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>
2007-08-22 20:56:01 -07:00
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/*
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* drivers/net/ibm_newemac/mal.h
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*
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* Memory Access Layer (MAL) support
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*
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* Copyright (c) 2004, 2005 Zultys Technologies.
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* Eugene Surovegin <eugene.surovegin@zultys.com> or <ebs@ebshome.net>
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*
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* Based on original work by
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* Armin Kuster <akuster@mvista.com>
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* Copyright 2002 MontaVista Softare Inc.
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License as published by the
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* Free Software Foundation; either version 2 of the License, or (at your
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* option) any later version.
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*
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*/
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#ifndef __IBM_NEWEMAC_MAL_H
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#define __IBM_NEWEMAC_MAL_H
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/*
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* There are some variations on the MAL, we express them in this driver as
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* MAL Version 1 and 2 though that doesn't match any IBM terminology.
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*
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* We call MAL 1 the version in 405GP, 405GPR, 405EP, 440EP, 440GR and
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* NP405H.
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*
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* We call MAL 2 the version in 440GP, 440GX, 440SP, 440SPE and Axon
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*
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* The driver expects a "version" property in the emac node containing
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* a number 1 or 2. New device-trees for EMAC capable platforms are thus
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* required to include that when porting to arch/powerpc.
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*/
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/* MALx DCR registers */
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#define MAL_CFG 0x00
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#define MAL_CFG_SR 0x80000000
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#define MAL_CFG_PLBB 0x00004000
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#define MAL_CFG_OPBBL 0x00000080
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#define MAL_CFG_EOPIE 0x00000004
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#define MAL_CFG_LEA 0x00000002
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#define MAL_CFG_SD 0x00000001
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/* MAL V1 CFG bits */
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#define MAL1_CFG_PLBP_MASK 0x00c00000
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#define MAL1_CFG_PLBP_10 0x00800000
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#define MAL1_CFG_GA 0x00200000
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#define MAL1_CFG_OA 0x00100000
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#define MAL1_CFG_PLBLE 0x00080000
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#define MAL1_CFG_PLBT_MASK 0x00078000
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#define MAL1_CFG_DEFAULT (MAL1_CFG_PLBP_10 | MAL1_CFG_PLBT_MASK)
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/* MAL V2 CFG bits */
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#define MAL2_CFG_RPP_MASK 0x00c00000
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#define MAL2_CFG_RPP_10 0x00800000
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#define MAL2_CFG_RMBS_MASK 0x00300000
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#define MAL2_CFG_WPP_MASK 0x000c0000
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#define MAL2_CFG_WPP_10 0x00080000
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#define MAL2_CFG_WMBS_MASK 0x00030000
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#define MAL2_CFG_PLBLE 0x00008000
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#define MAL2_CFG_DEFAULT (MAL2_CFG_RMBS_MASK | MAL2_CFG_WMBS_MASK | \
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MAL2_CFG_RPP_10 | MAL2_CFG_WPP_10)
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#define MAL_ESR 0x01
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#define MAL_ESR_EVB 0x80000000
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#define MAL_ESR_CIDT 0x40000000
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#define MAL_ESR_CID_MASK 0x3e000000
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#define MAL_ESR_CID_SHIFT 25
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#define MAL_ESR_DE 0x00100000
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#define MAL_ESR_OTE 0x00040000
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#define MAL_ESR_OSE 0x00020000
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#define MAL_ESR_PEIN 0x00010000
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#define MAL_ESR_DEI 0x00000010
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#define MAL_ESR_OTEI 0x00000004
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#define MAL_ESR_OSEI 0x00000002
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#define MAL_ESR_PBEI 0x00000001
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/* MAL V1 ESR bits */
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#define MAL1_ESR_ONE 0x00080000
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#define MAL1_ESR_ONEI 0x00000008
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/* MAL V2 ESR bits */
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#define MAL2_ESR_PTE 0x00800000
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#define MAL2_ESR_PRE 0x00400000
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#define MAL2_ESR_PWE 0x00200000
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#define MAL2_ESR_PTEI 0x00000080
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#define MAL2_ESR_PREI 0x00000040
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#define MAL2_ESR_PWEI 0x00000020
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#define MAL_IER 0x02
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#define MAL_IER_DE 0x00000010
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#define MAL_IER_OTE 0x00000004
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#define MAL_IER_OE 0x00000002
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#define MAL_IER_PE 0x00000001
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/* MAL V1 IER bits */
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#define MAL1_IER_NWE 0x00000008
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#define MAL1_IER_SOC_EVENTS MAL1_IER_NWE
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#define MAL1_IER_EVENTS (MAL1_IER_SOC_EVENTS | MAL_IER_OTE | \
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MAL_IER_OTE | MAL_IER_OE | MAL_IER_PE)
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/* MAL V2 IER bits */
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#define MAL2_IER_PT 0x00000080
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#define MAL2_IER_PRE 0x00000040
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#define MAL2_IER_PWE 0x00000020
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#define MAL2_IER_SOC_EVENTS (MAL2_IER_PT | MAL2_IER_PRE | MAL2_IER_PWE)
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#define MAL2_IER_EVENTS (MAL2_IER_SOC_EVENTS | MAL_IER_OTE | \
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MAL_IER_OTE | MAL_IER_OE | MAL_IER_PE)
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#define MAL_TXCASR 0x04
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#define MAL_TXCARR 0x05
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#define MAL_TXEOBISR 0x06
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#define MAL_TXDEIR 0x07
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#define MAL_RXCASR 0x10
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#define MAL_RXCARR 0x11
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#define MAL_RXEOBISR 0x12
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#define MAL_RXDEIR 0x13
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#define MAL_TXCTPR(n) ((n) + 0x20)
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#define MAL_RXCTPR(n) ((n) + 0x40)
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#define MAL_RCBS(n) ((n) + 0x60)
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/* In reality MAL can handle TX buffers up to 4095 bytes long,
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* but this isn't a good round number :) --ebs
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*/
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#define MAL_MAX_TX_SIZE 4080
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#define MAL_MAX_RX_SIZE 4080
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static inline int mal_rx_size(int len)
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{
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len = (len + 0xf) & ~0xf;
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return len > MAL_MAX_RX_SIZE ? MAL_MAX_RX_SIZE : len;
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}
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static inline int mal_tx_chunks(int len)
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{
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return (len + MAL_MAX_TX_SIZE - 1) / MAL_MAX_TX_SIZE;
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}
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#define MAL_CHAN_MASK(n) (0x80000000 >> (n))
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/* MAL Buffer Descriptor structure */
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struct mal_descriptor {
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u16 ctrl; /* MAL / Commac status control bits */
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u16 data_len; /* Max length is 4K-1 (12 bits) */
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u32 data_ptr; /* pointer to actual data buffer */
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};
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/* the following defines are for the MadMAL status and control registers. */
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/* MADMAL transmit and receive status/control bits */
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#define MAL_RX_CTRL_EMPTY 0x8000
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#define MAL_RX_CTRL_WRAP 0x4000
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#define MAL_RX_CTRL_CM 0x2000
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#define MAL_RX_CTRL_LAST 0x1000
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#define MAL_RX_CTRL_FIRST 0x0800
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#define MAL_RX_CTRL_INTR 0x0400
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#define MAL_RX_CTRL_SINGLE (MAL_RX_CTRL_LAST | MAL_RX_CTRL_FIRST)
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#define MAL_IS_SINGLE_RX(ctrl) (((ctrl) & MAL_RX_CTRL_SINGLE) == MAL_RX_CTRL_SINGLE)
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#define MAL_TX_CTRL_READY 0x8000
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#define MAL_TX_CTRL_WRAP 0x4000
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#define MAL_TX_CTRL_CM 0x2000
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#define MAL_TX_CTRL_LAST 0x1000
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#define MAL_TX_CTRL_INTR 0x0400
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struct mal_commac_ops {
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void (*poll_tx) (void *dev);
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int (*poll_rx) (void *dev, int budget);
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int (*peek_rx) (void *dev);
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void (*rxde) (void *dev);
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};
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struct mal_commac {
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struct mal_commac_ops *ops;
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void *dev;
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struct list_head poll_list;
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long flags;
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#define MAL_COMMAC_RX_STOPPED 0
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#define MAL_COMMAC_POLL_DISABLED 1
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u32 tx_chan_mask;
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u32 rx_chan_mask;
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struct list_head list;
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};
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struct mal_instance {
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int version;
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int dcr_base;
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dcr_host_t dcr_host;
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int num_tx_chans; /* Number of TX channels */
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int num_rx_chans; /* Number of RX channels */
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int txeob_irq; /* TX End Of Buffer IRQ */
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int rxeob_irq; /* RX End Of Buffer IRQ */
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int txde_irq; /* TX Descriptor Error IRQ */
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int rxde_irq; /* RX Descriptor Error IRQ */
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int serr_irq; /* MAL System Error IRQ */
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struct list_head poll_list;
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2007-10-09 15:48:56 -07:00
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struct napi_struct napi;
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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>
2007-08-22 20:56:01 -07:00
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struct list_head list;
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u32 tx_chan_mask;
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u32 rx_chan_mask;
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dma_addr_t bd_dma;
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struct mal_descriptor *bd_virt;
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struct of_device *ofdev;
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int index;
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spinlock_t lock;
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};
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static inline u32 get_mal_dcrn(struct mal_instance *mal, int reg)
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{
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return dcr_read(mal->dcr_host, mal->dcr_base + reg);
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}
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static inline void set_mal_dcrn(struct mal_instance *mal, int reg, u32 val)
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{
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dcr_write(mal->dcr_host, mal->dcr_base + reg, val);
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}
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/* Register MAL devices */
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int mal_init(void);
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void mal_exit(void);
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int mal_register_commac(struct mal_instance *mal,
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struct mal_commac *commac);
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void mal_unregister_commac(struct mal_instance *mal,
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struct mal_commac *commac);
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int mal_set_rcbs(struct mal_instance *mal, int channel, unsigned long size);
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/* Returns BD ring offset for a particular channel
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(in 'struct mal_descriptor' elements)
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*/
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int mal_tx_bd_offset(struct mal_instance *mal, int channel);
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int mal_rx_bd_offset(struct mal_instance *mal, int channel);
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void mal_enable_tx_channel(struct mal_instance *mal, int channel);
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void mal_disable_tx_channel(struct mal_instance *mal, int channel);
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void mal_enable_rx_channel(struct mal_instance *mal, int channel);
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void mal_disable_rx_channel(struct mal_instance *mal, int channel);
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void mal_poll_disable(struct mal_instance *mal, struct mal_commac *commac);
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void mal_poll_enable(struct mal_instance *mal, struct mal_commac *commac);
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/* Add/remove EMAC to/from MAL polling list */
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void mal_poll_add(struct mal_instance *mal, struct mal_commac *commac);
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void mal_poll_del(struct mal_instance *mal, struct mal_commac *commac);
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/* Ethtool MAL registers */
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struct mal_regs {
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u32 tx_count;
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u32 rx_count;
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u32 cfg;
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u32 esr;
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u32 ier;
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u32 tx_casr;
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u32 tx_carr;
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u32 tx_eobisr;
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u32 tx_deir;
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u32 rx_casr;
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u32 rx_carr;
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u32 rx_eobisr;
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u32 rx_deir;
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u32 tx_ctpr[32];
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u32 rx_ctpr[32];
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u32 rcbs[32];
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};
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int mal_get_regs_len(struct mal_instance *mal);
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void *mal_dump_regs(struct mal_instance *mal, void *buf);
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#endif /* __IBM_NEWEMAC_MAL_H */
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