[PATCH 1/4] ata: ahci_mvebu: new driver for Marvell Armada 380 AHCI interfaces
Thomas Petazzoni
thomas.petazzoni at free-electrons.com
Mon Apr 7 07:57:41 PDT 2014
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 at free-electrons.com>
---
.../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 at free-electrons.com>
+ * Marcin Wojtas <mw at semihalf.com>
+ *
+ * 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 at free-electrons.com>, Marcin Wojtas <mw at semihalf.com>");
+MODULE_LICENSE("GPL");
+MODULE_ALIAS("platform:ahci_mv");
--
1.8.3.2
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