RFCR
writel(i*2, dev->base + RFCR);
u8 __iomem *rfcr = dev->base + RFCR;
writel(0, dev->base + RFCR);
writel(0x7fc00000, dev->base + RFCR);
writel(0xffc00000, dev->base + RFCR);
[RFCR] = 0x0760,
[RFCR] = 0x03f4,
add_reg(RFCR);
[RFCR] = 0x01f4,
[RFCR] = 0x01a4,
i2s_write_reg(dev->i2s_base, RFCR(ch_reg),
kmb_i2s->i2s_base + RFCR(ch_reg));