Adding upstream version 6.1.76.upstream/6.1.76

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 894 insertions, 0 deletions

diff --git a/drivers/net/wan/wanxlfw.S b/drivers/net/wan/wanxlfw.S
new file mode 100644
index 000000000..6c3735ac8
--- /dev/null
+++ b/drivers/net/wan/wanxlfw.S
@@ -0,0 +1,894 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
+.psize 0
+/*
+  wanXL serial card driver for Linux
+  card firmware part
+
+  Copyright (C) 2003 Krzysztof Halasa <khc@pm.waw.pl>
+
+
+
+
+
+	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 <linux/hdlc/ioctl.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