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/*
* Common INTC2 register accessors
*
* Copyright (C) 2007, 2008 Magnus Damm
* Copyright (C) 2009, 2010 Paul Mundt
*
* This file is subject to the terms and conditions of the GNU General Public
* License. See the file "COPYING" in the main directory of this archive
* for more details.
*/
#include <linux/io.h>
#include "internals.h"
unsigned long intc_phys_to_virt(struct intc_desc_int *d, unsigned long address)
{
struct intc_window *window;
int k;
/* scan through physical windows and convert address */
for (k = 0; k < d->nr_windows; k++) {
window = d->window + k;
if (address < window->phys)
continue;
if (address >= (window->phys + window->size))
continue;
address -= window->phys;
address += (unsigned long)window->virt;
return address;
}
/* no windows defined, register must be 1:1 mapped virt:phys */
return address;
}
unsigned int intc_get_reg(struct intc_desc_int *d, unsigned long address)
{
unsigned int k;
address = intc_phys_to_virt(d, address);
for (k = 0; k < d->nr_reg; k++) {
if (d->reg[k] == address)
return k;
}
BUG();
return 0;
}
unsigned int intc_set_field_from_handle(unsigned int value,
unsigned int field_value,
unsigned int handle)
{
unsigned int width = _INTC_WIDTH(handle);
unsigned int shift = _INTC_SHIFT(handle);
value &= ~(((1 << width) - 1) << shift);
value |= field_value << shift;
return value;
}
unsigned long intc_get_field_from_handle(unsigned int value, unsigned int handle)
{
unsigned int width = _INTC_WIDTH(handle);
unsigned int shift = _INTC_SHIFT(handle);
unsigned int mask = ((1 << width) - 1) << shift;
return (value & mask) >> shift;
}
static unsigned long test_8(unsigned long addr, unsigned long h,
unsigned long ignore)
{
return intc_get_field_from_handle(__raw_readb(addr), h);
}
static unsigned long test_16(unsigned long addr, unsigned long h,
unsigned long ignore)
{
return intc_get_field_from_handle(__raw_readw(addr), h);
}
static unsigned long test_32(unsigned long addr, unsigned long h,
unsigned long ignore)
{
return intc_get_field_from_handle(__raw_readl(addr), h);
}
static unsigned long write_8(unsigned long addr, unsigned long h,
unsigned long data)
{
__raw_writeb(intc_set_field_from_handle(0, data, h), addr);
(void)__raw_readb(addr); /* Defeat write posting */
return 0;
}
static unsigned long write_16(unsigned long addr, unsigned long h,
unsigned long data)
{
__raw_writew(intc_set_field_from_handle(0, data, h), addr);
(void)__raw_readw(addr); /* Defeat write posting */
return 0;
}
static unsigned long write_32(unsigned long addr, unsigned long h,
unsigned long data)
{
__raw_writel(intc_set_field_from_handle(0, data, h), addr);
(void)__raw_readl(addr); /* Defeat write posting */
return 0;
}
static unsigned long modify_8(unsigned long addr, unsigned long h,
unsigned long data)
{
unsigned long flags;
unsigned int value;
local_irq_save(flags);
value = intc_set_field_from_handle(__raw_readb(addr), data, h);
__raw_writeb(value, addr);
(void)__raw_readb(addr); /* Defeat write posting */
local_irq_restore(flags);
return 0;
}
static unsigned long modify_16(unsigned long addr, unsigned long h,
unsigned long data)
{
unsigned long flags;
unsigned int value;
local_irq_save(flags);
value = intc_set_field_from_handle(__raw_readw(addr), data, h);
__raw_writew(value, addr);
(void)__raw_readw(addr); /* Defeat write posting */
local_irq_restore(flags);
return 0;
}
static unsigned long modify_32(unsigned long addr, unsigned long h,
unsigned long data)
{
unsigned long flags;
unsigned int value;
local_irq_save(flags);
value = intc_set_field_from_handle(__raw_readl(addr), data, h);
__raw_writel(value, addr);
(void)__raw_readl(addr); /* Defeat write posting */
local_irq_restore(flags);
return 0;
}
static unsigned long intc_mode_field(unsigned long addr,
unsigned long handle,
unsigned long (*fn)(unsigned long,
unsigned long,
unsigned long),
unsigned int irq)
{
return fn(addr, handle, ((1 << _INTC_WIDTH(handle)) - 1));
}
static unsigned long intc_mode_zero(unsigned long addr,
unsigned long handle,
unsigned long (*fn)(unsigned long,
unsigned long,
unsigned long),
unsigned int irq)
{
return fn(addr, handle, 0);
}
static unsigned long intc_mode_prio(unsigned long addr,
unsigned long handle,
unsigned long (*fn)(unsigned long,
unsigned long,
unsigned long),
unsigned int irq)
{
return fn(addr, handle, intc_get_prio_level(irq));
}
unsigned long (*intc_reg_fns[])(unsigned long addr,
unsigned long h,
unsigned long data) = {
[REG_FN_TEST_BASE + 0] = test_8,
[REG_FN_TEST_BASE + 1] = test_16,
[REG_FN_TEST_BASE + 3] = test_32,
[REG_FN_WRITE_BASE + 0] = write_8,
[REG_FN_WRITE_BASE + 1] = write_16,
[REG_FN_WRITE_BASE + 3] = write_32,
[REG_FN_MODIFY_BASE + 0] = modify_8,
[REG_FN_MODIFY_BASE + 1] = modify_16,
[REG_FN_MODIFY_BASE + 3] = modify_32,
};
unsigned long (*intc_enable_fns[])(unsigned long addr,
unsigned long handle,
unsigned long (*fn)(unsigned long,
unsigned long,
unsigned long),
unsigned int irq) = {
[MODE_ENABLE_REG] = intc_mode_field,
[MODE_MASK_REG] = intc_mode_zero,
[MODE_DUAL_REG] = intc_mode_field,
[MODE_PRIO_REG] = intc_mode_prio,
[MODE_PCLR_REG] = intc_mode_prio,
};
unsigned long (*intc_disable_fns[])(unsigned long addr,
unsigned long handle,
unsigned long (*fn)(unsigned long,
unsigned long,
unsigned long),
unsigned int irq) = {
[MODE_ENABLE_REG] = intc_mode_zero,
[MODE_MASK_REG] = intc_mode_field,
[MODE_DUAL_REG] = intc_mode_field,
[MODE_PRIO_REG] = intc_mode_zero,
[MODE_PCLR_REG] = intc_mode_field,
};
unsigned long (*intc_enable_noprio_fns[])(unsigned long addr,
unsigned long handle,
unsigned long (*fn)(unsigned long,
unsigned long,
unsigned long),
unsigned int irq) = {
[MODE_ENABLE_REG] = intc_mode_field,
[MODE_MASK_REG] = intc_mode_zero,
[MODE_DUAL_REG] = intc_mode_field,
[MODE_PRIO_REG] = intc_mode_field,
[MODE_PCLR_REG] = intc_mode_field,
};
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