[PATCH v5 7/8] drivers: net: macb: add fu740 support
Green Wan
green.wan at sifive.com
Thu Apr 8 12:26:55 CEST 2021
From: David Abdurachmanov <david.abdurachmanov at sifive.com>
Add fu740 support to macb ethernet driver
There is a PLL HW quirk in FU740. The VSC8541XMV-02 specification
requires 125 +/-0.0125 Mhz. But the most close value can be output
by PLL is 125.125 MHz and out of VSC8541XMV-02 spec.
Signed-off-by: David Abdurachmanov <david.abdurachmanov at sifive.com>
Signed-off-by: Green Wan <green.wan at sifive.com>
Reviewed-by: Ramon Fried <rfried.dev at gmail.com>
Reviewed-by: Bin Meng <bmeng.cn at gmail.com>
---
drivers/net/macb.c | 13 ++++++++++++-
1 file changed, 12 insertions(+), 1 deletion(-)
diff --git a/drivers/net/macb.c b/drivers/net/macb.c
index 57ea45e2dc..bf70525c54 100644
--- a/drivers/net/macb.c
+++ b/drivers/net/macb.c
@@ -591,8 +591,17 @@ static int macb_sifive_clk_init(struct udevice *dev, ulong rate)
* 0 = GMII mode. Use 125 MHz gemgxlclk from PRCI in TX logic
* and output clock on GMII output signal GTX_CLK
* 1 = MII mode. Use MII input signal TX_CLK in TX logic
+ *
+ * FU740 have a PLL HW quirk. The 125.125 Mhz is actually out of
+ * VSC8541XMV-02 specification. The tolerance level is +/-100ppm.
+ * Which means the range should be in between 125MHz +/-0.0125.
+ * But the most close value can be output by PLL is 125.125 MHz.
*/
- writel(rate != 125000000, gemgxl_regs);
+ if (device_is_compatible(dev, "sifive,fu540-c000-gem"))
+ writel(rate != 125000000, gemgxl_regs);
+ else if (device_is_compatible(dev, "sifive,fu740-c000-gem"))
+ writel(rate != 125125000, gemgxl_regs);
+
return 0;
}
@@ -1507,6 +1516,8 @@ static const struct udevice_id macb_eth_ids[] = {
{ .compatible = "cdns,zynq-gem" },
{ .compatible = "sifive,fu540-c000-gem",
.data = (ulong)&sifive_config },
+ { .compatible = "sifive,fu740-c000-gem",
+ .data = (ulong)&sifive_config },
{ .compatible = "microchip,mpfs-mss-gem",
.data = (ulong)µchip_config },
{ }
--
2.31.0
More information about the U-Boot
mailing list