disable_fuse_blowing()
122 		dev_warn(priv->dev, "Failed to disable regulator (ignoring)\n");  in qfprom_disable_fuse_blowing()
124 	ret = clk_set_rate(priv->secclk, old->clk_rate);  in qfprom_disable_fuse_blowing()
126 		dev_warn(priv->dev,  in qfprom_disable_fuse_blowing()
129 	clk_disable_unprepare(priv->secclk);  in qfprom_disable_fuse_blowing()
133  * qfprom_enable_fuse_blowing() - Enable fuse blowing.
138  * and voltage settings.
142  * Return: 0 or -err.
149 	ret = clk_prepare_enable(priv->secclk);  in qfprom_enable_fuse_blowing()
151 		dev_err(priv->dev, "Failed to enable clock\n");  in qfprom_enable_fuse_blowing()
155 	old->clk_rate = clk_get_rate(priv->secclk);  in qfprom_enable_fuse_blowing()
156 	ret = clk_set_rate(priv->secclk, priv->soc_data->qfprom_blow_set_freq);  in qfprom_enable_fuse_blowing()
158 		dev_err(priv->dev, "Failed to set clock rate for enable\n");  in qfprom_enable_fuse_blowing()
164 	 * a rail shared do don't specify a max--regulator constraints  in qfprom_enable_fuse_blowing()
167 	ret = regulator_set_voltage(priv->vcc, 1800000, INT_MAX);  in qfprom_enable_fuse_blowing()
169 		dev_err(priv->dev, "Failed to set 1.8 voltage\n");  in qfprom_enable_fuse_blowing()
173 	ret = regulator_enable(priv->vcc);  in qfprom_enable_fuse_blowing()
175 		dev_err(priv->dev, "Failed to enable regulator\n");  in qfprom_enable_fuse_blowing()
179 	old->timer_val = readl(priv->qfpconf + QFPROM_BLOW_TIMER_OFFSET);  in qfprom_enable_fuse_blowing()
180 	old->accel_val = readl(priv->qfpconf + QFPROM_ACCEL_OFFSET);  in qfprom_enable_fuse_blowing()
181 	writel(priv->soc_data->qfprom_blow_timer_value,  in qfprom_enable_fuse_blowing()
182 	       priv->qfpconf + QFPROM_BLOW_TIMER_OFFSET);  in qfprom_enable_fuse_blowing()
183 	writel(priv->soc_data->accel_value,  in qfprom_enable_fuse_blowing()
184 	       priv->qfpconf + QFPROM_ACCEL_OFFSET);  in qfprom_enable_fuse_blowing()
189 	clk_set_rate(priv->secclk, old->clk_rate);  in qfprom_enable_fuse_blowing()
191 	clk_disable_unprepare(priv->secclk);  in qfprom_enable_fuse_blowing()
196  * qfprom_efuse_reg_write() - Write to fuses.
204  * Return: 0 or -err.
217 	dev_dbg(priv->dev,  in qfprom_reg_write()
227 		dev_err(priv->dev,  in qfprom_reg_write()
229 		return -EINVAL;  in qfprom_reg_write()
232 		dev_err(priv->dev,  in qfprom_reg_write()
234 		return -EINVAL;  in qfprom_reg_write()
242 		priv->qfpconf + QFPROM_BLOW_STATUS_OFFSET,  in qfprom_reg_write()
247 		dev_err(priv->dev,  in qfprom_reg_write()
253 		writel(value[i], priv->qfpraw + reg + (i * 4));  in qfprom_reg_write()
256 		priv->qfpconf + QFPROM_BLOW_STATUS_OFFSET,  in qfprom_reg_write()
262 		dev_err(priv->dev, "Timeout waiting for finish.\n");  in qfprom_reg_write()
276 	void __iomem *base = priv->qfpcorrected;  in qfprom_reg_read()
278 	if (read_raw_data && priv->qfpraw)  in qfprom_reg_read()
279 		base = priv->qfpraw;  in qfprom_reg_read()
281 	while (words--)  in qfprom_reg_read()
302 	struct device *dev = &pdev->dev;  in qfprom_probe()
310 		return -ENOMEM;  in qfprom_probe()
314 	priv->qfpcorrected = devm_ioremap_resource(dev, res);  in qfprom_probe()
315 	if (IS_ERR(priv->qfpcorrected))  in qfprom_probe()
316 		return PTR_ERR(priv->qfpcorrected);  in qfprom_probe()
322 	priv->dev = dev;  in qfprom_probe()
333 		priv->qfpraw = devm_ioremap_resource(dev, res);  in qfprom_probe()
334 		if (IS_ERR(priv->qfpraw))  in qfprom_probe()
335 			return PTR_ERR(priv->qfpraw);  in qfprom_probe()
337 		priv->qfpconf = devm_ioremap_resource(dev, res);  in qfprom_probe()
338 		if (IS_ERR(priv->qfpconf))  in qfprom_probe()
339 			return PTR_ERR(priv->qfpconf);  in qfprom_probe()
341 		priv->qfpsecurity = devm_ioremap_resource(dev, res);  in qfprom_probe()
342 		if (IS_ERR(priv->qfpsecurity))  in qfprom_probe()
343 			return PTR_ERR(priv->qfpsecurity);  in qfprom_probe()
345 		version = readl(priv->qfpsecurity + QFPROM_VERSION_OFFSET);  in qfprom_probe()
352 			priv->soc_data = &qfprom_7_8_data;  in qfprom_probe()
354 		priv->vcc = devm_regulator_get(&pdev->dev, "vcc");  in qfprom_probe()
355 		if (IS_ERR(priv->vcc))  in qfprom_probe()
356 			return PTR_ERR(priv->vcc);  in qfprom_probe()
358 		priv->secclk = devm_clk_get(dev, "core");  in qfprom_probe()
359 		if (IS_ERR(priv->secclk)) {  in qfprom_probe()
360 			ret = PTR_ERR(priv->secclk);  in qfprom_probe()
361 			if (ret != -EPROBE_DEFER)  in qfprom_probe()
367 		if (priv->soc_data)  in qfprom_probe()