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pci-sh5.c

/*
 * Copyright (C) 2001 David J. Mckay (david.mckay@st.com)
 * Copyright (C) 2003, 2004 Paul Mundt
 * Copyright (C) 2004 Richard Curnow
 *
 * May be copied or modified under the terms of the GNU General Public
 * License.  See linux/COPYING for more information.
 *
 * Support functions for the SH5 PCI hardware.
 */

#include <linux/kernel.h>
#include <linux/rwsem.h>
#include <linux/smp.h>
#include <linux/interrupt.h>
#include <linux/init.h>
#include <linux/errno.h>
#include <linux/pci.h>
#include <linux/delay.h>
#include <linux/types.h>
#include <linux/irq.h>
#include <cpu/irq.h>
#include <asm/pci.h>
#include <asm/io.h>
#include "pci-sh5.h"

unsigned long pcicr_virt;
unsigned long PCI_IO_AREA;

/* Rounds a number UP to the nearest power of two. Used for
 * sizing the PCI window.
 */
static u32 __init r2p2(u32 num)
{
      int i = 31;
      u32 tmp = num;

      if (num == 0)
            return 0;

      do {
            if (tmp & (1 << 31))
                  break;
            i--;
            tmp <<= 1;
      } while (i >= 0);

      tmp = 1 << i;
      /* If the original number isn't a power of 2, round it up */
      if (tmp != num)
            tmp <<= 1;

      return tmp;
}

static irqreturn_t pcish5_err_irq(int irq, void *dev_id)
{
      struct pt_regs *regs = get_irq_regs();
      unsigned pci_int, pci_air, pci_cir, pci_aint;

      pci_int = SH5PCI_READ(INT);
      pci_cir = SH5PCI_READ(CIR);
      pci_air = SH5PCI_READ(AIR);

      if (pci_int) {
            printk("PCI INTERRUPT (at %08llx)!\n", regs->pc);
            printk("PCI INT -> 0x%x\n", pci_int & 0xffff);
            printk("PCI AIR -> 0x%x\n", pci_air);
            printk("PCI CIR -> 0x%x\n", pci_cir);
            SH5PCI_WRITE(INT, ~0);
      }

      pci_aint = SH5PCI_READ(AINT);
      if (pci_aint) {
            printk("PCI ARB INTERRUPT!\n");
            printk("PCI AINT -> 0x%x\n", pci_aint);
            printk("PCI AIR -> 0x%x\n", pci_air);
            printk("PCI CIR -> 0x%x\n", pci_cir);
            SH5PCI_WRITE(AINT, ~0);
      }

      return IRQ_HANDLED;
}

static irqreturn_t pcish5_serr_irq(int irq, void *dev_id)
{
      printk("SERR IRQ\n");

      return IRQ_NONE;
}

int __init sh5pci_init(unsigned long memStart, unsigned long memSize)
{
      u32 lsr0;
      u32 uval;

        if (request_irq(IRQ_ERR, pcish5_err_irq,
                        IRQF_DISABLED, "PCI Error",NULL) < 0) {
                printk(KERN_ERR "PCISH5: Cannot hook PCI_PERR interrupt\n");
                return -EINVAL;
        }

        if (request_irq(IRQ_SERR, pcish5_serr_irq,
                        IRQF_DISABLED, "PCI SERR interrupt", NULL) < 0) {
                printk(KERN_ERR "PCISH5: Cannot hook PCI_SERR interrupt\n");
                return -EINVAL;
        }

      pcicr_virt = onchip_remap(SH5PCI_ICR_BASE, 1024, "PCICR");
      if (!pcicr_virt) {
            panic("Unable to remap PCICR\n");
      }

      PCI_IO_AREA = onchip_remap(SH5PCI_IO_BASE, 0x10000, "PCIIO");
      if (!PCI_IO_AREA) {
            panic("Unable to remap PCIIO\n");
      }

      /* Clear snoop registers */
        SH5PCI_WRITE(CSCR0, 0);
        SH5PCI_WRITE(CSCR1, 0);

        /* Switch off interrupts */
        SH5PCI_WRITE(INTM,  0);
        SH5PCI_WRITE(AINTM, 0);
        SH5PCI_WRITE(PINTM, 0);

        /* Set bus active, take it out of reset */
        uval = SH5PCI_READ(CR);

      /* Set command Register */
        SH5PCI_WRITE(CR, uval | CR_LOCK_MASK | CR_CFINT| CR_FTO | CR_PFE |
                 CR_PFCS | CR_BMAM);

      uval=SH5PCI_READ(CR);

        /* Allow it to be a master */
      /* NB - WE DISABLE I/O ACCESS to stop overlap */
        /* set WAIT bit to enable stepping, an attempt to improve stability */
      SH5PCI_WRITE_SHORT(CSR_CMD,
                      PCI_COMMAND_MEMORY | PCI_COMMAND_MASTER |
                      PCI_COMMAND_WAIT);

        /*
        ** Set translation mapping memory in order to convert the address
        ** used for the main bus, to the PCI internal address.
        */
        SH5PCI_WRITE(MBR,0x40000000);

        /* Always set the max size 512M */
        SH5PCI_WRITE(MBMR, PCISH5_MEM_SIZCONV(512*1024*1024));

        /*
        ** I/O addresses are mapped at internal PCI specific address
        ** as is described into the configuration bridge table.
        ** These are changed to 0, to allow cards that have legacy
        ** io such as vga to function correctly. We set the SH5 IOBAR to
        ** 256K, which is a bit big as we can only have 64K of address space
        */

        SH5PCI_WRITE(IOBR,0x0);

        /* Set up a 256K window. Totally pointless waste  of address space */
        SH5PCI_WRITE(IOBMR,0);

      /* The SH5 has a HUGE 256K I/O region, which breaks the PCI spec.
       * Ideally, we would want to map the I/O region somewhere, but it
       * is so big this is not that easy!
         */
      SH5PCI_WRITE(CSR_IBAR0,~0);
      /* Set memory size value */
        memSize = memory_end - memory_start;

      /* Now we set up the mbars so the PCI bus can see the memory of
       * the machine */
      if (memSize < (1024 * 1024)) {
                printk(KERN_ERR "PCISH5: Ridiculous memory size of 0x%lx?\n",
                   memSize);
                return -EINVAL;
        }

        /* Set LSR 0 */
        lsr0 = (memSize > (512 * 1024 * 1024)) ? 0x1ff00001 :
            ((r2p2(memSize) - 0x100000) | 0x1);
        SH5PCI_WRITE(LSR0, lsr0);

        /* Set MBAR 0 */
        SH5PCI_WRITE(CSR_MBAR0, memory_start);
        SH5PCI_WRITE(LAR0, memory_start);

        SH5PCI_WRITE(CSR_MBAR1,0);
        SH5PCI_WRITE(LAR1,0);
        SH5PCI_WRITE(LSR1,0);

        /* Enable the PCI interrupts on the device */
        SH5PCI_WRITE(INTM,  ~0);
        SH5PCI_WRITE(AINTM, ~0);
        SH5PCI_WRITE(PINTM, ~0);

      return 0;
}

void __devinit pcibios_fixup_bus(struct pci_bus *bus)
{
      struct pci_dev *dev = bus->self;
      int i;

      if (dev) {
            for (i= 0; i < 3; i++) {
                  bus->resource[i] =
                        &dev->resource[PCI_BRIDGE_RESOURCES+i];
                  bus->resource[i]->name = bus->name;
            }
            bus->resource[0]->flags |= IORESOURCE_IO;
            bus->resource[1]->flags |= IORESOURCE_MEM;

            /* For now, propagate host limits to the bus;
             * we'll adjust them later. */
            bus->resource[0]->end = 64*1024 - 1 ;
            bus->resource[1]->end = PCIBIOS_MIN_MEM+(256*1024*1024)-1;
            bus->resource[0]->start = PCIBIOS_MIN_IO;
            bus->resource[1]->start = PCIBIOS_MIN_MEM;

            /* Turn off downstream PF memory address range by default */
            bus->resource[2]->start = 1024*1024;
            bus->resource[2]->end = bus->resource[2]->start - 1;
      }
}

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