From 1f95983593d5b6634c13ead8f923237484dc611e Mon Sep 17 00:00:00 2001
From: John Crispin <blogic@openwrt.org>
Date: Wed, 5 Dec 2012 17:38:48 +0100
Subject: [PATCH 31/40] MIPS: lantiq: adds minimal dcdc driver

This driver so far only reads the core voltage.

Signed-off-by: John Crispin <blogic@openwrt.org>
---
 arch/mips/lantiq/xway/Makefile |    2 +-
 arch/mips/lantiq/xway/dcdc.c   |   74 ++++++++++++++++++++++++++++++++++++++++
 2 files changed, 75 insertions(+), 1 deletion(-)
 create mode 100644 arch/mips/lantiq/xway/dcdc.c

--- a/arch/mips/lantiq/xway/Makefile
+++ b/arch/mips/lantiq/xway/Makefile
@@ -1,3 +1,3 @@
-obj-y := prom.o sysctrl.o clk.o reset.o dma.o gptu.o
+obj-y := prom.o sysctrl.o clk.o reset.o dma.o gptu.o dcdc.o
 
 obj-$(CONFIG_XRX200_PHY_FW) += xrx200_phy_fw.o
--- /dev/null
+++ b/arch/mips/lantiq/xway/dcdc.c
@@ -0,0 +1,74 @@
+/*
+ *  This program is free software; you can redistribute it and/or modify it
+ *  under the terms of the GNU General Public License version 2 as published
+ *  by the Free Software Foundation.
+ *
+ *  Copyright (C) 2012 John Crispin <blogic@openwrt.org>
+ *  Copyright (C) 2010 Sameer Ahmad, Lantiq GmbH
+ */
+
+#include <linux/interrupt.h>
+#include <linux/ioport.h>
+#include <linux/module.h>
+#include <linux/of_platform.h>
+#include <linux/of_irq.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);
+	if (!res) {
+		dev_err(&pdev->dev, "Failed to get resource\n");
+		return -ENOMEM;
+	}
+
+	/* remap dcdc register range */
+	dcdc_membase = devm_request_and_ioremap(&pdev->dev, res);
+	if (!dcdc_membase) {
+		dev_err(&pdev->dev, "Failed to remap resource\n");
+		return -ENOMEM;
+	}
+
+	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" },
+	{},
+};
+MODULE_DEVICE_TABLE(of, dcdc_match);
+
+static struct platform_driver dcdc_driver = {
+	.probe = dcdc_probe,
+	.driver = {
+		.name = "dcdc-xrx200",
+		.owner = THIS_MODULE,
+		.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);