97 lines
2.3 KiB
C
97 lines
2.3 KiB
C
/*
|
|
* linux/arch/arm/mach-omap2/prcm.c
|
|
*
|
|
* OMAP 24xx Power Reset and Clock Management (PRCM) functions
|
|
*
|
|
* Copyright (C) 2005 Nokia Corporation
|
|
*
|
|
* Written by Tony Lindgren <tony.lindgren@nokia.com>
|
|
*
|
|
* Some pieces of code Copyright (C) 2005 Texas Instruments, Inc.
|
|
*
|
|
* 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.
|
|
*/
|
|
#include <linux/module.h>
|
|
#include <linux/init.h>
|
|
#include <linux/clk.h>
|
|
#include <linux/io.h>
|
|
|
|
#include <asm/arch/common.h>
|
|
#include <asm/arch/prcm.h>
|
|
|
|
#include "clock.h"
|
|
#include "prm.h"
|
|
#include "prm-regbits-24xx.h"
|
|
|
|
static void __iomem *prm_base;
|
|
static void __iomem *cm_base;
|
|
|
|
extern void omap2_clk_prepare_for_reboot(void);
|
|
|
|
u32 omap_prcm_get_reset_sources(void)
|
|
{
|
|
return prm_read_mod_reg(WKUP_MOD, RM_RSTST) & 0x7f;
|
|
}
|
|
EXPORT_SYMBOL(omap_prcm_get_reset_sources);
|
|
|
|
/* Resets clock rates and reboots the system. Only called from system.h */
|
|
void omap_prcm_arch_reset(char mode)
|
|
{
|
|
u32 wkup;
|
|
omap2_clk_prepare_for_reboot();
|
|
|
|
if (cpu_is_omap24xx()) {
|
|
wkup = prm_read_mod_reg(WKUP_MOD, RM_RSTCTRL) | OMAP_RST_DPLL3;
|
|
prm_write_mod_reg(wkup, WKUP_MOD, RM_RSTCTRL);
|
|
}
|
|
}
|
|
|
|
static inline u32 __omap_prcm_read(void __iomem *base, s16 module, u16 reg)
|
|
{
|
|
BUG_ON(!base);
|
|
return __raw_readl(base + module + reg);
|
|
}
|
|
|
|
static inline void __omap_prcm_write(u32 value, void __iomem *base,
|
|
s16 module, u16 reg)
|
|
{
|
|
BUG_ON(!base);
|
|
__raw_writel(value, base + module + reg);
|
|
}
|
|
|
|
/* Read a register in a PRM module */
|
|
u32 prm_read_mod_reg(s16 module, u16 idx)
|
|
{
|
|
return __omap_prcm_read(prm_base, module, idx);
|
|
}
|
|
EXPORT_SYMBOL(prm_read_mod_reg);
|
|
|
|
/* Write into a register in a PRM module */
|
|
void prm_write_mod_reg(u32 val, s16 module, u16 idx)
|
|
{
|
|
__omap_prcm_write(val, prm_base, module, idx);
|
|
}
|
|
EXPORT_SYMBOL(prm_write_mod_reg);
|
|
|
|
/* Read a register in a CM module */
|
|
u32 cm_read_mod_reg(s16 module, u16 idx)
|
|
{
|
|
return __omap_prcm_read(cm_base, module, idx);
|
|
}
|
|
EXPORT_SYMBOL(cm_read_mod_reg);
|
|
|
|
/* Write into a register in a CM module */
|
|
void cm_write_mod_reg(u32 val, s16 module, u16 idx)
|
|
{
|
|
__omap_prcm_write(val, cm_base, module, idx);
|
|
}
|
|
EXPORT_SYMBOL(cm_write_mod_reg);
|
|
|
|
void __init omap2_set_globals_prcm(struct omap_globals *omap2_globals)
|
|
{
|
|
prm_base = omap2_globals->prm;
|
|
cm_base = omap2_globals->cm;
|
|
}
|