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/eisa.h>
13 #include <linux/init.h>
14 #include <linux/module.h>
15 #include <linux/kernel.h>
16 #include <linux/pci.h>
17 #include <linux/slab.h>
18 #include <linux/types.h>
21 #include <asm/system.h>
22 #include <asm/cache.h> /* for L1_CACHE_BYTES */
23 #include <asm/superio.h>
25 #define DEBUG_RESOURCES 0
26 #define DEBUG_CONFIG 0
29 # define DBGC(x...) printk(KERN_DEBUG x)
36 #define DBG_RES(x...) printk(KERN_DEBUG x)
41 /* To be used as: mdelay(pci_post_reset_delay);
43 * post_reset is the time the kernel should stall to prevent anyone from
44 * accessing the PCI bus once #RESET is de-asserted.
45 * PCI spec somewhere says 1 second but with multi-PCI bus systems,
46 * this makes the boot time much longer than necessary.
47 * 20ms seems to work for all the HP PCI implementations to date.
49 * #define pci_post_reset_delay 50
52 struct pci_port_ops *pci_port __read_mostly;
53 struct pci_bios_ops *pci_bios __read_mostly;
55 static int pci_hba_count __read_mostly;
57 /* parisc_pci_hba used by pci_port->in/out() ops to lookup bus data. */
58 #define PCI_HBA_MAX 32
59 static struct pci_hba_data *parisc_pci_hba[PCI_HBA_MAX] __read_mostly;
62 /********************************************************************
64 ** I/O port space support
66 *********************************************************************/
68 /* EISA port numbers and PCI port numbers share the same interface. Some
69 * machines have both EISA and PCI adapters installed. Rather than turn
70 * pci_port into an array, we reserve bus 0 for EISA and call the EISA
71 * routines if the access is to a port on bus 0. We don't want to fix
72 * EISA and ISA drivers which assume port space is <= 0xffff.
76 #define EISA_IN(size) if (EISA_bus && (b == 0)) return eisa_in##size(addr)
77 #define EISA_OUT(size) if (EISA_bus && (b == 0)) return eisa_out##size(d, addr)
80 #define EISA_OUT(size)
83 #define PCI_PORT_IN(type, size) \
84 u##size in##type (int addr) \
86 int b = PCI_PORT_HBA(addr); \
88 if (!parisc_pci_hba[b]) return (u##size) -1; \
89 return pci_port->in##type(parisc_pci_hba[b], PCI_PORT_ADDR(addr)); \
91 EXPORT_SYMBOL(in##type);
98 #define PCI_PORT_OUT(type, size) \
99 void out##type (u##size d, int addr) \
101 int b = PCI_PORT_HBA(addr); \
103 if (!parisc_pci_hba[b]) return; \
104 pci_port->out##type(parisc_pci_hba[b], PCI_PORT_ADDR(addr), d); \
106 EXPORT_SYMBOL(out##type);
115 * BIOS32 replacement.
117 static int __init pcibios_init(void)
122 if (pci_bios->init) {
125 printk(KERN_WARNING "pci_bios != NULL but init() is!\n");
131 /* Called from pci_do_scan_bus() *after* walking a bus but before walking PPBs. */
132 void pcibios_fixup_bus(struct pci_bus *bus)
134 if (pci_bios->fixup_bus) {
135 pci_bios->fixup_bus(bus);
137 printk(KERN_WARNING "pci_bios != NULL but fixup_bus() is!\n");
142 char *pcibios_setup(char *str)
148 * Called by pci_set_master() - a driver interface.
150 * Legacy PDC guarantees to set:
151 * Map Memory BAR's into PA IO space.
152 * Map Expansion ROM BAR into one common PA IO space per bus.
153 * Map IO BAR's into PCI IO space.
154 * Command (see below)
158 * PPB: secondary latency timer, io/mmio base/limit,
159 * bus numbers, bridge control
162 void pcibios_set_master(struct pci_dev *dev)
166 /* If someone already mucked with this, don't touch it. */
167 pci_read_config_byte(dev, PCI_LATENCY_TIMER, &lat);
168 if (lat >= 16) return;
171 ** HP generally has fewer devices on the bus than other architectures.
172 ** upper byte is PCI_LATENCY_TIMER.
174 pci_write_config_word(dev, PCI_CACHE_LINE_SIZE,
175 (0x80 << 8) | (L1_CACHE_BYTES / sizeof(u32)));
179 void __init pcibios_init_bus(struct pci_bus *bus)
181 struct pci_dev *dev = bus->self;
182 unsigned short bridge_ctl;
184 /* We deal only with pci controllers and pci-pci bridges. */
185 if (!dev || (dev->class >> 8) != PCI_CLASS_BRIDGE_PCI)
188 /* PCI-PCI bridge - set the cache line and default latency
189 (32) for primary and secondary buses. */
190 pci_write_config_byte(dev, PCI_SEC_LATENCY_TIMER, 32);
192 pci_read_config_word(dev, PCI_BRIDGE_CONTROL, &bridge_ctl);
193 bridge_ctl |= PCI_BRIDGE_CTL_PARITY | PCI_BRIDGE_CTL_SERR;
194 pci_write_config_word(dev, PCI_BRIDGE_CONTROL, bridge_ctl);
197 /* called by drivers/pci/setup-bus.c:pci_setup_bridge(). */
198 void __devinit pcibios_resource_to_bus(struct pci_dev *dev,
199 struct pci_bus_region *region, struct resource *res)
202 struct pci_hba_data *hba = HBA_DATA(dev->bus->bridge->platform_data);
205 if (res->flags & IORESOURCE_IO) {
207 ** I/O space may see busnumbers here. Something
208 ** in the form of 0xbbxxxx where bb is the bus num
209 ** and xxxx is the I/O port space address.
210 ** Remaining address translation are done in the
211 ** PCI Host adapter specific code - ie dino_out8.
213 region->start = PCI_PORT_ADDR(res->start);
214 region->end = PCI_PORT_ADDR(res->end);
215 } else if (res->flags & IORESOURCE_MEM) {
216 /* Convert MMIO addr to PCI addr (undo global virtualization) */
217 region->start = PCI_BUS_ADDR(hba, res->start);
218 region->end = PCI_BUS_ADDR(hba, res->end);
221 DBG_RES("pcibios_resource_to_bus(%02x %s [%lx,%lx])\n",
222 dev->bus->number, res->flags & IORESOURCE_IO ? "IO" : "MEM",
223 region->start, region->end);
226 void pcibios_bus_to_resource(struct pci_dev *dev, struct resource *res,
227 struct pci_bus_region *region)
230 struct pci_hba_data *hba = HBA_DATA(dev->bus->bridge->platform_data);
233 if (res->flags & IORESOURCE_MEM) {
234 res->start = PCI_HOST_ADDR(hba, region->start);
235 res->end = PCI_HOST_ADDR(hba, region->end);
238 if (res->flags & IORESOURCE_IO) {
239 res->start = region->start;
240 res->end = region->end;
244 #ifdef CONFIG_HOTPLUG
245 EXPORT_SYMBOL(pcibios_resource_to_bus);
246 EXPORT_SYMBOL(pcibios_bus_to_resource);
250 * pcibios align resources() is called every time generic PCI code
251 * wants to generate a new address. The process of looking for
252 * an available address, each candidate is first "aligned" and
253 * then checked if the resource is available until a match is found.
255 * Since we are just checking candidates, don't use any fields other
258 void pcibios_align_resource(void *data, struct resource *res,
259 resource_size_t size, resource_size_t alignment)
261 resource_size_t mask, align;
263 DBG_RES("pcibios_align_resource(%s, (%p) [%lx,%lx]/%x, 0x%lx, 0x%lx)\n",
264 pci_name(((struct pci_dev *) data)),
265 res->parent, res->start, res->end,
266 (int) res->flags, size, alignment);
268 /* If it's not IO, then it's gotta be MEM */
269 align = (res->flags & IORESOURCE_IO) ? PCIBIOS_MIN_IO : PCIBIOS_MIN_MEM;
271 /* Align to largest of MIN or input size */
272 mask = max(alignment, align) - 1;
276 /* The caller updates the end field, we don't. */
281 * A driver is enabling the device. We make sure that all the appropriate
282 * bits are set to allow the device to operate as the driver is expecting.
283 * We enable the port IO and memory IO bits if the device has any BARs of
284 * that type, and we enable the PERR and SERR bits unconditionally.
285 * Drivers that do not need parity (eg graphics and possibly networking)
286 * can clear these bits if they want.
288 int pcibios_enable_device(struct pci_dev *dev, int mask)
293 err = pci_enable_resources(dev, mask);
297 pci_read_config_word(dev, PCI_COMMAND, &cmd);
300 cmd |= (PCI_COMMAND_SERR | PCI_COMMAND_PARITY);
303 /* If bridge/bus controller has FBB enabled, child must too. */
304 if (dev->bus->bridge_ctl & PCI_BRIDGE_CTL_FAST_BACK)
305 cmd |= PCI_COMMAND_FAST_BACK;
308 if (cmd != old_cmd) {
309 dev_info(&dev->dev, "enabling SERR and PARITY (%04x -> %04x)\n",
311 pci_write_config_word(dev, PCI_COMMAND, cmd);
317 /* PA-RISC specific */
318 void pcibios_register_hba(struct pci_hba_data *hba)
320 if (pci_hba_count >= PCI_HBA_MAX) {
321 printk(KERN_ERR "PCI: Too many Host Bus Adapters\n");
325 parisc_pci_hba[pci_hba_count] = hba;
326 hba->hba_num = pci_hba_count++;
329 subsys_initcall(pcibios_init);