[PATCH] powerpc/44x: Support OCM(On Chip Memory) for APM821xx SoC and Bluestone board
Josh Boyer
jwboyer at gmail.com
Wed Aug 8 22:23:21 EST 2012
On Tue, Jul 3, 2012 at 4:52 AM, Vinh Nguyen Huu Tuong <vhtnguyen at apm.com> wrote:
> 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 at apm.com>
Acked-by: Josh Boyer <jwboyer at gmail.com>
Ben, could you pick this up? I have nothing else queued in the 4xx
tree at all.
josh
> ---
> arch/powerpc/boot/dts/bluestone.dts | 8 +
> arch/powerpc/include/asm/ppc4xx_ocm.h | 45 ++++
> arch/powerpc/platforms/44x/Kconfig | 8 +
> arch/powerpc/sysdev/Makefile | 1 +
> arch/powerpc/sysdev/ppc4xx_ocm.c | 415 +++++++++++++++++++++++++++++++++
> 5 files changed, 477 insertions(+), 0 deletions(-)
> create mode 100644 arch/powerpc/include/asm/ppc4xx_ocm.h
> create mode 100644 arch/powerpc/sysdev/ppc4xx_ocm.c
>
> diff --git a/arch/powerpc/boot/dts/bluestone.dts b/arch/powerpc/boot/dts/bluestone.dts
> index 9d4917a..7daaca3 100644
> --- a/arch/powerpc/boot/dts/bluestone.dts
> +++ b/arch/powerpc/boot/dts/bluestone.dts
> @@ -107,6 +107,14 @@
> interrupt-parent = <&UIC0>;
> };
>
> + OCM: ocm at 400040000 {
> + compatible = "ibm,ocm";
> + status = "ok";
> + cell-index = <1>;
> + /* configured in U-Boot */
> + reg = <4 0x00040000 0x8000>; /* 32K */
> + };
> +
> SDR0: sdr {
> compatible = "ibm,sdr-apm821xx";
> dcr-reg = <0x00e 0x002>;
> diff --git a/arch/powerpc/include/asm/ppc4xx_ocm.h b/arch/powerpc/include/asm/ppc4xx_ocm.h
> new file mode 100644
> index 0000000..6ce9046
> --- /dev/null
> +++ b/arch/powerpc/include/asm/ppc4xx_ocm.h
> @@ -0,0 +1,45 @@
> +/*
> + * PowerPC 4xx OCM memory allocation support
> + *
> + * (C) Copyright 2009, Applied Micro Circuits Corporation
> + * Victor Gallardo (vgallardo at 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
> + */
> +
> +#ifndef __ASM_POWERPC_PPC4XX_OCM_H__
> +#define __ASM_POWERPC_PPC4XX_OCM_H__
> +
> +#define PPC4XX_OCM_NON_CACHED 0
> +#define PPC4XX_OCM_CACHED 1
> +
> +#if defined(CONFIG_PPC4xx_OCM)
> +
> +void *ppc4xx_ocm_alloc(phys_addr_t *phys, int size, int align,
> + int flags, const char *owner);
> +void ppc4xx_ocm_free(const void *virt);
> +
> +#else
> +
> +#define ppc4xx_ocm_alloc(phys, size, align, flags, owner) NULL
> +#define ppc4xx_ocm_free(addr) ((void)0)
> +
> +#endif /* CONFIG_PPC4xx_OCM */
> +
> +#endif /* __ASM_POWERPC_PPC4XX_OCM_H__ */
> diff --git a/arch/powerpc/platforms/44x/Kconfig b/arch/powerpc/platforms/44x/Kconfig
> index 8abf6fb8..0effe9f 100644
> --- a/arch/powerpc/platforms/44x/Kconfig
> +++ b/arch/powerpc/platforms/44x/Kconfig
> @@ -252,6 +252,14 @@ config PPC4xx_GPIO
> help
> Enable gpiolib support for ppc440 based boards
>
> +config PPC4xx_OCM
> + bool "PPC4xx On Chip Memory (OCM) support"
> + depends on 4xx
> + select PPC_LIB_RHEAP
> + help
> + Enable OCM support for PowerPC 4xx platforms with on chip memory,
> + OCM provides the fast place for memory access to improve performance.
> +
> # 44x specific CPU modules, selected based on the board above.
> config 440EP
> bool
> diff --git a/arch/powerpc/sysdev/Makefile b/arch/powerpc/sysdev/Makefile
> index 1bd7ecb..6f768e2 100644
> --- a/arch/powerpc/sysdev/Makefile
> +++ b/arch/powerpc/sysdev/Makefile
> @@ -37,6 +37,7 @@ obj-$(CONFIG_PPC_INDIRECT_PCI) += indirect_pci.o
> obj-$(CONFIG_PPC_I8259) += i8259.o
> obj-$(CONFIG_IPIC) += ipic.o
> obj-$(CONFIG_4xx) += uic.o
> +obj-$(CONFIG_PPC4xx_OCM) += ppc4xx_ocm.o
> obj-$(CONFIG_4xx_SOC) += ppc4xx_soc.o
> obj-$(CONFIG_XILINX_VIRTEX) += xilinx_intc.o
> obj-$(CONFIG_XILINX_PCI) += xilinx_pci.o
> diff --git a/arch/powerpc/sysdev/ppc4xx_ocm.c b/arch/powerpc/sysdev/ppc4xx_ocm.c
> new file mode 100644
> index 0000000..1b15f93
> --- /dev/null
> +++ b/arch/powerpc/sysdev/ppc4xx_ocm.c
> @@ -0,0 +1,415 @@
> +/*
> + * PowerPC 4xx OCM memory allocation support
> + *
> + * (C) Copyright 2009, Applied Micro Circuits Corporation
> + * Victor Gallardo (vgallardo at 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);
> --
> 1.7.2.5
>
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