Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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 | } |