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authorNathan Hintz <nlhintz@hotmail.com>2013-01-12 02:46:15 -0800
committerJohn W. Linville <linville@tuxdriver.com>2013-01-14 15:10:41 -0500
commit447d7e25be462329268f279bef2f6faa986a5185 (patch)
tree4692b6b4cda88685486d2a7054220edf0fc39262 /drivers/bcma
parenta35ab937cb27ec8c00b6f13cade93dc10e22b670 (diff)
downloadvexpress-lsk-447d7e25be462329268f279bef2f6faa986a5185.tar.gz
bcma: don't map/unmap a subset of the PCI config space
For PCI config space access offsets < 256 for device '0', bcma_extpci_write_config performs an 'ioremap_nocache' on a 4 byte section of the PCI config space (an area that has already previously been mapped), and then subsequently unmaps that 4 byte section. This can't be a good thing for future read access from that now unmapped location. Modify the config space writes to use the existing access functions (similar to how it is done for the reads). Signed-off-by: Nathan Hintz <nlhintz@hotmail.com> Acked-by: Hauke Mehrtens <hauke@hauke-m.de> Signed-off-by: John W. Linville <linville@tuxdriver.com>
Diffstat (limited to 'drivers/bcma')
-rw-r--r--drivers/bcma/driver_pci_host.c22
1 files changed, 11 insertions, 11 deletions
diff --git a/drivers/bcma/driver_pci_host.c b/drivers/bcma/driver_pci_host.c
index 4a415238951..c0cb0620ab6 100644
--- a/drivers/bcma/driver_pci_host.c
+++ b/drivers/bcma/driver_pci_host.c
@@ -149,7 +149,7 @@ static int bcma_extpci_write_config(struct bcma_drv_pci *pc, unsigned int dev,
const void *buf, int len)
{
int err = -EINVAL;
- u32 addr = 0, val = 0;
+ u32 addr, val;
void __iomem *mmio = 0;
u16 chipid = pc->core->bus->chipinfo.id;
@@ -165,12 +165,10 @@ static int bcma_extpci_write_config(struct bcma_drv_pci *pc, unsigned int dev,
* requires indirect access.
*/
if (off < PCI_CONFIG_SPACE_SIZE) {
- addr = pc->core->addr + BCMA_CORE_PCI_PCICFG0;
+ addr = BCMA_CORE_PCI_PCICFG0;
addr |= (func << 8);
addr |= (off & 0xfc);
- mmio = ioremap_nocache(addr, sizeof(val));
- if (!mmio)
- goto out;
+ val = pcicore_read32(pc, addr);
}
} else {
addr = bcma_get_cfgspace_addr(pc, dev, func, off);
@@ -189,12 +187,10 @@ static int bcma_extpci_write_config(struct bcma_drv_pci *pc, unsigned int dev,
switch (len) {
case 1:
- val = readl(mmio);
val &= ~(0xFF << (8 * (off & 3)));
val |= *((const u8 *)buf) << (8 * (off & 3));
break;
case 2:
- val = readl(mmio);
val &= ~(0xFFFF << (8 * (off & 3)));
val |= *((const u16 *)buf) << (8 * (off & 3));
break;
@@ -202,13 +198,17 @@ static int bcma_extpci_write_config(struct bcma_drv_pci *pc, unsigned int dev,
val = *((const u32 *)buf);
break;
}
- if (dev == 0 && !addr) {
+ if (dev == 0) {
/* accesses to config registers with offsets >= 256
* requires indirect access.
*/
- addr = (func << 12);
- addr |= (off & 0x0FFF);
- bcma_pcie_write_config(pc, addr, val);
+ if (off >= PCI_CONFIG_SPACE_SIZE) {
+ addr = (func << 12);
+ addr |= (off & 0x0FFF);
+ bcma_pcie_write_config(pc, addr, val);
+ } else {
+ pcicore_write32(pc, addr, val);
+ }
} else {
writel(val, mmio);