1 /* $Id: pci.c,v 1.6 2000/01/29 00:12:05 grundler Exp $
3 * This file is subject to the terms and conditions of the GNU General Public
4 * License. See the file "COPYING" in the main directory of this archive
7 * Copyright (C) 1997, 1998 Ralf Baechle
8 * Copyright (C) 1999 SuSE GmbH
9 * Copyright (C) 1999-2001 Hewlett-Packard Company
10 * Copyright (C) 1999-2001 Grant Grundler
12 #include <linux/config.h>
13 #include <linux/eisa.h>
14 #include <linux/init.h>
15 #include <linux/module.h>
16 #include <linux/kernel.h>
17 #include <linux/pci.h>
18 #include <linux/slab.h>
19 #include <linux/types.h>
22 #include <asm/system.h>
23 #include <asm/cache.h> /* for L1_CACHE_BYTES */
24 #include <asm/superio.h>
26 #define DEBUG_RESOURCES 0
27 #define DEBUG_CONFIG 0
30 # define DBGC(x...) printk(KERN_DEBUG x)
37 #define DBG_RES(x...) printk(KERN_DEBUG x)
42 /* To be used as: mdelay(pci_post_reset_delay);
44 * post_reset is the time the kernel should stall to prevent anyone from
45 * accessing the PCI bus once #RESET is de-asserted.
46 * PCI spec somewhere says 1 second but with multi-PCI bus systems,
47 * this makes the boot time much longer than necessary.
48 * 20ms seems to work for all the HP PCI implementations to date.
50 * XXX: turn into a #defined constant in <asm/pci.h> ?
52 int pci_post_reset_delay = 50;
54 struct pci_port_ops *pci_port;
55 struct pci_bios_ops *pci_bios;
57 int pci_hba_count = 0;
59 /* parisc_pci_hba used by pci_port->in/out() ops to lookup bus data. */
60 #define PCI_HBA_MAX 32
61 struct pci_hba_data *parisc_pci_hba[PCI_HBA_MAX];
64 /********************************************************************
66 ** I/O port space support
68 *********************************************************************/
70 /* EISA port numbers and PCI port numbers share the same interface. Some
71 * machines have both EISA and PCI adapters installed. Rather than turn
72 * pci_port into an array, we reserve bus 0 for EISA and call the EISA
73 * routines if the access is to a port on bus 0. We don't want to fix
74 * EISA and ISA drivers which assume port space is <= 0xffff.
78 #define EISA_IN(size) if (EISA_bus && (b == 0)) return eisa_in##size(addr)
79 #define EISA_OUT(size) if (EISA_bus && (b == 0)) return eisa_out##size(d, addr)
82 #define EISA_OUT(size)
85 #define PCI_PORT_IN(type, size) \
86 u##size in##type (int addr) \
88 int b = PCI_PORT_HBA(addr); \
90 if (!parisc_pci_hba[b]) return (u##size) -1; \
91 return pci_port->in##type(parisc_pci_hba[b], PCI_PORT_ADDR(addr)); \
93 EXPORT_SYMBOL(in##type);
100 #define PCI_PORT_OUT(type, size) \
101 void out##type (u##size d, int addr) \
103 int b = PCI_PORT_HBA(addr); \
105 if (!parisc_pci_hba[b]) return; \
106 pci_port->out##type(parisc_pci_hba[b], PCI_PORT_ADDR(addr), d); \
108 EXPORT_SYMBOL(out##type);
117 * BIOS32 replacement.
119 static int __init pcibios_init(void)
124 if (pci_bios->init) {
127 printk(KERN_WARNING "pci_bios != NULL but init() is!\n");
133 /* Called from pci_do_scan_bus() *after* walking a bus but before walking PPBs. */
134 void pcibios_fixup_bus(struct pci_bus *bus)
136 if (pci_bios->fixup_bus) {
137 pci_bios->fixup_bus(bus);
139 printk(KERN_WARNING "pci_bios != NULL but fixup_bus() is!\n");
144 char *pcibios_setup(char *str)
150 * Called by pci_set_master() - a driver interface.
152 * Legacy PDC guarantees to set:
153 * Map Memory BAR's into PA IO space.
154 * Map Expansion ROM BAR into one common PA IO space per bus.
155 * Map IO BAR's into PCI IO space.
156 * Command (see below)
160 * PPB: secondary latency timer, io/mmio base/limit,
161 * bus numbers, bridge control
164 void pcibios_set_master(struct pci_dev *dev)
168 /* If someone already mucked with this, don't touch it. */
169 pci_read_config_byte(dev, PCI_LATENCY_TIMER, &lat);
170 if (lat >= 16) return;
173 ** HP generally has fewer devices on the bus than other architectures.
174 ** upper byte is PCI_LATENCY_TIMER.
176 pci_write_config_word(dev, PCI_CACHE_LINE_SIZE,
177 (0x80 << 8) | (L1_CACHE_BYTES / sizeof(u32)));
181 void __init pcibios_init_bus(struct pci_bus *bus)
183 struct pci_dev *dev = bus->self;
184 unsigned short bridge_ctl;
186 /* We deal only with pci controllers and pci-pci bridges. */
187 if (!dev || (dev->class >> 8) != PCI_CLASS_BRIDGE_PCI)
190 /* PCI-PCI bridge - set the cache line and default latency
191 (32) for primary and secondary buses. */
192 pci_write_config_byte(dev, PCI_SEC_LATENCY_TIMER, 32);
194 pci_read_config_word(dev, PCI_BRIDGE_CONTROL, &bridge_ctl);
195 bridge_ctl |= PCI_BRIDGE_CTL_PARITY | PCI_BRIDGE_CTL_SERR;
196 pci_write_config_word(dev, PCI_BRIDGE_CONTROL, bridge_ctl);
200 /* KLUGE: Link the child and parent resources - generic PCI didn't */
202 pcibios_link_hba_resources( struct resource *hba_res, struct resource *r)
205 printk(KERN_EMERG "PCI: Tell willy he's wrong\n");
208 /* reverse link is harder *sigh* */
209 if (r->parent->child) {
210 if (r->parent->sibling) {
211 struct resource *next = r->parent->sibling;
212 while (next->sibling)
213 next = next->sibling;
216 r->parent->sibling = r;
219 r->parent->child = r;
223 /* called by drivers/pci/setup-bus.c:pci_setup_bridge(). */
224 void __devinit pcibios_resource_to_bus(struct pci_dev *dev,
225 struct pci_bus_region *region, struct resource *res)
227 struct pci_bus *bus = dev->bus;
228 struct pci_hba_data *hba = HBA_DATA(bus->bridge->platform_data);
230 if (res->flags & IORESOURCE_IO) {
232 ** I/O space may see busnumbers here. Something
233 ** in the form of 0xbbxxxx where bb is the bus num
234 ** and xxxx is the I/O port space address.
235 ** Remaining address translation are done in the
236 ** PCI Host adapter specific code - ie dino_out8.
238 region->start = PCI_PORT_ADDR(res->start);
239 region->end = PCI_PORT_ADDR(res->end);
240 } else if (res->flags & IORESOURCE_MEM) {
241 /* Convert MMIO addr to PCI addr (undo global virtualization) */
242 region->start = PCI_BUS_ADDR(hba, res->start);
243 region->end = PCI_BUS_ADDR(hba, res->end);
246 DBG_RES("pcibios_resource_to_bus(%02x %s [%lx,%lx])\n",
247 bus->number, res->flags & IORESOURCE_IO ? "IO" : "MEM",
248 region->start, region->end);
251 ** if this resource isn't linked to a "parent", then it seems
252 ** to be a child of the HBA - lets link it in.
254 pcibios_link_hba_resources(&hba->io_space, bus->resource[0]);
255 pcibios_link_hba_resources(&hba->lmmio_space, bus->resource[1]);
258 void pcibios_bus_to_resource(struct pci_dev *dev, struct resource *res,
259 struct pci_bus_region *region)
261 struct pci_bus *bus = dev->bus;
262 struct pci_hba_data *hba = HBA_DATA(bus->bridge->platform_data);
264 if (res->flags & IORESOURCE_MEM) {
265 res->start = PCI_HOST_ADDR(hba, region->start);
266 res->end = PCI_HOST_ADDR(hba, region->end);
269 if (res->flags & IORESOURCE_IO) {
270 res->start = region->start;
271 res->end = region->end;
275 #ifdef CONFIG_HOTPLUG
276 EXPORT_SYMBOL(pcibios_resource_to_bus);
277 EXPORT_SYMBOL(pcibios_bus_to_resource);
281 * pcibios align resources() is called every time generic PCI code
282 * wants to generate a new address. The process of looking for
283 * an available address, each candidate is first "aligned" and
284 * then checked if the resource is available until a match is found.
286 * Since we are just checking candidates, don't use any fields other
289 void pcibios_align_resource(void *data, struct resource *res,
290 unsigned long size, unsigned long alignment)
292 unsigned long mask, align;
294 DBG_RES("pcibios_align_resource(%s, (%p) [%lx,%lx]/%x, 0x%lx, 0x%lx)\n",
295 pci_name(((struct pci_dev *) data)),
296 res->parent, res->start, res->end,
297 (int) res->flags, size, alignment);
299 /* If it's not IO, then it's gotta be MEM */
300 align = (res->flags & IORESOURCE_IO) ? PCIBIOS_MIN_IO : PCIBIOS_MIN_MEM;
302 /* Align to largest of MIN or input size */
303 mask = max(alignment, align) - 1;
307 /* The caller updates the end field, we don't. */
312 * A driver is enabling the device. We make sure that all the appropriate
313 * bits are set to allow the device to operate as the driver is expecting.
314 * We enable the port IO and memory IO bits if the device has any BARs of
315 * that type, and we enable the PERR and SERR bits unconditionally.
316 * Drivers that do not need parity (eg graphics and possibly networking)
317 * can clear these bits if they want.
319 int pcibios_enable_device(struct pci_dev *dev, int mask)
324 pci_read_config_word(dev, PCI_COMMAND, &cmd);
326 for (idx = 0; idx < DEVICE_COUNT_RESOURCE; idx++) {
327 struct resource *r = &dev->resource[idx];
329 /* only setup requested resources */
330 if (!(mask & (1<<idx)))
333 if (r->flags & IORESOURCE_IO)
334 cmd |= PCI_COMMAND_IO;
335 if (r->flags & IORESOURCE_MEM)
336 cmd |= PCI_COMMAND_MEMORY;
339 cmd |= (PCI_COMMAND_SERR | PCI_COMMAND_PARITY);
342 /* If bridge/bus controller has FBB enabled, child must too. */
343 if (dev->bus->bridge_ctl & PCI_BRIDGE_CTL_FAST_BACK)
344 cmd |= PCI_COMMAND_FAST_BACK;
346 DBGC("PCIBIOS: Enabling device %s cmd 0x%04x\n", pci_name(dev), cmd);
347 pci_write_config_word(dev, PCI_COMMAND, cmd);
352 /* PA-RISC specific */
353 void pcibios_register_hba(struct pci_hba_data *hba)
355 if (pci_hba_count >= PCI_HBA_MAX) {
356 printk(KERN_ERR "PCI: Too many Host Bus Adapters\n");
360 parisc_pci_hba[pci_hba_count] = hba;
361 hba->hba_num = pci_hba_count++;
364 subsys_initcall(pcibios_init);