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 <redacted>
---
 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