/*
* 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 <linux/io.h>
#include <asm/irq.h>
#include <pcmcia/cs_types.h>
#include <pcmcia/ss.h>
#include <pcmcia/cs.h>
#include <pcmcia/cistpl.h>
#include "cs_internal.h"
/*====================================================================*/
/* 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) {
dev_dbg(&s->dev, "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;
dev_dbg(&s->dev, "read_cb_mem(%d, %#x, %u)\n", space, addr, len);
dev = pci_get_slot(s->cb_dev->subordinate, 0);
if (!dev)
goto fail;
/* Config space? */
if (space == 0) {
if (addr + len > 0x100)
goto failput;
for (; len; addr++, ptr++, len--)
pci_read_config_byte(dev, addr, ptr);
return 0;
}
res = dev->resource + space - 1;
pci_dev_put(dev);
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;
failput:
pci_dev_put(dev);
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.
=====================================================================*/
static void cardbus_config_irq_and_cls(struct pci_bus *bus, int irq)
{
struct pci_dev *dev;
list_for_each_entry(dev, &bus->devices, bus_list) {
u8 irq_pin;
/*
* Since there is only one interrupt available to
* CardBus devices, all devices downstream of this
* device must be using this IRQ.
*/
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);
}
/*
* Some controllers transfer very slowly with 0 CLS.
* Configure it. This may fail as CLS configuration
* is mandatory only for MWI.
*/
pci_set_cacheline_size(dev);
if (dev->subordinate)
cardbus_config_irq_and_cls(dev->subordinate, irq);
}
}
int __ref 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));
pci_fixup_cardbus(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_config_irq_and_cls(bus, s->pci_irq);
/* socket specific tune function */
if (s->tune_bridge)
s->tune_bridge(s, bus);
pci_enable_bridges(bus);
pci_bus_add_devices(bus);
s->irq.AssignedIRQ = s->pci_irq;
return 0;
}
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);
}
