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authorLeo Yan <leoy@marvell.com>2011-08-15 11:09:52 +0800
committerEric Miao <eric.y.miao@gmail.com>2011-10-25 20:29:20 +0800
commit3c7241bd36e2a618fe20c91f6c69cc20f2d981f2 (patch)
tree90d777c71c914d5ec252d252f84944f52bb475a5 /arch/arm
parentc3b92c8787367a8bb53d57d9789b558f1295cc96 (diff)
downloadlinux-3c7241bd36e2a618fe20c91f6c69cc20f2d981f2.tar.bz2
ARM: mmp: add sram allocator
On mmp platform, there have two sram banks: audio sram and internal sram. The audio sram is mainly for audio; the internal sram is for video, wtm and power management. So add the sram allocator using genalloc to manage them. Every sram bank will register its own platform device info, after the sram allocator create the generic pool for the sram bank, the user module can use the pool's name to get the pool handler; then it can use the handler to alloc/free memory with genalloc APIs. Signed-off-by: Leo Yan <leoy@marvell.com> Acked-by: Haojian Zhuang <haojian.zhuang@gmail.com> Signed-off-by: Eric Miao <eric.y.miao@gmail.com>
Diffstat (limited to 'arch/arm')
-rw-r--r--arch/arm/Kconfig1
-rw-r--r--arch/arm/mach-mmp/Makefile2
-rw-r--r--arch/arm/mach-mmp/include/mach/sram.h35
-rw-r--r--arch/arm/mach-mmp/sram.c168
4 files changed, 205 insertions, 1 deletions
diff --git a/arch/arm/Kconfig b/arch/arm/Kconfig
index 3146ed3f6eca..f03ccaec9701 100644
--- a/arch/arm/Kconfig
+++ b/arch/arm/Kconfig
@@ -558,6 +558,7 @@ config ARCH_MMP
select TICK_ONESHOT
select PLAT_PXA
select SPARSE_IRQ
+ select GENERIC_ALLOCATOR
help
Support for Marvell's PXA168/PXA910(MMP) and MMP2 processor line.
diff --git a/arch/arm/mach-mmp/Makefile b/arch/arm/mach-mmp/Makefile
index b0ac942327aa..169c6743bde8 100644
--- a/arch/arm/mach-mmp/Makefile
+++ b/arch/arm/mach-mmp/Makefile
@@ -7,7 +7,7 @@ obj-y += common.o clock.o devices.o time.o
# SoC support
obj-$(CONFIG_CPU_PXA168) += pxa168.o irq-pxa168.o
obj-$(CONFIG_CPU_PXA910) += pxa910.o irq-pxa168.o
-obj-$(CONFIG_CPU_MMP2) += mmp2.o irq-mmp2.o
+obj-$(CONFIG_CPU_MMP2) += mmp2.o irq-mmp2.o sram.o
# board support
obj-$(CONFIG_MACH_ASPENITE) += aspenite.o
diff --git a/arch/arm/mach-mmp/include/mach/sram.h b/arch/arm/mach-mmp/include/mach/sram.h
new file mode 100644
index 000000000000..239e0fc1bb1f
--- /dev/null
+++ b/arch/arm/mach-mmp/include/mach/sram.h
@@ -0,0 +1,35 @@
+/*
+ * linux/arch/arm/mach-mmp/include/mach/sram.h
+ *
+ * SRAM Memory Management
+ *
+ * Copyright (c) 2011 Marvell Semiconductors Inc.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ */
+
+#ifndef __ASM_ARCH_SRAM_H
+#define __ASM_ARCH_SRAM_H
+
+#include <linux/genalloc.h>
+
+/* ARBITRARY: SRAM allocations are multiples of this 2^N size */
+#define SRAM_GRANULARITY 512
+
+enum sram_type {
+ MMP_SRAM_UNDEFINED = 0,
+ MMP_ASRAM,
+ MMP_ISRAM,
+};
+
+struct sram_platdata {
+ char *pool_name;
+ int granularity;
+};
+
+extern struct gen_pool *sram_get_gpool(char *pool_name);
+
+#endif /* __ASM_ARCH_SRAM_H */
diff --git a/arch/arm/mach-mmp/sram.c b/arch/arm/mach-mmp/sram.c
new file mode 100644
index 000000000000..4304f9519372
--- /dev/null
+++ b/arch/arm/mach-mmp/sram.c
@@ -0,0 +1,168 @@
+/*
+ * linux/arch/arm/mach-mmp/sram.c
+ *
+ * based on mach-davinci/sram.c - DaVinci simple SRAM allocator
+ *
+ * Copyright (c) 2011 Marvell Semiconductors Inc.
+ * All Rights Reserved
+ *
+ * Add for mmp sram support - Leo Yan <leoy@marvell.com>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ */
+
+#include <linux/module.h>
+#include <linux/init.h>
+#include <linux/platform_device.h>
+#include <linux/io.h>
+#include <linux/err.h>
+#include <linux/slab.h>
+#include <linux/genalloc.h>
+
+#include <mach/sram.h>
+
+struct sram_bank_info {
+ char *pool_name;
+ struct gen_pool *gpool;
+ int granularity;
+
+ phys_addr_t sram_phys;
+ void __iomem *sram_virt;
+ u32 sram_size;
+
+ struct list_head node;
+};
+
+static DEFINE_MUTEX(sram_lock);
+static LIST_HEAD(sram_bank_list);
+
+struct gen_pool *sram_get_gpool(char *pool_name)
+{
+ struct sram_bank_info *info = NULL;
+
+ if (!pool_name)
+ return NULL;
+
+ mutex_lock(&sram_lock);
+
+ list_for_each_entry(info, &sram_bank_list, node)
+ if (!strcmp(pool_name, info->pool_name))
+ break;
+
+ mutex_unlock(&sram_lock);
+
+ if (&info->node == &sram_bank_list)
+ return NULL;
+
+ return info->gpool;
+}
+EXPORT_SYMBOL(sram_get_gpool);
+
+static int __devinit sram_probe(struct platform_device *pdev)
+{
+ struct sram_platdata *pdata = pdev->dev.platform_data;
+ struct sram_bank_info *info;
+ struct resource *res;
+ int ret = 0;
+
+ if (!pdata && !pdata->pool_name)
+ return -ENODEV;
+
+ info = kzalloc(sizeof(*info), GFP_KERNEL);
+ if (!info)
+ return -ENOMEM;
+
+ res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+ if (res == NULL) {
+ dev_err(&pdev->dev, "no memory resource defined\n");
+ ret = -ENODEV;
+ goto out;
+ }
+
+ if (!resource_size(res))
+ return 0;
+
+ info->sram_phys = (phys_addr_t)res->start;
+ info->sram_size = resource_size(res);
+ info->sram_virt = ioremap(info->sram_phys, info->sram_size);
+ info->pool_name = kstrdup(pdata->pool_name, GFP_KERNEL);
+ info->granularity = pdata->granularity;
+
+ info->gpool = gen_pool_create(ilog2(info->granularity), -1);
+ if (!info->gpool) {
+ dev_err(&pdev->dev, "create pool failed\n");
+ ret = -ENOMEM;
+ goto create_pool_err;
+ }
+
+ ret = gen_pool_add_virt(info->gpool, (unsigned long)info->sram_virt,
+ info->sram_phys, info->sram_size, -1);
+ if (ret < 0) {
+ dev_err(&pdev->dev, "add new chunk failed\n");
+ ret = -ENOMEM;
+ goto add_chunk_err;
+ }
+
+ mutex_lock(&sram_lock);
+ list_add(&info->node, &sram_bank_list);
+ mutex_unlock(&sram_lock);
+
+ platform_set_drvdata(pdev, info);
+
+ dev_info(&pdev->dev, "initialized\n");
+ return 0;
+
+add_chunk_err:
+ gen_pool_destroy(info->gpool);
+create_pool_err:
+ iounmap(info->sram_virt);
+ kfree(info->pool_name);
+out:
+ kfree(info);
+ return ret;
+}
+
+static int __devexit sram_remove(struct platform_device *pdev)
+{
+ struct sram_bank_info *info;
+
+ info = platform_get_drvdata(pdev);
+ if (info == NULL)
+ return -ENODEV;
+
+ mutex_lock(&sram_lock);
+ list_del(&info->node);
+ mutex_unlock(&sram_lock);
+
+ gen_pool_destroy(info->gpool);
+ iounmap(info->sram_virt);
+ kfree(info->pool_name);
+ kfree(info);
+ return 0;
+}
+
+static const struct platform_device_id sram_id_table[] = {
+ { "asram", MMP_ASRAM },
+ { "isram", MMP_ISRAM },
+ { }
+};
+
+static struct platform_driver sram_driver = {
+ .probe = sram_probe,
+ .remove = sram_remove,
+ .driver = {
+ .name = "mmp-sram",
+ },
+ .id_table = sram_id_table,
+};
+
+static int __init sram_init(void)
+{
+ return platform_driver_register(&sram_driver);
+}
+core_initcall(sram_init);
+
+MODULE_LICENSE("GPL");