--- /dev/null
+/*
+ * 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 <linux/of_address.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);
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