[PATCH 1/4] ata: ahci_mvebu: new driver for Marvell Armada 380 AHCI interfaces

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The Marvell Armada 380 SoC includes two AHCI compatible
interfaces. However, like all DMA-capable Marvell interface, they
require special handling to configure MBus windows. Therefore, this
commit adds a new ahci_mvebu driver, which relies on the
libahci_platform.c code recently introduced.

Signed-off-by: Thomas Petazzoni <thomas.petazzoni@xxxxxxxxxxxxxxxxxx>
---
 .../devicetree/bindings/ata/ahci-platform.txt      |   3 +-
 drivers/ata/Kconfig                                |   9 ++
 drivers/ata/Makefile                               |   1 +
 drivers/ata/ahci_mvebu.c                           | 105 +++++++++++++++++++++
 4 files changed, 117 insertions(+), 1 deletion(-)
 create mode 100644 drivers/ata/ahci_mvebu.c

diff --git a/Documentation/devicetree/bindings/ata/ahci-platform.txt b/Documentation/devicetree/bindings/ata/ahci-platform.txt
index 48b285f..271746d 100644
--- a/Documentation/devicetree/bindings/ata/ahci-platform.txt
+++ b/Documentation/devicetree/bindings/ata/ahci-platform.txt
@@ -7,7 +7,8 @@ Required properties:
 - compatible        : compatible list, one of "snps,spear-ahci",
                       "snps,exynos5440-ahci", "ibm,476gtr-ahci",
                       "allwinner,sun4i-a10-ahci", "fsl,imx53-ahci"
-                      "fsl,imx6q-ahci" or "snps,dwc-ahci"
+                      "fsl,imx6q-ahci", "snps,dwc-ahci" or
+                      "marvell,armada-380-ahci"
 - interrupts        : <interrupt mapping for SATA IRQ>
 - reg               : <registers mapping>
 
diff --git a/drivers/ata/Kconfig b/drivers/ata/Kconfig
index 2e4da3b..cb987e9 100644
--- a/drivers/ata/Kconfig
+++ b/drivers/ata/Kconfig
@@ -123,6 +123,15 @@ config AHCI_IMX
 
 	  If unsure, say N.
 
+config AHCI_MVEBU
+	tristate "Marvell EBU AHCI SATA support"
+	depends on ARCH_MVEBU
+	help
+	  This option enables support for the Marvebu EBU SoC's
+	  onboard AHCI SATA.
+
+	  If unsure, say N.
+
 config AHCI_SUNXI
 	tristate "Allwinner sunxi AHCI SATA support"
 	depends on ARCH_SUNXI
diff --git a/drivers/ata/Makefile b/drivers/ata/Makefile
index 44c8016..5a02aee 100644
--- a/drivers/ata/Makefile
+++ b/drivers/ata/Makefile
@@ -12,6 +12,7 @@ obj-$(CONFIG_SATA_DWC)		+= sata_dwc_460ex.o
 obj-$(CONFIG_SATA_HIGHBANK)	+= sata_highbank.o libahci.o
 obj-$(CONFIG_AHCI_DA850)	+= ahci_da850.o libahci.o libahci_platform.o
 obj-$(CONFIG_AHCI_IMX)		+= ahci_imx.o libahci.o libahci_platform.o
+obj-$(CONFIG_AHCI_MVEBU)	+= ahci_mvebu.o libahci.o libahci_platform.o
 obj-$(CONFIG_AHCI_SUNXI)	+= ahci_sunxi.o libahci.o libahci_platform.o
 obj-$(CONFIG_AHCI_ST)		+= ahci_st.o libahci.o libahci_platform.o
 obj-$(CONFIG_AHCI_XGENE)	+= ahci_xgene.o libahci.o libahci_platform.o
diff --git a/drivers/ata/ahci_mvebu.c b/drivers/ata/ahci_mvebu.c
new file mode 100644
index 0000000..ca90b18
--- /dev/null
+++ b/drivers/ata/ahci_mvebu.c
@@ -0,0 +1,105 @@
+/*
+ * AHCI glue platform driver for Marvell EBU SOCs
+ *
+ * Copyright (C) 2014 Marvell
+ *
+ * Thomas Petazzoni <thomas.petazzoni@xxxxxxxxxxxxxxxxxx>
+ * Marcin Wojtas <mw@xxxxxxxxxxxx>
+ *
+ * This file is licensed under the terms of the GNU General Public
+ * License version 2.  This program is licensed "as is" without any
+ * warranty of any kind, whether express or implied.
+ */
+
+#include <linux/ahci_platform.h>
+#include <linux/kernel.h>
+#include <linux/mbus.h>
+#include <linux/module.h>
+#include <linux/of_device.h>
+#include <linux/platform_device.h>
+#include "ahci.h"
+
+#define AHCI_WINDOW_CTRL(win)	(0x60 + ((win) << 4))
+#define AHCI_WINDOW_BASE(win)	(0x64 + ((win) << 4))
+#define AHCI_WINDOW_SIZE(win)	(0x68 + ((win) << 4))
+
+static void ahci_mvebu_mbus_config(struct ahci_host_priv *hpriv,
+				   const struct mbus_dram_target_info *dram)
+{
+	int i;
+
+	for (i = 0; i < 4; i++) {
+		writel(0, hpriv->mmio + AHCI_WINDOW_CTRL(i));
+		writel(0, hpriv->mmio + AHCI_WINDOW_BASE(i));
+		writel(0, hpriv->mmio + AHCI_WINDOW_SIZE(i));
+	}
+
+	for (i = 0; i < dram->num_cs; i++) {
+		const struct mbus_dram_window *cs = dram->cs + i;
+
+		writel((cs->mbus_attr << 8) |
+		       (dram->mbus_dram_target_id << 4) | 1,
+		       hpriv->mmio + AHCI_WINDOW_CTRL(i));
+		writel(cs->base, hpriv->mmio + AHCI_WINDOW_BASE(i));
+		writel(((cs->size - 1) & 0xffff0000),
+		       hpriv->mmio + AHCI_WINDOW_SIZE(i));
+	}
+}
+
+static const struct ata_port_info ahci_mvebu_port_info = {
+	.flags	   = AHCI_FLAG_COMMON,
+	.pio_mask  = ATA_PIO4,
+	.udma_mask = ATA_UDMA6,
+	.port_ops  = &ahci_platform_ops,
+};
+
+static int ahci_mvebu_probe(struct platform_device *pdev)
+{
+	struct ahci_host_priv *hpriv;
+	const struct mbus_dram_target_info *dram;
+	int rc;
+
+	hpriv = ahci_platform_get_resources(pdev);
+	if (IS_ERR(hpriv))
+		return PTR_ERR(hpriv);
+
+	rc = ahci_platform_enable_resources(hpriv);
+	if (rc)
+		return rc;
+
+	dram = mv_mbus_dram_info();
+	if (dram)
+		ahci_mvebu_mbus_config(hpriv, dram);
+
+	rc = ahci_platform_init_host(pdev, hpriv, &ahci_mvebu_port_info, 0, 0);
+	if (rc)
+		goto disable_resources;
+
+	return 0;
+
+disable_resources:
+	ahci_platform_disable_resources(hpriv);
+	return rc;
+}
+
+static const struct of_device_id ahci_mvebu_of_match[] = {
+	{ .compatible = "marvell,armada-380-ahci", },
+	{ },
+};
+MODULE_DEVICE_TABLE(of, ahci_mvebu_of_match);
+
+static struct platform_driver ahci_mvebu_driver = {
+	.probe = ahci_mvebu_probe,
+	.remove = ata_platform_remove_one,
+	.driver = {
+		.name = "ahci-mvebu",
+		.owner = THIS_MODULE,
+		.of_match_table = ahci_mvebu_of_match,
+	},
+};
+module_platform_driver(ahci_mvebu_driver);
+
+MODULE_DESCRIPTION("Marvell EBU AHCI SATA driver");
+MODULE_AUTHOR("Thomas Petazzoni <thomas.petazzoni@xxxxxxxxxxxxxxxxxx>, Marcin Wojtas <mw@xxxxxxxxxxxx>");
+MODULE_LICENSE("GPL");
+MODULE_ALIAS("platform:ahci_mv");
-- 
1.8.3.2

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