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at91rm9200: add autodetect sdram size 

Signed-off-by: Jean-Christophe PLAGNIOL-VILLARD <plagnioj@jcrosoft.com>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
This commit is contained in:
Jean-Christophe PLAGNIOL-VILLARD 2013-01-27 19:11:55 +01:00 committed by Sascha Hauer
parent 96834273b0
commit ef361d4e92
2 changed files with 33 additions and 0 deletions
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3
arch/arm/mach-at91/at91rm9200_devices.c
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@ -25,6 +25,9 @@
void at91_add_device_sdram(u32 size)
{
if (!size)
size = at91rm9200_get_sdram_size();
arm_add_mem_device("ram0", AT91_CHIPSELECT_1, size);
add_mem_device("sram0", AT91RM9200_SRAM_BASE, AT91RM9200_SRAM_SIZE,
IORESOURCE_MEM_WRITEABLE);

30
arch/arm/mach-at91/include/mach/at91rm9200_mc.h
View File

@ -157,4 +157,34 @@
#define AT91_BFC_MUXEN (1 << 18) /* Multiplexed Bus Enable */
#define AT91_BFC_RDYEN (1 << 19) /* Ready Enable Mode */
#ifndef __ASSEMBLY__
#include <mach/io.h>
static inline u32 at91rm9200_get_sdram_size(void)
{
u32 cr, mr;
u32 size;
cr = at91_sys_read(AT91_SDRAMC_CR);
mr = at91_sys_read(AT91_SDRAMC_MR);
/* Formula:
* size = bank << (col + row + 1);
* if (bandwidth == 32 bits)
* size <<= 1;
*/
size = 1;
/* COL */
size += (cr & AT91_SDRAMC_NC) + 8;
/* ROW */
size += ((cr & AT91_SDRAMC_NR) >> 2) + 11;
/* BANK */
size = ((cr & AT91_SDRAMC_NB) ? 4 : 2) << size;
/* bandwidth */
if (!(mr & AT91_SDRAMC_DBW))
size <<= 1;
return size;
}
#endif
#endif