drivers/net/ethernet/stmicro/stmmac/norm_desc.c

   1 /*******************************************************************************
   2   This contains the functions to handle the normal descriptors.
   3
   4   Copyright (C) 2007-2009  STMicroelectronics Ltd
   5
   6   This program is free software; you can redistribute it and/or modify it
   7   under the terms and conditions of the GNU General Public License,
   8   version 2, as published by the Free Software Foundation.
   9
  10   This program is distributed in the hope it will be useful, but WITHOUT
  11   ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  12   FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
  13   more details.
  14
  15   The full GNU General Public License is included in this distribution in
  16   the file called "COPYING".
  17
  18   Author: Giuseppe Cavallaro <peppe.cavallaro@st.com>
  19 *******************************************************************************/
  20
  21 #include <linux/stmmac.h>
  22 #include "common.h"
  23 #include "descs_com.h"
  24
  25 static int ndesc_get_tx_status(void *data, struct stmmac_extra_stats *x,
  26                                struct dma_desc *p, void __iomem *ioaddr)
  27 {
  28         struct net_device_stats *stats = (struct net_device_stats *)data;
  29         unsigned int tdes0 = le32_to_cpu(p->des0);
  30         unsigned int tdes1 = le32_to_cpu(p->des1);
  31         int ret = tx_done;
  32
  33         /* Get tx owner first */
  34         if (unlikely(tdes0 & TDES0_OWN))
  35                 return tx_dma_own;
  36
  37         /* Verify tx error by looking at the last segment. */
  38         if (likely(!(tdes1 & TDES1_LAST_SEGMENT)))
  39                 return tx_not_ls;
  40
  41         if (unlikely(tdes0 & TDES0_ERROR_SUMMARY)) {
  42                 if (unlikely(tdes0 & TDES0_UNDERFLOW_ERROR)) {
  43                         x->tx_underflow++;
  44                         stats->tx_fifo_errors++;
  45                 }
  46                 if (unlikely(tdes0 & TDES0_NO_CARRIER)) {
  47                         x->tx_carrier++;
  48                         stats->tx_carrier_errors++;
  49                 }
  50                 if (unlikely(tdes0 & TDES0_LOSS_CARRIER)) {
  51                         x->tx_losscarrier++;
  52                         stats->tx_carrier_errors++;
  53                 }
  54                 if (unlikely((tdes0 & TDES0_EXCESSIVE_DEFERRAL) ||
  55                              (tdes0 & TDES0_EXCESSIVE_COLLISIONS) ||
  56                              (tdes0 & TDES0_LATE_COLLISION))) {
  57                         unsigned int collisions;
  58
  59                         collisions = (tdes0 & TDES0_COLLISION_COUNT_MASK) >> 3;
  60                         stats->collisions += collisions;
  61                 }
  62                 ret = tx_err;
  63         }
  64
  65         if (tdes0 & TDES0_VLAN_FRAME)
  66                 x->tx_vlan++;
  67
  68         if (unlikely(tdes0 & TDES0_DEFERRED))
  69                 x->tx_deferred++;
  70
  71         return ret;
  72 }
  73
  74 static int ndesc_get_tx_len(struct dma_desc *p)
  75 {
  76         return (le32_to_cpu(p->des1) & RDES1_BUFFER1_SIZE_MASK);
  77 }
  78
  79 /* This function verifies if each incoming frame has some errors
  80  * and, if required, updates the multicast statistics.
  81  * In case of success, it returns good_frame because the GMAC device
  82  * is supposed to be able to compute the csum in HW. */
  83 static int ndesc_get_rx_status(void *data, struct stmmac_extra_stats *x,
  84                                struct dma_desc *p)
  85 {
  86         int ret = good_frame;
  87         unsigned int rdes0 = le32_to_cpu(p->des0);
  88         struct net_device_stats *stats = (struct net_device_stats *)data;
  89
  90         if (unlikely(rdes0 & RDES0_OWN))
  91                 return dma_own;
  92
  93         if (unlikely(!(rdes0 & RDES0_LAST_DESCRIPTOR))) {
  94                 stats->rx_length_errors++;
  95                 return discard_frame;
  96         }
  97
  98         if (unlikely(rdes0 & RDES0_ERROR_SUMMARY)) {
  99                 if (unlikely(rdes0 & RDES0_DESCRIPTOR_ERROR))
 100                         x->rx_desc++;
 101                 if (unlikely(rdes0 & RDES0_SA_FILTER_FAIL))
 102                         x->sa_filter_fail++;
 103                 if (unlikely(rdes0 & RDES0_OVERFLOW_ERROR))
 104                         x->overflow_error++;
 105                 if (unlikely(rdes0 & RDES0_IPC_CSUM_ERROR))
 106                         x->ipc_csum_error++;
 107                 if (unlikely(rdes0 & RDES0_COLLISION)) {
 108                         x->rx_collision++;
 109                         stats->collisions++;
 110                 }
 111                 if (unlikely(rdes0 & RDES0_CRC_ERROR)) {
 112                         x->rx_crc_errors++;
 113                         stats->rx_crc_errors++;
 114                 }
 115                 ret = discard_frame;
 116         }
 117         if (unlikely(rdes0 & RDES0_DRIBBLING))
 118                 x->dribbling_bit++;
 119
 120         if (unlikely(rdes0 & RDES0_LENGTH_ERROR)) {
 121                 x->rx_length++;
 122                 ret = discard_frame;
 123         }
 124         if (unlikely(rdes0 & RDES0_MII_ERROR)) {
 125                 x->rx_mii++;
 126                 ret = discard_frame;
 127         }
 128 #ifdef STMMAC_VLAN_TAG_USED
 129         if (rdes0 & RDES0_VLAN_TAG)
 130                 x->vlan_tag++;
 131 #endif
 132         return ret;
 133 }
 134
 135 static void ndesc_init_rx_desc(struct dma_desc *p, int disable_rx_ic, int mode,
 136                                int end, int bfsize)
 137 {
 138         int bfsize1;
 139
 140         p->des0 |= cpu_to_le32(RDES0_OWN);
 141
 142         bfsize1 = min(bfsize, BUF_SIZE_2KiB - 1);
 143         p->des1 |= cpu_to_le32(bfsize1 & RDES1_BUFFER1_SIZE_MASK);
 144
 145         if (mode == STMMAC_CHAIN_MODE)
 146                 ndesc_rx_set_on_chain(p, end);
 147         else
 148                 ndesc_rx_set_on_ring(p, end, bfsize);
 149
 150         if (disable_rx_ic)
 151                 p->des1 |= cpu_to_le32(RDES1_DISABLE_IC);
 152 }
 153
 154 static void ndesc_init_tx_desc(struct dma_desc *p, int mode, int end)
 155 {
 156         p->des0 &= cpu_to_le32(~TDES0_OWN);
 157         if (mode == STMMAC_CHAIN_MODE)
 158                 ndesc_tx_set_on_chain(p);
 159         else
 160                 ndesc_end_tx_desc_on_ring(p, end);
 161 }
 162
 163 static int ndesc_get_tx_owner(struct dma_desc *p)
 164 {
 165         return (le32_to_cpu(p->des0) & TDES0_OWN) >> 31;
 166 }
 167
 168 static void ndesc_set_tx_owner(struct dma_desc *p)
 169 {
 170         p->des0 |= cpu_to_le32(TDES0_OWN);
 171 }
 172
 173 static void ndesc_set_rx_owner(struct dma_desc *p, int disable_rx_ic)
 174 {
 175         p->des0 |= cpu_to_le32(RDES0_OWN);
 176 }
 177
 178 static int ndesc_get_tx_ls(struct dma_desc *p)
 179 {
 180         return (le32_to_cpu(p->des1) & TDES1_LAST_SEGMENT) >> 30;
 181 }
 182
 183 static void ndesc_release_tx_desc(struct dma_desc *p, int mode)
 184 {
 185         int ter = (le32_to_cpu(p->des1) & TDES1_END_RING) >> 25;
 186
 187         memset(p, 0, offsetof(struct dma_desc, des2));
 188         if (mode == STMMAC_CHAIN_MODE)
 189                 ndesc_tx_set_on_chain(p);
 190         else
 191                 ndesc_end_tx_desc_on_ring(p, ter);
 192 }
 193
 194 static void ndesc_prepare_tx_desc(struct dma_desc *p, int is_fs, int len,
 195                                   bool csum_flag, int mode, bool tx_own,
 196                                   bool ls, unsigned int tot_pkt_len)
 197 {
 198         unsigned int tdes1 = le32_to_cpu(p->des1);
 199
 200         if (is_fs)
 201                 tdes1 |= TDES1_FIRST_SEGMENT;
 202         else
 203                 tdes1 &= ~TDES1_FIRST_SEGMENT;
 204
 205         if (likely(csum_flag))
 206                 tdes1 |= (TX_CIC_FULL) << TDES1_CHECKSUM_INSERTION_SHIFT;
 207         else
 208                 tdes1 &= ~(TX_CIC_FULL << TDES1_CHECKSUM_INSERTION_SHIFT);
 209
 210         if (ls)
 211                 tdes1 |= TDES1_LAST_SEGMENT;
 212
 213         p->des1 = cpu_to_le32(tdes1);
 214
 215         if (mode == STMMAC_CHAIN_MODE)
 216                 norm_set_tx_desc_len_on_chain(p, len);
 217         else
 218                 norm_set_tx_desc_len_on_ring(p, len);
 219
 220         if (tx_own)
 221                 p->des0 |= cpu_to_le32(TDES0_OWN);
 222 }
 223
 224 static void ndesc_set_tx_ic(struct dma_desc *p)
 225 {
 226         p->des1 |= cpu_to_le32(TDES1_INTERRUPT);
 227 }
 228
 229 static int ndesc_get_rx_frame_len(struct dma_desc *p, int rx_coe_type)
 230 {
 231         unsigned int csum = 0;
 232
 233         /* The type-1 checksum offload engines append the checksum at
 234          * the end of frame and the two bytes of checksum are added in
 235          * the length.
 236          * Adjust for that in the framelen for type-1 checksum offload
 237          * engines
 238          */
 239         if (rx_coe_type == STMMAC_RX_COE_TYPE1)
 240                 csum = 2;
 241
 242         return (((le32_to_cpu(p->des0) & RDES0_FRAME_LEN_MASK)
 243                                 >> RDES0_FRAME_LEN_SHIFT) -
 244                 csum);
 245
 246 }
 247
 248 static void ndesc_enable_tx_timestamp(struct dma_desc *p)
 249 {
 250         p->des1 |= cpu_to_le32(TDES1_TIME_STAMP_ENABLE);
 251 }
 252
 253 static int ndesc_get_tx_timestamp_status(struct dma_desc *p)
 254 {
 255         return (le32_to_cpu(p->des0) & TDES0_TIME_STAMP_STATUS) >> 17;
 256 }
 257
 258 static void ndesc_get_timestamp(void *desc, u32 ats, u64 *ts)
 259 {
 260         struct dma_desc *p = (struct dma_desc *)desc;
 261         u64 ns;
 262
 263         ns = le32_to_cpu(p->des2);
 264         /* convert high/sec time stamp value to nanosecond */
 265         ns += le32_to_cpu(p->des3) * 1000000000ULL;
 266
 267         *ts = ns;
 268 }
 269
 270 static int ndesc_get_rx_timestamp_status(void *desc, void *next_desc, u32 ats)
 271 {
 272         struct dma_desc *p = (struct dma_desc *)desc;
 273
 274         if ((le32_to_cpu(p->des2) == 0xffffffff) &&
 275             (le32_to_cpu(p->des3) == 0xffffffff))
 276                 /* timestamp is corrupted, hence don't store it */
 277                 return 0;
 278         else
 279                 return 1;
 280 }
 281
 282 static void ndesc_display_ring(void *head, unsigned int size, bool rx)
 283 {
 284         struct dma_desc *p = (struct dma_desc *)head;
 285         int i;
 286
 287         pr_info("%s descriptor ring:\n", rx ? "RX" : "TX");
 288
 289         for (i = 0; i < size; i++) {
 290                 u64 x;
 291
 292                 x = *(u64 *)p;
 293                 pr_info("%03d [0x%x]: 0x%x 0x%x 0x%x 0x%x",
 294                         i, (unsigned int)virt_to_phys(p),
 295                         (unsigned int)x, (unsigned int)(x >> 32),
 296                         p->des2, p->des3);
 297                 p++;
 298         }
 299         pr_info("\n");
 300 }
 301
 302 static void ndesc_get_addr(struct dma_desc *p, unsigned int *addr)
 303 {
 304         *addr = le32_to_cpu(p->des2);
 305 }
 306
 307 static void ndesc_set_addr(struct dma_desc *p, dma_addr_t addr)
 308 {
 309         p->des2 = cpu_to_le32(addr);
 310 }
 311
 312 static void ndesc_clear(struct dma_desc *p)
 313 {
 314         p->des2 = 0;
 315 }
 316
 317 const struct stmmac_desc_ops ndesc_ops = {
 318         .tx_status = ndesc_get_tx_status,
 319         .rx_status = ndesc_get_rx_status,
 320         .get_tx_len = ndesc_get_tx_len,
 321         .init_rx_desc = ndesc_init_rx_desc,
 322         .init_tx_desc = ndesc_init_tx_desc,
 323         .get_tx_owner = ndesc_get_tx_owner,
 324         .release_tx_desc = ndesc_release_tx_desc,
 325         .prepare_tx_desc = ndesc_prepare_tx_desc,
 326         .set_tx_ic = ndesc_set_tx_ic,
 327         .get_tx_ls = ndesc_get_tx_ls,
 328         .set_tx_owner = ndesc_set_tx_owner,
 329         .set_rx_owner = ndesc_set_rx_owner,
 330         .get_rx_frame_len = ndesc_get_rx_frame_len,
 331         .enable_tx_timestamp = ndesc_enable_tx_timestamp,
 332         .get_tx_timestamp_status = ndesc_get_tx_timestamp_status,
 333         .get_timestamp = ndesc_get_timestamp,
 334         .get_rx_timestamp_status = ndesc_get_rx_timestamp_status,
 335         .display_ring = ndesc_display_ring,
 336         .get_addr = ndesc_get_addr,
 337         .set_addr = ndesc_set_addr,
 338         .clear = ndesc_clear,
 339 };