From mboxrd@z Thu Jan 1 00:00:00 1970 From: Shawn Lin Subject: [PATCH v4 5/5] mmc: sdhci-of-arasan: implement enhanced strobe callback Date: Fri, 20 May 2016 16:36:17 +0800 Message-ID: <1463733377-986-1-git-send-email-shawn.lin@rock-chips.com> References: <1463733285-770-1-git-send-email-shawn.lin@rock-chips.com> Return-path: In-Reply-To: <1463733285-770-1-git-send-email-shawn.lin@rock-chips.com> Sender: linux-kernel-owner@vger.kernel.org To: Ulf Hansson Cc: Adrian Hunter , Jaehoon Chung , Michal Simek , soren.brinkmann@xilinx.com, Rob Herring , linux-mmc@vger.kernel.org, linux-kernel@vger.kernel.org, Doug Anderson , Brian Norris , Heiko Stuebner , linux-rockchip@lists.infradead.org, devicetree@vger.kernel.org, Shawn Lin List-Id: devicetree@vger.kernel.org Currently sdhci-arasan 5.1 can support enhanced strobe function, and we now limit it just for "arasan,sdhci-5.1". Add mmc-hs400-enhanced-strobe in DT to enable the function if we're sure our controller can support it. Signed-off-by: Shawn Lin Reviewed-by: Doug Anderson --- Changes in v4: None Changes in v3: None Changes in v2: None drivers/mmc/host/sdhci-of-arasan.c | 20 ++++++++++++++++++++ 1 file changed, 20 insertions(+) diff --git a/drivers/mmc/host/sdhci-of-arasan.c b/drivers/mmc/host/sdhci-of-arasan.c index b6f4c1d..533e2bc 100644 --- a/drivers/mmc/host/sdhci-of-arasan.c +++ b/drivers/mmc/host/sdhci-of-arasan.c @@ -25,7 +25,9 @@ #include "sdhci-pltfm.h" #define SDHCI_ARASAN_CLK_CTRL_OFFSET 0x2c +#define SDHCI_ARASAN_VENDOR_REGISTER 0x78 +#define VENDOR_ENHANCED_STROBE BIT(0) #define CLK_CTRL_TIMEOUT_SHIFT 16 #define CLK_CTRL_TIMEOUT_MASK (0xf << CLK_CTRL_TIMEOUT_SHIFT) #define CLK_CTRL_TIMEOUT_MIN_EXP 13 @@ -79,6 +81,21 @@ static void sdhci_arasan_set_clock(struct sdhci_host *host, unsigned int clock) } } +static void sdhci_arasan_hs400_enhanced_strobe(struct mmc_host *mmc, + struct mmc_ios *ios) +{ + u32 vendor; + struct sdhci_host *host = mmc_priv(mmc); + + vendor = readl(host->ioaddr + SDHCI_ARASAN_VENDOR_REGISTER); + if (ios->enhanced_strobe) + vendor |= VENDOR_ENHANCED_STROBE; + else + vendor &= ~VENDOR_ENHANCED_STROBE; + + writel(vendor, host->ioaddr + SDHCI_ARASAN_VENDOR_REGISTER); +} + static struct sdhci_ops sdhci_arasan_ops = { .set_clock = sdhci_arasan_set_clock, .get_max_clock = sdhci_pltfm_clk_get_max_clock, @@ -245,6 +262,9 @@ static int sdhci_arasan_probe(struct platform_device *pdev) dev_err(&pdev->dev, "phy_power_on err.\n"); goto err_phy_power; } + + host->mmc_host_ops.hs400_enhanced_strobe = + sdhci_arasan_hs400_enhanced_strobe; } ret = sdhci_add_host(host); -- 2.3.7