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!
diff --git a/drivers/net/wan/wanxlfw.S b/drivers/net/wan/wanxlfw.S
new file mode 100644
index 0000000..73aae2b
--- /dev/null
+++ b/drivers/net/wan/wanxlfw.S
@@ -0,0 +1,895 @@
+.psize 0
+/*
+ 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