[Uboot-stm32] [PATCH 21/36] clk/ccf: add CCF_FULL port of clk_sandbox

[Casey Connolly]

It isn't possible to reuse UCLASS_CLK drivers with full CCF, so
introduce a full CCF port of clk_sandbox. This behaves the same and is
used by the generic clk tests when CCF_FULL is enabled.

Signed-off-by: Casey Connolly <casey.connolly at linaro.org>
---
 drivers/clk/ccf/Makefile      |   1 +
 drivers/clk/ccf/clk_sandbox.c | 281 ++++++++++++++++++++++++++++++++++++++++++
 2 files changed, 282 insertions(+)

diff --git a/drivers/clk/ccf/Makefile b/drivers/clk/ccf/Makefile
index 2d319eb24fff..aa97c74066ec 100644
--- a/drivers/clk/ccf/Makefile
+++ b/drivers/clk/ccf/Makefile
@@ -15,4 +15,5 @@ obj-y += clk.o \
 
 obj-$(CONFIG_CLK_COMPOSITE_CCF) += clk-composite.o
 
 obj-$(CONFIG_SANDBOX_CLK_CCF) += clk_sandbox_ccf_full.o
+obj-$(CONFIG_SANDBOX) += clk_sandbox.o
diff --git a/drivers/clk/ccf/clk_sandbox.c b/drivers/clk/ccf/clk_sandbox.c
new file mode 100644
index 000000000000..57cc0fc07649
--- /dev/null
+++ b/drivers/clk/ccf/clk_sandbox.c
@@ -0,0 +1,281 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * (C) Copyright 2015 Google, Inc
+ */
+
+#include <clk-uclass.h>
+#include <dm.h>
+#include <dm/devres.h>
+#include <errno.h>
+#include <malloc.h>
+#include <asm/clk.h>
+#include <linux/clk-provider.h>
+
+struct sandbox_clk_hw {
+	struct clk_hw hw;
+	enum sandbox_clk_id id;
+};
+
+static ulong sandbox_clk_recalc_rate(struct clk_hw *hw, ulong parent_rate)
+{
+	struct sandbox_clk_hw *shw = container_of(hw, struct sandbox_clk_hw, hw);
+	struct sandbox_clk_priv *priv = dev_get_priv(hw->clk->dev);
+	ulong id = shw->id;
+
+	if (!priv->probed)
+		return -ENODEV;
+
+	if (id >= SANDBOX_CLK_ID_COUNT)
+		return -EINVAL;
+
+	return priv->rate[id];
+}
+
+static long sandbox_clk_round_rate(struct clk_hw *hw, ulong rate, ulong *parent_rate)
+{
+	struct sandbox_clk_hw *shw = container_of(hw, struct sandbox_clk_hw, hw);
+	struct sandbox_clk_priv *priv = dev_get_priv(hw->clk->dev);
+	ulong id = shw->id;
+
+	if (!priv->probed)
+		return -ENODEV;
+
+	if (id >= SANDBOX_CLK_ID_COUNT)
+		return -EINVAL;
+
+	if (!rate)
+		return -EINVAL;
+
+	return rate;
+}
+
+static int sandbox_clk_set_rate(struct clk_hw *hw, ulong rate, ulong parent_rate)
+{
+	struct sandbox_clk_hw *shw = container_of(hw, struct sandbox_clk_hw, hw);
+	struct sandbox_clk_priv *priv = dev_get_priv(hw->clk->dev);
+	ulong old_rate;
+	ulong id = shw->id;
+
+	if (!priv->probed)
+		return -ENODEV;
+
+	if (id >= SANDBOX_CLK_ID_COUNT)
+		return -EINVAL;
+
+	if (!rate)
+		return -EINVAL;
+
+	old_rate = priv->rate[id];
+	priv->rate[id] = rate;
+
+	return 0;
+}
+
+static int sandbox_clk_enable(struct clk_hw *hw)
+{
+	struct sandbox_clk_hw *shw = container_of(hw, struct sandbox_clk_hw, hw);
+	struct sandbox_clk_priv *priv = dev_get_priv(hw->clk->dev);
+	ulong id = shw->id;
+
+	if (!priv->probed)
+		return -ENODEV;
+
+	if (id >= SANDBOX_CLK_ID_COUNT)
+		return -EINVAL;
+
+	priv->enabled[id] = true;
+
+	return 0;
+}
+
+static void sandbox_clk_disable(struct clk_hw *hw)
+{
+	struct sandbox_clk_hw *shw = container_of(hw, struct sandbox_clk_hw, hw);
+	struct sandbox_clk_priv *priv = dev_get_priv(hw->clk->dev);
+	ulong id = shw->id;
+
+	if (!priv->probed)
+		return;
+
+	if (id >= SANDBOX_CLK_ID_COUNT)
+		return;
+
+	priv->enabled[id] = false;
+}
+
+static int sandbox_clk_request(struct clk_hw *hw)
+{
+	struct sandbox_clk_hw *shw = container_of(hw, struct sandbox_clk_hw, hw);
+	struct sandbox_clk_priv *priv = dev_get_priv(hw->clk->dev);
+	ulong id = shw->id;
+
+	if (id >= SANDBOX_CLK_ID_COUNT)
+		return -EINVAL;
+
+	priv->requested[id] = true;
+	return 0;
+}
+
+static struct clk_ops sandbox_clk_ops = {
+	.round_rate	= sandbox_clk_round_rate,
+	.recalc_rate	= sandbox_clk_recalc_rate,
+	.set_rate	= sandbox_clk_set_rate,
+	.enable		= sandbox_clk_enable,
+	.disable	= sandbox_clk_disable,
+	.init		= sandbox_clk_request,
+};
+
+static struct sandbox_clk_hw sandbox_clk_hws[SANDBOX_CLK_ID_COUNT] = {
+	{
+		.hw.init = &(struct clk_init_data) {
+			.name = "spi",
+			.ops = &sandbox_clk_ops,
+		},
+		.id = SANDBOX_CLK_ID_SPI,
+	},
+	{
+		.hw.init = &(struct clk_init_data) {
+			.name = "i2c",
+			.ops = &sandbox_clk_ops,
+		},
+		.id = SANDBOX_CLK_ID_I2C,
+	},
+	{
+		.hw.init = &(struct clk_init_data) {
+			.name = "uart1",
+			.ops = &sandbox_clk_ops,
+		},
+		.id = SANDBOX_CLK_ID_UART1,
+	},
+	{
+		.hw.init = &(struct clk_init_data) {
+			.name = "uart2",
+			.ops = &sandbox_clk_ops,
+		},
+		.id = SANDBOX_CLK_ID_UART2,
+	},
+	{
+		.hw.init = &(struct clk_init_data) {
+			.name = "bus",
+			.ops = &sandbox_clk_ops,
+		},
+		.id = SANDBOX_CLK_ID_BUS,
+	},
+};
+
+struct clk_hw *sbox_get_hw(struct ofnode_phandle_args *clkspec, void *data)
+{
+	struct sandbox_clk_hw *shws = data;
+	unsigned int idx = clkspec->args[0];
+
+	if (idx >= SANDBOX_CLK_ID_COUNT) {
+		pr_err("%s: invalid index %u\n", __func__, idx);
+		return ERR_PTR(-EINVAL);
+	}
+
+	return &shws[idx].hw;
+}
+
+static int sandbox_clk_probe(struct udevice *dev)
+{
+	struct sandbox_clk_priv *priv = dev_get_priv(dev);
+	struct sandbox_clk_hw *shws;
+	int ret;
+
+	/* We can't re-use the struct clk_hw since it will be modified. This driver may be probed multiple times. */
+	shws = devm_kcalloc(dev, SANDBOX_CLK_ID_COUNT, sizeof(struct sandbox_clk_hw), GFP_KERNEL);
+	if (!shws)
+		return -ENOMEM;
+
+	priv->probed = true;
+
+	for (int i = 0; i < SANDBOX_CLK_ID_COUNT; i++) {
+		memcpy(&shws[i], &sandbox_clk_hws[i], sizeof(struct sandbox_clk_hw));
+		ret = devm_clk_hw_register(dev, &shws[i].hw);
+		if (ret)
+			return ret;
+	}
+
+	return devm_of_clk_add_hw_provider(dev, sbox_get_hw, shws);
+}
+
+static const struct udevice_id sandbox_clk_ids[] = {
+	{ .compatible = "sandbox,clk" },
+	{ }
+};
+
+U_BOOT_DRIVER(sandbox_clk) = {
+	.name		= "sandbox_clk",
+	.id		= UCLASS_NOP,
+	.of_match	= sandbox_clk_ids,
+	.probe		= sandbox_clk_probe,
+	.priv_auto	= sizeof(struct sandbox_clk_priv),
+};
+
+ulong sandbox_clk_query_rate(struct udevice *dev, int id)
+{
+	struct sandbox_clk_priv *priv = dev_get_priv(dev);
+
+	if (id < 0 || id >= SANDBOX_CLK_ID_COUNT)
+		return -EINVAL;
+
+	return priv->rate[id];
+}
+
+int sandbox_clk_query_enable(struct udevice *dev, int id)
+{
+	struct sandbox_clk_priv *priv = dev_get_priv(dev);
+
+	if (id < 0 || id >= SANDBOX_CLK_ID_COUNT)
+		return -EINVAL;
+
+	return priv->enabled[id];
+}
+
+int sandbox_clk_query_requested(struct udevice *dev, int id)
+{
+	struct sandbox_clk_priv *priv = dev_get_priv(dev);
+
+	if (id < 0 || id >= SANDBOX_CLK_ID_COUNT)
+		return -EINVAL;
+	return priv->requested[id];
+}
+
+static int clk_fixed_rate_probe(struct udevice *dev)
+{
+	ofnode node = dev_ofnode(dev);
+	const char *clk_name;
+	struct clk_hw *hw;
+	u32 rate = 0;
+	int ret;
+
+	ofnode_read_u32(node, "clock-frequency", &rate);
+
+	clk_name = ofnode_read_string(node, "clock-output-names");
+	if (!clk_name)
+		clk_name = ofnode_get_name(node);
+
+	hw = clk_hw_register_fixed_rate(dev, clk_name, NULL, 0, rate);
+	if (IS_ERR(hw))
+		return PTR_ERR(hw);
+
+	ret = of_clk_add_hw_provider(node, of_clk_hw_simple_get, hw);
+	if (ret) {
+		clk_hw_unregister_fixed_rate(hw);
+		return ret;
+	}
+
+	return 0;
+}
+
+static const struct udevice_id sandbox_clk_fixed_rate_match[] = {
+	{ .compatible = "sandbox,fixed-clock" },
+	{ /* sentinel */ }
+};
+
+U_BOOT_DRIVER(sandbox_fixed_clock) = {
+	.name = "sandbox_fixed_clock",
+	.id = UCLASS_NOP,
+	.of_match = sandbox_clk_fixed_rate_match,
+	.probe = clk_fixed_rate_probe,
+};

-- 
2.55.0