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net: lantiq_xrx200: Hardcode the burst length value 

All SoCs with this IP core support 8 burst length. Hauke
suggested to hardcode this value and simplify the driver.

Link: https://lkml.org/lkml/2021/9/14/1533
Signed-off-by: Aleksander Jan Bajkowski <olek2@wp.pl>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Aleksander Jan Bajkowski 2021-10-26 22:59:01 +02:00 committed by David S. Miller
parent f8f20f2986
commit 7e553c44f0
1 changed files with 4 additions and 17 deletions
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21
drivers/net/ethernet/lantiq_xrx200.c
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@ -25,6 +25,7 @@
#define XRX200_DMA_DATA_LEN (SZ_64K - 1)
#define XRX200_DMA_RX 0
#define XRX200_DMA_TX 1
#define XRX200_DMA_BURST_LEN 8
/* cpu port mac */
#define PMAC_RX_IPG 0x0024
@ -73,9 +74,6 @@ struct xrx200_priv {
struct net_device *net_dev;
struct device *dev;
int tx_burst_len;
int rx_burst_len;
__iomem void *pmac_reg;
};
@ -323,7 +321,7 @@ static netdev_tx_t xrx200_start_xmit(struct sk_buff *skb,
goto err_drop;
/* dma needs to start on a burst length value aligned address */
byte_offset = mapping % (priv->tx_burst_len * 4);
byte_offset = mapping % (XRX200_DMA_BURST_LEN * 4);
desc->addr = mapping - byte_offset;
/* Make sure the address is written before we give it to HW */
@ -422,7 +420,8 @@ static int xrx200_dma_init(struct xrx200_priv *priv)
int ret = 0;
int i;
ltq_dma_init_port(DMA_PORT_ETOP, priv->tx_burst_len, rx_burst_len);
ltq_dma_init_port(DMA_PORT_ETOP, XRX200_DMA_BURST_LEN,
XRX200_DMA_BURST_LEN);
ch_rx->dma.nr = XRX200_DMA_RX;
ch_rx->dma.dev = priv->dev;
@ -531,18 +530,6 @@ static int xrx200_probe(struct platform_device *pdev)
if (err)
eth_hw_addr_random(net_dev);
err = device_property_read_u32(dev, "lantiq,tx-burst-length", &priv->tx_burst_len);
if (err < 0) {
dev_err(dev, "unable to read tx-burst-length property\n");
return err;
}
err = device_property_read_u32(dev, "lantiq,rx-burst-length", &priv->rx_burst_len);
if (err < 0) {
dev_err(dev, "unable to read rx-burst-length property\n");
return err;
}
/* bring up the dma engine and IP core */
err = xrx200_dma_init(priv);
if (err)