linux/drivers/pcmcia/rsrc_mgr.c
Dominik Brodowski 3b27e9421a [PATCH] pcmcia: properly handle static mem, but dynamic io sockets
Some PCMCIA sockets have statically mapped memory windows, but dynamically
mapped IO windows. Using the "nonstatic" socket library is inpractical for
them, as they do neither need a resource database (as we can trust the
kernel resource database on m68k and ppc) nor lots of other features of that
library. Let them get a small "iodyn" socket library (105 lines of code)
instead.

Signed-off-by: Dominik Brodowski <linux@dominikbrodowski.net>
2006-01-06 00:27:43 +01:00

270 lines
6.1 KiB
C

/*
* rsrc_mgr.c -- Resource management routines and/or wrappers
*
* 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
*/
#include <linux/config.h>
#include <linux/module.h>
#include <linux/kernel.h>
#include <pcmcia/cs_types.h>
#include <pcmcia/ss.h>
#include <pcmcia/cs.h>
#include "cs_internal.h"
#ifdef CONFIG_PCMCIA_PROBE
static int adjust_irq(struct pcmcia_socket *s, adjust_t *adj)
{
int irq;
u32 mask;
irq = adj->resource.irq.IRQ;
if ((irq < 0) || (irq > 15))
return CS_BAD_IRQ;
if (adj->Action != REMOVE_MANAGED_RESOURCE)
return 0;
mask = 1 << irq;
if (!(s->irq_mask & mask))
return 0;
s->irq_mask &= ~mask;
return 0;
}
#else
static inline int adjust_irq(struct pcmcia_socket *s, adjust_t *adj) {
return CS_SUCCESS;
}
#endif
int pcmcia_adjust_resource_info(adjust_t *adj)
{
struct pcmcia_socket *s;
int ret = CS_UNSUPPORTED_FUNCTION;
unsigned long flags;
down_read(&pcmcia_socket_list_rwsem);
list_for_each_entry(s, &pcmcia_socket_list, socket_list) {
if (adj->Resource == RES_IRQ)
ret = adjust_irq(s, adj);
else if (s->resource_ops->adjust_resource) {
/* you can't use the old interface if the new
* one was used before */
spin_lock_irqsave(&s->lock, flags);
if ((s->resource_setup_new) &&
!(s->resource_setup_old)) {
spin_unlock_irqrestore(&s->lock, flags);
continue;
} else if (!(s->resource_setup_old))
s->resource_setup_old = 1;
spin_unlock_irqrestore(&s->lock, flags);
ret = s->resource_ops->adjust_resource(s, adj);
if (!ret) {
/* as there's no way we know this is the
* last call to adjust_resource_info, we
* always need to assume this is the latest
* one... */
spin_lock_irqsave(&s->lock, flags);
s->resource_setup_done = 1;
spin_unlock_irqrestore(&s->lock, flags);
}
}
}
up_read(&pcmcia_socket_list_rwsem);
return (ret);
}
EXPORT_SYMBOL(pcmcia_adjust_resource_info);
int pcmcia_validate_mem(struct pcmcia_socket *s)
{
if (s->resource_ops->validate_mem)
return s->resource_ops->validate_mem(s);
/* if there is no callback, we can assume that everything is OK */
return 0;
}
EXPORT_SYMBOL(pcmcia_validate_mem);
int pcmcia_adjust_io_region(struct resource *res, unsigned long r_start,
unsigned long r_end, struct pcmcia_socket *s)
{
if (s->resource_ops->adjust_io_region)
return s->resource_ops->adjust_io_region(res, r_start, r_end, s);
return -ENOMEM;
}
EXPORT_SYMBOL(pcmcia_adjust_io_region);
struct resource *pcmcia_find_io_region(unsigned long base, int num,
unsigned long align, struct pcmcia_socket *s)
{
if (s->resource_ops->find_io)
return s->resource_ops->find_io(base, num, align, s);
return NULL;
}
EXPORT_SYMBOL(pcmcia_find_io_region);
struct resource *pcmcia_find_mem_region(u_long base, u_long num, u_long align,
int low, struct pcmcia_socket *s)
{
if (s->resource_ops->find_mem)
return s->resource_ops->find_mem(base, num, align, low, s);
return NULL;
}
EXPORT_SYMBOL(pcmcia_find_mem_region);
void release_resource_db(struct pcmcia_socket *s)
{
if (s->resource_ops->exit)
s->resource_ops->exit(s);
}
static int static_init(struct pcmcia_socket *s)
{
unsigned long flags;
/* the good thing about SS_CAP_STATIC_MAP sockets is
* that they don't need a resource database */
spin_lock_irqsave(&s->lock, flags);
s->resource_setup_done = 1;
spin_unlock_irqrestore(&s->lock, flags);
return 0;
}
struct pccard_resource_ops pccard_static_ops = {
.validate_mem = NULL,
.adjust_io_region = NULL,
.find_io = NULL,
.find_mem = NULL,
.adjust_resource = NULL,
.init = static_init,
.exit = NULL,
};
EXPORT_SYMBOL(pccard_static_ops);
#ifdef CONFIG_PCCARD_IODYN
static struct resource *
make_resource(unsigned long b, unsigned long n, int flags, char *name)
{
struct resource *res = kzalloc(sizeof(*res), GFP_KERNEL);
if (res) {
res->name = name;
res->start = b;
res->end = b + n - 1;
res->flags = flags;
}
return res;
}
struct pcmcia_align_data {
unsigned long mask;
unsigned long offset;
};
static void pcmcia_align(void *align_data, struct resource *res,
unsigned long size, unsigned long align)
{
struct pcmcia_align_data *data = align_data;
unsigned long start;
start = (res->start & ~data->mask) + data->offset;
if (start < res->start)
start += data->mask + 1;
res->start = start;
#ifdef CONFIG_X86
if (res->flags & IORESOURCE_IO) {
if (start & 0x300) {
start = (start + 0x3ff) & ~0x3ff;
res->start = start;
}
}
#endif
#ifdef CONFIG_M68K
if (res->flags & IORESOURCE_IO) {
if ((res->start + size - 1) >= 1024)
res->start = res->end;
}
#endif
}
static int iodyn_adjust_io_region(struct resource *res, unsigned long r_start,
unsigned long r_end, struct pcmcia_socket *s)
{
return adjust_resource(res, r_start, r_end - r_start + 1);
}
static struct resource *iodyn_find_io_region(unsigned long base, int num,
unsigned long align, struct pcmcia_socket *s)
{
struct resource *res = make_resource(0, num, IORESOURCE_IO,
s->dev.class_id);
struct pcmcia_align_data data;
unsigned long min = base;
int ret;
if (align == 0)
align = 0x10000;
data.mask = align - 1;
data.offset = base & data.mask;
#ifdef CONFIG_PCI
if (s->cb_dev) {
ret = pci_bus_alloc_resource(s->cb_dev->bus, res, num, 1,
min, 0, pcmcia_align, &data);
} else
#endif
ret = allocate_resource(&ioport_resource, res, num, min, ~0UL,
1, pcmcia_align, &data);
if (ret != 0) {
kfree(res);
res = NULL;
}
return res;
}
struct pccard_resource_ops pccard_iodyn_ops = {
.validate_mem = NULL,
.adjust_io_region = iodyn_adjust_io_region,
.find_io = iodyn_find_io_region,
.find_mem = NULL,
.adjust_resource = NULL,
.init = static_init,
.exit = NULL,
};
EXPORT_SYMBOL(pccard_iodyn_ops);
#endif /* CONFIG_PCCARD_IODYN */