linux/arch/powerpc/sysdev/ppc4xx_ocm.c

416 lines
9.0 KiB
C

/*
* PowerPC 4xx OCM memory allocation support
*
* (C) Copyright 2009, Applied Micro Circuits Corporation
* Victor Gallardo (vgallardo@amcc.com)
*
* See file CREDITS for list of people who contributed to this
* project.
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License as
* published by the Free Software Foundation; either version 2 of
* the License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston,
* MA 02111-1307 USA
*/
#include <linux/kernel.h>
#include <linux/dma-mapping.h>
#include <linux/of.h>
#include <asm/rheap.h>
#include <asm/ppc4xx_ocm.h>
#include <linux/slab.h>
#include <linux/debugfs.h>
#define OCM_DISABLED 0
#define OCM_ENABLED 1
struct ocm_block {
struct list_head list;
void __iomem *addr;
int size;
const char *owner;
};
/* non-cached or cached region */
struct ocm_region {
phys_addr_t phys;
void __iomem *virt;
int memtotal;
int memfree;
rh_info_t *rh;
struct list_head list;
};
struct ocm_info {
int index;
int status;
int ready;
phys_addr_t phys;
int alignment;
int memtotal;
int cache_size;
struct ocm_region nc; /* non-cached region */
struct ocm_region c; /* cached region */
};
static struct ocm_info *ocm_nodes;
static int ocm_count;
static struct ocm_info *ocm_get_node(unsigned int index)
{
if (index >= ocm_count) {
printk(KERN_ERR "PPC4XX OCM: invalid index");
return NULL;
}
return &ocm_nodes[index];
}
static int ocm_free_region(struct ocm_region *ocm_reg, const void *addr)
{
struct ocm_block *blk, *tmp;
unsigned long offset;
if (!ocm_reg->virt)
return 0;
list_for_each_entry_safe(blk, tmp, &ocm_reg->list, list) {
if (blk->addr == addr) {
offset = addr - ocm_reg->virt;
ocm_reg->memfree += blk->size;
rh_free(ocm_reg->rh, offset);
list_del(&blk->list);
kfree(blk);
return 1;
}
}
return 0;
}
static void __init ocm_init_node(int count, struct device_node *node)
{
struct ocm_info *ocm;
const unsigned int *cell_index;
const unsigned int *cache_size;
int len;
struct resource rsrc;
int ioflags;
ocm = ocm_get_node(count);
cell_index = of_get_property(node, "cell-index", &len);
if (!cell_index) {
printk(KERN_ERR "PPC4XX OCM: missing cell-index property");
return;
}
ocm->index = *cell_index;
if (of_device_is_available(node))
ocm->status = OCM_ENABLED;
cache_size = of_get_property(node, "cached-region-size", &len);
if (cache_size)
ocm->cache_size = *cache_size;
if (of_address_to_resource(node, 0, &rsrc)) {
printk(KERN_ERR "PPC4XX OCM%d: could not get resource address\n",
ocm->index);
return;
}
ocm->phys = rsrc.start;
ocm->memtotal = (rsrc.end - rsrc.start + 1);
printk(KERN_INFO "PPC4XX OCM%d: %d Bytes (%s)\n",
ocm->index, ocm->memtotal,
(ocm->status == OCM_DISABLED) ? "disabled" : "enabled");
if (ocm->status == OCM_DISABLED)
return;
/* request region */
if (!request_mem_region(ocm->phys, ocm->memtotal, "ppc4xx_ocm")) {
printk(KERN_ERR "PPC4XX OCM%d: could not request region\n",
ocm->index);
return;
}
/* Configure non-cached and cached regions */
ocm->nc.phys = ocm->phys;
ocm->nc.memtotal = ocm->memtotal - ocm->cache_size;
ocm->nc.memfree = ocm->nc.memtotal;
ocm->c.phys = ocm->phys + ocm->nc.memtotal;
ocm->c.memtotal = ocm->cache_size;
ocm->c.memfree = ocm->c.memtotal;
if (ocm->nc.memtotal == 0)
ocm->nc.phys = 0;
if (ocm->c.memtotal == 0)
ocm->c.phys = 0;
printk(KERN_INFO "PPC4XX OCM%d: %d Bytes (non-cached)\n",
ocm->index, ocm->nc.memtotal);
printk(KERN_INFO "PPC4XX OCM%d: %d Bytes (cached)\n",
ocm->index, ocm->c.memtotal);
/* ioremap the non-cached region */
if (ocm->nc.memtotal) {
ioflags = _PAGE_NO_CACHE | _PAGE_GUARDED | _PAGE_EXEC;
ocm->nc.virt = __ioremap(ocm->nc.phys, ocm->nc.memtotal,
ioflags);
if (!ocm->nc.virt) {
printk(KERN_ERR
"PPC4XX OCM%d: failed to ioremap non-cached memory\n",
ocm->index);
ocm->nc.memfree = 0;
return;
}
}
/* ioremap the cached region */
if (ocm->c.memtotal) {
ioflags = _PAGE_EXEC;
ocm->c.virt = __ioremap(ocm->c.phys, ocm->c.memtotal,
ioflags);
if (!ocm->c.virt) {
printk(KERN_ERR
"PPC4XX OCM%d: failed to ioremap cached memory\n",
ocm->index);
ocm->c.memfree = 0;
return;
}
}
/* Create Remote Heaps */
ocm->alignment = 4; /* default 4 byte alignment */
if (ocm->nc.virt) {
ocm->nc.rh = rh_create(ocm->alignment);
rh_attach_region(ocm->nc.rh, 0, ocm->nc.memtotal);
}
if (ocm->c.virt) {
ocm->c.rh = rh_create(ocm->alignment);
rh_attach_region(ocm->c.rh, 0, ocm->c.memtotal);
}
INIT_LIST_HEAD(&ocm->nc.list);
INIT_LIST_HEAD(&ocm->c.list);
ocm->ready = 1;
return;
}
static int ocm_debugfs_show(struct seq_file *m, void *v)
{
struct ocm_block *blk, *tmp;
unsigned int i;
for (i = 0; i < ocm_count; i++) {
struct ocm_info *ocm = ocm_get_node(i);
if (!ocm || !ocm->ready)
continue;
seq_printf(m, "PPC4XX OCM : %d\n", ocm->index);
seq_printf(m, "PhysAddr : 0x%llx\n", ocm->phys);
seq_printf(m, "MemTotal : %d Bytes\n", ocm->memtotal);
seq_printf(m, "MemTotal(NC) : %d Bytes\n", ocm->nc.memtotal);
seq_printf(m, "MemTotal(C) : %d Bytes\n", ocm->c.memtotal);
seq_printf(m, "\n");
seq_printf(m, "NC.PhysAddr : 0x%llx\n", ocm->nc.phys);
seq_printf(m, "NC.VirtAddr : 0x%p\n", ocm->nc.virt);
seq_printf(m, "NC.MemTotal : %d Bytes\n", ocm->nc.memtotal);
seq_printf(m, "NC.MemFree : %d Bytes\n", ocm->nc.memfree);
list_for_each_entry_safe(blk, tmp, &ocm->nc.list, list) {
seq_printf(m, "NC.MemUsed : %d Bytes (%s)\n",
blk->size, blk->owner);
}
seq_printf(m, "\n");
seq_printf(m, "C.PhysAddr : 0x%llx\n", ocm->c.phys);
seq_printf(m, "C.VirtAddr : 0x%p\n", ocm->c.virt);
seq_printf(m, "C.MemTotal : %d Bytes\n", ocm->c.memtotal);
seq_printf(m, "C.MemFree : %d Bytes\n", ocm->c.memfree);
list_for_each_entry_safe(blk, tmp, &ocm->c.list, list) {
seq_printf(m, "C.MemUsed : %d Bytes (%s)\n",
blk->size, blk->owner);
}
seq_printf(m, "\n");
}
return 0;
}
static int ocm_debugfs_open(struct inode *inode, struct file *file)
{
return single_open(file, ocm_debugfs_show, NULL);
}
static const struct file_operations ocm_debugfs_fops = {
.open = ocm_debugfs_open,
.read = seq_read,
.llseek = seq_lseek,
.release = single_release,
};
static int ocm_debugfs_init(void)
{
struct dentry *junk;
junk = debugfs_create_dir("ppc4xx_ocm", 0);
if (!junk) {
printk(KERN_ALERT "debugfs ppc4xx ocm: failed to create dir\n");
return -1;
}
if (debugfs_create_file("info", 0644, junk, NULL, &ocm_debugfs_fops)) {
printk(KERN_ALERT "debugfs ppc4xx ocm: failed to create file\n");
return -1;
}
return 0;
}
void *ppc4xx_ocm_alloc(phys_addr_t *phys, int size, int align,
int flags, const char *owner)
{
void __iomem *addr = NULL;
unsigned long offset;
struct ocm_info *ocm;
struct ocm_region *ocm_reg;
struct ocm_block *ocm_blk;
int i;
for (i = 0; i < ocm_count; i++) {
ocm = ocm_get_node(i);
if (!ocm || !ocm->ready)
continue;
if (flags == PPC4XX_OCM_NON_CACHED)
ocm_reg = &ocm->nc;
else
ocm_reg = &ocm->c;
if (!ocm_reg->virt)
continue;
if (align < ocm->alignment)
align = ocm->alignment;
offset = rh_alloc_align(ocm_reg->rh, size, align, NULL);
if (IS_ERR_VALUE(offset))
continue;
ocm_blk = kzalloc(sizeof(struct ocm_block *), GFP_KERNEL);
if (!ocm_blk) {
printk(KERN_ERR "PPC4XX OCM: could not allocate ocm block");
rh_free(ocm_reg->rh, offset);
break;
}
*phys = ocm_reg->phys + offset;
addr = ocm_reg->virt + offset;
size = ALIGN(size, align);
ocm_blk->addr = addr;
ocm_blk->size = size;
ocm_blk->owner = owner;
list_add_tail(&ocm_blk->list, &ocm_reg->list);
ocm_reg->memfree -= size;
break;
}
return addr;
}
void ppc4xx_ocm_free(const void *addr)
{
int i;
if (!addr)
return;
for (i = 0; i < ocm_count; i++) {
struct ocm_info *ocm = ocm_get_node(i);
if (!ocm || !ocm->ready)
continue;
if (ocm_free_region(&ocm->nc, addr) ||
ocm_free_region(&ocm->c, addr))
return;
}
}
static int __init ppc4xx_ocm_init(void)
{
struct device_node *np;
int count;
count = 0;
for_each_compatible_node(np, NULL, "ibm,ocm")
count++;
if (!count)
return 0;
ocm_nodes = kzalloc((count * sizeof(struct ocm_info)), GFP_KERNEL);
if (!ocm_nodes) {
printk(KERN_ERR "PPC4XX OCM: failed to allocate OCM nodes!\n");
return -ENOMEM;
}
ocm_count = count;
count = 0;
for_each_compatible_node(np, NULL, "ibm,ocm") {
ocm_init_node(count, np);
count++;
}
ocm_debugfs_init();
return 0;
}
arch_initcall(ppc4xx_ocm_init);