gpu: host1x: Add host1x driver
Add host1x, the driver for host1x and its client unit 2D. The Tegra
host1x module is the DMA engine for register access to Tegra's
graphics- and multimedia-related modules. The modules served by
host1x are referred to as clients. host1x includes some other
functionality, such as synchronization.
Signed-off-by: Arto Merilainen <amerilainen@nvidia.com>
Signed-off-by: Terje Bergstrom <tbergstrom@nvidia.com>
Reviewed-by: Thierry Reding <thierry.reding@avionic-design.de>
Tested-by: Thierry Reding <thierry.reding@avionic-design.de>
Tested-by: Erik Faye-Lund <kusmabite@gmail.com>
Signed-off-by: Thierry Reding <thierry.reding@avionic-design.de>
diff --git a/drivers/gpu/host1x/dev.c b/drivers/gpu/host1x/dev.c
new file mode 100644
index 0000000..0d6002c
--- /dev/null
+++ b/drivers/gpu/host1x/dev.c
@@ -0,0 +1,153 @@
+/*
+ * Tegra host1x driver
+ *
+ * Copyright (c) 2010-2013, NVIDIA Corporation.
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms and conditions of the GNU General Public License,
+ * version 2, as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
+ * more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program. If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include <linux/module.h>
+#include <linux/list.h>
+#include <linux/slab.h>
+#include <linux/of.h>
+#include <linux/of_device.h>
+#include <linux/clk.h>
+#include <linux/io.h>
+
+#define CREATE_TRACE_POINTS
+#include <trace/events/host1x.h>
+
+#include "dev.h"
+#include "hw/host1x01.h"
+
+void host1x_sync_writel(struct host1x *host1x, u32 v, u32 r)
+{
+ void __iomem *sync_regs = host1x->regs + host1x->info->sync_offset;
+
+ writel(v, sync_regs + r);
+}
+
+u32 host1x_sync_readl(struct host1x *host1x, u32 r)
+{
+ void __iomem *sync_regs = host1x->regs + host1x->info->sync_offset;
+
+ return readl(sync_regs + r);
+}
+
+static const struct host1x_info host1x01_info = {
+ .nb_channels = 8,
+ .nb_pts = 32,
+ .nb_mlocks = 16,
+ .nb_bases = 8,
+ .init = host1x01_init,
+ .sync_offset = 0x3000,
+};
+
+static struct of_device_id host1x_of_match[] = {
+ { .compatible = "nvidia,tegra30-host1x", .data = &host1x01_info, },
+ { .compatible = "nvidia,tegra20-host1x", .data = &host1x01_info, },
+ { },
+};
+MODULE_DEVICE_TABLE(of, host1x_of_match);
+
+static int host1x_probe(struct platform_device *pdev)
+{
+ const struct of_device_id *id;
+ struct host1x *host;
+ struct resource *regs;
+ int syncpt_irq;
+ int err;
+
+ id = of_match_device(host1x_of_match, &pdev->dev);
+ if (!id)
+ return -EINVAL;
+
+ regs = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+ if (!regs) {
+ dev_err(&pdev->dev, "failed to get registers\n");
+ return -ENXIO;
+ }
+
+ syncpt_irq = platform_get_irq(pdev, 0);
+ if (syncpt_irq < 0) {
+ dev_err(&pdev->dev, "failed to get IRQ\n");
+ return -ENXIO;
+ }
+
+ host = devm_kzalloc(&pdev->dev, sizeof(*host), GFP_KERNEL);
+ if (!host)
+ return -ENOMEM;
+
+ host->dev = &pdev->dev;
+ host->info = id->data;
+
+ /* set common host1x device data */
+ platform_set_drvdata(pdev, host);
+
+ host->regs = devm_ioremap_resource(&pdev->dev, regs);
+ if (IS_ERR(host->regs))
+ return PTR_ERR(host->regs);
+
+ if (host->info->init) {
+ err = host->info->init(host);
+ if (err)
+ return err;
+ }
+
+ host->clk = devm_clk_get(&pdev->dev, NULL);
+ if (IS_ERR(host->clk)) {
+ dev_err(&pdev->dev, "failed to get clock\n");
+ err = PTR_ERR(host->clk);
+ return err;
+ }
+
+ err = clk_prepare_enable(host->clk);
+ if (err < 0) {
+ dev_err(&pdev->dev, "failed to enable clock\n");
+ return err;
+ }
+
+ err = host1x_syncpt_init(host);
+ if (err) {
+ dev_err(&pdev->dev, "failed to initialize syncpts\n");
+ return err;
+ }
+
+ return 0;
+}
+
+static int __exit host1x_remove(struct platform_device *pdev)
+{
+ struct host1x *host = platform_get_drvdata(pdev);
+
+ host1x_syncpt_deinit(host);
+ clk_disable_unprepare(host->clk);
+
+ return 0;
+}
+
+static struct platform_driver platform_driver = {
+ .probe = host1x_probe,
+ .remove = __exit_p(host1x_remove),
+ .driver = {
+ .owner = THIS_MODULE,
+ .name = "tegra-host1x",
+ .of_match_table = host1x_of_match,
+ },
+};
+
+module_platform_driver(platform_driver);
+
+MODULE_AUTHOR("Terje Bergstrom <tbergstrom@nvidia.com>");
+MODULE_DESCRIPTION("Host1x driver for Tegra products");
+MODULE_LICENSE("GPL");