4 * Armin Kuster akuster@mvista.com
7 * Copyright 2002 MontaVista Softare Inc.
9 * This program is free software; you can redistribute it and/or modify it
10 * under the terms of the GNU General Public License as published by the
11 * Free Software Foundation; either version 2 of the License, or (at your
12 * option) any later version.
15 #include <linux/config.h>
16 #include <linux/module.h>
17 #include <linux/kernel.h>
18 #include <linux/errno.h>
19 #include <linux/netdevice.h>
20 #include <linux/init.h>
21 #include <linux/dma-mapping.h>
27 #include "ibm_emac_mal.h"
29 // Locking: Should we share a lock with the client ? The client could provide
30 // a lock pointer (optionally) in the commac structure... I don't think this is
31 // really necessary though
33 /* This lock protects the commac list. On today UP implementations, it's
34 * really only used as IRQ protection in mal_{register,unregister}_commac()
36 static DEFINE_RWLOCK(mal_list_lock);
38 int mal_register_commac(struct ibm_ocp_mal *mal, struct mal_commac *commac)
42 write_lock_irqsave(&mal_list_lock, flags);
44 /* Don't let multiple commacs claim the same channel */
45 if ((mal->tx_chan_mask & commac->tx_chan_mask) ||
46 (mal->rx_chan_mask & commac->rx_chan_mask)) {
47 write_unlock_irqrestore(&mal_list_lock, flags);
51 mal->tx_chan_mask |= commac->tx_chan_mask;
52 mal->rx_chan_mask |= commac->rx_chan_mask;
54 list_add(&commac->list, &mal->commac);
56 write_unlock_irqrestore(&mal_list_lock, flags);
61 int mal_unregister_commac(struct ibm_ocp_mal *mal, struct mal_commac *commac)
65 write_lock_irqsave(&mal_list_lock, flags);
67 mal->tx_chan_mask &= ~commac->tx_chan_mask;
68 mal->rx_chan_mask &= ~commac->rx_chan_mask;
70 list_del_init(&commac->list);
72 write_unlock_irqrestore(&mal_list_lock, flags);
77 int mal_set_rcbs(struct ibm_ocp_mal *mal, int channel, unsigned long size)
81 set_mal_dcrn(mal, DCRN_MALRCBS0, size);
85 set_mal_dcrn(mal, DCRN_MALRCBS1, size);
90 set_mal_dcrn(mal, DCRN_MALRCBS2, size);
95 set_mal_dcrn(mal, DCRN_MALRCBS3, size);
105 static irqreturn_t mal_serr(int irq, void *dev_instance, struct pt_regs *regs)
107 struct ibm_ocp_mal *mal = dev_instance;
108 unsigned long mal_error;
111 * This SERR applies to one of the devices on the MAL, here we charge
112 * it against the first EMAC registered for the MAL.
115 mal_error = get_mal_dcrn(mal, DCRN_MALESR);
117 printk(KERN_ERR "%s: System Error (MALESR=%lx)\n",
118 "MAL" /* FIXME: get the name right */ , mal_error);
120 /* FIXME: decipher error */
121 /* DIXME: distribute to commacs, if possible */
123 /* Clear the error status register */
124 set_mal_dcrn(mal, DCRN_MALESR, mal_error);
129 static irqreturn_t mal_txeob(int irq, void *dev_instance, struct pt_regs *regs)
131 struct ibm_ocp_mal *mal = dev_instance;
135 isr = get_mal_dcrn(mal, DCRN_MALTXEOBISR);
136 set_mal_dcrn(mal, DCRN_MALTXEOBISR, isr);
138 read_lock(&mal_list_lock);
139 list_for_each(l, &mal->commac) {
140 struct mal_commac *mc = list_entry(l, struct mal_commac, list);
142 if (isr & mc->tx_chan_mask) {
143 mc->ops->txeob(mc->dev, isr & mc->tx_chan_mask);
146 read_unlock(&mal_list_lock);
151 static irqreturn_t mal_rxeob(int irq, void *dev_instance, struct pt_regs *regs)
153 struct ibm_ocp_mal *mal = dev_instance;
157 isr = get_mal_dcrn(mal, DCRN_MALRXEOBISR);
158 set_mal_dcrn(mal, DCRN_MALRXEOBISR, isr);
160 read_lock(&mal_list_lock);
161 list_for_each(l, &mal->commac) {
162 struct mal_commac *mc = list_entry(l, struct mal_commac, list);
164 if (isr & mc->rx_chan_mask) {
165 mc->ops->rxeob(mc->dev, isr & mc->rx_chan_mask);
168 read_unlock(&mal_list_lock);
173 static irqreturn_t mal_txde(int irq, void *dev_instance, struct pt_regs *regs)
175 struct ibm_ocp_mal *mal = dev_instance;
179 deir = get_mal_dcrn(mal, DCRN_MALTXDEIR);
181 /* FIXME: print which MAL correctly */
182 printk(KERN_WARNING "%s: Tx descriptor error (MALTXDEIR=%lx)\n",
185 read_lock(&mal_list_lock);
186 list_for_each(l, &mal->commac) {
187 struct mal_commac *mc = list_entry(l, struct mal_commac, list);
189 if (deir & mc->tx_chan_mask) {
190 mc->ops->txde(mc->dev, deir & mc->tx_chan_mask);
193 read_unlock(&mal_list_lock);
199 * This interrupt should be very rare at best. This occurs when
200 * the hardware has a problem with the receive descriptors. The manual
201 * states that it occurs when the hardware cannot the receive descriptor
202 * empty bit is not set. The recovery mechanism will be to
203 * traverse through the descriptors, handle any that are marked to be
204 * handled and reinitialize each along the way. At that point the driver
207 static irqreturn_t mal_rxde(int irq, void *dev_instance, struct pt_regs *regs)
209 struct ibm_ocp_mal *mal = dev_instance;
213 deir = get_mal_dcrn(mal, DCRN_MALRXDEIR);
216 * This really is needed. This case encountered in stress testing.
221 /* FIXME: print which MAL correctly */
222 printk(KERN_WARNING "%s: Rx descriptor error (MALRXDEIR=%lx)\n",
225 read_lock(&mal_list_lock);
226 list_for_each(l, &mal->commac) {
227 struct mal_commac *mc = list_entry(l, struct mal_commac, list);
229 if (deir & mc->rx_chan_mask) {
230 mc->ops->rxde(mc->dev, deir & mc->rx_chan_mask);
233 read_unlock(&mal_list_lock);
238 static int __init mal_probe(struct ocp_device *ocpdev)
240 struct ibm_ocp_mal *mal = NULL;
241 struct ocp_func_mal_data *maldata;
244 maldata = (struct ocp_func_mal_data *)ocpdev->def->additions;
245 if (maldata == NULL) {
246 printk(KERN_ERR "mal%d: Missing additional datas !\n",
251 mal = kmalloc(sizeof(struct ibm_ocp_mal), GFP_KERNEL);
254 "mal%d: Out of memory allocating MAL structure !\n",
258 memset(mal, 0, sizeof(*mal));
260 switch (ocpdev->def->index) {
262 mal->dcrbase = DCRN_MAL_BASE;
264 #ifdef DCRN_MAL1_BASE
266 mal->dcrbase = DCRN_MAL1_BASE;
273 /**************************/
275 INIT_LIST_HEAD(&mal->commac);
277 set_mal_dcrn(mal, DCRN_MALRXCARR, 0xFFFFFFFF);
278 set_mal_dcrn(mal, DCRN_MALTXCARR, 0xFFFFFFFF);
280 set_mal_dcrn(mal, DCRN_MALCR, MALCR_MMSR); /* 384 */
281 /* FIXME: Add delay */
283 /* Set the MAL configuration register */
284 set_mal_dcrn(mal, DCRN_MALCR,
285 MALCR_PLBB | MALCR_OPBBL | MALCR_LEA |
286 MALCR_PLBLT_DEFAULT);
288 /* It would be nice to allocate buffers separately for each
289 * channel, but we can't because the channels share the upper
290 * 13 bits of address lines. Each channels buffer must also
291 * be 4k aligned, so we allocate 4k for each channel. This is
292 * inefficient FIXME: do better, if possible */
293 mal->tx_virt_addr = dma_alloc_coherent(&ocpdev->dev,
295 maldata->num_tx_chans,
296 &mal->tx_phys_addr, GFP_KERNEL);
297 if (mal->tx_virt_addr == NULL) {
299 "mal%d: Out of memory allocating MAL descriptors !\n",
305 /* God, oh, god, I hate DCRs */
306 set_mal_dcrn(mal, DCRN_MALTXCTP0R, mal->tx_phys_addr);
307 #ifdef DCRN_MALTXCTP1R
308 if (maldata->num_tx_chans > 1)
309 set_mal_dcrn(mal, DCRN_MALTXCTP1R,
310 mal->tx_phys_addr + MAL_DT_ALIGN);
311 #endif /* DCRN_MALTXCTP1R */
312 #ifdef DCRN_MALTXCTP2R
313 if (maldata->num_tx_chans > 2)
314 set_mal_dcrn(mal, DCRN_MALTXCTP2R,
315 mal->tx_phys_addr + 2 * MAL_DT_ALIGN);
316 #endif /* DCRN_MALTXCTP2R */
317 #ifdef DCRN_MALTXCTP3R
318 if (maldata->num_tx_chans > 3)
319 set_mal_dcrn(mal, DCRN_MALTXCTP3R,
320 mal->tx_phys_addr + 3 * MAL_DT_ALIGN);
321 #endif /* DCRN_MALTXCTP3R */
322 #ifdef DCRN_MALTXCTP4R
323 if (maldata->num_tx_chans > 4)
324 set_mal_dcrn(mal, DCRN_MALTXCTP4R,
325 mal->tx_phys_addr + 4 * MAL_DT_ALIGN);
326 #endif /* DCRN_MALTXCTP4R */
327 #ifdef DCRN_MALTXCTP5R
328 if (maldata->num_tx_chans > 5)
329 set_mal_dcrn(mal, DCRN_MALTXCTP5R,
330 mal->tx_phys_addr + 5 * MAL_DT_ALIGN);
331 #endif /* DCRN_MALTXCTP5R */
332 #ifdef DCRN_MALTXCTP6R
333 if (maldata->num_tx_chans > 6)
334 set_mal_dcrn(mal, DCRN_MALTXCTP6R,
335 mal->tx_phys_addr + 6 * MAL_DT_ALIGN);
336 #endif /* DCRN_MALTXCTP6R */
337 #ifdef DCRN_MALTXCTP7R
338 if (maldata->num_tx_chans > 7)
339 set_mal_dcrn(mal, DCRN_MALTXCTP7R,
340 mal->tx_phys_addr + 7 * MAL_DT_ALIGN);
341 #endif /* DCRN_MALTXCTP7R */
343 mal->rx_virt_addr = dma_alloc_coherent(&ocpdev->dev,
345 maldata->num_rx_chans,
346 &mal->rx_phys_addr, GFP_KERNEL);
348 set_mal_dcrn(mal, DCRN_MALRXCTP0R, mal->rx_phys_addr);
349 #ifdef DCRN_MALRXCTP1R
350 if (maldata->num_rx_chans > 1)
351 set_mal_dcrn(mal, DCRN_MALRXCTP1R,
352 mal->rx_phys_addr + MAL_DT_ALIGN);
353 #endif /* DCRN_MALRXCTP1R */
354 #ifdef DCRN_MALRXCTP2R
355 if (maldata->num_rx_chans > 2)
356 set_mal_dcrn(mal, DCRN_MALRXCTP2R,
357 mal->rx_phys_addr + 2 * MAL_DT_ALIGN);
358 #endif /* DCRN_MALRXCTP2R */
359 #ifdef DCRN_MALRXCTP3R
360 if (maldata->num_rx_chans > 3)
361 set_mal_dcrn(mal, DCRN_MALRXCTP3R,
362 mal->rx_phys_addr + 3 * MAL_DT_ALIGN);
363 #endif /* DCRN_MALRXCTP3R */
365 err = request_irq(maldata->serr_irq, mal_serr, 0, "MAL SERR", mal);
368 err = request_irq(maldata->txde_irq, mal_txde, 0, "MAL TX DE ", mal);
371 err = request_irq(maldata->txeob_irq, mal_txeob, 0, "MAL TX EOB", mal);
374 err = request_irq(maldata->rxde_irq, mal_rxde, 0, "MAL RX DE", mal);
377 err = request_irq(maldata->rxeob_irq, mal_rxeob, 0, "MAL RX EOB", mal);
381 set_mal_dcrn(mal, DCRN_MALIER,
382 MALIER_DE | MALIER_NE | MALIER_TE |
383 MALIER_OPBE | MALIER_PLBE);
385 /* Advertise me to the rest of the world */
386 ocp_set_drvdata(ocpdev, mal);
388 printk(KERN_INFO "mal%d: Initialized, %d tx channels, %d rx channels\n",
389 ocpdev->def->index, maldata->num_tx_chans,
390 maldata->num_rx_chans);
395 /* FIXME: dispose requested IRQs ! */
401 static void __exit mal_remove(struct ocp_device *ocpdev)
403 struct ibm_ocp_mal *mal = ocp_get_drvdata(ocpdev);
404 struct ocp_func_mal_data *maldata = ocpdev->def->additions;
408 ocp_set_drvdata(ocpdev, NULL);
410 /* FIXME: shut down the MAL, deal with dependency with emac */
411 free_irq(maldata->serr_irq, mal);
412 free_irq(maldata->txde_irq, mal);
413 free_irq(maldata->txeob_irq, mal);
414 free_irq(maldata->rxde_irq, mal);
415 free_irq(maldata->rxeob_irq, mal);
417 if (mal->tx_virt_addr)
418 dma_free_coherent(&ocpdev->dev,
419 MAL_DT_ALIGN * maldata->num_tx_chans,
420 mal->tx_virt_addr, mal->tx_phys_addr);
422 if (mal->rx_virt_addr)
423 dma_free_coherent(&ocpdev->dev,
424 MAL_DT_ALIGN * maldata->num_rx_chans,
425 mal->rx_virt_addr, mal->rx_phys_addr);
430 /* Structure for a device driver */
431 static struct ocp_device_id mal_ids[] = {
432 {.vendor = OCP_ANY_ID,.function = OCP_FUNC_MAL},
433 {.vendor = OCP_VENDOR_INVALID}
436 static struct ocp_driver mal_driver = {
441 .remove = mal_remove,
444 static int __init init_mals(void)
448 rc = ocp_register_driver(&mal_driver);
450 ocp_unregister_driver(&mal_driver);
457 static void __exit exit_mals(void)
459 ocp_unregister_driver(&mal_driver);
462 module_init(init_mals);
463 module_exit(exit_mals);