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/*
* Authors: Frank Rowand <frank_rowand@mvista.com>,
* Debbie Chu <debbie_chu@mvista.com>, or source@mvista.com
* Further modifications by Armin Kuster <akuster@mvista.com>
*
* 2000 (c) MontaVista, Software, Inc. This file is licensed under
* the terms of the GNU General Public License version 2. This program
* is licensed "as is" without any warranty of any kind, whether express
* or implied.
*
* Based on arch/ppc/kernel/indirect.c, Copyright (C) 1998 Gabriel Paubert.
*/
#include <linux/pci.h>
#include <asm/io.h>
#include <asm/system.h>
#include <asm/machdep.h>
#include <linux/init.h>
#include <linux/errno.h>
#include <asm/ocp.h>
#include <asm/ibm4xx.h>
#include <asm/pci-bridge.h>
#include <asm/ibm_ocp_pci.h>
extern void bios_fixup(struct pci_controller *, struct pcil0_regs *);
extern int ppc405_map_irq(struct pci_dev *dev, unsigned char idsel,
unsigned char pin);
void
ppc405_pcibios_fixup_resources(struct pci_dev *dev)
{
int i;
unsigned long max_host_addr;
unsigned long min_host_addr;
struct resource *res;
/*
* openbios puts some graphics cards in the same range as the host
* controller uses to map to SDRAM. Fix it.
*/
min_host_addr = 0;
max_host_addr = PPC405_PCI_MEM_BASE - 1;
for (i = 0; i < DEVICE_COUNT_RESOURCE; i++) {
res = dev->resource + i;
if (!res->start)
continue;
if ((res->flags & IORESOURCE_MEM) &&
(((res->start >= min_host_addr)
&& (res->start <= max_host_addr))
|| ((res->end >= min_host_addr)
&& (res->end <= max_host_addr))
|| ((res->start < min_host_addr)
&& (res->end > max_host_addr))
)
) {
/* force pcibios_assign_resources() to assign a new address */
res->end -= res->start;
res->start = 0;
}
}
}
static int
ppc4xx_exclude_device(unsigned char bus, unsigned char devfn)
{
/* We prevent us from seeing ourselves to avoid having
* the kernel try to remap our BAR #1 and fuck up bus
* master from external PCI devices
*/
return (bus == 0 && devfn == 0);
}
void
ppc4xx_find_bridges(void)
{
struct pci_controller *hose_a;
struct pcil0_regs *pcip;
unsigned int tmp_addr;
unsigned int tmp_size;
unsigned int reg_index;
unsigned int new_pmm_max = 0;
unsigned int new_pmm_min = 0;
isa_io_base = 0;
isa_mem_base = 0;
pci_dram_offset = 0;
#if (PSR_PCI_ARBIT_EN > 1)
/* Check if running in slave mode */
if ((mfdcr(DCRN_CHPSR) & PSR_PCI_ARBIT_EN) == 0) {
printk("Running as PCI slave, kernel PCI disabled !\n");
return;
}
#endif
/* Setup PCI32 hose */
hose_a = pcibios_alloc_controller();
if (!hose_a)
return;
setup_indirect_pci(hose_a, PPC405_PCI_CONFIG_ADDR,
PPC405_PCI_CONFIG_DATA);
pcip = ioremap(PPC4xx_PCI_LCFG_PADDR, PAGE_SIZE);
if (pcip != NULL) {
#if defined(CONFIG_BIOS_FIXUP)
bios_fixup(hose_a, pcip);
#endif
new_pmm_min = 0xffffffff;
for (reg_index = 0; reg_index < 3; reg_index++) {
tmp_size = in_le32(&pcip->pmm[reg_index].ma); // mask & attrs
/* test the enable bit */
if ((tmp_size & 0x1) == 0)
continue;
tmp_addr = in_le32(&pcip->pmm[reg_index].pcila); // PCI addr
if (tmp_addr < PPC405_PCI_PHY_MEM_BASE) {
printk(KERN_DEBUG
"Disabling mapping to PCI mem addr 0x%8.8x\n",
tmp_addr);
out_le32(&pcip->pmm[reg_index].ma, tmp_size & ~1); // *_PMMOMA
continue;
}
tmp_addr = in_le32(&pcip->pmm[reg_index].la); // *_PMMOLA
if (tmp_addr < new_pmm_min)
new_pmm_min = tmp_addr;
tmp_addr = tmp_addr +
(0xffffffff - (tmp_size & 0xffffc000));
if (tmp_addr > PPC405_PCI_UPPER_MEM) {
new_pmm_max = tmp_addr; // PPC405_PCI_UPPER_MEM
} else {
new_pmm_max = PPC405_PCI_UPPER_MEM;
}
} // for
iounmap(pcip);
}
hose_a->first_busno = 0;
hose_a->last_busno = 0xff;
hose_a->pci_mem_offset = 0;
/* Setup bridge memory/IO ranges & resources
* TODO: Handle firmwares setting up a legacy ISA mem base
*/
hose_a->io_space.start = PPC405_PCI_LOWER_IO;
hose_a->io_space.end = PPC405_PCI_UPPER_IO;
hose_a->mem_space.start = new_pmm_min;
hose_a->mem_space.end = new_pmm_max;
hose_a->io_base_phys = PPC405_PCI_PHY_IO_BASE;
hose_a->io_base_virt = ioremap(hose_a->io_base_phys, 0x10000);
hose_a->io_resource.start = 0;
hose_a->io_resource.end = PPC405_PCI_UPPER_IO - PPC405_PCI_LOWER_IO;
hose_a->io_resource.flags = IORESOURCE_IO;
hose_a->io_resource.name = "PCI I/O";
hose_a->mem_resources[0].start = new_pmm_min;
hose_a->mem_resources[0].end = new_pmm_max;
hose_a->mem_resources[0].flags = IORESOURCE_MEM;
hose_a->mem_resources[0].name = "PCI Memory";
isa_io_base = (int) hose_a->io_base_virt;
isa_mem_base = 0; /* ISA not implemented */
ISA_DMA_THRESHOLD = 0x00ffffff; /* ??? ISA not implemented */
/* Scan busses & initial setup by pci_auto */
hose_a->last_busno = pciauto_bus_scan(hose_a, hose_a->first_busno);
hose_a->last_busno = 0;
/* Setup ppc_md */
ppc_md.pcibios_fixup = NULL;
ppc_md.pci_exclude_device = ppc4xx_exclude_device;
ppc_md.pcibios_fixup_resources = ppc405_pcibios_fixup_resources;
ppc_md.pci_swizzle = common_swizzle;
ppc_md.pci_map_irq = ppc405_map_irq;
}
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