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authorThomas Bushnell <thomas@gnu.org>1999-04-26 05:43:44 +0000
committerThomas Bushnell <thomas@gnu.org>1999-04-26 05:43:44 +0000
commit1007688e7015f5e8d37743353ca153391120feb3 (patch)
tree0ab7a5736bf8e59bf1ae2423148e95ba534aaf22 /linux/dev/drivers/net/auto_irq.c
parent0a3806e7f01847f070bc41d00f37fa4c5b84aa73 (diff)
1998-11-30 OKUJI Yoshinori <okuji@kuicr.kyoto-u.ac.jp>
Clean up linux emulation code to make it architecture-independent as much as possible. * linux: Renamed from linuxdev. * Makefile.in (objfiles): Add linux.o instead of linuxdev.o. (MAKE): New variable. Used for the linux.o target. * configure.in: Add AC_CHECK_TOOL(MAKE, make). * i386/i386/spl.h: Include <i386/ipl.h>, for compatibility with OSF Mach 3.0. Suggested by Elgin Lee <ehl@funghi.com>. * linux/src: Renamed from linux/linux. * linux/dev: Renamed from linux/mach. * linux/Drivers.in (AC_INIT): Use dev/include/linux/autoconf.h, instead of mach/include/linux/autoconf.h. * Makefile.in (all): Target ../linux.o instead of ../linuxdev.o. * linux/dev/drivers/block/genhd.c: Include <machine/spl.h> instead of <i386/ipl.h>. * linux/dev/drivers/net/auto_irq.c: Remove unneeded header files, <i386/ipl.h> and <i386/pic.h>. * linux/dev/init/main.c: Many i386-dependent codes moved to ... * linux/dev/arch/i386/irq.c: ... here. * linux/dev/arch/i386/setup.c: New file. * linux/dev/arch/i386/linux_emul.h: Likewise. * linux/dev/arch/i386/glue/timer.c: Merged into sched.c. * linux/dev/arch/i386/glue/sched.c: Include <machine/spl.h> instead of <i386/ipl.h>, and moved to ... * linux/dev/kernel/sched.c: ... here. * linux/dev/arch/i386/glue/block.c: Include <machine/spl.h> and <linux_emul.h>, instead of i386-dependent header files, and moved to ... * linux/dev/glue/blocl.c: ... here. * linux/dev/arch/i386/glue/net.c: Include <machine/spl.h> and <linux_emul.h>, instead of i386-dependent header files, and moved to ... * linux/dev/glue/net.c: ... here. * linux/dev/arch/i386/glue/misc.c: Remove `x86' and moved to ... * linux/dev/glue/misc.c: ... here. * linux/dev/arch/i386/glue/kmem.c: Moved to ... * linux/dev/glue/kmem.c: ... here.
Diffstat (limited to 'linux/dev/drivers/net/auto_irq.c')
-rw-r--r--linux/dev/drivers/net/auto_irq.c123
1 files changed, 123 insertions, 0 deletions
diff --git a/linux/dev/drivers/net/auto_irq.c b/linux/dev/drivers/net/auto_irq.c
new file mode 100644
index 0000000..73cfe34
--- /dev/null
+++ b/linux/dev/drivers/net/auto_irq.c
@@ -0,0 +1,123 @@
+/* auto_irq.c: Auto-configure IRQ lines for linux. */
+/*
+ Written 1994 by Donald Becker.
+
+ The author may be reached as becker@CESDIS.gsfc.nasa.gov, or C/O
+ Center of Excellence in Space Data and Information Sciences
+ Code 930.5, Goddard Space Flight Center, Greenbelt MD 20771
+
+ This code is a general-purpose IRQ line detector for devices with
+ jumpered IRQ lines. If you can make the device raise an IRQ (and
+ that IRQ line isn't already being used), these routines will tell
+ you what IRQ line it's using -- perfect for those oh-so-cool boot-time
+ device probes!
+
+ To use this, first call autoirq_setup(timeout). TIMEOUT is how many
+ 'jiffies' (1/100 sec.) to detect other devices that have active IRQ lines,
+ and can usually be zero at boot. 'autoirq_setup()' returns the bit
+ vector of nominally-available IRQ lines (lines may be physically in-use,
+ but not yet registered to a device).
+ Next, set up your device to trigger an interrupt.
+ Finally call autoirq_report(TIMEOUT) to find out which IRQ line was
+ most recently active. The TIMEOUT should usually be zero, but may
+ be set to the number of jiffies to wait for a slow device to raise an IRQ.
+
+ The idea of using the setup timeout to filter out bogus IRQs came from
+ the serial driver.
+ */
+
+
+#ifdef version
+static const char *version =
+"auto_irq.c:v1.11 Donald Becker (becker@cesdis.gsfc.nasa.gov)";
+#endif
+
+#include <sys/types.h>
+#include <mach/mach_types.h>
+#include <mach/vm_param.h>
+
+#define MACH_INCLUDE
+#include <linux/sched.h>
+#include <linux/delay.h>
+#include <asm/bitops.h>
+#include <asm/io.h>
+#include <asm/irq.h>
+#include <linux/netdevice.h>
+
+void *irq2dev_map[NR_IRQS] = {0, 0, /* ... zeroed */ };
+
+unsigned long irqs_busy = 0x2147; /* The set of fixed IRQs (keyboard, timer, etc) */
+unsigned long irqs_used = 0x0001; /* The set of fixed IRQs sometimes enabled. */
+unsigned long irqs_reserved = 0x0000; /* An advisory "reserved" table. */
+unsigned long irqs_shared = 0x0000; /* IRQ lines "shared" among conforming cards. */
+
+static volatile unsigned long irq_bitmap; /* The irqs we actually found. */
+static unsigned long irq_handled; /* The irq lines we have a handler on. */
+static volatile int irq_number; /* The latest irq number we actually found. */
+
+static void
+autoirq_probe (int irq, void *dev_id, struct pt_regs *regs)
+{
+ irq_number = irq;
+ set_bit (irq, (void *) &irq_bitmap); /* irq_bitmap |= 1 << irq; */
+ /* This code used to disable the irq. However, the interrupt stub
+ * would then re-enable the interrupt with (potentially) disastrous
+ * consequences
+ */
+ free_irq (irq, dev_id);
+ return;
+}
+
+int
+autoirq_setup (int waittime)
+{
+ int i;
+ unsigned long timeout = jiffies + waittime;
+ unsigned long boguscount = (waittime * loops_per_sec) / 100;
+
+ irq_handled = 0;
+ irq_bitmap = 0;
+
+ for (i = 0; i < 16; i++)
+ {
+ if (test_bit (i, &irqs_busy) == 0
+ && request_irq (i, autoirq_probe, SA_INTERRUPT, "irq probe", NULL) == 0)
+ set_bit (i, (void *) &irq_handled); /* irq_handled |= 1 << i; */
+ }
+ /* Update our USED lists. */
+ irqs_used |= ~irq_handled;
+
+ /* Hang out at least <waittime> jiffies waiting for bogus IRQ hits. */
+ while (timeout > jiffies && --boguscount > 0)
+ ;
+
+ irq_handled &= ~irq_bitmap;
+
+ irq_number = 0; /* We are interested in new interrupts from now on */
+
+ return irq_handled;
+}
+
+int
+autoirq_report (int waittime)
+{
+ int i;
+ unsigned long timeout = jiffies + waittime;
+ unsigned long boguscount = (waittime * loops_per_sec) / 100;
+
+ /* Hang out at least <waittime> jiffies waiting for the IRQ. */
+
+ while (timeout > jiffies && --boguscount > 0)
+ if (irq_number)
+ break;
+
+ irq_handled &= ~irq_bitmap; /* This eliminates the already reset handlers */
+
+ /* Retract the irq handlers that we installed. */
+ for (i = 0; i < 16; i++)
+ {
+ if (test_bit (i, (void *) &irq_handled))
+ free_irq (i, NULL);
+ }
+ return irq_number;
+}