1 /* $Id: ebus.c,v 1.64 2001/11/08 04:41:33 davem Exp $
2 * ebus.c: PCI to EBus bridge device.
4 * Copyright (C) 1997 Eddie C. Dost (ecd@skynet.be)
5 * Copyright (C) 1999 David S. Miller (davem@redhat.com)
8 #include <linux/module.h>
9 #include <linux/kernel.h>
10 #include <linux/types.h>
11 #include <linux/init.h>
12 #include <linux/slab.h>
13 #include <linux/string.h>
14 #include <linux/interrupt.h>
15 #include <linux/delay.h>
17 #include <asm/system.h>
21 #include <asm/oplib.h>
23 #include <asm/of_device.h>
27 /* EBUS dma library. */
29 #define EBDMA_CSR 0x00UL /* Control/Status */
30 #define EBDMA_ADDR 0x04UL /* DMA Address */
31 #define EBDMA_COUNT 0x08UL /* DMA Count */
33 #define EBDMA_CSR_INT_PEND 0x00000001
34 #define EBDMA_CSR_ERR_PEND 0x00000002
35 #define EBDMA_CSR_DRAIN 0x00000004
36 #define EBDMA_CSR_INT_EN 0x00000010
37 #define EBDMA_CSR_RESET 0x00000080
38 #define EBDMA_CSR_WRITE 0x00000100
39 #define EBDMA_CSR_EN_DMA 0x00000200
40 #define EBDMA_CSR_CYC_PEND 0x00000400
41 #define EBDMA_CSR_DIAG_RD_DONE 0x00000800
42 #define EBDMA_CSR_DIAG_WR_DONE 0x00001000
43 #define EBDMA_CSR_EN_CNT 0x00002000
44 #define EBDMA_CSR_TC 0x00004000
45 #define EBDMA_CSR_DIS_CSR_DRN 0x00010000
46 #define EBDMA_CSR_BURST_SZ_MASK 0x000c0000
47 #define EBDMA_CSR_BURST_SZ_1 0x00080000
48 #define EBDMA_CSR_BURST_SZ_4 0x00000000
49 #define EBDMA_CSR_BURST_SZ_8 0x00040000
50 #define EBDMA_CSR_BURST_SZ_16 0x000c0000
51 #define EBDMA_CSR_DIAG_EN 0x00100000
52 #define EBDMA_CSR_DIS_ERR_PEND 0x00400000
53 #define EBDMA_CSR_TCI_DIS 0x00800000
54 #define EBDMA_CSR_EN_NEXT 0x01000000
55 #define EBDMA_CSR_DMA_ON 0x02000000
56 #define EBDMA_CSR_A_LOADED 0x04000000
57 #define EBDMA_CSR_NA_LOADED 0x08000000
58 #define EBDMA_CSR_DEV_ID_MASK 0xf0000000
60 #define EBUS_DMA_RESET_TIMEOUT 10000
62 static void __ebus_dma_reset(struct ebus_dma_info *p, int no_drain)
67 writel(EBDMA_CSR_RESET, p->regs + EBDMA_CSR);
73 for (i = EBUS_DMA_RESET_TIMEOUT; i > 0; i--) {
74 val = readl(p->regs + EBDMA_CSR);
76 if (!(val & (EBDMA_CSR_DRAIN | EBDMA_CSR_CYC_PEND)))
82 static irqreturn_t ebus_dma_irq(int irq, void *dev_id)
84 struct ebus_dma_info *p = dev_id;
88 spin_lock_irqsave(&p->lock, flags);
89 csr = readl(p->regs + EBDMA_CSR);
90 writel(csr, p->regs + EBDMA_CSR);
91 spin_unlock_irqrestore(&p->lock, flags);
93 if (csr & EBDMA_CSR_ERR_PEND) {
94 printk(KERN_CRIT "ebus_dma(%s): DMA error!\n", p->name);
95 p->callback(p, EBUS_DMA_EVENT_ERROR, p->client_cookie);
97 } else if (csr & EBDMA_CSR_INT_PEND) {
99 (csr & EBDMA_CSR_TC) ?
100 EBUS_DMA_EVENT_DMA : EBUS_DMA_EVENT_DEVICE,
109 int ebus_dma_register(struct ebus_dma_info *p)
115 if (p->flags & ~(EBUS_DMA_FLAG_USE_EBDMA_HANDLER |
116 EBUS_DMA_FLAG_TCI_DISABLE))
118 if ((p->flags & EBUS_DMA_FLAG_USE_EBDMA_HANDLER) && !p->callback)
120 if (!strlen(p->name))
123 __ebus_dma_reset(p, 1);
125 csr = EBDMA_CSR_BURST_SZ_16 | EBDMA_CSR_EN_CNT;
127 if (p->flags & EBUS_DMA_FLAG_TCI_DISABLE)
128 csr |= EBDMA_CSR_TCI_DIS;
130 writel(csr, p->regs + EBDMA_CSR);
134 EXPORT_SYMBOL(ebus_dma_register);
136 int ebus_dma_irq_enable(struct ebus_dma_info *p, int on)
142 if (p->flags & EBUS_DMA_FLAG_USE_EBDMA_HANDLER) {
143 if (request_irq(p->irq, ebus_dma_irq, IRQF_SHARED, p->name, p))
147 spin_lock_irqsave(&p->lock, flags);
148 csr = readl(p->regs + EBDMA_CSR);
149 csr |= EBDMA_CSR_INT_EN;
150 writel(csr, p->regs + EBDMA_CSR);
151 spin_unlock_irqrestore(&p->lock, flags);
153 spin_lock_irqsave(&p->lock, flags);
154 csr = readl(p->regs + EBDMA_CSR);
155 csr &= ~EBDMA_CSR_INT_EN;
156 writel(csr, p->regs + EBDMA_CSR);
157 spin_unlock_irqrestore(&p->lock, flags);
159 if (p->flags & EBUS_DMA_FLAG_USE_EBDMA_HANDLER) {
166 EXPORT_SYMBOL(ebus_dma_irq_enable);
168 void ebus_dma_unregister(struct ebus_dma_info *p)
174 spin_lock_irqsave(&p->lock, flags);
175 csr = readl(p->regs + EBDMA_CSR);
176 if (csr & EBDMA_CSR_INT_EN) {
177 csr &= ~EBDMA_CSR_INT_EN;
178 writel(csr, p->regs + EBDMA_CSR);
181 spin_unlock_irqrestore(&p->lock, flags);
186 EXPORT_SYMBOL(ebus_dma_unregister);
188 int ebus_dma_request(struct ebus_dma_info *p, dma_addr_t bus_addr, size_t len)
194 if (len >= (1 << 24))
197 spin_lock_irqsave(&p->lock, flags);
198 csr = readl(p->regs + EBDMA_CSR);
200 if (!(csr & EBDMA_CSR_EN_DMA))
203 if (csr & EBDMA_CSR_NA_LOADED)
206 writel(len, p->regs + EBDMA_COUNT);
207 writel(bus_addr, p->regs + EBDMA_ADDR);
211 spin_unlock_irqrestore(&p->lock, flags);
215 EXPORT_SYMBOL(ebus_dma_request);
217 void ebus_dma_prepare(struct ebus_dma_info *p, int write)
222 spin_lock_irqsave(&p->lock, flags);
223 __ebus_dma_reset(p, 0);
225 csr = (EBDMA_CSR_INT_EN |
227 EBDMA_CSR_BURST_SZ_16 |
231 csr |= EBDMA_CSR_WRITE;
232 if (p->flags & EBUS_DMA_FLAG_TCI_DISABLE)
233 csr |= EBDMA_CSR_TCI_DIS;
235 writel(csr, p->regs + EBDMA_CSR);
237 spin_unlock_irqrestore(&p->lock, flags);
239 EXPORT_SYMBOL(ebus_dma_prepare);
241 unsigned int ebus_dma_residue(struct ebus_dma_info *p)
243 return readl(p->regs + EBDMA_COUNT);
245 EXPORT_SYMBOL(ebus_dma_residue);
247 unsigned int ebus_dma_addr(struct ebus_dma_info *p)
249 return readl(p->regs + EBDMA_ADDR);
251 EXPORT_SYMBOL(ebus_dma_addr);
253 void ebus_dma_enable(struct ebus_dma_info *p, int on)
258 spin_lock_irqsave(&p->lock, flags);
259 orig_csr = csr = readl(p->regs + EBDMA_CSR);
261 csr |= EBDMA_CSR_EN_DMA;
263 csr &= ~EBDMA_CSR_EN_DMA;
264 if ((orig_csr & EBDMA_CSR_EN_DMA) !=
265 (csr & EBDMA_CSR_EN_DMA))
266 writel(csr, p->regs + EBDMA_CSR);
267 spin_unlock_irqrestore(&p->lock, flags);
269 EXPORT_SYMBOL(ebus_dma_enable);
271 struct linux_ebus *ebus_chain = NULL;
273 static inline void *ebus_alloc(size_t size)
277 mem = kzalloc(size, GFP_ATOMIC);
279 panic("ebus_alloc: out of memory");
283 static void __init fill_ebus_child(struct device_node *dp,
284 struct linux_ebus_child *dev,
285 int non_standard_regs)
287 struct of_device *op;
292 printk(" (%s)", dp->name);
294 regs = of_get_property(dp, "reg", &len);
298 dev->num_addrs = len / sizeof(regs[0]);
300 if (non_standard_regs) {
301 /* This is to handle reg properties which are not
302 * in the parent relative format. One example are
303 * children of the i2c device on CompactPCI systems.
305 * So, for such devices we just record the property
306 * raw in the child resources.
308 for (i = 0; i < dev->num_addrs; i++)
309 dev->resource[i].start = regs[i];
311 for (i = 0; i < dev->num_addrs; i++) {
313 if (rnum >= dev->parent->num_addrs) {
314 prom_printf("UGH: property for %s was %d, need < %d\n",
315 dp->name, len, dev->parent->num_addrs);
318 dev->resource[i].start = dev->parent->resource[i].start;
319 dev->resource[i].end = dev->parent->resource[i].end;
320 dev->resource[i].flags = IORESOURCE_MEM;
321 dev->resource[i].name = dp->name;
325 op = of_find_device_by_node(dp);
329 dev->num_irqs = op->num_irqs;
330 for (i = 0; i < dev->num_irqs; i++)
331 dev->irqs[i] = op->irqs[i];
334 if (!dev->num_irqs) {
336 * Oh, well, some PROMs don't export interrupts
337 * property to children of EBus devices...
339 * Be smart about PS/2 keyboard and mouse.
341 if (!strcmp(dev->parent->prom_node->name, "8042")) {
342 if (!strcmp(dev->prom_node->name, "kb_ps2")) {
344 dev->irqs[0] = dev->parent->irqs[0];
347 dev->irqs[0] = dev->parent->irqs[1];
353 static int __init child_regs_nonstandard(struct linux_ebus_device *dev)
355 if (!strcmp(dev->prom_node->name, "i2c") ||
356 !strcmp(dev->prom_node->name, "SUNW,lombus"))
361 static void __init fill_ebus_device(struct device_node *dp, struct linux_ebus_device *dev)
363 struct linux_ebus_child *child;
364 struct of_device *op;
369 printk(" [%s", dp->name);
371 op = of_find_device_by_node(dp);
376 (void) of_get_property(dp, "reg", &len);
377 dev->num_addrs = len / sizeof(struct linux_prom_registers);
379 for (i = 0; i < dev->num_addrs; i++)
380 memcpy(&dev->resource[i],
382 sizeof(struct resource));
384 dev->num_irqs = op->num_irqs;
385 for (i = 0; i < dev->num_irqs; i++)
386 dev->irqs[i] = op->irqs[i];
389 dev->ofdev.node = dp;
390 dev->ofdev.dev.parent = &dev->bus->ofdev.dev;
391 dev->ofdev.dev.bus = &ebus_bus_type;
392 sprintf(dev->ofdev.dev.bus_id, "ebus[%08x]", dp->node);
394 /* Register with core */
395 if (of_device_register(&dev->ofdev) != 0)
396 printk(KERN_DEBUG "ebus: device registration error for %s!\n",
397 dp->path_component_name);
402 dev->children = ebus_alloc(sizeof(struct linux_ebus_child));
404 child = dev->children;
407 child->bus = dev->bus;
408 fill_ebus_child(dp, child,
409 child_regs_nonstandard(dev));
411 while ((dp = dp->sibling) != NULL) {
412 child->next = ebus_alloc(sizeof(struct linux_ebus_child));
417 child->bus = dev->bus;
418 fill_ebus_child(dp, child,
419 child_regs_nonstandard(dev));
425 static struct pci_dev *find_next_ebus(struct pci_dev *start, int *is_rio_p)
427 struct pci_dev *pdev = start;
429 while ((pdev = pci_get_device(PCI_VENDOR_ID_SUN, PCI_ANY_ID, pdev)))
430 if (pdev->device == PCI_DEVICE_ID_SUN_EBUS ||
431 pdev->device == PCI_DEVICE_ID_SUN_RIO_EBUS)
434 *is_rio_p = !!(pdev && (pdev->device == PCI_DEVICE_ID_SUN_RIO_EBUS));
439 void __init ebus_init(void)
441 struct pci_pbm_info *pbm;
442 struct linux_ebus_device *dev;
443 struct linux_ebus *ebus;
444 struct pci_dev *pdev;
445 struct pcidev_cookie *cookie;
446 struct device_node *dp;
450 pdev = find_next_ebus(NULL, &is_rio);
452 printk("ebus: No EBus's found.\n");
456 cookie = pdev->sysdata;
457 dp = cookie->prom_node;
459 ebus_chain = ebus = ebus_alloc(sizeof(struct linux_ebus));
461 ebus->is_rio = is_rio;
464 struct device_node *child;
466 /* SUNW,pci-qfe uses four empty ebuses on it.
467 I think we should not consider them here,
468 as they have half of the properties this
469 code expects and once we do PCI hot-plug,
470 we'd have to tweak with the ebus_chain
471 in the runtime after initialization. -jj */
473 pdev = find_next_ebus(pdev, &is_rio);
475 if (ebus == ebus_chain) {
477 printk("ebus: No EBus's found.\n");
482 ebus->is_rio = is_rio;
483 cookie = pdev->sysdata;
484 dp = cookie->prom_node;
487 printk("ebus%d:", num_ebus);
489 ebus->index = num_ebus;
490 ebus->prom_node = dp;
492 ebus->parent = pbm = cookie->pbm;
494 ebus->ofdev.node = dp;
495 ebus->ofdev.dev.parent = &pdev->dev;
496 ebus->ofdev.dev.bus = &ebus_bus_type;
497 sprintf(ebus->ofdev.dev.bus_id, "ebus%d", num_ebus);
499 /* Register with core */
500 if (of_device_register(&ebus->ofdev) != 0)
501 printk(KERN_DEBUG "ebus: device registration error for %s!\n",
502 dp->path_component_name);
509 ebus->devices = ebus_alloc(sizeof(struct linux_ebus_device));
513 dev->children = NULL;
515 fill_ebus_device(child, dev);
517 while ((child = child->sibling) != NULL) {
518 dev->next = ebus_alloc(sizeof(struct linux_ebus_device));
522 dev->children = NULL;
524 fill_ebus_device(child, dev);
530 pdev = find_next_ebus(pdev, &is_rio);
534 cookie = pdev->sysdata;
535 dp = cookie->prom_node;
537 ebus->next = ebus_alloc(sizeof(struct linux_ebus));
540 ebus->is_rio = is_rio;
543 pci_dev_put(pdev); /* XXX for the case, when ebusnd is 0, is it OK? */