[mirror_ubuntu-jammy-kernel.git] / arch / cris / arch-v32 / mm / intmem.c

/*
 * Simple allocator for internal RAM in ETRAX FS
 *
 * Copyright (c) 2004 Axis Communications AB.
 */

#include <linux/list.h>
#include <linux/slab.h>
#include <asm/io.h>
#include <memmap.h>

#define STATUS_FREE 0
#define STATUS_ALLOCATED 1

#ifdef CONFIG_ETRAX_L2CACHE
#define RESERVED_SIZE 66*1024
#else
#define RESERVED_SIZE 0
#endif

struct intmem_allocation {
	struct list_head entry;
	unsigned int size;
	unsigned offset;
	char status;
};


static struct list_head intmem_allocations;
static void* intmem_virtual;

static void crisv32_intmem_init(void)
{
	static int initiated = 0;
	if (!initiated) {
		struct intmem_allocation* alloc =
		  (struct intmem_allocation*)kmalloc(sizeof *alloc, GFP_KERNEL);
		INIT_LIST_HEAD(&intmem_allocations);
		intmem_virtual = ioremap(MEM_INTMEM_START + RESERVED_SIZE,
					 MEM_INTMEM_SIZE - RESERVED_SIZE);
		initiated = 1;
		alloc->size = MEM_INTMEM_SIZE - RESERVED_SIZE;
		alloc->offset = 0;
		alloc->status = STATUS_FREE;
		list_add_tail(&alloc->entry, &intmem_allocations);
	}
}

void* crisv32_intmem_alloc(unsigned size, unsigned align)
{
	struct intmem_allocation* allocation;
	struct intmem_allocation* tmp;
	void* ret = NULL;

	preempt_disable();
	crisv32_intmem_init();

	list_for_each_entry_safe(allocation, tmp, &intmem_allocations, entry) {
		int alignment = allocation->offset % align;
		alignment = alignment ? align - alignment : alignment;

		if (allocation->status == STATUS_FREE &&
		    allocation->size >= size + alignment) {
			if (allocation->size > size + alignment) {
				struct intmem_allocation* alloc =
					(struct intmem_allocation*)
					kmalloc(sizeof *alloc, GFP_ATOMIC);
				alloc->status = STATUS_FREE;
				alloc->size = allocation->size - size -
					alignment;
				alloc->offset = allocation->offset + size +
					alignment;
				list_add(&alloc->entry, &allocation->entry);

				if (alignment) {
					struct intmem_allocation *tmp;
					tmp = (struct intmem_allocation *)
						kmalloc(sizeof *tmp,
							GFP_ATOMIC);
					tmp->offset = allocation->offset;
					tmp->size = alignment;
					tmp->status = STATUS_FREE;
					allocation->offset += alignment;
					list_add_tail(&tmp->entry,
						&allocation->entry);
				}
			}
			allocation->status = STATUS_ALLOCATED;
			allocation->size = size;
			ret = (void*)((int)intmem_virtual + allocation->offset);
		}
	}
	preempt_enable();
	return ret;
}

void crisv32_intmem_free(void* addr)
{
	struct intmem_allocation* allocation;
	struct intmem_allocation* tmp;

	if (addr == NULL)
		return;

	preempt_disable();
	crisv32_intmem_init();

	list_for_each_entry_safe(allocation, tmp, &intmem_allocations, entry) {
		if (allocation->offset == (int)(addr - intmem_virtual)) {
			struct intmem_allocation *prev =
			  list_entry(allocation->entry.prev,
			             struct intmem_allocation, entry);
			struct intmem_allocation *next =
			  list_entry(allocation->entry.next,
				     struct intmem_allocation, entry);

			allocation->status = STATUS_FREE;
			/* Join with prev and/or next if also free */
			if ((prev != &intmem_allocations) &&
					(prev->status == STATUS_FREE)) {
				prev->size += allocation->size;
				list_del(&allocation->entry);
				kfree(allocation);
				allocation = prev;
			}
			if ((next != &intmem_allocations) &&
					(next->status == STATUS_FREE)) {
				allocation->size += next->size;
				list_del(&next->entry);
				kfree(next);
			}
			preempt_enable();
			return;
		}
	}
	preempt_enable();
}

void* crisv32_intmem_phys_to_virt(unsigned long addr)
{
	return (void *)(addr - (MEM_INTMEM_START + RESERVED_SIZE) +
		(unsigned long)intmem_virtual);
}

unsigned long crisv32_intmem_virt_to_phys(void* addr)
{
	return (unsigned long)((unsigned long )addr -
		(unsigned long)intmem_virtual + MEM_INTMEM_START +
		RESERVED_SIZE);
}

module_init(crisv32_intmem_init);
Commit	Line	Data
51533b61 MS	1	/*
	2	* Simple allocator for internal RAM in ETRAX FS
	3	*
	4	* Copyright (c) 2004 Axis Communications AB.
	5	*/
	6
	7	#include <linux/list.h>
	8	#include <linux/slab.h>
	9	#include <asm/io.h>
108ecfbc	10	#include <memmap.h>
51533b61 MS	11
	12	#define STATUS_FREE 0
	13	#define STATUS_ALLOCATED 1
	14
108ecfbc JN	15	#ifdef CONFIG_ETRAX_L2CACHE
	16	#define RESERVED_SIZE 66*1024
	17	#else
	18	#define RESERVED_SIZE 0
	19	#endif
	20
51533b61 MS	21	struct intmem_allocation {
	22	struct list_head entry;
	23	unsigned int size;
	24	unsigned offset;
	25	char status;
	26	};
	27
	28
	29	static struct list_head intmem_allocations;
	30	static void* intmem_virtual;
	31
	32	static void crisv32_intmem_init(void)
	33	{
	34	static int initiated = 0;
	35	if (!initiated) {
	36	struct intmem_allocation* alloc =
	37	(struct intmem_allocation)kmalloc(sizeof alloc, GFP_KERNEL);
	38	INIT_LIST_HEAD(&intmem_allocations);
108ecfbc JN	39	intmem_virtual = ioremap(MEM_INTMEM_START + RESERVED_SIZE,
108ecfbc JN	40	MEM_INTMEM_SIZE - RESERVED_SIZE);
51533b61	41	initiated = 1;
108ecfbc	42	alloc->size = MEM_INTMEM_SIZE - RESERVED_SIZE;
51533b61 MS	43	alloc->offset = 0;
	44	alloc->status = STATUS_FREE;
	45	list_add_tail(&alloc->entry, &intmem_allocations);
	46	}
	47	}
	48
	49	void* crisv32_intmem_alloc(unsigned size, unsigned align)
	50	{
	51	struct intmem_allocation* allocation;
	52	struct intmem_allocation* tmp;
	53	void* ret = NULL;
	54
	55	preempt_disable();
	56	crisv32_intmem_init();
	57
	58	list_for_each_entry_safe(allocation, tmp, &intmem_allocations, entry) {
	59	int alignment = allocation->offset % align;
	60	alignment = alignment ? align - alignment : alignment;
	61
	62	if (allocation->status == STATUS_FREE &&
	63	allocation->size >= size + alignment) {
	64	if (allocation->size > size + alignment) {
	65	struct intmem_allocation* alloc =
	66	(struct intmem_allocation*)
	67	kmalloc(sizeof *alloc, GFP_ATOMIC);
	68	alloc->status = STATUS_FREE;
108ecfbc JN	69	alloc->size = allocation->size - size -
	70	alignment;
	71	alloc->offset = allocation->offset + size +
	72	alignment;
51533b61 MS	73	list_add(&alloc->entry, &allocation->entry);
	74
	75	if (alignment) {
108ecfbc JN	76	struct intmem_allocation *tmp;
	77	tmp = (struct intmem_allocation *)
	78	kmalloc(sizeof *tmp,
	79	GFP_ATOMIC);
51533b61 MS	80	tmp->offset = allocation->offset;
	81	tmp->size = alignment;
	82	tmp->status = STATUS_FREE;
	83	allocation->offset += alignment;
108ecfbc JN	84	list_add_tail(&tmp->entry,
108ecfbc JN	85	&allocation->entry);
51533b61 MS	86	}
	87	}
	88	allocation->status = STATUS_ALLOCATED;
	89	allocation->size = size;
	90	ret = (void*)((int)intmem_virtual + allocation->offset);
	91	}
	92	}
	93	preempt_enable();
	94	return ret;
	95	}
	96
	97	void crisv32_intmem_free(void* addr)
	98	{
	99	struct intmem_allocation* allocation;
	100	struct intmem_allocation* tmp;
	101
	102	if (addr == NULL)
	103	return;
	104
	105	preempt_disable();
	106	crisv32_intmem_init();
	107
	108	list_for_each_entry_safe(allocation, tmp, &intmem_allocations, entry) {
	109	if (allocation->offset == (int)(addr - intmem_virtual)) {
108ecfbc	110	struct intmem_allocation *prev =
51533b61 MS	111	list_entry(allocation->entry.prev,
51533b61 MS	112	struct intmem_allocation, entry);
108ecfbc	113	struct intmem_allocation *next =
51533b61 MS	114	list_entry(allocation->entry.next,
	115	struct intmem_allocation, entry);
	116
	117	allocation->status = STATUS_FREE;
	118	/* Join with prev and/or next if also free */
108ecfbc JN	119	if ((prev != &intmem_allocations) &&
108ecfbc JN	120	(prev->status == STATUS_FREE)) {
51533b61 MS	121	prev->size += allocation->size;
	122	list_del(&allocation->entry);
	123	kfree(allocation);
	124	allocation = prev;
	125	}
108ecfbc JN	126	if ((next != &intmem_allocations) &&
108ecfbc JN	127	(next->status == STATUS_FREE)) {
51533b61 MS	128	allocation->size += next->size;
	129	list_del(&next->entry);
	130	kfree(next);
	131	}
	132	preempt_enable();
	133	return;
	134	}
	135	}
	136	preempt_enable();
	137	}
	138
	139	void* crisv32_intmem_phys_to_virt(unsigned long addr)
	140	{
108ecfbc JN	141	return (void *)(addr - (MEM_INTMEM_START + RESERVED_SIZE) +
108ecfbc JN	142	(unsigned long)intmem_virtual);
51533b61 MS	143	}
	144
	145	unsigned long crisv32_intmem_virt_to_phys(void* addr)
	146	{
	147	return (unsigned long)((unsigned long )addr -
108ecfbc JN	148	(unsigned long)intmem_virtual + MEM_INTMEM_START +
108ecfbc JN	149	RESERVED_SIZE);
51533b61 MS	150	}
51533b61 MS	151
108ecfbc	152	module_init(crisv32_intmem_init);
51533b61	153