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linux-stable-rt/arch/ppc/platforms/adir_pci.c

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/*
* arch/ppc/platforms/adir_pci.c
*
* PCI support for SBS Adirondack
*
* By Michael Sokolov <msokolov@ivan.Harhan.ORG>
* based on the K2 version by Matt Porter <mporter@mvista.com>
*/
#include <linux/kernel.h>
#include <linux/init.h>
#include <linux/pci.h>
#include <linux/slab.h>
#include <asm/byteorder.h>
#include <asm/io.h>
#include <asm/uaccess.h>
#include <asm/machdep.h>
#include <asm/pci-bridge.h>
#include <syslib/cpc710.h>
#include "adir.h"
#undef DEBUG
#ifdef DEBUG
#define DBG(x...) printk(x)
#else
#define DBG(x...)
#endif /* DEBUG */
static inline int __init
adir_map_irq(struct pci_dev *dev, unsigned char idsel, unsigned char pin)
{
#define PCIIRQ(a,b,c,d) {ADIR_IRQ_##a,ADIR_IRQ_##b,ADIR_IRQ_##c,ADIR_IRQ_##d},
struct pci_controller *hose = pci_bus_to_hose(dev->bus->number);
/*
* The three PCI devices on the motherboard have dedicated lines to the
* CPLD interrupt controller, bypassing the standard PCI INTA-D and the
* PC interrupt controller. All other PCI devices (slots) have usual
* staggered INTA-D lines, resulting in 8 lines total (PCI0 INTA-D and
* PCI1 INTA-D). All 8 go to the CPLD interrupt controller. PCI0 INTA-D
* also go to the south bridge, so we have the option of taking them
* via the CPLD interrupt controller or via the south bridge 8259
* 8258 thingy. PCI1 INTA-D can only be taken via the CPLD interrupt
* controller. We take all PCI interrupts via the CPLD interrupt
* controller as recommended by SBS.
*
* We also have some monkey business with the PCI devices within the
* VT82C686B south bridge itself. This chip actually has 7 functions on
* its IDSEL. Function 0 is the actual south bridge, function 1 is IDE,
* and function 4 is some special stuff. The other 4 functions are just
* regular PCI devices bundled in the chip. 2 and 3 are USB UHCIs and 5
* and 6 are audio (not supported on the Adirondack).
*
* This is where the monkey business begins. PCI devices are supposed
* to signal normal PCI interrupts. But the 4 functions in question are
* located in the south bridge chip, which is designed with the
* assumption that it will be fielding PCI INTA-D interrupts rather
* than generating them. Here's what it does. Each of the functions in
* question routes its interrupt to one of the IRQs on the 8259 thingy.
* Which one? It looks at the Interrupt Line register in the PCI config
* space, even though the PCI spec says it's for BIOS/OS interaction
* only.
*
* How do we deal with this? We take these interrupts via 8259 IRQs as
* we have to. We return the desired IRQ numbers from this routine when
* called for the functions in question. The PCI scan code will then
* stick our return value into the Interrupt Line register in the PCI
* config space, and the interrupt will actually go there. We identify
* these functions within the south bridge IDSEL by their interrupt pin
* numbers, as the VT82C686B has 04 in the Interrupt Pin register for
* USB and 03 for audio.
*/
if (!hose->index) {
static char pci_irq_table[][4] =
/*
* PCI IDSEL/INTPIN->INTLINE
* A B C D
*/
{
/* south bridge */ PCIIRQ(IDE0, NONE, VIA_AUDIO, VIA_USB)
/* Ethernet 0 */ PCIIRQ(MBETH0, MBETH0, MBETH0, MBETH0)
/* PCI0 slot 1 */ PCIIRQ(PCI0_INTB, PCI0_INTC, PCI0_INTD, PCI0_INTA)
/* PCI0 slot 2 */ PCIIRQ(PCI0_INTC, PCI0_INTD, PCI0_INTA, PCI0_INTB)
/* PCI0 slot 3 */ PCIIRQ(PCI0_INTD, PCI0_INTA, PCI0_INTB, PCI0_INTC)
};
const long min_idsel = 3, max_idsel = 7, irqs_per_slot = 4;
return PCI_IRQ_TABLE_LOOKUP;
} else {
static char pci_irq_table[][4] =
/*
* PCI IDSEL/INTPIN->INTLINE
* A B C D
*/
{
/* Ethernet 1 */ PCIIRQ(MBETH1, MBETH1, MBETH1, MBETH1)
/* SCSI */ PCIIRQ(MBSCSI, MBSCSI, MBSCSI, MBSCSI)
/* PCI1 slot 1 */ PCIIRQ(PCI1_INTB, PCI1_INTC, PCI1_INTD, PCI1_INTA)
/* PCI1 slot 2 */ PCIIRQ(PCI1_INTC, PCI1_INTD, PCI1_INTA, PCI1_INTB)
/* PCI1 slot 3 */ PCIIRQ(PCI1_INTD, PCI1_INTA, PCI1_INTB, PCI1_INTC)
};
const long min_idsel = 3, max_idsel = 7, irqs_per_slot = 4;
return PCI_IRQ_TABLE_LOOKUP;
}
#undef PCIIRQ
}
static void
adir_pcibios_fixup_resources(struct pci_dev *dev)
{
int i;
if ((dev->vendor == PCI_VENDOR_ID_IBM) &&
(dev->device == PCI_DEVICE_ID_IBM_CPC710_PCI64))
{
DBG("Fixup CPC710 resources\n");
for (i=0; i<DEVICE_COUNT_RESOURCE; i++)
{
dev->resource[i].start = 0;
dev->resource[i].end = 0;
}
}
}
/*
* CPC710 DD3 has an errata causing it to hang the system if a type 0 config
* cycle is attempted on its PCI32 interface with a device number > 21.
* CPC710's PCI bridges map device numbers 1 through 21 to AD11 through AD31.
* Per the PCI spec it MUST accept all other device numbers and do nothing, and
* software MUST scan all device numbers without assuming how IDSELs are
* mapped. However, as the CPC710 DD3's errata causes such correct scanning
* procedure to hang the system, we have no choice but to introduce this hack
* of knowingly avoiding device numbers > 21 on PCI0,
*/
static int
adir_exclude_device(u_char bus, u_char devfn)
{
if ((bus == 0) && (PCI_SLOT(devfn) > 21))
return PCIBIOS_DEVICE_NOT_FOUND;
else
return PCIBIOS_SUCCESSFUL;
}
void adir_find_bridges(void)
{
struct pci_controller *hose_a, *hose_b;
/* Setup PCI32 hose */
hose_a = pcibios_alloc_controller();
if (!hose_a)
return;
hose_a->first_busno = 0;
hose_a->last_busno = 0xff;
hose_a->pci_mem_offset = ADIR_PCI32_MEM_BASE;
hose_a->io_space.start = 0;
hose_a->io_space.end = ADIR_PCI32_VIRT_IO_SIZE - 1;
hose_a->mem_space.start = 0;
hose_a->mem_space.end = ADIR_PCI32_MEM_SIZE - 1;
hose_a->io_resource.start = 0;
hose_a->io_resource.end = ADIR_PCI32_VIRT_IO_SIZE - 1;
hose_a->io_resource.flags = IORESOURCE_IO;
hose_a->mem_resources[0].start = ADIR_PCI32_MEM_BASE;
hose_a->mem_resources[0].end = ADIR_PCI32_MEM_BASE +
ADIR_PCI32_MEM_SIZE - 1;
hose_a->mem_resources[0].flags = IORESOURCE_MEM;
hose_a->io_base_phys = ADIR_PCI32_IO_BASE;
hose_a->io_base_virt = (void *) ADIR_PCI32_VIRT_IO_BASE;
ppc_md.pci_exclude_device = adir_exclude_device;
setup_indirect_pci(hose_a, ADIR_PCI32_CONFIG_ADDR,
ADIR_PCI32_CONFIG_DATA);
/* Initialize PCI32 bus registers */
early_write_config_byte(hose_a,
hose_a->first_busno,
PCI_DEVFN(0, 0),
CPC710_BUS_NUMBER,
hose_a->first_busno);
early_write_config_byte(hose_a,
hose_a->first_busno,
PCI_DEVFN(0, 0),
CPC710_SUB_BUS_NUMBER,
hose_a->last_busno);
hose_a->last_busno = pciauto_bus_scan(hose_a, hose_a->first_busno);
/* Write out correct max subordinate bus number for hose A */
early_write_config_byte(hose_a,
hose_a->first_busno,
PCI_DEVFN(0, 0),
CPC710_SUB_BUS_NUMBER,
hose_a->last_busno);
/* Setup PCI64 hose */
hose_b = pcibios_alloc_controller();
if (!hose_b)
return;
hose_b->first_busno = hose_a->last_busno + 1;
hose_b->last_busno = 0xff;
hose_b->pci_mem_offset = ADIR_PCI64_MEM_BASE;
hose_b->io_space.start = 0;
hose_b->io_space.end = ADIR_PCI64_VIRT_IO_SIZE - 1;
hose_b->mem_space.start = 0;
hose_b->mem_space.end = ADIR_PCI64_MEM_SIZE - 1;
hose_b->io_resource.start = 0;
hose_b->io_resource.end = ADIR_PCI64_VIRT_IO_SIZE - 1;
hose_b->io_resource.flags = IORESOURCE_IO;
hose_b->mem_resources[0].start = ADIR_PCI64_MEM_BASE;
hose_b->mem_resources[0].end = ADIR_PCI64_MEM_BASE +
ADIR_PCI64_MEM_SIZE - 1;
hose_b->mem_resources[0].flags = IORESOURCE_MEM;
hose_b->io_base_phys = ADIR_PCI64_IO_BASE;
hose_b->io_base_virt = (void *) ADIR_PCI64_VIRT_IO_BASE;
setup_indirect_pci(hose_b, ADIR_PCI64_CONFIG_ADDR,
ADIR_PCI64_CONFIG_DATA);
/* Initialize PCI64 bus registers */
early_write_config_byte(hose_b,
0,
PCI_DEVFN(0, 0),
CPC710_SUB_BUS_NUMBER,
0xff);
early_write_config_byte(hose_b,
0,
PCI_DEVFN(0, 0),
CPC710_BUS_NUMBER,
hose_b->first_busno);
hose_b->last_busno = pciauto_bus_scan(hose_b,
hose_b->first_busno);
/* Write out correct max subordinate bus number for hose B */
early_write_config_byte(hose_b,
hose_b->first_busno,
PCI_DEVFN(0, 0),
CPC710_SUB_BUS_NUMBER,
hose_b->last_busno);
ppc_md.pcibios_fixup = NULL;
ppc_md.pcibios_fixup_resources = adir_pcibios_fixup_resources;
ppc_md.pci_swizzle = common_swizzle;
ppc_md.pci_map_irq = adir_map_irq;
}
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