1/* SPDX-License-Identifier: GPL-2.0-or-later */
2/*
3 * Applied Micro X-Gene SoC Ethernet v2 Driver
4 *
5 * Copyright (c) 2017, Applied Micro Circuits Corporation
6 * Author(s): Iyappan Subramanian <isubramanian@apm.com>
7 *	      Keyur Chudgar <kchudgar@apm.com>
8 */
9
10#ifndef __XGENE_ENET_V2_RING_H__
11#define __XGENE_ENET_V2_RING_H__
12
13#define XGENE_ENET_DESC_SIZE	64
14#define XGENE_ENET_NUM_DESC	256
15#define NUM_BUFS		8
16#define SLOT_EMPTY		0xfff
17
18#define DMATXCTRL		0xa180
19#define DMATXDESCL		0xa184
20#define DMATXDESCH		0xa1a0
21#define DMATXSTATUS		0xa188
22#define DMARXCTRL		0xa18c
23#define DMARXDESCL		0xa190
24#define DMARXDESCH		0xa1a4
25#define DMARXSTATUS		0xa194
26#define DMAINTRMASK		0xa198
27#define DMAINTERRUPT		0xa19c
28
29#define D_POS			62
30#define D_LEN			2
31#define E_POS			63
32#define E_LEN			1
33#define PKT_ADDRL_POS		0
34#define PKT_ADDRL_LEN		32
35#define PKT_ADDRH_POS		32
36#define PKT_ADDRH_LEN		10
37#define PKT_SIZE_POS		32
38#define PKT_SIZE_LEN		12
39#define NEXT_DESC_ADDRL_POS	0
40#define NEXT_DESC_ADDRL_LEN	32
41#define NEXT_DESC_ADDRH_POS	48
42#define NEXT_DESC_ADDRH_LEN	10
43
44#define TXPKTCOUNT_POS		16
45#define TXPKTCOUNT_LEN		8
46#define RXPKTCOUNT_POS		16
47#define RXPKTCOUNT_LEN		8
48
49#define TX_PKT_SENT		BIT(0)
50#define TX_BUS_ERROR		BIT(3)
51#define RX_PKT_RCVD		BIT(4)
52#define RX_BUS_ERROR		BIT(7)
53#define RXSTATUS_RXPKTRCVD	BIT(0)
54
55struct xge_raw_desc {
56	__le64 m0;
57	__le64 m1;
58	__le64 m2;
59	__le64 m3;
60	__le64 m4;
61	__le64 m5;
62	__le64 m6;
63	__le64 m7;
64};
65
66struct pkt_info {
67	struct sk_buff *skb;
68	dma_addr_t dma_addr;
69	void *pkt_buf;
70};
71
72/* software context of a descriptor ring */
73struct xge_desc_ring {
74	struct net_device *ndev;
75	dma_addr_t dma_addr;
76	u8 head;
77	u8 tail;
78	union {
79		void *desc_addr;
80		struct xge_raw_desc *raw_desc;
81	};
82	struct pkt_info (*pkt_info);
83};
84
85static inline u64 xge_set_desc_bits(int pos, int len, u64 val)
86{
87	return (val & ((1ULL << len) - 1)) << pos;
88}
89
90static inline u64 xge_get_desc_bits(int pos, int len, u64 src)
91{
92	return (src >> pos) & ((1ULL << len) - 1);
93}
94
95#define SET_BITS(field, val) \
96		xge_set_desc_bits(field ## _POS, field ## _LEN, val)
97
98#define GET_BITS(field, src) \
99		xge_get_desc_bits(field ## _POS, field ## _LEN, src)
100
101void xge_setup_desc(struct xge_desc_ring *ring);
102void xge_update_tx_desc_addr(struct xge_pdata *pdata);
103void xge_update_rx_desc_addr(struct xge_pdata *pdata);
104void xge_intr_enable(struct xge_pdata *pdata);
105void xge_intr_disable(struct xge_pdata *pdata);
106
107#endif  /* __XGENE_ENET_V2_RING_H__ */
108