2 * Copyright 2010 Tilera Corporation. All Rights Reserved.
4 * This program is free software; you can redistribute it and/or
5 * modify it under the terms of the GNU General Public License
6 * as published by the Free Software Foundation, version 2.
8 * This program is distributed in the hope that it will be useful, but
9 * WITHOUT ANY WARRANTY; without even the implied warranty of
10 * MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or
11 * NON INFRINGEMENT. See the GNU General Public License for
15 #ifndef _ASM_TILE_PCI_H
16 #define _ASM_TILE_PCI_H
18 #include <linux/dma-mapping.h>
19 #include <linux/pci.h>
20 #include <linux/numa.h>
21 #include <asm-generic/pci_iomap.h>
26 * Structure of a PCI controller (host bridge)
28 struct pci_controller {
29 int index; /* PCI domain number */
30 struct pci_bus *root_bus;
34 int hv_cfg_fd[2]; /* config{0,1} fds for this PCIe controller */
35 int hv_mem_fd; /* fd to Hypervisor for MMIO operations */
39 int irq_base; /* Base IRQ from the Hypervisor */
40 int plx_gen1; /* flag for PLX Gen 1 configuration */
42 /* Address ranges that are routed to this controller/bridge. */
43 struct resource mem_resources[3];
47 * This flag tells if the platform is TILEmpower that needs
48 * special configuration for the PLX switch chip.
50 extern int tile_plx_gen1;
52 static inline void pci_iounmap(struct pci_dev *dev, void __iomem *addr) {}
54 #define TILE_NUM_PCIE 2
57 * The hypervisor maps the entirety of CPA-space as bus addresses, so
58 * bus addresses are physical addresses. The networking and block
59 * device layers use this boolean for bounce buffer decisions.
61 #define PCI_DMA_BUS_IS_PHYS 1
63 /* generic pci stuff */
64 #include <asm-generic/pci.h>
69 #include <gxio/trio.h>
72 * We reserve the hugepage-size address range at the top of the 64-bit address
73 * space to serve as the PCI window, emulating the BAR0 space of an endpoint
74 * device. This window is used by the chip-to-chip applications running on
75 * the RC node. The reason for carving out this window is that Mem-Maps that
76 * back up this window will not overlap with those that map the real physical
79 #define PCIE_HOST_BAR0_SIZE HPAGE_SIZE
80 #define PCIE_HOST_BAR0_START HPAGE_MASK
83 * The first PAGE_SIZE of the above "BAR" window is mapped to the
84 * gxpci_host_regs structure.
86 #define PCIE_HOST_REGS_SIZE PAGE_SIZE
89 * This is the PCI address where the Mem-Map interrupt regions start.
90 * We use the 2nd to the last huge page of the 64-bit address space.
91 * The last huge page is used for the rootcomplex "bar", for C2C purpose.
93 #define MEM_MAP_INTR_REGIONS_BASE (HPAGE_MASK - HPAGE_SIZE)
96 * Each Mem-Map interrupt region occupies 4KB.
98 #define MEM_MAP_INTR_REGION_SIZE (1 << TRIO_MAP_MEM_LIM__ADDR_SHIFT)
101 * Allocate the PCI BAR window right below 4GB.
103 #define TILE_PCI_BAR_WINDOW_TOP (1ULL << 32)
106 * Allocate 1GB for the PCI BAR window.
108 #define TILE_PCI_BAR_WINDOW_SIZE (1 << 30)
111 * This is the highest bus address targeting the host memory that
112 * can be generated by legacy PCI devices with 32-bit or less
113 * DMA capability, dictated by the BAR window size and location.
115 #define TILE_PCI_MAX_DIRECT_DMA_ADDRESS \
116 (TILE_PCI_BAR_WINDOW_TOP - TILE_PCI_BAR_WINDOW_SIZE - 1)
119 * We shift the PCI bus range for all the physical memory up by the whole PA
120 * range. The corresponding CPA of an incoming PCI request will be the PCI
121 * address minus TILE_PCI_MEM_MAP_BASE_OFFSET. This also implies
122 * that the 64-bit capable devices will be given DMA addresses as
123 * the CPA plus TILE_PCI_MEM_MAP_BASE_OFFSET. To support 32-bit
124 * devices, we create a separate map region that handles the low
127 #define TILE_PCI_MEM_MAP_BASE_OFFSET (1ULL << CHIP_PA_WIDTH())
130 * Start of the PCI memory resource, which starts at the end of the
131 * maximum system physical RAM address.
133 #define TILE_PCI_MEM_START (1ULL << CHIP_PA_WIDTH())
136 * Structure of a PCI controller (host bridge) on Gx.
138 struct pci_controller {
140 /* Pointer back to the TRIO that this PCIe port is connected to. */
141 gxio_trio_context_t *trio;
142 int mac; /* PCIe mac index on the TRIO shim */
143 int trio_index; /* Index of TRIO shim that contains the MAC. */
145 int pio_mem_index; /* PIO region index for memory access */
147 #ifdef CONFIG_TILE_PCI_IO
148 int pio_io_index; /* PIO region index for I/O space access */
152 * Mem-Map regions for all the memory controllers so that Linux can
153 * map all of its physical memory space to the PCI bus.
155 int mem_maps[MAX_NUMNODES];
157 int index; /* PCI domain number */
158 struct pci_bus *root_bus;
160 /* PCI I/O space resource for this controller. */
161 struct resource io_space;
162 char io_space_name[32];
164 /* PCI memory space resource for this controller. */
165 struct resource mem_space;
166 char mem_space_name[32];
168 uint64_t mem_offset; /* cpu->bus memory mapping offset. */
174 /* Table that maps the INTx numbers to Linux irq numbers. */
175 int irq_intx_table[4];
178 extern struct pci_controller pci_controllers[TILEGX_NUM_TRIO * TILEGX_TRIO_PCIES];
179 extern gxio_trio_context_t trio_contexts[TILEGX_NUM_TRIO];
180 extern int num_trio_shims;
182 extern void pci_iounmap(struct pci_dev *dev, void __iomem *);
185 * The PCI address space does not equal the physical memory address
186 * space (we have an IOMMU). The IDE and SCSI device layers use this
187 * boolean for bounce buffer decisions.
189 #define PCI_DMA_BUS_IS_PHYS 0
191 #endif /* __tilegx__ */
193 int __init tile_pci_init(void);
194 int __init pcibios_init(void);
196 void pcibios_fixup_bus(struct pci_bus *bus);
198 #define pci_domain_nr(bus) (((struct pci_controller *)(bus)->sysdata)->index)
201 * This decides whether to display the domain number in /proc.
203 static inline int pci_proc_domain(struct pci_bus *bus)
209 * pcibios_assign_all_busses() tells whether or not the bus numbers
210 * should be reassigned, in case the BIOS didn't do it correctly, or
211 * in case we don't have a BIOS and we want to let Linux do it.
213 static inline int pcibios_assign_all_busses(void)
218 #define PCIBIOS_MIN_MEM 0
219 /* Minimum PCI I/O address, starting at the page boundary. */
220 #define PCIBIOS_MIN_IO PAGE_SIZE
222 /* Use any cpu for PCI. */
223 #define cpumask_of_pcibus(bus) cpu_online_mask
225 /* implement the pci_ DMA API in terms of the generic device dma_ one */
226 #include <asm-generic/pci-dma-compat.h>
228 #endif /* _ASM_TILE_PCI_H */