int is_sd_accessible(void)
{
volatile unsigned int present_state;
int timer=0;
xil_printf("check SD card accessibility \n");
#if 0
IN8(XPAR_LOGISDHC_0_REGS_BASEADDR+0x2F) = 0x01; // Soft reset
IN16(XPAR_LOGISDHC_0_REGS_BASEADDR+0x2C) = 0x205; // Clock ctrl reg; SD clock frequency = 50MHz/2, SD clk en, Internal clk en
IN8(XPAR_LOGISDHC_0_REGS_BASEADDR+0x28) = 0x00; // Host ctrl reg; High speed disabled, Data trans width = 1, (0x06; Host ctrl reg; High speed enabled, Data trans width = 4) ; 0x04 High speed
IN8(XPAR_LOGISDHC_0_REGS_BASEADDR+0x29) = 0x0F; // Power ctrl reg; SD Bus voltage select, SD Bus Power
IN16(XPAR_LOGISDHC_0_REGS_BASEADDR+0x36) = 0xFFFF; // Error interrupt status en reg; Enable all
IN16(XPAR_LOGISDHC_0_REGS_BASEADDR+0x34) = 0xFFFF; // Normal interrupt status en reg; Enable all
IN16(XPAR_LOGISDHC_0_REGS_BASEADDR+0x38) = 0x0008; // Normal interrupt signal en reg; Enable all
IN16(XPAR_LOGISDHC_0_REGS_BASEADDR+0x3A) = 0x0000; // Error interrupt signal en reg; dis Enable all
#endif
for(timer=0; timer < 100; timer++)
{
present_state = IN32(XPAR_LOGISDHC_0_REGS_BASEADDR+0x24+0); //Check Present state reg (bit 0 and 1) before doing anything
if((present_state & 0x3) == 0)
break;
}
present_state = IN32(XPAR_LOGISDHC_0_REGS_BASEADDR+0x24+0); //Check Present state reg (bit 0 and 1) before doing anything
if((present_state & 0x3) != 0)
return -1; // BAD, SD card is not accessible.
return 0; // GOOD, SD card is accessible.
}
GLOBAL VOID
IN32 IFN2(
IU32 *, pop1, /* pntr to dst operand */
IU32, op2 /* src(port nr.) operand */
)
{
#ifndef PIG
IU32 temp;
#ifdef SFELLOW
(*Ios_ind_function[Ios_in_adapter_table[(IO_ADDR)op2 &
(PC_IO_MEM_SIZE-1)]])
((IO_ADDR)op2, &temp);
*pop1 = temp;
#else
IN16(&temp, op2);
*pop1 = temp;
IN16(&temp, op2 + 2);
*pop1 += temp << 16;
#endif
#endif /* !PIG */
}
