mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2024-08-21 16:29:59 +00:00
![Vinh Nguyen Huu Tuong](/assets/img/avatar_default.png)
This patch consists of: - Add driver for OCM component - Export OCM Information at /sys/kernel/debug/ppc4xx_ocm/info Signed-off-by: Vinh Nguyen Huu Tuong <vhtnguyen@apm.com> Acked-by: Josh Boyer <jwboyer@gmail.com> Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
415 lines
9 KiB
C
415 lines
9 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);
|