summaryrefslogtreecommitdiffstats
path: root/arch/ia64/sn/kernel/io_init.c
blob: d63809a6adfadbd87e4b3ad0cbf658de05d3bf45 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
/*
 * This file is subject to the terms and conditions of the GNU General Public
 * License.  See the file "COPYING" in the main directory of this archive
 * for more details.
 *
 * Copyright (C) 1992 - 1997, 2000-2006 Silicon Graphics, Inc. All rights reserved.
 */

#include <linux/slab.h>
#include <linux/export.h>
#include <asm/sn/types.h>
#include <asm/sn/addrs.h>
#include <asm/sn/io.h>
#include <asm/sn/module.h>
#include <asm/sn/intr.h>
#include <asm/sn/pcibus_provider_defs.h>
#include <asm/sn/pcidev.h>
#include <asm/sn/sn_sal.h>
#include "xtalk/hubdev.h"

/*
 * The code in this file will only be executed when running with
 * a PROM that does _not_ have base ACPI IO support.
 * (i.e., SN_ACPI_BASE_SUPPORT() == 0)
 */

static int max_segment_number;		 /* Default highest segment number */
static int max_pcibus_number = 255;	/* Default highest pci bus number */


/*
 * Retrieve the hub device info structure for the given nasid.
 */
static inline u64 sal_get_hubdev_info(u64 handle, u64 address)
{
	struct ia64_sal_retval ret_stuff;
	ret_stuff.status = 0;
	ret_stuff.v0 = 0;

	SAL_CALL_NOLOCK(ret_stuff,
			(u64) SN_SAL_IOIF_GET_HUBDEV_INFO,
			(u64) handle, (u64) address, 0, 0, 0, 0, 0);
	return ret_stuff.v0;
}

/*
 * Retrieve the pci bus information given the bus number.
 */
static inline u64 sal_get_pcibus_info(u64 segment, u64 busnum, u64 address)
{
	struct ia64_sal_retval ret_stuff;
	ret_stuff.status = 0;
	ret_stuff.v0 = 0;

	SAL_CALL_NOLOCK(ret_stuff,
			(u64) SN_SAL_IOIF_GET_PCIBUS_INFO,
			(u64) segment, (u64) busnum, (u64) address, 0, 0, 0, 0);
	return ret_stuff.v0;
}

/*
 * Retrieve the pci device information given the bus and device|function number.
 */
static inline u64
sal_get_pcidev_info(u64 segment, u64 bus_number, u64 devfn, u64 pci_dev,
		    u64 sn_irq_info)
{
	struct ia64_sal_retval ret_stuff;
	ret_stuff.status = 0;
	ret_stuff.v0 = 0;

	SAL_CALL_NOLOCK(ret_stuff,
			(u64) SN_SAL_IOIF_GET_PCIDEV_INFO,
			(u64) segment, (u64) bus_number, (u64) devfn,
			(u64) pci_dev,
			sn_irq_info, 0, 0);
	return ret_stuff.v0;
}


/*
 * sn_fixup_ionodes() - This routine initializes the HUB data structure for
 *			each node in the system. This function is only
 *			executed when running with a non-ACPI capable PROM.
 */
static void __init sn_fixup_ionodes(void)
{

	struct hubdev_info *hubdev;
	u64 status;
	u64 nasid;
	int i;
	extern void sn_common_hubdev_init(struct hubdev_info *);

	/*
	 * Get SGI Specific HUB chipset information.
	 * Inform Prom that this kernel can support domain bus numbering.
	 */
	for (i = 0; i < num_cnodes; i++) {
		hubdev = (struct hubdev_info *)(NODEPDA(i)->pdinfo);
		nasid = cnodeid_to_nasid(i);
		hubdev->max_segment_number = 0xffffffff;
		hubdev->max_pcibus_number = 0xff;
		status = sal_get_hubdev_info(nasid, (u64) __pa(hubdev));
		if (status)
			continue;

		/* Save the largest Domain and pcibus numbers found. */
		if (hubdev->max_segment_number) {
			/*
			 * Dealing with a Prom that supports segments.
			 */
			max_segment_number = hubdev->max_segment_number;
			max_pcibus_number = hubdev->max_pcibus_number;
		}
		sn_common_hubdev_init(hubdev);
	}
}

/*
 * sn_pci_legacy_window_fixup - Setup PCI resources for
 *				legacy IO and MEM space. This needs to
 *				be done here, as the PROM does not have
 *				ACPI support defining the root buses
 *				and their resources (_CRS),
 */
static void
sn_legacy_pci_window_fixup(struct resource *res,
		u64 legacy_io, u64 legacy_mem)
{
		res[0].name = "legacy_io";
		res[0].flags = IORESOURCE_IO;
		res[0].start = legacy_io;
		res[0].end = res[0].start + 0xffff;
		res[0].parent = &ioport_resource;
		res[1].name = "legacy_mem";
		res[1].flags = IORESOURCE_MEM;
		res[1].start = legacy_mem;
		res[1].end = res[1].start + (1024 * 1024) - 1;
		res[1].parent = &iomem_resource;
}

/*
 * sn_io_slot_fixup() -   We are not running with an ACPI capable PROM,
 *			  and need to convert the pci_dev->resource
 *			  'start' and 'end' addresses to mapped addresses,
 *			  and setup the pci_controller->window array entries.
 */
void
sn_io_slot_fixup(struct pci_dev *dev)
{
	int idx;
	struct resource *res;
	unsigned long size;
	struct pcidev_info *pcidev_info;
	struct sn_irq_info *sn_irq_info;
	int status;

	pcidev_info = kzalloc(sizeof(struct pcidev_info), GFP_KERNEL);
	if (!pcidev_info)
		panic("%s: Unable to alloc memory for pcidev_info", __func__);

	sn_irq_info = kzalloc(sizeof(struct sn_irq_info), GFP_KERNEL);
	if (!sn_irq_info)
		panic("%s: Unable to alloc memory for sn_irq_info", __func__);

	/* Call to retrieve pci device information needed by kernel. */
	status = sal_get_pcidev_info((u64) pci_domain_nr(dev),
		(u64) dev->bus->number,
		dev->devfn,
		(u64) __pa(pcidev_info),
		(u64) __pa(sn_irq_info));

	BUG_ON(status); /* Cannot get platform pci device information */


	/* Copy over PIO Mapped Addresses */
	for (idx = 0; idx <= PCI_ROM_RESOURCE; idx++) {
		if (!pcidev_info->pdi_pio_mapped_addr[idx])
			continue;

		res = &dev->resource[idx];

		size = res->end - res->start;
		if (size == 0)
			continue;

		res->start = pcidev_info->pdi_pio_mapped_addr[idx];
		res->end = res->start + size;

		/*
		 * if it's already in the device structure, remove it before
		 * inserting
		 */
		if (res->parent && res->parent->child)
			release_resource(res);

		if (res->flags & IORESOURCE_IO)
			insert_resource(&ioport_resource, res);
		else
			insert_resource(&iomem_resource, res);
		/*
		 * If ROM, mark as shadowed in PROM.
		 */
		if (idx == PCI_ROM_RESOURCE) {
			pci_disable_rom(dev);
			res->flags = IORESOURCE_MEM | IORESOURCE_ROM_SHADOW |
				     IORESOURCE_PCI_FIXED;
		}
	}

	sn_pci_fixup_slot(dev, pcidev_info, sn_irq_info);
}
EXPORT_SYMBOL(sn_io_slot_fixup);

/*
 * sn_pci_controller_fixup() - This routine sets up a bus's resources
 *			       consistent with the Linux PCI abstraction layer.
 */
static void __init
sn_pci_controller_fixup(int segment, int busnum, struct pci_bus *bus)
{
	s64 status = 0;
	struct pci_controller *controller;
	struct pcibus_bussoft *prom_bussoft_ptr;
	struct resource *res;
	LIST_HEAD(resources);

 	status = sal_get_pcibus_info((u64) segment, (u64) busnum,
 				     (u64) ia64_tpa(&prom_bussoft_ptr));
 	if (status > 0)
		return;		/*bus # does not exist */
	prom_bussoft_ptr = __va(prom_bussoft_ptr);

	controller = kzalloc(sizeof(*controller), GFP_KERNEL);
	BUG_ON(!controller);
	controller->segment = segment;

	res = kcalloc(2, sizeof(struct resource), GFP_KERNEL);
	BUG_ON(!res);

	/*
	 * Temporarily save the prom_bussoft_ptr for use by sn_bus_fixup().
	 * (platform_data will be overwritten later in sn_common_bus_fixup())
	 */
	controller->platform_data = prom_bussoft_ptr;

	sn_legacy_pci_window_fixup(res,
			prom_bussoft_ptr->bs_legacy_io,
			prom_bussoft_ptr->bs_legacy_mem);
	pci_add_resource_offset(&resources,	&res[0],
			prom_bussoft_ptr->bs_legacy_io);
	pci_add_resource_offset(&resources,	&res[1],
			prom_bussoft_ptr->bs_legacy_mem);

	bus = pci_scan_root_bus(NULL, busnum, &pci_root_ops, controller,
				&resources);
 	if (bus == NULL) {
		kfree(res);
		kfree(controller);
		return;
	}
	pci_bus_add_devices(bus);
}

/*
 * sn_bus_fixup
 */
void
sn_bus_fixup(struct pci_bus *bus)
{
	struct pci_dev *pci_dev = NULL;
	struct pcibus_bussoft *prom_bussoft_ptr;

	if (!bus->parent) {  /* If root bus */
		prom_bussoft_ptr = PCI_CONTROLLER(bus)->platform_data;
		if (prom_bussoft_ptr == NULL) {
			printk(KERN_ERR
			       "sn_bus_fixup: 0x%04x:0x%02x Unable to "
			       "obtain prom_bussoft_ptr\n",
			       pci_domain_nr(bus), bus->number);
			return;
		}
		sn_common_bus_fixup(bus, prom_bussoft_ptr);
        }
        list_for_each_entry(pci_dev, &bus->devices, bus_list) {
                sn_io_slot_fixup(pci_dev);
        }

}

/*
 * sn_io_init - PROM does not have ACPI support to define nodes or root buses,
 *		so we need to do things the hard way, including initiating the
 *		bus scanning ourselves.
 */

void __init sn_io_init(void)
{
	int i, j;

	sn_fixup_ionodes();

	/* busses are not known yet ... */
	for (i = 0; i <= max_segment_number; i++)
		for (j = 0; j <= max_pcibus_number; j++)
			sn_pci_controller_fixup(i, j, NULL);
}
OpenPOWER on IntegriCloud