Device tree aware EMAC driver
Based on BenH's earlier work, this is a new version of the EMAC driver
for the built-in ethernet found on PowerPC 4xx embedded CPUs. The
same ASIC is also found in the Axon bridge chip. This new version is
designed to work in the arch/powerpc tree, using the device tree to
probe the device, rather than the old and ugly arch/ppc OCP layer.
This driver is designed to sit alongside the old driver (that lies in
drivers/net/ibm_emac and this one in drivers/net/ibm_newemac). The
old driver is left in place to support arch/ppc until arch/ppc itself
reaches its final demise (not too long now, with luck).
This driver still has a number of things that could do with cleaning
up, but I think they can be fixed up after merging. Specifically:
- Should be adjusted to properly use the dma mapping API.
Axon needs this.
- Probe logic needs reworking, in conjuction with the general
probing code for of_platform devices. The dependencies here between
EMAC, MAL, ZMII etc. make this complicated. At present, it usually
works, because we initialize and register the sub-drivers before the
EMAC driver itself, and (being in driver code) runs after the devices
themselves have been instantiated from the device tree.
Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
Signed-off-by: Jeff Garzik <jeff@garzik.org>
diff --git a/drivers/net/ibm_newemac/zmii.h b/drivers/net/ibm_newemac/zmii.h
new file mode 100644
index 0000000..82a9968
--- /dev/null
+++ b/drivers/net/ibm_newemac/zmii.h
@@ -0,0 +1,73 @@
+/*
+ * drivers/net/ibm_newemac/zmii.h
+ *
+ * Driver for PowerPC 4xx on-chip ethernet controller, ZMII bridge support.
+ *
+ * Copyright (c) 2004, 2005 Zultys Technologies.
+ * Eugene Surovegin <eugene.surovegin@zultys.com> or <ebs@ebshome.net>
+ *
+ * Based on original work by
+ * Armin Kuster <akuster@mvista.com>
+ * Copyright 2001 MontaVista Softare Inc.
+ *
+ * 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.
+ *
+ */
+#ifndef __IBM_NEWEMAC_ZMII_H
+#define __IBM_NEWEMAC_ZMII_H
+
+/* ZMII bridge registers */
+struct zmii_regs {
+ u32 fer; /* Function enable reg */
+ u32 ssr; /* Speed select reg */
+ u32 smiirs; /* SMII status reg */
+};
+
+/* ZMII device */
+struct zmii_instance {
+ struct zmii_regs __iomem *base;
+
+ /* Only one EMAC whacks us at a time */
+ struct mutex lock;
+
+ /* subset of PHY_MODE_XXXX */
+ int mode;
+
+ /* number of EMACs using this ZMII bridge */
+ int users;
+
+ /* FER value left by firmware */
+ u32 fer_save;
+
+ /* OF device instance */
+ struct of_device *ofdev;
+};
+
+#ifdef CONFIG_IBM_NEW_EMAC_ZMII
+
+extern int zmii_init(void);
+extern void zmii_exit(void);
+extern int zmii_attach(struct of_device *ofdev, int input, int *mode);
+extern void zmii_detach(struct of_device *ofdev, int input);
+extern void zmii_get_mdio(struct of_device *ofdev, int input);
+extern void zmii_put_mdio(struct of_device *ofdev, int input);
+extern void zmii_set_speed(struct of_device *ofdev, int input, int speed);
+extern int zmii_get_regs_len(struct of_device *ocpdev);
+extern void *zmii_dump_regs(struct of_device *ofdev, void *buf);
+
+#else
+# define zmii_init() 0
+# define zmii_exit() do { } while(0)
+# define zmii_attach(x,y,z) (-ENXIO)
+# define zmii_detach(x,y) do { } while(0)
+# define zmii_get_mdio(x,y) do { } while(0)
+# define zmii_put_mdio(x,y) do { } while(0)
+# define zmii_set_speed(x,y,z) do { } while(0)
+# define zmii_get_regs_len(x) 0
+# define zmii_dump_regs(x,buf) (buf)
+#endif /* !CONFIG_IBM_NEW_EMAC_ZMII */
+
+#endif /* __IBM_NEWEMAC_ZMII_H */