L3RAM (shared SRAM) is needed for use by several drivers.
This creates a genalloc pool and a hook for the platform code
to provide the struct gen_pool * in platform data.
Signed-off-by: Matt Porter <mporter@xxxxxx>
---
arch/arm/mach-davinci/include/mach/common.h | 2 ++
arch/arm/mach-davinci/include/mach/sram.h | 3 +++
arch/arm/mach-davinci/sram.c | 28 ++++++++++++++++++++++++++-
3 files changed, 32 insertions(+), 1 deletion(-)
diff --git a/arch/arm/mach-davinci/include/mach/common.h b/arch/arm/mach-davinci/include/mach/common.h
index bdc4aa8..5a2ea37 100644
--- a/arch/arm/mach-davinci/include/mach/common.h
+++ b/arch/arm/mach-davinci/include/mach/common.h
@@ -77,6 +77,8 @@ struct davinci_soc_info {
struct emac_platform_data *emac_pdata;
dma_addr_t sram_dma;
unsigned sram_len;
+ dma_addr_t l3ram_dma;
+ unsigned l3ram_len;
};
extern struct davinci_soc_info davinci_soc_info;
diff --git a/arch/arm/mach-davinci/include/mach/sram.h b/arch/arm/mach-davinci/include/mach/sram.h
index 111f7cc..1a81e5b 100644
--- a/arch/arm/mach-davinci/include/mach/sram.h
+++ b/arch/arm/mach-davinci/include/mach/sram.h
@@ -24,4 +24,7 @@
extern void *sram_alloc(size_t len, dma_addr_t *dma);
extern void sram_free(void *addr, size_t len);
+/* Get the l3ram struct gen_pool * for use in platform data */
+extern struct gen_pool *sram_get_l3ram_pool(void);
+
#endif /* __MACH_SRAM_H */
diff --git a/arch/arm/mach-davinci/sram.c b/arch/arm/mach-davinci/sram.c
index db0f778..e609fa3 100644
--- a/arch/arm/mach-davinci/sram.c
+++ b/arch/arm/mach-davinci/sram.c
@@ -15,7 +15,12 @@
#include <mach/common.h>
#include <mach/sram.h>
-static struct gen_pool *sram_pool;
+static struct gen_pool *sram_pool, *l3ram_pool;
+
+struct gen_pool *sram_get_l3ram_pool(void)
+{
+ return l3ram_pool;
+}
void *sram_alloc(size_t len, dma_addr_t *dma)
{
@@ -54,6 +59,9 @@ EXPORT_SYMBOL(sram_free);
static int __init sram_init(void)
{
unsigned len = davinci_soc_info.sram_len;
+ unsigned l3ram_dma = davinci_soc_info.l3ram_dma;
+ unsigned l3ram_len = davinci_soc_info.l3ram_len;
+ void *l3ram_virt;
int status = 0;
if (len) {
@@ -65,6 +73,24 @@ static int __init sram_init(void)
if (sram_pool)
status = gen_pool_add(sram_pool, SRAM_VIRT, len, -1);
WARN_ON(status < 0);
+
+ if (l3ram_dma) {
+ l3ram_pool =
+ gen_pool_create(ilog2(SRAM_GRANULARITY), -1);
+ if (!l3ram_pool)
+ status = -ENOMEM;
+ }
+
+ if (l3ram_pool) {
+ l3ram_virt = ioremap(l3ram_dma, l3ram_len);
+ if (l3ram_virt)
+ status = gen_pool_add_virt(l3ram_pool,
+ (unsigned long)l3ram_virt,
+ l3ram_dma, l3ram_len, -1);
+ else
+ status = -ENOMEM;
+ }
+
return status;
}
core_initcall(sram_init);
--
1.7.9.5
--
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