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.
23 #include <linux/module.h>
24 #include <linux/kernel.h>
25 #include <linux/string.h>
26 #include <linux/slab.h>
28 #include <linux/pci.h>
29 #include <linux/ioport.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
67 =====================================================================*/
69 static u_int
xlate_rom_addr(void __iomem
*b
, u_int addr
)
71 u_int img
= 0, ofs
= 0, sz
;
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))
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
)
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
)
114 cb_release_cis_mem(s
);
117 size
= res
->end
- start
+ 1;
118 s
->cb_cis_virt
= ioremap(start
, size
);
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
)
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);
148 if (addr
+ len
> 0x100)
150 for (; len
; addr
++, ptr
++, len
--)
151 pci_read_config_byte(dev
, addr
, ptr
);
155 res
= dev
->resource
+ space
- 1;
159 if (cb_setup_cis_mem(s
, res
) != 0)
163 addr
= xlate_rom_addr(s
->cb_cis_virt
, addr
);
168 if (addr
+ len
> res
->end
- res
->start
)
171 memcpy_fromio(ptr
, s
->cb_cis_virt
+ addr
, len
);
175 memset(ptr
, 0xff, len
);
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
185 =====================================================================*/
188 * Since there is only one interrupt available to CardBus
189 * devices, all devices downstream of this device must
192 static void cardbus_assign_irqs(struct pci_bus
*bus
, int irq
)
196 list_for_each_entry(dev
, &bus
->devices
, bus_list
) {
199 pci_read_config_byte(dev
, PCI_INTERRUPT_PIN
, &irq_pin
);
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
;
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
;
239 void cb_free(struct pcmcia_socket
* s
)
241 struct pci_dev
*bridge
= s
->cb_dev
;
243 cb_release_cis_mem(s
);
246 pci_remove_behind_bridge(bridge
);