aboutsummaryrefslogtreecommitdiffstats
path: root/drivers/net/fs_enet/mac-scc.c
blob: 22a02a76706933938c4b39f09404edaef2d763d7 (plain) (blame)
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
/*
 * Ethernet on Serial Communications Controller (SCC) driver for Motorola MPC8xx and MPC82xx.
 *
 * Copyright (c) 2003 Intracom S.A.
 *  by Pantelis Antoniou <panto@intracom.gr>
 *
 * 2005 (c) MontaVista Software, Inc.
 * Vitaly Bordug <vbordug@ru.mvista.com>
 *
 * This file is licensed under the terms of the GNU General Public License
 * version 2. This program is licensed "as is" without any warranty of any
 * kind, whether express or implied.
 */

#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/types.h>
#include <linux/string.h>
#include <linux/ptrace.h>
#include <linux/errno.h>
#include <linux/ioport.h>
#include <linux/interrupt.h>
#include <linux/init.h>
#include <linux/delay.h>
#include <linux/netdevice.h>
#include <linux/etherdevice.h>
#include <linux/skbuff.h>
#include <linux/spinlock.h>
#include <linux/mii.h>
#include <linux/ethtool.h>
#include <linux/bitops.h>
#include <linux/fs.h>
#include <linux/platform_device.h>
#include <linux/of_platform.h>

#include <asm/irq.h>
#include <asm/uaccess.h>

#ifdef CONFIG_8xx
#include <asm/8xx_immap.h>
#include <asm/pgtable.h>
#include <asm/mpc8xx.h>
#include <asm/cpm1.h>
#endif

#include "fs_enet.h"

/*************************************************/
#if defined(CONFIG_CPM1)
/* for a 8xx __raw_xxx's are sufficient */
#define __fs_out32(addr, x)	__raw_writel(x, addr)
#define __fs_out16(addr, x)	__raw_writew(x, addr)
#define __fs_out8(addr, x)	__raw_writeb(x, addr)
#define __fs_in32(addr)	__raw_readl(addr)
#define __fs_in16(addr)	__raw_readw(addr)
#define __fs_in8(addr)	__raw_readb(addr)
#else
/* for others play it safe */
#define __fs_out32(addr, x)	out_be32(addr, x)
#define __fs_out16(addr, x)	out_be16(addr, x)
#define __fs_in32(addr)	in_be32(addr)
#define __fs_in16(addr)	in_be16(addr)
#define __fs_out8(addr, x)	out_8(addr, x)
#define __fs_in8(addr)	in_8(addr)
#endif

/* write, read, set bits, clear bits */
#define W32(_p, _m, _v) __fs_out32(&(_p)->_m, (_v))
#define R32(_p, _m)     __fs_in32(&(_p)->_m)
#define S32(_p, _m, _v) W32(_p, _m, R32(_p, _m) | (_v))
#define C32(_p, _m, _v) W32(_p, _m, R32(_p, _m) & ~(_v))

#define W16(_p, _m, _v) __fs_out16(&(_p)->_m, (_v))
#define R16(_p, _m)     __fs_in16(&(_p)->_m)
#define S16(_p, _m, _v) W16(_p, _m, R16(_p, _m) | (_v))
#define C16(_p, _m, _v) W16(_p, _m, R16(_p, _m) & ~(_v))

#define W8(_p, _m, _v)  __fs_out8(&(_p)->_m, (_v))
#define R8(_p, _m)      __fs_in8(&(_p)->_m)
#define S8(_p, _m, _v)  W8(_p, _m, R8(_p, _m) | (_v))
#define C8(_p, _m, _v)  W8(_p, _m, R8(_p, _m) & ~(_v))

#define SCC_MAX_MULTICAST_ADDRS	64

/*
 * Delay to wait for SCC reset command to complete (in us)
 */
#define SCC_RESET_DELAY		50

static inline int scc_cr_cmd(struct fs_enet_private *fep, u32 op)
{
	const struct fs_platform_info *fpi = fep->fpi;

	return cpm_command(fpi->cp_command, op);
}

static int do_pd_setup(struct fs_enet_private *fep)
{
	struct platform_device *ofdev = to_platform_device(fep->dev);

	fep->interrupt = of_irq_to_resource(ofdev->dev.of_node, 0, NULL);
	if (fep->interrupt == NO_IRQ)
		return -EINVAL;

	fep->scc.sccp = of_iomap(ofdev->dev.of_node, 0);
	if (!fep->scc.sccp)
		return -EINVAL;

	fep->scc.ep = of_iomap(ofdev->dev.of_node, 1);
	if (!fep->scc.ep) {
		iounmap(fep->scc.sccp);
		return -EINVAL;
	}

	return 0;
}

#define SCC_NAPI_RX_EVENT_MSK	(SCCE_ENET_RXF | SCCE_ENET_RXB)
#define SCC_RX_EVENT		(SCCE_ENET_RXF)
#define SCC_TX_EVENT		(SCCE_ENET_TXB)
#define SCC_ERR_EVENT_MSK	(SCCE_ENET_TXE | SCCE_ENET_BSY)

static int setup_data(struct net_device *dev)
{
	struct fs_enet_private *fep = netdev_priv(dev);

	do_pd_setup(fep);

	fep->scc.hthi = 0;
	fep->scc.htlo = 0;

	fep->ev_napi_rx = SCC_NAPI_RX_EVENT_MSK;
	fep->ev_rx = SCC_RX_EVENT;
	fep->ev_tx = SCC_TX_EVENT | SCCE_ENET_TXE;
	fep->ev_err = SCC_ERR_EVENT_MSK;

	return 0;
}

static int allocate_bd(struct net_device *dev)
{
	struct fs_enet_private *fep = netdev_priv(dev);
	const struct fs_platform_info *fpi = fep->fpi;

	fep->ring_mem_addr = cpm_dpalloc((fpi->tx_ring + fpi->rx_ring) *
					 sizeof(cbd_t), 8);
	if (IS_ERR_VALUE(fep->ring_mem_addr))
		return -ENOMEM;

	fep->ring_base = (void __iomem __force*)
		cpm_dpram_addr(fep->ring_mem_addr);

	return 0;
}

static void free_bd(struct net_device *dev)
{
	struct fs_enet_private *fep = netdev_priv(dev);

	if (fep->ring_base)
		cpm_dpfree(fep->ring_mem_addr);
}

static void cleanup_data(struct net_device *dev)
{
	/* nothing */
}

static void set_promiscuous_mode(struct net_device *dev)
{
	struct fs_enet_private *fep = netdev_priv(dev);
	scc_t __iomem *sccp = fep->scc.sccp;

	S16(sccp, scc_psmr, SCC_PSMR_PRO);
}

static void set_multicast_start(struct net_device *dev)
{
	struct fs_enet_private *fep = netdev_priv(dev);
	scc_enet_t __iomem *ep = fep->scc.ep;

	W16(ep, sen_gaddr1, 0);
	W16(ep, sen_gaddr2, 0);
	W16(ep, sen_gaddr3, 0);
	W16(ep, sen_gaddr4, 0);
}

static void set_multicast_one(struct net_device *dev, const u8 * mac)
{
	struct fs_enet_private *fep = netdev_priv(dev);
	scc_enet_t __iomem *ep = fep->scc.ep;
	u16 taddrh, taddrm, taddrl;

	taddrh = ((u16) mac[5] << 8) | mac[4];
	taddrm = ((u16) mac[3] << 8) | mac[2];
	taddrl = ((u16) mac[1] << 8) | mac[0];

	W16(ep, sen_taddrh, taddrh);
	W16(ep, sen_taddrm, taddrm);
	W16(ep, sen_taddrl, taddrl);
	scc_cr_cmd(fep, CPM_CR_SET_GADDR);
}

static void set_multicast_finish(struct net_device *dev)
{
	struct fs_enet_private *fep = netdev_priv(dev);
	scc_t __iomem *sccp = fep->scc.sccp;
	scc_enet_t __iomem *ep = fep->scc.ep;

	/* clear promiscuous always */
	C16(sccp, scc_psmr, SCC_PSMR_PRO);

	/* if all multi or too many multicasts; just enable all */
	if ((dev->flags & IFF_ALLMULTI) != 0 ||
	    netdev_mc_count(dev) > SCC_MAX_MULTICAST_ADDRS) {

		W16(ep, sen_gaddr1, 0xffff);
		W16(ep, sen_gaddr2, 0xffff);
		W16(ep, sen_gaddr3, 0xffff);
		W16(ep, sen_gaddr4, 0xffff);
	}
}

static void set_multicast_list(struct net_device *dev)
{
	struct netdev_hw_addr *ha;

	if ((dev->flags & IFF_PROMISC) == 0) {
		set_multicast_start(dev);
		netdev_for_each_mc_addr(ha, dev)
			set_multicast_one(dev, ha->addr);
		set_multicast_finish(dev);
	} else
		set_promiscuous_mode(dev);
}

/*
 * This function is called to start or restart the FEC during a link
 * change.  This only happens when switching between half and full
 * duplex.
 */
static void restart(struct net_device *dev)
{
	struct fs_enet_private *fep = netdev_priv(dev);
	scc_t __iomem *sccp = fep->scc.sccp;
	scc_enet_t __iomem *ep = fep->scc.ep;
	const struct fs_platform_info *fpi = fep->fpi;
	u16 paddrh, paddrm, paddrl;
	const unsigned char *mac;
	int i;

	C32(sccp, scc_gsmrl, SCC_GSMRL_ENR | SCC_GSMRL_ENT);

	/* clear everything (slow & steady does it) */
	for (i = 0; i < sizeof(*ep); i++)
		__fs_out8((u8 __iomem *)ep + i, 0);

	/* point to bds */
	W16(ep, sen_genscc.scc_rbase, fep->ring_mem_addr);
	W16(ep, sen_genscc.scc_tbase,
	    fep->ring_mem_addr + sizeof(cbd_t) * fpi->rx_ring);

	/* Initialize function code registers for big-endian.
	 */
#ifndef CONFIG_NOT_COHERENT_CACHE
	W8(ep, sen_genscc.scc_rfcr, SCC_EB | SCC_GBL);
	W8(ep, sen_genscc.scc_tfcr, SCC_EB | SCC_GBL);
#else
	W8(ep, sen_genscc.scc_rfcr, SCC_EB);
	W8(ep, sen_genscc.scc_tfcr, SCC_EB);
#endif

	/* Set maximum bytes per receive buffer.
	 * This appears to be an Ethernet frame size, not the buffer
	 * fragment size.  It must be a multiple of four.
	 */
	W16(ep, sen_genscc.scc_mrblr, 0x5f0);

	/* Set CRC preset and mask.
	 */
	W32(ep, sen_cpres, 0xffffffff);
	W32(ep, sen_cmask, 0xdebb20e3);

	W32(ep, sen_crcec, 0);	/* CRC Error counter */
	W32(ep, sen_alec, 0);	/* alignment error counter */
	W32(ep, sen_disfc, 0);	/* discard frame counter */

	W16(ep, sen_pads, 0x8888);	/* Tx short frame pad character */
	W16(ep, sen_retlim, 15);	/* Retry limit threshold */

	W16(ep, sen_maxflr, 0x5ee);	/* maximum frame length register */

	W16(ep, sen_minflr, PKT_MINBUF_SIZE);	/* minimum frame length register */

	W16(ep, sen_maxd1, 0x000005f0);	/* maximum DMA1 length */
	W16(ep, sen_maxd2, 0x000005f0);	/* maximum DMA2 length */

	/* Clear hash tables.
	 */
	W16(ep, sen_gaddr1, 0);
	W16(ep, sen_gaddr2, 0);
	W16(ep, sen_gaddr3, 0);
	W16(ep, sen_gaddr4, 0);
	W16(ep, sen_iaddr1, 0);
	W16(ep, sen_iaddr2, 0);
	W16(ep, sen_iaddr3, 0);
	W16(ep, sen_iaddr4, 0);

	/* set address
	 */
	mac = dev->dev_addr;
	paddrh = ((u16) mac[5] << 8) | mac[4];
	paddrm = ((u16) mac[3] << 8) | mac[2];
	paddrl = ((u16) mac[1] << 8) | mac[0];

	W16(ep, sen_paddrh, paddrh);
	W16(ep, sen_paddrm, paddrm);
	W16(ep, sen_paddrl, paddrl);

	W16(ep, sen_pper, 0);
	W16(ep, sen_taddrl, 0);
	W16(ep, sen_taddrm, 0);
	W16(ep, sen_taddrh, 0);

	fs_init_bds(dev);

	scc_cr_cmd(fep, CPM_CR_INIT_TRX);

	W16(sccp, scc_scce, 0xffff);

	/* Enable interrupts we wish to service.
	 */
	W16(sccp, scc_sccm, SCCE_ENET_TXE | SCCE_ENET_RXF | SCCE_ENET_TXB);

	/* Set GSMR_H to enable all normal operating modes.
	 * Set GSMR_L to enable Ethernet to MC68160.
	 */
	W32(sccp, scc_gsmrh, 0);
	W32(sccp, scc_gsmrl,
	    SCC_GSMRL_TCI | SCC_GSMRL_TPL_48 | SCC_GSMRL_TPP_10 |
	    SCC_GSMRL_MODE_ENET);

	/* Set sync/delimiters.
	 */
	W16(sccp, scc_dsr, 0xd555);

	/* Set processing mode.  Use Ethernet CRC, catch broadcast, and
	 * start frame search 22 bit times after RENA.
	 */
	W16(sccp, scc_psmr, SCC_PSMR_ENCRC | SCC_PSMR_NIB22);

	/* Set full duplex mode if needed */
	if (fep->phydev->duplex)
		S16(sccp, scc_psmr, SCC_PSMR_LPB | SCC_PSMR_FDE);

	S32(sccp, scc_gsmrl, SCC_GSMRL_ENR | SCC_GSMRL_ENT);
}

static void stop(struct net_device *dev)
{
	struct fs_enet_private *fep = netdev_priv(dev);
	scc_t __iomem *sccp = fep->scc.sccp;
	int i;

	for (i = 0; (R16(sccp, scc_sccm) == 0) && i < SCC_RESET_DELAY; i++)
		udelay(1);

	if (i == SCC_RESET_DELAY)
		dev_warn(fep->dev, "SCC timeout on graceful transmit stop\n");

	W16(sccp, scc_sccm, 0);
	C32(sccp, scc_gsmrl, SCC_GSMRL_ENR | SCC_GSMRL_ENT);

	fs_cleanup_bds(dev);
}

static void napi_clear_rx_event(struct net_device *dev)
{
	struct fs_enet_private *fep = netdev_priv(dev);
	scc_t __iomem *sccp = fep->scc.sccp;

	W16(sccp, scc_scce, SCC_NAPI_RX_EVENT_MSK);
}

static void napi_enable_rx(struct net_device *dev)
{
	struct fs_enet_private *fep = netdev_priv(dev);
	scc_t __iomem *sccp = fep->scc.sccp;

	S16(sccp, scc_sccm, SCC_NAPI_RX_EVENT_MSK);
}

static void napi_disable_rx(struct net_device *dev)
{
	struct fs_enet_private *fep = netdev_priv(dev);
	scc_t __iomem *sccp = fep->scc.sccp;

	C16(sccp, scc_sccm, SCC_NAPI_RX_EVENT_MSK);
}

static void rx_bd_done(struct net_device *dev)
{
	/* nothing */
}

static void tx_kickstart(struct net_device *dev)
{
	/* nothing */
}

static u32 get_int_events(struct net_device *dev)
{
	struct fs_enet_private *fep = netdev_priv(dev);
	scc_t __iomem *sccp = fep->scc.sccp;

	return (u32) R16(sccp, scc_scce);
}

static void clear_int_events(struct net_device *dev, u32 int_events)
{
	struct fs_enet_private *fep = netdev_priv(dev);
	scc_t __iomem *sccp = fep->scc.sccp;

	W16(sccp, scc_scce, int_events & 0xffff);
}

static void ev_error(struct net_device *dev, u32 int_events)
{
	struct fs_enet_private *fep = netdev_priv(dev);

	dev_warn(fep->dev, "SCC ERROR(s) 0x%x\n", int_events);
}

static int get_regs(struct net_device *dev, void *p, int *sizep)
{
	struct fs_enet_private *fep = netdev_priv(dev);

	if (*sizep < sizeof(scc_t) + sizeof(scc_enet_t __iomem *))
		return -EINVAL;

	memcpy_fromio(p, fep->scc.sccp, sizeof(scc_t));
	p = (char *)p + sizeof(scc_t);

	memcpy_fromio(p, fep->scc.ep, sizeof(scc_enet_t __iomem *));

	return 0;
}

static int get_regs_len(struct net_device *dev)
{
	return sizeof(scc_t) + sizeof(scc_enet_t __iomem *);
}

static void tx_restart(struct net_device *dev)
{
	struct fs_enet_private *fep = netdev_priv(dev);

	scc_cr_cmd(fep, CPM_CR_RESTART_TX);
}



/*************************************************************************/

const struct fs_ops fs_scc_ops = {
	.setup_data		= setup_data,
	.cleanup_data		= cleanup_data,
	.set_multicast_list	= set_multicast_list,
	.restart		= restart,
	.stop			= stop,
	.napi_clear_rx_event	= napi_clear_rx_event,
	.napi_enable_rx		= napi_enable_rx,
	.napi_disable_rx	= napi_disable_rx,
	.rx_bd_done		= rx_bd_done,
	.tx_kickstart		= tx_kickstart,
	.get_int_events		= get_int_events,
	.clear_int_events	= clear_int_events,
	.ev_error		= ev_error,
	.get_regs		= get_regs,
	.get_regs_len		= get_regs_len,
	.tx_restart		= tx_restart,
	.allocate_bd		= allocate_bd,
	.free_bd		= free_bd,
};