mm-only debug patch...
[mmotm.git] / arch / sh / drivers / pci / pci.c
blobc481df6390223c7d1a50469ee4c2b1f03c15f780
1 /*
2 * New-style PCI core.
4 * Copyright (c) 2004 - 2009 Paul Mundt
5 * Copyright (c) 2002 M. R. Brown
7 * Modelled after arch/mips/pci/pci.c:
8 * Copyright (C) 2003, 04 Ralf Baechle (ralf@linux-mips.org)
10 * This file is subject to the terms and conditions of the GNU General Public
11 * License. See the file "COPYING" in the main directory of this archive
12 * for more details.
14 #include <linux/kernel.h>
15 #include <linux/mm.h>
16 #include <linux/pci.h>
17 #include <linux/init.h>
18 #include <linux/types.h>
19 #include <linux/dma-debug.h>
20 #include <linux/io.h>
21 #include <linux/mutex.h>
23 unsigned long PCIBIOS_MIN_IO = 0x0000;
24 unsigned long PCIBIOS_MIN_MEM = 0;
27 * The PCI controller list.
29 static struct pci_channel *hose_head, **hose_tail = &hose_head;
31 static int pci_initialized;
33 static void __devinit pcibios_scanbus(struct pci_channel *hose)
35 static int next_busno;
36 struct pci_bus *bus;
38 bus = pci_scan_bus(next_busno, hose->pci_ops, hose);
39 if (bus) {
40 next_busno = bus->subordinate + 1;
41 /* Don't allow 8-bit bus number overflow inside the hose -
42 reserve some space for bridges. */
43 if (next_busno > 224)
44 next_busno = 0;
46 pci_bus_size_bridges(bus);
47 pci_bus_assign_resources(bus);
48 pci_enable_bridges(bus);
52 static DEFINE_MUTEX(pci_scan_mutex);
54 void __devinit register_pci_controller(struct pci_channel *hose)
56 request_resource(&iomem_resource, hose->mem_resource);
57 request_resource(&ioport_resource, hose->io_resource);
59 *hose_tail = hose;
60 hose_tail = &hose->next;
63 * Do not panic here but later - this might hapen before console init.
65 if (!hose->io_map_base) {
66 printk(KERN_WARNING
67 "registering PCI controller with io_map_base unset\n");
71 * Scan the bus if it is register after the PCI subsystem
72 * initialization.
74 if (pci_initialized) {
75 mutex_lock(&pci_scan_mutex);
76 pcibios_scanbus(hose);
77 mutex_unlock(&pci_scan_mutex);
81 static int __init pcibios_init(void)
83 struct pci_channel *hose;
85 /* Scan all of the recorded PCI controllers. */
86 for (hose = hose_head; hose; hose = hose->next)
87 pcibios_scanbus(hose);
89 pci_fixup_irqs(pci_common_swizzle, pcibios_map_platform_irq);
91 dma_debug_add_bus(&pci_bus_type);
93 pci_initialized = 1;
95 return 0;
97 subsys_initcall(pcibios_init);
99 static void pcibios_fixup_device_resources(struct pci_dev *dev,
100 struct pci_bus *bus)
102 /* Update device resources. */
103 struct pci_channel *hose = bus->sysdata;
104 unsigned long offset = 0;
105 int i;
107 for (i = 0; i < PCI_NUM_RESOURCES; i++) {
108 if (!dev->resource[i].start)
109 continue;
110 if (dev->resource[i].flags & IORESOURCE_PCI_FIXED)
111 continue;
112 if (dev->resource[i].flags & IORESOURCE_IO)
113 offset = hose->io_offset;
114 else if (dev->resource[i].flags & IORESOURCE_MEM)
115 offset = hose->mem_offset;
117 dev->resource[i].start += offset;
118 dev->resource[i].end += offset;
123 * Called after each bus is probed, but before its children
124 * are examined.
126 void __devinit pcibios_fixup_bus(struct pci_bus *bus)
128 struct pci_dev *dev = bus->self;
129 struct list_head *ln;
130 struct pci_channel *chan = bus->sysdata;
132 if (!dev) {
133 bus->resource[0] = chan->io_resource;
134 bus->resource[1] = chan->mem_resource;
137 for (ln = bus->devices.next; ln != &bus->devices; ln = ln->next) {
138 dev = pci_dev_b(ln);
140 if ((dev->class >> 8) != PCI_CLASS_BRIDGE_PCI)
141 pcibios_fixup_device_resources(dev, bus);
146 * We need to avoid collisions with `mirrored' VGA ports
147 * and other strange ISA hardware, so we always want the
148 * addresses to be allocated in the 0x000-0x0ff region
149 * modulo 0x400.
151 void pcibios_align_resource(void *data, struct resource *res,
152 resource_size_t size, resource_size_t align)
154 struct pci_dev *dev = data;
155 struct pci_channel *chan = dev->sysdata;
156 resource_size_t start = res->start;
158 if (res->flags & IORESOURCE_IO) {
159 if (start < PCIBIOS_MIN_IO + chan->io_resource->start)
160 start = PCIBIOS_MIN_IO + chan->io_resource->start;
163 * Put everything into 0x00-0xff region modulo 0x400.
165 if (start & 0x300) {
166 start = (start + 0x3ff) & ~0x3ff;
167 res->start = start;
169 } else if (res->flags & IORESOURCE_MEM) {
170 if (start < PCIBIOS_MIN_MEM + chan->mem_resource->start)
171 start = PCIBIOS_MIN_MEM + chan->mem_resource->start;
174 res->start = start;
177 void pcibios_resource_to_bus(struct pci_dev *dev, struct pci_bus_region *region,
178 struct resource *res)
180 struct pci_channel *hose = dev->sysdata;
181 unsigned long offset = 0;
183 if (res->flags & IORESOURCE_IO)
184 offset = hose->io_offset;
185 else if (res->flags & IORESOURCE_MEM)
186 offset = hose->mem_offset;
188 region->start = res->start - offset;
189 region->end = res->end - offset;
192 void __devinit
193 pcibios_bus_to_resource(struct pci_dev *dev, struct resource *res,
194 struct pci_bus_region *region)
196 struct pci_channel *hose = dev->sysdata;
197 unsigned long offset = 0;
199 if (res->flags & IORESOURCE_IO)
200 offset = hose->io_offset;
201 else if (res->flags & IORESOURCE_MEM)
202 offset = hose->mem_offset;
204 res->start = region->start + offset;
205 res->end = region->end + offset;
208 int pcibios_enable_device(struct pci_dev *dev, int mask)
210 u16 cmd, old_cmd;
211 int idx;
212 struct resource *r;
214 pci_read_config_word(dev, PCI_COMMAND, &cmd);
215 old_cmd = cmd;
216 for (idx=0; idx < PCI_NUM_RESOURCES; idx++) {
217 /* Only set up the requested stuff */
218 if (!(mask & (1<<idx)))
219 continue;
221 r = &dev->resource[idx];
222 if (!(r->flags & (IORESOURCE_IO | IORESOURCE_MEM)))
223 continue;
224 if ((idx == PCI_ROM_RESOURCE) &&
225 (!(r->flags & IORESOURCE_ROM_ENABLE)))
226 continue;
227 if (!r->start && r->end) {
228 printk(KERN_ERR "PCI: Device %s not available "
229 "because of resource collisions\n",
230 pci_name(dev));
231 return -EINVAL;
233 if (r->flags & IORESOURCE_IO)
234 cmd |= PCI_COMMAND_IO;
235 if (r->flags & IORESOURCE_MEM)
236 cmd |= PCI_COMMAND_MEMORY;
238 if (cmd != old_cmd) {
239 printk("PCI: Enabling device %s (%04x -> %04x)\n",
240 pci_name(dev), old_cmd, cmd);
241 pci_write_config_word(dev, PCI_COMMAND, cmd);
243 return 0;
247 * If we set up a device for bus mastering, we need to check and set
248 * the latency timer as it may not be properly set.
250 static unsigned int pcibios_max_latency = 255;
252 void pcibios_set_master(struct pci_dev *dev)
254 u8 lat;
255 pci_read_config_byte(dev, PCI_LATENCY_TIMER, &lat);
256 if (lat < 16)
257 lat = (64 <= pcibios_max_latency) ? 64 : pcibios_max_latency;
258 else if (lat > pcibios_max_latency)
259 lat = pcibios_max_latency;
260 else
261 return;
262 printk(KERN_INFO "PCI: Setting latency timer of device %s to %d\n",
263 pci_name(dev), lat);
264 pci_write_config_byte(dev, PCI_LATENCY_TIMER, lat);
267 void __init pcibios_update_irq(struct pci_dev *dev, int irq)
269 pci_write_config_byte(dev, PCI_INTERRUPT_LINE, irq);
272 char * __devinit pcibios_setup(char *str)
274 return str;
277 int pci_mmap_page_range(struct pci_dev *dev, struct vm_area_struct *vma,
278 enum pci_mmap_state mmap_state, int write_combine)
281 * I/O space can be accessed via normal processor loads and stores on
282 * this platform but for now we elect not to do this and portable
283 * drivers should not do this anyway.
285 if (mmap_state == pci_mmap_io)
286 return -EINVAL;
289 * Ignore write-combine; for now only return uncached mappings.
291 vma->vm_page_prot = pgprot_noncached(vma->vm_page_prot);
293 return remap_pfn_range(vma, vma->vm_start, vma->vm_pgoff,
294 vma->vm_end - vma->vm_start,
295 vma->vm_page_prot);
298 #ifndef CONFIG_GENERIC_IOMAP
300 static void __iomem *ioport_map_pci(struct pci_dev *dev,
301 unsigned long port, unsigned int nr)
303 struct pci_channel *chan = dev->sysdata;
305 if (!chan->io_map_base)
306 chan->io_map_base = generic_io_base;
308 return (void __iomem *)(chan->io_map_base + port);
311 void __iomem *pci_iomap(struct pci_dev *dev, int bar, unsigned long maxlen)
313 resource_size_t start = pci_resource_start(dev, bar);
314 resource_size_t len = pci_resource_len(dev, bar);
315 unsigned long flags = pci_resource_flags(dev, bar);
317 if (unlikely(!len || !start))
318 return NULL;
319 if (maxlen && len > maxlen)
320 len = maxlen;
322 if (flags & IORESOURCE_IO)
323 return ioport_map_pci(dev, start, len);
326 * Presently the IORESOURCE_MEM case is a bit special, most
327 * SH7751 style PCI controllers have PCI memory at a fixed
328 * location in the address space where no remapping is desired.
329 * With the IORESOURCE_MEM case more care has to be taken
330 * to inhibit page table mapping for legacy cores, but this is
331 * punted off to __ioremap().
332 * -- PFM.
334 if (flags & IORESOURCE_MEM) {
335 if (flags & IORESOURCE_CACHEABLE)
336 return ioremap(start, len);
338 return ioremap_nocache(start, len);
341 return NULL;
343 EXPORT_SYMBOL(pci_iomap);
345 void pci_iounmap(struct pci_dev *dev, void __iomem *addr)
347 iounmap(addr);
349 EXPORT_SYMBOL(pci_iounmap);
351 #endif /* CONFIG_GENERIC_IOMAP */
353 #ifdef CONFIG_HOTPLUG
354 EXPORT_SYMBOL(pcibios_resource_to_bus);
355 EXPORT_SYMBOL(pcibios_bus_to_resource);
356 EXPORT_SYMBOL(PCIBIOS_MIN_IO);
357 EXPORT_SYMBOL(PCIBIOS_MIN_MEM);
358 #endif