lkml.org 
[lkml]   [2021]   [Dec]   [27]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
Patch in this message
/
Date
From
Subject[PATCH v7 2/2] 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>
v7: remove unneeded variables and order OR-ed call parameters
v6: further clean up functions and more cleanly separate patches
v5: fix wrong variable name in first patch covered by follow-up patch
v4: clean-up return values and types, split into two commits
v3: return -1 instead of 0xffff on error in _mtk_mdio_write
v2: use MII_DEVADDR_C45_SHIFT and MII_REGADDR_C45_MASK to extract
device id and register address. Unify read and write functions to
have identical types and parameter names where possible as we are
anyway already replacing both function bodies.

---
drivers/net/ethernet/mediatek/mtk_eth_soc.c | 55 ++++++++++++++++++---
drivers/net/ethernet/mediatek/mtk_eth_soc.h | 3 ++
2 files changed, 50 insertions(+), 8 deletions(-)

diff --git a/drivers/net/ethernet/mediatek/mtk_eth_soc.c b/drivers/net/ethernet/mediatek/mtk_eth_soc.c
index 72b3ae7b5ff8d..ed1820ba9e6ea 100644
--- a/drivers/net/ethernet/mediatek/mtk_eth_soc.c
+++ b/drivers/net/ethernet/mediatek/mtk_eth_soc.c
@@ -102,10 +102,30 @@ static int _mtk_mdio_write(struct mtk_eth *eth, u32 phy_addr, u32 phy_reg,

write_data &= 0xffff;

- mtk_w32(eth, PHY_IAC_ACCESS | PHY_IAC_START | PHY_IAC_WRITE |
- (phy_reg << PHY_IAC_REG_SHIFT) |
- (phy_addr << PHY_IAC_ADDR_SHIFT) | write_data,
- MTK_PHY_IAC);
+ if (phy_reg & MII_ADDR_C45) {
+ u8 dev_num = (phy_reg >> MII_DEVADDR_C45_SHIFT) & GENMASK(4, 0);
+
+ mtk_w32(eth, PHY_IAC_ACCESS | PHY_IAC_START_C45 | PHY_IAC_SET_ADDR |
+ (dev_num << PHY_IAC_REG_SHIFT) |
+ (phy_addr << PHY_IAC_ADDR_SHIFT) |
+ (phy_reg & MII_REGADDR_C45_MASK),
+ MTK_PHY_IAC);
+
+ if (mtk_mdio_busy_wait(eth))
+ return -EBUSY;
+
+ mtk_w32(eth, PHY_IAC_ACCESS | PHY_IAC_START_C45 | PHY_IAC_WRITE |
+ (dev_num << PHY_IAC_REG_SHIFT) |
+ (phy_addr << PHY_IAC_ADDR_SHIFT) |
+ write_data,
+ MTK_PHY_IAC);
+ } else {
+ mtk_w32(eth, PHY_IAC_ACCESS | PHY_IAC_START | PHY_IAC_WRITE |
+ (phy_reg << PHY_IAC_REG_SHIFT) |
+ (phy_addr << PHY_IAC_ADDR_SHIFT) |
+ write_data,
+ MTK_PHY_IAC);
+ }

if (mtk_mdio_busy_wait(eth))
return -EBUSY;
@@ -118,10 +138,28 @@ static int _mtk_mdio_read(struct mtk_eth *eth, u32 phy_addr, u32 phy_reg)
if (mtk_mdio_busy_wait(eth))
return -EBUSY;

- 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 >> MII_DEVADDR_C45_SHIFT) & GENMASK(4, 0);
+
+ mtk_w32(eth, PHY_IAC_ACCESS | PHY_IAC_START_C45 | PHY_IAC_SET_ADDR |
+ (dev_num << PHY_IAC_REG_SHIFT) |
+ (phy_addr << PHY_IAC_ADDR_SHIFT) |
+ (phy_reg & MII_REGADDR_C45_MASK),
+ MTK_PHY_IAC);
+
+ if (mtk_mdio_busy_wait(eth))
+ return -EBUSY;
+
+ mtk_w32(eth, PHY_IAC_ACCESS | PHY_IAC_START_C45 | PHY_IAC_READ_C45 |
+ (dev_num << PHY_IAC_REG_SHIFT) |
+ (phy_addr << PHY_IAC_ADDR_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 -EBUSY;
@@ -493,6 +531,7 @@ 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: 2021-12-28 02:12    [W:0.239 / U:0.024 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site