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Message-Id: <1312167547-26740-3-git-send-email-leoy@marvell.com>
Date: Mon, 1 Aug 2011 10:59:07 +0800
From: Leo Yan <leoy@...vell.com>
To: linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
haojian.zhuang@...vell.com, nicolas.pitre@...aro.org,
linux@....linux.org.uk, plagnioj@...osoft.com
Cc: Leo Yan <leoy@...vell.com>
Subject: [PATCH 2/2] ARM: mmp: add audio sram allocator
Implement the audio sram allocator with genalloc,
so that can dynamically allocate the buffer
to pcm devices as need.
Signed-off-by: Leo Yan <leoy@...vell.com>
---
arch/arm/Kconfig | 1 +
arch/arm/mach-mmp/Makefile | 2 +-
arch/arm/mach-mmp/audio_sram.c | 99 +++++++++++++++++++++++++++
arch/arm/mach-mmp/include/mach/audio_sram.h | 24 +++++++
4 files changed, 125 insertions(+), 1 deletions(-)
create mode 100644 arch/arm/mach-mmp/audio_sram.c
create mode 100644 arch/arm/mach-mmp/include/mach/audio_sram.h
diff --git a/arch/arm/Kconfig b/arch/arm/Kconfig
index 3eacf57..480e1524 100644
--- a/arch/arm/Kconfig
+++ b/arch/arm/Kconfig
@@ -546,6 +546,7 @@ 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 b0ac942..290182b 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 audio_sram.o
# board support
obj-$(CONFIG_MACH_ASPENITE) += aspenite.o
diff --git a/arch/arm/mach-mmp/audio_sram.c b/arch/arm/mach-mmp/audio_sram.c
new file mode 100644
index 0000000..73c7dc5
--- /dev/null
+++ b/arch/arm/mach-mmp/audio_sram.c
@@ -0,0 +1,99 @@
+/*
+ * linux/arch/arm/mach-mmp/audio_sram.c
+ *
+ * based on mach-davinci/sram.c - DaVinci simple SRAM allocator
+ *
+ * Copyright (c) 2011 Marvell Semiconductors Inc.
+ * All Rights Reserved
+ *
+ * Add for mmp audio sram support - Leo Yan <leoy@...vell.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/genalloc.h>
+
+#include <mach/audio_sram.h>
+
+static phys_addr_t audio_sram_phys;
+static void __iomem *audio_sram_virt;
+static u32 audio_sram_size;
+
+struct gen_pool *mmp_audio_sram_gpool;
+EXPORT_SYMBOL_GPL(mmp_audio_sram_gpool);
+
+static int __devinit audio_sram_probe(struct platform_device *pdev)
+{
+ struct resource *res;
+ int ret = 0;
+
+ res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+ if (res == NULL) {
+ dev_err(&pdev->dev, "no memory resource defined\n");
+ ret = -ENODEV;
+ goto out;
+ }
+ audio_sram_phys = (phys_addr_t)res->start;
+ audio_sram_size = res->end - res->start + 1;
+ audio_sram_virt = ioremap(audio_sram_phys, audio_sram_size);
+
+ if (!audio_sram_size)
+ return 0;
+
+ mmp_audio_sram_gpool =
+ gen_pool_create(ilog2(AUDIO_SRAM_GRANULARITY), -1);
+ if (!mmp_audio_sram_gpool) {
+ dev_err(&pdev->dev, "create pool failed\n");
+ ret = -ENOMEM;
+ goto create_pool_err;
+ }
+
+ ret = gen_pool_add_virt(mmp_audio_sram_gpool,
+ (unsigned long)audio_sram_virt,
+ audio_sram_phys, audio_sram_size, -1);
+ if (ret < 0) {
+ dev_err(&pdev->dev, "add new chunk failed\n");
+ ret = -ENOMEM;
+ goto add_chunk_err;
+ }
+
+ return 0;
+
+add_chunk_err:
+ gen_pool_destroy(mmp_audio_sram_gpool);
+create_pool_err:
+ iounmap(audio_sram_virt);
+out:
+ return ret;
+}
+
+static int __devexit audio_sram_remove(struct platform_device *pdev)
+{
+ gen_pool_destroy(mmp_audio_sram_gpool);
+ iounmap(audio_sram_virt);
+ return 0;
+}
+
+static struct platform_driver audio_sram_driver = {
+ .probe = audio_sram_probe,
+ .remove = audio_sram_remove,
+ .driver = {
+ .name = "mmp-audio-sram",
+ },
+};
+
+static int __init audio_sram_init(void)
+{
+ return platform_driver_register(&audio_sram_driver);
+}
+core_initcall(audio_sram_init);
+
+MODULE_LICENSE("GPL");
diff --git a/arch/arm/mach-mmp/include/mach/audio_sram.h b/arch/arm/mach-mmp/include/mach/audio_sram.h
new file mode 100644
index 0000000..27124d5
--- /dev/null
+++ b/arch/arm/mach-mmp/include/mach/audio_sram.h
@@ -0,0 +1,24 @@
+/*
+ * linux/arch/arm/mach-mmp/include/mach/audio_sram.h
+ *
+ * Audio 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_AUDIO_SRAM_H
+#define __ASM_ARCH_AUDIO_SRAM_H
+
+#include <linux/genalloc.h>
+
+/* ARBITRARY: SRAM allocations are multiples of this 2^N size */
+#define AUDIO_SRAM_GRANULARITY 512
+
+extern struct gen_pool *mmp_audio_sram_gpool;
+
+#endif /* __ASM_ARCH_AUDIO_SRAM_H */
--
1.7.4.1
--
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