70 lines
1.7 KiB
C
70 lines
1.7 KiB
C
/*
|
|
* 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) 2010 John Crispin <blogic@openwrt.org>
|
|
*/
|
|
|
|
#include <linux/kernel.h>
|
|
#include <linux/module.h>
|
|
#include <linux/ioport.h>
|
|
|
|
#include <lantiq_soc.h>
|
|
|
|
/* PMU - the power management unit allows us to turn part of the core
|
|
* on and off
|
|
*/
|
|
|
|
/* the enable / disable registers */
|
|
#define LTQ_PMU_PWDCR 0x1C
|
|
#define LTQ_PMU_PWDSR 0x20
|
|
|
|
#define ltq_pmu_w32(x, y) ltq_w32((x), ltq_pmu_membase + (y))
|
|
#define ltq_pmu_r32(x) ltq_r32(ltq_pmu_membase + (x))
|
|
|
|
static struct resource ltq_pmu_resource = {
|
|
.name = "pmu",
|
|
.start = LTQ_PMU_BASE_ADDR,
|
|
.end = LTQ_PMU_BASE_ADDR + LTQ_PMU_SIZE - 1,
|
|
.flags = IORESOURCE_MEM,
|
|
};
|
|
|
|
static void __iomem *ltq_pmu_membase;
|
|
|
|
void ltq_pmu_enable(unsigned int module)
|
|
{
|
|
int err = 1000000;
|
|
|
|
ltq_pmu_w32(ltq_pmu_r32(LTQ_PMU_PWDCR) & ~module, LTQ_PMU_PWDCR);
|
|
do {} while (--err && (ltq_pmu_r32(LTQ_PMU_PWDSR) & module));
|
|
|
|
if (!err)
|
|
panic("activating PMU module failed!");
|
|
}
|
|
EXPORT_SYMBOL(ltq_pmu_enable);
|
|
|
|
void ltq_pmu_disable(unsigned int module)
|
|
{
|
|
ltq_pmu_w32(ltq_pmu_r32(LTQ_PMU_PWDCR) | module, LTQ_PMU_PWDCR);
|
|
}
|
|
EXPORT_SYMBOL(ltq_pmu_disable);
|
|
|
|
int __init ltq_pmu_init(void)
|
|
{
|
|
if (insert_resource(&iomem_resource, <q_pmu_resource) < 0)
|
|
panic("Failed to insert pmu memory");
|
|
|
|
if (request_mem_region(ltq_pmu_resource.start,
|
|
resource_size(<q_pmu_resource), "pmu") < 0)
|
|
panic("Failed to request pmu memory");
|
|
|
|
ltq_pmu_membase = ioremap_nocache(ltq_pmu_resource.start,
|
|
resource_size(<q_pmu_resource));
|
|
if (!ltq_pmu_membase)
|
|
panic("Failed to remap pmu memory");
|
|
return 0;
|
|
}
|
|
|
|
core_initcall(ltq_pmu_init);
|