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>
2007-08-23 07:56:01 +04:00
/*
* drivers / net / ibm_newemac / tah . h
*
* Driver for PowerPC 4 xx on - chip ethernet controller , TAH support .
*
2007-12-05 03:14:33 +03:00
* Copyright 2007 Benjamin Herrenschmidt , IBM Corp .
* < benh @ kernel . crashing . org >
*
* Based on the arch / ppc version of the driver :
*
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>
2007-08-23 07:56:01 +04:00
* Copyright 2004 MontaVista Software , Inc .
* Matt Porter < mporter @ kernel . crashing . org >
*
* Copyright ( c ) 2005 Eugene Surovegin < 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_TAH_H
# define __IBM_NEWEMAC_TAH_H
/* TAH */
struct tah_regs {
u32 revid ;
u32 pad [ 3 ] ;
u32 mr ;
u32 ssr0 ;
u32 ssr1 ;
u32 ssr2 ;
u32 ssr3 ;
u32 ssr4 ;
u32 ssr5 ;
u32 tsr ;
} ;
/* TAH device */
struct tah_instance {
struct tah_regs __iomem * base ;
/* Only one EMAC whacks us at a time */
struct mutex lock ;
/* number of EMACs using this TAH */
int users ;
/* OF device instance */
struct of_device * ofdev ;
} ;
/* TAH engine */
# define TAH_MR_CVR 0x80000000
# define TAH_MR_SR 0x40000000
# define TAH_MR_ST_256 0x01000000
# define TAH_MR_ST_512 0x02000000
# define TAH_MR_ST_768 0x03000000
# define TAH_MR_ST_1024 0x04000000
# define TAH_MR_ST_1280 0x05000000
# define TAH_MR_ST_1536 0x06000000
# define TAH_MR_TFS_16KB 0x00000000
# define TAH_MR_TFS_2KB 0x00200000
# define TAH_MR_TFS_4KB 0x00400000
# define TAH_MR_TFS_6KB 0x00600000
# define TAH_MR_TFS_8KB 0x00800000
# define TAH_MR_TFS_10KB 0x00a00000
# define TAH_MR_DTFP 0x00100000
# define TAH_MR_DIG 0x00080000
# ifdef CONFIG_IBM_NEW_EMAC_TAH
extern int tah_init ( void ) ;
extern void tah_exit ( void ) ;
extern int tah_attach ( struct of_device * ofdev , int channel ) ;
extern void tah_detach ( struct of_device * ofdev , int channel ) ;
extern void tah_reset ( struct of_device * ofdev ) ;
extern int tah_get_regs_len ( struct of_device * ofdev ) ;
extern void * tah_dump_regs ( struct of_device * ofdev , void * buf ) ;
# else
# define tah_init() 0
# define tah_exit() do { } while(0)
# define tah_attach(x,y) (-ENXIO)
# define tah_detach(x,y) do { } while(0)
# define tah_reset(x) do { } while(0)
# define tah_get_regs_len(x) 0
# define tah_dump_regs(x,buf) (buf)
# endif /* !CONFIG_IBM_NEW_EMAC_TAH */
# endif /* __IBM_NEWEMAC_TAH_H */
