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authorMark Maule <maule@sgi.com>2005-04-25 11:26:03 -0700
committerTony Luck <tony.luck@intel.com>2005-04-25 11:26:03 -0700
commite955d82543fea76b02aa243b182e782f71bda82c (patch)
tree58dc9df5161f47bca69c8dc9c819495f15694352 /arch/ia64/sn/kernel
parent25ee7e3832951cf5896b194f6cd929a44863f419 (diff)
[IA64-SGI] sn2-pci-dma-abstraction.patch
Provide an abstraction of the altix pci dma runtime layer so that multiple pci-based bridges can be supported. Signed-off-by: Mark Maule <maule@sgi.com> Signed-off-by: Tony Luck <tony.luck@intel.com>
Diffstat (limited to 'arch/ia64/sn/kernel')
-rw-r--r--arch/ia64/sn/kernel/io_init.c72
1 files changed, 64 insertions, 8 deletions
diff --git a/arch/ia64/sn/kernel/io_init.c b/arch/ia64/sn/kernel/io_init.c
index 001880812b7..3e5e4a90130 100644
--- a/arch/ia64/sn/kernel/io_init.c
+++ b/arch/ia64/sn/kernel/io_init.c
@@ -34,6 +34,37 @@ struct brick {
int sn_ioif_inited = 0; /* SN I/O infrastructure initialized? */
+struct sn_pcibus_provider *sn_pci_provider[PCIIO_ASIC_MAX_TYPES]; /* indexed by asic type */
+
+/*
+ * Hooks and struct for unsupported pci providers
+ */
+
+static dma_addr_t
+sn_default_pci_map(struct pci_dev *pdev, unsigned long paddr, size_t size)
+{
+ return 0;
+}
+
+static void
+sn_default_pci_unmap(struct pci_dev *pdev, dma_addr_t addr, int direction)
+{
+ return;
+}
+
+static void *
+sn_default_pci_bus_fixup(struct pcibus_bussoft *soft)
+{
+ return NULL;
+}
+
+static struct sn_pcibus_provider sn_pci_default_provider = {
+ .dma_map = sn_default_pci_map,
+ .dma_map_consistent = sn_default_pci_map,
+ .dma_unmap = sn_default_pci_unmap,
+ .bus_fixup = sn_default_pci_bus_fixup,
+};
+
/*
* Retrieve the DMA Flush List given nasid. This list is needed
* to implement the WAR - Flush DMA data on PIO Reads.
@@ -201,6 +232,7 @@ static void sn_pci_fixup_slot(struct pci_dev *dev)
struct sn_irq_info *sn_irq_info;
struct pci_dev *host_pci_dev;
int status = 0;
+ struct pcibus_bussoft *bs;
dev->sysdata = kmalloc(sizeof(struct pcidev_info), GFP_KERNEL);
if (SN_PCIDEV_INFO(dev) <= 0)
@@ -241,6 +273,7 @@ static void sn_pci_fixup_slot(struct pci_dev *dev)
}
/* set up host bus linkages */
+ bs = SN_PCIBUS_BUSSOFT(dev->bus);
host_pci_dev =
pci_find_slot(SN_PCIDEV_INFO(dev)->pdi_slot_host_handle >> 32,
SN_PCIDEV_INFO(dev)->
@@ -248,10 +281,16 @@ static void sn_pci_fixup_slot(struct pci_dev *dev)
SN_PCIDEV_INFO(dev)->pdi_host_pcidev_info =
SN_PCIDEV_INFO(host_pci_dev);
SN_PCIDEV_INFO(dev)->pdi_linux_pcidev = dev;
- SN_PCIDEV_INFO(dev)->pdi_pcibus_info = SN_PCIBUS_BUSSOFT(dev->bus);
+ SN_PCIDEV_INFO(dev)->pdi_pcibus_info = bs;
+
+ if (bs && bs->bs_asic_type < PCIIO_ASIC_MAX_TYPES) {
+ SN_PCIDEV_BUSPROVIDER(dev) = sn_pci_provider[bs->bs_asic_type];
+ } else {
+ SN_PCIDEV_BUSPROVIDER(dev) = &sn_pci_default_provider;
+ }
/* Only set up IRQ stuff if this device has a host bus context */
- if (SN_PCIDEV_BUSSOFT(dev) && sn_irq_info->irq_irq) {
+ if (bs && sn_irq_info->irq_irq) {
SN_PCIDEV_INFO(dev)->pdi_sn_irq_info = sn_irq_info;
dev->irq = SN_PCIDEV_INFO(dev)->pdi_sn_irq_info->irq_irq;
sn_irq_fixup(dev, sn_irq_info);
@@ -271,6 +310,7 @@ static void sn_pci_controller_fixup(int segment, int busnum)
struct pcibus_bussoft *prom_bussoft_ptr;
struct hubdev_info *hubdev_info;
void *provider_soft;
+ struct sn_pcibus_provider *provider;
status =
sal_get_pcibus_info((u64) segment, (u64) busnum,
@@ -291,16 +331,22 @@ static void sn_pci_controller_fixup(int segment, int busnum)
/*
* Per-provider fixup. Copies the contents from prom to local
* area and links SN_PCIBUS_BUSSOFT().
- *
- * Note: Provider is responsible for ensuring that prom_bussoft_ptr
- * represents an asic-type that it can handle.
*/
- if (prom_bussoft_ptr->bs_asic_type == PCIIO_ASIC_TYPE_PPB) {
- return; /* no further fixup necessary */
+ if (prom_bussoft_ptr->bs_asic_type >= PCIIO_ASIC_MAX_TYPES) {
+ return; /* unsupported asic type */
+ }
+
+ provider = sn_pci_provider[prom_bussoft_ptr->bs_asic_type];
+ if (provider == NULL) {
+ return; /* no provider registerd for this asic */
+ }
+
+ provider_soft = NULL;
+ if (provider->bus_fixup) {
+ provider_soft = (*provider->bus_fixup) (prom_bussoft_ptr);
}
- provider_soft = pcibr_bus_fixup(prom_bussoft_ptr);
if (provider_soft == NULL) {
return; /* fixup failed or not applicable */
}
@@ -339,6 +385,16 @@ static int __init sn_pci_init(void)
return 0;
/*
+ * prime sn_pci_provider[]. Individial provider init routines will
+ * override their respective default entries.
+ */
+
+ for (i = 0; i < PCIIO_ASIC_MAX_TYPES; i++)
+ sn_pci_provider[i] = &sn_pci_default_provider;
+
+ pcibr_init_provider();
+
+ /*
* This is needed to avoid bounce limit checks in the blk layer
*/
ia64_max_iommu_merge_mask = ~PAGE_MASK;