@@ -53,6 +53,13 @@
#define MVMDIO_XSMI_BUSY BIT(30)
#define MVMDIO_XSMI_ADDR_REG 0x8
+#define MVMDIO_XSMI_CFG_REG 0xc
+#define MVMDIO_XSMI_CLKDIV_MASK 0x3
+#define MVMDIO_XSMI_CLKDIV_256 0x0
+#define MVMDIO_XSMI_CLKDIV_64 0x1
+#define MVMDIO_XSMI_CLKDIV_32 0x2
+#define MVMDIO_XSMI_CLKDIV_8 0x3
+
/*
* SMI Timeout measurements:
* - Kirkwood 88F6281 (Globalscale Dreamplug): 45us to 95us (Interrupt)
@@ -237,6 +244,40 @@ static int orion_mdio_xsmi_write_c45(struct mii_bus *bus, int mii_id,
return 0;
}
+static void orion_mdio_xsmi_set_mdc_freq(struct mii_bus *bus)
+{
+ struct orion_mdio_dev *dev = bus->priv;
+ struct clk *mg_core;
+ u32 div, freq, cfg;
+
+ if (device_property_read_u32(bus->parent, "clock-frequency", &freq))
+ return;
+
+ mg_core = of_clk_get_by_name(bus->parent->of_node, "mg_core_clk");
+ if (IS_ERR(mg_core)) {
+ dev_err(bus->parent,
+ "MG core clock unknown, not changing MDC frequency");
+ return;
+ }
+
+ div = clk_get_rate(mg_core) / (freq + 1) + 1;
+ clk_put(mg_core);
+
+ if (div <= 8)
+ div = MVMDIO_XSMI_CLKDIV_8;
+ else if (div <= 32)
+ div = MVMDIO_XSMI_CLKDIV_32;
+ else if (div <= 64)
+ div = MVMDIO_XSMI_CLKDIV_64;
+ else
+ div = MVMDIO_XSMI_CLKDIV_256;
+
+ cfg = readl(dev->regs + MVMDIO_XSMI_CFG_REG);
+ cfg &= ~MVMDIO_XSMI_CLKDIV_MASK;
+ cfg |= div;
+ writel(cfg, dev->regs + MVMDIO_XSMI_CFG_REG);
+}
+
static irqreturn_t orion_mdio_err_irq(int irq, void *dev_id)
{
struct orion_mdio_dev *dev = dev_id;
@@ -315,6 +356,9 @@ static int orion_mdio_probe(struct platform_device *pdev)
dev_warn(&pdev->dev,
"unsupported number of clocks, limiting to the first "
__stringify(ARRAY_SIZE(dev->clk)) "\n");
+
+ if (type == BUS_TYPE_XSMI)
+ orion_mdio_xsmi_set_mdc_freq(bus);
} else {
dev->clk[0] = clk_get(&pdev->dev, NULL);
if (PTR_ERR(dev->clk[0]) == -EPROBE_DEFER) {
Support the standard "clock-frequency" attribute to set the generated MDC frequency. If not specified, the driver will leave the divisor untouched. Signed-off-by: Tobias Waldekranz <tobias@waldekranz.com> --- drivers/net/ethernet/marvell/mvmdio.c | 44 +++++++++++++++++++++++++++ 1 file changed, 44 insertions(+)