The Meson GXL dwmac Glue Layer also provides switching between an external PHY
and an internal RMII 10/100 PHY.
Add a way to setup the correct PHY switching from a device tree attribute.
Currently, the register format is unknown and this is a temporary workaround
until a clarification on the registers fields is received from Amlogic.
Signed-off-by: Neil Armstrong <narmstrong@xxxxxxxxxxxx>
---
.../net/ethernet/stmicro/stmmac/dwmac-meson8b.c | 25 ++++++++++++++++++++++
1 file changed, 25 insertions(+)
diff --git a/drivers/net/ethernet/stmicro/stmmac/dwmac-meson8b.c b/drivers/net/ethernet/stmicro/stmmac/dwmac-meson8b.c
index 250e4ce..875cd7c 100644
--- a/drivers/net/ethernet/stmicro/stmmac/dwmac-meson8b.c
+++ b/drivers/net/ethernet/stmicro/stmmac/dwmac-meson8b.c
@@ -53,10 +53,15 @@
#define MUX_CLK_NUM_PARENTS 2
+#define PHYSEL_REG0 0x0
+#define PHYSEL_REG0_VALUE 0x10110181
+#define PHYSEL_REG1 0x4
+
struct meson8b_dwmac {
struct platform_device *pdev;
void __iomem *regs;
+ void __iomem *physel_regs;
phy_interface_t phy_mode;
@@ -244,6 +249,23 @@ static int meson8b_init_prg_eth(struct meson8b_dwmac *dwmac)
meson8b_dwmac_mask_bits(dwmac, PRG_ETH0, PRG_ETH0_TX_AND_PHY_REF_CLK,
PRG_ETH0_TX_AND_PHY_REF_CLK);
+ /* Select PHY, either internal or external if specified */
+ if (!IS_ERR(dwmac->physel_regs) &&
+ of_find_property(dwmac->pdev->dev.of_node,
+ "amlogic,phy-select", NULL)) {
+ u32 val;
+
+ ret = of_property_read_u32(dwmac->pdev->dev.of_node,
+ "amlogic,phy-select", &val);
+ if (ret) {
+ dev_err(&dwmac->pdev->dev, "invalid phy-select property\n");
+ } else {
+ writel(PHYSEL_REG0_VALUE,
+ dwmac->physel_regs + PHYSEL_REG0);
+ writel(val, dwmac->physel_regs + PHYSEL_REG1);
+ }
+ }
+
return 0;
}
@@ -272,6 +294,9 @@ static int meson8b_dwmac_probe(struct platform_device *pdev)
if (IS_ERR(dwmac->regs))
return PTR_ERR(dwmac->regs);
+ res = platform_get_resource(pdev, IORESOURCE_MEM, 2);
+ dwmac->physel_regs = devm_ioremap_resource(&pdev->dev, res);
+
dwmac->pdev = pdev;
dwmac->phy_mode = of_get_phy_mode(pdev->dev.of_node);
if (dwmac->phy_mode < 0) {
--
1.9.1
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