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ath79: ag71xx: Rework mdio clock settings

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Allow specifying desired mdio clock frequency in dts.
Use default frequency around 5MHz for builtin switch and 2MHz for other mdio bus.

Signed-off-by: Chuanhong Guo <gch981213@gmail.com>
This commit is contained in:
Chuanhong Guo
2018-07-17 17:09:14 +08:00
committed by John Crispin
parent bb7fac4369
commit 85189e4c00
2 changed files with 63 additions and 26 deletions
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1
target/linux/ath79/dts/ar9330.dtsi
View File

@@ -166,6 +166,7 @@
&mdio1 {
status = "okay";
compatible = "qca,ar9330-mdio";
resets = <&rst 23>;
reset-names = "mdio";

78
target/linux/ath79/files/drivers/net/ethernet/atheros/ag71xx/ag71xx_mdio.c
View File

@@ -84,14 +84,62 @@ static int ag71xx_mdio_mii_write(struct mii_bus *bus, int addr, int reg, u16 val
return 0;
}
static int ar934x_mdio_clock_div(unsigned int rate)
static const u32 ar71xx_mdio_div_table[] = {
4, 4, 6, 8, 10, 14, 20, 28,
};
static const u32 ar7240_mdio_div_table[] = {
2, 2, 4, 6, 8, 12, 18, 26, 32, 40, 48, 56, 62, 70, 78, 96,
};
static const u32 ar933x_mdio_div_table[] = {
4, 4, 6, 8, 10, 14, 20, 28, 34, 42, 50, 58, 66, 74, 82, 98,
};
static int ag71xx_mdio_get_divider(struct device_node *np, u32 *div)
{
if (rate == 100 * 1000 * 1000)
return 6; /* 100 MHz clock divided by 20 => 5 MHz */
else if (rate == 25 * 1000 * 1000)
return 0; /* 25 MHz clock divided by 4 => 6.25 MHz */
struct clk *ref_clk = of_clk_get(np, 0);
unsigned long ref_clock;
u32 mdio_clock;
const u32 *table;
int ndivs, i;
if (IS_ERR(ref_clk))
return -EINVAL;
ref_clock = clk_get_rate(ref_clk);
clk_put(ref_clk);
if(of_property_read_u32(np, "qca,mdio-max-frequency", &mdio_clock)) {
if (of_property_read_bool(np, "builtin-switch"))
mdio_clock = 5000000;
else
return 3; /* 40 MHz clock divided by 8 => 5 MHz */
mdio_clock = 2000000;
}
if (of_device_is_compatible(np, "qca,ar9330-mdio") ||
of_device_is_compatible(np, "qca,ar9340-mdio")) {
table = ar933x_mdio_div_table;
ndivs = ARRAY_SIZE(ar933x_mdio_div_table);
} else if (of_device_is_compatible(np, "qca,ar7240-mdio")) {
table = ar7240_mdio_div_table;
ndivs = ARRAY_SIZE(ar7240_mdio_div_table);
} else {
table = ar71xx_mdio_div_table;
ndivs = ARRAY_SIZE(ar71xx_mdio_div_table);
}
for (i = 0; i < ndivs; i++) {
unsigned long t;
t = ref_clock / table[i];
if (t <= mdio_clock) {
*div = i;
return 0;
}
}
return -ENOENT;
}
static int ag71xx_mdio_reset(struct mii_bus *bus)
@@ -103,26 +151,13 @@ static int ag71xx_mdio_reset(struct mii_bus *bus)
builtin_switch = of_property_read_bool(np, "builtin-switch");
if (of_device_is_compatible(np, "qca,ar7240-mdio"))
t = MII_CFG_CLK_DIV_6;
else if (of_device_is_compatible(np, "qca,ar9340-mdio"))
if (ag71xx_mdio_get_divider(np, &t)) {
if (of_device_is_compatible(np, "qca,ar9340-mdio"))
t = MII_CFG_CLK_DIV_58;
else if (builtin_switch)
t = MII_CFG_CLK_DIV_10;
else
t = MII_CFG_CLK_DIV_28;
if (builtin_switch && of_device_is_compatible(np, "qca,ar9340-mdio")) {
struct clk *ref_clk = of_clk_get(np, 0);
int clock_rate;
if (WARN_ON_ONCE(!ref_clk))
clock_rate = 40 * 1000 * 1000;
else
clock_rate = clk_get_rate(ref_clk);
t = ar934x_mdio_clock_div(clock_rate);
clk_put(ref_clk);
}
regmap_write(am->mii_regmap, AG71XX_REG_MII_CFG, t | MII_CFG_RESET);
@@ -200,6 +235,7 @@ static int ag71xx_mdio_remove(struct platform_device *pdev)
static const struct of_device_id ag71xx_mdio_match[] = {
{ .compatible = "qca,ar7240-mdio" },
{ .compatible = "qca,ar9330-mdio" },
{ .compatible = "qca,ar9340-mdio" },
{ .compatible = "qca,ath79-mdio" },
{}