Version:  2.0.40 2.2.26 2.4.37 3.1 3.2 3.3 3.4 3.5 3.6 3.7 3.8 3.9 3.10 3.11 3.12 3.13 3.14 3.15 3.16 3.17

Linux/drivers/net/ethernet/broadcom/genet/bcmgenet.c

  1 /*
  2  * Broadcom GENET (Gigabit Ethernet) controller driver
  3  *
  4  * Copyright (c) 2014 Broadcom Corporation
  5  *
  6  * This program is free software; you can redistribute it and/or modify
  7  * it under the terms of the GNU General Public License version 2 as
  8  * published by the Free Software Foundation.
  9  */
 10 
 11 #define pr_fmt(fmt)                             "bcmgenet: " fmt
 12 
 13 #include <linux/kernel.h>
 14 #include <linux/module.h>
 15 #include <linux/sched.h>
 16 #include <linux/types.h>
 17 #include <linux/fcntl.h>
 18 #include <linux/interrupt.h>
 19 #include <linux/string.h>
 20 #include <linux/if_ether.h>
 21 #include <linux/init.h>
 22 #include <linux/errno.h>
 23 #include <linux/delay.h>
 24 #include <linux/platform_device.h>
 25 #include <linux/dma-mapping.h>
 26 #include <linux/pm.h>
 27 #include <linux/clk.h>
 28 #include <linux/of.h>
 29 #include <linux/of_address.h>
 30 #include <linux/of_irq.h>
 31 #include <linux/of_net.h>
 32 #include <linux/of_platform.h>
 33 #include <net/arp.h>
 34 
 35 #include <linux/mii.h>
 36 #include <linux/ethtool.h>
 37 #include <linux/netdevice.h>
 38 #include <linux/inetdevice.h>
 39 #include <linux/etherdevice.h>
 40 #include <linux/skbuff.h>
 41 #include <linux/in.h>
 42 #include <linux/ip.h>
 43 #include <linux/ipv6.h>
 44 #include <linux/phy.h>
 45 
 46 #include <asm/unaligned.h>
 47 
 48 #include "bcmgenet.h"
 49 
 50 /* Maximum number of hardware queues, downsized if needed */
 51 #define GENET_MAX_MQ_CNT        4
 52 
 53 /* Default highest priority queue for multi queue support */
 54 #define GENET_Q0_PRIORITY       0
 55 
 56 #define GENET_DEFAULT_BD_CNT    \
 57         (TOTAL_DESC - priv->hw_params->tx_queues * priv->hw_params->bds_cnt)
 58 
 59 #define RX_BUF_LENGTH           2048
 60 #define SKB_ALIGNMENT           32
 61 
 62 /* Tx/Rx DMA register offset, skip 256 descriptors */
 63 #define WORDS_PER_BD(p)         (p->hw_params->words_per_bd)
 64 #define DMA_DESC_SIZE           (WORDS_PER_BD(priv) * sizeof(u32))
 65 
 66 #define GENET_TDMA_REG_OFF      (priv->hw_params->tdma_offset + \
 67                                 TOTAL_DESC * DMA_DESC_SIZE)
 68 
 69 #define GENET_RDMA_REG_OFF      (priv->hw_params->rdma_offset + \
 70                                 TOTAL_DESC * DMA_DESC_SIZE)
 71 
 72 static inline void dmadesc_set_length_status(struct bcmgenet_priv *priv,
 73                                              void __iomem *d, u32 value)
 74 {
 75         __raw_writel(value, d + DMA_DESC_LENGTH_STATUS);
 76 }
 77 
 78 static inline u32 dmadesc_get_length_status(struct bcmgenet_priv *priv,
 79                                             void __iomem *d)
 80 {
 81         return __raw_readl(d + DMA_DESC_LENGTH_STATUS);
 82 }
 83 
 84 static inline void dmadesc_set_addr(struct bcmgenet_priv *priv,
 85                                     void __iomem *d,
 86                                     dma_addr_t addr)
 87 {
 88         __raw_writel(lower_32_bits(addr), d + DMA_DESC_ADDRESS_LO);
 89 
 90         /* Register writes to GISB bus can take couple hundred nanoseconds
 91          * and are done for each packet, save these expensive writes unless
 92          * the platform is explicitly configured for 64-bits/LPAE.
 93          */
 94 #ifdef CONFIG_PHYS_ADDR_T_64BIT
 95         if (priv->hw_params->flags & GENET_HAS_40BITS)
 96                 __raw_writel(upper_32_bits(addr), d + DMA_DESC_ADDRESS_HI);
 97 #endif
 98 }
 99 
100 /* Combined address + length/status setter */
101 static inline void dmadesc_set(struct bcmgenet_priv *priv,
102                                void __iomem *d, dma_addr_t addr, u32 val)
103 {
104         dmadesc_set_length_status(priv, d, val);
105         dmadesc_set_addr(priv, d, addr);
106 }
107 
108 static inline dma_addr_t dmadesc_get_addr(struct bcmgenet_priv *priv,
109                                           void __iomem *d)
110 {
111         dma_addr_t addr;
112 
113         addr = __raw_readl(d + DMA_DESC_ADDRESS_LO);
114 
115         /* Register writes to GISB bus can take couple hundred nanoseconds
116          * and are done for each packet, save these expensive writes unless
117          * the platform is explicitly configured for 64-bits/LPAE.
118          */
119 #ifdef CONFIG_PHYS_ADDR_T_64BIT
120         if (priv->hw_params->flags & GENET_HAS_40BITS)
121                 addr |= (u64)__raw_readl(d + DMA_DESC_ADDRESS_HI) << 32;
122 #endif
123         return addr;
124 }
125 
126 #define GENET_VER_FMT   "%1d.%1d EPHY: 0x%04x"
127 
128 #define GENET_MSG_DEFAULT       (NETIF_MSG_DRV | NETIF_MSG_PROBE | \
129                                 NETIF_MSG_LINK)
130 
131 static inline u32 bcmgenet_rbuf_ctrl_get(struct bcmgenet_priv *priv)
132 {
133         if (GENET_IS_V1(priv))
134                 return bcmgenet_rbuf_readl(priv, RBUF_FLUSH_CTRL_V1);
135         else
136                 return bcmgenet_sys_readl(priv, SYS_RBUF_FLUSH_CTRL);
137 }
138 
139 static inline void bcmgenet_rbuf_ctrl_set(struct bcmgenet_priv *priv, u32 val)
140 {
141         if (GENET_IS_V1(priv))
142                 bcmgenet_rbuf_writel(priv, val, RBUF_FLUSH_CTRL_V1);
143         else
144                 bcmgenet_sys_writel(priv, val, SYS_RBUF_FLUSH_CTRL);
145 }
146 
147 /* These macros are defined to deal with register map change
148  * between GENET1.1 and GENET2. Only those currently being used
149  * by driver are defined.
150  */
151 static inline u32 bcmgenet_tbuf_ctrl_get(struct bcmgenet_priv *priv)
152 {
153         if (GENET_IS_V1(priv))
154                 return bcmgenet_rbuf_readl(priv, TBUF_CTRL_V1);
155         else
156                 return __raw_readl(priv->base +
157                                 priv->hw_params->tbuf_offset + TBUF_CTRL);
158 }
159 
160 static inline void bcmgenet_tbuf_ctrl_set(struct bcmgenet_priv *priv, u32 val)
161 {
162         if (GENET_IS_V1(priv))
163                 bcmgenet_rbuf_writel(priv, val, TBUF_CTRL_V1);
164         else
165                 __raw_writel(val, priv->base +
166                                 priv->hw_params->tbuf_offset + TBUF_CTRL);
167 }
168 
169 static inline u32 bcmgenet_bp_mc_get(struct bcmgenet_priv *priv)
170 {
171         if (GENET_IS_V1(priv))
172                 return bcmgenet_rbuf_readl(priv, TBUF_BP_MC_V1);
173         else
174                 return __raw_readl(priv->base +
175                                 priv->hw_params->tbuf_offset + TBUF_BP_MC);
176 }
177 
178 static inline void bcmgenet_bp_mc_set(struct bcmgenet_priv *priv, u32 val)
179 {
180         if (GENET_IS_V1(priv))
181                 bcmgenet_rbuf_writel(priv, val, TBUF_BP_MC_V1);
182         else
183                 __raw_writel(val, priv->base +
184                                 priv->hw_params->tbuf_offset + TBUF_BP_MC);
185 }
186 
187 /* RX/TX DMA register accessors */
188 enum dma_reg {
189         DMA_RING_CFG = 0,
190         DMA_CTRL,
191         DMA_STATUS,
192         DMA_SCB_BURST_SIZE,
193         DMA_ARB_CTRL,
194         DMA_PRIORITY,
195         DMA_RING_PRIORITY,
196 };
197 
198 static const u8 bcmgenet_dma_regs_v3plus[] = {
199         [DMA_RING_CFG]          = 0x00,
200         [DMA_CTRL]              = 0x04,
201         [DMA_STATUS]            = 0x08,
202         [DMA_SCB_BURST_SIZE]    = 0x0C,
203         [DMA_ARB_CTRL]          = 0x2C,
204         [DMA_PRIORITY]          = 0x30,
205         [DMA_RING_PRIORITY]     = 0x38,
206 };
207 
208 static const u8 bcmgenet_dma_regs_v2[] = {
209         [DMA_RING_CFG]          = 0x00,
210         [DMA_CTRL]              = 0x04,
211         [DMA_STATUS]            = 0x08,
212         [DMA_SCB_BURST_SIZE]    = 0x0C,
213         [DMA_ARB_CTRL]          = 0x30,
214         [DMA_PRIORITY]          = 0x34,
215         [DMA_RING_PRIORITY]     = 0x3C,
216 };
217 
218 static const u8 bcmgenet_dma_regs_v1[] = {
219         [DMA_CTRL]              = 0x00,
220         [DMA_STATUS]            = 0x04,
221         [DMA_SCB_BURST_SIZE]    = 0x0C,
222         [DMA_ARB_CTRL]          = 0x30,
223         [DMA_PRIORITY]          = 0x34,
224         [DMA_RING_PRIORITY]     = 0x3C,
225 };
226 
227 /* Set at runtime once bcmgenet version is known */
228 static const u8 *bcmgenet_dma_regs;
229 
230 static inline struct bcmgenet_priv *dev_to_priv(struct device *dev)
231 {
232         return netdev_priv(dev_get_drvdata(dev));
233 }
234 
235 static inline u32 bcmgenet_tdma_readl(struct bcmgenet_priv *priv,
236                                       enum dma_reg r)
237 {
238         return __raw_readl(priv->base + GENET_TDMA_REG_OFF +
239                         DMA_RINGS_SIZE + bcmgenet_dma_regs[r]);
240 }
241 
242 static inline void bcmgenet_tdma_writel(struct bcmgenet_priv *priv,
243                                         u32 val, enum dma_reg r)
244 {
245         __raw_writel(val, priv->base + GENET_TDMA_REG_OFF +
246                         DMA_RINGS_SIZE + bcmgenet_dma_regs[r]);
247 }
248 
249 static inline u32 bcmgenet_rdma_readl(struct bcmgenet_priv *priv,
250                                       enum dma_reg r)
251 {
252         return __raw_readl(priv->base + GENET_RDMA_REG_OFF +
253                         DMA_RINGS_SIZE + bcmgenet_dma_regs[r]);
254 }
255 
256 static inline void bcmgenet_rdma_writel(struct bcmgenet_priv *priv,
257                                         u32 val, enum dma_reg r)
258 {
259         __raw_writel(val, priv->base + GENET_RDMA_REG_OFF +
260                         DMA_RINGS_SIZE + bcmgenet_dma_regs[r]);
261 }
262 
263 /* RDMA/TDMA ring registers and accessors
264  * we merge the common fields and just prefix with T/D the registers
265  * having different meaning depending on the direction
266  */
267 enum dma_ring_reg {
268         TDMA_READ_PTR = 0,
269         RDMA_WRITE_PTR = TDMA_READ_PTR,
270         TDMA_READ_PTR_HI,
271         RDMA_WRITE_PTR_HI = TDMA_READ_PTR_HI,
272         TDMA_CONS_INDEX,
273         RDMA_PROD_INDEX = TDMA_CONS_INDEX,
274         TDMA_PROD_INDEX,
275         RDMA_CONS_INDEX = TDMA_PROD_INDEX,
276         DMA_RING_BUF_SIZE,
277         DMA_START_ADDR,
278         DMA_START_ADDR_HI,
279         DMA_END_ADDR,
280         DMA_END_ADDR_HI,
281         DMA_MBUF_DONE_THRESH,
282         TDMA_FLOW_PERIOD,
283         RDMA_XON_XOFF_THRESH = TDMA_FLOW_PERIOD,
284         TDMA_WRITE_PTR,
285         RDMA_READ_PTR = TDMA_WRITE_PTR,
286         TDMA_WRITE_PTR_HI,
287         RDMA_READ_PTR_HI = TDMA_WRITE_PTR_HI
288 };
289 
290 /* GENET v4 supports 40-bits pointer addressing
291  * for obvious reasons the LO and HI word parts
292  * are contiguous, but this offsets the other
293  * registers.
294  */
295 static const u8 genet_dma_ring_regs_v4[] = {
296         [TDMA_READ_PTR]                 = 0x00,
297         [TDMA_READ_PTR_HI]              = 0x04,
298         [TDMA_CONS_INDEX]               = 0x08,
299         [TDMA_PROD_INDEX]               = 0x0C,
300         [DMA_RING_BUF_SIZE]             = 0x10,
301         [DMA_START_ADDR]                = 0x14,
302         [DMA_START_ADDR_HI]             = 0x18,
303         [DMA_END_ADDR]                  = 0x1C,
304         [DMA_END_ADDR_HI]               = 0x20,
305         [DMA_MBUF_DONE_THRESH]          = 0x24,
306         [TDMA_FLOW_PERIOD]              = 0x28,
307         [TDMA_WRITE_PTR]                = 0x2C,
308         [TDMA_WRITE_PTR_HI]             = 0x30,
309 };
310 
311 static const u8 genet_dma_ring_regs_v123[] = {
312         [TDMA_READ_PTR]                 = 0x00,
313         [TDMA_CONS_INDEX]               = 0x04,
314         [TDMA_PROD_INDEX]               = 0x08,
315         [DMA_RING_BUF_SIZE]             = 0x0C,
316         [DMA_START_ADDR]                = 0x10,
317         [DMA_END_ADDR]                  = 0x14,
318         [DMA_MBUF_DONE_THRESH]          = 0x18,
319         [TDMA_FLOW_PERIOD]              = 0x1C,
320         [TDMA_WRITE_PTR]                = 0x20,
321 };
322 
323 /* Set at runtime once GENET version is known */
324 static const u8 *genet_dma_ring_regs;
325 
326 static inline u32 bcmgenet_tdma_ring_readl(struct bcmgenet_priv *priv,
327                                            unsigned int ring,
328                                            enum dma_ring_reg r)
329 {
330         return __raw_readl(priv->base + GENET_TDMA_REG_OFF +
331                         (DMA_RING_SIZE * ring) +
332                         genet_dma_ring_regs[r]);
333 }
334 
335 static inline void bcmgenet_tdma_ring_writel(struct bcmgenet_priv *priv,
336                                              unsigned int ring, u32 val,
337                                              enum dma_ring_reg r)
338 {
339         __raw_writel(val, priv->base + GENET_TDMA_REG_OFF +
340                         (DMA_RING_SIZE * ring) +
341                         genet_dma_ring_regs[r]);
342 }
343 
344 static inline u32 bcmgenet_rdma_ring_readl(struct bcmgenet_priv *priv,
345                                            unsigned int ring,
346                                            enum dma_ring_reg r)
347 {
348         return __raw_readl(priv->base + GENET_RDMA_REG_OFF +
349                         (DMA_RING_SIZE * ring) +
350                         genet_dma_ring_regs[r]);
351 }
352 
353 static inline void bcmgenet_rdma_ring_writel(struct bcmgenet_priv *priv,
354                                              unsigned int ring, u32 val,
355                                              enum dma_ring_reg r)
356 {
357         __raw_writel(val, priv->base + GENET_RDMA_REG_OFF +
358                         (DMA_RING_SIZE * ring) +
359                         genet_dma_ring_regs[r]);
360 }
361 
362 static int bcmgenet_get_settings(struct net_device *dev,
363                                  struct ethtool_cmd *cmd)
364 {
365         struct bcmgenet_priv *priv = netdev_priv(dev);
366 
367         if (!netif_running(dev))
368                 return -EINVAL;
369 
370         if (!priv->phydev)
371                 return -ENODEV;
372 
373         return phy_ethtool_gset(priv->phydev, cmd);
374 }
375 
376 static int bcmgenet_set_settings(struct net_device *dev,
377                                  struct ethtool_cmd *cmd)
378 {
379         struct bcmgenet_priv *priv = netdev_priv(dev);
380 
381         if (!netif_running(dev))
382                 return -EINVAL;
383 
384         if (!priv->phydev)
385                 return -ENODEV;
386 
387         return phy_ethtool_sset(priv->phydev, cmd);
388 }
389 
390 static int bcmgenet_set_rx_csum(struct net_device *dev,
391                                 netdev_features_t wanted)
392 {
393         struct bcmgenet_priv *priv = netdev_priv(dev);
394         u32 rbuf_chk_ctrl;
395         bool rx_csum_en;
396 
397         rx_csum_en = !!(wanted & NETIF_F_RXCSUM);
398 
399         rbuf_chk_ctrl = bcmgenet_rbuf_readl(priv, RBUF_CHK_CTRL);
400 
401         /* enable rx checksumming */
402         if (rx_csum_en)
403                 rbuf_chk_ctrl |= RBUF_RXCHK_EN;
404         else
405                 rbuf_chk_ctrl &= ~RBUF_RXCHK_EN;
406         priv->desc_rxchk_en = rx_csum_en;
407 
408         /* If UniMAC forwards CRC, we need to skip over it to get
409          * a valid CHK bit to be set in the per-packet status word
410         */
411         if (rx_csum_en && priv->crc_fwd_en)
412                 rbuf_chk_ctrl |= RBUF_SKIP_FCS;
413         else
414                 rbuf_chk_ctrl &= ~RBUF_SKIP_FCS;
415 
416         bcmgenet_rbuf_writel(priv, rbuf_chk_ctrl, RBUF_CHK_CTRL);
417 
418         return 0;
419 }
420 
421 static int bcmgenet_set_tx_csum(struct net_device *dev,
422                                 netdev_features_t wanted)
423 {
424         struct bcmgenet_priv *priv = netdev_priv(dev);
425         bool desc_64b_en;
426         u32 tbuf_ctrl, rbuf_ctrl;
427 
428         tbuf_ctrl = bcmgenet_tbuf_ctrl_get(priv);
429         rbuf_ctrl = bcmgenet_rbuf_readl(priv, RBUF_CTRL);
430 
431         desc_64b_en = !!(wanted & (NETIF_F_IP_CSUM | NETIF_F_IPV6_CSUM));
432 
433         /* enable 64 bytes descriptor in both directions (RBUF and TBUF) */
434         if (desc_64b_en) {
435                 tbuf_ctrl |= RBUF_64B_EN;
436                 rbuf_ctrl |= RBUF_64B_EN;
437         } else {
438                 tbuf_ctrl &= ~RBUF_64B_EN;
439                 rbuf_ctrl &= ~RBUF_64B_EN;
440         }
441         priv->desc_64b_en = desc_64b_en;
442 
443         bcmgenet_tbuf_ctrl_set(priv, tbuf_ctrl);
444         bcmgenet_rbuf_writel(priv, rbuf_ctrl, RBUF_CTRL);
445 
446         return 0;
447 }
448 
449 static int bcmgenet_set_features(struct net_device *dev,
450                                  netdev_features_t features)
451 {
452         netdev_features_t changed = features ^ dev->features;
453         netdev_features_t wanted = dev->wanted_features;
454         int ret = 0;
455 
456         if (changed & (NETIF_F_IP_CSUM | NETIF_F_IPV6_CSUM))
457                 ret = bcmgenet_set_tx_csum(dev, wanted);
458         if (changed & (NETIF_F_RXCSUM))
459                 ret = bcmgenet_set_rx_csum(dev, wanted);
460 
461         return ret;
462 }
463 
464 static u32 bcmgenet_get_msglevel(struct net_device *dev)
465 {
466         struct bcmgenet_priv *priv = netdev_priv(dev);
467 
468         return priv->msg_enable;
469 }
470 
471 static void bcmgenet_set_msglevel(struct net_device *dev, u32 level)
472 {
473         struct bcmgenet_priv *priv = netdev_priv(dev);
474 
475         priv->msg_enable = level;
476 }
477 
478 /* standard ethtool support functions. */
479 enum bcmgenet_stat_type {
480         BCMGENET_STAT_NETDEV = -1,
481         BCMGENET_STAT_MIB_RX,
482         BCMGENET_STAT_MIB_TX,
483         BCMGENET_STAT_RUNT,
484         BCMGENET_STAT_MISC,
485 };
486 
487 struct bcmgenet_stats {
488         char stat_string[ETH_GSTRING_LEN];
489         int stat_sizeof;
490         int stat_offset;
491         enum bcmgenet_stat_type type;
492         /* reg offset from UMAC base for misc counters */
493         u16 reg_offset;
494 };
495 
496 #define STAT_NETDEV(m) { \
497         .stat_string = __stringify(m), \
498         .stat_sizeof = sizeof(((struct net_device_stats *)0)->m), \
499         .stat_offset = offsetof(struct net_device_stats, m), \
500         .type = BCMGENET_STAT_NETDEV, \
501 }
502 
503 #define STAT_GENET_MIB(str, m, _type) { \
504         .stat_string = str, \
505         .stat_sizeof = sizeof(((struct bcmgenet_priv *)0)->m), \
506         .stat_offset = offsetof(struct bcmgenet_priv, m), \
507         .type = _type, \
508 }
509 
510 #define STAT_GENET_MIB_RX(str, m) STAT_GENET_MIB(str, m, BCMGENET_STAT_MIB_RX)
511 #define STAT_GENET_MIB_TX(str, m) STAT_GENET_MIB(str, m, BCMGENET_STAT_MIB_TX)
512 #define STAT_GENET_RUNT(str, m) STAT_GENET_MIB(str, m, BCMGENET_STAT_RUNT)
513 
514 #define STAT_GENET_MISC(str, m, offset) { \
515         .stat_string = str, \
516         .stat_sizeof = sizeof(((struct bcmgenet_priv *)0)->m), \
517         .stat_offset = offsetof(struct bcmgenet_priv, m), \
518         .type = BCMGENET_STAT_MISC, \
519         .reg_offset = offset, \
520 }
521 
522 
523 /* There is a 0xC gap between the end of RX and beginning of TX stats and then
524  * between the end of TX stats and the beginning of the RX RUNT
525  */
526 #define BCMGENET_STAT_OFFSET    0xc
527 
528 /* Hardware counters must be kept in sync because the order/offset
529  * is important here (order in structure declaration = order in hardware)
530  */
531 static const struct bcmgenet_stats bcmgenet_gstrings_stats[] = {
532         /* general stats */
533         STAT_NETDEV(rx_packets),
534         STAT_NETDEV(tx_packets),
535         STAT_NETDEV(rx_bytes),
536         STAT_NETDEV(tx_bytes),
537         STAT_NETDEV(rx_errors),
538         STAT_NETDEV(tx_errors),
539         STAT_NETDEV(rx_dropped),
540         STAT_NETDEV(tx_dropped),
541         STAT_NETDEV(multicast),
542         /* UniMAC RSV counters */
543         STAT_GENET_MIB_RX("rx_64_octets", mib.rx.pkt_cnt.cnt_64),
544         STAT_GENET_MIB_RX("rx_65_127_oct", mib.rx.pkt_cnt.cnt_127),
545         STAT_GENET_MIB_RX("rx_128_255_oct", mib.rx.pkt_cnt.cnt_255),
546         STAT_GENET_MIB_RX("rx_256_511_oct", mib.rx.pkt_cnt.cnt_511),
547         STAT_GENET_MIB_RX("rx_512_1023_oct", mib.rx.pkt_cnt.cnt_1023),
548         STAT_GENET_MIB_RX("rx_1024_1518_oct", mib.rx.pkt_cnt.cnt_1518),
549         STAT_GENET_MIB_RX("rx_vlan_1519_1522_oct", mib.rx.pkt_cnt.cnt_mgv),
550         STAT_GENET_MIB_RX("rx_1522_2047_oct", mib.rx.pkt_cnt.cnt_2047),
551         STAT_GENET_MIB_RX("rx_2048_4095_oct", mib.rx.pkt_cnt.cnt_4095),
552         STAT_GENET_MIB_RX("rx_4096_9216_oct", mib.rx.pkt_cnt.cnt_9216),
553         STAT_GENET_MIB_RX("rx_pkts", mib.rx.pkt),
554         STAT_GENET_MIB_RX("rx_bytes", mib.rx.bytes),
555         STAT_GENET_MIB_RX("rx_multicast", mib.rx.mca),
556         STAT_GENET_MIB_RX("rx_broadcast", mib.rx.bca),
557         STAT_GENET_MIB_RX("rx_fcs", mib.rx.fcs),
558         STAT_GENET_MIB_RX("rx_control", mib.rx.cf),
559         STAT_GENET_MIB_RX("rx_pause", mib.rx.pf),
560         STAT_GENET_MIB_RX("rx_unknown", mib.rx.uo),
561         STAT_GENET_MIB_RX("rx_align", mib.rx.aln),
562         STAT_GENET_MIB_RX("rx_outrange", mib.rx.flr),
563         STAT_GENET_MIB_RX("rx_code", mib.rx.cde),
564         STAT_GENET_MIB_RX("rx_carrier", mib.rx.fcr),
565         STAT_GENET_MIB_RX("rx_oversize", mib.rx.ovr),
566         STAT_GENET_MIB_RX("rx_jabber", mib.rx.jbr),
567         STAT_GENET_MIB_RX("rx_mtu_err", mib.rx.mtue),
568         STAT_GENET_MIB_RX("rx_good_pkts", mib.rx.pok),
569         STAT_GENET_MIB_RX("rx_unicast", mib.rx.uc),
570         STAT_GENET_MIB_RX("rx_ppp", mib.rx.ppp),
571         STAT_GENET_MIB_RX("rx_crc", mib.rx.rcrc),
572         /* UniMAC TSV counters */
573         STAT_GENET_MIB_TX("tx_64_octets", mib.tx.pkt_cnt.cnt_64),
574         STAT_GENET_MIB_TX("tx_65_127_oct", mib.tx.pkt_cnt.cnt_127),
575         STAT_GENET_MIB_TX("tx_128_255_oct", mib.tx.pkt_cnt.cnt_255),
576         STAT_GENET_MIB_TX("tx_256_511_oct", mib.tx.pkt_cnt.cnt_511),
577         STAT_GENET_MIB_TX("tx_512_1023_oct", mib.tx.pkt_cnt.cnt_1023),
578         STAT_GENET_MIB_TX("tx_1024_1518_oct", mib.tx.pkt_cnt.cnt_1518),
579         STAT_GENET_MIB_TX("tx_vlan_1519_1522_oct", mib.tx.pkt_cnt.cnt_mgv),
580         STAT_GENET_MIB_TX("tx_1522_2047_oct", mib.tx.pkt_cnt.cnt_2047),
581         STAT_GENET_MIB_TX("tx_2048_4095_oct", mib.tx.pkt_cnt.cnt_4095),
582         STAT_GENET_MIB_TX("tx_4096_9216_oct", mib.tx.pkt_cnt.cnt_9216),
583         STAT_GENET_MIB_TX("tx_pkts", mib.tx.pkts),
584         STAT_GENET_MIB_TX("tx_multicast", mib.tx.mca),
585         STAT_GENET_MIB_TX("tx_broadcast", mib.tx.bca),
586         STAT_GENET_MIB_TX("tx_pause", mib.tx.pf),
587         STAT_GENET_MIB_TX("tx_control", mib.tx.cf),
588         STAT_GENET_MIB_TX("tx_fcs_err", mib.tx.fcs),
589         STAT_GENET_MIB_TX("tx_oversize", mib.tx.ovr),
590         STAT_GENET_MIB_TX("tx_defer", mib.tx.drf),
591         STAT_GENET_MIB_TX("tx_excess_defer", mib.tx.edf),
592         STAT_GENET_MIB_TX("tx_single_col", mib.tx.scl),
593         STAT_GENET_MIB_TX("tx_multi_col", mib.tx.mcl),
594         STAT_GENET_MIB_TX("tx_late_col", mib.tx.lcl),
595         STAT_GENET_MIB_TX("tx_excess_col", mib.tx.ecl),
596         STAT_GENET_MIB_TX("tx_frags", mib.tx.frg),
597         STAT_GENET_MIB_TX("tx_total_col", mib.tx.ncl),
598         STAT_GENET_MIB_TX("tx_jabber", mib.tx.jbr),
599         STAT_GENET_MIB_TX("tx_bytes", mib.tx.bytes),
600         STAT_GENET_MIB_TX("tx_good_pkts", mib.tx.pok),
601         STAT_GENET_MIB_TX("tx_unicast", mib.tx.uc),
602         /* UniMAC RUNT counters */
603         STAT_GENET_RUNT("rx_runt_pkts", mib.rx_runt_cnt),
604         STAT_GENET_RUNT("rx_runt_valid_fcs", mib.rx_runt_fcs),
605         STAT_GENET_RUNT("rx_runt_inval_fcs_align", mib.rx_runt_fcs_align),
606         STAT_GENET_RUNT("rx_runt_bytes", mib.rx_runt_bytes),
607         /* Misc UniMAC counters */
608         STAT_GENET_MISC("rbuf_ovflow_cnt", mib.rbuf_ovflow_cnt,
609                         UMAC_RBUF_OVFL_CNT),
610         STAT_GENET_MISC("rbuf_err_cnt", mib.rbuf_err_cnt, UMAC_RBUF_ERR_CNT),
611         STAT_GENET_MISC("mdf_err_cnt", mib.mdf_err_cnt, UMAC_MDF_ERR_CNT),
612 };
613 
614 #define BCMGENET_STATS_LEN      ARRAY_SIZE(bcmgenet_gstrings_stats)
615 
616 static void bcmgenet_get_drvinfo(struct net_device *dev,
617                                  struct ethtool_drvinfo *info)
618 {
619         strlcpy(info->driver, "bcmgenet", sizeof(info->driver));
620         strlcpy(info->version, "v2.0", sizeof(info->version));
621         info->n_stats = BCMGENET_STATS_LEN;
622 }
623 
624 static int bcmgenet_get_sset_count(struct net_device *dev, int string_set)
625 {
626         switch (string_set) {
627         case ETH_SS_STATS:
628                 return BCMGENET_STATS_LEN;
629         default:
630                 return -EOPNOTSUPP;
631         }
632 }
633 
634 static void bcmgenet_get_strings(struct net_device *dev, u32 stringset,
635                                  u8 *data)
636 {
637         int i;
638 
639         switch (stringset) {
640         case ETH_SS_STATS:
641                 for (i = 0; i < BCMGENET_STATS_LEN; i++) {
642                         memcpy(data + i * ETH_GSTRING_LEN,
643                                bcmgenet_gstrings_stats[i].stat_string,
644                                ETH_GSTRING_LEN);
645                 }
646                 break;
647         }
648 }
649 
650 static void bcmgenet_update_mib_counters(struct bcmgenet_priv *priv)
651 {
652         int i, j = 0;
653 
654         for (i = 0; i < BCMGENET_STATS_LEN; i++) {
655                 const struct bcmgenet_stats *s;
656                 u8 offset = 0;
657                 u32 val = 0;
658                 char *p;
659 
660                 s = &bcmgenet_gstrings_stats[i];
661                 switch (s->type) {
662                 case BCMGENET_STAT_NETDEV:
663                         continue;
664                 case BCMGENET_STAT_MIB_RX:
665                 case BCMGENET_STAT_MIB_TX:
666                 case BCMGENET_STAT_RUNT:
667                         if (s->type != BCMGENET_STAT_MIB_RX)
668                                 offset = BCMGENET_STAT_OFFSET;
669                         val = bcmgenet_umac_readl(priv,
670                                                   UMAC_MIB_START + j + offset);
671                         break;
672                 case BCMGENET_STAT_MISC:
673                         val = bcmgenet_umac_readl(priv, s->reg_offset);
674                         /* clear if overflowed */
675                         if (val == ~0)
676                                 bcmgenet_umac_writel(priv, 0, s->reg_offset);
677                         break;
678                 }
679 
680                 j += s->stat_sizeof;
681                 p = (char *)priv + s->stat_offset;
682                 *(u32 *)p = val;
683         }
684 }
685 
686 static void bcmgenet_get_ethtool_stats(struct net_device *dev,
687                                        struct ethtool_stats *stats,
688                                        u64 *data)
689 {
690         struct bcmgenet_priv *priv = netdev_priv(dev);
691         int i;
692 
693         if (netif_running(dev))
694                 bcmgenet_update_mib_counters(priv);
695 
696         for (i = 0; i < BCMGENET_STATS_LEN; i++) {
697                 const struct bcmgenet_stats *s;
698                 char *p;
699 
700                 s = &bcmgenet_gstrings_stats[i];
701                 if (s->type == BCMGENET_STAT_NETDEV)
702                         p = (char *)&dev->stats;
703                 else
704                         p = (char *)priv;
705                 p += s->stat_offset;
706                 data[i] = *(u32 *)p;
707         }
708 }
709 
710 /* standard ethtool support functions. */
711 static struct ethtool_ops bcmgenet_ethtool_ops = {
712         .get_strings            = bcmgenet_get_strings,
713         .get_sset_count         = bcmgenet_get_sset_count,
714         .get_ethtool_stats      = bcmgenet_get_ethtool_stats,
715         .get_settings           = bcmgenet_get_settings,
716         .set_settings           = bcmgenet_set_settings,
717         .get_drvinfo            = bcmgenet_get_drvinfo,
718         .get_link               = ethtool_op_get_link,
719         .get_msglevel           = bcmgenet_get_msglevel,
720         .set_msglevel           = bcmgenet_set_msglevel,
721         .get_wol                = bcmgenet_get_wol,
722         .set_wol                = bcmgenet_set_wol,
723 };
724 
725 /* Power down the unimac, based on mode. */
726 static void bcmgenet_power_down(struct bcmgenet_priv *priv,
727                                 enum bcmgenet_power_mode mode)
728 {
729         u32 reg;
730 
731         switch (mode) {
732         case GENET_POWER_CABLE_SENSE:
733                 phy_detach(priv->phydev);
734                 break;
735 
736         case GENET_POWER_WOL_MAGIC:
737                 bcmgenet_wol_power_down_cfg(priv, mode);
738                 break;
739 
740         case GENET_POWER_PASSIVE:
741                 /* Power down LED */
742                 if (priv->hw_params->flags & GENET_HAS_EXT) {
743                         reg = bcmgenet_ext_readl(priv, EXT_EXT_PWR_MGMT);
744                         reg |= (EXT_PWR_DOWN_PHY |
745                                 EXT_PWR_DOWN_DLL | EXT_PWR_DOWN_BIAS);
746                         bcmgenet_ext_writel(priv, reg, EXT_EXT_PWR_MGMT);
747                 }
748                 break;
749         default:
750                 break;
751         }
752 }
753 
754 static void bcmgenet_power_up(struct bcmgenet_priv *priv,
755                               enum bcmgenet_power_mode mode)
756 {
757         u32 reg;
758 
759         if (!(priv->hw_params->flags & GENET_HAS_EXT))
760                 return;
761 
762         reg = bcmgenet_ext_readl(priv, EXT_EXT_PWR_MGMT);
763 
764         switch (mode) {
765         case GENET_POWER_PASSIVE:
766                 reg &= ~(EXT_PWR_DOWN_DLL | EXT_PWR_DOWN_PHY |
767                                 EXT_PWR_DOWN_BIAS);
768                 /* fallthrough */
769         case GENET_POWER_CABLE_SENSE:
770                 /* enable APD */
771                 reg |= EXT_PWR_DN_EN_LD;
772                 break;
773         case GENET_POWER_WOL_MAGIC:
774                 bcmgenet_wol_power_up_cfg(priv, mode);
775                 return;
776         default:
777                 break;
778         }
779 
780         bcmgenet_ext_writel(priv, reg, EXT_EXT_PWR_MGMT);
781 
782         if (mode == GENET_POWER_PASSIVE)
783                 bcmgenet_mii_reset(priv->dev);
784 }
785 
786 /* ioctl handle special commands that are not present in ethtool. */
787 static int bcmgenet_ioctl(struct net_device *dev, struct ifreq *rq, int cmd)
788 {
789         struct bcmgenet_priv *priv = netdev_priv(dev);
790         int val = 0;
791 
792         if (!netif_running(dev))
793                 return -EINVAL;
794 
795         switch (cmd) {
796         case SIOCGMIIPHY:
797         case SIOCGMIIREG:
798         case SIOCSMIIREG:
799                 if (!priv->phydev)
800                         val = -ENODEV;
801                 else
802                         val = phy_mii_ioctl(priv->phydev, rq, cmd);
803                 break;
804 
805         default:
806                 val = -EINVAL;
807                 break;
808         }
809 
810         return val;
811 }
812 
813 static struct enet_cb *bcmgenet_get_txcb(struct bcmgenet_priv *priv,
814                                          struct bcmgenet_tx_ring *ring)
815 {
816         struct enet_cb *tx_cb_ptr;
817 
818         tx_cb_ptr = ring->cbs;
819         tx_cb_ptr += ring->write_ptr - ring->cb_ptr;
820         tx_cb_ptr->bd_addr = priv->tx_bds + ring->write_ptr * DMA_DESC_SIZE;
821         /* Advancing local write pointer */
822         if (ring->write_ptr == ring->end_ptr)
823                 ring->write_ptr = ring->cb_ptr;
824         else
825                 ring->write_ptr++;
826 
827         return tx_cb_ptr;
828 }
829 
830 /* Simple helper to free a control block's resources */
831 static void bcmgenet_free_cb(struct enet_cb *cb)
832 {
833         dev_kfree_skb_any(cb->skb);
834         cb->skb = NULL;
835         dma_unmap_addr_set(cb, dma_addr, 0);
836 }
837 
838 static inline void bcmgenet_tx_ring16_int_disable(struct bcmgenet_priv *priv,
839                                                   struct bcmgenet_tx_ring *ring)
840 {
841         bcmgenet_intrl2_0_writel(priv,
842                                  UMAC_IRQ_TXDMA_BDONE | UMAC_IRQ_TXDMA_PDONE,
843                                  INTRL2_CPU_MASK_SET);
844 }
845 
846 static inline void bcmgenet_tx_ring16_int_enable(struct bcmgenet_priv *priv,
847                                                  struct bcmgenet_tx_ring *ring)
848 {
849         bcmgenet_intrl2_0_writel(priv,
850                                  UMAC_IRQ_TXDMA_BDONE | UMAC_IRQ_TXDMA_PDONE,
851                                  INTRL2_CPU_MASK_CLEAR);
852 }
853 
854 static inline void bcmgenet_tx_ring_int_enable(struct bcmgenet_priv *priv,
855                                                struct bcmgenet_tx_ring *ring)
856 {
857         bcmgenet_intrl2_1_writel(priv, (1 << ring->index),
858                                  INTRL2_CPU_MASK_CLEAR);
859         priv->int1_mask &= ~(1 << ring->index);
860 }
861 
862 static inline void bcmgenet_tx_ring_int_disable(struct bcmgenet_priv *priv,
863                                                 struct bcmgenet_tx_ring *ring)
864 {
865         bcmgenet_intrl2_1_writel(priv, (1 << ring->index),
866                                  INTRL2_CPU_MASK_SET);
867         priv->int1_mask |= (1 << ring->index);
868 }
869 
870 /* Unlocked version of the reclaim routine */
871 static void __bcmgenet_tx_reclaim(struct net_device *dev,
872                                   struct bcmgenet_tx_ring *ring)
873 {
874         struct bcmgenet_priv *priv = netdev_priv(dev);
875         int last_tx_cn, last_c_index, num_tx_bds;
876         struct enet_cb *tx_cb_ptr;
877         struct netdev_queue *txq;
878         unsigned int bds_compl;
879         unsigned int c_index;
880 
881         /* Compute how many buffers are transmitted since last xmit call */
882         c_index = bcmgenet_tdma_ring_readl(priv, ring->index, TDMA_CONS_INDEX);
883         txq = netdev_get_tx_queue(dev, ring->queue);
884 
885         last_c_index = ring->c_index;
886         num_tx_bds = ring->size;
887 
888         c_index &= (num_tx_bds - 1);
889 
890         if (c_index >= last_c_index)
891                 last_tx_cn = c_index - last_c_index;
892         else
893                 last_tx_cn = num_tx_bds - last_c_index + c_index;
894 
895         netif_dbg(priv, tx_done, dev,
896                   "%s ring=%d index=%d last_tx_cn=%d last_index=%d\n",
897                   __func__, ring->index,
898                   c_index, last_tx_cn, last_c_index);
899 
900         /* Reclaim transmitted buffers */
901         while (last_tx_cn-- > 0) {
902                 tx_cb_ptr = ring->cbs + last_c_index;
903                 bds_compl = 0;
904                 if (tx_cb_ptr->skb) {
905                         bds_compl = skb_shinfo(tx_cb_ptr->skb)->nr_frags + 1;
906                         dev->stats.tx_bytes += tx_cb_ptr->skb->len;
907                         dma_unmap_single(&dev->dev,
908                                          dma_unmap_addr(tx_cb_ptr, dma_addr),
909                                          tx_cb_ptr->skb->len,
910                                          DMA_TO_DEVICE);
911                         bcmgenet_free_cb(tx_cb_ptr);
912                 } else if (dma_unmap_addr(tx_cb_ptr, dma_addr)) {
913                         dev->stats.tx_bytes +=
914                                 dma_unmap_len(tx_cb_ptr, dma_len);
915                         dma_unmap_page(&dev->dev,
916                                        dma_unmap_addr(tx_cb_ptr, dma_addr),
917                                        dma_unmap_len(tx_cb_ptr, dma_len),
918                                        DMA_TO_DEVICE);
919                         dma_unmap_addr_set(tx_cb_ptr, dma_addr, 0);
920                 }
921                 dev->stats.tx_packets++;
922                 ring->free_bds += bds_compl;
923 
924                 last_c_index++;
925                 last_c_index &= (num_tx_bds - 1);
926         }
927 
928         if (ring->free_bds > (MAX_SKB_FRAGS + 1))
929                 ring->int_disable(priv, ring);
930 
931         if (netif_tx_queue_stopped(txq))
932                 netif_tx_wake_queue(txq);
933 
934         ring->c_index = c_index;
935 }
936 
937 static void bcmgenet_tx_reclaim(struct net_device *dev,
938                                 struct bcmgenet_tx_ring *ring)
939 {
940         unsigned long flags;
941 
942         spin_lock_irqsave(&ring->lock, flags);
943         __bcmgenet_tx_reclaim(dev, ring);
944         spin_unlock_irqrestore(&ring->lock, flags);
945 }
946 
947 static void bcmgenet_tx_reclaim_all(struct net_device *dev)
948 {
949         struct bcmgenet_priv *priv = netdev_priv(dev);
950         int i;
951 
952         if (netif_is_multiqueue(dev)) {
953                 for (i = 0; i < priv->hw_params->tx_queues; i++)
954                         bcmgenet_tx_reclaim(dev, &priv->tx_rings[i]);
955         }
956 
957         bcmgenet_tx_reclaim(dev, &priv->tx_rings[DESC_INDEX]);
958 }
959 
960 /* Transmits a single SKB (either head of a fragment or a single SKB)
961  * caller must hold priv->lock
962  */
963 static int bcmgenet_xmit_single(struct net_device *dev,
964                                 struct sk_buff *skb,
965                                 u16 dma_desc_flags,
966                                 struct bcmgenet_tx_ring *ring)
967 {
968         struct bcmgenet_priv *priv = netdev_priv(dev);
969         struct device *kdev = &priv->pdev->dev;
970         struct enet_cb *tx_cb_ptr;
971         unsigned int skb_len;
972         dma_addr_t mapping;
973         u32 length_status;
974         int ret;
975 
976         tx_cb_ptr = bcmgenet_get_txcb(priv, ring);
977 
978         if (unlikely(!tx_cb_ptr))
979                 BUG();
980 
981         tx_cb_ptr->skb = skb;
982 
983         skb_len = skb_headlen(skb) < ETH_ZLEN ? ETH_ZLEN : skb_headlen(skb);
984 
985         mapping = dma_map_single(kdev, skb->data, skb_len, DMA_TO_DEVICE);
986         ret = dma_mapping_error(kdev, mapping);
987         if (ret) {
988                 netif_err(priv, tx_err, dev, "Tx DMA map failed\n");
989                 dev_kfree_skb(skb);
990                 return ret;
991         }
992 
993         dma_unmap_addr_set(tx_cb_ptr, dma_addr, mapping);
994         dma_unmap_len_set(tx_cb_ptr, dma_len, skb->len);
995         length_status = (skb_len << DMA_BUFLENGTH_SHIFT) | dma_desc_flags |
996                         (priv->hw_params->qtag_mask << DMA_TX_QTAG_SHIFT) |
997                         DMA_TX_APPEND_CRC;
998 
999         if (skb->ip_summed == CHECKSUM_PARTIAL)
1000                 length_status |= DMA_TX_DO_CSUM;
1001 
1002         dmadesc_set(priv, tx_cb_ptr->bd_addr, mapping, length_status);
1003 
1004         /* Decrement total BD count and advance our write pointer */
1005         ring->free_bds -= 1;
1006         ring->prod_index += 1;
1007         ring->prod_index &= DMA_P_INDEX_MASK;
1008 
1009         return 0;
1010 }
1011 
1012 /* Transmit a SKB fragment */
1013 static int bcmgenet_xmit_frag(struct net_device *dev,
1014                               skb_frag_t *frag,
1015                               u16 dma_desc_flags,
1016                               struct bcmgenet_tx_ring *ring)
1017 {
1018         struct bcmgenet_priv *priv = netdev_priv(dev);
1019         struct device *kdev = &priv->pdev->dev;
1020         struct enet_cb *tx_cb_ptr;
1021         dma_addr_t mapping;
1022         int ret;
1023 
1024         tx_cb_ptr = bcmgenet_get_txcb(priv, ring);
1025 
1026         if (unlikely(!tx_cb_ptr))
1027                 BUG();
1028         tx_cb_ptr->skb = NULL;
1029 
1030         mapping = skb_frag_dma_map(kdev, frag, 0,
1031                                    skb_frag_size(frag), DMA_TO_DEVICE);
1032         ret = dma_mapping_error(kdev, mapping);
1033         if (ret) {
1034                 netif_err(priv, tx_err, dev, "%s: Tx DMA map failed\n",
1035                           __func__);
1036                 return ret;
1037         }
1038 
1039         dma_unmap_addr_set(tx_cb_ptr, dma_addr, mapping);
1040         dma_unmap_len_set(tx_cb_ptr, dma_len, frag->size);
1041 
1042         dmadesc_set(priv, tx_cb_ptr->bd_addr, mapping,
1043                     (frag->size << DMA_BUFLENGTH_SHIFT) | dma_desc_flags |
1044                     (priv->hw_params->qtag_mask << DMA_TX_QTAG_SHIFT));
1045 
1046 
1047         ring->free_bds -= 1;
1048         ring->prod_index += 1;
1049         ring->prod_index &= DMA_P_INDEX_MASK;
1050 
1051         return 0;
1052 }
1053 
1054 /* Reallocate the SKB to put enough headroom in front of it and insert
1055  * the transmit checksum offsets in the descriptors
1056  */
1057 static int bcmgenet_put_tx_csum(struct net_device *dev, struct sk_buff *skb)
1058 {
1059         struct status_64 *status = NULL;
1060         struct sk_buff *new_skb;
1061         u16 offset;
1062         u8 ip_proto;
1063         u16 ip_ver;
1064         u32 tx_csum_info;
1065 
1066         if (unlikely(skb_headroom(skb) < sizeof(*status))) {
1067                 /* If 64 byte status block enabled, must make sure skb has
1068                  * enough headroom for us to insert 64B status block.
1069                  */
1070                 new_skb = skb_realloc_headroom(skb, sizeof(*status));
1071                 dev_kfree_skb(skb);
1072                 if (!new_skb) {
1073                         dev->stats.tx_errors++;
1074                         dev->stats.tx_dropped++;
1075                         return -ENOMEM;
1076                 }
1077                 skb = new_skb;
1078         }
1079 
1080         skb_push(skb, sizeof(*status));
1081         status = (struct status_64 *)skb->data;
1082 
1083         if (skb->ip_summed  == CHECKSUM_PARTIAL) {
1084                 ip_ver = htons(skb->protocol);
1085                 switch (ip_ver) {
1086                 case ETH_P_IP:
1087                         ip_proto = ip_hdr(skb)->protocol;
1088                         break;
1089                 case ETH_P_IPV6:
1090                         ip_proto = ipv6_hdr(skb)->nexthdr;
1091                         break;
1092                 default:
1093                         return 0;
1094                 }
1095 
1096                 offset = skb_checksum_start_offset(skb) - sizeof(*status);
1097                 tx_csum_info = (offset << STATUS_TX_CSUM_START_SHIFT) |
1098                                 (offset + skb->csum_offset);
1099 
1100                 /* Set the length valid bit for TCP and UDP and just set
1101                  * the special UDP flag for IPv4, else just set to 0.
1102                  */
1103                 if (ip_proto == IPPROTO_TCP || ip_proto == IPPROTO_UDP) {
1104                         tx_csum_info |= STATUS_TX_CSUM_LV;
1105                         if (ip_proto == IPPROTO_UDP && ip_ver == ETH_P_IP)
1106                                 tx_csum_info |= STATUS_TX_CSUM_PROTO_UDP;
1107                 } else {
1108                         tx_csum_info = 0;
1109                 }
1110 
1111                 status->tx_csum_info = tx_csum_info;
1112         }
1113 
1114         return 0;
1115 }
1116 
1117 static netdev_tx_t bcmgenet_xmit(struct sk_buff *skb, struct net_device *dev)
1118 {
1119         struct bcmgenet_priv *priv = netdev_priv(dev);
1120         struct bcmgenet_tx_ring *ring = NULL;
1121         struct netdev_queue *txq;
1122         unsigned long flags = 0;
1123         int nr_frags, index;
1124         u16 dma_desc_flags;
1125         int ret;
1126         int i;
1127 
1128         index = skb_get_queue_mapping(skb);
1129         /* Mapping strategy:
1130          * queue_mapping = 0, unclassified, packet xmited through ring16
1131          * queue_mapping = 1, goes to ring 0. (highest priority queue
1132          * queue_mapping = 2, goes to ring 1.
1133          * queue_mapping = 3, goes to ring 2.
1134          * queue_mapping = 4, goes to ring 3.
1135          */
1136         if (index == 0)
1137                 index = DESC_INDEX;
1138         else
1139                 index -= 1;
1140 
1141         nr_frags = skb_shinfo(skb)->nr_frags;
1142         ring = &priv->tx_rings[index];
1143         txq = netdev_get_tx_queue(dev, ring->queue);
1144 
1145         spin_lock_irqsave(&ring->lock, flags);
1146         if (ring->free_bds <= nr_frags + 1) {
1147                 netif_tx_stop_queue(txq);
1148                 netdev_err(dev, "%s: tx ring %d full when queue %d awake\n",
1149                            __func__, index, ring->queue);
1150                 ret = NETDEV_TX_BUSY;
1151                 goto out;
1152         }
1153 
1154         if (skb_padto(skb, ETH_ZLEN)) {
1155                 ret = NETDEV_TX_OK;
1156                 goto out;
1157         }
1158 
1159         /* set the SKB transmit checksum */
1160         if (priv->desc_64b_en) {
1161                 ret = bcmgenet_put_tx_csum(dev, skb);
1162                 if (ret) {
1163                         ret = NETDEV_TX_OK;
1164                         goto out;
1165                 }
1166         }
1167 
1168         dma_desc_flags = DMA_SOP;
1169         if (nr_frags == 0)
1170                 dma_desc_flags |= DMA_EOP;
1171 
1172         /* Transmit single SKB or head of fragment list */
1173         ret = bcmgenet_xmit_single(dev, skb, dma_desc_flags, ring);
1174         if (ret) {
1175                 ret = NETDEV_TX_OK;
1176                 goto out;
1177         }
1178 
1179         /* xmit fragment */
1180         for (i = 0; i < nr_frags; i++) {
1181                 ret = bcmgenet_xmit_frag(dev,
1182                                          &skb_shinfo(skb)->frags[i],
1183                                          (i == nr_frags - 1) ? DMA_EOP : 0,
1184                                          ring);
1185                 if (ret) {
1186                         ret = NETDEV_TX_OK;
1187                         goto out;
1188                 }
1189         }
1190 
1191         skb_tx_timestamp(skb);
1192 
1193         /* we kept a software copy of how much we should advance the TDMA
1194          * producer index, now write it down to the hardware
1195          */
1196         bcmgenet_tdma_ring_writel(priv, ring->index,
1197                                   ring->prod_index, TDMA_PROD_INDEX);
1198 
1199         if (ring->free_bds <= (MAX_SKB_FRAGS + 1)) {
1200                 netif_tx_stop_queue(txq);
1201                 ring->int_enable(priv, ring);
1202         }
1203 
1204 out:
1205         spin_unlock_irqrestore(&ring->lock, flags);
1206 
1207         return ret;
1208 }
1209 
1210 
1211 static int bcmgenet_rx_refill(struct bcmgenet_priv *priv, struct enet_cb *cb)
1212 {
1213         struct device *kdev = &priv->pdev->dev;
1214         struct sk_buff *skb;
1215         dma_addr_t mapping;
1216         int ret;
1217 
1218         skb = netdev_alloc_skb(priv->dev, priv->rx_buf_len + SKB_ALIGNMENT);
1219         if (!skb)
1220                 return -ENOMEM;
1221 
1222         /* a caller did not release this control block */
1223         WARN_ON(cb->skb != NULL);
1224         cb->skb = skb;
1225         mapping = dma_map_single(kdev, skb->data,
1226                                  priv->rx_buf_len, DMA_FROM_DEVICE);
1227         ret = dma_mapping_error(kdev, mapping);
1228         if (ret) {
1229                 bcmgenet_free_cb(cb);
1230                 netif_err(priv, rx_err, priv->dev,
1231                           "%s DMA map failed\n", __func__);
1232                 return ret;
1233         }
1234 
1235         dma_unmap_addr_set(cb, dma_addr, mapping);
1236         /* assign packet, prepare descriptor, and advance pointer */
1237 
1238         dmadesc_set_addr(priv, priv->rx_bd_assign_ptr, mapping);
1239 
1240         /* turn on the newly assigned BD for DMA to use */
1241         priv->rx_bd_assign_index++;
1242         priv->rx_bd_assign_index &= (priv->num_rx_bds - 1);
1243 
1244         priv->rx_bd_assign_ptr = priv->rx_bds +
1245                 (priv->rx_bd_assign_index * DMA_DESC_SIZE);
1246 
1247         return 0;
1248 }
1249 
1250 /* bcmgenet_desc_rx - descriptor based rx process.
1251  * this could be called from bottom half, or from NAPI polling method.
1252  */
1253 static unsigned int bcmgenet_desc_rx(struct bcmgenet_priv *priv,
1254                                      unsigned int budget)
1255 {
1256         struct net_device *dev = priv->dev;
1257         struct enet_cb *cb;
1258         struct sk_buff *skb;
1259         u32 dma_length_status;
1260         unsigned long dma_flag;
1261         int len, err;
1262         unsigned int rxpktprocessed = 0, rxpkttoprocess;
1263         unsigned int p_index;
1264         unsigned int chksum_ok = 0;
1265 
1266         p_index = bcmgenet_rdma_ring_readl(priv, DESC_INDEX, RDMA_PROD_INDEX);
1267         p_index &= DMA_P_INDEX_MASK;
1268 
1269         if (p_index < priv->rx_c_index)
1270                 rxpkttoprocess = (DMA_C_INDEX_MASK + 1) -
1271                         priv->rx_c_index + p_index;
1272         else
1273                 rxpkttoprocess = p_index - priv->rx_c_index;
1274 
1275         netif_dbg(priv, rx_status, dev,
1276                   "RDMA: rxpkttoprocess=%d\n", rxpkttoprocess);
1277 
1278         while ((rxpktprocessed < rxpkttoprocess) &&
1279                (rxpktprocessed < budget)) {
1280                 cb = &priv->rx_cbs[priv->rx_read_ptr];
1281                 skb = cb->skb;
1282 
1283                 rxpktprocessed++;
1284 
1285                 priv->rx_read_ptr++;
1286                 priv->rx_read_ptr &= (priv->num_rx_bds - 1);
1287 
1288                 /* We do not have a backing SKB, so we do not have a
1289                  * corresponding DMA mapping for this incoming packet since
1290                  * bcmgenet_rx_refill always either has both skb and mapping or
1291                  * none.
1292                  */
1293                 if (unlikely(!skb)) {
1294                         dev->stats.rx_dropped++;
1295                         dev->stats.rx_errors++;
1296                         goto refill;
1297                 }
1298 
1299                 /* Unmap the packet contents such that we can use the
1300                  * RSV from the 64 bytes descriptor when enabled and save
1301                  * a 32-bits register read
1302                  */
1303                 dma_unmap_single(&dev->dev, dma_unmap_addr(cb, dma_addr),
1304                                  priv->rx_buf_len, DMA_FROM_DEVICE);
1305 
1306                 if (!priv->desc_64b_en) {
1307                         dma_length_status =
1308                                 dmadesc_get_length_status(priv,
1309                                                           priv->rx_bds +
1310                                                           (priv->rx_read_ptr *
1311                                                            DMA_DESC_SIZE));
1312                 } else {
1313                         struct status_64 *status;
1314 
1315                         status = (struct status_64 *)skb->data;
1316                         dma_length_status = status->length_status;
1317                 }
1318 
1319                 /* DMA flags and length are still valid no matter how
1320                  * we got the Receive Status Vector (64B RSB or register)
1321                  */
1322                 dma_flag = dma_length_status & 0xffff;
1323                 len = dma_length_status >> DMA_BUFLENGTH_SHIFT;
1324 
1325                 netif_dbg(priv, rx_status, dev,
1326                           "%s:p_ind=%d c_ind=%d read_ptr=%d len_stat=0x%08x\n",
1327                           __func__, p_index, priv->rx_c_index,
1328                           priv->rx_read_ptr, dma_length_status);
1329 
1330                 if (unlikely(!(dma_flag & DMA_EOP) || !(dma_flag & DMA_SOP))) {
1331                         netif_err(priv, rx_status, dev,
1332                                   "dropping fragmented packet!\n");
1333                         dev->stats.rx_dropped++;
1334                         dev->stats.rx_errors++;
1335                         dev_kfree_skb_any(cb->skb);
1336                         cb->skb = NULL;
1337                         goto refill;
1338                 }
1339                 /* report errors */
1340                 if (unlikely(dma_flag & (DMA_RX_CRC_ERROR |
1341                                                 DMA_RX_OV |
1342                                                 DMA_RX_NO |
1343                                                 DMA_RX_LG |
1344                                                 DMA_RX_RXER))) {
1345                         netif_err(priv, rx_status, dev, "dma_flag=0x%x\n",
1346                                   (unsigned int)dma_flag);
1347                         if (dma_flag & DMA_RX_CRC_ERROR)
1348                                 dev->stats.rx_crc_errors++;
1349                         if (dma_flag & DMA_RX_OV)
1350                                 dev->stats.rx_over_errors++;
1351                         if (dma_flag & DMA_RX_NO)
1352                                 dev->stats.rx_frame_errors++;
1353                         if (dma_flag & DMA_RX_LG)
1354                                 dev->stats.rx_length_errors++;
1355                         dev->stats.rx_dropped++;
1356                         dev->stats.rx_errors++;
1357 
1358                         /* discard the packet and advance consumer index.*/
1359                         dev_kfree_skb_any(cb->skb);
1360                         cb->skb = NULL;
1361                         goto refill;
1362                 } /* error packet */
1363 
1364                 chksum_ok = (dma_flag & priv->dma_rx_chk_bit) &&
1365                              priv->desc_rxchk_en;
1366 
1367                 skb_put(skb, len);
1368                 if (priv->desc_64b_en) {
1369                         skb_pull(skb, 64);
1370                         len -= 64;
1371                 }
1372 
1373                 if (likely(chksum_ok))
1374                         skb->ip_summed = CHECKSUM_UNNECESSARY;
1375 
1376                 /* remove hardware 2bytes added for IP alignment */
1377                 skb_pull(skb, 2);
1378                 len -= 2;
1379 
1380                 if (priv->crc_fwd_en) {
1381                         skb_trim(skb, len - ETH_FCS_LEN);
1382                         len -= ETH_FCS_LEN;
1383                 }
1384 
1385                 /*Finish setting up the received SKB and send it to the kernel*/
1386                 skb->protocol = eth_type_trans(skb, priv->dev);
1387                 dev->stats.rx_packets++;
1388                 dev->stats.rx_bytes += len;
1389                 if (dma_flag & DMA_RX_MULT)
1390                         dev->stats.multicast++;
1391 
1392                 /* Notify kernel */
1393                 napi_gro_receive(&priv->napi, skb);
1394                 cb->skb = NULL;
1395                 netif_dbg(priv, rx_status, dev, "pushed up to kernel\n");
1396 
1397                 /* refill RX path on the current control block */
1398 refill:
1399                 err = bcmgenet_rx_refill(priv, cb);
1400                 if (err)
1401                         netif_err(priv, rx_err, dev, "Rx refill failed\n");
1402         }
1403 
1404         return rxpktprocessed;
1405 }
1406 
1407 /* Assign skb to RX DMA descriptor. */
1408 static int bcmgenet_alloc_rx_buffers(struct bcmgenet_priv *priv)
1409 {
1410         struct enet_cb *cb;
1411         int ret = 0;
1412         int i;
1413 
1414         netif_dbg(priv, hw, priv->dev, "%s:\n", __func__);
1415 
1416         /* loop here for each buffer needing assign */
1417         for (i = 0; i < priv->num_rx_bds; i++) {
1418                 cb = &priv->rx_cbs[priv->rx_bd_assign_index];
1419                 if (cb->skb)
1420                         continue;
1421 
1422                 ret = bcmgenet_rx_refill(priv, cb);
1423                 if (ret)
1424                         break;
1425         }
1426 
1427         return ret;
1428 }
1429 
1430 static void bcmgenet_free_rx_buffers(struct bcmgenet_priv *priv)
1431 {
1432         struct enet_cb *cb;
1433         int i;
1434 
1435         for (i = 0; i < priv->num_rx_bds; i++) {
1436                 cb = &priv->rx_cbs[i];
1437 
1438                 if (dma_unmap_addr(cb, dma_addr)) {
1439                         dma_unmap_single(&priv->dev->dev,
1440                                          dma_unmap_addr(cb, dma_addr),
1441                                          priv->rx_buf_len, DMA_FROM_DEVICE);
1442                         dma_unmap_addr_set(cb, dma_addr, 0);
1443                 }
1444 
1445                 if (cb->skb)
1446                         bcmgenet_free_cb(cb);
1447         }
1448 }
1449 
1450 static void umac_enable_set(struct bcmgenet_priv *priv, u32 mask, bool enable)
1451 {
1452         u32 reg;
1453 
1454         reg = bcmgenet_umac_readl(priv, UMAC_CMD);
1455         if (enable)
1456                 reg |= mask;
1457         else
1458                 reg &= ~mask;
1459         bcmgenet_umac_writel(priv, reg, UMAC_CMD);
1460 
1461         /* UniMAC stops on a packet boundary, wait for a full-size packet
1462          * to be processed
1463          */
1464         if (enable == 0)
1465                 usleep_range(1000, 2000);
1466 }
1467 
1468 static int reset_umac(struct bcmgenet_priv *priv)
1469 {
1470         struct device *kdev = &priv->pdev->dev;
1471         unsigned int timeout = 0;
1472         u32 reg;
1473 
1474         /* 7358a0/7552a0: bad default in RBUF_FLUSH_CTRL.umac_sw_rst */
1475         bcmgenet_rbuf_ctrl_set(priv, 0);
1476         udelay(10);
1477 
1478         /* disable MAC while updating its registers */
1479         bcmgenet_umac_writel(priv, 0, UMAC_CMD);
1480 
1481         /* issue soft reset, wait for it to complete */
1482         bcmgenet_umac_writel(priv, CMD_SW_RESET, UMAC_CMD);
1483         while (timeout++ < 1000) {
1484                 reg = bcmgenet_umac_readl(priv, UMAC_CMD);
1485                 if (!(reg & CMD_SW_RESET))
1486                         return 0;
1487 
1488                 udelay(1);
1489         }
1490 
1491         if (timeout == 1000) {
1492                 dev_err(kdev,
1493                         "timeout waiting for MAC to come out of reset\n");
1494                 return -ETIMEDOUT;
1495         }
1496 
1497         return 0;
1498 }
1499 
1500 static void bcmgenet_intr_disable(struct bcmgenet_priv *priv)
1501 {
1502         /* Mask all interrupts.*/
1503         bcmgenet_intrl2_0_writel(priv, 0xFFFFFFFF, INTRL2_CPU_MASK_SET);
1504         bcmgenet_intrl2_0_writel(priv, 0xFFFFFFFF, INTRL2_CPU_CLEAR);
1505         bcmgenet_intrl2_0_writel(priv, 0, INTRL2_CPU_MASK_CLEAR);
1506         bcmgenet_intrl2_1_writel(priv, 0xFFFFFFFF, INTRL2_CPU_MASK_SET);
1507         bcmgenet_intrl2_1_writel(priv, 0xFFFFFFFF, INTRL2_CPU_CLEAR);
1508         bcmgenet_intrl2_1_writel(priv, 0, INTRL2_CPU_MASK_CLEAR);
1509 }
1510 
1511 static int init_umac(struct bcmgenet_priv *priv)
1512 {
1513         struct device *kdev = &priv->pdev->dev;
1514         int ret;
1515         u32 reg, cpu_mask_clear;
1516 
1517         dev_dbg(&priv->pdev->dev, "bcmgenet: init_umac\n");
1518 
1519         ret = reset_umac(priv);
1520         if (ret)
1521                 return ret;
1522 
1523         bcmgenet_umac_writel(priv, 0, UMAC_CMD);
1524         /* clear tx/rx counter */
1525         bcmgenet_umac_writel(priv,
1526                              MIB_RESET_RX | MIB_RESET_TX | MIB_RESET_RUNT,
1527                              UMAC_MIB_CTRL);
1528         bcmgenet_umac_writel(priv, 0, UMAC_MIB_CTRL);
1529 
1530         bcmgenet_umac_writel(priv, ENET_MAX_MTU_SIZE, UMAC_MAX_FRAME_LEN);
1531 
1532         /* init rx registers, enable ip header optimization */
1533         reg = bcmgenet_rbuf_readl(priv, RBUF_CTRL);
1534         reg |= RBUF_ALIGN_2B;
1535         bcmgenet_rbuf_writel(priv, reg, RBUF_CTRL);
1536 
1537         if (!GENET_IS_V1(priv) && !GENET_IS_V2(priv))
1538                 bcmgenet_rbuf_writel(priv, 1, RBUF_TBUF_SIZE_CTRL);
1539 
1540         bcmgenet_intr_disable(priv);
1541 
1542         cpu_mask_clear = UMAC_IRQ_RXDMA_BDONE;
1543 
1544         dev_dbg(kdev, "%s:Enabling RXDMA_BDONE interrupt\n", __func__);
1545 
1546         /* Monitor cable plug/unplugged event for internal PHY */
1547         if (phy_is_internal(priv->phydev)) {
1548                 cpu_mask_clear |= (UMAC_IRQ_LINK_DOWN | UMAC_IRQ_LINK_UP);
1549         } else if (priv->ext_phy) {
1550                 cpu_mask_clear |= (UMAC_IRQ_LINK_DOWN | UMAC_IRQ_LINK_UP);
1551         } else if (priv->phy_interface == PHY_INTERFACE_MODE_MOCA) {
1552                 reg = bcmgenet_bp_mc_get(priv);
1553                 reg |= BIT(priv->hw_params->bp_in_en_shift);
1554 
1555                 /* bp_mask: back pressure mask */
1556                 if (netif_is_multiqueue(priv->dev))
1557                         reg |= priv->hw_params->bp_in_mask;
1558                 else
1559                         reg &= ~priv->hw_params->bp_in_mask;
1560                 bcmgenet_bp_mc_set(priv, reg);
1561         }
1562 
1563         /* Enable MDIO interrupts on GENET v3+ */
1564         if (priv->hw_params->flags & GENET_HAS_MDIO_INTR)
1565                 cpu_mask_clear |= UMAC_IRQ_MDIO_DONE | UMAC_IRQ_MDIO_ERROR;
1566 
1567         bcmgenet_intrl2_0_writel(priv, cpu_mask_clear, INTRL2_CPU_MASK_CLEAR);
1568 
1569         /* Enable rx/tx engine.*/
1570         dev_dbg(kdev, "done init umac\n");
1571 
1572         return 0;
1573 }
1574 
1575 /* Initialize all house-keeping variables for a TX ring, along
1576  * with corresponding hardware registers
1577  */
1578 static void bcmgenet_init_tx_ring(struct bcmgenet_priv *priv,
1579                                   unsigned int index, unsigned int size,
1580                                   unsigned int write_ptr, unsigned int end_ptr)
1581 {
1582         struct bcmgenet_tx_ring *ring = &priv->tx_rings[index];
1583         u32 words_per_bd = WORDS_PER_BD(priv);
1584         u32 flow_period_val = 0;
1585         unsigned int first_bd;
1586 
1587         spin_lock_init(&ring->lock);
1588         ring->index = index;
1589         if (index == DESC_INDEX) {
1590                 ring->queue = 0;
1591                 ring->int_enable = bcmgenet_tx_ring16_int_enable;
1592                 ring->int_disable = bcmgenet_tx_ring16_int_disable;
1593         } else {
1594                 ring->queue = index + 1;
1595                 ring->int_enable = bcmgenet_tx_ring_int_enable;
1596                 ring->int_disable = bcmgenet_tx_ring_int_disable;
1597         }
1598         ring->cbs = priv->tx_cbs + write_ptr;
1599         ring->size = size;
1600         ring->c_index = 0;
1601         ring->free_bds = size;
1602         ring->write_ptr = write_ptr;
1603         ring->cb_ptr = write_ptr;
1604         ring->end_ptr = end_ptr - 1;
1605         ring->prod_index = 0;
1606 
1607         /* Set flow period for ring != 16 */
1608         if (index != DESC_INDEX)
1609                 flow_period_val = ENET_MAX_MTU_SIZE << 16;
1610 
1611         bcmgenet_tdma_ring_writel(priv, index, 0, TDMA_PROD_INDEX);
1612         bcmgenet_tdma_ring_writel(priv, index, 0, TDMA_CONS_INDEX);
1613         bcmgenet_tdma_ring_writel(priv, index, 1, DMA_MBUF_DONE_THRESH);
1614         /* Disable rate control for now */
1615         bcmgenet_tdma_ring_writel(priv, index, flow_period_val,
1616                                   TDMA_FLOW_PERIOD);
1617         /* Unclassified traffic goes to ring 16 */
1618         bcmgenet_tdma_ring_writel(priv, index,
1619                                   ((size << DMA_RING_SIZE_SHIFT) |
1620                                    RX_BUF_LENGTH), DMA_RING_BUF_SIZE);
1621 
1622         first_bd = write_ptr;
1623 
1624         /* Set start and end address, read and write pointers */
1625         bcmgenet_tdma_ring_writel(priv, index, first_bd * words_per_bd,
1626                                   DMA_START_ADDR);
1627         bcmgenet_tdma_ring_writel(priv, index, first_bd * words_per_bd,
1628                                   TDMA_READ_PTR);
1629         bcmgenet_tdma_ring_writel(priv, index, first_bd,
1630                                   TDMA_WRITE_PTR);
1631         bcmgenet_tdma_ring_writel(priv, index, end_ptr * words_per_bd - 1,
1632                                   DMA_END_ADDR);
1633 }
1634 
1635 /* Initialize a RDMA ring */
1636 static int bcmgenet_init_rx_ring(struct bcmgenet_priv *priv,
1637                                  unsigned int index, unsigned int size)
1638 {
1639         u32 words_per_bd = WORDS_PER_BD(priv);
1640         int ret;
1641 
1642         priv->num_rx_bds = TOTAL_DESC;
1643         priv->rx_bds = priv->base + priv->hw_params->rdma_offset;
1644         priv->rx_bd_assign_ptr = priv->rx_bds;
1645         priv->rx_bd_assign_index = 0;
1646         priv->rx_c_index = 0;
1647         priv->rx_read_ptr = 0;
1648         priv->rx_cbs = kcalloc(priv->num_rx_bds, sizeof(struct enet_cb),
1649                                GFP_KERNEL);
1650         if (!priv->rx_cbs)
1651                 return -ENOMEM;
1652 
1653         ret = bcmgenet_alloc_rx_buffers(priv);
1654         if (ret) {
1655                 kfree(priv->rx_cbs);
1656                 return ret;
1657         }
1658 
1659         bcmgenet_rdma_ring_writel(priv, index, 0, RDMA_WRITE_PTR);
1660         bcmgenet_rdma_ring_writel(priv, index, 0, RDMA_PROD_INDEX);
1661         bcmgenet_rdma_ring_writel(priv, index, 0, RDMA_CONS_INDEX);
1662         bcmgenet_rdma_ring_writel(priv, index,
1663                                   ((size << DMA_RING_SIZE_SHIFT) |
1664                                    RX_BUF_LENGTH), DMA_RING_BUF_SIZE);
1665         bcmgenet_rdma_ring_writel(priv, index, 0, DMA_START_ADDR);
1666         bcmgenet_rdma_ring_writel(priv, index,
1667                                   words_per_bd * size - 1, DMA_END_ADDR);
1668         bcmgenet_rdma_ring_writel(priv, index,
1669                                   (DMA_FC_THRESH_LO <<
1670                                    DMA_XOFF_THRESHOLD_SHIFT) |
1671                                    DMA_FC_THRESH_HI, RDMA_XON_XOFF_THRESH);
1672         bcmgenet_rdma_ring_writel(priv, index, 0, RDMA_READ_PTR);
1673 
1674         return ret;
1675 }
1676 
1677 /* init multi xmit queues, only available for GENET2+
1678  * the queue is partitioned as follows:
1679  *
1680  * queue 0 - 3 is priority based, each one has 32 descriptors,
1681  * with queue 0 being the highest priority queue.
1682  *
1683  * queue 16 is the default tx queue with GENET_DEFAULT_BD_CNT
1684  * descriptors: 256 - (number of tx queues * bds per queues) = 128
1685  * descriptors.
1686  *
1687  * The transmit control block pool is then partitioned as following:
1688  * - tx_cbs[0...127] are for queue 16
1689  * - tx_ring_cbs[0] points to tx_cbs[128..159]
1690  * - tx_ring_cbs[1] points to tx_cbs[160..191]
1691  * - tx_ring_cbs[2] points to tx_cbs[192..223]
1692  * - tx_ring_cbs[3] points to tx_cbs[224..255]
1693  */
1694 static void bcmgenet_init_multiq(struct net_device *dev)
1695 {
1696         struct bcmgenet_priv *priv = netdev_priv(dev);
1697         unsigned int i, dma_enable;
1698         u32 reg, dma_ctrl, ring_cfg = 0, dma_priority = 0;
1699 
1700         if (!netif_is_multiqueue(dev)) {
1701                 netdev_warn(dev, "called with non multi queue aware HW\n");
1702                 return;
1703         }
1704 
1705         dma_ctrl = bcmgenet_tdma_readl(priv, DMA_CTRL);
1706         dma_enable = dma_ctrl & DMA_EN;
1707         dma_ctrl &= ~DMA_EN;
1708         bcmgenet_tdma_writel(priv, dma_ctrl, DMA_CTRL);
1709 
1710         /* Enable strict priority arbiter mode */
1711         bcmgenet_tdma_writel(priv, DMA_ARBITER_SP, DMA_ARB_CTRL);
1712 
1713         for (i = 0; i < priv->hw_params->tx_queues; i++) {
1714                 /* first 64 tx_cbs are reserved for default tx queue
1715                  * (ring 16)
1716                  */
1717                 bcmgenet_init_tx_ring(priv, i, priv->hw_params->bds_cnt,
1718                                       i * priv->hw_params->bds_cnt,
1719                                       (i + 1) * priv->hw_params->bds_cnt);
1720 
1721                 /* Configure ring as descriptor ring and setup priority */
1722                 ring_cfg |= 1 << i;
1723                 dma_priority |= ((GENET_Q0_PRIORITY + i) <<
1724                                 (GENET_MAX_MQ_CNT + 1) * i);
1725                 dma_ctrl |= 1 << (i + DMA_RING_BUF_EN_SHIFT);
1726         }
1727 
1728         /* Enable rings */
1729         reg = bcmgenet_tdma_readl(priv, DMA_RING_CFG);
1730         reg |= ring_cfg;
1731         bcmgenet_tdma_writel(priv, reg, DMA_RING_CFG);
1732 
1733         /* Use configured rings priority and set ring #16 priority */
1734         reg = bcmgenet_tdma_readl(priv, DMA_RING_PRIORITY);
1735         reg |= ((GENET_Q0_PRIORITY + priv->hw_params->tx_queues) << 20);
1736         reg |= dma_priority;
1737         bcmgenet_tdma_writel(priv, reg, DMA_PRIORITY);
1738 
1739         /* Configure ring as descriptor ring and re-enable DMA if enabled */
1740         reg = bcmgenet_tdma_readl(priv, DMA_CTRL);
1741         reg |= dma_ctrl;
1742         if (dma_enable)
1743                 reg |= DMA_EN;
1744         bcmgenet_tdma_writel(priv, reg, DMA_CTRL);
1745 }
1746 
1747 static int bcmgenet_dma_teardown(struct bcmgenet_priv *priv)
1748 {
1749         int ret = 0;
1750         int timeout = 0;
1751         u32 reg;
1752 
1753         /* Disable TDMA to stop add more frames in TX DMA */
1754         reg = bcmgenet_tdma_readl(priv, DMA_CTRL);
1755         reg &= ~DMA_EN;
1756         bcmgenet_tdma_writel(priv, reg, DMA_CTRL);
1757 
1758         /* Check TDMA status register to confirm TDMA is disabled */
1759         while (timeout++ < DMA_TIMEOUT_VAL) {
1760                 reg = bcmgenet_tdma_readl(priv, DMA_STATUS);
1761                 if (reg & DMA_DISABLED)
1762                         break;
1763 
1764                 udelay(1);
1765         }
1766 
1767         if (timeout == DMA_TIMEOUT_VAL) {
1768                 netdev_warn(priv->dev, "Timed out while disabling TX DMA\n");
1769                 ret = -ETIMEDOUT;
1770         }
1771 
1772         /* Wait 10ms for packet drain in both tx and rx dma */
1773         usleep_range(10000, 20000);
1774 
1775         /* Disable RDMA */
1776         reg = bcmgenet_rdma_readl(priv, DMA_CTRL);
1777         reg &= ~DMA_EN;
1778         bcmgenet_rdma_writel(priv, reg, DMA_CTRL);
1779 
1780         timeout = 0;
1781         /* Check RDMA status register to confirm RDMA is disabled */
1782         while (timeout++ < DMA_TIMEOUT_VAL) {
1783                 reg = bcmgenet_rdma_readl(priv, DMA_STATUS);
1784                 if (reg & DMA_DISABLED)
1785                         break;
1786 
1787                 udelay(1);
1788         }
1789 
1790         if (timeout == DMA_TIMEOUT_VAL) {
1791                 netdev_warn(priv->dev, "Timed out while disabling RX DMA\n");
1792                 ret = -ETIMEDOUT;
1793         }
1794 
1795         return ret;
1796 }
1797 
1798 static void bcmgenet_fini_dma(struct bcmgenet_priv *priv)
1799 {
1800         int i;
1801 
1802         /* disable DMA */
1803         bcmgenet_dma_teardown(priv);
1804 
1805         for (i = 0; i < priv->num_tx_bds; i++) {
1806                 if (priv->tx_cbs[i].skb != NULL) {
1807                         dev_kfree_skb(priv->tx_cbs[i].skb);
1808                         priv->tx_cbs[i].skb = NULL;
1809                 }
1810         }
1811 
1812         bcmgenet_free_rx_buffers(priv);
1813         kfree(priv->rx_cbs);
1814         kfree(priv->tx_cbs);
1815 }
1816 
1817 /* init_edma: Initialize DMA control register */
1818 static int bcmgenet_init_dma(struct bcmgenet_priv *priv)
1819 {
1820         int ret;
1821 
1822         netif_dbg(priv, hw, priv->dev, "bcmgenet: init_edma\n");
1823 
1824         /* by default, enable ring 16 (descriptor based) */
1825         ret = bcmgenet_init_rx_ring(priv, DESC_INDEX, TOTAL_DESC);
1826         if (ret) {
1827                 netdev_err(priv->dev, "failed to initialize RX ring\n");
1828                 return ret;
1829         }
1830 
1831         /* init rDma */
1832         bcmgenet_rdma_writel(priv, DMA_MAX_BURST_LENGTH, DMA_SCB_BURST_SIZE);
1833 
1834         /* Init tDma */
1835         bcmgenet_tdma_writel(priv, DMA_MAX_BURST_LENGTH, DMA_SCB_BURST_SIZE);
1836 
1837         /* Initialize common TX ring structures */
1838         priv->tx_bds = priv->base + priv->hw_params->tdma_offset;
1839         priv->num_tx_bds = TOTAL_DESC;
1840         priv->tx_cbs = kcalloc(priv->num_tx_bds, sizeof(struct enet_cb),
1841                                GFP_KERNEL);
1842         if (!priv->tx_cbs) {
1843                 bcmgenet_fini_dma(priv);
1844                 return -ENOMEM;
1845         }
1846 
1847         /* initialize multi xmit queue */
1848         bcmgenet_init_multiq(priv->dev);
1849 
1850         /* initialize special ring 16 */
1851         bcmgenet_init_tx_ring(priv, DESC_INDEX, GENET_DEFAULT_BD_CNT,
1852                               priv->hw_params->tx_queues *
1853                               priv->hw_params->bds_cnt,
1854                               TOTAL_DESC);
1855 
1856         return 0;
1857 }
1858 
1859 /* NAPI polling method*/
1860 static int bcmgenet_poll(struct napi_struct *napi, int budget)
1861 {
1862         struct bcmgenet_priv *priv = container_of(napi,
1863                         struct bcmgenet_priv, napi);
1864         unsigned int work_done;
1865 
1866         /* tx reclaim */
1867         bcmgenet_tx_reclaim(priv->dev, &priv->tx_rings[DESC_INDEX]);
1868 
1869         work_done = bcmgenet_desc_rx(priv, budget);
1870 
1871         /* Advancing our consumer index*/
1872         priv->rx_c_index += work_done;
1873         priv->rx_c_index &= DMA_C_INDEX_MASK;
1874         bcmgenet_rdma_ring_writel(priv, DESC_INDEX,
1875                                   priv->rx_c_index, RDMA_CONS_INDEX);
1876         if (work_done < budget) {
1877                 napi_complete(napi);
1878                 bcmgenet_intrl2_0_writel(priv, UMAC_IRQ_RXDMA_BDONE,
1879                                          INTRL2_CPU_MASK_CLEAR);
1880         }
1881 
1882         return work_done;
1883 }
1884 
1885 /* Interrupt bottom half */
1886 static void bcmgenet_irq_task(struct work_struct *work)
1887 {
1888         struct bcmgenet_priv *priv = container_of(
1889                         work, struct bcmgenet_priv, bcmgenet_irq_work);
1890 
1891         netif_dbg(priv, intr, priv->dev, "%s\n", __func__);
1892 
1893         if (priv->irq0_stat & UMAC_IRQ_MPD_R) {
1894                 priv->irq0_stat &= ~UMAC_IRQ_MPD_R;
1895                 netif_dbg(priv, wol, priv->dev,
1896                           "magic packet detected, waking up\n");
1897                 bcmgenet_power_up(priv, GENET_POWER_WOL_MAGIC);
1898         }
1899 
1900         /* Link UP/DOWN event */
1901         if ((priv->hw_params->flags & GENET_HAS_MDIO_INTR) &&
1902             (priv->irq0_stat & (UMAC_IRQ_LINK_UP|UMAC_IRQ_LINK_DOWN))) {
1903                 phy_mac_interrupt(priv->phydev,
1904                                   priv->irq0_stat & UMAC_IRQ_LINK_UP);
1905                 priv->irq0_stat &= ~(UMAC_IRQ_LINK_UP|UMAC_IRQ_LINK_DOWN);
1906         }
1907 }
1908 
1909 /* bcmgenet_isr1: interrupt handler for ring buffer. */
1910 static irqreturn_t bcmgenet_isr1(int irq, void *dev_id)
1911 {
1912         struct bcmgenet_priv *priv = dev_id;
1913         unsigned int index;
1914 
1915         /* Save irq status for bottom-half processing. */
1916         priv->irq1_stat =
1917                 bcmgenet_intrl2_1_readl(priv, INTRL2_CPU_STAT) &
1918                 ~priv->int1_mask;
1919         /* clear interrupts */
1920         bcmgenet_intrl2_1_writel(priv, priv->irq1_stat, INTRL2_CPU_CLEAR);
1921 
1922         netif_dbg(priv, intr, priv->dev,
1923                   "%s: IRQ=0x%x\n", __func__, priv->irq1_stat);
1924         /* Check the MBDONE interrupts.
1925          * packet is done, reclaim descriptors
1926          */
1927         if (priv->irq1_stat & 0x0000ffff) {
1928                 index = 0;
1929                 for (index = 0; index < 16; index++) {
1930                         if (priv->irq1_stat & (1 << index))
1931                                 bcmgenet_tx_reclaim(priv->dev,
1932                                                     &priv->tx_rings[index]);
1933                 }
1934         }
1935         return IRQ_HANDLED;
1936 }
1937 
1938 /* bcmgenet_isr0: Handle various interrupts. */
1939 static irqreturn_t bcmgenet_isr0(int irq, void *dev_id)
1940 {
1941         struct bcmgenet_priv *priv = dev_id;
1942 
1943         /* Save irq status for bottom-half processing. */
1944         priv->irq0_stat =
1945                 bcmgenet_intrl2_0_readl(priv, INTRL2_CPU_STAT) &
1946                 ~bcmgenet_intrl2_0_readl(priv, INTRL2_CPU_MASK_STATUS);
1947         /* clear interrupts */
1948         bcmgenet_intrl2_0_writel(priv, priv->irq0_stat, INTRL2_CPU_CLEAR);
1949 
1950         netif_dbg(priv, intr, priv->dev,
1951                   "IRQ=0x%x\n", priv->irq0_stat);
1952 
1953         if (priv->irq0_stat & (UMAC_IRQ_RXDMA_BDONE | UMAC_IRQ_RXDMA_PDONE)) {
1954                 /* We use NAPI(software interrupt throttling, if
1955                  * Rx Descriptor throttling is not used.
1956                  * Disable interrupt, will be enabled in the poll method.
1957                  */
1958                 if (likely(napi_schedule_prep(&priv->napi))) {
1959                         bcmgenet_intrl2_0_writel(priv, UMAC_IRQ_RXDMA_BDONE,
1960                                                  INTRL2_CPU_MASK_SET);
1961                         __napi_schedule(&priv->napi);
1962                 }
1963         }
1964         if (priv->irq0_stat &
1965                         (UMAC_IRQ_TXDMA_BDONE | UMAC_IRQ_TXDMA_PDONE)) {
1966                 /* Tx reclaim */
1967                 bcmgenet_tx_reclaim(priv->dev, &priv->tx_rings[DESC_INDEX]);
1968         }
1969         if (priv->irq0_stat & (UMAC_IRQ_PHY_DET_R |
1970                                 UMAC_IRQ_PHY_DET_F |
1971                                 UMAC_IRQ_LINK_UP |
1972                                 UMAC_IRQ_LINK_DOWN |
1973                                 UMAC_IRQ_HFB_SM |
1974                                 UMAC_IRQ_HFB_MM |
1975                                 UMAC_IRQ_MPD_R)) {
1976                 /* all other interested interrupts handled in bottom half */
1977                 schedule_work(&priv->bcmgenet_irq_work);
1978         }
1979 
1980         if ((priv->hw_params->flags & GENET_HAS_MDIO_INTR) &&
1981             priv->irq0_stat & (UMAC_IRQ_MDIO_DONE | UMAC_IRQ_MDIO_ERROR)) {
1982                 priv->irq0_stat &= ~(UMAC_IRQ_MDIO_DONE | UMAC_IRQ_MDIO_ERROR);
1983                 wake_up(&priv->wq);
1984         }
1985 
1986         return IRQ_HANDLED;
1987 }
1988 
1989 static irqreturn_t bcmgenet_wol_isr(int irq, void *dev_id)
1990 {
1991         struct bcmgenet_priv *priv = dev_id;
1992 
1993         pm_wakeup_event(&priv->pdev->dev, 0);
1994 
1995         return IRQ_HANDLED;
1996 }
1997 
1998 static void bcmgenet_umac_reset(struct bcmgenet_priv *priv)
1999 {
2000         u32 reg;
2001 
2002         reg = bcmgenet_rbuf_ctrl_get(priv);
2003         reg |= BIT(1);
2004         bcmgenet_rbuf_ctrl_set(priv, reg);
2005         udelay(10);
2006 
2007         reg &= ~BIT(1);
2008         bcmgenet_rbuf_ctrl_set(priv, reg);
2009         udelay(10);
2010 }
2011 
2012 static void bcmgenet_set_hw_addr(struct bcmgenet_priv *priv,
2013                                  unsigned char *addr)
2014 {
2015         bcmgenet_umac_writel(priv, (addr[0] << 24) | (addr[1] << 16) |
2016                         (addr[2] << 8) | addr[3], UMAC_MAC0);
2017         bcmgenet_umac_writel(priv, (addr[4] << 8) | addr[5], UMAC_MAC1);
2018 }
2019 
2020 static int bcmgenet_wol_resume(struct bcmgenet_priv *priv)
2021 {
2022         /* From WOL-enabled suspend, switch to regular clock */
2023         if (priv->wolopts)
2024                 clk_disable_unprepare(priv->clk_wol);
2025 
2026         phy_init_hw(priv->phydev);
2027         /* Speed settings must be restored */
2028         bcmgenet_mii_config(priv->dev);
2029 
2030         return 0;
2031 }
2032 
2033 /* Returns a reusable dma control register value */
2034 static u32 bcmgenet_dma_disable(struct bcmgenet_priv *priv)
2035 {
2036         u32 reg;
2037         u32 dma_ctrl;
2038 
2039         /* disable DMA */
2040         dma_ctrl = 1 << (DESC_INDEX + DMA_RING_BUF_EN_SHIFT) | DMA_EN;
2041         reg = bcmgenet_tdma_readl(priv, DMA_CTRL);
2042         reg &= ~dma_ctrl;
2043         bcmgenet_tdma_writel(priv, reg, DMA_CTRL);
2044 
2045         reg = bcmgenet_rdma_readl(priv, DMA_CTRL);
2046         reg &= ~dma_ctrl;
2047         bcmgenet_rdma_writel(priv, reg, DMA_CTRL);
2048 
2049         bcmgenet_umac_writel(priv, 1, UMAC_TX_FLUSH);
2050         udelay(10);
2051         bcmgenet_umac_writel(priv, 0, UMAC_TX_FLUSH);
2052 
2053         return dma_ctrl;
2054 }
2055 
2056 static void bcmgenet_enable_dma(struct bcmgenet_priv *priv, u32 dma_ctrl)
2057 {
2058         u32 reg;
2059 
2060         reg = bcmgenet_rdma_readl(priv, DMA_CTRL);
2061         reg |= dma_ctrl;
2062         bcmgenet_rdma_writel(priv, reg, DMA_CTRL);
2063 
2064         reg = bcmgenet_tdma_readl(priv, DMA_CTRL);
2065         reg |= dma_ctrl;
2066         bcmgenet_tdma_writel(priv, reg, DMA_CTRL);
2067 }
2068 
2069 static void bcmgenet_netif_start(struct net_device *dev)
2070 {
2071         struct bcmgenet_priv *priv = netdev_priv(dev);
2072 
2073         /* Start the network engine */
2074         napi_enable(&priv->napi);
2075 
2076         umac_enable_set(priv, CMD_TX_EN | CMD_RX_EN, true);
2077 
2078         if (phy_is_internal(priv->phydev))
2079                 bcmgenet_power_up(priv, GENET_POWER_PASSIVE);
2080 
2081         netif_tx_start_all_queues(dev);
2082 
2083         phy_start(priv->phydev);
2084 }
2085 
2086 static int bcmgenet_open(struct net_device *dev)
2087 {
2088         struct bcmgenet_priv *priv = netdev_priv(dev);
2089         unsigned long dma_ctrl;
2090         u32 reg;
2091         int ret;
2092 
2093         netif_dbg(priv, ifup, dev, "bcmgenet_open\n");
2094 
2095         /* Turn on the clock */
2096         if (!IS_ERR(priv->clk))
2097                 clk_prepare_enable(priv->clk);
2098 
2099         /* take MAC out of reset */
2100         bcmgenet_umac_reset(priv);
2101 
2102         ret = init_umac(priv);
2103         if (ret)
2104                 goto err_clk_disable;
2105 
2106         /* disable ethernet MAC while updating its registers */
2107         umac_enable_set(priv, CMD_TX_EN | CMD_RX_EN, false);
2108 
2109         /* Make sure we reflect the value of CRC_CMD_FWD */
2110         reg = bcmgenet_umac_readl(priv, UMAC_CMD);
2111         priv->crc_fwd_en = !!(reg & CMD_CRC_FWD);
2112 
2113         bcmgenet_set_hw_addr(priv, dev->dev_addr);
2114 
2115         if (phy_is_internal(priv->phydev)) {
2116                 reg = bcmgenet_ext_readl(priv, EXT_EXT_PWR_MGMT);
2117                 reg |= EXT_ENERGY_DET_MASK;
2118                 bcmgenet_ext_writel(priv, reg, EXT_EXT_PWR_MGMT);
2119         }
2120 
2121         /* Disable RX/TX DMA and flush TX queues */
2122         dma_ctrl = bcmgenet_dma_disable(priv);
2123 
2124         /* Reinitialize TDMA and RDMA and SW housekeeping */
2125         ret = bcmgenet_init_dma(priv);
2126         if (ret) {
2127                 netdev_err(dev, "failed to initialize DMA\n");
2128                 goto err_fini_dma;
2129         }
2130 
2131         /* Always enable ring 16 - descriptor ring */
2132         bcmgenet_enable_dma(priv, dma_ctrl);
2133 
2134         ret = request_irq(priv->irq0, bcmgenet_isr0, IRQF_SHARED,
2135                           dev->name, priv);
2136         if (ret < 0) {
2137                 netdev_err(dev, "can't request IRQ %d\n", priv->irq0);
2138                 goto err_fini_dma;
2139         }
2140 
2141         ret = request_irq(priv->irq1, bcmgenet_isr1, IRQF_SHARED,
2142                           dev->name, priv);
2143         if (ret < 0) {
2144                 netdev_err(dev, "can't request IRQ %d\n", priv->irq1);
2145                 goto err_irq0;
2146         }
2147 
2148         bcmgenet_netif_start(dev);
2149 
2150         return 0;
2151 
2152 err_irq0:
2153         free_irq(priv->irq0, dev);
2154 err_fini_dma:
2155         bcmgenet_fini_dma(priv);
2156 err_clk_disable:
2157         if (!IS_ERR(priv->clk))
2158                 clk_disable_unprepare(priv->clk);
2159         return ret;
2160 }
2161 
2162 static void bcmgenet_netif_stop(struct net_device *dev)
2163 {
2164         struct bcmgenet_priv *priv = netdev_priv(dev);
2165 
2166         netif_tx_stop_all_queues(dev);
2167         napi_disable(&priv->napi);
2168         phy_stop(priv->phydev);
2169 
2170         bcmgenet_intr_disable(priv);
2171 
2172         /* Wait for pending work items to complete. Since interrupts are
2173          * disabled no new work will be scheduled.
2174          */
2175         cancel_work_sync(&priv->bcmgenet_irq_work);
2176 
2177         priv->old_pause = -1;
2178         priv->old_link = -1;
2179         priv->old_duplex = -1;
2180 }
2181 
2182 static int bcmgenet_close(struct net_device *dev)
2183 {
2184         struct bcmgenet_priv *priv = netdev_priv(dev);
2185         int ret;
2186 
2187         netif_dbg(priv, ifdown, dev, "bcmgenet_close\n");
2188 
2189         bcmgenet_netif_stop(dev);
2190 
2191         /* Disable MAC receive */
2192         umac_enable_set(priv, CMD_RX_EN, false);
2193 
2194         ret = bcmgenet_dma_teardown(priv);
2195         if (ret)
2196                 return ret;
2197 
2198         /* Disable MAC transmit. TX DMA disabled have to done before this */
2199         umac_enable_set(priv, CMD_TX_EN, false);
2200 
2201         /* tx reclaim */
2202         bcmgenet_tx_reclaim_all(dev);
2203         bcmgenet_fini_dma(priv);
2204 
2205         free_irq(priv->irq0, priv);
2206         free_irq(priv->irq1, priv);
2207 
2208         if (phy_is_internal(priv->phydev))
2209                 bcmgenet_power_down(priv, GENET_POWER_PASSIVE);
2210 
2211         if (!IS_ERR(priv->clk))
2212                 clk_disable_unprepare(priv->clk);
2213 
2214         return 0;
2215 }
2216 
2217 static void bcmgenet_timeout(struct net_device *dev)
2218 {
2219         struct bcmgenet_priv *priv = netdev_priv(dev);
2220 
2221         netif_dbg(priv, tx_err, dev, "bcmgenet_timeout\n");
2222 
2223         dev->trans_start = jiffies;
2224 
2225         dev->stats.tx_errors++;
2226 
2227         netif_tx_wake_all_queues(dev);
2228 }
2229 
2230 #define MAX_MC_COUNT    16
2231 
2232 static inline void bcmgenet_set_mdf_addr(struct bcmgenet_priv *priv,
2233                                          unsigned char *addr,
2234                                          int *i,
2235                                          int *mc)
2236 {
2237         u32 reg;
2238 
2239         bcmgenet_umac_writel(priv, addr[0] << 8 | addr[1],
2240                              UMAC_MDF_ADDR + (*i * 4));
2241         bcmgenet_umac_writel(priv, addr[2] << 24 | addr[3] << 16 |
2242                              addr[4] << 8 | addr[5],
2243                              UMAC_MDF_ADDR + ((*i + 1) * 4));
2244         reg = bcmgenet_umac_readl(priv, UMAC_MDF_CTRL);
2245         reg |= (1 << (MAX_MC_COUNT - *mc));
2246         bcmgenet_umac_writel(priv, reg, UMAC_MDF_CTRL);
2247         *i += 2;
2248         (*mc)++;
2249 }
2250 
2251 static void bcmgenet_set_rx_mode(struct net_device *dev)
2252 {
2253         struct bcmgenet_priv *priv = netdev_priv(dev);
2254         struct netdev_hw_addr *ha;
2255         int i, mc;
2256         u32 reg;
2257 
2258         netif_dbg(priv, hw, dev, "%s: %08X\n", __func__, dev->flags);
2259 
2260         /* Promiscuous mode */
2261         reg = bcmgenet_umac_readl(priv, UMAC_CMD);
2262         if (dev->flags & IFF_PROMISC) {
2263                 reg |= CMD_PROMISC;
2264                 bcmgenet_umac_writel(priv, reg, UMAC_CMD);
2265                 bcmgenet_umac_writel(priv, 0, UMAC_MDF_CTRL);
2266                 return;
2267         } else {
2268                 reg &= ~CMD_PROMISC;
2269                 bcmgenet_umac_writel(priv, reg, UMAC_CMD);
2270         }
2271 
2272         /* UniMac doesn't support ALLMULTI */
2273         if (dev->flags & IFF_ALLMULTI) {
2274                 netdev_warn(dev, "ALLMULTI is not supported\n");
2275                 return;
2276         }
2277 
2278         /* update MDF filter */
2279         i = 0;
2280         mc = 0;
2281         /* Broadcast */
2282         bcmgenet_set_mdf_addr(priv, dev->broadcast, &i, &mc);
2283         /* my own address.*/
2284         bcmgenet_set_mdf_addr(priv, dev->dev_addr, &i, &mc);
2285         /* Unicast list*/
2286         if (netdev_uc_count(dev) > (MAX_MC_COUNT - mc))
2287                 return;
2288 
2289         if (!netdev_uc_empty(dev))
2290                 netdev_for_each_uc_addr(ha, dev)
2291                         bcmgenet_set_mdf_addr(priv, ha->addr, &i, &mc);
2292         /* Multicast */
2293         if (netdev_mc_empty(dev) || netdev_mc_count(dev) >= (MAX_MC_COUNT - mc))
2294                 return;
2295 
2296         netdev_for_each_mc_addr(ha, dev)
2297                 bcmgenet_set_mdf_addr(priv, ha->addr, &i, &mc);
2298 }
2299 
2300 /* Set the hardware MAC address. */
2301 static int bcmgenet_set_mac_addr(struct net_device *dev, void *p)
2302 {
2303         struct sockaddr *addr = p;
2304 
2305         /* Setting the MAC address at the hardware level is not possible
2306          * without disabling the UniMAC RX/TX enable bits.
2307          */
2308         if (netif_running(dev))
2309                 return -EBUSY;
2310 
2311         ether_addr_copy(dev->dev_addr, addr->sa_data);
2312 
2313         return 0;
2314 }
2315 
2316 static const struct net_device_ops bcmgenet_netdev_ops = {
2317         .ndo_open               = bcmgenet_open,
2318         .ndo_stop               = bcmgenet_close,
2319         .ndo_start_xmit         = bcmgenet_xmit,
2320         .ndo_tx_timeout         = bcmgenet_timeout,
2321         .ndo_set_rx_mode        = bcmgenet_set_rx_mode,
2322         .ndo_set_mac_address    = bcmgenet_set_mac_addr,
2323         .ndo_do_ioctl           = bcmgenet_ioctl,
2324         .ndo_set_features       = bcmgenet_set_features,
2325 };
2326 
2327 /* Array of GENET hardware parameters/characteristics */
2328 static struct bcmgenet_hw_params bcmgenet_hw_params[] = {
2329         [GENET_V1] = {
2330                 .tx_queues = 0,
2331                 .rx_queues = 0,
2332                 .bds_cnt = 0,
2333                 .bp_in_en_shift = 16,
2334                 .bp_in_mask = 0xffff,
2335                 .hfb_filter_cnt = 16,
2336                 .qtag_mask = 0x1F,
2337                 .hfb_offset = 0x1000,
2338                 .rdma_offset = 0x2000,
2339                 .tdma_offset = 0x3000,
2340                 .words_per_bd = 2,
2341         },
2342         [GENET_V2] = {
2343                 .tx_queues = 4,
2344                 .rx_queues = 4,
2345                 .bds_cnt = 32,
2346                 .bp_in_en_shift = 16,
2347                 .bp_in_mask = 0xffff,
2348                 .hfb_filter_cnt = 16,
2349                 .qtag_mask = 0x1F,
2350                 .tbuf_offset = 0x0600,
2351                 .hfb_offset = 0x1000,
2352                 .hfb_reg_offset = 0x2000,
2353                 .rdma_offset = 0x3000,
2354                 .tdma_offset = 0x4000,
2355                 .words_per_bd = 2,
2356                 .flags = GENET_HAS_EXT,
2357         },
2358         [GENET_V3] = {
2359                 .tx_queues = 4,
2360                 .rx_queues = 4,
2361                 .bds_cnt = 32,
2362                 .bp_in_en_shift = 17,
2363                 .bp_in_mask = 0x1ffff,
2364                 .hfb_filter_cnt = 48,
2365                 .qtag_mask = 0x3F,
2366                 .tbuf_offset = 0x0600,
2367                 .hfb_offset = 0x8000,
2368                 .hfb_reg_offset = 0xfc00,
2369                 .rdma_offset = 0x10000,
2370                 .tdma_offset = 0x11000,
2371                 .words_per_bd = 2,
2372                 .flags = GENET_HAS_EXT | GENET_HAS_MDIO_INTR,
2373         },
2374         [GENET_V4] = {
2375                 .tx_queues = 4,
2376                 .rx_queues = 4,
2377                 .bds_cnt = 32,
2378                 .bp_in_en_shift = 17,
2379                 .bp_in_mask = 0x1ffff,
2380                 .hfb_filter_cnt = 48,
2381                 .qtag_mask = 0x3F,
2382                 .tbuf_offset = 0x0600,
2383                 .hfb_offset = 0x8000,
2384                 .hfb_reg_offset = 0xfc00,
2385                 .rdma_offset = 0x2000,
2386                 .tdma_offset = 0x4000,
2387                 .words_per_bd = 3,
2388                 .flags = GENET_HAS_40BITS | GENET_HAS_EXT | GENET_HAS_MDIO_INTR,
2389         },
2390 };
2391 
2392 /* Infer hardware parameters from the detected GENET version */
2393 static void bcmgenet_set_hw_params(struct bcmgenet_priv *priv)
2394 {
2395         struct bcmgenet_hw_params *params;
2396         u32 reg;
2397         u8 major;
2398 
2399         if (GENET_IS_V4(priv)) {
2400                 bcmgenet_dma_regs = bcmgenet_dma_regs_v3plus;
2401                 genet_dma_ring_regs = genet_dma_ring_regs_v4;
2402                 priv->dma_rx_chk_bit = DMA_RX_CHK_V3PLUS;
2403                 priv->version = GENET_V4;
2404         } else if (GENET_IS_V3(priv)) {
2405                 bcmgenet_dma_regs = bcmgenet_dma_regs_v3plus;
2406                 genet_dma_ring_regs = genet_dma_ring_regs_v123;
2407                 priv->dma_rx_chk_bit = DMA_RX_CHK_V3PLUS;
2408                 priv->version = GENET_V3;
2409         } else if (GENET_IS_V2(priv)) {
2410                 bcmgenet_dma_regs = bcmgenet_dma_regs_v2;
2411                 genet_dma_ring_regs = genet_dma_ring_regs_v123;
2412                 priv->dma_rx_chk_bit = DMA_RX_CHK_V12;
2413                 priv->version = GENET_V2;
2414         } else if (GENET_IS_V1(priv)) {
2415                 bcmgenet_dma_regs = bcmgenet_dma_regs_v1;
2416                 genet_dma_ring_regs = genet_dma_ring_regs_v123;
2417                 priv->dma_rx_chk_bit = DMA_RX_CHK_V12;
2418                 priv->version = GENET_V1;
2419         }
2420 
2421         /* enum genet_version starts at 1 */
2422         priv->hw_params = &bcmgenet_hw_params[priv->version];
2423         params = priv->hw_params;
2424 
2425         /* Read GENET HW version */
2426         reg = bcmgenet_sys_readl(priv, SYS_REV_CTRL);
2427         major = (reg >> 24 & 0x0f);
2428         if (major == 5)
2429                 major = 4;
2430         else if (major == 0)
2431                 major = 1;
2432         if (major != priv->version) {
2433                 dev_err(&priv->pdev->dev,
2434                         "GENET version mismatch, got: %d, configured for: %d\n",
2435                         major, priv->version);
2436         }
2437 
2438         /* Print the GENET core version */
2439         dev_info(&priv->pdev->dev, "GENET " GENET_VER_FMT,
2440                  major, (reg >> 16) & 0x0f, reg & 0xffff);
2441 
2442 #ifdef CONFIG_PHYS_ADDR_T_64BIT
2443         if (!(params->flags & GENET_HAS_40BITS))
2444                 pr_warn("GENET does not support 40-bits PA\n");
2445 #endif
2446 
2447         pr_debug("Configuration for version: %d\n"
2448                 "TXq: %1d, RXq: %1d, BDs: %1d\n"
2449                 "BP << en: %2d, BP msk: 0x%05x\n"
2450                 "HFB count: %2d, QTAQ msk: 0x%05x\n"
2451                 "TBUF: 0x%04x, HFB: 0x%04x, HFBreg: 0x%04x\n"
2452                 "RDMA: 0x%05x, TDMA: 0x%05x\n"
2453                 "Words/BD: %d\n",
2454                 priv->version,
2455                 params->tx_queues, params->rx_queues, params->bds_cnt,
2456                 params->bp_in_en_shift, params->bp_in_mask,
2457                 params->hfb_filter_cnt, params->qtag_mask,
2458                 params->tbuf_offset, params->hfb_offset,
2459                 params->hfb_reg_offset,
2460                 params->rdma_offset, params->tdma_offset,
2461                 params->words_per_bd);
2462 }
2463 
2464 static const struct of_device_id bcmgenet_match[] = {
2465         { .compatible = "brcm,genet-v1", .data = (void *)GENET_V1 },
2466         { .compatible = "brcm,genet-v2", .data = (void *)GENET_V2 },
2467         { .compatible = "brcm,genet-v3", .data = (void *)GENET_V3 },
2468         { .compatible = "brcm,genet-v4", .data = (void *)GENET_V4 },
2469         { },
2470 };
2471 
2472 static int bcmgenet_probe(struct platform_device *pdev)
2473 {
2474         struct device_node *dn = pdev->dev.of_node;
2475         const struct of_device_id *of_id;
2476         struct bcmgenet_priv *priv;
2477         struct net_device *dev;
2478         const void *macaddr;
2479         struct resource *r;
2480         int err = -EIO;
2481 
2482         /* Up to GENET_MAX_MQ_CNT + 1 TX queues and a single RX queue */
2483         dev = alloc_etherdev_mqs(sizeof(*priv), GENET_MAX_MQ_CNT + 1, 1);
2484         if (!dev) {
2485                 dev_err(&pdev->dev, "can't allocate net device\n");
2486                 return -ENOMEM;
2487         }
2488 
2489         of_id = of_match_node(bcmgenet_match, dn);
2490         if (!of_id)
2491                 return -EINVAL;
2492 
2493         priv = netdev_priv(dev);
2494         priv->irq0 = platform_get_irq(pdev, 0);
2495         priv->irq1 = platform_get_irq(pdev, 1);
2496         priv->wol_irq = platform_get_irq(pdev, 2);
2497         if (!priv->irq0 || !priv->irq1) {
2498                 dev_err(&pdev->dev, "can't find IRQs\n");
2499                 err = -EINVAL;
2500                 goto err;
2501         }
2502 
2503         macaddr = of_get_mac_address(dn);
2504         if (!macaddr) {
2505                 dev_err(&pdev->dev, "can't find MAC address\n");
2506                 err = -EINVAL;
2507                 goto err;
2508         }
2509 
2510         r = platform_get_resource(pdev, IORESOURCE_MEM, 0);
2511         priv->base = devm_ioremap_resource(&pdev->dev, r);
2512         if (IS_ERR(priv->base)) {
2513                 err = PTR_ERR(priv->base);
2514                 goto err;
2515         }
2516 
2517         SET_NETDEV_DEV(dev, &pdev->dev);
2518         dev_set_drvdata(&pdev->dev, dev);
2519         ether_addr_copy(dev->dev_addr, macaddr);
2520         dev->watchdog_timeo = 2 * HZ;
2521         dev->ethtool_ops = &bcmgenet_ethtool_ops;
2522         dev->netdev_ops = &bcmgenet_netdev_ops;
2523         netif_napi_add(dev, &priv->napi, bcmgenet_poll, 64);
2524 
2525         priv->msg_enable = netif_msg_init(-1, GENET_MSG_DEFAULT);
2526 
2527         /* Set hardware features */
2528         dev->hw_features |= NETIF_F_SG | NETIF_F_IP_CSUM |
2529                 NETIF_F_IPV6_CSUM | NETIF_F_RXCSUM;
2530 
2531         /* Request the WOL interrupt and advertise suspend if available */
2532         priv->wol_irq_disabled = true;
2533         err = devm_request_irq(&pdev->dev, priv->wol_irq, bcmgenet_wol_isr, 0,
2534                                dev->name, priv);
2535         if (!err)
2536                 device_set_wakeup_capable(&pdev->dev, 1);
2537 
2538         /* Set the needed headroom to account for any possible
2539          * features enabling/disabling at runtime
2540          */
2541         dev->needed_headroom += 64;
2542 
2543         netdev_boot_setup_check(dev);
2544 
2545         priv->dev = dev;
2546         priv->pdev = pdev;
2547         priv->version = (enum bcmgenet_version)of_id->data;
2548 
2549         priv->clk = devm_clk_get(&priv->pdev->dev, "enet");
2550         if (IS_ERR(priv->clk))
2551                 dev_warn(&priv->pdev->dev, "failed to get enet clock\n");
2552 
2553         if (!IS_ERR(priv->clk))
2554                 clk_prepare_enable(priv->clk);
2555 
2556         bcmgenet_set_hw_params(priv);
2557 
2558         /* Mii wait queue */
2559         init_waitqueue_head(&priv->wq);
2560         /* Always use RX_BUF_LENGTH (2KB) buffer for all chips */
2561         priv->rx_buf_len = RX_BUF_LENGTH;
2562         INIT_WORK(&priv->bcmgenet_irq_work, bcmgenet_irq_task);
2563 
2564         priv->clk_wol = devm_clk_get(&priv->pdev->dev, "enet-wol");
2565         if (IS_ERR(priv->clk_wol))
2566                 dev_warn(&priv->pdev->dev, "failed to get enet-wol clock\n");
2567 
2568         err = reset_umac(priv);
2569         if (err)
2570                 goto err_clk_disable;
2571 
2572         err = bcmgenet_mii_init(dev);
2573         if (err)
2574                 goto err_clk_disable;
2575 
2576         /* setup number of real queues  + 1 (GENET_V1 has 0 hardware queues
2577          * just the ring 16 descriptor based TX
2578          */
2579         netif_set_real_num_tx_queues(priv->dev, priv->hw_params->tx_queues + 1);
2580         netif_set_real_num_rx_queues(priv->dev, priv->hw_params->rx_queues + 1);
2581 
2582         /* libphy will determine the link state */
2583         netif_carrier_off(dev);
2584 
2585         /* Turn off the main clock, WOL clock is handled separately */
2586         if (!IS_ERR(priv->clk))
2587                 clk_disable_unprepare(priv->clk);
2588 
2589         err = register_netdev(dev);
2590         if (err)
2591                 goto err;
2592 
2593         return err;
2594 
2595 err_clk_disable:
2596         if (!IS_ERR(priv->clk))
2597                 clk_disable_unprepare(priv->clk);
2598 err:
2599         free_netdev(dev);
2600         return err;
2601 }
2602 
2603 static int bcmgenet_remove(struct platform_device *pdev)
2604 {
2605         struct bcmgenet_priv *priv = dev_to_priv(&pdev->dev);
2606 
2607         dev_set_drvdata(&pdev->dev, NULL);
2608         unregister_netdev(priv->dev);
2609         bcmgenet_mii_exit(priv->dev);
2610         free_netdev(priv->dev);
2611 
2612         return 0;
2613 }
2614 
2615 #ifdef CONFIG_PM_SLEEP
2616 static int bcmgenet_suspend(struct device *d)
2617 {
2618         struct net_device *dev = dev_get_drvdata(d);
2619         struct bcmgenet_priv *priv = netdev_priv(dev);
2620         int ret;
2621 
2622         if (!netif_running(dev))
2623                 return 0;
2624 
2625         bcmgenet_netif_stop(dev);
2626 
2627         phy_suspend(priv->phydev);
2628 
2629         netif_device_detach(dev);
2630 
2631         /* Disable MAC receive */
2632         umac_enable_set(priv, CMD_RX_EN, false);
2633 
2634         ret = bcmgenet_dma_teardown(priv);
2635         if (ret)
2636                 return ret;
2637 
2638         /* Disable MAC transmit. TX DMA disabled have to done before this */
2639         umac_enable_set(priv, CMD_TX_EN, false);
2640 
2641         /* tx reclaim */
2642         bcmgenet_tx_reclaim_all(dev);
2643         bcmgenet_fini_dma(priv);
2644 
2645         /* Prepare the device for Wake-on-LAN and switch to the slow clock */
2646         if (device_may_wakeup(d) && priv->wolopts) {
2647                 bcmgenet_power_down(priv, GENET_POWER_WOL_MAGIC);
2648                 clk_prepare_enable(priv->clk_wol);
2649         }
2650 
2651         /* Turn off the clocks */
2652         clk_disable_unprepare(priv->clk);
2653 
2654         return 0;
2655 }
2656 
2657 static int bcmgenet_resume(struct device *d)
2658 {
2659         struct net_device *dev = dev_get_drvdata(d);
2660         struct bcmgenet_priv *priv = netdev_priv(dev);
2661         unsigned long dma_ctrl;
2662         int ret;
2663         u32 reg;
2664 
2665         if (!netif_running(dev))
2666                 return 0;
2667 
2668         /* Turn on the clock */
2669         ret = clk_prepare_enable(priv->clk);
2670         if (ret)
2671                 return ret;
2672 
2673         bcmgenet_umac_reset(priv);
2674 
2675         ret = init_umac(priv);
2676         if (ret)
2677                 goto out_clk_disable;
2678 
2679         ret = bcmgenet_wol_resume(priv);
2680         if (ret)
2681                 goto out_clk_disable;
2682 
2683         /* disable ethernet MAC while updating its registers */
2684         umac_enable_set(priv, CMD_TX_EN | CMD_RX_EN, false);
2685 
2686         bcmgenet_set_hw_addr(priv, dev->dev_addr);
2687 
2688         if (phy_is_internal(priv->phydev)) {
2689                 reg = bcmgenet_ext_readl(priv, EXT_EXT_PWR_MGMT);
2690                 reg |= EXT_ENERGY_DET_MASK;
2691                 bcmgenet_ext_writel(priv, reg, EXT_EXT_PWR_MGMT);
2692         }
2693 
2694         if (priv->wolopts)
2695                 bcmgenet_power_up(priv, GENET_POWER_WOL_MAGIC);
2696 
2697         /* Disable RX/TX DMA and flush TX queues */
2698         dma_ctrl = bcmgenet_dma_disable(priv);
2699 
2700         /* Reinitialize TDMA and RDMA and SW housekeeping */
2701         ret = bcmgenet_init_dma(priv);
2702         if (ret) {
2703                 netdev_err(dev, "failed to initialize DMA\n");
2704                 goto out_clk_disable;
2705         }
2706 
2707         /* Always enable ring 16 - descriptor ring */
2708         bcmgenet_enable_dma(priv, dma_ctrl);
2709 
2710         netif_device_attach(dev);
2711 
2712         phy_resume(priv->phydev);
2713 
2714         bcmgenet_netif_start(dev);
2715 
2716         return 0;
2717 
2718 out_clk_disable:
2719         clk_disable_unprepare(priv->clk);
2720         return ret;
2721 }
2722 #endif /* CONFIG_PM_SLEEP */
2723 
2724 static SIMPLE_DEV_PM_OPS(bcmgenet_pm_ops, bcmgenet_suspend, bcmgenet_resume);
2725 
2726 static struct platform_driver bcmgenet_driver = {
2727         .probe  = bcmgenet_probe,
2728         .remove = bcmgenet_remove,
2729         .driver = {
2730                 .name   = "bcmgenet",
2731                 .owner  = THIS_MODULE,
2732                 .of_match_table = bcmgenet_match,
2733                 .pm     = &bcmgenet_pm_ops,
2734         },
2735 };
2736 module_platform_driver(bcmgenet_driver);
2737 
2738 MODULE_AUTHOR("Broadcom Corporation");
2739 MODULE_DESCRIPTION("Broadcom GENET Ethernet controller driver");
2740 MODULE_ALIAS("platform:bcmgenet");
2741 MODULE_LICENSE("GPL");
2742 

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