[ARM] 5477/1: Freescale STMP platform support [6/10]

Sources: common STMP3xxx platform support

Signed-off-by: dmitry pervushin <dpervushin@embeddedalley.com>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>

1 files changed, 59 insertions, 0 deletions

diff --git a/arch/arm/plat-stmp3xxx/irq.c b/arch/arm/plat-stmp3xxx/irq.c
new file mode 100644
index 000000000000..cb3659096681
--- /dev/null
+++ b/arch/arm/plat-stmp3xxx/irq.c
@@ -0,0 +1,59 @@
+/*
+ * Freescale STMP37XX/STMP378X common interrupt handling code
+ *
+ * Author: Vladislav Buzov <vbuzov@embeddedalley.com>
+ *
+ * Copyright 2008 Freescale Semiconductor, Inc. All Rights Reserved.
+ * Copyright 2008 Embedded Alley Solutions, Inc All Rights Reserved.
+ */
+
+/*
+ * The code contained herein is licensed under the GNU General Public
+ * License. You may obtain a copy of the GNU General Public License
+ * Version 2 or later at the following locations:
+ *
+ * http://www.opensource.org/licenses/gpl-license.html
+ * http://www.gnu.org/copyleft/gpl.html
+ */
+#include <linux/init.h>
+#include <linux/interrupt.h>
+#include <linux/delay.h>
+#include <linux/irq.h>
+#include <linux/sysdev.h>
+
+#include <mach/stmp3xxx.h>
+#include <mach/regs-icoll.h>
+
+void __init stmp3xxx_init_irq(struct irq_chip *chip)
+{
+        unsigned int i;
+
+        /* Reset the interrupt controller */
+        HW_ICOLL_CTRL_CLR(BM_ICOLL_CTRL_CLKGATE);
+        udelay(10);
+        HW_ICOLL_CTRL_CLR(BM_ICOLL_CTRL_SFTRST);
+        udelay(10);
+        HW_ICOLL_CTRL_SET(BM_ICOLL_CTRL_SFTRST);
+        while (!(HW_ICOLL_CTRL_RD() & BM_ICOLL_CTRL_CLKGATE))
+                continue;
+        HW_ICOLL_CTRL_CLR(BM_ICOLL_CTRL_SFTRST | BM_ICOLL_CTRL_CLKGATE);
+
+        /* Disable all interrupts initially */
+        for (i = 0; i < NR_REAL_IRQS; i++) {
+                chip->mask(i);
+                set_irq_chip(i, chip);
+                set_irq_handler(i, handle_level_irq);
+                set_irq_flags(i, IRQF_VALID | IRQF_PROBE);
+        }
+
+        /* Ensure vector is cleared */
+        HW_ICOLL_LEVELACK_WR(1);
+        HW_ICOLL_LEVELACK_WR(2);
+        HW_ICOLL_LEVELACK_WR(4);
+        HW_ICOLL_LEVELACK_WR(8);
+
+        HW_ICOLL_VECTOR_WR(0);
+        /* Barrier */
+        (void) HW_ICOLL_STAT_RD();
+}
+