The Asix Electronics PHY found on the X-Surf 100 Amiga Zorro network
card by Individual Computers is buggy, and needs the reset bit toggled
as workaround to make a PHY soft reset succeed.
Add workaround driver just for this special case.
Suggested in xsurf100 patch series review by Andrew Lunn <andrew@xxxxxxx>
Signed-off-by: Michael Schmitz <schmitzmic@xxxxxxxxx>
---
Changes in v4:
Andrew Lunn:
- don't duplicate genphy_soft_reset, just call after writing zero
to control register
---
drivers/net/phy/Kconfig | 6 ++++
drivers/net/phy/Makefile | 1 +
drivers/net/phy/asix.c | 63 ++++++++++++++++++++++++++++++++++++++++++++++
3 files changed, 70 insertions(+), 0 deletions(-)
create mode 100644 drivers/net/phy/asix.c
diff --git a/drivers/net/phy/Kconfig b/drivers/net/phy/Kconfig
index bdfbabb..edb8b9a 100644
--- a/drivers/net/phy/Kconfig
+++ b/drivers/net/phy/Kconfig
@@ -218,6 +218,12 @@ config AQUANTIA_PHY
---help---
Currently supports the Aquantia AQ1202, AQ2104, AQR105, AQR405
+config ASIX_PHY
+ tristate "Asix PHYs"
+ help
+ Currently supports the Asix Electronics PHY found in the X-Surf 100
+ AX88796B package.
+
config AT803X_PHY
tristate "AT803X PHYs"
---help---
diff --git a/drivers/net/phy/Makefile b/drivers/net/phy/Makefile
index 01acbcb..701ca0b 100644
--- a/drivers/net/phy/Makefile
+++ b/drivers/net/phy/Makefile
@@ -45,6 +45,7 @@ obj-y += $(sfp-obj-y) $(sfp-obj-m)
obj-$(CONFIG_AMD_PHY) += amd.o
obj-$(CONFIG_AQUANTIA_PHY) += aquantia.o
+obj-$(CONFIG_ASIX_PHY) += asix.o
obj-$(CONFIG_AT803X_PHY) += at803x.o
obj-$(CONFIG_BCM63XX_PHY) += bcm63xx.o
obj-$(CONFIG_BCM7XXX_PHY) += bcm7xxx.o
diff --git a/drivers/net/phy/asix.c b/drivers/net/phy/asix.c
new file mode 100644
index 0000000..8ebe7f5
--- /dev/null
+++ b/drivers/net/phy/asix.c
@@ -0,0 +1,63 @@
+// SPDX-License-Identifier: GPL-2.0
+/* Driver for Asix PHYs
+ *
+ * Author: Michael Schmitz <schmitzmic@xxxxxxxxx>
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License as published by the
+ * Free Software Foundation; either version 2 of the License, or (at your
+ * option) any later version.
+ *
+ */
+#include <linux/kernel.h>
+#include <linux/errno.h>
+#include <linux/init.h>
+#include <linux/module.h>
+#include <linux/mii.h>
+#include <linux/phy.h>
+
+#define PHY_ID_ASIX_AX88796B 0x003b1841
+
+MODULE_DESCRIPTION("Asix PHY driver");
+MODULE_AUTHOR("Michael Schmitz <schmitzmic@xxxxxxxxx>");
+MODULE_LICENSE("GPL");
+
+/**
+ * asix_soft_reset - software reset the PHY via BMCR_RESET bit
+ * @phydev: target phy_device struct
+ *
+ * Description: Perform a software PHY reset using the standard
+ * BMCR_RESET bit and poll for the reset bit to be cleared.
+ * Toggle BMCR_RESET bit off to accommodate broken AX8796B PHY implementation
+ * such as used on the Individual Computers' X-Surf 100 Zorro card.
+ *
+ * Returns: 0 on success, < 0 on failure
+ */
+static int asix_soft_reset(struct phy_device *phydev)
+{
+ int ret;
+
+ /* Asix PHY won't reset unless reset bit toggles */
+ ret = phy_write(phydev, MII_BMCR, 0);
+ if (ret < 0)
+ return ret;
+
+ return genphy_soft_reset(phydev);
+}
+
+static struct phy_driver asix_driver[] = { {
+ .phy_id = PHY_ID_ASIX_AX88796B,
+ .name = "Asix Electronics AX88796B",
+ .phy_id_mask = 0xfffffff0,
+ .features = PHY_BASIC_FEATURES,
+ .soft_reset = asix_soft_reset,
+} };
+
+module_phy_driver(asix_driver);
+
+static struct mdio_device_id __maybe_unused asix_tbl[] = {
+ { PHY_ID_ASIX_AX88796B, 0xfffffff0 },
+ { }
+};
+
+MODULE_DEVICE_TABLE(mdio, asix_tbl);
--
1.7.0.4
--
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