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/* pci_common.c: PCI controller common support.
*
* Copyright (C) 1999, 2007 David S. Miller (davem@davemloft.net)
*/
#include <linux/string.h>
#include <linux/slab.h>
#include <linux/init.h>
#include <linux/pci.h>
#include <linux/device.h>
#include <asm/pbm.h>
#include <asm/prom.h>
#include <asm/of_device.h>
#include "pci_impl.h"
void pci_get_pbm_props(struct pci_pbm_info *pbm)
{
const u32 *val = of_get_property(pbm->prom_node, "bus-range", NULL);
pbm->pci_first_busno = val[0];
pbm->pci_last_busno = val[1];
val = of_get_property(pbm->prom_node, "ino-bitmap", NULL);
if (val) {
pbm->ino_bitmap = (((u64)val[1] << 32UL) |
((u64)val[0] << 0UL));
}
}
static void pci_register_legacy_regions(struct resource *io_res,
struct resource *mem_res)
{
struct resource *p;
/* VGA Video RAM. */
p = kzalloc(sizeof(*p), GFP_KERNEL);
if (!p)
return;
p->name = "Video RAM area";
p->start = mem_res->start + 0xa0000UL;
p->end = p->start + 0x1ffffUL;
p->flags = IORESOURCE_BUSY;
request_resource(mem_res, p);
p = kzalloc(sizeof(*p), GFP_KERNEL);
if (!p)
return;
p->name = "System ROM";
p->start = mem_res->start + 0xf0000UL;
p->end = p->start + 0xffffUL;
p->flags = IORESOURCE_BUSY;
request_resource(mem_res, p);
p = kzalloc(sizeof(*p), GFP_KERNEL);
if (!p)
return;
p->name = "Video ROM";
p->start = mem_res->start + 0xc0000UL;
p->end = p->start + 0x7fffUL;
p->flags = IORESOURCE_BUSY;
request_resource(mem_res, p);
}
static void pci_register_iommu_region(struct pci_pbm_info *pbm)
{
const u32 *vdma = of_get_property(pbm->prom_node, "virtual-dma", NULL);
if (vdma) {
struct resource *rp = kmalloc(sizeof(*rp), GFP_KERNEL);
if (!rp) {
prom_printf("Cannot allocate IOMMU resource.\n");
prom_halt();
}
rp->name = "IOMMU";
rp->start = pbm->mem_space.start + (unsigned long) vdma[0];
rp->end = rp->start + (unsigned long) vdma[1] - 1UL;
rp->flags = IORESOURCE_BUSY;
request_resource(&pbm->mem_space, rp);
}
}
void pci_determine_mem_io_space(struct pci_pbm_info *pbm)
{
const struct linux_prom_pci_ranges *pbm_ranges;
int i, saw_mem, saw_io;
int num_pbm_ranges;
saw_mem = saw_io = 0;
pbm_ranges = of_get_property(pbm->prom_node, "ranges", &i);
num_pbm_ranges = i / sizeof(*pbm_ranges);
for (i = 0; i < num_pbm_ranges; i++) {
const struct linux_prom_pci_ranges *pr = &pbm_ranges[i];
unsigned long a;
u32 parent_phys_hi, parent_phys_lo;
int type;
parent_phys_hi = pr->parent_phys_hi;
parent_phys_lo = pr->parent_phys_lo;
if (tlb_type == hypervisor)
parent_phys_hi &= 0x0fffffff;
type = (pr->child_phys_hi >> 24) & 0x3;
a = (((unsigned long)parent_phys_hi << 32UL) |
((unsigned long)parent_phys_lo << 0UL));
switch (type) {
case 0:
/* PCI config space, 16MB */
pbm->config_space = a;
break;
case 1:
/* 16-bit IO space, 16MB */
pbm->io_space.start = a;
pbm->io_space.end = a + ((16UL*1024UL*1024UL) - 1UL);
pbm->io_space.flags = IORESOURCE_IO;
saw_io = 1;
break;
case 2:
/* 32-bit MEM space, 2GB */
pbm->mem_space.start = a;
pbm->mem_space.end = a + (0x80000000UL - 1UL);
pbm->mem_space.flags = IORESOURCE_MEM;
saw_mem = 1;
break;
case 3:
/* XXX 64-bit MEM handling XXX */
default:
break;
};
}
if (!saw_io || !saw_mem) {
prom_printf("%s: Fatal error, missing %s PBM range.\n",
pbm->name,
(!saw_io ? "IO" : "MEM"));
prom_halt();
}
printk("%s: PCI IO[%lx] MEM[%lx]\n",
pbm->name,
pbm->io_space.start,
pbm->mem_space.start);
pbm->io_space.name = pbm->mem_space.name = pbm->name;
request_resource(&ioport_resource, &pbm->io_space);
request_resource(&iomem_resource, &pbm->mem_space);
pci_register_legacy_regions(&pbm->io_space,
&pbm->mem_space);
pci_register_iommu_region(pbm);
}
/* Generic helper routines for PCI error reporting. */
void pci_scan_for_target_abort(struct pci_pbm_info *pbm,
struct pci_bus *pbus)
{
struct pci_dev *pdev;
struct pci_bus *bus;
list_for_each_entry(pdev, &pbus->devices, bus_list) {
u16 status, error_bits;
pci_read_config_word(pdev, PCI_STATUS, &status);
error_bits =
(status & (PCI_STATUS_SIG_TARGET_ABORT |
PCI_STATUS_REC_TARGET_ABORT));
if (error_bits) {
pci_write_config_word(pdev, PCI_STATUS, error_bits);
printk("%s: Device %s saw Target Abort [%016x]\n",
pbm->name, pci_name(pdev), status);
}
}
list_for_each_entry(bus, &pbus->children, node)
pci_scan_for_target_abort(pbm, bus);
}
void pci_scan_for_master_abort(struct pci_pbm_info *pbm,
struct pci_bus *pbus)
{
struct pci_dev *pdev;
struct pci_bus *bus;
list_for_each_entry(pdev, &pbus->devices, bus_list) {
u16 status, error_bits;
pci_read_config_word(pdev, PCI_STATUS, &status);
error_bits =
(status & (PCI_STATUS_REC_MASTER_ABORT));
if (error_bits) {
pci_write_config_word(pdev, PCI_STATUS, error_bits);
printk("%s: Device %s received Master Abort [%016x]\n",
pbm->name, pci_name(pdev), status);
}
}
list_for_each_entry(bus, &pbus->children, node)
pci_scan_for_master_abort(pbm, bus);
}
void pci_scan_for_parity_error(struct pci_pbm_info *pbm,
struct pci_bus *pbus)
{
struct pci_dev *pdev;
struct pci_bus *bus;
list_for_each_entry(pdev, &pbus->devices, bus_list) {
u16 status, error_bits;
pci_read_config_word(pdev, PCI_STATUS, &status);
error_bits =
(status & (PCI_STATUS_PARITY |
PCI_STATUS_DETECTED_PARITY));
if (error_bits) {
pci_write_config_word(pdev, PCI_STATUS, error_bits);
printk("%s: Device %s saw Parity Error [%016x]\n",
pbm->name, pci_name(pdev), status);
}
}
list_for_each_entry(bus, &pbus->children, node)
pci_scan_for_parity_error(pbm, bus);
}
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