diff options
Diffstat (limited to 'kernel/arch/powerpc/sysdev/ppc4xx_ocm.c')
| -rw-r--r-- | kernel/arch/powerpc/sysdev/ppc4xx_ocm.c | 416 |
1 files changed, 416 insertions, 0 deletions
diff --git a/kernel/arch/powerpc/sysdev/ppc4xx_ocm.c b/kernel/arch/powerpc/sysdev/ppc4xx_ocm.c new file mode 100644 index 000000000..85d9e37f5 --- /dev/null +++ b/kernel/arch/powerpc/sysdev/ppc4xx_ocm.c @@ -0,0 +1,416 @@ +/* + * 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); |