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 <d...@lynxeye.de> --- drivers/Kconfig | 1 + drivers/Makefile | 1 + drivers/memory/Kconfig | 11 +++++++ drivers/memory/Makefile | 1 + drivers/memory/mc-tegra124.c | 75 ++++++++++++++++++++++++++++++++++++++++++++ 5 files changed, 89 insertions(+) create mode 100644 drivers/memory/Kconfig create mode 100644 drivers/memory/Makefile create mode 100644 drivers/memory/mc-tegra124.c 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.st...@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); -- 2.9.3 _______________________________________________ barebox mailing list barebox@lists.infradead.org http://lists.infradead.org/mailman/listinfo/barebox
