2 * drivers/net/ethernet/ibm/emac/core.h
4 * Driver for PowerPC 4xx on-chip ethernet controller.
6 * Copyright 2007 Benjamin Herrenschmidt, IBM Corp.
9 * Based on the arch/ppc version of the driver:
11 * Copyright (c) 2004, 2005 Zultys Technologies.
14 * Based on original work by
17 * Copyright 2000, 2001 MontaVista Softare Inc.
19 * This program is free software; you can redistribute it and/or modify it
20 * under the terms of the GNU General Public License as published by the
21 * Free Software Foundation; either version 2 of the License, or (at your
22 * option) any later version.
25 #ifndef __IBM_NEWEMAC_CORE_H
26 #define __IBM_NEWEMAC_CORE_H
28 #include <linux/module.h>
29 #include <linux/list.h>
30 #include <linux/kernel.h>
31 #include <linux/interrupt.h>
32 #include <linux/netdevice.h>
33 #include <linux/dma-mapping.h>
34 #include <linux/spinlock.h>
35 #include <linux/of_platform.h>
36 #include <linux/slab.h>
49 #define NUM_TX_BUFF CONFIG_IBM_EMAC_TXB
50 #define NUM_RX_BUFF CONFIG_IBM_EMAC_RXB
52 /* Simple sanity check */
53 #if NUM_TX_BUFF > 256 || NUM_RX_BUFF > 256
54 #error Invalid number of buffer descriptors (greater than 256)
57 #define EMAC_MIN_MTU 46
59 /* Maximum L2 header length (VLAN tagged, no FCS) */
60 #define EMAC_MTU_OVERHEAD (6 * 2 + 2 + 4)
62 /* RX BD size for the given MTU */
63 static inline int emac_rx_size(int mtu)
65 if (mtu > ETH_DATA_LEN)
66 return MAL_MAX_RX_SIZE;
68 return mal_rx_size(ETH_DATA_LEN + EMAC_MTU_OVERHEAD);
71 #define EMAC_DMA_ALIGN(x) ALIGN((x), dma_get_cache_alignment())
73 #define EMAC_RX_SKB_HEADROOM \
74 EMAC_DMA_ALIGN(CONFIG_IBM_EMAC_RX_SKB_HEADROOM)
76 /* Size of RX skb for the given MTU */
77 static inline int emac_rx_skb_size(int mtu)
79 int size = max(mtu + EMAC_MTU_OVERHEAD, emac_rx_size(mtu));
80 return EMAC_DMA_ALIGN(size + 2) + EMAC_RX_SKB_HEADROOM;
83 /* RX DMA sync size */
84 static inline int emac_rx_sync_size(int mtu)
86 return EMAC_DMA_ALIGN(emac_rx_size(mtu) + 2);
89 /* Driver statistcs is split into two parts to make it more cache friendly:
90 * - normal statistics (packet count, etc)
93 * When statistics is requested by ethtool, these parts are concatenated,
94 * normal one goes first.
96 * Please, keep these structures in sync with emac_stats_keys.
99 /* Normal TX/RX Statistics */
109 /* Error statistics */
110 struct emac_error_stats {
113 /* Software RX Errors */
114 u64 rx_dropped_stack;
116 u64 rx_dropped_error;
117 u64 rx_dropped_resize;
120 /* BD reported RX errors */
123 u64 rx_bd_bad_packet;
124 u64 rx_bd_runt_packet;
125 u64 rx_bd_short_event;
126 u64 rx_bd_alignment_error;
128 u64 rx_bd_packet_too_long;
129 u64 rx_bd_out_of_range;
131 /* EMAC IRQ reported RX errors */
138 u64 rx_alignment_error;
140 u64 rx_packet_too_long;
144 /* Software TX Errors */
146 /* BD reported TX errors */
149 u64 tx_bd_carrier_loss;
150 u64 tx_bd_excessive_deferral;
151 u64 tx_bd_excessive_collisions;
152 u64 tx_bd_late_collision;
153 u64 tx_bd_multple_collisions;
154 u64 tx_bd_single_collision;
157 /* EMAC IRQ reported TX errors */
164 #define EMAC_ETHTOOL_STATS_COUNT ((sizeof(struct emac_stats) + \
165 sizeof(struct emac_error_stats)) \
168 struct emac_instance {
169 struct net_device *ndev;
170 struct emac_regs __iomem *emacp;
171 struct platform_device *ofdev;
172 struct device_node **blist; /* bootlist entry */
176 struct platform_device *mal_dev;
179 struct mal_instance *mal;
180 struct mal_commac commac;
188 struct mutex link_lock;
189 struct delayed_work link_work;
195 /* Shared MDIO if any */
197 struct platform_device *mdio_dev;
198 struct emac_instance *mdio_instance;
199 struct mutex mdio_lock;
201 /* Device-tree based phy configuration */
202 struct mii_bus *mii_bus;
203 struct phy_device *phy_dev;
205 /* ZMII infos if any */
208 struct platform_device *zmii_dev;
210 /* RGMII infos if any */
213 struct platform_device *rgmii_dev;
215 /* TAH infos if any */
218 struct platform_device *tah_dev;
224 /* OPB bus frequency in Mhz */
227 /* Cell index within an ASIC (for clk mgmnt) */
230 /* Max supported MTU */
233 /* Feature bits (from probe table) */
234 unsigned int features;
236 /* Tx and Rx fifo sizes & other infos in bytes */
238 u32 tx_fifo_size_gige;
240 u32 rx_fifo_size_gige;
242 u32 mal_burst_size; /* move to MAL ? */
244 /* IAHT and GAHT filter parameterization */
245 u32 xaht_slots_shift;
246 u32 xaht_width_shift;
248 /* Descriptor management
250 struct mal_descriptor *tx_desc;
255 struct mal_descriptor *rx_desc;
257 struct sk_buff *rx_sg_skb; /* 1 */
261 struct sk_buff *tx_skb[NUM_TX_BUFF];
262 struct sk_buff *rx_skb[NUM_RX_BUFF];
266 struct emac_error_stats estats;
267 struct emac_stats stats;
272 int stop_timeout; /* in us */
276 struct work_struct reset_work;
281 * Features of various EMAC implementations
285 * No flow control on 40x according to the original driver
287 #define EMAC_FTR_NO_FLOW_CONTROL_40x 0x00000001
291 #define EMAC_FTR_EMAC4 0x00000002
293 * For the 440SPe, AMCC inexplicably changed the polarity of
294 * the "operation complete" bit in the MII control register.
296 #define EMAC_FTR_STACR_OC_INVERT 0x00000004
298 * Set if we have a TAH.
300 #define EMAC_FTR_HAS_TAH 0x00000008
302 * Set if we have a ZMII.
304 #define EMAC_FTR_HAS_ZMII 0x00000010
306 * Set if we have a RGMII.
308 #define EMAC_FTR_HAS_RGMII 0x00000020
310 * Set if we have new type STACR with STAOPC
312 #define EMAC_FTR_HAS_NEW_STACR 0x00000040
314 * Set if we need phy clock workaround for 440gx
316 #define EMAC_FTR_440GX_PHY_CLK_FIX 0x00000080
318 * Set if we need phy clock workaround for 440ep or 440gr
320 #define EMAC_FTR_440EP_PHY_CLK_FIX 0x00000100
322 * The 405EX and 460EX contain the EMAC4SYNC core
324 #define EMAC_FTR_EMAC4SYNC 0x00000200
326 * Set if we need phy clock workaround for 460ex or 460gt
328 #define EMAC_FTR_460EX_PHY_CLK_FIX 0x00000400
330 * APM821xx requires Jumbo frame size set explicitly
332 #define EMAC_APM821XX_REQ_JUMBO_FRAME_SIZE 0x00000800
334 * APM821xx does not support Half Duplex mode
336 #define EMAC_FTR_APM821XX_NO_HALF_DUPLEX 0x00001000
338 /* Right now, we don't quite handle the always/possible masks on the
339 * most optimal way as we don't have a way to say something like
340 * always EMAC4. Patches welcome.
343 EMAC_FTRS_ALWAYS = 0,
346 #ifdef CONFIG_IBM_EMAC_EMAC4
347 EMAC_FTR_EMAC4 | EMAC_FTR_EMAC4SYNC |
348 EMAC_FTR_HAS_NEW_STACR |
349 EMAC_FTR_STACR_OC_INVERT | EMAC_FTR_440GX_PHY_CLK_FIX |
351 #ifdef CONFIG_IBM_EMAC_TAH
354 #ifdef CONFIG_IBM_EMAC_ZMII
357 #ifdef CONFIG_IBM_EMAC_RGMII
360 #ifdef CONFIG_IBM_EMAC_NO_FLOW_CTRL
361 EMAC_FTR_NO_FLOW_CONTROL_40x |
363 EMAC_FTR_460EX_PHY_CLK_FIX |
364 EMAC_FTR_440EP_PHY_CLK_FIX |
365 EMAC_APM821XX_REQ_JUMBO_FRAME_SIZE |
366 EMAC_FTR_APM821XX_NO_HALF_DUPLEX,
369 static inline int emac_has_feature(struct emac_instance *dev,
370 unsigned long feature)
372 return (EMAC_FTRS_ALWAYS & feature) ||
373 (EMAC_FTRS_POSSIBLE & dev->features & feature);
377 * Various instances of the EMAC core have varying 1) number of
378 * address match slots, 2) width of the registers for handling address
379 * match slots, 3) number of registers for handling address match
380 * slots and 4) base offset for those registers.
382 * These macros and inlines handle these differences based on
383 * parameters supplied by the device structure which are, in turn,
384 * initialized based on the "compatible" entry in the device tree.
387 #define EMAC4_XAHT_SLOTS_SHIFT 6
388 #define EMAC4_XAHT_WIDTH_SHIFT 4
390 #define EMAC4SYNC_XAHT_SLOTS_SHIFT 8
391 #define EMAC4SYNC_XAHT_WIDTH_SHIFT 5
393 #define EMAC_XAHT_SLOTS(dev) (1 << (dev)->xaht_slots_shift)
394 #define EMAC_XAHT_WIDTH(dev) (1 << (dev)->xaht_width_shift)
395 #define EMAC_XAHT_REGS(dev) (1 << ((dev)->xaht_slots_shift - \
396 (dev)->xaht_width_shift))
398 #define EMAC_XAHT_CRC_TO_SLOT(dev, crc) \
399 ((EMAC_XAHT_SLOTS(dev) - 1) - \
400 ((crc) >> ((sizeof (u32) * BITS_PER_BYTE) - \
401 (dev)->xaht_slots_shift)))
403 #define EMAC_XAHT_SLOT_TO_REG(dev, slot) \
404 ((slot) >> (dev)->xaht_width_shift)
406 #define EMAC_XAHT_SLOT_TO_MASK(dev, slot) \
407 ((u32)(1 << (EMAC_XAHT_WIDTH(dev) - 1)) >> \
408 ((slot) & (u32)(EMAC_XAHT_WIDTH(dev) - 1)))
410 static inline u32 *emac_xaht_base(struct emac_instance *dev)
412 struct emac_regs __iomem *p = dev->emacp;
415 /* The first IAHT entry always is the base of the block of
416 * IAHT and GAHT registers.
418 if (emac_has_feature(dev, EMAC_FTR_EMAC4SYNC))
419 offset = offsetof(struct emac_regs, u1.emac4sync.iaht1);
421 offset = offsetof(struct emac_regs, u0.emac4.iaht1);
423 return (u32 *)((ptrdiff_t)p + offset);
426 static inline u32 *emac_gaht_base(struct emac_instance *dev)
428 /* GAHT registers always come after an identical number of
431 return emac_xaht_base(dev) + EMAC_XAHT_REGS(dev);
434 static inline u32 *emac_iaht_base(struct emac_instance *dev)
436 /* IAHT registers always come before an identical number of
439 return emac_xaht_base(dev);
442 /* Ethtool get_regs complex data.
443 * We want to get not just EMAC registers, but also MAL, ZMII, RGMII, TAH
446 * Returned BLOB consists of the ibm_emac_ethtool_regs_hdr,
447 * MAL registers, EMAC registers and optional ZMII, RGMII, TAH registers.
448 * Each register component is preceded with emac_ethtool_regs_subhdr.
449 * Order of the optional headers follows their relative bit posititions
450 * in emac_ethtool_regs_hdr.components
452 #define EMAC_ETHTOOL_REGS_ZMII 0x00000001
453 #define EMAC_ETHTOOL_REGS_RGMII 0x00000002
454 #define EMAC_ETHTOOL_REGS_TAH 0x00000004
456 struct emac_ethtool_regs_hdr {
460 struct emac_ethtool_regs_subhdr {
465 #define EMAC_ETHTOOL_REGS_VER 3
466 #define EMAC4_ETHTOOL_REGS_VER 4
467 #define EMAC4SYNC_ETHTOOL_REGS_VER 5
469 #endif /* __IBM_NEWEMAC_CORE_H */