net: macb: add dma_burst_length config

GEM support higher DMA burst writes/reads than the default (4).
add configuration structure with dma burst length so it could be
applied later to DMA configuration.

Signed-off-by: Ramon Fried <rfried.dev@gmail.com>
Reviewed-by: Anup Patel <anup.patel@wdc.com>
Tested-by: Anup Patel <anup.patel@wdc.com>
Acked-by: Joe Hershberger <joe.hershberger@ni.com>

diff --git a/drivers/net/macb.c b/drivers/net/macb.c
index cf76270ad82a0e22ea7fd8828b7137139c3765ef..dc6aa6deda8347db6bdf41a4c610af8996df6472 100644 (file)
--- a/drivers/net/macb.c
+++ b/drivers/net/macb.c
@@ -82,6 +82,7 @@ struct macb_dma_desc {
 
 struct macb_device {
        void                    *regs;
+       unsigned int            dma_burst_length;
 
        unsigned int            rx_tail;
        unsigned int            tx_head;
@@ -118,6 +119,11 @@ struct macb_device {
        phy_interface_t         phy_interface;
 #endif
 };
+
+struct macb_config {
+       unsigned int            dma_burst_length;
+};
+
 #ifndef CONFIG_DM_ETH
 #define to_macb(_nd) container_of(_nd, struct macb_device, netdev)
 #endif
@@ -1135,8 +1141,13 @@ static int macb_enable_clk(struct udevice *dev)
 }
 #endif
 
+static const struct macb_config default_gem_config = {
+       .dma_burst_length = 16,
+};
+
 static int macb_eth_probe(struct udevice *dev)
 {
+       const struct macb_config *macb_config;
        struct eth_pdata *pdata = dev_get_platdata(dev);
        struct macb_device *macb = dev_get_priv(dev);
        const char *phy_mode;
@@ -1153,6 +1164,11 @@ static int macb_eth_probe(struct udevice *dev)
 
        macb->regs = (void *)pdata->iobase;
 
+       macb_config = (struct macb_config *)dev_get_driver_data(dev);
+       if (!macb_config)
+               macb_config = &default_gem_config;
+
+       macb->dma_burst_length = macb_config->dma_burst_length;
 #ifdef CONFIG_CLK
        ret = macb_enable_clk(dev);
        if (ret)
@@ -1213,12 +1229,16 @@ static int macb_eth_ofdata_to_platdata(struct udevice *dev)
        return macb_late_eth_ofdata_to_platdata(dev);
 }
 
+static const struct macb_config sama5d4_config = {
+       .dma_burst_length = 4,
+};
+
 static const struct udevice_id macb_eth_ids[] = {
        { .compatible = "cdns,macb" },
        { .compatible = "cdns,at91sam9260-macb" },
        { .compatible = "atmel,sama5d2-gem" },
        { .compatible = "atmel,sama5d3-gem" },
-       { .compatible = "atmel,sama5d4-gem" },
+       { .compatible = "atmel,sama5d4-gem", .data = (ulong)&sama5d4_config },
        { .compatible = "cdns,zynq-gem" },
        { }
 };