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/*
* linux/arch/arm/mach-pxa/mfp.c
*
* PXA3xx Multi-Function Pin Support
*
* Copyright (C) 2007 Marvell Internation Ltd.
*
* 2007-08-21: eric miao <eric.miao@marvell.com>
* initial version
*
* 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/kernel.h>
#include <linux/init.h>
#include <linux/io.h>
#include <asm/hardware.h>
#include <asm/arch/mfp.h>
/* mfp_spin_lock is used to ensure that MFP register configuration
* (most likely a read-modify-write operation) is atomic, and that
* mfp_table[] is consistent
*/
static DEFINE_SPINLOCK(mfp_spin_lock);
static void __iomem *mfpr_mmio_base = (void __iomem *)&__REG(MFPR_BASE);
static struct pxa3xx_mfp_pin mfp_table[MFP_PIN_MAX];
#define mfpr_readl(off) \
__raw_readl(mfpr_mmio_base + (off))
#define mfpr_writel(off, val) \
__raw_writel(val, mfpr_mmio_base + (off))
/*
* perform a read-back of any MFPR register to make sure the
* previous writings are finished
*/
#define mfpr_sync() (void)__raw_readl(mfpr_mmio_base + 0)
static inline void __mfp_config(int pin, unsigned long val)
{
unsigned long off = mfp_table[pin].mfpr_off;
mfp_table[pin].mfpr_val = val;
mfpr_writel(off, val);
}
void pxa3xx_mfp_config(mfp_cfg_t *mfp_cfgs, int num)
{
int i, pin;
unsigned long val, flags;
mfp_cfg_t *mfp_cfg = mfp_cfgs;
spin_lock_irqsave(&mfp_spin_lock, flags);
for (i = 0; i < num; i++, mfp_cfg++) {
pin = MFP_CFG_PIN(*mfp_cfg);
val = MFP_CFG_VAL(*mfp_cfg);
BUG_ON(pin >= MFP_PIN_MAX);
__mfp_config(pin, val);
}
mfpr_sync();
spin_unlock_irqrestore(&mfp_spin_lock, flags);
}
unsigned long pxa3xx_mfp_read(int mfp)
{
unsigned long val, flags;
BUG_ON(mfp >= MFP_PIN_MAX);
spin_lock_irqsave(&mfp_spin_lock, flags);
val = mfpr_readl(mfp_table[mfp].mfpr_off);
spin_unlock_irqrestore(&mfp_spin_lock, flags);
return val;
}
void pxa3xx_mfp_write(int mfp, unsigned long val)
{
unsigned long flags;
BUG_ON(mfp >= MFP_PIN_MAX);
spin_lock_irqsave(&mfp_spin_lock, flags);
mfpr_writel(mfp_table[mfp].mfpr_off, val);
mfpr_sync();
spin_unlock_irqrestore(&mfp_spin_lock, flags);
}
void __init pxa3xx_mfp_init_addr(struct pxa3xx_mfp_addr_map *map)
{
struct pxa3xx_mfp_addr_map *p;
unsigned long offset, flags;
int i;
spin_lock_irqsave(&mfp_spin_lock, flags);
for (p = map; p->start != MFP_PIN_INVALID; p++) {
offset = p->offset;
i = p->start;
do {
mfp_table[i].mfpr_off = offset;
mfp_table[i].mfpr_val = 0;
offset += 4; i++;
} while ((i <= p->end) && (p->end != -1));
}
spin_unlock_irqrestore(&mfp_spin_lock, flags);
}
void __init pxa3xx_init_mfp(void)
{
memset(mfp_table, 0, sizeof(mfp_table));
}
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