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authorLucas Stach <dev@lynxeye.de>2017-03-19 19:13:52 +0100
committerSascha Hauer <s.hauer@pengutronix.de>2017-03-30 08:23:22 +0200
commit01421974ca27f165af6942a6b86e31777ff180ee (patch)
tree2309e415d90f81504404ee0964c4645d6665865c
parentbca44fac7d322e65794c0b93507015d5465c2fe5 (diff)
downloadbarebox-01421974ca27f165af6942a6b86e31777ff180ee.tar.gz
add driver for Tegra124 memory controller
This driver performs the required initialization to get the GPU into a functional state, so it can be used when the OS is running. Signed-off-by: Lucas Stach <dev@lynxeye.de> Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
-rw-r--r--drivers/Kconfig1
-rw-r--r--drivers/Makefile1
-rw-r--r--drivers/memory/Kconfig11
-rw-r--r--drivers/memory/Makefile1
-rw-r--r--drivers/memory/mc-tegra124.c75
5 files changed, 89 insertions, 0 deletions
diff --git a/drivers/Kconfig b/drivers/Kconfig
index bf31115..ab9afb5 100644
--- a/drivers/Kconfig
+++ b/drivers/Kconfig
@@ -34,5 +34,6 @@ source "drivers/rtc/Kconfig"
source "drivers/firmware/Kconfig"
source "drivers/phy/Kconfig"
source "drivers/crypto/Kconfig"
+source "drivers/memory/Kconfig"
endmenu
diff --git a/drivers/Makefile b/drivers/Makefile
index 0fadf4e..a1d2d23 100644
--- a/drivers/Makefile
+++ b/drivers/Makefile
@@ -35,3 +35,4 @@ obj-$(CONFIG_GENERIC_PHY) += phy/
obj-$(CONFIG_HAB) += hab/
obj-$(CONFIG_CRYPTO_HW) += crypto/
obj-$(CONFIG_AIODEV) += aiodev/
+obj-y += memory/
diff --git a/drivers/memory/Kconfig b/drivers/memory/Kconfig
new file mode 100644
index 0000000..39fd644
--- /dev/null
+++ b/drivers/memory/Kconfig
@@ -0,0 +1,11 @@
+menu "Memory controller drivers"
+
+config MC_TEGRA124
+ bool "Support for Tegra124 memory controller"
+ depends on ARCH_TEGRA
+ help
+ Say yes here to include the driver for the memory controller found on
+ the Tegra124 SoC. This driver performs the necessary initialization
+ to provide a function GPU when the OS is running.
+
+endmenu
diff --git a/drivers/memory/Makefile b/drivers/memory/Makefile
new file mode 100644
index 0000000..bd5ace9
--- /dev/null
+++ b/drivers/memory/Makefile
@@ -0,0 +1 @@
+obj-$(CONFIG_MC_TEGRA124) += mc-tegra124.o
diff --git a/drivers/memory/mc-tegra124.c b/drivers/memory/mc-tegra124.c
new file mode 100644
index 0000000..a8d1609
--- /dev/null
+++ b/drivers/memory/mc-tegra124.c
@@ -0,0 +1,75 @@
+/* *
+ * Copyright (C) 2017 Lucas Stach <l.stach@pengutronix.de>
+ *
+ * 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 <common.h>
+#include <init.h>
+#include <io.h>
+#include <of.h>
+
+#define MC_VIDEO_PROTECT_SIZE_MB 0x64c
+#define MC_VIDEO_PROTECT_REG_CTRL 0x650
+#define MC_VIDEO_PROTECT_REG_WR_DIS (1 << 0)
+
+static int tegra124_mc_of_fixup(struct device_node *root, void *context)
+{
+ struct device_node *np;
+
+ np = of_find_compatible_node(root, NULL, "nvidia,gk20a");
+ if (np)
+ of_device_enable(np);
+
+ return 0;
+}
+
+static int tegra124_mc_probe(struct device_d *dev)
+{
+ struct resource *iores;
+ void __iomem *base;
+
+ iores = dev_request_mem_resource(dev, 0);
+ if (IS_ERR(iores)) {
+ dev_err(dev, "could not get memory region\n");
+ return PTR_ERR(iores);
+ }
+ base = IOMEM(iores->start);
+
+ /* disable video protect region */
+ writel(0 , base + MC_VIDEO_PROTECT_SIZE_MB);
+ writel(MC_VIDEO_PROTECT_REG_WR_DIS, base + MC_VIDEO_PROTECT_REG_CTRL);
+ readl(base + MC_VIDEO_PROTECT_REG_CTRL); /* readback to flush */
+
+ return of_register_fixup(tegra124_mc_of_fixup, NULL);
+}
+
+static __maybe_unused struct of_device_id tegra124_mc_dt_ids[] = {
+ {
+ .compatible = "nvidia,tegra124-mc",
+ }, {
+ /* sentinel */
+ },
+};
+
+static struct driver_d tegra124_mc_driver = {
+ .name = "tegra124-mc",
+ .of_compatible = DRV_OF_COMPAT(tegra124_mc_dt_ids),
+ .probe = tegra124_mc_probe,
+};
+
+static int __init tegra124_mc_init(void)
+{
+ return platform_driver_register(&tegra124_mc_driver);
+}
+device_initcall(tegra124_mc_init);