From patchwork Tue Mar 8 13:07:30 2011 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Aneesh V X-Patchwork-Id: 85975 Return-Path: X-Original-To: incoming@patchwork.ozlabs.org Delivered-To: patchwork-incoming@bilbo.ozlabs.org Received: from theia.denx.de (theia.denx.de [85.214.87.163]) by ozlabs.org (Postfix) with ESMTP id C80BAB6EEA for ; Wed, 9 Mar 2011 00:09:01 +1100 (EST) Received: from localhost (localhost [127.0.0.1]) by theia.denx.de (Postfix) with ESMTP id 09F4F280D6; Tue, 8 Mar 2011 14:08:49 +0100 (CET) X-Virus-Scanned: Debian amavisd-new at theia.denx.de Received: from theia.denx.de ([127.0.0.1]) by localhost (theia.denx.de [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id hM6kJaR5x5Zf; Tue, 8 Mar 2011 14:08:48 +0100 (CET) Received: from theia.denx.de (localhost [127.0.0.1]) by theia.denx.de (Postfix) with ESMTP id 5A7232808C; Tue, 8 Mar 2011 14:08:25 +0100 (CET) Received: from localhost (localhost [127.0.0.1]) by theia.denx.de (Postfix) with ESMTP id EF0E428089 for ; Tue, 8 Mar 2011 14:08:17 +0100 (CET) X-Virus-Scanned: Debian amavisd-new at theia.denx.de Received: from theia.denx.de ([127.0.0.1]) by localhost (theia.denx.de [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id 8IAFNS2yKZ4d for ; Tue, 8 Mar 2011 14:08:16 +0100 (CET) X-policyd-weight: NOT_IN_SBL_XBL_SPAMHAUS=-1.5 NOT_IN_SPAMCOP=-1.5 NOT_IN_BL_NJABL=-1.5 (only DNSBL check requested) Received: from devils.ext.ti.com (devils.ext.ti.com [198.47.26.153]) by theia.denx.de (Postfix) with ESMTPS id 132C52807D for ; Tue, 8 Mar 2011 14:08:11 +0100 (CET) Received: from dbdp31.itg.ti.com ([172.24.170.98]) by devils.ext.ti.com (8.13.7/8.13.7) with ESMTP id p28D85I0006801 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-SHA bits=256 verify=NO); Tue, 8 Mar 2011 07:08:07 -0600 Received: from localhost (localhost [127.0.0.1]) by dbdp31.itg.ti.com (8.13.8/8.13.8) with ESMTP id p28D84iv006432; Tue, 8 Mar 2011 18:38:04 +0530 (IST) From: Aneesh V To: u-boot@lists.denx.de Date: Tue, 8 Mar 2011 18:37:30 +0530 Message-Id: <1299589658-30896-3-git-send-email-aneesh@ti.com> X-Mailer: git-send-email 1.7.0.4 In-Reply-To: <1299589658-30896-1-git-send-email-aneesh@ti.com> References: <1299589658-30896-1-git-send-email-aneesh@ti.com> Cc: steve@sakoman.com Subject: [U-Boot] [PATCH v2 02/10] armv7: add miscellaneous utility macros X-BeenThere: u-boot@lists.denx.de X-Mailman-Version: 2.1.9 Precedence: list List-Id: U-Boot discussion List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , MIME-Version: 1.0 Sender: u-boot-bounces@lists.denx.de Errors-To: u-boot-bounces@lists.denx.de add utility macros for: * bit field operations * log2n functions Signed-off-by: Aneesh V --- arch/arm/include/asm/utils.h | 80 ++++++++++++++++++++++++++++++++++++++++++ 1 files changed, 80 insertions(+), 0 deletions(-) create mode 100644 arch/arm/include/asm/utils.h diff --git a/arch/arm/include/asm/utils.h b/arch/arm/include/asm/utils.h new file mode 100644 index 0000000..d581539 --- /dev/null +++ b/arch/arm/include/asm/utils.h @@ -0,0 +1,80 @@ +/* + * (C) Copyright 2010 + * Texas Instruments, + * + * Aneesh V + * + * See file CREDITS for list of people who contributed to this + * project. + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of the GNU General Public License as + * published by the Free Software Foundation; either version 2 of + * the License, or (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write to the Free Software + * Foundation, Inc., 59 Temple Place, Suite 330, Boston, + * MA 02111-1307 USA + */ +#ifndef _UTILS_H_ +#define _UTILS_H_ + +/* extract a bit field from a bit vector */ +#define get_bit_field(nr, start, mask)\ + (((nr) & (mask)) >> (start)) + +/* Set a field in a bit vector */ +#define set_bit_field(nr, start, mask, val)\ + do { \ + (nr) = ((nr) & ~(mask)) | (((val) << (start)) & (mask));\ + } while (0); + +/* + * Utility macro for read-modify-write of a hardware register + * addr - address of the register + * shift - starting bit position of the field to be modified + * msk - mask for the field + * val - value to be shifted masked and written to the field + */ +#define modify_reg_32(addr, shift, msk, val) \ + do {\ + writel(((readl(addr) & ~(msk))|(((val) << (shift)) & (msk))),\ + (addr));\ + } while (0); + +static inline s32 log_2_n_round_up(u32 n) +{ + s32 log2n = -1; + u32 temp = n; + + while (temp) { + log2n++; + temp >>= 1; + } + + if (n & (n - 1)) + return log2n + 1; /* not power of 2 - round up */ + else + return log2n; /* power of 2 */ +} + +static inline s32 log_2_n_round_down(u32 n) +{ + s32 log2n = -1; + u32 temp = n; + + while (temp) { + log2n++; + temp >>= 1; + } + + return log2n; +} + +#endif /* _OMAP_COMMON_H_ */