diff options
author | John Crispin <blogic@openwrt.org> | 2013-08-08 14:02:23 +0200 |
---|---|---|
committer | Ralf Baechle <ralf@linux-mips.org> | 2013-09-03 23:22:15 +0200 |
commit | 45d3f186cfd04415622d49e6dbbb5b62025add3c (patch) | |
tree | 2894fc97ea227811199b00ad0edf95b4ca19b37f /arch/mips/lantiq | |
parent | MIPS: Move declaration of Octeon function fixup_irqs() to header. (diff) | |
download | linux-45d3f186cfd04415622d49e6dbbb5b62025add3c.tar.xz linux-45d3f186cfd04415622d49e6dbbb5b62025add3c.zip |
MIPS: Lantiq: Adds minimal dcdc driver
This driver so far only reads the core voltage.
Signed-off-by: John Crispin <blogic@openwrt.org>
Cc: linux-mips@linux-mips.org
Patchwork: https://patchwork.linux-mips.org/patch/5677/
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
Diffstat (limited to 'arch/mips/lantiq')
-rw-r--r-- | arch/mips/lantiq/xway/Makefile | 2 | ||||
-rw-r--r-- | arch/mips/lantiq/xway/dcdc.c | 63 |
2 files changed, 64 insertions, 1 deletions
diff --git a/arch/mips/lantiq/xway/Makefile b/arch/mips/lantiq/xway/Makefile index 7a13660d630d..087497d97357 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 000000000000..7688ac0f06d0 --- /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); |