Commit c438b58e authored by James Hogan's avatar James Hogan
Browse files

metag: TCM support



Add some TCM support
Signed-off-by: default avatarJames Hogan <james.hogan@imgtec.com>
parent bbc17704
#ifndef __ASM_METAG_MMZONE_H
#define __ASM_METAG_MMZONE_H
#ifdef CONFIG_NEED_MULTIPLE_NODES
#include <linux/numa.h>
extern struct pglist_data *node_data[];
#define NODE_DATA(nid) (node_data[nid])
static inline int pfn_to_nid(unsigned long pfn)
{
int nid;
for (nid = 0; nid < MAX_NUMNODES; nid++)
if (pfn >= node_start_pfn(nid) && pfn <= node_end_pfn(nid))
break;
return nid;
}
static inline struct pglist_data *pfn_to_pgdat(unsigned long pfn)
{
return NODE_DATA(pfn_to_nid(pfn));
}
/* arch/metag/mm/numa.c */
void __init setup_bootmem_node(int nid, unsigned long start, unsigned long end);
#else
static inline void
setup_bootmem_node(int nid, unsigned long start, unsigned long end)
{
}
#endif /* CONFIG_NEED_MULTIPLE_NODES */
#ifdef CONFIG_NUMA
/* SoC specific mem init */
void __init soc_mem_setup(void);
#else
static inline void __init soc_mem_setup(void) {};
#endif
#endif /* __ASM_METAG_MMZONE_H */
#ifndef __ASM_METAG_SPARSEMEM_H
#define __ASM_METAG_SPARSEMEM_H
/*
* SECTION_SIZE_BITS 2^N: how big each section will be
* MAX_PHYSADDR_BITS 2^N: how much physical address space we have
* MAX_PHYSMEM_BITS 2^N: how much memory we can have in that space
*/
#define SECTION_SIZE_BITS 26
#define MAX_PHYSADDR_BITS 32
#define MAX_PHYSMEM_BITS 32
#endif /* __ASM_METAG_SPARSEMEM_H */
#ifndef __ASM_TCM_H__
#define __ASM_TCM_H__
#include <linux/ioport.h>
#include <linux/list.h>
struct tcm_allocation {
struct list_head list;
unsigned int tag;
unsigned long addr;
unsigned long size;
};
/*
* TCM memory region descriptor.
*/
struct tcm_region {
unsigned int tag;
struct resource res;
};
#define TCM_INVALID_TAG 0xffffffff
unsigned long tcm_alloc(unsigned int tag, size_t len);
void tcm_free(unsigned int tag, unsigned long addr, size_t len);
unsigned int tcm_lookup_tag(unsigned long p);
int tcm_add_region(struct tcm_region *reg);
#endif
/*
* Copyright (C) 2010 Imagination Technologies Ltd.
*/
#include <linux/init.h>
#include <linux/kernel.h>
#include <linux/spinlock.h>
#include <linux/stddef.h>
#include <linux/genalloc.h>
#include <linux/string.h>
#include <linux/list.h>
#include <linux/slab.h>
#include <asm/page.h>
#include <asm/tcm.h>
struct tcm_pool {
struct list_head list;
unsigned int tag;
unsigned long start;
unsigned long end;
struct gen_pool *pool;
};
static LIST_HEAD(pool_list);
static struct tcm_pool *find_pool(unsigned int tag)
{
struct list_head *lh;
struct tcm_pool *pool;
list_for_each(lh, &pool_list) {
pool = list_entry(lh, struct tcm_pool, list);
if (pool->tag == tag)
return pool;
}
return NULL;
}
/**
* tcm_alloc - allocate memory from a TCM pool
* @tag: tag of the pool to allocate memory from
* @len: number of bytes to be allocated
*
* Allocate the requested number of bytes from the pool matching
* the specified tag. Returns the address of the allocated memory
* or zero on failure.
*/
unsigned long tcm_alloc(unsigned int tag, size_t len)
{
unsigned long vaddr;
struct tcm_pool *pool;
pool = find_pool(tag);
if (!pool)
return 0;
vaddr = gen_pool_alloc(pool->pool, len);
if (!vaddr)
return 0;
return vaddr;
}
/**
* tcm_free - free a block of memory to a TCM pool
* @tag: tag of the pool to free memory to
* @addr: address of the memory to be freed
* @len: number of bytes to be freed
*
* Free the requested number of bytes at a specific address to the
* pool matching the specified tag.
*/
void tcm_free(unsigned int tag, unsigned long addr, size_t len)
{
struct tcm_pool *pool;
pool = find_pool(tag);
if (!pool)
return;
gen_pool_free(pool->pool, addr, len);
}
/**
* tcm_lookup_tag - find the tag matching an address
* @p: memory address to lookup the tag for
*
* Find the tag of the tcm memory region that contains the
* specified address. Returns %TCM_INVALID_TAG if no such
* memory region could be found.
*/
unsigned int tcm_lookup_tag(unsigned long p)
{
struct list_head *lh;
struct tcm_pool *pool;
unsigned long addr = (unsigned long) p;
list_for_each(lh, &pool_list) {
pool = list_entry(lh, struct tcm_pool, list);
if (addr >= pool->start && addr < pool->end)
return pool->tag;
}
return TCM_INVALID_TAG;
}
/**
* tcm_add_region - add a memory region to TCM pool list
* @reg: descriptor of region to be added
*
* Add a region of memory to the TCM pool list. Returns 0 on success.
*/
int __init tcm_add_region(struct tcm_region *reg)
{
struct tcm_pool *pool;
pool = kmalloc(sizeof(*pool), GFP_KERNEL);
if (!pool) {
pr_err("Failed to alloc memory for TCM pool!\n");
return -ENOMEM;
}
pool->tag = reg->tag;
pool->start = reg->res.start;
pool->end = reg->res.end;
/*
* 2^3 = 8 bytes granularity to allow for 64bit access alignment.
* -1 = NUMA node specifier.
*/
pool->pool = gen_pool_create(3, -1);
if (!pool->pool) {
pr_err("Failed to create TCM pool!\n");
kfree(pool);
return -ENOMEM;
}
if (gen_pool_add(pool->pool, reg->res.start,
reg->res.end - reg->res.start + 1, -1)) {
pr_err("Failed to add memory to TCM pool!\n");
return -ENOMEM;
}
pr_info("Added %s TCM pool (%08x bytes @ %08x)\n",
reg->res.name, reg->res.end - reg->res.start + 1,
reg->res.start);
list_add_tail(&pool->list, &pool_list);
return 0;
}
/*
* Multiple memory node support for Meta machines
*
* Copyright (C) 2007 Paul Mundt
* Copyright (C) 2010 Imagination Technologies Ltd.
*
* This file is subject to the terms and conditions of the GNU General Public
* License. See the file "COPYING" in the main directory of this archive
* for more details.
*/
#include <linux/export.h>
#include <linux/bootmem.h>
#include <linux/memblock.h>
#include <linux/mm.h>
#include <linux/numa.h>
#include <linux/pfn.h>
#include <asm/sections.h>
struct pglist_data *node_data[MAX_NUMNODES] __read_mostly;
EXPORT_SYMBOL_GPL(node_data);
extern char _heap_start[];
/*
* On Meta machines the conventional approach is to stash system RAM
* in node 0, and other memory blocks in to node 1 and up, ordered by
* latency. Each node's pgdat is node-local at the beginning of the node,
* immediately followed by the node mem map.
*/
void __init setup_bootmem_node(int nid, unsigned long start, unsigned long end)
{
unsigned long bootmap_pages, bootmem_paddr;
unsigned long start_pfn, end_pfn;
unsigned long pgdat_paddr;
/* Don't allow bogus node assignment */
BUG_ON(nid > MAX_NUMNODES || nid <= 0);
start_pfn = start >> PAGE_SHIFT;
end_pfn = end >> PAGE_SHIFT;
memblock_add(start, end - start);
memblock_set_node(PFN_PHYS(start_pfn),
PFN_PHYS(end_pfn - start_pfn), nid);
/* Node-local pgdat */
pgdat_paddr = memblock_alloc_base(sizeof(struct pglist_data),
SMP_CACHE_BYTES, end);
NODE_DATA(nid) = __va(pgdat_paddr);
memset(NODE_DATA(nid), 0, sizeof(struct pglist_data));
NODE_DATA(nid)->bdata = &bootmem_node_data[nid];
NODE_DATA(nid)->node_start_pfn = start_pfn;
NODE_DATA(nid)->node_spanned_pages = end_pfn - start_pfn;
/* Node-local bootmap */
bootmap_pages = bootmem_bootmap_pages(end_pfn - start_pfn);
bootmem_paddr = memblock_alloc_base(bootmap_pages << PAGE_SHIFT,
PAGE_SIZE, end);
init_bootmem_node(NODE_DATA(nid), bootmem_paddr >> PAGE_SHIFT,
start_pfn, end_pfn);
free_bootmem_with_active_regions(nid, end_pfn);
/* Reserve the pgdat and bootmap space with the bootmem allocator */
reserve_bootmem_node(NODE_DATA(nid), pgdat_paddr & PAGE_MASK,
sizeof(struct pglist_data), BOOTMEM_DEFAULT);
reserve_bootmem_node(NODE_DATA(nid), bootmem_paddr,
bootmap_pages << PAGE_SHIFT, BOOTMEM_DEFAULT);
/* It's up */
node_set_online(nid);
/* Kick sparsemem */
sparse_memory_present_with_active_regions(nid);
}
void __init __weak soc_mem_setup(void)
{
}
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