1 /*******************************************************************************
2 This contains the functions to handle the normal descriptors.
4 Copyright (C) 2007-2009 STMicroelectronics Ltd
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.
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
15 You should have received a copy of the GNU General Public License along with
16 this program; if not, write to the Free Software Foundation, Inc.,
17 51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA.
19 The full GNU General Public License is included in this distribution in
20 the file called "COPYING".
22 Author: Giuseppe Cavallaro <peppe.cavallaro@st.com>
23 *******************************************************************************/
25 #include <linux/stmmac.h>
27 #include "descs_com.h"
29 static int ndesc_get_tx_status(void *data
, struct stmmac_extra_stats
*x
,
30 struct dma_desc
*p
, void __iomem
*ioaddr
)
32 struct net_device_stats
*stats
= (struct net_device_stats
*)data
;
33 unsigned int tdes0
= p
->des0
;
34 unsigned int tdes1
= p
->des1
;
37 /* Get tx owner first */
38 if (unlikely(tdes0
& TDES0_OWN
))
41 /* Verify tx error by looking at the last segment. */
42 if (likely(!(tdes1
& TDES1_LAST_SEGMENT
)))
45 if (unlikely(tdes0
& TDES0_ERROR_SUMMARY
)) {
46 if (unlikely(tdes0
& TDES0_UNDERFLOW_ERROR
)) {
48 stats
->tx_fifo_errors
++;
50 if (unlikely(tdes0
& TDES0_NO_CARRIER
)) {
52 stats
->tx_carrier_errors
++;
54 if (unlikely(tdes0
& TDES0_LOSS_CARRIER
)) {
56 stats
->tx_carrier_errors
++;
58 if (unlikely((tdes0
& TDES0_EXCESSIVE_DEFERRAL
) ||
59 (tdes0
& TDES0_EXCESSIVE_COLLISIONS
) ||
60 (tdes0
& TDES0_LATE_COLLISION
))) {
61 unsigned int collisions
;
63 collisions
= (tdes0
& TDES0_COLLISION_COUNT_MASK
) >> 3;
64 stats
->collisions
+= collisions
;
69 if (tdes0
& TDES0_VLAN_FRAME
)
72 if (unlikely(tdes0
& TDES0_DEFERRED
))
78 static int ndesc_get_tx_len(struct dma_desc
*p
)
80 return (p
->des1
& RDES1_BUFFER1_SIZE_MASK
);
83 /* This function verifies if each incoming frame has some errors
84 * and, if required, updates the multicast statistics.
85 * In case of success, it returns good_frame because the GMAC device
86 * is supposed to be able to compute the csum in HW. */
87 static int ndesc_get_rx_status(void *data
, struct stmmac_extra_stats
*x
,
91 unsigned int rdes0
= p
->des0
;
92 struct net_device_stats
*stats
= (struct net_device_stats
*)data
;
94 if (unlikely(rdes0
& RDES0_OWN
))
97 if (unlikely(!(rdes0
& RDES0_LAST_DESCRIPTOR
))) {
98 pr_warn("%s: Oversized frame spanned multiple buffers\n",
100 stats
->rx_length_errors
++;
101 return discard_frame
;
104 if (unlikely(rdes0
& RDES0_ERROR_SUMMARY
)) {
105 if (unlikely(rdes0
& RDES0_DESCRIPTOR_ERROR
))
107 if (unlikely(rdes0
& RDES0_SA_FILTER_FAIL
))
109 if (unlikely(rdes0
& RDES0_OVERFLOW_ERROR
))
111 if (unlikely(rdes0
& RDES0_IPC_CSUM_ERROR
))
113 if (unlikely(rdes0
& RDES0_COLLISION
)) {
117 if (unlikely(rdes0
& RDES0_CRC_ERROR
)) {
119 stats
->rx_crc_errors
++;
123 if (unlikely(rdes0
& RDES0_DRIBBLING
))
126 if (unlikely(rdes0
& RDES0_LENGTH_ERROR
)) {
130 if (unlikely(rdes0
& RDES0_MII_ERROR
)) {
134 #ifdef STMMAC_VLAN_TAG_USED
135 if (rdes0
& RDES0_VLAN_TAG
)
141 static void ndesc_init_rx_desc(struct dma_desc
*p
, int disable_rx_ic
, int mode
,
144 p
->des0
|= RDES0_OWN
;
145 p
->des1
|= (BUF_SIZE_2KiB
- 1) & RDES1_BUFFER1_SIZE_MASK
;
147 if (mode
== STMMAC_CHAIN_MODE
)
148 ndesc_rx_set_on_chain(p
, end
);
150 ndesc_rx_set_on_ring(p
, end
);
153 p
->des1
|= RDES1_DISABLE_IC
;
156 static void ndesc_init_tx_desc(struct dma_desc
*p
, int mode
, int end
)
158 p
->des0
&= ~TDES0_OWN
;
159 if (mode
== STMMAC_CHAIN_MODE
)
160 ndesc_tx_set_on_chain(p
);
162 ndesc_end_tx_desc_on_ring(p
, end
);
165 static int ndesc_get_tx_owner(struct dma_desc
*p
)
167 return (p
->des0
& TDES0_OWN
) >> 31;
170 static void ndesc_set_tx_owner(struct dma_desc
*p
)
172 p
->des0
|= TDES0_OWN
;
175 static void ndesc_set_rx_owner(struct dma_desc
*p
)
177 p
->des0
|= RDES0_OWN
;
180 static int ndesc_get_tx_ls(struct dma_desc
*p
)
182 return (p
->des1
& TDES1_LAST_SEGMENT
) >> 30;
185 static void ndesc_release_tx_desc(struct dma_desc
*p
, int mode
)
187 int ter
= (p
->des1
& TDES1_END_RING
) >> 25;
189 memset(p
, 0, offsetof(struct dma_desc
, des2
));
190 if (mode
== STMMAC_CHAIN_MODE
)
191 ndesc_tx_set_on_chain(p
);
193 ndesc_end_tx_desc_on_ring(p
, ter
);
196 static void ndesc_prepare_tx_desc(struct dma_desc
*p
, int is_fs
, int len
,
197 bool csum_flag
, int mode
, bool tx_own
,
200 unsigned int tdes1
= p
->des1
;
203 tdes1
|= TDES1_FIRST_SEGMENT
;
205 tdes1
&= ~TDES1_FIRST_SEGMENT
;
207 if (likely(csum_flag
))
208 tdes1
|= (TX_CIC_FULL
) << TDES1_CHECKSUM_INSERTION_SHIFT
;
210 tdes1
&= ~(TX_CIC_FULL
<< TDES1_CHECKSUM_INSERTION_SHIFT
);
213 tdes1
|= TDES1_LAST_SEGMENT
;
217 if (mode
== STMMAC_CHAIN_MODE
)
218 norm_set_tx_desc_len_on_chain(p
, len
);
220 norm_set_tx_desc_len_on_ring(p
, len
);
223 p
->des0
|= TDES0_OWN
;
226 static void ndesc_set_tx_ic(struct dma_desc
*p
)
228 p
->des1
|= TDES1_INTERRUPT
;
231 static int ndesc_get_rx_frame_len(struct dma_desc
*p
, int rx_coe_type
)
233 unsigned int csum
= 0;
235 /* The type-1 checksum offload engines append the checksum at
236 * the end of frame and the two bytes of checksum are added in
238 * Adjust for that in the framelen for type-1 checksum offload
241 if (rx_coe_type
== STMMAC_RX_COE_TYPE1
)
244 return (((p
->des0
& RDES0_FRAME_LEN_MASK
) >> RDES0_FRAME_LEN_SHIFT
) -
249 static void ndesc_enable_tx_timestamp(struct dma_desc
*p
)
251 p
->des1
|= TDES1_TIME_STAMP_ENABLE
;
254 static int ndesc_get_tx_timestamp_status(struct dma_desc
*p
)
256 return (p
->des0
& TDES0_TIME_STAMP_STATUS
) >> 17;
259 static u64
ndesc_get_timestamp(void *desc
, u32 ats
)
261 struct dma_desc
*p
= (struct dma_desc
*)desc
;
265 /* convert high/sec time stamp value to nanosecond */
266 ns
+= p
->des3
* 1000000000ULL;
271 static int ndesc_get_rx_timestamp_status(void *desc
, u32 ats
)
273 struct dma_desc
*p
= (struct dma_desc
*)desc
;
275 if ((p
->des2
== 0xffffffff) && (p
->des3
== 0xffffffff))
276 /* timestamp is corrupted, hence don't store it */
282 const struct stmmac_desc_ops ndesc_ops
= {
283 .tx_status
= ndesc_get_tx_status
,
284 .rx_status
= ndesc_get_rx_status
,
285 .get_tx_len
= ndesc_get_tx_len
,
286 .init_rx_desc
= ndesc_init_rx_desc
,
287 .init_tx_desc
= ndesc_init_tx_desc
,
288 .get_tx_owner
= ndesc_get_tx_owner
,
289 .release_tx_desc
= ndesc_release_tx_desc
,
290 .prepare_tx_desc
= ndesc_prepare_tx_desc
,
291 .set_tx_ic
= ndesc_set_tx_ic
,
292 .get_tx_ls
= ndesc_get_tx_ls
,
293 .set_tx_owner
= ndesc_set_tx_owner
,
294 .set_rx_owner
= ndesc_set_rx_owner
,
295 .get_rx_frame_len
= ndesc_get_rx_frame_len
,
296 .enable_tx_timestamp
= ndesc_enable_tx_timestamp
,
297 .get_tx_timestamp_status
= ndesc_get_tx_timestamp_status
,
298 .get_timestamp
= ndesc_get_timestamp
,
299 .get_rx_timestamp_status
= ndesc_get_rx_timestamp_status
,