90 lines
2.4 KiB
Diff
90 lines
2.4 KiB
Diff
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
|
|
|
|
--- 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 +1,63 @@
|
|
+/*
|
|
+ * 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);
|