99 lines
2.6 KiB
Diff
99 lines
2.6 KiB
Diff
From a810de459f90a62f5c1e27a2352b90318c5ef9a1 Mon Sep 17 00:00:00 2001
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From: John Crispin <blogic@openwrt.org>
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Date: Wed, 5 Dec 2012 17:38:48 +0100
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Subject: [PATCH 12/22] MIPS: lantiq: adds minimal dcdc driver
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This driver so far only reads the core voltage.
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Signed-off-by: John Crispin <blogic@openwrt.org>
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---
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arch/mips/lantiq/xway/Makefile | 2 +-
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arch/mips/lantiq/xway/dcdc.c | 74 ++++++++++++++++++++++++++++++++++++++++
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2 files changed, 75 insertions(+), 1 deletion(-)
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create mode 100644 arch/mips/lantiq/xway/dcdc.c
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--- a/arch/mips/lantiq/xway/Makefile
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+++ b/arch/mips/lantiq/xway/Makefile
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@@ -1,3 +1,3 @@
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-obj-y := prom.o sysctrl.o clk.o reset.o dma.o gptu.o
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+obj-y := prom.o sysctrl.o clk.o reset.o dma.o gptu.o dcdc.o
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obj-$(CONFIG_XRX200_PHY_FW) += xrx200_phy_fw.o
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--- /dev/null
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+++ b/arch/mips/lantiq/xway/dcdc.c
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@@ -0,0 +1,74 @@
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+/*
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+ * This program is free software; you can redistribute it and/or modify it
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+ * under the terms of the GNU General Public License version 2 as published
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+ * by the Free Software Foundation.
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+ *
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+ * Copyright (C) 2012 John Crispin <blogic@openwrt.org>
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+ * Copyright (C) 2010 Sameer Ahmad, Lantiq GmbH
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+ */
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+
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+#include <linux/interrupt.h>
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+#include <linux/ioport.h>
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+#include <linux/module.h>
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+#include <linux/of_platform.h>
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+#include <linux/of_irq.h>
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+
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+#include <lantiq_soc.h>
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+
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+/* Bias and regulator Setup Register */
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+#define DCDC_BIAS_VREG0 0xa
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+/* Bias and regulator Setup Register */
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+#define DCDC_BIAS_VREG1 0xb
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+
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+#define dcdc_w8(x, y) ltq_w8((x), dcdc_membase + (y))
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+#define dcdc_r8(x) ltq_r8(dcdc_membase + (x))
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+
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+static void __iomem *dcdc_membase;
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+
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+static int dcdc_probe(struct platform_device *pdev)
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+{
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+ struct resource *res;
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+
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+ res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
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+ if (!res) {
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+ dev_err(&pdev->dev, "Failed to get resource\n");
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+ return -ENOMEM;
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+ }
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+
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+ /* remap dcdc register range */
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+ dcdc_membase = devm_request_and_ioremap(&pdev->dev, res);
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+ if (!dcdc_membase) {
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+ dev_err(&pdev->dev, "Failed to remap resource\n");
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+ return -ENOMEM;
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+ }
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+
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+ dev_info(&pdev->dev, "Core Voltage : %d mV\n", dcdc_r8(DCDC_BIAS_VREG1) * 8);
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+
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+ return 0;
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+}
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+
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+static const struct of_device_id dcdc_match[] = {
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+ { .compatible = "lantiq,dcdc-xrx200" },
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+ {},
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+};
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+MODULE_DEVICE_TABLE(of, dcdc_match);
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+
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+static struct platform_driver dcdc_driver = {
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+ .probe = dcdc_probe,
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+ .driver = {
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+ .name = "dcdc-xrx200",
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+ .owner = THIS_MODULE,
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+ .of_match_table = dcdc_match,
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+ },
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+};
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+
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+int __init dcdc_init(void)
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+{
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+ int ret = platform_driver_register(&dcdc_driver);
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+
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+ if (ret)
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+ pr_info("dcdc: Error registering platform driver\n");
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+ return ret;
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+}
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+
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+arch_initcall(dcdc_init);
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