arch/mips/pci/ops-tx3927.c

   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
  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
  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
  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
 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
 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
 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
 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 }