From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 3A1CEC433FE for ; Tue, 3 May 2022 22:52:22 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S243910AbiECWzx (ORCPT ); Tue, 3 May 2022 18:55:53 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:41364 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S243966AbiECWzd (ORCPT ); Tue, 3 May 2022 18:55:33 -0400 Received: from mail.baikalelectronics.ru (mail.baikalelectronics.com [87.245.175.226]) by lindbergh.monkeyblade.net (Postfix) with ESMTP id ED0CB433BE; Tue, 3 May 2022 15:51:33 -0700 (PDT) Received: from mail.baikalelectronics.ru (unknown [192.168.51.25]) by mail.baikalelectronics.ru (Postfix) with ESMTP id 3E5C5C08; Wed, 4 May 2022 01:52:07 +0300 (MSK) DKIM-Filter: OpenDKIM Filter v2.11.0 mail.baikalelectronics.ru 3E5C5C08 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=baikalelectronics.ru; s=mail; t=1651618327; bh=mlbrREDWnaYRYCU292g215ETXH93C3iQ6RN6HiEltyY=; h=From:To:CC:Subject:Date:In-Reply-To:References:From; b=c3X+0SoGAyf5cwpKv+JF10ZSGkfGchJGwy97QGr39nfvBUkAGMhL4T6rd7JuLONa7 hGZfHycsBF6zYUWtSokWNsr3MViHuMLOVvBKjM300vF//rGVnAbCTKyaMD+ti00LK0 Ufd9jwM44MzUqUGmoKckLLd/+ZVkDG9UGz7seGi0= Received: from localhost (192.168.53.207) by mail (192.168.51.25) with Microsoft SMTP Server (TLS) id 15.0.1395.4; Wed, 4 May 2022 01:51:33 +0300 From: Serge Semin To: Gustavo Pimentel , Vinod Koul , Jingoo Han , Bjorn Helgaas , Lorenzo Pieralisi , Frank Li , Manivannan Sadhasivam CC: Serge Semin , Serge Semin , Alexey Malahov , Pavel Parkhomenko , Rob Herring , =?UTF-8?q?Krzysztof=20Wilczy=C5=84ski?= , , , Subject: [PATCH v2 20/26] dmaengine: dw-edma: Use non-atomic io-64 methods Date: Wed, 4 May 2022 01:50:58 +0300 Message-ID: <20220503225104.12108-21-Sergey.Semin@baikalelectronics.ru> In-Reply-To: <20220503225104.12108-1-Sergey.Semin@baikalelectronics.ru> References: <20220503225104.12108-1-Sergey.Semin@baikalelectronics.ru> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Content-Type: text/plain X-ClientProxiedBy: MAIL.baikal.int (192.168.51.25) To mail (192.168.51.25) Precedence: bulk List-ID: X-Mailing-List: linux-pci@vger.kernel.org Instead of splitting the 64-bits IOs up into two 32-bits ones it's possible to use an available set of the non-atomic readq/writeq methods implemented exactly for such cases. They are defined in the dedicated header files io-64-nonatomic-lo-hi.h/io-64-nonatomic-hi-lo.h. So in case if the 64-bits readq/writeq methods are unavailable on some platforms at consideration, the corresponding drivers can have any of these headers included and stop locally re-implementing the 64-bits IO accessors taking into account the non-atomic nature of the included methods. Let's do that in the DW eDMA driver too. Note by doing so we can discard the CONFIG_64BIT config ifdefs from the code. Also note that if a platform doesn't support 64-bit DBI IOs then the corresponding accessors will just directly call the lo_hi_readq()/lo_hi_writeq() methods. Signed-off-by: Serge Semin --- drivers/dma/dw-edma/dw-edma-v0-core.c | 71 +++++++++------------------ 1 file changed, 24 insertions(+), 47 deletions(-) diff --git a/drivers/dma/dw-edma/dw-edma-v0-core.c b/drivers/dma/dw-edma/dw-edma-v0-core.c index e6d611176891..4348d2323125 100644 --- a/drivers/dma/dw-edma/dw-edma-v0-core.c +++ b/drivers/dma/dw-edma/dw-edma-v0-core.c @@ -8,6 +8,8 @@ #include +#include + #include "dw-edma-core.h" #include "dw-edma-v0-core.h" #include "dw-edma-v0-regs.h" @@ -53,8 +55,6 @@ static inline struct dw_edma_v0_regs __iomem *__dw_regs(struct dw_edma *dw) SET_32(dw, rd_##name, value); \ } while (0) -#ifdef CONFIG_64BIT - #define SET_64(dw, name, value) \ writeq(value, &(__dw_regs(dw)->name)) @@ -80,8 +80,6 @@ static inline struct dw_edma_v0_regs __iomem *__dw_regs(struct dw_edma *dw) SET_64(dw, rd_##name, value); \ } while (0) -#endif /* CONFIG_64BIT */ - #define SET_COMPAT(dw, name, value) \ writel(value, &(__dw_regs(dw)->type.unroll.name)) @@ -164,14 +162,13 @@ static inline u32 readl_ch(struct dw_edma *dw, enum dw_edma_dir dir, u16 ch, #define SET_LL_32(ll, value) \ writel(value, ll) -#ifdef CONFIG_64BIT - static inline void writeq_ch(struct dw_edma *dw, enum dw_edma_dir dir, u16 ch, u64 value, void __iomem *addr) { + unsigned long flags; + if (dw->chip->mf == EDMA_MF_EDMA_LEGACY) { u32 viewport_sel; - unsigned long flags; raw_spin_lock_irqsave(&dw->lock, flags); @@ -181,22 +178,25 @@ static inline void writeq_ch(struct dw_edma *dw, enum dw_edma_dir dir, u16 ch, writel(viewport_sel, &(__dw_regs(dw)->type.legacy.viewport_sel)); + } + + if (dw->chip->flags & DW_EDMA_CHIP_32BIT_DBI) + lo_hi_writeq(value, addr); + else writeq(value, addr); + if (dw->chip->mf == EDMA_MF_EDMA_LEGACY) raw_spin_unlock_irqrestore(&dw->lock, flags); - } else { - writeq(value, addr); - } } static inline u64 readq_ch(struct dw_edma *dw, enum dw_edma_dir dir, u16 ch, const void __iomem *addr) { - u32 value; + unsigned long flags; + u64 value; if (dw->chip->mf == EDMA_MF_EDMA_LEGACY) { u32 viewport_sel; - unsigned long flags; raw_spin_lock_irqsave(&dw->lock, flags); @@ -206,12 +206,15 @@ static inline u64 readq_ch(struct dw_edma *dw, enum dw_edma_dir dir, u16 ch, writel(viewport_sel, &(__dw_regs(dw)->type.legacy.viewport_sel)); + } + + if (dw->chip->flags & DW_EDMA_CHIP_32BIT_DBI) + value = lo_hi_readq(addr); + else value = readq(addr); + if (dw->chip->mf == EDMA_MF_EDMA_LEGACY) raw_spin_unlock_irqrestore(&dw->lock, flags); - } else { - value = readq(addr); - } return value; } @@ -225,8 +228,6 @@ static inline u64 readq_ch(struct dw_edma *dw, enum dw_edma_dir dir, u16 ch, #define SET_LL_64(ll, value) \ writeq(value, ll) -#endif /* CONFIG_64BIT */ - /* eDMA management callbacks */ void dw_edma_v0_core_off(struct dw_edma *dw) { @@ -325,19 +326,10 @@ static void dw_edma_v0_core_write_chunk(struct dw_edma_chunk *chunk) /* Transfer size */ SET_LL_32(&lli[i].transfer_size, child->sz); /* SAR */ - #ifdef CONFIG_64BIT - SET_LL_64(&lli[i].sar.reg, child->sar); - #else /* CONFIG_64BIT */ - SET_LL_32(&lli[i].sar.lsb, lower_32_bits(child->sar)); - SET_LL_32(&lli[i].sar.msb, upper_32_bits(child->sar)); - #endif /* CONFIG_64BIT */ + SET_LL_64(&lli[i].sar.reg, child->sar); /* DAR */ - #ifdef CONFIG_64BIT - SET_LL_64(&lli[i].dar.reg, child->dar); - #else /* CONFIG_64BIT */ - SET_LL_32(&lli[i].dar.lsb, lower_32_bits(child->dar)); - SET_LL_32(&lli[i].dar.msb, upper_32_bits(child->dar)); - #endif /* CONFIG_64BIT */ + SET_LL_64(&lli[i].dar.reg, child->dar); + i++; } @@ -349,12 +341,7 @@ static void dw_edma_v0_core_write_chunk(struct dw_edma_chunk *chunk) /* Channel control */ SET_LL_32(&llp->control, control); /* Linked list */ - #ifdef CONFIG_64BIT - SET_LL_64(&llp->llp.reg, chunk->ll_region.paddr); - #else /* CONFIG_64BIT */ - SET_LL_32(&llp->llp.lsb, lower_32_bits(chunk->ll_region.paddr)); - SET_LL_32(&llp->llp.msb, upper_32_bits(chunk->ll_region.paddr)); - #endif /* CONFIG_64BIT */ + SET_LL_64(&llp->llp.reg, chunk->ll_region.paddr); } void dw_edma_v0_core_start(struct dw_edma_chunk *chunk, bool first) @@ -417,18 +404,8 @@ void dw_edma_v0_core_start(struct dw_edma_chunk *chunk, bool first) SET_CH_32(dw, chan->dir, chan->id, ch_control1, (DW_EDMA_V0_CCS | DW_EDMA_V0_LLE)); /* Linked list */ - if ((chan->dw->chip->flags & DW_EDMA_CHIP_32BIT_DBI) || - !IS_ENABLED(CONFIG_64BIT)) { - SET_CH_32(dw, chan->dir, chan->id, llp.lsb, - lower_32_bits(chunk->ll_region.paddr)); - SET_CH_32(dw, chan->dir, chan->id, llp.msb, - upper_32_bits(chunk->ll_region.paddr)); - } else { - #ifdef CONFIG_64BIT - SET_CH_64(dw, chan->dir, chan->id, llp.reg, - chunk->ll_region.paddr); - #endif - } + SET_CH_64(dw, chan->dir, chan->id, llp.reg, + chunk->ll_region.paddr); } /* Doorbell */ SET_RW_32(dw, chan->dir, doorbell, -- 2.35.1