pci root complex: support for tile architecture
This change enables PCI root complex support for TILEPro. Unlike
TILE-Gx, TILEPro has no support for memory-mapped I/O, so the PCI
support consists of hypervisor upcalls for PIO, DMA, etc. However,
the performance is fine for the devices we have tested with so far
(1Gb Ethernet, SATA, etc.).
The <asm/io.h> header was tweaked to be a little bit more aggressive
about disabling attempts to map/unmap IO port space. The hacky
<asm/pci-bridge.h> header was rolled into the <asm/pci.h> header
and the result was simplified. Both of the latter two headers were
preliminary versions not meant for release before now - oh well.
There is one quirk for our TILEmpower platform, which accidentally
negotiates up to 5GT and needs to be kicked down to 2.5GT.
Signed-off-by: Chris Metcalf <cmetcalf@tilera.com>
diff --git a/arch/tile/include/asm/pci.h b/arch/tile/include/asm/pci.h
index b0c15da..c3fc458 100644
--- a/arch/tile/include/asm/pci.h
+++ b/arch/tile/include/asm/pci.h
@@ -15,7 +15,29 @@
#ifndef _ASM_TILE_PCI_H
#define _ASM_TILE_PCI_H
-#include <asm/pci-bridge.h>
+#include <linux/pci.h>
+
+/*
+ * Structure of a PCI controller (host bridge)
+ */
+struct pci_controller {
+ int index; /* PCI domain number */
+ struct pci_bus *root_bus;
+
+ int first_busno;
+ int last_busno;
+
+ int hv_cfg_fd[2]; /* config{0,1} fds for this PCIe controller */
+ int hv_mem_fd; /* fd to Hypervisor for MMIO operations */
+
+ struct pci_ops *ops;
+
+ int irq_base; /* Base IRQ from the Hypervisor */
+ int plx_gen1; /* flag for PLX Gen 1 configuration */
+
+ /* Address ranges that are routed to this controller/bridge. */
+ struct resource mem_resources[3];
+};
/*
* The hypervisor maps the entirety of CPA-space as bus addresses, so
@@ -24,57 +46,13 @@
*/
#define PCI_DMA_BUS_IS_PHYS 1
-struct pci_controller *pci_bus_to_hose(int bus);
-unsigned char __init common_swizzle(struct pci_dev *dev, unsigned char *pinp);
int __init tile_pci_init(void);
-void pci_iounmap(struct pci_dev *dev, void __iomem *addr);
+
void __iomem *pci_iomap(struct pci_dev *dev, int bar, unsigned long max);
+static inline void pci_iounmap(struct pci_dev *dev, void __iomem *addr) {}
+
void __devinit pcibios_fixup_bus(struct pci_bus *bus);
-int __devinit _tile_cfg_read(struct pci_controller *hose,
- int bus,
- int slot,
- int function,
- int offset,
- int size,
- u32 *val);
-int __devinit _tile_cfg_write(struct pci_controller *hose,
- int bus,
- int slot,
- int function,
- int offset,
- int size,
- u32 val);
-
-/*
- * These are used to to config reads and writes in the early stages of
- * setup before the driver infrastructure has been set up enough to be
- * able to do config reads and writes.
- */
-#define early_cfg_read(where, size, value) \
- _tile_cfg_read(controller, \
- current_bus, \
- pci_slot, \
- pci_fn, \
- where, \
- size, \
- value)
-
-#define early_cfg_write(where, size, value) \
- _tile_cfg_write(controller, \
- current_bus, \
- pci_slot, \
- pci_fn, \
- where, \
- size, \
- value)
-
-
-
-#define PCICFG_BYTE 1
-#define PCICFG_WORD 2
-#define PCICFG_DWORD 4
-
#define TILE_NUM_PCIE 2
#define pci_domain_nr(bus) (((struct pci_controller *)(bus)->sysdata)->index)
@@ -88,33 +66,33 @@
}
/*
- * I/O space is currently not supported.
+ * pcibios_assign_all_busses() tells whether or not the bus numbers
+ * should be reassigned, in case the BIOS didn't do it correctly, or
+ * in case we don't have a BIOS and we want to let Linux do it.
*/
+static inline int pcibios_assign_all_busses(void)
+{
+ return 1;
+}
-#define TILE_PCIE_LOWER_IO 0x0
-#define TILE_PCIE_UPPER_IO 0x10000
-#define TILE_PCIE_PCIE_IO_SIZE 0x0000FFFF
-
-#define _PAGE_NO_CACHE 0
-#define _PAGE_GUARDED 0
-
-
-#define pcibios_assign_all_busses() pci_assign_all_buses
-extern int pci_assign_all_buses;
-
+/*
+ * No special bus mastering setup handling.
+ */
static inline void pcibios_set_master(struct pci_dev *dev)
{
- /* No special bus mastering setup handling */
}
#define PCIBIOS_MIN_MEM 0
-#define PCIBIOS_MIN_IO TILE_PCIE_LOWER_IO
+#define PCIBIOS_MIN_IO 0
/*
* This flag tells if the platform is TILEmpower that needs
* special configuration for the PLX switch chip.
*/
-extern int blade_pci;
+extern int tile_plx_gen1;
+
+/* Use any cpu for PCI. */
+#define cpumask_of_pcibus(bus) cpu_online_mask
/* implement the pci_ DMA API in terms of the generic device dma_ one */
#include <asm-generic/pci-dma-compat.h>
@@ -122,7 +100,4 @@
/* generic pci stuff */
#include <asm-generic/pci.h>
-/* Use any cpu for PCI. */
-#define cpumask_of_pcibus(bus) cpu_online_mask
-
#endif /* _ASM_TILE_PCI_H */