mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/chenhuacai/linux-loongson
synced 2025-10-31 03:13:59 +00:00
9d56dd3b08
The old ctrl in/out routines are non-portable and unsuitable for cross-platform use. While drivers/sh has already been sanitized, there is still quite a lot of code that is not. This converts the arch/sh/ bits over, which permits us to flag the routines as deprecated whilst still building with -Werror for the architecture code, and to ensure that future users are not added. Signed-off-by: Paul Mundt <lethal@linux-sh.org>
152 lines
3.9 KiB
C
152 lines
3.9 KiB
C
/*
|
|
* arch/sh/boards/renesas/x3proto/ilsel.c
|
|
*
|
|
* Helper routines for SH-X3 proto board ILSEL.
|
|
*
|
|
* Copyright (C) 2007 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/init.h>
|
|
#include <linux/kernel.h>
|
|
#include <linux/module.h>
|
|
#include <linux/bitmap.h>
|
|
#include <linux/io.h>
|
|
#include <asm/ilsel.h>
|
|
|
|
/*
|
|
* ILSEL is split across:
|
|
*
|
|
* ILSEL0 - 0xb8100004 [ Levels 1 - 4 ]
|
|
* ILSEL1 - 0xb8100006 [ Levels 5 - 8 ]
|
|
* ILSEL2 - 0xb8100008 [ Levels 9 - 12 ]
|
|
* ILSEL3 - 0xb810000a [ Levels 13 - 15 ]
|
|
*
|
|
* With each level being relative to an ilsel_source_t.
|
|
*/
|
|
#define ILSEL_BASE 0xb8100004
|
|
#define ILSEL_LEVELS 15
|
|
|
|
/*
|
|
* ILSEL level map, in descending order from the highest level down.
|
|
*
|
|
* Supported levels are 1 - 15 spread across ILSEL0 - ILSEL4, mapping
|
|
* directly to IRLs. As the IRQs are numbered in reverse order relative
|
|
* to the interrupt level, the level map is carefully managed to ensure a
|
|
* 1:1 mapping between the bit position and the IRQ number.
|
|
*
|
|
* This careful constructions allows ilsel_enable*() to be referenced
|
|
* directly for hooking up an ILSEL set and getting back an IRQ which can
|
|
* subsequently be used for internal accounting in the (optional) disable
|
|
* path.
|
|
*/
|
|
static unsigned long ilsel_level_map;
|
|
|
|
static inline unsigned int ilsel_offset(unsigned int bit)
|
|
{
|
|
return ILSEL_LEVELS - bit - 1;
|
|
}
|
|
|
|
static inline unsigned long mk_ilsel_addr(unsigned int bit)
|
|
{
|
|
return ILSEL_BASE + ((ilsel_offset(bit) >> 1) & ~0x1);
|
|
}
|
|
|
|
static inline unsigned int mk_ilsel_shift(unsigned int bit)
|
|
{
|
|
return (ilsel_offset(bit) & 0x3) << 2;
|
|
}
|
|
|
|
static void __ilsel_enable(ilsel_source_t set, unsigned int bit)
|
|
{
|
|
unsigned int tmp, shift;
|
|
unsigned long addr;
|
|
|
|
addr = mk_ilsel_addr(bit);
|
|
shift = mk_ilsel_shift(bit);
|
|
|
|
pr_debug("%s: bit#%d: addr - 0x%08lx (shift %d, set %d)\n",
|
|
__func__, bit, addr, shift, set);
|
|
|
|
tmp = __raw_readw(addr);
|
|
tmp &= ~(0xf << shift);
|
|
tmp |= set << shift;
|
|
__raw_writew(tmp, addr);
|
|
}
|
|
|
|
/**
|
|
* ilsel_enable - Enable an ILSEL set.
|
|
* @set: ILSEL source (see ilsel_source_t enum in include/asm-sh/ilsel.h).
|
|
*
|
|
* Enables a given non-aliased ILSEL source (<= ILSEL_KEY) at the highest
|
|
* available interrupt level. Callers should take care to order callsites
|
|
* noting descending interrupt levels. Aliasing FPGA and external board
|
|
* IRQs need to use ilsel_enable_fixed().
|
|
*
|
|
* The return value is an IRQ number that can later be taken down with
|
|
* ilsel_disable().
|
|
*/
|
|
int ilsel_enable(ilsel_source_t set)
|
|
{
|
|
unsigned int bit;
|
|
|
|
/* Aliased sources must use ilsel_enable_fixed() */
|
|
BUG_ON(set > ILSEL_KEY);
|
|
|
|
do {
|
|
bit = find_first_zero_bit(&ilsel_level_map, ILSEL_LEVELS);
|
|
} while (test_and_set_bit(bit, &ilsel_level_map));
|
|
|
|
__ilsel_enable(set, bit);
|
|
|
|
return bit;
|
|
}
|
|
EXPORT_SYMBOL_GPL(ilsel_enable);
|
|
|
|
/**
|
|
* ilsel_enable_fixed - Enable an ILSEL set at a fixed interrupt level
|
|
* @set: ILSEL source (see ilsel_source_t enum in include/asm-sh/ilsel.h).
|
|
* @level: Interrupt level (1 - 15)
|
|
*
|
|
* Enables a given ILSEL source at a fixed interrupt level. Necessary
|
|
* both for level reservation as well as for aliased sources that only
|
|
* exist on special ILSEL#s.
|
|
*
|
|
* Returns an IRQ number (as ilsel_enable()).
|
|
*/
|
|
int ilsel_enable_fixed(ilsel_source_t set, unsigned int level)
|
|
{
|
|
unsigned int bit = ilsel_offset(level - 1);
|
|
|
|
if (test_and_set_bit(bit, &ilsel_level_map))
|
|
return -EBUSY;
|
|
|
|
__ilsel_enable(set, bit);
|
|
|
|
return bit;
|
|
}
|
|
EXPORT_SYMBOL_GPL(ilsel_enable_fixed);
|
|
|
|
/**
|
|
* ilsel_disable - Disable an ILSEL set
|
|
* @irq: Bit position for ILSEL set value (retval from enable routines)
|
|
*
|
|
* Disable a previously enabled ILSEL set.
|
|
*/
|
|
void ilsel_disable(unsigned int irq)
|
|
{
|
|
unsigned long addr;
|
|
unsigned int tmp;
|
|
|
|
addr = mk_ilsel_addr(irq);
|
|
|
|
tmp = __raw_readw(addr);
|
|
tmp &= ~(0xf << mk_ilsel_shift(irq));
|
|
__raw_writew(tmp, addr);
|
|
|
|
clear_bit(irq, &ilsel_level_map);
|
|
}
|
|
EXPORT_SYMBOL_GPL(ilsel_disable);
|