linux-kernel - [PATCH v2] mmc: sdhci: use lower/upper_32

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Message-Id: <20190829112206.22213-1-yamada.masahiro@socionext.com>
Date:   Thu, 29 Aug 2019 20:22:06 +0900
From:   Masahiro Yamada <yamada.masahiro@...ionext.com>
To:     linux-mmc@...r.kernel.org, Adrian Hunter <adrian.hunter@...el.com>,
        Ulf Hansson <ulf.hansson@...aro.org>
Cc:     Piotr Sroka <piotrs@...ence.com>,
        Masahiro Yamada <yamada.masahiro@...ionext.com>,
        linux-kernel@...r.kernel.org
Subject: [PATCH v2] mmc: sdhci: use lower/upper_32_bits() macros for DMA addresses

Currently, the DMA addresses are casted to (u64) for the upper 32bits
to avoid "right shift count >= width of type" warning.

<linux/kernel.h> provides macros to address this, and I like the macro
names are self-documenting.

I introduced a new helper, sdhci_set_adma_addr() to avoid the code
duplication.

Signed-off-by: Masahiro Yamada <yamada.masahiro@...ionext.com>
---

Changes in v2:
  - Another way to reduce linu wrapping

 drivers/mmc/host/sdhci.c | 27 +++++++++++++--------------
 1 file changed, 13 insertions(+), 14 deletions(-)

diff --git a/drivers/mmc/host/sdhci.c b/drivers/mmc/host/sdhci.c
index 08cc0792c174..66c2cf89ee22 100644
--- a/drivers/mmc/host/sdhci.c
+++ b/drivers/mmc/host/sdhci.c
@@ -668,10 +668,10 @@ void sdhci_adma_write_desc(struct sdhci_host *host, void **desc,
 	/* 32-bit and 64-bit descriptors have these members in same position */
 	dma_desc->cmd = cpu_to_le16(cmd);
 	dma_desc->len = cpu_to_le16(len);
-	dma_desc->addr_lo = cpu_to_le32((u32)addr);
+	dma_desc->addr_lo = cpu_to_le32(lower_32_bits(addr));
 
 	if (host->flags & SDHCI_USE_64_BIT_DMA)
-		dma_desc->addr_hi = cpu_to_le32((u64)addr >> 32);
+		dma_desc->addr_hi = cpu_to_le32(upper_32_bits(addr));
 
 	*desc += host->desc_sz;
 }
@@ -816,6 +816,13 @@ static void sdhci_adma_table_post(struct sdhci_host *host,
 	}
 }
 
+static void sdhci_set_adma_addr(struct sdhci_host *host, dma_addr_t addr)
+{
+	sdhci_writel(host, lower_32_bits(addr), SDHCI_ADMA_ADDRESS);
+	if (host->flags & SDHCI_USE_64_BIT_DMA)
+		sdhci_writel(host, upper_32_bits(addr), SDHCI_ADMA_ADDRESS_HI);
+}
+
 static dma_addr_t sdhci_sdma_address(struct sdhci_host *host)
 {
 	if (host->bounce_buffer)
@@ -826,13 +833,10 @@ static dma_addr_t sdhci_sdma_address(struct sdhci_host *host)
 
 static void sdhci_set_sdma_addr(struct sdhci_host *host, dma_addr_t addr)
 {
-	if (host->v4_mode) {
-		sdhci_writel(host, addr, SDHCI_ADMA_ADDRESS);
-		if (host->flags & SDHCI_USE_64_BIT_DMA)
-			sdhci_writel(host, (u64)addr >> 32, SDHCI_ADMA_ADDRESS_HI);
-	} else {
+	if (host->v4_mode)
+		sdhci_set_adma_addr(host, addr);
+	else
 		sdhci_writel(host, addr, SDHCI_DMA_ADDRESS);
-	}
 }
 
 static unsigned int sdhci_target_timeout(struct sdhci_host *host,
@@ -1095,12 +1099,7 @@ static void sdhci_prepare_data(struct sdhci_host *host, struct mmc_command *cmd)
 			host->flags &= ~SDHCI_REQ_USE_DMA;
 		} else if (host->flags & SDHCI_USE_ADMA) {
 			sdhci_adma_table_pre(host, data, sg_cnt);
-
-			sdhci_writel(host, host->adma_addr, SDHCI_ADMA_ADDRESS);
-			if (host->flags & SDHCI_USE_64_BIT_DMA)
-				sdhci_writel(host,
-					     (u64)host->adma_addr >> 32,
-					     SDHCI_ADMA_ADDRESS_HI);
+			sdhci_set_adma_addr(host, host->adma_addr);
 		} else {
 			WARN_ON(sg_cnt != 1);
 			sdhci_set_sdma_addr(host, sdhci_sdma_address(host));
-- 
2.17.1