124 lines
2.6 KiB
C
124 lines
2.6 KiB
C
/*
|
|
** linux/amiga/chipram.c
|
|
**
|
|
** Modified 03-May-94 by Geert Uytterhoeven <geert@linux-m68k.org>
|
|
** - 64-bit aligned allocations for full AGA compatibility
|
|
**
|
|
** Rewritten 15/9/2000 by Geert to use resource management
|
|
*/
|
|
|
|
#include <linux/types.h>
|
|
#include <linux/kernel.h>
|
|
#include <linux/mm.h>
|
|
#include <linux/init.h>
|
|
#include <linux/ioport.h>
|
|
#include <linux/slab.h>
|
|
#include <linux/string.h>
|
|
#include <linux/module.h>
|
|
|
|
#include <asm/atomic.h>
|
|
#include <asm/page.h>
|
|
#include <asm/amigahw.h>
|
|
|
|
unsigned long amiga_chip_size;
|
|
EXPORT_SYMBOL(amiga_chip_size);
|
|
|
|
static struct resource chipram_res = {
|
|
.name = "Chip RAM", .start = CHIP_PHYSADDR
|
|
};
|
|
static atomic_t chipavail;
|
|
|
|
|
|
void __init amiga_chip_init(void)
|
|
{
|
|
if (!AMIGAHW_PRESENT(CHIP_RAM))
|
|
return;
|
|
|
|
chipram_res.end = CHIP_PHYSADDR + amiga_chip_size - 1;
|
|
request_resource(&iomem_resource, &chipram_res);
|
|
|
|
atomic_set(&chipavail, amiga_chip_size);
|
|
}
|
|
|
|
|
|
void *amiga_chip_alloc(unsigned long size, const char *name)
|
|
{
|
|
struct resource *res;
|
|
void *p;
|
|
|
|
res = kzalloc(sizeof(struct resource), GFP_KERNEL);
|
|
if (!res)
|
|
return NULL;
|
|
|
|
res->name = name;
|
|
p = amiga_chip_alloc_res(size, res);
|
|
if (!p) {
|
|
kfree(res);
|
|
return NULL;
|
|
}
|
|
|
|
return p;
|
|
}
|
|
EXPORT_SYMBOL(amiga_chip_alloc);
|
|
|
|
|
|
/*
|
|
* Warning:
|
|
* amiga_chip_alloc_res is meant only for drivers that need to
|
|
* allocate Chip RAM before kmalloc() is functional. As a consequence,
|
|
* those drivers must not free that Chip RAM afterwards.
|
|
*/
|
|
|
|
void *amiga_chip_alloc_res(unsigned long size, struct resource *res)
|
|
{
|
|
int error;
|
|
|
|
/* round up */
|
|
size = PAGE_ALIGN(size);
|
|
|
|
pr_debug("amiga_chip_alloc_res: allocate %lu bytes\n", size);
|
|
error = allocate_resource(&chipram_res, res, size, 0, UINT_MAX,
|
|
PAGE_SIZE, NULL, NULL);
|
|
if (error < 0) {
|
|
pr_err("amiga_chip_alloc_res: allocate_resource() failed %d!\n",
|
|
error);
|
|
return NULL;
|
|
}
|
|
|
|
atomic_sub(size, &chipavail);
|
|
pr_debug("amiga_chip_alloc_res: returning %pR\n", res);
|
|
return ZTWO_VADDR(res->start);
|
|
}
|
|
|
|
void amiga_chip_free(void *ptr)
|
|
{
|
|
unsigned long start = ZTWO_PADDR(ptr);
|
|
struct resource *res;
|
|
unsigned long size;
|
|
|
|
res = lookup_resource(&chipram_res, start);
|
|
if (!res) {
|
|
pr_err("amiga_chip_free: trying to free nonexistent region at "
|
|
"%p\n", ptr);
|
|
return;
|
|
}
|
|
|
|
size = resource_size(res);
|
|
pr_debug("amiga_chip_free: free %lu bytes at %p\n", size, ptr);
|
|
atomic_add(size, &chipavail);
|
|
release_resource(res);
|
|
kfree(res);
|
|
}
|
|
EXPORT_SYMBOL(amiga_chip_free);
|
|
|
|
|
|
unsigned long amiga_chip_avail(void)
|
|
{
|
|
unsigned long n = atomic_read(&chipavail);
|
|
|
|
pr_debug("amiga_chip_avail : %lu bytes\n", n);
|
|
return n;
|
|
}
|
|
EXPORT_SYMBOL(amiga_chip_avail);
|
|
|