mirror of
https://github.com/edk2-porting/linux-next.git
synced 2024-12-22 04:03:58 +08:00
2f2a2132ff
MN10300 arch headers and place them instead in the same directories as contain the .c files for the processor and unit implementations. This permits the symlinks include/asm/proc and include/asm/unit to be dispensed with. This does, however, require that #include <asm/proc/xxx.h> be converted to #include <proc/xxx.h> and similarly for asm/unit -> unit. Signed-off-by: David Howells <dhowells@redhat.com>
192 lines
5.2 KiB
ArmAsm
192 lines
5.2 KiB
ArmAsm
###############################################################################
|
|
#
|
|
# 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 0x01,(__tx_break,a3) # handle transmit break request
|
|
bne mnsc_vdma_tx_break
|
|
|
|
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 (__tx_info_buffer,a3),a2 # get the uart_info struct for Tx
|
|
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 +(GxICR_LEVEL_1|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_break:
|
|
movhu (SCxCTR,e2),d2 # turn on break mode
|
|
or SC01CTR_BKE,d2
|
|
movhu d2,(SCxCTR,e2)
|
|
mov +(GxICR_LEVEL_1|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
|