1 files changed, 379 insertions, 0 deletions
diff --git a/drivers/gpu/drm/nouveau/nvkm/engine/device/tegra.c b/drivers/gpu/drm/nouveau/nvkm/engine/device/tegra.c
new file mode 100644
index 000000000..950a3de3e
--- /dev/null
+++ b/drivers/gpu/drm/nouveau/nvkm/engine/device/tegra.c
@@ -0,0 +1,379 @@
+/*
+ * Copyright (c) 2014, NVIDIA CORPORATION. All rights reserved.
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a
+ * copy of this software and associated documentation files (the "Software"),
+ * to deal in the Software without restriction, including without limitation
+ * the rights to use, copy, modify, merge, publish, distribute, sublicense,
+ * and/or sell copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
+ * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+ * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
+ * DEALINGS IN THE SOFTWARE.
+ */
+#include <core/tegra.h>
+#ifdef CONFIG_NOUVEAU_PLATFORM_DRIVER
+#include "priv.h"
+
+#if IS_ENABLED(CONFIG_ARM_DMA_USE_IOMMU)
+#include <asm/dma-iommu.h>
+#endif
+
+static int
+nvkm_device_tegra_power_up(struct nvkm_device_tegra *tdev)
+{
+	int ret;
+
+	if (tdev->vdd) {
+		ret = regulator_enable(tdev->vdd);
+		if (ret)
+			goto err_power;
+	}
+
+	ret = clk_prepare_enable(tdev->clk);
+	if (ret)
+		goto err_clk;
+	if (tdev->clk_ref) {
+		ret = clk_prepare_enable(tdev->clk_ref);
+		if (ret)
+			goto err_clk_ref;
+	}
+	ret = clk_prepare_enable(tdev->clk_pwr);
+	if (ret)
+		goto err_clk_pwr;
+	clk_set_rate(tdev->clk_pwr, 204000000);
+	udelay(10);
+
+	if (!tdev->pdev->dev.pm_domain) {
+		reset_control_assert(tdev->rst);
+		udelay(10);
+
+		ret = tegra_powergate_remove_clamping(TEGRA_POWERGATE_3D);
+		if (ret)
+			goto err_clamp;
+		udelay(10);
+
+		reset_control_deassert(tdev->rst);
+		udelay(10);
+	}
+
+	return 0;
+
+err_clamp:
+	clk_disable_unprepare(tdev->clk_pwr);
+err_clk_pwr:
+	if (tdev->clk_ref)
+		clk_disable_unprepare(tdev->clk_ref);
+err_clk_ref:
+	clk_disable_unprepare(tdev->clk);
+err_clk:
+	if (tdev->vdd)
+		regulator_disable(tdev->vdd);
+err_power:
+	return ret;
+}
+
+static int
+nvkm_device_tegra_power_down(struct nvkm_device_tegra *tdev)
+{
+	int ret;
+
+	clk_disable_unprepare(tdev->clk_pwr);
+	if (tdev->clk_ref)
+		clk_disable_unprepare(tdev->clk_ref);
+	clk_disable_unprepare(tdev->clk);
+	udelay(10);
+
+	if (tdev->vdd) {
+		ret = regulator_disable(tdev->vdd);
+		if (ret)
+			return ret;
+	}
+
+	return 0;
+}
+
+static void
+nvkm_device_tegra_probe_iommu(struct nvkm_device_tegra *tdev)
+{
+#if IS_ENABLED(CONFIG_IOMMU_API)
+	struct device *dev = &tdev->pdev->dev;
+	unsigned long pgsize_bitmap;
+	int ret;
+
+#if IS_ENABLED(CONFIG_ARM_DMA_USE_IOMMU)
+	if (dev->archdata.mapping) {
+		struct dma_iommu_mapping *mapping = to_dma_iommu_mapping(dev);
+
+		arm_iommu_detach_device(dev);
+		arm_iommu_release_mapping(mapping);
+	}
+#endif
+
+	if (!tdev->func->iommu_bit)
+		return;
+
+	mutex_init(&tdev->iommu.mutex);
+
+	if (device_iommu_mapped(dev)) {
+		tdev->iommu.domain = iommu_domain_alloc(&platform_bus_type);
+		if (!tdev->iommu.domain)
+			goto error;
+
+		/*
+		 * A IOMMU is only usable if it supports page sizes smaller
+		 * or equal to the system's PAGE_SIZE, with a preference if
+		 * both are equal.
+		 */
+		pgsize_bitmap = tdev->iommu.domain->ops->pgsize_bitmap;
+		if (pgsize_bitmap & PAGE_SIZE) {
+			tdev->iommu.pgshift = PAGE_SHIFT;
+		} else {
+			tdev->iommu.pgshift = fls(pgsize_bitmap & ~PAGE_MASK);
+			if (tdev->iommu.pgshift == 0) {
+				dev_warn(dev, "unsupported IOMMU page size\n");
+				goto free_domain;
+			}
+			tdev->iommu.pgshift -= 1;
+		}
+
+		ret = iommu_attach_device(tdev->iommu.domain, dev);
+		if (ret)
+			goto free_domain;
+
+		ret = nvkm_mm_init(&tdev->iommu.mm, 0, 0,
+				   (1ULL << tdev->func->iommu_bit) >>
+				   tdev->iommu.pgshift, 1);
+		if (ret)
+			goto detach_device;
+	}
+
+	return;
+
+detach_device:
+	iommu_detach_device(tdev->iommu.domain, dev);
+
+free_domain:
+	iommu_domain_free(tdev->iommu.domain);
+
+error:
+	tdev->iommu.domain = NULL;
+	tdev->iommu.pgshift = 0;
+	dev_err(dev, "cannot initialize IOMMU MM\n");
+#endif
+}
+
+static void
+nvkm_device_tegra_remove_iommu(struct nvkm_device_tegra *tdev)
+{
+#if IS_ENABLED(CONFIG_IOMMU_API)
+	if (tdev->iommu.domain) {
+		nvkm_mm_fini(&tdev->iommu.mm);
+		iommu_detach_device(tdev->iommu.domain, tdev->device.dev);
+		iommu_domain_free(tdev->iommu.domain);
+	}
+#endif
+}
+
+static struct nvkm_device_tegra *
+nvkm_device_tegra(struct nvkm_device *device)
+{
+	return container_of(device, struct nvkm_device_tegra, device);
+}
+
+static struct resource *
+nvkm_device_tegra_resource(struct nvkm_device *device, unsigned bar)
+{
+	struct nvkm_device_tegra *tdev = nvkm_device_tegra(device);
+	return platform_get_resource(tdev->pdev, IORESOURCE_MEM, bar);
+}
+
+static resource_size_t
+nvkm_device_tegra_resource_addr(struct nvkm_device *device, unsigned bar)
+{
+	struct resource *res = nvkm_device_tegra_resource(device, bar);
+	return res ? res->start : 0;
+}
+
+static resource_size_t
+nvkm_device_tegra_resource_size(struct nvkm_device *device, unsigned bar)
+{
+	struct resource *res = nvkm_device_tegra_resource(device, bar);
+	return res ? resource_size(res) : 0;
+}
+
+static irqreturn_t
+nvkm_device_tegra_intr(int irq, void *arg)
+{
+	struct nvkm_device_tegra *tdev = arg;
+	struct nvkm_device *device = &tdev->device;
+	bool handled = false;
+	nvkm_mc_intr_unarm(device);
+	nvkm_mc_intr(device, &handled);
+	nvkm_mc_intr_rearm(device);
+	return handled ? IRQ_HANDLED : IRQ_NONE;
+}
+
+static void
+nvkm_device_tegra_fini(struct nvkm_device *device, bool suspend)
+{
+	struct nvkm_device_tegra *tdev = nvkm_device_tegra(device);
+	if (tdev->irq) {
+		free_irq(tdev->irq, tdev);
+		tdev->irq = 0;
+	}
+}
+
+static int
+nvkm_device_tegra_init(struct nvkm_device *device)
+{
+	struct nvkm_device_tegra *tdev = nvkm_device_tegra(device);
+	int irq, ret;
+
+	irq = platform_get_irq_byname(tdev->pdev, "stall");
+	if (irq < 0)
+		return irq;
+
+	ret = request_irq(irq, nvkm_device_tegra_intr,
+			  IRQF_SHARED, "nvkm", tdev);
+	if (ret)
+		return ret;
+
+	tdev->irq = irq;
+	return 0;
+}
+
+static void *
+nvkm_device_tegra_dtor(struct nvkm_device *device)
+{
+	struct nvkm_device_tegra *tdev = nvkm_device_tegra(device);
+	nvkm_device_tegra_power_down(tdev);
+	nvkm_device_tegra_remove_iommu(tdev);
+	return tdev;
+}
+
+static const struct nvkm_device_func
+nvkm_device_tegra_func = {
+	.tegra = nvkm_device_tegra,
+	.dtor = nvkm_device_tegra_dtor,
+	.init = nvkm_device_tegra_init,
+	.fini = nvkm_device_tegra_fini,
+	.resource_addr = nvkm_device_tegra_resource_addr,
+	.resource_size = nvkm_device_tegra_resource_size,
+	.cpu_coherent = false,
+};
+
+int
+nvkm_device_tegra_new(const struct nvkm_device_tegra_func *func,
+		      struct platform_device *pdev,
+		      const char *cfg, const char *dbg,
+		      bool detect, bool mmio, u64 subdev_mask,
+		      struct nvkm_device **pdevice)
+{
+	struct nvkm_device_tegra *tdev;
+	unsigned long rate;
+	int ret;
+
+	if (!(tdev = kzalloc(sizeof(*tdev), GFP_KERNEL)))
+		return -ENOMEM;
+
+	tdev->func = func;
+	tdev->pdev = pdev;
+
+	if (func->require_vdd) {
+		tdev->vdd = devm_regulator_get(&pdev->dev, "vdd");
+		if (IS_ERR(tdev->vdd)) {
+			ret = PTR_ERR(tdev->vdd);
+			goto free;
+		}
+	}
+
+	tdev->rst = devm_reset_control_get(&pdev->dev, "gpu");
+	if (IS_ERR(tdev->rst)) {
+		ret = PTR_ERR(tdev->rst);
+		goto free;
+	}
+
+	tdev->clk = devm_clk_get(&pdev->dev, "gpu");
+	if (IS_ERR(tdev->clk)) {
+		ret = PTR_ERR(tdev->clk);
+		goto free;
+	}
+
+	rate = clk_get_rate(tdev->clk);
+	if (rate == 0) {
+		ret = clk_set_rate(tdev->clk, ULONG_MAX);
+		if (ret < 0)
+			goto free;
+
+		rate = clk_get_rate(tdev->clk);
+
+		dev_dbg(&pdev->dev, "GPU clock set to %lu\n", rate);
+	}
+
+	if (func->require_ref_clk)
+		tdev->clk_ref = devm_clk_get(&pdev->dev, "ref");
+	if (IS_ERR(tdev->clk_ref)) {
+		ret = PTR_ERR(tdev->clk_ref);
+		goto free;
+	}
+
+	tdev->clk_pwr = devm_clk_get(&pdev->dev, "pwr");
+	if (IS_ERR(tdev->clk_pwr)) {
+		ret = PTR_ERR(tdev->clk_pwr);
+		goto free;
+	}
+
+	/**
+	 * The IOMMU bit defines the upper limit of the GPU-addressable space.
+	 */
+	ret = dma_set_mask(&pdev->dev, DMA_BIT_MASK(tdev->func->iommu_bit));
+	if (ret)
+		goto free;
+
+	nvkm_device_tegra_probe_iommu(tdev);
+
+	ret = nvkm_device_tegra_power_up(tdev);
+	if (ret)
+		goto remove;
+
+	tdev->gpu_speedo = tegra_sku_info.gpu_speedo_value;
+	tdev->gpu_speedo_id = tegra_sku_info.gpu_speedo_id;
+	ret = nvkm_device_ctor(&nvkm_device_tegra_func, NULL, &pdev->dev,
+			       NVKM_DEVICE_TEGRA, pdev->id, NULL,
+			       cfg, dbg, detect, mmio, subdev_mask,
+			       &tdev->device);
+	if (ret)
+		goto powerdown;
+
+	*pdevice = &tdev->device;
+
+	return 0;
+
+powerdown:
+	nvkm_device_tegra_power_down(tdev);
+remove:
+	nvkm_device_tegra_remove_iommu(tdev);
+free:
+	kfree(tdev);
+	return ret;
+}
+#else
+int
+nvkm_device_tegra_new(const struct nvkm_device_tegra_func *func,
+		      struct platform_device *pdev,
+		      const char *cfg, const char *dbg,
+		      bool detect, bool mmio, u64 subdev_mask,
+		      struct nvkm_device **pdevice)
+{
+	return -ENOSYS;
+}
+#endif