hollalinux
/
linux-sg2042
mirror of https://github.com/sophgo/linux-riscv.git
1
0
Fork 0
Code Issues Packages Projects Releases Wiki Activity

ssb: Fix support for PCI devices behind a SSB->PCI bridge 

We must pin all resources and make sure the PCI subsystem
won't relocate us, as the addresses are hardwired into hardware.

Signed-off-by: Michael Buesch <mb@bu3sch.de>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
This commit is contained in:
Michael Buesch 2008-02-16 18:13:36 +01:00 committed by John W. Linville
parent 5078ed5071
commit fc71acc846
1 changed files with 12 additions and 5 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

17
drivers/ssb/driver_pcicore.c
View File

@ -79,6 +79,7 @@ int pcibios_plat_dev_init(struct pci_dev *d)
base = &ssb_pcicore_pcibus_iobase; base = &ssb_pcicore_pcibus_iobase;
else else
base = &ssb_pcicore_pcibus_membase; base = &ssb_pcicore_pcibus_membase;
res->flags |= IORESOURCE_PCI_FIXED;
if (res->end) { if (res->end) {
size = res->end - res->start + 1; size = res->end - res->start + 1;
if (*base & (size - 1)) if (*base & (size - 1))
@ -101,10 +102,12 @@ int pcibios_plat_dev_init(struct pci_dev *d)
static void __init ssb_fixup_pcibridge(struct pci_dev *dev) static void __init ssb_fixup_pcibridge(struct pci_dev *dev)
{ {
u8 lat;
if (dev->bus->number != 0 || PCI_SLOT(dev->devfn) != 0) if (dev->bus->number != 0 || PCI_SLOT(dev->devfn) != 0)
return; return;
ssb_printk(KERN_INFO "PCI: fixing up bridge\n"); ssb_printk(KERN_INFO "PCI: Fixing up bridge %s\n", pci_name(dev));
/* Enable PCI bridge bus mastering and memory space */ /* Enable PCI bridge bus mastering and memory space */
pci_set_master(dev); pci_set_master(dev);
@ -114,7 +117,10 @@ static void __init ssb_fixup_pcibridge(struct pci_dev *dev)
pci_write_config_dword(dev, SSB_BAR1_CONTROL, 3); pci_write_config_dword(dev, SSB_BAR1_CONTROL, 3);
/* Make sure our latency is high enough to handle the devices behind us */ /* Make sure our latency is high enough to handle the devices behind us */
pci_write_config_byte(dev, PCI_LATENCY_TIMER, 0xa8); lat = 168;
ssb_printk(KERN_INFO "PCI: Fixing latency timer of device %s to %u\n",
pci_name(dev), lat);
pci_write_config_byte(dev, PCI_LATENCY_TIMER, lat);
} }
DECLARE_PCI_FIXUP_EARLY(PCI_ANY_ID, PCI_ANY_ID, ssb_fixup_pcibridge); DECLARE_PCI_FIXUP_EARLY(PCI_ANY_ID, PCI_ANY_ID, ssb_fixup_pcibridge);
@ -294,14 +300,14 @@ static struct resource ssb_pcicore_mem_resource = {
.name = "SSB PCIcore external memory", .name = "SSB PCIcore external memory",
.start = SSB_PCI_DMA, .start = SSB_PCI_DMA,
.end = SSB_PCI_DMA + SSB_PCI_DMA_SZ - 1, .end = SSB_PCI_DMA + SSB_PCI_DMA_SZ - 1,
.flags = IORESOURCE_MEM, .flags = IORESOURCE_MEM | IORESOURCE_PCI_FIXED,
}; };
static struct resource ssb_pcicore_io_resource = { static struct resource ssb_pcicore_io_resource = {
.name = "SSB PCIcore external I/O", .name = "SSB PCIcore external I/O",
.start = 0x100, .start = 0x100,
.end = 0x7FF, .end = 0x7FF,
.flags = IORESOURCE_IO, .flags = IORESOURCE_IO | IORESOURCE_PCI_FIXED,
}; };
static struct pci_controller ssb_pcicore_controller = { static struct pci_controller ssb_pcicore_controller = {
@ -368,7 +374,8 @@ static void ssb_pcicore_init_hostmode(struct ssb_pcicore *pc)
/* Ok, ready to run, register it to the system. /* Ok, ready to run, register it to the system.
* The following needs change, if we want to port hostmode * The following needs change, if we want to port hostmode
* to non-MIPS platform. */ * to non-MIPS platform. */
set_io_port_base((unsigned long)ioremap_nocache(SSB_PCI_MEM, 0x04000000)); ssb_pcicore_controller.io_map_base = (unsigned long)ioremap_nocache(SSB_PCI_MEM, 0x04000000);
set_io_port_base(ssb_pcicore_controller.io_map_base);
/* Give some time to the PCI controller to configure itself with the new /* Give some time to the PCI controller to configure itself with the new
* values. Not waiting at this point causes crashes of the machine. */ * values. Not waiting at this point causes crashes of the machine. */
mdelay(10); mdelay(10);