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[mii] Add mii_find()

Add the function mii_find() in order to locate the PHY address.

Signed-off-by: Sylvie Barlow <sylvie.c.barlow@gmail.com>
Signed-off-by: Michael Brown <mcb30@ipxe.org>
tags/v1.20.1
Sylvie Barlow 6 年前
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共有 2 个文件被更改,包括 29 次插入0 次删除
  1. 25
    0
      src/drivers/net/mii.c
  2. 4
    0
      src/include/ipxe/mii.h

+ 25
- 0
src/drivers/net/mii.c 查看文件

@@ -147,3 +147,28 @@ int mii_check_link ( struct mii_device *mii, struct net_device *netdev ) {
147 147
 
148 148
 	return 0;
149 149
 }
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+
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+/**
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+ * Find PHY address
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+ *
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+ * @v mii		MII device
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+ * @ret rc		Return status code
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+ */
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+int mii_find ( struct mii_device *mii ) {
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+	unsigned int address;
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+	int id;
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+
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+	/* Try all possible PHY addresses */
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+	for ( address = 0 ; address <= MII_MAX_PHY_ADDRESS ; address++ ) {
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+		mii->address = address;
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+		id = mii_read ( mii, MII_PHYSID1 );
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+		if ( ( id > 0x0000 ) && ( id < 0xffff ) ) {
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+			DBGC ( mii, "MII %p found PHY at address %d\n",
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+			       mii, address );
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+			return 0;
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+		}
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+	}
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+
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+	DBGC ( mii, "MII %p failed to find an address\n", mii );
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+	return -ENOENT;
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+}

+ 4
- 0
src/include/ipxe/mii.h 查看文件

@@ -141,9 +141,13 @@ mii_dump ( struct mii_device *mii ) {
141 141
 /** Maximum time to wait for a reset, in milliseconds */
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 #define MII_RESET_MAX_WAIT_MS 500
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+/** Maximum PHY address */
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+#define MII_MAX_PHY_ADDRESS 31
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+
144 147
 extern int mii_restart ( struct mii_device *mii );
145 148
 extern int mii_reset ( struct mii_device *mii );
146 149
 extern int mii_check_link ( struct mii_device *mii,
147 150
 			    struct net_device *netdev );
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+extern int mii_find ( struct mii_device *mii );
148 152
 
149 153
 #endif /* _IPXE_MII_H */

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