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From 82a678435e9937dc8a7cb801f476e340fcfbc23e Mon Sep 17 00:00:00 2001
From: John Crispin <blogic@openwrt.org>
Date: Thu, 8 Aug 2013 14:02:23 +0200
Subject: [PATCH 02/34] MIPS: lantiq: adds minimal dcdc driver
This driver so far only reads the core voltage.
Signed-off-by: John Crispin <blogic@openwrt.org>
Acked-by: John Crispin <blogic@openwrt.org>
Patchwork: http://patchwork.linux-mips.org/patch/5677/
---
arch/mips/lantiq/xway/Makefile | 2 +-
arch/mips/lantiq/xway/dcdc.c | 63 ++++++++++++++++++++++++++++++++++++++++
2 files changed, 64 insertions(+), 1 deletion(-)
create mode 100644 arch/mips/lantiq/xway/dcdc.c
diff --git a/arch/mips/lantiq/xway/Makefile b/arch/mips/lantiq/xway/Makefile
index 7a13660..087497d 100644
--- 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
diff --git a/arch/mips/lantiq/xway/dcdc.c b/arch/mips/lantiq/xway/dcdc.c
new file mode 100644
index 0000000..7688ac0
--- /dev/null
+++ b/arch/mips/lantiq/xway/dcdc.c
@@ -0,0 +1,63 @@
+/*
+ * 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/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",
+ .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);
--
1.7.10.4
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