summaryrefslogtreecommitdiffstats
path: root/target/linux/ramips/files/drivers/net/ramips.c
blob: 46def4051a08155e368c1513f43ff45bd912ec37 (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
/*
 *   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; either version 2 of the License, or
 *   (at your option) any later version.
 *
 *   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.
 *
 *   You should have received a copy of the GNU General Public License
 *   along with this program; if not, write to the Free Software
 *   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307, USA.
 *
 *   Copyright (C) 2009 John Crispin <blogic@openwrt.org>
 */

#include <linux/module.h>
#include <linux/version.h>
#include <linux/kernel.h>
#include <linux/types.h>
#include <linux/pci.h>
#include <linux/init.h>
#include <linux/skbuff.h>
#include <linux/if_vlan.h>
#include <linux/if_ether.h>
#include <asm/uaccess.h>
#include <net/sock.h>
#include <asm/uaccess.h>

#include <rt305x.h>
#include <rt305x_regs.h>
#include <eth.h>

#define TX_TIMEOUT (20 * HZ / 100)
#define	MAX_RX_LENGTH	1500

#ifdef CONFIG_RALINK_RT305X
#include "ramips_esw.c"
#endif

static struct net_device * ramips_dev;
static void __iomem *ramips_fe_base = 0;

static inline void
ramips_fe_wr(u32 val, unsigned reg)
{
	__raw_writel(val, ramips_fe_base + reg);
}

static inline u32
ramips_fe_rr(unsigned reg)
{
	return __raw_readl(ramips_fe_base + reg);
}

static int
ramips_alloc_dma(struct net_device *dev)
{
#define phys_to_bus(a)  (a & 0x1FFFFFFF)
	struct raeth_priv *priv = (struct raeth_priv*)netdev_priv(dev);
	int i;

	priv->skb_free_idx = 0;

	/* setup tx ring */
	priv->tx = pci_alloc_consistent(NULL,
		NUM_TX_DESC * sizeof(struct ramips_tx_dma), &priv->phy_tx);
	for(i = 0; i < NUM_TX_DESC; i++)
	{
		memset(&priv->tx[i], 0, sizeof(struct ramips_tx_dma));
		priv->tx[i].txd2 |= TX_DMA_LSO | TX_DMA_DONE;
		priv->tx[i].txd4 &= (TX_DMA_QN_MASK | TX_DMA_PN_MASK);
		priv->tx[i].txd4 |= TX_DMA_QN(3) | TX_DMA_PN(1);
	}
	ramips_fe_wr(phys_to_bus(priv->phy_tx), RAMIPS_TX_BASE_PTR0);
	ramips_fe_wr(NUM_TX_DESC, RAMIPS_TX_MAX_CNT0);
	ramips_fe_wr(0, RAMIPS_TX_CTX_IDX0);
	ramips_fe_wr(RAMIPS_PST_DTX_IDX0, RAMIPS_PDMA_RST_CFG);

	/* setup rx ring */
	priv->rx = pci_alloc_consistent(NULL,
		NUM_RX_DESC * sizeof(struct ramips_rx_dma), &priv->phy_rx);
	memset(priv->rx, 0, sizeof(struct ramips_rx_dma) * NUM_RX_DESC);
	for(i = 0; i < NUM_RX_DESC; i++)
	{
		struct sk_buff *new_skb = dev_alloc_skb(MAX_RX_LENGTH + 2);
		BUG_ON(!new_skb);
		skb_reserve(new_skb, 2);
		priv->rx[i].rxd1 =
			dma_map_single(NULL, skb_put(new_skb, 2), MAX_RX_LENGTH + 2,
				PCI_DMA_FROMDEVICE);
		priv->rx[i].rxd2 |= RX_DMA_LSO;
		priv->rx[i].rxd3 = (unsigned int)new_skb;
	}
	dma_cache_wback_inv((unsigned long)priv->rx,
		NUM_RX_DESC * (sizeof(struct ramips_rx_dma)));

	ramips_fe_wr(phys_to_bus(priv->phy_rx), RAMIPS_RX_BASE_PTR0);
	ramips_fe_wr(NUM_RX_DESC, RAMIPS_RX_MAX_CNT0);
	ramips_fe_wr((NUM_RX_DESC - 1), RAMIPS_RX_CALC_IDX0);
	ramips_fe_wr(RAMIPS_PST_DRX_IDX0, RAMIPS_PDMA_RST_CFG);

	return 0;
}

static int
ramips_eth_hard_start_xmit(struct sk_buff* skb, struct net_device *dev)
{
	struct raeth_priv *priv = (struct raeth_priv*)netdev_priv(dev);
	unsigned long tx;
	unsigned int tx_next;

#ifdef CONFIG_RALINK_RT305X
#define MIN_PKT_LEN  64
	 if(skb->len < MIN_PKT_LEN)
	 {
	     if(skb_padto(skb, MIN_PKT_LEN))
		 {
			 printk(KERN_ERR "ramips_eth: skb_padto failed\n");
			 kfree_skb(skb);
			 return 0;
	     }
	     skb_put(skb, MIN_PKT_LEN - skb->len);
	 }
#endif
	dev->trans_start = jiffies;
	dma_cache_wback_inv((unsigned long)skb->data, skb->len);
	tx = ramips_fe_rr(RAMIPS_TX_CTX_IDX0);
	if(tx == NUM_TX_DESC - 1)
		tx_next = 0;
	else
		tx_next = tx + 1;
	if((priv->tx[tx].txd3 == 0) && (priv->tx[tx_next].txd3 == 0))
	{
		if(!(priv->tx[tx].txd2 & TX_DMA_DONE))
		{
			kfree_skb(skb);
			priv->stat.tx_dropped++;
			printk(KERN_ERR "%s: dropping\n", dev->name);
			return 0;
		}
		priv->tx[tx].txd1 = virt_to_phys(skb->data);
		priv->tx[tx].txd2 &= ~(TX_DMA_PLEN0_MASK | TX_DMA_DONE);
		priv->tx[tx].txd2 |= TX_DMA_PLEN0(skb->len);
		ramips_fe_wr((tx + 1) % NUM_TX_DESC, RAMIPS_TX_CTX_IDX0);
		priv->stat.tx_packets++;
		priv->stat.tx_bytes += skb->len;
		priv->tx[tx].txd3 = (unsigned int)skb;
		ramips_fe_wr((tx + 1) % NUM_TX_DESC, RAMIPS_TX_CTX_IDX0);
	} else {
		priv->stat.tx_dropped++;
		kfree_skb(skb);
	}
	return 0;
}

static void
ramips_eth_rx_hw(unsigned long ptr)
{
	struct net_device *dev = (struct net_device*)ptr;
	struct raeth_priv *priv = (struct raeth_priv*)netdev_priv(dev);
	int rx;
	int max_rx = 16;

	while(max_rx)
	{
		struct sk_buff *rx_skb, *new_skb;

		rx = (ramips_fe_rr(RAMIPS_RX_CALC_IDX0) + 1) % NUM_RX_DESC;
		if(!(priv->rx[rx].rxd2 & RX_DMA_DONE))
			break;
		max_rx--;

		rx_skb = (struct sk_buff*)priv->rx[rx].rxd3;
		rx_skb->len = RX_DMA_PLEN0(priv->rx[rx].rxd2);
		rx_skb->tail = rx_skb->data + rx_skb->len;
		rx_skb->dev = dev;
		rx_skb->protocol = eth_type_trans(rx_skb, dev);
		rx_skb->ip_summed = CHECKSUM_NONE;
		priv->stat.rx_packets++;
		priv->stat.rx_bytes += rx_skb->len;
		netif_rx(rx_skb);

		new_skb = __dev_alloc_skb(MAX_RX_LENGTH + 2, GFP_DMA | GFP_ATOMIC);
		priv->rx[rx].rxd3 = (unsigned int)new_skb;
		BUG_ON(!new_skb);
		skb_reserve(new_skb, 2);
		priv->rx[rx].rxd1 =
			dma_map_single(NULL, new_skb->data, MAX_RX_LENGTH + 2,
			PCI_DMA_FROMDEVICE);
		priv->rx[rx].rxd2 &= ~RX_DMA_DONE;
		dma_cache_wback_inv((unsigned long)&priv->rx[rx],
			sizeof(struct ramips_rx_dma));
		ramips_fe_wr(rx, RAMIPS_RX_CALC_IDX0);
	}
	if(max_rx == 0)
		tasklet_schedule(&priv->rx_tasklet);
	else
		ramips_fe_wr(ramips_fe_rr(RAMIPS_FE_INT_ENABLE) | RAMIPS_RX_DLY_INT,
			RAMIPS_FE_INT_ENABLE);
}

static void
ramips_eth_tx_housekeeping(unsigned long ptr)
{
	struct net_device *dev = (struct net_device*)ptr;
	struct raeth_priv *priv = (struct raeth_priv*)netdev_priv(dev);

	while((priv->tx[priv->skb_free_idx].txd2 & TX_DMA_DONE) &&
		(priv->tx[priv->skb_free_idx].txd3))
	{
		dev_kfree_skb_irq((struct sk_buff*)priv->tx[priv->skb_free_idx].txd3);
		priv->tx[priv->skb_free_idx].txd3 = 0;
		priv->skb_free_idx++;
		if(priv->skb_free_idx >= NUM_TX_DESC)
			priv->skb_free_idx = 0;
	}
	ramips_fe_wr(ramips_fe_rr(RAMIPS_FE_INT_ENABLE) | RAMIPS_TX_DLY_INT,
		RAMIPS_FE_INT_ENABLE);
}

static struct net_device_stats*
ramips_eth_get_stats(struct net_device *dev)
{
	return &((struct raeth_priv*)netdev_priv(dev))->stat;
}

static int
ramips_eth_set_mac_addr(struct net_device *dev, void *priv)
{
	unsigned char *mac = (unsigned char*)priv;

	if(netif_running(dev))
		return -EBUSY;
	memcpy(dev->dev_addr, ((struct sockaddr*)priv)->sa_data, dev->addr_len);
	ramips_fe_wr((mac[0] << 8) | mac[1], RAMIPS_GDMA1_MAC_ADRH);
	ramips_fe_wr(RAMIPS_GDMA1_MAC_ADRL,
		(mac[2] << 24) | (mac[3] << 16) | (mac[4] << 8) | mac[5]);
	return 0;
}

static void
ramips_eth_timeout(struct net_device *dev)
{
	tasklet_schedule(
		&((struct raeth_priv*)netdev_priv(dev))->tx_housekeeping_tasklet);
}

static irqreturn_t
ramips_eth_irq(int irq, void *dev)
{
	struct raeth_priv *priv = (struct raeth_priv*)netdev_priv(dev);
	unsigned long fe_int = ramips_fe_rr(RAMIPS_FE_INT_STATUS);

	if(fe_int & RAMIPS_RX_DLY_INT)
	{
		ramips_fe_wr(ramips_fe_rr(RAMIPS_FE_INT_ENABLE) & ~(RAMIPS_RX_DLY_INT),
			RAMIPS_FE_INT_ENABLE);
		tasklet_schedule(&priv->rx_tasklet);
	}
	if(fe_int & RAMIPS_TX_DLY_INT)
		tasklet_schedule(&priv->tx_housekeeping_tasklet);
	ramips_fe_wr(0xFFFFFFFF, RAMIPS_FE_INT_STATUS);
	return IRQ_HANDLED;
}

static int
ramips_eth_open(struct net_device *dev)
{
	struct raeth_priv *priv = (struct raeth_priv*)netdev_priv(dev);

	ramips_alloc_dma(dev);
	ramips_fe_wr((ramips_fe_rr(RAMIPS_PDMA_GLO_CFG) & 0xff) |
		(RAMIPS_TX_WB_DDONE | RAMIPS_RX_DMA_EN |
		RAMIPS_TX_DMA_EN | RAMIPS_PDMA_SIZE_4DWORDS),
		RAMIPS_PDMA_GLO_CFG);
	ramips_fe_wr((ramips_fe_rr(RAMIPS_FE_GLO_CFG) &
		~(RAMIPS_US_CYC_CNT_MASK << RAMIPS_US_CYC_CNT_SHIFT)) |
		((rt305x_sys_freq / RAMIPS_US_CYC_CNT_DIVISOR) << RAMIPS_US_CYC_CNT_SHIFT),
		RAMIPS_FE_GLO_CFG);
	request_irq(dev->irq, ramips_eth_irq, IRQF_DISABLED, dev->name, dev);
	tasklet_init(&priv->tx_housekeeping_tasklet, ramips_eth_tx_housekeeping,
		(unsigned long)dev);
	tasklet_init(&priv->rx_tasklet, ramips_eth_rx_hw, (unsigned long)dev);
	ramips_fe_wr(RAMIPS_DELAY_INIT, RAMIPS_DLY_INT_CFG);
	ramips_fe_wr(RAMIPS_TX_DLY_INT | RAMIPS_RX_DLY_INT, RAMIPS_FE_INT_ENABLE);
	ramips_fe_wr(ramips_fe_rr(RAMIPS_GDMA1_FWD_CFG) &
		~(RAMIPS_GDM1_ICS_EN | RAMIPS_GDM1_TCS_EN | RAMIPS_GDM1_UCS_EN | 0xffff),
		RAMIPS_GDMA1_FWD_CFG);
	ramips_fe_wr(ramips_fe_rr(RAMIPS_CDMA_CSG_CFG) &
		~(RAMIPS_ICS_GEN_EN | RAMIPS_TCS_GEN_EN | RAMIPS_UCS_GEN_EN),
		RAMIPS_CDMA_CSG_CFG);
	ramips_fe_wr(RAMIPS_PSE_FQFC_CFG_INIT, RAMIPS_PSE_FQ_CFG);
	ramips_fe_wr(1, RAMIPS_FE_RST_GL);
	ramips_fe_wr(0, RAMIPS_FE_RST_GL);
	netif_start_queue(dev);
	return 0;
}

static int
ramips_eth_stop(struct net_device *dev)
{
	struct raeth_priv *priv = (struct raeth_priv*)netdev_priv(dev);

	ramips_fe_wr(RAMIPS_PDMA_GLO_CFG, ramips_fe_rr(RAMIPS_PDMA_GLO_CFG) &
		~(RAMIPS_TX_WB_DDONE | RAMIPS_RX_DMA_EN | RAMIPS_TX_DMA_EN));
	free_irq(dev->irq, dev);
	netif_stop_queue(dev);
	tasklet_kill(&priv->tx_housekeeping_tasklet);
	tasklet_kill(&priv->rx_tasklet);
	pci_free_consistent(NULL, NUM_TX_DESC * sizeof(struct ramips_tx_dma),
		priv->tx, priv->phy_tx);
	pci_free_consistent(NULL, NUM_RX_DESC * sizeof(struct ramips_rx_dma),
		priv->rx, priv->phy_rx);
	printk(KERN_INFO "ramips_eth: stopped\n");
	return 0;
}

int __init
ramips_eth_probe(struct net_device *dev)
{
	struct sockaddr addr;
	unsigned char mac_addr01234[5] = {0x00, 0x0C, 0x43, 0x28, 0x80};

	/* reset frame engine */
	rt305x_sysc_wr(RAMIPS_FE_RESET_BIT, RAMIPS_FE_RESET);
	rt305x_sysc_wr(0, RAMIPS_FE_RESET);

	net_srandom(jiffies);
	memcpy(addr.sa_data, mac_addr01234, 5);
	addr.sa_data[5] = net_random()&0xFF;
	ramips_eth_set_mac_addr(dev, &addr);

	ether_setup(dev);
	dev->open = ramips_eth_open;
	dev->stop = ramips_eth_stop;
	dev->hard_start_xmit = ramips_eth_hard_start_xmit;
	dev->get_stats = ramips_eth_get_stats;
	dev->set_mac_address = ramips_eth_set_mac_addr;
	dev->mtu = MAX_RX_LENGTH;
	dev->tx_timeout = ramips_eth_timeout;
	dev->watchdog_timeo = TX_TIMEOUT;
	return 0;
}

int __init
ramips_eth_init(void)
{
	ramips_fe_base = ioremap_nocache(RT305X_FE_BASE, PAGE_SIZE);
	if(!ramips_fe_base)
		return -ENOMEM;
	ramips_dev = alloc_etherdev(sizeof(struct raeth_priv));
	if(!ramips_dev)
		return -ENOMEM;
	strcpy(ramips_dev->name, "eth%d");
	ramips_dev->irq = RT305X_CPU_IRQ_FE;
	ramips_dev->addr_len = ETH_ALEN;
	ramips_dev->base_addr = (unsigned long)ramips_fe_base;
	ramips_dev->init = ramips_eth_probe;
	if(register_netdev(ramips_dev))
	{
		printk(KERN_ERR "ramips_eth: error bringing up device\n");
		return -ENXIO;
	}
#ifdef CONFIG_RALINK_RT305X
	rt305x_esw_init();
#endif
	printk(KERN_INFO "ramips_eth: loaded\n");
	return 0;
}

void
ramips_eth_cleanup(void)
{
	unregister_netdev(ramips_dev);
	free_netdev(ramips_dev);
	printk(KERN_INFO "ramips_eth: unloaded");
}

module_init(ramips_eth_init);
module_exit(ramips_eth_cleanup);

MODULE_LICENSE("GPL");
MODULE_AUTHOR("John Crispin <blogic@openwrt.org>");
MODULE_DESCRIPTION("ethernet driver for ramips boards");