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1da177e4 LT |
1 | /* |
2 | * cardbus.c -- 16-bit PCMCIA core support | |
3 | * | |
4 | * This program is free software; you can redistribute it and/or modify | |
5 | * it under the terms of the GNU General Public License version 2 as | |
6 | * published by the Free Software Foundation. | |
7 | * | |
8 | * The initial developer of the original code is David A. Hinds | |
9 | * <dahinds@users.sourceforge.net>. Portions created by David A. Hinds | |
10 | * are Copyright (C) 1999 David A. Hinds. All Rights Reserved. | |
11 | * | |
12 | * (C) 1999 David A. Hinds | |
13 | */ | |
14 | ||
15 | /* | |
16 | * Cardbus handling has been re-written to be more of a PCI bridge thing, | |
17 | * and the PCI code basically does all the resource handling. | |
18 | * | |
19 | * Linus, Jan 2000 | |
20 | */ | |
21 | ||
22 | ||
23 | #include <linux/module.h> | |
24 | #include <linux/kernel.h> | |
25 | #include <linux/string.h> | |
26 | #include <linux/slab.h> | |
27 | #include <linux/mm.h> | |
28 | #include <linux/pci.h> | |
29 | #include <linux/ioport.h> | |
30 | #include <asm/irq.h> | |
31 | #include <asm/io.h> | |
32 | ||
1da177e4 LT |
33 | #include <pcmcia/cs_types.h> |
34 | #include <pcmcia/ss.h> | |
35 | #include <pcmcia/cs.h> | |
1da177e4 LT |
36 | #include <pcmcia/cistpl.h> |
37 | #include "cs_internal.h" | |
38 | ||
39 | /*====================================================================*/ | |
40 | ||
1da177e4 LT |
41 | /* Offsets in the Expansion ROM Image Header */ |
42 | #define ROM_SIGNATURE 0x0000 /* 2 bytes */ | |
43 | #define ROM_DATA_PTR 0x0018 /* 2 bytes */ | |
44 | ||
45 | /* Offsets in the CardBus PC Card Data Structure */ | |
46 | #define PCDATA_SIGNATURE 0x0000 /* 4 bytes */ | |
47 | #define PCDATA_VPD_PTR 0x0008 /* 2 bytes */ | |
48 | #define PCDATA_LENGTH 0x000a /* 2 bytes */ | |
49 | #define PCDATA_REVISION 0x000c | |
50 | #define PCDATA_IMAGE_SZ 0x0010 /* 2 bytes */ | |
51 | #define PCDATA_ROM_LEVEL 0x0012 /* 2 bytes */ | |
52 | #define PCDATA_CODE_TYPE 0x0014 | |
53 | #define PCDATA_INDICATOR 0x0015 | |
54 | ||
55 | /*===================================================================== | |
56 | ||
57 | Expansion ROM's have a special layout, and pointers specify an | |
58 | image number and an offset within that image. xlate_rom_addr() | |
59 | converts an image/offset address to an absolute offset from the | |
60 | ROM's base address. | |
61 | ||
62 | =====================================================================*/ | |
63 | ||
64 | static u_int xlate_rom_addr(void __iomem *b, u_int addr) | |
65 | { | |
66 | u_int img = 0, ofs = 0, sz; | |
67 | u_short data; | |
68 | while ((readb(b) == 0x55) && (readb(b + 1) == 0xaa)) { | |
69 | if (img == (addr >> 28)) | |
70 | return (addr & 0x0fffffff) + ofs; | |
71 | data = readb(b + ROM_DATA_PTR) + (readb(b + ROM_DATA_PTR + 1) << 8); | |
72 | sz = 512 * (readb(b + data + PCDATA_IMAGE_SZ) + | |
73 | (readb(b + data + PCDATA_IMAGE_SZ + 1) << 8)); | |
74 | if ((sz == 0) || (readb(b + data + PCDATA_INDICATOR) & 0x80)) | |
75 | break; | |
76 | b += sz; | |
77 | ofs += sz; | |
78 | img++; | |
79 | } | |
80 | return 0; | |
81 | } | |
82 | ||
83 | /*===================================================================== | |
84 | ||
85 | These are similar to setup_cis_mem and release_cis_mem for 16-bit | |
86 | cards. The "result" that is used externally is the cb_cis_virt | |
87 | pointer in the struct pcmcia_socket structure. | |
88 | ||
89 | =====================================================================*/ | |
90 | ||
91 | static void cb_release_cis_mem(struct pcmcia_socket * s) | |
92 | { | |
93 | if (s->cb_cis_virt) { | |
94 | cs_dbg(s, 1, "cb_release_cis_mem()\n"); | |
95 | iounmap(s->cb_cis_virt); | |
96 | s->cb_cis_virt = NULL; | |
97 | s->cb_cis_res = NULL; | |
98 | } | |
99 | } | |
100 | ||
101 | static int cb_setup_cis_mem(struct pcmcia_socket * s, struct resource *res) | |
102 | { | |
103 | unsigned int start, size; | |
104 | ||
105 | if (res == s->cb_cis_res) | |
106 | return 0; | |
107 | ||
108 | if (s->cb_cis_res) | |
109 | cb_release_cis_mem(s); | |
110 | ||
111 | start = res->start; | |
112 | size = res->end - start + 1; | |
113 | s->cb_cis_virt = ioremap(start, size); | |
114 | ||
115 | if (!s->cb_cis_virt) | |
116 | return -1; | |
117 | ||
118 | s->cb_cis_res = res; | |
119 | ||
120 | return 0; | |
121 | } | |
122 | ||
123 | /*===================================================================== | |
124 | ||
125 | This is used by the CIS processing code to read CIS information | |
126 | from a CardBus device. | |
127 | ||
128 | =====================================================================*/ | |
129 | ||
130 | int read_cb_mem(struct pcmcia_socket * s, int space, u_int addr, u_int len, void *ptr) | |
131 | { | |
132 | struct pci_dev *dev; | |
133 | struct resource *res; | |
134 | ||
135 | cs_dbg(s, 3, "read_cb_mem(%d, %#x, %u)\n", space, addr, len); | |
136 | ||
74ae3221 | 137 | dev = pci_get_slot(s->cb_dev->subordinate, 0); |
1da177e4 LT |
138 | if (!dev) |
139 | goto fail; | |
140 | ||
141 | /* Config space? */ | |
142 | if (space == 0) { | |
143 | if (addr + len > 0x100) | |
1523508d | 144 | goto failput; |
1da177e4 LT |
145 | for (; len; addr++, ptr++, len--) |
146 | pci_read_config_byte(dev, addr, ptr); | |
147 | return 0; | |
148 | } | |
149 | ||
150 | res = dev->resource + space - 1; | |
74ae3221 AC |
151 | |
152 | pci_dev_put(dev); | |
153 | ||
1da177e4 LT |
154 | if (!res->flags) |
155 | goto fail; | |
156 | ||
157 | if (cb_setup_cis_mem(s, res) != 0) | |
158 | goto fail; | |
159 | ||
160 | if (space == 7) { | |
161 | addr = xlate_rom_addr(s->cb_cis_virt, addr); | |
162 | if (addr == 0) | |
163 | goto fail; | |
164 | } | |
165 | ||
166 | if (addr + len > res->end - res->start) | |
167 | goto fail; | |
168 | ||
169 | memcpy_fromio(ptr, s->cb_cis_virt + addr, len); | |
170 | return 0; | |
171 | ||
1523508d JL |
172 | failput: |
173 | pci_dev_put(dev); | |
1da177e4 LT |
174 | fail: |
175 | memset(ptr, 0xff, len); | |
176 | return -1; | |
177 | } | |
178 | ||
179 | /*===================================================================== | |
180 | ||
181 | cb_alloc() and cb_free() allocate and free the kernel data | |
182 | structures for a Cardbus device, and handle the lowest level PCI | |
183 | device setup issues. | |
184 | ||
185 | =====================================================================*/ | |
186 | ||
187 | /* | |
188 | * Since there is only one interrupt available to CardBus | |
189 | * devices, all devices downstream of this device must | |
190 | * be using this IRQ. | |
191 | */ | |
192 | static void cardbus_assign_irqs(struct pci_bus *bus, int irq) | |
193 | { | |
194 | struct pci_dev *dev; | |
195 | ||
196 | list_for_each_entry(dev, &bus->devices, bus_list) { | |
197 | u8 irq_pin; | |
198 | ||
199 | pci_read_config_byte(dev, PCI_INTERRUPT_PIN, &irq_pin); | |
200 | if (irq_pin) { | |
201 | dev->irq = irq; | |
202 | pci_write_config_byte(dev, PCI_INTERRUPT_LINE, dev->irq); | |
203 | } | |
204 | ||
205 | if (dev->subordinate) | |
206 | cardbus_assign_irqs(dev->subordinate, irq); | |
207 | } | |
208 | } | |
209 | ||
e772d782 | 210 | int __ref cb_alloc(struct pcmcia_socket * s) |
1da177e4 LT |
211 | { |
212 | struct pci_bus *bus = s->cb_dev->subordinate; | |
213 | struct pci_dev *dev; | |
214 | unsigned int max, pass; | |
215 | ||
216 | s->functions = pci_scan_slot(bus, PCI_DEVFN(0, 0)); | |
217 | // pcibios_fixup_bus(bus); | |
218 | ||
219 | max = bus->secondary; | |
220 | for (pass = 0; pass < 2; pass++) | |
221 | list_for_each_entry(dev, &bus->devices, bus_list) | |
222 | if (dev->hdr_type == PCI_HEADER_TYPE_BRIDGE || | |
223 | dev->hdr_type == PCI_HEADER_TYPE_CARDBUS) | |
224 | max = pci_scan_bridge(bus, dev, max, pass); | |
225 | ||
226 | /* | |
227 | * Size all resources below the CardBus controller. | |
228 | */ | |
229 | pci_bus_size_bridges(bus); | |
230 | pci_bus_assign_resources(bus); | |
231 | cardbus_assign_irqs(bus, s->pci_irq); | |
8c3520d4 DR |
232 | |
233 | /* socket specific tune function */ | |
234 | if (s->tune_bridge) | |
235 | s->tune_bridge(s, bus); | |
236 | ||
1da177e4 LT |
237 | pci_enable_bridges(bus); |
238 | pci_bus_add_devices(bus); | |
239 | ||
240 | s->irq.AssignedIRQ = s->pci_irq; | |
4c89e88b | 241 | return 0; |
1da177e4 LT |
242 | } |
243 | ||
244 | void cb_free(struct pcmcia_socket * s) | |
245 | { | |
246 | struct pci_dev *bridge = s->cb_dev; | |
247 | ||
248 | cb_release_cis_mem(s); | |
249 | ||
250 | if (bridge) | |
251 | pci_remove_behind_bridge(bridge); | |
252 | } |