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|
/* SPDX-License-Identifier: GPL-2.0 */
/*
* Head of the kernel - alter with care
*
* Copyright (C) 2000, 2001, 2010 Axis Communications AB
*
*/
#include <linux/init.h>
#define ASSEMBLER_MACROS_ONLY
/* The IO_* macros use the ## token concatenation operator, so
-traditional must not be used when assembling this file. */
#include <arch/sv_addr_ag.h>
#define CRAMFS_MAGIC 0x28cd3d45
#define RAM_INIT_MAGIC 0x56902387
#define COMMAND_LINE_MAGIC 0x87109563
#define START_ETHERNET_CLOCK IO_STATE(R_NETWORK_GEN_CONFIG, enable, on) |\
IO_STATE(R_NETWORK_GEN_CONFIG, phy, mii_clk)
;; exported symbols
.globl etrax_irv
.globl romfs_start
.globl romfs_length
.globl romfs_in_flash
.globl swapper_pg_dir
__HEAD
;; This is the entry point of the kernel. We are in supervisor mode.
;; 0x00000000 if Flash, 0x40004000 if DRAM
;; since etrax actually starts at address 2 when booting from flash, we
;; put a nop (2 bytes) here first so we dont accidentally skip the di
;;
;; NOTICE! The registers r8 and r9 are used as parameters carrying
;; information from the decompressor (if the kernel was compressed).
;; They should not be used in the code below until read.
nop
di
;; First setup the kseg_c mapping from where the kernel is linked
;; to 0x40000000 (where the actual DRAM resides) otherwise
;; we cannot do very much! See arch/cris/README.mm
;;
;; Notice that since we're potentially running at 0x00 or 0x40 right now,
;; we will get a fault as soon as we enable the MMU if we dont
;; temporarily map those segments linearily.
;;
;; Due to a bug in Etrax-100 LX version 1 we need to map the memory
;; slightly different. The bug is that you can't remap bit 31 of
;; an address. Though we can check the version register for
;; whether the bug is present, some constants would then have to
;; be variables, so we don't. The drawback is that you can "only" map
;; 1G per process with CONFIG_CRIS_LOW_MAP.
#ifdef CONFIG_CRIS_LOW_MAP
; kseg mappings, temporary map of 0xc0->0x40
move.d IO_FIELD (R_MMU_KBASE_HI, base_c, 4) \
| IO_FIELD (R_MMU_KBASE_HI, base_b, 0xb) \
| IO_FIELD (R_MMU_KBASE_HI, base_9, 9) \
| IO_FIELD (R_MMU_KBASE_HI, base_8, 8), $r0
move.d $r0, [R_MMU_KBASE_HI]
; temporary map of 0x40->0x40 and 0x60->0x40
move.d IO_FIELD (R_MMU_KBASE_LO, base_6, 4) \
| IO_FIELD (R_MMU_KBASE_LO, base_4, 4), $r0
move.d $r0, [R_MMU_KBASE_LO]
; mmu enable, segs e,c,b,a,6,5,4,0 segment mapped
move.d IO_STATE (R_MMU_CONFIG, mmu_enable, enable) \
| IO_STATE (R_MMU_CONFIG, inv_excp, enable) \
| IO_STATE (R_MMU_CONFIG, acc_excp, enable) \
| IO_STATE (R_MMU_CONFIG, we_excp, enable) \
| IO_STATE (R_MMU_CONFIG, seg_f, page) \
| IO_STATE (R_MMU_CONFIG, seg_e, seg) \
| IO_STATE (R_MMU_CONFIG, seg_d, page) \
| IO_STATE (R_MMU_CONFIG, seg_c, seg) \
| IO_STATE (R_MMU_CONFIG, seg_b, seg) \
| IO_STATE (R_MMU_CONFIG, seg_a, seg) \
| IO_STATE (R_MMU_CONFIG, seg_9, page) \
| IO_STATE (R_MMU_CONFIG, seg_8, page) \
| IO_STATE (R_MMU_CONFIG, seg_7, page) \
| IO_STATE (R_MMU_CONFIG, seg_6, seg) \
| IO_STATE (R_MMU_CONFIG, seg_5, seg) \
| IO_STATE (R_MMU_CONFIG, seg_4, seg) \
| IO_STATE (R_MMU_CONFIG, seg_3, page) \
| IO_STATE (R_MMU_CONFIG, seg_2, page) \
| IO_STATE (R_MMU_CONFIG, seg_1, page) \
| IO_STATE (R_MMU_CONFIG, seg_0, seg), $r0
move.d $r0, [R_MMU_CONFIG]
#else
; kseg mappings
move.d IO_FIELD (R_MMU_KBASE_HI, base_e, 8) \
| IO_FIELD (R_MMU_KBASE_HI, base_c, 4) \
| IO_FIELD (R_MMU_KBASE_HI, base_b, 0xb), $r0
move.d $r0, [R_MMU_KBASE_HI]
; temporary map of 0x40->0x40 and 0x00->0x00
move.d IO_FIELD (R_MMU_KBASE_LO, base_4, 4), $r0
move.d $r0, [R_MMU_KBASE_LO]
; mmu enable, segs f,e,c,b,4,0 segment mapped
move.d IO_STATE (R_MMU_CONFIG, mmu_enable, enable) \
| IO_STATE (R_MMU_CONFIG, inv_excp, enable) \
| IO_STATE (R_MMU_CONFIG, acc_excp, enable) \
| IO_STATE (R_MMU_CONFIG, we_excp, enable) \
| IO_STATE (R_MMU_CONFIG, seg_f, seg) \
| IO_STATE (R_MMU_CONFIG, seg_e, seg) \
| IO_STATE (R_MMU_CONFIG, seg_d, page) \
| IO_STATE (R_MMU_CONFIG, seg_c, seg) \
| IO_STATE (R_MMU_CONFIG, seg_b, seg) \
| IO_STATE (R_MMU_CONFIG, seg_a, page) \
| IO_STATE (R_MMU_CONFIG, seg_9, page) \
| IO_STATE (R_MMU_CONFIG, seg_8, page) \
| IO_STATE (R_MMU_CONFIG, seg_7, page) \
| IO_STATE (R_MMU_CONFIG, seg_6, page) \
| IO_STATE (R_MMU_CONFIG, seg_5, page) \
| IO_STATE (R_MMU_CONFIG, seg_4, seg) \
| IO_STATE (R_MMU_CONFIG, seg_3, page) \
| IO_STATE (R_MMU_CONFIG, seg_2, page) \
| IO_STATE (R_MMU_CONFIG, seg_1, page) \
| IO_STATE (R_MMU_CONFIG, seg_0, seg), $r0
move.d $r0, [R_MMU_CONFIG]
#endif
;; Now we need to sort out the segments and their locations in RAM or
;; Flash. The image in the Flash (or in DRAM) consists of 3 pieces:
;; 1) kernel text, 2) kernel data, 3) ROM filesystem image
;; But the linker has linked the kernel to expect this layout in
;; DRAM memory:
;; 1) kernel text, 2) kernel data, 3) kernel BSS
;; (the location of the ROM filesystem is determined by the krom driver)
;; If we boot this from Flash, we want to keep the ROM filesystem in
;; the flash, we want to copy the text and need to copy the data to DRAM.
;; But if we boot from DRAM, we need to move the ROMFS image
;; from its position after kernel data, to after kernel BSS, BEFORE the
;; kernel starts using the BSS area (since its "overlayed" with the ROMFS)
;;
;; In both cases, we start in un-cached mode, and need to jump into a
;; cached PC after we're done fiddling around with the segments.
;;
;; arch/etrax100/etrax100.ld sets some symbols that define the start
;; and end of each segment.
;; Check if we start from DRAM or FLASH by testing PC
move.d $pc,$r0
and.d 0x7fffffff,$r0 ; get rid of the non-cache bit
cmp.d 0x10000,$r0 ; arbitrary... just something above this code
blo _inflash0
nop
jump _inram ; enter cached ram
;; Jumpgate for branches.
_inflash0:
jump _inflash
;; Put this in a suitable section where we can reclaim storage
;; after init.
__INIT
_inflash:
#ifdef CONFIG_ETRAX_ETHERNET
;; Start MII clock to make sure it is running when tranceiver is reset
move.d START_ETHERNET_CLOCK, $r0
move.d $r0, [R_NETWORK_GEN_CONFIG]
#endif
;; Set up waitstates etc according to kernel configuration.
move.d CONFIG_ETRAX_DEF_R_WAITSTATES, $r0
move.d $r0, [R_WAITSTATES]
move.d CONFIG_ETRAX_DEF_R_BUS_CONFIG, $r0
move.d $r0, [R_BUS_CONFIG]
;; We need to initialze DRAM registers before we start using the DRAM
cmp.d RAM_INIT_MAGIC, $r8 ; Already initialized?
beq _dram_init_finished
nop
#include "../lib/dram_init.S"
_dram_init_finished:
;; Copy text+data to DRAM
;; This is fragile - the calculation of r4 as the image size depends
;; on that the labels below actually are the first and last positions
;; in the linker-script.
;;
;; Then the locating of the cramfs image depends on the aforementioned
;; image being located in the flash at 0. This is most often not true,
;; thus the following does not work (normally there is a rescue-block
;; between the physical start of the flash and the flash-image start,
;; and when run with compression, the kernel is actually unpacked to
;; DRAM and we never get here in the first place :))
moveq 0, $r0 ; source
move.d text_start, $r1 ; destination
move.d __vmlinux_end, $r2 ; end destination
move.d $r2, $r4
sub.d $r1, $r4 ; r4=__vmlinux_end in flash, used below
1: move.w [$r0+], $r3
move.w $r3, [$r1+]
cmp.d $r2, $r1
blo 1b
nop
;; We keep the cramfs in the flash.
;; There might be none, but that does not matter because
;; we don't do anything than read some bytes here.
moveq 0, $r0
move.d $r0, [romfs_length] ; default if there is no cramfs
move.d [$r4], $r0 ; cramfs_super.magic
cmp.d CRAMFS_MAGIC, $r0
bne 1f
nop
move.d [$r4 + 4], $r0 ; cramfs_super.size
move.d $r0, [romfs_length]
#ifdef CONFIG_CRIS_LOW_MAP
add.d 0x50000000, $r4 ; add flash start in virtual memory (cached)
#else
add.d 0xf0000000, $r4 ; add flash start in virtual memory (cached)
#endif
move.d $r4, [romfs_start]
1:
moveq 1, $r0
move.d $r0, [romfs_in_flash]
jump _start_it ; enter code, cached this time
_inram:
;; Move the ROM fs to after BSS end. This assumes that the cramfs
;; second longword contains the length of the cramfs
moveq 0, $r0
move.d $r0, [romfs_length] ; default if there is no cramfs
;; The kernel could have been unpacked to DRAM by the loader, but
;; the cramfs image could still be in the Flash directly after the
;; compressed kernel image. The loader passes the address of the
;; byte succeeding the last compressed byte in the flash in the
;; register r9 when starting the kernel. Check if r9 points to a
;; decent cramfs image!
;; (Notice that if this is not booted from the loader, r9 will be
;; garbage but we do sanity checks on it, the chance that it points
;; to a cramfs magic is small.. )
cmp.d 0x0ffffff8, $r9
bhs _no_romfs_in_flash ; r9 points outside the flash area
nop
move.d [$r9], $r0 ; cramfs_super.magic
cmp.d CRAMFS_MAGIC, $r0
bne _no_romfs_in_flash
nop
move.d [$r9+4], $r0 ; cramfs_super.length
move.d $r0, [romfs_length]
#ifdef CONFIG_CRIS_LOW_MAP
add.d 0x50000000, $r9 ; add flash start in virtual memory (cached)
#else
add.d 0xf0000000, $r9 ; add flash start in virtual memory (cached)
#endif
move.d $r9, [romfs_start]
moveq 1, $r0
move.d $r0, [romfs_in_flash]
jump _start_it ; enter code, cached this time
_no_romfs_in_flash:
;; Check if there is a cramfs (magic value).
;; Notice that we check for cramfs magic value - which is
;; the "rom fs" we'll possibly use in 2.4 if not JFFS (which does
;; not need this mechanism anyway)
move.d __init_end, $r0; the image will be after the end of init
move.d [$r0], $r1 ; cramfs assumes same endian on host/target
cmp.d CRAMFS_MAGIC, $r1; magic value in cramfs superblock
bne 2f
nop
;; Ok. What is its size ?
move.d [$r0 + 4], $r2 ; cramfs_super.size (again, no need to swapwb)
;; We want to copy it to the end of the BSS
move.d _end, $r1
;; Remember values so cramfs and setup can find this info
move.d $r1, [romfs_start] ; new romfs location
move.d $r2, [romfs_length]
;; We need to copy it backwards, since they can be overlapping
add.d $r2, $r0
add.d $r2, $r1
;; Go ahead. Make my loop.
lsrq 1, $r2 ; size is in bytes, we copy words
1: move.w [$r0=$r0-2],$r3
move.w $r3,[$r1=$r1-2]
subq 1, $r2
bne 1b
nop
2:
;; Dont worry that the BSS is tainted. It will be cleared later.
moveq 0, $r0
move.d $r0, [romfs_in_flash]
jump _start_it ; better skip the additional cramfs check below
_start_it:
;; Check if kernel command line is supplied
cmp.d COMMAND_LINE_MAGIC, $r10
bne no_command_line
nop
move.d 256, $r13
move.d cris_command_line, $r10
or.d 0x80000000, $r11 ; Make it virtual
1:
move.b [$r11+], $r12
move.b $r12, [$r10+]
subq 1, $r13
bne 1b
nop
no_command_line:
;; the kernel stack is overlayed with the task structure for each
;; task. thus the initial kernel stack is in the same page as the
;; init_task (but starts in the top of the page, size 8192)
move.d init_thread_union + 8192, $sp
move.d ibr_start,$r0 ; this symbol is set by the linker script
move $r0,$ibr
move.d $r0,[etrax_irv] ; set the interrupt base register and pointer
;; Clear BSS region, from _bss_start to _end
move.d __bss_start, $r0
move.d _end, $r1
1: clear.d [$r0+]
cmp.d $r1, $r0
blo 1b
nop
;; Etrax product HW genconfig setup
moveq 0,$r0
;; Select or disable serial port 2
#ifdef CONFIG_ETRAX_SERIAL_PORT2
or.d IO_STATE (R_GEN_CONFIG, ser2, select),$r0
#else
or.d IO_STATE (R_GEN_CONFIG, ser2, disable),$r0
#endif
;; Init interfaces (disable them).
or.d IO_STATE (R_GEN_CONFIG, scsi0, disable) \
| IO_STATE (R_GEN_CONFIG, ata, disable) \
| IO_STATE (R_GEN_CONFIG, par0, disable) \
| IO_STATE (R_GEN_CONFIG, mio, disable) \
| IO_STATE (R_GEN_CONFIG, scsi1, disable) \
| IO_STATE (R_GEN_CONFIG, scsi0w, disable) \
| IO_STATE (R_GEN_CONFIG, par1, disable) \
| IO_STATE (R_GEN_CONFIG, ser3, disable) \
| IO_STATE (R_GEN_CONFIG, mio_w, disable) \
| IO_STATE (R_GEN_CONFIG, usb1, disable) \
| IO_STATE (R_GEN_CONFIG, usb2, disable) \
| IO_STATE (R_GEN_CONFIG, par_w, disable),$r0
;; Init DMA channel muxing (set to unused clients).
or.d IO_STATE (R_GEN_CONFIG, dma2, ata) \
| IO_STATE (R_GEN_CONFIG, dma3, ata) \
| IO_STATE (R_GEN_CONFIG, dma4, scsi1) \
| IO_STATE (R_GEN_CONFIG, dma5, scsi1) \
| IO_STATE (R_GEN_CONFIG, dma6, unused) \
| IO_STATE (R_GEN_CONFIG, dma7, unused) \
| IO_STATE (R_GEN_CONFIG, dma8, usb) \
| IO_STATE (R_GEN_CONFIG, dma9, usb),$r0
move.d $r0,[genconfig_shadow] ; init a shadow register of R_GEN_CONFIG
move.d $r0,[R_GEN_CONFIG]
#if 0
moveq 4,$r0
move.b $r0,[R_DMA_CH6_CMD] ; reset (ser0 dma out)
move.b $r0,[R_DMA_CH7_CMD] ; reset (ser0 dma in)
1: move.b [R_DMA_CH6_CMD],$r0 ; wait for reset cycle to finish
and.b 7,$r0
cmp.b 4,$r0
beq 1b
nop
1: move.b [R_DMA_CH7_CMD],$r0 ; wait for reset cycle to finish
and.b 7,$r0
cmp.b 4,$r0
beq 1b
nop
#endif
moveq IO_STATE (R_DMA_CH8_CMD, cmd, reset),$r0
move.b $r0,[R_DMA_CH8_CMD] ; reset (ser1 dma out)
move.b $r0,[R_DMA_CH9_CMD] ; reset (ser1 dma in)
1: move.b [R_DMA_CH8_CMD],$r0 ; wait for reset cycle to finish
andq IO_MASK (R_DMA_CH8_CMD, cmd),$r0
cmpq IO_STATE (R_DMA_CH8_CMD, cmd, reset),$r0
beq 1b
nop
1: move.b [R_DMA_CH9_CMD],$r0 ; wait for reset cycle to finish
andq IO_MASK (R_DMA_CH9_CMD, cmd),$r0
cmpq IO_STATE (R_DMA_CH9_CMD, cmd, reset),$r0
beq 1b
nop
;; setup port PA and PB default initial directions and data
;; including their shadow registers
move.b CONFIG_ETRAX_DEF_R_PORT_PA_DIR,$r0
move.b $r0,[port_pa_dir_shadow]
move.b $r0,[R_PORT_PA_DIR]
move.b CONFIG_ETRAX_DEF_R_PORT_PA_DATA,$r0
move.b $r0,[port_pa_data_shadow]
move.b $r0,[R_PORT_PA_DATA]
move.b CONFIG_ETRAX_DEF_R_PORT_PB_CONFIG,$r0
move.b $r0,[port_pb_config_shadow]
move.b $r0,[R_PORT_PB_CONFIG]
move.b CONFIG_ETRAX_DEF_R_PORT_PB_DIR,$r0
move.b $r0,[port_pb_dir_shadow]
move.b $r0,[R_PORT_PB_DIR]
move.b CONFIG_ETRAX_DEF_R_PORT_PB_DATA,$r0
move.b $r0,[port_pb_data_shadow]
move.b $r0,[R_PORT_PB_DATA]
moveq 0, $r0
move.d $r0,[port_pb_i2c_shadow]
move.d $r0, [R_PORT_PB_I2C]
moveq 0,$r0
move.d $r0,[port_g_data_shadow]
move.d $r0,[R_PORT_G_DATA]
;; setup the serial port 0 at 115200 baud for debug purposes
moveq IO_STATE (R_SERIAL0_XOFF, tx_stop, enable) \
| IO_STATE (R_SERIAL0_XOFF, auto_xoff, disable) \
| IO_FIELD (R_SERIAL0_XOFF, xoff_char, 0),$r0
move.d $r0,[R_SERIAL0_XOFF]
; 115.2kbaud for both transmit and receive
move.b IO_STATE (R_SERIAL0_BAUD, tr_baud, c115k2Hz) \
| IO_STATE (R_SERIAL0_BAUD, rec_baud, c115k2Hz),$r0
move.b $r0,[R_SERIAL0_BAUD]
; Set up and enable the serial0 receiver.
move.b IO_STATE (R_SERIAL0_REC_CTRL, dma_err, stop) \
| IO_STATE (R_SERIAL0_REC_CTRL, rec_enable, enable) \
| IO_STATE (R_SERIAL0_REC_CTRL, rts_, active) \
| IO_STATE (R_SERIAL0_REC_CTRL, sampling, middle) \
| IO_STATE (R_SERIAL0_REC_CTRL, rec_stick_par, normal) \
| IO_STATE (R_SERIAL0_REC_CTRL, rec_par, even) \
| IO_STATE (R_SERIAL0_REC_CTRL, rec_par_en, disable) \
| IO_STATE (R_SERIAL0_REC_CTRL, rec_bitnr, rec_8bit),$r0
move.b $r0,[R_SERIAL0_REC_CTRL]
; Set up and enable the serial0 transmitter.
move.b IO_FIELD (R_SERIAL0_TR_CTRL, txd, 0) \
| IO_STATE (R_SERIAL0_TR_CTRL, tr_enable, enable) \
| IO_STATE (R_SERIAL0_TR_CTRL, auto_cts, disabled) \
| IO_STATE (R_SERIAL0_TR_CTRL, stop_bits, one_bit) \
| IO_STATE (R_SERIAL0_TR_CTRL, tr_stick_par, normal) \
| IO_STATE (R_SERIAL0_TR_CTRL, tr_par, even) \
| IO_STATE (R_SERIAL0_TR_CTRL, tr_par_en, disable) \
| IO_STATE (R_SERIAL0_TR_CTRL, tr_bitnr, tr_8bit),$r0
move.b $r0,[R_SERIAL0_TR_CTRL]
;; setup the serial port 1 at 115200 baud for debug purposes
moveq IO_STATE (R_SERIAL1_XOFF, tx_stop, enable) \
| IO_STATE (R_SERIAL1_XOFF, auto_xoff, disable) \
| IO_FIELD (R_SERIAL1_XOFF, xoff_char, 0),$r0
move.d $r0,[R_SERIAL1_XOFF]
; 115.2kbaud for both transmit and receive
move.b IO_STATE (R_SERIAL1_BAUD, tr_baud, c115k2Hz) \
| IO_STATE (R_SERIAL1_BAUD, rec_baud, c115k2Hz),$r0
move.b $r0,[R_SERIAL1_BAUD]
; Set up and enable the serial1 receiver.
move.b IO_STATE (R_SERIAL1_REC_CTRL, dma_err, stop) \
| IO_STATE (R_SERIAL1_REC_CTRL, rec_enable, enable) \
| IO_STATE (R_SERIAL1_REC_CTRL, rts_, active) \
| IO_STATE (R_SERIAL1_REC_CTRL, sampling, middle) \
| IO_STATE (R_SERIAL1_REC_CTRL, rec_stick_par, normal) \
| IO_STATE (R_SERIAL1_REC_CTRL, rec_par, even) \
| IO_STATE (R_SERIAL1_REC_CTRL, rec_par_en, disable) \
| IO_STATE (R_SERIAL1_REC_CTRL, rec_bitnr, rec_8bit),$r0
move.b $r0,[R_SERIAL1_REC_CTRL]
; Set up and enable the serial1 transmitter.
move.b IO_FIELD (R_SERIAL1_TR_CTRL, txd, 0) \
| IO_STATE (R_SERIAL1_TR_CTRL, tr_enable, enable) \
| IO_STATE (R_SERIAL1_TR_CTRL, auto_cts, disabled) \
| IO_STATE (R_SERIAL1_TR_CTRL, stop_bits, one_bit) \
| IO_STATE (R_SERIAL1_TR_CTRL, tr_stick_par, normal) \
| IO_STATE (R_SERIAL1_TR_CTRL, tr_par, even) \
| IO_STATE (R_SERIAL1_TR_CTRL, tr_par_en, disable) \
| IO_STATE (R_SERIAL1_TR_CTRL, tr_bitnr, tr_8bit),$r0
move.b $r0,[R_SERIAL1_TR_CTRL]
#ifdef CONFIG_ETRAX_SERIAL_PORT2
;; setup the serial port 2 at 115200 baud for debug purposes
moveq IO_STATE (R_SERIAL2_XOFF, tx_stop, enable) \
| IO_STATE (R_SERIAL2_XOFF, auto_xoff, disable) \
| IO_FIELD (R_SERIAL2_XOFF, xoff_char, 0),$r0
move.d $r0,[R_SERIAL2_XOFF]
; 115.2kbaud for both transmit and receive
move.b IO_STATE (R_SERIAL2_BAUD, tr_baud, c115k2Hz) \
| IO_STATE (R_SERIAL2_BAUD, rec_baud, c115k2Hz),$r0
move.b $r0,[R_SERIAL2_BAUD]
; Set up and enable the serial2 receiver.
move.b IO_STATE (R_SERIAL2_REC_CTRL, dma_err, stop) \
| IO_STATE (R_SERIAL2_REC_CTRL, rec_enable, enable) \
| IO_STATE (R_SERIAL2_REC_CTRL, rts_, active) \
| IO_STATE (R_SERIAL2_REC_CTRL, sampling, middle) \
| IO_STATE (R_SERIAL2_REC_CTRL, rec_stick_par, normal) \
| IO_STATE (R_SERIAL2_REC_CTRL, rec_par, even) \
| IO_STATE (R_SERIAL2_REC_CTRL, rec_par_en, disable) \
| IO_STATE (R_SERIAL2_REC_CTRL, rec_bitnr, rec_8bit),$r0
move.b $r0,[R_SERIAL2_REC_CTRL]
; Set up and enable the serial2 transmitter.
move.b IO_FIELD (R_SERIAL2_TR_CTRL, txd, 0) \
| IO_STATE (R_SERIAL2_TR_CTRL, tr_enable, enable) \
| IO_STATE (R_SERIAL2_TR_CTRL, auto_cts, disabled) \
| IO_STATE (R_SERIAL2_TR_CTRL, stop_bits, one_bit) \
| IO_STATE (R_SERIAL2_TR_CTRL, tr_stick_par, normal) \
| IO_STATE (R_SERIAL2_TR_CTRL, tr_par, even) \
| IO_STATE (R_SERIAL2_TR_CTRL, tr_par_en, disable) \
| IO_STATE (R_SERIAL2_TR_CTRL, tr_bitnr, tr_8bit),$r0
move.b $r0,[R_SERIAL2_TR_CTRL]
#endif
#ifdef CONFIG_ETRAX_SERIAL_PORT3
;; setup the serial port 3 at 115200 baud for debug purposes
moveq IO_STATE (R_SERIAL3_XOFF, tx_stop, enable) \
| IO_STATE (R_SERIAL3_XOFF, auto_xoff, disable) \
| IO_FIELD (R_SERIAL3_XOFF, xoff_char, 0),$r0
move.d $r0,[R_SERIAL3_XOFF]
; 115.2kbaud for both transmit and receive
move.b IO_STATE (R_SERIAL3_BAUD, tr_baud, c115k2Hz) \
| IO_STATE (R_SERIAL3_BAUD, rec_baud, c115k2Hz),$r0
move.b $r0,[R_SERIAL3_BAUD]
; Set up and enable the serial3 receiver.
move.b IO_STATE (R_SERIAL3_REC_CTRL, dma_err, stop) \
| IO_STATE (R_SERIAL3_REC_CTRL, rec_enable, enable) \
| IO_STATE (R_SERIAL3_REC_CTRL, rts_, active) \
| IO_STATE (R_SERIAL3_REC_CTRL, sampling, middle) \
| IO_STATE (R_SERIAL3_REC_CTRL, rec_stick_par, normal) \
| IO_STATE (R_SERIAL3_REC_CTRL, rec_par, even) \
| IO_STATE (R_SERIAL3_REC_CTRL, rec_par_en, disable) \
| IO_STATE (R_SERIAL3_REC_CTRL, rec_bitnr, rec_8bit),$r0
move.b $r0,[R_SERIAL3_REC_CTRL]
; Set up and enable the serial3 transmitter.
move.b IO_FIELD (R_SERIAL3_TR_CTRL, txd, 0) \
| IO_STATE (R_SERIAL3_TR_CTRL, tr_enable, enable) \
| IO_STATE (R_SERIAL3_TR_CTRL, auto_cts, disabled) \
| IO_STATE (R_SERIAL3_TR_CTRL, stop_bits, one_bit) \
| IO_STATE (R_SERIAL3_TR_CTRL, tr_stick_par, normal) \
| IO_STATE (R_SERIAL3_TR_CTRL, tr_par, even) \
| IO_STATE (R_SERIAL3_TR_CTRL, tr_par_en, disable) \
| IO_STATE (R_SERIAL3_TR_CTRL, tr_bitnr, tr_8bit),$r0
move.b $r0,[R_SERIAL3_TR_CTRL]
#endif
jump start_kernel ; jump into the C-function start_kernel in init/main.c
.data
etrax_irv:
.dword 0
romfs_start:
.dword 0
romfs_length:
.dword 0
romfs_in_flash:
.dword 0
;; put some special pages at the beginning of the kernel aligned
;; to page boundaries - the kernel cannot start until after this
#ifdef CONFIG_CRIS_LOW_MAP
swapper_pg_dir = 0x60002000
#else
swapper_pg_dir = 0xc0002000
#endif
.section ".init.data", "aw"
#include "../lib/hw_settings.S"
|
