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Date: Wed, 30 Mar 2022 00:19:49 +0800
From: Potin Lai <potin.lai@...ntatw.com>
To: Andrew Lunn <andrew@...n.ch>,
Heiner Kallweit <hkallweit1@...il.com>,
Russell King <linux@...linux.org.uk>,
"David S. Miller" <davem@...emloft.net>,
Jakub Kicinski <kuba@...nel.org>,
Joel Stanley <joel@....id.au>, Andrew Jeffery <andrew@...id.au>
Cc: Patrick Williams <patrick@...cx.xyz>,
Potin Lai <potin.lai@...ntatw.com>, netdev@...r.kernel.org,
linux-arm-kernel@...ts.infradead.org,
linux-aspeed@...ts.ozlabs.org, linux-kernel@...r.kernel.org
Subject: [PATCH 1/1] net: mdio: aspeed: Add Clause 45 support
Add Clause 45 support for Aspeed mdio driver.
Signed-off-by: Potin Lai <potin.lai@...ntatw.com>
---
drivers/net/mdio/mdio-aspeed.c | 122 ++++++++++++++++++++++++---------
1 file changed, 88 insertions(+), 34 deletions(-)
diff --git a/drivers/net/mdio/mdio-aspeed.c b/drivers/net/mdio/mdio-aspeed.c
index e2273588c75b..aa2b678b2381 100644
--- a/drivers/net/mdio/mdio-aspeed.c
+++ b/drivers/net/mdio/mdio-aspeed.c
@@ -21,6 +21,10 @@
#define ASPEED_MDIO_CTRL_OP GENMASK(27, 26)
#define MDIO_C22_OP_WRITE 0b01
#define MDIO_C22_OP_READ 0b10
+#define MDIO_C45_OP_ADDR 0b00
+#define MDIO_C45_OP_WRITE 0b01
+#define MDIO_C45_OP_PREAD 0b10
+#define MDIO_C45_OP_READ 0b11
#define ASPEED_MDIO_CTRL_PHYAD GENMASK(25, 21)
#define ASPEED_MDIO_CTRL_REGAD GENMASK(20, 16)
#define ASPEED_MDIO_CTRL_MIIWDATA GENMASK(15, 0)
@@ -39,34 +43,35 @@ struct aspeed_mdio {
void __iomem *base;
};
-static int aspeed_mdio_read(struct mii_bus *bus, int addr, int regnum)
+static int aspeed_mdio_ctrl_reg(struct mii_bus *bus, u8 st, u8 op, u8 phyad,
+ u8 regad, u16 data)
{
struct aspeed_mdio *ctx = bus->priv;
u32 ctrl;
- u32 data;
- int rc;
-
- dev_dbg(&bus->dev, "%s: addr: %d, regnum: %d\n", __func__, addr,
- regnum);
- /* Just clause 22 for the moment */
- if (regnum & MII_ADDR_C45)
- return -EOPNOTSUPP;
+ dev_dbg(&bus->dev, "%s: st: %u op: %u, phyad: %u, regad: %u, data: %u\n",
+ __func__, st, op, phyad, regad, data);
ctrl = ASPEED_MDIO_CTRL_FIRE
- | FIELD_PREP(ASPEED_MDIO_CTRL_ST, ASPEED_MDIO_CTRL_ST_C22)
- | FIELD_PREP(ASPEED_MDIO_CTRL_OP, MDIO_C22_OP_READ)
- | FIELD_PREP(ASPEED_MDIO_CTRL_PHYAD, addr)
- | FIELD_PREP(ASPEED_MDIO_CTRL_REGAD, regnum);
+ | FIELD_PREP(ASPEED_MDIO_CTRL_ST, st)
+ | FIELD_PREP(ASPEED_MDIO_CTRL_OP, op)
+ | FIELD_PREP(ASPEED_MDIO_CTRL_PHYAD, phyad)
+ | FIELD_PREP(ASPEED_MDIO_CTRL_REGAD, regad)
+ | FIELD_PREP(ASPEED_MDIO_DATA_MIIRDATA, data);
iowrite32(ctrl, ctx->base + ASPEED_MDIO_CTRL);
- rc = readl_poll_timeout(ctx->base + ASPEED_MDIO_CTRL, ctrl,
+ return readl_poll_timeout(ctx->base + ASPEED_MDIO_CTRL, ctrl,
!(ctrl & ASPEED_MDIO_CTRL_FIRE),
ASPEED_MDIO_INTERVAL_US,
ASPEED_MDIO_TIMEOUT_US);
- if (rc < 0)
- return rc;
+}
+
+static int aspeed_mdio_read_data_reg(struct mii_bus *bus)
+{
+ struct aspeed_mdio *ctx = bus->priv;
+ int rc;
+ u32 data;
rc = readl_poll_timeout(ctx->base + ASPEED_MDIO_DATA, data,
data & ASPEED_MDIO_DATA_IDLE,
@@ -78,31 +83,80 @@ static int aspeed_mdio_read(struct mii_bus *bus, int addr, int regnum)
return FIELD_GET(ASPEED_MDIO_DATA_MIIRDATA, data);
}
-static int aspeed_mdio_write(struct mii_bus *bus, int addr, int regnum, u16 val)
+static int aspeed_mdio_c45_read(struct mii_bus *bus, int addr, int regnum)
{
- struct aspeed_mdio *ctx = bus->priv;
- u32 ctrl;
+ int rc;
+ u8 c45_dev = (regnum >> 16) & 0x1F;
+ u16 c45_addr = regnum & 0xFFFF;
- dev_dbg(&bus->dev, "%s: addr: %d, regnum: %d, val: 0x%x\n",
- __func__, addr, regnum, val);
+ rc = aspeed_mdio_ctrl_reg(bus, ASPEED_MDIO_CTRL_ST_C45,
+ MDIO_C45_OP_ADDR, addr, c45_dev, c45_addr);
+ if (rc < 0)
+ return rc;
+
+ rc = aspeed_mdio_ctrl_reg(bus, ASPEED_MDIO_CTRL_ST_C45,
+ MDIO_C45_OP_READ, addr, c45_dev, 0);
+ if (rc < 0)
+ return rc;
+
+ return aspeed_mdio_read_data_reg(bus);
+}
+
+static int aspeed_mdio_c22_read(struct mii_bus *bus, int addr, int regnum)
+{
+ int rc;
+
+ rc = aspeed_mdio_ctrl_reg(bus, ASPEED_MDIO_CTRL_ST_C22,
+ MDIO_C22_OP_READ, addr, regnum, 0);
+ if (rc < 0)
+ return rc;
+
+ return aspeed_mdio_read_data_reg(bus);
+}
+
+static int aspeed_mdio_read(struct mii_bus *bus, int addr, int regnum)
+{
+ dev_dbg(&bus->dev, "%s: addr: %d, regnum: %d\n", __func__, addr,
+ regnum);
- /* Just clause 22 for the moment */
if (regnum & MII_ADDR_C45)
- return -EOPNOTSUPP;
+ return aspeed_mdio_c45_read(bus, addr, regnum);
- ctrl = ASPEED_MDIO_CTRL_FIRE
- | FIELD_PREP(ASPEED_MDIO_CTRL_ST, ASPEED_MDIO_CTRL_ST_C22)
- | FIELD_PREP(ASPEED_MDIO_CTRL_OP, MDIO_C22_OP_WRITE)
- | FIELD_PREP(ASPEED_MDIO_CTRL_PHYAD, addr)
- | FIELD_PREP(ASPEED_MDIO_CTRL_REGAD, regnum)
- | FIELD_PREP(ASPEED_MDIO_CTRL_MIIWDATA, val);
+ return aspeed_mdio_c22_read(bus, addr, regnum);
+}
- iowrite32(ctrl, ctx->base + ASPEED_MDIO_CTRL);
+static int aspeed_mdio_c45_write(struct mii_bus *bus, int addr, int regnum,
+ u16 val)
+{
+ int rc;
+ u8 c45_dev = (regnum >> 16) & 0x1F;
+ u16 c45_addr = regnum & 0xFFFF;
- return readl_poll_timeout(ctx->base + ASPEED_MDIO_CTRL, ctrl,
- !(ctrl & ASPEED_MDIO_CTRL_FIRE),
- ASPEED_MDIO_INTERVAL_US,
- ASPEED_MDIO_TIMEOUT_US);
+ rc = aspeed_mdio_ctrl_reg(bus, ASPEED_MDIO_CTRL_ST_C45,
+ MDIO_C45_OP_ADDR, addr, c45_dev, c45_addr);
+ if (rc < 0)
+ return rc;
+
+ return aspeed_mdio_ctrl_reg(bus, ASPEED_MDIO_CTRL_ST_C45,
+ MDIO_C45_OP_WRITE, addr, c45_dev, val);
+}
+
+static int aspeed_mdio_c22_write(struct mii_bus *bus, int addr, int regnum,
+ u16 val)
+{
+ return aspeed_mdio_ctrl_reg(bus, ASPEED_MDIO_CTRL_ST_C22,
+ MDIO_C22_OP_WRITE, addr, regnum, val);
+}
+
+static int aspeed_mdio_write(struct mii_bus *bus, int addr, int regnum, u16 val)
+{
+ dev_dbg(&bus->dev, "%s: addr: %d, regnum: %d, val: 0x%x\n",
+ __func__, addr, regnum, val);
+
+ if (regnum & MII_ADDR_C45)
+ return aspeed_mdio_c45_write(bus, addr, regnum, val);
+
+ return aspeed_mdio_c22_write(bus, addr, regnum, val);
}
static int aspeed_mdio_probe(struct platform_device *pdev)
--
2.17.1
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