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Subject[PATCH v2 05/11] net: stmmac: dwmac-rk: Add internal phy support
Date
To make internal phy work, need to configure the phy_clock,
phy cru_reset and related registers.

Signed-off-by: David Wu <david.wu@rock-chips.com>
---
changes in v2:
- Use the standard "phy-mode" property for internal phy. (Florian)
- Move the internal macphy clock to the optional properties. (Heiko)

.../devicetree/bindings/net/rockchip-dwmac.txt | 4 +-
drivers/net/ethernet/stmicro/stmmac/dwmac-rk.c | 94 +++++++++++++++++++++-
2 files changed, 93 insertions(+), 5 deletions(-)

diff --git a/Documentation/devicetree/bindings/net/rockchip-dwmac.txt b/Documentation/devicetree/bindings/net/rockchip-dwmac.txt
index 8f42755..ecebab8 100644
--- a/Documentation/devicetree/bindings/net/rockchip-dwmac.txt
+++ b/Documentation/devicetree/bindings/net/rockchip-dwmac.txt
@@ -25,7 +25,8 @@ Required properties:
- clock-names: One name for each entry in the clocks property.
- phy-mode: See ethernet.txt file in the same directory.
- pinctrl-names: Names corresponding to the numbered pinctrl states.
- - pinctrl-0: pin-control mode. can be <&rgmii_pins> or <&rmii_pins>.
+ - pinctrl-0: pin-control mode. can be <&rgmii_pins>, <&rmii_pins> or led pins
+ for internal phy mode.
- clock_in_out: For RGMII, it must be "input", means main clock(125MHz)
is not sourced from SoC's PLL, but input from PHY; For RMII, "input" means
PHY provides the reference clock(50MHz), "output" means GMAC provides the
@@ -40,6 +41,7 @@ Optional properties:
- tx_delay: Delay value for TXD timing. Range value is 0~0x7F, 0x30 as default.
- rx_delay: Delay value for RXD timing. Range value is 0~0x7F, 0x10 as default.
- phy-supply: phandle to a regulator if the PHY needs one
+ - clocks: <&cru MAC_PHY>: clock for internal macphy

Example:

diff --git a/drivers/net/ethernet/stmicro/stmmac/dwmac-rk.c b/drivers/net/ethernet/stmicro/stmmac/dwmac-rk.c
index a8e8fd5..ec280d1 100644
--- a/drivers/net/ethernet/stmicro/stmmac/dwmac-rk.c
+++ b/drivers/net/ethernet/stmicro/stmmac/dwmac-rk.c
@@ -41,6 +41,7 @@ struct rk_gmac_ops {
void (*set_to_rmii)(struct rk_priv_data *bsp_priv);
void (*set_rgmii_speed)(struct rk_priv_data *bsp_priv, int speed);
void (*set_rmii_speed)(struct rk_priv_data *bsp_priv, int speed);
+ void (*internal_phy_powerup)(struct rk_priv_data *bsp_priv);
};

struct rk_priv_data {
@@ -52,6 +53,7 @@ struct rk_priv_data {

bool clk_enabled;
bool clock_input;
+ bool internal_phy;

struct clk *clk_mac;
struct clk *gmac_clkin;
@@ -61,6 +63,9 @@ struct rk_priv_data {
struct clk *clk_mac_refout;
struct clk *aclk_mac;
struct clk *pclk_mac;
+ struct clk *clk_macphy;
+
+ struct reset_control *macphy_reset;

int tx_delay;
int rx_delay;
@@ -750,6 +755,50 @@ static void rk3399_set_rmii_speed(struct rk_priv_data *bsp_priv, int speed)
.set_rmii_speed = rk3399_set_rmii_speed,
};

+#define RK_GRF_MACPHY_CON0 0xb00
+#define RK_GRF_MACPHY_CON1 0xb04
+#define RK_GRF_MACPHY_CON2 0xb08
+#define RK_GRF_MACPHY_CON3 0xb0c
+
+#define RK_MACPHY_ENABLE GRF_BIT(0)
+#define RK_MACPHY_DISABLE GRF_CLR_BIT(0)
+#define RK_MACPHY_CFG_CLK_50M GRF_BIT(14)
+#define RK_GMAC2PHY_RMII_MODE (GRF_BIT(6) | GRF_CLR_BIT(7))
+#define RK_GRF_CON2_MACPHY_ID HIWORD_UPDATE(0x1234, 0xffff, 0)
+#define RK_GRF_CON3_MACPHY_ID HIWORD_UPDATE(0x35, 0x3f, 0)
+
+static void rk_gmac_internal_phy_powerup(struct rk_priv_data *priv)
+{
+ if (priv->ops->internal_phy_powerup)
+ priv->ops->internal_phy_powerup(priv);
+
+ regmap_write(priv->grf, RK_GRF_MACPHY_CON0, RK_MACPHY_CFG_CLK_50M);
+ regmap_write(priv->grf, RK_GRF_MACPHY_CON0, RK_GMAC2PHY_RMII_MODE);
+
+ regmap_write(priv->grf, RK_GRF_MACPHY_CON2, RK_GRF_CON2_MACPHY_ID);
+ regmap_write(priv->grf, RK_GRF_MACPHY_CON3, RK_GRF_CON3_MACPHY_ID);
+
+ if (priv->macphy_reset) {
+ /* macphy needs to be disabled before trying to reset it */
+ regmap_write(priv->grf, RK_GRF_MACPHY_CON0, RK_MACPHY_DISABLE);
+ if (priv->macphy_reset)
+ reset_control_assert(priv->macphy_reset);
+ usleep_range(10, 20);
+ if (priv->macphy_reset)
+ reset_control_deassert(priv->macphy_reset);
+ usleep_range(10, 20);
+ regmap_write(priv->grf, RK_GRF_MACPHY_CON0, RK_MACPHY_ENABLE);
+ msleep(30);
+ }
+}
+
+static void rk_gmac_internal_phy_powerdown(struct rk_priv_data *priv)
+{
+ regmap_write(priv->grf, RK_GRF_MACPHY_CON0, RK_MACPHY_DISABLE);
+ if (priv->macphy_reset)
+ reset_control_assert(priv->macphy_reset);
+}
+
static int gmac_clk_init(struct rk_priv_data *bsp_priv)
{
struct device *dev = &bsp_priv->pdev->dev;
@@ -781,7 +830,8 @@ static int gmac_clk_init(struct rk_priv_data *bsp_priv)
dev_err(dev, "cannot get clock %s\n",
"stmmaceth");

- if (bsp_priv->phy_iface == PHY_INTERFACE_MODE_RMII) {
+ if (bsp_priv->phy_iface == PHY_INTERFACE_MODE_RMII ||
+ bsp_priv->phy_iface == PHY_INTERFACE_MODE_INTERNAL) {
bsp_priv->clk_mac_ref = devm_clk_get(dev, "clk_mac_ref");
if (IS_ERR(bsp_priv->clk_mac_ref))
dev_err(dev, "cannot get clock %s\n",
@@ -799,10 +849,19 @@ static int gmac_clk_init(struct rk_priv_data *bsp_priv)
if (bsp_priv->clock_input) {
dev_info(dev, "clock input from PHY\n");
} else {
- if (bsp_priv->phy_iface == PHY_INTERFACE_MODE_RMII)
+ if (bsp_priv->phy_iface == PHY_INTERFACE_MODE_RMII ||
+ bsp_priv->phy_iface == PHY_INTERFACE_MODE_INTERNAL)
clk_set_rate(bsp_priv->clk_mac, 50000000);
}

+ if (bsp_priv->internal_phy) {
+ bsp_priv->clk_macphy = devm_clk_get(dev, "clk_macphy");
+ if (IS_ERR(bsp_priv->clk_macphy))
+ dev_err(dev, "cannot get %s clock\n", "clk_macphy");
+ else
+ clk_set_rate(bsp_priv->clk_macphy, 50000000);
+ }
+
return 0;
}

@@ -812,7 +871,8 @@ static int gmac_clk_enable(struct rk_priv_data *bsp_priv, bool enable)

if (enable) {
if (!bsp_priv->clk_enabled) {
- if (phy_iface == PHY_INTERFACE_MODE_RMII) {
+ if (phy_iface == PHY_INTERFACE_MODE_RMII ||
+ phy_iface == PHY_INTERFACE_MODE_INTERNAL) {
if (!IS_ERR(bsp_priv->mac_clk_rx))
clk_prepare_enable(
bsp_priv->mac_clk_rx);
@@ -826,6 +886,9 @@ static int gmac_clk_enable(struct rk_priv_data *bsp_priv, bool enable)
bsp_priv->clk_mac_refout);
}

+ if (!IS_ERR(bsp_priv->clk_macphy))
+ clk_prepare_enable(bsp_priv->clk_macphy);
+
if (!IS_ERR(bsp_priv->aclk_mac))
clk_prepare_enable(bsp_priv->aclk_mac);

@@ -844,7 +907,8 @@ static int gmac_clk_enable(struct rk_priv_data *bsp_priv, bool enable)
}
} else {
if (bsp_priv->clk_enabled) {
- if (phy_iface == PHY_INTERFACE_MODE_RMII) {
+ if (phy_iface == PHY_INTERFACE_MODE_RMII ||
+ phy_iface == PHY_INTERFACE_MODE_INTERNAL) {
if (!IS_ERR(bsp_priv->mac_clk_rx))
clk_disable_unprepare(
bsp_priv->mac_clk_rx);
@@ -858,6 +922,9 @@ static int gmac_clk_enable(struct rk_priv_data *bsp_priv, bool enable)
bsp_priv->clk_mac_refout);
}

+ if (!IS_ERR(bsp_priv->clk_macphy))
+ clk_disable_unprepare(bsp_priv->clk_macphy);
+
if (!IS_ERR(bsp_priv->aclk_mac))
clk_disable_unprepare(bsp_priv->aclk_mac);

@@ -940,6 +1007,17 @@ static struct rk_priv_data *rk_gmac_setup(struct platform_device *pdev,
bsp_priv->clock_input = false;
}

+ if (bsp_priv->phy_iface == PHY_INTERFACE_MODE_INTERNAL) {
+ bsp_priv->internal_phy = true;
+ bsp_priv->macphy_reset = devm_reset_control_get(dev, "mac-phy");
+ if (IS_ERR(bsp_priv->macphy_reset)) {
+ dev_info(dev, "no macphy_reset control found\n");
+ bsp_priv->macphy_reset = NULL;
+ }
+ }
+ dev_info(dev, "internal PHY? (%s).\n",
+ bsp_priv->internal_phy ? "yes" : "no");
+
ret = of_property_read_u32(dev->of_node, "tx_delay", &value);
if (ret) {
bsp_priv->tx_delay = 0x30;
@@ -1000,6 +1078,7 @@ static int rk_gmac_powerup(struct rk_priv_data *bsp_priv)
bsp_priv->ops->set_to_rgmii(bsp_priv, 0, bsp_priv->rx_delay);
break;
case PHY_INTERFACE_MODE_RMII:
+ case PHY_INTERFACE_MODE_INTERNAL:
dev_info(dev, "init for RMII\n");
bsp_priv->ops->set_to_rmii(bsp_priv);
break;
@@ -1014,6 +1093,9 @@ static int rk_gmac_powerup(struct rk_priv_data *bsp_priv)
pm_runtime_enable(dev);
pm_runtime_get_sync(dev);

+ if (bsp_priv->internal_phy)
+ rk_gmac_internal_phy_powerup(bsp_priv);
+
return 0;
}

@@ -1021,6 +1103,9 @@ static void rk_gmac_powerdown(struct rk_priv_data *gmac)
{
struct device *dev = &gmac->pdev->dev;

+ if (gmac->internal_phy)
+ rk_gmac_internal_phy_powerdown(gmac);
+
pm_runtime_put_sync(dev);
pm_runtime_disable(dev);

@@ -1041,6 +1126,7 @@ static void rk_fix_speed(void *priv, unsigned int speed)
bsp_priv->ops->set_rgmii_speed(bsp_priv, speed);
break;
case PHY_INTERFACE_MODE_RMII:
+ case PHY_INTERFACE_MODE_INTERNAL:
bsp_priv->ops->set_rmii_speed(bsp_priv, speed);
break;
default:
--
1.9.1

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