Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/dtor/input
[linux-2.6] / drivers / net / ixp2000 / ixpdev.c
1 /*
2  * IXP2000 MSF network device driver
3  * Copyright (C) 2004, 2005 Lennert Buytenhek <buytenh@wantstofly.org>
4  * Dedicated to Marija Kulikova.
5  *
6  * This program is free software; you can redistribute it and/or modify
7  * it under the terms of the GNU General Public License as published by
8  * the Free Software Foundation; either version 2 of the License, or
9  * (at your option) any later version.
10  */
11
12 #include <linux/module.h>
13 #include <linux/kernel.h>
14 #include <linux/netdevice.h>
15 #include <linux/etherdevice.h>
16 #include <linux/init.h>
17 #include <linux/moduleparam.h>
18 #include <asm/hardware/uengine.h>
19 #include <asm/mach-types.h>
20 #include <asm/io.h>
21 #include "ixp2400_rx.ucode"
22 #include "ixp2400_tx.ucode"
23 #include "ixpdev_priv.h"
24 #include "ixpdev.h"
25
26 #define DRV_MODULE_VERSION      "0.2"
27
28 static int nds_count;
29 static struct net_device **nds;
30 static int nds_open;
31 static void (*set_port_admin_status)(int port, int up);
32
33 static struct ixpdev_rx_desc * const rx_desc =
34         (struct ixpdev_rx_desc *)(IXP2000_SRAM0_VIRT_BASE + RX_BUF_DESC_BASE);
35 static struct ixpdev_tx_desc * const tx_desc =
36         (struct ixpdev_tx_desc *)(IXP2000_SRAM0_VIRT_BASE + TX_BUF_DESC_BASE);
37 static int tx_pointer;
38
39
40 static int ixpdev_xmit(struct sk_buff *skb, struct net_device *dev)
41 {
42         struct ixpdev_priv *ip = netdev_priv(dev);
43         struct ixpdev_tx_desc *desc;
44         int entry;
45
46         if (unlikely(skb->len > PAGE_SIZE)) {
47                 /* @@@ Count drops.  */
48                 dev_kfree_skb(skb);
49                 return 0;
50         }
51
52         entry = tx_pointer;
53         tx_pointer = (tx_pointer + 1) % TX_BUF_COUNT;
54
55         desc = tx_desc + entry;
56         desc->pkt_length = skb->len;
57         desc->channel = ip->channel;
58
59         skb_copy_and_csum_dev(skb, phys_to_virt(desc->buf_addr));
60         dev_kfree_skb(skb);
61
62         ixp2000_reg_write(RING_TX_PENDING,
63                 TX_BUF_DESC_BASE + (entry * sizeof(struct ixpdev_tx_desc)));
64
65         dev->trans_start = jiffies;
66
67         local_irq_disable();
68         ip->tx_queue_entries++;
69         if (ip->tx_queue_entries == TX_BUF_COUNT_PER_CHAN)
70                 netif_stop_queue(dev);
71         local_irq_enable();
72
73         return 0;
74 }
75
76
77 static int ixpdev_rx(struct net_device *dev, int processed, int budget)
78 {
79         while (processed < budget) {
80                 struct ixpdev_rx_desc *desc;
81                 struct sk_buff *skb;
82                 void *buf;
83                 u32 _desc;
84
85                 _desc = ixp2000_reg_read(RING_RX_DONE);
86                 if (_desc == 0)
87                         return 0;
88
89                 desc = rx_desc +
90                         ((_desc - RX_BUF_DESC_BASE) / sizeof(struct ixpdev_rx_desc));
91                 buf = phys_to_virt(desc->buf_addr);
92
93                 if (desc->pkt_length < 4 || desc->pkt_length > PAGE_SIZE) {
94                         printk(KERN_ERR "ixp2000: rx err, length %d\n",
95                                         desc->pkt_length);
96                         goto err;
97                 }
98
99                 if (desc->channel < 0 || desc->channel >= nds_count) {
100                         printk(KERN_ERR "ixp2000: rx err, channel %d\n",
101                                         desc->channel);
102                         goto err;
103                 }
104
105                 /* @@@ Make FCS stripping configurable.  */
106                 desc->pkt_length -= 4;
107
108                 if (unlikely(!netif_running(nds[desc->channel])))
109                         goto err;
110
111                 skb = dev_alloc_skb(desc->pkt_length + 2);
112                 if (likely(skb != NULL)) {
113                         skb_reserve(skb, 2);
114                         skb_copy_to_linear_data(skb, buf, desc->pkt_length);
115                         skb_put(skb, desc->pkt_length);
116                         skb->protocol = eth_type_trans(skb, nds[desc->channel]);
117
118                         skb->dev->last_rx = jiffies;
119
120                         netif_receive_skb(skb);
121                 }
122
123 err:
124                 ixp2000_reg_write(RING_RX_PENDING, _desc);
125                 processed++;
126         }
127
128         return processed;
129 }
130
131 /* dev always points to nds[0].  */
132 static int ixpdev_poll(struct napi_struct *napi, int budget)
133 {
134         struct ixpdev_priv *ip = container_of(napi, struct ixpdev_priv, napi);
135         struct net_device *dev = ip->dev;
136         int rx;
137
138         rx = 0;
139         do {
140                 ixp2000_reg_write(IXP2000_IRQ_THD_RAW_STATUS_A_0, 0x00ff);
141
142                 rx = ixpdev_rx(dev, rx, budget);
143                 if (rx >= budget)
144                         break;
145         } while (ixp2000_reg_read(IXP2000_IRQ_THD_RAW_STATUS_A_0) & 0x00ff);
146
147         netif_rx_complete(dev, napi);
148         ixp2000_reg_write(IXP2000_IRQ_THD_ENABLE_SET_A_0, 0x00ff);
149
150         return rx;
151 }
152
153 static void ixpdev_tx_complete(void)
154 {
155         int channel;
156         u32 wake;
157
158         wake = 0;
159         while (1) {
160                 struct ixpdev_priv *ip;
161                 u32 desc;
162                 int entry;
163
164                 desc = ixp2000_reg_read(RING_TX_DONE);
165                 if (desc == 0)
166                         break;
167
168                 /* @@@ Check whether entries come back in order.  */
169                 entry = (desc - TX_BUF_DESC_BASE) / sizeof(struct ixpdev_tx_desc);
170                 channel = tx_desc[entry].channel;
171
172                 if (channel < 0 || channel >= nds_count) {
173                         printk(KERN_ERR "ixp2000: txcomp channel index "
174                                         "out of bounds (%d, %.8i, %d)\n",
175                                         channel, (unsigned int)desc, entry);
176                         continue;
177                 }
178
179                 ip = netdev_priv(nds[channel]);
180                 if (ip->tx_queue_entries == TX_BUF_COUNT_PER_CHAN)
181                         wake |= 1 << channel;
182                 ip->tx_queue_entries--;
183         }
184
185         for (channel = 0; wake != 0; channel++) {
186                 if (wake & (1 << channel)) {
187                         netif_wake_queue(nds[channel]);
188                         wake &= ~(1 << channel);
189                 }
190         }
191 }
192
193 static irqreturn_t ixpdev_interrupt(int irq, void *dev_id)
194 {
195         u32 status;
196
197         status = ixp2000_reg_read(IXP2000_IRQ_THD_STATUS_A_0);
198         if (status == 0)
199                 return IRQ_NONE;
200
201         /*
202          * Any of the eight receive units signaled RX?
203          */
204         if (status & 0x00ff) {
205                 struct net_device *dev = nds[0];
206                 struct ixpdev_priv *ip = netdev_priv(dev);
207
208                 ixp2000_reg_wrb(IXP2000_IRQ_THD_ENABLE_CLEAR_A_0, 0x00ff);
209                 if (likely(napi_schedule_prep(&ip->napi))) {
210                         __netif_rx_schedule(dev, &ip->napi);
211                 } else {
212                         printk(KERN_CRIT "ixp2000: irq while polling!!\n");
213                 }
214         }
215
216         /*
217          * Any of the eight transmit units signaled TXdone?
218          */
219         if (status & 0xff00) {
220                 ixp2000_reg_wrb(IXP2000_IRQ_THD_RAW_STATUS_A_0, 0xff00);
221                 ixpdev_tx_complete();
222         }
223
224         return IRQ_HANDLED;
225 }
226
227 #ifdef CONFIG_NET_POLL_CONTROLLER
228 static void ixpdev_poll_controller(struct net_device *dev)
229 {
230         disable_irq(IRQ_IXP2000_THDA0);
231         ixpdev_interrupt(IRQ_IXP2000_THDA0, dev);
232         enable_irq(IRQ_IXP2000_THDA0);
233 }
234 #endif
235
236 static int ixpdev_open(struct net_device *dev)
237 {
238         struct ixpdev_priv *ip = netdev_priv(dev);
239         int err;
240
241         napi_enable(&ip->napi);
242         if (!nds_open++) {
243                 err = request_irq(IRQ_IXP2000_THDA0, ixpdev_interrupt,
244                                         IRQF_SHARED, "ixp2000_eth", nds);
245                 if (err) {
246                         nds_open--;
247                         napi_disable(&ip->napi);
248                         return err;
249                 }
250
251                 ixp2000_reg_write(IXP2000_IRQ_THD_ENABLE_SET_A_0, 0xffff);
252         }
253
254         set_port_admin_status(ip->channel, 1);
255         netif_start_queue(dev);
256
257         return 0;
258 }
259
260 static int ixpdev_close(struct net_device *dev)
261 {
262         struct ixpdev_priv *ip = netdev_priv(dev);
263
264         netif_stop_queue(dev);
265         napi_disable(&ip->napi);
266         set_port_admin_status(ip->channel, 0);
267
268         if (!--nds_open) {
269                 ixp2000_reg_write(IXP2000_IRQ_THD_ENABLE_CLEAR_A_0, 0xffff);
270                 free_irq(IRQ_IXP2000_THDA0, nds);
271         }
272
273         return 0;
274 }
275
276 struct net_device *ixpdev_alloc(int channel, int sizeof_priv)
277 {
278         struct net_device *dev;
279         struct ixpdev_priv *ip;
280
281         dev = alloc_etherdev(sizeof_priv);
282         if (dev == NULL)
283                 return NULL;
284
285         dev->hard_start_xmit = ixpdev_xmit;
286         dev->open = ixpdev_open;
287         dev->stop = ixpdev_close;
288 #ifdef CONFIG_NET_POLL_CONTROLLER
289         dev->poll_controller = ixpdev_poll_controller;
290 #endif
291
292         dev->features |= NETIF_F_SG | NETIF_F_HW_CSUM;
293
294         ip = netdev_priv(dev);
295         ip->dev = dev;
296         netif_napi_add(dev, &ip->napi, ixpdev_poll, 64);
297         ip->channel = channel;
298         ip->tx_queue_entries = 0;
299
300         return dev;
301 }
302
303 int ixpdev_init(int __nds_count, struct net_device **__nds,
304                 void (*__set_port_admin_status)(int port, int up))
305 {
306         int i;
307         int err;
308
309         BUILD_BUG_ON(RX_BUF_COUNT > 192 || TX_BUF_COUNT > 192);
310
311         printk(KERN_INFO "IXP2000 MSF ethernet driver %s\n", DRV_MODULE_VERSION);
312
313         nds_count = __nds_count;
314         nds = __nds;
315         set_port_admin_status = __set_port_admin_status;
316
317         for (i = 0; i < RX_BUF_COUNT; i++) {
318                 void *buf;
319
320                 buf = (void *)get_zeroed_page(GFP_KERNEL);
321                 if (buf == NULL) {
322                         err = -ENOMEM;
323                         while (--i >= 0)
324                                 free_page((unsigned long)phys_to_virt(rx_desc[i].buf_addr));
325                         goto err_out;
326                 }
327                 rx_desc[i].buf_addr = virt_to_phys(buf);
328                 rx_desc[i].buf_length = PAGE_SIZE;
329         }
330
331         /* @@@ Maybe we shouldn't be preallocating TX buffers.  */
332         for (i = 0; i < TX_BUF_COUNT; i++) {
333                 void *buf;
334
335                 buf = (void *)get_zeroed_page(GFP_KERNEL);
336                 if (buf == NULL) {
337                         err = -ENOMEM;
338                         while (--i >= 0)
339                                 free_page((unsigned long)phys_to_virt(tx_desc[i].buf_addr));
340                         goto err_free_rx;
341                 }
342                 tx_desc[i].buf_addr = virt_to_phys(buf);
343         }
344
345         /* 256 entries, ring status set means 'empty', base address 0x0000.  */
346         ixp2000_reg_write(RING_RX_PENDING_BASE, 0x44000000);
347         ixp2000_reg_write(RING_RX_PENDING_HEAD, 0x00000000);
348         ixp2000_reg_write(RING_RX_PENDING_TAIL, 0x00000000);
349
350         /* 256 entries, ring status set means 'full', base address 0x0400.  */
351         ixp2000_reg_write(RING_RX_DONE_BASE, 0x40000400);
352         ixp2000_reg_write(RING_RX_DONE_HEAD, 0x00000000);
353         ixp2000_reg_write(RING_RX_DONE_TAIL, 0x00000000);
354
355         for (i = 0; i < RX_BUF_COUNT; i++) {
356                 ixp2000_reg_write(RING_RX_PENDING,
357                         RX_BUF_DESC_BASE + (i * sizeof(struct ixpdev_rx_desc)));
358         }
359
360         ixp2000_uengine_load(0, &ixp2400_rx);
361         ixp2000_uengine_start_contexts(0, 0xff);
362
363         /* 256 entries, ring status set means 'empty', base address 0x0800.  */
364         ixp2000_reg_write(RING_TX_PENDING_BASE, 0x44000800);
365         ixp2000_reg_write(RING_TX_PENDING_HEAD, 0x00000000);
366         ixp2000_reg_write(RING_TX_PENDING_TAIL, 0x00000000);
367
368         /* 256 entries, ring status set means 'full', base address 0x0c00.  */
369         ixp2000_reg_write(RING_TX_DONE_BASE, 0x40000c00);
370         ixp2000_reg_write(RING_TX_DONE_HEAD, 0x00000000);
371         ixp2000_reg_write(RING_TX_DONE_TAIL, 0x00000000);
372
373         ixp2000_uengine_load(1, &ixp2400_tx);
374         ixp2000_uengine_start_contexts(1, 0xff);
375
376         for (i = 0; i < nds_count; i++) {
377                 err = register_netdev(nds[i]);
378                 if (err) {
379                         while (--i >= 0)
380                                 unregister_netdev(nds[i]);
381                         goto err_free_tx;
382                 }
383         }
384
385         for (i = 0; i < nds_count; i++) {
386                 printk(KERN_INFO "%s: IXP2000 MSF ethernet (port %d), "
387                         "%.2x:%.2x:%.2x:%.2x:%.2x:%.2x.\n", nds[i]->name, i,
388                         nds[i]->dev_addr[0], nds[i]->dev_addr[1],
389                         nds[i]->dev_addr[2], nds[i]->dev_addr[3],
390                         nds[i]->dev_addr[4], nds[i]->dev_addr[5]);
391         }
392
393         return 0;
394
395 err_free_tx:
396         for (i = 0; i < TX_BUF_COUNT; i++)
397                 free_page((unsigned long)phys_to_virt(tx_desc[i].buf_addr));
398
399 err_free_rx:
400         for (i = 0; i < RX_BUF_COUNT; i++)
401                 free_page((unsigned long)phys_to_virt(rx_desc[i].buf_addr));
402
403 err_out:
404         return err;
405
406
407 void ixpdev_deinit(void)
408 {
409         int i;
410
411         /* @@@ Flush out pending packets.  */
412
413         for (i = 0; i < nds_count; i++)
414                 unregister_netdev(nds[i]);
415
416         ixp2000_uengine_stop_contexts(1, 0xff);
417         ixp2000_uengine_stop_contexts(0, 0xff);
418         ixp2000_uengine_reset(0x3);
419
420         for (i = 0; i < TX_BUF_COUNT; i++)
421                 free_page((unsigned long)phys_to_virt(tx_desc[i].buf_addr));
422
423         for (i = 0; i < RX_BUF_COUNT; i++)
424                 free_page((unsigned long)phys_to_virt(rx_desc[i].buf_addr));
425 }