1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3 * Driver for MT7628 Embedded Switch internal Fast Ethernet PHYs
4 */
5 #include <linux/module.h>
6 #include <linux/phy.h>
7
8 #define MTK_FPHY_ID_MT7628 0x03a29410
9 #define MTK_EXT_PAGE_ACCESS 0x1f
10
mt7628_phy_read_page(struct phy_device * phydev)11 static int mt7628_phy_read_page(struct phy_device *phydev)
12 {
13 return __phy_read(phydev, MTK_EXT_PAGE_ACCESS);
14 }
15
mt7628_phy_write_page(struct phy_device * phydev,int page)16 static int mt7628_phy_write_page(struct phy_device *phydev, int page)
17 {
18 return __phy_write(phydev, MTK_EXT_PAGE_ACCESS, page);
19 }
20
mt7628_phy_config_init(struct phy_device * phydev)21 static int mt7628_phy_config_init(struct phy_device *phydev)
22 {
23 /*
24 * This undocumented bit is required for the PHYs to be able to
25 * establish 100mbps links.
26 */
27 return phy_modify_paged(phydev, 0x8000, 30, BIT(13), BIT(13));
28 }
29
30 static struct phy_driver mtk_soc_fe_phy_driver[] = {
31 {
32 PHY_ID_MATCH_EXACT(MTK_FPHY_ID_MT7628),
33 .name = "MediaTek MT7628 PHY",
34 .config_init = mt7628_phy_config_init,
35 .read_page = mt7628_phy_read_page,
36 .write_page = mt7628_phy_write_page,
37 .suspend = genphy_suspend,
38 .resume = genphy_resume,
39 },
40 };
41
42 module_phy_driver(mtk_soc_fe_phy_driver);
43 static const struct mdio_device_id __maybe_unused mtk_soc_fe_phy_tbl[] = {
44 { PHY_ID_MATCH_EXACT(MTK_FPHY_ID_MT7628) },
45 { }
46 };
47
48 MODULE_DESCRIPTION("MediaTek SoC Fast Ethernet PHY driver");
49 MODULE_AUTHOR("Joris Vaisvila <joey@tinyisr.com>");
50 MODULE_LICENSE("GPL");
51
52 MODULE_DEVICE_TABLE(mdio, mtk_soc_fe_phy_tbl);
53