lkml.org 
[lkml]   [2021]   [Dec]   [26]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
Patch in this message
/
Date
From
Subject[PATCH] net: ethernet: mtk_eth_soc: implement Clause 45 MDIO access
Implement read and write access to IEEE 802.3 Clause 45 Ethernet
phy registers.
Tested on the Ubiquiti UniFi 6 LR access point featuring
MediaTek MT7622BV WiSoC with Aquantia AQR112C.

Signed-off-by: Daniel Golle <daniel@makrotopia.org>
---
drivers/net/ethernet/mediatek/mtk_eth_soc.c | 56 ++++++++++++++++++---
drivers/net/ethernet/mediatek/mtk_eth_soc.h | 3 ++
2 files changed, 51 insertions(+), 8 deletions(-)

diff --git a/drivers/net/ethernet/mediatek/mtk_eth_soc.c b/drivers/net/ethernet/mediatek/mtk_eth_soc.c
index bcb91b01e69f5..9f896a90a4c4c 100644
--- a/drivers/net/ethernet/mediatek/mtk_eth_soc.c
+++ b/drivers/net/ethernet/mediatek/mtk_eth_soc.c
@@ -102,10 +102,30 @@ static u32 _mtk_mdio_write(struct mtk_eth *eth, u32 phy_addr,

write_data &= 0xffff;

- mtk_w32(eth, PHY_IAC_ACCESS | PHY_IAC_START | PHY_IAC_WRITE |
- (phy_register << PHY_IAC_REG_SHIFT) |
- (phy_addr << PHY_IAC_ADDR_SHIFT) | write_data,
- MTK_PHY_IAC);
+ if (phy_register & MII_ADDR_C45) {
+ u8 dev_num = (phy_register >> 16) & 0x1f;
+ u16 reg = (u16)(phy_register & 0xffff);
+
+ mtk_w32(eth, PHY_IAC_ACCESS | PHY_IAC_START_C45 | PHY_IAC_SET_ADDR |
+ (phy_addr << PHY_IAC_ADDR_SHIFT) |
+ (dev_num << PHY_IAC_REG_SHIFT) |
+ reg,
+ MTK_PHY_IAC);
+
+ if (mtk_mdio_busy_wait(eth))
+ return 0xffff;
+
+ mtk_w32(eth, PHY_IAC_ACCESS | PHY_IAC_START_C45 | PHY_IAC_WRITE |
+ (phy_addr << PHY_IAC_ADDR_SHIFT) |
+ (dev_num << PHY_IAC_REG_SHIFT) |
+ write_data,
+ MTK_PHY_IAC);
+ } else {
+ mtk_w32(eth, PHY_IAC_ACCESS | PHY_IAC_START | PHY_IAC_WRITE |
+ (phy_register << PHY_IAC_REG_SHIFT) |
+ (phy_addr << PHY_IAC_ADDR_SHIFT) | write_data,
+ MTK_PHY_IAC);
+ }

if (mtk_mdio_busy_wait(eth))
return -1;
@@ -120,10 +140,29 @@ static u32 _mtk_mdio_read(struct mtk_eth *eth, int phy_addr, int phy_reg)
if (mtk_mdio_busy_wait(eth))
return 0xffff;

- mtk_w32(eth, PHY_IAC_ACCESS | PHY_IAC_START | PHY_IAC_READ |
- (phy_reg << PHY_IAC_REG_SHIFT) |
- (phy_addr << PHY_IAC_ADDR_SHIFT),
- MTK_PHY_IAC);
+ if (phy_reg & MII_ADDR_C45) {
+ u8 dev_num = (phy_reg >> 16) & 0x1f;
+ u16 reg = (u16)(phy_reg & 0xffff);
+
+ mtk_w32(eth, PHY_IAC_ACCESS | PHY_IAC_START_C45 | PHY_IAC_SET_ADDR |
+ (phy_addr << PHY_IAC_ADDR_SHIFT) |
+ (dev_num << PHY_IAC_REG_SHIFT) |
+ reg,
+ MTK_PHY_IAC);
+
+ if (mtk_mdio_busy_wait(eth))
+ return 0xffff;
+
+ mtk_w32(eth, PHY_IAC_ACCESS | PHY_IAC_START_C45 | PHY_IAC_READ_C45 |
+ (phy_addr << PHY_IAC_ADDR_SHIFT) |
+ (dev_num << PHY_IAC_REG_SHIFT),
+ MTK_PHY_IAC);
+ } else {
+ mtk_w32(eth, PHY_IAC_ACCESS | PHY_IAC_START | PHY_IAC_READ |
+ (phy_reg << PHY_IAC_REG_SHIFT) |
+ (phy_addr << PHY_IAC_ADDR_SHIFT),
+ MTK_PHY_IAC);
+ }

if (mtk_mdio_busy_wait(eth))
return 0xffff;
@@ -497,6 +536,7 @@ static int mtk_mdio_init(struct mtk_eth *eth)
eth->mii_bus->name = "mdio";
eth->mii_bus->read = mtk_mdio_read;
eth->mii_bus->write = mtk_mdio_write;
+ eth->mii_bus->probe_capabilities = MDIOBUS_C22_C45;
eth->mii_bus->priv = eth;
eth->mii_bus->parent = eth->dev;

diff --git a/drivers/net/ethernet/mediatek/mtk_eth_soc.h b/drivers/net/ethernet/mediatek/mtk_eth_soc.h
index 5ef70dd8b49c6..b73d8adc9d24c 100644
--- a/drivers/net/ethernet/mediatek/mtk_eth_soc.h
+++ b/drivers/net/ethernet/mediatek/mtk_eth_soc.h
@@ -341,9 +341,12 @@
/* PHY Indirect Access Control registers */
#define MTK_PHY_IAC 0x10004
#define PHY_IAC_ACCESS BIT(31)
+#define PHY_IAC_SET_ADDR 0
#define PHY_IAC_READ BIT(19)
+#define PHY_IAC_READ_C45 (BIT(18) | BIT(19))
#define PHY_IAC_WRITE BIT(18)
#define PHY_IAC_START BIT(16)
+#define PHY_IAC_START_C45 0
#define PHY_IAC_ADDR_SHIFT 20
#define PHY_IAC_REG_SHIFT 25
#define PHY_IAC_TIMEOUT HZ
--
2.34.1
\
 
 \ /
  Last update: 2021-12-26 22:49    [W:0.220 / U:0.696 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site