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/cs_types.h>
  35 #include <pcmcia/ss.h>
  36 #include <pcmcia/cs.h>
  37 #include <pcmcia/bulkmem.h>
  38 #include <pcmcia/cistpl.h>
  39 #include "cs_internal.h"
  40
  41 /*====================================================================*/
  42
  43 #define FIND_FIRST_BIT(n)       ((n) - ((n) & ((n)-1)))
  44
  45 /* Offsets in the Expansion ROM Image Header */
  46 #define ROM_SIGNATURE           0x0000  /* 2 bytes */
  47 #define ROM_DATA_PTR            0x0018  /* 2 bytes */
  48
  49 /* Offsets in the CardBus PC Card Data Structure */
  50 #define PCDATA_SIGNATURE        0x0000  /* 4 bytes */
  51 #define PCDATA_VPD_PTR          0x0008  /* 2 bytes */
  52 #define PCDATA_LENGTH           0x000a  /* 2 bytes */
  53 #define PCDATA_REVISION         0x000c
  54 #define PCDATA_IMAGE_SZ         0x0010  /* 2 bytes */
  55 #define PCDATA_ROM_LEVEL        0x0012  /* 2 bytes */
  56 #define PCDATA_CODE_TYPE        0x0014
  57 #define PCDATA_INDICATOR        0x0015
  58
  59 /*=====================================================================
  60
  61     Expansion ROM's have a special layout, and pointers specify an
  62     image number and an offset within that image.  xlate_rom_addr()
  63     converts an image/offset address to an absolute offset from the
  64     ROM's base address.
  65
  66 =====================================================================*/
  67
  68 static u_int xlate_rom_addr(void __iomem *b, u_int addr)
  69 {
  70         u_int img = 0, ofs = 0, sz;
  71         u_short data;
  72         while ((readb(b) == 0x55) && (readb(b + 1) == 0xaa)) {
  73                 if (img == (addr >> 28))
  74                         return (addr & 0x0fffffff) + ofs;
  75                 data = readb(b + ROM_DATA_PTR) + (readb(b + ROM_DATA_PTR + 1) << 8);
  76                 sz = 512 * (readb(b + data + PCDATA_IMAGE_SZ) +
  77                             (readb(b + data + PCDATA_IMAGE_SZ + 1) << 8));
  78                 if ((sz == 0) || (readb(b + data + PCDATA_INDICATOR) & 0x80))
  79                         break;
  80                 b += sz;
  81                 ofs += sz;
  82                 img++;
  83         }
  84         return 0;
  85 }
  86
  87 /*=====================================================================
  88
  89     These are similar to setup_cis_mem and release_cis_mem for 16-bit
  90     cards.  The "result" that is used externally is the cb_cis_virt
  91     pointer in the struct pcmcia_socket structure.
  92
  93 =====================================================================*/
  94
  95 static void cb_release_cis_mem(struct pcmcia_socket * s)
  96 {
  97         if (s->cb_cis_virt) {
  98                 cs_dbg(s, 1, "cb_release_cis_mem()\n");
  99                 iounmap(s->cb_cis_virt);
 100                 s->cb_cis_virt = NULL;
 101                 s->cb_cis_res = NULL;
 102         }
 103 }
 104
 105 static int cb_setup_cis_mem(struct pcmcia_socket * s, struct resource *res)
 106 {
 107         unsigned int start, size;
 108
 109         if (res == s->cb_cis_res)
 110                 return 0;
 111
 112         if (s->cb_cis_res)
 113                 cb_release_cis_mem(s);
 114
 115         start = res->start;
 116         size = res->end - start + 1;
 117         s->cb_cis_virt = ioremap(start, size);
 118
 119         if (!s->cb_cis_virt)
 120                 return -1;
 121
 122         s->cb_cis_res = res;
 123
 124         return 0;
 125 }
 126
 127 /*=====================================================================
 128
 129     This is used by the CIS processing code to read CIS information
 130     from a CardBus device.
 131
 132 =====================================================================*/
 133
 134 int read_cb_mem(struct pcmcia_socket * s, int space, u_int addr, u_int len, void *ptr)
 135 {
 136         struct pci_dev *dev;
 137         struct resource *res;
 138
 139         cs_dbg(s, 3, "read_cb_mem(%d, %#x, %u)\n", space, addr, len);
 140
 141         dev = pci_find_slot(s->cb_dev->subordinate->number, 0);
 142         if (!dev)
 143                 goto fail;
 144
 145         /* Config space? */
 146         if (space == 0) {
 147                 if (addr + len > 0x100)
 148                         goto fail;
 149                 for (; len; addr++, ptr++, len--)
 150                         pci_read_config_byte(dev, addr, ptr);
 151                 return 0;
 152         }
 153
 154         res = dev->resource + space - 1;
 155         if (!res->flags)
 156                 goto fail;
 157
 158         if (cb_setup_cis_mem(s, res) != 0)
 159                 goto fail;
 160
 161         if (space == 7) {
 162                 addr = xlate_rom_addr(s->cb_cis_virt, addr);
 163                 if (addr == 0)
 164                         goto fail;
 165         }
 166
 167         if (addr + len > res->end - res->start)
 168                 goto fail;
 169
 170         memcpy_fromio(ptr, s->cb_cis_virt + addr, len);
 171         return 0;
 172
 173 fail:
 174         memset(ptr, 0xff, len);
 175         return -1;
 176 }
 177
 178 /*=====================================================================
 179
 180     cb_alloc() and cb_free() allocate and free the kernel data
 181     structures for a Cardbus device, and handle the lowest level PCI
 182     device setup issues.
 183
 184 =====================================================================*/
 185
 186 /*
 187  * Since there is only one interrupt available to CardBus
 188  * devices, all devices downstream of this device must
 189  * be using this IRQ.
 190  */
 191 static void cardbus_assign_irqs(struct pci_bus *bus, int irq)
 192 {
 193         struct pci_dev *dev;
 194
 195         list_for_each_entry(dev, &bus->devices, bus_list) {
 196                 u8 irq_pin;
 197
 198                 pci_read_config_byte(dev, PCI_INTERRUPT_PIN, &irq_pin);
 199                 if (irq_pin) {
 200                         dev->irq = irq;
 201                         pci_write_config_byte(dev, PCI_INTERRUPT_LINE, dev->irq);
 202                 }
 203
 204                 if (dev->subordinate)
 205                         cardbus_assign_irqs(dev->subordinate, irq);
 206         }
 207 }
 208
 209 int cb_alloc(struct pcmcia_socket * s)
 210 {
 211         struct pci_bus *bus = s->cb_dev->subordinate;
 212         struct pci_dev *dev;
 213         unsigned int max, pass;
 214
 215         s->functions = pci_scan_slot(bus, PCI_DEVFN(0, 0));
 216 //      pcibios_fixup_bus(bus);
 217
 218         max = bus->secondary;
 219         for (pass = 0; pass < 2; pass++)
 220                 list_for_each_entry(dev, &bus->devices, bus_list)
 221                         if (dev->hdr_type == PCI_HEADER_TYPE_BRIDGE ||
 222                             dev->hdr_type == PCI_HEADER_TYPE_CARDBUS)
 223                                 max = pci_scan_bridge(bus, dev, max, pass);
 224
 225         /*
 226          * Size all resources below the CardBus controller.
 227          */
 228         pci_bus_size_bridges(bus);
 229         pci_bus_assign_resources(bus);
 230         cardbus_assign_irqs(bus, s->pci_irq);
 231         pci_enable_bridges(bus);
 232         pci_bus_add_devices(bus);
 233
 234         s->irq.AssignedIRQ = s->pci_irq;
 235         return CS_SUCCESS;
 236 }
 237
 238 void cb_free(struct pcmcia_socket * s)
 239 {
 240         struct pci_dev *bridge = s->cb_dev;
 241
 242         cb_release_cis_mem(s);
 243
 244         if (bridge)
 245                 pci_remove_behind_bridge(bridge);
 246 }