diff options
| -rw-r--r-- | drivers/clk/tegra/Kconfig | 7 | ||||
| -rw-r--r-- | drivers/clk/tegra/Makefile | 1 | ||||
| -rw-r--r-- | drivers/clk/tegra/tegra-car-clk.c | 103 |
3 files changed, 111 insertions, 0 deletions
diff --git a/drivers/clk/tegra/Kconfig b/drivers/clk/tegra/Kconfig index 659fe022c2..ce80b1ff3e 100644 --- a/drivers/clk/tegra/Kconfig +++ b/drivers/clk/tegra/Kconfig @@ -1,3 +1,10 @@ +config TEGRA_CAR_CLOCK + bool "Enable Tegra CAR-based clock driver" + depends on TEGRA_CAR + help + Enable support for manipulating Tegra's on-SoC clocks via direct + register access to the Tegra CAR (Clock And Reset controller). + config TEGRA186_CLOCK bool "Enable Tegra186 BPMP-based clock driver" depends on TEGRA186_BPMP diff --git a/drivers/clk/tegra/Makefile b/drivers/clk/tegra/Makefile index f32998ccc2..0fcc5205a7 100644 --- a/drivers/clk/tegra/Makefile +++ b/drivers/clk/tegra/Makefile @@ -2,4 +2,5 @@ # # SPDX-License-Identifier: GPL-2.0 +obj-$(CONFIG_TEGRA_CAR_CLOCK) += tegra-car-clk.o obj-$(CONFIG_TEGRA186_CLOCK) += tegra186-clk.o diff --git a/drivers/clk/tegra/tegra-car-clk.c b/drivers/clk/tegra/tegra-car-clk.c new file mode 100644 index 0000000000..b8a2c82a25 --- /dev/null +++ b/drivers/clk/tegra/tegra-car-clk.c @@ -0,0 +1,103 @@ +/* + * Copyright (c) 2016, NVIDIA CORPORATION. + * + * SPDX-License-Identifier: GPL-2.0 + */ + +#include <common.h> +#include <clk-uclass.h> +#include <dm.h> +#include <asm/arch/clock.h> +#include <asm/arch-tegra/clk_rst.h> + +static int tegra_car_clk_request(struct clk *clk) +{ + debug("%s(clk=%p) (dev=%p, id=%lu)\n", __func__, clk, clk->dev, + clk->id); + + /* + * Note that the first PERIPH_ID_COUNT clock IDs (where the value + * varies per SoC) are the peripheral clocks, which use a numbering + * scheme that matches HW registers 1:1. There are other clock IDs + * beyond this that are assigned arbitrarily by the Tegra CAR DT + * binding. Due to the implementation of this driver, it currently + * only supports the peripheral IDs. + */ + if (clk->id >= PERIPH_ID_COUNT) + return -EINVAL; + + return 0; +} + +static int tegra_car_clk_free(struct clk *clk) +{ + debug("%s(clk=%p) (dev=%p, id=%lu)\n", __func__, clk, clk->dev, + clk->id); + + return 0; +} + +static ulong tegra_car_clk_get_rate(struct clk *clk) +{ + enum clock_id parent; + + debug("%s(clk=%p) (dev=%p, id=%lu)\n", __func__, clk, clk->dev, + clk->id); + + parent = clock_get_periph_parent(clk->id); + return clock_get_periph_rate(clk->id, parent); +} + +static ulong tegra_car_clk_set_rate(struct clk *clk, ulong rate) +{ + enum clock_id parent; + + debug("%s(clk=%p, rate=%lu) (dev=%p, id=%lu)\n", __func__, clk, rate, + clk->dev, clk->id); + + parent = clock_get_periph_parent(clk->id); + return clock_adjust_periph_pll_div(clk->id, parent, rate, NULL); +} + +static int tegra_car_clk_enable(struct clk *clk) +{ + debug("%s(clk=%p) (dev=%p, id=%lu)\n", __func__, clk, clk->dev, + clk->id); + + clock_enable(clk->id); + + return 0; +} + +static int tegra_car_clk_disable(struct clk *clk) +{ + debug("%s(clk=%p) (dev=%p, id=%lu)\n", __func__, clk, clk->dev, + clk->id); + + clock_disable(clk->id); + + return 0; +} + +static struct clk_ops tegra_car_clk_ops = { + .request = tegra_car_clk_request, + .free = tegra_car_clk_free, + .get_rate = tegra_car_clk_get_rate, + .set_rate = tegra_car_clk_set_rate, + .enable = tegra_car_clk_enable, + .disable = tegra_car_clk_disable, +}; + +static int tegra_car_clk_probe(struct udevice *dev) +{ + debug("%s(dev=%p)\n", __func__, dev); + + return 0; +} + +U_BOOT_DRIVER(tegra_car_clk) = { + .name = "tegra_car_clk", + .id = UCLASS_CLK, + .probe = tegra_car_clk_probe, + .ops = &tegra_car_clk_ops, +}; |