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From:   Piyush Malgujar <pmalgujar@marvell.com>
To:     <linux-mmc@vger.kernel.org>, <linux-kernel@vger.kernel.org>,
        <adrian.hunter@intel.com>, <ulf.hansson@linaro.org>,
        <robh+dt@kernel.org>, <krzysztof.kozlowski+dt@linaro.org>,
        <yamada.masahiro@socionext.com>, <devicetree@vger.kernel.org>
CC:     <jannadurai@marvell.com>, <cchavva@marvell.com>,
        Piyush Malgujar <pmalgujar@marvell.com>
Subject: [PATCH 2/5] drivers: mmc: sdhci-cadence: enable MMC_SDHCI_IO_ACCESSORS
Date:   Mon, 19 Dec 2022 06:24:15 -0800
Message-ID: <20221219142418.27949-3-pmalgujar@marvell.com>
In-Reply-To: <20221219142418.27949-1-pmalgujar@marvell.com>
References: <20221219142418.27949-1-pmalgujar@marvell.com>
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From: Jayanthi Annadurai <jannadurai@marvell.com>

Add support for CONFIG_MMC_SDHCI_IO_ACCESSORS for controller
specific register read and write APIs.

Signed-off-by: Jayanthi Annadurai <jannadurai@marvell.com>
Signed-off-by: Piyush Malgujar <pmalgujar@marvell.com>
---
 drivers/mmc/host/Kconfig         | 12 ++++++
 drivers/mmc/host/sdhci-cadence.c | 63 ++++++++++++++++++++++++++++++++
 2 files changed, 75 insertions(+)

diff --git a/drivers/mmc/host/Kconfig b/drivers/mmc/host/Kconfig
index 5e19a961c34d7b5664ab2fd43cfba82dc90913ac..b5b2ae0bb4625bdb9d17acdbb1887c9caa3a1f32 100644
--- a/drivers/mmc/host/Kconfig
+++ b/drivers/mmc/host/Kconfig
@@ -262,6 +262,18 @@ config MMC_SDHCI_CADENCE
 
 	  If unsure, say N.
 
+config MMC_SDHCI_CN10K
+	tristate "SDHCI Cadence support for Marvell CN10K platforms"
+	select MMC_SDHCI_CADENCE
+	select MMC_SDHCI_IO_ACCESSORS
+	help
+	  This selects the SDHCI cadence driver and IO Accessors
+	  for Marvell CN10K platforms
+
+	  If you have Marvell CN10K platform, say Y or M here.
+
+	  If unsure, say N.
+
 config MMC_SDHCI_CNS3XXX
 	tristate "SDHCI support on the Cavium Networks CNS3xxx SoC"
 	depends on ARCH_CNS3XXX || COMPILE_TEST
diff --git a/drivers/mmc/host/sdhci-cadence.c b/drivers/mmc/host/sdhci-cadence.c
index 5332d19e489be936d6814feba4f0fc046f5e130e..6bf703f15bc5be7e3be4cb1144b78ec3585ec540 100644
--- a/drivers/mmc/host/sdhci-cadence.c
+++ b/drivers/mmc/host/sdhci-cadence.c
@@ -449,6 +449,61 @@ static u32 read_dqs_cmd_delay, clk_wrdqs_delay, clk_wr_delay, read_dqs_delay;
 
 static u32 sdhci_cdns_sd6_get_mode(struct sdhci_host *host, unsigned int timing);
 
+#ifdef CONFIG_MMC_SDHCI_IO_ACCESSORS
+static u32 sdhci_cdns_sd6_readl(struct sdhci_host *host, int reg)
+{
+	return readl(host->ioaddr + reg);
+}
+
+static void sdhci_cdns_sd6_writel(struct sdhci_host *host, u32 val, int reg)
+{
+	writel(val, host->ioaddr + reg);
+}
+
+static u16 sdhci_cdns_sd6_readw(struct sdhci_host *host, int reg)
+{
+	u32 val, regoff;
+
+	regoff = reg & ~3;
+
+	val = readl(host->ioaddr + regoff);
+	if ((reg & 0x3) == 0)
+		return (val & 0xFFFF);
+	else
+		return ((val >> 16) & 0xFFFF);
+}
+
+static void sdhci_cdns_sd6_writew(struct sdhci_host *host, u16 val, int reg)
+{
+	writew(val, host->ioaddr + reg);
+}
+
+static u8 sdhci_cdns_sd6_readb(struct sdhci_host *host, int reg)
+{
+	u32 val, regoff;
+
+	regoff = reg & ~3;
+
+	val = readl(host->ioaddr + regoff);
+	switch (reg & 3) {
+	case 0:
+		return (val & 0xFF);
+	case 1:
+		return ((val >> 8) & 0xFF);
+	case 2:
+		return ((val >> 16) & 0xFF);
+	case 3:
+		return ((val >> 24) & 0xFF);
+	}
+	return 0;
+}
+
+static void sdhci_cdns_sd6_writeb(struct sdhci_host *host, u8 val, int reg)
+{
+	writeb(val, host->ioaddr + reg);
+}
+#endif
+
 static int sdhci_cdns_sd6_phy_lock_dll(struct sdhci_cdns_sd6_phy *phy)
 {
 	u32 delay_element = phy->d.delay_element_org;
@@ -1576,6 +1631,14 @@ static const struct sdhci_ops sdhci_cdns_sd4_ops = {
 };
 
 static const struct sdhci_ops sdhci_cdns_sd6_ops = {
+#ifdef CONFIG_MMC_SDHCI_IO_ACCESSORS
+	.read_l = sdhci_cdns_sd6_readl,
+	.write_l = sdhci_cdns_sd6_writel,
+	.read_w = sdhci_cdns_sd6_readw,
+	.write_w = sdhci_cdns_sd6_writew,
+	.read_b = sdhci_cdns_sd6_readb,
+	.write_b = sdhci_cdns_sd6_writeb,
+#endif
 	.get_max_clock = sdhci_cdns_get_max_clock,
 	.set_clock = sdhci_cdns_sd6_set_clock,
 	.get_timeout_clock = sdhci_cdns_get_timeout_clock,
-- 
2.17.1