powerpc/44x: Support OCM(On Chip Memory) for APM821xx SoC and Bluestone board (c19d8248) · Commits · e / devices / android_kernel_samsung_universal8895

arch/powerpc/boot/dts/bluestone.dts

+8 −0

Original line number	Diff line number	Diff line
		@@ -107,6 +107,14 @@
		interrupt-parent = <&UIC0>;
		};

		OCM: ocm@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>;

arch/powerpc/include/asm/ppc4xx_ocm.h

0 → 100644

+45 −0

Original line number	Diff line number	Diff line
		/*
		* 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
		*/

		#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__ */

arch/powerpc/platforms/44x/Kconfig

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Original line number	Diff line number	Diff line
		@@ -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

arch/powerpc/sysdev/Makefile

+1 −0

Original line number	Diff line number	Diff line
		@@ -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

arch/powerpc/sysdev/ppc4xx_ocm.c

0 → 100644

+415 −0

Original line number	Diff line number	Diff line
		/*
		* 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);