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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>
This commit is contained in:
Gabor Juhos 2012-03-14 10:36:04 +01:00 committed by Ralf Baechle
parent ffdce46682
commit 64adb6bb62
1 changed files with 26 additions and 26 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

52
arch/mips/pci/pci-ar724x.c
View File

@ -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, static int ar724x_pci_read(struct pci_bus *bus, unsigned int devfn, int where,
int size, uint32_t *value) int size, uint32_t *value)
{ {
unsigned long flags, addr, tval, mask; unsigned long flags;
void __iomem *base; void __iomem *base;
u32 data;
if (devfn) if (devfn)
return PCIBIOS_DEVICE_NOT_FOUND; 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; base = ar724x_pci_devcfg_base;
spin_lock_irqsave(&ar724x_pci_lock, flags); spin_lock_irqsave(&ar724x_pci_lock, flags);
data = __raw_readl(base + (where & ~3));
switch (size) { switch (size) {
case 1: case 1:
addr = where & ~3; if (where & 1)
mask = 0xff000000 >> ((where % 4) * 8); data >>= 8;
tval = __raw_readl(base + addr); if (where & 2)
tval = tval & ~mask; data >>= 16;
*value = (tval >> ((4 - (where % 4))*8)); data &= 0xff;
break; break;
case 2: case 2:
addr = where & ~3; if (where & 2)
mask = 0xffff0000 >> ((where % 4)*8); data >>= 16;
tval = __raw_readl(base + addr); data &= 0xffff;
tval = tval & ~mask;
*value = (tval >> ((4 - (where % 4))*8));
break; break;
case 4: case 4:
*value = __raw_readl(base + where);
break; break;
default: default:
spin_unlock_irqrestore(&ar724x_pci_lock, flags); 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); spin_unlock_irqrestore(&ar724x_pci_lock, flags);
*value = data;
return PCIBIOS_SUCCESSFUL; 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, static int ar724x_pci_write(struct pci_bus *bus, unsigned int devfn, int where,
int size, uint32_t value) int size, uint32_t value)
{ {
unsigned long flags, tval, addr, mask; unsigned long flags;
void __iomem *base; void __iomem *base;
u32 data;
int s;
if (devfn) if (devfn)
return PCIBIOS_DEVICE_NOT_FOUND; 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; base = ar724x_pci_devcfg_base;
spin_lock_irqsave(&ar724x_pci_lock, flags); spin_lock_irqsave(&ar724x_pci_lock, flags);
data = __raw_readl(base + (where & ~3));
switch (size) { switch (size) {
case 1: case 1:
addr = where & ~3; s = ((where & 3) * 8);
mask = 0xff000000 >> ((where % 4)*8); data &= ~(0xff << s);
tval = __raw_readl(base + addr); data |= ((value & 0xff) << s);
tval = tval & ~mask;
tval |= (value << ((4 - (where % 4))*8)) & mask;
__raw_writel(tval, base + addr);
break; break;
case 2: case 2:
addr = where & ~3; s = ((where & 2) * 8);
mask = 0xffff0000 >> ((where % 4)*8); data &= ~(0xffff << s);
tval = __raw_readl(base + addr); data |= ((value & 0xffff) << s);
tval = tval & ~mask;
tval |= (value << ((4 - (where % 4))*8)) & mask;
__raw_writel(tval, base + addr);
break; break;
case 4: case 4:
__raw_writel(value, (base + where)); data = value;
break; break;
default: default:
spin_unlock_irqrestore(&ar724x_pci_lock, flags); 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; 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); spin_unlock_irqrestore(&ar724x_pci_lock, flags);
return PCIBIOS_SUCCESSFUL; return PCIBIOS_SUCCESSFUL;