[PATCH 5/7] clk: sunxi: add PRCM (Power/Reset/Clock Management) clks support

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The PRCM (Power/Reset/Clock Management) unit provides several clock
devices:
- AR100 clk: used to clock the Power Management co-processor
- AHB0 clk: used to clock the AHB0 bus
- APB0 clk and gates: used to clk

Add support for these clks in a separate driver so that they can be probed
as platform devices instead of registered during early init.
We need this to be able to probe PRCM MFD subdevices.

Signed-off-by: Boris BREZILLON <boris.brezillon@xxxxxxxxxxxxxxxxxx>
---
 drivers/clk/sunxi/Makefile         |   2 +
 drivers/clk/sunxi/clk-sun6i-prcm.c | 253 +++++++++++++++++++++++++++++++++++++
 2 files changed, 255 insertions(+)
 create mode 100644 drivers/clk/sunxi/clk-sun6i-prcm.c

diff --git a/drivers/clk/sunxi/Makefile b/drivers/clk/sunxi/Makefile
index b5bac91..ef8cdc9 100644
--- a/drivers/clk/sunxi/Makefile
+++ b/drivers/clk/sunxi/Makefile
@@ -3,3 +3,5 @@
 #
 
 obj-y += clk-sunxi.o clk-factors.o
+
+obj-$(CONFIG_MFD_SUN6I_PRCM) += clk-sun6i-prcm.o
diff --git a/drivers/clk/sunxi/clk-sun6i-prcm.c b/drivers/clk/sunxi/clk-sun6i-prcm.c
new file mode 100644
index 0000000..bb7b25a
--- /dev/null
+++ b/drivers/clk/sunxi/clk-sun6i-prcm.c
@@ -0,0 +1,253 @@
+/*
+ * Copyright (C) 2014 Free Electrons
+ *
+ * License Terms: GNU General Public License v2
+ * Author: Boris BREZILLON <boris.brezillon@xxxxxxxxxxxxxxxxxx>
+ *
+ * Allwinner PRCM (Power/Reset/Clock Management) driver
+ *
+ */
+
+#include <linux/clk-provider.h>
+#include <linux/module.h>
+#include <linux/of.h>
+#include <linux/platform_device.h>
+
+#define SUN6I_APB0_GATES_MAX_SIZE	32
+#define SUN6I_AR100_MAX_PARENTS		4
+
+static int sun6i_a31_ar100_mux_clk_register(struct platform_device *pdev)
+{
+	const char *parents[SUN6I_AR100_MAX_PARENTS];
+	struct device_node *np = pdev->dev.of_node;
+	const char *clk_name = np->name;
+	struct resource *r;
+	void __iomem *reg;
+	struct clk *clk;
+	int nparents;
+	int i;
+
+	r = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+	reg = devm_ioremap(&pdev->dev, r->start, resource_size(r));
+	if (IS_ERR(reg))
+		return PTR_ERR(reg);
+
+	nparents = of_clk_get_parent_count(np);
+	if (nparents > SUN6I_AR100_MAX_PARENTS)
+		nparents = SUN6I_AR100_MAX_PARENTS;
+
+	for (i = 0; i < nparents; i++)
+		parents[i] = of_clk_get_parent_name(np, i);
+
+	of_property_read_string(np, "clock-output-names", &clk_name);
+
+	clk = clk_register_mux(&pdev->dev, clk_name, parents, nparents,
+			       CLK_SET_RATE_NO_REPARENT, reg,
+			       16, 2, 0, NULL);
+	if (IS_ERR(clk))
+		return PTR_ERR(clk);
+
+	return of_clk_add_provider(np, of_clk_src_simple_get, clk);
+}
+
+static int sun6i_a31_ar100_clk_register(struct platform_device *pdev)
+{
+	struct device_node *np = pdev->dev.of_node;
+	const char *clk_name = np->name;
+	const char *clk_parent;
+	struct resource *r;
+	void __iomem *reg;
+	struct clk *clk;
+
+	r = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+	reg = devm_ioremap(&pdev->dev, r->start, resource_size(r));
+	if (IS_ERR(reg))
+		return PTR_ERR(reg);
+
+	clk_parent = of_clk_get_parent_name(np, 0);
+	if (!clk_parent)
+		return -EINVAL;
+
+	of_property_read_string(np, "clock-output-names", &clk_name);
+
+	clk = clk_register_divider(&pdev->dev, clk_name, clk_parent,
+				   0, reg, 4, 2, CLK_DIVIDER_POWER_OF_TWO,
+				   NULL);
+	if (IS_ERR(clk))
+		return PTR_ERR(clk);
+
+	return of_clk_add_provider(np, of_clk_src_simple_get, clk);
+}
+
+static int sun6i_a31_ar100_div_clk_register(struct platform_device *pdev)
+{
+	struct device_node *np = pdev->dev.of_node;
+	const char *clk_name = np->name;
+	const char *clk_parent;
+	struct resource *r;
+	void __iomem *reg;
+	struct clk *clk;
+
+	r = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+	reg = devm_ioremap(&pdev->dev, r->start, resource_size(r));
+	if (IS_ERR(reg))
+		return PTR_ERR(reg);
+
+	clk_parent = of_clk_get_parent_name(np, 0);
+	if (!clk_parent)
+		return -EINVAL;
+
+	of_property_read_string(np, "clock-output-names", &clk_name);
+
+	clk = clk_register_divider(&pdev->dev, clk_name, clk_parent,
+				   0, reg, 8, 5, 0, NULL);
+	if (IS_ERR(clk))
+		return PTR_ERR(clk);
+
+	return of_clk_add_provider(np, of_clk_src_simple_get, clk);
+}
+
+static int sun6i_a31_apb0_clk_register(struct platform_device *pdev)
+{
+	struct device_node *np = pdev->dev.of_node;
+	const char *clk_name = np->name;
+	const char *clk_parent;
+	struct resource *r;
+	void __iomem *reg;
+	struct clk *clk;
+
+	r = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+	reg = devm_ioremap_resource(&pdev->dev, r);
+	if (IS_ERR(reg))
+		return PTR_ERR(reg);
+
+	clk_parent = of_clk_get_parent_name(np, 0);
+	if (!clk_parent)
+		return -EINVAL;
+
+	of_property_read_string(np, "clock-output-names", &clk_name);
+
+	clk = clk_register_divider(&pdev->dev, clk_name, clk_parent,
+				   0, reg, 0, 2, CLK_DIVIDER_POWER_OF_TWO,
+				   NULL);
+	if (IS_ERR(clk))
+		return PTR_ERR(clk);
+
+	return of_clk_add_provider(np, of_clk_src_simple_get, clk);
+}
+
+static int sun6i_a31_apb0_gates_clk_register(struct platform_device *pdev)
+{
+	struct device_node *np = pdev->dev.of_node;
+	struct clk_onecell_data *clk_data;
+	const char *clk_parent;
+	const char *clk_name;
+	struct resource *r;
+	void __iomem *reg;
+	int gate_id;
+	int ngates;
+	int i;
+
+	r = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+	reg = devm_ioremap_resource(&pdev->dev, r);
+	if (!reg)
+		return PTR_ERR(reg);
+
+	clk_parent = of_clk_get_parent_name(np, 0);
+	if (!clk_parent)
+		return -EINVAL;
+
+	ngates = of_property_count_strings(np, "clock-output-names");
+	if (ngates < 0)
+		return ngates;
+
+	if (!ngates || ngates > SUN6I_APB0_GATES_MAX_SIZE)
+		return -EINVAL;
+
+	clk_data = devm_kzalloc(&pdev->dev, sizeof(struct clk_onecell_data),
+				GFP_KERNEL);
+	if (!clk_data)
+		return -ENOMEM;
+
+	clk_data->clks = devm_kzalloc(&pdev->dev,
+				      SUN6I_APB0_GATES_MAX_SIZE *
+				      sizeof(struct clk *),
+				      GFP_KERNEL);
+	if (!clk_data->clks)
+		return -ENOMEM;
+
+	for (i = 0; i < ngates; i++) {
+		of_property_read_string_index(np, "clock-output-names",
+					      i, &clk_name);
+
+		gate_id = i;
+		of_property_read_u32_index(np, "clock-indices", i, &gate_id);
+
+		WARN_ON(gate_id >= SUN6I_APB0_GATES_MAX_SIZE);
+		if (gate_id >= SUN6I_APB0_GATES_MAX_SIZE)
+			continue;
+
+		clk_data->clks[gate_id] = clk_register_gate(&pdev->dev,
+							    clk_name,
+							    clk_parent, 0,
+							    reg, gate_id,
+							    0, NULL);
+		WARN_ON(IS_ERR(clk_data->clks[gate_id]));
+	}
+
+	clk_data->clk_num = ngates;
+
+	return of_clk_add_provider(np, of_clk_src_onecell_get, clk_data);
+}
+
+const struct of_device_id sun6i_a31_prcm_clk_dt_ids[] = {
+	{
+		.compatible = "allwinner,sun6i-a31-ar100-mux-clk",
+		.data = sun6i_a31_ar100_mux_clk_register,
+	},
+	{
+		.compatible = "allwinner,sun6i-a31-ar100-clk",
+		.data = sun6i_a31_ar100_clk_register,
+	},
+	{
+		.compatible = "allwinner,sun6i-a31-ar100-div-clk",
+		.data = sun6i_a31_ar100_div_clk_register,
+	},
+	{
+		.compatible = "allwinner,sun6i-a31-apb0-clk",
+		.data = sun6i_a31_apb0_clk_register,
+	},
+	{
+		.compatible = "allwinner,sun6i-a31-apb0-gates-clk",
+		.data = sun6i_a31_apb0_gates_clk_register,
+	},
+	{ /* sentinel */ }
+};
+
+static int sun6i_a31_prcm_clk_probe(struct platform_device *pdev)
+{
+	struct device_node *np = pdev->dev.of_node;
+	int (*register_func)(struct platform_device *pdev);
+	const struct of_device_id *match;
+
+	match = of_match_node(sun6i_a31_prcm_clk_dt_ids, np);
+	if (!match)
+		return -EINVAL;
+
+	register_func = match->data;
+	return register_func(pdev);
+}
+
+static struct platform_driver sun6i_a31_prcm_clk_driver = {
+	.driver = {
+		.name = "sun6i-a31-prcm-clk",
+		.owner = THIS_MODULE,
+		.of_match_table = sun6i_a31_prcm_clk_dt_ids,
+	},
+	.probe = sun6i_a31_prcm_clk_probe,
+};
+module_platform_driver(sun6i_a31_prcm_clk_driver);
+
+MODULE_AUTHOR("Boris BREZILLON <boris.brezillon@xxxxxxxxxxxxxxxxxx");
+MODULE_DESCRIPTION("Allwinner Reset Controller Driver");
+MODULE_LICENSE("GPL v2");
-- 
1.8.3.2

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