2 * drivers/net/ibm_newemac/core.h
4 * Driver for PowerPC 4xx on-chip ethernet controller.
6 * Copyright 2007 Benjamin Herrenschmidt, IBM Corp.
7 * <benh@kernel.crashing.org>
9 * Based on the arch/ppc version of the driver:
11 * Copyright (c) 2004, 2005 Zultys Technologies.
12 * Eugene Surovegin <eugene.surovegin@zultys.com> or <ebs@ebshome.net>
14 * Based on original work by
15 * Armin Kuster <akuster@mvista.com>
16 * Johnnie Peters <jpeters@mvista.com>
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/init.h>
30 #include <linux/list.h>
31 #include <linux/kernel.h>
32 #include <linux/interrupt.h>
33 #include <linux/netdevice.h>
34 #include <linux/dma-mapping.h>
35 #include <linux/spinlock.h>
36 #include <linux/of_platform.h>
49 #define NUM_TX_BUFF CONFIG_IBM_NEW_EMAC_TXB
50 #define NUM_RX_BUFF CONFIG_IBM_NEW_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_NEW_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 resource rsrc_regs;
171 struct emac_regs __iomem *emacp;
172 struct of_device *ofdev;
173 struct device_node **blist; /* bootlist entry */
177 struct of_device *mal_dev;
180 struct mal_instance *mal;
181 struct mal_commac commac;
189 struct mutex link_lock;
190 struct delayed_work link_work;
196 /* Shared MDIO if any */
198 struct of_device *mdio_dev;
199 struct emac_instance *mdio_instance;
200 struct mutex mdio_lock;
202 /* ZMII infos if any */
205 struct of_device *zmii_dev;
207 /* RGMII infos if any */
210 struct of_device *rgmii_dev;
212 /* TAH infos if any */
215 struct of_device *tah_dev;
221 /* OPB bus frequency in Mhz */
224 /* Cell index within an ASIC (for clk mgmnt) */
227 /* Max supported MTU */
230 /* Feature bits (from probe table) */
231 unsigned int features;
233 /* Tx and Rx fifo sizes & other infos in bytes */
235 u32 tx_fifo_size_gige;
237 u32 rx_fifo_size_gige;
239 u32 mal_burst_size; /* move to MAL ? */
241 /* IAHT and GAHT filter parameterization */
242 u32 xaht_slots_shift;
243 u32 xaht_width_shift;
245 /* Descriptor management
247 struct mal_descriptor *tx_desc;
252 struct mal_descriptor *rx_desc;
254 struct sk_buff *rx_sg_skb; /* 1 */
258 struct sk_buff *tx_skb[NUM_TX_BUFF];
259 struct sk_buff *rx_skb[NUM_RX_BUFF];
263 struct emac_error_stats estats;
264 struct net_device_stats nstats;
265 struct emac_stats stats;
270 int stop_timeout; /* in us */
274 struct work_struct reset_work;
279 * Features of various EMAC implementations
283 * No flow control on 40x according to the original driver
285 #define EMAC_FTR_NO_FLOW_CONTROL_40x 0x00000001
289 #define EMAC_FTR_EMAC4 0x00000002
291 * For the 440SPe, AMCC inexplicably changed the polarity of
292 * the "operation complete" bit in the MII control register.
294 #define EMAC_FTR_STACR_OC_INVERT 0x00000004
296 * Set if we have a TAH.
298 #define EMAC_FTR_HAS_TAH 0x00000008
300 * Set if we have a ZMII.
302 #define EMAC_FTR_HAS_ZMII 0x00000010
304 * Set if we have a RGMII.
306 #define EMAC_FTR_HAS_RGMII 0x00000020
308 * Set if we have new type STACR with STAOPC
310 #define EMAC_FTR_HAS_NEW_STACR 0x00000040
312 * Set if we need phy clock workaround for 440gx
314 #define EMAC_FTR_440GX_PHY_CLK_FIX 0x00000080
316 * Set if we need phy clock workaround for 440ep or 440gr
318 #define EMAC_FTR_440EP_PHY_CLK_FIX 0x00000100
320 * The 405EX and 460EX contain the EMAC4SYNC core
322 #define EMAC_FTR_EMAC4SYNC 0x00000200
324 * Set if we need phy clock workaround for 460ex or 460gt
326 #define EMAC_FTR_460EX_PHY_CLK_FIX 0x00000400
329 /* Right now, we don't quite handle the always/possible masks on the
330 * most optimal way as we don't have a way to say something like
331 * always EMAC4. Patches welcome.
334 EMAC_FTRS_ALWAYS = 0,
337 #ifdef CONFIG_IBM_NEW_EMAC_EMAC4
338 EMAC_FTR_EMAC4 | EMAC_FTR_EMAC4SYNC |
339 EMAC_FTR_HAS_NEW_STACR |
340 EMAC_FTR_STACR_OC_INVERT | EMAC_FTR_440GX_PHY_CLK_FIX |
342 #ifdef CONFIG_IBM_NEW_EMAC_TAH
345 #ifdef CONFIG_IBM_NEW_EMAC_ZMII
348 #ifdef CONFIG_IBM_NEW_EMAC_RGMII
351 #ifdef CONFIG_IBM_NEW_EMAC_NO_FLOW_CTRL
352 EMAC_FTR_NO_FLOW_CONTROL_40x |
354 EMAC_FTR_460EX_PHY_CLK_FIX |
355 EMAC_FTR_440EP_PHY_CLK_FIX,
358 static inline int emac_has_feature(struct emac_instance *dev,
359 unsigned long feature)
361 return (EMAC_FTRS_ALWAYS & feature) ||
362 (EMAC_FTRS_POSSIBLE & dev->features & feature);
366 * Various instances of the EMAC core have varying 1) number of
367 * address match slots, 2) width of the registers for handling address
368 * match slots, 3) number of registers for handling address match
369 * slots and 4) base offset for those registers.
371 * These macros and inlines handle these differences based on
372 * parameters supplied by the device structure which are, in turn,
373 * initialized based on the "compatible" entry in the device tree.
376 #define EMAC4_XAHT_SLOTS_SHIFT 6
377 #define EMAC4_XAHT_WIDTH_SHIFT 4
379 #define EMAC4SYNC_XAHT_SLOTS_SHIFT 8
380 #define EMAC4SYNC_XAHT_WIDTH_SHIFT 5
382 #define EMAC_XAHT_SLOTS(dev) (1 << (dev)->xaht_slots_shift)
383 #define EMAC_XAHT_WIDTH(dev) (1 << (dev)->xaht_width_shift)
384 #define EMAC_XAHT_REGS(dev) (1 << ((dev)->xaht_slots_shift - \
385 (dev)->xaht_width_shift))
387 #define EMAC_XAHT_CRC_TO_SLOT(dev, crc) \
388 ((EMAC_XAHT_SLOTS(dev) - 1) - \
389 ((crc) >> ((sizeof (u32) * BITS_PER_BYTE) - \
390 (dev)->xaht_slots_shift)))
392 #define EMAC_XAHT_SLOT_TO_REG(dev, slot) \
393 ((slot) >> (dev)->xaht_width_shift)
395 #define EMAC_XAHT_SLOT_TO_MASK(dev, slot) \
396 ((u32)(1 << (EMAC_XAHT_WIDTH(dev) - 1)) >> \
397 ((slot) & (u32)(EMAC_XAHT_WIDTH(dev) - 1)))
399 static inline u32 *emac_xaht_base(struct emac_instance *dev)
401 struct emac_regs __iomem *p = dev->emacp;
404 /* The first IAHT entry always is the base of the block of
405 * IAHT and GAHT registers.
407 if (emac_has_feature(dev, EMAC_FTR_EMAC4SYNC))
408 offset = offsetof(struct emac_regs, u1.emac4sync.iaht1);
410 offset = offsetof(struct emac_regs, u0.emac4.iaht1);
412 return ((u32 *)((ptrdiff_t)p + offset));
415 static inline u32 *emac_gaht_base(struct emac_instance *dev)
417 /* GAHT registers always come after an identical number of
420 return (emac_xaht_base(dev) + EMAC_XAHT_REGS(dev));
423 static inline u32 *emac_iaht_base(struct emac_instance *dev)
425 /* IAHT registers always come before an identical number of
428 return (emac_xaht_base(dev));
431 /* Ethtool get_regs complex data.
432 * We want to get not just EMAC registers, but also MAL, ZMII, RGMII, TAH
435 * Returned BLOB consists of the ibm_emac_ethtool_regs_hdr,
436 * MAL registers, EMAC registers and optional ZMII, RGMII, TAH registers.
437 * Each register component is preceded with emac_ethtool_regs_subhdr.
438 * Order of the optional headers follows their relative bit posititions
439 * in emac_ethtool_regs_hdr.components
441 #define EMAC_ETHTOOL_REGS_ZMII 0x00000001
442 #define EMAC_ETHTOOL_REGS_RGMII 0x00000002
443 #define EMAC_ETHTOOL_REGS_TAH 0x00000004
445 struct emac_ethtool_regs_hdr {
449 struct emac_ethtool_regs_subhdr {
454 #define EMAC_ETHTOOL_REGS_VER 0
455 #define EMAC_ETHTOOL_REGS_SIZE(dev) ((dev)->rsrc_regs.end - \
456 (dev)->rsrc_regs.start + 1)
457 #define EMAC4_ETHTOOL_REGS_VER 1
458 #define EMAC4_ETHTOOL_REGS_SIZE(dev) ((dev)->rsrc_regs.end - \
459 (dev)->rsrc_regs.start + 1)
461 #endif /* __IBM_NEWEMAC_CORE_H */