[PATCH v11 4/5] drm/etnaviv: Add driver support for the PCI devices

[Sui Jingfeng]

There is a Vivante GC1000 GPU (v5037) in Loongson LS2K1000 (0x0014:0x7a05)
and LS7A1000 (0x0014:0x7a15), the GPU in these chips is a PCI(e) device.
This patch adds PCI driver wrapper for this gpu. This GPU has only one GPU
core, there no need to bind to anything for now. Hence, the component
framework get bypassed.

Signed-off-by: Sui Jingfeng <suijingfeng@xxxxxxxxxxx>
---
 drivers/gpu/drm/etnaviv/Kconfig           |  8 +++
 drivers/gpu/drm/etnaviv/Makefile          |  2 +
 drivers/gpu/drm/etnaviv/etnaviv_drv.c     | 10 ++-
 drivers/gpu/drm/etnaviv/etnaviv_drv.h     |  3 +
 drivers/gpu/drm/etnaviv/etnaviv_pci_drv.c | 74 +++++++++++++++++++++++
 drivers/gpu/drm/etnaviv/etnaviv_pci_drv.h | 18 ++++++
 6 files changed, 113 insertions(+), 2 deletions(-)
 create mode 100644 drivers/gpu/drm/etnaviv/etnaviv_pci_drv.c
 create mode 100644 drivers/gpu/drm/etnaviv/etnaviv_pci_drv.h

diff --git a/drivers/gpu/drm/etnaviv/Kconfig b/drivers/gpu/drm/etnaviv/Kconfig
index faa7fc68b009..38c251585ec1 100644
--- a/drivers/gpu/drm/etnaviv/Kconfig
+++ b/drivers/gpu/drm/etnaviv/Kconfig
@@ -15,6 +15,14 @@ config DRM_ETNAVIV
 	help
 	  DRM driver for Vivante GPUs.
 
+config DRM_ETNAVIV_PCI_DRIVER
+	bool "enable ETNAVIV PCI driver support"
+	depends on DRM_ETNAVIV
+	depends on PCI
+	help
+	  Compile in support for Vivante GPUs attached via PCI(e).
+	  Say Y if you have such hardwares.
+
 config DRM_ETNAVIV_THERMAL
 	bool "enable ETNAVIV thermal throttling"
 	depends on DRM_ETNAVIV
diff --git a/drivers/gpu/drm/etnaviv/Makefile b/drivers/gpu/drm/etnaviv/Makefile
index 46e5ffad69a6..6829e1ebf2db 100644
--- a/drivers/gpu/drm/etnaviv/Makefile
+++ b/drivers/gpu/drm/etnaviv/Makefile
@@ -16,4 +16,6 @@ etnaviv-y := \
 	etnaviv_perfmon.o \
 	etnaviv_sched.o
 
+etnaviv-$(CONFIG_DRM_ETNAVIV_PCI_DRIVER) += etnaviv_pci_drv.o
+
 obj-$(CONFIG_DRM_ETNAVIV)	+= etnaviv.o
diff --git a/drivers/gpu/drm/etnaviv/etnaviv_drv.c b/drivers/gpu/drm/etnaviv/etnaviv_drv.c
index 0b68c76d117e..8db86120b11d 100644
--- a/drivers/gpu/drm/etnaviv/etnaviv_drv.c
+++ b/drivers/gpu/drm/etnaviv/etnaviv_drv.c
@@ -23,6 +23,7 @@
 #include "etnaviv_gpu.h"
 #include "etnaviv_gem.h"
 #include "etnaviv_mmu.h"
+#include "etnaviv_pci_drv.h"
 #include "etnaviv_perfmon.h"
 
 static struct etnaviv_drm_private *etna_drm_priv_ptr;
@@ -547,7 +548,7 @@ static const struct drm_driver etnaviv_drm_driver = {
 	.minor              = 3,
 };
 
-static int etnaviv_drm_bind(struct device *dev, bool component)
+int etnaviv_drm_bind(struct device *dev, bool component)
 {
 	struct etnaviv_drm_private *priv;
 	struct drm_device *drm;
@@ -598,7 +599,7 @@ static int etnaviv_drm_bind(struct device *dev, bool component)
 	return ret;
 }
 
-static void etnaviv_drm_unbind(struct device *dev, bool component)
+void etnaviv_drm_unbind(struct device *dev, bool component)
 {
 	struct etnaviv_drm_private *priv = etna_drm_priv_ptr;
 	struct drm_device *drm = priv->drm;
@@ -758,6 +759,10 @@ static int __init etnaviv_init(void)
 	if (ret != 0)
 		goto unregister_gpu_driver;
 
+	ret = etnaviv_register_pci_driver();
+	if (ret != 0)
+		goto unregister_platform_driver;
+
 	/*
 	 * If the DT contains at least one available GPU device, instantiate
 	 * the DRM platform device.
@@ -786,6 +791,7 @@ static void __exit etnaviv_exit(void)
 	etnaviv_destroy_platform_device(&etnaviv_drm);
 	platform_driver_unregister(&etnaviv_platform_driver);
 	platform_driver_unregister(&etnaviv_gpu_driver);
+	etnaviv_unregister_pci_driver();
 }
 module_exit(etnaviv_exit);
 
diff --git a/drivers/gpu/drm/etnaviv/etnaviv_drv.h b/drivers/gpu/drm/etnaviv/etnaviv_drv.h
index e58f82e698de..9cd72948cfad 100644
--- a/drivers/gpu/drm/etnaviv/etnaviv_drv.h
+++ b/drivers/gpu/drm/etnaviv/etnaviv_drv.h
@@ -83,6 +83,9 @@ bool etnaviv_cmd_validate_one(struct etnaviv_gpu *gpu,
 	u32 *stream, unsigned int size,
 	struct drm_etnaviv_gem_submit_reloc *relocs, unsigned int reloc_size);
 
+int etnaviv_drm_bind(struct device *dev, bool component);
+void etnaviv_drm_unbind(struct device *dev, bool component);
+
 #ifdef CONFIG_DEBUG_FS
 void etnaviv_gem_describe_objects(struct etnaviv_drm_private *priv,
 	struct seq_file *m);
diff --git a/drivers/gpu/drm/etnaviv/etnaviv_pci_drv.c b/drivers/gpu/drm/etnaviv/etnaviv_pci_drv.c
new file mode 100644
index 000000000000..37de661844d8
--- /dev/null
+++ b/drivers/gpu/drm/etnaviv/etnaviv_pci_drv.c
@@ -0,0 +1,74 @@
+// SPDX-License-Identifier: GPL-2.0
+
+#include <linux/pci.h>
+
+#include "etnaviv_drv.h"
+#include "etnaviv_gpu.h"
+#include "etnaviv_pci_drv.h"
+
+static int etnaviv_pci_probe(struct pci_dev *pdev,
+			     const struct pci_device_id *ent)
+{
+	struct device *dev = &pdev->dev;
+	void __iomem *mmio;
+	int ret;
+
+	ret = pcim_enable_device(pdev);
+	if (ret) {
+		dev_err(dev, "failed to enable\n");
+		return ret;
+	}
+
+	pci_set_master(pdev);
+
+	ret = dma_set_mask_and_coherent(dev, DMA_BIT_MASK(32));
+	if (ret)
+		return ret;
+
+	/* PCI bar 0 contain the MMIO registers */
+	mmio = pcim_iomap(pdev, 0, 0);
+	if (IS_ERR(mmio))
+		return PTR_ERR(mmio);
+
+	ret = etnaviv_gpu_driver_create(dev, mmio, pdev->irq, false, false);
+	if (ret)
+		return ret;
+
+	return etnaviv_drm_bind(dev, false);
+}
+
+static void etnaviv_pci_remove(struct pci_dev *pdev)
+{
+	struct device *dev = &pdev->dev;
+
+	etnaviv_drm_unbind(dev, false);
+
+	etnaviv_gpu_driver_destroy(dev, false);
+
+	pci_clear_master(pdev);
+}
+
+static const struct pci_device_id etnaviv_pci_id_lists[] = {
+	{PCI_VDEVICE(LOONGSON, 0x7a15)},
+	{PCI_VDEVICE(LOONGSON, 0x7a05)},
+	{ }
+};
+
+static struct pci_driver etnaviv_pci_driver = {
+	.name = "etnaviv",
+	.id_table = etnaviv_pci_id_lists,
+	.probe = etnaviv_pci_probe,
+	.remove = etnaviv_pci_remove,
+};
+
+int etnaviv_register_pci_driver(void)
+{
+	return pci_register_driver(&etnaviv_pci_driver);
+}
+
+void etnaviv_unregister_pci_driver(void)
+{
+	pci_unregister_driver(&etnaviv_pci_driver);
+}
+
+MODULE_DEVICE_TABLE(pci, etnaviv_pci_id_lists);
diff --git a/drivers/gpu/drm/etnaviv/etnaviv_pci_drv.h b/drivers/gpu/drm/etnaviv/etnaviv_pci_drv.h
new file mode 100644
index 000000000000..1db559ee5e9b
--- /dev/null
+++ b/drivers/gpu/drm/etnaviv/etnaviv_pci_drv.h
@@ -0,0 +1,18 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+
+#ifndef __ETNAVIV_PCI_DRV_H__
+#define __ETNAVIV_PCI_DRV_H__
+
+#ifdef CONFIG_DRM_ETNAVIV_PCI_DRIVER
+
+int etnaviv_register_pci_driver(void);
+void etnaviv_unregister_pci_driver(void);
+
+#else
+
+static inline int etnaviv_register_pci_driver(void) { return 0; }
+static inline void etnaviv_unregister_pci_driver(void) { }
+
+#endif
+
+#endif
-- 
2.34.1