From mboxrd@z Thu Jan 1 00:00:00 1970 Return-path: Received: from 17.mo5.mail-out.ovh.net ([46.105.56.132] helo=mo5.mail-out.ovh.net) by merlin.infradead.org with esmtp (Exim 4.76 #1 (Red Hat Linux)) id 1TzWjH-0003dc-5a for barebox@lists.infradead.org; Sun, 27 Jan 2013 18:13:19 +0000 Received: from mail178.ha.ovh.net (b9.ovh.net [213.186.33.59]) by mo5.mail-out.ovh.net (Postfix) with SMTP id E6D8AFFA4B7 for ; Sun, 27 Jan 2013 19:23:14 +0100 (CET) From: Jean-Christophe PLAGNIOL-VILLARD Date: Sun, 27 Jan 2013 19:11:55 +0100 Message-Id: <1359310316-20121-1-git-send-email-plagnioj@jcrosoft.com> In-Reply-To: <20130127180957.GO26329@game.jcrosoft.o> References: <20130127180957.GO26329@game.jcrosoft.o> List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: barebox-bounces@lists.infradead.org Errors-To: barebox-bounces+u.kleine-koenig=pengutronix.de@lists.infradead.org Subject: [PATCH 1/2] at91rm9200: add autodetect sdram size To: barebox@lists.infradead.org Signed-off-by: Jean-Christophe PLAGNIOL-VILLARD --- arch/arm/mach-at91/at91rm9200_devices.c | 3 +++ arch/arm/mach-at91/include/mach/at91rm9200_mc.h | 30 +++++++++++++++++++++++ 2 files changed, 33 insertions(+) diff --git a/arch/arm/mach-at91/at91rm9200_devices.c b/arch/arm/mach-at91/at91rm9200_devices.c index 84d4c15..0f2ec1f 100644 --- a/arch/arm/mach-at91/at91rm9200_devices.c +++ b/arch/arm/mach-at91/at91rm9200_devices.c @@ -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); diff --git a/arch/arm/mach-at91/include/mach/at91rm9200_mc.h b/arch/arm/mach-at91/include/mach/at91rm9200_mc.h index d34e4ed..fc44a61 100644 --- a/arch/arm/mach-at91/include/mach/at91rm9200_mc.h +++ b/arch/arm/mach-at91/include/mach/at91rm9200_mc.h @@ -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 +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 -- 1.7.10.4 _______________________________________________ barebox mailing list barebox@lists.infradead.org http://lists.infradead.org/mailman/listinfo/barebox