CHSTAT
channel, CHSTAT, 1);
1, 1024, false, channel, CHSTAT, 1);
chstat = rz_dmac_ch_readl(channel, CHSTAT, 1);
u32 val = rz_dmac_ch_readl(channel, CHSTAT, 1);
u32 val = rz_dmac_ch_readl(channel, CHSTAT, 1);
100, 100000, false, channel, CHSTAT, 1);