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-rw-r--r--arch/arm/mach-integrator/pci_v3.c46
1 files changed, 23 insertions, 23 deletions
diff --git a/arch/arm/mach-integrator/pci_v3.c b/arch/arm/mach-integrator/pci_v3.c
index 3a1305ba9ac9..495f181fc937 100644
--- a/arch/arm/mach-integrator/pci_v3.c
+++ b/arch/arm/mach-integrator/pci_v3.c
@@ -41,61 +41,61 @@
41/* 41/*
42 * The V3 PCI interface chip in Integrator provides several windows from 42 * The V3 PCI interface chip in Integrator provides several windows from
43 * local bus memory into the PCI memory areas. Unfortunately, there 43 * local bus memory into the PCI memory areas. Unfortunately, there
44 * are not really enough windows for our usage, therefore we reuse 44 * are not really enough windows for our usage, therefore we reuse
45 * one of the windows for access to PCI configuration space. The 45 * one of the windows for access to PCI configuration space. The
46 * memory map is as follows: 46 * memory map is as follows:
47 * 47 *
48 * Local Bus Memory Usage 48 * Local Bus Memory Usage
49 * 49 *
50 * 40000000 - 4FFFFFFF PCI memory. 256M non-prefetchable 50 * 40000000 - 4FFFFFFF PCI memory. 256M non-prefetchable
51 * 50000000 - 5FFFFFFF PCI memory. 256M prefetchable 51 * 50000000 - 5FFFFFFF PCI memory. 256M prefetchable
52 * 60000000 - 60FFFFFF PCI IO. 16M 52 * 60000000 - 60FFFFFF PCI IO. 16M
53 * 61000000 - 61FFFFFF PCI Configuration. 16M 53 * 61000000 - 61FFFFFF PCI Configuration. 16M
54 * 54 *
55 * There are three V3 windows, each described by a pair of V3 registers. 55 * There are three V3 windows, each described by a pair of V3 registers.
56 * These are LB_BASE0/LB_MAP0, LB_BASE1/LB_MAP1 and LB_BASE2/LB_MAP2. 56 * These are LB_BASE0/LB_MAP0, LB_BASE1/LB_MAP1 and LB_BASE2/LB_MAP2.
57 * Base0 and Base1 can be used for any type of PCI memory access. Base2 57 * Base0 and Base1 can be used for any type of PCI memory access. Base2
58 * can be used either for PCI I/O or for I20 accesses. By default, uHAL 58 * can be used either for PCI I/O or for I20 accesses. By default, uHAL
59 * uses this only for PCI IO space. 59 * uses this only for PCI IO space.
60 * 60 *
61 * Normally these spaces are mapped using the following base registers: 61 * Normally these spaces are mapped using the following base registers:
62 * 62 *
63 * Usage Local Bus Memory Base/Map registers used 63 * Usage Local Bus Memory Base/Map registers used
64 * 64 *
65 * Mem 40000000 - 4FFFFFFF LB_BASE0/LB_MAP0 65 * Mem 40000000 - 4FFFFFFF LB_BASE0/LB_MAP0
66 * Mem 50000000 - 5FFFFFFF LB_BASE1/LB_MAP1 66 * Mem 50000000 - 5FFFFFFF LB_BASE1/LB_MAP1
67 * IO 60000000 - 60FFFFFF LB_BASE2/LB_MAP2 67 * IO 60000000 - 60FFFFFF LB_BASE2/LB_MAP2
68 * Cfg 61000000 - 61FFFFFF 68 * Cfg 61000000 - 61FFFFFF
69 * 69 *
70 * This means that I20 and PCI configuration space accesses will fail. 70 * This means that I20 and PCI configuration space accesses will fail.
71 * When PCI configuration accesses are needed (via the uHAL PCI 71 * When PCI configuration accesses are needed (via the uHAL PCI
72 * configuration space primitives) we must remap the spaces as follows: 72 * configuration space primitives) we must remap the spaces as follows:
73 * 73 *
74 * Usage Local Bus Memory Base/Map registers used 74 * Usage Local Bus Memory Base/Map registers used
75 * 75 *
76 * Mem 40000000 - 4FFFFFFF LB_BASE0/LB_MAP0 76 * Mem 40000000 - 4FFFFFFF LB_BASE0/LB_MAP0
77 * Mem 50000000 - 5FFFFFFF LB_BASE0/LB_MAP0 77 * Mem 50000000 - 5FFFFFFF LB_BASE0/LB_MAP0
78 * IO 60000000 - 60FFFFFF LB_BASE2/LB_MAP2 78 * IO 60000000 - 60FFFFFF LB_BASE2/LB_MAP2
79 * Cfg 61000000 - 61FFFFFF LB_BASE1/LB_MAP1 79 * Cfg 61000000 - 61FFFFFF LB_BASE1/LB_MAP1
80 * 80 *
81 * To make this work, the code depends on overlapping windows working. 81 * To make this work, the code depends on overlapping windows working.
82 * The V3 chip translates an address by checking its range within 82 * The V3 chip translates an address by checking its range within
83 * each of the BASE/MAP pairs in turn (in ascending register number 83 * each of the BASE/MAP pairs in turn (in ascending register number
84 * order). It will use the first matching pair. So, for example, 84 * order). It will use the first matching pair. So, for example,
85 * if the same address is mapped by both LB_BASE0/LB_MAP0 and 85 * if the same address is mapped by both LB_BASE0/LB_MAP0 and
86 * LB_BASE1/LB_MAP1, the V3 will use the translation from 86 * LB_BASE1/LB_MAP1, the V3 will use the translation from
87 * LB_BASE0/LB_MAP0. 87 * LB_BASE0/LB_MAP0.
88 * 88 *
89 * To allow PCI Configuration space access, the code enlarges the 89 * To allow PCI Configuration space access, the code enlarges the
90 * window mapped by LB_BASE0/LB_MAP0 from 256M to 512M. This occludes 90 * window mapped by LB_BASE0/LB_MAP0 from 256M to 512M. This occludes
91 * the windows currently mapped by LB_BASE1/LB_MAP1 so that it can 91 * the windows currently mapped by LB_BASE1/LB_MAP1 so that it can
92 * be remapped for use by configuration cycles. 92 * be remapped for use by configuration cycles.
93 * 93 *
94 * At the end of the PCI Configuration space accesses, 94 * At the end of the PCI Configuration space accesses,
95 * LB_BASE1/LB_MAP1 is reset to map PCI Memory. Finally the window 95 * LB_BASE1/LB_MAP1 is reset to map PCI Memory. Finally the window
96 * mapped by LB_BASE0/LB_MAP0 is reduced in size from 512M to 256M to 96 * mapped by LB_BASE0/LB_MAP0 is reduced in size from 512M to 256M to
97 * reveal the now restored LB_BASE1/LB_MAP1 window. 97 * reveal the now restored LB_BASE1/LB_MAP1 window.
98 * 98 *
99 * NOTE: We do not set up I2O mapping. I suspect that this is only 99 * NOTE: We do not set up I2O mapping. I suspect that this is only
100 * for an intelligent (target) device. Using I2O disables most of 100 * for an intelligent (target) device. Using I2O disables most of
101 * the mappings into PCI memory. 101 * the mappings into PCI memory.
@@ -127,8 +127,8 @@
127 * 127 *
128 * returns: configuration address to play on the PCI bus 128 * returns: configuration address to play on the PCI bus
129 * 129 *
130 * To generate the appropriate PCI configuration cycles in the PCI 130 * To generate the appropriate PCI configuration cycles in the PCI
131 * configuration address space, you present the V3 with the following pattern 131 * configuration address space, you present the V3 with the following pattern
132 * (which is very nearly a type 1 (except that the lower two bits are 00 and 132 * (which is very nearly a type 1 (except that the lower two bits are 00 and
133 * not 01). In order for this mapping to work you need to set up one of 133 * not 01). In order for this mapping to work you need to set up one of
134 * the local to PCI aperatures to 16Mbytes in length translating to 134 * the local to PCI aperatures to 16Mbytes in length translating to
@@ -138,7 +138,7 @@
138 * 138 *
139 * Type 0: 139 * Type 0:
140 * 140 *
141 * 3 3|3 3 2 2|2 2 2 2|2 2 2 2|1 1 1 1|1 1 1 1|1 1 141 * 3 3|3 3 2 2|2 2 2 2|2 2 2 2|1 1 1 1|1 1 1 1|1 1
142 * 3 2|1 0 9 8|7 6 5 4|3 2 1 0|9 8 7 6|5 4 3 2|1 0 9 8|7 6 5 4|3 2 1 0 142 * 3 2|1 0 9 8|7 6 5 4|3 2 1 0|9 8 7 6|5 4 3 2|1 0 9 8|7 6 5 4|3 2 1 0
143 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 143 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
144 * | | |D|D|D|D|D|D|D|D|D|D|D|D|D|D|D|D|D|D|D|D|D|F|F|F|R|R|R|R|R|R|0|0| 144 * | | |D|D|D|D|D|D|D|D|D|D|D|D|D|D|D|D|D|D|D|D|D|F|F|F|R|R|R|R|R|R|0|0|
@@ -150,7 +150,7 @@
150 * 150 *
151 * Type 1: 151 * Type 1:
152 * 152 *
153 * 3 3|3 3 2 2|2 2 2 2|2 2 2 2|1 1 1 1|1 1 1 1|1 1 153 * 3 3|3 3 2 2|2 2 2 2|2 2 2 2|1 1 1 1|1 1 1 1|1 1
154 * 3 2|1 0 9 8|7 6 5 4|3 2 1 0|9 8 7 6|5 4 3 2|1 0 9 8|7 6 5 4|3 2 1 0 154 * 3 2|1 0 9 8|7 6 5 4|3 2 1 0|9 8 7 6|5 4 3 2|1 0 9 8|7 6 5 4|3 2 1 0
155 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 155 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
156 * | | | | | | | | | | |B|B|B|B|B|B|B|B|D|D|D|D|D|F|F|F|R|R|R|R|R|R|0|1| 156 * | | | | | | | | | | |B|B|B|B|B|B|B|B|D|D|D|D|D|F|F|F|R|R|R|R|R|R|0|1|
@@ -161,7 +161,7 @@
161 * 15:11 Device number (5 bits) 161 * 15:11 Device number (5 bits)
162 * 10:8 function number 162 * 10:8 function number
163 * 7:2 register number 163 * 7:2 register number
164 * 164 *
165 */ 165 */
166static DEFINE_RAW_SPINLOCK(v3_lock); 166static DEFINE_RAW_SPINLOCK(v3_lock);
167 167