MIPS: ath79: add a workaround for a PCI controller bug in AR7240 SoCs
The PCI controller of the AR724X SoCs has a hardware bag. If the BAR0 register of the PCI device is set to the proper base address, the memory address space of the device is not accessible. When the device driver tries to access the memory address space of the PCI device, it leads to data bus error, similiar to this: Data bus error, epc == 801f69a0, ra == 801f698c Oops[#1]: Cpu 0 $ 0 : 00000000 00000061 deadbeef 000000ff $ 4 : 00000000 000000ff 00000014 00000000 $ 8 : ff000000 fffffffc 00000000 00000000 $12 : 000001f5 00000006 00000000 6e637920 $16 : 81ca4000 81ca0260 81ca4000 804d70f0 $20 : fffffff4 0000002b 803ad4c4 00000000 $24 : 00000003 00000000 $28 : 81c20000 81c21c60 00000000 801f698c Hi : 00000000 Lo : 00000000 epc : 801f69a0 ath9k_hw_init+0xd0/0xa70 Not tainted ra : 801f698c ath9k_hw_init+0xbc/0xa70 Status: 1000c103 KERNEL EXL IE Cause : 1080001c PrId : 00019374 (MIPS 24Kc) Modules linked in: Process swapper (pid: 1, threadinfo=81c20000, task=81c18000, tls=00000000) Stack : 00000000 00000000 00000000 00000000 81c21c78 81ca0260 00000000 804d70f0 81ca0260 81c21cc0 81ca0e80 81ca0260 81ca4000 804d70f0 fffffff4 0000002b 803ad4c4 00000000 00000000 801e3ae8 81c9d080 81ca0e80 b0000000 800b9b9c 00000008 81c9d000 8031aeb0 802d38a0 00000000 81c14c00 81c14c60 00000000 81ca0e80 81ca0260 b0000000 801f08a4 81c9c820 81c21d48 81c9c820 80144320 ... Call Trace: [<801f69a0>] ath9k_hw_init+0xd0/0xa70 [<801e3ae8>] ath9k_init_device+0x174/0x680 [<801f08a4>] ath_pci_probe+0x27c/0x380 [<8019e490>] pci_device_probe+0x74/0x9c [<801bfadc>] driver_probe_device+0x9c/0x1b4 [<801bfcb0>] __driver_attach+0xbc/0xc4 [<801bea0c>] bus_for_each_dev+0x5c/0x98 [<801bf394>] bus_add_driver+0x1d0/0x2a4 [<801c0364>] driver_register+0x8c/0x16c [<8019e72c>] __pci_register_driver+0x4c/0xe4 [<803d3d40>] ath9k_init+0x3c/0x88 [<80060930>] do_one_initcall+0x3c/0x1cc [<803c297c>] kernel_init+0xa4/0x138 [<80063c04>] kernel_thread_helper+0x10/0x18 Signed-off-by: Gabor Juhos <juhosg@openwrt.org> Cc: linux-mips@linux-mips.org Patchwork: https://patchwork.linux-mips.org/patch/3494/ Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
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@ -9,6 +9,7 @@
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*/
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#include <linux/pci.h>
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#include <asm/mach-ath79/ath79.h>
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#include <asm/mach-ath79/pci.h>
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#define AR724X_PCI_CFG_BASE 0x14000000
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@ -16,9 +17,14 @@
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#define AR724X_PCI_MEM_BASE 0x10000000
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#define AR724X_PCI_MEM_SIZE 0x08000000
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#define AR7240_BAR0_WAR_VALUE 0xffff
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static DEFINE_SPINLOCK(ar724x_pci_lock);
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static void __iomem *ar724x_pci_devcfg_base;
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static u32 ar724x_pci_bar0_value;
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static bool ar724x_pci_bar0_is_cached;
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static int ar724x_pci_read(struct pci_bus *bus, unsigned int devfn, int where,
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int size, uint32_t *value)
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{
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@ -56,7 +62,14 @@ static int ar724x_pci_read(struct pci_bus *bus, unsigned int devfn, int where,
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}
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spin_unlock_irqrestore(&ar724x_pci_lock, flags);
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*value = data;
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if (where == PCI_BASE_ADDRESS_0 && size == 4 &&
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ar724x_pci_bar0_is_cached) {
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/* use the cached value */
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*value = ar724x_pci_bar0_value;
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} else {
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*value = data;
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}
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return PCIBIOS_SUCCESSFUL;
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}
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@ -72,6 +85,27 @@ static int ar724x_pci_write(struct pci_bus *bus, unsigned int devfn, int where,
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if (devfn)
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return PCIBIOS_DEVICE_NOT_FOUND;
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if (soc_is_ar7240() && where == PCI_BASE_ADDRESS_0 && size == 4) {
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if (value != 0xffffffff) {
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/*
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* WAR for a hw issue. If the BAR0 register of the
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* device is set to the proper base address, the
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* memory space of the device is not accessible.
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*
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* Cache the intended value so it can be read back,
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* and write a SoC specific constant value to the
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* BAR0 register in order to make the device memory
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* accessible.
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*/
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ar724x_pci_bar0_is_cached = true;
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ar724x_pci_bar0_value = value;
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value = AR7240_BAR0_WAR_VALUE;
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} else {
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ar724x_pci_bar0_is_cached = false;
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}
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}
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base = ar724x_pci_devcfg_base;
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spin_lock_irqsave(&ar724x_pci_lock, flags);
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