[RFC PATCH 1/5] clk: sunxi: Add a driver for the PLL2 on A31/23/33
Icenowy Zheng
icenowy at aosc.xyz
Tue Jun 28 03:13:21 PDT 2016
This is based on the PLL2 driver for A10/20.
Signed-off-by: Icenowy Zheng <icenowy at aosc.xyz>
---
drivers/clk/sunxi/Makefile | 1 +
drivers/clk/sunxi/clk-a31-pll2.c | 194 +++++++++++++++++++++++++++++++++++++++
2 files changed, 195 insertions(+)
create mode 100644 drivers/clk/sunxi/clk-a31-pll2.c
diff --git a/drivers/clk/sunxi/Makefile b/drivers/clk/sunxi/Makefile
index 39d2044..951992e 100644
--- a/drivers/clk/sunxi/Makefile
+++ b/drivers/clk/sunxi/Makefile
@@ -9,6 +9,7 @@ obj-y += clk-a10-mod1.o
obj-y += clk-a10-pll2.o
obj-y += clk-a10-ve.o
obj-y += clk-a20-gmac.o
+obj-y += clk-a31-pll2.o
obj-y += clk-mod0.o
obj-y += clk-simple-gates.o
obj-y += clk-sun4i-display.o
diff --git a/drivers/clk/sunxi/clk-a31-pll2.c b/drivers/clk/sunxi/clk-a31-pll2.c
new file mode 100644
index 0000000..3fdd98b
--- /dev/null
+++ b/drivers/clk/sunxi/clk-a31-pll2.c
@@ -0,0 +1,194 @@
+/*
+ * Copyright 2013 Emilio López
+ * Emilio López <emilio at elopez.com.ar>
+ *
+ * Copyright 2015 Maxime Ripard
+ * Maxime Ripard <maxime.ripard at free-electrons.com>
+ *
+ * Copyright 2016 Icenowy Zheng
+ * Icenowy Zheng <icenowy at aosc.xyz>
+ *
+ * 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.h>
+#include <linux/of_address.h>
+#include <linux/slab.h>
+
+#include <dt-bindings/clock/sun4i-a10-pll2.h>
+
+#define SUN6I_A31_PLL2_ENABLE 31
+
+#define SUN6I_A31_PLL2_PRE_DIV_SHIFT 0
+#define SUN6I_A31_PLL2_PRE_DIV_WIDTH 5
+#define SUN6I_A31_PLL2_PRE_DIV_MASK GENMASK(SUN6I_A31_PLL2_PRE_DIV_WIDTH - 1, 0)
+
+#define SUN6I_A31_PLL2_N_SHIFT 8
+#define SUN6I_A31_PLL2_N_WIDTH 7
+#define SUN6I_A31_PLL2_N_MASK GENMASK(SUN6I_A31_PLL2_N_WIDTH - 1, 0)
+
+#define SUN6I_A31_PLL2_POST_DIV_SHIFT 16
+#define SUN6I_A31_PLL2_POST_DIV_WIDTH 4
+#define SUN6I_A31_PLL2_POST_DIV_MASK GENMASK(SUN6I_A31_PLL2_POST_DIV_WIDTH - 1, 0)
+
+#define SUN6I_A31_PLL2_POST_DIV_VALUE 4
+
+#define SUN6I_A31_PLL2_OUTPUTS 4
+
+static DEFINE_SPINLOCK(sun6i_a31_pll2_lock);
+
+static void __init sun6i_a31_pll2_setup(struct device_node *node)
+{
+ const char *clk_name = node->name, *parent;
+ struct clk **clks, *base_clk, *prediv_clk;
+ struct clk_onecell_data *clk_data;
+ struct clk_multiplier *mult;
+ struct clk_gate *gate;
+ void __iomem *reg;
+ u32 val;
+
+ reg = of_io_request_and_map(node, 0, of_node_full_name(node));
+ if (IS_ERR(reg))
+ return;
+
+ clk_data = kzalloc(sizeof(*clk_data), GFP_KERNEL);
+ if (!clk_data)
+ goto err_unmap;
+
+ clks = kcalloc(SUN6I_A31_PLL2_OUTPUTS, sizeof(struct clk *), GFP_KERNEL);
+ if (!clks)
+ goto err_free_data;
+
+ parent = of_clk_get_parent_name(node, 0);
+ prediv_clk = clk_register_divider(NULL, "pll2-prediv",
+ parent, 0, reg,
+ SUN6I_A31_PLL2_PRE_DIV_SHIFT,
+ SUN6I_A31_PLL2_PRE_DIV_WIDTH,
+ CLK_DIVIDER_ONE_BASED |
+ CLK_DIVIDER_ALLOW_ZERO,
+ &sun6i_a31_pll2_lock);
+ if (!prediv_clk) {
+ pr_err("Couldn't register the prediv clock\n");
+ goto err_free_array;
+ }
+
+ /* Setup the gate part of the PLL2 */
+ gate = kzalloc(sizeof(struct clk_gate), GFP_KERNEL);
+ if (!gate)
+ goto err_unregister_prediv;
+
+ gate->reg = reg;
+ gate->bit_idx = SUN6I_A31_PLL2_ENABLE;
+ gate->lock = &sun6i_a31_pll2_lock;
+
+ /* Setup the multiplier part of the PLL2 */
+ mult = kzalloc(sizeof(struct clk_multiplier), GFP_KERNEL);
+ if (!mult)
+ goto err_free_gate;
+
+ mult->reg = reg;
+ mult->shift = SUN6I_A31_PLL2_N_SHIFT;
+ mult->width = 7;
+ mult->flags = CLK_MULTIPLIER_ZERO_BYPASS |
+ CLK_MULTIPLIER_ROUND_CLOSEST;
+ mult->lock = &sun6i_a31_pll2_lock;
+
+ parent = __clk_get_name(prediv_clk);
+ base_clk = clk_register_composite(NULL, "pll2-base",
+ &parent, 1,
+ NULL, NULL,
+ &mult->hw, &clk_multiplier_ops,
+ &gate->hw, &clk_gate_ops,
+ CLK_SET_RATE_PARENT);
+ if (!base_clk) {
+ pr_err("Couldn't register the base multiplier clock\n");
+ goto err_free_multiplier;
+ }
+
+ parent = __clk_get_name(base_clk);
+
+ /*
+ * PLL2-1x
+ *
+ * This is supposed to have a post divider, but we won't need
+ * to use it, we just need to initialise it to 4, and use a
+ * fixed divider.
+ */
+ val = readl(reg);
+ val &= ~(SUN6I_A31_PLL2_POST_DIV_MASK << SUN6I_A31_PLL2_POST_DIV_SHIFT);
+ val |= (SUN6I_A31_PLL2_POST_DIV_VALUE - 1)
+ << SUN6I_A31_PLL2_POST_DIV_SHIFT;
+ writel(val, reg);
+
+ of_property_read_string_index(node, "clock-output-names",
+ SUN4I_A10_PLL2_1X, &clk_name);
+ clks[SUN4I_A10_PLL2_1X] = clk_register_fixed_factor(NULL, clk_name,
+ parent,
+ CLK_SET_RATE_PARENT,
+ 1,
+ SUN6I_A31_PLL2_POST_DIV_VALUE);
+ WARN_ON(IS_ERR(clks[SUN4I_A10_PLL2_1X]));
+
+ /*
+ * PLL2-2x
+ *
+ * This clock doesn't use the post divider, and really is just
+ * a fixed divider from the PLL2 base clock.
+ */
+ of_property_read_string_index(node, "clock-output-names",
+ SUN4I_A10_PLL2_2X, &clk_name);
+ clks[SUN4I_A10_PLL2_2X] = clk_register_fixed_factor(NULL, clk_name,
+ parent,
+ CLK_SET_RATE_PARENT,
+ 1, 2);
+ WARN_ON(IS_ERR(clks[SUN4I_A10_PLL2_2X]));
+
+ /* PLL2-4x */
+ of_property_read_string_index(node, "clock-output-names",
+ SUN4I_A10_PLL2_4X, &clk_name);
+ clks[SUN4I_A10_PLL2_4X] = clk_register_fixed_factor(NULL, clk_name,
+ parent,
+ CLK_SET_RATE_PARENT,
+ 1, 1);
+ WARN_ON(IS_ERR(clks[SUN4I_A10_PLL2_4X]));
+
+ /* PLL2-8x */
+ of_property_read_string_index(node, "clock-output-names",
+ SUN4I_A10_PLL2_8X, &clk_name);
+ clks[SUN4I_A10_PLL2_8X] = clk_register_fixed_factor(NULL, clk_name,
+ parent,
+ CLK_SET_RATE_PARENT,
+ 2, 1);
+ WARN_ON(IS_ERR(clks[SUN4I_A10_PLL2_8X]));
+
+ clk_data->clks = clks;
+ clk_data->clk_num = SUN6I_A31_PLL2_OUTPUTS;
+ of_clk_add_provider(node, of_clk_src_onecell_get, clk_data);
+
+ return;
+
+err_free_multiplier:
+ kfree(mult);
+err_free_gate:
+ kfree(gate);
+err_unregister_prediv:
+ clk_unregister_divider(prediv_clk);
+err_free_array:
+ kfree(clks);
+err_free_data:
+ kfree(clk_data);
+err_unmap:
+ iounmap(reg);
+}
+
+CLK_OF_DECLARE(sun6i_a31_pll2, "allwinner,sun6i-a31-pll2-clk",
+ sun6i_a31_pll2_setup);
--
2.9.0
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