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/*
* 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 <mach/common.h>
#include <mach/prcm.h>
#include "clock.h"
#include "prm.h"
#include "prm-regbits-24xx.h"
static void __iomem *prm_base;
static void __iomem *cm_base;
u32 omap_prcm_get_reset_sources(void)
{
/* XXX This presumably needs modification for 34XX */
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)
{
s16 prcm_offs;
omap2_clk_prepare_for_reboot();
if (cpu_is_omap24xx())
prcm_offs = WKUP_MOD;
else if (cpu_is_omap34xx())
prcm_offs = OMAP3430_GR_MOD;
else
WARN_ON(1);
prm_set_mod_reg_bits(OMAP_RST_DPLL3, prcm_offs, 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-modify-write a register in a PRM module. Caller must lock */
u32 prm_rmw_mod_reg_bits(u32 mask, u32 bits, s16 module, s16 idx)
{
u32 v;
v = prm_read_mod_reg(module, idx);
v &= ~mask;
v |= bits;
prm_write_mod_reg(v, module, idx);
return v;
}
EXPORT_SYMBOL(prm_rmw_mod_reg_bits);
/* 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);
/* Read-modify-write a register in a CM module. Caller must lock */
u32 cm_rmw_mod_reg_bits(u32 mask, u32 bits, s16 module, s16 idx)
{
u32 v;
v = cm_read_mod_reg(module, idx);
v &= ~mask;
v |= bits;
cm_write_mod_reg(v, module, idx);
return v;
}
EXPORT_SYMBOL(cm_rmw_mod_reg_bits);
void __init omap2_set_globals_prcm(struct omap_globals *omap2_globals)
{
prm_base = omap2_globals->prm;
cm_base = omap2_globals->cm;
}
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