[PATCH v2 02/15] clk: sunxi-ng: Add common infrastructure

Maxime Ripard
2016-06-07T20:41:41Z

Start our new clock infrastructure by adding the registration code, common
structure and common code.

Signed-off-by: Maxime Ripard <maxime.ripard@free-electrons.com>

---
Changes from v1:
- Moved from of_iomap to of_io_request_and_map
- Change lock bit feature name to PLL_LOCK
- Fixed bug in clocks description array iteration
- Changed clock register offset size to u16
---
drivers/clk/Makefile | 1 +
drivers/clk/sunxi-ng/Makefile | 2 +
drivers/clk/sunxi-ng/ccu_common.c | 99 +++++++++++++++++++++++++++++++++++++++
drivers/clk/sunxi-ng/ccu_common.h | 74 +++++++++++++++++++++++++++++
drivers/clk/sunxi-ng/ccu_mult.h | 15 ++++++
drivers/clk/sunxi-ng/ccu_reset.c | 55 ++++++++++++++++++++++
drivers/clk/sunxi-ng/ccu_reset.h | 40 ++++++++++++++++
7 files changed, 286 insertions(+)
create mode 100644 drivers/clk/sunxi-ng/Makefile
create mode 100644 drivers/clk/sunxi-ng/ccu_common.c
create mode 100644 drivers/clk/sunxi-ng/ccu_common.h
create mode 100644 drivers/clk/sunxi-ng/ccu_mult.h
create mode 100644 drivers/clk/sunxi-ng/ccu_reset.c
create mode 100644 drivers/clk/sunxi-ng/ccu_reset.h

diff --git a/drivers/clk/Makefile b/drivers/clk/Makefile
index dcc5e698ff6d..7a44a1526d60 100644
--- a/drivers/clk/Makefile
+++ b/drivers/clk/Makefile
@@ -79,6 +79,7 @@ obj-$(CONFIG_ARCH_SOCFPGA) += socfpga/
obj-$(CONFIG_PLAT_SPEAR) += spear/
obj-$(CONFIG_ARCH_STI) += st/
obj-$(CONFIG_ARCH_SUNXI) += sunxi/
+obj-$(CONFIG_ARCH_SUNXI) += sunxi-ng/
obj-$(CONFIG_ARCH_TEGRA) += tegra/
obj-y += ti/
obj-$(CONFIG_ARCH_U8500) += ux500/
diff --git a/drivers/clk/sunxi-ng/Makefile b/drivers/clk/sunxi-ng/Makefile
new file mode 100644
index 000000000000..bd3461b0f38c
--- /dev/null
+++ b/drivers/clk/sunxi-ng/Makefile
@@ -0,0 +1,2 @@
+obj-y += ccu_common.o
+obj-y += ccu_reset.o
diff --git a/drivers/clk/sunxi-ng/ccu_common.c b/drivers/clk/sunxi-ng/ccu_common.c
new file mode 100644
index 000000000000..618fb26974c8
--- /dev/null
+++ b/drivers/clk/sunxi-ng/ccu_common.c
@@ -0,0 +1,99 @@
+/*
+ * Copyright 2016 Maxime Ripard
+ *
+ * Maxime Ripard <maxime.ripard@free-electrons.com>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ */
+
+#include <linux/clk-provider.h>
+#include <linux/iopoll.h>
+#include <linux/slab.h>
+
+#include "ccu_common.h"
+#include "ccu_reset.h"
+
+static DEFINE_SPINLOCK(ccu_lock);
+
+void ccu_helper_wait_for_lock(struct ccu_common *common, u32 lock)
+{
+ u32 reg;
+
+ if (!(common->features & CCU_FEATURE_PLL_LOCK))
+ return;
+
+ WARN_ON(readl_relaxed_poll_timeout(common->base + common->reg, reg,
+ !(reg & lock), 100, 70000));
+}
+
+int sunxi_ccu_probe(struct device_node *node, void __iomem *reg,
+ const struct sunxi_ccu_desc *desc)
+{
+ struct ccu_common **cclks = desc->clks;
+ size_t num_clks = desc->num_clks;
+ struct clk_onecell_data *data;
+ struct ccu_reset *reset;
+ struct clk **clks;
+ int i, ret;
+
+ data = kzalloc(sizeof(*data), GFP_KERNEL);
+ if (!data)
+ return -ENOMEM;
+
+ clks = kcalloc(num_clks, sizeof(struct clk *), GFP_KERNEL);
+ if (!clks)
+ return -ENOMEM;
+
+ data->clks = clks;
+ data->clk_num = num_clks;
+
+ for (i = 0; i < num_clks; i++) {
+ struct ccu_common *cclk = cclks[i];
+ struct clk *clk;
+
+ if (!cclk) {
+ clks[i] = ERR_PTR(-ENOENT);
+ continue;
+ }
+
+ cclk->base = reg;
+ cclk->lock = &ccu_lock;
+
+ clk = clk_register(NULL, &cclk->hw);
+ if (IS_ERR(clk))
+ continue;
+
+ clks[i] = clk;
+ }
+
+ ret = of_clk_add_provider(node, of_clk_src_onecell_get, data);
+ if (ret)
+ goto err_clk_unreg;
+
+ reset = kzalloc(sizeof(*reset), GFP_KERNEL);
+ reset->rcdev.of_node = node;
+ reset->rcdev.ops = &ccu_reset_ops;
+ reset->rcdev.owner = THIS_MODULE;
+ reset->rcdev.nr_resets = desc->num_resets;
+ reset->base = reg;
+ reset->lock = &ccu_lock;
+ reset->reset_map = desc->resets;
+
+ ret = reset_controller_register(&reset->rcdev);
+ if (ret)
+ goto err_of_clk_unreg;
+
+ return 0;
+
+err_of_clk_unreg:
+err_clk_unreg:
+ return ret;
+}
diff --git a/drivers/clk/sunxi-ng/ccu_common.h b/drivers/clk/sunxi-ng/ccu_common.h
new file mode 100644
index 000000000000..fda245020273
--- /dev/null
+++ b/drivers/clk/sunxi-ng/ccu_common.h
@@ -0,0 +1,74 @@
+/*
+ * Copyright (c) 2016 Maxime Ripard. All rights reserved.
+ *
+ * This software is licensed under the terms of the GNU General Public
+ * License version 2, as published by the Free Software Foundation, and
+ * may be copied, distributed, and modified under those terms.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ */
+
+#ifndef _COMMON_H_
+#define _COMMON_H_
+
+#include <linux/compiler.h>
+#include <linux/clk-provider.h>
+
+#define CCU_FEATURE_GATE BIT(0)
+#define CCU_FEATURE_PLL_LOCK BIT(1)
+#define CCU_FEATURE_FRACTIONAL BIT(2)
+#define CCU_FEATURE_VARIABLE_PREDIV BIT(3)
+#define CCU_FEATURE_FIXED_PREDIV BIT(4)
+#define CCU_FEATURE_FIXED_POSTDIV BIT(5)
+
+struct device_node;
+
+#define SUNXI_HW_INIT(_name, _parent, _ops, _flags) \
+ &(struct clk_init_data) { \
+ .flags = _flags, \
+ .name = _name, \
+ .parent_names = (const char *[]) { _parent }, \
+ .num_parents = 1, \
+ .ops = _ops, \
+ }
+
+#define SUNXI_HW_INIT_PARENTS(_name, _parents, _ops, _flags) \
+ &(struct clk_init_data) { \
+ .flags = _flags, \
+ .name = _name, \
+ .parent_names = _parents, \
+ .num_parents = ARRAY_SIZE(_parents), \
+ .ops = _ops, \
+ }
+
+struct ccu_common {
+ void __iomem *base;
+ u16 reg;
+
+ unsigned long features;
+ spinlock_t *lock;
+ struct clk_hw hw;
+};
+
+static inline struct ccu_common *hw_to_ccu_common(struct clk_hw *hw)
+{
+ return container_of(hw, struct ccu_common, hw);
+}
+
+struct sunxi_ccu_desc {
+ struct ccu_common **clks;
+ unsigned long num_clks;
+
+ struct ccu_reset_map *resets;
+ unsigned long num_resets;
+};
+
+void ccu_helper_wait_for_lock(struct ccu_common *common, u32 lock);
+
+int sunxi_ccu_probe(struct device_node *node, void __iomem *reg,
+ const struct sunxi_ccu_desc *desc);
+
+#endif /* _COMMON_H_ */
diff --git a/drivers/clk/sunxi-ng/ccu_mult.h b/drivers/clk/sunxi-ng/ccu_mult.h
new file mode 100644
index 000000000000..609db6610880
--- /dev/null
+++ b/drivers/clk/sunxi-ng/ccu_mult.h
@@ -0,0 +1,15 @@
+#ifndef _CCU_MULT_H_
+#define _CCU_MULT_H_
+
+struct _ccu_mult {
+ u8 shift;
+ u8 width;
+};
+
+#define _SUNXI_CCU_MULT(_shift, _width) \
+ { \
+ .shift = _shift, \
+ .width = _width, \
+ }
+
+#endif /* _CCU_MULT_H_ */
diff --git a/drivers/clk/sunxi-ng/ccu_reset.c b/drivers/clk/sunxi-ng/ccu_reset.c
new file mode 100644
index 000000000000..6c31d48783a7
--- /dev/null
+++ b/drivers/clk/sunxi-ng/ccu_reset.c
@@ -0,0 +1,55 @@
+/*
+ * Copyright (C) 2016 Maxime Ripard
+ * Maxime Ripard <maxime.ripard@free-electrons.com>
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License as
+ * published by the Free Software Foundation; either version 2 of
+ * the License, or (at your option) any later version.
+ */
+
+#include <linux/io.h>
+#include <linux/reset-controller.h>
+
+#include "ccu_reset.h"
+
+static int ccu_reset_assert(struct reset_controller_dev *rcdev,
+ unsigned long id)
+{
+ struct ccu_reset *ccu = rcdev_to_ccu_reset(rcdev);
+ const struct ccu_reset_map *map = &ccu->reset_map[id];
+ unsigned long flags;
+ u32 reg;
+
+ spin_lock_irqsave(ccu->lock, flags);
+
+ reg = readl(ccu->base + map->reg);
+ writel(reg & ~map->bit, ccu->base + map->reg);
+
+ spin_unlock_irqrestore(ccu->lock, flags);
+
+ return 0;
+}
+
+static int ccu_reset_deassert(struct reset_controller_dev *rcdev,
+ unsigned long id)
+{
+ struct ccu_reset *ccu = rcdev_to_ccu_reset(rcdev);
+ const struct ccu_reset_map *map = &ccu->reset_map[id];
+ unsigned long flags;
+ u32 reg;
+
+ spin_lock_irqsave(ccu->lock, flags);
+
+ reg = readl(ccu->base + map->reg);
+ writel(reg | map->bit, ccu->base + map->reg);
+
+ spin_unlock_irqrestore(ccu->lock, flags);
+
+ return 0;
+}
+
+const struct reset_control_ops ccu_reset_ops = {
+ .assert = ccu_reset_assert,
+ .deassert = ccu_reset_deassert,
+};
diff --git a/drivers/clk/sunxi-ng/ccu_reset.h b/drivers/clk/sunxi-ng/ccu_reset.h
new file mode 100644
index 000000000000..36a4679210bd
--- /dev/null
+++ b/drivers/clk/sunxi-ng/ccu_reset.h
@@ -0,0 +1,40 @@
+/*
+ * Copyright (c) 2016 Maxime Ripard. All rights reserved.
+ *
+ * This software is licensed under the terms of the GNU General Public
+ * License version 2, as published by the Free Software Foundation, and
+ * may be copied, distributed, and modified under those terms.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ */
+
+#ifndef _CCU_RESET_H_
+#define _CCU_RESET_H_
+
+#include <linux/reset-controller.h>
+
+struct ccu_reset_map {
+ u16 reg;
+ u32 bit;
+};
+
+
+struct ccu_reset {
+ void __iomem *base;
+ struct ccu_reset_map *reset_map;
+ spinlock_t *lock;
+
+ struct reset_controller_dev rcdev;
+};
+
+static inline struct ccu_reset *rcdev_to_ccu_reset(struct reset_controller_dev *rcdev)
+{
+ return container_of(rcdev, struct ccu_reset, rcdev);
+}
+
+extern const struct reset_control_ops ccu_reset_ops;
+
+#endif /* _CCU_RESET_H_ */
--
2.8.3