[U-Boot] [PATCH v6 01/20] clk: Add Allwinner A64 CLK driver

[Jagan Teki <jagan@amarulasolutions.com>]

Add initial clock driver for Allwinner A64.

Implement USB clock enable and disable functions for
OHCI, EHCI, OTG and USBPHY gate and clock registers
via ccu clk gate table.

Signed-off-by: Jagan Teki <jagan@amarulasolutions.com>
Acked-by: Maxime Ripard <maxime.ripard@bootlin.com>
---
 arch/arm/include/asm/arch-sunxi/ccu.h | 65 +++++++++++++++++++++++
 drivers/clk/Kconfig                   |  1 +
 drivers/clk/Makefile                  |  1 +
 drivers/clk/sunxi/Kconfig             | 18 +++++++
 drivers/clk/sunxi/Makefile            |  9 ++++
 drivers/clk/sunxi/clk_a64.c           | 46 +++++++++++++++++
 drivers/clk/sunxi/clk_sunxi.c         | 74 +++++++++++++++++++++++++++
 7 files changed, 214 insertions(+)
 create mode 100644 arch/arm/include/asm/arch-sunxi/ccu.h
 create mode 100644 drivers/clk/sunxi/Kconfig
 create mode 100644 drivers/clk/sunxi/Makefile
 create mode 100644 drivers/clk/sunxi/clk_a64.c
 create mode 100644 drivers/clk/sunxi/clk_sunxi.c

diff --git a/arch/arm/include/asm/arch-sunxi/ccu.h b/arch/arm/include/asm/arch-sunxi/ccu.h
new file mode 100644
index 0000000000..24efe0ab0a
--- /dev/null
+++ b/arch/arm/include/asm/arch-sunxi/ccu.h
@@ -0,0 +1,65 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * Copyright (C) 2018 Amarula Solutions.
+ * Author: Jagan Teki <jagan@amarulasolutions.com>
+ */
+
+#ifndef _ASM_ARCH_CCU_H
+#define _ASM_ARCH_CCU_H
+
+/**
+ * enum ccu_flags - ccu clock flags
+ *
+ * @CCU_CLK_F_IS_VALID:		is given clock gate is valid?
+ */
+enum ccu_flags {
+	CCU_CLK_F_IS_VALID		= BIT(0),
+};
+
+/**
+ * struct ccu_clk_gate - ccu clock gate
+ * @off:	gate offset
+ * @bit:	gate bit
+ * @flags:	ccu clock gate flags
+ */
+struct ccu_clk_gate {
+	u16 off;
+	u32 bit;
+	enum ccu_flags flags;
+};
+
+#define GATE(_off, _bit) {			\
+	.off = _off,				\
+	.bit = _bit,				\
+	.flags = CCU_CLK_F_IS_VALID,		\
+}
+
+/**
+ * struct ccu_desc - clock control unit descriptor
+ *
+ * @gates:	clock gates
+ */
+struct ccu_desc {
+	const struct ccu_clk_gate *gates;
+};
+
+/**
+ * struct ccu_priv - sunxi clock control unit
+ *
+ * @base:	base address
+ * @desc:	ccu descriptor
+ */
+struct ccu_priv {
+	void *base;
+	const struct ccu_desc *desc;
+};
+
+/**
+ * sunxi_clk_probe - common sunxi clock probe
+ * @dev:	clock device
+ */
+int sunxi_clk_probe(struct udevice *dev);
+
+extern struct clk_ops sunxi_clk_ops;
+
+#endif /* _ASM_ARCH_CCU_H */
diff --git a/drivers/clk/Kconfig b/drivers/clk/Kconfig
index eadf7f8250..51c931b906 100644
--- a/drivers/clk/Kconfig
+++ b/drivers/clk/Kconfig
@@ -104,6 +104,7 @@ source "drivers/clk/imx/Kconfig"
 source "drivers/clk/mvebu/Kconfig"
 source "drivers/clk/owl/Kconfig"
 source "drivers/clk/renesas/Kconfig"
+source "drivers/clk/sunxi/Kconfig"
 source "drivers/clk/tegra/Kconfig"
 source "drivers/clk/uniphier/Kconfig"
 
diff --git a/drivers/clk/Makefile b/drivers/clk/Makefile
index 9acbb1a650..6a4ff9143b 100644
--- a/drivers/clk/Makefile
+++ b/drivers/clk/Makefile
@@ -22,6 +22,7 @@ obj-$(CONFIG_CLK_HSDK) += clk-hsdk-cgu.o
 obj-$(CONFIG_CLK_MPC83XX) += mpc83xx_clk.o
 obj-$(CONFIG_CLK_OWL) += owl/
 obj-$(CONFIG_CLK_RENESAS) += renesas/
+obj-$(CONFIG_ARCH_SUNXI) += sunxi/
 obj-$(CONFIG_CLK_STM32F) += clk_stm32f.o
 obj-$(CONFIG_CLK_STM32MP1) += clk_stm32mp1.o
 obj-$(CONFIG_CLK_UNIPHIER) += uniphier/
diff --git a/drivers/clk/sunxi/Kconfig b/drivers/clk/sunxi/Kconfig
new file mode 100644
index 0000000000..bf5ecb3801
--- /dev/null
+++ b/drivers/clk/sunxi/Kconfig
@@ -0,0 +1,18 @@
+config CLK_SUNXI
+	bool "Clock support for Allwinner SoCs"
+	depends on CLK && ARCH_SUNXI
+	default y
+	help
+	  This enables support for common clock driver API on Allwinner
+	  SoCs.
+
+if CLK_SUNXI
+
+config CLK_SUN50I_A64
+	bool "Clock driver for Allwinner A64"
+	default MACH_SUN50I
+	help
+	  This enables common clock driver support for platforms based
+	  on Allwinner A64 SoC.
+
+endif # CLK_SUNXI
diff --git a/drivers/clk/sunxi/Makefile b/drivers/clk/sunxi/Makefile
new file mode 100644
index 0000000000..fb20d28333
--- /dev/null
+++ b/drivers/clk/sunxi/Makefile
@@ -0,0 +1,9 @@
+#
+# Copyright (C) 2018 Amarula Solutions.
+#
+# SPDX-License-Identifier:      GPL-2.0+
+#
+
+obj-$(CONFIG_CLK_SUNXI) += clk_sunxi.o
+
+obj-$(CONFIG_CLK_SUN50I_A64) += clk_a64.o
diff --git a/drivers/clk/sunxi/clk_a64.c b/drivers/clk/sunxi/clk_a64.c
new file mode 100644
index 0000000000..803a2f711d
--- /dev/null
+++ b/drivers/clk/sunxi/clk_a64.c
@@ -0,0 +1,46 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * Copyright (C) 2018 Amarula Solutions.
+ * Author: Jagan Teki <jagan@amarulasolutions.com>
+ */
+
+#include <common.h>
+#include <clk-uclass.h>
+#include <dm.h>
+#include <errno.h>
+#include <asm/arch/ccu.h>
+#include <dt-bindings/clock/sun50i-a64-ccu.h>
+
+static const struct ccu_clk_gate a64_gates[] = {
+	[CLK_BUS_OTG]		= GATE(0x060, BIT(23)),
+	[CLK_BUS_EHCI0]		= GATE(0x060, BIT(24)),
+	[CLK_BUS_EHCI1]		= GATE(0x060, BIT(25)),
+	[CLK_BUS_OHCI0]		= GATE(0x060, BIT(28)),
+	[CLK_BUS_OHCI1]		= GATE(0x060, BIT(29)),
+
+	[CLK_USB_PHY0]		= GATE(0x0cc, BIT(8)),
+	[CLK_USB_PHY1]		= GATE(0x0cc, BIT(9)),
+	[CLK_USB_HSIC]		= GATE(0x0cc, BIT(10)),
+	[CLK_USB_HSIC_12M]	= GATE(0x0cc, BIT(11)),
+	[CLK_USB_OHCI0]		= GATE(0x0cc, BIT(16)),
+	[CLK_USB_OHCI1]		= GATE(0x0cc, BIT(17)),
+};
+
+static const struct ccu_desc a64_ccu_desc = {
+	.gates = a64_gates,
+};
+
+static const struct udevice_id a64_ccu_ids[] = {
+	{ .compatible = "allwinner,sun50i-a64-ccu",
+	  .data = (ulong)&a64_ccu_desc },
+	{ }
+};
+
+U_BOOT_DRIVER(clk_sun50i_a64) = {
+	.name		= "sun50i_a64_ccu",
+	.id		= UCLASS_CLK,
+	.of_match	= a64_ccu_ids,
+	.priv_auto_alloc_size	= sizeof(struct ccu_priv),
+	.ops		= &sunxi_clk_ops,
+	.probe		= sunxi_clk_probe,
+};
diff --git a/drivers/clk/sunxi/clk_sunxi.c b/drivers/clk/sunxi/clk_sunxi.c
new file mode 100644
index 0000000000..62ce2994e4
--- /dev/null
+++ b/drivers/clk/sunxi/clk_sunxi.c
@@ -0,0 +1,74 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * Copyright (C) 2018 Amarula Solutions.
+ * Author: Jagan Teki <jagan@amarulasolutions.com>
+ */
+
+#include <common.h>
+#include <clk-uclass.h>
+#include <dm.h>
+#include <errno.h>
+#include <asm/io.h>
+#include <asm/arch/ccu.h>
+#include <linux/log2.h>
+
+static const struct ccu_clk_gate *priv_to_gate(struct ccu_priv *priv,
+					       unsigned long id)
+{
+	return &priv->desc->gates[id];
+}
+
+static int sunxi_set_gate(struct clk *clk, bool on)
+{
+	struct ccu_priv *priv = dev_get_priv(clk->dev);
+	const struct ccu_clk_gate *gate = priv_to_gate(priv, clk->id);
+	u32 reg;
+
+	if (!(gate->flags & CCU_CLK_F_IS_VALID)) {
+		printf("%s: (CLK#%ld) unhandled\n", __func__, clk->id);
+		return 0;
+	}
+
+	debug("%s: (CLK#%ld) off#0x%x, BIT(%d)\n", __func__,
+	      clk->id, gate->off, ilog2(gate->bit));
+
+	reg = readl(priv->base + gate->off);
+	if (on)
+		reg |= gate->bit;
+	else
+		reg &= ~gate->bit;
+
+	writel(reg, priv->base + gate->off);
+
+	return 0;
+}
+
+static int sunxi_clk_enable(struct clk *clk)
+{
+	return sunxi_set_gate(clk, true);
+}
+
+static int sunxi_clk_disable(struct clk *clk)
+{
+	return sunxi_set_gate(clk, false);
+}
+
+struct clk_ops sunxi_clk_ops = {
+	.enable = sunxi_clk_enable,
+	.disable = sunxi_clk_disable,
+};
+
+int sunxi_clk_probe(struct udevice *dev)
+{
+	struct ccu_priv *priv = dev_get_priv(dev);
+
+	priv->base = dev_read_addr_ptr(dev);
+	if (!priv->base)
+		return -ENOMEM;
+
+	priv->desc = (const struct ccu_desc *)dev_get_driver_data(dev);
+	if (!priv->desc)
+		return -EINVAL;
+
+	return 0;
+}
-- 
2.18.0.321.gffc6fa0e3