aaf9128abc
Update license to use SPDX-License-Identifier instead of verbose license text. Link: http://lkml.kernel.org/r/87in08ct0n.wl-kuninori.morimoto.gx@renesas.com Signed-off-by: Kuninori Morimoto <kuninori.morimoto.gx@renesas.com> Reviewed-by: Simon Horman <horms+renesas@verge.net.au> Cc: Rich Felker <dalias@libc.org> Cc: Yoshinori Sato <ysato@users.sourceforge.jp> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
157 lines
4.0 KiB
C
157 lines
4.0 KiB
C
// SPDX-License-Identifier: GPL-2.0
|
|
/*
|
|
* arch/sh/boards/mach-x3proto/ilsel.c
|
|
*
|
|
* Helper routines for SH-X3 proto board ILSEL.
|
|
*
|
|
* Copyright (C) 2007 - 2010 Paul Mundt
|
|
*/
|
|
#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
|
|
|
|
#include <linux/init.h>
|
|
#include <linux/kernel.h>
|
|
#include <linux/module.h>
|
|
#include <linux/bitmap.h>
|
|
#include <linux/io.h>
|
|
#include <mach/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;
|
|
|
|
pr_notice("enabling ILSEL set %d\n", set);
|
|
|
|
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;
|
|
|
|
if (unlikely(set > ILSEL_KEY)) {
|
|
pr_err("Aliased sources must use ilsel_enable_fixed()\n");
|
|
return -EINVAL;
|
|
}
|
|
|
|
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;
|
|
|
|
pr_notice("disabling ILSEL set %d\n", irq);
|
|
|
|
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);
|