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>

1 files changed, 76 insertions, 0 deletions

diff --git a/drivers/net/ibm_newemac/rgmii.h b/drivers/net/ibm_newemac/rgmii.h
new file mode 100644
index 00000000000..57806833121
--- /dev/null
+++ b/drivers/net/ibm_newemac/rgmii.h
@@ -0,0 +1,76 @@
+/*
+ * drivers/net/ibm_newemac/rgmii.h
+ *
+ * Driver for PowerPC 4xx on-chip ethernet controller, RGMII bridge support.
+ *
+ * Based on ocp_zmii.h/ibm_emac_zmii.h
+ * Armin Kuster akuster@mvista.com
+ *
+ * Copyright 2004 MontaVista Software, Inc.
+ * Matt Porter <mporter@kernel.crashing.org>
+ *
+ * Copyright (c) 2004, 2005 Zultys Technologies.
+ * Eugene Surovegin <eugene.surovegin@zultys.com> or <ebs@ebshome.net>
+ *
+ * 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_RGMII_H
+#define __IBM_NEWEMAC_RGMII_H
+
+/* RGMII bridge type */
+#define RGMII_STANDARD		0
+#define RGMII_AXON		1
+
+/* RGMII bridge */
+struct rgmii_regs {
+	u32 fer;		/* Function enable register */
+	u32 ssr;		/* Speed select register */
+};
+
+/* RGMII device */
+struct rgmii_instance {
+	struct rgmii_regs __iomem	*base;
+
+	/* Type of RGMII bridge */
+	int				type;
+
+	/* Only one EMAC whacks us at a time */
+	struct mutex			lock;
+
+	/* number of EMACs using this RGMII bridge */
+	int				users;
+
+	/* OF device instance */
+	struct of_device		*ofdev;
+};
+
+#ifdef CONFIG_IBM_NEW_EMAC_RGMII
+
+extern int rgmii_init(void);
+extern void rgmii_exit(void);
+extern int rgmii_attach(struct of_device *ofdev, int input, int mode);
+extern void rgmii_detach(struct of_device *ofdev, int input);
+extern void rgmii_get_mdio(struct of_device *ofdev, int input);
+extern void rgmii_put_mdio(struct of_device *ofdev, int input);
+extern void rgmii_set_speed(struct of_device *ofdev, int input, int speed);
+extern int rgmii_get_regs_len(struct of_device *ofdev);
+extern void *rgmii_dump_regs(struct of_device *ofdev, void *buf);
+
+#else
+
+# define rgmii_init()		0
+# define rgmii_exit()		do { } while(0)
+# define rgmii_attach(x,y,z)	(-ENXIO)
+# define rgmii_detach(x,y)	do { } while(0)
+# define rgmii_get_mdio(o,i)	do { } while (0)
+# define rgmii_put_mdio(o,i)	do { } while (0)
+# define rgmii_set_speed(x,y,z)	do { } while(0)
+# define rgmii_get_regs_len(x)	0
+# define rgmii_dump_regs(x,buf)	(buf)
+#endif				/* !CONFIG_IBM_NEW_EMAC_RGMII */
+
+#endif /* __IBM_NEWEMAC_RGMII_H */