linux-kernel - [RFC PATCH 3/5] misc: pci_endpoint_test: Add driver data for Renesas RZ/G2{EHMN}

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Date:   Wed, 26 Jan 2022 19:50:41 +0000
From:   Lad Prabhakar <prabhakar.mahadev-lad.rj@...renesas.com>
To:     Kishon Vijay Abraham I <kishon@...com>,
        Bjorn Helgaas <bhelgaas@...gle.com>,
        Lorenzo Pieralisi <lorenzo.pieralisi@....com>,
        Krzysztof Wilczyński <kw@...ux.com>,
        Arnd Bergmann <arnd@...db.de>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Marek Vasut <marek.vasut+renesas@...il.com>,
        Yoshihiro Shimoda <yoshihiro.shimoda.uh@...esas.com>,
        Rob Herring <robh@...nel.org>, linux-pci@...r.kernel.org,
        linux-renesas-soc@...r.kernel.org
Cc:     linux-kernel@...r.kernel.org,
        Prabhakar <prabhakar.csengg@...il.com>,
        Biju Das <biju.das.jz@...renesas.com>,
        Lad Prabhakar <prabhakar.mahadev-lad.rj@...renesas.com>
Subject: [RFC PATCH 3/5] misc: pci_endpoint_test: Add driver data for Renesas RZ/G2{EHMN}

Add "dmac_data_alignment" member (indicating the alignment requirement
for internal DMAC for data transfers) to struct pci_endpoint_test_data
and add driver_data to Renesas RZ/G2{EHMN}.

Signed-off-by: Lad Prabhakar <prabhakar.mahadev-lad.rj@...renesas.com>
---
 drivers/misc/pci_endpoint_test.c | 40 ++++++++++++++++++++++++++------
 1 file changed, 33 insertions(+), 7 deletions(-)

diff --git a/drivers/misc/pci_endpoint_test.c b/drivers/misc/pci_endpoint_test.c
index 8f786a225dcf..0a00d45830e9 100644
--- a/drivers/misc/pci_endpoint_test.c
+++ b/drivers/misc/pci_endpoint_test.c
@@ -116,6 +116,7 @@ struct pci_endpoint_test {
 	struct miscdevice miscdev;
 	enum pci_barno test_reg_bar;
 	size_t alignment;
+	size_t dmac_data_alignment;
 	const char *name;
 };
 
@@ -123,6 +124,7 @@ struct pci_endpoint_test_data {
 	enum pci_barno test_reg_bar;
 	size_t alignment;
 	int irq_type;
+	size_t dmac_data_alignment;
 };
 
 static inline u32 pci_endpoint_test_readl(struct pci_endpoint_test *test,
@@ -368,8 +370,11 @@ static bool pci_endpoint_test_copy(struct pci_endpoint_test *test,
 		goto err;
 
 	use_dma = !!(param.flags & PCITEST_FLAGS_USE_DMA);
-	if (use_dma)
+	if (use_dma) {
 		flags |= FLAG_USE_DMA;
+		if (test->dmac_data_alignment)
+			size =  ALIGN(size, test->dmac_data_alignment);
+	}
 
 	if (irq_type < IRQ_TYPE_LEGACY || irq_type > IRQ_TYPE_MSIX) {
 		dev_err(dev, "Invalid IRQ type option\n");
@@ -502,8 +507,11 @@ static bool pci_endpoint_test_write(struct pci_endpoint_test *test,
 		goto err;
 
 	use_dma = !!(param.flags & PCITEST_FLAGS_USE_DMA);
-	if (use_dma)
+	if (use_dma) {
 		flags |= FLAG_USE_DMA;
+		if (test->dmac_data_alignment)
+			size =  ALIGN(size, test->dmac_data_alignment);
+	}
 
 	if (irq_type < IRQ_TYPE_LEGACY || irq_type > IRQ_TYPE_MSIX) {
 		dev_err(dev, "Invalid IRQ type option\n");
@@ -600,8 +608,11 @@ static bool pci_endpoint_test_read(struct pci_endpoint_test *test,
 		goto err;
 
 	use_dma = !!(param.flags & PCITEST_FLAGS_USE_DMA);
-	if (use_dma)
+	if (use_dma) {
 		flags |= FLAG_USE_DMA;
+		if (test->dmac_data_alignment)
+			size =  ALIGN(size, test->dmac_data_alignment);
+	}
 
 	if (irq_type < IRQ_TYPE_LEGACY || irq_type > IRQ_TYPE_MSIX) {
 		dev_err(dev, "Invalid IRQ type option\n");
@@ -787,6 +798,7 @@ static int pci_endpoint_test_probe(struct pci_dev *pdev,
 		test->test_reg_bar = test_reg_bar;
 		test->alignment = data->alignment;
 		irq_type = data->irq_type;
+		test->dmac_data_alignment = data->dmac_data_alignment;
 	}
 
 	init_completion(&test->irq_raised);
@@ -948,6 +960,12 @@ static const struct pci_endpoint_test_data j721e_data = {
 	.irq_type = IRQ_TYPE_MSI,
 };
 
+static const struct pci_endpoint_test_data renesas_rzg2x_data = {
+	.test_reg_bar = BAR_0,
+	.irq_type = IRQ_TYPE_MSI,
+	.dmac_data_alignment = 8,
+};
+
 static const struct pci_device_id pci_endpoint_test_tbl[] = {
 	{ PCI_DEVICE(PCI_VENDOR_ID_TI, PCI_DEVICE_ID_TI_DRA74x),
 	  .driver_data = (kernel_ulong_t)&default_data,
@@ -965,10 +983,18 @@ static const struct pci_device_id pci_endpoint_test_tbl[] = {
 	{ PCI_DEVICE(PCI_VENDOR_ID_TI, PCI_DEVICE_ID_TI_AM654),
 	  .driver_data = (kernel_ulong_t)&am654_data
 	},
-	{ PCI_DEVICE(PCI_VENDOR_ID_RENESAS, PCI_DEVICE_ID_RENESAS_R8A774A1),},
-	{ PCI_DEVICE(PCI_VENDOR_ID_RENESAS, PCI_DEVICE_ID_RENESAS_R8A774B1),},
-	{ PCI_DEVICE(PCI_VENDOR_ID_RENESAS, PCI_DEVICE_ID_RENESAS_R8A774C0),},
-	{ PCI_DEVICE(PCI_VENDOR_ID_RENESAS, PCI_DEVICE_ID_RENESAS_R8A774E1),},
+	{ PCI_DEVICE(PCI_VENDOR_ID_RENESAS, PCI_DEVICE_ID_RENESAS_R8A774A1),
+	 .driver_data = (kernel_ulong_t)&renesas_rzg2x_data,
+	},
+	{ PCI_DEVICE(PCI_VENDOR_ID_RENESAS, PCI_DEVICE_ID_RENESAS_R8A774B1),
+	 .driver_data = (kernel_ulong_t)&renesas_rzg2x_data,
+	},
+	{ PCI_DEVICE(PCI_VENDOR_ID_RENESAS, PCI_DEVICE_ID_RENESAS_R8A774C0),
+	 .driver_data = (kernel_ulong_t)&renesas_rzg2x_data,
+	},
+	{ PCI_DEVICE(PCI_VENDOR_ID_RENESAS, PCI_DEVICE_ID_RENESAS_R8A774E1),
+	 .driver_data = (kernel_ulong_t)&renesas_rzg2x_data,
+	},
 	{ PCI_DEVICE(PCI_VENDOR_ID_TI, PCI_DEVICE_ID_TI_J721E),
 	  .driver_data = (kernel_ulong_t)&j721e_data,
 	},
-- 
2.25.1