Using modem signal in cpm2 uart for MPC8270

[Mathieu Deschamps]

Hello ppc-embedded folks,

I'am looking for a hint in arch/ppc/cpm2_io/uart.c on enable modem signal 
handling on MontaVista Linux 2.4.20. I know it's a bit ancient but some of
you may have a good memory :) I mentionned enabling modem signal because this 
file seems to support modem, yet I come to the conclusion it is incomplete.  

In void rs_8xx_interrupt function I've noticed it needs 'modem_control' 
defined to get the call done and modem lines changed on interrup(1). Also it 
needs defined 'notdef' to implement this code(2).

===(1)
#ifdef modem_control
        check_modem_status(info);
#endif
===(2)
#ifdef notdef
        /* I need to do this for the SCCs, so it is left as a reminder.
        */
static _INLINE_ void check_modem_status(struct async_struct *info)
{
 [...]
}
#endif
===

Having this done is not sufficient, a lot of registers defined in 
linux/serial_reg.h are reported missing. I have included this file, yet
other functions are missing, struct members also. 
Here is compilation output :
===========================
uart.c: In function `check_modem_status':
uart.c:603: warning: implicit declaration of function `serial_in'
uart.c:638: error: structure has no member named `tqueue_hangup'
uart.c:650: warning: implicit declaration of function `serial_out'
uart.c:651: warning: passing arg 1 of `rs_sched_event' from incompatible 
pointer type
uart.c: In function `rs_8xx_interrupt':
uart.c:709: warning: passing arg 1 of `check_modem_status' from incompatible 
pointer type
uart.c: In function `startup':
uart.c:813: error: structure has no member named `MCR'
uart.c:815: error: structure has no member named `MCR'
uart.c: In function `change_speed':
uart.c:993: error: structure has no member named `IER'
uart.c:995: error: structure has no member named `IER'
uart.c:998: error: structure has no member named `IER'
uart.c:1005: error: structure has no member named `IER'
uart.c:1007: error: structure has no member named `IER'
uart.c: In function `rs_8xx_throttle':
uart.c:1255: error: structure has no member named `MCR'
uart.c:1258: error: structure has no member named `MCR'
uart.c: In function `rs_8xx_unthrottle':
uart.c:1284: error: structure has no member named `MCR'
uart.c:1286: error: structure has no member named `MCR'
uart.c: In function `get_modem_info':
uart.c:1327: error: structure has no member named `MCR'
uart.c: In function `set_modem_info':
uart.c:1358: error: structure has no member named `MCR'
uart.c:1360: error: structure has no member named `MCR'
uart.c:1363: error: structure has no member named `MCR'
uart.c:1365: error: structure has no member named `MCR'
uart.c:1370: error: structure has no member named `MCR'
uart.c:1372: error: structure has no member named `MCR'
uart.c:1375: error: structure has no member named `MCR'
uart.c:1377: error: structure has no member named `MCR'
uart.c:1381: error: structure has no member named `MCR'
uart.c:1381: error: structure has no member named `MCR'
uart.c:1398: error: structure has no member named `MCR'
uart.c: In function `begin_break':
uart.c:1417: warning: comparison is always false due to limited range of data 
type
uart.c: In function `end_break':
uart.c:1461: warning: comparison is always false due to limited range of data 
type
uart.c: In function `rs_8xx_ioctl':
uart.c:1600: error: `cprev' undeclared (first use in this function)
uart.c:1600: error: (Each undeclared identifier is reported only once
uart.c:1600: error: for each function it appears in.)
uart.c:1603: error: structure has no member named `delta_msr_wait'
uart.c: In function `rs_8xx_set_termios':
uart.c:1670: error: structure has no member named `MCR'
uart.c:1672: error: structure has no member named `MCR'
uart.c:1679: error: structure has no member named `MCR'
uart.c:1682: error: structure has no member named `MCR'
uart.c:1685: error: structure has no member named `MCR'
uart.c: In function `rs_8xx_wait_until_sent':
uart.c:1839: warning: unused variable `lsr'
=======

I wonder if modem support is incomplete or even if it was dropped in here but 
was conceived for another arch . 

Looking forward to read your inputs.


Best regards,
 

Mathieu Deschamps