drivers/pcmcia/cardbus.c

   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
  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"
  41
  42 /*====================================================================*/
  43
  44 #define FIND_FIRST_BIT(n)       ((n) - ((n) & ((n)-1)))
  45
  46 /* Offsets in the Expansion ROM Image Header */
  47 #define ROM_SIGNATURE           0x0000  /* 2 bytes */
  48 #define ROM_DATA_PTR            0x0018  /* 2 bytes */
  49
  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
  59
  60 /*=====================================================================
  61
  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.
  66
  67 =====================================================================*/
  68
  69 static u_int xlate_rom_addr(void __iomem *b, u_int addr)
  70 {
  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++;
  84         }
  85         return 0;
  86 }
  87
  88 /*=====================================================================
  89
  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.
  93
  94 =====================================================================*/
  95
  96 static void cb_release_cis_mem(struct pcmcia_socket * s)
  97 {
  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;
 103         }
 104 }
 105
 106 static int cb_setup_cis_mem(struct pcmcia_socket * s, struct resource *res)
 107 {
 108         unsigned int start, size;
 109
 110         if (res == s->cb_cis_res)
 111                 return 0;
 112
 113         if (s->cb_cis_res)
 114                 cb_release_cis_mem(s);
 115
 116         start = res->start;
 117         size = res->end - start + 1;
 118         s->cb_cis_virt = ioremap(start, size);
 119
 120         if (!s->cb_cis_virt)
 121                 return -1;
 122
 123         s->cb_cis_res = res;
 124
 125         return 0;
 126 }
 127
 128 /*=====================================================================
 129
 130     This is used by the CIS processing code to read CIS information
 131     from a CardBus device.
 132
 133 =====================================================================*/
 134
 135 int read_cb_mem(struct pcmcia_socket * s, int space, u_int addr, u_int len, void *ptr)
 136 {
 137         struct pci_dev *dev;
 138         struct resource *res;
 139
 140         cs_dbg(s, 3, "read_cb_mem(%d, %#x, %u)\n", space, addr, len);
 141
 142         dev = pci_find_slot(s->cb_dev->subordinate->number, 0);
 143         if (!dev)
 144                 goto fail;
 145
 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;
 153         }
 154
 155         res = dev->resource + space - 1;
 156         if (!res->flags)
 157                 goto fail;
 158
 159         if (cb_setup_cis_mem(s, res) != 0)
 160                 goto fail;
 161
 162         if (space == 7) {
 163                 addr = xlate_rom_addr(s->cb_cis_virt, addr);
 164                 if (addr == 0)
 165                         goto fail;
 166         }
 167
 168         if (addr + len > res->end - res->start)
 169                 goto fail;
 170
 171         memcpy_fromio(ptr, s->cb_cis_virt + addr, len);
 172         return 0;
 173
 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
 210 int cb_alloc(struct pcmcia_socket * s)
 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);
 232         pci_enable_bridges(bus);
 233         pci_bus_add_devices(bus);
 234
 235         s->irq.AssignedIRQ = s->pci_irq;
 236         return CS_SUCCESS;
 237 }
 238
 239 void cb_free(struct pcmcia_socket * s)
 240 {
 241         struct pci_dev *bridge = s->cb_dev;
 242
 243         cb_release_cis_mem(s);
 244
 245         if (bridge)
 246                 pci_remove_behind_bridge(bridge);
 247 }