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ARM: mxs: Add interrupt support 

Add Interrupt Collector (ICOLL) support for MXS-based.

Signed-off-by: Shawn Guo <shawn.guo@freescale.com>
Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
This commit is contained in:
Shawn Guo 2010-12-18 21:39:28 +08:00 committed by Uwe Kleine-König
parent 65d7d94405
commit 289569f902
2 changed files with 122 additions and 0 deletions
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81
arch/arm/mach-mxs/icoll.c Normal file
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/*
* Copyright (C) 2009-2010 Freescale Semiconductor, Inc. All Rights Reserved.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License along
* with this program; if not, write to the Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/
#include <linux/kernel.h>
#include <linux/init.h>
#include <linux/irq.h>
#include <linux/io.h>
#include <mach/mxs.h>
#include <mach/common.h>
#define HW_ICOLL_VECTOR 0x0000
#define HW_ICOLL_LEVELACK 0x0010
#define HW_ICOLL_CTRL 0x0020
#define HW_ICOLL_INTERRUPTn_SET(n) (0x0124 + (n) * 0x10)
#define HW_ICOLL_INTERRUPTn_CLR(n) (0x0128 + (n) * 0x10)
#define BM_ICOLL_INTERRUPTn_ENABLE 0x00000004
#define BV_ICOLL_LEVELACK_IRQLEVELACK__LEVEL0 0x1
static void __iomem *icoll_base = MXS_IO_ADDRESS(MXS_ICOLL_BASE_ADDR);
static void icoll_ack_irq(unsigned int irq)
{
/*
* The Interrupt Collector is able to prioritize irqs.
* Currently only level 0 is used. So acking can use
* BV_ICOLL_LEVELACK_IRQLEVELACK__LEVEL0 unconditionally.
*/
__raw_writel(BV_ICOLL_LEVELACK_IRQLEVELACK__LEVEL0,
icoll_base + HW_ICOLL_LEVELACK);
}
static void icoll_mask_irq(unsigned int irq)
{
__raw_writel(BM_ICOLL_INTERRUPTn_ENABLE,
icoll_base + HW_ICOLL_INTERRUPTn_CLR(irq));
}
static void icoll_unmask_irq(unsigned int irq)
{
__raw_writel(BM_ICOLL_INTERRUPTn_ENABLE,
icoll_base + HW_ICOLL_INTERRUPTn_SET(irq));
}
static struct irq_chip mxs_icoll_chip = {
.ack = icoll_ack_irq,
.mask = icoll_mask_irq,
.unmask = icoll_unmask_irq,
};
void __init icoll_init_irq(void)
{
int i;
/*
* Interrupt Collector reset, which initializes the priority
* for each irq to level 0.
*/
mxs_reset_block(icoll_base + HW_ICOLL_CTRL);
for (i = 0; i < MXS_INTERNAL_IRQS; i++) {
set_irq_chip(i, &mxs_icoll_chip);
set_irq_handler(i, handle_level_irq);
set_irq_flags(i, IRQF_VALID);
}
}

41
arch/arm/mach-mxs/include/mach/entry-macro.S Normal file
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/*
* Low-level IRQ helper macros for Freescale MXS-based
*
* Copyright (C) 2009-2010 Freescale Semiconductor, Inc. All Rights Reserved.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License along
* with this program; if not, write to the Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/
#include <mach/mxs.h>
#define MXS_ICOLL_VBASE MXS_IO_ADDRESS(MXS_ICOLL_BASE_ADDR)
#define HW_ICOLL_STAT_OFFSET 0x70
.macro disable_fiq
.endm
.macro get_irqnr_and_base, irqnr, irqstat, base, tmp
ldr \irqnr, [\base, #HW_ICOLL_STAT_OFFSET]
cmp \irqnr, #0x7F
strne \irqnr, [\base]
moveqs \irqnr, #0
.endm
.macro get_irqnr_preamble, base, tmp
ldr \base, =MXS_ICOLL_VBASE
.endm
.macro arch_ret_to_user, tmp1, tmp2
.endm