[PATCH v3 2/3] ata: Add Qualcomm ARM SoC AHCI SATA host controller driver

[kiran padwal]

tested-by: Kiran Padwal <kiran.padwal at smartplayin.com>
This driver tested with APQ806x SATA PHY Driver.

On Wed, Jun 18, 2014 at 12:06 AM, Kumar Gala <galak at codeaurora.org> wrote:
> Add support for the Qualcomm AHCI SATA controller that exists on several
> SoC and specifically the IPQ806x family of chips.  The IPQ806x SATA support
> requires the associated IPQ806x SATA PHY Driver to be enabled as well.
>
> Signed-off-by: Kumar Gala <galak at codeaurora.org>
> ---
> v3:
> * Added comment about suspend/resume not supported
> * Fixup ahci_platform_init_host for upstream change to interface
> * cleanup error handling of rxoob clk, moved to devm_clk_get/put
>
> v2:
> * Fixed MODULE_LICENSE to be GPL v2
>
>  drivers/ata/Kconfig     | 10 ++++++
>  drivers/ata/Makefile    |  1 +
>  drivers/ata/ahci_qcom.c | 90 +++++++++++++++++++++++++++++++++++++++++++++++++
>  3 files changed, 101 insertions(+)
>  create mode 100644 drivers/ata/ahci_qcom.c
>
> diff --git a/drivers/ata/Kconfig b/drivers/ata/Kconfig
> index 7671dba..aa88648 100644
> --- a/drivers/ata/Kconfig
> +++ b/drivers/ata/Kconfig
> @@ -132,6 +132,16 @@ config AHCI_MVEBU
>
>           If unsure, say N.
>
> +config AHCI_QCOM
> +       tristate "Qualcomm AHCI SATA support"
> +       depends on ARCH_QCOM
> +       help
> +         This option enables support for AHCI SATA controller
> +         integrated into Qualcomm ARM SoC chipsets. For more
> +         information please refer to http://www.qualcomm.com/chipsets.
> +
> +         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 5a02aee..15401e9 100644
> --- a/drivers/ata/Makefile
> +++ b/drivers/ata/Makefile
> @@ -13,6 +13,7 @@ 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-$(CONFIG_AHCI_QCOM)                += ahci_qcom.o libahci.o libahci_platform.o
>  obj-$(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_qcom.c b/drivers/ata/ahci_qcom.c
> new file mode 100644
> index 0000000..412e878
> --- /dev/null
> +++ b/drivers/ata/ahci_qcom.c
> @@ -0,0 +1,90 @@
> +/*
> + * Qualcomm ARM SoC AHCI SATA platform driver
> + *
> + * based on the AHCI SATA platform driver by Jeff Garzik and Anton Vorontsov
> + *
> + * Copyright (c) 2014, The Linux Foundation. All rights reserved.
> + *
> + * This program is free software; you can redistribute it and/or modify
> + * it under the terms of the GNU General Public License version 2 and
> + * only 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.
> + */
> +
> +#include <linux/kernel.h>
> +#include <linux/module.h>
> +#include <linux/pm.h>
> +#include <linux/device.h>
> +#include <linux/platform_device.h>
> +#include <linux/libata.h>
> +#include <linux/ahci_platform.h>
> +#include "ahci.h"
> +
> +static const struct ata_port_info qcom_ahci_port_info = {
> +       .flags          = AHCI_FLAG_COMMON,
> +       .pio_mask       = ATA_PIO4,
> +       .udma_mask      = ATA_UDMA6,
> +       .port_ops       = &ahci_platform_ops,
> +};
> +
> +static int qcom_ahci_probe(struct platform_device *pdev)
> +{
> +       struct ahci_host_priv *hpriv;
> +       struct clk *rxoob_clk;
> +       int rc;
> +
> +       hpriv = ahci_platform_get_resources(pdev);
> +       if (IS_ERR(hpriv))
> +               return PTR_ERR(hpriv);
> +
> +       /* Try and set the rxoob clk to 100Mhz */
> +       rxoob_clk = devm_clk_get(&pdev->dev, "rxoob");
> +       if (IS_ERR(rxoob_clk))
> +               return PTR_ERR(rxoob_clk);
> +
> +       rc = clk_set_rate(rxoob_clk, 100000000);
> +       if (rc)
> +               return rc;
> +
> +       devm_clk_put(&pdev->dev, rxoob_clk);
> +
> +       rc = ahci_platform_enable_resources(hpriv);
> +       if (rc)
> +               return rc;
> +
> +       rc = ahci_platform_init_host(pdev, hpriv, &qcom_ahci_port_info,
> +                                    0, 0, 0);
> +       if (rc)
> +               goto disable_resources;
> +
> +       return 0;
> +disable_resources:
> +       ahci_platform_disable_resources(hpriv);
> +       return rc;
> +}
> +
> +static const struct of_device_id qcom_ahci_of_match[] = {
> +       { .compatible = "qcom,msm-ahci", },
> +       {},
> +};
> +MODULE_DEVICE_TABLE(of, qcom_ahci_of_match);
> +
> +static struct platform_driver qcom_ahci_driver = {
> +       .probe = qcom_ahci_probe,
> +       .remove = ata_platform_remove_one,
> +       .driver = {
> +               .name = "qcom_ahci_qcom",
> +               .owner = THIS_MODULE,
> +               .of_match_table = qcom_ahci_of_match,
> +       },
> +       /* suspend/resume not currently supported */
> +};
> +module_platform_driver(qcom_ahci_driver);
> +
> +MODULE_DESCRIPTION("Qualcomm AHCI SATA platform driver");
> +MODULE_LICENSE("GPL v2");
> +MODULE_ALIAS("ahci:qcom");
> --
> The Qualcomm Innovation Center, Inc. is a member of the Code Aurora Forum,
> hosted by The Linux Foundation
>
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