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124 lines
2.6 KiB
124 lines
2.6 KiB
// SPDX-License-Identifier: GPL-2.0 |
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/* |
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** linux/amiga/chipram.c |
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** |
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** Modified 03-May-94 by Geert Uytterhoeven <[email protected]> |
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** - 64-bit aligned allocations for full AGA compatibility |
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** |
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** Rewritten 15/9/2000 by Geert to use resource management |
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*/ |
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#include <linux/types.h> |
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#include <linux/kernel.h> |
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#include <linux/mm.h> |
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#include <linux/init.h> |
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#include <linux/ioport.h> |
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#include <linux/slab.h> |
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#include <linux/string.h> |
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#include <linux/module.h> |
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#include <asm/atomic.h> |
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#include <asm/page.h> |
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#include <asm/amigahw.h> |
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unsigned long amiga_chip_size; |
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EXPORT_SYMBOL(amiga_chip_size); |
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static struct resource chipram_res = { |
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.name = "Chip RAM", .start = CHIP_PHYSADDR |
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}; |
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static atomic_t chipavail; |
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void __init amiga_chip_init(void) |
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{ |
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if (!AMIGAHW_PRESENT(CHIP_RAM)) |
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return; |
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chipram_res.end = CHIP_PHYSADDR + amiga_chip_size - 1; |
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request_resource(&iomem_resource, &chipram_res); |
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atomic_set(&chipavail, amiga_chip_size); |
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} |
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void *amiga_chip_alloc(unsigned long size, const char *name) |
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{ |
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struct resource *res; |
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void *p; |
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res = kzalloc(sizeof(struct resource), GFP_KERNEL); |
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if (!res) |
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return NULL; |
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res->name = name; |
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p = amiga_chip_alloc_res(size, res); |
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if (!p) { |
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kfree(res); |
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return NULL; |
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} |
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return p; |
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} |
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EXPORT_SYMBOL(amiga_chip_alloc); |
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/* |
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* Warning: |
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* amiga_chip_alloc_res is meant only for drivers that need to |
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* allocate Chip RAM before kmalloc() is functional. As a consequence, |
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* those drivers must not free that Chip RAM afterwards. |
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*/ |
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void *amiga_chip_alloc_res(unsigned long size, struct resource *res) |
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{ |
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int error; |
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/* round up */ |
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size = PAGE_ALIGN(size); |
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pr_debug("amiga_chip_alloc_res: allocate %lu bytes\n", size); |
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error = allocate_resource(&chipram_res, res, size, 0, UINT_MAX, |
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PAGE_SIZE, NULL, NULL); |
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if (error < 0) { |
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pr_err("amiga_chip_alloc_res: allocate_resource() failed %d!\n", |
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error); |
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return NULL; |
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} |
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atomic_sub(size, &chipavail); |
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pr_debug("amiga_chip_alloc_res: returning %pR\n", res); |
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return ZTWO_VADDR(res->start); |
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} |
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void amiga_chip_free(void *ptr) |
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{ |
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unsigned long start = ZTWO_PADDR(ptr); |
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struct resource *res; |
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unsigned long size; |
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res = lookup_resource(&chipram_res, start); |
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if (!res) { |
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pr_err("amiga_chip_free: trying to free nonexistent region at " |
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"%p\n", ptr); |
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return; |
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} |
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size = resource_size(res); |
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pr_debug("amiga_chip_free: free %lu bytes at %p\n", size, ptr); |
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atomic_add(size, &chipavail); |
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release_resource(res); |
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kfree(res); |
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} |
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EXPORT_SYMBOL(amiga_chip_free); |
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unsigned long amiga_chip_avail(void) |
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{ |
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unsigned long n = atomic_read(&chipavail); |
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pr_debug("amiga_chip_avail : %lu bytes\n", n); |
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return n; |
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} |
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EXPORT_SYMBOL(amiga_chip_avail); |
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