[Xenomai-core] CAN updates & questions

[Jan Kiszka <jan.kiszka@domain.hid>]

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Hi Wolfgang,

as one result of a hacking session on a PPC405 with SJA1000 on board I
applied two minor fixes to rtcan_isa.c to SVN, see end of mail for
reference. The first one gave an "interesting" effect on big-endian
because irq is an integer, the second one reveals that we should do some
multiport test with the ISA driver soon.

Questions arose regarding the meaning of rtcan_device.can_sys_clock
(BTW, comment in rtcan_dev.h is wrong). What clock rate does it
describe? For the SJA1000 drivers its obviously clock/2. I'm asking
because of a) the output in rtcan_calc_bit_time() and b) the module
parameter of rtcan_isa and its description. We first hacked 16 MHz into
the latter yesterday as I didn't recall quickly enough that our Phytec
board also runs at 16 MHZ, thus the default value of 8 MHZ was already
correct. Confused? At least we were...

And another suggestion: In order make module names shorter, what about
the renaming xeno_rtcan* -> xeno_can*?

Then we will soon have to discuss how to deal with a rtcan_isa
derivative that uses ioremapped memory instead of ports (naming,
separation or integration).

Jan


--

Index: ksrc/drivers/can/sja1000/rtcan_isa.c
===================================================================
--- ksrc/drivers/can/sja1000/rtcan_isa.c	(Revision 1564)
+++ ksrc/drivers/can/sja1000/rtcan_isa.c	(Arbeitskopie)
@@ -56,7 +56,7 @@ static u8 ocr[RTCAN_ISA_MAX_DEV];
 static u8 cdr[RTCAN_ISA_MAX_DEV];

 compat_module_short_param_array(isa, RTCAN_ISA_MAX_DEV);
-compat_module_byte_param_array(irq, RTCAN_ISA_MAX_DEV);
+compat_module_int_param_array(irq, RTCAN_ISA_MAX_DEV);
 compat_module_int_param_array(clock, RTCAN_ISA_MAX_DEV);
 compat_module_byte_param_array(ocr, RTCAN_ISA_MAX_DEV);
 compat_module_byte_param_array(cdr, RTCAN_ISA_MAX_DEV);
@@ -187,9 +187,10 @@ static void __exit rtcan_isa_exit(void)
     int i;
     struct rtcan_device *dev;

-    for (i = 0, dev = rtcan_isa_devs[i];
-	 i < RTCAN_ISA_MAX_DEV && dev != NULL;
-	 i++) {
+    for (i = 0; i < RTCAN_ISA_MAX_DEV; i++) {
+	dev = rtcan_isa_devs[i];
+	if (!dev)
+	    continue;
 	rtcan_sja1000_unregister(dev);
     }
 }


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