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 The full GNU General Public License is included in this distribution in
16 the file called "COPYING".
18 Author: Giuseppe Cavallaro <peppe.cavallaro@st.com>
19 *******************************************************************************/
21 #include <linux/stmmac.h>
23 #include "descs_com.h"
25 static int ndesc_get_tx_status(void *data
, struct stmmac_extra_stats
*x
,
26 struct dma_desc
*p
, void __iomem
*ioaddr
)
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
);
33 /* Get tx owner first */
34 if (unlikely(tdes0
& TDES0_OWN
))
37 /* Verify tx error by looking at the last segment. */
38 if (likely(!(tdes1
& TDES1_LAST_SEGMENT
)))
41 if (unlikely(tdes0
& TDES0_ERROR_SUMMARY
)) {
42 if (unlikely(tdes0
& TDES0_UNDERFLOW_ERROR
)) {
44 stats
->tx_fifo_errors
++;
46 if (unlikely(tdes0
& TDES0_NO_CARRIER
)) {
48 stats
->tx_carrier_errors
++;
50 if (unlikely(tdes0
& TDES0_LOSS_CARRIER
)) {
52 stats
->tx_carrier_errors
++;
54 if (unlikely((tdes0
& TDES0_EXCESSIVE_DEFERRAL
) ||
55 (tdes0
& TDES0_EXCESSIVE_COLLISIONS
) ||
56 (tdes0
& TDES0_LATE_COLLISION
))) {
57 unsigned int collisions
;
59 collisions
= (tdes0
& TDES0_COLLISION_COUNT_MASK
) >> 3;
60 stats
->collisions
+= collisions
;
65 if (tdes0
& TDES0_VLAN_FRAME
)
68 if (unlikely(tdes0
& TDES0_DEFERRED
))
74 static int ndesc_get_tx_len(struct dma_desc
*p
)
76 return (le32_to_cpu(p
->des1
) & RDES1_BUFFER1_SIZE_MASK
);
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
,
87 unsigned int rdes0
= le32_to_cpu(p
->des0
);
88 struct net_device_stats
*stats
= (struct net_device_stats
*)data
;
90 if (unlikely(rdes0
& RDES0_OWN
))
93 if (unlikely(!(rdes0
& RDES0_LAST_DESCRIPTOR
))) {
94 stats
->rx_length_errors
++;
98 if (unlikely(rdes0
& RDES0_ERROR_SUMMARY
)) {
99 if (unlikely(rdes0
& RDES0_DESCRIPTOR_ERROR
))
101 if (unlikely(rdes0
& RDES0_SA_FILTER_FAIL
))
103 if (unlikely(rdes0
& RDES0_OVERFLOW_ERROR
))
105 if (unlikely(rdes0
& RDES0_IPC_CSUM_ERROR
))
107 if (unlikely(rdes0
& RDES0_COLLISION
)) {
111 if (unlikely(rdes0
& RDES0_CRC_ERROR
)) {
113 stats
->rx_crc_errors
++;
117 if (unlikely(rdes0
& RDES0_DRIBBLING
))
120 if (unlikely(rdes0
& RDES0_LENGTH_ERROR
)) {
124 if (unlikely(rdes0
& RDES0_MII_ERROR
)) {
128 #ifdef STMMAC_VLAN_TAG_USED
129 if (rdes0
& RDES0_VLAN_TAG
)
135 static void ndesc_init_rx_desc(struct dma_desc
*p
, int disable_rx_ic
, int mode
,
140 p
->des0
|= cpu_to_le32(RDES0_OWN
);
142 bfsize1
= min(bfsize
, BUF_SIZE_2KiB
- 1);
143 p
->des1
|= cpu_to_le32(bfsize
& RDES1_BUFFER1_SIZE_MASK
);
145 if (mode
== STMMAC_CHAIN_MODE
)
146 ndesc_rx_set_on_chain(p
, end
);
148 ndesc_rx_set_on_ring(p
, end
, bfsize
);
151 p
->des1
|= cpu_to_le32(RDES1_DISABLE_IC
);
154 static void ndesc_init_tx_desc(struct dma_desc
*p
, int mode
, int end
)
156 p
->des0
&= cpu_to_le32(~TDES0_OWN
);
157 if (mode
== STMMAC_CHAIN_MODE
)
158 ndesc_tx_set_on_chain(p
);
160 ndesc_end_tx_desc_on_ring(p
, end
);
163 static int ndesc_get_tx_owner(struct dma_desc
*p
)
165 return (le32_to_cpu(p
->des0
) & TDES0_OWN
) >> 31;
168 static void ndesc_set_tx_owner(struct dma_desc
*p
)
170 p
->des0
|= cpu_to_le32(TDES0_OWN
);
173 static void ndesc_set_rx_owner(struct dma_desc
*p
, int disable_rx_ic
)
175 p
->des0
|= cpu_to_le32(RDES0_OWN
);
178 static int ndesc_get_tx_ls(struct dma_desc
*p
)
180 return (le32_to_cpu(p
->des1
) & TDES1_LAST_SEGMENT
) >> 30;
183 static void ndesc_release_tx_desc(struct dma_desc
*p
, int mode
)
185 int ter
= (le32_to_cpu(p
->des1
) & TDES1_END_RING
) >> 25;
187 memset(p
, 0, offsetof(struct dma_desc
, des2
));
188 if (mode
== STMMAC_CHAIN_MODE
)
189 ndesc_tx_set_on_chain(p
);
191 ndesc_end_tx_desc_on_ring(p
, ter
);
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
)
198 unsigned int tdes1
= le32_to_cpu(p
->des1
);
201 tdes1
|= TDES1_FIRST_SEGMENT
;
203 tdes1
&= ~TDES1_FIRST_SEGMENT
;
205 if (likely(csum_flag
))
206 tdes1
|= (TX_CIC_FULL
) << TDES1_CHECKSUM_INSERTION_SHIFT
;
208 tdes1
&= ~(TX_CIC_FULL
<< TDES1_CHECKSUM_INSERTION_SHIFT
);
211 tdes1
|= TDES1_LAST_SEGMENT
;
213 p
->des1
= cpu_to_le32(tdes1
);
215 if (mode
== STMMAC_CHAIN_MODE
)
216 norm_set_tx_desc_len_on_chain(p
, len
);
218 norm_set_tx_desc_len_on_ring(p
, len
);
221 p
->des0
|= cpu_to_le32(TDES0_OWN
);
224 static void ndesc_set_tx_ic(struct dma_desc
*p
)
226 p
->des1
|= cpu_to_le32(TDES1_INTERRUPT
);
229 static int ndesc_get_rx_frame_len(struct dma_desc
*p
, int rx_coe_type
)
231 unsigned int csum
= 0;
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
236 * Adjust for that in the framelen for type-1 checksum offload
239 if (rx_coe_type
== STMMAC_RX_COE_TYPE1
)
242 return (((le32_to_cpu(p
->des0
) & RDES0_FRAME_LEN_MASK
)
243 >> RDES0_FRAME_LEN_SHIFT
) -
248 static void ndesc_enable_tx_timestamp(struct dma_desc
*p
)
250 p
->des1
|= cpu_to_le32(TDES1_TIME_STAMP_ENABLE
);
253 static int ndesc_get_tx_timestamp_status(struct dma_desc
*p
)
255 return (le32_to_cpu(p
->des0
) & TDES0_TIME_STAMP_STATUS
) >> 17;
258 static void ndesc_get_timestamp(void *desc
, u32 ats
, u64
*ts
)
260 struct dma_desc
*p
= (struct dma_desc
*)desc
;
263 ns
= le32_to_cpu(p
->des2
);
264 /* convert high/sec time stamp value to nanosecond */
265 ns
+= le32_to_cpu(p
->des3
) * 1000000000ULL;
270 static int ndesc_get_rx_timestamp_status(void *desc
, void *next_desc
, u32 ats
)
272 struct dma_desc
*p
= (struct dma_desc
*)desc
;
274 if ((le32_to_cpu(p
->des2
) == 0xffffffff) &&
275 (le32_to_cpu(p
->des3
) == 0xffffffff))
276 /* timestamp is corrupted, hence don't store it */
282 static void ndesc_display_ring(void *head
, unsigned int size
, bool rx
)
284 struct dma_desc
*p
= (struct dma_desc
*)head
;
287 pr_info("%s descriptor ring:\n", rx
? "RX" : "TX");
289 for (i
= 0; i
< size
; i
++) {
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),
302 static void ndesc_get_addr(struct dma_desc
*p
, unsigned int *addr
)
304 *addr
= le32_to_cpu(p
->des2
);
307 static void ndesc_set_addr(struct dma_desc
*p
, dma_addr_t addr
)
309 p
->des2
= cpu_to_le32(addr
);
312 static void ndesc_clear(struct dma_desc
*p
)
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
,