From: Stephen Warren swarren@nvidia.com
In Tegra186, on-SoC clocks are manipulated using IPC requests to the BPMP (Boot and Power Management Processor). This change implements a driver that does that. A tegra/ sub-directory is created to follow the existing pattern. It is unconditionally selected by CONFIG_TEGRA186 since virtually any Tegra186 build of U-Boot will need the feature.
Signed-off-by: Stephen Warren swarren@nvidia.com Reviewed-by: Simon Glass sjg@chromium.org --- v4: Adapt to new misc_call() return code. v3: Use misc class call op. v2: This patch wasn't posted. --- arch/arm/mach-tegra/Kconfig | 2 + drivers/clk/Kconfig | 1 + drivers/clk/Makefile | 2 + drivers/clk/tegra/Kconfig | 6 +++ drivers/clk/tegra/Makefile | 5 ++ drivers/clk/tegra/tegra186-clk.c | 104 +++++++++++++++++++++++++++++++++++++++ 6 files changed, 120 insertions(+) create mode 100644 drivers/clk/tegra/Kconfig create mode 100644 drivers/clk/tegra/Makefile create mode 100644 drivers/clk/tegra/tegra186-clk.c
diff --git a/arch/arm/mach-tegra/Kconfig b/arch/arm/mach-tegra/Kconfig index ec2d8ac6a1a3..e8186d515856 100644 --- a/arch/arm/mach-tegra/Kconfig +++ b/arch/arm/mach-tegra/Kconfig @@ -64,9 +64,11 @@ config TEGRA210
config TEGRA186 bool "Tegra186 family" + select CLK select DM_MAILBOX select MISC select TEGRA186_BPMP + select TEGRA186_CLOCK select TEGRA186_GPIO select TEGRA_ARMV8_COMMON select TEGRA_HSP diff --git a/drivers/clk/Kconfig b/drivers/clk/Kconfig index 6eee8eb369bf..7dd56738b06a 100644 --- a/drivers/clk/Kconfig +++ b/drivers/clk/Kconfig @@ -20,6 +20,7 @@ config SPL_CLK setting up clocks within SPL, and allows the same drivers to be used as U-Boot proper.
+source "drivers/clk/tegra/Kconfig" source "drivers/clk/uniphier/Kconfig" source "drivers/clk/exynos/Kconfig"
diff --git a/drivers/clk/Makefile b/drivers/clk/Makefile index 3cbdd54f4f3e..463b1d647dc6 100644 --- a/drivers/clk/Makefile +++ b/drivers/clk/Makefile @@ -10,5 +10,7 @@ obj-$(CONFIG_ARCH_ROCKCHIP) += rockchip/ obj-$(CONFIG_SANDBOX) += clk_sandbox.o obj-$(CONFIG_SANDBOX) += clk_sandbox_test.o obj-$(CONFIG_MACH_PIC32) += clk_pic32.o + +obj-y += tegra/ obj-$(CONFIG_CLK_UNIPHIER) += uniphier/ obj-$(CONFIG_CLK_EXYNOS) += exynos/ diff --git a/drivers/clk/tegra/Kconfig b/drivers/clk/tegra/Kconfig new file mode 100644 index 000000000000..659fe022c2af --- /dev/null +++ b/drivers/clk/tegra/Kconfig @@ -0,0 +1,6 @@ +config TEGRA186_CLOCK + bool "Enable Tegra186 BPMP-based clock driver" + depends on TEGRA186_BPMP + help + Enable support for manipulating Tegra's on-SoC clocks via IPC + requests to the BPMP (Boot and Power Management Processor). diff --git a/drivers/clk/tegra/Makefile b/drivers/clk/tegra/Makefile new file mode 100644 index 000000000000..f32998ccc27d --- /dev/null +++ b/drivers/clk/tegra/Makefile @@ -0,0 +1,5 @@ +# Copyright (c) 2016, NVIDIA CORPORATION. +# +# SPDX-License-Identifier: GPL-2.0 + +obj-$(CONFIG_TEGRA186_CLOCK) += tegra186-clk.o diff --git a/drivers/clk/tegra/tegra186-clk.c b/drivers/clk/tegra/tegra186-clk.c new file mode 100644 index 000000000000..075cb464cf6f --- /dev/null +++ b/drivers/clk/tegra/tegra186-clk.c @@ -0,0 +1,104 @@ +/* + * Copyright (c) 2016, NVIDIA CORPORATION. + * + * SPDX-License-Identifier: GPL-2.0 + */ + +#include <common.h> +#include <clk-uclass.h> +#include <dm.h> +#include <misc.h> +#include <asm/arch-tegra/bpmp_abi.h> + +static ulong tegra186_clk_get_rate(struct clk *clk) +{ + struct mrq_clk_request req; + struct mrq_clk_response resp; + int ret; + + debug("%s(clk=%p) (dev=%p, id=%lu)\n", __func__, clk, clk->dev, + clk->id); + + req.cmd_and_id = (CMD_CLK_GET_RATE << 24) | clk->id; + + ret = misc_call(clk->dev->parent, MRQ_CLK, &req, sizeof(req), &resp, + sizeof(resp)); + if (ret < 0) + return ret; + + return resp.clk_get_rate.rate; +} + +static ulong tegra186_clk_set_rate(struct clk *clk, ulong rate) +{ + struct mrq_clk_request req; + struct mrq_clk_response resp; + int ret; + + debug("%s(clk=%p, rate=%lu) (dev=%p, id=%lu)\n", __func__, clk, rate, + clk->dev, clk->id); + + req.cmd_and_id = (CMD_CLK_SET_RATE << 24) | clk->id; + req.clk_set_rate.rate = rate; + + ret = misc_call(clk->dev->parent, MRQ_CLK, &req, sizeof(req), &resp, + sizeof(resp)); + if (ret < 0) + return ret; + + return resp.clk_set_rate.rate; +} + +static int tegra186_clk_en_dis(struct clk *clk, + enum mrq_reset_commands cmd) +{ + struct mrq_clk_request req; + struct mrq_clk_response resp; + int ret; + + req.cmd_and_id = (cmd << 24) | clk->id; + + ret = misc_call(clk->dev->parent, MRQ_CLK, &req, sizeof(req), &resp, + sizeof(resp)); + if (ret < 0) + return ret; + + return 0; +} + +static int tegra186_clk_enable(struct clk *clk) +{ + debug("%s(clk=%p) (dev=%p, id=%lu)\n", __func__, clk, clk->dev, + clk->id); + + return tegra186_clk_en_dis(clk, CMD_CLK_ENABLE); +} + +static int tegra186_clk_disable(struct clk *clk) +{ + debug("%s(clk=%p) (dev=%p, id=%lu)\n", __func__, clk, clk->dev, + clk->id); + + return tegra186_clk_en_dis(clk, CMD_CLK_DISABLE); +} + +static struct clk_ops tegra186_clk_ops = { + .get_rate = tegra186_clk_get_rate, + .set_rate = tegra186_clk_set_rate, + .enable = tegra186_clk_enable, + .disable = tegra186_clk_disable, +}; + +static int tegra186_clk_probe(struct udevice *dev) +{ + debug("%s(dev=%p)\n", __func__, dev); + + return 0; +} + +U_BOOT_DRIVER(tegra186_clk) = { + .name = "tegra186_clk", + .id = UCLASS_CLK, + .probe = tegra186_clk_probe, + .ops = &tegra186_clk_ops, +};