misc: pci_endpoint_test: Add support to test PCI EP in AM654x

TI's AM654x PCIe EP has a restriction that BAR_0 is mapped to
application registers. "PCIe Inbound Address Translation" section in
AM65x Sitara Processors TRM (SPRUID7 – April 2018) describes BAR0 as
reserved.

Configure pci_endpoint_test to use BAR_2 instead.

Also set alignment to 64K since "PCIe Subsystem Address Translation"
section in TRM indicates minimum ATU window size is 64K.

Signed-off-by: Kishon Vijay Abraham I <kishon@ti.com>
Signed-off-by: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>

1 files changed, 17 insertions, 0 deletions

diff --git a/drivers/misc/pci_endpoint_test.c b/drivers/misc/pci_endpoint_test.c
index 29582fe57151..e015e8fa9bd3 100644
--- a/drivers/misc/pci_endpoint_test.c
+++ b/drivers/misc/pci_endpoint_test.c
@@ -75,6 +75,11 @@
 #define PCI_ENDPOINT_TEST_IRQ_TYPE              0x24
 #define PCI_ENDPOINT_TEST_IRQ_NUMBER            0x28
 
+#define PCI_DEVICE_ID_TI_AM654                  0xb00c
+
+#define is_am654_pci_dev(pdev)          \
+                ((pdev)->device == PCI_DEVICE_ID_TI_AM654)
+
 static DEFINE_IDA(pci_endpoint_test_ida);
 
 #define to_endpoint_test(priv) container_of((priv), struct pci_endpoint_test, \
@@ -588,6 +593,7 @@ static long pci_endpoint_test_ioctl(struct file *file, unsigned int cmd,
         int ret = -EINVAL;
         enum pci_barno bar;
         struct pci_endpoint_test *test = to_endpoint_test(file->private_data);
+        struct pci_dev *pdev = test->pdev;
 
         mutex_lock(&test->mutex);
         switch (cmd) {
@@ -595,6 +601,8 @@ static long pci_endpoint_test_ioctl(struct file *file, unsigned int cmd,
                 bar = arg;
                 if (bar < 0 || bar > 5)
                         goto ret;
+                if (is_am654_pci_dev(pdev) && bar == BAR_0)
+                        goto ret;
                 ret = pci_endpoint_test_bar(test, bar);
                 break;
         case PCITEST_LEGACY_IRQ:
@@ -785,11 +793,20 @@ static void pci_endpoint_test_remove(struct pci_dev *pdev)
         pci_disable_device(pdev);
 }
 
+static const struct pci_endpoint_test_data am654_data = {
+        .test_reg_bar = BAR_2,
+        .alignment = SZ_64K,
+        .irq_type = IRQ_TYPE_MSI,
+};
+
 static const struct pci_device_id pci_endpoint_test_tbl[] = {
         { PCI_DEVICE(PCI_VENDOR_ID_TI, PCI_DEVICE_ID_TI_DRA74x) },
         { PCI_DEVICE(PCI_VENDOR_ID_TI, PCI_DEVICE_ID_TI_DRA72x) },
         { PCI_DEVICE(PCI_VENDOR_ID_FREESCALE, 0x81c0) },
         { PCI_DEVICE(PCI_VENDOR_ID_SYNOPSYS, 0xedda) },
+        { PCI_DEVICE(PCI_VENDOR_ID_TI, PCI_DEVICE_ID_TI_AM654),
+          .driver_data = (kernel_ulong_t)&am654_data
+        },
         { }
 };
 MODULE_DEVICE_TABLE(pci, pci_endpoint_test_tbl);