aboutsummaryrefslogtreecommitdiff
path: root/drivers/pci/hotplug/shpchprm_legacy.c
blob: ba6c549c9b9d1e9cac52709bc9b532508ed63d7c (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
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
/*
 * SHPCHPRM Legacy: PHP Resource Manager for Non-ACPI/Legacy platform
 *
 * Copyright (C) 1995,2001 Compaq Computer Corporation
 * Copyright (C) 2001 Greg Kroah-Hartman (greg@kroah.com)
 * Copyright (C) 2001 IBM Corp.
 * Copyright (C) 2003-2004 Intel Corporation
 *
 * All rights reserved.
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or (at
 * your option) any later version.
 *
 * This program is distributed in the hope that it will be useful, but
 * WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or
 * NON INFRINGEMENT.  See the GNU General Public License for more
 * details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
 *
 * Send feedback to <greg@kroah.com>,<kristen.c.accardi@intel.com>
 *
 */

#include <linux/config.h>
#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/types.h>
#include <linux/pci.h>
#include <linux/init.h>
#include <asm/uaccess.h>
#ifdef CONFIG_IA64
#include <asm/iosapic.h>
#endif
#include "shpchp.h"
#include "shpchprm.h"
#include "shpchprm_legacy.h"

static void __iomem *shpchp_rom_start;
static u16 unused_IRQ;

void shpchprm_cleanup(void)
{
	if (shpchp_rom_start)
		iounmap(shpchp_rom_start);
}

int shpchprm_print_pirt(void)
{
	return 0;
}

int shpchprm_get_physical_slot_number(struct controller *ctrl, u32 *sun, u8 busnum, u8 devnum)
{
	int	offset = devnum - ctrl->slot_device_offset;

	*sun = (u8) (ctrl->first_slot + ctrl->slot_num_inc * offset);
	return 0;
}

/* Find the Hot Plug Resource Table in the specified region of memory */
static void __iomem *detect_HRT_floating_pointer(void __iomem *begin, void __iomem *end)
{
	void __iomem *fp;
	void __iomem *endp;
	u8 temp1, temp2, temp3, temp4;
	int status = 0;

	endp = (end - sizeof(struct hrt) + 1);

	for (fp = begin; fp <= endp; fp += 16) {
		temp1 = readb(fp + SIG0);
		temp2 = readb(fp + SIG1);
		temp3 = readb(fp + SIG2);
		temp4 = readb(fp + SIG3);
		if (temp1 == '$' && temp2 == 'H' && temp3 == 'R' && temp4 == 'T') {
			status = 1;
			break;
		}
	}

	if (!status)
		fp = NULL;

	dbg("Discovered Hotplug Resource Table at %p\n", fp);
	return fp;
}

/*
 * shpchprm_find_available_resources
 *
 *  Finds available memory, IO, and IRQ resources for programming
 *  devices which may be added to the system
 *  this function is for hot plug ADD!
 *
 * returns 0 if success
 */
int shpchprm_find_available_resources(struct controller *ctrl)
{
	u8 populated_slot;
	u8 bridged_slot;
	void __iomem *one_slot;
	struct pci_func *func = NULL;
	int i = 10, index = 0;
	u32 temp_dword, rc;
	ulong temp_ulong;
	struct pci_resource *mem_node;
	struct pci_resource *p_mem_node;
	struct pci_resource *io_node;
	struct pci_resource *bus_node;
	void __iomem *rom_resource_table;
	struct pci_bus lpci_bus, *pci_bus;
	u8 cfgspc_irq, temp;

	memcpy(&lpci_bus, ctrl->pci_bus, sizeof(lpci_bus));
	pci_bus = &lpci_bus;
	rom_resource_table = detect_HRT_floating_pointer(shpchp_rom_start, shpchp_rom_start + 0xffff);
	dbg("rom_resource_table = %p\n", rom_resource_table);
	if (rom_resource_table == NULL)
		return -ENODEV;

	/* Sum all resources and setup resource maps */
	unused_IRQ = readl(rom_resource_table + UNUSED_IRQ);
	dbg("unused_IRQ = %x\n", unused_IRQ);

	temp = 0;
	while (unused_IRQ) {
		if (unused_IRQ & 1) {
			shpchp_disk_irq = temp;
			break;
		}
		unused_IRQ = unused_IRQ >> 1;
		temp++;
	}

	dbg("shpchp_disk_irq= %d\n", shpchp_disk_irq);
	unused_IRQ = unused_IRQ >> 1;
	temp++;

	while (unused_IRQ) {
		if (unused_IRQ & 1) {
			shpchp_nic_irq = temp;
			break;
		}
		unused_IRQ = unused_IRQ >> 1;
		temp++;
	}

	dbg("shpchp_nic_irq= %d\n", shpchp_nic_irq);
	unused_IRQ = readl(rom_resource_table + PCIIRQ);

	temp = 0;

	pci_read_config_byte(ctrl->pci_dev, PCI_INTERRUPT_LINE, &cfgspc_irq);

	if (!shpchp_nic_irq) {
		shpchp_nic_irq = cfgspc_irq;
	}

	if (!shpchp_disk_irq) {
		shpchp_disk_irq = cfgspc_irq;
	}

	dbg("shpchp_disk_irq, shpchp_nic_irq= %d, %d\n", shpchp_disk_irq, shpchp_nic_irq);

	one_slot = rom_resource_table + sizeof(struct hrt);

	i = readb(rom_resource_table + NUMBER_OF_ENTRIES);
	dbg("number_of_entries = %d\n", i);

	if (!readb(one_slot + SECONDARY_BUS))
		return (1);

	dbg("dev|IO base|length|MEMbase|length|PM base|length|PB SB MB\n");

	while (i && readb(one_slot + SECONDARY_BUS)) {
		u8 dev_func = readb(one_slot + DEV_FUNC);
		u8 primary_bus = readb(one_slot + PRIMARY_BUS);
		u8 secondary_bus = readb(one_slot + SECONDARY_BUS);
		u8 max_bus = readb(one_slot + MAX_BUS);
		u16 io_base = readw(one_slot + IO_BASE);
		u16 io_length = readw(one_slot + IO_LENGTH);
		u16 mem_base = readw(one_slot + MEM_BASE);
		u16 mem_length = readw(one_slot + MEM_LENGTH);
		u16 pre_mem_base = readw(one_slot + PRE_MEM_BASE);
		u16 pre_mem_length = readw(one_slot + PRE_MEM_LENGTH);

		dbg("%2.2x |  %4.4x | %4.4x |  %4.4x | %4.4x |  %4.4x | %4.4x |%2.2x %2.2x %2.2x\n",
				dev_func, io_base, io_length, mem_base, mem_length, pre_mem_base, pre_mem_length,
				primary_bus, secondary_bus, max_bus);

		/* If this entry isn't for our controller's bus, ignore it */
		if (primary_bus != ctrl->slot_bus) {
			i--;
			one_slot += sizeof(struct slot_rt);
			continue;
		}
		/* find out if this entry is for an occupied slot */
		temp_dword = 0xFFFFFFFF;
		pci_bus->number = primary_bus;
		pci_bus_read_config_dword(pci_bus, dev_func, PCI_VENDOR_ID, &temp_dword);

		dbg("temp_D_word = %x\n", temp_dword);

		if (temp_dword != 0xFFFFFFFF) {
			index = 0;
			func = shpchp_slot_find(primary_bus, dev_func >> 3, 0);

			while (func && (func->function != (dev_func & 0x07))) {
				dbg("func = %p b:d:f(%x:%x:%x)\n", func, primary_bus, dev_func >> 3, index);
				func = shpchp_slot_find(primary_bus, dev_func >> 3, index++);
			}

			/* If we can't find a match, skip this table entry */
			if (!func) {
				i--;
				one_slot += sizeof(struct slot_rt);
				continue;
			}
			/* this may not work and shouldn't be used */
			if (secondary_bus != primary_bus)
				bridged_slot = 1;
			else
				bridged_slot = 0;

			populated_slot = 1;
		} else {
			populated_slot = 0;
			bridged_slot = 0;
		}
		dbg("slot populated =%s \n", populated_slot?"yes":"no");

		/* If we've got a valid IO base, use it */

		temp_ulong = io_base + io_length;

		if ((io_base) && (temp_ulong <= 0x10000)) {
			io_node = (struct pci_resource *) kmalloc(sizeof(struct pci_resource), GFP_KERNEL);
			if (!io_node)
				return -ENOMEM;

			io_node->base = (ulong)io_base;
			io_node->length = (ulong)io_length;
			dbg("found io_node(base, length) = %x, %x\n", io_node->base, io_node->length);

			if (!populated_slot) {
				io_node->next = ctrl->io_head;
				ctrl->io_head = io_node;
			} else {
				io_node->next = func->io_head;
				func->io_head = io_node;
			}
		}

		/* If we've got a valid memory base, use it */
		temp_ulong = mem_base + mem_length;
		if ((mem_base) && (temp_ulong <= 0x10000)) {
			mem_node = (struct pci_resource *) kmalloc(sizeof(struct pci_resource), GFP_KERNEL);
			if (!mem_node)
				return -ENOMEM;

			mem_node->base = (ulong)mem_base << 16;
			mem_node->length = (ulong)(mem_length << 16);
			dbg("found mem_node(base, length) = %x, %x\n", mem_node->base, mem_node->length);

			if (!populated_slot) {
				mem_node->next = ctrl->mem_head;
				ctrl->mem_head = mem_node;
			} else {
				mem_node->next = func->mem_head;
				func->mem_head = mem_node;
			}
		}

		/*
		 * If we've got a valid prefetchable memory base, and
		 * the base + length isn't greater than 0xFFFF
		 */
		temp_ulong = pre_mem_base + pre_mem_length;
		if ((pre_mem_base) && (temp_ulong <= 0x10000)) {
			p_mem_node = (struct pci_resource *) kmalloc(sizeof(struct pci_resource), GFP_KERNEL);
			if (!p_mem_node)
				return -ENOMEM;

			p_mem_node->base = (ulong)pre_mem_base << 16;
			p_mem_node->length = (ulong)pre_mem_length << 16;
			dbg("found p_mem_node(base, length) = %x, %x\n", p_mem_node->base, p_mem_node->length);

			if (!populated_slot) {
				p_mem_node->next = ctrl->p_mem_head;
				ctrl->p_mem_head = p_mem_node;
			} else {
				p_mem_node->next = func->p_mem_head;
				func->p_mem_head = p_mem_node;
			}
		}

		/*
		 * If we've got a valid bus number, use it
		 * The second condition is to ignore bus numbers on
		 * populated slots that don't have PCI-PCI bridges
		 */
		if (secondary_bus && (secondary_bus != primary_bus)) {
			bus_node = (struct pci_resource *) kmalloc(sizeof(struct pci_resource), GFP_KERNEL);
			if (!bus_node)
				return -ENOMEM;

			bus_node->base = (ulong)secondary_bus;
			bus_node->length = (ulong)(max_bus - secondary_bus + 1);
			dbg("found bus_node(base, length) = %x, %x\n", bus_node->base, bus_node->length);

			if (!populated_slot) {
				bus_node->next = ctrl->bus_head;
				ctrl->bus_head = bus_node;
			} else {
				bus_node->next = func->bus_head;
				func->bus_head = bus_node;
			}
		}

		i--;
		one_slot += sizeof(struct slot_rt);
	}

	/* If all of the following fail, we don't have any resources for hot plug add */
	rc = 1;
	rc &= shpchp_resource_sort_and_combine(&(ctrl->mem_head));
	rc &= shpchp_resource_sort_and_combine(&(ctrl->p_mem_head));
	rc &= shpchp_resource_sort_and_combine(&(ctrl->io_head));
	rc &= shpchp_resource_sort_and_combine(&(ctrl->bus_head));

	return (rc);
}

int shpchprm_set_hpp(
	struct controller *ctrl,
	struct pci_func *func,
	u8	card_type)
{
	u32 rc;
	u8 temp_byte;
	struct pci_bus lpci_bus, *pci_bus;
	unsigned int	devfn;
	memcpy(&lpci_bus, ctrl->pci_bus, sizeof(lpci_bus));
	pci_bus = &lpci_bus;
	pci_bus->number = func->bus;
	devfn = PCI_DEVFN(func->device, func->function);

	temp_byte = 0x40;	/* hard coded value for LT */
	if (card_type == PCI_HEADER_TYPE_BRIDGE) {
		/* set subordinate Latency Timer */
		rc = pci_bus_write_config_byte(pci_bus, devfn, PCI_SEC_LATENCY_TIMER, temp_byte);
		if (rc) {
			dbg("%s: set secondary LT error. b:d:f(%02x:%02x:%02x)\n", __FUNCTION__, func->bus, 
				func->device, func->function);
			return rc;
		}
	}

	/* set base Latency Timer */
	rc = pci_bus_write_config_byte(pci_bus, devfn, PCI_LATENCY_TIMER, temp_byte);
	if (rc) {
		dbg("%s: set LT error. b:d:f(%02x:%02x:%02x)\n", __FUNCTION__, func->bus, func->device, func->function);
		return rc;
	}

	/* set Cache Line size */
	temp_byte = 0x08;	/* hard coded value for CLS */
	rc = pci_bus_write_config_byte(pci_bus, devfn, PCI_CACHE_LINE_SIZE, temp_byte);
	if (rc) {
		dbg("%s: set CLS error. b:d:f(%02x:%02x:%02x)\n", __FUNCTION__, func->bus, func->device, func->function);
	}

	/* set enable_perr */
	/* set enable_serr */

	return rc;
}

void shpchprm_enable_card(
	struct controller *ctrl,
	struct pci_func *func,
	u8 card_type)
{
	u16 command, bcommand;
	struct pci_bus lpci_bus, *pci_bus;
	unsigned int devfn;
	int rc;

	memcpy(&lpci_bus, ctrl->pci_bus, sizeof(lpci_bus));
	pci_bus = &lpci_bus;
	pci_bus->number = func->bus;
	devfn = PCI_DEVFN(func->device, func->function);

	rc = pci_bus_read_config_word(pci_bus, devfn, PCI_COMMAND, &command);
	command |= PCI_COMMAND_PARITY | PCI_COMMAND_SERR
		| PCI_COMMAND_MASTER | PCI_COMMAND_INVALIDATE
		| PCI_COMMAND_IO | PCI_COMMAND_MEMORY;
	rc = pci_bus_write_config_word(pci_bus, devfn, PCI_COMMAND, command);

	if (card_type == PCI_HEADER_TYPE_BRIDGE) {
		rc = pci_bus_read_config_word(pci_bus, devfn, PCI_BRIDGE_CONTROL, &bcommand);
		bcommand |= PCI_BRIDGE_CTL_PARITY | PCI_BRIDGE_CTL_SERR
			| PCI_BRIDGE_CTL_NO_ISA;
		rc = pci_bus_write_config_word(pci_bus, devfn, PCI_BRIDGE_CONTROL, bcommand);
	}
}

static int legacy_shpchprm_init_pci(void)
{
	shpchp_rom_start = ioremap(ROM_PHY_ADDR, ROM_PHY_LEN);
	if (!shpchp_rom_start) {
		err("Could not ioremap memory region for ROM\n");
		return -EIO;
	}

	return 0;
}

int shpchprm_init(enum php_ctlr_type ctrl_type)
{
	int retval;

	switch (ctrl_type) {
	case PCI:
		retval = legacy_shpchprm_init_pci();
		break;
	default:
		retval = -ENODEV;
		break;
	}

	return retval;
}