mediatek: add driver for built-in 2.5G Ethernet PHY

Add driver for the built-in 2.5G Ethernet PHY found in the MT7988 SoC.
To function the PHY also needs firmware files which have not yet been
published via linux-firmware.

Signed-off-by: Daniel Golle <daniel@makrotopia.org>
(cherry picked from commit ef2a831dabacfda6c36c79b8f963b5fdd9b2d080)

1 files changed, 262 insertions, 0 deletions

diff --git a/target/linux/mediatek/files-5.15/drivers/net/phy/mediatek-2p5ge.c b/target/linux/mediatek/files-5.15/drivers/net/phy/mediatek-2p5ge.c
new file mode 100644
index 0000000000..c12e6b8eb6
--- /dev/null
+++ b/target/linux/mediatek/files-5.15/drivers/net/phy/mediatek-2p5ge.c
@@ -0,0 +1,262 @@
+// SPDX-License-Identifier: GPL-2.0+
+#include <linux/bitfield.h>
+#include <linux/firmware.h>
+#include <linux/module.h>
+#include <linux/nvmem-consumer.h>
+#include <linux/of_address.h>
+#include <linux/of_platform.h>
+#include <linux/pinctrl/consumer.h>
+#include <linux/phy.h>
+
+#define MEDAITEK_2P5GE_PHY_DMB_FW "mediatek/mediatek-2p5ge-phy-dmb.bin"
+#define MEDIATEK_2P5GE_PHY_PMB_FW "mediatek/mediatek-2p5ge-phy-pmb.bin"
+
+#define MD32_EN_CFG			0x18
+#define   MD32_EN			BIT(0)
+
+#define BASE100T_STATUS_EXTEND		0x10
+#define BASE1000T_STATUS_EXTEND		0x11
+#define EXTEND_CTRL_AND_STATUS		0x16
+
+#define PHY_AUX_CTRL_STATUS		0x1d
+#define   PHY_AUX_DPX_MASK		GENMASK(5, 5)
+#define   PHY_AUX_SPEED_MASK		GENMASK(4, 2)
+
+/* Registers on MDIO_MMD_VEND1 */
+#define MTK_PHY_LINK_STATUS_MISC	0xa2
+#define   MTK_PHY_FDX_ENABLE		BIT(5)
+
+/* Registers on MDIO_MMD_VEND2 */
+#define MTK_PHY_LED0_ON_CTRL		0x24
+#define   MTK_PHY_LED0_ON_LINK1000	BIT(0)
+#define   MTK_PHY_LED0_ON_LINK100	BIT(1)
+#define   MTK_PHY_LED0_ON_LINK10	BIT(2)
+#define   MTK_PHY_LED0_ON_LINK2500	BIT(7)
+#define   MTK_PHY_LED0_POLARITY		BIT(14)
+
+#define MTK_PHY_LED1_ON_CTRL		0x26
+#define   MTK_PHY_LED1_ON_FDX		BIT(4)
+#define   MTK_PHY_LED1_ON_HDX		BIT(5)
+#define   MTK_PHY_LED1_POLARITY		BIT(14)
+
+enum {
+	PHY_AUX_SPD_10 = 0,
+	PHY_AUX_SPD_100,
+	PHY_AUX_SPD_1000,
+	PHY_AUX_SPD_2500,
+};
+
+static int mt798x_2p5ge_phy_config_init(struct phy_device *phydev)
+{
+	int ret;
+	int i;
+	const struct firmware *fw;
+	struct device *dev = &phydev->mdio.dev;
+	struct device_node *np;
+	void __iomem *dmb_addr;
+	void __iomem *pmb_addr;
+	void __iomem *mcucsr_base;
+	u16 reg;
+	struct pinctrl *pinctrl;
+
+	np = of_find_compatible_node(NULL, NULL, "mediatek,2p5gphy-fw");
+	if (!np)
+		return -ENOENT;
+
+	dmb_addr = of_iomap(np, 0);
+	if (!dmb_addr)
+		return -ENOMEM;
+	pmb_addr = of_iomap(np, 1);
+	if (!pmb_addr)
+		return -ENOMEM;
+	mcucsr_base = of_iomap(np, 2);
+	if (!mcucsr_base)
+		return -ENOMEM;
+
+	ret = request_firmware(&fw, MEDAITEK_2P5GE_PHY_DMB_FW, dev);
+	if (ret) {
+		dev_err(dev, "failed to load firmware: %s, ret: %d\n",
+			MEDAITEK_2P5GE_PHY_DMB_FW, ret);
+		return ret;
+	}
+	for (i = 0; i < fw->size - 1; i += 4)
+		writel(*((uint32_t *)(fw->data + i)), dmb_addr + i);
+	release_firmware(fw);
+
+	ret = request_firmware(&fw, MEDIATEK_2P5GE_PHY_PMB_FW, dev);
+	if (ret) {
+		dev_err(dev, "failed to load firmware: %s, ret: %d\n",
+			MEDIATEK_2P5GE_PHY_PMB_FW, ret);
+		return ret;
+	}
+	for (i = 0; i < fw->size - 1; i += 4)
+		writel(*((uint32_t *)(fw->data + i)), pmb_addr + i);
+	release_firmware(fw);
+
+	reg = readw(mcucsr_base + MD32_EN_CFG);
+	writew(reg | MD32_EN, mcucsr_base + MD32_EN_CFG);
+	dev_dbg(dev, "Firmware loading/trigger ok.\n");
+
+	/* Setup LED */
+	phy_clear_bits_mmd(phydev, MDIO_MMD_VEND2, MTK_PHY_LED0_ON_CTRL,
+			   MTK_PHY_LED0_POLARITY);
+
+	phy_set_bits_mmd(phydev, MDIO_MMD_VEND2, MTK_PHY_LED0_ON_CTRL,
+			 MTK_PHY_LED0_ON_LINK10 |
+			 MTK_PHY_LED0_ON_LINK100 |
+			 MTK_PHY_LED0_ON_LINK1000 |
+			 MTK_PHY_LED0_ON_LINK2500);
+
+	phy_set_bits_mmd(phydev, MDIO_MMD_VEND2, MTK_PHY_LED1_ON_CTRL,
+			 MTK_PHY_LED1_ON_FDX | MTK_PHY_LED1_ON_HDX);
+
+	pinctrl = devm_pinctrl_get_select(&phydev->mdio.dev, "i2p5gbe-led");
+	if (IS_ERR(pinctrl)) {
+		dev_err(&phydev->mdio.dev, "Fail to set LED pins!\n");
+		return PTR_ERR(pinctrl);
+	}
+
+	return 0;
+}
+
+static int mt798x_2p5ge_phy_config_aneg(struct phy_device *phydev)
+{
+	bool changed = false;
+	u32 adv;
+	int ret;
+
+	if (phydev->autoneg == AUTONEG_DISABLE) {
+		/* Configure half duplex with genphy_setup_forced,
+		 * because genphy_c45_pma_setup_forced does not support.
+		 */
+		return phydev->duplex != DUPLEX_FULL
+			? genphy_setup_forced(phydev)
+			: genphy_c45_pma_setup_forced(phydev);
+	}
+
+	ret = genphy_c45_an_config_aneg(phydev);
+	if (ret < 0)
+		return ret;
+	if (ret > 0)
+		changed = true;
+
+	adv = linkmode_adv_to_mii_ctrl1000_t(phydev->advertising);
+	ret = phy_modify_changed(phydev, MII_CTRL1000,
+				 ADVERTISE_1000FULL | ADVERTISE_1000HALF,
+				 adv);
+	if (ret < 0)
+		return ret;
+	if (ret > 0)
+		changed = true;
+
+	return genphy_c45_check_and_restart_aneg(phydev, changed);
+}
+
+static int mt798x_2p5ge_phy_get_features(struct phy_device *phydev)
+{
+	int ret;
+
+	ret = genphy_read_abilities(phydev);
+	if (ret)
+		return ret;
+
+	/* We don't support HDX at MAC layer on mt798x.
+	 * So mask phy's HDX capabilities, too.
+	 */
+	linkmode_set_bit(ETHTOOL_LINK_MODE_10baseT_Full_BIT,
+			 phydev->supported);
+	linkmode_set_bit(ETHTOOL_LINK_MODE_100baseT_Full_BIT,
+			 phydev->supported);
+	linkmode_set_bit(ETHTOOL_LINK_MODE_1000baseT_Full_BIT,
+			 phydev->supported);
+	linkmode_set_bit(ETHTOOL_LINK_MODE_2500baseT_Full_BIT,
+			 phydev->supported);
+	linkmode_set_bit(ETHTOOL_LINK_MODE_Autoneg_BIT, phydev->supported);
+
+	return 0;
+}
+
+static int mt798x_2p5ge_phy_read_status(struct phy_device *phydev)
+{
+	int ret;
+
+	ret = genphy_update_link(phydev);
+	if (ret)
+		return ret;
+
+	phydev->speed = SPEED_UNKNOWN;
+	phydev->duplex = DUPLEX_UNKNOWN;
+	phydev->pause = 0;
+	phydev->asym_pause = 0;
+
+	if (!phydev->link)
+		return 0;
+
+	if (phydev->autoneg == AUTONEG_ENABLE && phydev->autoneg_complete) {
+		ret = genphy_c45_read_lpa(phydev);
+		if (ret < 0)
+			return ret;
+
+		/* Read the link partner's 1G advertisement */
+		ret = phy_read(phydev, MII_STAT1000);
+		if (ret < 0)
+			return ret;
+		mii_stat1000_mod_linkmode_lpa_t(phydev->lp_advertising, ret);
+	} else if (phydev->autoneg == AUTONEG_DISABLE) {
+		linkmode_zero(phydev->lp_advertising);
+	}
+
+	ret = phy_read(phydev, PHY_AUX_CTRL_STATUS);
+	if (ret < 0)
+		return ret;
+
+	switch (FIELD_GET(PHY_AUX_SPEED_MASK, ret)) {
+	case PHY_AUX_SPD_10:
+		phydev->speed = SPEED_10;
+		break;
+	case PHY_AUX_SPD_100:
+		phydev->speed = SPEED_100;
+		break;
+	case PHY_AUX_SPD_1000:
+		phydev->speed = SPEED_1000;
+		break;
+	case PHY_AUX_SPD_2500:
+		phydev->speed = SPEED_2500;
+		phydev->duplex = DUPLEX_FULL; /* 2.5G must be FDX */
+		break;
+	}
+
+	ret = phy_read_mmd(phydev, MDIO_MMD_VEND1, MTK_PHY_LINK_STATUS_MISC);
+	if (ret < 0)
+		return ret;
+
+	phydev->duplex = (ret & MTK_PHY_FDX_ENABLE) ? DUPLEX_FULL : DUPLEX_HALF;
+
+	return 0;
+}
+
+static struct phy_driver mtk_gephy_driver[] = {
+	{
+		PHY_ID_MATCH_EXACT(0x00339c11),
+		.name		= "MediaTek MT798x 2.5GbE PHY",
+		.config_init	= mt798x_2p5ge_phy_config_init,
+		.config_aneg    = mt798x_2p5ge_phy_config_aneg,
+		.get_features	= mt798x_2p5ge_phy_get_features,
+		.read_status	= mt798x_2p5ge_phy_read_status,
+	},
+};
+
+module_phy_driver(mtk_gephy_driver);
+
+static struct mdio_device_id __maybe_unused mtk_2p5ge_phy_tbl[] = {
+	{ PHY_ID_MATCH_VENDOR(0x00339c00) },
+	{ }
+};
+
+MODULE_DESCRIPTION("MediaTek 2.5Gb Ethernet PHY driver");
+MODULE_AUTHOR("SkyLake Huang <SkyLake.Huang@mediatek.com>");
+MODULE_LICENSE("GPL");
+
+MODULE_DEVICE_TABLE(mdio, mtk_2p5ge_phy_tbl);
+MODULE_FIRMWARE(MEDAITEK_2P5GE_PHY_DMB_FW);
+MODULE_FIRMWARE(MEDIATEK_2P5GE_PHY_PMB_FW);