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
 27static int max_segment_number;		 /* Default highest segment number */
 28static 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 */
 34static 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 */
 49static 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 */
 64static inline u64
 65sal_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 */
 86static 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 */
127static void
128sn_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 */
149void
150sn_io_slot_fixup(struct pci_dev *dev)
151{
152	int idx;
153	struct resource *res;
154	unsigned long addr, 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 = addr + 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}
214EXPORT_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 */
220static void __init
221sn_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 */
269void
270sn_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
298void __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}