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Diffstat (limited to 'kernel/arch/arm/mach-cns3xxx/pcie.c')
-rw-r--r--kernel/arch/arm/mach-cns3xxx/pcie.c71
1 files changed, 30 insertions, 41 deletions
diff --git a/kernel/arch/arm/mach-cns3xxx/pcie.c b/kernel/arch/arm/mach-cns3xxx/pcie.c
index c622c306c..47905a50e 100644
--- a/kernel/arch/arm/mach-cns3xxx/pcie.c
+++ b/kernel/arch/arm/mach-cns3xxx/pcie.c
@@ -65,8 +65,9 @@ static void __iomem *cns3xxx_pci_map_bus(struct pci_bus *bus,
/*
* The CNS PCI bridge doesn't fit into the PCI hierarchy, though
- * we still want to access it. For this to work, we must place
- * the first device on the same bus as the CNS PCI bridge.
+ * we still want to access it.
+ * We place the host bridge on bus 0, and the directly connected
+ * device on bus 1, slot 0.
*/
if (busno == 0) { /* internal PCIe bus, host bridge device */
if (devfn == 0) /* device# and function# are ignored by hw */
@@ -211,58 +212,46 @@ static void __init cns3xxx_pcie_check_link(struct cns3xxx_pcie *cnspci)
}
}
+static void cns3xxx_write_config(struct cns3xxx_pcie *cnspci,
+ int where, int size, u32 val)
+{
+ void __iomem *base = cnspci->host_regs + (where & 0xffc);
+ u32 v;
+ u32 mask = (0x1ull << (size * 8)) - 1;
+ int shift = (where % 4) * 8;
+
+ v = readl_relaxed(base + (where & 0xffc));
+
+ v &= ~(mask << shift);
+ v |= (val & mask) << shift;
+
+ writel_relaxed(v, base + (where & 0xffc));
+ readl_relaxed(base + (where & 0xffc));
+}
+
static void __init cns3xxx_pcie_hw_init(struct cns3xxx_pcie *cnspci)
{
- int port = cnspci->port;
- struct pci_sys_data sd = {
- .private_data = cnspci,
- };
- struct pci_bus bus = {
- .number = 0,
- .ops = &cns3xxx_pcie_ops,
- .sysdata = &sd,
- };
u16 mem_base = cnspci->res_mem.start >> 16;
u16 mem_limit = cnspci->res_mem.end >> 16;
u16 io_base = cnspci->res_io.start >> 16;
u16 io_limit = cnspci->res_io.end >> 16;
- u32 devfn = 0;
- u8 tmp8;
- u16 pos;
- u16 dc;
-
- pci_bus_write_config_byte(&bus, devfn, PCI_PRIMARY_BUS, 0);
- pci_bus_write_config_byte(&bus, devfn, PCI_SECONDARY_BUS, 1);
- pci_bus_write_config_byte(&bus, devfn, PCI_SUBORDINATE_BUS, 1);
- pci_bus_read_config_byte(&bus, devfn, PCI_PRIMARY_BUS, &tmp8);
- pci_bus_read_config_byte(&bus, devfn, PCI_SECONDARY_BUS, &tmp8);
- pci_bus_read_config_byte(&bus, devfn, PCI_SUBORDINATE_BUS, &tmp8);
-
- pci_bus_write_config_word(&bus, devfn, PCI_MEMORY_BASE, mem_base);
- pci_bus_write_config_word(&bus, devfn, PCI_MEMORY_LIMIT, mem_limit);
- pci_bus_write_config_word(&bus, devfn, PCI_IO_BASE_UPPER16, io_base);
- pci_bus_write_config_word(&bus, devfn, PCI_IO_LIMIT_UPPER16, io_limit);
+ cns3xxx_write_config(cnspci, PCI_PRIMARY_BUS, 1, 0);
+ cns3xxx_write_config(cnspci, PCI_SECONDARY_BUS, 1, 1);
+ cns3xxx_write_config(cnspci, PCI_SUBORDINATE_BUS, 1, 1);
+ cns3xxx_write_config(cnspci, PCI_MEMORY_BASE, 2, mem_base);
+ cns3xxx_write_config(cnspci, PCI_MEMORY_LIMIT, 2, mem_limit);
+ cns3xxx_write_config(cnspci, PCI_IO_BASE_UPPER16, 2, io_base);
+ cns3xxx_write_config(cnspci, PCI_IO_LIMIT_UPPER16, 2, io_limit);
if (!cnspci->linked)
return;
/* Set Device Max_Read_Request_Size to 128 byte */
- bus.number = 1; /* directly connected PCIe device */
- devfn = PCI_DEVFN(0, 0);
- pos = pci_bus_find_capability(&bus, devfn, PCI_CAP_ID_EXP);
- pci_bus_read_config_word(&bus, devfn, pos + PCI_EXP_DEVCTL, &dc);
- if (dc & PCI_EXP_DEVCTL_READRQ) {
- dc &= ~PCI_EXP_DEVCTL_READRQ;
- pci_bus_write_config_word(&bus, devfn, pos + PCI_EXP_DEVCTL, dc);
- pci_bus_read_config_word(&bus, devfn, pos + PCI_EXP_DEVCTL, &dc);
- if (dc & PCI_EXP_DEVCTL_READRQ)
- pr_warn("PCIe: Unable to set device Max_Read_Request_Size\n");
- else
- pr_info("PCIe: Max_Read_Request_Size set to 128 bytes\n");
- }
+ pcie_bus_config = PCIE_BUS_PEER2PEER;
+
/* Disable PCIe0 Interrupt Mask INTA to INTD */
- __raw_writel(~0x3FFF, MISC_PCIE_INT_MASK(port));
+ __raw_writel(~0x3FFF, MISC_PCIE_INT_MASK(cnspci->port));
}
static int cns3xxx_pcie_abort_handler(unsigned long addr, unsigned int fsr,