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-rw-r--r--arch/mips/lantiq/xway/dcdc.c60
1 files changed, 60 insertions, 0 deletions
diff --git a/arch/mips/lantiq/xway/dcdc.c b/arch/mips/lantiq/xway/dcdc.c
new file mode 100644
index 000000000..4960bee0a
--- /dev/null
+++ b/arch/mips/lantiq/xway/dcdc.c
@@ -0,0 +1,60 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ *
+ * Copyright (C) 2012 John Crispin <john@phrozen.org>
+ * Copyright (C) 2010 Sameer Ahmad, Lantiq GmbH
+ */
+
+#include <linux/ioport.h>
+#include <linux/of_platform.h>
+
+#include <lantiq_soc.h>
+
+/* Bias and regulator Setup Register */
+#define DCDC_BIAS_VREG0 0xa
+/* Bias and regulator Setup Register */
+#define DCDC_BIAS_VREG1 0xb
+
+#define dcdc_w8(x, y) ltq_w8((x), dcdc_membase + (y))
+#define dcdc_r8(x) ltq_r8(dcdc_membase + (x))
+
+static void __iomem *dcdc_membase;
+
+static int dcdc_probe(struct platform_device *pdev)
+{
+ struct resource *res;
+
+ res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+ dcdc_membase = devm_ioremap_resource(&pdev->dev, res);
+ if (IS_ERR(dcdc_membase))
+ return PTR_ERR(dcdc_membase);
+
+ dev_info(&pdev->dev, "Core Voltage : %d mV\n",
+ dcdc_r8(DCDC_BIAS_VREG1) * 8);
+
+ return 0;
+}
+
+static const struct of_device_id dcdc_match[] = {
+ { .compatible = "lantiq,dcdc-xrx200" },
+ {},
+};
+
+static struct platform_driver dcdc_driver = {
+ .probe = dcdc_probe,
+ .driver = {
+ .name = "dcdc-xrx200",
+ .of_match_table = dcdc_match,
+ },
+};
+
+int __init dcdc_init(void)
+{
+ int ret = platform_driver_register(&dcdc_driver);
+
+ if (ret)
+ pr_info("dcdc: Error registering platform driver\n");
+ return ret;
+}
+
+arch_initcall(dcdc_init);