linux-kernel - [PATCH v2 3/5] drivers: mmc: sdhci-cadence: enable MMC_SDHCI_IO

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Date:   Mon, 23 Jan 2023 11:27:33 -0800
From:   Piyush Malgujar <pmalgujar@...vell.com>
To:     <linux-mmc@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        <adrian.hunter@...el.com>, <ulf.hansson@...aro.org>,
        <robh+dt@...nel.org>, <krzysztof.kozlowski+dt@...aro.org>,
        <yamada.masahiro@...ionext.com>, <devicetree@...r.kernel.org>
CC:     <jannadurai@...vell.com>, <cchavva@...vell.com>,
        Piyush Malgujar <pmalgujar@...vell.com>
Subject: [PATCH v2 3/5] drivers: mmc: sdhci-cadence: enable MMC_SDHCI_IO_ACCESSORS

From: Jayanthi Annadurai <jannadurai@...vell.com>

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

Signed-off-by: Jayanthi Annadurai <jannadurai@...vell.com>
Signed-off-by: Piyush Malgujar <pmalgujar@...vell.com>
---
 drivers/mmc/host/Kconfig         |  1 +
 drivers/mmc/host/sdhci-cadence.c | 63 ++++++++++++++++++++++++++++++++
 2 files changed, 64 insertions(+)

diff --git a/drivers/mmc/host/Kconfig b/drivers/mmc/host/Kconfig
index 5e19a961c34d7b5664ab2fd43cfba82dc90913ac..9e41115cc753aaf577a9c01c293ec602ce1e3f52 100644
--- a/drivers/mmc/host/Kconfig
+++ b/drivers/mmc/host/Kconfig
@@ -255,6 +255,7 @@ config MMC_SDHCI_CADENCE
 	tristate "SDHCI support for the Cadence SD/SDIO/eMMC controller"
 	depends on MMC_SDHCI_PLTFM
 	depends on OF
+	select MMC_SDHCI_IO_ACCESSORS
 	help
 	  This selects the Cadence SD/SDIO/eMMC driver.
 
diff --git a/drivers/mmc/host/sdhci-cadence.c b/drivers/mmc/host/sdhci-cadence.c
index 03895b519061e7d3424742ce779d94b12ecf4ab8..baee0f98deac975ab92cf3e09a1edec5d3a59021 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