From 3aa46ed76b27df771f75db9c74ff011aca505fc5 Mon Sep 17 00:00:00 2001 From: John Crispin Date: Wed, 5 Dec 2012 17:38:48 +0100 Subject: [PATCH 106/123] MIPS: lantiq: adds minimal dcdc driver This driver so far only reads the core voltage. Signed-off-by: John Crispin --- 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 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..0ac73a5 --- /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 + * Copyright (C) 2010 Sameer Ahmad, Lantiq GmbH + */ + +#include +#include +#include +#include +#include + +#include + +/* 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 __devinit 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); -- 1.7.10.4