[mii] Add generic MII reset function

iPXE provides no support for manually configuring the link speed.
Provide a generic routine which should be able to reset any MII/GMII
PHY and enable autonegotiation.

Prototyped-by: Thomas Miletich <thomas.miletich@gmail.com>
Signed-off-by: Michael Brown <mcb30@ipxe.org>

1 files changed, 86 insertions, 0 deletions

diff --git a/src/include/ipxe/mii.h b/src/include/ipxe/mii.h
new file mode 100644
index 00000000..a33a31d9
--- /dev/null
+++ b/src/include/ipxe/mii.h
@@ -0,0 +1,86 @@
+#ifndef _IPXE_MII_H
+#define _IPXE_MII_H
+
+/** @file
+ *
+ * Media Independent Interface
+ *
+ */
+
+FILE_LICENCE ( GPL2_OR_LATER );
+
+#include <mii.h>
+#include <ipxe/netdevice.h>
+
+struct mii_interface;
+
+/** MII interface operations */
+struct mii_operations {
+	/**
+	 * Read from MII register
+	 *
+	 * @v mii		MII interface
+	 * @v reg		Register address
+	 * @ret data		Data read, or negative error
+	 */
+	int ( * read ) ( struct mii_interface *mii, unsigned int reg );
+	/**
+	 * Write to MII register
+	 *
+	 * @v mii		MII interface
+	 * @v reg		Register address
+	 * @v data		Data to write
+	 * @ret rc		Return status code
+	 */
+	int ( * write ) ( struct mii_interface *mii, unsigned int reg,
+			  unsigned int data );
+};
+
+/** An MII interface */
+struct mii_interface {
+	/** Interface operations */
+	struct mii_operations *op;
+};
+
+/**
+ * Initialise MII interface
+ *
+ * @v mii		MII interface
+ * @v op		MII interface operations
+ */
+static inline __attribute__ (( always_inline )) void
+mii_init ( struct mii_interface *mii, struct mii_operations *op ) {
+	mii->op = op;
+}
+
+/**
+ * Read from MII register
+ *
+ * @v mii		MII interface
+ * @v reg		Register address
+ * @ret data		Data read, or negative error
+ */
+static inline __attribute__ (( always_inline )) int
+mii_read ( struct mii_interface *mii, unsigned int reg ) {
+	return mii->op->read ( mii, reg );
+}
+
+/**
+ * Write to MII register
+ *
+ * @v mii		MII interface
+ * @v reg		Register address
+ * @v data		Data to write
+ * @ret rc		Return status code
+ */
+static inline __attribute__ (( always_inline )) int
+mii_write ( struct mii_interface *mii, unsigned int reg, unsigned int data ) {
+	return mii->op->write ( mii, reg, data );
+}
+
+/** Maximum time to wait for a reset, in milliseconds */
+#define MII_RESET_MAX_WAIT_MS 500
+
+extern int mii_reset ( struct mii_interface *mii );
+
+#endif /* _IPXE_MII_H */