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authorSascha Hauer <s.hauer@pengutronix.de>2011-12-01 22:09:49 +0100
committerSascha Hauer <s.hauer@pengutronix.de>2011-12-04 22:26:07 +0100
commitec8dd2542847c4e161d8fc521dfc6af0ed25c896 (patch)
treec10bfda6666f0231585f02a92fa3e790ad2c2170 /common/memory.c
parent32f163f67c10ff7415baee2d022459cc859d84b1 (diff)
downloadbarebox-ec8dd2542847c4e161d8fc521dfc6af0ed25c896.tar.gz
register sdram as resources
Also, request the sdram regions used by the barebox binary, bss, malloc space and stack. Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
Diffstat (limited to 'common/memory.c')
-rw-r--r--common/memory.c58
1 files changed, 58 insertions, 0 deletions
diff --git a/common/memory.c b/common/memory.c
index 0ba9a18..7d0f4ca 100644
--- a/common/memory.c
+++ b/common/memory.c
@@ -25,6 +25,9 @@
#include <of.h>
#include <init.h>
#include <libfdt.h>
+#include <linux/ioport.h>
+#include <asm-generic/memory_layout.h>
+#include <asm/sections.h>
/*
* Begin and End of memory area for malloc(), and current "brk"
@@ -50,6 +53,33 @@ void mem_malloc_init(void *start, void *end)
malloc_brk = malloc_start;
}
+static int mem_malloc_resource(void)
+{
+ /*
+ * Normally it's a bug when one of these fails,
+ * but we have some setups where some of these
+ * regions are outside of sdram in which case
+ * the following fails.
+ */
+ request_sdram_region("malloc space",
+ malloc_start,
+ malloc_end - malloc_start + 1);
+ request_sdram_region("barebox",
+ (unsigned long)&_stext,
+ (unsigned long)&_etext -
+ (unsigned long)&_stext + 1);
+ request_sdram_region("bss",
+ (unsigned long)&__bss_start,
+ (unsigned long)&__bss_stop -
+ (unsigned long)&__bss_start + 1);
+#ifdef STACK_BASE
+ request_sdram_region("stack", STACK_BASE, STACK_SIZE);
+#endif
+
+ return 0;
+}
+coredevice_initcall(mem_malloc_resource);
+
static void *sbrk_no_zero(ptrdiff_t increment)
{
unsigned long old = malloc_brk;
@@ -82,6 +112,10 @@ void barebox_add_memory_bank(const char *name, resource_size_t start,
struct memory_bank *bank = xzalloc(sizeof(*bank));
struct device_d *dev;
+ bank->res = request_iomem_region(name, start, size);
+
+ BUG_ON(!bank->res);
+
dev = add_mem_device(name, start, size, IORESOURCE_MEM_WRITEABLE);
bank->dev = dev;
@@ -91,6 +125,30 @@ void barebox_add_memory_bank(const char *name, resource_size_t start,
list_add_tail(&bank->list, &memory_banks);
}
+/*
+ * Request a region from the registered sdram
+ */
+struct resource *request_sdram_region(const char *name, resource_size_t start,
+ resource_size_t size)
+{
+ struct memory_bank *bank;
+
+ for_each_memory_bank(bank) {
+ struct resource *res;
+
+ res = request_region(bank->res, name, start, size);
+ if (res)
+ return res;
+ }
+
+ return NULL;
+}
+
+int release_sdram_region(struct resource *res)
+{
+ return release_region(res);
+}
+
#ifdef CONFIG_OFTREE
/*