1 /*
2 * Copyright 2001 MontaVista Software Inc.
3 * Author: MontaVista Software, Inc.
4 * ahennessy@mvista.com
5 *
6 * Copyright (C) 2000-2001 Toshiba Corporation
7 * Copyright (C) 2004 by Ralf Baechle (ralf@linux-mips.org)
8 *
9 * Based on arch/mips/ddb5xxx/ddb5477/pci_ops.c
10 *
11 * Define the pci_ops for TX3927.
12 *
13 * Much of the code is derived from the original DDB5074 port by
14 * Geert Uytterhoeven <geert@linux-m68k.org>
15 *
16 * This program is free software; you can redistribute it and/or modify it
17 * under the terms of the GNU General Public License as published by the
18 * Free Software Foundation; either version 2 of the License, or (at your
19 * option) any later version.
20 *
21 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
22 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
23 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN
24 * NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
25 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
26 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
27 * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
28 * ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
29 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
30 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
31 *
32 * You should have received a copy of the GNU General Public License along
33 * with this program; if not, write to the Free Software Foundation, Inc.,
34 * 675 Mass Ave, Cambridge, MA 02139, USA.
35 */
36 #include <linux/types.h>
37 #include <linux/pci.h>
38 #include <linux/kernel.h>
39 #include <linux/init.h>
40 #include <linux/interrupt.h>
41 #include <linux/irq.h>
42
43 #include <asm/addrspace.h>
44 #include <asm/txx9irq.h>
45 #include <asm/txx9/pci.h>
46 #include <asm/txx9/tx3927.h>
47
mkaddr(struct pci_bus * bus,unsigned char devfn,unsigned char where)48 static int mkaddr(struct pci_bus *bus, unsigned char devfn, unsigned char where)
49 {
50 if (bus->parent == NULL &&
51 devfn >= PCI_DEVFN(TX3927_PCIC_MAX_DEVNU, 0))
52 return -1;
53 tx3927_pcicptr->ica =
54 ((bus->number & 0xff) << 0x10) |
55 ((devfn & 0xff) << 0x08) |
56 (where & 0xfc) | (bus->parent ? 1 : 0);
57
58 /* clear M_ABORT and Disable M_ABORT Int. */
59 tx3927_pcicptr->pcistat |= PCI_STATUS_REC_MASTER_ABORT;
60 tx3927_pcicptr->pcistatim &= ~PCI_STATUS_REC_MASTER_ABORT;
61 return 0;
62 }
63
check_abort(void)64 static inline int check_abort(void)
65 {
66 if (tx3927_pcicptr->pcistat & PCI_STATUS_REC_MASTER_ABORT) {
67 tx3927_pcicptr->pcistat |= PCI_STATUS_REC_MASTER_ABORT;
68 tx3927_pcicptr->pcistatim |= PCI_STATUS_REC_MASTER_ABORT;
69 /* flush write buffer */
70 iob();
71 return PCIBIOS_DEVICE_NOT_FOUND;
72 }
73 return PCIBIOS_SUCCESSFUL;
74 }
75
tx3927_pci_read_config(struct pci_bus * bus,unsigned int devfn,int where,int size,u32 * val)76 static int tx3927_pci_read_config(struct pci_bus *bus, unsigned int devfn,
77 int where, int size, u32 * val)
78 {
79 if (mkaddr(bus, devfn, where)) {
80 *val = 0xffffffff;
81 return PCIBIOS_DEVICE_NOT_FOUND;
82 }
83
84 switch (size) {
85 case 1:
86 *val = *(volatile u8 *) ((unsigned long) & tx3927_pcicptr->icd | (where & 3));
87 break;
88
89 case 2:
90 *val = le16_to_cpu(*(volatile u16 *) ((unsigned long) & tx3927_pcicptr->icd | (where & 3)));
91 break;
92
93 case 4:
94 *val = le32_to_cpu(tx3927_pcicptr->icd);
95 break;
96 }
97
98 return check_abort();
99 }
100
tx3927_pci_write_config(struct pci_bus * bus,unsigned int devfn,int where,int size,u32 val)101 static int tx3927_pci_write_config(struct pci_bus *bus, unsigned int devfn,
102 int where, int size, u32 val)
103 {
104 if (mkaddr(bus, devfn, where))
105 return PCIBIOS_DEVICE_NOT_FOUND;
106
107 switch (size) {
108 case 1:
109 *(volatile u8 *) ((unsigned long) & tx3927_pcicptr->icd | (where & 3)) = val;
110 break;
111
112 case 2:
113 *(volatile u16 *) ((unsigned long) & tx3927_pcicptr->icd | (where & 2)) =
114 cpu_to_le16(val);
115 break;
116
117 case 4:
118 tx3927_pcicptr->icd = cpu_to_le32(val);
119 }
120
121 return check_abort();
122 }
123
124 static struct pci_ops tx3927_pci_ops = {
125 .read = tx3927_pci_read_config,
126 .write = tx3927_pci_write_config,
127 };
128
tx3927_pcic_setup(struct pci_controller * channel,unsigned long sdram_size,int extarb)129 void __init tx3927_pcic_setup(struct pci_controller *channel,
130 unsigned long sdram_size, int extarb)
131 {
132 unsigned long flags;
133 unsigned long io_base =
134 channel->io_resource->start + mips_io_port_base - IO_BASE;
135 unsigned long io_size =
136 channel->io_resource->end - channel->io_resource->start;
137 unsigned long io_pciaddr =
138 channel->io_resource->start - channel->io_offset;
139 unsigned long mem_base =
140 channel->mem_resource->start;
141 unsigned long mem_size =
142 channel->mem_resource->end - channel->mem_resource->start;
143 unsigned long mem_pciaddr =
144 channel->mem_resource->start - channel->mem_offset;
145
146 printk(KERN_INFO "TX3927 PCIC -- DID:%04x VID:%04x RID:%02x Arbiter:%s",
147 tx3927_pcicptr->did, tx3927_pcicptr->vid,
148 tx3927_pcicptr->rid,
149 extarb ? "External" : "Internal");
150 channel->pci_ops = &tx3927_pci_ops;
151
152 local_irq_save(flags);
153 /* Disable External PCI Config. Access */
154 tx3927_pcicptr->lbc = TX3927_PCIC_LBC_EPCAD;
155 #ifdef __BIG_ENDIAN
156 tx3927_pcicptr->lbc |= TX3927_PCIC_LBC_IBSE |
157 TX3927_PCIC_LBC_TIBSE |
158 TX3927_PCIC_LBC_TMFBSE | TX3927_PCIC_LBC_MSDSE;
159 #endif
160 /* LB->PCI mappings */
161 tx3927_pcicptr->iomas = ~(io_size - 1);
162 tx3927_pcicptr->ilbioma = io_base;
163 tx3927_pcicptr->ipbioma = io_pciaddr;
164 tx3927_pcicptr->mmas = ~(mem_size - 1);
165 tx3927_pcicptr->ilbmma = mem_base;
166 tx3927_pcicptr->ipbmma = mem_pciaddr;
167 /* PCI->LB mappings */
168 tx3927_pcicptr->iobas = 0xffffffff;
169 tx3927_pcicptr->ioba = 0;
170 tx3927_pcicptr->tlbioma = 0;
171 tx3927_pcicptr->mbas = ~(sdram_size - 1);
172 tx3927_pcicptr->mba = 0;
173 tx3927_pcicptr->tlbmma = 0;
174 /* Enable Direct mapping Address Space Decoder */
175 tx3927_pcicptr->lbc |= TX3927_PCIC_LBC_ILMDE | TX3927_PCIC_LBC_ILIDE;
176
177 /* Clear All Local Bus Status */
178 tx3927_pcicptr->lbstat = TX3927_PCIC_LBIM_ALL;
179 /* Enable All Local Bus Interrupts */
180 tx3927_pcicptr->lbim = TX3927_PCIC_LBIM_ALL;
181 /* Clear All PCI Status Error */
182 tx3927_pcicptr->pcistat = TX3927_PCIC_PCISTATIM_ALL;
183 /* Enable All PCI Status Error Interrupts */
184 tx3927_pcicptr->pcistatim = TX3927_PCIC_PCISTATIM_ALL;
185
186 /* PCIC Int => IRC IRQ10 */
187 tx3927_pcicptr->il = TX3927_IR_PCI;
188 /* Target Control (per errata) */
189 tx3927_pcicptr->tc = TX3927_PCIC_TC_OF8E | TX3927_PCIC_TC_IF8E;
190
191 /* Enable Bus Arbiter */
192 if (!extarb)
193 tx3927_pcicptr->pbapmc = TX3927_PCIC_PBAPMC_PBAEN;
194
195 tx3927_pcicptr->pcicmd = PCI_COMMAND_MASTER |
196 PCI_COMMAND_MEMORY |
197 PCI_COMMAND_IO |
198 PCI_COMMAND_PARITY | PCI_COMMAND_SERR;
199 local_irq_restore(flags);
200 }
201
tx3927_pcierr_interrupt(int irq,void * dev_id)202 static irqreturn_t tx3927_pcierr_interrupt(int irq, void *dev_id)
203 {
204 struct pt_regs *regs = get_irq_regs();
205
206 if (txx9_pci_err_action != TXX9_PCI_ERR_IGNORE) {
207 printk(KERN_WARNING "PCI error interrupt at 0x%08lx.\n",
208 regs->cp0_epc);
209 printk(KERN_WARNING "pcistat:%02x, lbstat:%04lx\n",
210 tx3927_pcicptr->pcistat, tx3927_pcicptr->lbstat);
211 }
212 if (txx9_pci_err_action != TXX9_PCI_ERR_PANIC) {
213 /* clear all pci errors */
214 tx3927_pcicptr->pcistat |= TX3927_PCIC_PCISTATIM_ALL;
215 tx3927_pcicptr->istat = TX3927_PCIC_IIM_ALL;
216 tx3927_pcicptr->tstat = TX3927_PCIC_TIM_ALL;
217 tx3927_pcicptr->lbstat = TX3927_PCIC_LBIM_ALL;
218 return IRQ_HANDLED;
219 }
220 console_verbose();
221 panic("PCI error.");
222 }
223
tx3927_setup_pcierr_irq(void)224 void __init tx3927_setup_pcierr_irq(void)
225 {
226 if (request_irq(TXX9_IRQ_BASE + TX3927_IR_PCI,
227 tx3927_pcierr_interrupt,
228 0, "PCI error",
229 (void *)TX3927_PCIC_REG))
230 printk(KERN_WARNING "Failed to request irq for PCIERR\n");
231 }
232