linux-kernel - [PATCH 06/10] avr32: Add simple SRAM allocator

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Message-Id: <1205419185-26395-7-git-send-email-hskinnemoen@atmel.com>
Date:	Thu, 13 Mar 2008 15:39:41 +0100
From:	Haavard Skinnemoen <hskinnemoen@...el.com>
To:	kernel@...32linux.org
Cc:	linux-kernel@...r.kernel.org,
	Haavard Skinnemoen <hskinnemoen@...el.com>,
	David Brownell <david-b@...bell.net>
Subject: [PATCH 06/10] avr32: Add simple SRAM allocator

Add SRAM allocator for avr32, which is just a thin wrapper around
genalloc.

Signed-off-by: Haavard Skinnemoen <hskinnemoen@...el.com>
---
 arch/avr32/Kconfig                   |    1 +
 arch/avr32/mach-at32ap/at32ap700x.c  |   26 ++++++++++++++++++++++++++
 include/asm-avr32/arch-at32ap/sram.h |   30 ++++++++++++++++++++++++++++++
 3 files changed, 57 insertions(+), 0 deletions(-)
 create mode 100644 include/asm-avr32/arch-at32ap/sram.h

diff --git a/arch/avr32/Kconfig b/arch/avr32/Kconfig
index 521dc18..078ab31 100644
--- a/arch/avr32/Kconfig
+++ b/arch/avr32/Kconfig
@@ -89,6 +89,7 @@ config PLATFORM_AT32AP
 	select MMU
 	select PERFORMANCE_COUNTERS
 	select HAVE_GPIO_LIB
+	select GENERIC_ALLOCATOR
 
 #
 # CPU types
diff --git a/arch/avr32/mach-at32ap/at32ap700x.c b/arch/avr32/mach-at32ap/at32ap700x.c
index ca5ee7a..cd94a1f 100644
--- a/arch/avr32/mach-at32ap/at32ap700x.c
+++ b/arch/avr32/mach-at32ap/at32ap700x.c
@@ -20,6 +20,7 @@
 #include <asm/arch/at32ap700x.h>
 #include <asm/arch/board.h>
 #include <asm/arch/portmux.h>
+#include <asm/arch/sram.h>
 
 #include <video/atmel_lcdc.h>
 
@@ -2007,3 +2008,28 @@ void __init setup_platform(void)
 	at32_init_pio(&pio3_device);
 	at32_init_pio(&pio4_device);
 }
+
+struct gen_pool *sram_pool;
+
+static int __init sram_init(void)
+{
+	struct gen_pool *pool;
+
+	/* 1KiB granularity */
+	pool = gen_pool_create(10, -1);
+	if (!pool)
+		goto fail;
+
+	if (gen_pool_add(pool, 0x24000000, 0x8000, -1))
+		goto err_pool_add;
+
+	sram_pool = pool;
+	return 0;
+
+err_pool_add:
+	gen_pool_destroy(pool);
+fail:
+	pr_err("Failed to create SRAM pool\n");
+	return -ENOMEM;
+}
+core_initcall(sram_init);
diff --git a/include/asm-avr32/arch-at32ap/sram.h b/include/asm-avr32/arch-at32ap/sram.h
new file mode 100644
index 0000000..4838dae
--- /dev/null
+++ b/include/asm-avr32/arch-at32ap/sram.h
@@ -0,0 +1,30 @@
+/*
+ * Simple SRAM allocator
+ *
+ * Copyright (C) 2008 Atmel Corporation
+ *
+ * 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_AVR32_ARCH_SRAM_H
+#define __ASM_AVR32_ARCH_SRAM_H
+
+#include <linux/genalloc.h>
+
+extern struct gen_pool *sram_pool;
+
+static inline unsigned long sram_alloc(size_t len)
+{
+	if (!sram_pool)
+		return 0UL;
+
+	return gen_pool_alloc(sram_pool, len);
+}
+
+static inline void sram_free(unsigned long addr, size_t len)
+{
+	return gen_pool_free(sram_pool, addr, len);
+}
+
+#endif /* __ASM_AVR32_ARCH_SRAM_H */
-- 
1.5.4.3

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