[PATCH v2 6/9] net: phy: motorcomm: Add YT8531 phy support

[Yanhong Wang <yanhong.wang@starfivetech.com>]

This adds basic support for the Motorcomm YT8531
Gigabit Ethernet PHY.

Signed-off-by: Yanhong Wang <yanhong.wang@starfivetech.com>
---
 drivers/net/phy/Kconfig     |   3 +-
 drivers/net/phy/motorcomm.c | 202 ++++++++++++++++++++++++++++++++++++
 2 files changed, 204 insertions(+), 1 deletion(-)

diff --git a/drivers/net/phy/Kconfig b/drivers/net/phy/Kconfig
index c57a0262fb64..86399254d9ff 100644
--- a/drivers/net/phy/Kconfig
+++ b/drivers/net/phy/Kconfig
@@ -258,9 +258,10 @@ config MICROSEMI_PHY
 
 config MOTORCOMM_PHY
 	tristate "Motorcomm PHYs"
+	default SOC_STARFIVE
 	help
 	  Enables support for Motorcomm network PHYs.
-	  Currently supports the YT8511 gigabit PHY.
+	  Currently supports the YT8511 and YT8531 gigabit PHYs.
 
 config NATIONAL_PHY
 	tristate "National Semiconductor PHYs"
diff --git a/drivers/net/phy/motorcomm.c b/drivers/net/phy/motorcomm.c
index 7e6ac2c5e27e..bca03185b338 100644
--- a/drivers/net/phy/motorcomm.c
+++ b/drivers/net/phy/motorcomm.c
@@ -3,13 +3,17 @@
  * Driver for Motorcomm PHYs
  *
  * Author: Peter Geis <pgwipeout@gmail.com>
+ *
  */
 
+#include <linux/bitops.h>
 #include <linux/kernel.h>
 #include <linux/module.h>
+#include <linux/of.h>
 #include <linux/phy.h>
 
 #define PHY_ID_YT8511		0x0000010a
+#define PHY_ID_YT8531		0x4f51e91b
 
 #define YT8511_PAGE_SELECT	0x1e
 #define YT8511_PAGE		0x1f
@@ -17,6 +21,10 @@
 #define YT8511_EXT_DELAY_DRIVE	0x0d
 #define YT8511_EXT_SLEEP_CTRL	0x27
 
+#define YTPHY_EXT_SMI_SDS_PHY		0xa000
+#define YTPHY_EXT_CHIP_CONFIG		0xa001
+#define YTPHY_EXT_RGMII_CONFIG1	0xa003
+
 /* 2b00 25m from pll
  * 2b01 25m from xtl *default*
  * 2b10 62.m from pll
@@ -38,6 +46,51 @@
 #define YT8511_DELAY_FE_TX_EN	(0xf << 12)
 #define YT8511_DELAY_FE_TX_DIS	(0x2 << 12)
 
+struct ytphy_reg_field {
+	char *name;
+	u32 mask;
+	u8	dflt;	/* Default value */
+};
+
+struct ytphy_priv_t {
+	u32 tx_inverted_1000;
+	u32 tx_inverted_100;
+	u32 tx_inverted_10;
+};
+
+/* rx_delay_sel: RGMII rx clock delay train configuration, about 150ps per
+ *               step. Delay = 150ps * N
+ *
+ * tx_delay_sel_fe: RGMII tx clock delay train configuration when speed is
+ *                  100Mbps or 10Mbps, it's 150ps per step. Delay = 150ps * N
+ *
+ * tx_delay_sel: RGMII tx clock delay train configuration when speed is
+ *               1000Mbps, it's 150ps per step. Delay = 150ps * N
+ */
+static const struct ytphy_reg_field ytphy_rxtxd_grp[] = {
+	{ "rx_delay_sel", GENMASK(13, 10), 0x0 },
+	{ "tx_delay_sel_fe", GENMASK(7, 4), 0xf },
+	{ "tx_delay_sel", GENMASK(3, 0), 0x1 }
+};
+
+/* tx_inverted_x: Use original or inverted RGMII TX_CLK to drive the RGMII
+ *                TX_CLK delay train configuration when speed is
+ *                xMbps(10/100/1000Mbps).
+ *                0: original,  1: inverted
+ */
+static const struct ytphy_reg_field ytphy_txinver_grp[] = {
+	{ "tx_inverted_1000", BIT(14), 0x0 },
+	{ "tx_inverted_100", BIT(14), 0x0 },
+	{ "tx_inverted_10", BIT(14), 0x0 }
+};
+
+/* rxc_dly_en: RGMII clk 2ns delay control bit.
+ *             0: disable   1: enable
+ */
+static const struct ytphy_reg_field ytphy_rxden_grp[] = {
+	{ "rxc_dly_en", BIT(8), 0x1 }
+};
+
 static int yt8511_read_page(struct phy_device *phydev)
 {
 	return __phy_read(phydev, YT8511_PAGE_SELECT);
@@ -48,6 +101,33 @@ static int yt8511_write_page(struct phy_device *phydev, int page)
 	return __phy_write(phydev, YT8511_PAGE_SELECT, page);
 };
 
+static int ytphy_read_ext(struct phy_device *phydev, u32 regnum)
+{
+	int ret;
+	int val;
+
+	ret = __phy_write(phydev, YT8511_PAGE_SELECT, regnum);
+	if (ret < 0)
+		return ret;
+
+	val = __phy_read(phydev, YT8511_PAGE);
+
+	return val;
+}
+
+static int ytphy_write_ext(struct phy_device *phydev, u32 regnum, u16 val)
+{
+	int ret;
+
+	ret = __phy_write(phydev, YT8511_PAGE_SELECT, regnum);
+	if (ret < 0)
+		return ret;
+
+	ret = __phy_write(phydev, YT8511_PAGE, val);
+
+	return ret;
+}
+
 static int yt8511_config_init(struct phy_device *phydev)
 {
 	int oldpage, ret = 0;
@@ -111,6 +191,116 @@ static int yt8511_config_init(struct phy_device *phydev)
 	return phy_restore_page(phydev, oldpage, ret);
 }
 
+static int ytphy_config_init(struct phy_device *phydev)
+{
+	struct device_node *of_node;
+	u32 val;
+	u32 mask;
+	u32 cfg;
+	int ret;
+	int i = 0;
+
+	of_node = phydev->mdio.dev.of_node;
+	if (of_node) {
+		ret = of_property_read_u32(of_node, ytphy_rxden_grp[0].name, &cfg);
+		if (!ret) {
+			mask = ytphy_rxden_grp[0].mask;
+			val = ytphy_read_ext(phydev, YTPHY_EXT_CHIP_CONFIG);
+
+			/* check the cfg overflow or not */
+			cfg = cfg > mask >> (ffs(mask) - 1) ? mask : cfg;
+
+			val &= ~mask;
+			val |= FIELD_PREP(mask, cfg);
+			ytphy_write_ext(phydev, YTPHY_EXT_CHIP_CONFIG, val);
+		}
+
+		val = ytphy_read_ext(phydev, YTPHY_EXT_RGMII_CONFIG1);
+		for (i = 0; i < ARRAY_SIZE(ytphy_rxtxd_grp); i++) {
+			ret = of_property_read_u32(of_node, ytphy_rxtxd_grp[i].name, &cfg);
+			if (!ret) {
+				mask = ytphy_rxtxd_grp[i].mask;
+
+				/* check the cfg overflow or not */
+				cfg = cfg > mask >> (ffs(mask) - 1) ? mask : cfg;
+
+				val &= ~mask;
+				val |= cfg << (ffs(mask) - 1);
+			}
+		}
+		return ytphy_write_ext(phydev, YTPHY_EXT_RGMII_CONFIG1, val);
+	}
+
+	phydev_err(phydev, "Get of node fail\n");
+
+	return -EINVAL;
+}
+
+static void ytphy_link_change_notify(struct phy_device *phydev)
+{
+	u32 val;
+	struct ytphy_priv_t *ytphy_priv = phydev->priv;
+
+	if (phydev->speed < 0)
+		return;
+
+	val = ytphy_read_ext(phydev, YTPHY_EXT_RGMII_CONFIG1);
+	switch (phydev->speed) {
+	case SPEED_1000:
+		val  &= ~ytphy_txinver_grp[0].mask;
+		val |= FIELD_PREP(ytphy_txinver_grp[0].mask,
+				ytphy_priv->tx_inverted_1000);
+		break;
+
+	case SPEED_100:
+		val  &= ~ytphy_txinver_grp[1].mask;
+		val |= FIELD_PREP(ytphy_txinver_grp[1].mask,
+				ytphy_priv->tx_inverted_100);
+		break;
+
+	case SPEED_10:
+		val  &= ~ytphy_txinver_grp[2].mask;
+		val |= FIELD_PREP(ytphy_txinver_grp[2].mask,
+				ytphy_priv->tx_inverted_10);
+		break;
+
+	default:
+		break;
+	}
+
+	ytphy_write_ext(phydev, YTPHY_EXT_RGMII_CONFIG1, val);
+}
+
+static int yt8531_probe(struct phy_device *phydev)
+{
+	struct ytphy_priv_t *priv;
+	const struct device_node *of_node;
+	u32 val;
+	int ret;
+
+	priv = devm_kzalloc(&phydev->mdio.dev, sizeof(*priv), GFP_KERNEL);
+	if (!priv)
+		return -ENOMEM;
+
+	of_node = phydev->mdio.dev.of_node;
+	if (of_node) {
+		ret = of_property_read_u32(of_node, ytphy_txinver_grp[0].name, &val);
+		if (!ret)
+			priv->tx_inverted_1000 = val;
+
+		ret = of_property_read_u32(of_node, ytphy_txinver_grp[1].name, &val);
+		if (!ret)
+			priv->tx_inverted_100 = val;
+
+		ret = of_property_read_u32(of_node, ytphy_txinver_grp[2].name, &val);
+		if (!ret)
+			priv->tx_inverted_10 = val;
+	}
+	phydev->priv = priv;
+
+	return 0;
+}
+
 static struct phy_driver motorcomm_phy_drvs[] = {
 	{
 		PHY_ID_MATCH_EXACT(PHY_ID_YT8511),
@@ -120,6 +310,17 @@ static struct phy_driver motorcomm_phy_drvs[] = {
 		.resume		= genphy_resume,
 		.read_page	= yt8511_read_page,
 		.write_page	= yt8511_write_page,
+	}, {
+		PHY_ID_MATCH_EXACT(PHY_ID_YT8531),
+		.name		= "YT8531 Gigabit Ethernet",
+		.probe		= yt8531_probe,
+		.config_init	= ytphy_config_init,
+		.read_status	= genphy_read_status,
+		.suspend	= genphy_suspend,
+		.resume		= genphy_resume,
+		.read_page	= yt8511_read_page,
+		.write_page	= yt8511_write_page,
+		.link_change_notify = ytphy_link_change_notify,
 	},
 };
 
@@ -131,6 +332,7 @@ MODULE_LICENSE("GPL");
 
 static const struct mdio_device_id __maybe_unused motorcomm_tbl[] = {
 	{ PHY_ID_MATCH_EXACT(PHY_ID_YT8511) },
+	{ PHY_ID_MATCH_EXACT(PHY_ID_YT8531) },
 	{ /* sentinal */ }
 };
 
-- 
2.17.1