1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3  * Copyright 2010-2011 Calxeda, Inc.
4  */
5 #include <linux/module.h>
6 #include <linux/mod_devicetable.h>
7 #include <linux/kernel.h>
8 #include <linux/circ_buf.h>
9 #include <linux/interrupt.h>
10 #include <linux/etherdevice.h>
11 #include <linux/platform_device.h>
12 #include <linux/skbuff.h>
13 #include <linux/ethtool.h>
14 #include <linux/if.h>
15 #include <linux/crc32.h>
16 #include <linux/dma-mapping.h>
17 #include <linux/slab.h>
18 
19 /* XGMAC Register definitions */
20 #define XGMAC_CONTROL		0x00000000	/* MAC Configuration */
21 #define XGMAC_FRAME_FILTER	0x00000004	/* MAC Frame Filter */
22 #define XGMAC_FLOW_CTRL		0x00000018	/* MAC Flow Control */
23 #define XGMAC_VLAN_TAG		0x0000001C	/* VLAN Tags */
24 #define XGMAC_VERSION		0x00000020	/* Version */
25 #define XGMAC_VLAN_INCL		0x00000024	/* VLAN tag for tx frames */
26 #define XGMAC_LPI_CTRL		0x00000028	/* LPI Control and Status */
27 #define XGMAC_LPI_TIMER		0x0000002C	/* LPI Timers Control */
28 #define XGMAC_TX_PACE		0x00000030	/* Transmit Pace and Stretch */
29 #define XGMAC_VLAN_HASH		0x00000034	/* VLAN Hash Table */
30 #define XGMAC_DEBUG		0x00000038	/* Debug */
31 #define XGMAC_INT_STAT		0x0000003C	/* Interrupt and Control */
32 #define XGMAC_ADDR_HIGH(reg)	(0x00000040 + ((reg) * 8))
33 #define XGMAC_ADDR_LOW(reg)	(0x00000044 + ((reg) * 8))
34 #define XGMAC_HASH(n)		(0x00000300 + (n) * 4) /* HASH table regs */
35 #define XGMAC_NUM_HASH		16
36 #define XGMAC_OMR		0x00000400
37 #define XGMAC_REMOTE_WAKE	0x00000700	/* Remote Wake-Up Frm Filter */
38 #define XGMAC_PMT		0x00000704	/* PMT Control and Status */
39 #define XGMAC_MMC_CTRL		0x00000800	/* XGMAC MMC Control */
40 #define XGMAC_MMC_INTR_RX	0x00000804	/* Receive Interrupt */
41 #define XGMAC_MMC_INTR_TX	0x00000808	/* Transmit Interrupt */
42 #define XGMAC_MMC_INTR_MASK_RX	0x0000080c	/* Receive Interrupt Mask */
43 #define XGMAC_MMC_INTR_MASK_TX	0x00000810	/* Transmit Interrupt Mask */
44 
45 /* Hardware TX Statistics Counters */
46 #define XGMAC_MMC_TXOCTET_GB_LO	0x00000814
47 #define XGMAC_MMC_TXOCTET_GB_HI	0x00000818
48 #define XGMAC_MMC_TXFRAME_GB_LO	0x0000081C
49 #define XGMAC_MMC_TXFRAME_GB_HI	0x00000820
50 #define XGMAC_MMC_TXBCFRAME_G	0x00000824
51 #define XGMAC_MMC_TXMCFRAME_G	0x0000082C
52 #define XGMAC_MMC_TXUCFRAME_GB	0x00000864
53 #define XGMAC_MMC_TXMCFRAME_GB	0x0000086C
54 #define XGMAC_MMC_TXBCFRAME_GB	0x00000874
55 #define XGMAC_MMC_TXUNDERFLOW	0x0000087C
56 #define XGMAC_MMC_TXOCTET_G_LO	0x00000884
57 #define XGMAC_MMC_TXOCTET_G_HI	0x00000888
58 #define XGMAC_MMC_TXFRAME_G_LO	0x0000088C
59 #define XGMAC_MMC_TXFRAME_G_HI	0x00000890
60 #define XGMAC_MMC_TXPAUSEFRAME	0x00000894
61 #define XGMAC_MMC_TXVLANFRAME	0x0000089C
62 
63 /* Hardware RX Statistics Counters */
64 #define XGMAC_MMC_RXFRAME_GB_LO	0x00000900
65 #define XGMAC_MMC_RXFRAME_GB_HI	0x00000904
66 #define XGMAC_MMC_RXOCTET_GB_LO	0x00000908
67 #define XGMAC_MMC_RXOCTET_GB_HI	0x0000090C
68 #define XGMAC_MMC_RXOCTET_G_LO	0x00000910
69 #define XGMAC_MMC_RXOCTET_G_HI	0x00000914
70 #define XGMAC_MMC_RXBCFRAME_G	0x00000918
71 #define XGMAC_MMC_RXMCFRAME_G	0x00000920
72 #define XGMAC_MMC_RXCRCERR	0x00000928
73 #define XGMAC_MMC_RXRUNT	0x00000930
74 #define XGMAC_MMC_RXJABBER	0x00000934
75 #define XGMAC_MMC_RXUCFRAME_G	0x00000970
76 #define XGMAC_MMC_RXLENGTHERR	0x00000978
77 #define XGMAC_MMC_RXPAUSEFRAME	0x00000988
78 #define XGMAC_MMC_RXOVERFLOW	0x00000990
79 #define XGMAC_MMC_RXVLANFRAME	0x00000998
80 #define XGMAC_MMC_RXWATCHDOG	0x000009a0
81 
82 /* DMA Control and Status Registers */
83 #define XGMAC_DMA_BUS_MODE	0x00000f00	/* Bus Mode */
84 #define XGMAC_DMA_TX_POLL	0x00000f04	/* Transmit Poll Demand */
85 #define XGMAC_DMA_RX_POLL	0x00000f08	/* Received Poll Demand */
86 #define XGMAC_DMA_RX_BASE_ADDR	0x00000f0c	/* Receive List Base */
87 #define XGMAC_DMA_TX_BASE_ADDR	0x00000f10	/* Transmit List Base */
88 #define XGMAC_DMA_STATUS	0x00000f14	/* Status Register */
89 #define XGMAC_DMA_CONTROL	0x00000f18	/* Ctrl (Operational Mode) */
90 #define XGMAC_DMA_INTR_ENA	0x00000f1c	/* Interrupt Enable */
91 #define XGMAC_DMA_MISS_FRAME_CTR 0x00000f20	/* Missed Frame Counter */
92 #define XGMAC_DMA_RI_WDOG_TIMER	0x00000f24	/* RX Intr Watchdog Timer */
93 #define XGMAC_DMA_AXI_BUS	0x00000f28	/* AXI Bus Mode */
94 #define XGMAC_DMA_AXI_STATUS	0x00000f2C	/* AXI Status */
95 #define XGMAC_DMA_HW_FEATURE	0x00000f58	/* Enabled Hardware Features */
96 
97 #define XGMAC_ADDR_AE		0x80000000
98 
99 /* PMT Control and Status */
100 #define XGMAC_PMT_POINTER_RESET	0x80000000
101 #define XGMAC_PMT_GLBL_UNICAST	0x00000200
102 #define XGMAC_PMT_WAKEUP_RX_FRM	0x00000040
103 #define XGMAC_PMT_MAGIC_PKT	0x00000020
104 #define XGMAC_PMT_WAKEUP_FRM_EN	0x00000004
105 #define XGMAC_PMT_MAGIC_PKT_EN	0x00000002
106 #define XGMAC_PMT_POWERDOWN	0x00000001
107 
108 #define XGMAC_CONTROL_SPD	0x40000000	/* Speed control */
109 #define XGMAC_CONTROL_SPD_MASK	0x60000000
110 #define XGMAC_CONTROL_SPD_1G	0x60000000
111 #define XGMAC_CONTROL_SPD_2_5G	0x40000000
112 #define XGMAC_CONTROL_SPD_10G	0x00000000
113 #define XGMAC_CONTROL_SARC	0x10000000	/* Source Addr Insert/Replace */
114 #define XGMAC_CONTROL_SARK_MASK	0x18000000
115 #define XGMAC_CONTROL_CAR	0x04000000	/* CRC Addition/Replacement */
116 #define XGMAC_CONTROL_CAR_MASK	0x06000000
117 #define XGMAC_CONTROL_DP	0x01000000	/* Disable Padding */
118 #define XGMAC_CONTROL_WD	0x00800000	/* Disable Watchdog on rx */
119 #define XGMAC_CONTROL_JD	0x00400000	/* Jabber disable */
120 #define XGMAC_CONTROL_JE	0x00100000	/* Jumbo frame */
121 #define XGMAC_CONTROL_LM	0x00001000	/* Loop-back mode */
122 #define XGMAC_CONTROL_IPC	0x00000400	/* Checksum Offload */
123 #define XGMAC_CONTROL_ACS	0x00000080	/* Automatic Pad/FCS Strip */
124 #define XGMAC_CONTROL_DDIC	0x00000010	/* Disable Deficit Idle Count */
125 #define XGMAC_CONTROL_TE	0x00000008	/* Transmitter Enable */
126 #define XGMAC_CONTROL_RE	0x00000004	/* Receiver Enable */
127 
128 /* XGMAC Frame Filter defines */
129 #define XGMAC_FRAME_FILTER_PR	0x00000001	/* Promiscuous Mode */
130 #define XGMAC_FRAME_FILTER_HUC	0x00000002	/* Hash Unicast */
131 #define XGMAC_FRAME_FILTER_HMC	0x00000004	/* Hash Multicast */
132 #define XGMAC_FRAME_FILTER_DAIF	0x00000008	/* DA Inverse Filtering */
133 #define XGMAC_FRAME_FILTER_PM	0x00000010	/* Pass all multicast */
134 #define XGMAC_FRAME_FILTER_DBF	0x00000020	/* Disable Broadcast frames */
135 #define XGMAC_FRAME_FILTER_SAIF	0x00000100	/* Inverse Filtering */
136 #define XGMAC_FRAME_FILTER_SAF	0x00000200	/* Source Address Filter */
137 #define XGMAC_FRAME_FILTER_HPF	0x00000400	/* Hash or perfect Filter */
138 #define XGMAC_FRAME_FILTER_VHF	0x00000800	/* VLAN Hash Filter */
139 #define XGMAC_FRAME_FILTER_VPF	0x00001000	/* VLAN Perfect Filter */
140 #define XGMAC_FRAME_FILTER_RA	0x80000000	/* Receive all mode */
141 
142 /* XGMAC FLOW CTRL defines */
143 #define XGMAC_FLOW_CTRL_PT_MASK	0xffff0000	/* Pause Time Mask */
144 #define XGMAC_FLOW_CTRL_PT_SHIFT	16
145 #define XGMAC_FLOW_CTRL_DZQP	0x00000080	/* Disable Zero-Quanta Phase */
146 #define XGMAC_FLOW_CTRL_PLT	0x00000020	/* Pause Low Threshold */
147 #define XGMAC_FLOW_CTRL_PLT_MASK 0x00000030	/* PLT MASK */
148 #define XGMAC_FLOW_CTRL_UP	0x00000008	/* Unicast Pause Frame Detect */
149 #define XGMAC_FLOW_CTRL_RFE	0x00000004	/* Rx Flow Control Enable */
150 #define XGMAC_FLOW_CTRL_TFE	0x00000002	/* Tx Flow Control Enable */
151 #define XGMAC_FLOW_CTRL_FCB_BPA	0x00000001	/* Flow Control Busy ... */
152 
153 /* XGMAC_INT_STAT reg */
154 #define XGMAC_INT_STAT_PMTIM	0x00800000	/* PMT Interrupt Mask */
155 #define XGMAC_INT_STAT_PMT	0x0080		/* PMT Interrupt Status */
156 #define XGMAC_INT_STAT_LPI	0x0040		/* LPI Interrupt Status */
157 
158 /* DMA Bus Mode register defines */
159 #define DMA_BUS_MODE_SFT_RESET	0x00000001	/* Software Reset */
160 #define DMA_BUS_MODE_DSL_MASK	0x0000007c	/* Descriptor Skip Length */
161 #define DMA_BUS_MODE_DSL_SHIFT	2		/* (in DWORDS) */
162 #define DMA_BUS_MODE_ATDS	0x00000080	/* Alternate Descriptor Size */
163 
164 /* Programmable burst length */
165 #define DMA_BUS_MODE_PBL_MASK	0x00003f00	/* Programmable Burst Len */
166 #define DMA_BUS_MODE_PBL_SHIFT	8
167 #define DMA_BUS_MODE_FB		0x00010000	/* Fixed burst */
168 #define DMA_BUS_MODE_RPBL_MASK	0x003e0000	/* Rx-Programmable Burst Len */
169 #define DMA_BUS_MODE_RPBL_SHIFT	17
170 #define DMA_BUS_MODE_USP	0x00800000
171 #define DMA_BUS_MODE_8PBL	0x01000000
172 #define DMA_BUS_MODE_AAL	0x02000000
173 
174 /* DMA Bus Mode register defines */
175 #define DMA_BUS_PR_RATIO_MASK	0x0000c000	/* Rx/Tx priority ratio */
176 #define DMA_BUS_PR_RATIO_SHIFT	14
177 #define DMA_BUS_FB		0x00010000	/* Fixed Burst */
178 
179 /* DMA Control register defines */
180 #define DMA_CONTROL_ST		0x00002000	/* Start/Stop Transmission */
181 #define DMA_CONTROL_SR		0x00000002	/* Start/Stop Receive */
182 #define DMA_CONTROL_DFF		0x01000000	/* Disable flush of rx frames */
183 #define DMA_CONTROL_OSF		0x00000004	/* Operate on 2nd tx frame */
184 
185 /* DMA Normal interrupt */
186 #define DMA_INTR_ENA_NIE	0x00010000	/* Normal Summary */
187 #define DMA_INTR_ENA_AIE	0x00008000	/* Abnormal Summary */
188 #define DMA_INTR_ENA_ERE	0x00004000	/* Early Receive */
189 #define DMA_INTR_ENA_FBE	0x00002000	/* Fatal Bus Error */
190 #define DMA_INTR_ENA_ETE	0x00000400	/* Early Transmit */
191 #define DMA_INTR_ENA_RWE	0x00000200	/* Receive Watchdog */
192 #define DMA_INTR_ENA_RSE	0x00000100	/* Receive Stopped */
193 #define DMA_INTR_ENA_RUE	0x00000080	/* Receive Buffer Unavailable */
194 #define DMA_INTR_ENA_RIE	0x00000040	/* Receive Interrupt */
195 #define DMA_INTR_ENA_UNE	0x00000020	/* Tx Underflow */
196 #define DMA_INTR_ENA_OVE	0x00000010	/* Receive Overflow */
197 #define DMA_INTR_ENA_TJE	0x00000008	/* Transmit Jabber */
198 #define DMA_INTR_ENA_TUE	0x00000004	/* Transmit Buffer Unavail */
199 #define DMA_INTR_ENA_TSE	0x00000002	/* Transmit Stopped */
200 #define DMA_INTR_ENA_TIE	0x00000001	/* Transmit Interrupt */
201 
202 #define DMA_INTR_NORMAL		(DMA_INTR_ENA_NIE | DMA_INTR_ENA_RIE | \
203 				 DMA_INTR_ENA_TUE | DMA_INTR_ENA_TIE)
204 
205 #define DMA_INTR_ABNORMAL	(DMA_INTR_ENA_AIE | DMA_INTR_ENA_FBE | \
206 				 DMA_INTR_ENA_RWE | DMA_INTR_ENA_RSE | \
207 				 DMA_INTR_ENA_RUE | DMA_INTR_ENA_UNE | \
208 				 DMA_INTR_ENA_OVE | DMA_INTR_ENA_TJE | \
209 				 DMA_INTR_ENA_TSE)
210 
211 /* DMA default interrupt mask */
212 #define DMA_INTR_DEFAULT_MASK	(DMA_INTR_NORMAL | DMA_INTR_ABNORMAL)
213 
214 /* DMA Status register defines */
215 #define DMA_STATUS_GMI		0x08000000	/* MMC interrupt */
216 #define DMA_STATUS_GLI		0x04000000	/* GMAC Line interface int */
217 #define DMA_STATUS_EB_MASK	0x00380000	/* Error Bits Mask */
218 #define DMA_STATUS_EB_TX_ABORT	0x00080000	/* Error Bits - TX Abort */
219 #define DMA_STATUS_EB_RX_ABORT	0x00100000	/* Error Bits - RX Abort */
220 #define DMA_STATUS_TS_MASK	0x00700000	/* Transmit Process State */
221 #define DMA_STATUS_TS_SHIFT	20
222 #define DMA_STATUS_RS_MASK	0x000e0000	/* Receive Process State */
223 #define DMA_STATUS_RS_SHIFT	17
224 #define DMA_STATUS_NIS		0x00010000	/* Normal Interrupt Summary */
225 #define DMA_STATUS_AIS		0x00008000	/* Abnormal Interrupt Summary */
226 #define DMA_STATUS_ERI		0x00004000	/* Early Receive Interrupt */
227 #define DMA_STATUS_FBI		0x00002000	/* Fatal Bus Error Interrupt */
228 #define DMA_STATUS_ETI		0x00000400	/* Early Transmit Interrupt */
229 #define DMA_STATUS_RWT		0x00000200	/* Receive Watchdog Timeout */
230 #define DMA_STATUS_RPS		0x00000100	/* Receive Process Stopped */
231 #define DMA_STATUS_RU		0x00000080	/* Receive Buffer Unavailable */
232 #define DMA_STATUS_RI		0x00000040	/* Receive Interrupt */
233 #define DMA_STATUS_UNF		0x00000020	/* Transmit Underflow */
234 #define DMA_STATUS_OVF		0x00000010	/* Receive Overflow */
235 #define DMA_STATUS_TJT		0x00000008	/* Transmit Jabber Timeout */
236 #define DMA_STATUS_TU		0x00000004	/* Transmit Buffer Unavail */
237 #define DMA_STATUS_TPS		0x00000002	/* Transmit Process Stopped */
238 #define DMA_STATUS_TI		0x00000001	/* Transmit Interrupt */
239 
240 /* Common MAC defines */
241 #define MAC_ENABLE_TX		0x00000008	/* Transmitter Enable */
242 #define MAC_ENABLE_RX		0x00000004	/* Receiver Enable */
243 
244 /* XGMAC Operation Mode Register */
245 #define XGMAC_OMR_TSF		0x00200000	/* TX FIFO Store and Forward */
246 #define XGMAC_OMR_FTF		0x00100000	/* Flush Transmit FIFO */
247 #define XGMAC_OMR_TTC		0x00020000	/* Transmit Threshold Ctrl */
248 #define XGMAC_OMR_TTC_MASK	0x00030000
249 #define XGMAC_OMR_RFD		0x00006000	/* FC Deactivation Threshold */
250 #define XGMAC_OMR_RFD_MASK	0x00007000	/* FC Deact Threshold MASK */
251 #define XGMAC_OMR_RFA		0x00000600	/* FC Activation Threshold */
252 #define XGMAC_OMR_RFA_MASK	0x00000E00	/* FC Act Threshold MASK */
253 #define XGMAC_OMR_EFC		0x00000100	/* Enable Hardware FC */
254 #define XGMAC_OMR_FEF		0x00000080	/* Forward Error Frames */
255 #define XGMAC_OMR_DT		0x00000040	/* Drop TCP/IP csum Errors */
256 #define XGMAC_OMR_RSF		0x00000020	/* RX FIFO Store and Forward */
257 #define XGMAC_OMR_RTC_256	0x00000018	/* RX Threshold Ctrl */
258 #define XGMAC_OMR_RTC_MASK	0x00000018	/* RX Threshold Ctrl MASK */
259 
260 /* XGMAC HW Features Register */
261 #define DMA_HW_FEAT_TXCOESEL	0x00010000	/* TX Checksum offload */
262 
263 #define XGMAC_MMC_CTRL_CNT_FRZ	0x00000008
264 
265 /* XGMAC Descriptor Defines */
266 #define MAX_DESC_BUF_SZ		(0x2000 - 8)
267 
268 #define RXDESC_EXT_STATUS	0x00000001
269 #define RXDESC_CRC_ERR		0x00000002
270 #define RXDESC_RX_ERR		0x00000008
271 #define RXDESC_RX_WDOG		0x00000010
272 #define RXDESC_FRAME_TYPE	0x00000020
273 #define RXDESC_GIANT_FRAME	0x00000080
274 #define RXDESC_LAST_SEG		0x00000100
275 #define RXDESC_FIRST_SEG	0x00000200
276 #define RXDESC_VLAN_FRAME	0x00000400
277 #define RXDESC_OVERFLOW_ERR	0x00000800
278 #define RXDESC_LENGTH_ERR	0x00001000
279 #define RXDESC_SA_FILTER_FAIL	0x00002000
280 #define RXDESC_DESCRIPTOR_ERR	0x00004000
281 #define RXDESC_ERROR_SUMMARY	0x00008000
282 #define RXDESC_FRAME_LEN_OFFSET	16
283 #define RXDESC_FRAME_LEN_MASK	0x3fff0000
284 #define RXDESC_DA_FILTER_FAIL	0x40000000
285 
286 #define RXDESC1_END_RING	0x00008000
287 
288 #define RXDESC_IP_PAYLOAD_MASK	0x00000003
289 #define RXDESC_IP_PAYLOAD_UDP	0x00000001
290 #define RXDESC_IP_PAYLOAD_TCP	0x00000002
291 #define RXDESC_IP_PAYLOAD_ICMP	0x00000003
292 #define RXDESC_IP_HEADER_ERR	0x00000008
293 #define RXDESC_IP_PAYLOAD_ERR	0x00000010
294 #define RXDESC_IPV4_PACKET	0x00000040
295 #define RXDESC_IPV6_PACKET	0x00000080
296 #define TXDESC_UNDERFLOW_ERR	0x00000001
297 #define TXDESC_JABBER_TIMEOUT	0x00000002
298 #define TXDESC_LOCAL_FAULT	0x00000004
299 #define TXDESC_REMOTE_FAULT	0x00000008
300 #define TXDESC_VLAN_FRAME	0x00000010
301 #define TXDESC_FRAME_FLUSHED	0x00000020
302 #define TXDESC_IP_HEADER_ERR	0x00000040
303 #define TXDESC_PAYLOAD_CSUM_ERR	0x00000080
304 #define TXDESC_ERROR_SUMMARY	0x00008000
305 #define TXDESC_SA_CTRL_INSERT	0x00040000
306 #define TXDESC_SA_CTRL_REPLACE	0x00080000
307 #define TXDESC_2ND_ADDR_CHAINED	0x00100000
308 #define TXDESC_END_RING		0x00200000
309 #define TXDESC_CSUM_IP		0x00400000
310 #define TXDESC_CSUM_IP_PAYLD	0x00800000
311 #define TXDESC_CSUM_ALL		0x00C00000
312 #define TXDESC_CRC_EN_REPLACE	0x01000000
313 #define TXDESC_CRC_EN_APPEND	0x02000000
314 #define TXDESC_DISABLE_PAD	0x04000000
315 #define TXDESC_FIRST_SEG	0x10000000
316 #define TXDESC_LAST_SEG		0x20000000
317 #define TXDESC_INTERRUPT	0x40000000
318 
319 #define DESC_OWN		0x80000000
320 #define DESC_BUFFER1_SZ_MASK	0x00001fff
321 #define DESC_BUFFER2_SZ_MASK	0x1fff0000
322 #define DESC_BUFFER2_SZ_OFFSET	16
323 
324 struct xgmac_dma_desc {
325 	__le32 flags;
326 	__le32 buf_size;
327 	__le32 buf1_addr;		/* Buffer 1 Address Pointer */
328 	__le32 buf2_addr;		/* Buffer 2 Address Pointer */
329 	__le32 ext_status;
330 	__le32 res[3];
331 };
332 
333 struct xgmac_extra_stats {
334 	/* Transmit errors */
335 	unsigned long tx_jabber;
336 	unsigned long tx_frame_flushed;
337 	unsigned long tx_payload_error;
338 	unsigned long tx_ip_header_error;
339 	unsigned long tx_local_fault;
340 	unsigned long tx_remote_fault;
341 	/* Receive errors */
342 	unsigned long rx_watchdog;
343 	unsigned long rx_da_filter_fail;
344 	unsigned long rx_payload_error;
345 	unsigned long rx_ip_header_error;
346 	/* Tx/Rx IRQ errors */
347 	unsigned long tx_process_stopped;
348 	unsigned long rx_buf_unav;
349 	unsigned long rx_process_stopped;
350 	unsigned long tx_early;
351 	unsigned long fatal_bus_error;
352 };
353 
354 struct xgmac_priv {
355 	struct xgmac_dma_desc *dma_rx;
356 	struct sk_buff **rx_skbuff;
357 	unsigned int rx_tail;
358 	unsigned int rx_head;
359 
360 	struct xgmac_dma_desc *dma_tx;
361 	struct sk_buff **tx_skbuff;
362 	unsigned int tx_head;
363 	unsigned int tx_tail;
364 	int tx_irq_cnt;
365 
366 	void __iomem *base;
367 	unsigned int dma_buf_sz;
368 	dma_addr_t dma_rx_phy;
369 	dma_addr_t dma_tx_phy;
370 
371 	struct net_device *dev;
372 	struct device *device;
373 	struct napi_struct napi;
374 
375 	int max_macs;
376 	struct xgmac_extra_stats xstats;
377 
378 	spinlock_t stats_lock;
379 	int pmt_irq;
380 	char rx_pause;
381 	char tx_pause;
382 	int wolopts;
383 	struct work_struct tx_timeout_work;
384 };
385 
386 /* XGMAC Configuration Settings */
387 #define XGMAC_MAX_MTU		9000
388 #define PAUSE_TIME		0x400
389 
390 #define DMA_RX_RING_SZ		256
391 #define DMA_TX_RING_SZ		128
392 /* minimum number of free TX descriptors required to wake up TX process */
393 #define TX_THRESH		(DMA_TX_RING_SZ/4)
394 
395 /* DMA descriptor ring helpers */
396 #define dma_ring_incr(n, s)	(((n) + 1) & ((s) - 1))
397 #define dma_ring_space(h, t, s)	CIRC_SPACE(h, t, s)
398 #define dma_ring_cnt(h, t, s)	CIRC_CNT(h, t, s)
399 
400 #define tx_dma_ring_space(p) \
401 	dma_ring_space((p)->tx_head, (p)->tx_tail, DMA_TX_RING_SZ)
402 
403 /* XGMAC Descriptor Access Helpers */
404 static inline void desc_set_buf_len(struct xgmac_dma_desc *p, u32 buf_sz)
405 {
406 	if (buf_sz > MAX_DESC_BUF_SZ)
407 		p->buf_size = cpu_to_le32(MAX_DESC_BUF_SZ |
408 			(buf_sz - MAX_DESC_BUF_SZ) << DESC_BUFFER2_SZ_OFFSET);
409 	else
410 		p->buf_size = cpu_to_le32(buf_sz);
411 }
412 
413 static inline int desc_get_buf_len(struct xgmac_dma_desc *p)
414 {
415 	u32 len = le32_to_cpu(p->buf_size);
416 	return (len & DESC_BUFFER1_SZ_MASK) +
417 		((len & DESC_BUFFER2_SZ_MASK) >> DESC_BUFFER2_SZ_OFFSET);
418 }
419 
420 static inline void desc_init_rx_desc(struct xgmac_dma_desc *p, int ring_size,
421 				     int buf_sz)
422 {
423 	struct xgmac_dma_desc *end = p + ring_size - 1;
424 
425 	memset(p, 0, sizeof(*p) * ring_size);
426 
427 	for (; p <= end; p++)
428 		desc_set_buf_len(p, buf_sz);
429 
430 	end->buf_size |= cpu_to_le32(RXDESC1_END_RING);
431 }
432 
433 static inline void desc_init_tx_desc(struct xgmac_dma_desc *p, u32 ring_size)
434 {
435 	memset(p, 0, sizeof(*p) * ring_size);
436 	p[ring_size - 1].flags = cpu_to_le32(TXDESC_END_RING);
437 }
438 
439 static inline int desc_get_owner(struct xgmac_dma_desc *p)
440 {
441 	return le32_to_cpu(p->flags) & DESC_OWN;
442 }
443 
444 static inline void desc_set_rx_owner(struct xgmac_dma_desc *p)
445 {
446 	/* Clear all fields and set the owner */
447 	p->flags = cpu_to_le32(DESC_OWN);
448 }
449 
450 static inline void desc_set_tx_owner(struct xgmac_dma_desc *p, u32 flags)
451 {
452 	u32 tmpflags = le32_to_cpu(p->flags);
453 	tmpflags &= TXDESC_END_RING;
454 	tmpflags |= flags | DESC_OWN;
455 	p->flags = cpu_to_le32(tmpflags);
456 }
457 
458 static inline void desc_clear_tx_owner(struct xgmac_dma_desc *p)
459 {
460 	u32 tmpflags = le32_to_cpu(p->flags);
461 	tmpflags &= TXDESC_END_RING;
462 	p->flags = cpu_to_le32(tmpflags);
463 }
464 
465 static inline int desc_get_tx_ls(struct xgmac_dma_desc *p)
466 {
467 	return le32_to_cpu(p->flags) & TXDESC_LAST_SEG;
468 }
469 
470 static inline int desc_get_tx_fs(struct xgmac_dma_desc *p)
471 {
472 	return le32_to_cpu(p->flags) & TXDESC_FIRST_SEG;
473 }
474 
475 static inline u32 desc_get_buf_addr(struct xgmac_dma_desc *p)
476 {
477 	return le32_to_cpu(p->buf1_addr);
478 }
479 
480 static inline void desc_set_buf_addr(struct xgmac_dma_desc *p,
481 				     u32 paddr, int len)
482 {
483 	p->buf1_addr = cpu_to_le32(paddr);
484 	if (len > MAX_DESC_BUF_SZ)
485 		p->buf2_addr = cpu_to_le32(paddr + MAX_DESC_BUF_SZ);
486 }
487 
488 static inline void desc_set_buf_addr_and_size(struct xgmac_dma_desc *p,
489 					      u32 paddr, int len)
490 {
491 	desc_set_buf_len(p, len);
492 	desc_set_buf_addr(p, paddr, len);
493 }
494 
495 static inline int desc_get_rx_frame_len(struct xgmac_dma_desc *p)
496 {
497 	u32 data = le32_to_cpu(p->flags);
498 	u32 len = (data & RXDESC_FRAME_LEN_MASK) >> RXDESC_FRAME_LEN_OFFSET;
499 	if (data & RXDESC_FRAME_TYPE)
500 		len -= ETH_FCS_LEN;
501 
502 	return len;
503 }
504 
505 static void xgmac_dma_flush_tx_fifo(void __iomem *ioaddr)
506 {
507 	int timeout = 1000;
508 	u32 reg = readl(ioaddr + XGMAC_OMR);
509 	writel(reg | XGMAC_OMR_FTF, ioaddr + XGMAC_OMR);
510 
511 	while ((timeout-- > 0) && readl(ioaddr + XGMAC_OMR) & XGMAC_OMR_FTF)
512 		udelay(1);
513 }
514 
515 static int desc_get_tx_status(struct xgmac_priv *priv, struct xgmac_dma_desc *p)
516 {
517 	struct xgmac_extra_stats *x = &priv->xstats;
518 	u32 status = le32_to_cpu(p->flags);
519 
520 	if (!(status & TXDESC_ERROR_SUMMARY))
521 		return 0;
522 
523 	netdev_dbg(priv->dev, "tx desc error = 0x%08x\n", status);
524 	if (status & TXDESC_JABBER_TIMEOUT)
525 		x->tx_jabber++;
526 	if (status & TXDESC_FRAME_FLUSHED)
527 		x->tx_frame_flushed++;
528 	if (status & TXDESC_UNDERFLOW_ERR)
529 		xgmac_dma_flush_tx_fifo(priv->base);
530 	if (status & TXDESC_IP_HEADER_ERR)
531 		x->tx_ip_header_error++;
532 	if (status & TXDESC_LOCAL_FAULT)
533 		x->tx_local_fault++;
534 	if (status & TXDESC_REMOTE_FAULT)
535 		x->tx_remote_fault++;
536 	if (status & TXDESC_PAYLOAD_CSUM_ERR)
537 		x->tx_payload_error++;
538 
539 	return -1;
540 }
541 
542 static int desc_get_rx_status(struct xgmac_priv *priv, struct xgmac_dma_desc *p)
543 {
544 	struct xgmac_extra_stats *x = &priv->xstats;
545 	int ret = CHECKSUM_UNNECESSARY;
546 	u32 status = le32_to_cpu(p->flags);
547 	u32 ext_status = le32_to_cpu(p->ext_status);
548 
549 	if (status & RXDESC_DA_FILTER_FAIL) {
550 		netdev_dbg(priv->dev, "XGMAC RX : Dest Address filter fail\n");
551 		x->rx_da_filter_fail++;
552 		return -1;
553 	}
554 
555 	/* All frames should fit into a single buffer */
556 	if (!(status & RXDESC_FIRST_SEG) || !(status & RXDESC_LAST_SEG))
557 		return -1;
558 
559 	/* Check if packet has checksum already */
560 	if ((status & RXDESC_FRAME_TYPE) && (status & RXDESC_EXT_STATUS) &&
561 		!(ext_status & RXDESC_IP_PAYLOAD_MASK))
562 		ret = CHECKSUM_NONE;
563 
564 	netdev_dbg(priv->dev, "rx status - frame type=%d, csum = %d, ext stat %08x\n",
565 		   (status & RXDESC_FRAME_TYPE) ? 1 : 0, ret, ext_status);
566 
567 	if (!(status & RXDESC_ERROR_SUMMARY))
568 		return ret;
569 
570 	/* Handle any errors */
571 	if (status & (RXDESC_DESCRIPTOR_ERR | RXDESC_OVERFLOW_ERR |
572 		RXDESC_GIANT_FRAME | RXDESC_LENGTH_ERR | RXDESC_CRC_ERR))
573 		return -1;
574 
575 	if (status & RXDESC_EXT_STATUS) {
576 		if (ext_status & RXDESC_IP_HEADER_ERR)
577 			x->rx_ip_header_error++;
578 		if (ext_status & RXDESC_IP_PAYLOAD_ERR)
579 			x->rx_payload_error++;
580 		netdev_dbg(priv->dev, "IP checksum error - stat %08x\n",
581 			   ext_status);
582 		return CHECKSUM_NONE;
583 	}
584 
585 	return ret;
586 }
587 
588 static inline void xgmac_mac_enable(void __iomem *ioaddr)
589 {
590 	u32 value = readl(ioaddr + XGMAC_CONTROL);
591 	value |= MAC_ENABLE_RX | MAC_ENABLE_TX;
592 	writel(value, ioaddr + XGMAC_CONTROL);
593 
594 	value = readl(ioaddr + XGMAC_DMA_CONTROL);
595 	value |= DMA_CONTROL_ST | DMA_CONTROL_SR;
596 	writel(value, ioaddr + XGMAC_DMA_CONTROL);
597 }
598 
599 static inline void xgmac_mac_disable(void __iomem *ioaddr)
600 {
601 	u32 value = readl(ioaddr + XGMAC_DMA_CONTROL);
602 	value &= ~(DMA_CONTROL_ST | DMA_CONTROL_SR);
603 	writel(value, ioaddr + XGMAC_DMA_CONTROL);
604 
605 	value = readl(ioaddr + XGMAC_CONTROL);
606 	value &= ~(MAC_ENABLE_TX | MAC_ENABLE_RX);
607 	writel(value, ioaddr + XGMAC_CONTROL);
608 }
609 
610 static void xgmac_set_mac_addr(void __iomem *ioaddr, const unsigned char *addr,
611 			       int num)
612 {
613 	u32 data;
614 
615 	if (addr) {
616 		data = (addr[5] << 8) | addr[4] | (num ? XGMAC_ADDR_AE : 0);
617 		writel(data, ioaddr + XGMAC_ADDR_HIGH(num));
618 		data = (addr[3] << 24) | (addr[2] << 16) | (addr[1] << 8) | addr[0];
619 		writel(data, ioaddr + XGMAC_ADDR_LOW(num));
620 	} else {
621 		writel(0, ioaddr + XGMAC_ADDR_HIGH(num));
622 		writel(0, ioaddr + XGMAC_ADDR_LOW(num));
623 	}
624 }
625 
626 static void xgmac_get_mac_addr(void __iomem *ioaddr, unsigned char *addr,
627 			       int num)
628 {
629 	u32 hi_addr, lo_addr;
630 
631 	/* Read the MAC address from the hardware */
632 	hi_addr = readl(ioaddr + XGMAC_ADDR_HIGH(num));
633 	lo_addr = readl(ioaddr + XGMAC_ADDR_LOW(num));
634 
635 	/* Extract the MAC address from the high and low words */
636 	addr[0] = lo_addr & 0xff;
637 	addr[1] = (lo_addr >> 8) & 0xff;
638 	addr[2] = (lo_addr >> 16) & 0xff;
639 	addr[3] = (lo_addr >> 24) & 0xff;
640 	addr[4] = hi_addr & 0xff;
641 	addr[5] = (hi_addr >> 8) & 0xff;
642 }
643 
644 static int xgmac_set_flow_ctrl(struct xgmac_priv *priv, int rx, int tx)
645 {
646 	u32 reg;
647 	unsigned int flow = 0;
648 
649 	priv->rx_pause = rx;
650 	priv->tx_pause = tx;
651 
652 	if (rx || tx) {
653 		if (rx)
654 			flow |= XGMAC_FLOW_CTRL_RFE;
655 		if (tx)
656 			flow |= XGMAC_FLOW_CTRL_TFE;
657 
658 		flow |= XGMAC_FLOW_CTRL_PLT | XGMAC_FLOW_CTRL_UP;
659 		flow |= (PAUSE_TIME << XGMAC_FLOW_CTRL_PT_SHIFT);
660 
661 		writel(flow, priv->base + XGMAC_FLOW_CTRL);
662 
663 		reg = readl(priv->base + XGMAC_OMR);
664 		reg |= XGMAC_OMR_EFC;
665 		writel(reg, priv->base + XGMAC_OMR);
666 	} else {
667 		writel(0, priv->base + XGMAC_FLOW_CTRL);
668 
669 		reg = readl(priv->base + XGMAC_OMR);
670 		reg &= ~XGMAC_OMR_EFC;
671 		writel(reg, priv->base + XGMAC_OMR);
672 	}
673 
674 	return 0;
675 }
676 
677 static void xgmac_rx_refill(struct xgmac_priv *priv)
678 {
679 	struct xgmac_dma_desc *p;
680 	dma_addr_t paddr;
681 	int bufsz = priv->dev->mtu + ETH_HLEN + ETH_FCS_LEN;
682 
683 	while (dma_ring_space(priv->rx_head, priv->rx_tail, DMA_RX_RING_SZ) > 1) {
684 		int entry = priv->rx_head;
685 		struct sk_buff *skb;
686 
687 		p = priv->dma_rx + entry;
688 
689 		if (priv->rx_skbuff[entry] == NULL) {
690 			skb = netdev_alloc_skb_ip_align(priv->dev, bufsz);
691 			if (unlikely(skb == NULL))
692 				break;
693 
694 			paddr = dma_map_single(priv->device, skb->data,
695 					       priv->dma_buf_sz - NET_IP_ALIGN,
696 					       DMA_FROM_DEVICE);
697 			if (dma_mapping_error(priv->device, paddr)) {
698 				dev_kfree_skb_any(skb);
699 				break;
700 			}
701 			priv->rx_skbuff[entry] = skb;
702 			desc_set_buf_addr(p, paddr, priv->dma_buf_sz);
703 		}
704 
705 		netdev_dbg(priv->dev, "rx ring: head %d, tail %d\n",
706 			priv->rx_head, priv->rx_tail);
707 
708 		priv->rx_head = dma_ring_incr(priv->rx_head, DMA_RX_RING_SZ);
709 		desc_set_rx_owner(p);
710 	}
711 }
712 
713 /**
714  * xgmac_dma_desc_rings_init - init the RX/TX descriptor rings
715  * @dev: net device structure
716  * Description:  this function initializes the DMA RX/TX descriptors
717  * and allocates the socket buffers.
718  */
719 static int xgmac_dma_desc_rings_init(struct net_device *dev)
720 {
721 	struct xgmac_priv *priv = netdev_priv(dev);
722 	unsigned int bfsize;
723 
724 	/* Set the Buffer size according to the MTU;
725 	 * The total buffer size including any IP offset must be a multiple
726 	 * of 8 bytes.
727 	 */
728 	bfsize = ALIGN(dev->mtu + ETH_HLEN + ETH_FCS_LEN + NET_IP_ALIGN, 8);
729 
730 	netdev_dbg(priv->dev, "mtu [%d] bfsize [%d]\n", dev->mtu, bfsize);
731 
732 	priv->rx_skbuff = kcalloc(DMA_RX_RING_SZ, sizeof(struct sk_buff *),
733 				  GFP_KERNEL);
734 	if (!priv->rx_skbuff)
735 		return -ENOMEM;
736 
737 	priv->dma_rx = dma_alloc_coherent(priv->device,
738 					  DMA_RX_RING_SZ *
739 					  sizeof(struct xgmac_dma_desc),
740 					  &priv->dma_rx_phy,
741 					  GFP_KERNEL);
742 	if (!priv->dma_rx)
743 		goto err_dma_rx;
744 
745 	priv->tx_skbuff = kcalloc(DMA_TX_RING_SZ, sizeof(struct sk_buff *),
746 				  GFP_KERNEL);
747 	if (!priv->tx_skbuff)
748 		goto err_tx_skb;
749 
750 	priv->dma_tx = dma_alloc_coherent(priv->device,
751 					  DMA_TX_RING_SZ *
752 					  sizeof(struct xgmac_dma_desc),
753 					  &priv->dma_tx_phy,
754 					  GFP_KERNEL);
755 	if (!priv->dma_tx)
756 		goto err_dma_tx;
757 
758 	netdev_dbg(priv->dev, "DMA desc rings: virt addr (Rx %p, "
759 	    "Tx %p)\n\tDMA phy addr (Rx 0x%08x, Tx 0x%08x)\n",
760 	    priv->dma_rx, priv->dma_tx,
761 	    (unsigned int)priv->dma_rx_phy, (unsigned int)priv->dma_tx_phy);
762 
763 	priv->rx_tail = 0;
764 	priv->rx_head = 0;
765 	priv->dma_buf_sz = bfsize;
766 	desc_init_rx_desc(priv->dma_rx, DMA_RX_RING_SZ, priv->dma_buf_sz);
767 	xgmac_rx_refill(priv);
768 
769 	priv->tx_tail = 0;
770 	priv->tx_head = 0;
771 	desc_init_tx_desc(priv->dma_tx, DMA_TX_RING_SZ);
772 
773 	writel(priv->dma_tx_phy, priv->base + XGMAC_DMA_TX_BASE_ADDR);
774 	writel(priv->dma_rx_phy, priv->base + XGMAC_DMA_RX_BASE_ADDR);
775 
776 	return 0;
777 
778 err_dma_tx:
779 	kfree(priv->tx_skbuff);
780 err_tx_skb:
781 	dma_free_coherent(priv->device,
782 			  DMA_RX_RING_SZ * sizeof(struct xgmac_dma_desc),
783 			  priv->dma_rx, priv->dma_rx_phy);
784 err_dma_rx:
785 	kfree(priv->rx_skbuff);
786 	return -ENOMEM;
787 }
788 
789 static void xgmac_free_rx_skbufs(struct xgmac_priv *priv)
790 {
791 	int i;
792 	struct xgmac_dma_desc *p;
793 
794 	if (!priv->rx_skbuff)
795 		return;
796 
797 	for (i = 0; i < DMA_RX_RING_SZ; i++) {
798 		struct sk_buff *skb = priv->rx_skbuff[i];
799 		if (skb == NULL)
800 			continue;
801 
802 		p = priv->dma_rx + i;
803 		dma_unmap_single(priv->device, desc_get_buf_addr(p),
804 				 priv->dma_buf_sz - NET_IP_ALIGN, DMA_FROM_DEVICE);
805 		dev_kfree_skb_any(skb);
806 		priv->rx_skbuff[i] = NULL;
807 	}
808 }
809 
810 static void xgmac_free_tx_skbufs(struct xgmac_priv *priv)
811 {
812 	int i;
813 	struct xgmac_dma_desc *p;
814 
815 	if (!priv->tx_skbuff)
816 		return;
817 
818 	for (i = 0; i < DMA_TX_RING_SZ; i++) {
819 		if (priv->tx_skbuff[i] == NULL)
820 			continue;
821 
822 		p = priv->dma_tx + i;
823 		if (desc_get_tx_fs(p))
824 			dma_unmap_single(priv->device, desc_get_buf_addr(p),
825 					 desc_get_buf_len(p), DMA_TO_DEVICE);
826 		else
827 			dma_unmap_page(priv->device, desc_get_buf_addr(p),
828 				       desc_get_buf_len(p), DMA_TO_DEVICE);
829 
830 		if (desc_get_tx_ls(p))
831 			dev_kfree_skb_any(priv->tx_skbuff[i]);
832 		priv->tx_skbuff[i] = NULL;
833 	}
834 }
835 
836 static void xgmac_free_dma_desc_rings(struct xgmac_priv *priv)
837 {
838 	/* Release the DMA TX/RX socket buffers */
839 	xgmac_free_rx_skbufs(priv);
840 	xgmac_free_tx_skbufs(priv);
841 
842 	/* Free the consistent memory allocated for descriptor rings */
843 	if (priv->dma_tx) {
844 		dma_free_coherent(priv->device,
845 				  DMA_TX_RING_SZ * sizeof(struct xgmac_dma_desc),
846 				  priv->dma_tx, priv->dma_tx_phy);
847 		priv->dma_tx = NULL;
848 	}
849 	if (priv->dma_rx) {
850 		dma_free_coherent(priv->device,
851 				  DMA_RX_RING_SZ * sizeof(struct xgmac_dma_desc),
852 				  priv->dma_rx, priv->dma_rx_phy);
853 		priv->dma_rx = NULL;
854 	}
855 	kfree(priv->rx_skbuff);
856 	priv->rx_skbuff = NULL;
857 	kfree(priv->tx_skbuff);
858 	priv->tx_skbuff = NULL;
859 }
860 
861 /**
862  * xgmac_tx_complete:
863  * @priv: private driver structure
864  * Description: it reclaims resources after transmission completes.
865  */
866 static void xgmac_tx_complete(struct xgmac_priv *priv)
867 {
868 	while (dma_ring_cnt(priv->tx_head, priv->tx_tail, DMA_TX_RING_SZ)) {
869 		unsigned int entry = priv->tx_tail;
870 		struct sk_buff *skb = priv->tx_skbuff[entry];
871 		struct xgmac_dma_desc *p = priv->dma_tx + entry;
872 
873 		/* Check if the descriptor is owned by the DMA. */
874 		if (desc_get_owner(p))
875 			break;
876 
877 		netdev_dbg(priv->dev, "tx ring: curr %d, dirty %d\n",
878 			priv->tx_head, priv->tx_tail);
879 
880 		if (desc_get_tx_fs(p))
881 			dma_unmap_single(priv->device, desc_get_buf_addr(p),
882 					 desc_get_buf_len(p), DMA_TO_DEVICE);
883 		else
884 			dma_unmap_page(priv->device, desc_get_buf_addr(p),
885 				       desc_get_buf_len(p), DMA_TO_DEVICE);
886 
887 		/* Check tx error on the last segment */
888 		if (desc_get_tx_ls(p)) {
889 			desc_get_tx_status(priv, p);
890 			dev_consume_skb_any(skb);
891 		}
892 
893 		priv->tx_skbuff[entry] = NULL;
894 		priv->tx_tail = dma_ring_incr(entry, DMA_TX_RING_SZ);
895 	}
896 
897 	/* Ensure tx_tail is visible to xgmac_xmit */
898 	smp_mb();
899 	if (unlikely(netif_queue_stopped(priv->dev) &&
900 	    (tx_dma_ring_space(priv) > MAX_SKB_FRAGS)))
901 		netif_wake_queue(priv->dev);
902 }
903 
904 static void xgmac_tx_timeout_work(struct work_struct *work)
905 {
906 	u32 reg, value;
907 	struct xgmac_priv *priv =
908 		container_of(work, struct xgmac_priv, tx_timeout_work);
909 
910 	napi_disable(&priv->napi);
911 
912 	writel(0, priv->base + XGMAC_DMA_INTR_ENA);
913 
914 	netif_tx_lock(priv->dev);
915 
916 	reg = readl(priv->base + XGMAC_DMA_CONTROL);
917 	writel(reg & ~DMA_CONTROL_ST, priv->base + XGMAC_DMA_CONTROL);
918 	do {
919 		value = readl(priv->base + XGMAC_DMA_STATUS) & 0x700000;
920 	} while (value && (value != 0x600000));
921 
922 	xgmac_free_tx_skbufs(priv);
923 	desc_init_tx_desc(priv->dma_tx, DMA_TX_RING_SZ);
924 	priv->tx_tail = 0;
925 	priv->tx_head = 0;
926 	writel(priv->dma_tx_phy, priv->base + XGMAC_DMA_TX_BASE_ADDR);
927 	writel(reg | DMA_CONTROL_ST, priv->base + XGMAC_DMA_CONTROL);
928 
929 	writel(DMA_STATUS_TU | DMA_STATUS_TPS | DMA_STATUS_NIS | DMA_STATUS_AIS,
930 		priv->base + XGMAC_DMA_STATUS);
931 
932 	netif_tx_unlock(priv->dev);
933 	netif_wake_queue(priv->dev);
934 
935 	napi_enable(&priv->napi);
936 
937 	/* Enable interrupts */
938 	writel(DMA_INTR_DEFAULT_MASK, priv->base + XGMAC_DMA_STATUS);
939 	writel(DMA_INTR_DEFAULT_MASK, priv->base + XGMAC_DMA_INTR_ENA);
940 }
941 
942 static int xgmac_hw_init(struct net_device *dev)
943 {
944 	u32 value, ctrl;
945 	int limit;
946 	struct xgmac_priv *priv = netdev_priv(dev);
947 	void __iomem *ioaddr = priv->base;
948 
949 	/* Save the ctrl register value */
950 	ctrl = readl(ioaddr + XGMAC_CONTROL) & XGMAC_CONTROL_SPD_MASK;
951 
952 	/* SW reset */
953 	value = DMA_BUS_MODE_SFT_RESET;
954 	writel(value, ioaddr + XGMAC_DMA_BUS_MODE);
955 	limit = 15000;
956 	while (limit-- &&
957 		(readl(ioaddr + XGMAC_DMA_BUS_MODE) & DMA_BUS_MODE_SFT_RESET))
958 		cpu_relax();
959 	if (limit < 0)
960 		return -EBUSY;
961 
962 	value = (0x10 << DMA_BUS_MODE_PBL_SHIFT) |
963 		(0x10 << DMA_BUS_MODE_RPBL_SHIFT) |
964 		DMA_BUS_MODE_FB | DMA_BUS_MODE_ATDS | DMA_BUS_MODE_AAL;
965 	writel(value, ioaddr + XGMAC_DMA_BUS_MODE);
966 
967 	writel(0, ioaddr + XGMAC_DMA_INTR_ENA);
968 
969 	/* Mask power mgt interrupt */
970 	writel(XGMAC_INT_STAT_PMTIM, ioaddr + XGMAC_INT_STAT);
971 
972 	/* XGMAC requires AXI bus init. This is a 'magic number' for now */
973 	writel(0x0077000E, ioaddr + XGMAC_DMA_AXI_BUS);
974 
975 	ctrl |= XGMAC_CONTROL_DDIC | XGMAC_CONTROL_JE | XGMAC_CONTROL_ACS |
976 		XGMAC_CONTROL_CAR;
977 	if (dev->features & NETIF_F_RXCSUM)
978 		ctrl |= XGMAC_CONTROL_IPC;
979 	writel(ctrl, ioaddr + XGMAC_CONTROL);
980 
981 	writel(DMA_CONTROL_OSF, ioaddr + XGMAC_DMA_CONTROL);
982 
983 	/* Set the HW DMA mode and the COE */
984 	writel(XGMAC_OMR_TSF | XGMAC_OMR_RFD | XGMAC_OMR_RFA |
985 		XGMAC_OMR_RTC_256,
986 		ioaddr + XGMAC_OMR);
987 
988 	/* Reset the MMC counters */
989 	writel(1, ioaddr + XGMAC_MMC_CTRL);
990 	return 0;
991 }
992 
993 /**
994  *  xgmac_open - open entry point of the driver
995  *  @dev : pointer to the device structure.
996  *  Description:
997  *  This function is the open entry point of the driver.
998  *  Return value:
999  *  0 on success and an appropriate (-)ve integer as defined in errno.h
1000  *  file on failure.
1001  */
1002 static int xgmac_open(struct net_device *dev)
1003 {
1004 	int ret;
1005 	struct xgmac_priv *priv = netdev_priv(dev);
1006 	void __iomem *ioaddr = priv->base;
1007 
1008 	/* Check that the MAC address is valid.  If its not, refuse
1009 	 * to bring the device up. The user must specify an
1010 	 * address using the following linux command:
1011 	 *      ifconfig eth0 hw ether xx:xx:xx:xx:xx:xx  */
1012 	if (!is_valid_ether_addr(dev->dev_addr)) {
1013 		eth_hw_addr_random(dev);
1014 		netdev_dbg(priv->dev, "generated random MAC address %pM\n",
1015 			dev->dev_addr);
1016 	}
1017 
1018 	memset(&priv->xstats, 0, sizeof(struct xgmac_extra_stats));
1019 
1020 	/* Initialize the XGMAC and descriptors */
1021 	xgmac_hw_init(dev);
1022 	xgmac_set_mac_addr(ioaddr, dev->dev_addr, 0);
1023 	xgmac_set_flow_ctrl(priv, priv->rx_pause, priv->tx_pause);
1024 
1025 	ret = xgmac_dma_desc_rings_init(dev);
1026 	if (ret < 0)
1027 		return ret;
1028 
1029 	/* Enable the MAC Rx/Tx */
1030 	xgmac_mac_enable(ioaddr);
1031 
1032 	napi_enable(&priv->napi);
1033 	netif_start_queue(dev);
1034 
1035 	/* Enable interrupts */
1036 	writel(DMA_INTR_DEFAULT_MASK, ioaddr + XGMAC_DMA_STATUS);
1037 	writel(DMA_INTR_DEFAULT_MASK, ioaddr + XGMAC_DMA_INTR_ENA);
1038 
1039 	return 0;
1040 }
1041 
1042 /**
1043  *  xgmac_stop - close entry point of the driver
1044  *  @dev : device pointer.
1045  *  Description:
1046  *  This is the stop entry point of the driver.
1047  */
1048 static int xgmac_stop(struct net_device *dev)
1049 {
1050 	struct xgmac_priv *priv = netdev_priv(dev);
1051 
1052 	if (readl(priv->base + XGMAC_DMA_INTR_ENA))
1053 		napi_disable(&priv->napi);
1054 
1055 	writel(0, priv->base + XGMAC_DMA_INTR_ENA);
1056 
1057 	netif_tx_disable(dev);
1058 
1059 	/* Disable the MAC core */
1060 	xgmac_mac_disable(priv->base);
1061 
1062 	/* Release and free the Rx/Tx resources */
1063 	xgmac_free_dma_desc_rings(priv);
1064 
1065 	return 0;
1066 }
1067 
1068 /**
1069  *  xgmac_xmit:
1070  *  @skb : the socket buffer
1071  *  @dev : device pointer
1072  *  Description : Tx entry point of the driver.
1073  */
1074 static netdev_tx_t xgmac_xmit(struct sk_buff *skb, struct net_device *dev)
1075 {
1076 	struct xgmac_priv *priv = netdev_priv(dev);
1077 	unsigned int entry;
1078 	int i;
1079 	u32 irq_flag;
1080 	int nfrags = skb_shinfo(skb)->nr_frags;
1081 	struct xgmac_dma_desc *desc, *first;
1082 	unsigned int desc_flags;
1083 	unsigned int len;
1084 	dma_addr_t paddr;
1085 
1086 	priv->tx_irq_cnt = (priv->tx_irq_cnt + 1) & (DMA_TX_RING_SZ/4 - 1);
1087 	irq_flag = priv->tx_irq_cnt ? 0 : TXDESC_INTERRUPT;
1088 
1089 	desc_flags = (skb->ip_summed == CHECKSUM_PARTIAL) ?
1090 		TXDESC_CSUM_ALL : 0;
1091 	entry = priv->tx_head;
1092 	desc = priv->dma_tx + entry;
1093 	first = desc;
1094 
1095 	len = skb_headlen(skb);
1096 	paddr = dma_map_single(priv->device, skb->data, len, DMA_TO_DEVICE);
1097 	if (dma_mapping_error(priv->device, paddr)) {
1098 		dev_kfree_skb_any(skb);
1099 		return NETDEV_TX_OK;
1100 	}
1101 	priv->tx_skbuff[entry] = skb;
1102 	desc_set_buf_addr_and_size(desc, paddr, len);
1103 
1104 	for (i = 0; i < nfrags; i++) {
1105 		skb_frag_t *frag = &skb_shinfo(skb)->frags[i];
1106 
1107 		len = skb_frag_size(frag);
1108 
1109 		paddr = skb_frag_dma_map(priv->device, frag, 0, len,
1110 					 DMA_TO_DEVICE);
1111 		if (dma_mapping_error(priv->device, paddr))
1112 			goto dma_err;
1113 
1114 		entry = dma_ring_incr(entry, DMA_TX_RING_SZ);
1115 		desc = priv->dma_tx + entry;
1116 		priv->tx_skbuff[entry] = skb;
1117 
1118 		desc_set_buf_addr_and_size(desc, paddr, len);
1119 		if (i < (nfrags - 1))
1120 			desc_set_tx_owner(desc, desc_flags);
1121 	}
1122 
1123 	/* Interrupt on completition only for the latest segment */
1124 	if (desc != first)
1125 		desc_set_tx_owner(desc, desc_flags |
1126 			TXDESC_LAST_SEG | irq_flag);
1127 	else
1128 		desc_flags |= TXDESC_LAST_SEG | irq_flag;
1129 
1130 	/* Set owner on first desc last to avoid race condition */
1131 	wmb();
1132 	desc_set_tx_owner(first, desc_flags | TXDESC_FIRST_SEG);
1133 
1134 	writel(1, priv->base + XGMAC_DMA_TX_POLL);
1135 
1136 	priv->tx_head = dma_ring_incr(entry, DMA_TX_RING_SZ);
1137 
1138 	/* Ensure tx_head update is visible to tx completion */
1139 	smp_mb();
1140 	if (unlikely(tx_dma_ring_space(priv) <= MAX_SKB_FRAGS)) {
1141 		netif_stop_queue(dev);
1142 		/* Ensure netif_stop_queue is visible to tx completion */
1143 		smp_mb();
1144 		if (tx_dma_ring_space(priv) > MAX_SKB_FRAGS)
1145 			netif_start_queue(dev);
1146 	}
1147 	return NETDEV_TX_OK;
1148 
1149 dma_err:
1150 	entry = priv->tx_head;
1151 	for ( ; i > 0; i--) {
1152 		entry = dma_ring_incr(entry, DMA_TX_RING_SZ);
1153 		desc = priv->dma_tx + entry;
1154 		priv->tx_skbuff[entry] = NULL;
1155 		dma_unmap_page(priv->device, desc_get_buf_addr(desc),
1156 			       desc_get_buf_len(desc), DMA_TO_DEVICE);
1157 		desc_clear_tx_owner(desc);
1158 	}
1159 	desc = first;
1160 	dma_unmap_single(priv->device, desc_get_buf_addr(desc),
1161 			 desc_get_buf_len(desc), DMA_TO_DEVICE);
1162 	dev_kfree_skb_any(skb);
1163 	return NETDEV_TX_OK;
1164 }
1165 
1166 static int xgmac_rx(struct xgmac_priv *priv, int limit)
1167 {
1168 	unsigned int entry;
1169 	unsigned int count = 0;
1170 	struct xgmac_dma_desc *p;
1171 
1172 	while (count < limit) {
1173 		int ip_checksum;
1174 		struct sk_buff *skb;
1175 		int frame_len;
1176 
1177 		if (!dma_ring_cnt(priv->rx_head, priv->rx_tail, DMA_RX_RING_SZ))
1178 			break;
1179 
1180 		entry = priv->rx_tail;
1181 		p = priv->dma_rx + entry;
1182 		if (desc_get_owner(p))
1183 			break;
1184 
1185 		count++;
1186 		priv->rx_tail = dma_ring_incr(priv->rx_tail, DMA_RX_RING_SZ);
1187 
1188 		/* read the status of the incoming frame */
1189 		ip_checksum = desc_get_rx_status(priv, p);
1190 		if (ip_checksum < 0)
1191 			continue;
1192 
1193 		skb = priv->rx_skbuff[entry];
1194 		if (unlikely(!skb)) {
1195 			netdev_err(priv->dev, "Inconsistent Rx descriptor chain\n");
1196 			break;
1197 		}
1198 		priv->rx_skbuff[entry] = NULL;
1199 
1200 		frame_len = desc_get_rx_frame_len(p);
1201 		netdev_dbg(priv->dev, "RX frame size %d, COE status: %d\n",
1202 			frame_len, ip_checksum);
1203 
1204 		skb_put(skb, frame_len);
1205 		dma_unmap_single(priv->device, desc_get_buf_addr(p),
1206 				 priv->dma_buf_sz - NET_IP_ALIGN, DMA_FROM_DEVICE);
1207 
1208 		skb->protocol = eth_type_trans(skb, priv->dev);
1209 		skb->ip_summed = ip_checksum;
1210 		if (ip_checksum == CHECKSUM_NONE)
1211 			netif_receive_skb(skb);
1212 		else
1213 			napi_gro_receive(&priv->napi, skb);
1214 	}
1215 
1216 	xgmac_rx_refill(priv);
1217 
1218 	return count;
1219 }
1220 
1221 /**
1222  *  xgmac_poll - xgmac poll method (NAPI)
1223  *  @napi : pointer to the napi structure.
1224  *  @budget : maximum number of packets that the current CPU can receive from
1225  *	      all interfaces.
1226  *  Description :
1227  *   This function implements the reception process.
1228  *   Also it runs the TX completion thread
1229  */
1230 static int xgmac_poll(struct napi_struct *napi, int budget)
1231 {
1232 	struct xgmac_priv *priv = container_of(napi,
1233 				       struct xgmac_priv, napi);
1234 	int work_done = 0;
1235 
1236 	xgmac_tx_complete(priv);
1237 	work_done = xgmac_rx(priv, budget);
1238 
1239 	if (work_done < budget) {
1240 		napi_complete_done(napi, work_done);
1241 		__raw_writel(DMA_INTR_DEFAULT_MASK, priv->base + XGMAC_DMA_INTR_ENA);
1242 	}
1243 	return work_done;
1244 }
1245 
1246 /**
1247  *  xgmac_tx_timeout
1248  *  @dev : Pointer to net device structure
1249  *  @txqueue: index of the hung transmit queue
1250  *
1251  *  Description: this function is called when a packet transmission fails to
1252  *   complete within a reasonable tmrate. The driver will mark the error in the
1253  *   netdev structure and arrange for the device to be reset to a sane state
1254  *   in order to transmit a new packet.
1255  */
1256 static void xgmac_tx_timeout(struct net_device *dev, unsigned int txqueue)
1257 {
1258 	struct xgmac_priv *priv = netdev_priv(dev);
1259 	schedule_work(&priv->tx_timeout_work);
1260 }
1261 
1262 /**
1263  *  xgmac_set_rx_mode - entry point for multicast addressing
1264  *  @dev : pointer to the device structure
1265  *  Description:
1266  *  This function is a driver entry point which gets called by the kernel
1267  *  whenever multicast addresses must be enabled/disabled.
1268  *  Return value:
1269  *  void.
1270  */
1271 static void xgmac_set_rx_mode(struct net_device *dev)
1272 {
1273 	int i;
1274 	struct xgmac_priv *priv = netdev_priv(dev);
1275 	void __iomem *ioaddr = priv->base;
1276 	unsigned int value = 0;
1277 	u32 hash_filter[XGMAC_NUM_HASH];
1278 	int reg = 1;
1279 	struct netdev_hw_addr *ha;
1280 	bool use_hash = false;
1281 
1282 	netdev_dbg(priv->dev, "# mcasts %d, # unicast %d\n",
1283 		 netdev_mc_count(dev), netdev_uc_count(dev));
1284 
1285 	if (dev->flags & IFF_PROMISC)
1286 		value |= XGMAC_FRAME_FILTER_PR;
1287 
1288 	memset(hash_filter, 0, sizeof(hash_filter));
1289 
1290 	if (netdev_uc_count(dev) > priv->max_macs) {
1291 		use_hash = true;
1292 		value |= XGMAC_FRAME_FILTER_HUC | XGMAC_FRAME_FILTER_HPF;
1293 	}
1294 	netdev_for_each_uc_addr(ha, dev) {
1295 		if (use_hash) {
1296 			u32 bit_nr = ~ether_crc(ETH_ALEN, ha->addr) >> 23;
1297 
1298 			/* The most significant 4 bits determine the register to
1299 			 * use (H/L) while the other 5 bits determine the bit
1300 			 * within the register. */
1301 			hash_filter[bit_nr >> 5] |= 1 << (bit_nr & 31);
1302 		} else {
1303 			xgmac_set_mac_addr(ioaddr, ha->addr, reg);
1304 			reg++;
1305 		}
1306 	}
1307 
1308 	if (dev->flags & IFF_ALLMULTI) {
1309 		value |= XGMAC_FRAME_FILTER_PM;
1310 		goto out;
1311 	}
1312 
1313 	if ((netdev_mc_count(dev) + reg - 1) > priv->max_macs) {
1314 		use_hash = true;
1315 		value |= XGMAC_FRAME_FILTER_HMC | XGMAC_FRAME_FILTER_HPF;
1316 	} else {
1317 		use_hash = false;
1318 	}
1319 	netdev_for_each_mc_addr(ha, dev) {
1320 		if (use_hash) {
1321 			u32 bit_nr = ~ether_crc(ETH_ALEN, ha->addr) >> 23;
1322 
1323 			/* The most significant 4 bits determine the register to
1324 			 * use (H/L) while the other 5 bits determine the bit
1325 			 * within the register. */
1326 			hash_filter[bit_nr >> 5] |= 1 << (bit_nr & 31);
1327 		} else {
1328 			xgmac_set_mac_addr(ioaddr, ha->addr, reg);
1329 			reg++;
1330 		}
1331 	}
1332 
1333 out:
1334 	for (i = reg; i <= priv->max_macs; i++)
1335 		xgmac_set_mac_addr(ioaddr, NULL, i);
1336 	for (i = 0; i < XGMAC_NUM_HASH; i++)
1337 		writel(hash_filter[i], ioaddr + XGMAC_HASH(i));
1338 
1339 	writel(value, ioaddr + XGMAC_FRAME_FILTER);
1340 }
1341 
1342 /**
1343  *  xgmac_change_mtu - entry point to change MTU size for the device.
1344  *  @dev : device pointer.
1345  *  @new_mtu : the new MTU size for the device.
1346  *  Description: the Maximum Transfer Unit (MTU) is used by the network layer
1347  *  to drive packet transmission. Ethernet has an MTU of 1500 octets
1348  *  (ETH_DATA_LEN). This value can be changed with ifconfig.
1349  *  Return value:
1350  *  0 on success and an appropriate (-)ve integer as defined in errno.h
1351  *  file on failure.
1352  */
1353 static int xgmac_change_mtu(struct net_device *dev, int new_mtu)
1354 {
1355 	/* Stop everything, get ready to change the MTU */
1356 	if (!netif_running(dev))
1357 		return 0;
1358 
1359 	/* Bring interface down, change mtu and bring interface back up */
1360 	xgmac_stop(dev);
1361 	dev->mtu = new_mtu;
1362 	return xgmac_open(dev);
1363 }
1364 
1365 static irqreturn_t xgmac_pmt_interrupt(int irq, void *dev_id)
1366 {
1367 	u32 intr_status;
1368 	struct net_device *dev = (struct net_device *)dev_id;
1369 	struct xgmac_priv *priv = netdev_priv(dev);
1370 	void __iomem *ioaddr = priv->base;
1371 
1372 	intr_status = __raw_readl(ioaddr + XGMAC_INT_STAT);
1373 	if (intr_status & XGMAC_INT_STAT_PMT) {
1374 		netdev_dbg(priv->dev, "received Magic frame\n");
1375 		/* clear the PMT bits 5 and 6 by reading the PMT */
1376 		readl(ioaddr + XGMAC_PMT);
1377 	}
1378 	return IRQ_HANDLED;
1379 }
1380 
1381 static irqreturn_t xgmac_interrupt(int irq, void *dev_id)
1382 {
1383 	u32 intr_status;
1384 	struct net_device *dev = (struct net_device *)dev_id;
1385 	struct xgmac_priv *priv = netdev_priv(dev);
1386 	struct xgmac_extra_stats *x = &priv->xstats;
1387 
1388 	/* read the status register (CSR5) */
1389 	intr_status = __raw_readl(priv->base + XGMAC_DMA_STATUS);
1390 	intr_status &= __raw_readl(priv->base + XGMAC_DMA_INTR_ENA);
1391 	__raw_writel(intr_status, priv->base + XGMAC_DMA_STATUS);
1392 
1393 	/* It displays the DMA process states (CSR5 register) */
1394 	/* ABNORMAL interrupts */
1395 	if (unlikely(intr_status & DMA_STATUS_AIS)) {
1396 		if (intr_status & DMA_STATUS_TJT) {
1397 			netdev_err(priv->dev, "transmit jabber\n");
1398 			x->tx_jabber++;
1399 		}
1400 		if (intr_status & DMA_STATUS_RU)
1401 			x->rx_buf_unav++;
1402 		if (intr_status & DMA_STATUS_RPS) {
1403 			netdev_err(priv->dev, "receive process stopped\n");
1404 			x->rx_process_stopped++;
1405 		}
1406 		if (intr_status & DMA_STATUS_ETI) {
1407 			netdev_err(priv->dev, "transmit early interrupt\n");
1408 			x->tx_early++;
1409 		}
1410 		if (intr_status & DMA_STATUS_TPS) {
1411 			netdev_err(priv->dev, "transmit process stopped\n");
1412 			x->tx_process_stopped++;
1413 			schedule_work(&priv->tx_timeout_work);
1414 		}
1415 		if (intr_status & DMA_STATUS_FBI) {
1416 			netdev_err(priv->dev, "fatal bus error\n");
1417 			x->fatal_bus_error++;
1418 		}
1419 	}
1420 
1421 	/* TX/RX NORMAL interrupts */
1422 	if (intr_status & (DMA_STATUS_RI | DMA_STATUS_TU | DMA_STATUS_TI)) {
1423 		__raw_writel(DMA_INTR_ABNORMAL, priv->base + XGMAC_DMA_INTR_ENA);
1424 		napi_schedule(&priv->napi);
1425 	}
1426 
1427 	return IRQ_HANDLED;
1428 }
1429 
1430 #ifdef CONFIG_NET_POLL_CONTROLLER
1431 /* Polling receive - used by NETCONSOLE and other diagnostic tools
1432  * to allow network I/O with interrupts disabled. */
1433 static void xgmac_poll_controller(struct net_device *dev)
1434 {
1435 	disable_irq(dev->irq);
1436 	xgmac_interrupt(dev->irq, dev);
1437 	enable_irq(dev->irq);
1438 }
1439 #endif
1440 
1441 static void
1442 xgmac_get_stats64(struct net_device *dev,
1443 		  struct rtnl_link_stats64 *storage)
1444 {
1445 	struct xgmac_priv *priv = netdev_priv(dev);
1446 	void __iomem *base = priv->base;
1447 	u32 count;
1448 
1449 	spin_lock_bh(&priv->stats_lock);
1450 	writel(XGMAC_MMC_CTRL_CNT_FRZ, base + XGMAC_MMC_CTRL);
1451 
1452 	storage->rx_bytes = readl(base + XGMAC_MMC_RXOCTET_G_LO);
1453 	storage->rx_bytes |= (u64)(readl(base + XGMAC_MMC_RXOCTET_G_HI)) << 32;
1454 
1455 	storage->rx_packets = readl(base + XGMAC_MMC_RXFRAME_GB_LO);
1456 	storage->multicast = readl(base + XGMAC_MMC_RXMCFRAME_G);
1457 	storage->rx_crc_errors = readl(base + XGMAC_MMC_RXCRCERR);
1458 	storage->rx_length_errors = readl(base + XGMAC_MMC_RXLENGTHERR);
1459 	storage->rx_missed_errors = readl(base + XGMAC_MMC_RXOVERFLOW);
1460 
1461 	storage->tx_bytes = readl(base + XGMAC_MMC_TXOCTET_G_LO);
1462 	storage->tx_bytes |= (u64)(readl(base + XGMAC_MMC_TXOCTET_G_HI)) << 32;
1463 
1464 	count = readl(base + XGMAC_MMC_TXFRAME_GB_LO);
1465 	storage->tx_errors = count - readl(base + XGMAC_MMC_TXFRAME_G_LO);
1466 	storage->tx_packets = count;
1467 	storage->tx_fifo_errors = readl(base + XGMAC_MMC_TXUNDERFLOW);
1468 
1469 	writel(0, base + XGMAC_MMC_CTRL);
1470 	spin_unlock_bh(&priv->stats_lock);
1471 }
1472 
1473 static int xgmac_set_mac_address(struct net_device *dev, void *p)
1474 {
1475 	struct xgmac_priv *priv = netdev_priv(dev);
1476 	void __iomem *ioaddr = priv->base;
1477 	struct sockaddr *addr = p;
1478 
1479 	if (!is_valid_ether_addr(addr->sa_data))
1480 		return -EADDRNOTAVAIL;
1481 
1482 	eth_hw_addr_set(dev, addr->sa_data);
1483 
1484 	xgmac_set_mac_addr(ioaddr, dev->dev_addr, 0);
1485 
1486 	return 0;
1487 }
1488 
1489 static int xgmac_set_features(struct net_device *dev, netdev_features_t features)
1490 {
1491 	u32 ctrl;
1492 	struct xgmac_priv *priv = netdev_priv(dev);
1493 	void __iomem *ioaddr = priv->base;
1494 	netdev_features_t changed = dev->features ^ features;
1495 
1496 	if (!(changed & NETIF_F_RXCSUM))
1497 		return 0;
1498 
1499 	ctrl = readl(ioaddr + XGMAC_CONTROL);
1500 	if (features & NETIF_F_RXCSUM)
1501 		ctrl |= XGMAC_CONTROL_IPC;
1502 	else
1503 		ctrl &= ~XGMAC_CONTROL_IPC;
1504 	writel(ctrl, ioaddr + XGMAC_CONTROL);
1505 
1506 	return 0;
1507 }
1508 
1509 static const struct net_device_ops xgmac_netdev_ops = {
1510 	.ndo_open = xgmac_open,
1511 	.ndo_start_xmit = xgmac_xmit,
1512 	.ndo_stop = xgmac_stop,
1513 	.ndo_change_mtu = xgmac_change_mtu,
1514 	.ndo_set_rx_mode = xgmac_set_rx_mode,
1515 	.ndo_tx_timeout = xgmac_tx_timeout,
1516 	.ndo_get_stats64 = xgmac_get_stats64,
1517 #ifdef CONFIG_NET_POLL_CONTROLLER
1518 	.ndo_poll_controller = xgmac_poll_controller,
1519 #endif
1520 	.ndo_set_mac_address = xgmac_set_mac_address,
1521 	.ndo_set_features = xgmac_set_features,
1522 };
1523 
1524 static int xgmac_ethtool_get_link_ksettings(struct net_device *dev,
1525 					    struct ethtool_link_ksettings *cmd)
1526 {
1527 	cmd->base.autoneg = 0;
1528 	cmd->base.duplex = DUPLEX_FULL;
1529 	cmd->base.speed = 10000;
1530 	ethtool_convert_legacy_u32_to_link_mode(cmd->link_modes.supported, 0);
1531 	ethtool_convert_legacy_u32_to_link_mode(cmd->link_modes.advertising, 0);
1532 	return 0;
1533 }
1534 
1535 static void xgmac_get_pauseparam(struct net_device *netdev,
1536 				      struct ethtool_pauseparam *pause)
1537 {
1538 	struct xgmac_priv *priv = netdev_priv(netdev);
1539 
1540 	pause->rx_pause = priv->rx_pause;
1541 	pause->tx_pause = priv->tx_pause;
1542 }
1543 
1544 static int xgmac_set_pauseparam(struct net_device *netdev,
1545 				     struct ethtool_pauseparam *pause)
1546 {
1547 	struct xgmac_priv *priv = netdev_priv(netdev);
1548 
1549 	if (pause->autoneg)
1550 		return -EINVAL;
1551 
1552 	return xgmac_set_flow_ctrl(priv, pause->rx_pause, pause->tx_pause);
1553 }
1554 
1555 struct xgmac_stats {
1556 	char stat_string[ETH_GSTRING_LEN];
1557 	int stat_offset;
1558 	bool is_reg;
1559 };
1560 
1561 #define XGMAC_STAT(m)	\
1562 	{ #m, offsetof(struct xgmac_priv, xstats.m), false }
1563 #define XGMAC_HW_STAT(m, reg_offset)	\
1564 	{ #m, reg_offset, true }
1565 
1566 static const struct xgmac_stats xgmac_gstrings_stats[] = {
1567 	XGMAC_STAT(tx_frame_flushed),
1568 	XGMAC_STAT(tx_payload_error),
1569 	XGMAC_STAT(tx_ip_header_error),
1570 	XGMAC_STAT(tx_local_fault),
1571 	XGMAC_STAT(tx_remote_fault),
1572 	XGMAC_STAT(tx_early),
1573 	XGMAC_STAT(tx_process_stopped),
1574 	XGMAC_STAT(tx_jabber),
1575 	XGMAC_STAT(rx_buf_unav),
1576 	XGMAC_STAT(rx_process_stopped),
1577 	XGMAC_STAT(rx_payload_error),
1578 	XGMAC_STAT(rx_ip_header_error),
1579 	XGMAC_STAT(rx_da_filter_fail),
1580 	XGMAC_STAT(fatal_bus_error),
1581 	XGMAC_HW_STAT(rx_watchdog, XGMAC_MMC_RXWATCHDOG),
1582 	XGMAC_HW_STAT(tx_vlan, XGMAC_MMC_TXVLANFRAME),
1583 	XGMAC_HW_STAT(rx_vlan, XGMAC_MMC_RXVLANFRAME),
1584 	XGMAC_HW_STAT(tx_pause, XGMAC_MMC_TXPAUSEFRAME),
1585 	XGMAC_HW_STAT(rx_pause, XGMAC_MMC_RXPAUSEFRAME),
1586 };
1587 #define XGMAC_STATS_LEN ARRAY_SIZE(xgmac_gstrings_stats)
1588 
1589 static void xgmac_get_ethtool_stats(struct net_device *dev,
1590 					 struct ethtool_stats *dummy,
1591 					 u64 *data)
1592 {
1593 	struct xgmac_priv *priv = netdev_priv(dev);
1594 	void *p = priv;
1595 	int i;
1596 
1597 	for (i = 0; i < XGMAC_STATS_LEN; i++) {
1598 		if (xgmac_gstrings_stats[i].is_reg)
1599 			*data++ = readl(priv->base +
1600 				xgmac_gstrings_stats[i].stat_offset);
1601 		else
1602 			*data++ = *(u32 *)(p +
1603 				xgmac_gstrings_stats[i].stat_offset);
1604 	}
1605 }
1606 
1607 static int xgmac_get_sset_count(struct net_device *netdev, int sset)
1608 {
1609 	switch (sset) {
1610 	case ETH_SS_STATS:
1611 		return XGMAC_STATS_LEN;
1612 	default:
1613 		return -EINVAL;
1614 	}
1615 }
1616 
1617 static void xgmac_get_strings(struct net_device *dev, u32 stringset,
1618 				   u8 *data)
1619 {
1620 	int i;
1621 	u8 *p = data;
1622 
1623 	switch (stringset) {
1624 	case ETH_SS_STATS:
1625 		for (i = 0; i < XGMAC_STATS_LEN; i++) {
1626 			memcpy(p, xgmac_gstrings_stats[i].stat_string,
1627 			       ETH_GSTRING_LEN);
1628 			p += ETH_GSTRING_LEN;
1629 		}
1630 		break;
1631 	default:
1632 		WARN_ON(1);
1633 		break;
1634 	}
1635 }
1636 
1637 static void xgmac_get_wol(struct net_device *dev,
1638 			       struct ethtool_wolinfo *wol)
1639 {
1640 	struct xgmac_priv *priv = netdev_priv(dev);
1641 
1642 	if (device_can_wakeup(priv->device)) {
1643 		wol->supported = WAKE_MAGIC | WAKE_UCAST;
1644 		wol->wolopts = priv->wolopts;
1645 	}
1646 }
1647 
1648 static int xgmac_set_wol(struct net_device *dev,
1649 			      struct ethtool_wolinfo *wol)
1650 {
1651 	struct xgmac_priv *priv = netdev_priv(dev);
1652 	u32 support = WAKE_MAGIC | WAKE_UCAST;
1653 
1654 	if (!device_can_wakeup(priv->device))
1655 		return -ENOTSUPP;
1656 
1657 	if (wol->wolopts & ~support)
1658 		return -EINVAL;
1659 
1660 	priv->wolopts = wol->wolopts;
1661 
1662 	if (wol->wolopts) {
1663 		device_set_wakeup_enable(priv->device, 1);
1664 		enable_irq_wake(dev->irq);
1665 	} else {
1666 		device_set_wakeup_enable(priv->device, 0);
1667 		disable_irq_wake(dev->irq);
1668 	}
1669 
1670 	return 0;
1671 }
1672 
1673 static const struct ethtool_ops xgmac_ethtool_ops = {
1674 	.get_link = ethtool_op_get_link,
1675 	.get_pauseparam = xgmac_get_pauseparam,
1676 	.set_pauseparam = xgmac_set_pauseparam,
1677 	.get_ethtool_stats = xgmac_get_ethtool_stats,
1678 	.get_strings = xgmac_get_strings,
1679 	.get_wol = xgmac_get_wol,
1680 	.set_wol = xgmac_set_wol,
1681 	.get_sset_count = xgmac_get_sset_count,
1682 	.get_link_ksettings = xgmac_ethtool_get_link_ksettings,
1683 };
1684 
1685 /**
1686  * xgmac_probe
1687  * @pdev: platform device pointer
1688  * Description: the driver is initialized through platform_device.
1689  */
1690 static int xgmac_probe(struct platform_device *pdev)
1691 {
1692 	int ret = 0;
1693 	struct resource *res;
1694 	struct net_device *ndev = NULL;
1695 	struct xgmac_priv *priv = NULL;
1696 	u8 addr[ETH_ALEN];
1697 	u32 uid;
1698 
1699 	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
1700 	if (!res)
1701 		return -ENODEV;
1702 
1703 	if (!request_mem_region(res->start, resource_size(res), pdev->name))
1704 		return -EBUSY;
1705 
1706 	ndev = alloc_etherdev(sizeof(struct xgmac_priv));
1707 	if (!ndev) {
1708 		ret = -ENOMEM;
1709 		goto err_alloc;
1710 	}
1711 
1712 	SET_NETDEV_DEV(ndev, &pdev->dev);
1713 	priv = netdev_priv(ndev);
1714 	platform_set_drvdata(pdev, ndev);
1715 	ndev->netdev_ops = &xgmac_netdev_ops;
1716 	ndev->ethtool_ops = &xgmac_ethtool_ops;
1717 	spin_lock_init(&priv->stats_lock);
1718 	INIT_WORK(&priv->tx_timeout_work, xgmac_tx_timeout_work);
1719 
1720 	priv->device = &pdev->dev;
1721 	priv->dev = ndev;
1722 	priv->rx_pause = 1;
1723 	priv->tx_pause = 1;
1724 
1725 	priv->base = ioremap(res->start, resource_size(res));
1726 	if (!priv->base) {
1727 		netdev_err(ndev, "ioremap failed\n");
1728 		ret = -ENOMEM;
1729 		goto err_io;
1730 	}
1731 
1732 	uid = readl(priv->base + XGMAC_VERSION);
1733 	netdev_info(ndev, "h/w version is 0x%x\n", uid);
1734 
1735 	/* Figure out how many valid mac address filter registers we have */
1736 	writel(1, priv->base + XGMAC_ADDR_HIGH(31));
1737 	if (readl(priv->base + XGMAC_ADDR_HIGH(31)) == 1)
1738 		priv->max_macs = 31;
1739 	else
1740 		priv->max_macs = 7;
1741 
1742 	writel(0, priv->base + XGMAC_DMA_INTR_ENA);
1743 	ndev->irq = platform_get_irq(pdev, 0);
1744 	if (ndev->irq == -ENXIO) {
1745 		netdev_err(ndev, "No irq resource\n");
1746 		ret = ndev->irq;
1747 		goto err_irq;
1748 	}
1749 
1750 	ret = request_irq(ndev->irq, xgmac_interrupt, 0,
1751 			  dev_name(&pdev->dev), ndev);
1752 	if (ret < 0) {
1753 		netdev_err(ndev, "Could not request irq %d - ret %d)\n",
1754 			ndev->irq, ret);
1755 		goto err_irq;
1756 	}
1757 
1758 	priv->pmt_irq = platform_get_irq(pdev, 1);
1759 	if (priv->pmt_irq == -ENXIO) {
1760 		netdev_err(ndev, "No pmt irq resource\n");
1761 		ret = priv->pmt_irq;
1762 		goto err_pmt_irq;
1763 	}
1764 
1765 	ret = request_irq(priv->pmt_irq, xgmac_pmt_interrupt, 0,
1766 			  dev_name(&pdev->dev), ndev);
1767 	if (ret < 0) {
1768 		netdev_err(ndev, "Could not request irq %d - ret %d)\n",
1769 			priv->pmt_irq, ret);
1770 		goto err_pmt_irq;
1771 	}
1772 
1773 	device_set_wakeup_capable(&pdev->dev, 1);
1774 	if (device_can_wakeup(priv->device))
1775 		priv->wolopts = WAKE_MAGIC;	/* Magic Frame as default */
1776 
1777 	ndev->hw_features = NETIF_F_SG | NETIF_F_HIGHDMA;
1778 	if (readl(priv->base + XGMAC_DMA_HW_FEATURE) & DMA_HW_FEAT_TXCOESEL)
1779 		ndev->hw_features |= NETIF_F_IP_CSUM | NETIF_F_IPV6_CSUM |
1780 				     NETIF_F_RXCSUM;
1781 	ndev->features |= ndev->hw_features;
1782 	ndev->priv_flags |= IFF_UNICAST_FLT;
1783 
1784 	/* MTU range: 46 - 9000 */
1785 	ndev->min_mtu = ETH_ZLEN - ETH_HLEN;
1786 	ndev->max_mtu = XGMAC_MAX_MTU;
1787 
1788 	/* Get the MAC address */
1789 	xgmac_get_mac_addr(priv->base, addr, 0);
1790 	eth_hw_addr_set(ndev, addr);
1791 	if (!is_valid_ether_addr(ndev->dev_addr))
1792 		netdev_warn(ndev, "MAC address %pM not valid",
1793 			 ndev->dev_addr);
1794 
1795 	netif_napi_add(ndev, &priv->napi, xgmac_poll);
1796 	ret = register_netdev(ndev);
1797 	if (ret)
1798 		goto err_reg;
1799 
1800 	return 0;
1801 
1802 err_reg:
1803 	netif_napi_del(&priv->napi);
1804 	free_irq(priv->pmt_irq, ndev);
1805 err_pmt_irq:
1806 	free_irq(ndev->irq, ndev);
1807 err_irq:
1808 	iounmap(priv->base);
1809 err_io:
1810 	free_netdev(ndev);
1811 err_alloc:
1812 	release_mem_region(res->start, resource_size(res));
1813 	return ret;
1814 }
1815 
1816 /**
1817  * xgmac_remove
1818  * @pdev: platform device pointer
1819  * Description: this function resets the TX/RX processes, disables the MAC RX/TX
1820  * changes the link status, releases the DMA descriptor rings,
1821  * unregisters the MDIO bus and unmaps the allocated memory.
1822  */
1823 static int xgmac_remove(struct platform_device *pdev)
1824 {
1825 	struct net_device *ndev = platform_get_drvdata(pdev);
1826 	struct xgmac_priv *priv = netdev_priv(ndev);
1827 	struct resource *res;
1828 
1829 	xgmac_mac_disable(priv->base);
1830 
1831 	/* Free the IRQ lines */
1832 	free_irq(ndev->irq, ndev);
1833 	free_irq(priv->pmt_irq, ndev);
1834 
1835 	unregister_netdev(ndev);
1836 	netif_napi_del(&priv->napi);
1837 
1838 	iounmap(priv->base);
1839 	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
1840 	release_mem_region(res->start, resource_size(res));
1841 
1842 	free_netdev(ndev);
1843 
1844 	return 0;
1845 }
1846 
1847 #ifdef CONFIG_PM_SLEEP
1848 static void xgmac_pmt(void __iomem *ioaddr, unsigned long mode)
1849 {
1850 	unsigned int pmt = 0;
1851 
1852 	if (mode & WAKE_MAGIC)
1853 		pmt |= XGMAC_PMT_POWERDOWN | XGMAC_PMT_MAGIC_PKT_EN;
1854 	if (mode & WAKE_UCAST)
1855 		pmt |= XGMAC_PMT_POWERDOWN | XGMAC_PMT_GLBL_UNICAST;
1856 
1857 	writel(pmt, ioaddr + XGMAC_PMT);
1858 }
1859 
1860 static int xgmac_suspend(struct device *dev)
1861 {
1862 	struct net_device *ndev = dev_get_drvdata(dev);
1863 	struct xgmac_priv *priv = netdev_priv(ndev);
1864 	u32 value;
1865 
1866 	if (!ndev || !netif_running(ndev))
1867 		return 0;
1868 
1869 	netif_device_detach(ndev);
1870 	napi_disable(&priv->napi);
1871 	writel(0, priv->base + XGMAC_DMA_INTR_ENA);
1872 
1873 	if (device_may_wakeup(priv->device)) {
1874 		/* Stop TX/RX DMA Only */
1875 		value = readl(priv->base + XGMAC_DMA_CONTROL);
1876 		value &= ~(DMA_CONTROL_ST | DMA_CONTROL_SR);
1877 		writel(value, priv->base + XGMAC_DMA_CONTROL);
1878 
1879 		xgmac_pmt(priv->base, priv->wolopts);
1880 	} else
1881 		xgmac_mac_disable(priv->base);
1882 
1883 	return 0;
1884 }
1885 
1886 static int xgmac_resume(struct device *dev)
1887 {
1888 	struct net_device *ndev = dev_get_drvdata(dev);
1889 	struct xgmac_priv *priv = netdev_priv(ndev);
1890 	void __iomem *ioaddr = priv->base;
1891 
1892 	if (!netif_running(ndev))
1893 		return 0;
1894 
1895 	xgmac_pmt(ioaddr, 0);
1896 
1897 	/* Enable the MAC and DMA */
1898 	xgmac_mac_enable(ioaddr);
1899 	writel(DMA_INTR_DEFAULT_MASK, ioaddr + XGMAC_DMA_STATUS);
1900 	writel(DMA_INTR_DEFAULT_MASK, ioaddr + XGMAC_DMA_INTR_ENA);
1901 
1902 	netif_device_attach(ndev);
1903 	napi_enable(&priv->napi);
1904 
1905 	return 0;
1906 }
1907 #endif /* CONFIG_PM_SLEEP */
1908 
1909 static SIMPLE_DEV_PM_OPS(xgmac_pm_ops, xgmac_suspend, xgmac_resume);
1910 
1911 static const struct of_device_id xgmac_of_match[] = {
1912 	{ .compatible = "calxeda,hb-xgmac", },
1913 	{},
1914 };
1915 MODULE_DEVICE_TABLE(of, xgmac_of_match);
1916 
1917 static struct platform_driver xgmac_driver = {
1918 	.driver = {
1919 		.name = "calxedaxgmac",
1920 		.of_match_table = xgmac_of_match,
1921 		.pm = &xgmac_pm_ops,
1922 	},
1923 	.probe = xgmac_probe,
1924 	.remove = xgmac_remove,
1925 };
1926 
1927 module_platform_driver(xgmac_driver);
1928 
1929 MODULE_AUTHOR("Calxeda, Inc.");
1930 MODULE_DESCRIPTION("Calxeda 10G XGMAC driver");
1931 MODULE_LICENSE("GPL v2");
1932