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authorDavid Howells <dhowells@redhat.com>2010-10-27 17:28:58 +0100
committerDavid Howells <dhowells@redhat.com>2010-10-27 17:28:58 +0100
commit6044cf1d9426dfd5cdc1e7b9cf8eaed6418e1ff6 (patch)
tree3f6f209d37328ce1635df8f5d0b5df1cef1afe30 /arch/mn10300/unit-asb2364
parent730c1fad0ee22a170d2ee76a904709ee304931c0 (diff)
MN10300: ASB2364: Handle the IRQ multiplexer in the FPGA
Handle the IRQ multiplexer in the FPGA by implementing a cascade interrupt driver for it. Signed-off-by: David Howells <dhowells@redhat.com>
Diffstat (limited to 'arch/mn10300/unit-asb2364')
-rw-r--r--arch/mn10300/unit-asb2364/Makefile2
-rw-r--r--arch/mn10300/unit-asb2364/include/unit/fpga-regs.h24
-rw-r--r--arch/mn10300/unit-asb2364/include/unit/irq.h35
-rw-r--r--arch/mn10300/unit-asb2364/irq-fpga.c96
-rw-r--r--arch/mn10300/unit-asb2364/unit-init.c3
5 files changed, 148 insertions, 12 deletions
diff --git a/arch/mn10300/unit-asb2364/Makefile b/arch/mn10300/unit-asb2364/Makefile
index 6dd27d65877a..e9d9b90ef6da 100644
--- a/arch/mn10300/unit-asb2364/Makefile
+++ b/arch/mn10300/unit-asb2364/Makefile
@@ -7,4 +7,4 @@
#
# Note 2! The CFLAGS definitions are now in the main makefile...
-obj-y := unit-init.o leds.o
+obj-y := unit-init.o leds.o irq-fpga.o
diff --git a/arch/mn10300/unit-asb2364/include/unit/fpga-regs.h b/arch/mn10300/unit-asb2364/include/unit/fpga-regs.h
index a039a50c91db..7cf12054db65 100644
--- a/arch/mn10300/unit-asb2364/include/unit/fpga-regs.h
+++ b/arch/mn10300/unit-asb2364/include/unit/fpga-regs.h
@@ -14,17 +14,19 @@
#define ASB2364_FPGA_REG_RESET_USB __SYSREG(0xa900130c, u16)
#define ASB2364_FPGA_REG_RESET_AV __SYSREG(0xa9001310, u16)
-#define ASB2364_FPGA_REG_IRQ_LAN __SYSREG(0xa9001510, u16)
-#define ASB2364_FPGA_REG_IRQ_UART __SYSREG(0xa9001514, u16)
-#define ASB2364_FPGA_REG_IRQ_I2C __SYSREG(0xa9001518, u16)
-#define ASB2364_FPGA_REG_IRQ_USB __SYSREG(0xa900151c, u16)
-#define ASB2364_FPGA_REG_IRQ_FPGA __SYSREG(0xa9001524, u16)
-
-#define ASB2364_FPGA_REG_MASK_LAN __SYSREG(0xa9001590, u16)
-#define ASB2364_FPGA_REG_MASK_UART __SYSREG(0xa9001594, u16)
-#define ASB2364_FPGA_REG_MASK_I2C __SYSREG(0xa9001598, u16)
-#define ASB2364_FPGA_REG_MASK_USB __SYSREG(0xa900159c, u16)
-#define ASB2364_FPGA_REG_MASK_FPGA __SYSREG(0xa90015a4, u16)
+#define ASB2364_FPGA_REG_IRQ(X) __SYSREG(0xa9001590+((X)*4), u16)
+#define ASB2364_FPGA_REG_IRQ_LAN ASB2364_FPGA_REG_IRQ(0)
+#define ASB2364_FPGA_REG_IRQ_UART ASB2364_FPGA_REG_IRQ(1)
+#define ASB2364_FPGA_REG_IRQ_I2C ASB2364_FPGA_REG_IRQ(2)
+#define ASB2364_FPGA_REG_IRQ_USB ASB2364_FPGA_REG_IRQ(3)
+#define ASB2364_FPGA_REG_IRQ_FPGA ASB2364_FPGA_REG_IRQ(5)
+
+#define ASB2364_FPGA_REG_MASK(X) __SYSREG(0xa9001590+((X)*4), u16)
+#define ASB2364_FPGA_REG_MASK_LAN ASB2364_FPGA_REG_MASK(0)
+#define ASB2364_FPGA_REG_MASK_UART ASB2364_FPGA_REG_MASK(1)
+#define ASB2364_FPGA_REG_MASK_I2C ASB2364_FPGA_REG_MASK(2)
+#define ASB2364_FPGA_REG_MASK_USB ASB2364_FPGA_REG_MASK(3)
+#define ASB2364_FPGA_REG_MASK_FPGA ASB2364_FPGA_REG_MASK(5)
#define ASB2364_FPGA_REG_CPLD5_SET1 __SYSREG(0xa9002500, u16)
#define ASB2364_FPGA_REG_CPLD5_SET2 __SYSREG(0xa9002504, u16)
diff --git a/arch/mn10300/unit-asb2364/include/unit/irq.h b/arch/mn10300/unit-asb2364/include/unit/irq.h
new file mode 100644
index 000000000000..786148e46565
--- /dev/null
+++ b/arch/mn10300/unit-asb2364/include/unit/irq.h
@@ -0,0 +1,35 @@
+/* ASB2364 FPGA irq numbers
+ *
+ * Copyright (C) 2010 Red Hat, Inc. All Rights Reserved.
+ * Written by David Howells (dhowells@redhat.com)
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public Licence
+ * as published by the Free Software Foundation; either version
+ * 2 of the Licence, or (at your option) any later version.
+ */
+#ifndef _UNIT_IRQ_H
+#define _UNIT_IRQ_H
+
+#ifndef __ASSEMBLY__
+
+#ifdef CONFIG_SMP
+#define NR_CPU_IRQS GxICR_NUM_EXT_IRQS
+#else
+#define NR_CPU_IRQS GxICR_NUM_IRQS
+#endif
+
+enum {
+ FPGA_LAN_IRQ = NR_CPU_IRQS,
+ FPGA_UART_IRQ,
+ FPGA_I2C_IRQ,
+ FPGA_USB_IRQ,
+ FPGA_RESERVED_IRQ,
+ FPGA_FPGA_IRQ,
+ NR_IRQS
+};
+
+extern void __init irq_fpga_init(void);
+
+#endif /* !__ASSEMBLY__ */
+#endif /* _UNIT_IRQ_H */
diff --git a/arch/mn10300/unit-asb2364/irq-fpga.c b/arch/mn10300/unit-asb2364/irq-fpga.c
new file mode 100644
index 000000000000..fcf29754e4d1
--- /dev/null
+++ b/arch/mn10300/unit-asb2364/irq-fpga.c
@@ -0,0 +1,96 @@
+/* ASB2364 FPGA interrupt multiplexing
+ *
+ * Copyright (C) 2010 Red Hat, Inc. All Rights Reserved.
+ * Written by David Howells (dhowells@redhat.com)
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public Licence
+ * as published by the Free Software Foundation; either version
+ * 2 of the Licence, or (at your option) any later version.
+ */
+
+#include <linux/interrupt.h>
+#include <linux/init.h>
+#include <linux/irq.h>
+#include <unit/fpga-regs.h>
+
+/*
+ * FPGA PIC operations
+ */
+static void asb2364_fpga_mask(unsigned int irq)
+{
+ ASB2364_FPGA_REG_MASK(irq - NR_CPU_IRQS) = 0x0001;
+ SyncExBus();
+}
+
+static void asb2364_fpga_ack(unsigned int irq)
+{
+ ASB2364_FPGA_REG_IRQ(irq - NR_CPU_IRQS) = 0x0001;
+ SyncExBus();
+}
+
+static void asb2364_fpga_mask_ack(unsigned int irq)
+{
+ ASB2364_FPGA_REG_MASK(irq - NR_CPU_IRQS) = 0x0001;
+ SyncExBus();
+ ASB2364_FPGA_REG_IRQ(irq - NR_CPU_IRQS) = 0x0001;
+ SyncExBus();
+}
+
+static void asb2364_fpga_unmask(unsigned int irq)
+{
+ ASB2364_FPGA_REG_MASK(irq - NR_CPU_IRQS) = 0x0000;
+ SyncExBus();
+}
+
+static struct irq_chip asb2364_fpga_pic = {
+ .name = "fpga",
+ .ack = asb2364_fpga_ack,
+ .mask = asb2364_fpga_mask,
+ .mask_ack = asb2364_fpga_mask_ack,
+ .unmask = asb2364_fpga_unmask,
+};
+
+/*
+ * FPGA PIC interrupt handler
+ */
+static irqreturn_t fpga_interrupt(int irq, void *_mask)
+{
+ if ((ASB2364_FPGA_REG_IRQ_LAN & 0x0001) != 0x0001)
+ generic_handle_irq(FPGA_LAN_IRQ);
+ if ((ASB2364_FPGA_REG_IRQ_UART & 0x0001) != 0x0001)
+ generic_handle_irq(FPGA_UART_IRQ);
+ if ((ASB2364_FPGA_REG_IRQ_I2C & 0x0001) != 0x0001)
+ generic_handle_irq(FPGA_I2C_IRQ);
+ if ((ASB2364_FPGA_REG_IRQ_USB & 0x0001) != 0x0001)
+ generic_handle_irq(FPGA_USB_IRQ);
+ if ((ASB2364_FPGA_REG_IRQ_FPGA & 0x0001) != 0x0001)
+ generic_handle_irq(FPGA_FPGA_IRQ);
+
+ return IRQ_HANDLED;
+}
+
+/*
+ * Define an interrupt action for each FPGA PIC output
+ */
+static struct irqaction fpga_irq[] = {
+ [0] = {
+ .handler = fpga_interrupt,
+ .flags = IRQF_DISABLED | IRQF_SHARED,
+ .name = "fpga",
+ },
+};
+
+/*
+ * Initialise the FPGA's PIC
+ */
+void __init irq_fpga_init(void)
+{
+ int irq;
+
+ for (irq = NR_CPU_IRQS; irq < NR_IRQS; irq++)
+ set_irq_chip_and_handler(irq, &asb2364_fpga_pic, handle_level_irq);
+
+ /* the FPGA drives the XIRQ1 input on the CPU PIC */
+ setup_irq(XIRQ1, &fpga_irq[0]);
+}
diff --git a/arch/mn10300/unit-asb2364/unit-init.c b/arch/mn10300/unit-asb2364/unit-init.c
index a3fc09b43f84..11440803db10 100644
--- a/arch/mn10300/unit-asb2364/unit-init.c
+++ b/arch/mn10300/unit-asb2364/unit-init.c
@@ -20,6 +20,7 @@
#include <asm/processor.h>
#include <asm/irq.h>
#include <asm/intctl-regs.h>
+#include <unit/fpga-regs.h>
/*
* initialise some of the unit hardware before gdbstub is set up
@@ -82,4 +83,6 @@ void __init unit_init_IRQ(void)
#define IRQCTL __SYSREG(0xd5000090, u32)
IRQCTL |= 0x02;
+
+ irq_fpga_init();
}

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