clock: add Tegra186 clock driver
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>
Signed-off-by: Tom Warren <twarren@nvidia.com>
diff --git a/drivers/clk/tegra/tegra186-clk.c b/drivers/clk/tegra/tegra186-clk.c
new file mode 100644
index 0000000..075cb46
--- /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,
+};