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SubjectRe: [RFC PATCH 09/15] ata: ti_sata: Add Texas Instruments SATA Wrapper driver
Date

Hi,

On Thursday, September 19, 2013 04:05:37 PM Roger Quadros wrote:
> Texas Instruments SoCs like OMAP5 and DRA7 contain a SATA wrapper
> around the AHCI SATA core. This driver will manage that.
>
> CC: Tejun Heo <tj@kernel.org>
> Signed-off-by: Roger Quadros <rogerq@ti.com>
> ---
> Documentation/devicetree/bindings/ata/ti-sata.txt | 31 ++++
> drivers/ata/Kconfig | 7 +
> drivers/ata/Makefile | 1 +
> drivers/ata/sata_ti.c | 160 +++++++++++++++++++++
> 4 files changed, 199 insertions(+), 0 deletions(-)
> create mode 100644 Documentation/devicetree/bindings/ata/ti-sata.txt
> create mode 100644 drivers/ata/sata_ti.c
>
> diff --git a/Documentation/devicetree/bindings/ata/ti-sata.txt b/Documentation/devicetree/bindings/ata/ti-sata.txt
> new file mode 100644
> index 0000000..bf0ea3b
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/ata/ti-sata.txt
> @@ -0,0 +1,31 @@
> +* Texas Instruments SATA Controller Wrapper
> +
> +Required properties:
> +- compatible : "ti,sata"
> +- ti,hwmods : "sata"
> +- reg : Register mapping
> +- #address-cells: <1>
> +- #size-cells : <1>
> +- ranges : allows valid translation between child's address space and parent's
> + address space.
> +- Must contain at least one child node for the SATA controller core
> +
> +Example:
> +
> + sata: sata@4a141100 {
> + compatible = "ti,sata";
> + ti,hwmods = "sata";
> + reg = <0x4a141100 0x7>;
> + #address-cells = <1>;
> + #size-cells = <1>;
> + ranges;
> + dwc-ahci@4a140000 {
> + compatible = "snps,dwc-ahci";
> + reg = <0x4a140000 0x1100>;
> + interrupts = <GIC_SPI 54 IRQ_TYPE_LEVEL_HIGH>;
> + phys = <&sata_phy>;
> + phy-names = "sata-phy";
> + clocks = <&sata_ref_clk>;
> + clock-names = "optclk";
> + };
> + };
> diff --git a/drivers/ata/Kconfig b/drivers/ata/Kconfig
> index a53ef27..a3de4d2 100644
> --- a/drivers/ata/Kconfig
> +++ b/drivers/ata/Kconfig
> @@ -138,6 +138,13 @@ config SATA_SIL24
>
> If unsure, say N.
>
> +config SATA_TI
> + tristate "Texas Instruments SATA Wrapper driver"
> + depends on ARCH_OMAP
> + help
> + This options enables SATA Wrapper driver for Texas Instruments SoCs.
> + It is found on OMAP5 and DRA7.
> +
> config ATA_SFF
> bool "ATA SFF support (for legacy IDE and PATA)"
> default y
> diff --git a/drivers/ata/Makefile b/drivers/ata/Makefile
> index 46518c6..673ba5e 100644
> --- a/drivers/ata/Makefile
> +++ b/drivers/ata/Makefile
> @@ -11,6 +11,7 @@ obj-$(CONFIG_SATA_SIL24) += sata_sil24.o
> obj-$(CONFIG_SATA_DWC) += sata_dwc_460ex.o
> obj-$(CONFIG_SATA_HIGHBANK) += sata_highbank.o libahci.o
> obj-$(CONFIG_AHCI_IMX) += ahci_imx.o
> +obj-$(CONFIG_SATA_TI) += sata_ti.o
>
> # SFF w/ custom DMA
> obj-$(CONFIG_PDC_ADMA) += pdc_adma.o
> diff --git a/drivers/ata/sata_ti.c b/drivers/ata/sata_ti.c
> new file mode 100644
> index 0000000..0b9093d
> --- /dev/null
> +++ b/drivers/ata/sata_ti.c
> @@ -0,0 +1,160 @@
> +/**
> + * sata-ti.c - Texas Instruments Specific SATA Glue layer

s/sata-ti/sata_ti/

> + *
> + * Copyright (C) 2013 Texas Instruments Incorporated - http://www.ti.com
> + *
> + * Authors: Roger Quadros <rogerq@ti.com>
> + *
> + * This program is free software: you can redistribute it and/or modify
> + * it under the terms of the GNU General Public License version 2 of
> + * the License 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/module.h>
> +#include <linux/kernel.h>
> +#include <linux/slab.h>
> +#include <linux/platform_device.h>
> +#include <linux/ioport.h>
> +#include <linux/io.h>
> +#include <linux/pm_runtime.h>
> +#include <linux/of.h>
> +#include <linux/of_platform.h>
> +
> +/*
> + * All these registers belong to OMAP's Wrapper around the
> + * DesignWare SATA Core.
> + */
> +
> +#define SATA_SYSCONFIG 0x0000
> +#define SATA_CDRLOCK 0x0004

These defines are not used anywhere.

> +struct ti_sata {
> + struct device *dev;
> + void __iomem *base;
> +};
> +
> +static int ti_sata_probe(struct platform_device *pdev)
> +{
> + struct device_node *np = pdev->dev.of_node;
> + struct device *dev = &pdev->dev;
> + struct ti_sata *sata;
> + struct resource *res;
> + void __iomem *base;
> + int ret;
> +
> + if (!np) {
> + dev_err(dev, "device node not found\n");
> + return -EINVAL;
> + }
> +
> + sata = devm_kzalloc(dev, sizeof(*sata), GFP_KERNEL);
> + if (!sata)
> + return -ENOMEM;
> +
> + platform_set_drvdata(pdev, sata);
> +
> + res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
> + if (!res) {
> + dev_err(dev, "missing memory base resource\n");
> + return -EINVAL;
> + }
> +
> + base = devm_ioremap_resource(dev, res);
> + if (IS_ERR(base))
> + return PTR_ERR(base);
> +
> + sata->dev = dev;
> + sata->base = base;

sata structure is just setup and it is not used later anywhere.

> + pm_runtime_enable(dev);
> + ret = pm_runtime_get_sync(dev);
> + if (ret < 0) {
> + dev_err(dev, "pm_runtime_get_sync failed with err %d\n",
> + ret);
> + goto runtime_disable;
> + }
> +
> + ret = of_platform_populate(np, NULL, NULL, dev);

Shouldn't this driver depend on CONFIG_OF?

> + if (ret) {
> + dev_err(&pdev->dev, "failed to create TI SATA children\n");
> + goto runtime_put;
> + }
> +
> + return 0;
> +
> +runtime_put:
> + pm_runtime_put_sync(dev);
> +
> +runtime_disable:
> + pm_runtime_disable(dev);
> +
> + return ret;
> +}
> +
> +static int ti_sata_remove_child(struct device *dev, void *c)
> +{
> + struct platform_device *pdev = to_platform_device(dev);
> +
> + platform_device_unregister(pdev);
> +
> + return 0;
> +}
> +
> +static int ti_sata_remove(struct platform_device *pdev)
> +{
> + pm_runtime_put_sync(&pdev->dev);
> + pm_runtime_disable(&pdev->dev);
> + device_for_each_child(&pdev->dev, NULL, ti_sata_remove_child);
> +
> + return 0;
> +}
> +
> +static const struct of_device_id of_ti_sata_match[] = {
> + {
> + .compatible = "ti,sata"
> + },
> + { },
> +};
> +MODULE_DEVICE_TABLE(of, of_ti_sata_match);
> +
> +#ifdef CONFIG_PM
> +
> +static int ti_sata_resume(struct device *dev)
> +{
> + pm_runtime_disable(dev);
> + pm_runtime_set_active(dev);
> + pm_runtime_enable(dev);

This doesn't look like a correct ->resume method:
* it shouldn't touch runtime PM at all
* for each ->resume method there should be a corresponding ->suspend method

Moreover this whole wrapper driver seems strange, why not just add a proper
runtime PM support to ahci_platform driver instead?

> +
> + return 0;
> +}
> +
> +static const struct dev_pm_ops ti_sata_dev_pm_ops = {
> + .resume = ti_sata_resume,
> +};
> +
> +#define DEV_PM_OPS (&ti_sata_dev_pm_ops)
> +#else
> +#define DEV_PM_OPS NULL
> +#endif /* CONFIG_PM */
> +
> +static struct platform_driver ti_sata_driver = {
> + .probe = ti_sata_probe,
> + .remove = ti_sata_remove,
> + .driver = {
> + .name = "ti-sata",
> + .of_match_table = of_ti_sata_match,
> + .pm = DEV_PM_OPS,
> + },
> +};
> +
> +module_platform_driver(ti_sata_driver);
> +
> +MODULE_ALIAS("platform:ti-sata");
> +MODULE_AUTHOR("Roger Quadros <rogerq@ti.com>");
> +MODULE_LICENSE("GPL v2");
> +MODULE_DESCRIPTION("TI SATA Glue Layer");

Best regards,
--
Bartlomiej Zolnierkiewicz
Samsung R&D Institute Poland
Samsung Electronics



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