edb7xxx_misc.c

eCos1.31版

    COEOI,  // CYGNUM_HAL_INTERRUPT_CSINT      5
    0,      // CYGNUM_HAL_INTERRUPT_EINT1      6    
    0,      // CYGNUM_HAL_INTERRUPT_EINT2      7
    0,      // CYGNUM_HAL_INTERRUPT_EINT3      8
    TC1EOI, // CYGNUM_HAL_INTERRUPT_TC1OI      9
    TC2EOI, // CYGNUM_HAL_INTERRUPT_TC2OI      10
    RTCEOI, // CYGNUM_HAL_INTERRUPT_RTCMI      11
    TEOI,   // CYGNUM_HAL_INTERRUPT_TINT       12
    0,      // CYGNUM_HAL_INTERRUPT_UTXINT1    13
    0,      // CYGNUM_HAL_INTERRUPT_URXINT1    14
    UMSEOI, // CYGNUM_HAL_INTERRUPT_UMSINT     15
    0,      // CYGNUM_HAL_INTERRUPT_SSEOTI     16
    KBDEOI, // CYGNUM_HAL_INTERRUPT_KBDINT     17
    0,      // CYGNUM_HAL_INTERRUPT_SS2RX      18
    0,      // CYGNUM_HAL_INTERRUPT_SS2TX      19
    0,      // CYGNUM_HAL_INTERRUPT_UTXINT2    20
    0,      // CYGNUM_HAL_INTERRUPT_URXINT2    21
#if defined(__EDB7211)
    0,      // CYGNUM_HAL_INTERRUPT_MCPINT     22
#endif
#if defined(__EDB7209)
    0,      // CYGNUM_HAL_INTERRUPT_I2SINT     22
#endif
};

static struct regmap {
    int        first_int, last_int;
    cyg_uint32 stat_reg, mask_reg;
} hal_interrupt_status_regmap[] = {
    { CYGNUM_HAL_INTERRUPT_EXTFIQ, CYGNUM_HAL_INTERRUPT_SSEOTI,  INTSR1, INTMR1},
    { CYGNUM_HAL_INTERRUPT_KBDINT, CYGNUM_HAL_INTERRUPT_URXINT2, INTSR2, INTMR2},
#if defined(__EDB7211)
    { CYGNUM_HAL_INTERRUPT_MCPINT, CYGNUM_HAL_INTERRUPT_MCPINT,  INTSR3, INTMR3},
#endif
#if defined(__EDB7209)
    { CYGNUM_HAL_INTERRUPT_I2SINT, CYGNUM_HAL_INTERRUPT_I2SINT,  INTSR3, INTMR3},
#endif
    { 0, 0, 0}
};

#ifdef CYGHWR_HAL_ARM_EDB7XXX_BATLOW
// This ISR is called when the battery low interrupt occurs
int 
cyg_hal_batlow_isr(cyg_vector_t vector, cyg_addrword_t data, HAL_SavedRegisters *regs)
{
    diag_printf("Battery low\n");
    cyg_drv_interrupt_mask(CYGNUM_HAL_INTERRUPT_BLINT);
    // Presumably, one would leave this masked until the battery changed
    cyg_drv_interrupt_acknowledge(CYGNUM_HAL_INTERRUPT_BLINT);
    return 0;  // No need to run DSR
}
#endif

//
// Early stage hardware initialization
//   Some initialization has already been done before we get here.  For now
// just set up the interrupt environment.

void hal_hardware_init(void)
{
    volatile cyg_uint32 *icr;
    int vector;
    // Clear and initialize instruction cache
    HAL_ICACHE_INVALIDATE_ALL();
    HAL_ICACHE_ENABLE();
    // Any hardware/platform initialization that needs to be done.
    *(volatile cyg_uint32 *)INTMR1 = 0;
    *(volatile cyg_uint32 *)INTMR2 = 0;
#if !defined(__CL7111)
    *(volatile cyg_uint32 *)INTMR3 = 0;
    *(volatile cyg_uint8 *)SYSCON3 = SYSCON3_CLKCTL(CPU_CLOCK);
#endif
#if 0
    diag_printf("IMR1: %04x, IMR2: %04x\n",
                *(volatile cyg_uint32 *)INTMR1,
                *(volatile cyg_uint32 *)INTMR2);
    diag_printf("Memcfg1: %08x, Memcfg2: %08x, DRAM refresh: %08x\n", 
                *(volatile cyg_uint32 *)MEMCFG1,
                *(volatile cyg_uint32 *)MEMCFG2,
                *(volatile cyg_uint8 *)DRFPR);
#endif
#define MEMCFG_BUS_WIDTH(n)   (n<<0)
#define MEMCFG_BUS_WIDTH_32   (0<<0)
#define MEMCFG_BUS_WIDTH_16   (1<<0)
#define MEMCFG_BUS_WIDTH_8    (2<<0)
#define MEMCFG_WAIT_STATES(n) (n<<2)     // 0 is max, 15 min
#define MEMCFG_SQAEN          (1<<6)
#define MEMCFG_CLKENB         (1<<7)

// These need to be checked/improved
#define CS0_CONFIG MEMCFG_BUS_WIDTH_32 | MEMCFG_WAIT_STATES(3) | MEMCFG_SQAEN
#define CS1_CONFIG MEMCFG_BUS_WIDTH_32 | MEMCFG_WAIT_STATES(4)
#define CS2_CONFIG MEMCFG_BUS_WIDTH_32 | MEMCFG_WAIT_STATES(0)
#define CS3_CONFIG MEMCFG_BUS_WIDTH_32 | MEMCFG_WAIT_STATES(0)
#define CS4_CONFIG MEMCFG_BUS_WIDTH_32 | MEMCFG_WAIT_STATES(0)
#define CS5_CONFIG MEMCFG_BUS_WIDTH_32 | MEMCFG_WAIT_STATES(0)
#define CS6_CONFIG MEMCFG_BUS_WIDTH_32 | MEMCFG_WAIT_STATES(0)
#define CS7_CONFIG MEMCFG_BUS_WIDTH_32 | MEMCFG_WAIT_STATES(0)

#if defined(__EDB7209)
    *(volatile cyg_uint32 *)MEMCFG1 = 
        (CS0_CONFIG << 0) |       // FLASH rom
        (CS1_CONFIG << 8) |       // NAND flash
        (CS2_CONFIG << 16) |      // Ethernet
        (CS3_CONFIG << 24);       // Parallel printer, keyboard, touch panel
    *(volatile cyg_uint32 *)MEMCFG2 = 
        (CS4_CONFIG << 0) |       // USB
        (CS5_CONFIG << 8) |       // Expansion
        (CS6_CONFIG << 16) |      // Local SRAM
        (CS7_CONFIG << 24);       // Boot ROM
    // This value came from Cirrus, but doesn't match the recommendations above?
    *(volatile cyg_uint32 *)MEMCFG1 = 0x3C001814;
    // Set up GPIO lines
    *(volatile cyg_uint8 *)PADDR   = 0x00;  // Keyboard data 0-7 input
    *(volatile cyg_uint8 *)PBDDR   = 0xFA;  // 0 - I/O on J22
                                            // 1 - RTS on UART1
                                            // 2 - Ring on UART1
                                            // 3 - SSI header, Pin 13
                                            // 4 - NAND Command Latch Enable
                                            // 5 - NAND Address Latch Enable
                                            // 6 - On-board NAND Select (active low)
                                            // 7 - SmartMedia Card Enable (active low)
    *(volatile cyg_uint8 *)PBDR    = 0xC0;  // Everything off
    *(volatile cyg_uint8 *)PDDDR   = 0x40;  // 0 - Diagnostic LED control
                                            // 1 - Enable DC-DC converter for LCD
                                            // 2 - Enable LCD
                                            // 3 - ENable LCD Backlight
                                            // 4 - CS4342 I2C Data
                                            // 5 - CS4342 I2C Clock
                                            // 6 - SmartMedia Presence indicator
                                            // 7 - I/O on J22
    *(volatile cyg_uint8 *)PDDR    = 0x00;  // Everything off
    *(volatile cyg_uint8 *)PEDDR   = 0x05;  // 0 - Codec or ADC/DAC
                                            // 1 - I/O on JP38 (0 when inserted)
                                            // 2 - Enable touch panel
    *(volatile cyg_uint8 *)PEDR    = 0x01;  // Enable audio (not CODEC)
    // Initialize system control
    *(volatile cyg_uint32 *)SYSCON2 = SYSCON2_KBWEN;
#endif
    // Reset all interrupt masks (disable all interrupt sources)
    for (vector = CYGNUM_HAL_ISR_MIN;  vector < CYGNUM_HAL_ISR_COUNT;  vector++) {
        icr = (volatile cyg_uint32 *)hal_interrupt_clear_map[vector];
        if (icr) *icr = 0;  // Just a write clears the latch
    }
    // Turn on the DIAG LED to let the world know the board is alive
    *(volatile unsigned char *)LEDFLSH = LEDFLSH_ENABLE|LEDFLSH_DUTY(16)|LEDFLSH_PERIOD(1);
#ifdef CYGHWR_HAL_ARM_EDB7XXX_BATLOW
    cyg_drv_interrupt_create(CYGNUM_HAL_INTERRUPT_BLINT,
                             99,                     // Priority - what goes here?
                             0,                      //  Data item passed to interrupt handler
                             cyg_hal_batlow_isr,
                             0,
                             &batlow_interrupt_handle,
                             &batlow_interrupt);
    cyg_drv_interrupt_attach(batlow_interrupt_handle);
    cyg_drv_interrupt_unmask(CYGNUM_HAL_INTERRUPT_BLINT);
#endif
}

//
// This routine is called to respond to a hardware interrupt (IRQ).  It
// should interrogate the hardware and return the IRQ vector number.

// This code is a little convoluted to keep it general while still avoiding
// reading the hardware a lot, since the interrupt status is split across
// three separate registers.

int hal_spurious_ints;

int hal_IRQ_handler(void)
{
    struct regmap *map = hal_interrupt_status_regmap;
    cyg_uint32 stat;
    int vector;
    while (map->first_int) {
        stat = *(volatile cyg_uint32 *)map->stat_reg & *(volatile cyg_uint32 *)map->mask_reg;
        for (vector = map->first_int;  vector <= map->last_int;  vector++) {
            if (stat & hal_interrupt_bitmap[vector]) return vector;
        }
        map++;  // Next interrupt status register
    }
    hal_spurious_ints++;
    return CYGNUM_HAL_INTERRUPT_unused; // This shouldn't happen!
}

//
// Interrupt control
//

void hal_interrupt_mask(int vector)
{
    volatile cyg_uint32 *imr;
    imr = (volatile cyg_uint32 *)hal_interrupt_mask_regmap[vector];
    *imr &= ~hal_interrupt_bitmap[vector];
}

void hal_interrupt_unmask(int vector)
{
    volatile cyg_uint32 *imr;
    imr = (volatile cyg_uint32 *)hal_interrupt_mask_regmap[vector];
    *imr |= hal_interrupt_bitmap[vector];
}

void hal_interrupt_acknowledge(int vector)
{
    // Some interrupt sources have a register for this.
    volatile cyg_uint8 *icr;
    icr = (volatile cyg_uint8 *)hal_interrupt_clear_map[vector];
    if (icr) {
        *icr = 0;  // Any data clears interrupt
    }
}

void hal_interrupt_configure(int vector, int level, int up)
{
    // No interrupts are configurable on this hardware
}

void hal_interrupt_set_level(int vector, int level)
{
    // No interrupts are configurable on this hardware
}

/*------------------------------------------------------------------------*/
// EOF hal_misc.c