[PATCH v5 2/3] libahci: Add support to handle HOST_IRQ_STAT as edge trigger latch.

[PATCH v5 2/3] libahci: Add support to handle HOST_IRQ_STAT as edge trigger latch.

[Suman Tripathi]

Hi Tejun

On Wed, May 6, 2015 at 12:51 AM, Suman Tripathi <stripathi@apm.com> wrote:
>
> This patch adds the support to handle HOST_IRQ_STAT as edge trigger
> latch.
>
> Signed-off-by: Suman Tripathi <stripathi@apm.com>
> ---
>  drivers/ata/ahci.h    |  2 ++
>  drivers/ata/libahci.c | 40 ++++++++++++++++++++++++++++++++++++++++
>  2 files changed, 42 insertions(+)
>
> diff --git a/drivers/ata/ahci.h b/drivers/ata/ahci.h
> index 71262e0..f442960 100644
> --- a/drivers/ata/ahci.h
> +++ b/drivers/ata/ahci.h
> @@ -238,6 +238,8 @@ enum {
>         AHCI_HFLAG_MULTI_MSI            = (1 << 16), /* multiple PCI MSIs */
>         AHCI_HFLAG_NO_DEVSLP            = (1 << 17), /* no device sleep */
>         AHCI_HFLAG_NO_FBS               = (1 << 18), /* no FBS */
> +       AHCI_HFLAG_EDGE_IRQ             = (1 << 19), /* HOST_IRQ_STAT behaves as
> +                                                       Edge Triggered */
>
>         /* ap->flags bits */
>
> diff --git a/drivers/ata/libahci.c b/drivers/ata/libahci.c
> index aa89c8e..1add5ba 100644
> --- a/drivers/ata/libahci.c
> +++ b/drivers/ata/libahci.c
> @@ -1853,6 +1853,43 @@ static u32 ahci_handle_port_intr(struct ata_host *host, u32 irq_masked)
>         return handled;
>  }
>
> +static irqreturn_t ahci_single_edge_irq_intr(int irq, void *dev_instance)
> +{
> +       struct ata_host *host = dev_instance;
> +       struct ahci_host_priv *hpriv;
> +       unsigned int rc = 0;
> +       void __iomem *mmio;
> +       u32 irq_stat, irq_masked;
> +
> +       VPRINTK("ENTER\n");
> +
> +       hpriv = host->private_data;
> +       mmio = hpriv->mmio;
> +
> +       /* sigh.  0xffffffff is a valid return from h/w */
> +       irq_stat = readl(mmio + HOST_IRQ_STAT);
> +       if (!irq_stat)
> +               return IRQ_NONE;
> +
> +       irq_masked = irq_stat & hpriv->port_map;
> +
> +       spin_lock(&host->lock);
> +
> +       /*
> +        * HOST_IRQ_STAT behaves as edge triggered latch meaning that
> +        * it should be cleared before all the port events are cleared.
> +        */
> +       writel(irq_stat, mmio + HOST_IRQ_STAT);
> +
> +       rc = ahci_handle_port_intr(host, irq_masked);
> +
> +       spin_unlock(&host->lock);
> +
> +       VPRINTK("EXIT\n");
> +
> +       return IRQ_RETVAL(rc);
> +}
> +
>  static irqreturn_t ahci_single_level_irq_intr(int irq, void *dev_instance)
>  {
>         struct ata_host *host = dev_instance;
> @@ -2495,6 +2532,9 @@ int ahci_host_activate(struct ata_host *host, int irq,
>
>         if (hpriv->flags & AHCI_HFLAG_MULTI_MSI)
>                 rc = ahci_host_activate_multi_irqs(host, irq, sht);
> +       else if (hpriv->flags & AHCI_HFLAG_EDGE_IRQ)
> +               rc = ata_host_activate(host, irq, ahci_single_edge_irq_intr,
> +                                      IRQF_SHARED, sht);
>         else
>                 rc = ata_host_activate(host, irq, ahci_single_level_irq_intr,
>                                        IRQF_SHARED, sht);
> --
> 1.8.2.1
>

Any comments on this version ??

-- 
Thanks,
with regards,
Suman Tripathi

[PATCH v5 3/3] ata: ahci_xgene: Add AHCI Support for 2nd HW version of APM X-Gene SoC AHCI SATA Host controller.

[Suman Tripathi]

On Wed, May 6, 2015 at 12:51 AM, Suman Tripathi <stripathi@apm.com> wrote:
> This patch enables full AHCI feature support for APM X-Gene SoC SATA
> host controller. The following errata's are removed:
>
> 1. 2a0bdff6b95 ("ahci-xgene: fix the dma state machine lockup for the
>                  IDENTIFY DEVICE PIO mode command")
> 2. 09c32aaa368 ("ahci_xgene: Fix the dma state machine lockup for the
>                  ATA_CMD_SMART PIO mode command")
> 3. 1540035da71 ("ahci_xgene: Implement the xgene_ahci_poll_reg_val to
>                  support PMP")
> 4. a3a84bc7c88 ("ahci_xgene: Implement the workaround to support PMP
>                  enumeration and discovery")
> 5. 1102407bb71 ("ahci_xgene: Fix the DMA state machine lockup for the
>                  ATA_CMD_PACKET PIO mode command")
> 6. 72f79f9e35b ("ahci_xgene: Removing NCQ support from the APM X-Gene
>                 SoC AHCI SATA Host Controller driver")
>
> In addition, enable PMP support for APM X-Gene SoC and enable FBS
> support for second generation APM X-Gene SoC.
>
> Signed-off-by: Suman Tripathi <stripathi@apm.com>
> ---
>  drivers/ata/ahci_xgene.c | 90 ++++++++++++++++++++++++++++++++++++++----------
>  1 file changed, 72 insertions(+), 18 deletions(-)
>
> diff --git a/drivers/ata/ahci_xgene.c b/drivers/ata/ahci_xgene.c
> index 2b78510..88a0988 100644
> --- a/drivers/ata/ahci_xgene.c
> +++ b/drivers/ata/ahci_xgene.c
> @@ -27,6 +27,7 @@
>  #include <linux/platform_device.h>
>  #include <linux/ahci_platform.h>
>  #include <linux/of_address.h>
> +#include <linux/of_device.h>
>  #include <linux/of_irq.h>
>  #include <linux/phy/phy.h>
>  #include "ahci.h"
> @@ -84,6 +85,11 @@
>  /* Max retry for link down */
>  #define MAX_LINK_DOWN_RETRY 3
>
> +enum xgene_ahci_version {
> +       XGENE_AHCI_V1 = 1,
> +       XGENE_AHCI_V2,
> +};
> +
>  struct xgene_ahci_context {
>         struct ahci_host_priv *hpriv;
>         struct device *dev;
> @@ -547,9 +553,6 @@ static struct ata_port_operations xgene_ahci_ops = {
>         .host_stop = xgene_ahci_host_stop,
>         .hardreset = xgene_ahci_hardreset,
>         .read_id = xgene_ahci_read_id,
> -       .qc_issue = xgene_ahci_qc_issue,
> -       .softreset = xgene_ahci_softreset,
> -       .pmp_softreset = xgene_ahci_pmp_softreset
>  };
>
>  static const struct ata_port_info xgene_ahci_port_info = {
> @@ -629,12 +632,30 @@ static struct scsi_host_template ahci_platform_sht = {
>         AHCI_SHT(DRV_NAME),
>  };
>
> +#ifdef CONFIG_ACPI
> +static const struct acpi_device_id xgene_ahci_acpi_match[] = {
> +       { "APMC0D0D", XGENE_AHCI_V1},
> +       { "APMC0D32", XGENE_AHCI_V2},
> +       {},
> +};
> +MODULE_DEVICE_TABLE(acpi, xgene_ahci_acpi_match);
> +#endif
> +
> +static const struct of_device_id xgene_ahci_of_match[] = {
> +       {.compatible = "apm,xgene-ahci", .data = (void *) XGENE_AHCI_V1},
> +       {.compatible = "apm,xgene-ahci-v2", .data = (void *) XGENE_AHCI_V2},
> +       {},
> +};
> +MODULE_DEVICE_TABLE(of, xgene_ahci_of_match);
> +
>  static int xgene_ahci_probe(struct platform_device *pdev)
>  {
>         struct device *dev = &pdev->dev;
>         struct ahci_host_priv *hpriv;
>         struct xgene_ahci_context *ctx;
>         struct resource *res;
> +       const struct of_device_id *of_devid;
> +       enum xgene_ahci_version version = XGENE_AHCI_V1;
>         int rc;
>
>         hpriv = ahci_platform_get_resources(pdev);
> @@ -677,6 +698,37 @@ static int xgene_ahci_probe(struct platform_device *pdev)
>                 ctx->csr_mux = csr;
>         }
>
> +       of_devid = of_match_device(xgene_ahci_of_match, dev);
> +       if (of_devid) {
> +               if (of_devid->data)
> +                       version = (enum xgene_ahci_version) of_devid->data;
> +       }
> +#ifdef CONFIG_ACPI
> +       else {
> +               const struct acpi_device_id *acpi_id;
> +               struct acpi_device_info *info;
> +               acpi_status status;
> +
> +               acpi_id = acpi_match_device(xgene_ahci_acpi_match, &pdev->dev);
> +               if (!acpi_id) {
> +                       dev_warn(&pdev->dev, "No node entry in ACPI table. Assume version1\n");
> +                       version = XGENE_AHCI_V1;
> +               }
> +
> +               if (acpi_id->driver_data) {
> +                       version = (enum xgene_ahci_version) acpi_id->driver_data;
> +                       status = acpi_get_object_info(ACPI_HANDLE(&pdev->dev), &info);
> +                       if (ACPI_FAILURE(status)) {
> +                               dev_warn(&pdev->dev, "%s: Error reading device info. Assume version1\n",
> +                                       __func__);
> +                               version = XGENE_AHCI_V1;
> +                       }
> +                       if (info->valid & ACPI_VALID_CID)
> +                               version = XGENE_AHCI_V2;
> +               }
> +       }
> +#endif
> +
>         dev_dbg(dev, "VAddr 0x%p Mmio VAddr 0x%p\n", ctx->csr_core,
>                 hpriv->mmio);
>
> @@ -704,7 +756,23 @@ static int xgene_ahci_probe(struct platform_device *pdev)
>         /* Configure the host controller */
>         xgene_ahci_hw_init(hpriv);
>  skip_clk_phy:
> -       hpriv->flags = AHCI_HFLAG_NO_PMP | AHCI_HFLAG_NO_NCQ;
> +
> +       switch (version) {
> +       case XGENE_AHCI_V1:
> +               hpriv->flags = AHCI_HFLAG_NO_NCQ;
> +               /*
> +                * Override the callbacks for storm ERRATA
> +                */
> +               xgene_ahci_ops.qc_issue = xgene_ahci_qc_issue;
> +               xgene_ahci_ops.softreset = xgene_ahci_softreset;
> +               xgene_ahci_ops.pmp_softreset = xgene_ahci_pmp_softreset;
> +               break;
> +       case XGENE_AHCI_V2:
> +               hpriv->flags |= AHCI_HFLAG_YES_FBS | AHCI_HFLAG_EDGE_IRQ;
> +               break;
> +       default:
> +               break;
> +       }
>
>         rc = ahci_platform_init_host(pdev, hpriv, &xgene_ahci_port_info,
>                                      &ahci_platform_sht);
> @@ -719,20 +787,6 @@ disable_resources:
>         return rc;
>  }
>
> -#ifdef CONFIG_ACPI
> -static const struct acpi_device_id xgene_ahci_acpi_match[] = {
> -       { "APMC0D0D", },
> -       { }
> -};
> -MODULE_DEVICE_TABLE(acpi, xgene_ahci_acpi_match);
> -#endif
> -
> -static const struct of_device_id xgene_ahci_of_match[] = {
> -       {.compatible = "apm,xgene-ahci"},
> -       {},
> -};
> -MODULE_DEVICE_TABLE(of, xgene_ahci_of_match);
> -
>  static struct platform_driver xgene_ahci_driver = {
>         .probe = xgene_ahci_probe,
>         .remove = ata_platform_remove_one,
> --
> 1.8.2.1
>

Any comments on this version ??


-- 
Thanks,
with regards,
Suman Tripathi

[PATCH v5 2/3] libahci: Add support to handle HOST_IRQ_STAT as edge trigger latch.

[Tejun Heo]

On Wed, May 06, 2015 at 12:51:11AM +0530, Suman Tripathi wrote:
> This patch adds the support to handle HOST_IRQ_STAT as edge trigger
> latch.
> 
> Signed-off-by: Suman Tripathi <stripathi@apm.com>

Applied 1-2 to libata/for-4.2.

Thanks.

-- 
tejun

[PATCH v5 3/3] ata: ahci_xgene: Add AHCI Support for 2nd HW version of APM X-Gene SoC AHCI SATA Host controller.

[Tejun Heo]

Hello,

On Wed, May 06, 2015 at 12:51:12AM +0530, Suman Tripathi wrote:
> +	switch (version) {
> +	case XGENE_AHCI_V1:
> +		hpriv->flags = AHCI_HFLAG_NO_NCQ;
> +		/*
> +		 * Override the callbacks for storm ERRATA
> +		 */
> +		xgene_ahci_ops.qc_issue = xgene_ahci_qc_issue;
> +		xgene_ahci_ops.softreset = xgene_ahci_softreset;
> +		xgene_ahci_ops.pmp_softreset = xgene_ahci_pmp_softreset;

Let's please create separate ops structs for v1 and v2.

Thanks.

-- 
tejun

[PATCH v5 3/3] ata: ahci_xgene: Add AHCI Support for 2nd HW version of APM X-Gene SoC AHCI SATA Host controller.

[Suman Tripathi]

On Sun, May 10, 2015 at 9:24 PM, Tejun Heo <tj@kernel.org> wrote:
> Hello,
>
> On Wed, May 06, 2015 at 12:51:12AM +0530, Suman Tripathi wrote:
>> +     switch (version) {
>> +     case XGENE_AHCI_V1:
>> +             hpriv->flags = AHCI_HFLAG_NO_NCQ;
>> +             /*
>> +              * Override the callbacks for storm ERRATA
>> +              */
>> +             xgene_ahci_ops.qc_issue = xgene_ahci_qc_issue;
>> +             xgene_ahci_ops.softreset = xgene_ahci_softreset;
>> +             xgene_ahci_ops.pmp_softreset = xgene_ahci_pmp_softreset;
>
> Let's please create separate ops structs for v1 and v2.

Good idea . Will do that .

>
> Thanks.
>
> --
> tejun



-- 
Thanks,
with regards,
Suman Tripathi