[etherlab-dev] Generic driver for kernel 2.6.16

[Oliver Schweikert]

Hello,

I wanted to test the ethercat master with a unsupported hardware and software combination:
Broadcom controller, bnx2 driver with SLES10, kernel 2.6.16. 
To use the generic driver I had to make some modifications, which are appended to this message.
It is not heavy tested and not even gracefull, but principally it works.
It compiles with a 2.6.32 kernel, too.
Maybe it is useful for anybody else...

BTW: I had to bring up the used ethernet interface, manually. Is there a way to do this automatically
in the generic driver?

Regards,
Oliver

-- 
Oliver Schweikert
Software Development

HORIBA Europe Automation Division GmbH
Zabergäustr. 3
73765 Neuhausen (Germany)
Tel: +49 7158-933-413
Fax: +49 7158-933-613
Email: oliver.schweikert at horiba.com

Geschäftsführer: Thomas E. Ehmann, Yuichi Muroga, Takashi Nagano
Amtsgericht Stuttgart, HRB 213200


diff -r e9f722488fcd devices/generic.c
--- a/devices/generic.c Mon Oct 25 17:06:45 2010 +0200
+++ b/devices/generic.c Thu Nov 18 13:35:37 2010 +0100
@@ -64,6 +64,53 @@
 MODULE_VERSION(EC_MASTER_VERSION);
 
 /** \endcond */
+/** Don't know when kernel_bind and for_each_netdev were introduced,
+ * but they're contained in 2.6.25 and are missing in 2.6.17
+ */
+#if LINUX_VERSION_CODE < KERNEL_VERSION(2, 6, 25)
+
+#include <linux/notifier.h>
+#define kernel_bind(sock, addr, addrlen) \
+     sock->ops->bind(sock, addr, addrlen)
+
+/** Emulation of the for_each_netdev macro. 
+ * Register for net device events, which will result in a reply of
+ * all recent events of all devices. Store all devices in a list, so
+ * we can loop over all in the for_each_netdev macro.
+ */
+#define MAX_NETDEVICES (1<<8)
+struct net_device * all_netdevices[MAX_NETDEVICES+1];
+
+static int add_netdev(struct notifier_block *self, unsigned long event, void *dev) {
+  static int idx = 0;
+  static int overflow = 0;
+  if(event == NETDEV_REGISTER && overflow == 0) {
+    if(idx == MAX_NETDEVICES) {
+      printk("Maximum number of devices exceeded!");
+      overflow = 1;
+    }
+    else {
+      all_netdevices[idx++] = (struct net_device*)dev;
+    }
+  }
+  return 0;
+}
+
+#define for_each_netdev(net, d) \
+  struct net_device ** ptr; \
+  do { \
+    struct notifier_block nb = { notifier_call : add_netdev, next: 0, priority: 0 }; \
+    int err;\
+    memset(all_netdevices, 0 , sizeof(all_netdevices));  \
+    if((err = register_netdevice_notifier(&nb)) != 0) \
+      printk("Could not get list of net devices: register_netdevice_notifier returned %d\n", err); \
+    else { /* here, we know all net devices */ \
+      unregister_netdevice_notifier(&nb);\
+    } \
+  } while(0); \
+  for(ptr = &all_netdevices[0]; (d = *ptr) != 0; ptr++)
+
+#endif /* LINUX_VERSION_CODE < KERNEL_VERSION(2, 6, 25) */
 
 struct list_head generic_devices;

diff -r e9f722488fcd master/cdev.c
--- a/master/cdev.c     Mon Oct 25 17:06:45 2010 +0200
+++ b/master/cdev.c     Thu Nov 18 13:35:37 2010 +0100
@@ -3863,8 +3863,7 @@
         return NOPAGE_SIGBUS;
 
     page = vmalloc_to_page(priv->process_data + offset);
-
-    EC_MASTER_DBG(master, "Nopage fault vma, address = %#lx,"
+    EC_MASTER_DBG(priv->cdev->master, 1, "Nopage fault vma, address = %#lx,"
             " offset = %#lx, page = %p\n", address, offset, page);
 
     get_page(page);
diff -r e9f722488fcd master/ethernet.h
--- a/master/ethernet.h Mon Oct 25 17:06:45 2010 +0200
+++ b/master/ethernet.h Thu Nov 18 13:35:37 2010 +0100
@@ -39,7 +39,12 @@
 
 #include <linux/list.h>
 #include <linux/netdevice.h>
+
+#if LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 27)
 #include <linux/semaphore.h>
+#else
+#include <asm/semaphore.h>
+#endif
 
 #include "globals.h"
 #include "slave.h"
diff -r e9f722488fcd master/slave.h
--- a/master/slave.h    Mon Oct 25 17:06:45 2010 +0200
+++ b/master/slave.h    Thu Nov 18 13:35:37 2010 +0100
@@ -39,6 +39,7 @@
 
 #include <linux/list.h>
 #include <linux/kobject.h>
+#include <linux/wait.h>
 
 #include "globals.h"
 #include "datagram.h"