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15#include <linux/irq.h>
16#include <linux/bootmem.h>
17#include <linux/msi.h>
18#include <linux/pci.h>
19#include <linux/slab.h>
20#include <linux/of_platform.h>
21#include <sysdev/fsl_soc.h>
22#include <asm/prom.h>
23#include <asm/hw_irq.h>
24#include <asm/ppc-pci.h>
25#include <asm/mpic.h>
26#include "fsl_msi.h"
27#include "fsl_pci.h"
28
29LIST_HEAD(msi_head);
30
31struct fsl_msi_feature {
32 u32 fsl_pic_ip;
33 u32 msiir_offset;
34};
35
36struct fsl_msi_cascade_data {
37 struct fsl_msi *msi_data;
38 int index;
39};
40
41static inline u32 fsl_msi_read(u32 __iomem *base, unsigned int reg)
42{
43 return in_be32(base + (reg >> 2));
44}
45
46
47
48
49
50static void fsl_msi_end_irq(unsigned int virq)
51{
52}
53
54static struct irq_chip fsl_msi_chip = {
55 .irq_mask = mask_msi_irq,
56 .irq_unmask = unmask_msi_irq,
57 .ack = fsl_msi_end_irq,
58 .name = "FSL-MSI",
59};
60
61static int fsl_msi_host_map(struct irq_host *h, unsigned int virq,
62 irq_hw_number_t hw)
63{
64 struct fsl_msi *msi_data = h->host_data;
65 struct irq_chip *chip = &fsl_msi_chip;
66
67 irq_to_desc(virq)->status |= IRQ_TYPE_EDGE_FALLING;
68
69 set_irq_chip_data(virq, msi_data);
70 set_irq_chip_and_handler(virq, chip, handle_edge_irq);
71
72 return 0;
73}
74
75static struct irq_host_ops fsl_msi_host_ops = {
76 .map = fsl_msi_host_map,
77};
78
79static int fsl_msi_init_allocator(struct fsl_msi *msi_data)
80{
81 int rc;
82
83 rc = msi_bitmap_alloc(&msi_data->bitmap, NR_MSI_IRQS,
84 msi_data->irqhost->of_node);
85 if (rc)
86 return rc;
87
88 rc = msi_bitmap_reserve_dt_hwirqs(&msi_data->bitmap);
89 if (rc < 0) {
90 msi_bitmap_free(&msi_data->bitmap);
91 return rc;
92 }
93
94 return 0;
95}
96
97static int fsl_msi_check_device(struct pci_dev *pdev, int nvec, int type)
98{
99 if (type == PCI_CAP_ID_MSIX)
100 pr_debug("fslmsi: MSI-X untested, trying anyway.\n");
101
102 return 0;
103}
104
105static void fsl_teardown_msi_irqs(struct pci_dev *pdev)
106{
107 struct msi_desc *entry;
108 struct fsl_msi *msi_data;
109
110 list_for_each_entry(entry, &pdev->msi_list, list) {
111 if (entry->irq == NO_IRQ)
112 continue;
113 msi_data = get_irq_data(entry->irq);
114 set_irq_msi(entry->irq, NULL);
115 msi_bitmap_free_hwirqs(&msi_data->bitmap,
116 virq_to_hw(entry->irq), 1);
117 irq_dispose_mapping(entry->irq);
118 }
119
120 return;
121}
122
123static void fsl_compose_msi_msg(struct pci_dev *pdev, int hwirq,
124 struct msi_msg *msg,
125 struct fsl_msi *fsl_msi_data)
126{
127 struct fsl_msi *msi_data = fsl_msi_data;
128 struct pci_controller *hose = pci_bus_to_host(pdev->bus);
129 u64 base = fsl_pci_immrbar_base(hose);
130
131 msg->address_lo = msi_data->msi_addr_lo + lower_32_bits(base);
132 msg->address_hi = msi_data->msi_addr_hi + upper_32_bits(base);
133
134 msg->data = hwirq;
135
136 pr_debug("%s: allocated srs: %d, ibs: %d\n",
137 __func__, hwirq / IRQS_PER_MSI_REG, hwirq % IRQS_PER_MSI_REG);
138}
139
140static int fsl_setup_msi_irqs(struct pci_dev *pdev, int nvec, int type)
141{
142 int rc, hwirq = -ENOMEM;
143 unsigned int virq;
144 struct msi_desc *entry;
145 struct msi_msg msg;
146 struct fsl_msi *msi_data;
147
148 list_for_each_entry(entry, &pdev->msi_list, list) {
149 list_for_each_entry(msi_data, &msi_head, list) {
150 hwirq = msi_bitmap_alloc_hwirqs(&msi_data->bitmap, 1);
151 if (hwirq >= 0)
152 break;
153 }
154
155 if (hwirq < 0) {
156 rc = hwirq;
157 pr_debug("%s: fail allocating msi interrupt\n",
158 __func__);
159 goto out_free;
160 }
161
162 virq = irq_create_mapping(msi_data->irqhost, hwirq);
163
164 if (virq == NO_IRQ) {
165 pr_debug("%s: fail mapping hwirq 0x%x\n",
166 __func__, hwirq);
167 msi_bitmap_free_hwirqs(&msi_data->bitmap, hwirq, 1);
168 rc = -ENOSPC;
169 goto out_free;
170 }
171 set_irq_data(virq, msi_data);
172 set_irq_msi(virq, entry);
173
174 fsl_compose_msi_msg(pdev, hwirq, &msg, msi_data);
175 write_msi_msg(virq, &msg);
176 }
177 return 0;
178
179out_free:
180
181 return rc;
182}
183
184static void fsl_msi_cascade(unsigned int irq, struct irq_desc *desc)
185{
186 unsigned int cascade_irq;
187 struct fsl_msi *msi_data;
188 int msir_index = -1;
189 u32 msir_value = 0;
190 u32 intr_index;
191 u32 have_shift = 0;
192 struct fsl_msi_cascade_data *cascade_data;
193
194 cascade_data = (struct fsl_msi_cascade_data *)get_irq_data(irq);
195 msi_data = cascade_data->msi_data;
196
197 raw_spin_lock(&desc->lock);
198 if ((msi_data->feature & FSL_PIC_IP_MASK) == FSL_PIC_IP_IPIC) {
199 if (desc->chip->mask_ack)
200 desc->chip->mask_ack(irq);
201 else {
202 desc->chip->mask(irq);
203 desc->chip->ack(irq);
204 }
205 }
206
207 if (unlikely(desc->status & IRQ_INPROGRESS))
208 goto unlock;
209
210 msir_index = cascade_data->index;
211
212 if (msir_index >= NR_MSI_REG)
213 cascade_irq = NO_IRQ;
214
215 desc->status |= IRQ_INPROGRESS;
216 switch (msi_data->feature & FSL_PIC_IP_MASK) {
217 case FSL_PIC_IP_MPIC:
218 msir_value = fsl_msi_read(msi_data->msi_regs,
219 msir_index * 0x10);
220 break;
221 case FSL_PIC_IP_IPIC:
222 msir_value = fsl_msi_read(msi_data->msi_regs, msir_index * 0x4);
223 break;
224 }
225
226 while (msir_value) {
227 intr_index = ffs(msir_value) - 1;
228
229 cascade_irq = irq_linear_revmap(msi_data->irqhost,
230 msir_index * IRQS_PER_MSI_REG +
231 intr_index + have_shift);
232 if (cascade_irq != NO_IRQ)
233 generic_handle_irq(cascade_irq);
234 have_shift += intr_index + 1;
235 msir_value = msir_value >> (intr_index + 1);
236 }
237 desc->status &= ~IRQ_INPROGRESS;
238
239 switch (msi_data->feature & FSL_PIC_IP_MASK) {
240 case FSL_PIC_IP_MPIC:
241 desc->chip->eoi(irq);
242 break;
243 case FSL_PIC_IP_IPIC:
244 if (!(desc->status & IRQ_DISABLED) && desc->chip->unmask)
245 desc->chip->unmask(irq);
246 break;
247 }
248unlock:
249 raw_spin_unlock(&desc->lock);
250}
251
252static int fsl_of_msi_remove(struct platform_device *ofdev)
253{
254 struct fsl_msi *msi = ofdev->dev.platform_data;
255 int virq, i;
256 struct fsl_msi_cascade_data *cascade_data;
257
258 if (msi->list.prev != NULL)
259 list_del(&msi->list);
260 for (i = 0; i < NR_MSI_REG; i++) {
261 virq = msi->msi_virqs[i];
262 if (virq != NO_IRQ) {
263 cascade_data = get_irq_data(virq);
264 kfree(cascade_data);
265 irq_dispose_mapping(virq);
266 }
267 }
268 if (msi->bitmap.bitmap)
269 msi_bitmap_free(&msi->bitmap);
270 iounmap(msi->msi_regs);
271 kfree(msi);
272
273 return 0;
274}
275
276static int __devinit fsl_of_msi_probe(struct platform_device *dev,
277 const struct of_device_id *match)
278{
279 struct fsl_msi *msi;
280 struct resource res;
281 int err, i, count;
282 int rc;
283 int virt_msir;
284 const u32 *p;
285 struct fsl_msi_feature *features = match->data;
286 struct fsl_msi_cascade_data *cascade_data = NULL;
287 int len;
288 u32 offset;
289
290 printk(KERN_DEBUG "Setting up Freescale MSI support\n");
291
292 msi = kzalloc(sizeof(struct fsl_msi), GFP_KERNEL);
293 if (!msi) {
294 dev_err(&dev->dev, "No memory for MSI structure\n");
295 return -ENOMEM;
296 }
297 dev->dev.platform_data = msi;
298
299 msi->irqhost = irq_alloc_host(dev->dev.of_node, IRQ_HOST_MAP_LINEAR,
300 NR_MSI_IRQS, &fsl_msi_host_ops, 0);
301
302 if (msi->irqhost == NULL) {
303 dev_err(&dev->dev, "No memory for MSI irqhost\n");
304 err = -ENOMEM;
305 goto error_out;
306 }
307
308
309 err = of_address_to_resource(dev->dev.of_node, 0, &res);
310 if (err) {
311 dev_err(&dev->dev, "%s resource error!\n",
312 dev->dev.of_node->full_name);
313 goto error_out;
314 }
315
316 msi->msi_regs = ioremap(res.start, res.end - res.start + 1);
317 if (!msi->msi_regs) {
318 dev_err(&dev->dev, "ioremap problem failed\n");
319 goto error_out;
320 }
321
322 msi->feature = features->fsl_pic_ip;
323
324 msi->irqhost->host_data = msi;
325
326 msi->msi_addr_hi = 0x0;
327 msi->msi_addr_lo = features->msiir_offset + (res.start & 0xfffff);
328
329 rc = fsl_msi_init_allocator(msi);
330 if (rc) {
331 dev_err(&dev->dev, "Error allocating MSI bitmap\n");
332 goto error_out;
333 }
334
335 p = of_get_property(dev->dev.of_node, "interrupts", &count);
336 if (!p) {
337 dev_err(&dev->dev, "no interrupts property found on %s\n",
338 dev->dev.of_node->full_name);
339 err = -ENODEV;
340 goto error_out;
341 }
342 if (count % 8 != 0) {
343 dev_err(&dev->dev, "Malformed interrupts property on %s\n",
344 dev->dev.of_node->full_name);
345 err = -EINVAL;
346 goto error_out;
347 }
348 offset = 0;
349 p = of_get_property(dev->dev.of_node, "msi-available-ranges", &len);
350 if (p)
351 offset = *p / IRQS_PER_MSI_REG;
352
353 count /= sizeof(u32);
354 for (i = 0; i < min(count / 2, NR_MSI_REG); i++) {
355 virt_msir = irq_of_parse_and_map(dev->dev.of_node, i);
356 if (virt_msir != NO_IRQ) {
357 cascade_data = kzalloc(
358 sizeof(struct fsl_msi_cascade_data),
359 GFP_KERNEL);
360 if (!cascade_data) {
361 dev_err(&dev->dev,
362 "No memory for MSI cascade data\n");
363 err = -ENOMEM;
364 goto error_out;
365 }
366 msi->msi_virqs[i] = virt_msir;
367 cascade_data->index = i + offset;
368 cascade_data->msi_data = msi;
369 set_irq_data(virt_msir, (void *)cascade_data);
370 set_irq_chained_handler(virt_msir, fsl_msi_cascade);
371 }
372 }
373
374 list_add_tail(&msi->list, &msi_head);
375
376
377 if (!ppc_md.setup_msi_irqs) {
378 ppc_md.setup_msi_irqs = fsl_setup_msi_irqs;
379 ppc_md.teardown_msi_irqs = fsl_teardown_msi_irqs;
380 ppc_md.msi_check_device = fsl_msi_check_device;
381 } else if (ppc_md.setup_msi_irqs != fsl_setup_msi_irqs) {
382 dev_err(&dev->dev, "Different MSI driver already installed!\n");
383 err = -ENODEV;
384 goto error_out;
385 }
386 return 0;
387error_out:
388 fsl_of_msi_remove(dev);
389 return err;
390}
391
392static const struct fsl_msi_feature mpic_msi_feature = {
393 .fsl_pic_ip = FSL_PIC_IP_MPIC,
394 .msiir_offset = 0x140,
395};
396
397static const struct fsl_msi_feature ipic_msi_feature = {
398 .fsl_pic_ip = FSL_PIC_IP_IPIC,
399 .msiir_offset = 0x38,
400};
401
402static const struct of_device_id fsl_of_msi_ids[] = {
403 {
404 .compatible = "fsl,mpic-msi",
405 .data = (void *)&mpic_msi_feature,
406 },
407 {
408 .compatible = "fsl,ipic-msi",
409 .data = (void *)&ipic_msi_feature,
410 },
411 {}
412};
413
414static struct of_platform_driver fsl_of_msi_driver = {
415 .driver = {
416 .name = "fsl-msi",
417 .owner = THIS_MODULE,
418 .of_match_table = fsl_of_msi_ids,
419 },
420 .probe = fsl_of_msi_probe,
421 .remove = fsl_of_msi_remove,
422};
423
424static __init int fsl_of_msi_init(void)
425{
426 return of_register_platform_driver(&fsl_of_msi_driver);
427}
428
429subsys_initcall(fsl_of_msi_init);
430
