mirror of
git://projects.qi-hardware.com/openwrt-xburst.git
synced 2024-11-01 20:33:08 +02:00
97e6f60806
git-svn-id: svn://svn.openwrt.org/openwrt/trunk@32605 3c298f89-4303-0410-b956-a3cf2f4a3e73
79 lines
2.2 KiB
Diff
79 lines
2.2 KiB
Diff
From 9cfa64ddaba49975b420ce5e5020efc3301061ac Mon Sep 17 00:00:00 2001
|
|
From: Gabor Juhos <juhosg@openwrt.org>
|
|
Date: Tue, 26 Jun 2012 10:19:46 +0200
|
|
Subject: [PATCH 01/34] MIPS: pci-ar724x: avoid data bus error due to a missing PCIe module
|
|
|
|
If the controller has no PCIe module attached,
|
|
accessing of the device configuration space
|
|
causes a data bus error. Avoid this by checking
|
|
the status of the PCIe link in advance, and
|
|
indicate an error if the link is down.
|
|
|
|
Signed-off-by: Gabor Juhos <juhosg@openwrt.org>
|
|
---
|
|
arch/mips/pci/pci-ar724x.c | 22 ++++++++++++++++++++++
|
|
1 files changed, 22 insertions(+), 0 deletions(-)
|
|
|
|
--- a/arch/mips/pci/pci-ar724x.c
|
|
+++ b/arch/mips/pci/pci-ar724x.c
|
|
@@ -23,9 +23,12 @@
|
|
#define AR724X_PCI_MEM_BASE 0x10000000
|
|
#define AR724X_PCI_MEM_SIZE 0x08000000
|
|
|
|
+#define AR724X_PCI_REG_RESET 0x18
|
|
#define AR724X_PCI_REG_INT_STATUS 0x4c
|
|
#define AR724X_PCI_REG_INT_MASK 0x50
|
|
|
|
+#define AR724X_PCI_RESET_LINK_UP BIT(0)
|
|
+
|
|
#define AR724X_PCI_INT_DEV0 BIT(14)
|
|
|
|
#define AR724X_PCI_IRQ_COUNT 1
|
|
@@ -38,6 +41,15 @@ static void __iomem *ar724x_pci_ctrl_bas
|
|
|
|
static u32 ar724x_pci_bar0_value;
|
|
static bool ar724x_pci_bar0_is_cached;
|
|
+static bool ar724x_pci_link_up;
|
|
+
|
|
+static inline bool ar724x_pci_check_link(void)
|
|
+{
|
|
+ u32 reset;
|
|
+
|
|
+ reset = __raw_readl(ar724x_pci_ctrl_base + AR724X_PCI_REG_RESET);
|
|
+ return reset & AR724X_PCI_RESET_LINK_UP;
|
|
+}
|
|
|
|
static int ar724x_pci_read(struct pci_bus *bus, unsigned int devfn, int where,
|
|
int size, uint32_t *value)
|
|
@@ -46,6 +58,9 @@ static int ar724x_pci_read(struct pci_bu
|
|
void __iomem *base;
|
|
u32 data;
|
|
|
|
+ if (!ar724x_pci_link_up)
|
|
+ return PCIBIOS_DEVICE_NOT_FOUND;
|
|
+
|
|
if (devfn)
|
|
return PCIBIOS_DEVICE_NOT_FOUND;
|
|
|
|
@@ -96,6 +111,9 @@ static int ar724x_pci_write(struct pci_b
|
|
u32 data;
|
|
int s;
|
|
|
|
+ if (!ar724x_pci_link_up)
|
|
+ return PCIBIOS_DEVICE_NOT_FOUND;
|
|
+
|
|
if (devfn)
|
|
return PCIBIOS_DEVICE_NOT_FOUND;
|
|
|
|
@@ -280,6 +298,10 @@ int __init ar724x_pcibios_init(int irq)
|
|
if (ar724x_pci_ctrl_base == NULL)
|
|
goto err_unmap_devcfg;
|
|
|
|
+ ar724x_pci_link_up = ar724x_pci_check_link();
|
|
+ if (!ar724x_pci_link_up)
|
|
+ pr_warn("ar724x: PCIe link is down\n");
|
|
+
|
|
ar724x_pci_irq_init(irq);
|
|
register_pci_controller(&ar724x_pci_controller);
|
|
|