mmc: Add support for the Marvell Dove SDHCI controller

Implement an sdhci-pltfm driver for the controller found in the
Marvell Dove SoC.

Signed-off-by: Mike Rapoport <mike@compulab.co.il>
CC: Saeed Bishara <saeed@marvell.com>
Acked-by: Wolfram Sang <w.sang@pengutronix.de>
Signed-off-by: Chris Ball <cjb@laptop.org>

5 files changed, 86 insertions, 0 deletions

diff --git a/drivers/mmc/host/Kconfig b/drivers/mmc/host/Kconfig
index d618e8673996..f8fa9efca8ee 100644
--- a/drivers/mmc/host/Kconfig
+++ b/drivers/mmc/host/Kconfig
@@ -140,6 +140,17 @@ config MMC_SDHCI_ESDHC_IMX
 
           If unsure, say N.
 
+config MMC_SDHCI_DOVE
+        bool "SDHCI support on Marvell's Dove SoC"
+        depends on ARCH_DOVE
+        depends on MMC_SDHCI_PLTFM
+        select MMC_SDHCI_IO_ACCESSORS
+        help
+          This selects the Secure Digital Host Controller Interface in
+          Marvell's Dove SoC.
+
+          If unsure, say N.
+
 config MMC_SDHCI_S3C
         tristate "SDHCI support on Samsung S3C SoC"
         depends on MMC_SDHCI && PLAT_SAMSUNG
diff --git a/drivers/mmc/host/Makefile b/drivers/mmc/host/Makefile
index 7b645ff43b30..d91364d4bf39 100644
--- a/drivers/mmc/host/Makefile
+++ b/drivers/mmc/host/Makefile
@@ -39,6 +39,7 @@ obj-$(CONFIG_MMC_SDHCI_PLTFM)			+= sdhci-platform.o
 sdhci-platform-y                                := sdhci-pltfm.o
 sdhci-platform-$(CONFIG_MMC_SDHCI_CNS3XXX)      += sdhci-cns3xxx.o
 sdhci-platform-$(CONFIG_MMC_SDHCI_ESDHC_IMX)    += sdhci-esdhc-imx.o
+sdhci-platform-$(CONFIG_MMC_SDHCI_DOVE)         += sdhci-dove.o
 
 obj-$(CONFIG_MMC_SDHCI_OF)      += sdhci-of.o
 sdhci-of-y                              := sdhci-of-core.o
diff --git a/drivers/mmc/host/sdhci-dove.c b/drivers/mmc/host/sdhci-dove.c
new file mode 100644
index 000000000000..2aeef4ffed8c
--- /dev/null
+++ b/drivers/mmc/host/sdhci-dove.c
@@ -0,0 +1,70 @@
+/*
+ * sdhci-dove.c Support for SDHCI on Marvell's Dove SoC
+ *
+ * Author: Saeed Bishara <saeed@marvell.com>
+ *         Mike Rapoport <mike@compulab.co.il>
+ * Based on sdhci-cns3xxx.c
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+ */
+
+#include <linux/io.h>
+#include <linux/mmc/host.h>
+
+#include "sdhci.h"
+#include "sdhci-pltfm.h"
+
+static u16 sdhci_dove_readw(struct sdhci_host *host, int reg)
+{
+        u16 ret;
+
+        switch (reg) {
+        case SDHCI_HOST_VERSION:
+        case SDHCI_SLOT_INT_STATUS:
+                /* those registers don't exist */
+                return 0;
+        default:
+                ret = readw(host->ioaddr + reg);
+        }
+        return ret;
+}
+
+static u32 sdhci_dove_readl(struct sdhci_host *host, int reg)
+{
+        u32 ret;
+
+        switch (reg) {
+        case SDHCI_CAPABILITIES:
+                ret = readl(host->ioaddr + reg);
+                /* Mask the support for 3.0V */
+                ret &= ~SDHCI_CAN_VDD_300;
+                break;
+        default:
+                ret = readl(host->ioaddr + reg);
+        }
+        return ret;
+}
+
+static struct sdhci_ops sdhci_dove_ops = {
+        .read_w = sdhci_dove_readw,
+        .read_l = sdhci_dove_readl,
+};
+
+struct sdhci_pltfm_data sdhci_dove_pdata = {
+        .ops    = &sdhci_dove_ops,
+        .quirks = SDHCI_QUIRK_NO_SIMULT_VDD_AND_POWER |
+                  SDHCI_QUIRK_NO_BUSY_IRQ |
+                  SDHCI_QUIRK_BROKEN_TIMEOUT_VAL |
+                  SDHCI_QUIRK_FORCE_DMA,
+};
diff --git a/drivers/mmc/host/sdhci-pltfm.c b/drivers/mmc/host/sdhci-pltfm.c
index 0502f89f662b..91c6766c660c 100644
--- a/drivers/mmc/host/sdhci-pltfm.c
+++ b/drivers/mmc/host/sdhci-pltfm.c
@@ -170,6 +170,9 @@ static const struct platform_device_id sdhci_pltfm_ids[] = {
 #ifdef CONFIG_MMC_SDHCI_ESDHC_IMX
         { "sdhci-esdhc-imx", (kernel_ulong_t)&sdhci_esdhc_imx_pdata },
 #endif
+#ifdef CONFIG_MMC_SDHCI_DOVE
+        { "sdhci-dove", (kernel_ulong_t)&sdhci_dove_pdata },
+#endif
         { },
 };
 MODULE_DEVICE_TABLE(platform, sdhci_pltfm_ids);
diff --git a/drivers/mmc/host/sdhci-pltfm.h b/drivers/mmc/host/sdhci-pltfm.h
index c1bfe48af56a..62118b9f9d0a 100644
--- a/drivers/mmc/host/sdhci-pltfm.h
+++ b/drivers/mmc/host/sdhci-pltfm.h
@@ -22,5 +22,6 @@ struct sdhci_pltfm_host {
 
 extern struct sdhci_pltfm_data sdhci_cns3xxx_pdata;
 extern struct sdhci_pltfm_data sdhci_esdhc_imx_pdata;
+extern struct sdhci_pltfm_data sdhci_dove_pdata;
 
 #endif /* _DRIVERS_MMC_SDHCI_PLTFM_H */