From 289569f902dc70fc42b8c7cab627f9d615a720f1 Mon Sep 17 00:00:00 2001 From: Shawn Guo Date: Sat, 18 Dec 2010 21:39:28 +0800 Subject: ARM: mxs: Add interrupt support MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Add Interrupt Collector (ICOLL) support for MXS-based. Signed-off-by: Shawn Guo Signed-off-by: Uwe Kleine-König --- arch/arm/mach-mxs/icoll.c | 81 +++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 81 insertions(+) create mode 100644 arch/arm/mach-mxs/icoll.c (limited to 'arch/arm/mach-mxs/icoll.c') diff --git a/arch/arm/mach-mxs/icoll.c b/arch/arm/mach-mxs/icoll.c new file mode 100644 index 00000000000..5dd43ba7005 --- /dev/null +++ b/arch/arm/mach-mxs/icoll.c @@ -0,0 +1,81 @@ +/* + * 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 +#include +#include +#include + +#include +#include + +#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); + } +} -- cgit v1.2.3