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Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
2 * pci-vr41xx.c, PCI Control Unit routines for the NEC VR4100 series.
3 *
4 * Copyright (C) 2001-2003 MontaVista Software Inc.
5 * Author: Yoichi Yuasa <yyuasa@mvista.com or source@mvista.com>
Ralf Baechle29ce2c72005-12-12 20:11:50 +00006 * Copyright (C) 2004-2005 Yoichi Yuasa <yoichi_yuasa@tripeaks.co.jp>
Yoichi Yuasa5dfa9c12005-04-16 15:24:40 -07007 * Copyright (C) 2004 by Ralf Baechle (ralf@linux-mips.org)
Linus Torvalds1da177e2005-04-16 15:20:36 -07008 *
9 * This program is free software; you can redistribute it and/or modify
10 * it under the terms of the GNU General Public License as published by
11 * the Free Software Foundation; either version 2 of the License, or
12 * (at your option) any later version.
13 *
14 * This program is distributed in the hope that it will be useful,
15 * but WITHOUT ANY WARRANTY; without even the implied warranty of
16 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
17 * GNU General Public License for more details.
18 *
19 * You should have received a copy of the GNU General Public License
20 * along with this program; if not, write to the Free Software
21 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
22 */
23/*
24 * Changes:
25 * MontaVista Software Inc. <yyuasa@mvista.com> or <source@mvista.com>
26 * - New creation, NEC VR4122 and VR4131 are supported.
27 */
28#include <linux/init.h>
29#include <linux/pci.h>
30#include <linux/types.h>
31
32#include <asm/cpu.h>
33#include <asm/io.h>
Yoichi Yuasa5dfa9c12005-04-16 15:24:40 -070034#include <asm/vr41xx/pci.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070035#include <asm/vr41xx/vr41xx.h>
36
37#include "pci-vr41xx.h"
38
39extern struct pci_ops vr41xx_pci_ops;
40
Yoichi Yuasa5dfa9c12005-04-16 15:24:40 -070041static void __iomem *pciu_base;
42
43#define pciu_read(offset) readl(pciu_base + (offset))
44#define pciu_write(offset, value) writel((value), pciu_base + (offset))
45
Linus Torvalds1da177e2005-04-16 15:20:36 -070046static struct pci_master_address_conversion pci_master_memory1 = {
47 .bus_base_address = PCI_MASTER_MEM1_BUS_BASE_ADDRESS,
48 .address_mask = PCI_MASTER_MEM1_ADDRESS_MASK,
49 .pci_base_address = PCI_MASTER_MEM1_PCI_BASE_ADDRESS,
50};
51
52static struct pci_target_address_conversion pci_target_memory1 = {
53 .address_mask = PCI_TARGET_MEM1_ADDRESS_MASK,
54 .bus_base_address = PCI_TARGET_MEM1_BUS_BASE_ADDRESS,
55};
56
57static struct pci_master_address_conversion pci_master_io = {
58 .bus_base_address = PCI_MASTER_IO_BUS_BASE_ADDRESS,
59 .address_mask = PCI_MASTER_IO_ADDRESS_MASK,
60 .pci_base_address = PCI_MASTER_IO_PCI_BASE_ADDRESS,
61};
62
63static struct pci_mailbox_address pci_mailbox = {
64 .base_address = PCI_MAILBOX_BASE_ADDRESS,
65};
66
67static struct pci_target_address_window pci_target_window1 = {
68 .base_address = PCI_TARGET_WINDOW1_BASE_ADDRESS,
69};
70
71static struct resource pci_mem_resource = {
72 .name = "PCI Memory resources",
73 .start = PCI_MEM_RESOURCE_START,
74 .end = PCI_MEM_RESOURCE_END,
75 .flags = IORESOURCE_MEM,
76};
77
78static struct resource pci_io_resource = {
79 .name = "PCI I/O resources",
80 .start = PCI_IO_RESOURCE_START,
81 .end = PCI_IO_RESOURCE_END,
82 .flags = IORESOURCE_IO,
83};
84
85static struct pci_controller_unit_setup vr41xx_pci_controller_unit_setup = {
86 .master_memory1 = &pci_master_memory1,
87 .target_memory1 = &pci_target_memory1,
88 .master_io = &pci_master_io,
89 .exclusive_access = CANNOT_LOCK_FROM_DEVICE,
90 .wait_time_limit_from_irdy_to_trdy = 0,
91 .mailbox = &pci_mailbox,
92 .target_window1 = &pci_target_window1,
93 .master_latency_timer = 0x80,
94 .retry_limit = 0,
95 .arbiter_priority_control = PCI_ARBITRATION_MODE_FAIR,
96 .take_away_gnt_mode = PCI_TAKE_AWAY_GNT_DISABLE,
97};
98
99static struct pci_controller vr41xx_pci_controller = {
100 .pci_ops = &vr41xx_pci_ops,
101 .mem_resource = &pci_mem_resource,
102 .io_resource = &pci_io_resource,
103};
104
105void __init vr41xx_pciu_setup(struct pci_controller_unit_setup *setup)
106{
107 vr41xx_pci_controller_unit_setup = *setup;
108}
109
110static int __init vr41xx_pciu_init(void)
111{
112 struct pci_controller_unit_setup *setup;
113 struct pci_master_address_conversion *master;
114 struct pci_target_address_conversion *target;
115 struct pci_mailbox_address *mailbox;
116 struct pci_target_address_window *window;
117 unsigned long vtclock, pci_clock_max;
118 uint32_t val;
119
120 setup = &vr41xx_pci_controller_unit_setup;
121
Yoichi Yuasa5dfa9c12005-04-16 15:24:40 -0700122 if (request_mem_region(PCIU_BASE, PCIU_SIZE, "PCIU") == NULL)
123 return -EBUSY;
124
125 pciu_base = ioremap(PCIU_BASE, PCIU_SIZE);
126 if (pciu_base == NULL) {
127 release_mem_region(PCIU_BASE, PCIU_SIZE);
128 return -EBUSY;
129 }
130
Linus Torvalds1da177e2005-04-16 15:20:36 -0700131 /* Disable PCI interrupt */
132 vr41xx_disable_pciint();
133
134 /* Supply VTClock to PCIU */
135 vr41xx_supply_clock(PCIU_CLOCK);
136
137 /* Dummy write, waiting for supply of VTClock. */
138 vr41xx_disable_pciint();
139
140 /* Select PCI clock */
141 if (setup->pci_clock_max != 0)
142 pci_clock_max = setup->pci_clock_max;
143 else
144 pci_clock_max = PCI_CLOCK_MAX;
145 vtclock = vr41xx_get_vtclock_frequency();
146 if (vtclock < pci_clock_max)
Yoichi Yuasa5dfa9c12005-04-16 15:24:40 -0700147 pciu_write(PCICLKSELREG, EQUAL_VTCLOCK);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700148 else if ((vtclock / 2) < pci_clock_max)
Yoichi Yuasa5dfa9c12005-04-16 15:24:40 -0700149 pciu_write(PCICLKSELREG, HALF_VTCLOCK);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700150 else if (current_cpu_data.processor_id >= PRID_VR4131_REV2_1 &&
151 (vtclock / 3) < pci_clock_max)
Yoichi Yuasa5dfa9c12005-04-16 15:24:40 -0700152 pciu_write(PCICLKSELREG, ONE_THIRD_VTCLOCK);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700153 else if ((vtclock / 4) < pci_clock_max)
Yoichi Yuasa5dfa9c12005-04-16 15:24:40 -0700154 pciu_write(PCICLKSELREG, QUARTER_VTCLOCK);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700155 else {
156 printk(KERN_ERR "PCI Clock is over 33MHz.\n");
Roel Kluinbb856c52007-11-04 13:00:06 +0100157 iounmap(pciu_base);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700158 return -EINVAL;
159 }
160
161 /* Supply PCI clock by PCI bus */
162 vr41xx_supply_clock(PCI_CLOCK);
163
164 if (setup->master_memory1 != NULL) {
165 master = setup->master_memory1;
166 val = IBA(master->bus_base_address) |
167 MASTER_MSK(master->address_mask) |
168 WINEN |
169 PCIA(master->pci_base_address);
Yoichi Yuasa5dfa9c12005-04-16 15:24:40 -0700170 pciu_write(PCIMMAW1REG, val);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700171 } else {
Yoichi Yuasa5dfa9c12005-04-16 15:24:40 -0700172 val = pciu_read(PCIMMAW1REG);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700173 val &= ~WINEN;
Yoichi Yuasa5dfa9c12005-04-16 15:24:40 -0700174 pciu_write(PCIMMAW1REG, val);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700175 }
176
177 if (setup->master_memory2 != NULL) {
178 master = setup->master_memory2;
179 val = IBA(master->bus_base_address) |
180 MASTER_MSK(master->address_mask) |
181 WINEN |
182 PCIA(master->pci_base_address);
Yoichi Yuasa5dfa9c12005-04-16 15:24:40 -0700183 pciu_write(PCIMMAW2REG, val);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700184 } else {
Yoichi Yuasa5dfa9c12005-04-16 15:24:40 -0700185 val = pciu_read(PCIMMAW2REG);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700186 val &= ~WINEN;
Yoichi Yuasa5dfa9c12005-04-16 15:24:40 -0700187 pciu_write(PCIMMAW2REG, val);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700188 }
189
190 if (setup->target_memory1 != NULL) {
191 target = setup->target_memory1;
192 val = TARGET_MSK(target->address_mask) |
193 WINEN |
194 ITA(target->bus_base_address);
Yoichi Yuasa5dfa9c12005-04-16 15:24:40 -0700195 pciu_write(PCITAW1REG, val);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700196 } else {
Yoichi Yuasa5dfa9c12005-04-16 15:24:40 -0700197 val = pciu_read(PCITAW1REG);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700198 val &= ~WINEN;
Yoichi Yuasa5dfa9c12005-04-16 15:24:40 -0700199 pciu_write(PCITAW1REG, val);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700200 }
201
202 if (setup->target_memory2 != NULL) {
203 target = setup->target_memory2;
204 val = TARGET_MSK(target->address_mask) |
205 WINEN |
206 ITA(target->bus_base_address);
Yoichi Yuasa5dfa9c12005-04-16 15:24:40 -0700207 pciu_write(PCITAW2REG, val);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700208 } else {
Yoichi Yuasa5dfa9c12005-04-16 15:24:40 -0700209 val = pciu_read(PCITAW2REG);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700210 val &= ~WINEN;
Yoichi Yuasa5dfa9c12005-04-16 15:24:40 -0700211 pciu_write(PCITAW2REG, val);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700212 }
213
214 if (setup->master_io != NULL) {
215 master = setup->master_io;
216 val = IBA(master->bus_base_address) |
217 MASTER_MSK(master->address_mask) |
218 WINEN |
219 PCIIA(master->pci_base_address);
Yoichi Yuasa5dfa9c12005-04-16 15:24:40 -0700220 pciu_write(PCIMIOAWREG, val);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700221 } else {
Yoichi Yuasa5dfa9c12005-04-16 15:24:40 -0700222 val = pciu_read(PCIMIOAWREG);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700223 val &= ~WINEN;
Yoichi Yuasa5dfa9c12005-04-16 15:24:40 -0700224 pciu_write(PCIMIOAWREG, val);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700225 }
226
227 if (setup->exclusive_access == CANNOT_LOCK_FROM_DEVICE)
Yoichi Yuasa5dfa9c12005-04-16 15:24:40 -0700228 pciu_write(PCIEXACCREG, UNLOCK);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700229 else
Yoichi Yuasa5dfa9c12005-04-16 15:24:40 -0700230 pciu_write(PCIEXACCREG, 0);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700231
Ralf Baechle10cc3522007-10-11 23:46:15 +0100232 if (current_cpu_type() == CPU_VR4122)
Yoichi Yuasa5dfa9c12005-04-16 15:24:40 -0700233 pciu_write(PCITRDYVREG, TRDYV(setup->wait_time_limit_from_irdy_to_trdy));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700234
Yoichi Yuasa5dfa9c12005-04-16 15:24:40 -0700235 pciu_write(LATTIMEREG, MLTIM(setup->master_latency_timer));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700236
237 if (setup->mailbox != NULL) {
238 mailbox = setup->mailbox;
239 val = MBADD(mailbox->base_address) | TYPE_32BITSPACE |
240 MSI_MEMORY | PREF_APPROVAL;
Yoichi Yuasa5dfa9c12005-04-16 15:24:40 -0700241 pciu_write(MAILBAREG, val);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700242 }
243
244 if (setup->target_window1) {
245 window = setup->target_window1;
246 val = PMBA(window->base_address) | TYPE_32BITSPACE |
247 MSI_MEMORY | PREF_APPROVAL;
Yoichi Yuasa5dfa9c12005-04-16 15:24:40 -0700248 pciu_write(PCIMBA1REG, val);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700249 }
250
251 if (setup->target_window2) {
252 window = setup->target_window2;
253 val = PMBA(window->base_address) | TYPE_32BITSPACE |
254 MSI_MEMORY | PREF_APPROVAL;
Yoichi Yuasa5dfa9c12005-04-16 15:24:40 -0700255 pciu_write(PCIMBA2REG, val);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700256 }
257
Yoichi Yuasa5dfa9c12005-04-16 15:24:40 -0700258 val = pciu_read(RETVALREG);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700259 val &= ~RTYVAL_MASK;
260 val |= RTYVAL(setup->retry_limit);
Yoichi Yuasa5dfa9c12005-04-16 15:24:40 -0700261 pciu_write(RETVALREG, val);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700262
Yoichi Yuasa5dfa9c12005-04-16 15:24:40 -0700263 val = pciu_read(PCIAPCNTREG);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700264 val &= ~(TKYGNT | PAPC);
265
266 switch (setup->arbiter_priority_control) {
267 case PCI_ARBITRATION_MODE_ALTERNATE_0:
268 val |= PAPC_ALTERNATE_0;
269 break;
270 case PCI_ARBITRATION_MODE_ALTERNATE_B:
271 val |= PAPC_ALTERNATE_B;
272 break;
273 default:
274 val |= PAPC_FAIR;
275 break;
276 }
277
278 if (setup->take_away_gnt_mode == PCI_TAKE_AWAY_GNT_ENABLE)
279 val |= TKYGNT_ENABLE;
280
Yoichi Yuasa5dfa9c12005-04-16 15:24:40 -0700281 pciu_write(PCIAPCNTREG, val);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700282
Yoichi Yuasa5dfa9c12005-04-16 15:24:40 -0700283 pciu_write(COMMANDREG, PCI_COMMAND_IO | PCI_COMMAND_MEMORY |
284 PCI_COMMAND_MASTER | PCI_COMMAND_PARITY |
285 PCI_COMMAND_SERR);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700286
287 /* Clear bus error */
Yoichi Yuasa5dfa9c12005-04-16 15:24:40 -0700288 pciu_read(BUSERRADREG);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700289
Yoichi Yuasa5dfa9c12005-04-16 15:24:40 -0700290 pciu_write(PCIENREG, PCIU_CONFIG_DONE);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700291
292 if (setup->mem_resource != NULL)
293 vr41xx_pci_controller.mem_resource = setup->mem_resource;
294
295 if (setup->io_resource != NULL) {
296 vr41xx_pci_controller.io_resource = setup->io_resource;
297 } else {
298 set_io_port_base(IO_PORT_BASE);
299 ioport_resource.start = IO_PORT_RESOURCE_START;
300 ioport_resource.end = IO_PORT_RESOURCE_END;
301 }
302
303 register_pci_controller(&vr41xx_pci_controller);
304
305 return 0;
306}
307
308arch_initcall(vr41xx_pciu_init);