2  * Freescale MXS On-Chip OTP driver
19 #include <linux/clk.h>
20 #include <linux/delay.h>
25 #include <linux/nvmem-provider.h>
41 	struct clk *clk;  member
51 	while (timeout--) {  in mxs_ocotp_wait()
52 		status = readl(otp->base);  in mxs_ocotp_wait()
61 		return -EBUSY;  in mxs_ocotp_wait()
63 		return -EIO;  in mxs_ocotp_wait()
75 	ret = clk_enable(otp->clk);  in mxs_ocotp_read()
79 	writel(BM_OCOTP_CTRL_ERROR, otp->base + STMP_OFFSET_REG_CLR);  in mxs_ocotp_read()
86 	writel(BM_OCOTP_CTRL_RD_BANK_OPEN, otp->base + STMP_OFFSET_REG_SET);  in mxs_ocotp_read()
88 	/* approximately wait 33 hclk cycles */  in mxs_ocotp_read()
97 			/* fill up non-data register */  in mxs_ocotp_read()
100 			*buf++ = readl(otp->base + offset);  in mxs_ocotp_read()
103 		bytes -= 4;  in mxs_ocotp_read()
109 	writel(BM_OCOTP_CTRL_RD_BANK_OPEN, otp->base + STMP_OFFSET_REG_CLR);  in mxs_ocotp_read()
112 	clk_disable(otp->clk);  in mxs_ocotp_read()
118 	.name = "mxs-ocotp",
137 	{ .compatible = "fsl,imx23-ocotp", .data = &imx23_data },
138 	{ .compatible = "fsl,imx28-ocotp", .data = &imx28_data },
145 	struct device *dev = &pdev->dev;  in mxs_ocotp_probe()
152 	match = of_match_device(dev->driver->of_match_table, dev);  in mxs_ocotp_probe()
153 	if (!match || !match->data)  in mxs_ocotp_probe()
154 		return -EINVAL;  in mxs_ocotp_probe()
158 		return -ENOMEM;  in mxs_ocotp_probe()
161 	otp->base = devm_ioremap_resource(dev, res);  in mxs_ocotp_probe()
162 	if (IS_ERR(otp->base))  in mxs_ocotp_probe()
163 		return PTR_ERR(otp->base);  in mxs_ocotp_probe()
165 	otp->clk = devm_clk_get(&pdev->dev, NULL);  in mxs_ocotp_probe()
166 	if (IS_ERR(otp->clk))  in mxs_ocotp_probe()
167 		return PTR_ERR(otp->clk);  in mxs_ocotp_probe()
169 	ret = clk_prepare(otp->clk);  in mxs_ocotp_probe()
171 		dev_err(dev, "failed to prepare clk: %d\n", ret);  in mxs_ocotp_probe()
175 	data = match->data;  in mxs_ocotp_probe()
177 	ocotp_config.size = data->size;  in mxs_ocotp_probe()
180 	otp->nvmem = nvmem_register(&ocotp_config);  in mxs_ocotp_probe()
181 	if (IS_ERR(otp->nvmem)) {  in mxs_ocotp_probe()
182 		ret = PTR_ERR(otp->nvmem);  in mxs_ocotp_probe()
191 	clk_unprepare(otp->clk);  in mxs_ocotp_probe()
200 	clk_unprepare(otp->clk);  in mxs_ocotp_remove()
202 	return nvmem_unregister(otp->nvmem);  in mxs_ocotp_remove()
209 		.name = "mxs-ocotp",