From mboxrd@z Thu Jan 1 00:00:00 1970 Delivery-date: Thu, 09 Jun 2022 08:00:59 +0200 Received: from metis.ext.pengutronix.de ([2001:67c:670:201:290:27ff:fe1d:cc33]) by lore.white.stw.pengutronix.de with esmtps (TLS1.3) tls TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384 (Exim 4.94.2) (envelope-from ) id 1nzBE3-008RzZ-Ut for lore@lore.pengutronix.de; Thu, 09 Jun 2022 08:00:59 +0200 Received: from bombadil.infradead.org ([2607:7c80:54:3::133]) by metis.ext.pengutronix.de with esmtps (TLS1.3:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.92) (envelope-from ) id 1nzBE1-0000Zw-Ll for lore@pengutronix.de; Thu, 09 Jun 2022 08:00:59 +0200 DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20210309; h=Sender: Content-Transfer-Encoding:Content-Type:List-Subscribe:List-Help:List-Post: List-Archive:List-Unsubscribe:List-Id:MIME-Version:References:In-Reply-To: Message-Id:Date:Subject:Cc:To:From:Reply-To:Content-ID:Content-Description: Resent-Date:Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID: List-Owner; bh=UqLvbdPiE9Xl79aZ6fKdetn1OhX4YuCRloHmdUCXwA0=; b=ez5+4qBFJTJPzI m8On/HrFCzpbDPVHTMm9jwB85U7cVcMTJWC5ljWsDrv93jyoAA4GAhL+3lNXvMiOX7zi86dZSWpHp GXTeH068vx/Lb/VQYIc3gxNCQmLtIWPuvTOZxffiK7tEKYxC0PmagejYrtC/DUebqTCWKiElez3CH gLOFGcBGwF/AXnC/qVKnv+3THQlwlS5dmZruC+0DXZZSHHcanEYQZBq4vs0nyB7EXDoSb6Efatak+ H5hZsrRprn7gR2YnWpsV6dJoaVGPtr6RwO3+5PrzJiBGNAeuF205ySc7u6oLQbPHVsFYD3gufjGoq uP0NxTE3hZF0HBbCRGtQ==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.94.2 #2 (Red Hat Linux)) id 1nzBCh-00Gv4n-6z; Thu, 09 Jun 2022 05:59:35 +0000 Received: from metis.ext.pengutronix.de ([2001:67c:670:201:290:27ff:fe1d:cc33]) by bombadil.infradead.org with esmtps (Exim 4.94.2 #2 (Red Hat Linux)) id 1nzBCZ-00GuyU-AV for barebox@lists.infradead.org; Thu, 09 Jun 2022 05:59:28 +0000 Received: from drehscheibe.grey.stw.pengutronix.de ([2a0a:edc0:0:c01:1d::a2]) by metis.ext.pengutronix.de with esmtps (TLS1.3:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.92) (envelope-from ) id 1nzBCX-0008GK-SQ; Thu, 09 Jun 2022 07:59:25 +0200 Received: from [2a0a:edc0:0:1101:1d::ac] (helo=dude04.red.stw.pengutronix.de) by drehscheibe.grey.stw.pengutronix.de with esmtp (Exim 4.94.2) (envelope-from ) id 1nzBCY-007K8y-9m; Thu, 09 Jun 2022 07:59:24 +0200 Received: from afa by dude04.red.stw.pengutronix.de with local (Exim 4.94.2) (envelope-from ) id 1nzBCV-002nZW-9I; Thu, 09 Jun 2022 07:59:23 +0200 From: Ahmad Fatoum To: barebox@lists.infradead.org Cc: Ahmad Fatoum Date: Thu, 9 Jun 2022 07:59:03 +0200 Message-Id: <20220609055922.667016-3-a.fatoum@pengutronix.de> X-Mailer: git-send-email 2.30.2 In-Reply-To: <20220609055922.667016-1-a.fatoum@pengutronix.de> References: <20220609055922.667016-1-a.fatoum@pengutronix.de> MIME-Version: 1.0 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20220608_225927_394017_922700AD X-CRM114-Status: UNSURE ( 9.82 ) X-CRM114-Notice: Please train this message. X-BeenThere: barebox@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "barebox" X-SA-Exim-Connect-IP: 2607:7c80:54:3::133 X-SA-Exim-Mail-From: barebox-bounces+lore=pengutronix.de@lists.infradead.org X-Spam-Checker-Version: SpamAssassin 3.4.2 (2018-09-13) on metis.ext.pengutronix.de X-Spam-Level: X-Spam-Status: No, score=-4.2 required=4.0 tests=AWL,BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS, MAILING_LIST_MULTI,RCVD_IN_DNSWL_NONE,SPF_HELO_NONE,SPF_NONE, T_SCC_BODY_TEXT_LINE autolearn=unavailable autolearn_force=no version=3.4.2 Subject: [PATCH v2 02/21] dma: add dma_sync nop stubs for PBL X-SA-Exim-Version: 4.2.1 (built Wed, 08 May 2019 21:11:16 +0000) X-SA-Exim-Scanned: Yes (on metis.ext.pengutronix.de) We can implement dma_sync functions as compiler barriers when we are certain that the buffers are in coherent/uncached memory, e.g. because MMU is only enabled in barebox_arm_entry which hasn't run yet. This will come in handy when doing mailbox communication in PBL on the Raspberry Pi. Signed-off-by: Ahmad Fatoum --- include/dma.h | 19 +++++++++++++++++++ 1 file changed, 19 insertions(+) diff --git a/include/dma.h b/include/dma.h index 90f9254ea80f..aeaba7d9316d 100644 --- a/include/dma.h +++ b/include/dma.h @@ -8,6 +8,7 @@ #include #include +#include #include #include @@ -56,12 +57,30 @@ static inline int dma_mapping_error(struct device_d *dev, dma_addr_t dma_addr) (dev->dma_mask && dma_addr > dev->dma_mask); } +#ifndef __PBL__ /* streaming DMA - implement the below calls to support HAS_DMA */ void dma_sync_single_for_cpu(dma_addr_t address, size_t size, enum dma_data_direction dir); void dma_sync_single_for_device(dma_addr_t address, size_t size, enum dma_data_direction dir); +#else +/* + * assumes buffers are in coherent/uncached memory, e.g. because + * MMU is only enabled in barebox_arm_entry which hasn't run yet. + */ +static inline void dma_sync_single_for_cpu(dma_addr_t address, size_t size, + enum dma_data_direction dir) +{ + barrier_data((void *)address); +} + +static inline void dma_sync_single_for_device(dma_addr_t address, size_t size, + enum dma_data_direction dir) +{ + barrier_data((void *)address); +} +#endif void *dma_alloc_coherent(size_t size, dma_addr_t *dma_handle); void dma_free_coherent(void *mem, dma_addr_t dma_handle, size_t size); -- 2.30.2 _______________________________________________ barebox mailing list barebox@lists.infradead.org http://lists.infradead.org/mailman/listinfo/barebox