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@xxxxxxxxxxx>
---
Output of 'lspci -vv' without the patch:
00:00.0 Network controller: Atheros Communications Inc. AR9285 Wireless
Network Adapter (PCI-Express) (rev 01)
Subsystem: Atheros Communications Inc. Device a091
Control: I/O- Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR- FastB2B- DisINTx-
Status: Cap+ 66MHz- UDF- FastB2B- ParErr- DEVSEL=fast >TAbort- <TAbort- <MAbort- >SERR- <PERR- INTx-
Latency: 0
Interrupt: pin A routed to IRQ 0
Region 0: Memory at 10000000 (64-bit, non-prefetchable) [size=64K]
Capabilities: [40] Power Management version 3
Flags: PMEClk- DSI- D1+ D2- AuxCurrent=375mA PME(D0+,D1+,D2-,D3hot+,D3cold-)
Status: D0 NoSoftRst- PME-Enable- DSel=0 DScale=0 PME-
Capabilities: [50] MSI: Enable- Count=1/1 Maskable- 64bit-
Address: 00000000 Data: 0000
Capabilities: [60] Express (v2) Legacy Endpoint, MSI 00
DevCap: MaxPayload 128 bytes, PhantFunc 0, Latency L0s <512ns, L1 <64us
ExtTag- AttnBtn- AttnInd- PwrInd- RBE+ FLReset-
DevCtl: Report errors: Correctable- Non-Fatal- Fatal- Unsupported-
RlxdOrd+ ExtTag- PhantFunc- AuxPwr- NoSnoop-
MaxPayload 128 bytes, MaxReadReq 512 bytes
DevSta: CorrErr- UncorrErr- FatalErr- UnsuppReq- AuxPwr- TransPend-
LnkCap: Port #0, Speed 2.5GT/s, Width x1, ASPM unknown, Latency L0 <512ns, L1 <64us
ClockPM- Surprise- LLActRep- BwNot-
LnkCtl: ASPM Disabled; RCB 64 bytes Disabled- Retrain- CommClk-
ExtSynch- ClockPM- AutWidDis- BWInt- AutBWInt-
LnkSta: Speed 2.5GT/s, Width x1, TrErr- Train- SlotClk+ DLActive- BWMgmt- ABWMgmt-
DevCap2: Completion Timeout: Not Supported, TimeoutDis+
DevCtl2: Completion Timeout: 50us to 50ms, TimeoutDis-
LnkCtl2: Target Link Speed: 2.5GT/s, EnterCompliance- SpeedDis-, Selectable De-emphasis: -6dB
Transmit Margin: Normal Operating Range, EnterModifiedCompliance- ComplianceSOS-
Compliance De-emphasis: -6dB
LnkSta2: Current De-emphasis Level: -6dB
Output of 'lspci -vv' with the patch:
00:00.0 Network controller: Atheros Communications Inc. AR9285 Wireless
Network Adapter (PCI-Express) (rev 01)
Subsystem: Atheros Communications Inc. Device a091
Control: I/O- Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR- FastB2B- DisINTx-
Status: Cap+ 66MHz- UDF- FastB2B- ParErr- DEVSEL=fast >TAbort- <TAbort- <MAbort- >SERR- <PERR- INTx-
Latency: 0
Interrupt: pin A routed to IRQ 48
Region 0: Memory at 10000000 (64-bit, non-prefetchable) [size=64K]
Capabilities: [40] Power Management version 3
Flags: PMEClk- DSI- D1+ D2- AuxCurrent=375mA PME(D0+,D1+,D2-,D3hot+,D3cold-)
Status: D0 NoSoftRst- PME-Enable- DSel=0 DScale=0 PME-
Capabilities: [50] MSI: Enable- Count=1/1 Maskable- 64bit-
Address: 00000000 Data: 0000
Capabilities: [60] Express (v2) Legacy Endpoint, MSI 00
DevCap: MaxPayload 128 bytes, PhantFunc 0, Latency L0s <512ns, L1 <64us
ExtTag- AttnBtn- AttnInd- PwrInd- RBE+ FLReset-
DevCtl: Report errors: Correctable- Non-Fatal- Fatal- Unsupported-
RlxdOrd+ ExtTag- PhantFunc- AuxPwr- NoSnoop-
MaxPayload 128 bytes, MaxReadReq 512 bytes
DevSta: CorrErr- UncorrErr- FatalErr- UnsuppReq- AuxPwr- TransPend-
LnkCap: Port #0, Speed 2.5GT/s, Width x1, ASPM unknown, Latency L0 <512ns, L1 <64us
ClockPM- Surprise- LLActRep- BwNot-
LnkCtl: ASPM Disabled; RCB 64 bytes Disabled- Retrain- CommClk-
ExtSynch- ClockPM- AutWidDis- BWInt- AutBWInt-
LnkSta: Speed 2.5GT/s, Width x1, TrErr- Train- SlotClk+ DLActive- BWMgmt- ABWMgmt-
DevCap2: Completion Timeout: Not Supported, TimeoutDis+
DevCtl2: Completion Timeout: 50us to 50ms, TimeoutDis-
LnkCtl2: Target Link Speed: 2.5GT/s, EnterCompliance- SpeedDis-, Selectable De-emphasis: -6dB
Transmit Margin: Normal Operating Range, EnterModifiedCompliance- ComplianceSOS-
Compliance De-emphasis: -6dB
LnkSta2: Current De-emphasis Level: -6dB
Capabilities: [100 v1] Advanced Error Reporting
UESta: DLP- SDES- TLP- FCP- CmpltTO- CmpltAbrt- UnxCmplt- RxOF- MalfTLP- ECRC- UnsupReq- ACSViol-
UEMsk: DLP- SDES- TLP- FCP- CmpltTO- CmpltAbrt- UnxCmplt- RxOF- MalfTLP- ECRC- UnsupReq- ACSViol-
UESvrt: DLP+ SDES+ TLP- FCP+ CmpltTO- CmpltAbrt- UnxCmplt- RxOF+ MalfTLP+ ECRC- UnsupReq- ACSViol-
CESta: RxErr- BadTLP- BadDLLP- Rollover- Timeout- NonFatalErr-
CEMsk: RxErr- BadTLP- BadDLLP- Rollover- Timeout- NonFatalErr+
AERCap: First Error Pointer: 00, GenCap+ CGenEn- ChkCap+ ChkEn-
Capabilities: [140 v1] Virtual Channel
Caps: LPEVC=0 RefClk=100ns PATEntryBits=1
Arb: Fixed- WRR32- WRR64- WRR128-
Ctrl: ArbSelect=Fixed
Status: InProgress-
VC0: Caps: PATOffset=00 MaxTimeSlots=1 RejSnoopTrans-
Arb: Fixed- WRR32- WRR64- WRR128- TWRR128- WRR256-
Ctrl: Enable+ ID=0 ArbSelect=Fixed TC/VC=ff
Status: NegoPending- InProgress-
Capabilities: [160 v1] Device Serial Number 00-15-17-ff-ff-24-14-12
Capabilities: [170 v1] Power Budgeting <?>
---
arch/mips/pci/pci-ar724x.c | 52 ++++++++++++++++++++++----------------------
1 files changed, 26 insertions(+), 26 deletions(-)
diff --git a/arch/mips/pci/pci-ar724x.c b/arch/mips/pci/pci-ar724x.c
index 342bf4a..bb4f216 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;
--
1.7.2.1
