ops-tx3927.c
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/*
* Copyright 2001 MontaVista Software Inc.
* Author: MontaVista Software, Inc.
* ahennessy@mvista.com
*
* Copyright (C) 2000-2001 Toshiba Corporation
* Copyright (C) 2004 by Ralf Baechle (ralf@linux-mips.org)
*
* Based on arch/mips/ddb5xxx/ddb5477/pci_ops.c
*
* Define the pci_ops for TX3927.
*
* Much of the code is derived from the original DDB5074 port by
* Geert Uytterhoeven <geert@sonycom.com>
*
* 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 SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN
* NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
* USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
* ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*
* 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.
*/
#include <linux/types.h>
#include <linux/pci.h>
#include <linux/kernel.h>
#include <linux/init.h>
#include <linux/interrupt.h>
#include <linux/irq.h>
#include <asm/addrspace.h>
#include <asm/txx9irq.h>
#include <asm/txx9/pci.h>
#include <asm/txx9/tx3927.h>
static int mkaddr(struct pci_bus *bus, unsigned char devfn, unsigned char where)
{
if (bus->parent == NULL &&
devfn >= PCI_DEVFN(TX3927_PCIC_MAX_DEVNU, 0))
return -1;
tx3927_pcicptr->ica =
((bus->number & 0xff) << 0x10) |
((devfn & 0xff) << 0x08) |
(where & 0xfc) | (bus->parent ? 1 : 0);
/* clear M_ABORT and Disable M_ABORT Int. */
tx3927_pcicptr->pcistat |= PCI_STATUS_REC_MASTER_ABORT;
tx3927_pcicptr->pcistatim &= ~PCI_STATUS_REC_MASTER_ABORT;
return 0;
}
static inline int check_abort(void)
{
if (tx3927_pcicptr->pcistat & PCI_STATUS_REC_MASTER_ABORT) {
tx3927_pcicptr->pcistat |= PCI_STATUS_REC_MASTER_ABORT;
tx3927_pcicptr->pcistatim |= PCI_STATUS_REC_MASTER_ABORT;
/* flush write buffer */
iob();
return PCIBIOS_DEVICE_NOT_FOUND;
}
return PCIBIOS_SUCCESSFUL;
}
static int tx3927_pci_read_config(struct pci_bus *bus, unsigned int devfn,
int where, int size, u32 * val)
{
if (mkaddr(bus, devfn, where)) {
*val = 0xffffffff;
return PCIBIOS_DEVICE_NOT_FOUND;
}
switch (size) {
case 1:
*val = *(volatile u8 *) ((unsigned long) & tx3927_pcicptr->icd | (where & 3));
break;
case 2:
*val = le16_to_cpu(*(volatile u16 *) ((unsigned long) & tx3927_pcicptr->icd | (where & 3)));
break;
case 4:
*val = le32_to_cpu(tx3927_pcicptr->icd);
break;
}
return check_abort();
}
static int tx3927_pci_write_config(struct pci_bus *bus, unsigned int devfn,
int where, int size, u32 val)
{
if (mkaddr(bus, devfn, where))
return PCIBIOS_DEVICE_NOT_FOUND;
switch (size) {
case 1:
*(volatile u8 *) ((unsigned long) & tx3927_pcicptr->icd | (where & 3)) = val;
break;
case 2:
*(volatile u16 *) ((unsigned long) & tx3927_pcicptr->icd | (where & 2)) =
cpu_to_le16(val);
break;
case 4:
tx3927_pcicptr->icd = cpu_to_le32(val);
}
return check_abort();
}
static struct pci_ops tx3927_pci_ops = {
.read = tx3927_pci_read_config,
.write = tx3927_pci_write_config,
};
void __init tx3927_pcic_setup(struct pci_controller *channel,
unsigned long sdram_size, int extarb)
{
unsigned long flags;
unsigned long io_base =
channel->io_resource->start + mips_io_port_base - IO_BASE;
unsigned long io_size =
channel->io_resource->end - channel->io_resource->start;
unsigned long io_pciaddr =
channel->io_resource->start - channel->io_offset;
unsigned long mem_base =
channel->mem_resource->start;
unsigned long mem_size =
channel->mem_resource->end - channel->mem_resource->start;
unsigned long mem_pciaddr =
channel->mem_resource->start - channel->mem_offset;
printk(KERN_INFO "TX3927 PCIC -- DID:%04x VID:%04x RID:%02x Arbiter:%s",
tx3927_pcicptr->did, tx3927_pcicptr->vid,
tx3927_pcicptr->rid,
extarb ? "External" : "Internal");
channel->pci_ops = &tx3927_pci_ops;
local_irq_save(flags);
/* Disable External PCI Config. Access */
tx3927_pcicptr->lbc = TX3927_PCIC_LBC_EPCAD;
#ifdef __BIG_ENDIAN
tx3927_pcicptr->lbc |= TX3927_PCIC_LBC_IBSE |
TX3927_PCIC_LBC_TIBSE |
TX3927_PCIC_LBC_TMFBSE | TX3927_PCIC_LBC_MSDSE;
#endif
/* LB->PCI mappings */
tx3927_pcicptr->iomas = ~(io_size - 1);
tx3927_pcicptr->ilbioma = io_base;
tx3927_pcicptr->ipbioma = io_pciaddr;
tx3927_pcicptr->mmas = ~(mem_size - 1);
tx3927_pcicptr->ilbmma = mem_base;
tx3927_pcicptr->ipbmma = mem_pciaddr;
/* PCI->LB mappings */
tx3927_pcicptr->iobas = 0xffffffff;
tx3927_pcicptr->ioba = 0;
tx3927_pcicptr->tlbioma = 0;
tx3927_pcicptr->mbas = ~(sdram_size - 1);
tx3927_pcicptr->mba = 0;
tx3927_pcicptr->tlbmma = 0;
/* Enable Direct mapping Address Space Decoder */
tx3927_pcicptr->lbc |= TX3927_PCIC_LBC_ILMDE | TX3927_PCIC_LBC_ILIDE;
/* Clear All Local Bus Status */
tx3927_pcicptr->lbstat = TX3927_PCIC_LBIM_ALL;
/* Enable All Local Bus Interrupts */
tx3927_pcicptr->lbim = TX3927_PCIC_LBIM_ALL;
/* Clear All PCI Status Error */
tx3927_pcicptr->pcistat = TX3927_PCIC_PCISTATIM_ALL;
/* Enable All PCI Status Error Interrupts */
tx3927_pcicptr->pcistatim = TX3927_PCIC_PCISTATIM_ALL;
/* PCIC Int => IRC IRQ10 */
tx3927_pcicptr->il = TX3927_IR_PCI;
/* Target Control (per errata) */
tx3927_pcicptr->tc = TX3927_PCIC_TC_OF8E | TX3927_PCIC_TC_IF8E;
/* Enable Bus Arbiter */
if (!extarb)
tx3927_pcicptr->pbapmc = TX3927_PCIC_PBAPMC_PBAEN;
tx3927_pcicptr->pcicmd = PCI_COMMAND_MASTER |
PCI_COMMAND_MEMORY |
PCI_COMMAND_IO |
PCI_COMMAND_PARITY | PCI_COMMAND_SERR;
local_irq_restore(flags);
}
static irqreturn_t tx3927_pcierr_interrupt(int irq, void *dev_id)
{
struct pt_regs *regs = get_irq_regs();
if (txx9_pci_err_action != TXX9_PCI_ERR_IGNORE) {
printk(KERN_WARNING "PCI error interrupt at 0x%08lx.\n",
regs->cp0_epc);
printk(KERN_WARNING "pcistat:%02x, lbstat:%04lx\n",
tx3927_pcicptr->pcistat, tx3927_pcicptr->lbstat);
}
if (txx9_pci_err_action != TXX9_PCI_ERR_PANIC) {
/* clear all pci errors */
tx3927_pcicptr->pcistat |= TX3927_PCIC_PCISTATIM_ALL;
tx3927_pcicptr->istat = TX3927_PCIC_IIM_ALL;
tx3927_pcicptr->tstat = TX3927_PCIC_TIM_ALL;
tx3927_pcicptr->lbstat = TX3927_PCIC_LBIM_ALL;
return IRQ_HANDLED;
}
console_verbose();
panic("PCI error.");
}
void __init tx3927_setup_pcierr_irq(void)
{
if (request_irq(TXX9_IRQ_BASE + TX3927_IR_PCI,
tx3927_pcierr_interrupt,
0, "PCI error",
(void *)TX3927_PCIC_REG))
printk(KERN_WARNING "Failed to request irq for PCIERR\n");
}