net: dsa: ocelot: felix: utilize shared mscc-miim driver for indirect MDIO access

Switch to a shared MDIO access implementation by way of the mdio-mscc-miim
driver.

Signed-off-by: Colin Foster <colin.foster@in-advantage.com>
Tested-by: Vladimir Oltean <vladimir.oltean@nxp.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

2 files changed, 10 insertions, 93 deletions

diff --git a/drivers/net/dsa/ocelot/Kconfig b/drivers/net/dsa/ocelot/Kconfig
index 9948544ba1c4..220b0b027b55 100644
--- a/drivers/net/dsa/ocelot/Kconfig
+++ b/drivers/net/dsa/ocelot/Kconfig
@@ -21,6 +21,7 @@ config NET_DSA_MSCC_SEVILLE
 	depends on NET_VENDOR_MICROSEMI
 	depends on HAS_IOMEM
 	depends on PTP_1588_CLOCK_OPTIONAL
+	select MDIO_MSCC_MIIM
 	select MSCC_OCELOT_SWITCH_LIB
 	select NET_DSA_TAG_OCELOT_8021Q
 	select NET_DSA_TAG_OCELOT
diff --git a/drivers/net/dsa/ocelot/seville_vsc9953.c b/drivers/net/dsa/ocelot/seville_vsc9953.c
index db124922c374..b9be889016ce 100644
--- a/drivers/net/dsa/ocelot/seville_vsc9953.c
+++ b/drivers/net/dsa/ocelot/seville_vsc9953.c
@@ -6,19 +6,14 @@
 #include <soc/mscc/ocelot_vcap.h>
 #include <soc/mscc/ocelot_sys.h>
 #include <soc/mscc/ocelot.h>
+#include <linux/mdio/mdio-mscc-miim.h>
+#include <linux/of_mdio.h>
 #include <linux/of_platform.h>
 #include <linux/pcs-lynx.h>
 #include <linux/dsa/ocelot.h>
 #include <linux/iopoll.h>
-#include <linux/of_mdio.h>
 #include "felix.h"
 
-#define MSCC_MIIM_CMD_OPR_WRITE			BIT(1)
-#define MSCC_MIIM_CMD_OPR_READ			BIT(2)
-#define MSCC_MIIM_CMD_WRDATA_SHIFT		4
-#define MSCC_MIIM_CMD_REGAD_SHIFT		20
-#define MSCC_MIIM_CMD_PHYAD_SHIFT		25
-#define MSCC_MIIM_CMD_VLD			BIT(31)
 #define VSC9953_VCAP_POLICER_BASE		11
 #define VSC9953_VCAP_POLICER_MAX		31
 #define VSC9953_VCAP_POLICER_BASE2		120
@@ -862,7 +857,6 @@ static struct vcap_props vsc9953_vcap_props[] = {
 #define VSC9953_INIT_TIMEOUT			50000
 #define VSC9953_GCB_RST_SLEEP			100
 #define VSC9953_SYS_RAMINIT_SLEEP		80
-#define VCS9953_MII_TIMEOUT			10000
 
 static int vsc9953_gcb_soft_rst_status(struct ocelot *ocelot)
 {
@@ -882,82 +876,6 @@ static int vsc9953_sys_ram_init_status(struct ocelot *ocelot)
 	return val;
 }
 
-static int vsc9953_gcb_miim_pending_status(struct ocelot *ocelot)
-{
-	int val;
-
-	ocelot_field_read(ocelot, GCB_MIIM_MII_STATUS_PENDING, &val);
-
-	return val;
-}
-
-static int vsc9953_gcb_miim_busy_status(struct ocelot *ocelot)
-{
-	int val;
-
-	ocelot_field_read(ocelot, GCB_MIIM_MII_STATUS_BUSY, &val);
-
-	return val;
-}
-
-static int vsc9953_mdio_write(struct mii_bus *bus, int phy_id, int regnum,
-			      u16 value)
-{
-	struct ocelot *ocelot = bus->priv;
-	int err, cmd, val;
-
-	/* Wait while MIIM controller becomes idle */
-	err = readx_poll_timeout(vsc9953_gcb_miim_pending_status, ocelot,
-				 val, !val, 10, VCS9953_MII_TIMEOUT);
-	if (err) {
-		dev_err(ocelot->dev, "MDIO write: pending timeout\n");
-		goto out;
-	}
-
-	cmd = MSCC_MIIM_CMD_VLD | (phy_id << MSCC_MIIM_CMD_PHYAD_SHIFT) |
-	      (regnum << MSCC_MIIM_CMD_REGAD_SHIFT) |
-	      (value << MSCC_MIIM_CMD_WRDATA_SHIFT) |
-	      MSCC_MIIM_CMD_OPR_WRITE;
-
-	ocelot_write(ocelot, cmd, GCB_MIIM_MII_CMD);
-
-out:
-	return err;
-}
-
-static int vsc9953_mdio_read(struct mii_bus *bus, int phy_id, int regnum)
-{
-	struct ocelot *ocelot = bus->priv;
-	int err, cmd, val;
-
-	/* Wait until MIIM controller becomes idle */
-	err = readx_poll_timeout(vsc9953_gcb_miim_pending_status, ocelot,
-				 val, !val, 10, VCS9953_MII_TIMEOUT);
-	if (err) {
-		dev_err(ocelot->dev, "MDIO read: pending timeout\n");
-		goto out;
-	}
-
-	/* Write the MIIM COMMAND register */
-	cmd = MSCC_MIIM_CMD_VLD | (phy_id << MSCC_MIIM_CMD_PHYAD_SHIFT) |
-	      (regnum << MSCC_MIIM_CMD_REGAD_SHIFT) | MSCC_MIIM_CMD_OPR_READ;
-
-	ocelot_write(ocelot, cmd, GCB_MIIM_MII_CMD);
-
-	/* Wait while read operation via the MIIM controller is in progress */
-	err = readx_poll_timeout(vsc9953_gcb_miim_busy_status, ocelot,
-				 val, !val, 10, VCS9953_MII_TIMEOUT);
-	if (err) {
-		dev_err(ocelot->dev, "MDIO read: busy timeout\n");
-		goto out;
-	}
-
-	val = ocelot_read(ocelot, GCB_MIIM_MII_DATA);
-
-	err = val & 0xFFFF;
-out:
-	return err;
-}
 
 /* CORE_ENA is in SYS:SYSTEM:RESET_CFG
  * MEM_INIT is in SYS:SYSTEM:RESET_CFG
@@ -1101,16 +1019,14 @@ static int vsc9953_mdio_bus_alloc(struct ocelot *ocelot)
 		return -ENOMEM;
 	}
 
-	bus = devm_mdiobus_alloc(dev);
-	if (!bus)
-		return -ENOMEM;
+	rc = mscc_miim_setup(dev, &bus, "VSC9953 internal MDIO bus",
+			     ocelot->targets[GCB],
+			     ocelot->map[GCB][GCB_MIIM_MII_STATUS & REG_MASK]);
 
-	bus->name = "VSC9953 internal MDIO bus";
-	bus->read = vsc9953_mdio_read;
-	bus->write = vsc9953_mdio_write;
-	bus->parent = dev;
-	bus->priv = ocelot;
-	snprintf(bus->id, MII_BUS_ID_SIZE, "%s-imdio", dev_name(dev));
+	if (rc) {
+		dev_err(dev, "failed to setup MDIO bus\n");
+		return rc;
+	}
 
 	/* Needed in order to initialize the bus mutex lock */
 	rc = of_mdiobus_register(bus, NULL);