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/config.h>
9 #include <linux/module.h>
10 #include <linux/kernel.h>
11 #include <linux/types.h>
12 #include <linux/init.h>
13 #include <linux/slab.h>
14 #include <linux/string.h>
15 #include <linux/interrupt.h>
16 #include <linux/delay.h>
18 #include <asm/system.h>
22 #include <asm/oplib.h>
24 #include <asm/of_device.h>
28 /* EBUS dma library. */
30 #define EBDMA_CSR 0x00UL /* Control/Status */
31 #define EBDMA_ADDR 0x04UL /* DMA Address */
32 #define EBDMA_COUNT 0x08UL /* DMA Count */
34 #define EBDMA_CSR_INT_PEND 0x00000001
35 #define EBDMA_CSR_ERR_PEND 0x00000002
36 #define EBDMA_CSR_DRAIN 0x00000004
37 #define EBDMA_CSR_INT_EN 0x00000010
38 #define EBDMA_CSR_RESET 0x00000080
39 #define EBDMA_CSR_WRITE 0x00000100
40 #define EBDMA_CSR_EN_DMA 0x00000200
41 #define EBDMA_CSR_CYC_PEND 0x00000400
42 #define EBDMA_CSR_DIAG_RD_DONE 0x00000800
43 #define EBDMA_CSR_DIAG_WR_DONE 0x00001000
44 #define EBDMA_CSR_EN_CNT 0x00002000
45 #define EBDMA_CSR_TC 0x00004000
46 #define EBDMA_CSR_DIS_CSR_DRN 0x00010000
47 #define EBDMA_CSR_BURST_SZ_MASK 0x000c0000
48 #define EBDMA_CSR_BURST_SZ_1 0x00080000
49 #define EBDMA_CSR_BURST_SZ_4 0x00000000
50 #define EBDMA_CSR_BURST_SZ_8 0x00040000
51 #define EBDMA_CSR_BURST_SZ_16 0x000c0000
52 #define EBDMA_CSR_DIAG_EN 0x00100000
53 #define EBDMA_CSR_DIS_ERR_PEND 0x00400000
54 #define EBDMA_CSR_TCI_DIS 0x00800000
55 #define EBDMA_CSR_EN_NEXT 0x01000000
56 #define EBDMA_CSR_DMA_ON 0x02000000
57 #define EBDMA_CSR_A_LOADED 0x04000000
58 #define EBDMA_CSR_NA_LOADED 0x08000000
59 #define EBDMA_CSR_DEV_ID_MASK 0xf0000000
61 #define EBUS_DMA_RESET_TIMEOUT 10000
63 static void __ebus_dma_reset(struct ebus_dma_info *p, int no_drain)
68 writel(EBDMA_CSR_RESET, p->regs + EBDMA_CSR);
74 for (i = EBUS_DMA_RESET_TIMEOUT; i > 0; i--) {
75 val = readl(p->regs + EBDMA_CSR);
77 if (!(val & (EBDMA_CSR_DRAIN | EBDMA_CSR_CYC_PEND)))
83 static irqreturn_t ebus_dma_irq(int irq, void *dev_id, struct pt_regs *regs)
85 struct ebus_dma_info *p = dev_id;
89 spin_lock_irqsave(&p->lock, flags);
90 csr = readl(p->regs + EBDMA_CSR);
91 writel(csr, p->regs + EBDMA_CSR);
92 spin_unlock_irqrestore(&p->lock, flags);
94 if (csr & EBDMA_CSR_ERR_PEND) {
95 printk(KERN_CRIT "ebus_dma(%s): DMA error!\n", p->name);
96 p->callback(p, EBUS_DMA_EVENT_ERROR, p->client_cookie);
98 } else if (csr & EBDMA_CSR_INT_PEND) {
100 (csr & EBDMA_CSR_TC) ?
101 EBUS_DMA_EVENT_DMA : EBUS_DMA_EVENT_DEVICE,
110 int ebus_dma_register(struct ebus_dma_info *p)
116 if (p->flags & ~(EBUS_DMA_FLAG_USE_EBDMA_HANDLER |
117 EBUS_DMA_FLAG_TCI_DISABLE))
119 if ((p->flags & EBUS_DMA_FLAG_USE_EBDMA_HANDLER) && !p->callback)
121 if (!strlen(p->name))
124 __ebus_dma_reset(p, 1);
126 csr = EBDMA_CSR_BURST_SZ_16 | EBDMA_CSR_EN_CNT;
128 if (p->flags & EBUS_DMA_FLAG_TCI_DISABLE)
129 csr |= EBDMA_CSR_TCI_DIS;
131 writel(csr, p->regs + EBDMA_CSR);
135 EXPORT_SYMBOL(ebus_dma_register);
137 int ebus_dma_irq_enable(struct ebus_dma_info *p, int on)
143 if (p->flags & EBUS_DMA_FLAG_USE_EBDMA_HANDLER) {
144 if (request_irq(p->irq, ebus_dma_irq, SA_SHIRQ, p->name, p))
148 spin_lock_irqsave(&p->lock, flags);
149 csr = readl(p->regs + EBDMA_CSR);
150 csr |= EBDMA_CSR_INT_EN;
151 writel(csr, p->regs + EBDMA_CSR);
152 spin_unlock_irqrestore(&p->lock, flags);
154 spin_lock_irqsave(&p->lock, flags);
155 csr = readl(p->regs + EBDMA_CSR);
156 csr &= ~EBDMA_CSR_INT_EN;
157 writel(csr, p->regs + EBDMA_CSR);
158 spin_unlock_irqrestore(&p->lock, flags);
160 if (p->flags & EBUS_DMA_FLAG_USE_EBDMA_HANDLER) {
167 EXPORT_SYMBOL(ebus_dma_irq_enable);
169 void ebus_dma_unregister(struct ebus_dma_info *p)
175 spin_lock_irqsave(&p->lock, flags);
176 csr = readl(p->regs + EBDMA_CSR);
177 if (csr & EBDMA_CSR_INT_EN) {
178 csr &= ~EBDMA_CSR_INT_EN;
179 writel(csr, p->regs + EBDMA_CSR);
182 spin_unlock_irqrestore(&p->lock, flags);
187 EXPORT_SYMBOL(ebus_dma_unregister);
189 int ebus_dma_request(struct ebus_dma_info *p, dma_addr_t bus_addr, size_t len)
195 if (len >= (1 << 24))
198 spin_lock_irqsave(&p->lock, flags);
199 csr = readl(p->regs + EBDMA_CSR);
201 if (!(csr & EBDMA_CSR_EN_DMA))
204 if (csr & EBDMA_CSR_NA_LOADED)
207 writel(len, p->regs + EBDMA_COUNT);
208 writel(bus_addr, p->regs + EBDMA_ADDR);
212 spin_unlock_irqrestore(&p->lock, flags);
216 EXPORT_SYMBOL(ebus_dma_request);
218 void ebus_dma_prepare(struct ebus_dma_info *p, int write)
223 spin_lock_irqsave(&p->lock, flags);
224 __ebus_dma_reset(p, 0);
226 csr = (EBDMA_CSR_INT_EN |
228 EBDMA_CSR_BURST_SZ_16 |
232 csr |= EBDMA_CSR_WRITE;
233 if (p->flags & EBUS_DMA_FLAG_TCI_DISABLE)
234 csr |= EBDMA_CSR_TCI_DIS;
236 writel(csr, p->regs + EBDMA_CSR);
238 spin_unlock_irqrestore(&p->lock, flags);
240 EXPORT_SYMBOL(ebus_dma_prepare);
242 unsigned int ebus_dma_residue(struct ebus_dma_info *p)
244 return readl(p->regs + EBDMA_COUNT);
246 EXPORT_SYMBOL(ebus_dma_residue);
248 unsigned int ebus_dma_addr(struct ebus_dma_info *p)
250 return readl(p->regs + EBDMA_ADDR);
252 EXPORT_SYMBOL(ebus_dma_addr);
254 void ebus_dma_enable(struct ebus_dma_info *p, int on)
259 spin_lock_irqsave(&p->lock, flags);
260 orig_csr = csr = readl(p->regs + EBDMA_CSR);
262 csr |= EBDMA_CSR_EN_DMA;
264 csr &= ~EBDMA_CSR_EN_DMA;
265 if ((orig_csr & EBDMA_CSR_EN_DMA) !=
266 (csr & EBDMA_CSR_EN_DMA))
267 writel(csr, p->regs + EBDMA_CSR);
268 spin_unlock_irqrestore(&p->lock, flags);
270 EXPORT_SYMBOL(ebus_dma_enable);
272 struct linux_ebus *ebus_chain = NULL;
274 static inline void *ebus_alloc(size_t size)
278 mem = kzalloc(size, GFP_ATOMIC);
280 panic("ebus_alloc: out of memory");
284 static void __init fill_ebus_child(struct device_node *dp,
285 struct linux_ebus_child *dev,
286 int non_standard_regs)
288 struct of_device *op;
293 printk(" (%s)", dp->name);
295 regs = of_get_property(dp, "reg", &len);
299 dev->num_addrs = len / sizeof(regs[0]);
301 if (non_standard_regs) {
302 /* This is to handle reg properties which are not
303 * in the parent relative format. One example are
304 * children of the i2c device on CompactPCI systems.
306 * So, for such devices we just record the property
307 * raw in the child resources.
309 for (i = 0; i < dev->num_addrs; i++)
310 dev->resource[i].start = regs[i];
312 for (i = 0; i < dev->num_addrs; i++) {
314 if (rnum >= dev->parent->num_addrs) {
315 prom_printf("UGH: property for %s was %d, need < %d\n",
316 dp->name, len, dev->parent->num_addrs);
319 dev->resource[i].start = dev->parent->resource[i].start;
320 dev->resource[i].end = dev->parent->resource[i].end;
321 dev->resource[i].flags = IORESOURCE_MEM;
322 dev->resource[i].name = dp->name;
326 op = of_find_device_by_node(dp);
330 dev->num_irqs = op->num_irqs;
331 for (i = 0; i < dev->num_irqs; i++)
332 dev->irqs[i] = op->irqs[i];
335 if (!dev->num_irqs) {
337 * Oh, well, some PROMs don't export interrupts
338 * property to children of EBus devices...
340 * Be smart about PS/2 keyboard and mouse.
342 if (!strcmp(dev->parent->prom_node->name, "8042")) {
343 if (!strcmp(dev->prom_node->name, "kb_ps2")) {
345 dev->irqs[0] = dev->parent->irqs[0];
348 dev->irqs[0] = dev->parent->irqs[1];
354 static int __init child_regs_nonstandard(struct linux_ebus_device *dev)
356 if (!strcmp(dev->prom_node->name, "i2c") ||
357 !strcmp(dev->prom_node->name, "SUNW,lombus"))
362 static void __init fill_ebus_device(struct device_node *dp, struct linux_ebus_device *dev)
364 struct linux_ebus_child *child;
365 struct of_device *op;
370 printk(" [%s", dp->name);
372 op = of_find_device_by_node(dp);
377 (void) of_get_property(dp, "reg", &len);
378 dev->num_addrs = len / sizeof(struct linux_prom_registers);
380 for (i = 0; i < dev->num_addrs; i++)
381 memcpy(&dev->resource[i],
383 sizeof(struct resource));
385 dev->num_irqs = op->num_irqs;
386 for (i = 0; i < dev->num_irqs; i++)
387 dev->irqs[i] = op->irqs[i];
390 dev->ofdev.node = dp;
391 dev->ofdev.dev.parent = &dev->bus->ofdev.dev;
392 dev->ofdev.dev.bus = &ebus_bus_type;
393 strcpy(dev->ofdev.dev.bus_id, dp->path_component_name);
395 /* Register with core */
396 if (of_device_register(&dev->ofdev) != 0)
397 printk(KERN_DEBUG "ebus: device registration error for %s!\n",
398 dev->ofdev.dev.bus_id);
403 dev->children = ebus_alloc(sizeof(struct linux_ebus_child));
405 child = dev->children;
408 child->bus = dev->bus;
409 fill_ebus_child(dp, child,
410 child_regs_nonstandard(dev));
412 while ((dp = dp->sibling) != NULL) {
413 child->next = ebus_alloc(sizeof(struct linux_ebus_child));
418 child->bus = dev->bus;
419 fill_ebus_child(dp, child,
420 child_regs_nonstandard(dev));
426 static struct pci_dev *find_next_ebus(struct pci_dev *start, int *is_rio_p)
428 struct pci_dev *pdev = start;
430 while ((pdev = pci_get_device(PCI_VENDOR_ID_SUN, PCI_ANY_ID, pdev)))
431 if (pdev->device == PCI_DEVICE_ID_SUN_EBUS ||
432 pdev->device == PCI_DEVICE_ID_SUN_RIO_EBUS)
435 *is_rio_p = !!(pdev && (pdev->device == PCI_DEVICE_ID_SUN_RIO_EBUS));
440 void __init ebus_init(void)
442 struct pci_pbm_info *pbm;
443 struct linux_ebus_device *dev;
444 struct linux_ebus *ebus;
445 struct pci_dev *pdev;
446 struct pcidev_cookie *cookie;
447 struct device_node *dp;
451 pdev = find_next_ebus(NULL, &is_rio);
453 printk("ebus: No EBus's found.\n");
457 cookie = pdev->sysdata;
458 dp = cookie->prom_node;
460 ebus_chain = ebus = ebus_alloc(sizeof(struct linux_ebus));
462 ebus->is_rio = is_rio;
465 struct device_node *child;
467 /* SUNW,pci-qfe uses four empty ebuses on it.
468 I think we should not consider them here,
469 as they have half of the properties this
470 code expects and once we do PCI hot-plug,
471 we'd have to tweak with the ebus_chain
472 in the runtime after initialization. -jj */
474 pdev = find_next_ebus(pdev, &is_rio);
476 if (ebus == ebus_chain) {
478 printk("ebus: No EBus's found.\n");
483 ebus->is_rio = is_rio;
484 cookie = pdev->sysdata;
485 dp = cookie->prom_node;
488 printk("ebus%d:", num_ebus);
490 ebus->index = num_ebus;
491 ebus->prom_node = dp;
493 ebus->parent = pbm = cookie->pbm;
495 ebus->ofdev.node = dp;
496 ebus->ofdev.dev.parent = &pdev->dev;
497 ebus->ofdev.dev.bus = &ebus_bus_type;
498 strcpy(ebus->ofdev.dev.bus_id, dp->path_component_name);
500 /* Register with core */
501 if (of_device_register(&ebus->ofdev) != 0)
502 printk(KERN_DEBUG "ebus: device registration error for %s!\n",
503 ebus->ofdev.dev.bus_id);
510 ebus->devices = ebus_alloc(sizeof(struct linux_ebus_device));
514 dev->children = NULL;
516 fill_ebus_device(child, dev);
518 while ((child = child->sibling) != NULL) {
519 dev->next = ebus_alloc(sizeof(struct linux_ebus_device));
523 dev->children = NULL;
525 fill_ebus_device(child, dev);
531 pdev = find_next_ebus(pdev, &is_rio);
535 cookie = pdev->sysdata;
536 dp = cookie->prom_node;
538 ebus->next = ebus_alloc(sizeof(struct linux_ebus));
541 ebus->is_rio = is_rio;
544 pci_dev_put(pdev); /* XXX for the case, when ebusnd is 0, is it OK? */