net: ethernet: ti: davinci_cpdma: add set rate for a channel

The cpdma has 8 rate limited tx channels. This patch adds
ability for cpdma driver to use 8 tx h/w shapers. If at least one
channel is not rate limited then it must have higher number, this
is because the rate limited channels have to have higher priority
then not rate limited channels. The channel priority is set in low-hi
direction already, so that when a new channel is added with ethtool
and it doesn't have rate yet, it cannot affect on rate limited
channels. It can be useful for TSN streams and just in cases when
h/w rate limited channels are needed.
Signed-off-by: Ivan Khoronzhuk <ivan.khoronzhuk@linaro.org>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/ethernet/ti/davinci_cpdma.h

@@ -36,6 +36,7 @@ struct cpdma_params {
 	u32			desc_hw_addr;
 	int			desc_mem_size;
 	int			desc_align;
+	u32			bus_freq_mhz;
 
 	/*
 	 * Some instances of embedded cpdma controllers have extra control and
@@ -91,8 +92,12 @@ u32 cpdma_ctrl_rxchs_state(struct cpdma_ctlr *ctlr);
 u32 cpdma_ctrl_txchs_state(struct cpdma_ctlr *ctlr);
 bool cpdma_check_free_tx_desc(struct cpdma_chan *chan);
 int cpdma_chan_set_weight(struct cpdma_chan *ch, int weight);
+int cpdma_chan_set_rate(struct cpdma_chan *ch, u32 rate);
+u32 cpdma_chan_get_rate(struct cpdma_chan *ch);
+u32 cpdma_chan_get_min_rate(struct cpdma_ctlr *ctlr);
 
 enum cpdma_control {
+	CPDMA_TX_RLIM,			/* read-write */
 	CPDMA_CMD_IDLE,			/* write-only */
 	CPDMA_COPY_ERROR_FRAMES,	/* read-write */
 	CPDMA_RX_OFF_LEN_UPDATE,	/* read-write */