[PATCH v3 04/15] ARM: mxs: Add interrupt support
Shawn Guo
shawn.guo at freescale.com
Thu Dec 9 10:12:39 EST 2010
Add Interrupt Collector (ICOLL) support for MXS-based.
Signed-off-by: Shawn Guo <shawn.guo at freescale.com>
---
Changes for v3:
- icoll.c: add #include <linux/io.h> 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 <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);
+ }
+}
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 <mach/mxs.h>
+
+#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
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