diff options
Diffstat (limited to 'arch/arm/plat-orion')
| -rw-r--r-- | arch/arm/plat-orion/pcie.c | 34 |
1 files changed, 34 insertions, 0 deletions
diff --git a/arch/arm/plat-orion/pcie.c b/arch/arm/plat-orion/pcie.c index 54c84a492a0f..779553a1595e 100644 --- a/arch/arm/plat-orion/pcie.c +++ b/arch/arm/plat-orion/pcie.c @@ -13,6 +13,7 @@ #include <linux/mbus.h> #include <asm/mach/pci.h> #include <plat/pcie.h> +#include <linux/delay.h> /* * PCIe unit register offsets. @@ -46,6 +47,8 @@ #define PCIE_STAT_BUS_OFFS 8 #define PCIE_STAT_BUS_MASK 0xff #define PCIE_STAT_LINK_DOWN 1 +#define PCIE_DEBUG_CTRL 0x1a60 +#define PCIE_DEBUG_SOFT_RESET (1<<20) u32 __init orion_pcie_dev_id(void __iomem *base) @@ -85,6 +88,32 @@ void __init orion_pcie_set_local_bus_nr(void __iomem *base, int nr) writel(stat, base + PCIE_STAT_OFF); } +void __init orion_pcie_reset(void __iomem *base) +{ + u32 reg; + int i; + + /* + * MV-S104860-U0, Rev. C: + * PCI Express Unit Soft Reset + * When set, generates an internal reset in the PCI Express unit. + * This bit should be cleared after the link is re-established. + */ + reg = readl(base + PCIE_DEBUG_CTRL); + reg |= PCIE_DEBUG_SOFT_RESET; + writel(reg, base + PCIE_DEBUG_CTRL); + + for (i = 0; i < 20; i++) { + mdelay(10); + + if (orion_pcie_link_up(base)) + break; + } + + reg &= ~(PCIE_DEBUG_SOFT_RESET); + writel(reg, base + PCIE_DEBUG_CTRL); +} + /* * Setup PCIE BARs and Address Decode Wins: * BAR[0,2] -> disabled, BAR[1] -> covers all DRAM banks @@ -153,6 +182,11 @@ void __init orion_pcie_setup(void __iomem *base, u32 mask; /* + * soft reset PCIe unit + */ + orion_pcie_reset(base); + + /* * Point PCIe unit MBUS decode windows to DRAM space. */ orion_pcie_setup_wins(base, dram); |