projects/linux·blob master · refs

193 lines · 6.2 KiB

1/* SPDX-License-Identifier: GPL-2.0 */
2/*
3 * linux/arch/alpha/kernel/pci_impl.h
4 *
5 * This file contains declarations and inline functions for interfacing
6 * with the PCI initialization routines.
7 */
8
9struct pci_dev;
10struct pci_controller;
11struct pci_iommu_arena;
12
13/*
14 * We can't just blindly use 64K for machines with EISA busses; they
15 * may also have PCI-PCI bridges present, and then we'd configure the
16 * bridge incorrectly.
17 *
18 * Also, we start at 0x8000 or 0x9000, in hopes to get all devices'
19 * IO space areas allocated *before* 0xC000; this is because certain
20 * BIOSes (Millennium for one) use PCI Config space "mechanism #2"
21 * accesses to probe the bus. If a device's registers appear at 0xC000,
22 * it may see an INx/OUTx at that address during BIOS emulation of the
23 * VGA BIOS, and some cards, notably Adaptec 2940UW, take mortal offense.
24 */
25
26#define EISA_DEFAULT_IO_BASE 0x9000 /* start above 8th slot */
27#define DEFAULT_IO_BASE 0x8000 /* start at 8th slot */
28
29/*
30 * We try to make the DEFAULT_MEM_BASE addresses *always* have more than
31 * a single bit set. This is so that devices like the broken Myrinet card
32 * will always have a PCI memory address that will never match a IDSEL
33 * address in PCI Config space, which can cause problems with early rev cards.
34 */
35
36/*
37 * An XL is AVANTI (APECS) family, *but* it has only 27 bits of ISA address
38 * that get passed through the PCI<->ISA bridge chip. Although this causes
39 * us to set the PCI->Mem window bases lower than normal, we still allocate
40 * PCI bus devices' memory addresses *below* the low DMA mapping window,
41 * and hope they fit below 64Mb (to avoid conflicts), and so that they can
42 * be accessed via SPARSE space.
43 *
44 * We accept the risk that a broken Myrinet card will be put into a true XL
45 * and thus can more easily run into the problem described below.
46 */
47#define XL_DEFAULT_MEM_BASE ((16+2)*1024*1024) /* 16M to 64M-1 is avail */
48
49/*
50 * APECS and LCA have only 34 bits for physical addresses, thus limiting PCI
51 * bus memory addresses for SPARSE access to be less than 128Mb.
52 */
53#define APECS_AND_LCA_DEFAULT_MEM_BASE ((16+2)*1024*1024)
54
55/*
56 * Because MCPCIA and T2 core logic support more bits for
57 * physical addresses, they should allow an expanded range of SPARSE
58 * memory addresses. However, we do not use them all, in order to
59 * avoid the HAE manipulation that would be needed.
60 */
61#define MCPCIA_DEFAULT_MEM_BASE ((32+2)*1024*1024)
62#define T2_DEFAULT_MEM_BASE ((16+1)*1024*1024)
63
64/*
65 * Because CIA and PYXIS have more bits for physical addresses,
66 * they support an expanded range of SPARSE memory addresses.
67 */
68#define DEFAULT_MEM_BASE ((128+16)*1024*1024)
69
70/* ??? Experimenting with no HAE for CIA. */
71#define CIA_DEFAULT_MEM_BASE ((32+2)*1024*1024)
72
73#define IRONGATE_DEFAULT_MEM_BASE ((256*8-16)*1024*1024)
74
75#define DEFAULT_AGP_APER_SIZE (64*1024*1024)
76
77/*
78 * A small note about bridges and interrupts. The DECchip 21050 (and
79 * later) adheres to the PCI-PCI bridge specification. This says that
80 * the interrupts on the other side of a bridge are swizzled in the
81 * following manner:
82 *
83 * Dev Interrupt Interrupt
84 * Pin on Pin on
85 * Device Connector
86 *
87 * 4 A A
88 * B B
89 * C C
90 * D D
91 *
92 * 5 A B
93 * B C
94 * C D
95 * D A
96 *
97 * 6 A C
98 * B D
99 * C A
100 * D B
101 *
102 * 7 A D
103 * B A
104 * C B
105 * D C
106 *
107 * Where A = pin 1, B = pin 2 and so on and pin=0 = default = A.
108 * Thus, each swizzle is ((pin-1) + (device#-4)) % 4
109 *
110 * pci_swizzle_interrupt_pin() swizzles for exactly one bridge. The routine
111 * pci_common_swizzle() handles multiple bridges. But there are a
112 * couple boards that do strange things.
113 */
114
115
116/* The following macro is used to implement the table-based irq mapping
117 function for all single-bus Alphas. */
118
119#define COMMON_TABLE_LOOKUP \
120({ long _ctl_ = -1; \
121 if (slot >= min_idsel && slot <= max_idsel && pin < irqs_per_slot) \
122 _ctl_ = irq_tab[slot - min_idsel][pin]; \
123 _ctl_; })
124
125
126/* A PCI IOMMU allocation arena. There are typically two of these
127 regions per bus. */
128/* ??? The 8400 has a 32-byte pte entry, and the entire table apparently
129 lives directly on the host bridge (no tlb?). We don't support this
130 machine, but if we ever did, we'd need to parameterize all this quite
131 a bit further. Probably with per-bus operation tables. */
132
133struct pci_iommu_arena
134{
135 spinlock_t lock;
136 struct pci_controller *hose;
137#define IOMMU_INVALID_PTE 0x2 /* 32:63 bits MBZ */
138#define IOMMU_RESERVED_PTE 0xface
139 unsigned long *ptes;
140 dma_addr_t dma_base;
141 unsigned int size;
142 unsigned int next_entry;
143 unsigned int align_entry;
144};
145
146#if defined(CONFIG_ALPHA_SRM) && defined(CONFIG_ALPHA_CIA)
147# define NEED_SRM_SAVE_RESTORE
148#else
149# undef NEED_SRM_SAVE_RESTORE
150#endif
151
152#if defined(CONFIG_ALPHA_GENERIC) || defined(NEED_SRM_SAVE_RESTORE)
153# define ALPHA_RESTORE_SRM_SETUP
154#else
155# undef ALPHA_RESTORE_SRM_SETUP
156#endif
157
158#ifdef ALPHA_RESTORE_SRM_SETUP
159extern void pci_restore_srm_config(void);
160#else
161#define pci_restore_srm_config() do {} while (0)
162#endif
163
164/* The hose list. */
165extern struct pci_controller *hose_head, **hose_tail;
166extern struct pci_controller *pci_isa_hose;
167
168extern unsigned long alpha_agpgart_size;
169
170extern void common_init_pci(void);
171#define common_swizzle pci_common_swizzle
172extern struct pci_controller *alloc_pci_controller(void);
173extern struct resource *alloc_resource(void);
174
175extern struct pci_iommu_arena *iommu_arena_new_node(int,
176 struct pci_controller *,
177 dma_addr_t, unsigned long,
178 unsigned long);
179extern struct pci_iommu_arena *iommu_arena_new(struct pci_controller *,
180 dma_addr_t, unsigned long,
181 unsigned long);
182extern const char *const pci_io_names[];
183extern const char *const pci_mem_names[];
184extern const char pci_hae0_name[];
185
186extern unsigned long size_for_memory(unsigned long max);
187
188extern int iommu_reserve(struct pci_iommu_arena *, long, long);
189extern int iommu_release(struct pci_iommu_arena *, long, long);
190extern int iommu_bind(struct pci_iommu_arena *, long, long, struct page **);
191extern int iommu_unbind(struct pci_iommu_arena *, long, long);
192
193