1 // SPDX-License-Identifier: GPL-2.0-or-later
3  * Freescale MXS On-Chip OTP driver
15 #include <linux/nvmem-provider.h>
36 static int mxs_ocotp_wait(struct mxs_ocotp *otp)  in mxs_ocotp_wait()  argument
41 	while (timeout--) {  in mxs_ocotp_wait()
42 		status = readl(otp->base);  in mxs_ocotp_wait()
51 		return -EBUSY;  in mxs_ocotp_wait()
53 		return -EIO;  in mxs_ocotp_wait()
61 	struct mxs_ocotp *otp = context;  in mxs_ocotp_read()  local
65 	ret = clk_enable(otp->clk);  in mxs_ocotp_read()
69 	writel(BM_OCOTP_CTRL_ERROR, otp->base + STMP_OFFSET_REG_CLR);  in mxs_ocotp_read()
71 	ret = mxs_ocotp_wait(otp);  in mxs_ocotp_read()
76 	writel(BM_OCOTP_CTRL_RD_BANK_OPEN, otp->base + STMP_OFFSET_REG_SET);  in mxs_ocotp_read()
79 	udelay(1);  in mxs_ocotp_read()
81 	ret = mxs_ocotp_wait(otp);  in mxs_ocotp_read()
87 			/* fill up non-data register */  in mxs_ocotp_read()
90 			*buf++ = readl(otp->base + offset);  in mxs_ocotp_read()
93 		bytes -= 4;  in mxs_ocotp_read()
99 	writel(BM_OCOTP_CTRL_RD_BANK_OPEN, otp->base + STMP_OFFSET_REG_CLR);  in mxs_ocotp_read()
102 	clk_disable(otp->clk);  in mxs_ocotp_read()
108 	.name = "mxs-ocotp",
127 	{ .compatible = "fsl,imx23-ocotp", .data = &imx23_data },
128 	{ .compatible = "fsl,imx28-ocotp", .data = &imx28_data },
140 	struct device *dev = &pdev->dev;  in mxs_ocotp_probe()
142 	struct mxs_ocotp *otp;  in mxs_ocotp_probe()  local
146 	match = of_match_device(dev->driver->of_match_table, dev);  in mxs_ocotp_probe()
147 	if (!match || !match->data)  in mxs_ocotp_probe()
148 		return -EINVAL;  in mxs_ocotp_probe()
150 	otp = devm_kzalloc(dev, sizeof(*otp), GFP_KERNEL);  in mxs_ocotp_probe()
151 	if (!otp)  in mxs_ocotp_probe()
152 		return -ENOMEM;  in mxs_ocotp_probe()
154 	otp->base = devm_platform_ioremap_resource(pdev, 0);  in mxs_ocotp_probe()
155 	if (IS_ERR(otp->base))  in mxs_ocotp_probe()
156 		return PTR_ERR(otp->base);  in mxs_ocotp_probe()
158 	otp->clk = devm_clk_get(&pdev->dev, NULL);  in mxs_ocotp_probe()
159 	if (IS_ERR(otp->clk))  in mxs_ocotp_probe()
160 		return PTR_ERR(otp->clk);  in mxs_ocotp_probe()
162 	ret = clk_prepare(otp->clk);  in mxs_ocotp_probe()
168 	ret = devm_add_action_or_reset(&pdev->dev, mxs_ocotp_action, otp->clk);  in mxs_ocotp_probe()
172 	data = match->data;  in mxs_ocotp_probe()
174 	ocotp_config.size = data->size;  in mxs_ocotp_probe()
175 	ocotp_config.priv = otp;  in mxs_ocotp_probe()
177 	otp->nvmem = devm_nvmem_register(dev, &ocotp_config);  in mxs_ocotp_probe()
178 	if (IS_ERR(otp->nvmem))  in mxs_ocotp_probe()
179 		return PTR_ERR(otp->nvmem);  in mxs_ocotp_probe()
181 	platform_set_drvdata(pdev, otp);  in mxs_ocotp_probe()
189 		.name = "mxs-ocotp",