| /* |
| * 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" |
