davinci: soc-specific SRAM setup

Package on-chip SRAM.  It's always accessible from the ARM, so
set up a standardized virtual address mapping into a 128 KiB
area that's reserved for platform use.

In some cases (dm6467) the physical addresses used for EDMA are
not the same as the ones used by the ARM ... so record that info
separately in the SOC data, for chips (unlike the OMAP-L137)
where SRAM may be used with EDMA.

Other blocks of SRAM, such as the ETB buffer or DSP L1/L2 RAM,
may be unused/available on some system.  They are ignored here.

Signed-off-by: David Brownell <dbrownell@users.sourceforge.net>
Signed-off-by: Kevin Hilman <khilman@deeprootsystems.com>

1 files changed, 9 insertions, 0 deletions

diff --git a/arch/arm/mach-davinci/dm644x.c b/arch/arm/mach-davinci/dm644x.c
index 4ab5f07ead05..fb5449b3c97b 100644
--- a/arch/arm/mach-davinci/dm644x.c
+++ b/arch/arm/mach-davinci/dm644x.c
@@ -539,6 +539,13 @@ static struct map_desc dm644x_io_desc[] = {
                 .length         = IO_SIZE,
                 .type           = MT_DEVICE
         },
+        {
+                .virtual        = SRAM_VIRT,
+                .pfn            = __phys_to_pfn(0x00008000),
+                .length         = SZ_16K,
+                /* MT_MEMORY_NONCACHED requires supersection alignment */
+                .type           = MT_DEVICE,
+        },
 };
 
 /* Contents of JTAG ID register used to identify exact cpu type */
@@ -629,6 +636,8 @@ static struct davinci_soc_info davinci_soc_info_dm644x = {
         .gpio_irq               = IRQ_GPIOBNK0,
         .serial_dev             = &dm644x_serial_device,
         .emac_pdata             = &dm644x_emac_pdata,
+        .sram_dma               = 0x00008000,
+        .sram_len               = SZ_16K,
 };
 
 void __init dm644x_init(void)