Message-ID: <a21288bf80f26dda6c9729edb5b25d0995df5e38.1691724757.git.daniel@makrotopia.org>
Date:   Fri, 11 Aug 2023 04:35:38 +0100
From:   Daniel Golle <daniel@...rotopia.org>
To:     Daniel Golle <daniel@...rotopia.org>,
        Qingfang Deng <dqfext@...il.com>,
        SkyLake Huang <SkyLake.Huang@...iatek.com>,
        Andrew Lunn <andrew@...n.ch>,
        Heiner Kallweit <hkallweit1@...il.com>,
        Russell King <linux@...linux.org.uk>,
        "David S. Miller" <davem@...emloft.net>,
        Eric Dumazet <edumazet@...gle.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>,
        Matthias Brugger <matthias.bgg@...il.com>,
        AngeloGioacchino Del Regno 
        <angelogioacchino.delregno@...labora.com>, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-mediatek@...ts.infradead.org
Subject: [PATCH net-next] net: phy: mediatek-ge-soc: support PHY LEDs

Implement netdev trigger and primitive bliking offloading as well as
simple set_brigthness function for both PHY LEDs of the in-SoC PHYs
found in MT7981 and MT7988.

On MT7988 it is necessary to read the boottrap register and apply LED
polarities accordingly to get uniform behavior from all LEDs.

Signed-off-by: Daniel Golle <daniel@...rotopia.org>
---
 drivers/net/phy/mediatek-ge-soc.c | 433 +++++++++++++++++++++++++++++-
 1 file changed, 424 insertions(+), 9 deletions(-)

diff --git a/drivers/net/phy/mediatek-ge-soc.c b/drivers/net/phy/mediatek-ge-soc.c
index da512fab0eb0b..76c146987ef24 100644
--- a/drivers/net/phy/mediatek-ge-soc.c
+++ b/drivers/net/phy/mediatek-ge-soc.c
@@ -1,9 +1,12 @@
 // SPDX-License-Identifier: GPL-2.0+
 #include <linux/bitfield.h>
+#include <linux/bitmap.h>
+#include <linux/mfd/syscon.h>
 #include <linux/module.h>
 #include <linux/nvmem-consumer.h>
 #include <linux/pinctrl/consumer.h>
 #include <linux/phy.h>
+#include <linux/regmap.h>
 
 #define MTK_GPHY_ID_MT7981			0x03a29461
 #define MTK_GPHY_ID_MT7988			0x03a29481
@@ -206,9 +209,42 @@
 #define MTK_PHY_DA_TX_R50_PAIR_C		0x53f
 #define MTK_PHY_DA_TX_R50_PAIR_D		0x540
 
+/* Registers on MDIO_MMD_VEND2 */
+#define MTK_PHY_LED0_ON_CTRL			0x24
+#define MTK_PHY_LED1_ON_CTRL			0x26
+#define   MTK_PHY_LED_ON_MASK			GENMASK(6, 0)
+#define   MTK_PHY_LED_ON_LINK1000		BIT(0)
+#define   MTK_PHY_LED_ON_LINK100		BIT(1)
+#define   MTK_PHY_LED_ON_LINK10			BIT(2)
+#define   MTK_PHY_LED_ON_LINKDOWN		BIT(3)
+#define   MTK_PHY_LED_ON_FDX			BIT(4) /* Full duplex */
+#define   MTK_PHY_LED_ON_HDX			BIT(5) /* Half duplex */
+#define   MTK_PHY_LED_ON_FORCE_ON		BIT(6)
+#define   MTK_PHY_LED_ON_POLARITY		BIT(14)
+#define   MTK_PHY_LED_ON_ENABLE			BIT(15)
+
+#define MTK_PHY_LED0_BLINK_CTRL			0x25
+#define MTK_PHY_LED1_BLINK_CTRL			0x27
+#define   MTK_PHY_LED_BLINK_1000TX		BIT(0)
+#define   MTK_PHY_LED_BLINK_1000RX		BIT(1)
+#define   MTK_PHY_LED_BLINK_100TX		BIT(2)
+#define   MTK_PHY_LED_BLINK_100RX		BIT(3)
+#define   MTK_PHY_LED_BLINK_10TX		BIT(4)
+#define   MTK_PHY_LED_BLINK_10RX		BIT(5)
+#define   MTK_PHY_LED_BLINK_COLLISION		BIT(6)
+#define   MTK_PHY_LED_BLINK_RX_CRC_ERR		BIT(7)
+#define   MTK_PHY_LED_BLINK_RX_IDLE_ERR		BIT(8)
+#define   MTK_PHY_LED_BLINK_FORCE_BLINK		BIT(9)
+
+#define MTK_PHY_LED1_DEFAULT_POLARITIES		BIT(1)
+
 #define MTK_PHY_RG_BG_RASEL			0x115
 #define   MTK_PHY_RG_BG_RASEL_MASK		GENMASK(2, 0)
 
+/* Register in boottrap syscon defining the initial state of the 4 PHY LEDs */
+#define RG_GPIO_MISC_TPBANK0			0x6f0
+#define   RG_GPIO_MISC_TPBANK0_BOOTMODE		GENMASK(11, 8)
+
 /* These macro privides efuse parsing for internal phy. */
 #define EFS_DA_TX_I2MPB_A(x)			(((x) >> 0) & GENMASK(5, 0))
 #define EFS_DA_TX_I2MPB_B(x)			(((x) >> 6) & GENMASK(5, 0))
@@ -236,13 +272,6 @@ enum {
 	PAIR_D,
 };
 
-enum {
-	GPHY_PORT0,
-	GPHY_PORT1,
-	GPHY_PORT2,
-	GPHY_PORT3,
-};
-
 enum calibration_mode {
 	EFUSE_K,
 	SW_K
@@ -261,6 +290,18 @@ enum CAL_MODE {
 	SW_M
 };
 
+#define MTK_PHY_LED_STATE_FORCE_ON	BIT(0)
+#define MTK_PHY_LED_STATE_FORCE_BLINK	BIT(1)
+#define MTK_PHY_LED_STATE_NETDEV	BIT(2)
+struct mtk_socphy_priv {
+	unsigned long		led_state;
+};
+
+struct mtk_socphy_shared {
+	u32			boottrap;
+	struct mtk_socphy_priv	priv[4];
+};
+
 static int mtk_socphy_read_page(struct phy_device *phydev)
 {
 	return __phy_read(phydev, MTK_EXT_PAGE_ACCESS);
@@ -1071,6 +1112,370 @@ static int mt798x_phy_config_init(struct phy_device *phydev)
 	return mt798x_phy_calibration(phydev);
 }
 
+static int mt798x_phy_hw_led_on_set(struct phy_device *phydev, u8 index,
+				    bool on)
+{
+	struct mtk_socphy_priv *priv = phydev->priv;
+	u32 mask = MTK_PHY_LED_STATE_FORCE_ON << (index ? 16 : 0);
+	bool changed;
+
+	if (on)
+		changed = (test_and_set_bit(mask, &priv->led_state) != mask);
+	else
+		changed = !!test_and_clear_bit(mask, &priv->led_state);
+
+	changed |= !!test_and_clear_bit(MTK_PHY_LED_STATE_NETDEV <<
+					(index ? 16 : 0), &priv->led_state);
+	if (changed)
+		return phy_modify_mmd(phydev, MDIO_MMD_VEND2, index ?
+				      MTK_PHY_LED1_ON_CTRL : MTK_PHY_LED0_ON_CTRL,
+				      MTK_PHY_LED_ON_MASK,
+				      on ? MTK_PHY_LED_ON_FORCE_ON : 0);
+	else
+		return 0;
+}
+
+static int mt798x_phy_hw_led_blink_set(struct phy_device *phydev, u8 index,
+				       bool blinking)
+{
+	struct mtk_socphy_priv *priv = phydev->priv;
+	u32 mask = MTK_PHY_LED_STATE_FORCE_BLINK << (index ? 16 : 0);
+	bool changed;
+
+	if (blinking)
+		changed = (test_and_set_bit(mask, &priv->led_state) != mask);
+	else
+		changed = !!test_and_clear_bit(mask, &priv->led_state);
+
+	changed |= !!test_bit(MTK_PHY_LED_STATE_NETDEV << (index ? 16 : 0), &priv->led_state);
+	if (changed)
+		return phy_write_mmd(phydev, MDIO_MMD_VEND2, index ?
+				     MTK_PHY_LED1_BLINK_CTRL : MTK_PHY_LED0_BLINK_CTRL,
+				     blinking ? MTK_PHY_LED_BLINK_FORCE_BLINK : 0);
+	else
+		return 0;
+}
+
+static int mt798x_phy_led_blink_set(struct phy_device *phydev, u8 index,
+				    unsigned long *delay_on,
+				    unsigned long *delay_off)
+{
+	bool blinking = false;
+	int err = 0;
+
+	if (index > 1)
+		return -EINVAL;
+
+	if (delay_on && delay_off && (*delay_on > 0) && (*delay_off > 0)) {
+		blinking = true;
+		*delay_on = 50;
+		*delay_off = 50;
+	}
+
+	err = mt798x_phy_hw_led_blink_set(phydev, index, blinking);
+	if (err)
+		return err;
+
+	return mt798x_phy_hw_led_on_set(phydev, index, false);
+}
+
+static int mt798x_phy_led_brightness_set(struct phy_device *phydev,
+					 u8 index, enum led_brightness value)
+{
+	int err;
+
+	err = mt798x_phy_hw_led_blink_set(phydev, index, false);
+	if (err)
+		return err;
+
+	return mt798x_phy_hw_led_on_set(phydev, index, (value != LED_OFF));
+}
+
+static const unsigned long supported_triggers = (BIT(TRIGGER_NETDEV_FULL_DUPLEX) |
+						 BIT(TRIGGER_NETDEV_HALF_DUPLEX) |
+						 BIT(TRIGGER_NETDEV_LINK)        |
+						 BIT(TRIGGER_NETDEV_LINK_10)     |
+						 BIT(TRIGGER_NETDEV_LINK_100)    |
+						 BIT(TRIGGER_NETDEV_LINK_1000)   |
+						 BIT(TRIGGER_NETDEV_RX)          |
+						 BIT(TRIGGER_NETDEV_TX));
+
+static int mt798x_phy_led_hw_is_supported(struct phy_device *phydev, u8 index,
+					  unsigned long rules)
+{
+	if (index > 1)
+		return -EINVAL;
+
+	/* All combinations of the supported triggers are allowed */
+	if (rules & ~supported_triggers)
+		return -EOPNOTSUPP;
+
+	return 0;
+};
+
+static int mt798x_phy_led_hw_control_get(struct phy_device *phydev, u8 index,
+					 unsigned long *rules)
+{
+	u32 blink_mask = MTK_PHY_LED_STATE_FORCE_BLINK << (index ? 16 : 0);
+	u32 netdev_mask = MTK_PHY_LED_STATE_NETDEV << (index ? 16 : 0);
+	u32 on_mask = MTK_PHY_LED_STATE_FORCE_ON << (index ? 16 : 0);
+	struct mtk_socphy_priv *priv = phydev->priv;
+	int on, blink;
+
+	if (index > 1)
+		return -EINVAL;
+
+	on = phy_read_mmd(phydev, MDIO_MMD_VEND2,
+			  index ? MTK_PHY_LED1_ON_CTRL : MTK_PHY_LED0_ON_CTRL);
+
+	if (on < 0)
+		return -EIO;
+
+	blink = phy_read_mmd(phydev, MDIO_MMD_VEND2,
+			     index ? MTK_PHY_LED1_BLINK_CTRL :
+				     MTK_PHY_LED0_BLINK_CTRL);
+	if (blink < 0)
+		return -EIO;
+
+	if ((on & (MTK_PHY_LED_ON_LINK1000 | MTK_PHY_LED_ON_LINK100 |
+		   MTK_PHY_LED_ON_LINK10)) ||
+	    (blink & (MTK_PHY_LED_BLINK_1000RX | MTK_PHY_LED_BLINK_100RX |
+		      MTK_PHY_LED_BLINK_10RX | MTK_PHY_LED_BLINK_1000TX |
+		      MTK_PHY_LED_BLINK_100TX | MTK_PHY_LED_BLINK_10TX)))
+		set_bit(netdev_mask, &priv->led_state);
+	else
+		clear_bit(netdev_mask, &priv->led_state);
+
+	if (on & MTK_PHY_LED_ON_FORCE_ON)
+		set_bit(on_mask, &priv->led_state);
+	else
+		clear_bit(on_mask, &priv->led_state);
+
+	if (blink & MTK_PHY_LED_BLINK_FORCE_BLINK)
+		set_bit(blink_mask, &priv->led_state);
+	else
+		clear_bit(blink_mask, &priv->led_state);
+
+	if (!rules)
+		return 0;
+
+	if (on & (MTK_PHY_LED_ON_LINK1000 | MTK_PHY_LED_ON_LINK100 | MTK_PHY_LED_ON_LINK10))
+		*rules |= BIT(TRIGGER_NETDEV_LINK);
+
+	if (on & MTK_PHY_LED_ON_LINK10)
+		*rules |= BIT(TRIGGER_NETDEV_LINK_10);
+
+	if (on & MTK_PHY_LED_ON_LINK100)
+		*rules |= BIT(TRIGGER_NETDEV_LINK_100);
+
+	if (on & MTK_PHY_LED_ON_LINK1000)
+		*rules |= BIT(TRIGGER_NETDEV_LINK_1000);
+
+	if (on & MTK_PHY_LED_ON_FDX)
+		*rules |= BIT(TRIGGER_NETDEV_FULL_DUPLEX);
+
+	if (on & MTK_PHY_LED_ON_HDX)
+		*rules |= BIT(TRIGGER_NETDEV_HALF_DUPLEX);
+
+	if (blink & (MTK_PHY_LED_BLINK_1000RX | MTK_PHY_LED_BLINK_100RX | MTK_PHY_LED_BLINK_10RX))
+		*rules |= BIT(TRIGGER_NETDEV_RX);
+
+	if (blink & (MTK_PHY_LED_BLINK_1000TX | MTK_PHY_LED_BLINK_100TX | MTK_PHY_LED_BLINK_10TX))
+		*rules |= BIT(TRIGGER_NETDEV_TX);
+
+	return 0;
+};
+
+static int mt798x_phy_led_hw_control_set(struct phy_device *phydev, u8 index,
+					 unsigned long rules)
+{
+	u32 mask = MTK_PHY_LED_STATE_NETDEV << (index ? 16 : 0);
+	struct mtk_socphy_priv *priv = phydev->priv;
+	u16 on = 0, blink = 0;
+	int ret;
+
+	if (index > 1)
+		return -EINVAL;
+
+	if (rules & BIT(TRIGGER_NETDEV_FULL_DUPLEX))
+		on |= MTK_PHY_LED_ON_FDX;
+
+	if (rules & BIT(TRIGGER_NETDEV_HALF_DUPLEX))
+		on |= MTK_PHY_LED_ON_HDX;
+
+	if (rules & (BIT(TRIGGER_NETDEV_LINK_10) | BIT(TRIGGER_NETDEV_LINK)))
+		on |= MTK_PHY_LED_ON_LINK10;
+
+	if (rules & (BIT(TRIGGER_NETDEV_LINK_100) | BIT(TRIGGER_NETDEV_LINK)))
+		on |= MTK_PHY_LED_ON_LINK100;
+
+	if (rules & (BIT(TRIGGER_NETDEV_LINK_1000) | BIT(TRIGGER_NETDEV_LINK)))
+		on |= MTK_PHY_LED_ON_LINK1000;
+
+	if (rules & BIT(TRIGGER_NETDEV_RX)) {
+		blink |= MTK_PHY_LED_BLINK_10RX  |
+			 MTK_PHY_LED_BLINK_100RX |
+			 MTK_PHY_LED_BLINK_1000RX;
+	}
+
+	if (rules & BIT(TRIGGER_NETDEV_TX)) {
+		blink |= MTK_PHY_LED_BLINK_10TX  |
+			 MTK_PHY_LED_BLINK_100TX |
+			 MTK_PHY_LED_BLINK_1000TX;
+	}
+
+	if (blink || on)
+		set_bit(mask, &priv->led_state);
+	else
+		clear_bit(mask, &priv->led_state);
+
+	ret = phy_modify_mmd(phydev, MDIO_MMD_VEND2, index ?
+				MTK_PHY_LED1_ON_CTRL :
+				MTK_PHY_LED0_ON_CTRL,
+			     MTK_PHY_LED_ON_FDX     |
+			     MTK_PHY_LED_ON_HDX     |
+			     MTK_PHY_LED_ON_LINK10  |
+			     MTK_PHY_LED_ON_LINK100 |
+			     MTK_PHY_LED_ON_LINK1000,
+			     on);
+
+	if (ret)
+		return ret;
+
+	return phy_write_mmd(phydev, MDIO_MMD_VEND2, index ?
+				MTK_PHY_LED1_BLINK_CTRL :
+				MTK_PHY_LED0_BLINK_CTRL, blink);
+};
+
+static bool mt7988_phy_led_get_polarity(struct phy_device *phydev, int led_num)
+{
+	struct mtk_socphy_shared *priv = phydev->shared->priv;
+	u32 polarities;
+
+	if (led_num == 0)
+		polarities = ~(priv->boottrap);
+	else
+		polarities = MTK_PHY_LED1_DEFAULT_POLARITIES;
+
+	if (polarities & BIT(phydev->mdio.addr))
+		return true;
+
+	return false;
+}
+
+static int mt7988_phy_fix_leds_polarities(struct phy_device *phydev)
+{
+	struct pinctrl *pinctrl;
+	int index;
+
+	/* Setup LED polarity according to bootstrap use of LED pins */
+	for (index = 0; index < 2; ++index)
+		phy_modify_mmd(phydev, MDIO_MMD_VEND2, index ?
+				MTK_PHY_LED1_ON_CTRL : MTK_PHY_LED0_ON_CTRL,
+			       MTK_PHY_LED_ON_POLARITY,
+			       mt7988_phy_led_get_polarity(phydev, index) ?
+				MTK_PHY_LED_ON_POLARITY : 0);
+
+	/* Only now setup pinctrl to avoid bogus blinking */
+	pinctrl = devm_pinctrl_get_select(&phydev->mdio.dev, "gbe-led");
+	if (IS_ERR(pinctrl))
+		dev_err(&phydev->mdio.bus->dev, "Failed to setup PHY LED pinctrl\n");
+
+	return 0;
+}
+
+static int mt7988_phy_probe_shared(struct phy_device *phydev)
+{
+	struct device_node *np = dev_of_node(&phydev->mdio.bus->dev);
+	struct mtk_socphy_shared *shared = phydev->shared->priv;
+	struct regmap *regmap;
+	u32 reg;
+	int ret;
+
+	/* The LED0 of the 4 PHYs in MT7988 are wired to SoC pins LED_A, LED_B,
+	 * LED_C and LED_D respectively. At the same time those pins are used to
+	 * bootstrap configuration of the reference clock source (LED_A),
+	 * DRAM DDRx16b x2/x1 (LED_B) and boot device (LED_C, LED_D).
+	 * In practise this is done using a LED and a resistor pulling the pin
+	 * either to GND or to VIO.
+	 * The detected value at boot time is accessible at run-time using the
+	 * TPBANK0 register located in the gpio base of the pinctrl, in order
+	 * to read it here it needs to be referenced by a phandle called
+	 * 'mediatek,pio' in the MDIO bus hosting the PHY.
+	 * The 4 bits in TPBANK0 are kept as package shared data and are used to
+	 * set LED polarity for each of the LED0.
+	 */
+	regmap = syscon_regmap_lookup_by_phandle(np, "mediatek,pio");
+	if (IS_ERR(regmap))
+		return PTR_ERR(regmap);
+
+	ret = regmap_read(regmap, RG_GPIO_MISC_TPBANK0, &reg);
+	if (ret)
+		return ret;
+
+	shared->boottrap = FIELD_GET(RG_GPIO_MISC_TPBANK0_BOOTMODE, reg);
+
+	return 0;
+}
+
+static void mt798x_phy_leds_state_init(struct phy_device *phydev)
+{
+	int i;
+
+	for (i = 0; i < 2; ++i)
+		mt798x_phy_led_hw_control_get(phydev, i, NULL);
+}
+
+static int mt7988_phy_probe(struct phy_device *phydev)
+{
+	struct mtk_socphy_shared *shared;
+	struct mtk_socphy_priv *priv;
+	int err;
+
+	if (phydev->mdio.addr > 3)
+		return -EINVAL;
+
+	err = devm_phy_package_join(&phydev->mdio.dev, phydev, 0,
+				    sizeof(struct mtk_socphy_shared));
+	if (err)
+		return err;
+
+	if (phy_package_probe_once(phydev)) {
+		err = mt7988_phy_probe_shared(phydev);
+		if (err)
+			return err;
+	}
+
+	shared = phydev->shared->priv;
+	priv = &shared->priv[phydev->mdio.addr];
+
+	phydev->priv = priv;
+
+	mt798x_phy_leds_state_init(phydev);
+
+	err = mt7988_phy_fix_leds_polarities(phydev);
+	if (err)
+		return err;
+
+	return mt798x_phy_calibration(phydev);
+}
+
+static int mt7981_phy_probe(struct phy_device *phydev)
+{
+	struct mtk_socphy_priv *priv;
+
+	priv = devm_kzalloc(&phydev->mdio.dev, sizeof(struct mtk_socphy_priv),
+			    GFP_KERNEL);
+	if (!priv)
+		return -ENOMEM;
+
+	mt798x_phy_leds_state_init(phydev);
+
+	phydev->priv = priv;
+
+	return mt798x_phy_calibration(phydev);
+}
+
 static struct phy_driver mtk_socphy_driver[] = {
 	{
 		PHY_ID_MATCH_EXACT(MTK_GPHY_ID_MT7981),
@@ -1078,11 +1483,16 @@ static struct phy_driver mtk_socphy_driver[] = {
 		.config_init	= mt798x_phy_config_init,
 		.config_intr	= genphy_no_config_intr,
 		.handle_interrupt = genphy_handle_interrupt_no_ack,
-		.probe		= mt798x_phy_calibration,
+		.probe		= mt7981_phy_probe,
 		.suspend	= genphy_suspend,
 		.resume		= genphy_resume,
 		.read_page	= mtk_socphy_read_page,
 		.write_page	= mtk_socphy_write_page,
+		.led_blink_set	= mt798x_phy_led_blink_set,
+		.led_brightness_set = mt798x_phy_led_brightness_set,
+		.led_hw_is_supported = mt798x_phy_led_hw_is_supported,
+		.led_hw_control_set = mt798x_phy_led_hw_control_set,
+		.led_hw_control_get = mt798x_phy_led_hw_control_get,
 	},
 	{
 		PHY_ID_MATCH_EXACT(MTK_GPHY_ID_MT7988),
@@ -1090,11 +1500,16 @@ static struct phy_driver mtk_socphy_driver[] = {
 		.config_init	= mt798x_phy_config_init,
 		.config_intr	= genphy_no_config_intr,
 		.handle_interrupt = genphy_handle_interrupt_no_ack,
-		.probe		= mt798x_phy_calibration,
+		.probe		= mt7988_phy_probe,
 		.suspend	= genphy_suspend,
 		.resume		= genphy_resume,
 		.read_page	= mtk_socphy_read_page,
 		.write_page	= mtk_socphy_write_page,
+		.led_blink_set	= mt798x_phy_led_blink_set,
+		.led_brightness_set = mt798x_phy_led_brightness_set,
+		.led_hw_is_supported = mt798x_phy_led_hw_is_supported,
+		.led_hw_control_set = mt798x_phy_led_hw_control_set,
+		.led_hw_control_get = mt798x_phy_led_hw_control_get,
 	},
 };
 
-- 
2.41.0

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