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author | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-27 10:05:51 +0000 |
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committer | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-27 10:05:51 +0000 |
commit | 5d1646d90e1f2cceb9f0828f4b28318cd0ec7744 (patch) | |
tree | a94efe259b9009378be6d90eb30d2b019d95c194 /arch/m68k/amiga/chipram.c | |
parent | Initial commit. (diff) | |
download | linux-upstream.tar.xz linux-upstream.zip |
Adding upstream version 5.10.209.upstream/5.10.209upstream
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'arch/m68k/amiga/chipram.c')
-rw-r--r-- | arch/m68k/amiga/chipram.c | 124 |
1 files changed, 124 insertions, 0 deletions
diff --git a/arch/m68k/amiga/chipram.c b/arch/m68k/amiga/chipram.c new file mode 100644 index 000000000..a537953bc --- /dev/null +++ b/arch/m68k/amiga/chipram.c @@ -0,0 +1,124 @@ +// SPDX-License-Identifier: GPL-2.0 +/* +** 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); + |