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linux-next/drivers/net/wan/wanxlfw.S
Linus Torvalds 1da177e4c3 Linux-2.6.12-rc2 
Initial git repository build. I'm not bothering with the full history,
even though we have it. We can create a separate "historical" git
archive of that later if we want to, and in the meantime it's about
3.2GB when imported into git - space that would just make the early
git days unnecessarily complicated, when we don't have a lot of good
infrastructure for it.

Let it rip!
2005-04-16 15:20:36 -07:00

896 lines
23 KiB
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/*
wanXL serial card driver for Linux
card firmware part
Copyright (C) 2003 Krzysztof Halasa <khc@pm.waw.pl>
This program is free software; you can redistribute it and/or modify it
under the terms of version 2 of the GNU General Public License
as published by the Free Software Foundation.
DPRAM BDs:
0x000 - 0x050 TX#0 0x050 - 0x140 RX#0
0x140 - 0x190 TX#1 0x190 - 0x280 RX#1
0x280 - 0x2D0 TX#2 0x2D0 - 0x3C0 RX#2
0x3C0 - 0x410 TX#3 0x410 - 0x500 RX#3
000 5FF 1536 Bytes Dual-Port RAM User Data / BDs
600 6FF 256 Bytes Dual-Port RAM User Data / BDs
700 7FF 256 Bytes Dual-Port RAM User Data / BDs
C00 CBF 192 Bytes Dual-Port RAM Parameter RAM Page 1
D00 DBF 192 Bytes Dual-Port RAM Parameter RAM Page 2
E00 EBF 192 Bytes Dual-Port RAM Parameter RAM Page 3
F00 FBF 192 Bytes Dual-Port RAM Parameter RAM Page 4
local interrupts level
NMI 7
PIT timer, CPM (RX/TX complete) 4
PCI9060 DMA and PCI doorbells 3
Cable - not used 1
*/
#include <linux/hdlc.h>
#include "wanxl.h"
/* memory addresses and offsets */
MAX_RAM_SIZE = 16 * 1024 * 1024 // max RAM supported by hardware
PCI9060_VECTOR = 0x0000006C
CPM_IRQ_BASE = 0x40
ERROR_VECTOR = CPM_IRQ_BASE * 4
SCC1_VECTOR = (CPM_IRQ_BASE + 0x1E) * 4
SCC2_VECTOR = (CPM_IRQ_BASE + 0x1D) * 4
SCC3_VECTOR = (CPM_IRQ_BASE + 0x1C) * 4
SCC4_VECTOR = (CPM_IRQ_BASE + 0x1B) * 4
CPM_IRQ_LEVEL = 4
TIMER_IRQ = 128
TIMER_IRQ_LEVEL = 4
PITR_CONST = 0x100 + 16 // 1 Hz timer
MBAR = 0x0003FF00
VALUE_WINDOW = 0x40000000
ORDER_WINDOW = 0xC0000000
PLX = 0xFFF90000
CSRA = 0xFFFB0000
CSRB = 0xFFFB0002
CSRC = 0xFFFB0004
CSRD = 0xFFFB0006
STATUS_CABLE_LL = 0x2000
STATUS_CABLE_DTR = 0x1000
DPRBASE = 0xFFFC0000
SCC1_BASE = DPRBASE + 0xC00
MISC_BASE = DPRBASE + 0xCB0
SCC2_BASE = DPRBASE + 0xD00
SCC3_BASE = DPRBASE + 0xE00
SCC4_BASE = DPRBASE + 0xF00
// offset from SCCx_BASE
// SCC_xBASE contain offsets from DPRBASE and must be divisible by 8
SCC_RBASE = 0 // 16-bit RxBD base address
SCC_TBASE = 2 // 16-bit TxBD base address
SCC_RFCR = 4 // 8-bit Rx function code
SCC_TFCR = 5 // 8-bit Tx function code
SCC_MRBLR = 6 // 16-bit maximum Rx buffer length
SCC_C_MASK = 0x34 // 32-bit CRC constant
SCC_C_PRES = 0x38 // 32-bit CRC preset
SCC_MFLR = 0x46 // 16-bit max Rx frame length (without flags)
REGBASE = DPRBASE + 0x1000
PICR = REGBASE + 0x026 // 16-bit periodic irq control
PITR = REGBASE + 0x02A // 16-bit periodic irq timing
OR1 = REGBASE + 0x064 // 32-bit RAM bank #1 options
CICR = REGBASE + 0x540 // 32(24)-bit CP interrupt config
CIMR = REGBASE + 0x548 // 32-bit CP interrupt mask
CISR = REGBASE + 0x54C // 32-bit CP interrupts in-service
PADIR = REGBASE + 0x550 // 16-bit PortA data direction bitmap
PAPAR = REGBASE + 0x552 // 16-bit PortA pin assignment bitmap
PAODR = REGBASE + 0x554 // 16-bit PortA open drain bitmap
PADAT = REGBASE + 0x556 // 16-bit PortA data register
PCDIR = REGBASE + 0x560 // 16-bit PortC data direction bitmap
PCPAR = REGBASE + 0x562 // 16-bit PortC pin assignment bitmap
PCSO = REGBASE + 0x564 // 16-bit PortC special options
PCDAT = REGBASE + 0x566 // 16-bit PortC data register
PCINT = REGBASE + 0x568 // 16-bit PortC interrupt control
CR = REGBASE + 0x5C0 // 16-bit Command register
SCC1_REGS = REGBASE + 0x600
SCC2_REGS = REGBASE + 0x620
SCC3_REGS = REGBASE + 0x640
SCC4_REGS = REGBASE + 0x660
SICR = REGBASE + 0x6EC // 32-bit SI clock route
// offset from SCCx_REGS
SCC_GSMR_L = 0x00 // 32 bits
SCC_GSMR_H = 0x04 // 32 bits
SCC_PSMR = 0x08 // 16 bits
SCC_TODR = 0x0C // 16 bits
SCC_DSR = 0x0E // 16 bits
SCC_SCCE = 0x10 // 16 bits
SCC_SCCM = 0x14 // 16 bits
SCC_SCCS = 0x17 // 8 bits
#if QUICC_MEMCPY_USES_PLX
.macro memcpy_from_pci src, dest, len // len must be < 8 MB
addl #3, \len
andl #0xFFFFFFFC, \len // always copy n * 4 bytes
movel \src, PLX_DMA_0_PCI
movel \dest, PLX_DMA_0_LOCAL
movel \len, PLX_DMA_0_LENGTH
movel #0x0103, PLX_DMA_CMD_STS // start channel 0 transfer
bsr memcpy_from_pci_run
.endm
.macro memcpy_to_pci src, dest, len
addl #3, \len
andl #0xFFFFFFFC, \len // always copy n * 4 bytes
movel \src, PLX_DMA_1_LOCAL
movel \dest, PLX_DMA_1_PCI
movel \len, PLX_DMA_1_LENGTH
movel #0x0301, PLX_DMA_CMD_STS // start channel 1 transfer
bsr memcpy_to_pci_run
.endm
#else
.macro memcpy src, dest, len // len must be < 65536 bytes
movel %d7, -(%sp) // src and dest must be < 256 MB
movel \len, %d7 // bits 0 and 1
lsrl #2, \len
andl \len, \len
beq 99f // only 0 - 3 bytes
subl #1, \len // for dbf
98: movel (\src)+, (\dest)+
dbfw \len, 98b
99: movel %d7, \len
btstl #1, \len
beq 99f
movew (\src)+, (\dest)+
99: btstl #0, \len
beq 99f
moveb (\src)+, (\dest)+
99:
movel (%sp)+, %d7
.endm
.macro memcpy_from_pci src, dest, len
addl #VALUE_WINDOW, \src
memcpy \src, \dest, \len
.endm
.macro memcpy_to_pci src, dest, len
addl #VALUE_WINDOW, \dest
memcpy \src, \dest, \len
.endm
#endif
.macro wait_for_command
99: btstl #0, CR
bne 99b
.endm
/****************************** card initialization *******************/
.text
.global _start
_start: bra init
.org _start + 4
ch_status_addr: .long 0, 0, 0, 0
rx_descs_addr: .long 0
init:
#if DETECT_RAM
movel OR1, %d0
andl #0xF00007FF, %d0 // mask AMxx bits
orl #0xFFFF800 & ~(MAX_RAM_SIZE - 1), %d0 // update RAM bank size
movel %d0, OR1
#endif
addl #VALUE_WINDOW, rx_descs_addr // PCI addresses of shared data
clrl %d0 // D0 = 4 * port
init_1: tstl ch_status_addr(%d0)
beq init_2
addl #VALUE_WINDOW, ch_status_addr(%d0)
init_2: addl #4, %d0
cmpl #4 * 4, %d0
bne init_1
movel #pci9060_interrupt, PCI9060_VECTOR
movel #error_interrupt, ERROR_VECTOR
movel #port_interrupt_1, SCC1_VECTOR
movel #port_interrupt_2, SCC2_VECTOR
movel #port_interrupt_3, SCC3_VECTOR
movel #port_interrupt_4, SCC4_VECTOR
movel #timer_interrupt, TIMER_IRQ * 4
movel #0x78000000, CIMR // only SCCx IRQs from CPM
movew #(TIMER_IRQ_LEVEL << 8) + TIMER_IRQ, PICR // interrupt from PIT
movew #PITR_CONST, PITR
// SCC1=SCCa SCC2=SCCb SCC3=SCCc SCC4=SCCd prio=4 HP=-1 IRQ=64-79
movel #0xD41F40 + (CPM_IRQ_LEVEL << 13), CICR
movel #0x543, PLX_DMA_0_MODE // 32-bit, Ready, Burst, IRQ
movel #0x543, PLX_DMA_1_MODE
movel #0x0, PLX_DMA_0_DESC // from PCI to local
movel #0x8, PLX_DMA_1_DESC // from local to PCI
movel #0x101, PLX_DMA_CMD_STS // enable both DMA channels
// enable local IRQ, DMA, doorbells and PCI IRQ
orl #0x000F0300, PLX_INTERRUPT_CS
#if DETECT_RAM
bsr ram_test
#else
movel #1, PLX_MAILBOX_5 // non-zero value = init complete
#endif
bsr check_csr
movew #0xFFFF, PAPAR // all pins are clocks/data
clrw PADIR // first function
clrw PCSO // CD and CTS always active
/****************************** main loop *****************************/
main: movel channel_stats, %d7 // D7 = doorbell + irq status
clrl channel_stats
tstl %d7
bne main_1
// nothing to do - wait for next event
stop #0x2200 // supervisor + IRQ level 2
movew #0x2700, %sr // disable IRQs again
bra main
main_1: clrl %d0 // D0 = 4 * port
clrl %d6 // D6 = doorbell to host value
main_l: btstl #DOORBELL_TO_CARD_CLOSE_0, %d7
beq main_op
bclrl #DOORBELL_TO_CARD_OPEN_0, %d7 // in case both bits are set
bsr close_port
main_op:
btstl #DOORBELL_TO_CARD_OPEN_0, %d7
beq main_cl
bsr open_port
main_cl:
btstl #DOORBELL_TO_CARD_TX_0, %d7
beq main_txend
bsr tx
main_txend:
btstl #TASK_SCC_0, %d7
beq main_next
bsr tx_end
bsr rx
main_next:
lsrl #1, %d7 // port status for next port
addl #4, %d0 // D0 = 4 * next port
cmpl #4 * 4, %d0
bne main_l
movel %d6, PLX_DOORBELL_FROM_CARD // signal the host
bra main
/****************************** open port *****************************/
open_port: // D0 = 4 * port, D6 = doorbell to host
movel ch_status_addr(%d0), %a0 // A0 = port status address
tstl STATUS_OPEN(%a0)
bne open_port_ret // port already open
movel #1, STATUS_OPEN(%a0) // confirm the port is open
// setup BDs
clrl tx_in(%d0)
clrl tx_out(%d0)
clrl tx_count(%d0)
clrl rx_in(%d0)
movel SICR, %d1 // D1 = clock settings in SICR
andl clocking_mask(%d0), %d1
cmpl #CLOCK_TXFROMRX, STATUS_CLOCKING(%a0)
bne open_port_clock_ext
orl clocking_txfromrx(%d0), %d1
bra open_port_set_clock
open_port_clock_ext:
orl clocking_ext(%d0), %d1
open_port_set_clock:
movel %d1, SICR // update clock settings in SICR
orw #STATUS_CABLE_DTR, csr_output(%d0) // DTR on
bsr check_csr // call with disabled timer interrupt
// Setup TX descriptors
movel first_buffer(%d0), %d1 // D1 = starting buffer address
movel tx_first_bd(%d0), %a1 // A1 = starting TX BD address
movel #TX_BUFFERS - 2, %d2 // D2 = TX_BUFFERS - 1 counter
movel #0x18000000, %d3 // D3 = initial TX BD flags: Int + Last
cmpl #PARITY_NONE, STATUS_PARITY(%a0)
beq open_port_tx_loop
bsetl #26, %d3 // TX BD flag: Transmit CRC
open_port_tx_loop:
movel %d3, (%a1)+ // TX flags + length
movel %d1, (%a1)+ // buffer address
addl #BUFFER_LENGTH, %d1
dbfw %d2, open_port_tx_loop
bsetl #29, %d3 // TX BD flag: Wrap (last BD)
movel %d3, (%a1)+ // Final TX flags + length
movel %d1, (%a1)+ // buffer address
// Setup RX descriptors // A1 = starting RX BD address
movel #RX_BUFFERS - 2, %d2 // D2 = RX_BUFFERS - 1 counter
open_port_rx_loop:
movel #0x90000000, (%a1)+ // RX flags + length
movel %d1, (%a1)+ // buffer address
addl #BUFFER_LENGTH, %d1
dbfw %d2, open_port_rx_loop
movel #0xB0000000, (%a1)+ // Final RX flags + length
movel %d1, (%a1)+ // buffer address
// Setup port parameters
movel scc_base_addr(%d0), %a1 // A1 = SCC_BASE address
movel scc_reg_addr(%d0), %a2 // A2 = SCC_REGS address
movel #0xFFFF, SCC_SCCE(%a2) // clear status bits
movel #0x0000, SCC_SCCM(%a2) // interrupt mask
movel tx_first_bd(%d0), %d1
movew %d1, SCC_TBASE(%a1) // D1 = offset of first TxBD
addl #TX_BUFFERS * 8, %d1
movew %d1, SCC_RBASE(%a1) // D1 = offset of first RxBD
moveb #0x8, SCC_RFCR(%a1) // Intel mode, 1000
moveb #0x8, SCC_TFCR(%a1)
// Parity settings
cmpl #PARITY_CRC16_PR1_CCITT, STATUS_PARITY(%a0)
bne open_port_parity_1
clrw SCC_PSMR(%a2) // CRC16-CCITT
movel #0xF0B8, SCC_C_MASK(%a1)
movel #0xFFFF, SCC_C_PRES(%a1)
movew #HDLC_MAX_MRU + 2, SCC_MFLR(%a1) // 2 bytes for CRC
movew #2, parity_bytes(%d0)
bra open_port_2
open_port_parity_1:
cmpl #PARITY_CRC32_PR1_CCITT, STATUS_PARITY(%a0)
bne open_port_parity_2
movew #0x0800, SCC_PSMR(%a2) // CRC32-CCITT
movel #0xDEBB20E3, SCC_C_MASK(%a1)
movel #0xFFFFFFFF, SCC_C_PRES(%a1)
movew #HDLC_MAX_MRU + 4, SCC_MFLR(%a1) // 4 bytes for CRC
movew #4, parity_bytes(%d0)
bra open_port_2
open_port_parity_2:
cmpl #PARITY_CRC16_PR0_CCITT, STATUS_PARITY(%a0)
bne open_port_parity_3
clrw SCC_PSMR(%a2) // CRC16-CCITT preset 0
movel #0xF0B8, SCC_C_MASK(%a1)
clrl SCC_C_PRES(%a1)
movew #HDLC_MAX_MRU + 2, SCC_MFLR(%a1) // 2 bytes for CRC
movew #2, parity_bytes(%d0)
bra open_port_2
open_port_parity_3:
cmpl #PARITY_CRC32_PR0_CCITT, STATUS_PARITY(%a0)
bne open_port_parity_4
movew #0x0800, SCC_PSMR(%a2) // CRC32-CCITT preset 0
movel #0xDEBB20E3, SCC_C_MASK(%a1)
clrl SCC_C_PRES(%a1)
movew #HDLC_MAX_MRU + 4, SCC_MFLR(%a1) // 4 bytes for CRC
movew #4, parity_bytes(%d0)
bra open_port_2
open_port_parity_4:
clrw SCC_PSMR(%a2) // no parity
movel #0xF0B8, SCC_C_MASK(%a1)
movel #0xFFFF, SCC_C_PRES(%a1)
movew #HDLC_MAX_MRU, SCC_MFLR(%a1) // 0 bytes for CRC
clrw parity_bytes(%d0)
open_port_2:
movel #0x00000003, SCC_GSMR_H(%a2) // RTSM
cmpl #ENCODING_NRZI, STATUS_ENCODING(%a0)
bne open_port_nrz
movel #0x10040900, SCC_GSMR_L(%a2) // NRZI: TCI Tend RECN+TENC=1
bra open_port_3
open_port_nrz:
movel #0x10040000, SCC_GSMR_L(%a2) // NRZ: TCI Tend RECN+TENC=0
open_port_3:
movew #BUFFER_LENGTH, SCC_MRBLR(%a1)
movel %d0, %d1
lsll #4, %d1 // D1 bits 7 and 6 = port
orl #1, %d1
movew %d1, CR // Init SCC RX and TX params
wait_for_command
// TCI Tend ENR ENT
movew #0x001F, SCC_SCCM(%a2) // TXE RXF BSY TXB RXB interrupts
orl #0x00000030, SCC_GSMR_L(%a2) // enable SCC
open_port_ret:
rts
/****************************** close port ****************************/
close_port: // D0 = 4 * port, D6 = doorbell to host
movel scc_reg_addr(%d0), %a0 // A0 = SCC_REGS address
clrw SCC_SCCM(%a0) // no SCC interrupts
andl #0xFFFFFFCF, SCC_GSMR_L(%a0) // Disable ENT and ENR
andw #~STATUS_CABLE_DTR, csr_output(%d0) // DTR off
bsr check_csr // call with disabled timer interrupt
movel ch_status_addr(%d0), %d1
clrl STATUS_OPEN(%d1) // confirm the port is closed
rts
/****************************** transmit packet ***********************/
// queue packets for transmission
tx: // D0 = 4 * port, D6 = doorbell to host
cmpl #TX_BUFFERS, tx_count(%d0)
beq tx_ret // all DB's = descs in use
movel tx_out(%d0), %d1
movel %d1, %d2 // D1 = D2 = tx_out BD# = desc#
mulul #DESC_LENGTH, %d2 // D2 = TX desc offset
addl ch_status_addr(%d0), %d2
addl #STATUS_TX_DESCS, %d2 // D2 = TX desc address
cmpl #PACKET_FULL, (%d2) // desc status
bne tx_ret
// queue it
movel 4(%d2), %a0 // PCI address
lsll #3, %d1 // BD is 8-bytes long
addl tx_first_bd(%d0), %d1 // D1 = current tx_out BD addr
movel 4(%d1), %a1 // A1 = dest address
movel 8(%d2), %d2 // D2 = length
movew %d2, 2(%d1) // length into BD
memcpy_from_pci %a0, %a1, %d2
bsetl #31, (%d1) // CP go ahead
// update tx_out and tx_count
movel tx_out(%d0), %d1
addl #1, %d1
cmpl #TX_BUFFERS, %d1
bne tx_1
clrl %d1
tx_1: movel %d1, tx_out(%d0)
addl #1, tx_count(%d0)
bra tx
tx_ret: rts
/****************************** packet received ***********************/
// Service receive buffers // D0 = 4 * port, D6 = doorbell to host
rx: movel rx_in(%d0), %d1 // D1 = rx_in BD#
lsll #3, %d1 // BD is 8-bytes long
addl rx_first_bd(%d0), %d1 // D1 = current rx_in BD address
movew (%d1), %d2 // D2 = RX BD flags
btstl #15, %d2
bne rx_ret // BD still empty
btstl #1, %d2
bne rx_overrun
tstw parity_bytes(%d0)
bne rx_parity
bclrl #2, %d2 // do not test for CRC errors
rx_parity:
andw #0x0CBC, %d2 // mask status bits
cmpw #0x0C00, %d2 // correct frame
bne rx_bad_frame
clrl %d3
movew 2(%d1), %d3
subw parity_bytes(%d0), %d3 // D3 = packet length
cmpw #HDLC_MAX_MRU, %d3
bgt rx_bad_frame
rx_good_frame:
movel rx_out, %d2
mulul #DESC_LENGTH, %d2
addl rx_descs_addr, %d2 // D2 = RX desc address
cmpl #PACKET_EMPTY, (%d2) // desc stat
bne rx_overrun
movel %d3, 8(%d2)
movel 4(%d1), %a0 // A0 = source address
movel 4(%d2), %a1
tstl %a1
beq rx_ignore_data
memcpy_to_pci %a0, %a1, %d3
rx_ignore_data:
movel packet_full(%d0), (%d2) // update desc stat
// update D6 and rx_out
bsetl #DOORBELL_FROM_CARD_RX, %d6 // signal host that RX completed
movel rx_out, %d2
addl #1, %d2
cmpl #RX_QUEUE_LENGTH, %d2
bne rx_1
clrl %d2
rx_1: movel %d2, rx_out
rx_free_bd:
andw #0xF000, (%d1) // clear CM and error bits
bsetl #31, (%d1) // free BD
// update rx_in
movel rx_in(%d0), %d1
addl #1, %d1
cmpl #RX_BUFFERS, %d1
bne rx_2
clrl %d1
rx_2: movel %d1, rx_in(%d0)
bra rx
rx_overrun:
movel ch_status_addr(%d0), %d2
addl #1, STATUS_RX_OVERRUNS(%d2)
bra rx_free_bd
rx_bad_frame:
movel ch_status_addr(%d0), %d2
addl #1, STATUS_RX_FRAME_ERRORS(%d2)
bra rx_free_bd
rx_ret: rts
/****************************** packet transmitted ********************/
// Service transmit buffers // D0 = 4 * port, D6 = doorbell to host
tx_end: tstl tx_count(%d0)
beq tx_end_ret // TX buffers already empty
movel tx_in(%d0), %d1
movel %d1, %d2 // D1 = D2 = tx_in BD# = desc#
lsll #3, %d1 // BD is 8-bytes long
addl tx_first_bd(%d0), %d1 // D1 = current tx_in BD address
movew (%d1), %d3 // D3 = TX BD flags
btstl #15, %d3
bne tx_end_ret // BD still being transmitted
// update D6, tx_in and tx_count
orl bell_tx(%d0), %d6 // signal host that TX desc freed
subl #1, tx_count(%d0)
movel tx_in(%d0), %d1
addl #1, %d1
cmpl #TX_BUFFERS, %d1
bne tx_end_1
clrl %d1
tx_end_1:
movel %d1, tx_in(%d0)
// free host's descriptor
mulul #DESC_LENGTH, %d2 // D2 = TX desc offset
addl ch_status_addr(%d0), %d2
addl #STATUS_TX_DESCS, %d2 // D2 = TX desc address
btstl #1, %d3
bne tx_end_underrun
movel #PACKET_SENT, (%d2)
bra tx_end
tx_end_underrun:
movel #PACKET_UNDERRUN, (%d2)
bra tx_end
tx_end_ret: rts
/****************************** PLX PCI9060 DMA memcpy ****************/
#if QUICC_MEMCPY_USES_PLX
// called with interrupts disabled
memcpy_from_pci_run:
movel %d0, -(%sp)
movew %sr, -(%sp)
memcpy_1:
movel PLX_DMA_CMD_STS, %d0 // do not btst PLX register directly
btstl #4, %d0 // transfer done?
bne memcpy_end
stop #0x2200 // enable PCI9060 interrupts
movew #0x2700, %sr // disable interrupts again
bra memcpy_1
memcpy_to_pci_run:
movel %d0, -(%sp)
movew %sr, -(%sp)
memcpy_2:
movel PLX_DMA_CMD_STS, %d0 // do not btst PLX register directly
btstl #12, %d0 // transfer done?
bne memcpy_end
stop #0x2200 // enable PCI9060 interrupts
movew #0x2700, %sr // disable interrupts again
bra memcpy_2
memcpy_end:
movew (%sp)+, %sr
movel (%sp)+, %d0
rts
#endif
/****************************** PLX PCI9060 interrupt *****************/
pci9060_interrupt:
movel %d0, -(%sp)
movel PLX_DOORBELL_TO_CARD, %d0
movel %d0, PLX_DOORBELL_TO_CARD // confirm all requests
orl %d0, channel_stats
movel #0x0909, PLX_DMA_CMD_STS // clear DMA ch #0 and #1 interrupts
movel (%sp)+, %d0
rte
/****************************** SCC interrupts ************************/
port_interrupt_1:
orl #0, SCC1_REGS + SCC_SCCE; // confirm SCC events
orl #1 << TASK_SCC_0, channel_stats
movel #0x40000000, CISR
rte
port_interrupt_2:
orl #0, SCC2_REGS + SCC_SCCE; // confirm SCC events
orl #1 << TASK_SCC_1, channel_stats
movel #0x20000000, CISR
rte
port_interrupt_3:
orl #0, SCC3_REGS + SCC_SCCE; // confirm SCC events
orl #1 << TASK_SCC_2, channel_stats
movel #0x10000000, CISR
rte
port_interrupt_4:
orl #0, SCC4_REGS + SCC_SCCE; // confirm SCC events
orl #1 << TASK_SCC_3, channel_stats
movel #0x08000000, CISR
rte
error_interrupt:
rte
/****************************** cable and PM routine ******************/
// modified registers: none
check_csr:
movel %d0, -(%sp)
movel %d1, -(%sp)
movel %d2, -(%sp)
movel %a0, -(%sp)
movel %a1, -(%sp)
clrl %d0 // D0 = 4 * port
movel #CSRA, %a0 // A0 = CSR address
check_csr_loop:
movew (%a0), %d1 // D1 = CSR input bits
andl #0xE7, %d1 // PM and cable sense bits (no DCE bit)
cmpw #STATUS_CABLE_V35 * (1 + 1 << STATUS_CABLE_PM_SHIFT), %d1
bne check_csr_1
movew #0x0E08, %d1
bra check_csr_valid
check_csr_1:
cmpw #STATUS_CABLE_X21 * (1 + 1 << STATUS_CABLE_PM_SHIFT), %d1
bne check_csr_2
movew #0x0408, %d1
bra check_csr_valid
check_csr_2:
cmpw #STATUS_CABLE_V24 * (1 + 1 << STATUS_CABLE_PM_SHIFT), %d1
bne check_csr_3
movew #0x0208, %d1
bra check_csr_valid
check_csr_3:
cmpw #STATUS_CABLE_EIA530 * (1 + 1 << STATUS_CABLE_PM_SHIFT), %d1
bne check_csr_disable
movew #0x0D08, %d1
bra check_csr_valid
check_csr_disable:
movew #0x0008, %d1 // D1 = disable everything
movew #0x80E7, %d2 // D2 = input mask: ignore DSR
bra check_csr_write
check_csr_valid: // D1 = mode and IRQ bits
movew csr_output(%d0), %d2
andw #0x3000, %d2 // D2 = requested LL and DTR bits
orw %d2, %d1 // D1 = all requested output bits
movew #0x80FF, %d2 // D2 = input mask: include DSR
check_csr_write:
cmpw old_csr_output(%d0), %d1
beq check_csr_input
movew %d1, old_csr_output(%d0)
movew %d1, (%a0) // Write CSR output bits
check_csr_input:
movew (PCDAT), %d1
andw dcd_mask(%d0), %d1
beq check_csr_dcd_on // DCD and CTS signals are negated
movew (%a0), %d1 // D1 = CSR input bits
andw #~STATUS_CABLE_DCD, %d1 // DCD off
bra check_csr_previous
check_csr_dcd_on:
movew (%a0), %d1 // D1 = CSR input bits
orw #STATUS_CABLE_DCD, %d1 // DCD on
check_csr_previous:
andw %d2, %d1 // input mask
movel ch_status_addr(%d0), %a1
cmpl STATUS_CABLE(%a1), %d1 // check for change
beq check_csr_next
movel %d1, STATUS_CABLE(%a1) // update status
movel bell_cable(%d0), PLX_DOORBELL_FROM_CARD // signal the host
check_csr_next:
addl #2, %a0 // next CSR register
addl #4, %d0 // D0 = 4 * next port
cmpl #4 * 4, %d0
bne check_csr_loop
movel (%sp)+, %a1
movel (%sp)+, %a0
movel (%sp)+, %d2
movel (%sp)+, %d1
movel (%sp)+, %d0
rts
/****************************** timer interrupt ***********************/
timer_interrupt:
bsr check_csr
rte
/****************************** RAM sizing and test *******************/
#if DETECT_RAM
ram_test:
movel #0x12345678, %d1 // D1 = test value
movel %d1, (128 * 1024 - 4)
movel #128 * 1024, %d0 // D0 = RAM size tested
ram_test_size:
cmpl #MAX_RAM_SIZE, %d0
beq ram_test_size_found
movel %d0, %a0
addl #128 * 1024 - 4, %a0
cmpl (%a0), %d1
beq ram_test_size_check
ram_test_next_size:
lsll #1, %d0
bra ram_test_size
ram_test_size_check:
eorl #0xFFFFFFFF, %d1
movel %d1, (128 * 1024 - 4)
cmpl (%a0), %d1
bne ram_test_next_size
ram_test_size_found: // D0 = RAM size
movel %d0, %a0 // A0 = fill ptr
subl #firmware_end + 4, %d0
lsrl #2, %d0
movel %d0, %d1 // D1 = DBf counter
ram_test_fill:
movel %a0, -(%a0)
dbfw %d1, ram_test_fill
subl #0x10000, %d1
cmpl #0xFFFFFFFF, %d1
bne ram_test_fill
ram_test_loop: // D0 = DBf counter
cmpl (%a0)+, %a0
dbnew %d0, ram_test_loop
bne ram_test_found_bad
subl #0x10000, %d0
cmpl #0xFFFFFFFF, %d0
bne ram_test_loop
bra ram_test_all_ok
ram_test_found_bad:
subl #4, %a0
ram_test_all_ok:
movel %a0, PLX_MAILBOX_5
rts
#endif
/****************************** constants *****************************/
scc_reg_addr:
.long SCC1_REGS, SCC2_REGS, SCC3_REGS, SCC4_REGS
scc_base_addr:
.long SCC1_BASE, SCC2_BASE, SCC3_BASE, SCC4_BASE
tx_first_bd:
.long DPRBASE
.long DPRBASE + (TX_BUFFERS + RX_BUFFERS) * 8
.long DPRBASE + (TX_BUFFERS + RX_BUFFERS) * 8 * 2
.long DPRBASE + (TX_BUFFERS + RX_BUFFERS) * 8 * 3
rx_first_bd:
.long DPRBASE + TX_BUFFERS * 8
.long DPRBASE + TX_BUFFERS * 8 + (TX_BUFFERS + RX_BUFFERS) * 8
.long DPRBASE + TX_BUFFERS * 8 + (TX_BUFFERS + RX_BUFFERS) * 8 * 2
.long DPRBASE + TX_BUFFERS * 8 + (TX_BUFFERS + RX_BUFFERS) * 8 * 3
first_buffer:
.long BUFFERS_ADDR
.long BUFFERS_ADDR + (TX_BUFFERS + RX_BUFFERS) * BUFFER_LENGTH
.long BUFFERS_ADDR + (TX_BUFFERS + RX_BUFFERS) * BUFFER_LENGTH * 2
.long BUFFERS_ADDR + (TX_BUFFERS + RX_BUFFERS) * BUFFER_LENGTH * 3
bell_tx:
.long 1 << DOORBELL_FROM_CARD_TX_0, 1 << DOORBELL_FROM_CARD_TX_1
.long 1 << DOORBELL_FROM_CARD_TX_2, 1 << DOORBELL_FROM_CARD_TX_3
bell_cable:
.long 1 << DOORBELL_FROM_CARD_CABLE_0, 1 << DOORBELL_FROM_CARD_CABLE_1
.long 1 << DOORBELL_FROM_CARD_CABLE_2, 1 << DOORBELL_FROM_CARD_CABLE_3
packet_full:
.long PACKET_FULL, PACKET_FULL + 1, PACKET_FULL + 2, PACKET_FULL + 3
clocking_ext:
.long 0x0000002C, 0x00003E00, 0x002C0000, 0x3E000000
clocking_txfromrx:
.long 0x0000002D, 0x00003F00, 0x002D0000, 0x3F000000
clocking_mask:
.long 0x000000FF, 0x0000FF00, 0x00FF0000, 0xFF000000
dcd_mask:
.word 0x020, 0, 0x080, 0, 0x200, 0, 0x800
.ascii "wanXL firmware\n"
.asciz "Copyright (C) 2003 Krzysztof Halasa <khc@pm.waw.pl>\n"
/****************************** variables *****************************/
.align 4
channel_stats: .long 0
tx_in: .long 0, 0, 0, 0 // transmitted
tx_out: .long 0, 0, 0, 0 // received from host for transmission
tx_count: .long 0, 0, 0, 0 // currently in transmit queue
rx_in: .long 0, 0, 0, 0 // received from port
rx_out: .long 0 // transmitted to host
parity_bytes: .word 0, 0, 0, 0, 0, 0, 0 // only 4 words are used
csr_output: .word 0
old_csr_output: .word 0, 0, 0, 0, 0, 0, 0
.align 4
firmware_end: // must be dword-aligned
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