aboutsummaryrefslogtreecommitdiff
path: root/arch/mips/pci/pci-xlp.c
diff options
context:
space:
mode:
Diffstat (limited to 'arch/mips/pci/pci-xlp.c')
-rw-r--r--arch/mips/pci/pci-xlp.c156
1 files changed, 96 insertions, 60 deletions
diff --git a/arch/mips/pci/pci-xlp.c b/arch/mips/pci/pci-xlp.c
index 140557a2048..653d2db9e0c 100644
--- a/arch/mips/pci/pci-xlp.c
+++ b/arch/mips/pci/pci-xlp.c
@@ -46,6 +46,7 @@
#include <asm/netlogic/interrupt.h>
#include <asm/netlogic/haldefs.h>
+#include <asm/netlogic/common.h>
#include <asm/netlogic/xlp-hal/iomap.h>
#include <asm/netlogic/xlp-hal/pic.h>
@@ -55,7 +56,7 @@
static void *pci_config_base;
-#define pci_cfg_addr(bus, devfn, off) (((bus) << 20) | ((devfn) << 12) | (off))
+#define pci_cfg_addr(bus, devfn, off) (((bus) << 20) | ((devfn) << 12) | (off))
/* PCI ops */
static inline u32 pci_cfg_read_32bit(struct pci_bus *bus, unsigned int devfn,
@@ -64,8 +65,12 @@ static inline u32 pci_cfg_read_32bit(struct pci_bus *bus, unsigned int devfn,
u32 data;
u32 *cfgaddr;
+ where &= ~3;
+ if (bus->number == 0 && PCI_SLOT(devfn) == 1 && where == 0x954)
+ return 0xffffffff;
+
cfgaddr = (u32 *)(pci_config_base +
- pci_cfg_addr(bus->number, devfn, where & ~3));
+ pci_cfg_addr(bus->number, devfn, where));
data = *cfgaddr;
return data;
}
@@ -135,54 +140,60 @@ struct pci_ops nlm_pci_ops = {
};
static struct resource nlm_pci_mem_resource = {
- .name = "XLP PCI MEM",
- .start = 0xd0000000UL, /* 256MB PCI mem @ 0xd000_0000 */
- .end = 0xdfffffffUL,
- .flags = IORESOURCE_MEM,
+ .name = "XLP PCI MEM",
+ .start = 0xd0000000UL, /* 256MB PCI mem @ 0xd000_0000 */
+ .end = 0xdfffffffUL,
+ .flags = IORESOURCE_MEM,
};
static struct resource nlm_pci_io_resource = {
- .name = "XLP IO MEM",
- .start = 0x14000000UL, /* 64MB PCI IO @ 0x1000_0000 */
- .end = 0x17ffffffUL,
- .flags = IORESOURCE_IO,
+ .name = "XLP IO MEM",
+ .start = 0x14000000UL, /* 64MB PCI IO @ 0x1000_0000 */
+ .end = 0x17ffffffUL,
+ .flags = IORESOURCE_IO,
};
struct pci_controller nlm_pci_controller = {
- .index = 0,
- .pci_ops = &nlm_pci_ops,
- .mem_resource = &nlm_pci_mem_resource,
- .mem_offset = 0x00000000UL,
- .io_resource = &nlm_pci_io_resource,
- .io_offset = 0x00000000UL,
+ .index = 0,
+ .pci_ops = &nlm_pci_ops,
+ .mem_resource = &nlm_pci_mem_resource,
+ .mem_offset = 0x00000000UL,
+ .io_resource = &nlm_pci_io_resource,
+ .io_offset = 0x00000000UL,
};
-static int get_irq_vector(const struct pci_dev *dev)
+static struct pci_dev *xlp_get_pcie_link(const struct pci_dev *dev)
{
- /*
- * For XLP PCIe, there is an IRQ per Link, find out which
- * link the device is on to assign interrupts
- */
- if (dev->bus->self == NULL)
- return 0;
+ struct pci_bus *bus, *p;
- switch (dev->bus->self->devfn) {
- case 0x8:
- return PIC_PCIE_LINK_0_IRQ;
- case 0x9:
- return PIC_PCIE_LINK_1_IRQ;
- case 0xa:
- return PIC_PCIE_LINK_2_IRQ;
- case 0xb:
- return PIC_PCIE_LINK_3_IRQ;
- }
- WARN(1, "Unexpected devfn %d\n", dev->bus->self->devfn);
- return 0;
+ /* Find the bridge on bus 0 */
+ bus = dev->bus;
+ for (p = bus->parent; p && p->number != 0; p = p->parent)
+ bus = p;
+
+ return p ? bus->self : NULL;
+}
+
+static inline int nlm_pci_link_to_irq(int link)
+{
+ return PIC_PCIE_LINK_0_IRQ + link;
}
int __init pcibios_map_irq(const struct pci_dev *dev, u8 slot, u8 pin)
{
- return get_irq_vector(dev);
+ struct pci_dev *lnkdev;
+ int lnkslot, lnkfunc;
+
+ /*
+ * For XLP PCIe, there is an IRQ per Link, find out which
+ * link the device is on to assign interrupts
+ */
+ lnkdev = xlp_get_pcie_link(dev);
+ if (lnkdev == NULL)
+ return 0;
+ lnkfunc = PCI_FUNC(lnkdev->devfn);
+ lnkslot = PCI_SLOT(lnkdev->devfn);
+ return nlm_irq_to_xirq(lnkslot / 8, nlm_pci_link_to_irq(lnkfunc));
}
/* Do platform specific device initialization at pci_enable_device() time */
@@ -191,51 +202,76 @@ int pcibios_plat_dev_init(struct pci_dev *dev)
return 0;
}
-static int xlp_enable_pci_bswap(void)
+/*
+ * If big-endian, enable hardware byteswap on the PCIe bridges.
+ * This will make both the SoC and PCIe devices behave consistently with
+ * readl/writel.
+ */
+#ifdef __BIG_ENDIAN
+static void xlp_config_pci_bswap(int node, int link)
{
- uint64_t pciebase, sysbase;
- int node, i;
+ uint64_t nbubase, lnkbase;
u32 reg;
- /* Chip-0 so node set to 0 */
- node = 0;
- sysbase = nlm_get_bridge_regbase(node);
+ nbubase = nlm_get_bridge_regbase(node);
+ lnkbase = nlm_get_pcie_base(node, link);
+
/*
* Enable byte swap in hardware. Program each link's PCIe SWAP regions
* from the link's address ranges.
*/
- for (i = 0; i < 4; i++) {
- pciebase = nlm_pcicfg_base(XLP_IO_PCIE_OFFSET(node, i));
- if (nlm_read_pci_reg(pciebase, 0) == 0xffffffff)
- continue;
+ reg = nlm_read_bridge_reg(nbubase, BRIDGE_PCIEMEM_BASE0 + link);
+ nlm_write_pci_reg(lnkbase, PCIE_BYTE_SWAP_MEM_BASE, reg);
- reg = nlm_read_bridge_reg(sysbase, BRIDGE_PCIEMEM_BASE0 + i);
- nlm_write_pci_reg(pciebase, PCIE_BYTE_SWAP_MEM_BASE, reg);
+ reg = nlm_read_bridge_reg(nbubase, BRIDGE_PCIEMEM_LIMIT0 + link);
+ nlm_write_pci_reg(lnkbase, PCIE_BYTE_SWAP_MEM_LIM, reg | 0xfff);
- reg = nlm_read_bridge_reg(sysbase, BRIDGE_PCIEMEM_LIMIT0 + i);
- nlm_write_pci_reg(pciebase, PCIE_BYTE_SWAP_MEM_LIM,
- reg | 0xfff);
+ reg = nlm_read_bridge_reg(nbubase, BRIDGE_PCIEIO_BASE0 + link);
+ nlm_write_pci_reg(lnkbase, PCIE_BYTE_SWAP_IO_BASE, reg);
- reg = nlm_read_bridge_reg(sysbase, BRIDGE_PCIEIO_BASE0 + i);
- nlm_write_pci_reg(pciebase, PCIE_BYTE_SWAP_IO_BASE, reg);
-
- reg = nlm_read_bridge_reg(sysbase, BRIDGE_PCIEIO_LIMIT0 + i);
- nlm_write_pci_reg(pciebase, PCIE_BYTE_SWAP_IO_LIM, reg | 0xfff);
- }
- return 0;
+ reg = nlm_read_bridge_reg(nbubase, BRIDGE_PCIEIO_LIMIT0 + link);
+ nlm_write_pci_reg(lnkbase, PCIE_BYTE_SWAP_IO_LIM, reg | 0xfff);
}
+#else
+/* Swap configuration not needed in little-endian mode */
+static inline void xlp_config_pci_bswap(int node, int link) {}
+#endif /* __BIG_ENDIAN */
static int __init pcibios_init(void)
{
+ struct nlm_soc_info *nodep;
+ uint64_t pciebase;
+ int link, n;
+ u32 reg;
+
/* Firmware assigns PCI resources */
pci_set_flags(PCI_PROBE_ONLY);
pci_config_base = ioremap(XLP_DEFAULT_PCI_ECFG_BASE, 64 << 20);
/* Extend IO port for memory mapped io */
- ioport_resource.start = 0;
+ ioport_resource.start = 0;
ioport_resource.end = ~0;
- xlp_enable_pci_bswap();
+ for (n = 0; n < NLM_NR_NODES; n++) {
+ nodep = nlm_get_node(n);
+ if (!nodep->coremask)
+ continue; /* node does not exist */
+
+ for (link = 0; link < 4; link++) {
+ pciebase = nlm_get_pcie_base(n, link);
+ if (nlm_read_pci_reg(pciebase, 0) == 0xffffffff)
+ continue;
+ xlp_config_pci_bswap(n, link);
+
+ /* put in intpin and irq - u-boot does not */
+ reg = nlm_read_pci_reg(pciebase, 0xf);
+ reg &= ~0x1fu;
+ reg |= (1 << 8) | nlm_pci_link_to_irq(link);
+ nlm_write_pci_reg(pciebase, 0xf, reg);
+ pr_info("XLP PCIe: Link %d-%d initialized.\n", n, link);
+ }
+ }
+
set_io_port_base(CKSEG1);
nlm_pci_controller.io_map_base = CKSEG1;
generated by cgit v1.2.3-18-g5258 (git 2.32.0) at 2024-12-27 00:24:41 +0000