litex_read32
u32 pending = litex_read32(host->sdirq + LITEX_IRQ_PENDING);
len = litex_read32(priv->base + LITEETH_WRITER_LENGTH);
reg = litex_read32(reg_addr + SCRATCH_REG_OFF);
reg = litex_read32(reg_addr + SCRATCH_REG_OFF);