diff options
Diffstat (limited to 'arch/mn10300/kernel/mn10300-serial-low.S')
| -rw-r--r-- | arch/mn10300/kernel/mn10300-serial-low.S | 194 |
1 files changed, 0 insertions, 194 deletions
diff --git a/arch/mn10300/kernel/mn10300-serial-low.S b/arch/mn10300/kernel/mn10300-serial-low.S deleted file mode 100644 index b95e76caf4fa..000000000000 --- a/arch/mn10300/kernel/mn10300-serial-low.S +++ /dev/null @@ -1,194 +0,0 @@ -############################################################################### -# -# Virtual DMA driver for MN10300 serial ports -# -# Copyright (C) 2007 Red Hat, Inc. All Rights Reserved. -# Written by David Howells (dhowells@redhat.com) -# -# This program is free software; you can redistribute it and/or -# modify it under the terms of the GNU General Public Licence -# as published by the Free Software Foundation; either version -# 2 of the Licence, or (at your option) any later version. -# -############################################################################### -#include <linux/sys.h> -#include <linux/linkage.h> -#include <asm/page.h> -#include <asm/smp.h> -#include <asm/cpu-regs.h> -#include <asm/frame.inc> -#include <asm/timer-regs.h> -#include <proc/cache.h> -#include <unit/timex.h> -#include "mn10300-serial.h" - -#define SCxCTR 0x00 -#define SCxICR 0x04 -#define SCxTXB 0x08 -#define SCxRXB 0x09 -#define SCxSTR 0x0c -#define SCxTIM 0x0d - - .text - -############################################################################### -# -# serial port interrupt virtual DMA entry point -# - intended to run at interrupt priority 1 (not affected by local_irq_disable) -# -############################################################################### - .balign L1_CACHE_BYTES -ENTRY(mn10300_serial_vdma_interrupt) -# or EPSW_IE,psw # permit overriding by - # debugging interrupts - movm [d2,d3,a2,a3,exreg0],(sp) - - movhu (IAGR),a2 # see if which interrupt is - # pending - and IAGR_GN,a2 - add a2,a2 - add mn10300_serial_int_tbl,a2 - - mov (a2+),a3 - mov (__iobase,a3),e2 - mov (a2),a2 - jmp (a2) - -############################################################################### -# -# serial port receive interrupt virtual DMA entry point -# - intended to run at interrupt priority 1 (not affected by local_irq_disable) -# - stores data/status byte pairs in the ring buffer -# - induces a scheduler tick timer interrupt when done, which we then subvert -# on entry: -# A3 struct mn10300_serial_port * -# E2 I/O port base -# -############################################################################### -ENTRY(mn10300_serial_vdma_rx_handler) - mov (__rx_icr,a3),e3 - mov GxICR_DETECT,d2 - movbu d2,(e3) # ACK the interrupt - movhu (e3),d2 # flush - - mov (__rx_inp,a3),d3 - mov d3,a2 - add 2,d3 - and MNSC_BUFFER_SIZE-1,d3 - mov (__rx_outp,a3),d2 - cmp d3,d2 - beq mnsc_vdma_rx_overflow - - mov (__rx_buffer,a3),d2 - add d2,a2 - movhu (SCxSTR,e2),d2 - movbu d2,(1,a2) - movbu (SCxRXB,e2),d2 - movbu d2,(a2) - mov d3,(__rx_inp,a3) - bset MNSCx_RX_AVAIL,(__intr_flags,a3) - -mnsc_vdma_rx_done: - mov (__tm_icr,a3),a2 - mov GxICR_LEVEL_6|GxICR_ENABLE|GxICR_REQUEST|GxICR_DETECT,d2 - movhu d2,(a2) # request a slow interrupt - movhu (a2),d2 # flush - - movm (sp),[d2,d3,a2,a3,exreg0] - rti - -mnsc_vdma_rx_overflow: - bset MNSCx_RX_OVERF,(__intr_flags,a3) - bra mnsc_vdma_rx_done - -############################################################################### -# -# serial port transmit interrupt virtual DMA entry point -# - intended to run at interrupt priority 1 (not affected by local_irq_disable) -# - retrieves data bytes from the ring buffer and passes them to the serial port -# - induces a scheduler tick timer interrupt when done, which we then subvert -# A3 struct mn10300_serial_port * -# E2 I/O port base -# -############################################################################### - .balign L1_CACHE_BYTES -ENTRY(mn10300_serial_vdma_tx_handler) - mov (__tx_icr,a3),e3 - mov GxICR_DETECT,d2 - movbu d2,(e3) # ACK the interrupt - movhu (e3),d2 # flush - - btst 0xFF,(__tx_flags,a3) # handle transmit flags - bne mnsc_vdma_tx_flags - - movbu (SCxSTR,e2),d2 # don't try and transmit a char if the - # buffer is not empty - btst SC01STR_TBF,d2 # (may have tried to jumpstart) - bne mnsc_vdma_tx_noint - - movbu (__tx_xchar,a3),d2 # handle hi-pri XON/XOFF - or d2,d2 - bne mnsc_vdma_tx_xchar - - mov (__uart_state,a3),a2 # see if the TTY Tx queue has anything in it - mov (__xmit_tail,a2),d3 - mov (__xmit_head,a2),d2 - cmp d3,d2 - beq mnsc_vdma_tx_empty - - mov (__xmit_buffer,a2),d2 # get a char from the buffer and - # transmit it - movbu (d3,d2),d2 - movbu d2,(SCxTXB,e2) # Tx - - inc d3 # advance the buffer pointer - and __UART_XMIT_SIZE-1,d3 - mov (__xmit_head,a2),d2 - mov d3,(__xmit_tail,a2) - - sub d3,d2 # see if we've written everything - beq mnsc_vdma_tx_empty - - and __UART_XMIT_SIZE-1,d2 # see if we just made a hole - cmp __UART_XMIT_SIZE-2,d2 - beq mnsc_vdma_tx_made_hole - -mnsc_vdma_tx_done: - mov (__tm_icr,a3),a2 - mov GxICR_LEVEL_6|GxICR_ENABLE|GxICR_REQUEST|GxICR_DETECT,d2 - movhu d2,(a2) # request a slow interrupt - movhu (a2),d2 # flush - -mnsc_vdma_tx_noint: - movm (sp),[d2,d3,a2,a3,exreg0] - rti - -mnsc_vdma_tx_empty: - mov +(NUM2GxICR_LEVEL(CONFIG_MN10300_SERIAL_IRQ_LEVEL)|GxICR_DETECT),d2 - movhu d2,(e3) # disable the interrupt - movhu (e3),d2 # flush - - bset MNSCx_TX_EMPTY,(__intr_flags,a3) - bra mnsc_vdma_tx_done - -mnsc_vdma_tx_flags: - btst MNSCx_TX_STOP,(__tx_flags,a3) - bne mnsc_vdma_tx_stop - movhu (SCxCTR,e2),d2 # turn on break mode - or SC01CTR_BKE,d2 - movhu d2,(SCxCTR,e2) -mnsc_vdma_tx_stop: - mov +(NUM2GxICR_LEVEL(CONFIG_MN10300_SERIAL_IRQ_LEVEL)|GxICR_DETECT),d2 - movhu d2,(e3) # disable transmit interrupts on this - # channel - movhu (e3),d2 # flush - bra mnsc_vdma_tx_noint - -mnsc_vdma_tx_xchar: - bclr 0xff,(__tx_xchar,a3) - movbu d2,(SCxTXB,e2) - bra mnsc_vdma_tx_done - -mnsc_vdma_tx_made_hole: - bset MNSCx_TX_SPACE,(__intr_flags,a3) - bra mnsc_vdma_tx_done |