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authorLinus Torvalds <torvalds@ppc970.osdl.org>2005-04-16 18:20:36 -0400
committerLinus Torvalds <torvalds@ppc970.osdl.org>2005-04-16 18:20:36 -0400
commit1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 (patch)
tree0bba044c4ce775e45a88a51686b5d9f90697ea9d /arch/frv/mb93090-mb00
Linux-2.6.12-rc2v2.6.12-rc2
Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
Diffstat (limited to 'arch/frv/mb93090-mb00')
-rw-r--r--arch/frv/mb93090-mb00/Makefile13
-rw-r--r--arch/frv/mb93090-mb00/pci-dma-nommu.c152
-rw-r--r--arch/frv/mb93090-mb00/pci-dma.c105
-rw-r--r--arch/frv/mb93090-mb00/pci-frv.c288
-rw-r--r--arch/frv/mb93090-mb00/pci-frv.h47
-rw-r--r--arch/frv/mb93090-mb00/pci-irq.c70
-rw-r--r--arch/frv/mb93090-mb00/pci-vdk.c467
7 files changed, 1142 insertions, 0 deletions
diff --git a/arch/frv/mb93090-mb00/Makefile b/arch/frv/mb93090-mb00/Makefile
new file mode 100644
index 000000000000..3faf0f8cf9b5
--- /dev/null
+++ b/arch/frv/mb93090-mb00/Makefile
@@ -0,0 +1,13 @@
1#
2# Makefile for the MB93090-MB00 motherboard stuff
3#
4
5ifeq "$(CONFIG_PCI)" "y"
6obj-y := pci-frv.o pci-irq.o pci-vdk.o
7
8ifeq "$(CONFIG_MMU)" "y"
9obj-y += pci-dma.o
10else
11obj-y += pci-dma-nommu.o
12endif
13endif
diff --git a/arch/frv/mb93090-mb00/pci-dma-nommu.c b/arch/frv/mb93090-mb00/pci-dma-nommu.c
new file mode 100644
index 000000000000..819895cf0b9e
--- /dev/null
+++ b/arch/frv/mb93090-mb00/pci-dma-nommu.c
@@ -0,0 +1,152 @@
1/* pci-dma-nommu.c: Dynamic DMA mapping support for the FRV
2 *
3 * Copyright (C) 2004 Red Hat, Inc. All Rights Reserved.
4 * Written by David Woodhouse (dwmw2@redhat.com)
5 *
6 * This program is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU General Public License
8 * as published by the Free Software Foundation; either version
9 * 2 of the License, or (at your option) any later version.
10 */
11
12#include <linux/types.h>
13#include <linux/slab.h>
14#include <linux/dma-mapping.h>
15#include <linux/list.h>
16#include <linux/pci.h>
17#include <asm/io.h>
18
19#if 1
20#define DMA_SRAM_START dma_coherent_mem_start
21#define DMA_SRAM_END dma_coherent_mem_end
22#else // Use video RAM on Matrox
23#define DMA_SRAM_START 0xe8900000
24#define DMA_SRAM_END 0xe8a00000
25#endif
26
27struct dma_alloc_record {
28 struct list_head list;
29 unsigned long ofs;
30 unsigned long len;
31};
32
33static DEFINE_SPINLOCK(dma_alloc_lock);
34static LIST_HEAD(dma_alloc_list);
35
36void *dma_alloc_coherent(struct device *hwdev, size_t size, dma_addr_t *dma_handle, int gfp)
37{
38 struct dma_alloc_record *new;
39 struct list_head *this = &dma_alloc_list;
40 unsigned long flags;
41 unsigned long start = DMA_SRAM_START;
42 unsigned long end;
43
44 if (!DMA_SRAM_START) {
45 printk("%s called without any DMA area reserved!\n", __func__);
46 return NULL;
47 }
48
49 new = kmalloc(sizeof (*new), GFP_ATOMIC);
50 if (!new)
51 return NULL;
52
53 /* Round up to a reasonable alignment */
54 new->len = (size + 31) & ~31;
55
56 spin_lock_irqsave(&dma_alloc_lock, flags);
57
58 list_for_each (this, &dma_alloc_list) {
59 struct dma_alloc_record *this_r = list_entry(this, struct dma_alloc_record, list);
60 end = this_r->ofs;
61
62 if (end - start >= size)
63 goto gotone;
64
65 start = this_r->ofs + this_r->len;
66 }
67 /* Reached end of list. */
68 end = DMA_SRAM_END;
69 this = &dma_alloc_list;
70
71 if (end - start >= size) {
72 gotone:
73 new->ofs = start;
74 list_add_tail(&new->list, this);
75 spin_unlock_irqrestore(&dma_alloc_lock, flags);
76
77 *dma_handle = start;
78 return (void *)start;
79 }
80
81 kfree(new);
82 spin_unlock_irqrestore(&dma_alloc_lock, flags);
83 return NULL;
84}
85
86void dma_free_coherent(struct device *hwdev, size_t size, void *vaddr, dma_addr_t dma_handle)
87{
88 struct dma_alloc_record *rec;
89 unsigned long flags;
90
91 spin_lock_irqsave(&dma_alloc_lock, flags);
92
93 list_for_each_entry(rec, &dma_alloc_list, list) {
94 if (rec->ofs == dma_handle) {
95 list_del(&rec->list);
96 kfree(rec);
97 spin_unlock_irqrestore(&dma_alloc_lock, flags);
98 return;
99 }
100 }
101 spin_unlock_irqrestore(&dma_alloc_lock, flags);
102 BUG();
103}
104
105/*
106 * Map a single buffer of the indicated size for DMA in streaming mode.
107 * The 32-bit bus address to use is returned.
108 *
109 * Once the device is given the dma address, the device owns this memory
110 * until either pci_unmap_single or pci_dma_sync_single is performed.
111 */
112dma_addr_t dma_map_single(struct device *dev, void *ptr, size_t size,
113 enum dma_data_direction direction)
114{
115 if (direction == DMA_NONE)
116 BUG();
117
118 frv_cache_wback_inv((unsigned long) ptr, (unsigned long) ptr + size);
119
120 return virt_to_bus(ptr);
121}
122
123/*
124 * Map a set of buffers described by scatterlist in streaming
125 * mode for DMA. This is the scather-gather version of the
126 * above pci_map_single interface. Here the scatter gather list
127 * elements are each tagged with the appropriate dma address
128 * and length. They are obtained via sg_dma_{address,length}(SG).
129 *
130 * NOTE: An implementation may be able to use a smaller number of
131 * DMA address/length pairs than there are SG table elements.
132 * (for example via virtual mapping capabilities)
133 * The routine returns the number of addr/length pairs actually
134 * used, at most nents.
135 *
136 * Device ownership issues as mentioned above for pci_map_single are
137 * the same here.
138 */
139int dma_map_sg(struct device *dev, struct scatterlist *sg, int nents,
140 enum dma_data_direction direction)
141{
142 int i;
143
144 for (i=0; i<nents; i++)
145 frv_cache_wback_inv(sg_dma_address(&sg[i]),
146 sg_dma_address(&sg[i]) + sg_dma_len(&sg[i]));
147
148 if (direction == DMA_NONE)
149 BUG();
150
151 return nents;
152}
diff --git a/arch/frv/mb93090-mb00/pci-dma.c b/arch/frv/mb93090-mb00/pci-dma.c
new file mode 100644
index 000000000000..27eb12066507
--- /dev/null
+++ b/arch/frv/mb93090-mb00/pci-dma.c
@@ -0,0 +1,105 @@
1/* pci-dma.c: Dynamic DMA mapping support for the FRV CPUs that have MMUs
2 *
3 * Copyright (C) 2004 Red Hat, Inc. All Rights Reserved.
4 * Written by David Howells (dhowells@redhat.com)
5 *
6 * This program is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU General Public License
8 * as published by the Free Software Foundation; either version
9 * 2 of the License, or (at your option) any later version.
10 */
11
12#include <linux/types.h>
13#include <linux/slab.h>
14#include <linux/dma-mapping.h>
15#include <linux/list.h>
16#include <linux/pci.h>
17#include <linux/highmem.h>
18#include <asm/io.h>
19
20void *dma_alloc_coherent(struct device *hwdev, size_t size, dma_addr_t *dma_handle, int gfp)
21{
22 void *ret;
23
24 ret = consistent_alloc(gfp, size, dma_handle);
25 if (ret)
26 memset(ret, 0, size);
27
28 return ret;
29}
30
31void dma_free_coherent(struct device *hwdev, size_t size, void *vaddr, dma_addr_t dma_handle)
32{
33 consistent_free(vaddr);
34}
35
36/*
37 * Map a single buffer of the indicated size for DMA in streaming mode.
38 * The 32-bit bus address to use is returned.
39 *
40 * Once the device is given the dma address, the device owns this memory
41 * until either pci_unmap_single or pci_dma_sync_single is performed.
42 */
43dma_addr_t dma_map_single(struct device *dev, void *ptr, size_t size,
44 enum dma_data_direction direction)
45{
46 if (direction == DMA_NONE)
47 BUG();
48
49 frv_cache_wback_inv((unsigned long) ptr, (unsigned long) ptr + size);
50
51 return virt_to_bus(ptr);
52}
53
54/*
55 * Map a set of buffers described by scatterlist in streaming
56 * mode for DMA. This is the scather-gather version of the
57 * above pci_map_single interface. Here the scatter gather list
58 * elements are each tagged with the appropriate dma address
59 * and length. They are obtained via sg_dma_{address,length}(SG).
60 *
61 * NOTE: An implementation may be able to use a smaller number of
62 * DMA address/length pairs than there are SG table elements.
63 * (for example via virtual mapping capabilities)
64 * The routine returns the number of addr/length pairs actually
65 * used, at most nents.
66 *
67 * Device ownership issues as mentioned above for pci_map_single are
68 * the same here.
69 */
70int dma_map_sg(struct device *dev, struct scatterlist *sg, int nents,
71 enum dma_data_direction direction)
72{
73 unsigned long dampr2;
74 void *vaddr;
75 int i;
76
77 if (direction == DMA_NONE)
78 BUG();
79
80 dampr2 = __get_DAMPR(2);
81
82 for (i = 0; i < nents; i++) {
83 vaddr = kmap_atomic(sg[i].page, __KM_CACHE);
84
85 frv_dcache_writeback((unsigned long) vaddr,
86 (unsigned long) vaddr + PAGE_SIZE);
87
88 }
89
90 kunmap_atomic(vaddr, __KM_CACHE);
91 if (dampr2) {
92 __set_DAMPR(2, dampr2);
93 __set_IAMPR(2, dampr2);
94 }
95
96 return nents;
97}
98
99dma_addr_t dma_map_page(struct device *dev, struct page *page, unsigned long offset,
100 size_t size, enum dma_data_direction direction)
101{
102 BUG_ON(direction == DMA_NONE);
103 flush_dcache_page(page);
104 return (dma_addr_t) page_to_phys(page) + offset;
105}
diff --git a/arch/frv/mb93090-mb00/pci-frv.c b/arch/frv/mb93090-mb00/pci-frv.c
new file mode 100644
index 000000000000..83e5489cf039
--- /dev/null
+++ b/arch/frv/mb93090-mb00/pci-frv.c
@@ -0,0 +1,288 @@
1/* pci-frv.c: low-level PCI access routines
2 *
3 * Copyright (C) 2003-5 Red Hat, Inc. All Rights Reserved.
4 * Written by David Howells (dhowells@redhat.com)
5 * - Derived from the i386 equivalent stuff
6 *
7 * This program is free software; you can redistribute it and/or
8 * modify it under the terms of the GNU General Public License
9 * as published by the Free Software Foundation; either version
10 * 2 of the License, or (at your option) any later version.
11 */
12
13#include <linux/types.h>
14#include <linux/kernel.h>
15#include <linux/pci.h>
16#include <linux/init.h>
17#include <linux/ioport.h>
18#include <linux/errno.h>
19
20#include "pci-frv.h"
21
22#if 0
23void
24pcibios_update_resource(struct pci_dev *dev, struct resource *root,
25 struct resource *res, int resource)
26{
27 u32 new, check;
28 int reg;
29
30 new = res->start | (res->flags & PCI_REGION_FLAG_MASK);
31 if (resource < 6) {
32 reg = PCI_BASE_ADDRESS_0 + 4*resource;
33 } else if (resource == PCI_ROM_RESOURCE) {
34 res->flags |= IORESOURCE_ROM_ENABLE;
35 new |= PCI_ROM_ADDRESS_ENABLE;
36 reg = dev->rom_base_reg;
37 } else {
38 /* Somebody might have asked allocation of a non-standard resource */
39 return;
40 }
41
42 pci_write_config_dword(dev, reg, new);
43 pci_read_config_dword(dev, reg, &check);
44 if ((new ^ check) & ((new & PCI_BASE_ADDRESS_SPACE_IO) ? PCI_BASE_ADDRESS_IO_MASK : PCI_BASE_ADDRESS_MEM_MASK)) {
45 printk(KERN_ERR "PCI: Error while updating region "
46 "%s/%d (%08x != %08x)\n", pci_name(dev), resource,
47 new, check);
48 }
49}
50#endif
51
52/*
53 * We need to avoid collisions with `mirrored' VGA ports
54 * and other strange ISA hardware, so we always want the
55 * addresses to be allocated in the 0x000-0x0ff region
56 * modulo 0x400.
57 *
58 * Why? Because some silly external IO cards only decode
59 * the low 10 bits of the IO address. The 0x00-0xff region
60 * is reserved for motherboard devices that decode all 16
61 * bits, so it's ok to allocate at, say, 0x2800-0x28ff,
62 * but we want to try to avoid allocating at 0x2900-0x2bff
63 * which might have be mirrored at 0x0100-0x03ff..
64 */
65void
66pcibios_align_resource(void *data, struct resource *res,
67 unsigned long size, unsigned long align)
68{
69 if (res->flags & IORESOURCE_IO) {
70 unsigned long start = res->start;
71
72 if (start & 0x300) {
73 start = (start + 0x3ff) & ~0x3ff;
74 res->start = start;
75 }
76 }
77}
78
79
80/*
81 * Handle resources of PCI devices. If the world were perfect, we could
82 * just allocate all the resource regions and do nothing more. It isn't.
83 * On the other hand, we cannot just re-allocate all devices, as it would
84 * require us to know lots of host bridge internals. So we attempt to
85 * keep as much of the original configuration as possible, but tweak it
86 * when it's found to be wrong.
87 *
88 * Known BIOS problems we have to work around:
89 * - I/O or memory regions not configured
90 * - regions configured, but not enabled in the command register
91 * - bogus I/O addresses above 64K used
92 * - expansion ROMs left enabled (this may sound harmless, but given
93 * the fact the PCI specs explicitly allow address decoders to be
94 * shared between expansion ROMs and other resource regions, it's
95 * at least dangerous)
96 *
97 * Our solution:
98 * (1) Allocate resources for all buses behind PCI-to-PCI bridges.
99 * This gives us fixed barriers on where we can allocate.
100 * (2) Allocate resources for all enabled devices. If there is
101 * a collision, just mark the resource as unallocated. Also
102 * disable expansion ROMs during this step.
103 * (3) Try to allocate resources for disabled devices. If the
104 * resources were assigned correctly, everything goes well,
105 * if they weren't, they won't disturb allocation of other
106 * resources.
107 * (4) Assign new addresses to resources which were either
108 * not configured at all or misconfigured. If explicitly
109 * requested by the user, configure expansion ROM address
110 * as well.
111 */
112
113static void __init pcibios_allocate_bus_resources(struct list_head *bus_list)
114{
115 struct list_head *ln;
116 struct pci_bus *bus;
117 struct pci_dev *dev;
118 int idx;
119 struct resource *r, *pr;
120
121 /* Depth-First Search on bus tree */
122 for (ln=bus_list->next; ln != bus_list; ln=ln->next) {
123 bus = pci_bus_b(ln);
124 if ((dev = bus->self)) {
125 for (idx = PCI_BRIDGE_RESOURCES; idx < PCI_NUM_RESOURCES; idx++) {
126 r = &dev->resource[idx];
127 if (!r->start)
128 continue;
129 pr = pci_find_parent_resource(dev, r);
130 if (!pr || request_resource(pr, r) < 0)
131 printk(KERN_ERR "PCI: Cannot allocate resource region %d of bridge %s\n", idx, pci_name(dev));
132 }
133 }
134 pcibios_allocate_bus_resources(&bus->children);
135 }
136}
137
138static void __init pcibios_allocate_resources(int pass)
139{
140 struct pci_dev *dev = NULL;
141 int idx, disabled;
142 u16 command;
143 struct resource *r, *pr;
144
145 while (dev = pci_find_device(PCI_ANY_ID, PCI_ANY_ID, dev),
146 dev != NULL
147 ) {
148 pci_read_config_word(dev, PCI_COMMAND, &command);
149 for(idx = 0; idx < 6; idx++) {
150 r = &dev->resource[idx];
151 if (r->parent) /* Already allocated */
152 continue;
153 if (!r->start) /* Address not assigned at all */
154 continue;
155 if (r->flags & IORESOURCE_IO)
156 disabled = !(command & PCI_COMMAND_IO);
157 else
158 disabled = !(command & PCI_COMMAND_MEMORY);
159 if (pass == disabled) {
160 DBG("PCI: Resource %08lx-%08lx (f=%lx, d=%d, p=%d)\n",
161 r->start, r->end, r->flags, disabled, pass);
162 pr = pci_find_parent_resource(dev, r);
163 if (!pr || request_resource(pr, r) < 0) {
164 printk(KERN_ERR "PCI: Cannot allocate resource region %d of device %s\n", idx, pci_name(dev));
165 /* We'll assign a new address later */
166 r->end -= r->start;
167 r->start = 0;
168 }
169 }
170 }
171 if (!pass) {
172 r = &dev->resource[PCI_ROM_RESOURCE];
173 if (r->flags & IORESOURCE_ROM_ENABLE) {
174 /* Turn the ROM off, leave the resource region, but keep it unregistered. */
175 u32 reg;
176 DBG("PCI: Switching off ROM of %s\n", pci_name(dev));
177 r->flags &= ~IORESOURCE_ROM_ENABLE;
178 pci_read_config_dword(dev, dev->rom_base_reg, &reg);
179 pci_write_config_dword(dev, dev->rom_base_reg, reg & ~PCI_ROM_ADDRESS_ENABLE);
180 }
181 }
182 }
183}
184
185static void __init pcibios_assign_resources(void)
186{
187 struct pci_dev *dev = NULL;
188 int idx;
189 struct resource *r;
190
191 while (dev = pci_find_device(PCI_ANY_ID, PCI_ANY_ID, dev),
192 dev != NULL
193 ) {
194 int class = dev->class >> 8;
195
196 /* Don't touch classless devices and host bridges */
197 if (!class || class == PCI_CLASS_BRIDGE_HOST)
198 continue;
199
200 for(idx=0; idx<6; idx++) {
201 r = &dev->resource[idx];
202
203 /*
204 * Don't touch IDE controllers and I/O ports of video cards!
205 */
206 if ((class == PCI_CLASS_STORAGE_IDE && idx < 4) ||
207 (class == PCI_CLASS_DISPLAY_VGA && (r->flags & IORESOURCE_IO)))
208 continue;
209
210 /*
211 * We shall assign a new address to this resource, either because
212 * the BIOS forgot to do so or because we have decided the old
213 * address was unusable for some reason.
214 */
215 if (!r->start && r->end)
216 pci_assign_resource(dev, idx);
217 }
218
219 if (pci_probe & PCI_ASSIGN_ROMS) {
220 r = &dev->resource[PCI_ROM_RESOURCE];
221 r->end -= r->start;
222 r->start = 0;
223 if (r->end)
224 pci_assign_resource(dev, PCI_ROM_RESOURCE);
225 }
226 }
227}
228
229void __init pcibios_resource_survey(void)
230{
231 DBG("PCI: Allocating resources\n");
232 pcibios_allocate_bus_resources(&pci_root_buses);
233 pcibios_allocate_resources(0);
234 pcibios_allocate_resources(1);
235 pcibios_assign_resources();
236}
237
238int pcibios_enable_resources(struct pci_dev *dev, int mask)
239{
240 u16 cmd, old_cmd;
241 int idx;
242 struct resource *r;
243
244 pci_read_config_word(dev, PCI_COMMAND, &cmd);
245 old_cmd = cmd;
246 for(idx=0; idx<6; idx++) {
247 /* Only set up the requested stuff */
248 if (!(mask & (1<<idx)))
249 continue;
250
251 r = &dev->resource[idx];
252 if (!r->start && r->end) {
253 printk(KERN_ERR "PCI: Device %s not available because of resource collisions\n", pci_name(dev));
254 return -EINVAL;
255 }
256 if (r->flags & IORESOURCE_IO)
257 cmd |= PCI_COMMAND_IO;
258 if (r->flags & IORESOURCE_MEM)
259 cmd |= PCI_COMMAND_MEMORY;
260 }
261 if (dev->resource[PCI_ROM_RESOURCE].start)
262 cmd |= PCI_COMMAND_MEMORY;
263 if (cmd != old_cmd) {
264 printk("PCI: Enabling device %s (%04x -> %04x)\n", pci_name(dev), old_cmd, cmd);
265 pci_write_config_word(dev, PCI_COMMAND, cmd);
266 }
267 return 0;
268}
269
270/*
271 * If we set up a device for bus mastering, we need to check the latency
272 * timer as certain crappy BIOSes forget to set it properly.
273 */
274unsigned int pcibios_max_latency = 255;
275
276void pcibios_set_master(struct pci_dev *dev)
277{
278 u8 lat;
279 pci_read_config_byte(dev, PCI_LATENCY_TIMER, &lat);
280 if (lat < 16)
281 lat = (64 <= pcibios_max_latency) ? 64 : pcibios_max_latency;
282 else if (lat > pcibios_max_latency)
283 lat = pcibios_max_latency;
284 else
285 return;
286 printk(KERN_DEBUG "PCI: Setting latency timer of device %s to %d\n", pci_name(dev), lat);
287 pci_write_config_byte(dev, PCI_LATENCY_TIMER, lat);
288}
diff --git a/arch/frv/mb93090-mb00/pci-frv.h b/arch/frv/mb93090-mb00/pci-frv.h
new file mode 100644
index 000000000000..7481797ab382
--- /dev/null
+++ b/arch/frv/mb93090-mb00/pci-frv.h
@@ -0,0 +1,47 @@
1/*
2 * Low-Level PCI Access for FRV machines.
3 *
4 * (c) 1999 Martin Mares <mj@ucw.cz>
5 */
6
7#include <asm/sections.h>
8
9#undef DEBUG
10
11#ifdef DEBUG
12#define DBG(x...) printk(x)
13#else
14#define DBG(x...)
15#endif
16
17#define PCI_PROBE_BIOS 0x0001
18#define PCI_PROBE_CONF1 0x0002
19#define PCI_PROBE_CONF2 0x0004
20#define PCI_NO_SORT 0x0100
21#define PCI_BIOS_SORT 0x0200
22#define PCI_NO_CHECKS 0x0400
23#define PCI_ASSIGN_ROMS 0x1000
24#define PCI_BIOS_IRQ_SCAN 0x2000
25#define PCI_ASSIGN_ALL_BUSSES 0x4000
26
27extern unsigned int __nongpreldata pci_probe;
28
29/* pci-frv.c */
30
31extern unsigned int pcibios_max_latency;
32
33void pcibios_resource_survey(void);
34int pcibios_enable_resources(struct pci_dev *, int);
35
36/* pci-vdk.c */
37
38extern int __nongpreldata pcibios_last_bus;
39extern struct pci_bus *__nongpreldata pci_root_bus;
40extern struct pci_ops *__nongpreldata pci_root_ops;
41
42/* pci-irq.c */
43extern unsigned int pcibios_irq_mask;
44
45void pcibios_irq_init(void);
46void pcibios_fixup_irqs(void);
47void pcibios_enable_irq(struct pci_dev *dev);
diff --git a/arch/frv/mb93090-mb00/pci-irq.c b/arch/frv/mb93090-mb00/pci-irq.c
new file mode 100644
index 000000000000..24622d89b1ca
--- /dev/null
+++ b/arch/frv/mb93090-mb00/pci-irq.c
@@ -0,0 +1,70 @@
1/* pci-irq.c: PCI IRQ routing on the FRV motherboard
2 *
3 * Copyright (C) 2003 Red Hat, Inc. All Rights Reserved.
4 * Written by David Howells (dhowells@redhat.com)
5 * derived from: arch/i386/kernel/pci-irq.c: (c) 1999--2000 Martin Mares <mj@suse.cz>
6 */
7
8#include <linux/config.h>
9#include <linux/types.h>
10#include <linux/kernel.h>
11#include <linux/pci.h>
12#include <linux/init.h>
13#include <linux/slab.h>
14#include <linux/interrupt.h>
15#include <linux/irq.h>
16
17#include <asm/io.h>
18#include <asm/smp.h>
19#include <asm/irq-routing.h>
20
21#include "pci-frv.h"
22
23/*
24 * DEVICE DEVNO INT#A INT#B INT#C INT#D
25 * ======= ======= ======= ======= ======= =======
26 * MB86943 0 fpga.10 - - -
27 * RTL8029 16 fpga.12 - - -
28 * SLOT 1 19 fpga.6 fpga.5 fpga.4 fpga.3
29 * SLOT 2 18 fpga.5 fpga.4 fpga.3 fpga.6
30 * SLOT 3 17 fpga.4 fpga.3 fpga.6 fpga.5
31 *
32 */
33
34static const uint8_t __initdata pci_bus0_irq_routing[32][4] = {
35 [0 ] { IRQ_FPGA_MB86943_PCI_INTA },
36 [16] { IRQ_FPGA_RTL8029_INTA },
37 [17] { IRQ_FPGA_PCI_INTC, IRQ_FPGA_PCI_INTD, IRQ_FPGA_PCI_INTA, IRQ_FPGA_PCI_INTB },
38 [18] { IRQ_FPGA_PCI_INTB, IRQ_FPGA_PCI_INTC, IRQ_FPGA_PCI_INTD, IRQ_FPGA_PCI_INTA },
39 [19] { IRQ_FPGA_PCI_INTA, IRQ_FPGA_PCI_INTB, IRQ_FPGA_PCI_INTC, IRQ_FPGA_PCI_INTD },
40};
41
42void __init pcibios_irq_init(void)
43{
44}
45
46void __init pcibios_fixup_irqs(void)
47{
48 struct pci_dev *dev = NULL;
49 uint8_t line, pin;
50
51 while (dev = pci_find_device(PCI_ANY_ID, PCI_ANY_ID, dev),
52 dev != NULL
53 ) {
54 pci_read_config_byte(dev, PCI_INTERRUPT_PIN, &pin);
55 if (pin) {
56 dev->irq = pci_bus0_irq_routing[PCI_SLOT(dev->devfn)][pin - 1];
57 pci_write_config_byte(dev, PCI_INTERRUPT_LINE, dev->irq);
58 }
59 pci_read_config_byte(dev, PCI_INTERRUPT_LINE, &line);
60 }
61}
62
63void __init pcibios_penalize_isa_irq(int irq)
64{
65}
66
67void pcibios_enable_irq(struct pci_dev *dev)
68{
69 pci_write_config_byte(dev, PCI_INTERRUPT_LINE, dev->irq);
70}
diff --git a/arch/frv/mb93090-mb00/pci-vdk.c b/arch/frv/mb93090-mb00/pci-vdk.c
new file mode 100644
index 000000000000..c8817f7b8605
--- /dev/null
+++ b/arch/frv/mb93090-mb00/pci-vdk.c
@@ -0,0 +1,467 @@
1/* pci-vdk.c: MB93090-MB00 (VDK) PCI support
2 *
3 * Copyright (C) 2003, 2004 Red Hat, Inc. All Rights Reserved.
4 * Written by David Howells (dhowells@redhat.com)
5 *
6 * This program is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU General Public License
8 * as published by the Free Software Foundation; either version
9 * 2 of the License, or (at your option) any later version.
10 */
11
12#include <linux/config.h>
13#include <linux/types.h>
14#include <linux/kernel.h>
15#include <linux/sched.h>
16#include <linux/pci.h>
17#include <linux/init.h>
18#include <linux/ioport.h>
19#include <linux/delay.h>
20#include <linux/slab.h>
21
22#include <asm/segment.h>
23#include <asm/io.h>
24#include <asm/mb-regs.h>
25#include <asm/mb86943a.h>
26#include "pci-frv.h"
27
28unsigned int __nongpreldata pci_probe = 1;
29
30int __nongpreldata pcibios_last_bus = -1;
31struct pci_bus *__nongpreldata pci_root_bus;
32struct pci_ops *__nongpreldata pci_root_ops;
33
34/*
35 * Functions for accessing PCI configuration space
36 */
37
38#define CONFIG_CMD(bus, dev, where) \
39 (0x80000000 | (bus->number << 16) | (devfn << 8) | (where & ~3))
40
41#define __set_PciCfgAddr(A) writel((A), (volatile void __iomem *) __region_CS1 + 0x80)
42
43#define __get_PciCfgDataB(A) readb((volatile void __iomem *) __region_CS1 + 0x88 + ((A) & 3))
44#define __get_PciCfgDataW(A) readw((volatile void __iomem *) __region_CS1 + 0x88 + ((A) & 2))
45#define __get_PciCfgDataL(A) readl((volatile void __iomem *) __region_CS1 + 0x88)
46
47#define __set_PciCfgDataB(A,V) \
48 writeb((V), (volatile void __iomem *) __region_CS1 + 0x88 + (3 - ((A) & 3)))
49
50#define __set_PciCfgDataW(A,V) \
51 writew((V), (volatile void __iomem *) __region_CS1 + 0x88 + (2 - ((A) & 2)))
52
53#define __set_PciCfgDataL(A,V) \
54 writel((V), (volatile void __iomem *) __region_CS1 + 0x88)
55
56#define __get_PciBridgeDataB(A) readb((volatile void __iomem *) __region_CS1 + 0x800 + (A))
57#define __get_PciBridgeDataW(A) readw((volatile void __iomem *) __region_CS1 + 0x800 + (A))
58#define __get_PciBridgeDataL(A) readl((volatile void __iomem *) __region_CS1 + 0x800 + (A))
59
60#define __set_PciBridgeDataB(A,V) writeb((V), (volatile void __iomem *) __region_CS1 + 0x800 + (A))
61#define __set_PciBridgeDataW(A,V) writew((V), (volatile void __iomem *) __region_CS1 + 0x800 + (A))
62#define __set_PciBridgeDataL(A,V) writel((V), (volatile void __iomem *) __region_CS1 + 0x800 + (A))
63
64static inline int __query(const struct pci_dev *dev)
65{
66// return dev->bus->number==0 && (dev->devfn==PCI_DEVFN(0,0));
67// return dev->bus->number==1;
68// return dev->bus->number==0 &&
69// (dev->devfn==PCI_DEVFN(2,0) || dev->devfn==PCI_DEVFN(3,0));
70 return 0;
71}
72
73/*****************************************************************************/
74/*
75 *
76 */
77static int pci_frv_read_config(struct pci_bus *bus, unsigned int devfn, int where, int size,
78 u32 *val)
79{
80 u32 _value;
81
82 if (bus->number == 0 && devfn == PCI_DEVFN(0, 0)) {
83 _value = __get_PciBridgeDataL(where & ~3);
84 }
85 else {
86 __set_PciCfgAddr(CONFIG_CMD(bus, devfn, where));
87 _value = __get_PciCfgDataL(where & ~3);
88 }
89
90 switch (size) {
91 case 1:
92 _value = _value >> ((where & 3) * 8);
93 break;
94
95 case 2:
96 _value = _value >> ((where & 2) * 8);
97 break;
98
99 case 4:
100 break;
101
102 default:
103 BUG();
104 }
105
106 *val = _value;
107 return PCIBIOS_SUCCESSFUL;
108}
109
110static int pci_frv_write_config(struct pci_bus *bus, unsigned int devfn, int where, int size,
111 u32 value)
112{
113 switch (size) {
114 case 1:
115 if (bus->number == 0 && devfn == PCI_DEVFN(0, 0)) {
116 __set_PciBridgeDataB(where, value);
117 }
118 else {
119 __set_PciCfgAddr(CONFIG_CMD(bus, devfn, where));
120 __set_PciCfgDataB(where, value);
121 }
122 break;
123
124 case 2:
125 if (bus->number == 0 && devfn == PCI_DEVFN(0, 0)) {
126 __set_PciBridgeDataW(where, value);
127 }
128 else {
129 __set_PciCfgAddr(CONFIG_CMD(bus, devfn, where));
130 __set_PciCfgDataW(where, value);
131 }
132 break;
133
134 case 4:
135 if (bus->number == 0 && devfn == PCI_DEVFN(0, 0)) {
136 __set_PciBridgeDataL(where, value);
137 }
138 else {
139 __set_PciCfgAddr(CONFIG_CMD(bus, devfn, where));
140 __set_PciCfgDataL(where, value);
141 }
142 break;
143
144 default:
145 BUG();
146 }
147
148 return PCIBIOS_SUCCESSFUL;
149}
150
151static struct pci_ops pci_direct_frv = {
152 pci_frv_read_config,
153 pci_frv_write_config,
154};
155
156/*
157 * Before we decide to use direct hardware access mechanisms, we try to do some
158 * trivial checks to ensure it at least _seems_ to be working -- we just test
159 * whether bus 00 contains a host bridge (this is similar to checking
160 * techniques used in XFree86, but ours should be more reliable since we
161 * attempt to make use of direct access hints provided by the PCI BIOS).
162 *
163 * This should be close to trivial, but it isn't, because there are buggy
164 * chipsets (yes, you guessed it, by Intel and Compaq) that have no class ID.
165 */
166static int __init pci_sanity_check(struct pci_ops *o)
167{
168 struct pci_bus bus; /* Fake bus and device */
169 u32 id;
170
171 bus.number = 0;
172
173 if (o->read(&bus, 0, PCI_VENDOR_ID, 4, &id) == PCIBIOS_SUCCESSFUL) {
174 printk("PCI: VDK Bridge device:vendor: %08x\n", id);
175 if (id == 0x200e10cf)
176 return 1;
177 }
178
179 printk("PCI: VDK Bridge: Sanity check failed\n");
180 return 0;
181}
182
183static struct pci_ops * __init pci_check_direct(void)
184{
185 unsigned long flags;
186
187 local_irq_save(flags);
188
189 /* check if access works */
190 if (pci_sanity_check(&pci_direct_frv)) {
191 local_irq_restore(flags);
192 printk("PCI: Using configuration frv\n");
193// request_mem_region(0xBE040000, 256, "FRV bridge");
194// request_mem_region(0xBFFFFFF4, 12, "PCI frv");
195 return &pci_direct_frv;
196 }
197
198 local_irq_restore(flags);
199 return NULL;
200}
201
202/*
203 * Several buggy motherboards address only 16 devices and mirror
204 * them to next 16 IDs. We try to detect this `feature' on all
205 * primary buses (those containing host bridges as they are
206 * expected to be unique) and remove the ghost devices.
207 */
208
209static void __init pcibios_fixup_ghosts(struct pci_bus *b)
210{
211 struct list_head *ln, *mn;
212 struct pci_dev *d, *e;
213 int mirror = PCI_DEVFN(16,0);
214 int seen_host_bridge = 0;
215 int i;
216
217 for (ln=b->devices.next; ln != &b->devices; ln=ln->next) {
218 d = pci_dev_b(ln);
219 if ((d->class >> 8) == PCI_CLASS_BRIDGE_HOST)
220 seen_host_bridge++;
221 for (mn=ln->next; mn != &b->devices; mn=mn->next) {
222 e = pci_dev_b(mn);
223 if (e->devfn != d->devfn + mirror ||
224 e->vendor != d->vendor ||
225 e->device != d->device ||
226 e->class != d->class)
227 continue;
228 for(i=0; i<PCI_NUM_RESOURCES; i++)
229 if (e->resource[i].start != d->resource[i].start ||
230 e->resource[i].end != d->resource[i].end ||
231 e->resource[i].flags != d->resource[i].flags)
232 continue;
233 break;
234 }
235 if (mn == &b->devices)
236 return;
237 }
238 if (!seen_host_bridge)
239 return;
240 printk("PCI: Ignoring ghost devices on bus %02x\n", b->number);
241
242 ln = &b->devices;
243 while (ln->next != &b->devices) {
244 d = pci_dev_b(ln->next);
245 if (d->devfn >= mirror) {
246 list_del(&d->global_list);
247 list_del(&d->bus_list);
248 kfree(d);
249 } else
250 ln = ln->next;
251 }
252}
253
254/*
255 * Discover remaining PCI buses in case there are peer host bridges.
256 * We use the number of last PCI bus provided by the PCI BIOS.
257 */
258static void __init pcibios_fixup_peer_bridges(void)
259{
260 struct pci_bus bus;
261 struct pci_dev dev;
262 int n;
263 u16 l;
264
265 if (pcibios_last_bus <= 0 || pcibios_last_bus >= 0xff)
266 return;
267 printk("PCI: Peer bridge fixup\n");
268 for (n=0; n <= pcibios_last_bus; n++) {
269 if (pci_find_bus(0, n))
270 continue;
271 bus.number = n;
272 bus.ops = pci_root_ops;
273 dev.bus = &bus;
274 for(dev.devfn=0; dev.devfn<256; dev.devfn += 8)
275 if (!pci_read_config_word(&dev, PCI_VENDOR_ID, &l) &&
276 l != 0x0000 && l != 0xffff) {
277 printk("Found device at %02x:%02x [%04x]\n", n, dev.devfn, l);
278 printk("PCI: Discovered peer bus %02x\n", n);
279 pci_scan_bus(n, pci_root_ops, NULL);
280 break;
281 }
282 }
283}
284
285/*
286 * Exceptions for specific devices. Usually work-arounds for fatal design flaws.
287 */
288
289static void __init pci_fixup_umc_ide(struct pci_dev *d)
290{
291 /*
292 * UM8886BF IDE controller sets region type bits incorrectly,
293 * therefore they look like memory despite of them being I/O.
294 */
295 int i;
296
297 printk("PCI: Fixing base address flags for device %s\n", pci_name(d));
298 for(i=0; i<4; i++)
299 d->resource[i].flags |= PCI_BASE_ADDRESS_SPACE_IO;
300}
301
302static void __init pci_fixup_ide_bases(struct pci_dev *d)
303{
304 int i;
305
306 /*
307 * PCI IDE controllers use non-standard I/O port decoding, respect it.
308 */
309 if ((d->class >> 8) != PCI_CLASS_STORAGE_IDE)
310 return;
311 printk("PCI: IDE base address fixup for %s\n", pci_name(d));
312 for(i=0; i<4; i++) {
313 struct resource *r = &d->resource[i];
314 if ((r->start & ~0x80) == 0x374) {
315 r->start |= 2;
316 r->end = r->start;
317 }
318 }
319}
320
321static void __init pci_fixup_ide_trash(struct pci_dev *d)
322{
323 int i;
324
325 /*
326 * There exist PCI IDE controllers which have utter garbage
327 * in first four base registers. Ignore that.
328 */
329 printk("PCI: IDE base address trash cleared for %s\n", pci_name(d));
330 for(i=0; i<4; i++)
331 d->resource[i].start = d->resource[i].end = d->resource[i].flags = 0;
332}
333
334static void __devinit pci_fixup_latency(struct pci_dev *d)
335{
336 /*
337 * SiS 5597 and 5598 chipsets require latency timer set to
338 * at most 32 to avoid lockups.
339 */
340 DBG("PCI: Setting max latency to 32\n");
341 pcibios_max_latency = 32;
342}
343
344DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_UMC, PCI_DEVICE_ID_UMC_UM8886BF, pci_fixup_umc_ide);
345DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_SI, PCI_DEVICE_ID_SI_5513, pci_fixup_ide_trash);
346DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_SI, PCI_DEVICE_ID_SI_5597, pci_fixup_latency);
347DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_SI, PCI_DEVICE_ID_SI_5598, pci_fixup_latency);
348DECLARE_PCI_FIXUP_HEADER(PCI_ANY_ID, PCI_ANY_ID, pci_fixup_ide_bases);
349
350/*
351 * Called after each bus is probed, but before its children
352 * are examined.
353 */
354
355void __init pcibios_fixup_bus(struct pci_bus *bus)
356{
357#if 0
358 printk("### PCIBIOS_FIXUP_BUS(%d)\n",bus->number);
359#endif
360 pcibios_fixup_ghosts(bus);
361 pci_read_bridge_bases(bus);
362
363 if (bus->number == 0) {
364 struct list_head *ln;
365 struct pci_dev *dev;
366 for (ln=bus->devices.next; ln != &bus->devices; ln=ln->next) {
367 dev = pci_dev_b(ln);
368 if (dev->devfn == 0) {
369 dev->resource[0].start = 0;
370 dev->resource[0].end = 0;
371 }
372 }
373 }
374}
375
376/*
377 * Initialization. Try all known PCI access methods. Note that we support
378 * using both PCI BIOS and direct access: in such cases, we use I/O ports
379 * to access config space, but we still keep BIOS order of cards to be
380 * compatible with 2.0.X. This should go away some day.
381 */
382
383int __init pcibios_init(void)
384{
385 struct pci_ops *dir = NULL;
386
387 if (!mb93090_mb00_detected)
388 return -ENXIO;
389
390 __reg_MB86943_sl_ctl |= MB86943_SL_CTL_DRCT_MASTER_SWAP | MB86943_SL_CTL_DRCT_SLAVE_SWAP;
391
392 __reg_MB86943_ecs_base(1) = ((__region_CS2 + 0x01000000) >> 9) | 0x08000000;
393 __reg_MB86943_ecs_base(2) = ((__region_CS2 + 0x00000000) >> 9) | 0x08000000;
394
395 *(volatile uint32_t *) (__region_CS1 + 0x848) = 0xe0000000;
396 *(volatile uint32_t *) (__region_CS1 + 0x8b8) = 0x00000000;
397
398 __reg_MB86943_sl_pci_io_base = (__region_CS2 + 0x04000000) >> 9;
399 __reg_MB86943_sl_pci_mem_base = (__region_CS2 + 0x08000000) >> 9;
400 __reg_MB86943_pci_sl_io_base = __region_CS2 + 0x04000000;
401 __reg_MB86943_pci_sl_mem_base = __region_CS2 + 0x08000000;
402 mb();
403
404 *(volatile unsigned long *)(__region_CS2+0x01300014) == 1;
405
406 ioport_resource.start = (__reg_MB86943_sl_pci_io_base << 9) & 0xfffffc00;
407 ioport_resource.end = (__reg_MB86943_sl_pci_io_range << 9) | 0x3ff;
408 ioport_resource.end += ioport_resource.start;
409
410 printk("PCI IO window: %08lx-%08lx\n", ioport_resource.start, ioport_resource.end);
411
412 iomem_resource.start = (__reg_MB86943_sl_pci_mem_base << 9) & 0xfffffc00;
413
414 /* Reserve somewhere to write to flush posted writes. */
415 iomem_resource.start += 0x400;
416
417 iomem_resource.end = (__reg_MB86943_sl_pci_mem_range << 9) | 0x3ff;
418 iomem_resource.end += iomem_resource.start;
419
420 printk("PCI MEM window: %08lx-%08lx\n", iomem_resource.start, iomem_resource.end);
421 printk("PCI DMA memory: %08lx-%08lx\n", dma_coherent_mem_start, dma_coherent_mem_end);
422
423 if (!pci_probe)
424 return -ENXIO;
425
426 dir = pci_check_direct();
427 if (dir)
428 pci_root_ops = dir;
429 else {
430 printk("PCI: No PCI bus detected\n");
431 return -ENXIO;
432 }
433
434 printk("PCI: Probing PCI hardware\n");
435 pci_root_bus = pci_scan_bus(0, pci_root_ops, NULL);
436
437 pcibios_irq_init();
438 pcibios_fixup_peer_bridges();
439 pcibios_fixup_irqs();
440 pcibios_resource_survey();
441
442 return 0;
443}
444
445arch_initcall(pcibios_init);
446
447char * __init pcibios_setup(char *str)
448{
449 if (!strcmp(str, "off")) {
450 pci_probe = 0;
451 return NULL;
452 } else if (!strncmp(str, "lastbus=", 8)) {
453 pcibios_last_bus = simple_strtol(str+8, NULL, 0);
454 return NULL;
455 }
456 return str;
457}
458
459int pcibios_enable_device(struct pci_dev *dev, int mask)
460{
461 int err;
462
463 if ((err = pcibios_enable_resources(dev, mask)) < 0)
464 return err;
465 pcibios_enable_irq(dev);
466 return 0;
467}
generated by cgit v1.2.2 (git 2.25.0) at 2024-10-24 01:21:13 -0400