hal_platform_setup.h

开放源码实时操作系统源码.

        nop                                                                ;


// Allow clock switching: very early in the startup
#define ALLOW_CLOCK_SWITCHING                                              \
        mov     r0, #0                                                     ;\
        mcr     p15,0,r0,c15,c1,2                                          ;\


// Depending on jumper settings, either ignore or initialize the XBus.
#define INIT_XBUS_ACCESS                                                    \
        ldr     r1, =SA110_XBUS_CYCLE_ARBITER                              ;\
        ldr     r0, [r1]                                                   ;\
        tsts    r0, #SA110_XBUS_CYCLE_ARBITER_ENABLED                      ;\
        beq     777f                                                       ;\
        /* PCI arbiter enabled, so don't touch the XBus */                 ;\
        ldr     r0, =SA110_CONTROL                                         ;\
        ldr     r1, =0x04aa0000                                            ;\
        str     r1, [r0]                                                   ;\
        b       778f                                                       ;\
                                                                           ;\
        /* set up XBus so we can read switch and write to LEDs */          ;\
777:    ldr     r0, =SA110_CONTROL                                         ;\
        ldr     r1, =0x64aa0000                                            ;\
        str     r1, [r0]                                                   ;\
        ldr     r0, =SA110_XBUS_CYCLE_ARBITER                              ;\
        ldr     r1, =0x100016db                                            ;\
        str     r1, [r0]                                                   ;\
        ldr     r0, =SA110_XBUS_IO_STROBE_MASK                             ;\
        ldr     r1, =0xfcfcfcfc                                            ;\
        str     r1, [r0]                                                   ;\
778:                                                                       ;\
        
// Save lr and call mem init code
#define CALL_MEMINIT_CODE                                                 \
        mov     r10, lr       /* preserve lr */                           ;\
        bl      __mem285_init                                             ;\
        ldr     r1, =hal_dram_size  /* [see hal_intr.h] */                ;\
        str     r0, [ r1 ]    /* store the top of memory address */       ;\
        mov     lr, r10       /* in hal_dram_size for future use */       ;\
        
// If we are doing a ROMRAM startup copy all sections up to the start of 
// the data section to RAM.
#if defined(CYG_HAL_STARTUP_ROMRAM)
#define ROMRAM_COPY                                                      \
        ldr     r0,=(CYGMEM_REGION_rom)                                  ;\
        ldr     r1,=0                                                    ;\
        ldr     r2,=0x40                                                 ;\
810:    ldr     r3,[r0],#4                                               ;\
        str     r3,[r1],#4                                               ;\
        cmp     r1,r2                                                    ;\
        bne     810b                                                     ;\
        ldr     r0,=(CYGMEM_REGION_rom+reset_vector)                     ;\
        ldr     r1,=(reset_vector)                                       ;\
        ldr     r2,=(CYGMEM_REGION_rom_SIZE)                             ;\
820:    ldr     r3,[r0],#4                                               ;\
        str     r3,[r1],#4                                               ;\
        cmp     r1,r2                                                    ;\
        bne     820b                                                     ;\
        ldr     r0,=830f                                                 ;\
        mov     pc,r0                                                    ;\
830:                                                                   
#else
#define ROMRAM_COPY                                                      
#endif

#define BASIC_PCI_SETUP                                                   \
        /**************************************************************** \
         *  Basic PCI setup.                                              \
         ****************************************************************/\
        ldr     r0, =SA110_CONTROL_STATUS_BASE                            ;\
                                                                          ;\
        /* Disable PCI Outbound interrupts */                             ;\
        mov     r1, #12                                                   ;\
        str     r1, [r0, #SA110_OUT_INT_MASK_o]                           ;\
                                                                          ;\
        /* Disable Doorbells */                                           ;\
        mov     r1, #0                                                    ;\
        str     r1, [r0, #SA110_DOORBELL_PCI_MASK_o]                      ;\
        str     r1, [r0, #SA110_DOORBELL_SA_MASK_o]                       ;\
                                                                          ;\
        /* Map high PCI address bits to 0 */                              ;\
        str     r1, [r0, #SA110_PCI_ADDR_EXT_o]                           ;\
                                                                          ;\
        /* Interrupt ID to 1 */                                           ;\
        mov     r1, #0x100                                                ;\
        str     r1, [r0, #SA110_PCI_CFG_INT_LINE_o]                       ;\
                                                                          ;\
        /* Remove PCI_reset */                                            ;\
        ldr     r1, [r0, #SA110_CONTROL_o]                                ;\
        orr     r1, r1, #0x200                                            ;\
        str     r1, [r0, #SA110_CONTROL_o]                                ;\
                                                                          ;\
        /* Open a 2MB window */                                           ;\
        mov     r1, #0x1c0000                                             ;\
        str     r1,[r0, #SA110_SDRAM_BASE_ADDRESS_MASK_o]                 ;\
        mov     r1, #0xe00000                                             ;\
        str     r1,[r0, #SA110_SDRAM_BASE_ADDRESS_OFFSET_o]               ;\
                                                                          ;\
        /* Only init PCI if central function is set and */                ;\
        /* standalone bit is cleared                    */                ;\
        ldr     r1, [r0, #SA110_CONTROL_o]                                ;\
        tst     r1, #SA110_CONTROL_CFN                                    ;\
        beq     1f                                                        ;\
                                                                          ;\
        ldr     r1, =0x40012000                                           ;\
        ldr     r1, [r1]                                                  ;\
        tst     r1, #0x40                                                 ;\
        bne     1f                                                        ;\
                                                                          ;\
        /* Don't respond to any commands */                               ;\
        mov     r1, #0                                                    ;\
        str     r1, [r0, #SA110_PCI_CFG_COMMAND_o]                        ;\
                                                                          ;\
        str     r1, [r0, #SA110_PCI_CFG_SDRAM_BAR_o]                      ;\
        mov     r1, #0x40000000                                           ;\
        str     r1, [r0, #SA110_PCI_CFG_CSR_MEM_BAR_o]                    ;\
        mov     r1, #0xf000                                               ;\
        str     r1, [r0, #SA110_PCI_CFG_CSR_IO_BAR_o]                     ;\
                                                                          ;\
        /* respond to I/O space & Memory transactions. */                 ;\
        mov     r1, #0x17                                                 ;\
        str     r1, [r0, #SA110_PCI_CFG_COMMAND_o]                        ;\
    1:                                                                    ;\
        /* Signal PCI_init_complete */                                    ;\
        ldr     r1, [r0, #SA110_CONTROL_o]                                ;\
        orr     r1, r1, #SA110_CONTROL_INIT_COMPLETE                      ;\
        str     r1, [r0, #SA110_CONTROL_o]                                ;\
        

/*---------------------------------------------------------------------------*/
/* end of hal_platform_setup.h                                               */
#endif /* CYGONCE_HAL_PLATFORM_SETUP_H */