diff options
| author | Yu Zhao <yu.zhao@intel.com> | 2008-11-22 02:41:27 +0800 |
|---|---|---|
| committer | Jesse Barnes <jbarnes@virtuousgeek.org> | 2009-01-07 11:13:04 -0800 |
| commit | 613e7ed6f72b1a115f7ece8ce1b66cf095de1348 (patch) | |
| tree | 2af16f01cbf78f1de6b858788091a72fa57af6c8 | |
| parent | 3789fa8a2e534523c896a32a9f27f78d52ad7d82 (diff) | |
PCI: add a new function to map BAR offsets
Add a function to map a given resource number to a corresponding
register so drivers can get the offset and type of device specific BARs.
Signed-off-by: Yu Zhao <yu.zhao@intel.com>
Signed-off-by: Jesse Barnes <jbarnes@virtuousgeek.org>
| -rw-r--r-- | drivers/pci/pci.c | 22 | ||||
| -rw-r--r-- | drivers/pci/pci.h | 2 | ||||
| -rw-r--r-- | drivers/pci/setup-res.c | 13 |
3 files changed, 29 insertions, 8 deletions
diff --git a/drivers/pci/pci.c b/drivers/pci/pci.c index deeab19d7d1..7e9c0f3936d 100644 --- a/drivers/pci/pci.c +++ b/drivers/pci/pci.c @@ -2201,6 +2201,28 @@ int pci_select_bars(struct pci_dev *dev, unsigned long flags) return bars; } +/** + * pci_resource_bar - get position of the BAR associated with a resource + * @dev: the PCI device + * @resno: the resource number + * @type: the BAR type to be filled in + * + * Returns BAR position in config space, or 0 if the BAR is invalid. + */ +int pci_resource_bar(struct pci_dev *dev, int resno, enum pci_bar_type *type) +{ + if (resno < PCI_ROM_RESOURCE) { + *type = pci_bar_unknown; + return PCI_BASE_ADDRESS_0 + 4 * resno; + } else if (resno == PCI_ROM_RESOURCE) { + *type = pci_bar_mem32; + return dev->rom_base_reg; + } + + dev_err(&dev->dev, "BAR: invalid resource #%d\n", resno); + return 0; +} + static void __devinit pci_no_domains(void) { #ifdef CONFIG_PCI_DOMAINS diff --git a/drivers/pci/pci.h b/drivers/pci/pci.h index d881fde8bb8..c4f4a1e6ea2 100644 --- a/drivers/pci/pci.h +++ b/drivers/pci/pci.h @@ -171,6 +171,8 @@ enum pci_bar_type { extern int __pci_read_base(struct pci_dev *dev, enum pci_bar_type type, struct resource *res, unsigned int reg); +extern int pci_resource_bar(struct pci_dev *dev, int resno, + enum pci_bar_type *type); extern void pci_enable_ari(struct pci_dev *dev); /** * pci_ari_enabled - query ARI forwarding status diff --git a/drivers/pci/setup-res.c b/drivers/pci/setup-res.c index 3c5203ff53c..32e8d88a461 100644 --- a/drivers/pci/setup-res.c +++ b/drivers/pci/setup-res.c @@ -31,6 +31,7 @@ void pci_update_resource(struct pci_dev *dev, int resno) struct pci_bus_region region; u32 new, check, mask; int reg; + enum pci_bar_type type; struct resource *res = dev->resource + resno; /* @@ -62,17 +63,13 @@ void pci_update_resource(struct pci_dev *dev, int resno) else mask = (u32)PCI_BASE_ADDRESS_MEM_MASK; - if (resno < 6) { - reg = PCI_BASE_ADDRESS_0 + 4 * resno; - } else if (resno == PCI_ROM_RESOURCE) { + reg = pci_resource_bar(dev, resno, &type); + if (!reg) + return; + if (type != pci_bar_unknown) { if (!(res->flags & IORESOURCE_ROM_ENABLE)) return; new |= PCI_ROM_ADDRESS_ENABLE; - reg = dev->rom_base_reg; - } else { - /* Hmm, non-standard resource. */ - - return; /* kill uninitialised var warning */ } pci_write_config_dword(dev, reg, new); |