[PATCH v5 06/11] net: stmmac: dwmac-rk: Add integrated PHY support

From: David Wu
Date: Thu Aug 10 2017 - 09:55:26 EST

To make integrated PHY work, need to configure the PHY clock,
PHY cru reset and related registers.

Signed-off-by: David Wu <david.wu@xxxxxxxxxxxxxx>
---
change in v4:
- PHY is internal or not base on the phy-is-internal property via phy node.

changes in v5:
- Use phy-is-integrated property via PHY node.
- Get the PHY clock and reset control from PHY node of device tree.
- Rename internal to integrated.

drivers/net/ethernet/stmicro/stmmac/dwmac-rk.c | 99 ++++++++++++++++++++++++--
1 file changed, 95 insertions(+), 4 deletions(-)

diff --git a/drivers/net/ethernet/stmicro/stmmac/dwmac-rk.c b/drivers/net/ethernet/stmicro/stmmac/dwmac-rk.c
index a8e8fd5..9019917 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 (*integrated_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 integrated_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_phy;
+
+ struct reset_control *phy_reset;

int tx_delay;
int rx_delay;
@@ -750,9 +755,55 @@ static void rk3399_set_rmii_speed(struct rk_priv_data *bsp_priv, int speed)
.set_rmii_speed = rk3399_set_rmii_speed,
};

-static int gmac_clk_init(struct rk_priv_data *bsp_priv)
+#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_integrated_phy_powerup(struct rk_priv_data *priv)
+{
+ if (priv->ops->integrated_phy_powerup)
+ priv->ops->integrated_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->phy_reset) {
+ /* PHY needs to be disabled before trying to reset it */
+ regmap_write(priv->grf, RK_GRF_MACPHY_CON0, RK_MACPHY_DISABLE);
+ if (priv->phy_reset)
+ reset_control_assert(priv->phy_reset);
+ usleep_range(10, 20);
+ if (priv->phy_reset)
+ reset_control_deassert(priv->phy_reset);
+ usleep_range(10, 20);
+ regmap_write(priv->grf, RK_GRF_MACPHY_CON0, RK_MACPHY_ENABLE);
+ msleep(30);
+ }
+}
+
+static void rk_gmac_integrated_phy_powerdown(struct rk_priv_data *priv)
{
+ regmap_write(priv->grf, RK_GRF_MACPHY_CON0, RK_MACPHY_DISABLE);
+ if (priv->phy_reset)
+ reset_control_assert(priv->phy_reset);
+}
+
+static int rk_gmac_clk_init(struct plat_stmmacenet_data *plat)
+{
+ struct rk_priv_data *bsp_priv = plat->bsp_priv;
struct device *dev = &bsp_priv->pdev->dev;
+ int ret;

bsp_priv->clk_enabled = false;

@@ -803,6 +854,16 @@ static int gmac_clk_init(struct rk_priv_data *bsp_priv)
clk_set_rate(bsp_priv->clk_mac, 50000000);
}

+ if (plat->phy_node && bsp_priv->integrated_phy) {
+ bsp_priv->clk_phy = of_clk_get(plat->phy_node, 0);
+ if (IS_ERR(bsp_priv->clk_phy)) {
+ ret = PTR_ERR(bsp_priv->clk_phy);
+ dev_err(dev, "Cannot get PHY clock: %d\n", ret);
+ return -EINVAL;
+ }
+ clk_set_rate(bsp_priv->clk_phy, 50000000);
+ }
+
return 0;
}

@@ -826,6 +887,9 @@ static int gmac_clk_enable(struct rk_priv_data *bsp_priv, bool enable)
bsp_priv->clk_mac_refout);
}

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

@@ -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_phy))
+ clk_disable_unprepare(bsp_priv->clk_phy);
+
if (!IS_ERR(bsp_priv->aclk_mac))
clk_disable_unprepare(bsp_priv->aclk_mac);

@@ -902,6 +969,7 @@ static int phy_power_on(struct rk_priv_data *bsp_priv, bool enable)
}

static struct rk_priv_data *rk_gmac_setup(struct platform_device *pdev,
+ struct plat_stmmacenet_data *plat,
const struct rk_gmac_ops *ops)
{
struct rk_priv_data *bsp_priv;
@@ -964,9 +1032,22 @@ static struct rk_priv_data *rk_gmac_setup(struct platform_device *pdev,

bsp_priv->grf = syscon_regmap_lookup_by_phandle(dev->of_node,
"rockchip,grf");
- bsp_priv->pdev = pdev;

- gmac_clk_init(bsp_priv);
+ if (plat->phy_node) {
+ bsp_priv->integrated_phy = of_property_read_bool(plat->phy_node,
+ "phy-is-integrated");
+ if (bsp_priv->integrated_phy) {
+ bsp_priv->phy_reset = of_reset_control_get(plat->phy_node, NULL);
+ if (IS_ERR(bsp_priv->phy_reset)) {
+ dev_err(&pdev->dev, "No PHY reset control found.\n");
+ bsp_priv->phy_reset = NULL;
+ }
+ }
+ }
+ dev_info(dev, "integrated PHY? (%s).\n",
+ bsp_priv->integrated_phy ? "yes" : "no");
+
+ bsp_priv->pdev = pdev;

return bsp_priv;
}
@@ -1014,6 +1095,9 @@ static int rk_gmac_powerup(struct rk_priv_data *bsp_priv)
pm_runtime_enable(dev);
pm_runtime_get_sync(dev);

+ if (bsp_priv->integrated_phy)
+ rk_gmac_integrated_phy_powerup(bsp_priv);
+
return 0;
}

@@ -1021,6 +1105,9 @@ static void rk_gmac_powerdown(struct rk_priv_data *gmac)
{
struct device *dev = &gmac->pdev->dev;

+ if (gmac->integrated_phy)
+ rk_gmac_integrated_phy_powerdown(gmac);
+
pm_runtime_put_sync(dev);
pm_runtime_disable(dev);

@@ -1072,12 +1159,16 @@ static int rk_gmac_probe(struct platform_device *pdev)
plat_dat->has_gmac = true;
plat_dat->fix_mac_speed = rk_fix_speed;

- plat_dat->bsp_priv = rk_gmac_setup(pdev, data);
+ plat_dat->bsp_priv = rk_gmac_setup(pdev, plat_dat, data);
if (IS_ERR(plat_dat->bsp_priv)) {
ret = PTR_ERR(plat_dat->bsp_priv);
goto err_remove_config_dt;
}

+ ret = rk_gmac_clk_init(plat_dat);
+ if (ret)
+ return ret;
+
ret = rk_gmac_powerup(plat_dat->bsp_priv);
if (ret)
goto err_remove_config_dt;
--
1.9.1