summaryrefslogtreecommitdiffstats
path: root/drivers/net/ethernet/qualcomm/emac/emac-mac.h
blob: 920123eb8aced544bc227b5fcc3187a9ddf67b1c (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
/* SPDX-License-Identifier: GPL-2.0-only */
/* Copyright (c) 2013-2016, The Linux Foundation. All rights reserved.
 */

/* EMAC DMA HW engine uses three rings:
 * Tx:
 *   TPD: Transmit Packet Descriptor ring.
 * Rx:
 *   RFD: Receive Free Descriptor ring.
 *     Ring of descriptors with empty buffers to be filled by Rx HW.
 *   RRD: Receive Return Descriptor ring.
 *     Ring of descriptors with buffers filled with received data.
 */

#ifndef _EMAC_HW_H_
#define _EMAC_HW_H_

/* EMAC_CSR register offsets */
#define EMAC_EMAC_WRAPPER_CSR1                                0x000000
#define EMAC_EMAC_WRAPPER_CSR2                                0x000004
#define EMAC_EMAC_WRAPPER_TX_TS_LO                            0x000104
#define EMAC_EMAC_WRAPPER_TX_TS_HI                            0x000108
#define EMAC_EMAC_WRAPPER_TX_TS_INX                           0x00010c

/* DMA Order Settings */
enum emac_dma_order {
	emac_dma_ord_in = 1,
	emac_dma_ord_enh = 2,
	emac_dma_ord_out = 4
};

enum emac_dma_req_block {
	emac_dma_req_128 = 0,
	emac_dma_req_256 = 1,
	emac_dma_req_512 = 2,
	emac_dma_req_1024 = 3,
	emac_dma_req_2048 = 4,
	emac_dma_req_4096 = 5
};

/* Returns the value of bits idx...idx+n_bits */
#define BITS_GET(val, lo, hi) ((le32_to_cpu(val) & GENMASK((hi), (lo))) >> lo)
#define BITS_SET(val, lo, hi, new_val) \
	val = cpu_to_le32((le32_to_cpu(val) & (~GENMASK((hi), (lo)))) |	\
		(((new_val) << (lo)) & GENMASK((hi), (lo))))

/* RRD (Receive Return Descriptor) */
struct emac_rrd {
	u32	word[6];

/* number of RFD */
#define RRD_NOR(rrd)			BITS_GET((rrd)->word[0], 16, 19)
/* start consumer index of rfd-ring */
#define RRD_SI(rrd)			BITS_GET((rrd)->word[0], 20, 31)
/* vlan-tag (CVID, CFI and PRI) */
#define RRD_CVALN_TAG(rrd)		BITS_GET((rrd)->word[2], 0, 15)
/* length of the packet */
#define RRD_PKT_SIZE(rrd)		BITS_GET((rrd)->word[3], 0, 13)
/* L4(TCP/UDP) checksum failed */
#define RRD_L4F(rrd)			BITS_GET((rrd)->word[3], 14, 14)
/* vlan tagged */
#define RRD_CVTAG(rrd)			BITS_GET((rrd)->word[3], 16, 16)
/* When set, indicates that the descriptor is updated by the IP core.
 * When cleared, indicates that the descriptor is invalid.
 */
#define RRD_UPDT(rrd)			BITS_GET((rrd)->word[3], 31, 31)
#define RRD_UPDT_SET(rrd, val)		BITS_SET((rrd)->word[3], 31, 31, val)
/* timestamp low */
#define RRD_TS_LOW(rrd)			BITS_GET((rrd)->word[4], 0, 29)
/* timestamp high */
#define RRD_TS_HI(rrd)			le32_to_cpu((rrd)->word[5])
};

/* TPD (Transmit Packet Descriptor) */
struct emac_tpd {
	u32				word[4];

/* Number of bytes of the transmit packet. (include 4-byte CRC) */
#define TPD_BUF_LEN_SET(tpd, val)	BITS_SET((tpd)->word[0], 0, 15, val)
/* Custom Checksum Offload: When set, ask IP core to offload custom checksum */
#define TPD_CSX_SET(tpd, val)		BITS_SET((tpd)->word[1], 8, 8, val)
/* TCP Large Send Offload: When set, ask IP core to do offload TCP Large Send */
#define TPD_LSO(tpd)			BITS_GET((tpd)->word[1], 12, 12)
#define TPD_LSO_SET(tpd, val)		BITS_SET((tpd)->word[1], 12, 12, val)
/*  Large Send Offload Version: When set, indicates this is an LSOv2
 * (for both IPv4 and IPv6). When cleared, indicates this is an LSOv1
 * (only for IPv4).
 */
#define TPD_LSOV_SET(tpd, val)		BITS_SET((tpd)->word[1], 13, 13, val)
/* IPv4 packet: When set, indicates this is an  IPv4 packet, this bit is only
 * for LSOV2 format.
 */
#define TPD_IPV4_SET(tpd, val)		BITS_SET((tpd)->word[1], 16, 16, val)
/* 0: Ethernet   frame (DA+SA+TYPE+DATA+CRC)
 * 1: IEEE 802.3 frame (DA+SA+LEN+DSAP+SSAP+CTL+ORG+TYPE+DATA+CRC)
 */
#define TPD_TYP_SET(tpd, val)		BITS_SET((tpd)->word[1], 17, 17, val)
/* Low-32bit Buffer Address */
#define TPD_BUFFER_ADDR_L_SET(tpd, val)	((tpd)->word[2] = cpu_to_le32(val))
/* CVLAN Tag to be inserted if INS_VLAN_TAG is set, CVLAN TPID based on global
 * register configuration.
 */
#define TPD_CVLAN_TAG_SET(tpd, val)	BITS_SET((tpd)->word[3], 0, 15, val)
/*  Insert CVlan Tag: When set, ask MAC to insert CVLAN TAG to outgoing packet
 */
#define TPD_INSTC_SET(tpd, val)		BITS_SET((tpd)->word[3], 17, 17, val)
/* High-14bit Buffer Address, So, the 64b-bit address is
 * {DESC_CTRL_11_TX_DATA_HIADDR[17:0],(register) BUFFER_ADDR_H, BUFFER_ADDR_L}
 * Extend TPD_BUFFER_ADDR_H to [31, 18], because we never enable timestamping.
 */
#define TPD_BUFFER_ADDR_H_SET(tpd, val)	BITS_SET((tpd)->word[3], 18, 31, val)
/* Format D. Word offset from the 1st byte of this packet to start to calculate
 * the custom checksum.
 */
#define TPD_PAYLOAD_OFFSET_SET(tpd, val) BITS_SET((tpd)->word[1], 0, 7, val)
/*  Format D. Word offset from the 1st byte of this packet to fill the custom
 * checksum to
 */
#define TPD_CXSUM_OFFSET_SET(tpd, val)	BITS_SET((tpd)->word[1], 18, 25, val)

/* Format C. TCP Header offset from the 1st byte of this packet. (byte unit) */
#define TPD_TCPHDR_OFFSET_SET(tpd, val)	BITS_SET((tpd)->word[1], 0, 7, val)
/* Format C. MSS (Maximum Segment Size) got from the protocol layer. (byte unit)
 */
#define TPD_MSS_SET(tpd, val)		BITS_SET((tpd)->word[1], 18, 30, val)
/* packet length in ext tpd */
#define TPD_PKT_LEN_SET(tpd, val)	((tpd)->word[2] = cpu_to_le32(val))
};

/* emac_ring_header represents a single, contiguous block of DMA space
 * mapped for the three descriptor rings (tpd, rfd, rrd)
 */
struct emac_ring_header {
	void			*v_addr;	/* virtual address */
	dma_addr_t		dma_addr;	/* dma address */
	size_t			size;		/* length in bytes */
	size_t			used;
};

/* emac_buffer is wrapper around a pointer to a socket buffer
 * so a DMA handle can be stored along with the skb
 */
struct emac_buffer {
	struct sk_buff		*skb;		/* socket buffer */
	u16			length;		/* rx buffer length */
	dma_addr_t		dma_addr;	/* dma address */
};

/* receive free descriptor (rfd) ring */
struct emac_rfd_ring {
	struct emac_buffer	*rfbuff;
	u32			*v_addr;	/* virtual address */
	dma_addr_t		dma_addr;	/* dma address */
	size_t			size;		/* length in bytes */
	unsigned int		count;		/* number of desc in the ring */
	unsigned int		produce_idx;
	unsigned int		process_idx;
	unsigned int		consume_idx;	/* unused */
};

/* Receive Return Desciptor (RRD) ring */
struct emac_rrd_ring {
	u32			*v_addr;	/* virtual address */
	dma_addr_t		dma_addr;	/* physical address */
	size_t			size;		/* length in bytes */
	unsigned int		count;		/* number of desc in the ring */
	unsigned int		produce_idx;	/* unused */
	unsigned int		consume_idx;
};

/* Rx queue */
struct emac_rx_queue {
	struct net_device	*netdev;	/* netdev ring belongs to */
	struct emac_rrd_ring	rrd;
	struct emac_rfd_ring	rfd;
	struct napi_struct	napi;
	struct emac_irq		*irq;

	u32			intr;
	u32			produce_mask;
	u32			process_mask;
	u32			consume_mask;

	u16			produce_reg;
	u16			process_reg;
	u16			consume_reg;

	u8			produce_shift;
	u8			process_shft;
	u8			consume_shift;
};

/* Transimit Packet Descriptor (tpd) ring */
struct emac_tpd_ring {
	struct emac_buffer	*tpbuff;
	u32			*v_addr;	/* virtual address */
	dma_addr_t		dma_addr;	/* dma address */

	size_t			size;		/* length in bytes */
	unsigned int		count;		/* number of desc in the ring */
	unsigned int		produce_idx;
	unsigned int		consume_idx;
	unsigned int		last_produce_idx;
};

/* Tx queue */
struct emac_tx_queue {
	struct emac_tpd_ring	tpd;

	u32			produce_mask;
	u32			consume_mask;

	u16			max_packets;	/* max packets per interrupt */
	u16			produce_reg;
	u16			consume_reg;

	u8			produce_shift;
	u8			consume_shift;
};

struct emac_adapter;

int  emac_mac_up(struct emac_adapter *adpt);
void emac_mac_down(struct emac_adapter *adpt);
void emac_mac_reset(struct emac_adapter *adpt);
void emac_mac_stop(struct emac_adapter *adpt);
void emac_mac_mode_config(struct emac_adapter *adpt);
void emac_mac_rx_process(struct emac_adapter *adpt, struct emac_rx_queue *rx_q,
			 int *num_pkts, int max_pkts);
netdev_tx_t emac_mac_tx_buf_send(struct emac_adapter *adpt,
				 struct emac_tx_queue *tx_q,
				 struct sk_buff *skb);
void emac_mac_tx_process(struct emac_adapter *adpt, struct emac_tx_queue *tx_q);
void emac_mac_rx_tx_ring_init_all(struct platform_device *pdev,
				  struct emac_adapter *adpt);
int  emac_mac_rx_tx_rings_alloc_all(struct emac_adapter *adpt);
void emac_mac_rx_tx_rings_free_all(struct emac_adapter *adpt);
void emac_mac_multicast_addr_clear(struct emac_adapter *adpt);
void emac_mac_multicast_addr_set(struct emac_adapter *adpt, u8 *addr);

#endif /*_EMAC_HW_H_*/