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n_tty: Reduce branching in canon_copy_from_read_buf()
[linux/fpc-iii.git] / drivers / net / ethernet / calxeda / xgmac.c
blob63efa0dc45ba61b11f8e1a245513485412e50027
1 /*
2 * Copyright 2010-2011 Calxeda, Inc.
3 *
4 * This program is free software; you can redistribute it and/or modify it
5 * under the terms and conditions of the GNU General Public License,
6 * version 2, as published by the Free Software Foundation.
7 *
8 * This program is distributed in the hope it will be useful, but WITHOUT
9 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
10 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
11 * more details.
12 *
13 * You should have received a copy of the GNU General Public License along with
14 * this program. If not, see <http://www.gnu.org/licenses/>.
15 */
16 #include <linux/module.h>
17 #include <linux/kernel.h>
18 #include <linux/circ_buf.h>
19 #include <linux/interrupt.h>
20 #include <linux/etherdevice.h>
21 #include <linux/platform_device.h>
22 #include <linux/skbuff.h>
23 #include <linux/ethtool.h>
24 #include <linux/if.h>
25 #include <linux/crc32.h>
26 #include <linux/dma-mapping.h>
27 #include <linux/slab.h>
28
29 /* XGMAC Register definitions */
30 #define XGMAC_CONTROL 0x00000000 /* MAC Configuration */
31 #define XGMAC_FRAME_FILTER 0x00000004 /* MAC Frame Filter */
32 #define XGMAC_FLOW_CTRL 0x00000018 /* MAC Flow Control */
33 #define XGMAC_VLAN_TAG 0x0000001C /* VLAN Tags */
34 #define XGMAC_VERSION 0x00000020 /* Version */
35 #define XGMAC_VLAN_INCL 0x00000024 /* VLAN tag for tx frames */
36 #define XGMAC_LPI_CTRL 0x00000028 /* LPI Control and Status */
37 #define XGMAC_LPI_TIMER 0x0000002C /* LPI Timers Control */
38 #define XGMAC_TX_PACE 0x00000030 /* Transmit Pace and Stretch */
39 #define XGMAC_VLAN_HASH 0x00000034 /* VLAN Hash Table */
40 #define XGMAC_DEBUG 0x00000038 /* Debug */
41 #define XGMAC_INT_STAT 0x0000003C /* Interrupt and Control */
42 #define XGMAC_ADDR_HIGH(reg) (0x00000040 + ((reg) * 8))
43 #define XGMAC_ADDR_LOW(reg) (0x00000044 + ((reg) * 8))
44 #define XGMAC_HASH(n) (0x00000300 + (n) * 4) /* HASH table regs */
45 #define XGMAC_NUM_HASH 16
46 #define XGMAC_OMR 0x00000400
47 #define XGMAC_REMOTE_WAKE 0x00000700 /* Remote Wake-Up Frm Filter */
48 #define XGMAC_PMT 0x00000704 /* PMT Control and Status */
49 #define XGMAC_MMC_CTRL 0x00000800 /* XGMAC MMC Control */
50 #define XGMAC_MMC_INTR_RX 0x00000804 /* Receive Interrupt */
51 #define XGMAC_MMC_INTR_TX 0x00000808 /* Transmit Interrupt */
52 #define XGMAC_MMC_INTR_MASK_RX 0x0000080c /* Receive Interrupt Mask */
53 #define XGMAC_MMC_INTR_MASK_TX 0x00000810 /* Transmit Interrupt Mask */
54
55 /* Hardware TX Statistics Counters */
56 #define XGMAC_MMC_TXOCTET_GB_LO 0x00000814
57 #define XGMAC_MMC_TXOCTET_GB_HI 0x00000818
58 #define XGMAC_MMC_TXFRAME_GB_LO 0x0000081C
59 #define XGMAC_MMC_TXFRAME_GB_HI 0x00000820
60 #define XGMAC_MMC_TXBCFRAME_G 0x00000824
61 #define XGMAC_MMC_TXMCFRAME_G 0x0000082C
62 #define XGMAC_MMC_TXUCFRAME_GB 0x00000864
63 #define XGMAC_MMC_TXMCFRAME_GB 0x0000086C
64 #define XGMAC_MMC_TXBCFRAME_GB 0x00000874
65 #define XGMAC_MMC_TXUNDERFLOW 0x0000087C
66 #define XGMAC_MMC_TXOCTET_G_LO 0x00000884
67 #define XGMAC_MMC_TXOCTET_G_HI 0x00000888
68 #define XGMAC_MMC_TXFRAME_G_LO 0x0000088C
69 #define XGMAC_MMC_TXFRAME_G_HI 0x00000890
70 #define XGMAC_MMC_TXPAUSEFRAME 0x00000894
71 #define XGMAC_MMC_TXVLANFRAME 0x0000089C
72
73 /* Hardware RX Statistics Counters */
74 #define XGMAC_MMC_RXFRAME_GB_LO 0x00000900
75 #define XGMAC_MMC_RXFRAME_GB_HI 0x00000904
76 #define XGMAC_MMC_RXOCTET_GB_LO 0x00000908
77 #define XGMAC_MMC_RXOCTET_GB_HI 0x0000090C
78 #define XGMAC_MMC_RXOCTET_G_LO 0x00000910
79 #define XGMAC_MMC_RXOCTET_G_HI 0x00000914
80 #define XGMAC_MMC_RXBCFRAME_G 0x00000918
81 #define XGMAC_MMC_RXMCFRAME_G 0x00000920
82 #define XGMAC_MMC_RXCRCERR 0x00000928
83 #define XGMAC_MMC_RXRUNT 0x00000930
84 #define XGMAC_MMC_RXJABBER 0x00000934
85 #define XGMAC_MMC_RXUCFRAME_G 0x00000970
86 #define XGMAC_MMC_RXLENGTHERR 0x00000978
87 #define XGMAC_MMC_RXPAUSEFRAME 0x00000988
88 #define XGMAC_MMC_RXOVERFLOW 0x00000990
89 #define XGMAC_MMC_RXVLANFRAME 0x00000998
90 #define XGMAC_MMC_RXWATCHDOG 0x000009a0
91
92 /* DMA Control and Status Registers */
93 #define XGMAC_DMA_BUS_MODE 0x00000f00 /* Bus Mode */
94 #define XGMAC_DMA_TX_POLL 0x00000f04 /* Transmit Poll Demand */
95 #define XGMAC_DMA_RX_POLL 0x00000f08 /* Received Poll Demand */
96 #define XGMAC_DMA_RX_BASE_ADDR 0x00000f0c /* Receive List Base */
97 #define XGMAC_DMA_TX_BASE_ADDR 0x00000f10 /* Transmit List Base */
98 #define XGMAC_DMA_STATUS 0x00000f14 /* Status Register */
99 #define XGMAC_DMA_CONTROL 0x00000f18 /* Ctrl (Operational Mode) */
100 #define XGMAC_DMA_INTR_ENA 0x00000f1c /* Interrupt Enable */
101 #define XGMAC_DMA_MISS_FRAME_CTR 0x00000f20 /* Missed Frame Counter */
102 #define XGMAC_DMA_RI_WDOG_TIMER 0x00000f24 /* RX Intr Watchdog Timer */
103 #define XGMAC_DMA_AXI_BUS 0x00000f28 /* AXI Bus Mode */
104 #define XGMAC_DMA_AXI_STATUS 0x00000f2C /* AXI Status */
105 #define XGMAC_DMA_HW_FEATURE 0x00000f58 /* Enabled Hardware Features */
106
107 #define XGMAC_ADDR_AE 0x80000000
108
109 /* PMT Control and Status */
110 #define XGMAC_PMT_POINTER_RESET 0x80000000
111 #define XGMAC_PMT_GLBL_UNICAST 0x00000200
112 #define XGMAC_PMT_WAKEUP_RX_FRM 0x00000040
113 #define XGMAC_PMT_MAGIC_PKT 0x00000020
114 #define XGMAC_PMT_WAKEUP_FRM_EN 0x00000004
115 #define XGMAC_PMT_MAGIC_PKT_EN 0x00000002
116 #define XGMAC_PMT_POWERDOWN 0x00000001
117
118 #define XGMAC_CONTROL_SPD 0x40000000 /* Speed control */
119 #define XGMAC_CONTROL_SPD_MASK 0x60000000
120 #define XGMAC_CONTROL_SPD_1G 0x60000000
121 #define XGMAC_CONTROL_SPD_2_5G 0x40000000
122 #define XGMAC_CONTROL_SPD_10G 0x00000000
123 #define XGMAC_CONTROL_SARC 0x10000000 /* Source Addr Insert/Replace */
124 #define XGMAC_CONTROL_SARK_MASK 0x18000000
125 #define XGMAC_CONTROL_CAR 0x04000000 /* CRC Addition/Replacement */
126 #define XGMAC_CONTROL_CAR_MASK 0x06000000
127 #define XGMAC_CONTROL_DP 0x01000000 /* Disable Padding */
128 #define XGMAC_CONTROL_WD 0x00800000 /* Disable Watchdog on rx */
129 #define XGMAC_CONTROL_JD 0x00400000 /* Jabber disable */
130 #define XGMAC_CONTROL_JE 0x00100000 /* Jumbo frame */
131 #define XGMAC_CONTROL_LM 0x00001000 /* Loop-back mode */
132 #define XGMAC_CONTROL_IPC 0x00000400 /* Checksum Offload */
133 #define XGMAC_CONTROL_ACS 0x00000080 /* Automatic Pad/FCS Strip */
134 #define XGMAC_CONTROL_DDIC 0x00000010 /* Disable Deficit Idle Count */
135 #define XGMAC_CONTROL_TE 0x00000008 /* Transmitter Enable */
136 #define XGMAC_CONTROL_RE 0x00000004 /* Receiver Enable */
137
138 /* XGMAC Frame Filter defines */
139 #define XGMAC_FRAME_FILTER_PR 0x00000001 /* Promiscuous Mode */
140 #define XGMAC_FRAME_FILTER_HUC 0x00000002 /* Hash Unicast */
141 #define XGMAC_FRAME_FILTER_HMC 0x00000004 /* Hash Multicast */
142 #define XGMAC_FRAME_FILTER_DAIF 0x00000008 /* DA Inverse Filtering */
143 #define XGMAC_FRAME_FILTER_PM 0x00000010 /* Pass all multicast */
144 #define XGMAC_FRAME_FILTER_DBF 0x00000020 /* Disable Broadcast frames */
145 #define XGMAC_FRAME_FILTER_SAIF 0x00000100 /* Inverse Filtering */
146 #define XGMAC_FRAME_FILTER_SAF 0x00000200 /* Source Address Filter */
147 #define XGMAC_FRAME_FILTER_HPF 0x00000400 /* Hash or perfect Filter */
148 #define XGMAC_FRAME_FILTER_VHF 0x00000800 /* VLAN Hash Filter */
149 #define XGMAC_FRAME_FILTER_VPF 0x00001000 /* VLAN Perfect Filter */
150 #define XGMAC_FRAME_FILTER_RA 0x80000000 /* Receive all mode */
151
152 /* XGMAC FLOW CTRL defines */
153 #define XGMAC_FLOW_CTRL_PT_MASK 0xffff0000 /* Pause Time Mask */
154 #define XGMAC_FLOW_CTRL_PT_SHIFT 16
155 #define XGMAC_FLOW_CTRL_DZQP 0x00000080 /* Disable Zero-Quanta Phase */
156 #define XGMAC_FLOW_CTRL_PLT 0x00000020 /* Pause Low Threshold */
157 #define XGMAC_FLOW_CTRL_PLT_MASK 0x00000030 /* PLT MASK */
158 #define XGMAC_FLOW_CTRL_UP 0x00000008 /* Unicast Pause Frame Detect */
159 #define XGMAC_FLOW_CTRL_RFE 0x00000004 /* Rx Flow Control Enable */
160 #define XGMAC_FLOW_CTRL_TFE 0x00000002 /* Tx Flow Control Enable */
161 #define XGMAC_FLOW_CTRL_FCB_BPA 0x00000001 /* Flow Control Busy ... */
162
163 /* XGMAC_INT_STAT reg */
164 #define XGMAC_INT_STAT_PMTIM 0x00800000 /* PMT Interrupt Mask */
165 #define XGMAC_INT_STAT_PMT 0x0080 /* PMT Interrupt Status */
166 #define XGMAC_INT_STAT_LPI 0x0040 /* LPI Interrupt Status */
167
168 /* DMA Bus Mode register defines */
169 #define DMA_BUS_MODE_SFT_RESET 0x00000001 /* Software Reset */
170 #define DMA_BUS_MODE_DSL_MASK 0x0000007c /* Descriptor Skip Length */
171 #define DMA_BUS_MODE_DSL_SHIFT 2 /* (in DWORDS) */
172 #define DMA_BUS_MODE_ATDS 0x00000080 /* Alternate Descriptor Size */
173
174 /* Programmable burst length */
175 #define DMA_BUS_MODE_PBL_MASK 0x00003f00 /* Programmable Burst Len */
176 #define DMA_BUS_MODE_PBL_SHIFT 8
177 #define DMA_BUS_MODE_FB 0x00010000 /* Fixed burst */
178 #define DMA_BUS_MODE_RPBL_MASK 0x003e0000 /* Rx-Programmable Burst Len */
179 #define DMA_BUS_MODE_RPBL_SHIFT 17
180 #define DMA_BUS_MODE_USP 0x00800000
181 #define DMA_BUS_MODE_8PBL 0x01000000
182 #define DMA_BUS_MODE_AAL 0x02000000
183
184 /* DMA Bus Mode register defines */
185 #define DMA_BUS_PR_RATIO_MASK 0x0000c000 /* Rx/Tx priority ratio */
186 #define DMA_BUS_PR_RATIO_SHIFT 14
187 #define DMA_BUS_FB 0x00010000 /* Fixed Burst */
188
189 /* DMA Control register defines */
190 #define DMA_CONTROL_ST 0x00002000 /* Start/Stop Transmission */
191 #define DMA_CONTROL_SR 0x00000002 /* Start/Stop Receive */
192 #define DMA_CONTROL_DFF 0x01000000 /* Disable flush of rx frames */
193 #define DMA_CONTROL_OSF 0x00000004 /* Operate on 2nd tx frame */
194
195 /* DMA Normal interrupt */
196 #define DMA_INTR_ENA_NIE 0x00010000 /* Normal Summary */
197 #define DMA_INTR_ENA_AIE 0x00008000 /* Abnormal Summary */
198 #define DMA_INTR_ENA_ERE 0x00004000 /* Early Receive */
199 #define DMA_INTR_ENA_FBE 0x00002000 /* Fatal Bus Error */
200 #define DMA_INTR_ENA_ETE 0x00000400 /* Early Transmit */
201 #define DMA_INTR_ENA_RWE 0x00000200 /* Receive Watchdog */
202 #define DMA_INTR_ENA_RSE 0x00000100 /* Receive Stopped */
203 #define DMA_INTR_ENA_RUE 0x00000080 /* Receive Buffer Unavailable */
204 #define DMA_INTR_ENA_RIE 0x00000040 /* Receive Interrupt */
205 #define DMA_INTR_ENA_UNE 0x00000020 /* Tx Underflow */
206 #define DMA_INTR_ENA_OVE 0x00000010 /* Receive Overflow */
207 #define DMA_INTR_ENA_TJE 0x00000008 /* Transmit Jabber */
208 #define DMA_INTR_ENA_TUE 0x00000004 /* Transmit Buffer Unavail */
209 #define DMA_INTR_ENA_TSE 0x00000002 /* Transmit Stopped */
210 #define DMA_INTR_ENA_TIE 0x00000001 /* Transmit Interrupt */
211
212 #define DMA_INTR_NORMAL (DMA_INTR_ENA_NIE | DMA_INTR_ENA_RIE | \
213 DMA_INTR_ENA_TUE | DMA_INTR_ENA_TIE)
214
215 #define DMA_INTR_ABNORMAL (DMA_INTR_ENA_AIE | DMA_INTR_ENA_FBE | \
216 DMA_INTR_ENA_RWE | DMA_INTR_ENA_RSE | \
217 DMA_INTR_ENA_RUE | DMA_INTR_ENA_UNE | \
218 DMA_INTR_ENA_OVE | DMA_INTR_ENA_TJE | \
219 DMA_INTR_ENA_TSE)
220
221 /* DMA default interrupt mask */
222 #define DMA_INTR_DEFAULT_MASK (DMA_INTR_NORMAL | DMA_INTR_ABNORMAL)
223
224 /* DMA Status register defines */
225 #define DMA_STATUS_GMI 0x08000000 /* MMC interrupt */
226 #define DMA_STATUS_GLI 0x04000000 /* GMAC Line interface int */
227 #define DMA_STATUS_EB_MASK 0x00380000 /* Error Bits Mask */
228 #define DMA_STATUS_EB_TX_ABORT 0x00080000 /* Error Bits - TX Abort */
229 #define DMA_STATUS_EB_RX_ABORT 0x00100000 /* Error Bits - RX Abort */
230 #define DMA_STATUS_TS_MASK 0x00700000 /* Transmit Process State */
231 #define DMA_STATUS_TS_SHIFT 20
232 #define DMA_STATUS_RS_MASK 0x000e0000 /* Receive Process State */
233 #define DMA_STATUS_RS_SHIFT 17
234 #define DMA_STATUS_NIS 0x00010000 /* Normal Interrupt Summary */
235 #define DMA_STATUS_AIS 0x00008000 /* Abnormal Interrupt Summary */
236 #define DMA_STATUS_ERI 0x00004000 /* Early Receive Interrupt */
237 #define DMA_STATUS_FBI 0x00002000 /* Fatal Bus Error Interrupt */
238 #define DMA_STATUS_ETI 0x00000400 /* Early Transmit Interrupt */
239 #define DMA_STATUS_RWT 0x00000200 /* Receive Watchdog Timeout */
240 #define DMA_STATUS_RPS 0x00000100 /* Receive Process Stopped */
241 #define DMA_STATUS_RU 0x00000080 /* Receive Buffer Unavailable */
242 #define DMA_STATUS_RI 0x00000040 /* Receive Interrupt */
243 #define DMA_STATUS_UNF 0x00000020 /* Transmit Underflow */
244 #define DMA_STATUS_OVF 0x00000010 /* Receive Overflow */
245 #define DMA_STATUS_TJT 0x00000008 /* Transmit Jabber Timeout */
246 #define DMA_STATUS_TU 0x00000004 /* Transmit Buffer Unavail */
247 #define DMA_STATUS_TPS 0x00000002 /* Transmit Process Stopped */
248 #define DMA_STATUS_TI 0x00000001 /* Transmit Interrupt */
249
250 /* Common MAC defines */
251 #define MAC_ENABLE_TX 0x00000008 /* Transmitter Enable */
252 #define MAC_ENABLE_RX 0x00000004 /* Receiver Enable */
253
254 /* XGMAC Operation Mode Register */
255 #define XGMAC_OMR_TSF 0x00200000 /* TX FIFO Store and Forward */
256 #define XGMAC_OMR_FTF 0x00100000 /* Flush Transmit FIFO */
257 #define XGMAC_OMR_TTC 0x00020000 /* Transmit Threshold Ctrl */
258 #define XGMAC_OMR_TTC_MASK 0x00030000
259 #define XGMAC_OMR_RFD 0x00006000 /* FC Deactivation Threshold */
260 #define XGMAC_OMR_RFD_MASK 0x00007000 /* FC Deact Threshold MASK */
261 #define XGMAC_OMR_RFA 0x00000600 /* FC Activation Threshold */
262 #define XGMAC_OMR_RFA_MASK 0x00000E00 /* FC Act Threshold MASK */
263 #define XGMAC_OMR_EFC 0x00000100 /* Enable Hardware FC */
264 #define XGMAC_OMR_FEF 0x00000080 /* Forward Error Frames */
265 #define XGMAC_OMR_DT 0x00000040 /* Drop TCP/IP csum Errors */
266 #define XGMAC_OMR_RSF 0x00000020 /* RX FIFO Store and Forward */
267 #define XGMAC_OMR_RTC_256 0x00000018 /* RX Threshold Ctrl */
268 #define XGMAC_OMR_RTC_MASK 0x00000018 /* RX Threshold Ctrl MASK */
269
270 /* XGMAC HW Features Register */
271 #define DMA_HW_FEAT_TXCOESEL 0x00010000 /* TX Checksum offload */
272
273 #define XGMAC_MMC_CTRL_CNT_FRZ 0x00000008
274
275 /* XGMAC Descriptor Defines */
276 #define MAX_DESC_BUF_SZ (0x2000 - 8)
277
278 #define RXDESC_EXT_STATUS 0x00000001
279 #define RXDESC_CRC_ERR 0x00000002
280 #define RXDESC_RX_ERR 0x00000008
281 #define RXDESC_RX_WDOG 0x00000010
282 #define RXDESC_FRAME_TYPE 0x00000020
283 #define RXDESC_GIANT_FRAME 0x00000080
284 #define RXDESC_LAST_SEG 0x00000100
285 #define RXDESC_FIRST_SEG 0x00000200
286 #define RXDESC_VLAN_FRAME 0x00000400
287 #define RXDESC_OVERFLOW_ERR 0x00000800
288 #define RXDESC_LENGTH_ERR 0x00001000
289 #define RXDESC_SA_FILTER_FAIL 0x00002000
290 #define RXDESC_DESCRIPTOR_ERR 0x00004000
291 #define RXDESC_ERROR_SUMMARY 0x00008000
292 #define RXDESC_FRAME_LEN_OFFSET 16
293 #define RXDESC_FRAME_LEN_MASK 0x3fff0000
294 #define RXDESC_DA_FILTER_FAIL 0x40000000
295
296 #define RXDESC1_END_RING 0x00008000
297
298 #define RXDESC_IP_PAYLOAD_MASK 0x00000003
299 #define RXDESC_IP_PAYLOAD_UDP 0x00000001
300 #define RXDESC_IP_PAYLOAD_TCP 0x00000002
301 #define RXDESC_IP_PAYLOAD_ICMP 0x00000003
302 #define RXDESC_IP_HEADER_ERR 0x00000008
303 #define RXDESC_IP_PAYLOAD_ERR 0x00000010
304 #define RXDESC_IPV4_PACKET 0x00000040
305 #define RXDESC_IPV6_PACKET 0x00000080
306 #define TXDESC_UNDERFLOW_ERR 0x00000001
307 #define TXDESC_JABBER_TIMEOUT 0x00000002
308 #define TXDESC_LOCAL_FAULT 0x00000004
309 #define TXDESC_REMOTE_FAULT 0x00000008
310 #define TXDESC_VLAN_FRAME 0x00000010
311 #define TXDESC_FRAME_FLUSHED 0x00000020
312 #define TXDESC_IP_HEADER_ERR 0x00000040
313 #define TXDESC_PAYLOAD_CSUM_ERR 0x00000080
314 #define TXDESC_ERROR_SUMMARY 0x00008000
315 #define TXDESC_SA_CTRL_INSERT 0x00040000
316 #define TXDESC_SA_CTRL_REPLACE 0x00080000
317 #define TXDESC_2ND_ADDR_CHAINED 0x00100000
318 #define TXDESC_END_RING 0x00200000
319 #define TXDESC_CSUM_IP 0x00400000
320 #define TXDESC_CSUM_IP_PAYLD 0x00800000
321 #define TXDESC_CSUM_ALL 0x00C00000
322 #define TXDESC_CRC_EN_REPLACE 0x01000000
323 #define TXDESC_CRC_EN_APPEND 0x02000000
324 #define TXDESC_DISABLE_PAD 0x04000000
325 #define TXDESC_FIRST_SEG 0x10000000
326 #define TXDESC_LAST_SEG 0x20000000
327 #define TXDESC_INTERRUPT 0x40000000
328
329 #define DESC_OWN 0x80000000
330 #define DESC_BUFFER1_SZ_MASK 0x00001fff
331 #define DESC_BUFFER2_SZ_MASK 0x1fff0000
332 #define DESC_BUFFER2_SZ_OFFSET 16
333
334 struct xgmac_dma_desc {
335 __le32 flags;
336 __le32 buf_size;
337 __le32 buf1_addr; /* Buffer 1 Address Pointer */
338 __le32 buf2_addr; /* Buffer 2 Address Pointer */
339 __le32 ext_status;
340 __le32 res[3];
341 };
342
343 struct xgmac_extra_stats {
344 /* Transmit errors */
345 unsigned long tx_jabber;
346 unsigned long tx_frame_flushed;
347 unsigned long tx_payload_error;
348 unsigned long tx_ip_header_error;
349 unsigned long tx_local_fault;
350 unsigned long tx_remote_fault;
351 /* Receive errors */
352 unsigned long rx_watchdog;
353 unsigned long rx_da_filter_fail;
354 unsigned long rx_payload_error;
355 unsigned long rx_ip_header_error;
356 /* Tx/Rx IRQ errors */
357 unsigned long tx_process_stopped;
358 unsigned long rx_buf_unav;
359 unsigned long rx_process_stopped;
360 unsigned long tx_early;
361 unsigned long fatal_bus_error;
362 };
363
364 struct xgmac_priv {
365 struct xgmac_dma_desc *dma_rx;
366 struct sk_buff **rx_skbuff;
367 unsigned int rx_tail;
368 unsigned int rx_head;
369
370 struct xgmac_dma_desc *dma_tx;
371 struct sk_buff **tx_skbuff;
372 unsigned int tx_head;
373 unsigned int tx_tail;
374 int tx_irq_cnt;
375
376 void __iomem *base;
377 unsigned int dma_buf_sz;
378 dma_addr_t dma_rx_phy;
379 dma_addr_t dma_tx_phy;
380
381 struct net_device *dev;
382 struct device *device;
383 struct napi_struct napi;
384
385 int max_macs;
386 struct xgmac_extra_stats xstats;
387
388 spinlock_t stats_lock;
389 int pmt_irq;
390 char rx_pause;
391 char tx_pause;
392 int wolopts;
393 struct work_struct tx_timeout_work;
394 };
395
396 /* XGMAC Configuration Settings */
397 #define MAX_MTU 9000
398 #define PAUSE_TIME 0x400
399
400 #define DMA_RX_RING_SZ 256
401 #define DMA_TX_RING_SZ 128
402 /* minimum number of free TX descriptors required to wake up TX process */
403 #define TX_THRESH (DMA_TX_RING_SZ/4)
404
405 /* DMA descriptor ring helpers */
406 #define dma_ring_incr(n, s) (((n) + 1) & ((s) - 1))
407 #define dma_ring_space(h, t, s) CIRC_SPACE(h, t, s)
408 #define dma_ring_cnt(h, t, s) CIRC_CNT(h, t, s)
409
410 #define tx_dma_ring_space(p) \
411 dma_ring_space((p)->tx_head, (p)->tx_tail, DMA_TX_RING_SZ)
412
413 /* XGMAC Descriptor Access Helpers */
414 static inline void desc_set_buf_len(struct xgmac_dma_desc *p, u32 buf_sz)
415 {
416 if (buf_sz > MAX_DESC_BUF_SZ)
417 p->buf_size = cpu_to_le32(MAX_DESC_BUF_SZ |
418 (buf_sz - MAX_DESC_BUF_SZ) << DESC_BUFFER2_SZ_OFFSET);
419 else
420 p->buf_size = cpu_to_le32(buf_sz);
421 }
422
423 static inline int desc_get_buf_len(struct xgmac_dma_desc *p)
424 {
425 u32 len = le32_to_cpu(p->buf_size);
426 return (len & DESC_BUFFER1_SZ_MASK) +
427 ((len & DESC_BUFFER2_SZ_MASK) >> DESC_BUFFER2_SZ_OFFSET);
428 }
429
430 static inline void desc_init_rx_desc(struct xgmac_dma_desc *p, int ring_size,
431 int buf_sz)
432 {
433 struct xgmac_dma_desc *end = p + ring_size - 1;
434
435 memset(p, 0, sizeof(*p) * ring_size);
436
437 for (; p <= end; p++)
438 desc_set_buf_len(p, buf_sz);
439
440 end->buf_size |= cpu_to_le32(RXDESC1_END_RING);
441 }
442
443 static inline void desc_init_tx_desc(struct xgmac_dma_desc *p, u32 ring_size)
444 {
445 memset(p, 0, sizeof(*p) * ring_size);
446 p[ring_size - 1].flags = cpu_to_le32(TXDESC_END_RING);
447 }
448
449 static inline int desc_get_owner(struct xgmac_dma_desc *p)
450 {
451 return le32_to_cpu(p->flags) & DESC_OWN;
452 }
453
454 static inline void desc_set_rx_owner(struct xgmac_dma_desc *p)
455 {
456 /* Clear all fields and set the owner */
457 p->flags = cpu_to_le32(DESC_OWN);
458 }
459
460 static inline void desc_set_tx_owner(struct xgmac_dma_desc *p, u32 flags)
461 {
462 u32 tmpflags = le32_to_cpu(p->flags);
463 tmpflags &= TXDESC_END_RING;
464 tmpflags |= flags | DESC_OWN;
465 p->flags = cpu_to_le32(tmpflags);
466 }
467
468 static inline void desc_clear_tx_owner(struct xgmac_dma_desc *p)
469 {
470 u32 tmpflags = le32_to_cpu(p->flags);
471 tmpflags &= TXDESC_END_RING;
472 p->flags = cpu_to_le32(tmpflags);
473 }
474
475 static inline int desc_get_tx_ls(struct xgmac_dma_desc *p)
476 {
477 return le32_to_cpu(p->flags) & TXDESC_LAST_SEG;
478 }
479
480 static inline int desc_get_tx_fs(struct xgmac_dma_desc *p)
481 {
482 return le32_to_cpu(p->flags) & TXDESC_FIRST_SEG;
483 }
484
485 static inline u32 desc_get_buf_addr(struct xgmac_dma_desc *p)
486 {
487 return le32_to_cpu(p->buf1_addr);
488 }
489
490 static inline void desc_set_buf_addr(struct xgmac_dma_desc *p,
491 u32 paddr, int len)
492 {
493 p->buf1_addr = cpu_to_le32(paddr);
494 if (len > MAX_DESC_BUF_SZ)
495 p->buf2_addr = cpu_to_le32(paddr + MAX_DESC_BUF_SZ);
496 }
497
498 static inline void desc_set_buf_addr_and_size(struct xgmac_dma_desc *p,
499 u32 paddr, int len)
500 {
501 desc_set_buf_len(p, len);
502 desc_set_buf_addr(p, paddr, len);
503 }
504
505 static inline int desc_get_rx_frame_len(struct xgmac_dma_desc *p)
506 {
507 u32 data = le32_to_cpu(p->flags);
508 u32 len = (data & RXDESC_FRAME_LEN_MASK) >> RXDESC_FRAME_LEN_OFFSET;
509 if (data & RXDESC_FRAME_TYPE)
510 len -= ETH_FCS_LEN;
511
512 return len;
513 }
514
515 static void xgmac_dma_flush_tx_fifo(void __iomem *ioaddr)
516 {
517 int timeout = 1000;
518 u32 reg = readl(ioaddr + XGMAC_OMR);
519 writel(reg | XGMAC_OMR_FTF, ioaddr + XGMAC_OMR);
520
521 while ((timeout-- > 0) && readl(ioaddr + XGMAC_OMR) & XGMAC_OMR_FTF)
522 udelay(1);
523 }
524
525 static int desc_get_tx_status(struct xgmac_priv *priv, struct xgmac_dma_desc *p)
526 {
527 struct xgmac_extra_stats *x = &priv->xstats;
528 u32 status = le32_to_cpu(p->flags);
529
530 if (!(status & TXDESC_ERROR_SUMMARY))
531 return 0;
532
533 netdev_dbg(priv->dev, "tx desc error = 0x%08x\n", status);
534 if (status & TXDESC_JABBER_TIMEOUT)
535 x->tx_jabber++;
536 if (status & TXDESC_FRAME_FLUSHED)
537 x->tx_frame_flushed++;
538 if (status & TXDESC_UNDERFLOW_ERR)
539 xgmac_dma_flush_tx_fifo(priv->base);
540 if (status & TXDESC_IP_HEADER_ERR)
541 x->tx_ip_header_error++;
542 if (status & TXDESC_LOCAL_FAULT)
543 x->tx_local_fault++;
544 if (status & TXDESC_REMOTE_FAULT)
545 x->tx_remote_fault++;
546 if (status & TXDESC_PAYLOAD_CSUM_ERR)
547 x->tx_payload_error++;
548
549 return -1;
550 }
551
552 static int desc_get_rx_status(struct xgmac_priv *priv, struct xgmac_dma_desc *p)
553 {
554 struct xgmac_extra_stats *x = &priv->xstats;
555 int ret = CHECKSUM_UNNECESSARY;
556 u32 status = le32_to_cpu(p->flags);
557 u32 ext_status = le32_to_cpu(p->ext_status);
558
559 if (status & RXDESC_DA_FILTER_FAIL) {
560 netdev_dbg(priv->dev, "XGMAC RX : Dest Address filter fail\n");
561 x->rx_da_filter_fail++;
562 return -1;
563 }
564
565 /* All frames should fit into a single buffer */
566 if (!(status & RXDESC_FIRST_SEG) || !(status & RXDESC_LAST_SEG))
567 return -1;
568
569 /* Check if packet has checksum already */
570 if ((status & RXDESC_FRAME_TYPE) && (status & RXDESC_EXT_STATUS) &&
571 !(ext_status & RXDESC_IP_PAYLOAD_MASK))
572 ret = CHECKSUM_NONE;
573
574 netdev_dbg(priv->dev, "rx status - frame type=%d, csum = %d, ext stat %08x\n",
575 (status & RXDESC_FRAME_TYPE) ? 1 : 0, ret, ext_status);
576
577 if (!(status & RXDESC_ERROR_SUMMARY))
578 return ret;
579
580 /* Handle any errors */
581 if (status & (RXDESC_DESCRIPTOR_ERR | RXDESC_OVERFLOW_ERR |
582 RXDESC_GIANT_FRAME | RXDESC_LENGTH_ERR | RXDESC_CRC_ERR))
583 return -1;
584
585 if (status & RXDESC_EXT_STATUS) {
586 if (ext_status & RXDESC_IP_HEADER_ERR)
587 x->rx_ip_header_error++;
588 if (ext_status & RXDESC_IP_PAYLOAD_ERR)
589 x->rx_payload_error++;
590 netdev_dbg(priv->dev, "IP checksum error - stat %08x\n",
591 ext_status);
592 return CHECKSUM_NONE;
593 }
594
595 return ret;
596 }
597
598 static inline void xgmac_mac_enable(void __iomem *ioaddr)
599 {
600 u32 value = readl(ioaddr + XGMAC_CONTROL);
601 value |= MAC_ENABLE_RX | MAC_ENABLE_TX;
602 writel(value, ioaddr + XGMAC_CONTROL);
603
604 value = readl(ioaddr + XGMAC_DMA_CONTROL);
605 value |= DMA_CONTROL_ST | DMA_CONTROL_SR;
606 writel(value, ioaddr + XGMAC_DMA_CONTROL);
607 }
608
609 static inline void xgmac_mac_disable(void __iomem *ioaddr)
610 {
611 u32 value = readl(ioaddr + XGMAC_DMA_CONTROL);
612 value &= ~(DMA_CONTROL_ST | DMA_CONTROL_SR);
613 writel(value, ioaddr + XGMAC_DMA_CONTROL);
614
615 value = readl(ioaddr + XGMAC_CONTROL);
616 value &= ~(MAC_ENABLE_TX | MAC_ENABLE_RX);
617 writel(value, ioaddr + XGMAC_CONTROL);
618 }
619
620 static void xgmac_set_mac_addr(void __iomem *ioaddr, unsigned char *addr,
621 int num)
622 {
623 u32 data;
624
625 if (addr) {
626 data = (addr[5] << 8) | addr[4] | (num ? XGMAC_ADDR_AE : 0);
627 writel(data, ioaddr + XGMAC_ADDR_HIGH(num));
628 data = (addr[3] << 24) | (addr[2] << 16) | (addr[1] << 8) | addr[0];
629 writel(data, ioaddr + XGMAC_ADDR_LOW(num));
630 } else {
631 writel(0, ioaddr + XGMAC_ADDR_HIGH(num));
632 writel(0, ioaddr + XGMAC_ADDR_LOW(num));
633 }
634 }
635
636 static void xgmac_get_mac_addr(void __iomem *ioaddr, unsigned char *addr,
637 int num)
638 {
639 u32 hi_addr, lo_addr;
640
641 /* Read the MAC address from the hardware */
642 hi_addr = readl(ioaddr + XGMAC_ADDR_HIGH(num));
643 lo_addr = readl(ioaddr + XGMAC_ADDR_LOW(num));
644
645 /* Extract the MAC address from the high and low words */
646 addr[0] = lo_addr & 0xff;
647 addr[1] = (lo_addr >> 8) & 0xff;
648 addr[2] = (lo_addr >> 16) & 0xff;
649 addr[3] = (lo_addr >> 24) & 0xff;
650 addr[4] = hi_addr & 0xff;
651 addr[5] = (hi_addr >> 8) & 0xff;
652 }
653
654 static int xgmac_set_flow_ctrl(struct xgmac_priv *priv, int rx, int tx)
655 {
656 u32 reg;
657 unsigned int flow = 0;
658
659 priv->rx_pause = rx;
660 priv->tx_pause = tx;
661
662 if (rx || tx) {
663 if (rx)
664 flow |= XGMAC_FLOW_CTRL_RFE;
665 if (tx)
666 flow |= XGMAC_FLOW_CTRL_TFE;
667
668 flow |= XGMAC_FLOW_CTRL_PLT | XGMAC_FLOW_CTRL_UP;
669 flow |= (PAUSE_TIME << XGMAC_FLOW_CTRL_PT_SHIFT);
670
671 writel(flow, priv->base + XGMAC_FLOW_CTRL);
672
673 reg = readl(priv->base + XGMAC_OMR);
674 reg |= XGMAC_OMR_EFC;
675 writel(reg, priv->base + XGMAC_OMR);
676 } else {
677 writel(0, priv->base + XGMAC_FLOW_CTRL);
678
679 reg = readl(priv->base + XGMAC_OMR);
680 reg &= ~XGMAC_OMR_EFC;
681 writel(reg, priv->base + XGMAC_OMR);
682 }
683
684 return 0;
685 }
686
687 static void xgmac_rx_refill(struct xgmac_priv *priv)
688 {
689 struct xgmac_dma_desc *p;
690 dma_addr_t paddr;
691 int bufsz = priv->dev->mtu + ETH_HLEN + ETH_FCS_LEN;
692
693 while (dma_ring_space(priv->rx_head, priv->rx_tail, DMA_RX_RING_SZ) > 1) {
694 int entry = priv->rx_head;
695 struct sk_buff *skb;
696
697 p = priv->dma_rx + entry;
698
699 if (priv->rx_skbuff[entry] == NULL) {
700 skb = netdev_alloc_skb_ip_align(priv->dev, bufsz);
701 if (unlikely(skb == NULL))
702 break;
703
704 paddr = dma_map_single(priv->device, skb->data,
705 priv->dma_buf_sz - NET_IP_ALIGN,
706 DMA_FROM_DEVICE);
707 if (dma_mapping_error(priv->device, paddr)) {
708 dev_kfree_skb_any(skb);
709 break;
710 }
711 priv->rx_skbuff[entry] = skb;
712 desc_set_buf_addr(p, paddr, priv->dma_buf_sz);
713 }
714
715 netdev_dbg(priv->dev, "rx ring: head %d, tail %d\n",
716 priv->rx_head, priv->rx_tail);
717
718 priv->rx_head = dma_ring_incr(priv->rx_head, DMA_RX_RING_SZ);
719 desc_set_rx_owner(p);
720 }
721 }
722
723 /**
724 * init_xgmac_dma_desc_rings - init the RX/TX descriptor rings
725 * @dev: net device structure
726 * Description: this function initializes the DMA RX/TX descriptors
727 * and allocates the socket buffers.
728 */
729 static int xgmac_dma_desc_rings_init(struct net_device *dev)
730 {
731 struct xgmac_priv *priv = netdev_priv(dev);
732 unsigned int bfsize;
733
734 /* Set the Buffer size according to the MTU;
735 * The total buffer size including any IP offset must be a multiple
736 * of 8 bytes.
737 */
738 bfsize = ALIGN(dev->mtu + ETH_HLEN + ETH_FCS_LEN + NET_IP_ALIGN, 8);
739
740 netdev_dbg(priv->dev, "mtu [%d] bfsize [%d]\n", dev->mtu, bfsize);
741
742 priv->rx_skbuff = kzalloc(sizeof(struct sk_buff *) * DMA_RX_RING_SZ,
743 GFP_KERNEL);
744 if (!priv->rx_skbuff)
745 return -ENOMEM;
746
747 priv->dma_rx = dma_alloc_coherent(priv->device,
748 DMA_RX_RING_SZ *
749 sizeof(struct xgmac_dma_desc),
750 &priv->dma_rx_phy,
751 GFP_KERNEL);
752 if (!priv->dma_rx)
753 goto err_dma_rx;
754
755 priv->tx_skbuff = kzalloc(sizeof(struct sk_buff *) * DMA_TX_RING_SZ,
756 GFP_KERNEL);
757 if (!priv->tx_skbuff)
758 goto err_tx_skb;
759
760 priv->dma_tx = dma_alloc_coherent(priv->device,
761 DMA_TX_RING_SZ *
762 sizeof(struct xgmac_dma_desc),
763 &priv->dma_tx_phy,
764 GFP_KERNEL);
765 if (!priv->dma_tx)
766 goto err_dma_tx;
767
768 netdev_dbg(priv->dev, "DMA desc rings: virt addr (Rx %p, "
769 "Tx %p)\n\tDMA phy addr (Rx 0x%08x, Tx 0x%08x)\n",
770 priv->dma_rx, priv->dma_tx,
771 (unsigned int)priv->dma_rx_phy, (unsigned int)priv->dma_tx_phy);
772
773 priv->rx_tail = 0;
774 priv->rx_head = 0;
775 priv->dma_buf_sz = bfsize;
776 desc_init_rx_desc(priv->dma_rx, DMA_RX_RING_SZ, priv->dma_buf_sz);
777 xgmac_rx_refill(priv);
778
779 priv->tx_tail = 0;
780 priv->tx_head = 0;
781 desc_init_tx_desc(priv->dma_tx, DMA_TX_RING_SZ);
782
783 writel(priv->dma_tx_phy, priv->base + XGMAC_DMA_TX_BASE_ADDR);
784 writel(priv->dma_rx_phy, priv->base + XGMAC_DMA_RX_BASE_ADDR);
785
786 return 0;
787
788 err_dma_tx:
789 kfree(priv->tx_skbuff);
790 err_tx_skb:
791 dma_free_coherent(priv->device,
792 DMA_RX_RING_SZ * sizeof(struct xgmac_dma_desc),
793 priv->dma_rx, priv->dma_rx_phy);
794 err_dma_rx:
795 kfree(priv->rx_skbuff);
796 return -ENOMEM;
797 }
798
799 static void xgmac_free_rx_skbufs(struct xgmac_priv *priv)
800 {
801 int i;
802 struct xgmac_dma_desc *p;
803
804 if (!priv->rx_skbuff)
805 return;
806
807 for (i = 0; i < DMA_RX_RING_SZ; i++) {
808 struct sk_buff *skb = priv->rx_skbuff[i];
809 if (skb == NULL)
810 continue;
811
812 p = priv->dma_rx + i;
813 dma_unmap_single(priv->device, desc_get_buf_addr(p),
814 priv->dma_buf_sz - NET_IP_ALIGN, DMA_FROM_DEVICE);
815 dev_kfree_skb_any(skb);
816 priv->rx_skbuff[i] = NULL;
817 }
818 }
819
820 static void xgmac_free_tx_skbufs(struct xgmac_priv *priv)
821 {
822 int i;
823 struct xgmac_dma_desc *p;
824
825 if (!priv->tx_skbuff)
826 return;
827
828 for (i = 0; i < DMA_TX_RING_SZ; i++) {
829 if (priv->tx_skbuff[i] == NULL)
830 continue;
831
832 p = priv->dma_tx + i;
833 if (desc_get_tx_fs(p))
834 dma_unmap_single(priv->device, desc_get_buf_addr(p),
835 desc_get_buf_len(p), DMA_TO_DEVICE);
836 else
837 dma_unmap_page(priv->device, desc_get_buf_addr(p),
838 desc_get_buf_len(p), DMA_TO_DEVICE);
839
840 if (desc_get_tx_ls(p))
841 dev_kfree_skb_any(priv->tx_skbuff[i]);
842 priv->tx_skbuff[i] = NULL;
843 }
844 }
845
846 static void xgmac_free_dma_desc_rings(struct xgmac_priv *priv)
847 {
848 /* Release the DMA TX/RX socket buffers */
849 xgmac_free_rx_skbufs(priv);
850 xgmac_free_tx_skbufs(priv);
851
852 /* Free the consistent memory allocated for descriptor rings */
853 if (priv->dma_tx) {
854 dma_free_coherent(priv->device,
855 DMA_TX_RING_SZ * sizeof(struct xgmac_dma_desc),
856 priv->dma_tx, priv->dma_tx_phy);
857 priv->dma_tx = NULL;
858 }
859 if (priv->dma_rx) {
860 dma_free_coherent(priv->device,
861 DMA_RX_RING_SZ * sizeof(struct xgmac_dma_desc),
862 priv->dma_rx, priv->dma_rx_phy);
863 priv->dma_rx = NULL;
864 }
865 kfree(priv->rx_skbuff);
866 priv->rx_skbuff = NULL;
867 kfree(priv->tx_skbuff);
868 priv->tx_skbuff = NULL;
869 }
870
871 /**
872 * xgmac_tx:
873 * @priv: private driver structure
874 * Description: it reclaims resources after transmission completes.
875 */
876 static void xgmac_tx_complete(struct xgmac_priv *priv)
877 {
878 while (dma_ring_cnt(priv->tx_head, priv->tx_tail, DMA_TX_RING_SZ)) {
879 unsigned int entry = priv->tx_tail;
880 struct sk_buff *skb = priv->tx_skbuff[entry];
881 struct xgmac_dma_desc *p = priv->dma_tx + entry;
882
883 /* Check if the descriptor is owned by the DMA. */
884 if (desc_get_owner(p))
885 break;
886
887 netdev_dbg(priv->dev, "tx ring: curr %d, dirty %d\n",
888 priv->tx_head, priv->tx_tail);
889
890 if (desc_get_tx_fs(p))
891 dma_unmap_single(priv->device, desc_get_buf_addr(p),
892 desc_get_buf_len(p), DMA_TO_DEVICE);
893 else
894 dma_unmap_page(priv->device, desc_get_buf_addr(p),
895 desc_get_buf_len(p), DMA_TO_DEVICE);
896
897 /* Check tx error on the last segment */
898 if (desc_get_tx_ls(p)) {
899 desc_get_tx_status(priv, p);
900 dev_consume_skb_any(skb);
901 }
902
903 priv->tx_skbuff[entry] = NULL;
904 priv->tx_tail = dma_ring_incr(entry, DMA_TX_RING_SZ);
905 }
906
907 /* Ensure tx_tail is visible to xgmac_xmit */
908 smp_mb();
909 if (unlikely(netif_queue_stopped(priv->dev) &&
910 (tx_dma_ring_space(priv) > MAX_SKB_FRAGS)))
911 netif_wake_queue(priv->dev);
912 }
913
914 static void xgmac_tx_timeout_work(struct work_struct *work)
915 {
916 u32 reg, value;
917 struct xgmac_priv *priv =
918 container_of(work, struct xgmac_priv, tx_timeout_work);
919
920 napi_disable(&priv->napi);
921
922 writel(0, priv->base + XGMAC_DMA_INTR_ENA);
923
924 netif_tx_lock(priv->dev);
925
926 reg = readl(priv->base + XGMAC_DMA_CONTROL);
927 writel(reg & ~DMA_CONTROL_ST, priv->base + XGMAC_DMA_CONTROL);
928 do {
929 value = readl(priv->base + XGMAC_DMA_STATUS) & 0x700000;
930 } while (value && (value != 0x600000));
931
932 xgmac_free_tx_skbufs(priv);
933 desc_init_tx_desc(priv->dma_tx, DMA_TX_RING_SZ);
934 priv->tx_tail = 0;
935 priv->tx_head = 0;
936 writel(priv->dma_tx_phy, priv->base + XGMAC_DMA_TX_BASE_ADDR);
937 writel(reg | DMA_CONTROL_ST, priv->base + XGMAC_DMA_CONTROL);
938
939 writel(DMA_STATUS_TU | DMA_STATUS_TPS | DMA_STATUS_NIS | DMA_STATUS_AIS,
940 priv->base + XGMAC_DMA_STATUS);
941
942 netif_tx_unlock(priv->dev);
943 netif_wake_queue(priv->dev);
944
945 napi_enable(&priv->napi);
946
947 /* Enable interrupts */
948 writel(DMA_INTR_DEFAULT_MASK, priv->base + XGMAC_DMA_STATUS);
949 writel(DMA_INTR_DEFAULT_MASK, priv->base + XGMAC_DMA_INTR_ENA);
950 }
951
952 static int xgmac_hw_init(struct net_device *dev)
953 {
954 u32 value, ctrl;
955 int limit;
956 struct xgmac_priv *priv = netdev_priv(dev);
957 void __iomem *ioaddr = priv->base;
958
959 /* Save the ctrl register value */
960 ctrl = readl(ioaddr + XGMAC_CONTROL) & XGMAC_CONTROL_SPD_MASK;
961
962 /* SW reset */
963 value = DMA_BUS_MODE_SFT_RESET;
964 writel(value, ioaddr + XGMAC_DMA_BUS_MODE);
965 limit = 15000;
966 while (limit-- &&
967 (readl(ioaddr + XGMAC_DMA_BUS_MODE) & DMA_BUS_MODE_SFT_RESET))
968 cpu_relax();
969 if (limit < 0)
970 return -EBUSY;
971
972 value = (0x10 << DMA_BUS_MODE_PBL_SHIFT) |
973 (0x10 << DMA_BUS_MODE_RPBL_SHIFT) |
974 DMA_BUS_MODE_FB | DMA_BUS_MODE_ATDS | DMA_BUS_MODE_AAL;
975 writel(value, ioaddr + XGMAC_DMA_BUS_MODE);
976
977 writel(0, ioaddr + XGMAC_DMA_INTR_ENA);
978
979 /* Mask power mgt interrupt */
980 writel(XGMAC_INT_STAT_PMTIM, ioaddr + XGMAC_INT_STAT);
981
982 /* XGMAC requires AXI bus init. This is a 'magic number' for now */
983 writel(0x0077000E, ioaddr + XGMAC_DMA_AXI_BUS);
984
985 ctrl |= XGMAC_CONTROL_DDIC | XGMAC_CONTROL_JE | XGMAC_CONTROL_ACS |
986 XGMAC_CONTROL_CAR;
987 if (dev->features & NETIF_F_RXCSUM)
988 ctrl |= XGMAC_CONTROL_IPC;
989 writel(ctrl, ioaddr + XGMAC_CONTROL);
990
991 writel(DMA_CONTROL_OSF, ioaddr + XGMAC_DMA_CONTROL);
992
993 /* Set the HW DMA mode and the COE */
994 writel(XGMAC_OMR_TSF | XGMAC_OMR_RFD | XGMAC_OMR_RFA |
995 XGMAC_OMR_RTC_256,
996 ioaddr + XGMAC_OMR);
997
998 /* Reset the MMC counters */
999 writel(1, ioaddr + XGMAC_MMC_CTRL);
1000 return 0;
1001 }
1002
1003 /**
1004 * xgmac_open - open entry point of the driver
1005 * @dev : pointer to the device structure.
1006 * Description:
1007 * This function is the open entry point of the driver.
1008 * Return value:
1009 * 0 on success and an appropriate (-)ve integer as defined in errno.h
1010 * file on failure.
1011 */
1012 static int xgmac_open(struct net_device *dev)
1013 {
1014 int ret;
1015 struct xgmac_priv *priv = netdev_priv(dev);
1016 void __iomem *ioaddr = priv->base;
1017
1018 /* Check that the MAC address is valid. If its not, refuse
1019 * to bring the device up. The user must specify an
1020 * address using the following linux command:
1021 * ifconfig eth0 hw ether xx:xx:xx:xx:xx:xx */
1022 if (!is_valid_ether_addr(dev->dev_addr)) {
1023 eth_hw_addr_random(dev);
1024 netdev_dbg(priv->dev, "generated random MAC address %pM\n",
1025 dev->dev_addr);
1026 }
1027
1028 memset(&priv->xstats, 0, sizeof(struct xgmac_extra_stats));
1029
1030 /* Initialize the XGMAC and descriptors */
1031 xgmac_hw_init(dev);
1032 xgmac_set_mac_addr(ioaddr, dev->dev_addr, 0);
1033 xgmac_set_flow_ctrl(priv, priv->rx_pause, priv->tx_pause);
1034
1035 ret = xgmac_dma_desc_rings_init(dev);
1036 if (ret < 0)
1037 return ret;
1038
1039 /* Enable the MAC Rx/Tx */
1040 xgmac_mac_enable(ioaddr);
1041
1042 napi_enable(&priv->napi);
1043 netif_start_queue(dev);
1044
1045 /* Enable interrupts */
1046 writel(DMA_INTR_DEFAULT_MASK, ioaddr + XGMAC_DMA_STATUS);
1047 writel(DMA_INTR_DEFAULT_MASK, ioaddr + XGMAC_DMA_INTR_ENA);
1048
1049 return 0;
1050 }
1051
1052 /**
1053 * xgmac_release - close entry point of the driver
1054 * @dev : device pointer.
1055 * Description:
1056 * This is the stop entry point of the driver.
1057 */
1058 static int xgmac_stop(struct net_device *dev)
1059 {
1060 struct xgmac_priv *priv = netdev_priv(dev);
1061
1062 if (readl(priv->base + XGMAC_DMA_INTR_ENA))
1063 napi_disable(&priv->napi);
1064
1065 writel(0, priv->base + XGMAC_DMA_INTR_ENA);
1066
1067 netif_tx_disable(dev);
1068
1069 /* Disable the MAC core */
1070 xgmac_mac_disable(priv->base);
1071
1072 /* Release and free the Rx/Tx resources */
1073 xgmac_free_dma_desc_rings(priv);
1074
1075 return 0;
1076 }
1077
1078 /**
1079 * xgmac_xmit:
1080 * @skb : the socket buffer
1081 * @dev : device pointer
1082 * Description : Tx entry point of the driver.
1083 */
1084 static netdev_tx_t xgmac_xmit(struct sk_buff *skb, struct net_device *dev)
1085 {
1086 struct xgmac_priv *priv = netdev_priv(dev);
1087 unsigned int entry;
1088 int i;
1089 u32 irq_flag;
1090 int nfrags = skb_shinfo(skb)->nr_frags;
1091 struct xgmac_dma_desc *desc, *first;
1092 unsigned int desc_flags;
1093 unsigned int len;
1094 dma_addr_t paddr;
1095
1096 priv->tx_irq_cnt = (priv->tx_irq_cnt + 1) & (DMA_TX_RING_SZ/4 - 1);
1097 irq_flag = priv->tx_irq_cnt ? 0 : TXDESC_INTERRUPT;
1098
1099 desc_flags = (skb->ip_summed == CHECKSUM_PARTIAL) ?
1100 TXDESC_CSUM_ALL : 0;
1101 entry = priv->tx_head;
1102 desc = priv->dma_tx + entry;
1103 first = desc;
1104
1105 len = skb_headlen(skb);
1106 paddr = dma_map_single(priv->device, skb->data, len, DMA_TO_DEVICE);
1107 if (dma_mapping_error(priv->device, paddr)) {
1108 dev_kfree_skb_any(skb);
1109 return NETDEV_TX_OK;
1110 }
1111 priv->tx_skbuff[entry] = skb;
1112 desc_set_buf_addr_and_size(desc, paddr, len);
1113
1114 for (i = 0; i < nfrags; i++) {
1115 skb_frag_t *frag = &skb_shinfo(skb)->frags[i];
1116
1117 len = frag->size;
1118
1119 paddr = skb_frag_dma_map(priv->device, frag, 0, len,
1120 DMA_TO_DEVICE);
1121 if (dma_mapping_error(priv->device, paddr))
1122 goto dma_err;
1123
1124 entry = dma_ring_incr(entry, DMA_TX_RING_SZ);
1125 desc = priv->dma_tx + entry;
1126 priv->tx_skbuff[entry] = skb;
1127
1128 desc_set_buf_addr_and_size(desc, paddr, len);
1129 if (i < (nfrags - 1))
1130 desc_set_tx_owner(desc, desc_flags);
1131 }
1132
1133 /* Interrupt on completition only for the latest segment */
1134 if (desc != first)
1135 desc_set_tx_owner(desc, desc_flags |
1136 TXDESC_LAST_SEG | irq_flag);
1137 else
1138 desc_flags |= TXDESC_LAST_SEG | irq_flag;
1139
1140 /* Set owner on first desc last to avoid race condition */
1141 wmb();
1142 desc_set_tx_owner(first, desc_flags | TXDESC_FIRST_SEG);
1143
1144 writel(1, priv->base + XGMAC_DMA_TX_POLL);
1145
1146 priv->tx_head = dma_ring_incr(entry, DMA_TX_RING_SZ);
1147
1148 /* Ensure tx_head update is visible to tx completion */
1149 smp_mb();
1150 if (unlikely(tx_dma_ring_space(priv) <= MAX_SKB_FRAGS)) {
1151 netif_stop_queue(dev);
1152 /* Ensure netif_stop_queue is visible to tx completion */
1153 smp_mb();
1154 if (tx_dma_ring_space(priv) > MAX_SKB_FRAGS)
1155 netif_start_queue(dev);
1156 }
1157 return NETDEV_TX_OK;
1158
1159 dma_err:
1160 entry = priv->tx_head;
1161 for ( ; i > 0; i--) {
1162 entry = dma_ring_incr(entry, DMA_TX_RING_SZ);
1163 desc = priv->dma_tx + entry;
1164 priv->tx_skbuff[entry] = NULL;
1165 dma_unmap_page(priv->device, desc_get_buf_addr(desc),
1166 desc_get_buf_len(desc), DMA_TO_DEVICE);
1167 desc_clear_tx_owner(desc);
1168 }
1169 desc = first;
1170 dma_unmap_single(priv->device, desc_get_buf_addr(desc),
1171 desc_get_buf_len(desc), DMA_TO_DEVICE);
1172 dev_kfree_skb_any(skb);
1173 return NETDEV_TX_OK;
1174 }
1175
1176 static int xgmac_rx(struct xgmac_priv *priv, int limit)
1177 {
1178 unsigned int entry;
1179 unsigned int count = 0;
1180 struct xgmac_dma_desc *p;
1181
1182 while (count < limit) {
1183 int ip_checksum;
1184 struct sk_buff *skb;
1185 int frame_len;
1186
1187 if (!dma_ring_cnt(priv->rx_head, priv->rx_tail, DMA_RX_RING_SZ))
1188 break;
1189
1190 entry = priv->rx_tail;
1191 p = priv->dma_rx + entry;
1192 if (desc_get_owner(p))
1193 break;
1194
1195 count++;
1196 priv->rx_tail = dma_ring_incr(priv->rx_tail, DMA_RX_RING_SZ);
1197
1198 /* read the status of the incoming frame */
1199 ip_checksum = desc_get_rx_status(priv, p);
1200 if (ip_checksum < 0)
1201 continue;
1202
1203 skb = priv->rx_skbuff[entry];
1204 if (unlikely(!skb)) {
1205 netdev_err(priv->dev, "Inconsistent Rx descriptor chain\n");
1206 break;
1207 }
1208 priv->rx_skbuff[entry] = NULL;
1209
1210 frame_len = desc_get_rx_frame_len(p);
1211 netdev_dbg(priv->dev, "RX frame size %d, COE status: %d\n",
1212 frame_len, ip_checksum);
1213
1214 skb_put(skb, frame_len);
1215 dma_unmap_single(priv->device, desc_get_buf_addr(p),
1216 priv->dma_buf_sz - NET_IP_ALIGN, DMA_FROM_DEVICE);
1217
1218 skb->protocol = eth_type_trans(skb, priv->dev);
1219 skb->ip_summed = ip_checksum;
1220 if (ip_checksum == CHECKSUM_NONE)
1221 netif_receive_skb(skb);
1222 else
1223 napi_gro_receive(&priv->napi, skb);
1224 }
1225
1226 xgmac_rx_refill(priv);
1227
1228 return count;
1229 }
1230
1231 /**
1232 * xgmac_poll - xgmac poll method (NAPI)
1233 * @napi : pointer to the napi structure.
1234 * @budget : maximum number of packets that the current CPU can receive from
1235 * all interfaces.
1236 * Description :
1237 * This function implements the the reception process.
1238 * Also it runs the TX completion thread
1239 */
1240 static int xgmac_poll(struct napi_struct *napi, int budget)
1241 {
1242 struct xgmac_priv *priv = container_of(napi,
1243 struct xgmac_priv, napi);
1244 int work_done = 0;
1245
1246 xgmac_tx_complete(priv);
1247 work_done = xgmac_rx(priv, budget);
1248
1249 if (work_done < budget) {
1250 napi_complete(napi);
1251 __raw_writel(DMA_INTR_DEFAULT_MASK, priv->base + XGMAC_DMA_INTR_ENA);
1252 }
1253 return work_done;
1254 }
1255
1256 /**
1257 * xgmac_tx_timeout
1258 * @dev : Pointer to net device structure
1259 * Description: this function is called when a packet transmission fails to
1260 * complete within a reasonable tmrate. The driver will mark the error in the
1261 * netdev structure and arrange for the device to be reset to a sane state
1262 * in order to transmit a new packet.
1263 */
1264 static void xgmac_tx_timeout(struct net_device *dev)
1265 {
1266 struct xgmac_priv *priv = netdev_priv(dev);
1267 schedule_work(&priv->tx_timeout_work);
1268 }
1269
1270 /**
1271 * xgmac_set_rx_mode - entry point for multicast addressing
1272 * @dev : pointer to the device structure
1273 * Description:
1274 * This function is a driver entry point which gets called by the kernel
1275 * whenever multicast addresses must be enabled/disabled.
1276 * Return value:
1277 * void.
1278 */
1279 static void xgmac_set_rx_mode(struct net_device *dev)
1280 {
1281 int i;
1282 struct xgmac_priv *priv = netdev_priv(dev);
1283 void __iomem *ioaddr = priv->base;
1284 unsigned int value = 0;
1285 u32 hash_filter[XGMAC_NUM_HASH];
1286 int reg = 1;
1287 struct netdev_hw_addr *ha;
1288 bool use_hash = false;
1289
1290 netdev_dbg(priv->dev, "# mcasts %d, # unicast %d\n",
1291 netdev_mc_count(dev), netdev_uc_count(dev));
1292
1293 if (dev->flags & IFF_PROMISC)
1294 value |= XGMAC_FRAME_FILTER_PR;
1295
1296 memset(hash_filter, 0, sizeof(hash_filter));
1297
1298 if (netdev_uc_count(dev) > priv->max_macs) {
1299 use_hash = true;
1300 value |= XGMAC_FRAME_FILTER_HUC | XGMAC_FRAME_FILTER_HPF;
1301 }
1302 netdev_for_each_uc_addr(ha, dev) {
1303 if (use_hash) {
1304 u32 bit_nr = ~ether_crc(ETH_ALEN, ha->addr) >> 23;
1305
1306 /* The most significant 4 bits determine the register to
1307 * use (H/L) while the other 5 bits determine the bit
1308 * within the register. */
1309 hash_filter[bit_nr >> 5] |= 1 << (bit_nr & 31);
1310 } else {
1311 xgmac_set_mac_addr(ioaddr, ha->addr, reg);
1312 reg++;
1313 }
1314 }
1315
1316 if (dev->flags & IFF_ALLMULTI) {
1317 value |= XGMAC_FRAME_FILTER_PM;
1318 goto out;
1319 }
1320
1321 if ((netdev_mc_count(dev) + reg - 1) > priv->max_macs) {
1322 use_hash = true;
1323 value |= XGMAC_FRAME_FILTER_HMC | XGMAC_FRAME_FILTER_HPF;
1324 } else {
1325 use_hash = false;
1326 }
1327 netdev_for_each_mc_addr(ha, dev) {
1328 if (use_hash) {
1329 u32 bit_nr = ~ether_crc(ETH_ALEN, ha->addr) >> 23;
1330
1331 /* The most significant 4 bits determine the register to
1332 * use (H/L) while the other 5 bits determine the bit
1333 * within the register. */
1334 hash_filter[bit_nr >> 5] |= 1 << (bit_nr & 31);
1335 } else {
1336 xgmac_set_mac_addr(ioaddr, ha->addr, reg);
1337 reg++;
1338 }
1339 }
1340
1341 out:
1342 for (i = reg; i <= priv->max_macs; i++)
1343 xgmac_set_mac_addr(ioaddr, NULL, i);
1344 for (i = 0; i < XGMAC_NUM_HASH; i++)
1345 writel(hash_filter[i], ioaddr + XGMAC_HASH(i));
1346
1347 writel(value, ioaddr + XGMAC_FRAME_FILTER);
1348 }
1349
1350 /**
1351 * xgmac_change_mtu - entry point to change MTU size for the device.
1352 * @dev : device pointer.
1353 * @new_mtu : the new MTU size for the device.
1354 * Description: the Maximum Transfer Unit (MTU) is used by the network layer
1355 * to drive packet transmission. Ethernet has an MTU of 1500 octets
1356 * (ETH_DATA_LEN). This value can be changed with ifconfig.
1357 * Return value:
1358 * 0 on success and an appropriate (-)ve integer as defined in errno.h
1359 * file on failure.
1360 */
1361 static int xgmac_change_mtu(struct net_device *dev, int new_mtu)
1362 {
1363 struct xgmac_priv *priv = netdev_priv(dev);
1364 int old_mtu;
1365
1366 if ((new_mtu < 46) || (new_mtu > MAX_MTU)) {
1367 netdev_err(priv->dev, "invalid MTU, max MTU is: %d\n", MAX_MTU);
1368 return -EINVAL;
1369 }
1370
1371 old_mtu = dev->mtu;
1372
1373 /* return early if the buffer sizes will not change */
1374 if (old_mtu == new_mtu)
1375 return 0;
1376
1377 /* Stop everything, get ready to change the MTU */
1378 if (!netif_running(dev))
1379 return 0;
1380
1381 /* Bring interface down, change mtu and bring interface back up */
1382 xgmac_stop(dev);
1383 dev->mtu = new_mtu;
1384 return xgmac_open(dev);
1385 }
1386
1387 static irqreturn_t xgmac_pmt_interrupt(int irq, void *dev_id)
1388 {
1389 u32 intr_status;
1390 struct net_device *dev = (struct net_device *)dev_id;
1391 struct xgmac_priv *priv = netdev_priv(dev);
1392 void __iomem *ioaddr = priv->base;
1393
1394 intr_status = __raw_readl(ioaddr + XGMAC_INT_STAT);
1395 if (intr_status & XGMAC_INT_STAT_PMT) {
1396 netdev_dbg(priv->dev, "received Magic frame\n");
1397 /* clear the PMT bits 5 and 6 by reading the PMT */
1398 readl(ioaddr + XGMAC_PMT);
1399 }
1400 return IRQ_HANDLED;
1401 }
1402
1403 static irqreturn_t xgmac_interrupt(int irq, void *dev_id)
1404 {
1405 u32 intr_status;
1406 struct net_device *dev = (struct net_device *)dev_id;
1407 struct xgmac_priv *priv = netdev_priv(dev);
1408 struct xgmac_extra_stats *x = &priv->xstats;
1409
1410 /* read the status register (CSR5) */
1411 intr_status = __raw_readl(priv->base + XGMAC_DMA_STATUS);
1412 intr_status &= __raw_readl(priv->base + XGMAC_DMA_INTR_ENA);
1413 __raw_writel(intr_status, priv->base + XGMAC_DMA_STATUS);
1414
1415 /* It displays the DMA process states (CSR5 register) */
1416 /* ABNORMAL interrupts */
1417 if (unlikely(intr_status & DMA_STATUS_AIS)) {
1418 if (intr_status & DMA_STATUS_TJT) {
1419 netdev_err(priv->dev, "transmit jabber\n");
1420 x->tx_jabber++;
1421 }
1422 if (intr_status & DMA_STATUS_RU)
1423 x->rx_buf_unav++;
1424 if (intr_status & DMA_STATUS_RPS) {
1425 netdev_err(priv->dev, "receive process stopped\n");
1426 x->rx_process_stopped++;
1427 }
1428 if (intr_status & DMA_STATUS_ETI) {
1429 netdev_err(priv->dev, "transmit early interrupt\n");
1430 x->tx_early++;
1431 }
1432 if (intr_status & DMA_STATUS_TPS) {
1433 netdev_err(priv->dev, "transmit process stopped\n");
1434 x->tx_process_stopped++;
1435 schedule_work(&priv->tx_timeout_work);
1436 }
1437 if (intr_status & DMA_STATUS_FBI) {
1438 netdev_err(priv->dev, "fatal bus error\n");
1439 x->fatal_bus_error++;
1440 }
1441 }
1442
1443 /* TX/RX NORMAL interrupts */
1444 if (intr_status & (DMA_STATUS_RI | DMA_STATUS_TU | DMA_STATUS_TI)) {
1445 __raw_writel(DMA_INTR_ABNORMAL, priv->base + XGMAC_DMA_INTR_ENA);
1446 napi_schedule(&priv->napi);
1447 }
1448
1449 return IRQ_HANDLED;
1450 }
1451
1452 #ifdef CONFIG_NET_POLL_CONTROLLER
1453 /* Polling receive - used by NETCONSOLE and other diagnostic tools
1454 * to allow network I/O with interrupts disabled. */
1455 static void xgmac_poll_controller(struct net_device *dev)
1456 {
1457 disable_irq(dev->irq);
1458 xgmac_interrupt(dev->irq, dev);
1459 enable_irq(dev->irq);
1460 }
1461 #endif
1462
1463 static struct rtnl_link_stats64 *
1464 xgmac_get_stats64(struct net_device *dev,
1465 struct rtnl_link_stats64 *storage)
1466 {
1467 struct xgmac_priv *priv = netdev_priv(dev);
1468 void __iomem *base = priv->base;
1469 u32 count;
1470
1471 spin_lock_bh(&priv->stats_lock);
1472 writel(XGMAC_MMC_CTRL_CNT_FRZ, base + XGMAC_MMC_CTRL);
1473
1474 storage->rx_bytes = readl(base + XGMAC_MMC_RXOCTET_G_LO);
1475 storage->rx_bytes |= (u64)(readl(base + XGMAC_MMC_RXOCTET_G_HI)) << 32;
1476
1477 storage->rx_packets = readl(base + XGMAC_MMC_RXFRAME_GB_LO);
1478 storage->multicast = readl(base + XGMAC_MMC_RXMCFRAME_G);
1479 storage->rx_crc_errors = readl(base + XGMAC_MMC_RXCRCERR);
1480 storage->rx_length_errors = readl(base + XGMAC_MMC_RXLENGTHERR);
1481 storage->rx_missed_errors = readl(base + XGMAC_MMC_RXOVERFLOW);
1482
1483 storage->tx_bytes = readl(base + XGMAC_MMC_TXOCTET_G_LO);
1484 storage->tx_bytes |= (u64)(readl(base + XGMAC_MMC_TXOCTET_G_HI)) << 32;
1485
1486 count = readl(base + XGMAC_MMC_TXFRAME_GB_LO);
1487 storage->tx_errors = count - readl(base + XGMAC_MMC_TXFRAME_G_LO);
1488 storage->tx_packets = count;
1489 storage->tx_fifo_errors = readl(base + XGMAC_MMC_TXUNDERFLOW);
1490
1491 writel(0, base + XGMAC_MMC_CTRL);
1492 spin_unlock_bh(&priv->stats_lock);
1493 return storage;
1494 }
1495
1496 static int xgmac_set_mac_address(struct net_device *dev, void *p)
1497 {
1498 struct xgmac_priv *priv = netdev_priv(dev);
1499 void __iomem *ioaddr = priv->base;
1500 struct sockaddr *addr = p;
1501
1502 if (!is_valid_ether_addr(addr->sa_data))
1503 return -EADDRNOTAVAIL;
1504
1505 memcpy(dev->dev_addr, addr->sa_data, dev->addr_len);
1506
1507 xgmac_set_mac_addr(ioaddr, dev->dev_addr, 0);
1508
1509 return 0;
1510 }
1511
1512 static int xgmac_set_features(struct net_device *dev, netdev_features_t features)
1513 {
1514 u32 ctrl;
1515 struct xgmac_priv *priv = netdev_priv(dev);
1516 void __iomem *ioaddr = priv->base;
1517 netdev_features_t changed = dev->features ^ features;
1518
1519 if (!(changed & NETIF_F_RXCSUM))
1520 return 0;
1521
1522 ctrl = readl(ioaddr + XGMAC_CONTROL);
1523 if (features & NETIF_F_RXCSUM)
1524 ctrl |= XGMAC_CONTROL_IPC;
1525 else
1526 ctrl &= ~XGMAC_CONTROL_IPC;
1527 writel(ctrl, ioaddr + XGMAC_CONTROL);
1528
1529 return 0;
1530 }
1531
1532 static const struct net_device_ops xgmac_netdev_ops = {
1533 .ndo_open = xgmac_open,
1534 .ndo_start_xmit = xgmac_xmit,
1535 .ndo_stop = xgmac_stop,
1536 .ndo_change_mtu = xgmac_change_mtu,
1537 .ndo_set_rx_mode = xgmac_set_rx_mode,
1538 .ndo_tx_timeout = xgmac_tx_timeout,
1539 .ndo_get_stats64 = xgmac_get_stats64,
1540 #ifdef CONFIG_NET_POLL_CONTROLLER
1541 .ndo_poll_controller = xgmac_poll_controller,
1542 #endif
1543 .ndo_set_mac_address = xgmac_set_mac_address,
1544 .ndo_set_features = xgmac_set_features,
1545 };
1546
1547 static int xgmac_ethtool_getsettings(struct net_device *dev,
1548 struct ethtool_cmd *cmd)
1549 {
1550 cmd->autoneg = 0;
1551 cmd->duplex = DUPLEX_FULL;
1552 ethtool_cmd_speed_set(cmd, 10000);
1553 cmd->supported = 0;
1554 cmd->advertising = 0;
1555 cmd->transceiver = XCVR_INTERNAL;
1556 return 0;
1557 }
1558
1559 static void xgmac_get_pauseparam(struct net_device *netdev,
1560 struct ethtool_pauseparam *pause)
1561 {
1562 struct xgmac_priv *priv = netdev_priv(netdev);
1563
1564 pause->rx_pause = priv->rx_pause;
1565 pause->tx_pause = priv->tx_pause;
1566 }
1567
1568 static int xgmac_set_pauseparam(struct net_device *netdev,
1569 struct ethtool_pauseparam *pause)
1570 {
1571 struct xgmac_priv *priv = netdev_priv(netdev);
1572
1573 if (pause->autoneg)
1574 return -EINVAL;
1575
1576 return xgmac_set_flow_ctrl(priv, pause->rx_pause, pause->tx_pause);
1577 }
1578
1579 struct xgmac_stats {
1580 char stat_string[ETH_GSTRING_LEN];
1581 int stat_offset;
1582 bool is_reg;
1583 };
1584
1585 #define XGMAC_STAT(m) \
1586 { #m, offsetof(struct xgmac_priv, xstats.m), false }
1587 #define XGMAC_HW_STAT(m, reg_offset) \
1588 { #m, reg_offset, true }
1589
1590 static const struct xgmac_stats xgmac_gstrings_stats[] = {
1591 XGMAC_STAT(tx_frame_flushed),
1592 XGMAC_STAT(tx_payload_error),
1593 XGMAC_STAT(tx_ip_header_error),
1594 XGMAC_STAT(tx_local_fault),
1595 XGMAC_STAT(tx_remote_fault),
1596 XGMAC_STAT(tx_early),
1597 XGMAC_STAT(tx_process_stopped),
1598 XGMAC_STAT(tx_jabber),
1599 XGMAC_STAT(rx_buf_unav),
1600 XGMAC_STAT(rx_process_stopped),
1601 XGMAC_STAT(rx_payload_error),
1602 XGMAC_STAT(rx_ip_header_error),
1603 XGMAC_STAT(rx_da_filter_fail),
1604 XGMAC_STAT(fatal_bus_error),
1605 XGMAC_HW_STAT(rx_watchdog, XGMAC_MMC_RXWATCHDOG),
1606 XGMAC_HW_STAT(tx_vlan, XGMAC_MMC_TXVLANFRAME),
1607 XGMAC_HW_STAT(rx_vlan, XGMAC_MMC_RXVLANFRAME),
1608 XGMAC_HW_STAT(tx_pause, XGMAC_MMC_TXPAUSEFRAME),
1609 XGMAC_HW_STAT(rx_pause, XGMAC_MMC_RXPAUSEFRAME),
1610 };
1611 #define XGMAC_STATS_LEN ARRAY_SIZE(xgmac_gstrings_stats)
1612
1613 static void xgmac_get_ethtool_stats(struct net_device *dev,
1614 struct ethtool_stats *dummy,
1615 u64 *data)
1616 {
1617 struct xgmac_priv *priv = netdev_priv(dev);
1618 void *p = priv;
1619 int i;
1620
1621 for (i = 0; i < XGMAC_STATS_LEN; i++) {
1622 if (xgmac_gstrings_stats[i].is_reg)
1623 *data++ = readl(priv->base +
1624 xgmac_gstrings_stats[i].stat_offset);
1625 else
1626 *data++ = *(u32 *)(p +
1627 xgmac_gstrings_stats[i].stat_offset);
1628 }
1629 }
1630
1631 static int xgmac_get_sset_count(struct net_device *netdev, int sset)
1632 {
1633 switch (sset) {
1634 case ETH_SS_STATS:
1635 return XGMAC_STATS_LEN;
1636 default:
1637 return -EINVAL;
1638 }
1639 }
1640
1641 static void xgmac_get_strings(struct net_device *dev, u32 stringset,
1642 u8 *data)
1643 {
1644 int i;
1645 u8 *p = data;
1646
1647 switch (stringset) {
1648 case ETH_SS_STATS:
1649 for (i = 0; i < XGMAC_STATS_LEN; i++) {
1650 memcpy(p, xgmac_gstrings_stats[i].stat_string,
1651 ETH_GSTRING_LEN);
1652 p += ETH_GSTRING_LEN;
1653 }
1654 break;
1655 default:
1656 WARN_ON(1);
1657 break;
1658 }
1659 }
1660
1661 static void xgmac_get_wol(struct net_device *dev,
1662 struct ethtool_wolinfo *wol)
1663 {
1664 struct xgmac_priv *priv = netdev_priv(dev);
1665
1666 if (device_can_wakeup(priv->device)) {
1667 wol->supported = WAKE_MAGIC | WAKE_UCAST;
1668 wol->wolopts = priv->wolopts;
1669 }
1670 }
1671
1672 static int xgmac_set_wol(struct net_device *dev,
1673 struct ethtool_wolinfo *wol)
1674 {
1675 struct xgmac_priv *priv = netdev_priv(dev);
1676 u32 support = WAKE_MAGIC | WAKE_UCAST;
1677
1678 if (!device_can_wakeup(priv->device))
1679 return -ENOTSUPP;
1680
1681 if (wol->wolopts & ~support)
1682 return -EINVAL;
1683
1684 priv->wolopts = wol->wolopts;
1685
1686 if (wol->wolopts) {
1687 device_set_wakeup_enable(priv->device, 1);
1688 enable_irq_wake(dev->irq);
1689 } else {
1690 device_set_wakeup_enable(priv->device, 0);
1691 disable_irq_wake(dev->irq);
1692 }
1693
1694 return 0;
1695 }
1696
1697 static const struct ethtool_ops xgmac_ethtool_ops = {
1698 .get_settings = xgmac_ethtool_getsettings,
1699 .get_link = ethtool_op_get_link,
1700 .get_pauseparam = xgmac_get_pauseparam,
1701 .set_pauseparam = xgmac_set_pauseparam,
1702 .get_ethtool_stats = xgmac_get_ethtool_stats,
1703 .get_strings = xgmac_get_strings,
1704 .get_wol = xgmac_get_wol,
1705 .set_wol = xgmac_set_wol,
1706 .get_sset_count = xgmac_get_sset_count,
1707 };
1708
1709 /**
1710 * xgmac_probe
1711 * @pdev: platform device pointer
1712 * Description: the driver is initialized through platform_device.
1713 */
1714 static int xgmac_probe(struct platform_device *pdev)
1715 {
1716 int ret = 0;
1717 struct resource *res;
1718 struct net_device *ndev = NULL;
1719 struct xgmac_priv *priv = NULL;
1720 u32 uid;
1721
1722 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
1723 if (!res)
1724 return -ENODEV;
1725
1726 if (!request_mem_region(res->start, resource_size(res), pdev->name))
1727 return -EBUSY;
1728
1729 ndev = alloc_etherdev(sizeof(struct xgmac_priv));
1730 if (!ndev) {
1731 ret = -ENOMEM;
1732 goto err_alloc;
1733 }
1734
1735 SET_NETDEV_DEV(ndev, &pdev->dev);
1736 priv = netdev_priv(ndev);
1737 platform_set_drvdata(pdev, ndev);
1738 ndev->netdev_ops = &xgmac_netdev_ops;
1739 ndev->ethtool_ops = &xgmac_ethtool_ops;
1740 spin_lock_init(&priv->stats_lock);
1741 INIT_WORK(&priv->tx_timeout_work, xgmac_tx_timeout_work);
1742
1743 priv->device = &pdev->dev;
1744 priv->dev = ndev;
1745 priv->rx_pause = 1;
1746 priv->tx_pause = 1;
1747
1748 priv->base = ioremap(res->start, resource_size(res));
1749 if (!priv->base) {
1750 netdev_err(ndev, "ioremap failed\n");
1751 ret = -ENOMEM;
1752 goto err_io;
1753 }
1754
1755 uid = readl(priv->base + XGMAC_VERSION);
1756 netdev_info(ndev, "h/w version is 0x%x\n", uid);
1757
1758 /* Figure out how many valid mac address filter registers we have */
1759 writel(1, priv->base + XGMAC_ADDR_HIGH(31));
1760 if (readl(priv->base + XGMAC_ADDR_HIGH(31)) == 1)
1761 priv->max_macs = 31;
1762 else
1763 priv->max_macs = 7;
1764
1765 writel(0, priv->base + XGMAC_DMA_INTR_ENA);
1766 ndev->irq = platform_get_irq(pdev, 0);
1767 if (ndev->irq == -ENXIO) {
1768 netdev_err(ndev, "No irq resource\n");
1769 ret = ndev->irq;
1770 goto err_irq;
1771 }
1772
1773 ret = request_irq(ndev->irq, xgmac_interrupt, 0,
1774 dev_name(&pdev->dev), ndev);
1775 if (ret < 0) {
1776 netdev_err(ndev, "Could not request irq %d - ret %d)\n",
1777 ndev->irq, ret);
1778 goto err_irq;
1779 }
1780
1781 priv->pmt_irq = platform_get_irq(pdev, 1);
1782 if (priv->pmt_irq == -ENXIO) {
1783 netdev_err(ndev, "No pmt irq resource\n");
1784 ret = priv->pmt_irq;
1785 goto err_pmt_irq;
1786 }
1787
1788 ret = request_irq(priv->pmt_irq, xgmac_pmt_interrupt, 0,
1789 dev_name(&pdev->dev), ndev);
1790 if (ret < 0) {
1791 netdev_err(ndev, "Could not request irq %d - ret %d)\n",
1792 priv->pmt_irq, ret);
1793 goto err_pmt_irq;
1794 }
1795
1796 device_set_wakeup_capable(&pdev->dev, 1);
1797 if (device_can_wakeup(priv->device))
1798 priv->wolopts = WAKE_MAGIC; /* Magic Frame as default */
1799
1800 ndev->hw_features = NETIF_F_SG | NETIF_F_HIGHDMA;
1801 if (readl(priv->base + XGMAC_DMA_HW_FEATURE) & DMA_HW_FEAT_TXCOESEL)
1802 ndev->hw_features |= NETIF_F_IP_CSUM | NETIF_F_IPV6_CSUM |
1803 NETIF_F_RXCSUM;
1804 ndev->features |= ndev->hw_features;
1805 ndev->priv_flags |= IFF_UNICAST_FLT;
1806
1807 /* Get the MAC address */
1808 xgmac_get_mac_addr(priv->base, ndev->dev_addr, 0);
1809 if (!is_valid_ether_addr(ndev->dev_addr))
1810 netdev_warn(ndev, "MAC address %pM not valid",
1811 ndev->dev_addr);
1812
1813 netif_napi_add(ndev, &priv->napi, xgmac_poll, 64);
1814 ret = register_netdev(ndev);
1815 if (ret)
1816 goto err_reg;
1817
1818 return 0;
1819
1820 err_reg:
1821 netif_napi_del(&priv->napi);
1822 free_irq(priv->pmt_irq, ndev);
1823 err_pmt_irq:
1824 free_irq(ndev->irq, ndev);
1825 err_irq:
1826 iounmap(priv->base);
1827 err_io:
1828 free_netdev(ndev);
1829 err_alloc:
1830 release_mem_region(res->start, resource_size(res));
1831 return ret;
1832 }
1833
1834 /**
1835 * xgmac_dvr_remove
1836 * @pdev: platform device pointer
1837 * Description: this function resets the TX/RX processes, disables the MAC RX/TX
1838 * changes the link status, releases the DMA descriptor rings,
1839 * unregisters the MDIO bus and unmaps the allocated memory.
1840 */
1841 static int xgmac_remove(struct platform_device *pdev)
1842 {
1843 struct net_device *ndev = platform_get_drvdata(pdev);
1844 struct xgmac_priv *priv = netdev_priv(ndev);
1845 struct resource *res;
1846
1847 xgmac_mac_disable(priv->base);
1848
1849 /* Free the IRQ lines */
1850 free_irq(ndev->irq, ndev);
1851 free_irq(priv->pmt_irq, ndev);
1852
1853 unregister_netdev(ndev);
1854 netif_napi_del(&priv->napi);
1855
1856 iounmap(priv->base);
1857 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
1858 release_mem_region(res->start, resource_size(res));
1859
1860 free_netdev(ndev);
1861
1862 return 0;
1863 }
1864
1865 #ifdef CONFIG_PM_SLEEP
1866 static void xgmac_pmt(void __iomem *ioaddr, unsigned long mode)
1867 {
1868 unsigned int pmt = 0;
1869
1870 if (mode & WAKE_MAGIC)
1871 pmt |= XGMAC_PMT_POWERDOWN | XGMAC_PMT_MAGIC_PKT_EN;
1872 if (mode & WAKE_UCAST)
1873 pmt |= XGMAC_PMT_POWERDOWN | XGMAC_PMT_GLBL_UNICAST;
1874
1875 writel(pmt, ioaddr + XGMAC_PMT);
1876 }
1877
1878 static int xgmac_suspend(struct device *dev)
1879 {
1880 struct net_device *ndev = platform_get_drvdata(to_platform_device(dev));
1881 struct xgmac_priv *priv = netdev_priv(ndev);
1882 u32 value;
1883
1884 if (!ndev || !netif_running(ndev))
1885 return 0;
1886
1887 netif_device_detach(ndev);
1888 napi_disable(&priv->napi);
1889 writel(0, priv->base + XGMAC_DMA_INTR_ENA);
1890
1891 if (device_may_wakeup(priv->device)) {
1892 /* Stop TX/RX DMA Only */
1893 value = readl(priv->base + XGMAC_DMA_CONTROL);
1894 value &= ~(DMA_CONTROL_ST | DMA_CONTROL_SR);
1895 writel(value, priv->base + XGMAC_DMA_CONTROL);
1896
1897 xgmac_pmt(priv->base, priv->wolopts);
1898 } else
1899 xgmac_mac_disable(priv->base);
1900
1901 return 0;
1902 }
1903
1904 static int xgmac_resume(struct device *dev)
1905 {
1906 struct net_device *ndev = platform_get_drvdata(to_platform_device(dev));
1907 struct xgmac_priv *priv = netdev_priv(ndev);
1908 void __iomem *ioaddr = priv->base;
1909
1910 if (!netif_running(ndev))
1911 return 0;
1912
1913 xgmac_pmt(ioaddr, 0);
1914
1915 /* Enable the MAC and DMA */
1916 xgmac_mac_enable(ioaddr);
1917 writel(DMA_INTR_DEFAULT_MASK, ioaddr + XGMAC_DMA_STATUS);
1918 writel(DMA_INTR_DEFAULT_MASK, ioaddr + XGMAC_DMA_INTR_ENA);
1919
1920 netif_device_attach(ndev);
1921 napi_enable(&priv->napi);
1922
1923 return 0;
1924 }
1925 #endif /* CONFIG_PM_SLEEP */
1926
1927 static SIMPLE_DEV_PM_OPS(xgmac_pm_ops, xgmac_suspend, xgmac_resume);
1928
1929 static const struct of_device_id xgmac_of_match[] = {
1930 { .compatible = "calxeda,hb-xgmac", },
1931 {},
1932 };
1933 MODULE_DEVICE_TABLE(of, xgmac_of_match);
1934
1935 static struct platform_driver xgmac_driver = {
1936 .driver = {
1937 .name = "calxedaxgmac",
1938 .of_match_table = xgmac_of_match,
1939 },
1940 .probe = xgmac_probe,
1941 .remove = xgmac_remove,
1942 .driver.pm = &xgmac_pm_ops,
1943 };
1944
1945 module_platform_driver(xgmac_driver);
1946
1947 MODULE_AUTHOR("Calxeda, Inc.");
1948 MODULE_DESCRIPTION("Calxeda 10G XGMAC driver");
1949 MODULE_LICENSE("GPL v2");
Linux with added FPC-III support