usbdux: usbduxsigma: added soft interval mode in the firmware

urb->interval is ignored in xhci drivers. Instead, the firmware
has an interval counter and transmits data at this interval.
The uframes in-between are zero length packets. In order to be
backward compatible with older kernels which support only USB 2.0
and 1.1 there are two ADC modes in the firmware. The old one which
assumes that the interval is established by the host (urb->interval)
and the new one where the interval value is transmitted to the
firmware.

Signed-off-by: Bernd Porr <mail@berndporr.me.uk>
Signed-off-by: Kyle McMartin <kyle@kernel.org>

diff --git a/usbdux/usbduxsigma_firmware.asm b/usbdux/usbduxsigma_firmware.asm
index 071d5d6b38f5d81eeca3590cae10ac8007bf527b..90998a0b4ef642616bca13012480694299aa96b3 100644 (file)
--- a/usbdux/usbduxsigma_firmware.asm
+++ b/usbdux/usbduxsigma_firmware.asm
@@ -39,6 +39,8 @@
        .equ    DPTRL,85H
        .equ    DPTRH,86h
        .equ    ASYNC_ON,87h
+       .equ    INTERVAL,88h    ; uframe/frame interval
+       .equ    INTCTR,89h      ; interval counter
 
 ;;; actual code
        .org    0000h           ; after reset the processor starts here
@@ -546,7 +548,18 @@ sof_isr:
        push    07h             ; R7
 
        clr     IE.7            ; make sure that no other int's disturbe us
+
+       mov     r0,#INTCTR      ; interval counter
+       mov     a,@r0           ; get the value
+       dec     a               ; decrement
+       mov     @r0,a           ; save it again
+       jz      sof_adc         ; we do ADC functions
+       ljmp    epfull          ; we skip all adc functions
        
+sof_adc:
+       mov     r1,#INTERVAL    ; get the interval
+       mov     a,@r1           ; get it
+       mov     @r0,a           ; save it in the counter
        mov     a,EP2468STAT
        anl     a,#20H          ; full?
        jnz     epfull          ; EP6-buffer is full
@@ -762,6 +775,7 @@ ep1out_jmp:
        sjmp    nothing         ; a=6
        sjmp    pwm_on          ; a=7
        sjmp    pwm_off         ; a=8
+       sjmp    startadcint     ; a=9
 
 nothing:
        ljmp    over_da
@@ -790,12 +804,25 @@ initsgADchannel:
                
        sjmp    over_da
 
+startadcint:
+       mov     dptr,#0e781h    ; FIFO buffer of EP1OUT from 2nd byte
+
+       movx    a,@dptr         ; interval is the 1st byte
+       inc     dptr            ; data pointer
+       sjmp    startadc2       ; the other paramters as with startadc
        
 ;;; config AD:
 ;;; we write to the registers of the A/D converter
 startadc:
        mov     dptr,#0e781h    ; FIFO buffer of EP1OUT from 2nd byte
 
+       mov     a,#1            ; interval is 1 here all the time
+startadc2:     
+       mov     r0,#INTERVAL    ; set it
+       mov     @r0,a
+       mov     r0,#INTCTR      ; the counter is also just one
+       mov     @r0,a
+
        movx    a,@dptr         ; get length of channel list
        inc     dptr
        mov     r0,#MAXSMPL