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[linux-2.6/verdex.git] / drivers / pcmcia / cardbus.c
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1 /*
2 * cardbus.c -- 16-bit PCMCIA core support
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.
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.
12 * (C) 1999 David A. Hinds
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.
19 * Linus, Jan 2000
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>
33 #define IN_CARD_SERVICES
34 #include <pcmcia/version.h>
35 #include <pcmcia/cs_types.h>
36 #include <pcmcia/ss.h>
37 #include <pcmcia/cs.h>
38 #include <pcmcia/bulkmem.h>
39 #include <pcmcia/cistpl.h>
40 #include "cs_internal.h"
42 /*====================================================================*/
44 #define FIND_FIRST_BIT(n) ((n) - ((n) & ((n)-1)))
46 /* Offsets in the Expansion ROM Image Header */
47 #define ROM_SIGNATURE 0x0000 /* 2 bytes */
48 #define ROM_DATA_PTR 0x0018 /* 2 bytes */
50 /* Offsets in the CardBus PC Card Data Structure */
51 #define PCDATA_SIGNATURE 0x0000 /* 4 bytes */
52 #define PCDATA_VPD_PTR 0x0008 /* 2 bytes */
53 #define PCDATA_LENGTH 0x000a /* 2 bytes */
54 #define PCDATA_REVISION 0x000c
55 #define PCDATA_IMAGE_SZ 0x0010 /* 2 bytes */
56 #define PCDATA_ROM_LEVEL 0x0012 /* 2 bytes */
57 #define PCDATA_CODE_TYPE 0x0014
58 #define PCDATA_INDICATOR 0x0015
60 /*=====================================================================
62 Expansion ROM's have a special layout, and pointers specify an
63 image number and an offset within that image. xlate_rom_addr()
64 converts an image/offset address to an absolute offset from the
65 ROM's base address.
67 =====================================================================*/
69 static u_int xlate_rom_addr(void __iomem *b, u_int addr)
71 u_int img = 0, ofs = 0, sz;
72 u_short data;
73 while ((readb(b) == 0x55) && (readb(b + 1) == 0xaa)) {
74 if (img == (addr >> 28))
75 return (addr & 0x0fffffff) + ofs;
76 data = readb(b + ROM_DATA_PTR) + (readb(b + ROM_DATA_PTR + 1) << 8);
77 sz = 512 * (readb(b + data + PCDATA_IMAGE_SZ) +
78 (readb(b + data + PCDATA_IMAGE_SZ + 1) << 8));
79 if ((sz == 0) || (readb(b + data + PCDATA_INDICATOR) & 0x80))
80 break;
81 b += sz;
82 ofs += sz;
83 img++;
85 return 0;
88 /*=====================================================================
90 These are similar to setup_cis_mem and release_cis_mem for 16-bit
91 cards. The "result" that is used externally is the cb_cis_virt
92 pointer in the struct pcmcia_socket structure.
94 =====================================================================*/
96 static void cb_release_cis_mem(struct pcmcia_socket * s)
98 if (s->cb_cis_virt) {
99 cs_dbg(s, 1, "cb_release_cis_mem()\n");
100 iounmap(s->cb_cis_virt);
101 s->cb_cis_virt = NULL;
102 s->cb_cis_res = NULL;
106 static int cb_setup_cis_mem(struct pcmcia_socket * s, struct resource *res)
108 unsigned int start, size;
110 if (res == s->cb_cis_res)
111 return 0;
113 if (s->cb_cis_res)
114 cb_release_cis_mem(s);
116 start = res->start;
117 size = res->end - start + 1;
118 s->cb_cis_virt = ioremap(start, size);
120 if (!s->cb_cis_virt)
121 return -1;
123 s->cb_cis_res = res;
125 return 0;
128 /*=====================================================================
130 This is used by the CIS processing code to read CIS information
131 from a CardBus device.
133 =====================================================================*/
135 int read_cb_mem(struct pcmcia_socket * s, int space, u_int addr, u_int len, void *ptr)
137 struct pci_dev *dev;
138 struct resource *res;
140 cs_dbg(s, 3, "read_cb_mem(%d, %#x, %u)\n", space, addr, len);
142 dev = pci_find_slot(s->cb_dev->subordinate->number, 0);
143 if (!dev)
144 goto fail;
146 /* Config space? */
147 if (space == 0) {
148 if (addr + len > 0x100)
149 goto fail;
150 for (; len; addr++, ptr++, len--)
151 pci_read_config_byte(dev, addr, ptr);
152 return 0;
155 res = dev->resource + space - 1;
156 if (!res->flags)
157 goto fail;
159 if (cb_setup_cis_mem(s, res) != 0)
160 goto fail;
162 if (space == 7) {
163 addr = xlate_rom_addr(s->cb_cis_virt, addr);
164 if (addr == 0)
165 goto fail;
168 if (addr + len > res->end - res->start)
169 goto fail;
171 memcpy_fromio(ptr, s->cb_cis_virt + addr, len);
172 return 0;
174 fail:
175 memset(ptr, 0xff, len);
176 return -1;
179 /*=====================================================================
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.
185 =====================================================================*/
188 * Since there is only one interrupt available to CardBus
189 * devices, all devices downstream of this device must
190 * be using this IRQ.
192 static void cardbus_assign_irqs(struct pci_bus *bus, int irq)
194 struct pci_dev *dev;
196 list_for_each_entry(dev, &bus->devices, bus_list) {
197 u8 irq_pin;
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);
205 if (dev->subordinate)
206 cardbus_assign_irqs(dev->subordinate, irq);
210 int cb_alloc(struct pcmcia_socket * s)
212 struct pci_bus *bus = s->cb_dev->subordinate;
213 struct pci_dev *dev;
214 unsigned int max, pass;
216 s->functions = pci_scan_slot(bus, PCI_DEVFN(0, 0));
217 // pcibios_fixup_bus(bus);
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);
227 * Size all resources below the CardBus controller.
229 pci_bus_size_bridges(bus);
230 pci_bus_assign_resources(bus);
231 cardbus_assign_irqs(bus, s->pci_irq);
232 pci_enable_bridges(bus);
233 pci_bus_add_devices(bus);
235 s->irq.AssignedIRQ = s->pci_irq;
236 return CS_SUCCESS;
239 void cb_free(struct pcmcia_socket * s)
241 struct pci_dev *bridge = s->cb_dev;
243 cb_release_cis_mem(s);
245 if (bridge)
246 pci_remove_behind_bridge(bridge);