Linux-2.6.12-rc2
Initial git repository build. I'm not bothering with the full history,
even though we have it. We can create a separate "historical" git
archive of that later if we want to, and in the meantime it's about
3.2GB when imported into git - space that would just make the early
git days unnecessarily complicated, when we don't have a lot of good
infrastructure for it.
Let it rip!
diff --git a/arch/frv/kernel/irq-mb93091.c b/arch/frv/kernel/irq-mb93091.c
new file mode 100644
index 0000000..9778e0f
--- /dev/null
+++ b/arch/frv/kernel/irq-mb93091.c
@@ -0,0 +1,116 @@
+/* irq-mb93091.c: MB93091 FPGA interrupt handling
+ *
+ * Copyright (C) 2003 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 License
+ * as published by the Free Software Foundation; either version
+ * 2 of the License, or (at your option) any later version.
+ */
+
+#include <linux/config.h>
+#include <linux/ptrace.h>
+#include <linux/errno.h>
+#include <linux/signal.h>
+#include <linux/sched.h>
+#include <linux/ioport.h>
+#include <linux/interrupt.h>
+#include <linux/init.h>
+#include <linux/irq.h>
+
+#include <asm/io.h>
+#include <asm/system.h>
+#include <asm/bitops.h>
+#include <asm/delay.h>
+#include <asm/irq.h>
+#include <asm/irc-regs.h>
+#include <asm/irq-routing.h>
+
+#define __reg16(ADDR) (*(volatile unsigned short *)(ADDR))
+
+#define __get_IMR() ({ __reg16(0xffc00004); })
+#define __set_IMR(M) do { __reg16(0xffc00004) = (M); wmb(); } while(0)
+#define __get_IFR() ({ __reg16(0xffc0000c); })
+#define __clr_IFR(M) do { __reg16(0xffc0000c) = ~(M); wmb(); } while(0)
+
+static void frv_fpga_doirq(struct irq_source *source);
+static void frv_fpga_control(struct irq_group *group, int irq, int on);
+
+/*****************************************************************************/
+/*
+ * FPGA IRQ multiplexor
+ */
+static struct irq_source frv_fpga[4] = {
+#define __FPGA(X, M) \
+ [X] = { \
+ .muxname = "fpga."#X, \
+ .irqmask = M, \
+ .doirq = frv_fpga_doirq, \
+ }
+
+ __FPGA(0, 0x0028),
+ __FPGA(1, 0x0050),
+ __FPGA(2, 0x1c00),
+ __FPGA(3, 0x6386),
+};
+
+static struct irq_group frv_fpga_irqs = {
+ .first_irq = IRQ_BASE_FPGA,
+ .control = frv_fpga_control,
+ .sources = {
+ [ 1] = &frv_fpga[3],
+ [ 2] = &frv_fpga[3],
+ [ 3] = &frv_fpga[0],
+ [ 4] = &frv_fpga[1],
+ [ 5] = &frv_fpga[0],
+ [ 6] = &frv_fpga[1],
+ [ 7] = &frv_fpga[3],
+ [ 8] = &frv_fpga[3],
+ [ 9] = &frv_fpga[3],
+ [10] = &frv_fpga[2],
+ [11] = &frv_fpga[2],
+ [12] = &frv_fpga[2],
+ [13] = &frv_fpga[3],
+ [14] = &frv_fpga[3],
+ },
+};
+
+
+static void frv_fpga_control(struct irq_group *group, int index, int on)
+{
+ uint16_t imr = __get_IMR();
+
+ if (on)
+ imr &= ~(1 << index);
+ else
+ imr |= 1 << index;
+
+ __set_IMR(imr);
+}
+
+static void frv_fpga_doirq(struct irq_source *source)
+{
+ uint16_t mask, imr;
+
+ imr = __get_IMR();
+ mask = source->irqmask & ~imr & __get_IFR();
+ if (mask) {
+ __set_IMR(imr | mask);
+ __clr_IFR(mask);
+ distribute_irqs(&frv_fpga_irqs, mask);
+ __set_IMR(imr);
+ }
+}
+
+void __init fpga_init(void)
+{
+ __set_IMR(0x7ffe);
+ __clr_IFR(0x0000);
+
+ frv_irq_route_external(&frv_fpga[0], IRQ_CPU_EXTERNAL0);
+ frv_irq_route_external(&frv_fpga[1], IRQ_CPU_EXTERNAL1);
+ frv_irq_route_external(&frv_fpga[2], IRQ_CPU_EXTERNAL2);
+ frv_irq_route_external(&frv_fpga[3], IRQ_CPU_EXTERNAL3);
+ frv_irq_set_group(&frv_fpga_irqs);
+}