From mboxrd@z Thu Jan 1 00:00:00 1970 From: shawn.guo@freescale.com (Shawn Guo) Date: Thu, 9 Dec 2010 23:12:39 +0800 Subject: [PATCH v3 04/15] ARM: mxs: Add interrupt support In-Reply-To: <1290754154-9428-1-git-send-email-shawn.guo@freescale.com> References: <1290754154-9428-1-git-send-email-shawn.guo@freescale.com> Message-ID: <1291907569-8925-4-git-send-email-shawn.guo@freescale.com> To: linux-arm-kernel@lists.infradead.org List-Id: linux-arm-kernel.lists.infradead.org Add Interrupt Collector (ICOLL) support for MXS-based. Signed-off-by: Shawn Guo --- Changes for v3: - icoll.c: add #include as it's removed from mx23.h and mx28.h - Change inclusion of hardware.h to mxs.h - Move writing to HW_ICOLL_VECTOR from icoll.c icoll_ack_irq() into entry-macro.S get_irqnr_and_base - icoll.c: add more words into comments for level 0 irq ack - mx23 and mx28 share the same icoll base address, so hard-coding of the address is ok - entry-macro.S: define and use HW_ICOLL_STAT_OFFSET over 0x70 Changes for v2: - Get icoll base in get_irqnr_preamble - Check the case of single SoC build and use hard-coding address if possible arch/arm/mach-mxs/icoll.c | 81 ++++++++++++++++++++++++++ arch/arm/mach-mxs/include/mach/entry-macro.S | 41 +++++++++++++ 2 files changed, 122 insertions(+), 0 deletions(-) create mode 100644 arch/arm/mach-mxs/icoll.c create mode 100644 arch/arm/mach-mxs/include/mach/entry-macro.S diff --git a/arch/arm/mach-mxs/icoll.c b/arch/arm/mach-mxs/icoll.c new file mode 100644 index 0000000..5dd43ba --- /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); + } +} diff --git a/arch/arm/mach-mxs/include/mach/entry-macro.S b/arch/arm/mach-mxs/include/mach/entry-macro.S new file mode 100644 index 0000000..2f2a7cf --- /dev/null +++ b/arch/arm/mach-mxs/include/mach/entry-macro.S @@ -0,0 +1,41 @@ +/* + * 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 + +#define 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, =ICOLL_VBASE + .endm + + .macro arch_ret_to_user, tmp1, tmp2 + .endm -- 1.7.1