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Message-ID: <1285966279-27719-1-git-send-email-Dinh.Nguyen@freescale.com>
Date: Fri, 1 Oct 2010 15:51:19 -0500
From: <Dinh.Nguyen@...escale.com>
To: linux-kernel@...r.kernel.org
CC: linux-arm-kernel@...ts.infradead.org, s.hauer@...gutronix.de,
r.schwebel@...gutronix.de, valentin.longchamp@...l.ch,
daniel@...aq.de, grant.likely@...retlab.ca,
amit.kucheria@...onical.com, xiao-lizhang@...escale.com,
Dinh Nguyen <Dinh.Nguyen@...escale.com>
Subject: [PATCH] ARM: imx: Add iram allocator functions
From: Dinh Nguyen <Dinh.Nguyen@...escale.com>
Add iram allocation functions using GENERIC_ALLOCATOR. The
allocation size is 4KB multiples to guarantee alignment. The
idea for these functions is for i.MX platforms to use them
to dynamically allocate IRAM usage.
Applies on 2.6.36-rc6
Signed-off-by: Dinh Nguyen <Dinh.Nguyen@...escale.com>
---
arch/arm/plat-mxc/Kconfig | 5 ++
arch/arm/plat-mxc/Makefile | 1 +
arch/arm/plat-mxc/include/mach/iram_alloc.h | 35 +++++++++++++++
arch/arm/plat-mxc/iram.c | 62 +++++++++++++++++++++++++++
4 files changed, 103 insertions(+), 0 deletions(-)
create mode 100644 arch/arm/plat-mxc/include/mach/iram_alloc.h
create mode 100644 arch/arm/plat-mxc/iram.c
diff --git a/arch/arm/plat-mxc/Kconfig b/arch/arm/plat-mxc/Kconfig
index 6785db4..283d5bc 100644
--- a/arch/arm/plat-mxc/Kconfig
+++ b/arch/arm/plat-mxc/Kconfig
@@ -57,6 +57,11 @@ source "arch/arm/mach-mx5/Kconfig"
endmenu
+config IRAM_ALLOC
+ bool
+ default y
+ select GENERIC_ALLOCATOR
+
config MXC_IRQ_PRIOR
bool "Use IRQ priority"
help
diff --git a/arch/arm/plat-mxc/Makefile b/arch/arm/plat-mxc/Makefile
index 78d405e..35cf07b 100644
--- a/arch/arm/plat-mxc/Makefile
+++ b/arch/arm/plat-mxc/Makefile
@@ -10,6 +10,7 @@ obj-$(CONFIG_MXC_TZIC) += tzic.o
obj-$(CONFIG_IMX_HAVE_IOMUX_V1) += iomux-v1.o
obj-$(CONFIG_ARCH_MXC_IOMUX_V3) += iomux-v3.o
+obj-$(CONFIG_IRAM_ALLOC) += iram.o
obj-$(CONFIG_MXC_PWM) += pwm.o
obj-$(CONFIG_USB_EHCI_MXC) += ehci.o
obj-$(CONFIG_MXC_ULPI) += ulpi.o
diff --git a/arch/arm/plat-mxc/include/mach/iram_alloc.h b/arch/arm/plat-mxc/include/mach/iram_alloc.h
new file mode 100644
index 0000000..12881aa
--- /dev/null
+++ b/arch/arm/plat-mxc/include/mach/iram_alloc.h
@@ -0,0 +1,35 @@
+/*
+ * Copyright (C) 2010 Freescale Semiconductor, Inc. All Rights Reserved.
+ *
+ * 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., 51 Franklin Street, Fifth Floor, Boston,
+ * MA 02110-1301, USA.
+ */
+
+#ifdef CONFIG_IRAM_ALLOC
+int __init iram_init(unsigned long base, unsigned long size);
+void *iram_alloc(unsigned int size, unsigned long *dma_addr);
+void iram_free(unsigned long dma_addr, unsigned int size);
+#else
+static inline int __init iram_init(unsigned long base, unsigned long size)
+{
+ return -ENOMEM;
+}
+static inline void *iram_alloc(unsigned int size, unsigned long *dma_addr)
+{
+ return NULL;
+}
+static inline void iram_free(unsigned long base, unsigned long size) {}
+#endif
+
diff --git a/arch/arm/plat-mxc/iram.c b/arch/arm/plat-mxc/iram.c
new file mode 100644
index 0000000..3d2a391
--- /dev/null
+++ b/arch/arm/plat-mxc/iram.c
@@ -0,0 +1,62 @@
+/*
+ * Copyright (C) 2010 Freescale Semiconductor, Inc. All Rights Reserved.
+ *
+ * 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., 51 Franklin Street, Fifth Floor, Boston,
+ * MA 02110-1301, USA.
+ */
+
+#include <linux/kernel.h>
+#include <linux/io.h>
+#include <linux/module.h>
+#include <linux/spinlock.h>
+#include <linux/genalloc.h>
+
+static unsigned long iram_phys_base;
+static __iomem void *iram_virt_base;
+static struct gen_pool *iram_pool;
+
+#define iram_phys_to_virt(p) (iram_virt_base + ((p) - iram_phys_base))
+
+void *iram_alloc(unsigned int size, unsigned long *dma_addr)
+{
+ if (!iram_pool)
+ return NULL;
+
+ *dma_addr = gen_pool_alloc(iram_pool, size);
+ pr_debug("iram alloc - %dB@...p\n", size, (void *)*dma_addr);
+ return iram_phys_to_virt(*dma_addr);
+}
+EXPORT_SYMBOL(iram_alloc);
+
+void iram_free(unsigned long addr, unsigned int size)
+{
+ if (!iram_pool)
+ return;
+
+ gen_pool_free(iram_pool, addr, size);
+}
+EXPORT_SYMBOL(iram_free);
+
+int __init iram_init(unsigned long base, unsigned long size)
+{
+ iram_phys_base = base;
+
+ iram_pool = gen_pool_create(12, -1);
+ gen_pool_add(iram_pool, base, size, -1);
+ iram_virt_base = ioremap(iram_phys_base, size);
+
+ pr_info("i.MX IRAM pool: %ld KB@...p\n", size / 1024, iram_virt_base);
+ return 0;
+}
--
1.6.0.4
--
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