test: dm: pci: Add cases for finding PCI capability APIs

Add several PCI capability and extended capability ID registers
in the swap_case driver, so that we can add test case for
dm_pci_find_capability() and dm_pci_find_ext_capability().

Signed-off-by: Bin Meng <bmeng.cn@gmail.com>
Reviewed-by: Simon Glass <sjg@chromium.org>

arch/sandbox/include/asm/test.h

@@ -16,6 +16,14 @@
 #define SANDBOX_PCI_CLASS_CODE		PCI_CLASS_CODE_COMM
 #define SANDBOX_PCI_CLASS_SUB_CODE	PCI_CLASS_SUB_CODE_COMM_SERIAL
 
+#define PCI_CAP_ID_PM_OFFSET		0x50
+#define PCI_CAP_ID_EXP_OFFSET		0x60
+#define PCI_CAP_ID_MSIX_OFFSET		0x70
+
+#define PCI_EXT_CAP_ID_ERR_OFFSET	0x100
+#define PCI_EXT_CAP_ID_VC_OFFSET	0x200
+#define PCI_EXT_CAP_ID_DSN_OFFSET	0x300
+
 /* Useful for PCI_VDEVICE() macro */
 #define PCI_VENDOR_ID_SANDBOX		SANDBOX_PCI_VENDOR_ID
 #define SWAP_CASE_DRV_DATA		0x55aa

drivers/misc/swap_case.c

@@ -118,6 +118,27 @@ static int sandbox_swap_case_read_config(struct udevice *emul, uint offset,
 		*valuep = result;
 		break;
 	}
+	case PCI_CAPABILITY_LIST:
+		*valuep = PCI_CAP_ID_PM_OFFSET;
+		break;
+	case PCI_CAP_ID_PM_OFFSET:
+		*valuep = (PCI_CAP_ID_EXP_OFFSET << 8) | PCI_CAP_ID_PM;
+		break;
+	case PCI_CAP_ID_EXP_OFFSET:
+		*valuep = (PCI_CAP_ID_MSIX_OFFSET << 8) | PCI_CAP_ID_EXP;
+		break;
+	case PCI_CAP_ID_MSIX_OFFSET:
+		*valuep = PCI_CAP_ID_MSIX;
+		break;
+	case PCI_EXT_CAP_ID_ERR_OFFSET:
+		*valuep = (PCI_EXT_CAP_ID_VC_OFFSET << 20) | PCI_EXT_CAP_ID_ERR;
+		break;
+	case PCI_EXT_CAP_ID_VC_OFFSET:
+		*valuep = (PCI_EXT_CAP_ID_DSN_OFFSET << 20) | PCI_EXT_CAP_ID_VC;
+		break;
+	case PCI_EXT_CAP_ID_DSN_OFFSET:
+		*valuep = PCI_EXT_CAP_ID_DSN;
+		break;
 	}
 
 	return 0;

test/dm/pci.c

@@ -188,3 +188,35 @@ static int dm_test_pci_mixed(struct unit_test_state *uts)
 	return 0;
 }
 DM_TEST(dm_test_pci_mixed, DM_TESTF_SCAN_PDATA | DM_TESTF_SCAN_FDT);
+
+/* Test looking up PCI capability and extended capability */
+static int dm_test_pci_cap(struct unit_test_state *uts)
+{
+	struct udevice *bus, *swap;
+	int cap;
+
+	ut_assertok(uclass_get_device_by_seq(UCLASS_PCI, 0, &bus));
+	ut_assertok(dm_pci_bus_find_bdf(PCI_BDF(0, 0x1f, 0), &swap));
+
+	/* look up PCI_CAP_ID_EXP */
+	cap = dm_pci_find_capability(swap, PCI_CAP_ID_EXP);
+	ut_asserteq(PCI_CAP_ID_EXP_OFFSET, cap);
+
+	/* look up PCI_CAP_ID_PCIX */
+	cap = dm_pci_find_capability(swap, PCI_CAP_ID_PCIX);
+	ut_asserteq(0, cap);
+
+	ut_assertok(uclass_get_device_by_seq(UCLASS_PCI, 1, &bus));
+	ut_assertok(dm_pci_bus_find_bdf(PCI_BDF(1, 0x08, 0), &swap));
+
+	/* look up PCI_EXT_CAP_ID_DSN */
+	cap = dm_pci_find_ext_capability(swap, PCI_EXT_CAP_ID_DSN);
+	ut_asserteq(PCI_EXT_CAP_ID_DSN_OFFSET, cap);
+
+	/* look up PCI_EXT_CAP_ID_SRIOV */
+	cap = dm_pci_find_ext_capability(swap, PCI_EXT_CAP_ID_SRIOV);
+	ut_asserteq(0, cap);
+
+	return 0;
+}
+DM_TEST(dm_test_pci_cap, DM_TESTF_SCAN_PDATA | DM_TESTF_SCAN_FDT);