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authorGabor Juhos <juhosg@openwrt.org>2013-02-03 14:52:47 +0000
committerJohn Crispin <blogic@openwrt.org>2013-02-17 01:25:39 +0100
commit12401fc28d40aa5bf8bda6991a96b6d7a3dae3ac (patch)
treed882d6fc588107ee1ba9a5c3d92660641451b2df /arch/mips
parent8b66d461187ff61c5755001af7296e6edde48423 (diff)
MIPS: pci-ar724x: setup command register of the PCI controller
The command register of the PCI controller is not initialized correctly by the bootloader on some boards and this leads to non working PCI bus. Add code to initialize the command register from the Linux code to avoid this. Signed-off-by: Gabor Juhos <juhosg@openwrt.org> Patchwork: http://patchwork.linux-mips.org/patch/4916/ Signed-off-by: John Crispin <blogic@openwrt.org>
Diffstat (limited to 'arch/mips')
-rw-r--r--arch/mips/ath79/pci.c10
-rw-r--r--arch/mips/include/asm/mach-ath79/ar71xx_regs.h2
-rw-r--r--arch/mips/pci/pci-ar724x.c63
3 files changed, 74 insertions, 1 deletions
diff --git a/arch/mips/ath79/pci.c b/arch/mips/ath79/pci.c
index 45d1112de50d..942e3f9184f0 100644
--- a/arch/mips/ath79/pci.c
+++ b/arch/mips/ath79/pci.c
@@ -139,13 +139,14 @@ static struct platform_device *
ath79_register_pci_ar724x(int id,
unsigned long cfg_base,
unsigned long ctrl_base,
+ unsigned long crp_base,
unsigned long mem_base,
unsigned long mem_size,
unsigned long io_base,
int irq)
{
struct platform_device *pdev;
- struct resource res[5];
+ struct resource res[6];
memset(res, 0, sizeof(res));
@@ -173,6 +174,11 @@ ath79_register_pci_ar724x(int id,
res[4].start = io_base;
res[4].end = io_base;
+ res[5].name = "crp_base";
+ res[5].flags = IORESOURCE_MEM;
+ res[5].start = crp_base;
+ res[5].end = crp_base + AR724X_PCI_CRP_SIZE - 1;
+
pdev = platform_device_register_simple("ar724x-pci", id,
res, ARRAY_SIZE(res));
return pdev;
@@ -188,6 +194,7 @@ int __init ath79_register_pci(void)
pdev = ath79_register_pci_ar724x(-1,
AR724X_PCI_CFG_BASE,
AR724X_PCI_CTRL_BASE,
+ AR724X_PCI_CRP_BASE,
AR724X_PCI_MEM_BASE,
AR724X_PCI_MEM_SIZE,
0,
@@ -203,6 +210,7 @@ int __init ath79_register_pci(void)
pdev = ath79_register_pci_ar724x(-1,
AR724X_PCI_CFG_BASE,
AR724X_PCI_CTRL_BASE,
+ AR724X_PCI_CRP_BASE,
AR724X_PCI_MEM_BASE,
AR724X_PCI_MEM_SIZE,
0,
diff --git a/arch/mips/include/asm/mach-ath79/ar71xx_regs.h b/arch/mips/include/asm/mach-ath79/ar71xx_regs.h
index 7c87bfe6e4ff..a77f6ee70ec1 100644
--- a/arch/mips/include/asm/mach-ath79/ar71xx_regs.h
+++ b/arch/mips/include/asm/mach-ath79/ar71xx_regs.h
@@ -67,6 +67,8 @@
#define AR724X_PCI_CFG_BASE 0x14000000
#define AR724X_PCI_CFG_SIZE 0x1000
+#define AR724X_PCI_CRP_BASE (AR71XX_APB_BASE + 0x000c0000)
+#define AR724X_PCI_CRP_SIZE 0x1000
#define AR724X_PCI_CTRL_BASE (AR71XX_APB_BASE + 0x000f0000)
#define AR724X_PCI_CTRL_SIZE 0x100
diff --git a/arch/mips/pci/pci-ar724x.c b/arch/mips/pci/pci-ar724x.c
index 0440d8800f8a..8a0700d448fe 100644
--- a/arch/mips/pci/pci-ar724x.c
+++ b/arch/mips/pci/pci-ar724x.c
@@ -29,9 +29,17 @@
#define AR7240_BAR0_WAR_VALUE 0xffff
+#define AR724X_PCI_CMD_INIT (PCI_COMMAND_MEMORY | \
+ PCI_COMMAND_MASTER | \
+ PCI_COMMAND_INVALIDATE | \
+ PCI_COMMAND_PARITY | \
+ PCI_COMMAND_SERR | \
+ PCI_COMMAND_FAST_BACK)
+
struct ar724x_pci_controller {
void __iomem *devcfg_base;
void __iomem *ctrl_base;
+ void __iomem *crp_base;
int irq;
int irq_base;
@@ -64,6 +72,51 @@ pci_bus_to_ar724x_controller(struct pci_bus *bus)
return container_of(hose, struct ar724x_pci_controller, pci_controller);
}
+static int ar724x_pci_local_write(struct ar724x_pci_controller *apc,
+ int where, int size, u32 value)
+{
+ unsigned long flags;
+ void __iomem *base;
+ u32 data;
+ int s;
+
+ WARN_ON(where & (size - 1));
+
+ if (!apc->link_up)
+ return PCIBIOS_DEVICE_NOT_FOUND;
+
+ base = apc->crp_base;
+
+ spin_lock_irqsave(&apc->lock, flags);
+ data = __raw_readl(base + (where & ~3));
+
+ switch (size) {
+ case 1:
+ s = ((where & 3) * 8);
+ data &= ~(0xff << s);
+ data |= ((value & 0xff) << s);
+ break;
+ case 2:
+ s = ((where & 2) * 8);
+ data &= ~(0xffff << s);
+ data |= ((value & 0xffff) << s);
+ break;
+ case 4:
+ data = value;
+ break;
+ default:
+ spin_unlock_irqrestore(&apc->lock, flags);
+ return PCIBIOS_BAD_REGISTER_NUMBER;
+ }
+
+ __raw_writel(data, base + (where & ~3));
+ /* flush write */
+ __raw_readl(base + (where & ~3));
+ spin_unlock_irqrestore(&apc->lock, flags);
+
+ return PCIBIOS_SUCCESSFUL;
+}
+
static int ar724x_pci_read(struct pci_bus *bus, unsigned int devfn, int where,
int size, uint32_t *value)
{
@@ -324,6 +377,14 @@ static int ar724x_pci_probe(struct platform_device *pdev)
if (!apc->devcfg_base)
return -EBUSY;
+ res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "crp_base");
+ if (!res)
+ return -EINVAL;
+
+ apc->crp_base = devm_request_and_ioremap(&pdev->dev, res);
+ if (apc->crp_base == NULL)
+ return -EBUSY;
+
apc->irq = platform_get_irq(pdev, 0);
if (apc->irq < 0)
return -EINVAL;
@@ -360,6 +421,8 @@ static int ar724x_pci_probe(struct platform_device *pdev)
ar724x_pci_irq_init(apc, id);
+ ar724x_pci_local_write(apc, PCI_COMMAND, 4, AR724X_PCI_CMD_INIT);
+
register_pci_controller(&apc->pci_controller);
return 0;