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linux/drivers/net/ethernet/ibm/emac/core.h
Christophe Jaillet 138b57f0f8 net: ibm: emac: Fix some error handling path in 'emac_probe()' 
If 'irq_of_parse_and_map()' or 'of_address_to_resource()' fail, 'err' is
known to be 0 at this point.
So return -ENODEV instead in the first case and use 'of_iomap()' instead of
the equivalent 'of_address_to_resource()/ioremap()' combinaison in the 2nd
case.

Doing so, the 'rsrc_regs' field of the 'emac_instance struct' becomes
redundant and is removed.

While at it, turn a 'err != 0' test into an equivalent 'err' to be more
consistent.

Signed-off-by: Christophe JAILLET <christophe.jaillet@wanadoo.fr>
Signed-off-by: David S. Miller <davem@davemloft.net>
2017-08-20 19:53:08 -07:00

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/*
* drivers/net/ethernet/ibm/emac/core.h
*
* Driver for PowerPC 4xx on-chip ethernet controller.
*
* Copyright 2007 Benjamin Herrenschmidt, IBM Corp.
* <benh@kernel.crashing.org>
*
* Based on the arch/ppc version of the driver:
*
* 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>
* Johnnie Peters <jpeters@mvista.com>
* Copyright 2000, 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_CORE_H
#define __IBM_NEWEMAC_CORE_H
#include <linux/module.h>
#include <linux/list.h>
#include <linux/kernel.h>
#include <linux/interrupt.h>
#include <linux/netdevice.h>
#include <linux/dma-mapping.h>
#include <linux/spinlock.h>
#include <linux/of_platform.h>
#include <linux/slab.h>
#include <asm/io.h>
#include <asm/dcr.h>
#include "emac.h"
#include "phy.h"
#include "zmii.h"
#include "rgmii.h"
#include "mal.h"
#include "tah.h"
#include "debug.h"
#define NUM_TX_BUFF CONFIG_IBM_EMAC_TXB
#define NUM_RX_BUFF CONFIG_IBM_EMAC_RXB
/* Simple sanity check */
#if NUM_TX_BUFF > 256 || NUM_RX_BUFF > 256
#error Invalid number of buffer descriptors (greater than 256)
#endif
#define EMAC_MIN_MTU 46
/* Maximum L2 header length (VLAN tagged, no FCS) */
#define EMAC_MTU_OVERHEAD (6 * 2 + 2 + 4)
/* RX BD size for the given MTU */
static inline int emac_rx_size(int mtu)
{
if (mtu > ETH_DATA_LEN)
return MAL_MAX_RX_SIZE;
else
return mal_rx_size(ETH_DATA_LEN + EMAC_MTU_OVERHEAD);
}
#define EMAC_DMA_ALIGN(x) ALIGN((x), dma_get_cache_alignment())
#define EMAC_RX_SKB_HEADROOM \
EMAC_DMA_ALIGN(CONFIG_IBM_EMAC_RX_SKB_HEADROOM)
/* Size of RX skb for the given MTU */
static inline int emac_rx_skb_size(int mtu)
{
int size = max(mtu + EMAC_MTU_OVERHEAD, emac_rx_size(mtu));
return EMAC_DMA_ALIGN(size + 2) + EMAC_RX_SKB_HEADROOM;
}
/* RX DMA sync size */
static inline int emac_rx_sync_size(int mtu)
{
return EMAC_DMA_ALIGN(emac_rx_size(mtu) + 2);
}
/* Driver statistcs is split into two parts to make it more cache friendly:
* - normal statistics (packet count, etc)
* - error statistics
*
* When statistics is requested by ethtool, these parts are concatenated,
* normal one goes first.
*
* Please, keep these structures in sync with emac_stats_keys.
*/
/* Normal TX/RX Statistics */
struct emac_stats {
u64 rx_packets;
u64 rx_bytes;
u64 tx_packets;
u64 tx_bytes;
u64 rx_packets_csum;
u64 tx_packets_csum;
};
/* Error statistics */
struct emac_error_stats {
u64 tx_undo;
/* Software RX Errors */
u64 rx_dropped_stack;
u64 rx_dropped_oom;
u64 rx_dropped_error;
u64 rx_dropped_resize;
u64 rx_dropped_mtu;
u64 rx_stopped;
/* BD reported RX errors */
u64 rx_bd_errors;
u64 rx_bd_overrun;
u64 rx_bd_bad_packet;
u64 rx_bd_runt_packet;
u64 rx_bd_short_event;
u64 rx_bd_alignment_error;
u64 rx_bd_bad_fcs;
u64 rx_bd_packet_too_long;
u64 rx_bd_out_of_range;
u64 rx_bd_in_range;
/* EMAC IRQ reported RX errors */
u64 rx_parity;
u64 rx_fifo_overrun;
u64 rx_overrun;
u64 rx_bad_packet;
u64 rx_runt_packet;
u64 rx_short_event;
u64 rx_alignment_error;
u64 rx_bad_fcs;
u64 rx_packet_too_long;
u64 rx_out_of_range;
u64 rx_in_range;
/* Software TX Errors */
u64 tx_dropped;
/* BD reported TX errors */
u64 tx_bd_errors;
u64 tx_bd_bad_fcs;
u64 tx_bd_carrier_loss;
u64 tx_bd_excessive_deferral;
u64 tx_bd_excessive_collisions;
u64 tx_bd_late_collision;
u64 tx_bd_multple_collisions;
u64 tx_bd_single_collision;
u64 tx_bd_underrun;
u64 tx_bd_sqe;
/* EMAC IRQ reported TX errors */
u64 tx_parity;
u64 tx_underrun;
u64 tx_sqe;
u64 tx_errors;
};
#define EMAC_ETHTOOL_STATS_COUNT ((sizeof(struct emac_stats) + \
sizeof(struct emac_error_stats)) \
/ sizeof(u64))
struct emac_instance {
struct net_device *ndev;
struct emac_regs __iomem *emacp;
struct platform_device *ofdev;
struct device_node **blist; /* bootlist entry */
/* MAL linkage */
u32 mal_ph;
struct platform_device *mal_dev;
u32 mal_rx_chan;
u32 mal_tx_chan;
struct mal_instance *mal;
struct mal_commac commac;
/* PHY infos */
int phy_mode;
u32 phy_map;
u32 phy_address;
u32 phy_feat_exc;
struct mii_phy phy;
struct mutex link_lock;
struct delayed_work link_work;
int link_polling;
/* GPCS PHY infos */
u32 gpcs_address;
/* Shared MDIO if any */
u32 mdio_ph;
struct platform_device *mdio_dev;
struct emac_instance *mdio_instance;
struct mutex mdio_lock;
/* Device-tree based phy configuration */
struct mii_bus *mii_bus;
struct phy_device *phy_dev;
/* ZMII infos if any */
u32 zmii_ph;
u32 zmii_port;
struct platform_device *zmii_dev;
/* RGMII infos if any */
u32 rgmii_ph;
u32 rgmii_port;
struct platform_device *rgmii_dev;
/* TAH infos if any */
u32 tah_ph;
u32 tah_port;
struct platform_device *tah_dev;
/* IRQs */
int wol_irq;
int emac_irq;
/* OPB bus frequency in Mhz */
u32 opb_bus_freq;
/* Cell index within an ASIC (for clk mgmnt) */
u32 cell_index;
/* Max supported MTU */
u32 max_mtu;
/* Feature bits (from probe table) */
unsigned int features;
/* Tx and Rx fifo sizes & other infos in bytes */
u32 tx_fifo_size;
u32 tx_fifo_size_gige;
u32 rx_fifo_size;
u32 rx_fifo_size_gige;
u32 fifo_entry_size;
u32 mal_burst_size; /* move to MAL ? */
/* IAHT and GAHT filter parameterization */
u32 xaht_slots_shift;
u32 xaht_width_shift;
/* Descriptor management
*/
struct mal_descriptor *tx_desc;
int tx_cnt;
int tx_slot;
int ack_slot;
struct mal_descriptor *rx_desc;
int rx_slot;
struct sk_buff *rx_sg_skb; /* 1 */
int rx_skb_size;
int rx_sync_size;
struct sk_buff *tx_skb[NUM_TX_BUFF];
struct sk_buff *rx_skb[NUM_RX_BUFF];
/* Stats
*/
struct emac_error_stats estats;
struct emac_stats stats;
/* Misc
*/
int reset_failed;
int stop_timeout; /* in us */
int no_mcast;
int mcast_pending;
int opened;
struct work_struct reset_work;
spinlock_t lock;
};
/*
* Features of various EMAC implementations
*/
/*
* No flow control on 40x according to the original driver
*/
#define EMAC_FTR_NO_FLOW_CONTROL_40x 0x00000001
/*
* Cell is an EMAC4
*/
#define EMAC_FTR_EMAC4 0x00000002
/*
* For the 440SPe, AMCC inexplicably changed the polarity of
* the "operation complete" bit in the MII control register.
*/
#define EMAC_FTR_STACR_OC_INVERT 0x00000004
/*
* Set if we have a TAH.
*/
#define EMAC_FTR_HAS_TAH 0x00000008
/*
* Set if we have a ZMII.
*/
#define EMAC_FTR_HAS_ZMII 0x00000010
/*
* Set if we have a RGMII.
*/
#define EMAC_FTR_HAS_RGMII 0x00000020
/*
* Set if we have new type STACR with STAOPC
*/
#define EMAC_FTR_HAS_NEW_STACR 0x00000040
/*
* Set if we need phy clock workaround for 440gx
*/
#define EMAC_FTR_440GX_PHY_CLK_FIX 0x00000080
/*
* Set if we need phy clock workaround for 440ep or 440gr
*/
#define EMAC_FTR_440EP_PHY_CLK_FIX 0x00000100
/*
* The 405EX and 460EX contain the EMAC4SYNC core
*/
#define EMAC_FTR_EMAC4SYNC 0x00000200
/*
* Set if we need phy clock workaround for 460ex or 460gt
*/
#define EMAC_FTR_460EX_PHY_CLK_FIX 0x00000400
/*
* APM821xx requires Jumbo frame size set explicitly
*/
#define EMAC_APM821XX_REQ_JUMBO_FRAME_SIZE 0x00000800
/*
* APM821xx does not support Half Duplex mode
*/
#define EMAC_FTR_APM821XX_NO_HALF_DUPLEX 0x00001000
/* Right now, we don't quite handle the always/possible masks on the
* most optimal way as we don't have a way to say something like
* always EMAC4. Patches welcome.
*/
enum {
EMAC_FTRS_ALWAYS = 0,
EMAC_FTRS_POSSIBLE =
#ifdef CONFIG_IBM_EMAC_EMAC4
EMAC_FTR_EMAC4 | EMAC_FTR_EMAC4SYNC |
EMAC_FTR_HAS_NEW_STACR |
EMAC_FTR_STACR_OC_INVERT | EMAC_FTR_440GX_PHY_CLK_FIX |
#endif
#ifdef CONFIG_IBM_EMAC_TAH
EMAC_FTR_HAS_TAH |
#endif
#ifdef CONFIG_IBM_EMAC_ZMII
EMAC_FTR_HAS_ZMII |
#endif
#ifdef CONFIG_IBM_EMAC_RGMII
EMAC_FTR_HAS_RGMII |
#endif
#ifdef CONFIG_IBM_EMAC_NO_FLOW_CTRL
EMAC_FTR_NO_FLOW_CONTROL_40x |
#endif
EMAC_FTR_460EX_PHY_CLK_FIX |
EMAC_FTR_440EP_PHY_CLK_FIX |
EMAC_APM821XX_REQ_JUMBO_FRAME_SIZE |
EMAC_FTR_APM821XX_NO_HALF_DUPLEX,
};
static inline int emac_has_feature(struct emac_instance *dev,
unsigned long feature)
{
return (EMAC_FTRS_ALWAYS & feature) ||
(EMAC_FTRS_POSSIBLE & dev->features & feature);
}
/*
* Various instances of the EMAC core have varying 1) number of
* address match slots, 2) width of the registers for handling address
* match slots, 3) number of registers for handling address match
* slots and 4) base offset for those registers.
*
* These macros and inlines handle these differences based on
* parameters supplied by the device structure which are, in turn,
* initialized based on the "compatible" entry in the device tree.
*/
#define EMAC4_XAHT_SLOTS_SHIFT 6
#define EMAC4_XAHT_WIDTH_SHIFT 4
#define EMAC4SYNC_XAHT_SLOTS_SHIFT 8
#define EMAC4SYNC_XAHT_WIDTH_SHIFT 5
#define EMAC_XAHT_SLOTS(dev) (1 << (dev)->xaht_slots_shift)
#define EMAC_XAHT_WIDTH(dev) (1 << (dev)->xaht_width_shift)
#define EMAC_XAHT_REGS(dev) (1 << ((dev)->xaht_slots_shift - \
(dev)->xaht_width_shift))
#define EMAC_XAHT_CRC_TO_SLOT(dev, crc) \
((EMAC_XAHT_SLOTS(dev) - 1) - \
((crc) >> ((sizeof (u32) * BITS_PER_BYTE) - \
(dev)->xaht_slots_shift)))
#define EMAC_XAHT_SLOT_TO_REG(dev, slot) \
((slot) >> (dev)->xaht_width_shift)
#define EMAC_XAHT_SLOT_TO_MASK(dev, slot) \
((u32)(1 << (EMAC_XAHT_WIDTH(dev) - 1)) >> \
((slot) & (u32)(EMAC_XAHT_WIDTH(dev) - 1)))
static inline u32 *emac_xaht_base(struct emac_instance *dev)
{
struct emac_regs __iomem *p = dev->emacp;
int offset;
/* The first IAHT entry always is the base of the block of
* IAHT and GAHT registers.
*/
if (emac_has_feature(dev, EMAC_FTR_EMAC4SYNC))
offset = offsetof(struct emac_regs, u1.emac4sync.iaht1);
else
offset = offsetof(struct emac_regs, u0.emac4.iaht1);
return (u32 *)((ptrdiff_t)p + offset);
}
static inline u32 *emac_gaht_base(struct emac_instance *dev)
{
/* GAHT registers always come after an identical number of
* IAHT registers.
*/
return emac_xaht_base(dev) + EMAC_XAHT_REGS(dev);
}
static inline u32 *emac_iaht_base(struct emac_instance *dev)
{
/* IAHT registers always come before an identical number of
* GAHT registers.
*/
return emac_xaht_base(dev);
}
/* Ethtool get_regs complex data.
* We want to get not just EMAC registers, but also MAL, ZMII, RGMII, TAH
* when available.
*
* Returned BLOB consists of the ibm_emac_ethtool_regs_hdr,
* MAL registers, EMAC registers and optional ZMII, RGMII, TAH registers.
* Each register component is preceded with emac_ethtool_regs_subhdr.
* Order of the optional headers follows their relative bit posititions
* in emac_ethtool_regs_hdr.components
*/
#define EMAC_ETHTOOL_REGS_ZMII 0x00000001
#define EMAC_ETHTOOL_REGS_RGMII 0x00000002
#define EMAC_ETHTOOL_REGS_TAH 0x00000004
struct emac_ethtool_regs_hdr {
u32 components;
};
struct emac_ethtool_regs_subhdr {
u32 version;
u32 index;
};
#define EMAC_ETHTOOL_REGS_VER 3
#define EMAC4_ETHTOOL_REGS_VER 4
#define EMAC4SYNC_ETHTOOL_REGS_VER 5
#endif /* __IBM_NEWEMAC_CORE_H */
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