[PATCH v2 1/2] clk: sunxi: Add sun6i/8i video support
Jean-Francois Moine
moinejf at free.fr
Fri Jan 15 07:41:29 PST 2016
Add the clock types which are used by the sun6i/8i families for video.
Signed-off-by: Jean-Francois Moine <moinejf at free.fr>
---
Changes:
- remarks from Chen-Yu Tsai
- DT documentation added
---
Documentation/devicetree/bindings/clock/sunxi.txt | 2 +
drivers/clk/sunxi/clk-sun6i-display.c | 106 +++++++++++++
drivers/clk/sunxi/clk-sun6i-pll3.c | 174 ++++++++++++++++++++++
3 files changed, 282 insertions(+)
create mode 100644 drivers/clk/sunxi/clk-sun6i-display.c
create mode 100644 drivers/clk/sunxi/clk-sun6i-pll3.c
diff --git a/Documentation/devicetree/bindings/clock/sunxi.txt b/Documentation/devicetree/bindings/clock/sunxi.txt
index 8a47b77..c57dd0e 100644
--- a/Documentation/devicetree/bindings/clock/sunxi.txt
+++ b/Documentation/devicetree/bindings/clock/sunxi.txt
@@ -11,6 +11,7 @@ Required properties:
"allwinner,sun6i-a31-pll1-clk" - for the main PLL clock on A31
"allwinner,sun8i-a23-pll1-clk" - for the main PLL clock on A23
"allwinner,sun9i-a80-pll4-clk" - for the peripheral PLLs on A80
+ "allwinner,sun6i-pll3-clk" - for the video PLLs clock
"allwinner,sun4i-a10-pll5-clk" - for the PLL5 clock
"allwinner,sun4i-a10-pll6-clk" - for the PLL6 clock
"allwinner,sun6i-a31-pll6-clk" - for the PLL6 clock on A31
@@ -70,6 +71,7 @@ Required properties:
"allwinner,sun8i-a23-usb-clk" - for usb gates + resets on A23
"allwinner,sun9i-a80-usb-mod-clk" - for usb gates + resets on A80
"allwinner,sun9i-a80-usb-phy-clk" - for usb phy gates + resets on A80
+ "allwinner,sun6i-display-clk" - for the display clocks
Required properties for all clocks:
- reg : shall be the control register address for the clock.
diff --git a/drivers/clk/sunxi/clk-sun6i-display.c b/drivers/clk/sunxi/clk-sun6i-display.c
new file mode 100644
index 0000000..48356e3
--- /dev/null
+++ b/drivers/clk/sunxi/clk-sun6i-display.c
@@ -0,0 +1,106 @@
+/*
+ * Copyright 2016 Jean-Francois Moine <moinejf at free.fr>
+ *
+ * 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/slab.h>
+#include <linux/spinlock.h>
+#include <linux/rational.h>
+#include <linux/delay.h>
+
+static DEFINE_SPINLOCK(sun6i_display_lock);
+
+#define SUN6I_DISPLAY_GATE_BIT 31
+#define SUN6I_DISPLAY_SEL_SHIFT 24
+#define SUN6I_DISPLAY_SEL_MASK GENMASK(2, 0)
+#define SUN6I_DISPLAY_MSHIFT 0
+#define SUN6I_DISPLAY_MWIDTH 4
+
+static void __init sun6i_display_setup(struct device_node *node)
+{
+ const char *clk_name = node->name;
+ const char *parents[8];
+ struct clk_mux *mux = NULL;
+ struct clk_divider *div;
+ struct clk_gate *gate;
+ struct resource res;
+ void __iomem *mmio;
+ struct clk *clk;
+ int n;
+
+ of_property_read_string(node, "clock-output-names", &clk_name);
+
+ mmio = of_io_request_and_map(node, 0, of_node_full_name(node));
+ if (IS_ERR(mmio)) {
+ pr_err("%s: Could not map the clock registers\n", clk_name);
+ return;
+ }
+
+ n = of_clk_parent_fill(node, parents, ARRAY_SIZE(parents));
+
+ if (n > 1) { /* many possible sources */
+ mux = kzalloc(sizeof(*mux), GFP_KERNEL);
+ if (!mux)
+ goto free_io;
+ mux->reg = mmio;
+ mux->shift = SUN6I_DISPLAY_SEL_SHIFT;
+ mux->mask = SUN6I_DISPLAY_SEL_MASK;
+ mux->lock = &sun6i_display_lock;
+ }
+
+ gate = kzalloc(sizeof(*gate), GFP_KERNEL);
+ if (!gate)
+ goto free_mux;
+
+ gate->reg = mmio;
+ gate->bit_idx = SUN6I_DISPLAY_GATE_BIT;
+ gate->lock = &sun6i_display_lock;
+
+ div = kzalloc(sizeof(*div), GFP_KERNEL);
+ if (!div)
+ goto free_gate;
+
+ div->reg = mmio;
+ div->shift = SUN6I_DISPLAY_MSHIFT;
+ div->width = SUN6I_DISPLAY_MWIDTH;
+ div->lock = &sun6i_display_lock;
+
+ clk = clk_register_composite(NULL, clk_name,
+ parents, n,
+ mux ? &mux->hw : NULL, &clk_mux_ops,
+ &div->hw, &clk_divider_ops,
+ &gate->hw, &clk_gate_ops,
+ 0);
+ if (IS_ERR(clk)) {
+ pr_err("%s: Couldn't register the clock\n", clk_name);
+ goto free_div;
+ }
+
+ of_clk_add_provider(node, of_clk_src_simple_get, clk);
+
+ return;
+
+free_div:
+ kfree(div);
+free_gate:
+ kfree(gate);
+free_mux:
+ kfree(mux);
+free_io:
+ iounmap(mmio);
+ of_address_to_resource(node, 0, &res);
+ release_mem_region(res.start, resource_size(&res));
+}
+
+CLK_OF_DECLARE(sun6i_display, "allwinner,sun6i-display-clk", sun6i_display_setup);
diff --git a/drivers/clk/sunxi/clk-sun6i-pll3.c b/drivers/clk/sunxi/clk-sun6i-pll3.c
new file mode 100644
index 0000000..3c128a4
--- /dev/null
+++ b/drivers/clk/sunxi/clk-sun6i-pll3.c
@@ -0,0 +1,174 @@
+/*
+ * Allwinner video PLL clocks
+ *
+ * Copyright 2016 Jean-Francois Moine <moinejf at free.fr>
+ *
+ * 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/slab.h>
+#include <linux/spinlock.h>
+#include <linux/rational.h>
+#include <linux/iopoll.h>
+
+static DEFINE_SPINLOCK(sun6i_pll3_lock);
+
+struct clk_fact {
+ struct clk_hw hw;
+ void __iomem *reg;
+};
+#define to_clk_fact(_hw) container_of(_hw, struct clk_fact, hw)
+
+#define SUN6I_PLL3_MSHIFT 0
+#define SUN6I_PLL3_MMASK GENMASK(3, 0)
+#define SUN6I_PLL3_NSHIFT 8
+#define SUN6I_PLL3_NMASK GENMASK(7, 0)
+#define SUN6I_PLL3_MODE_SEL BIT(24)
+#define SUN6I_PLL3_FRAC_CLK BIT(25)
+#define SUN6I_PLL3_LOCK_BIT 28
+#define SUN6I_PLL3_GATE_BIT 31
+
+static u32 sun6i_pll3_get_fact(unsigned long rate,
+ unsigned long parent_rate,
+ unsigned long *n, unsigned long *m)
+{
+ if (rate == 297000000)
+ return SUN6I_PLL3_FRAC_CLK;
+ if (rate == 270000000)
+ return 0;
+ rational_best_approximation(rate, parent_rate,
+ SUN6I_PLL3_NMASK + 1, SUN6I_PLL3_MMASK + 1,
+ n, m);
+ return SUN6I_PLL3_MODE_SEL;
+}
+
+static unsigned long sun6i_pll3_recalc_rate(struct clk_hw *hw,
+ unsigned long parent_rate)
+{
+ struct clk_fact *fact = to_clk_fact(hw);
+ u32 reg;
+ u32 n, m;
+
+ reg = readl(fact->reg);
+ if (reg & SUN6I_PLL3_MODE_SEL) {
+ n = (reg >> SUN6I_PLL3_NSHIFT) & SUN6I_PLL3_NMASK;
+ m = (reg >> SUN6I_PLL3_MSHIFT) & SUN6I_PLL3_MMASK;
+ return parent_rate / (m + 1) * (n + 1);
+ }
+ if (reg & SUN6I_PLL3_FRAC_CLK)
+ return 297000000;
+ return 270000000;
+}
+
+static long sun6i_pll3_round_rate(struct clk_hw *hw, unsigned long rate,
+ unsigned long *parent_rate)
+{
+ u32 frac;
+ unsigned long n, m;
+
+ frac = sun6i_pll3_get_fact(rate, *parent_rate, &n, &m);
+ if (frac & SUN6I_PLL3_MODE_SEL)
+ return *parent_rate / m * n;
+ if (frac & SUN6I_PLL3_FRAC_CLK)
+ return 297000000;
+ return 270000000;
+}
+
+static int sun6i_pll3_set_rate(struct clk_hw *hw, unsigned long rate,
+ unsigned long parent_rate)
+{
+ struct clk_fact *fact = to_clk_fact(hw);
+ u32 reg;
+ unsigned long n, m;
+
+ reg = readl(fact->reg) &
+ ~(SUN6I_PLL3_MODE_SEL |
+ SUN6I_PLL3_FRAC_CLK |
+ (SUN6I_PLL3_NMASK << SUN6I_PLL3_NSHIFT) |
+ (SUN6I_PLL3_MMASK << SUN6I_PLL3_MSHIFT));
+
+ reg |= sun6i_pll3_get_fact(rate, parent_rate, &n, &m);
+ if (reg & SUN6I_PLL3_MODE_SEL)
+ reg |= ((n - 1) << SUN6I_PLL3_NSHIFT) |
+ ((m - 1) << SUN6I_PLL3_MSHIFT);
+
+ writel(reg, fact->reg);
+
+ readl_poll_timeout(fact->reg, reg, reg & SUN6I_PLL3_LOCK_BIT, 10, 500);
+
+ return 0;
+}
+
+static const struct clk_ops clk_sun6i_pll3_fact_ops = {
+ .recalc_rate = sun6i_pll3_recalc_rate,
+ .round_rate = sun6i_pll3_round_rate,
+ .set_rate = sun6i_pll3_set_rate,
+};
+
+static void __init sun6i_pll3_setup(struct device_node *node)
+{
+ const char *clk_name, *parent;
+ void __iomem *mmio;
+ struct clk_fact *fact;
+ struct clk_gate *gate;
+ struct resource res;
+ struct clk *clk;
+
+ mmio = of_io_request_and_map(node, 0, of_node_full_name(node));
+ if (IS_ERR(mmio)) {
+ pr_err("%s: Could not map the clock registers\n", clk_name);
+ return;
+ }
+
+ gate = kzalloc(sizeof(*gate), GFP_KERNEL);
+ if (!gate)
+ goto free_mmio;
+ gate->reg = mmio;
+ gate->bit_idx = SUN6I_PLL3_GATE_BIT;
+ gate->lock = &sun6i_pll3_lock;
+
+ fact = kzalloc(sizeof(*fact), GFP_KERNEL);
+ if (!fact)
+ goto free_gate;
+ fact->reg = mmio;
+
+ parent = of_clk_get_parent_name(node, 0);
+
+ of_property_read_string(node, "clock-output-names", &clk_name);
+
+ clk = clk_register_composite(NULL, clk_name,
+ &parent, 1,
+ NULL, NULL,
+ &fact->hw, &clk_sun6i_pll3_fact_ops,
+ &gate->hw, &clk_gate_ops,
+ 0);
+ if (IS_ERR(clk)) {
+ pr_err("%s: Couldn't register the clock\n", clk_name);
+ goto free_fact;
+ }
+
+ of_clk_add_provider(node, of_clk_src_simple_get, clk);
+
+ return;
+
+free_fact:
+ kfree(fact);
+free_gate:
+ kfree(gate);
+free_mmio:
+ iounmap(mmio);
+ of_address_to_resource(node, 0, &res);
+ release_mem_region(res.start, resource_size(&res));
+}
+
+CLK_OF_DECLARE(sun6i_pll3, "allwinner,sun6i-pll3-clk", sun6i_pll3_setup);
--
2.7.0
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