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Diffstat (limited to 'arch/mips/pci/ops-tx3927.c')
-rw-r--r--arch/mips/pci/ops-tx3927.c231
1 files changed, 231 insertions, 0 deletions
diff --git a/arch/mips/pci/ops-tx3927.c b/arch/mips/pci/ops-tx3927.c
new file mode 100644
index 000000000..d35dc9c9a
--- /dev/null
+++ b/arch/mips/pci/ops-tx3927.c
@@ -0,0 +1,231 @@
+/*
+ * 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@linux-m68k.org>
+ *
+ * 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");
+}
generated by cgit v1.2.3-54-g00ecf (git 2.45.2) at 2024-11-12 17:19:18 +0000