summaryrefslogtreecommitdiff
path: root/drivers/net/zynq_gem.c
blob: 6a017a8102736d95286f2659d424ff4270306a99 (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
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
/*
 * (C) Copyright 2011 Michal Simek
 *
 * Michal SIMEK <monstr@monstr.eu>
 *
 * Based on Xilinx gmac driver:
 * (C) Copyright 2011 Xilinx
 *
 * SPDX-License-Identifier:	GPL-2.0+
 */

#include <common.h>
#include <net.h>
#include <config.h>
#include <malloc.h>
#include <asm/io.h>
#include <phy.h>
#include <miiphy.h>
#include <watchdog.h>
#include <asm/arch/hardware.h>
#include <asm/arch/sys_proto.h>

#if !defined(CONFIG_PHYLIB)
# error XILINX_GEM_ETHERNET requires PHYLIB
#endif

/* Bit/mask specification */
#define ZYNQ_GEM_PHYMNTNC_OP_MASK	0x40020000 /* operation mask bits */
#define ZYNQ_GEM_PHYMNTNC_OP_R_MASK	0x20000000 /* read operation */
#define ZYNQ_GEM_PHYMNTNC_OP_W_MASK	0x10000000 /* write operation */
#define ZYNQ_GEM_PHYMNTNC_PHYAD_SHIFT_MASK	23 /* Shift bits for PHYAD */
#define ZYNQ_GEM_PHYMNTNC_PHREG_SHIFT_MASK	18 /* Shift bits for PHREG */

#define ZYNQ_GEM_RXBUF_EOF_MASK		0x00008000 /* End of frame. */
#define ZYNQ_GEM_RXBUF_SOF_MASK		0x00004000 /* Start of frame. */
#define ZYNQ_GEM_RXBUF_LEN_MASK		0x00003FFF /* Mask for length field */

#define ZYNQ_GEM_RXBUF_WRAP_MASK	0x00000002 /* Wrap bit, last BD */
#define ZYNQ_GEM_RXBUF_NEW_MASK		0x00000001 /* Used bit.. */
#define ZYNQ_GEM_RXBUF_ADD_MASK		0xFFFFFFFC /* Mask for address */

/* Wrap bit, last descriptor */
#define ZYNQ_GEM_TXBUF_WRAP_MASK	0x40000000
#define ZYNQ_GEM_TXBUF_LAST_MASK	0x00008000 /* Last buffer */

#define ZYNQ_GEM_NWCTRL_TXEN_MASK	0x00000008 /* Enable transmit */
#define ZYNQ_GEM_NWCTRL_RXEN_MASK	0x00000004 /* Enable receive */
#define ZYNQ_GEM_NWCTRL_MDEN_MASK	0x00000010 /* Enable MDIO port */
#define ZYNQ_GEM_NWCTRL_STARTTX_MASK	0x00000200 /* Start tx (tx_go) */

#define ZYNQ_GEM_NWCFG_SPEED100		0x000000001 /* 100 Mbps operation */
#define ZYNQ_GEM_NWCFG_SPEED1000	0x000000400 /* 1Gbps operation */
#define ZYNQ_GEM_NWCFG_FDEN		0x000000002 /* Full Duplex mode */
#define ZYNQ_GEM_NWCFG_FSREM		0x000020000 /* FCS removal */
#define ZYNQ_GEM_NWCFG_MDCCLKDIV	0x000080000 /* Div pclk by 32, 80MHz */
#define ZYNQ_GEM_NWCFG_MDCCLKDIV2	0x0000c0000 /* Div pclk by 48, 120MHz */

#define ZYNQ_GEM_NWCFG_INIT		(ZYNQ_GEM_NWCFG_FDEN | \
					ZYNQ_GEM_NWCFG_FSREM | \
					ZYNQ_GEM_NWCFG_MDCCLKDIV)

#define ZYNQ_GEM_NWSR_MDIOIDLE_MASK	0x00000004 /* PHY management idle */

#define ZYNQ_GEM_DMACR_BLENGTH		0x00000004 /* INCR4 AHB bursts */
/* Use full configured addressable space (8 Kb) */
#define ZYNQ_GEM_DMACR_RXSIZE		0x00000300
/* Use full configured addressable space (4 Kb) */
#define ZYNQ_GEM_DMACR_TXSIZE		0x00000400
/* Set with binary 00011000 to use 1536 byte(1*max length frame/buffer) */
#define ZYNQ_GEM_DMACR_RXBUF		0x00180000

#define ZYNQ_GEM_DMACR_INIT		(ZYNQ_GEM_DMACR_BLENGTH | \
					ZYNQ_GEM_DMACR_RXSIZE | \
					ZYNQ_GEM_DMACR_TXSIZE | \
					ZYNQ_GEM_DMACR_RXBUF)

/* Use MII register 1 (MII status register) to detect PHY */
#define PHY_DETECT_REG  1

/* Mask used to verify certain PHY features (or register contents)
 * in the register above:
 *  0x1000: 10Mbps full duplex support
 *  0x0800: 10Mbps half duplex support
 *  0x0008: Auto-negotiation support
 */
#define PHY_DETECT_MASK 0x1808

/* TX BD status masks */
#define ZYNQ_GEM_TXBUF_FRMLEN_MASK	0x000007ff
#define ZYNQ_GEM_TXBUF_EXHAUSTED	0x08000000
#define ZYNQ_GEM_TXBUF_UNDERRUN		0x10000000

/* Device registers */
struct zynq_gem_regs {
	u32 nwctrl; /* Network Control reg */
	u32 nwcfg; /* Network Config reg */
	u32 nwsr; /* Network Status reg */
	u32 reserved1;
	u32 dmacr; /* DMA Control reg */
	u32 txsr; /* TX Status reg */
	u32 rxqbase; /* RX Q Base address reg */
	u32 txqbase; /* TX Q Base address reg */
	u32 rxsr; /* RX Status reg */
	u32 reserved2[2];
	u32 idr; /* Interrupt Disable reg */
	u32 reserved3;
	u32 phymntnc; /* Phy Maintaince reg */
	u32 reserved4[18];
	u32 hashl; /* Hash Low address reg */
	u32 hashh; /* Hash High address reg */
#define LADDR_LOW	0
#define LADDR_HIGH	1
	u32 laddr[4][LADDR_HIGH + 1]; /* Specific1 addr low/high reg */
	u32 match[4]; /* Type ID1 Match reg */
	u32 reserved6[18];
	u32 stat[44]; /* Octects transmitted Low reg - stat start */
};

/* BD descriptors */
struct emac_bd {
	u32 addr; /* Next descriptor pointer */
	u32 status;
};

#define RX_BUF 3
/* Page table entries are set to 1MB, or multiples of 1MB
 * (not < 1MB). driver uses less bd's so use 1MB bdspace.
 */
#define BD_SPACE	0x100000
/* BD separation space */
#define BD_SEPRN_SPACE	64

/* Initialized, rxbd_current, rx_first_buf must be 0 after init */
struct zynq_gem_priv {
	struct emac_bd *tx_bd;
	struct emac_bd *rx_bd;
	char *rxbuffers;
	u32 rxbd_current;
	u32 rx_first_buf;
	int phyaddr;
	u32 emio;
	int init;
	struct phy_device *phydev;
	struct mii_dev *bus;
};

static inline int mdio_wait(struct eth_device *dev)
{
	struct zynq_gem_regs *regs = (struct zynq_gem_regs *)dev->iobase;
	u32 timeout = 200;

	/* Wait till MDIO interface is ready to accept a new transaction. */
	while (--timeout) {
		if (readl(&regs->nwsr) & ZYNQ_GEM_NWSR_MDIOIDLE_MASK)
			break;
		WATCHDOG_RESET();
	}

	if (!timeout) {
		printf("%s: Timeout\n", __func__);
		return 1;
	}

	return 0;
}

static u32 phy_setup_op(struct eth_device *dev, u32 phy_addr, u32 regnum,
							u32 op, u16 *data)
{
	u32 mgtcr;
	struct zynq_gem_regs *regs = (struct zynq_gem_regs *)dev->iobase;

	if (mdio_wait(dev))
		return 1;

	/* Construct mgtcr mask for the operation */
	mgtcr = ZYNQ_GEM_PHYMNTNC_OP_MASK | op |
		(phy_addr << ZYNQ_GEM_PHYMNTNC_PHYAD_SHIFT_MASK) |
		(regnum << ZYNQ_GEM_PHYMNTNC_PHREG_SHIFT_MASK) | *data;

	/* Write mgtcr and wait for completion */
	writel(mgtcr, &regs->phymntnc);

	if (mdio_wait(dev))
		return 1;

	if (op == ZYNQ_GEM_PHYMNTNC_OP_R_MASK)
		*data = readl(&regs->phymntnc);

	return 0;
}

static u32 phyread(struct eth_device *dev, u32 phy_addr, u32 regnum, u16 *val)
{
	return phy_setup_op(dev, phy_addr, regnum,
				ZYNQ_GEM_PHYMNTNC_OP_R_MASK, val);
}

static u32 phywrite(struct eth_device *dev, u32 phy_addr, u32 regnum, u16 data)
{
	return phy_setup_op(dev, phy_addr, regnum,
				ZYNQ_GEM_PHYMNTNC_OP_W_MASK, &data);
}

static void phy_detection(struct eth_device *dev)
{
	int i;
	u16 phyreg;
	struct zynq_gem_priv *priv = dev->priv;

	if (priv->phyaddr != -1) {
		phyread(dev, priv->phyaddr, PHY_DETECT_REG, &phyreg);
		if ((phyreg != 0xFFFF) &&
		    ((phyreg & PHY_DETECT_MASK) == PHY_DETECT_MASK)) {
			/* Found a valid PHY address */
			debug("Default phy address %d is valid\n",
			      priv->phyaddr);
			return;
		} else {
			debug("PHY address is not setup correctly %d\n",
			      priv->phyaddr);
			priv->phyaddr = -1;
		}
	}

	debug("detecting phy address\n");
	if (priv->phyaddr == -1) {
		/* detect the PHY address */
		for (i = 31; i >= 0; i--) {
			phyread(dev, i, PHY_DETECT_REG, &phyreg);
			if ((phyreg != 0xFFFF) &&
			    ((phyreg & PHY_DETECT_MASK) == PHY_DETECT_MASK)) {
				/* Found a valid PHY address */
				priv->phyaddr = i;
				debug("Found valid phy address, %d\n", i);
				return;
			}
		}
	}
	printf("PHY is not detected\n");
}

static int zynq_gem_setup_mac(struct eth_device *dev)
{
	u32 i, macaddrlow, macaddrhigh;
	struct zynq_gem_regs *regs = (struct zynq_gem_regs *)dev->iobase;

	/* Set the MAC bits [31:0] in BOT */
	macaddrlow = dev->enetaddr[0];
	macaddrlow |= dev->enetaddr[1] << 8;
	macaddrlow |= dev->enetaddr[2] << 16;
	macaddrlow |= dev->enetaddr[3] << 24;

	/* Set MAC bits [47:32] in TOP */
	macaddrhigh = dev->enetaddr[4];
	macaddrhigh |= dev->enetaddr[5] << 8;

	for (i = 0; i < 4; i++) {
		writel(0, &regs->laddr[i][LADDR_LOW]);
		writel(0, &regs->laddr[i][LADDR_HIGH]);
		/* Do not use MATCHx register */
		writel(0, &regs->match[i]);
	}

	writel(macaddrlow, &regs->laddr[0][LADDR_LOW]);
	writel(macaddrhigh, &regs->laddr[0][LADDR_HIGH]);

	return 0;
}

static int zynq_gem_init(struct eth_device *dev, bd_t * bis)
{
	u32 i, rclk, clk = 0;
	struct phy_device *phydev;
	const u32 stat_size = (sizeof(struct zynq_gem_regs) -
				offsetof(struct zynq_gem_regs, stat)) / 4;
	struct zynq_gem_regs *regs = (struct zynq_gem_regs *)dev->iobase;
	struct zynq_gem_priv *priv = dev->priv;
	const u32 supported = SUPPORTED_10baseT_Half |
			SUPPORTED_10baseT_Full |
			SUPPORTED_100baseT_Half |
			SUPPORTED_100baseT_Full |
			SUPPORTED_1000baseT_Half |
			SUPPORTED_1000baseT_Full;

	if (!priv->init) {
		/* Disable all interrupts */
		writel(0xFFFFFFFF, &regs->idr);

		/* Disable the receiver & transmitter */
		writel(0, &regs->nwctrl);
		writel(0, &regs->txsr);
		writel(0, &regs->rxsr);
		writel(0, &regs->phymntnc);

		/* Clear the Hash registers for the mac address
		 * pointed by AddressPtr
		 */
		writel(0x0, &regs->hashl);
		/* Write bits [63:32] in TOP */
		writel(0x0, &regs->hashh);

		/* Clear all counters */
		for (i = 0; i <= stat_size; i++)
			readl(&regs->stat[i]);

		/* Setup RxBD space */
		memset(priv->rx_bd, 0, RX_BUF * sizeof(struct emac_bd));

		for (i = 0; i < RX_BUF; i++) {
			priv->rx_bd[i].status = 0xF0000000;
			priv->rx_bd[i].addr =
					((u32)(priv->rxbuffers) +
							(i * PKTSIZE_ALIGN));
		}
		/* WRAP bit to last BD */
		priv->rx_bd[--i].addr |= ZYNQ_GEM_RXBUF_WRAP_MASK;
		/* Write RxBDs to IP */
		writel((u32)priv->rx_bd, &regs->rxqbase);

		/* Setup for DMA Configuration register */
		writel(ZYNQ_GEM_DMACR_INIT, &regs->dmacr);

		/* Setup for Network Control register, MDIO, Rx and Tx enable */
		setbits_le32(&regs->nwctrl, ZYNQ_GEM_NWCTRL_MDEN_MASK);

		priv->init++;
	}

	phy_detection(dev);

	/* interface - look at tsec */
	phydev = phy_connect(priv->bus, priv->phyaddr, dev, 0);

	phydev->supported = supported | ADVERTISED_Pause |
			    ADVERTISED_Asym_Pause;
	phydev->advertising = phydev->supported;
	priv->phydev = phydev;
	phy_config(phydev);
	phy_startup(phydev);

	switch (phydev->speed) {
	case SPEED_1000:
		writel(ZYNQ_GEM_NWCFG_INIT | ZYNQ_GEM_NWCFG_SPEED1000,
		       &regs->nwcfg);
		rclk = (0 << 4) | (1 << 0);
		clk = (1 << 20) | (8 << 8) | (0 << 4) | (1 << 0);
		break;
	case SPEED_100:
		clrsetbits_le32(&regs->nwcfg, ZYNQ_GEM_NWCFG_SPEED1000,
				ZYNQ_GEM_NWCFG_INIT | ZYNQ_GEM_NWCFG_SPEED100);
		rclk = 1 << 0;
		clk = (5 << 20) | (8 << 8) | (0 << 4) | (1 << 0);
		break;
	case SPEED_10:
		rclk = 1 << 0;
		/* FIXME untested */
		clk = (5 << 20) | (8 << 8) | (0 << 4) | (1 << 0);
		break;
	}

	/* Change the rclk and clk only not using EMIO interface */
	if (!priv->emio)
		zynq_slcr_gem_clk_setup(dev->iobase !=
					ZYNQ_GEM_BASEADDR0, rclk, clk);

	setbits_le32(&regs->nwctrl, ZYNQ_GEM_NWCTRL_RXEN_MASK |
					ZYNQ_GEM_NWCTRL_TXEN_MASK);

	return 0;
}

static int zynq_gem_send(struct eth_device *dev, void *ptr, int len)
{
	u32 addr, size;
	struct zynq_gem_priv *priv = dev->priv;
	struct zynq_gem_regs *regs = (struct zynq_gem_regs *)dev->iobase;

	/* setup BD */
	writel((u32)priv->tx_bd, &regs->txqbase);

	/* Setup Tx BD */
	memset(priv->tx_bd, 0, sizeof(struct emac_bd));

	priv->tx_bd->addr = (u32)ptr;
	priv->tx_bd->status = (len & ZYNQ_GEM_TXBUF_FRMLEN_MASK) |
				ZYNQ_GEM_TXBUF_LAST_MASK;

	addr = (u32) ptr;
	addr &= ~(ARCH_DMA_MINALIGN - 1);
	size = roundup(len, ARCH_DMA_MINALIGN);
	flush_dcache_range(addr, addr + size);
	barrier();

	/* Start transmit */
	setbits_le32(&regs->nwctrl, ZYNQ_GEM_NWCTRL_STARTTX_MASK);

	/* Read TX BD status */
	if (priv->tx_bd->status & ZYNQ_GEM_TXBUF_UNDERRUN)
		printf("TX underrun\n");
	if (priv->tx_bd->status & ZYNQ_GEM_TXBUF_EXHAUSTED)
		printf("TX buffers exhausted in mid frame\n");

	return 0;
}

/* Do not check frame_recd flag in rx_status register 0x20 - just poll BD */
static int zynq_gem_recv(struct eth_device *dev)
{
	int frame_len;
	struct zynq_gem_priv *priv = dev->priv;
	struct emac_bd *current_bd = &priv->rx_bd[priv->rxbd_current];
	struct emac_bd *first_bd;

	if (!(current_bd->addr & ZYNQ_GEM_RXBUF_NEW_MASK))
		return 0;

	if (!(current_bd->status &
			(ZYNQ_GEM_RXBUF_SOF_MASK | ZYNQ_GEM_RXBUF_EOF_MASK))) {
		printf("GEM: SOF or EOF not set for last buffer received!\n");
		return 0;
	}

	frame_len = current_bd->status & ZYNQ_GEM_RXBUF_LEN_MASK;
	if (frame_len) {
		u32 addr = current_bd->addr & ZYNQ_GEM_RXBUF_ADD_MASK;
		addr &= ~(ARCH_DMA_MINALIGN - 1);
		u32 size = roundup(frame_len, ARCH_DMA_MINALIGN);
		invalidate_dcache_range(addr, addr + size);

		NetReceive((u8 *)addr, frame_len);

		if (current_bd->status & ZYNQ_GEM_RXBUF_SOF_MASK)
			priv->rx_first_buf = priv->rxbd_current;
		else {
			current_bd->addr &= ~ZYNQ_GEM_RXBUF_NEW_MASK;
			current_bd->status = 0xF0000000; /* FIXME */
		}

		if (current_bd->status & ZYNQ_GEM_RXBUF_EOF_MASK) {
			first_bd = &priv->rx_bd[priv->rx_first_buf];
			first_bd->addr &= ~ZYNQ_GEM_RXBUF_NEW_MASK;
			first_bd->status = 0xF0000000;
		}

		if ((++priv->rxbd_current) >= RX_BUF)
			priv->rxbd_current = 0;
	}

	return frame_len;
}

static void zynq_gem_halt(struct eth_device *dev)
{
	struct zynq_gem_regs *regs = (struct zynq_gem_regs *)dev->iobase;

	clrsetbits_le32(&regs->nwctrl, ZYNQ_GEM_NWCTRL_RXEN_MASK |
						ZYNQ_GEM_NWCTRL_TXEN_MASK, 0);
}

static int zynq_gem_miiphyread(const char *devname, uchar addr,
							uchar reg, ushort *val)
{
	struct eth_device *dev = eth_get_dev();
	int ret;

	ret = phyread(dev, addr, reg, val);
	debug("%s 0x%x, 0x%x, 0x%x\n", __func__, addr, reg, *val);
	return ret;
}

static int zynq_gem_miiphy_write(const char *devname, uchar addr,
							uchar reg, ushort val)
{
	struct eth_device *dev = eth_get_dev();

	debug("%s 0x%x, 0x%x, 0x%x\n", __func__, addr, reg, val);
	return phywrite(dev, addr, reg, val);
}

int zynq_gem_initialize(bd_t *bis, int base_addr, int phy_addr, u32 emio)
{
	struct eth_device *dev;
	struct zynq_gem_priv *priv;
	void *bd_space;

	dev = calloc(1, sizeof(*dev));
	if (dev == NULL)
		return -1;

	dev->priv = calloc(1, sizeof(struct zynq_gem_priv));
	if (dev->priv == NULL) {
		free(dev);
		return -1;
	}
	priv = dev->priv;

	/* Align rxbuffers to ARCH_DMA_MINALIGN */
	priv->rxbuffers = memalign(ARCH_DMA_MINALIGN, RX_BUF * PKTSIZE_ALIGN);
	memset(priv->rxbuffers, 0, RX_BUF * PKTSIZE_ALIGN);

	/* Align bd_space to 1MB */
	bd_space = memalign(1 << MMU_SECTION_SHIFT, BD_SPACE);
	mmu_set_region_dcache_behaviour((u32)bd_space, BD_SPACE, DCACHE_OFF);

	/* Initialize the bd spaces for tx and rx bd's */
	priv->tx_bd = (struct emac_bd *)bd_space;
	priv->rx_bd = (struct emac_bd *)((u32)bd_space + BD_SEPRN_SPACE);

	priv->phyaddr = phy_addr;
	priv->emio = emio;

	sprintf(dev->name, "Gem.%x", base_addr);

	dev->iobase = base_addr;

	dev->init = zynq_gem_init;
	dev->halt = zynq_gem_halt;
	dev->send = zynq_gem_send;
	dev->recv = zynq_gem_recv;
	dev->write_hwaddr = zynq_gem_setup_mac;

	eth_register(dev);

	miiphy_register(dev->name, zynq_gem_miiphyread, zynq_gem_miiphy_write);
	priv->bus = miiphy_get_dev_by_name(dev->name);

	return 1;
}