diff options
Diffstat (limited to 'drivers/pcmcia/cardbus.c')
| -rw-r--r-- | drivers/pcmcia/cardbus.c | 247 |
1 files changed, 247 insertions, 0 deletions
diff --git a/drivers/pcmcia/cardbus.c b/drivers/pcmcia/cardbus.c new file mode 100644 index 000000000000..3ccb5247ec50 --- /dev/null +++ b/drivers/pcmcia/cardbus.c @@ -0,0 +1,247 @@ +/* + * cardbus.c -- 16-bit PCMCIA core support + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License version 2 as + * published by the Free Software Foundation. + * + * The initial developer of the original code is David A. Hinds + * <dahinds@users.sourceforge.net>. Portions created by David A. Hinds + * are Copyright (C) 1999 David A. Hinds. All Rights Reserved. + * + * (C) 1999 David A. Hinds + */ + +/* + * Cardbus handling has been re-written to be more of a PCI bridge thing, + * and the PCI code basically does all the resource handling. + * + * Linus, Jan 2000 + */ + + +#include <linux/module.h> +#include <linux/kernel.h> +#include <linux/string.h> +#include <linux/slab.h> +#include <linux/mm.h> +#include <linux/pci.h> +#include <linux/ioport.h> +#include <asm/irq.h> +#include <asm/io.h> + +#define IN_CARD_SERVICES +#include <pcmcia/version.h> +#include <pcmcia/cs_types.h> +#include <pcmcia/ss.h> +#include <pcmcia/cs.h> +#include <pcmcia/bulkmem.h> +#include <pcmcia/cistpl.h> +#include "cs_internal.h" + +/*====================================================================*/ + +#define FIND_FIRST_BIT(n) ((n) - ((n) & ((n)-1))) + +/* Offsets in the Expansion ROM Image Header */ +#define ROM_SIGNATURE 0x0000 /* 2 bytes */ +#define ROM_DATA_PTR 0x0018 /* 2 bytes */ + +/* Offsets in the CardBus PC Card Data Structure */ +#define PCDATA_SIGNATURE 0x0000 /* 4 bytes */ +#define PCDATA_VPD_PTR 0x0008 /* 2 bytes */ +#define PCDATA_LENGTH 0x000a /* 2 bytes */ +#define PCDATA_REVISION 0x000c +#define PCDATA_IMAGE_SZ 0x0010 /* 2 bytes */ +#define PCDATA_ROM_LEVEL 0x0012 /* 2 bytes */ +#define PCDATA_CODE_TYPE 0x0014 +#define PCDATA_INDICATOR 0x0015 + +/*===================================================================== + + Expansion ROM's have a special layout, and pointers specify an + image number and an offset within that image. xlate_rom_addr() + converts an image/offset address to an absolute offset from the + ROM's base address. + +=====================================================================*/ + +static u_int xlate_rom_addr(void __iomem *b, u_int addr) +{ + u_int img = 0, ofs = 0, sz; + u_short data; + while ((readb(b) == 0x55) && (readb(b + 1) == 0xaa)) { + if (img == (addr >> 28)) + return (addr & 0x0fffffff) + ofs; + data = readb(b + ROM_DATA_PTR) + (readb(b + ROM_DATA_PTR + 1) << 8); + sz = 512 * (readb(b + data + PCDATA_IMAGE_SZ) + + (readb(b + data + PCDATA_IMAGE_SZ + 1) << 8)); + if ((sz == 0) || (readb(b + data + PCDATA_INDICATOR) & 0x80)) + break; + b += sz; + ofs += sz; + img++; + } + return 0; +} + +/*===================================================================== + + These are similar to setup_cis_mem and release_cis_mem for 16-bit + cards. The "result" that is used externally is the cb_cis_virt + pointer in the struct pcmcia_socket structure. + +=====================================================================*/ + +static void cb_release_cis_mem(struct pcmcia_socket * s) +{ + if (s->cb_cis_virt) { + cs_dbg(s, 1, "cb_release_cis_mem()\n"); + iounmap(s->cb_cis_virt); + s->cb_cis_virt = NULL; + s->cb_cis_res = NULL; + } +} + +static int cb_setup_cis_mem(struct pcmcia_socket * s, struct resource *res) +{ + unsigned int start, size; + + if (res == s->cb_cis_res) + return 0; + + if (s->cb_cis_res) + cb_release_cis_mem(s); + + start = res->start; + size = res->end - start + 1; + s->cb_cis_virt = ioremap(start, size); + + if (!s->cb_cis_virt) + return -1; + + s->cb_cis_res = res; + + return 0; +} + +/*===================================================================== + + This is used by the CIS processing code to read CIS information + from a CardBus device. + +=====================================================================*/ + +int read_cb_mem(struct pcmcia_socket * s, int space, u_int addr, u_int len, void *ptr) +{ + struct pci_dev *dev; + struct resource *res; + + cs_dbg(s, 3, "read_cb_mem(%d, %#x, %u)\n", space, addr, len); + + dev = pci_find_slot(s->cb_dev->subordinate->number, 0); + if (!dev) + goto fail; + + /* Config space? */ + if (space == 0) { + if (addr + len > 0x100) + goto fail; + for (; len; addr++, ptr++, len--) + pci_read_config_byte(dev, addr, ptr); + return 0; + } + + res = dev->resource + space - 1; + if (!res->flags) + goto fail; + + if (cb_setup_cis_mem(s, res) != 0) + goto fail; + + if (space == 7) { + addr = xlate_rom_addr(s->cb_cis_virt, addr); + if (addr == 0) + goto fail; + } + + if (addr + len > res->end - res->start) + goto fail; + + memcpy_fromio(ptr, s->cb_cis_virt + addr, len); + return 0; + +fail: + memset(ptr, 0xff, len); + return -1; +} + +/*===================================================================== + + cb_alloc() and cb_free() allocate and free the kernel data + structures for a Cardbus device, and handle the lowest level PCI + device setup issues. + +=====================================================================*/ + +/* + * Since there is only one interrupt available to CardBus + * devices, all devices downstream of this device must + * be using this IRQ. + */ +static void cardbus_assign_irqs(struct pci_bus *bus, int irq) +{ + struct pci_dev *dev; + + list_for_each_entry(dev, &bus->devices, bus_list) { + u8 irq_pin; + + pci_read_config_byte(dev, PCI_INTERRUPT_PIN, &irq_pin); + if (irq_pin) { + dev->irq = irq; + pci_write_config_byte(dev, PCI_INTERRUPT_LINE, dev->irq); + } + + if (dev->subordinate) + cardbus_assign_irqs(dev->subordinate, irq); + } +} + +int cb_alloc(struct pcmcia_socket * s) +{ + struct pci_bus *bus = s->cb_dev->subordinate; + struct pci_dev *dev; + unsigned int max, pass; + + s->functions = pci_scan_slot(bus, PCI_DEVFN(0, 0)); +// pcibios_fixup_bus(bus); + + max = bus->secondary; + for (pass = 0; pass < 2; pass++) + list_for_each_entry(dev, &bus->devices, bus_list) + if (dev->hdr_type == PCI_HEADER_TYPE_BRIDGE || + dev->hdr_type == PCI_HEADER_TYPE_CARDBUS) + max = pci_scan_bridge(bus, dev, max, pass); + + /* + * Size all resources below the CardBus controller. + */ + pci_bus_size_bridges(bus); + pci_bus_assign_resources(bus); + cardbus_assign_irqs(bus, s->pci_irq); + pci_enable_bridges(bus); + pci_bus_add_devices(bus); + + s->irq.AssignedIRQ = s->pci_irq; + return CS_SUCCESS; +} + +void cb_free(struct pcmcia_socket * s) +{ + struct pci_dev *bridge = s->cb_dev; + + cb_release_cis_mem(s); + + if (bridge) + pci_remove_behind_bridge(bridge); +} |