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authorScott Wood <scottwood@freescale.com>2007-10-01 14:20:56 -0500
committerDavid S. Miller <davem@sunset.davemloft.net>2007-10-10 16:54:03 -0700
commite2ec4581adf7e288c193e981c39ca01cdb20a272 (patch)
tree354c0afb64104457d2690e656f2d7ae883ff5722 /include
parent976de6a8c304dcc43e38efcb8a0bace7866b6242 (diff)
downloadop-kernel-dev-e2ec4581adf7e288c193e981c39ca01cdb20a272.zip
op-kernel-dev-e2ec4581adf7e288c193e981c39ca01cdb20a272.tar.gz
Generic bitbanged MDIO library
Previously, bitbanged MDIO was only supported in individual hardware-specific drivers. This code factors out the higher level protocol implementation, reducing the hardware-specific portion to functions setting direction, data, and clock. Signed-off-by: Scott Wood <scottwood@freescale.com> Signed-off-by: Jeff Garzik <jeff@garzik.org>
Diffstat (limited to 'include')
-rw-r--r--include/linux/mdio-bitbang.h42
1 files changed, 42 insertions, 0 deletions
diff --git a/include/linux/mdio-bitbang.h b/include/linux/mdio-bitbang.h
new file mode 100644
index 0000000..8ea9a42
--- /dev/null
+++ b/include/linux/mdio-bitbang.h
@@ -0,0 +1,42 @@
+#ifndef __LINUX_MDIO_BITBANG_H
+#define __LINUX_MDIO_BITBANG_H
+
+#include <linux/phy.h>
+#include <linux/module.h>
+
+struct mdiobb_ctrl;
+
+struct mdiobb_ops {
+ struct module *owner;
+
+ /* Set the Management Data Clock high if level is one,
+ * low if level is zero.
+ */
+ void (*set_mdc)(struct mdiobb_ctrl *ctrl, int level);
+
+ /* Configure the Management Data I/O pin as an input if
+ * "output" is zero, or an output if "output" is one.
+ */
+ void (*set_mdio_dir)(struct mdiobb_ctrl *ctrl, int output);
+
+ /* Set the Management Data I/O pin high if value is one,
+ * low if "value" is zero. This may only be called
+ * when the MDIO pin is configured as an output.
+ */
+ void (*set_mdio_data)(struct mdiobb_ctrl *ctrl, int value);
+
+ /* Retrieve the state Management Data I/O pin. */
+ int (*get_mdio_data)(struct mdiobb_ctrl *ctrl);
+};
+
+struct mdiobb_ctrl {
+ const struct mdiobb_ops *ops;
+};
+
+/* The returned bus is not yet registered with the phy layer. */
+struct mii_bus *alloc_mdio_bitbang(struct mdiobb_ctrl *ctrl);
+
+/* The bus must already have been unregistered. */
+void free_mdio_bitbang(struct mii_bus *bus);
+
+#endif
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