summaryrefslogtreecommitdiff
path: root/drivers/net/ethernet/mediatek/mtk_eth_soc.h
blob: a5eb7c62306b66116df10a75df115fb4810534d9 (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
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
/*   This program is free software; you can redistribute it and/or modify
 *   it under the terms of the GNU General Public License as published by
 *   the Free Software Foundation; version 2 of the License
 *
 *   This program is distributed in the hope that it will be useful,
 *   but WITHOUT ANY WARRANTY; without even the implied warranty of
 *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *   GNU General Public License for more details.
 *
 *   Copyright (C) 2009-2016 John Crispin <blogic@openwrt.org>
 *   Copyright (C) 2009-2016 Felix Fietkau <nbd@openwrt.org>
 *   Copyright (C) 2013-2016 Michael Lee <igvtee@gmail.com>
 */

#ifndef MTK_ETH_H
#define MTK_ETH_H

#define MTK_QDMA_PAGE_SIZE	2048
#define	MTK_MAX_RX_LENGTH	1536
#define MTK_TX_DMA_BUF_LEN	0x3fff
#define MTK_DMA_SIZE		256
#define MTK_NAPI_WEIGHT		64
#define MTK_MAC_COUNT		2
#define MTK_RX_ETH_HLEN		(VLAN_ETH_HLEN + VLAN_HLEN + ETH_FCS_LEN)
#define MTK_RX_HLEN		(NET_SKB_PAD + MTK_RX_ETH_HLEN + NET_IP_ALIGN)
#define MTK_DMA_DUMMY_DESC	0xffffffff
#define MTK_DEFAULT_MSG_ENABLE	(NETIF_MSG_DRV | \
				 NETIF_MSG_PROBE | \
				 NETIF_MSG_LINK | \
				 NETIF_MSG_TIMER | \
				 NETIF_MSG_IFDOWN | \
				 NETIF_MSG_IFUP | \
				 NETIF_MSG_RX_ERR | \
				 NETIF_MSG_TX_ERR)
#define MTK_HW_FEATURES		(NETIF_F_IP_CSUM | \
				 NETIF_F_RXCSUM | \
				 NETIF_F_HW_VLAN_CTAG_TX | \
				 NETIF_F_HW_VLAN_CTAG_RX | \
				 NETIF_F_SG | NETIF_F_TSO | \
				 NETIF_F_TSO6 | \
				 NETIF_F_IPV6_CSUM)
#define NEXT_RX_DESP_IDX(X)	(((X) + 1) & (MTK_DMA_SIZE - 1))

/* Frame Engine Global Reset Register */
#define MTK_RST_GL		0x04
#define RST_GL_PSE		BIT(0)

/* Frame Engine Interrupt Status Register */
#define MTK_INT_STATUS2		0x08
#define MTK_GDM1_AF		BIT(28)
#define MTK_GDM2_AF		BIT(29)

/* Frame Engine Interrupt Grouping Register */
#define MTK_FE_INT_GRP		0x20

/* CDMP Exgress Control Register */
#define MTK_CDMP_EG_CTRL	0x404

/* GDM Exgress Control Register */
#define MTK_GDMA_FWD_CFG(x)	(0x500 + (x * 0x1000))
#define MTK_GDMA_ICS_EN		BIT(22)
#define MTK_GDMA_TCS_EN		BIT(21)
#define MTK_GDMA_UCS_EN		BIT(20)

/* Unicast Filter MAC Address Register - Low */
#define MTK_GDMA_MAC_ADRL(x)	(0x508 + (x * 0x1000))

/* Unicast Filter MAC Address Register - High */
#define MTK_GDMA_MAC_ADRH(x)	(0x50C + (x * 0x1000))

/* QDMA TX Queue Configuration Registers */
#define MTK_QTX_CFG(x)		(0x1800 + (x * 0x10))
#define QDMA_RES_THRES		4

/* QDMA TX Queue Scheduler Registers */
#define MTK_QTX_SCH(x)		(0x1804 + (x * 0x10))

/* QDMA RX Base Pointer Register */
#define MTK_QRX_BASE_PTR0	0x1900

/* QDMA RX Maximum Count Register */
#define MTK_QRX_MAX_CNT0	0x1904

/* QDMA RX CPU Pointer Register */
#define MTK_QRX_CRX_IDX0	0x1908

/* QDMA RX DMA Pointer Register */
#define MTK_QRX_DRX_IDX0	0x190C

/* QDMA Global Configuration Register */
#define MTK_QDMA_GLO_CFG	0x1A04
#define MTK_RX_2B_OFFSET	BIT(31)
#define MTK_RX_BT_32DWORDS	(3 << 11)
#define MTK_NDP_CO_PRO		BIT(10)
#define MTK_TX_WB_DDONE		BIT(6)
#define MTK_DMA_SIZE_16DWORDS	(2 << 4)
#define MTK_RX_DMA_BUSY		BIT(3)
#define MTK_TX_DMA_BUSY		BIT(1)
#define MTK_RX_DMA_EN		BIT(2)
#define MTK_TX_DMA_EN		BIT(0)
#define MTK_DMA_BUSY_TIMEOUT	HZ

/* QDMA Reset Index Register */
#define MTK_QDMA_RST_IDX	0x1A08
#define MTK_PST_DRX_IDX0	BIT(16)

/* QDMA Delay Interrupt Register */
#define MTK_QDMA_DELAY_INT	0x1A0C

/* QDMA Flow Control Register */
#define MTK_QDMA_FC_THRES	0x1A10
#define FC_THRES_DROP_MODE	BIT(20)
#define FC_THRES_DROP_EN	(7 << 16)
#define FC_THRES_MIN		0x4444

/* QDMA Interrupt Status Register */
#define MTK_QMTK_INT_STATUS	0x1A18
#define MTK_RX_DONE_INT1	BIT(17)
#define MTK_RX_DONE_INT0	BIT(16)
#define MTK_TX_DONE_INT3	BIT(3)
#define MTK_TX_DONE_INT2	BIT(2)
#define MTK_TX_DONE_INT1	BIT(1)
#define MTK_TX_DONE_INT0	BIT(0)
#define MTK_RX_DONE_INT		(MTK_RX_DONE_INT0 | MTK_RX_DONE_INT1)
#define MTK_TX_DONE_INT		(MTK_TX_DONE_INT0 | MTK_TX_DONE_INT1 | \
				 MTK_TX_DONE_INT2 | MTK_TX_DONE_INT3)

/* QDMA Interrupt Status Register */
#define MTK_QDMA_INT_MASK	0x1A1C

/* QDMA Interrupt Mask Register */
#define MTK_QDMA_HRED2		0x1A44

/* QDMA TX Forward CPU Pointer Register */
#define MTK_QTX_CTX_PTR		0x1B00

/* QDMA TX Forward DMA Pointer Register */
#define MTK_QTX_DTX_PTR		0x1B04

/* QDMA TX Release CPU Pointer Register */
#define MTK_QTX_CRX_PTR		0x1B10

/* QDMA TX Release DMA Pointer Register */
#define MTK_QTX_DRX_PTR		0x1B14

/* QDMA FQ Head Pointer Register */
#define MTK_QDMA_FQ_HEAD	0x1B20

/* QDMA FQ Head Pointer Register */
#define MTK_QDMA_FQ_TAIL	0x1B24

/* QDMA FQ Free Page Counter Register */
#define MTK_QDMA_FQ_CNT		0x1B28

/* QDMA FQ Free Page Buffer Length Register */
#define MTK_QDMA_FQ_BLEN	0x1B2C

/* GMA1 Received Good Byte Count Register */
#define MTK_GDM1_TX_GBCNT	0x2400
#define MTK_STAT_OFFSET		0x40

/* QDMA descriptor txd4 */
#define TX_DMA_CHKSUM		(0x7 << 29)
#define TX_DMA_TSO		BIT(28)
#define TX_DMA_FPORT_SHIFT	25
#define TX_DMA_FPORT_MASK	0x7
#define TX_DMA_INS_VLAN		BIT(16)

/* QDMA descriptor txd3 */
#define TX_DMA_OWNER_CPU	BIT(31)
#define TX_DMA_LS0		BIT(30)
#define TX_DMA_PLEN0(_x)	(((_x) & MTK_TX_DMA_BUF_LEN) << 16)
#define TX_DMA_SWC		BIT(14)
#define TX_DMA_SDL(_x)		(((_x) & 0x3fff) << 16)

/* QDMA descriptor rxd2 */
#define RX_DMA_DONE		BIT(31)
#define RX_DMA_PLEN0(_x)	(((_x) & 0x3fff) << 16)
#define RX_DMA_GET_PLEN0(_x)	(((_x) >> 16) & 0x3fff)

/* QDMA descriptor rxd3 */
#define RX_DMA_VID(_x)		((_x) & 0xfff)

/* QDMA descriptor rxd4 */
#define RX_DMA_L4_VALID		BIT(24)
#define RX_DMA_FPORT_SHIFT	19
#define RX_DMA_FPORT_MASK	0x7

/* PHY Indirect Access Control registers */
#define MTK_PHY_IAC		0x10004
#define PHY_IAC_ACCESS		BIT(31)
#define PHY_IAC_READ		BIT(19)
#define PHY_IAC_WRITE		BIT(18)
#define PHY_IAC_START		BIT(16)
#define PHY_IAC_ADDR_SHIFT	20
#define PHY_IAC_REG_SHIFT	25
#define PHY_IAC_TIMEOUT		HZ

/* Mac control registers */
#define MTK_MAC_MCR(x)		(0x10100 + (x * 0x100))
#define MAC_MCR_MAX_RX_1536	BIT(24)
#define MAC_MCR_IPG_CFG		(BIT(18) | BIT(16))
#define MAC_MCR_FORCE_MODE	BIT(15)
#define MAC_MCR_TX_EN		BIT(14)
#define MAC_MCR_RX_EN		BIT(13)
#define MAC_MCR_BACKOFF_EN	BIT(9)
#define MAC_MCR_BACKPR_EN	BIT(8)
#define MAC_MCR_FORCE_RX_FC	BIT(5)
#define MAC_MCR_FORCE_TX_FC	BIT(4)
#define MAC_MCR_SPEED_1000	BIT(3)
#define MAC_MCR_SPEED_100	BIT(2)
#define MAC_MCR_FORCE_DPX	BIT(1)
#define MAC_MCR_FORCE_LINK	BIT(0)
#define MAC_MCR_FIXED_LINK	(MAC_MCR_MAX_RX_1536 | MAC_MCR_IPG_CFG | \
				 MAC_MCR_FORCE_MODE | MAC_MCR_TX_EN | \
				 MAC_MCR_RX_EN | MAC_MCR_BACKOFF_EN | \
				 MAC_MCR_BACKPR_EN | MAC_MCR_FORCE_RX_FC | \
				 MAC_MCR_FORCE_TX_FC | MAC_MCR_SPEED_1000 | \
				 MAC_MCR_FORCE_DPX | MAC_MCR_FORCE_LINK)

/* GPIO port control registers for GMAC 2*/
#define GPIO_OD33_CTRL8		0x4c0
#define GPIO_BIAS_CTRL		0xed0
#define GPIO_DRV_SEL10		0xf00

/* ethernet subsystem config register */
#define ETHSYS_SYSCFG0		0x14
#define SYSCFG0_GE_MASK		0x3
#define SYSCFG0_GE_MODE(x, y)	(x << (12 + (y * 2)))

struct mtk_rx_dma {
	unsigned int rxd1;
	unsigned int rxd2;
	unsigned int rxd3;
	unsigned int rxd4;
} __packed __aligned(4);

struct mtk_tx_dma {
	unsigned int txd1;
	unsigned int txd2;
	unsigned int txd3;
	unsigned int txd4;
} __packed __aligned(4);

struct mtk_eth;
struct mtk_mac;

/* struct mtk_hw_stats - the structure that holds the traffic statistics.
 * @stats_lock:		make sure that stats operations are atomic
 * @reg_offset:		the status register offset of the SoC
 * @syncp:		the refcount
 *
 * All of the supported SoCs have hardware counters for traffic statistics.
 * Whenever the status IRQ triggers we can read the latest stats from these
 * counters and store them in this struct.
 */
struct mtk_hw_stats {
	u64 tx_bytes;
	u64 tx_packets;
	u64 tx_skip;
	u64 tx_collisions;
	u64 rx_bytes;
	u64 rx_packets;
	u64 rx_overflow;
	u64 rx_fcs_errors;
	u64 rx_short_errors;
	u64 rx_long_errors;
	u64 rx_checksum_errors;
	u64 rx_flow_control_packets;

	spinlock_t		stats_lock;
	u32			reg_offset;
	struct u64_stats_sync	syncp;
};

/* PDMA descriptor can point at 1-2 segments. This enum allows us to track how
 * memory was allocated so that it can be freed properly
 */
enum mtk_tx_flags {
	MTK_TX_FLAGS_SINGLE0	= 0x01,
	MTK_TX_FLAGS_PAGE0	= 0x02,
};

/* struct mtk_tx_buf -	This struct holds the pointers to the memory pointed at
 *			by the TX descriptor	s
 * @skb:		The SKB pointer of the packet being sent
 * @dma_addr0:		The base addr of the first segment
 * @dma_len0:		The length of the first segment
 * @dma_addr1:		The base addr of the second segment
 * @dma_len1:		The length of the second segment
 */
struct mtk_tx_buf {
	struct sk_buff *skb;
	u32 flags;
	DEFINE_DMA_UNMAP_ADDR(dma_addr0);
	DEFINE_DMA_UNMAP_LEN(dma_len0);
	DEFINE_DMA_UNMAP_ADDR(dma_addr1);
	DEFINE_DMA_UNMAP_LEN(dma_len1);
};

/* struct mtk_tx_ring -	This struct holds info describing a TX ring
 * @dma:		The descriptor ring
 * @buf:		The memory pointed at by the ring
 * @phys:		The physical addr of tx_buf
 * @next_free:		Pointer to the next free descriptor
 * @last_free:		Pointer to the last free descriptor
 * @thresh:		The threshold of minimum amount of free descriptors
 * @free_count:		QDMA uses a linked list. Track how many free descriptors
 *			are present
 */
struct mtk_tx_ring {
	struct mtk_tx_dma *dma;
	struct mtk_tx_buf *buf;
	dma_addr_t phys;
	struct mtk_tx_dma *next_free;
	struct mtk_tx_dma *last_free;
	u16 thresh;
	atomic_t free_count;
};

/* struct mtk_rx_ring -	This struct holds info describing a RX ring
 * @dma:		The descriptor ring
 * @data:		The memory pointed at by the ring
 * @phys:		The physical addr of rx_buf
 * @frag_size:		How big can each fragment be
 * @buf_size:		The size of each packet buffer
 * @calc_idx:		The current head of ring
 */
struct mtk_rx_ring {
	struct mtk_rx_dma *dma;
	u8 **data;
	dma_addr_t phys;
	u16 frag_size;
	u16 buf_size;
	u16 calc_idx;
};

/* currently no SoC has more than 2 macs */
#define MTK_MAX_DEVS			2

/* struct mtk_eth -	This is the main datasructure for holding the state
 *			of the driver
 * @dev:		The device pointer
 * @base:		The mapped register i/o base
 * @page_lock:		Make sure that register operations are atomic
 * @dummy_dev:		we run 2 netdevs on 1 physical DMA ring and need a
 *			dummy for NAPI to work
 * @netdev:		The netdev instances
 * @mac:		Each netdev is linked to a physical MAC
 * @irq:		The IRQ that we are using
 * @msg_enable:		Ethtool msg level
 * @ethsys:		The register map pointing at the range used to setup
 *			MII modes
 * @pctl:		The register map pointing at the range used to setup
 *			GMAC port drive/slew values
 * @dma_refcnt:		track how many netdevs are using the DMA engine
 * @tx_ring:		Pointer to the memore holding info about the TX ring
 * @rx_ring:		Pointer to the memore holding info about the RX ring
 * @rx_napi:		The NAPI struct
 * @scratch_ring:	Newer SoCs need memory for a second HW managed TX ring
 * @phy_scratch_ring:	physical address of scratch_ring
 * @scratch_head:	The scratch memory that scratch_ring points to.
 * @clk_ethif:		The ethif clock
 * @clk_esw:		The switch clock
 * @clk_gp1:		The gmac1 clock
 * @clk_gp2:		The gmac2 clock
 * @mii_bus:		If there is a bus we need to create an instance for it
 * @pending_work:	The workqueue used to reset the dma ring
 */

struct mtk_eth {
	struct device			*dev;
	void __iomem			*base;
	struct reset_control		*rstc;
	spinlock_t			page_lock;
	struct net_device		dummy_dev;
	struct net_device		*netdev[MTK_MAX_DEVS];
	struct mtk_mac			*mac[MTK_MAX_DEVS];
	int				irq;
	u32				msg_enable;
	unsigned long			sysclk;
	struct regmap			*ethsys;
	struct regmap			*pctl;
	atomic_t			dma_refcnt;
	struct mtk_tx_ring		tx_ring;
	struct mtk_rx_ring		rx_ring;
	struct napi_struct		rx_napi;
	struct mtk_tx_dma		*scratch_ring;
	dma_addr_t			phy_scratch_ring;
	void				*scratch_head;
	struct clk			*clk_ethif;
	struct clk			*clk_esw;
	struct clk			*clk_gp1;
	struct clk			*clk_gp2;
	struct mii_bus			*mii_bus;
	struct work_struct		pending_work;
};

/* struct mtk_mac -	the structure that holds the info about the MACs of the
 *			SoC
 * @id:			The number of the MAC
 * @of_node:		Our devicetree node
 * @hw:			Backpointer to our main datastruture
 * @hw_stats:		Packet statistics counter
 * @phy_dev:		The attached PHY if available
 */
struct mtk_mac {
	int				id;
	struct device_node		*of_node;
	struct mtk_eth			*hw;
	struct mtk_hw_stats		*hw_stats;
	struct phy_device		*phy_dev;
};

/* the struct describing the SoC. these are declared in the soc_xyz.c files */
extern const struct of_device_id of_mtk_match[];

/* read the hardware status register */
void mtk_stats_update_mac(struct mtk_mac *mac);

void mtk_w32(struct mtk_eth *eth, u32 val, unsigned reg);
u32 mtk_r32(struct mtk_eth *eth, unsigned reg);

#endif /* MTK_ETH_H */