Commit 5bb04b19 authored by Kishon Vijay Abraham I's avatar Kishon Vijay Abraham I Committed by Lorenzo Pieralisi
Browse files

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: default avatarKishon Vijay Abraham I <kishon@ti.com>
Signed-off-by: default avatarLorenzo Pieralisi <lorenzo.pieralisi@arm.com>
parent 6b733030

drivers/misc/pci_endpoint_test.c

+17 −0
Original line number Diff line number Diff line
@@ -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);

CRA Git | Maintained and supported by SUSTech CRA and CCSE