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authorJayachandran C <jchandra@broadcom.com>2013-01-16 11:12:41 +0000
committerJohn Crispin <blogic@openwrt.org>2013-02-17 00:15:22 +0100
commit7b53eb4d40d702a7458588dcfcddaf4498dbbb36 (patch)
treea5039562ce54e0560b9235c915f4d5b0df11e060 /arch/mips/pci
parentcba3b643039b9d38284a5fd5143558622b9b64d9 (diff)
MIPS: PCI: Multi-node PCI support for Netlogic XLP
On a multi-chip XLP board, each node can have 4 PCIe links. Update XLP PCI code to initialize PCIe on all the nodes. Signed-off-by: Jayachandran C <jchandra@broadcom.com> Patchwork: http://patchwork.linux-mips.org/patch/4803/ Signed-off-by: John Crispin <blogic@openwrt.org>
Diffstat (limited to 'arch/mips/pci')
-rw-r--r--arch/mips/pci/pci-xlp.c109
1 files changed, 66 insertions, 43 deletions
diff --git a/arch/mips/pci/pci-xlp.c b/arch/mips/pci/pci-xlp.c
index fbf001a068a4..dd2d3eb3ad31 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>
@@ -161,32 +162,38 @@ struct pci_controller nlm_pci_controller = {
.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 */
@@ -201,45 +208,42 @@ int pcibios_plat_dev_init(struct pci_dev *dev)
* readl/writel.
*/
#ifdef __BIG_ENDIAN
-static void xlp_config_pci_bswap(void)
+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);
- }
+ 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(void) {}
+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);
@@ -248,7 +252,26 @@ static int __init pcibios_init(void)
ioport_resource.start = 0;
ioport_resource.end = ~0;
- xlp_config_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;