From mboxrd@z Thu Jan 1 00:00:00 1970 From: Shawn Lin Subject: [PATCH v2 6/6] mmc: sdhci-of-arasan: overwrite enhanced strobe callback Date: Fri, 29 Apr 2016 10:48:34 +0800 Message-ID: <1461898114-29067-1-git-send-email-shawn.lin@rock-chips.com> References: <1461897751-28810-1-git-send-email-shawn.lin@rock-chips.com> Return-path: In-Reply-To: <1461897751-28810-1-git-send-email-shawn.lin@rock-chips.com> Sender: linux-kernel-owner@vger.kernel.org To: Adrian Hunter , Ulf Hansson Cc: Jaehoon Chung , Michal Simek , soren.brinkmann@xilinx.com, Rob Herring , linux-mmc@vger.kernel.org, linux-kernel@vger.kernel.org, Doug Anderson , 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'r sure our controller can support it. Signed-off-by: Shawn Lin --- Changes in v2: None drivers/mmc/host/sdhci-of-arasan.c | 22 ++++++++++++++++++++++ 1 file changed, 22 insertions(+) diff --git a/drivers/mmc/host/sdhci-of-arasan.c b/drivers/mmc/host/sdhci-of-arasan.c index 20b859e..a0e4536 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 @@ -73,6 +75,23 @@ static void sdhci_arasan_set_clock(struct sdhci_host *host, unsigned int clock) phy_power_on(sdhci_arasan->phy); } +static int sdhci_arasan_enhanced_strobe(struct mmc_host *mmc, + bool enable) +{ + u32 vendor; + struct sdhci_host *host = mmc_priv(mmc); + + vendor = readl(host->ioaddr + SDHCI_ARASAN_VENDOR_REGISTER); + if (enable) + vendor |= VENDOR_ENHANCED_STROBE; + else + vendor &= (~VENDOR_ENHANCED_STROBE); + + writel(vendor, host->ioaddr + SDHCI_ARASAN_VENDOR_REGISTER); + + return 0; +} + static struct sdhci_ops sdhci_arasan_ops = { .set_clock = sdhci_arasan_set_clock, .get_max_clock = sdhci_pltfm_clk_get_max_clock, @@ -239,6 +258,9 @@ 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.prepare_enhanced_strobe = + sdhci_arasan_enhanced_strobe; } ret = sdhci_add_host(host); -- 2.3.7