[PATCH 03/19] clk: sunxi: Add TCON channel0 clock

Maxime Ripard
2015-10-30T14:20:49Z

The TCON is a controller generating the timings to output videos signals,
acting like both a CRTC and an encoder.

It has two channels depending on the output, each channel being driven by
its own clock (and own clock controller).

Add a driver for the channel 0 clock.

Signed-off-by: Maxime Ripard <maxime.ripard-wi1+55ScJUtKEb57/3fJTNBPR1lH4CV8@public.gmane.org>
---
drivers/clk/sunxi/Makefile | 1 +
drivers/clk/sunxi/clk-sun4i-tcon-ch0.c | 173 +++++++++++++++++++++++++++++++++
2 files changed, 174 insertions(+)
create mode 100644 drivers/clk/sunxi/clk-sun4i-tcon-ch0.c

diff --git a/drivers/clk/sunxi/Makefile b/drivers/clk/sunxi/Makefile
index 40c32ffd912c..7821b2b63d58 100644
--- a/drivers/clk/sunxi/Makefile
+++ b/drivers/clk/sunxi/Makefile
@@ -12,6 +12,7 @@ obj-y += clk-mod0.o
obj-y += clk-simple-gates.o
obj-y += clk-sun4i-display.o
obj-y += clk-sun4i-pll3.o
+obj-y += clk-sun4i-tcon-ch0.o
obj-y += clk-sun8i-mbus.o
obj-y += clk-sun9i-core.o
obj-y += clk-sun9i-mmc.o
diff --git a/drivers/clk/sunxi/clk-sun4i-tcon-ch0.c b/drivers/clk/sunxi/clk-sun4i-tcon-ch0.c
new file mode 100644
index 000000000000..db10cfb94a1d
--- /dev/null
+++ b/drivers/clk/sunxi/clk-sun4i-tcon-ch0.c
@@ -0,0 +1,173 @@
+/*
+ * Copyright 2015 Maxime Ripard
+ *
+ * Maxime Ripard <maxime.ripard-wi1+55ScJUtKEb57/3fJTNBPR1lH4CV8@public.gmane.org>
+ *
+ * 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/of_address.h>
+#include <linux/reset-controller.h>
+#include <linux/slab.h>
+#include <linux/spinlock.h>
+
+#define SUN4I_A10_TCON_CH0_PARENTS 4
+
+#define SUN4I_A10_TCON_CH0_GATE_BIT 31
+#define SUN4I_A10_TCON_CH0_RESET_SHIFT 29
+#define SUN4I_A10_TCON_CH0_MUX_MASK 3
+#define SUN4I_A10_TCON_CH0_MUX_SHIFT 24
+
+struct reset_data {
+ void __iomem *reg;
+ spinlock_t *lock;
+ struct reset_controller_dev rcdev;
+};
+
+static DEFINE_SPINLOCK(sun4i_a10_tcon_ch0_lock);
+
+static int sun4i_a10_tcon_ch0_assert(struct reset_controller_dev *rcdev,
+ unsigned long id)
+{
+ struct reset_data *data = container_of(rcdev,
+ struct reset_data,
+ rcdev);
+ unsigned long flags;
+ u32 reg;
+
+ spin_lock_irqsave(data->lock, flags);
+
+ reg = readl(data->reg);
+ writel(reg & ~BIT(SUN4I_A10_TCON_CH0_RESET_SHIFT + id), data->reg);
+
+ spin_unlock_irqrestore(data->lock, flags);
+
+ return 0;
+}
+
+static int sun4i_a10_tcon_ch0_deassert(struct reset_controller_dev *rcdev,
+ unsigned long id)
+{
+ struct reset_data *data = container_of(rcdev,
+ struct reset_data,
+ rcdev);
+ unsigned long flags;
+ u32 reg;
+
+ spin_lock_irqsave(data->lock, flags);
+
+ reg = readl(data->reg);
+ writel(reg | BIT(SUN4I_A10_TCON_CH0_RESET_SHIFT + id), data->reg);
+
+ spin_unlock_irqrestore(data->lock, flags);
+
+ return 0;
+}
+
+static int sun4i_a10_tcon_ch0_status(struct reset_controller_dev *rcdev,
+ unsigned long id)
+{
+ struct reset_data *data = container_of(rcdev,
+ struct reset_data,
+ rcdev);
+
+ return !(readl(data->reg) & BIT(SUN4I_A10_TCON_CH0_RESET_SHIFT + id));
+}
+
+static struct reset_control_ops sun4i_a10_tcon_ch0_reset_ops = {
+ .assert = sun4i_a10_tcon_ch0_assert,
+ .deassert = sun4i_a10_tcon_ch0_deassert,
+ .status = sun4i_a10_tcon_ch0_status,
+};
+
+static void __init sun4i_a10_tcon_ch0_setup(struct device_node *node)
+{
+ const char *parents[SUN4I_A10_TCON_CH0_PARENTS];
+ const char *clk_name = node->name;
+ struct reset_data *reset_data;
+ struct clk_gate *gate;
+ struct clk_mux *mux;
+ void __iomem *reg;
+ struct clk *clk;
+ int i;
+
+ of_property_read_string(node, "clock-output-names", &clk_name);
+
+ reg = of_io_request_and_map(node, 0, of_node_full_name(node));
+ if (IS_ERR(reg)) {
+ pr_err("%s: Could not map the clock registers\n", clk_name);
+ return;
+ }
+
+ for (i = 0; i < SUN4I_A10_TCON_CH0_PARENTS; i++)
+ parents[i] = of_clk_get_parent_name(node, i);
+
+ mux = kzalloc(sizeof(*mux), GFP_KERNEL);
+ if (!mux)
+ return;
+
+ mux->reg = reg;
+ mux->shift = SUN4I_A10_TCON_CH0_MUX_SHIFT;
+ mux->mask = SUN4I_A10_TCON_CH0_MUX_MASK;
+ mux->lock = &sun4i_a10_tcon_ch0_lock;
+
+ gate = kzalloc(sizeof(*gate), GFP_KERNEL);
+ if (!gate)
+ goto free_mux;
+
+ gate->reg = reg;
+ gate->bit_idx = SUN4I_A10_TCON_CH0_GATE_BIT;
+ gate->lock = &sun4i_a10_tcon_ch0_lock;
+
+ clk = clk_register_composite(NULL, clk_name,
+ parents, SUN4I_A10_TCON_CH0_PARENTS,
+ &mux->hw, &clk_mux_ops,
+ NULL, NULL,
+ &gate->hw, &clk_gate_ops,
+ 0);
+ if (IS_ERR(clk)) {
+ pr_err("%s: Couldn't register the clock\n", clk_name);
+ goto free_gate;
+ }
+
+ of_clk_add_provider(node, of_clk_src_simple_get, clk);
+
+ reset_data = kzalloc(sizeof(*reset_data), GFP_KERNEL);
+ if (!reset_data)
+ goto free_clk;
+
+ reset_data->reg = reg;
+ reset_data->lock = &sun4i_a10_tcon_ch0_lock;
+ reset_data->rcdev.nr_resets = 2;
+ reset_data->rcdev.ops = &sun4i_a10_tcon_ch0_reset_ops;
+ reset_data->rcdev.of_node = node;
+
+ if (reset_controller_register(&reset_data->rcdev)) {
+ pr_err("%s: Couldn't register the reset controller\n",
+ clk_name);
+ goto free_reset;
+ }
+
+ return;
+
+free_reset:
+ kfree(reset_data);
+free_clk:
+ clk_unregister(clk);
+free_gate:
+ kfree(gate);
+free_mux:
+ kfree(mux);
+}
+
+CLK_OF_DECLARE(sun4i_a10_tcon_ch0, "allwinner,sun4i-a10-tcon-ch0-clk",
+ sun4i_a10_tcon_ch0_setup);
--
2.6.2