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Commit a3464ed2 authored by Thomas Petazzoni's avatar Thomas Petazzoni Committed by Tejun Heo
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ata: ahci_mvebu: new driver for Marvell Armada 380 AHCI interfaces 



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: default avatarThomas Petazzoni <thomas.petazzoni@free-electrons.com>
Acked-by: default avatarJason Cooper <jason@lakedaemon.net>
Signed-off-by: default avatarTejun Heo <tj@kernel.org>
parent 5799d6d4

Documentation/devicetree/bindings/ata/ahci-platform.txt

+1 −0
Original line number Diff line number Diff line
@@ -9,6 +9,7 @@ Required properties: 
  - "fsl,imx53-ahci"

  - "fsl,imx6q-ahci"

  - "ibm,476gtr-ahci"

  - "marvell,armada-380-ahci"

  - "snps,dwc-ahci"

  - "snps,exynos5440-ahci"

  - "snps,spear-ahci"

drivers/ata/Kconfig

+9 −0
Original line number Diff line number Diff line
@@ -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

drivers/ata/Makefile

+1 −0
Original line number Diff line number Diff line
@@ -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

drivers/ata/ahci_mvebu.c

0 → 100644
+127 −0
Original line number Diff line number Diff line 
/*

 * AHCI glue platform driver for Marvell EBU SOCs

 *

 * Copyright (C) 2014 Marvell

 *

 * Thomas Petazzoni <thomas.petazzoni@free-electrons.com>

 * Marcin Wojtas <mw@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_VENDOR_SPECIFIC_0_ADDR  0xa0

#define AHCI_VENDOR_SPECIFIC_0_DATA  0xa4



#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 void ahci_mvebu_regret_option(struct ahci_host_priv *hpriv)

{

	/*

	 * Enable the regret bit to allow the SATA unit to regret a

	 * request that didn't receive an acknowlegde and avoid a

	 * deadlock

	 */

	writel(0x4, hpriv->mmio + AHCI_VENDOR_SPECIFIC_0_ADDR);

	writel(0x80, hpriv->mmio + AHCI_VENDOR_SPECIFIC_0_DATA);

}



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)

		return -ENODEV;



	ahci_mvebu_mbus_config(hpriv, dram);

	ahci_mvebu_regret_option(hpriv);



	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);



/*

 * We currently don't provide power management related operations,

 * since there is no suspend/resume support at the platform level for

 * Armada 38x for the moment.

 */

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@free-electrons.com>, Marcin Wojtas <mw@semihalf.com>");

MODULE_LICENSE("GPL");

MODULE_ALIAS("platform:ahci_mvebu");