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Linux/arch/ia64/sn/kernel/io_init.c

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  1 /*
  2  * This file is subject to the terms and conditions of the GNU General Public
  3  * License.  See the file "COPYING" in the main directory of this archive
  4  * for more details.
  5  *
  6  * Copyright (C) 1992 - 1997, 2000-2006 Silicon Graphics, Inc. All rights reserved.
  7  */
  8 
  9 #include <linux/slab.h>
 10 #include <linux/export.h>
 11 #include <asm/sn/types.h>
 12 #include <asm/sn/addrs.h>
 13 #include <asm/sn/io.h>
 14 #include <asm/sn/module.h>
 15 #include <asm/sn/intr.h>
 16 #include <asm/sn/pcibus_provider_defs.h>
 17 #include <asm/sn/pcidev.h>
 18 #include <asm/sn/sn_sal.h>
 19 #include "xtalk/hubdev.h"
 20 
 21 /*
 22  * The code in this file will only be executed when running with
 23  * a PROM that does _not_ have base ACPI IO support.
 24  * (i.e., SN_ACPI_BASE_SUPPORT() == 0)
 25  */
 26 
 27 static int max_segment_number;           /* Default highest segment number */
 28 static int max_pcibus_number = 255;     /* Default highest pci bus number */
 29 
 30 
 31 /*
 32  * Retrieve the hub device info structure for the given nasid.
 33  */
 34 static inline u64 sal_get_hubdev_info(u64 handle, u64 address)
 35 {
 36         struct ia64_sal_retval ret_stuff;
 37         ret_stuff.status = 0;
 38         ret_stuff.v0 = 0;
 39 
 40         SAL_CALL_NOLOCK(ret_stuff,
 41                         (u64) SN_SAL_IOIF_GET_HUBDEV_INFO,
 42                         (u64) handle, (u64) address, 0, 0, 0, 0, 0);
 43         return ret_stuff.v0;
 44 }
 45 
 46 /*
 47  * Retrieve the pci bus information given the bus number.
 48  */
 49 static inline u64 sal_get_pcibus_info(u64 segment, u64 busnum, u64 address)
 50 {
 51         struct ia64_sal_retval ret_stuff;
 52         ret_stuff.status = 0;
 53         ret_stuff.v0 = 0;
 54 
 55         SAL_CALL_NOLOCK(ret_stuff,
 56                         (u64) SN_SAL_IOIF_GET_PCIBUS_INFO,
 57                         (u64) segment, (u64) busnum, (u64) address, 0, 0, 0, 0);
 58         return ret_stuff.v0;
 59 }
 60 
 61 /*
 62  * Retrieve the pci device information given the bus and device|function number.
 63  */
 64 static inline u64
 65 sal_get_pcidev_info(u64 segment, u64 bus_number, u64 devfn, u64 pci_dev,
 66                     u64 sn_irq_info)
 67 {
 68         struct ia64_sal_retval ret_stuff;
 69         ret_stuff.status = 0;
 70         ret_stuff.v0 = 0;
 71 
 72         SAL_CALL_NOLOCK(ret_stuff,
 73                         (u64) SN_SAL_IOIF_GET_PCIDEV_INFO,
 74                         (u64) segment, (u64) bus_number, (u64) devfn,
 75                         (u64) pci_dev,
 76                         sn_irq_info, 0, 0);
 77         return ret_stuff.v0;
 78 }
 79 
 80 
 81 /*
 82  * sn_fixup_ionodes() - This routine initializes the HUB data structure for
 83  *                      each node in the system. This function is only
 84  *                      executed when running with a non-ACPI capable PROM.
 85  */
 86 static void __init sn_fixup_ionodes(void)
 87 {
 88 
 89         struct hubdev_info *hubdev;
 90         u64 status;
 91         u64 nasid;
 92         int i;
 93         extern void sn_common_hubdev_init(struct hubdev_info *);
 94 
 95         /*
 96          * Get SGI Specific HUB chipset information.
 97          * Inform Prom that this kernel can support domain bus numbering.
 98          */
 99         for (i = 0; i < num_cnodes; i++) {
100                 hubdev = (struct hubdev_info *)(NODEPDA(i)->pdinfo);
101                 nasid = cnodeid_to_nasid(i);
102                 hubdev->max_segment_number = 0xffffffff;
103                 hubdev->max_pcibus_number = 0xff;
104                 status = sal_get_hubdev_info(nasid, (u64) __pa(hubdev));
105                 if (status)
106                         continue;
107 
108                 /* Save the largest Domain and pcibus numbers found. */
109                 if (hubdev->max_segment_number) {
110                         /*
111                          * Dealing with a Prom that supports segments.
112                          */
113                         max_segment_number = hubdev->max_segment_number;
114                         max_pcibus_number = hubdev->max_pcibus_number;
115                 }
116                 sn_common_hubdev_init(hubdev);
117         }
118 }
119 
120 /*
121  * sn_pci_legacy_window_fixup - Setup PCI resources for
122  *                              legacy IO and MEM space. This needs to
123  *                              be done here, as the PROM does not have
124  *                              ACPI support defining the root buses
125  *                              and their resources (_CRS),
126  */
127 static void
128 sn_legacy_pci_window_fixup(struct resource *res,
129                 u64 legacy_io, u64 legacy_mem)
130 {
131                 res[0].name = "legacy_io";
132                 res[0].flags = IORESOURCE_IO;
133                 res[0].start = legacy_io;
134                 res[0].end = res[0].start + 0xffff;
135                 res[0].parent = &ioport_resource;
136                 res[1].name = "legacy_mem";
137                 res[1].flags = IORESOURCE_MEM;
138                 res[1].start = legacy_mem;
139                 res[1].end = res[1].start + (1024 * 1024) - 1;
140                 res[1].parent = &iomem_resource;
141 }
142 
143 /*
144  * sn_io_slot_fixup() -   We are not running with an ACPI capable PROM,
145  *                        and need to convert the pci_dev->resource
146  *                        'start' and 'end' addresses to mapped addresses,
147  *                        and setup the pci_controller->window array entries.
148  */
149 void
150 sn_io_slot_fixup(struct pci_dev *dev)
151 {
152         int idx;
153         struct resource *res;
154         unsigned long size;
155         struct pcidev_info *pcidev_info;
156         struct sn_irq_info *sn_irq_info;
157         int status;
158 
159         pcidev_info = kzalloc(sizeof(struct pcidev_info), GFP_KERNEL);
160         if (!pcidev_info)
161                 panic("%s: Unable to alloc memory for pcidev_info", __func__);
162 
163         sn_irq_info = kzalloc(sizeof(struct sn_irq_info), GFP_KERNEL);
164         if (!sn_irq_info)
165                 panic("%s: Unable to alloc memory for sn_irq_info", __func__);
166 
167         /* Call to retrieve pci device information needed by kernel. */
168         status = sal_get_pcidev_info((u64) pci_domain_nr(dev),
169                 (u64) dev->bus->number,
170                 dev->devfn,
171                 (u64) __pa(pcidev_info),
172                 (u64) __pa(sn_irq_info));
173 
174         BUG_ON(status); /* Cannot get platform pci device information */
175 
176 
177         /* Copy over PIO Mapped Addresses */
178         for (idx = 0; idx <= PCI_ROM_RESOURCE; idx++) {
179                 if (!pcidev_info->pdi_pio_mapped_addr[idx])
180                         continue;
181 
182                 res = &dev->resource[idx];
183 
184                 size = res->end - res->start;
185                 if (size == 0)
186                         continue;
187 
188                 res->start = pcidev_info->pdi_pio_mapped_addr[idx];
189                 res->end = res->start + size;
190 
191                 /*
192                  * if it's already in the device structure, remove it before
193                  * inserting
194                  */
195                 if (res->parent && res->parent->child)
196                         release_resource(res);
197 
198                 if (res->flags & IORESOURCE_IO)
199                         insert_resource(&ioport_resource, res);
200                 else
201                         insert_resource(&iomem_resource, res);
202                 /*
203                  * If ROM, mark as shadowed in PROM.
204                  */
205                 if (idx == PCI_ROM_RESOURCE) {
206                         pci_disable_rom(dev);
207                         res->flags = IORESOURCE_MEM | IORESOURCE_ROM_SHADOW |
208                                      IORESOURCE_PCI_FIXED;
209                 }
210         }
211 
212         sn_pci_fixup_slot(dev, pcidev_info, sn_irq_info);
213 }
214 EXPORT_SYMBOL(sn_io_slot_fixup);
215 
216 /*
217  * sn_pci_controller_fixup() - This routine sets up a bus's resources
218  *                             consistent with the Linux PCI abstraction layer.
219  */
220 static void __init
221 sn_pci_controller_fixup(int segment, int busnum, struct pci_bus *bus)
222 {
223         s64 status = 0;
224         struct pci_controller *controller;
225         struct pcibus_bussoft *prom_bussoft_ptr;
226         struct resource *res;
227         LIST_HEAD(resources);
228 
229         status = sal_get_pcibus_info((u64) segment, (u64) busnum,
230                                      (u64) ia64_tpa(&prom_bussoft_ptr));
231         if (status > 0)
232                 return;         /*bus # does not exist */
233         prom_bussoft_ptr = __va(prom_bussoft_ptr);
234 
235         controller = kzalloc(sizeof(*controller), GFP_KERNEL);
236         BUG_ON(!controller);
237         controller->segment = segment;
238 
239         res = kcalloc(2, sizeof(struct resource), GFP_KERNEL);
240         BUG_ON(!res);
241 
242         /*
243          * Temporarily save the prom_bussoft_ptr for use by sn_bus_fixup().
244          * (platform_data will be overwritten later in sn_common_bus_fixup())
245          */
246         controller->platform_data = prom_bussoft_ptr;
247 
248         sn_legacy_pci_window_fixup(res,
249                         prom_bussoft_ptr->bs_legacy_io,
250                         prom_bussoft_ptr->bs_legacy_mem);
251         pci_add_resource_offset(&resources,     &res[0],
252                         prom_bussoft_ptr->bs_legacy_io);
253         pci_add_resource_offset(&resources,     &res[1],
254                         prom_bussoft_ptr->bs_legacy_mem);
255 
256         bus = pci_scan_root_bus(NULL, busnum, &pci_root_ops, controller,
257                                 &resources);
258         if (bus == NULL) {
259                 kfree(res);
260                 kfree(controller);
261                 return;
262         }
263         pci_bus_add_devices(bus);
264 }
265 
266 /*
267  * sn_bus_fixup
268  */
269 void
270 sn_bus_fixup(struct pci_bus *bus)
271 {
272         struct pci_dev *pci_dev = NULL;
273         struct pcibus_bussoft *prom_bussoft_ptr;
274 
275         if (!bus->parent) {  /* If root bus */
276                 prom_bussoft_ptr = PCI_CONTROLLER(bus)->platform_data;
277                 if (prom_bussoft_ptr == NULL) {
278                         printk(KERN_ERR
279                                "sn_bus_fixup: 0x%04x:0x%02x Unable to "
280                                "obtain prom_bussoft_ptr\n",
281                                pci_domain_nr(bus), bus->number);
282                         return;
283                 }
284                 sn_common_bus_fixup(bus, prom_bussoft_ptr);
285         }
286         list_for_each_entry(pci_dev, &bus->devices, bus_list) {
287                 sn_io_slot_fixup(pci_dev);
288         }
289 
290 }
291 
292 /*
293  * sn_io_init - PROM does not have ACPI support to define nodes or root buses,
294  *              so we need to do things the hard way, including initiating the
295  *              bus scanning ourselves.
296  */
297 
298 void __init sn_io_init(void)
299 {
300         int i, j;
301 
302         sn_fixup_ionodes();
303 
304         /* busses are not known yet ... */
305         for (i = 0; i <= max_segment_number; i++)
306                 for (j = 0; j <= max_pcibus_number; j++)
307                         sn_pci_controller_fixup(i, j, NULL);
308 }
309 

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