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>

2 files changed, 122 insertions, 0 deletions

diff --git a/arch/arm/mach-mxs/icoll.c b/arch/arm/mach-mxs/icoll.c
new file mode 100644
index 000000000000..5dd43ba70058
--- /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 000000000000..9f0da12e657a
--- /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 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