diff options
author | David Howells <dhowells@redhat.com> | 2009-04-21 12:24:51 -0700 |
---|---|---|
committer | Linus Torvalds <torvalds@linux-foundation.org> | 2009-04-21 13:41:50 -0700 |
commit | 77e38a554aae2c3cdbf852117bc09bac6f95dae1 (patch) | |
tree | 813625300e07dd77623ed28dc2df43488ee59dbc /arch/frv/mb93090-mb00/pci-vdk.c | |
parent | 6d029b645175ae71fdeedea84b246ecb1362d003 (diff) |
frv: insert PCI root bus resources for the MB93090 devel motherboard
Insert PCI root bus resources for the FRV-based MB93090 development kit
motherboard. This is required because the CPU's window onto the PCI bus
address space is considerably smaller than the CPU's full address space
and non-PCI devices lie outside of the PCI window that we might want to
access.
Without this patch, the PCI root bus uses the platform-level bus
resources, and these are then confined to the PCI window, thus making
platform_device_add() reject devices outside of this window.
Signed-off-by: David Howells <dhowells@redhat.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'arch/frv/mb93090-mb00/pci-vdk.c')
-rw-r--r-- | arch/frv/mb93090-mb00/pci-vdk.c | 63 |
1 files changed, 50 insertions, 13 deletions
diff --git a/arch/frv/mb93090-mb00/pci-vdk.c b/arch/frv/mb93090-mb00/pci-vdk.c index 0f41c3a72da5..c0dcec65c6b7 100644 --- a/arch/frv/mb93090-mb00/pci-vdk.c +++ b/arch/frv/mb93090-mb00/pci-vdk.c @@ -31,6 +31,29 @@ struct pci_bus *__nongpreldata pci_root_bus; struct pci_ops *__nongpreldata pci_root_ops; /* + * The accessible PCI window does not cover the entire CPU address space, but + * there are devices we want to access outside of that window, so we need to + * insert specific PCI bus resources instead of using the platform-level bus + * resources directly for the PCI root bus. + * + * These are configured and inserted by pcibios_init() and are attached to the + * root bus by pcibios_fixup_bus(). + */ +static struct resource pci_ioport_resource = { + .name = "PCI IO", + .start = 0, + .end = IO_SPACE_LIMIT, + .flags = IORESOURCE_IO, +}; + +static struct resource pci_iomem_resource = { + .name = "PCI mem", + .start = 0, + .end = -1, + .flags = IORESOURCE_MEM, +}; + +/* * Functions for accessing PCI configuration space */ @@ -304,6 +327,12 @@ void __init pcibios_fixup_bus(struct pci_bus *bus) #if 0 printk("### PCIBIOS_FIXUP_BUS(%d)\n",bus->number); #endif + + if (bus->number == 0) { + bus->resource[0] = &pci_ioport_resource; + bus->resource[1] = &pci_iomem_resource; + } + pci_read_bridge_bases(bus); if (bus->number == 0) { @@ -350,28 +379,36 @@ int __init pcibios_init(void) /* enable PCI arbitration */ __reg_MB86943_pci_arbiter = MB86943_PCIARB_EN; - ioport_resource.start = (__reg_MB86943_sl_pci_io_base << 9) & 0xfffffc00; - ioport_resource.end = (__reg_MB86943_sl_pci_io_range << 9) | 0x3ff; - ioport_resource.end += ioport_resource.start; + pci_ioport_resource.start = (__reg_MB86943_sl_pci_io_base << 9) & 0xfffffc00; + pci_ioport_resource.end = (__reg_MB86943_sl_pci_io_range << 9) | 0x3ff; + pci_ioport_resource.end += pci_ioport_resource.start; printk("PCI IO window: %08llx-%08llx\n", - (unsigned long long) ioport_resource.start, - (unsigned long long) ioport_resource.end); + (unsigned long long) pci_ioport_resource.start, + (unsigned long long) pci_ioport_resource.end); - iomem_resource.start = (__reg_MB86943_sl_pci_mem_base << 9) & 0xfffffc00; + pci_iomem_resource.start = (__reg_MB86943_sl_pci_mem_base << 9) & 0xfffffc00; + pci_iomem_resource.end = (__reg_MB86943_sl_pci_mem_range << 9) | 0x3ff; + pci_iomem_resource.end += pci_iomem_resource.start; - /* Reserve somewhere to write to flush posted writes. */ - iomem_resource.start += 0x400; - - iomem_resource.end = (__reg_MB86943_sl_pci_mem_range << 9) | 0x3ff; - iomem_resource.end += iomem_resource.start; + /* Reserve somewhere to write to flush posted writes. This is used by + * __flush_PCI_writes() from asm/io.h to force the write FIFO in the + * CPU-PCI bridge to flush as this doesn't happen automatically when a + * read is performed on the MB93090 development kit motherboard. + */ + pci_iomem_resource.start += 0x400; printk("PCI MEM window: %08llx-%08llx\n", - (unsigned long long) iomem_resource.start, - (unsigned long long) iomem_resource.end); + (unsigned long long) pci_iomem_resource.start, + (unsigned long long) pci_iomem_resource.end); printk("PCI DMA memory: %08lx-%08lx\n", dma_coherent_mem_start, dma_coherent_mem_end); + if (insert_resource(&iomem_resource, &pci_iomem_resource) < 0) + panic("Unable to insert PCI IOMEM resource\n"); + if (insert_resource(&ioport_resource, &pci_ioport_resource) < 0) + panic("Unable to insert PCI IOPORT resource\n"); + if (!pci_probe) return -ENXIO; |