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authorGabor Juhos <juhosg@openwrt.org>2012-03-14 10:36:04 +0100
committerRalf Baechle <ralf@linux-mips.org>2012-05-15 17:49:03 +0200
commit64adb6bb62bee11ad04c2f9c3c797799e329c351 (patch)
treebc366ea60a40310184cbdb1bfb20e648ee639abe /arch/mips
parentffdce4668234a113e767edd27aa1331903959106 (diff)
MIPS: ath79: fix broken ar724x_pci_{read,write} functions
The current ar724x_pci_{read,write} functions are broken. Due to that, pci_read_config_byte returns with bogus values, and pci_write_config_{byte,word} unconditionally clears the accessed PCI configuration registers instead of changing the value of them. The patch fixes the broken functions, thus the PCI configuration space can be accessed correctly. Signed-off-by: Gabor Juhos <juhosg@openwrt.org> Cc: linux-mips@linux-mips.org Patchwork: https://patchwork.linux-mips.org/patch/3493/ Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
Diffstat (limited to 'arch/mips')
-rw-r--r--arch/mips/pci/pci-ar724x.c52
1 files changed, 26 insertions, 26 deletions
diff --git a/arch/mips/pci/pci-ar724x.c b/arch/mips/pci/pci-ar724x.c
index 342bf4ab8960..bb4f2162d4e4 100644
--- a/arch/mips/pci/pci-ar724x.c
+++ b/arch/mips/pci/pci-ar724x.c
@@ -22,8 +22,9 @@ static void __iomem *ar724x_pci_devcfg_base;
static int ar724x_pci_read(struct pci_bus *bus, unsigned int devfn, int where,
int size, uint32_t *value)
{
- unsigned long flags, addr, tval, mask;
+ unsigned long flags;
void __iomem *base;
+ u32 data;
if (devfn)
return PCIBIOS_DEVICE_NOT_FOUND;
@@ -31,24 +32,22 @@ static int ar724x_pci_read(struct pci_bus *bus, unsigned int devfn, int where,
base = ar724x_pci_devcfg_base;
spin_lock_irqsave(&ar724x_pci_lock, flags);
+ data = __raw_readl(base + (where & ~3));
switch (size) {
case 1:
- addr = where & ~3;
- mask = 0xff000000 >> ((where % 4) * 8);
- tval = __raw_readl(base + addr);
- tval = tval & ~mask;
- *value = (tval >> ((4 - (where % 4))*8));
+ if (where & 1)
+ data >>= 8;
+ if (where & 2)
+ data >>= 16;
+ data &= 0xff;
break;
case 2:
- addr = where & ~3;
- mask = 0xffff0000 >> ((where % 4)*8);
- tval = __raw_readl(base + addr);
- tval = tval & ~mask;
- *value = (tval >> ((4 - (where % 4))*8));
+ if (where & 2)
+ data >>= 16;
+ data &= 0xffff;
break;
case 4:
- *value = __raw_readl(base + where);
break;
default:
spin_unlock_irqrestore(&ar724x_pci_lock, flags);
@@ -57,6 +56,7 @@ static int ar724x_pci_read(struct pci_bus *bus, unsigned int devfn, int where,
}
spin_unlock_irqrestore(&ar724x_pci_lock, flags);
+ *value = data;
return PCIBIOS_SUCCESSFUL;
}
@@ -64,8 +64,10 @@ static int ar724x_pci_read(struct pci_bus *bus, unsigned int devfn, int where,
static int ar724x_pci_write(struct pci_bus *bus, unsigned int devfn, int where,
int size, uint32_t value)
{
- unsigned long flags, tval, addr, mask;
+ unsigned long flags;
void __iomem *base;
+ u32 data;
+ int s;
if (devfn)
return PCIBIOS_DEVICE_NOT_FOUND;
@@ -73,26 +75,21 @@ static int ar724x_pci_write(struct pci_bus *bus, unsigned int devfn, int where,
base = ar724x_pci_devcfg_base;
spin_lock_irqsave(&ar724x_pci_lock, flags);
+ data = __raw_readl(base + (where & ~3));
switch (size) {
case 1:
- addr = where & ~3;
- mask = 0xff000000 >> ((where % 4)*8);
- tval = __raw_readl(base + addr);
- tval = tval & ~mask;
- tval |= (value << ((4 - (where % 4))*8)) & mask;
- __raw_writel(tval, base + addr);
+ s = ((where & 3) * 8);
+ data &= ~(0xff << s);
+ data |= ((value & 0xff) << s);
break;
case 2:
- addr = where & ~3;
- mask = 0xffff0000 >> ((where % 4)*8);
- tval = __raw_readl(base + addr);
- tval = tval & ~mask;
- tval |= (value << ((4 - (where % 4))*8)) & mask;
- __raw_writel(tval, base + addr);
+ s = ((where & 2) * 8);
+ data &= ~(0xffff << s);
+ data |= ((value & 0xffff) << s);
break;
case 4:
- __raw_writel(value, (base + where));
+ data = value;
break;
default:
spin_unlock_irqrestore(&ar724x_pci_lock, flags);
@@ -100,6 +97,9 @@ static int ar724x_pci_write(struct pci_bus *bus, unsigned int devfn, int where,
return PCIBIOS_BAD_REGISTER_NUMBER;
}
+ __raw_writel(data, base + (where & ~3));
+ /* flush write */
+ __raw_readl(base + (where & ~3));
spin_unlock_irqrestore(&ar724x_pci_lock, flags);
return PCIBIOS_SUCCESSFUL;