arch/tile: tilegx PCI root complex support

This change implements PCIe root complex support for tilegx using
the kernel support layer for accessing the TRIO hardware shim.

Reviewed-by: Bjorn Helgaas <bhelgaas@google.com> [changes in 07487f3]
Signed-off-by: Chris Metcalf <cmetcalf@tilera.com>

arch/tile/Kconfig

@@ -356,6 +356,9 @@ config PCI
 	default y
 	select PCI_DOMAINS
 	select GENERIC_PCI_IOMAP
+	select TILE_GXIO_TRIO if TILEGX
+	select ARCH_SUPPORTS_MSI if TILEGX
+	select PCI_MSI if TILEGX
 	---help---
 	  Enable PCI root complex support, so PCIe endpoint devices can
 	  be attached to the Tile chip.  Many, but not all, PCI devices

arch/tile/include/asm/pci.h

@@ -16,8 +16,11 @@
 #define _ASM_TILE_PCI_H
 
 #include <linux/pci.h>
+#include <linux/numa.h>
 #include <asm-generic/pci_iomap.h>
 
+#ifndef __tilegx__
+
 /*
  * Structure of a PCI controller (host bridge)
  */
@@ -40,6 +43,91 @@ struct pci_controller {
 	struct resource mem_resources[3];
 };
 
+/*
+ * This flag tells if the platform is TILEmpower that needs
+ * special configuration for the PLX switch chip.
+ */
+extern int tile_plx_gen1;
+
+static inline void pci_iounmap(struct pci_dev *dev, void __iomem *addr) {}
+
+#define	TILE_NUM_PCIE	2
+
+#else
+
+#include <asm/page.h>
+#include <gxio/trio.h>
+
+/**
+ * We reserve the hugepage-size address range at the top of the 64-bit address
+ * space to serve as the PCI window, emulating the BAR0 space of an endpoint
+ * device. This window is used by the chip-to-chip applications running on
+ * the RC node. The reason for carving out this window is that Mem-Maps that
+ * back up this window will not overlap with those that map the real physical
+ * memory.
+ */
+#define PCIE_HOST_BAR0_SIZE		HPAGE_SIZE
+#define PCIE_HOST_BAR0_START		HPAGE_MASK
+
+/**
+ * The first PAGE_SIZE of the above "BAR" window is mapped to the
+ * gxpci_host_regs structure.
+ */
+#define PCIE_HOST_REGS_SIZE		PAGE_SIZE
+
+/*
+ * This is the PCI address where the Mem-Map interrupt regions start.
+ * We use the 2nd to the last huge page of the 64-bit address space.
+ * The last huge page is used for the rootcomplex "bar", for C2C purpose.
+ */
+#define	MEM_MAP_INTR_REGIONS_BASE	(HPAGE_MASK - HPAGE_SIZE)
+
+/*
+ * Each Mem-Map interrupt region occupies 4KB.
+ */
+#define	MEM_MAP_INTR_REGION_SIZE	(1<< TRIO_MAP_MEM_LIM__ADDR_SHIFT)
+
+/*
+ * Structure of a PCI controller (host bridge) on Gx.
+ */
+struct pci_controller {
+
+	/* Pointer back to the TRIO that this PCIe port is connected to. */
+	gxio_trio_context_t *trio;
+	int mac;		/* PCIe mac index on the TRIO shim */
+	int trio_index;		/* Index of TRIO shim that contains the MAC. */
+
+	int pio_mem_index;	/* PIO region index for memory access */
+
+	/*
+	 * Mem-Map regions for all the memory controllers so that Linux can
+	 * map all of its physical memory space to the PCI bus.
+	 */
+	int mem_maps[MAX_NUMNODES];
+
+	int index;		/* PCI domain number */
+	struct pci_bus *root_bus;
+
+	int last_busno;
+
+	struct pci_ops *ops;
+
+	/* Table that maps the INTx numbers to Linux irq numbers. */
+	int irq_intx_table[4];
+
+	struct resource mem_space;
+
+	/* Address ranges that are routed to this controller/bridge. */
+	struct resource mem_resources[3];
+};
+
+extern struct pci_controller pci_controllers[TILEGX_NUM_TRIO * TILEGX_TRIO_PCIES];
+extern gxio_trio_context_t trio_contexts[TILEGX_NUM_TRIO];
+
+extern void pci_iounmap(struct pci_dev *dev, void __iomem *);
+
+#endif /* __tilegx__ */
+
 /*
  * The hypervisor maps the entirety of CPA-space as bus addresses, so
  * bus addresses are physical addresses.  The networking and block
@@ -50,12 +138,8 @@ struct pci_controller {
 int __init tile_pci_init(void);
 int __init pcibios_init(void);
 
-static inline void pci_iounmap(struct pci_dev *dev, void __iomem *addr) {}
-
 void __devinit pcibios_fixup_bus(struct pci_bus *bus);
 
-#define	TILE_NUM_PCIE	2
-
 #define pci_domain_nr(bus) (((struct pci_controller *)(bus)->sysdata)->index)
 
 /*
@@ -79,12 +163,6 @@ static inline int pcibios_assign_all_busses(void)
 #define PCIBIOS_MIN_MEM		0
 #define PCIBIOS_MIN_IO		0
 
-/*
- * This flag tells if the platform is TILEmpower that needs
- * special configuration for the PLX switch chip.
- */
-extern int tile_plx_gen1;
-
 /* Use any cpu for PCI. */
 #define cpumask_of_pcibus(bus) cpu_online_mask
 

arch/tile/kernel/Makefile

@@ -14,4 +14,8 @@ obj-$(CONFIG_SMP)		+= smpboot.o smp.o tlb.o
 obj-$(CONFIG_MODULES)		+= module.o
 obj-$(CONFIG_EARLY_PRINTK)	+= early_printk.o
 obj-$(CONFIG_KEXEC)		+= machine_kexec.o relocate_kernel_$(BITS).o
+ifdef CONFIG_TILEGX
+obj-$(CONFIG_PCI)		+= pci_gx.o
+else
 obj-$(CONFIG_PCI)		+= pci.o
+endif

arch/tile/kernel/setup.c

@@ -1344,6 +1344,7 @@ void __init setup_arch(char **cmdline_p)
 
 
 #ifdef CONFIG_PCI
+#if !defined (__tilegx__)
 	/*
 	 * Initialize the PCI structures.  This is done before memory
 	 * setup so that we know whether or not a pci_reserve region
@@ -1351,6 +1352,7 @@ void __init setup_arch(char **cmdline_p)
 	 */
 	if (tile_pci_init() == 0)
 		pci_reserve_mb = 0;
+#endif
 
 	/* PCI systems reserve a region just below 4GB for mapping iomem. */
 	pci_reserve_end_pfn  = (1 << (32 - PAGE_SHIFT));
@@ -1379,6 +1381,10 @@ void __init setup_arch(char **cmdline_p)
 	setup_cpu(1);
 	setup_clock();
 	load_hv_initrd();
+
+#if defined(CONFIG_PCI) && defined (__tilegx__)
+	tile_pci_init();
+#endif
 }
 
 

arch/tile/mm/pgtable.c

@@ -575,13 +575,6 @@ void __iomem *ioremap_prot(resource_size_t phys_addr, unsigned long size,
 }
 EXPORT_SYMBOL(ioremap_prot);
 
-/* Map a PCI MMIO bus address into VA space. */
-void __iomem *ioremap(resource_size_t phys_addr, unsigned long size)
-{
-	panic("ioremap for PCI MMIO is not supported");
-}
-EXPORT_SYMBOL(ioremap);
-
 /* Unmap an MMIO VA mapping. */
 void iounmap(volatile void __iomem *addr_in)
 {

drivers/pci/quirks.c

@@ -2143,9 +2143,9 @@ DECLARE_PCI_FIXUP_EARLY(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_82865_HB,
 DECLARE_PCI_FIXUP_EARLY(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_82875_HB,
 			quirk_unhide_mch_dev6);
 
-#ifdef CONFIG_TILE
+#ifdef CONFIG_TILEPRO
 /*
- * The Tilera TILEmpower platform needs to set the link speed
+ * The Tilera TILEmpower tilepro platform needs to set the link speed
  * to 2.5GT(Giga-Transfers)/s (Gen 1). The default link speed
  * setting is 5GT/s (Gen 2). 0x98 is the Link Control2 PCIe
  * capability register of the PEX8624 PCIe switch. The switch
@@ -2160,7 +2160,7 @@ static void __devinit quirk_tile_plx_gen1(struct pci_dev *dev)
 	}
 }
 DECLARE_PCI_FIXUP_EARLY(PCI_VENDOR_ID_PLX, 0x8624, quirk_tile_plx_gen1);
-#endif /* CONFIG_TILE */
+#endif /* CONFIG_TILEPRO */
 
 #ifdef CONFIG_PCI_MSI
 /* Some chipsets do not support MSI. We cannot easily rely on setting