CARD_EXIST
card_exist &= CARD_EXIST;
pcr->card_exist = rtsx_pci_readl(pcr, RTSX_BIPR) & CARD_EXIST;
irq_status &= CARD_EXIST;
rtsx_usb_add_cmd(ucr, READ_REG_CMD, CARD_EXIST, 0x00, 0x00);