1 /* pci-vdk.c: MB93090-MB00 (VDK) PCI support
3 * Copyright (C) 2003, 2004 Red Hat, Inc. All Rights Reserved.
4 * Written by David Howells (dhowells@redhat.com)
6 * This program is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU General Public License
8 * as published by the Free Software Foundation; either version
9 * 2 of the License, or (at your option) any later version.
12 #include <linux/types.h>
13 #include <linux/kernel.h>
14 #include <linux/sched.h>
15 #include <linux/pci.h>
16 #include <linux/init.h>
17 #include <linux/ioport.h>
18 #include <linux/delay.h>
19 #include <linux/slab.h>
21 #include <asm/segment.h>
23 #include <asm/mb-regs.h>
24 #include <asm/mb86943a.h>
27 unsigned int __nongpreldata pci_probe = 1;
29 int __nongpreldata pcibios_last_bus = -1;
30 struct pci_bus *__nongpreldata pci_root_bus;
31 struct pci_ops *__nongpreldata pci_root_ops;
34 * The accessible PCI window does not cover the entire CPU address space, but
35 * there are devices we want to access outside of that window, so we need to
36 * insert specific PCI bus resources instead of using the platform-level bus
37 * resources directly for the PCI root bus.
39 * These are configured and inserted by pcibios_init() and are attached to the
40 * root bus by pcibios_fixup_bus().
42 static struct resource pci_ioport_resource = {
45 .end = IO_SPACE_LIMIT,
46 .flags = IORESOURCE_IO,
49 static struct resource pci_iomem_resource = {
53 .flags = IORESOURCE_MEM,
57 * Functions for accessing PCI configuration space
60 #define CONFIG_CMD(bus, dev, where) \
61 (0x80000000 | (bus->number << 16) | (devfn << 8) | (where & ~3))
63 #define __set_PciCfgAddr(A) writel((A), (volatile void __iomem *) __region_CS1 + 0x80)
65 #define __get_PciCfgDataB(A) readb((volatile void __iomem *) __region_CS1 + 0x88 + ((A) & 3))
66 #define __get_PciCfgDataW(A) readw((volatile void __iomem *) __region_CS1 + 0x88 + ((A) & 2))
67 #define __get_PciCfgDataL(A) readl((volatile void __iomem *) __region_CS1 + 0x88)
69 #define __set_PciCfgDataB(A,V) \
70 writeb((V), (volatile void __iomem *) __region_CS1 + 0x88 + (3 - ((A) & 3)))
72 #define __set_PciCfgDataW(A,V) \
73 writew((V), (volatile void __iomem *) __region_CS1 + 0x88 + (2 - ((A) & 2)))
75 #define __set_PciCfgDataL(A,V) \
76 writel((V), (volatile void __iomem *) __region_CS1 + 0x88)
78 #define __get_PciBridgeDataB(A) readb((volatile void __iomem *) __region_CS1 + 0x800 + (A))
79 #define __get_PciBridgeDataW(A) readw((volatile void __iomem *) __region_CS1 + 0x800 + (A))
80 #define __get_PciBridgeDataL(A) readl((volatile void __iomem *) __region_CS1 + 0x800 + (A))
82 #define __set_PciBridgeDataB(A,V) writeb((V), (volatile void __iomem *) __region_CS1 + 0x800 + (A))
83 #define __set_PciBridgeDataW(A,V) writew((V), (volatile void __iomem *) __region_CS1 + 0x800 + (A))
84 #define __set_PciBridgeDataL(A,V) writel((V), (volatile void __iomem *) __region_CS1 + 0x800 + (A))
86 static inline int __query(const struct pci_dev *dev)
88 // return dev->bus->number==0 && (dev->devfn==PCI_DEVFN(0,0));
89 // return dev->bus->number==1;
90 // return dev->bus->number==0 &&
91 // (dev->devfn==PCI_DEVFN(2,0) || dev->devfn==PCI_DEVFN(3,0));
95 /*****************************************************************************/
99 static int pci_frv_read_config(struct pci_bus *bus, unsigned int devfn, int where, int size,
104 if (bus->number == 0 && devfn == PCI_DEVFN(0, 0)) {
105 _value = __get_PciBridgeDataL(where & ~3);
108 __set_PciCfgAddr(CONFIG_CMD(bus, devfn, where));
109 _value = __get_PciCfgDataL(where & ~3);
114 _value = _value >> ((where & 3) * 8);
118 _value = _value >> ((where & 2) * 8);
129 return PCIBIOS_SUCCESSFUL;
132 static int pci_frv_write_config(struct pci_bus *bus, unsigned int devfn, int where, int size,
137 if (bus->number == 0 && devfn == PCI_DEVFN(0, 0)) {
138 __set_PciBridgeDataB(where, value);
141 __set_PciCfgAddr(CONFIG_CMD(bus, devfn, where));
142 __set_PciCfgDataB(where, value);
147 if (bus->number == 0 && devfn == PCI_DEVFN(0, 0)) {
148 __set_PciBridgeDataW(where, value);
151 __set_PciCfgAddr(CONFIG_CMD(bus, devfn, where));
152 __set_PciCfgDataW(where, value);
157 if (bus->number == 0 && devfn == PCI_DEVFN(0, 0)) {
158 __set_PciBridgeDataL(where, value);
161 __set_PciCfgAddr(CONFIG_CMD(bus, devfn, where));
162 __set_PciCfgDataL(where, value);
170 return PCIBIOS_SUCCESSFUL;
173 static struct pci_ops pci_direct_frv = {
175 pci_frv_write_config,
179 * Before we decide to use direct hardware access mechanisms, we try to do some
180 * trivial checks to ensure it at least _seems_ to be working -- we just test
181 * whether bus 00 contains a host bridge (this is similar to checking
182 * techniques used in XFree86, but ours should be more reliable since we
183 * attempt to make use of direct access hints provided by the PCI BIOS).
185 * This should be close to trivial, but it isn't, because there are buggy
186 * chipsets (yes, you guessed it, by Intel and Compaq) that have no class ID.
188 static int __init pci_sanity_check(struct pci_ops *o)
190 struct pci_bus bus; /* Fake bus and device */
195 if (o->read(&bus, 0, PCI_VENDOR_ID, 4, &id) == PCIBIOS_SUCCESSFUL) {
196 printk("PCI: VDK Bridge device:vendor: %08x\n", id);
197 if (id == 0x200e10cf)
201 printk("PCI: VDK Bridge: Sanity check failed\n");
205 static struct pci_ops * __init pci_check_direct(void)
209 local_irq_save(flags);
211 /* check if access works */
212 if (pci_sanity_check(&pci_direct_frv)) {
213 local_irq_restore(flags);
214 printk("PCI: Using configuration frv\n");
215 // request_mem_region(0xBE040000, 256, "FRV bridge");
216 // request_mem_region(0xBFFFFFF4, 12, "PCI frv");
217 return &pci_direct_frv;
220 local_irq_restore(flags);
225 * Discover remaining PCI buses in case there are peer host bridges.
226 * We use the number of last PCI bus provided by the PCI BIOS.
228 static void __init pcibios_fixup_peer_bridges(void)
235 if (pcibios_last_bus <= 0 || pcibios_last_bus >= 0xff)
237 printk("PCI: Peer bridge fixup\n");
238 for (n=0; n <= pcibios_last_bus; n++) {
239 if (pci_find_bus(0, n))
242 bus.ops = pci_root_ops;
244 for(dev.devfn=0; dev.devfn<256; dev.devfn += 8)
245 if (!pci_read_config_word(&dev, PCI_VENDOR_ID, &l) &&
246 l != 0x0000 && l != 0xffff) {
247 printk("Found device at %02x:%02x [%04x]\n", n, dev.devfn, l);
248 printk("PCI: Discovered peer bus %02x\n", n);
249 pci_scan_bus(n, pci_root_ops, NULL);
256 * Exceptions for specific devices. Usually work-arounds for fatal design flaws.
259 static void __init pci_fixup_umc_ide(struct pci_dev *d)
262 * UM8886BF IDE controller sets region type bits incorrectly,
263 * therefore they look like memory despite of them being I/O.
267 printk("PCI: Fixing base address flags for device %s\n", pci_name(d));
269 d->resource[i].flags |= PCI_BASE_ADDRESS_SPACE_IO;
272 static void __init pci_fixup_ide_bases(struct pci_dev *d)
277 * PCI IDE controllers use non-standard I/O port decoding, respect it.
279 if ((d->class >> 8) != PCI_CLASS_STORAGE_IDE)
281 printk("PCI: IDE base address fixup for %s\n", pci_name(d));
283 struct resource *r = &d->resource[i];
284 if ((r->start & ~0x80) == 0x374) {
291 static void __init pci_fixup_ide_trash(struct pci_dev *d)
296 * There exist PCI IDE controllers which have utter garbage
297 * in first four base registers. Ignore that.
299 printk("PCI: IDE base address trash cleared for %s\n", pci_name(d));
301 d->resource[i].start = d->resource[i].end = d->resource[i].flags = 0;
304 static void __devinit pci_fixup_latency(struct pci_dev *d)
307 * SiS 5597 and 5598 chipsets require latency timer set to
308 * at most 32 to avoid lockups.
310 DBG("PCI: Setting max latency to 32\n");
311 pcibios_max_latency = 32;
314 DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_UMC, PCI_DEVICE_ID_UMC_UM8886BF, pci_fixup_umc_ide);
315 DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_SI, PCI_DEVICE_ID_SI_5513, pci_fixup_ide_trash);
316 DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_SI, PCI_DEVICE_ID_SI_5597, pci_fixup_latency);
317 DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_SI, PCI_DEVICE_ID_SI_5598, pci_fixup_latency);
318 DECLARE_PCI_FIXUP_HEADER(PCI_ANY_ID, PCI_ANY_ID, pci_fixup_ide_bases);
321 * Called after each bus is probed, but before its children
325 void __init pcibios_fixup_bus(struct pci_bus *bus)
328 printk("### PCIBIOS_FIXUP_BUS(%d)\n",bus->number);
331 if (bus->number == 0) {
332 bus->resource[0] = &pci_ioport_resource;
333 bus->resource[1] = &pci_iomem_resource;
336 pci_read_bridge_bases(bus);
338 if (bus->number == 0) {
339 struct list_head *ln;
341 for (ln=bus->devices.next; ln != &bus->devices; ln=ln->next) {
343 if (dev->devfn == 0) {
344 dev->resource[0].start = 0;
345 dev->resource[0].end = 0;
352 * Initialization. Try all known PCI access methods. Note that we support
353 * using both PCI BIOS and direct access: in such cases, we use I/O ports
354 * to access config space, but we still keep BIOS order of cards to be
355 * compatible with 2.0.X. This should go away some day.
358 int __init pcibios_init(void)
360 struct pci_ops *dir = NULL;
362 if (!mb93090_mb00_detected)
365 __reg_MB86943_sl_ctl |= MB86943_SL_CTL_DRCT_MASTER_SWAP | MB86943_SL_CTL_DRCT_SLAVE_SWAP;
367 __reg_MB86943_ecs_base(1) = ((__region_CS2 + 0x01000000) >> 9) | 0x08000000;
368 __reg_MB86943_ecs_base(2) = ((__region_CS2 + 0x00000000) >> 9) | 0x08000000;
370 *(volatile uint32_t *) (__region_CS1 + 0x848) = 0xe0000000;
371 *(volatile uint32_t *) (__region_CS1 + 0x8b8) = 0x00000000;
373 __reg_MB86943_sl_pci_io_base = (__region_CS2 + 0x04000000) >> 9;
374 __reg_MB86943_sl_pci_mem_base = (__region_CS2 + 0x08000000) >> 9;
375 __reg_MB86943_pci_sl_io_base = __region_CS2 + 0x04000000;
376 __reg_MB86943_pci_sl_mem_base = __region_CS2 + 0x08000000;
379 /* enable PCI arbitration */
380 __reg_MB86943_pci_arbiter = MB86943_PCIARB_EN;
382 pci_ioport_resource.start = (__reg_MB86943_sl_pci_io_base << 9) & 0xfffffc00;
383 pci_ioport_resource.end = (__reg_MB86943_sl_pci_io_range << 9) | 0x3ff;
384 pci_ioport_resource.end += pci_ioport_resource.start;
386 printk("PCI IO window: %08llx-%08llx\n",
387 (unsigned long long) pci_ioport_resource.start,
388 (unsigned long long) pci_ioport_resource.end);
390 pci_iomem_resource.start = (__reg_MB86943_sl_pci_mem_base << 9) & 0xfffffc00;
391 pci_iomem_resource.end = (__reg_MB86943_sl_pci_mem_range << 9) | 0x3ff;
392 pci_iomem_resource.end += pci_iomem_resource.start;
394 /* Reserve somewhere to write to flush posted writes. This is used by
395 * __flush_PCI_writes() from asm/io.h to force the write FIFO in the
396 * CPU-PCI bridge to flush as this doesn't happen automatically when a
397 * read is performed on the MB93090 development kit motherboard.
399 pci_iomem_resource.start += 0x400;
401 printk("PCI MEM window: %08llx-%08llx\n",
402 (unsigned long long) pci_iomem_resource.start,
403 (unsigned long long) pci_iomem_resource.end);
404 printk("PCI DMA memory: %08lx-%08lx\n",
405 dma_coherent_mem_start, dma_coherent_mem_end);
407 if (insert_resource(&iomem_resource, &pci_iomem_resource) < 0)
408 panic("Unable to insert PCI IOMEM resource\n");
409 if (insert_resource(&ioport_resource, &pci_ioport_resource) < 0)
410 panic("Unable to insert PCI IOPORT resource\n");
415 dir = pci_check_direct();
419 printk("PCI: No PCI bus detected\n");
423 printk("PCI: Probing PCI hardware\n");
424 pci_root_bus = pci_scan_bus(0, pci_root_ops, NULL);
427 pcibios_fixup_peer_bridges();
428 pcibios_fixup_irqs();
429 pcibios_resource_survey();
434 arch_initcall(pcibios_init);
436 char * __init pcibios_setup(char *str)
438 if (!strcmp(str, "off")) {
441 } else if (!strncmp(str, "lastbus=", 8)) {
442 pcibios_last_bus = simple_strtol(str+8, NULL, 0);
448 int pcibios_enable_device(struct pci_dev *dev, int mask)
452 if ((err = pci_enable_resources(dev, mask)) < 0)
454 if (!dev->msi_enabled)
455 pcibios_enable_irq(dev);