[PATCH v4 1/2] clk: sunxi: Add sun6i/8i video support
Maxime Ripard
maxime.ripard at free-electrons.com
Fri Feb 5 09:39:15 UTC 2016
Hi,
On Tue, Feb 02, 2016 at 06:35:10PM +0100, Jean-Francois Moine wrote:
> Add the clock types which are used by the sun6i/8i families for video.
>
> Signed-off-by: Jean-Francois Moine <moinejf at free.fr>
> ---
> v4:
> - drivers/clk/sunxi/Makefile was missing (Emil Velikov)
> v3: (no change)
> v2:
> - remarks from Chen-Yu Tsai
> - DT documentation added
> ---
> Documentation/devicetree/bindings/clock/sunxi.txt | 2 +
> drivers/clk/sunxi/Makefile | 2 +
> drivers/clk/sunxi/clk-sun6i-display.c | 106 +++++++++++++
> drivers/clk/sunxi/clk-sun6i-pll3.c | 174 ++++++++++++++++++++++
> 4 files changed, 284 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 e59f57b..a22b92f 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
sun6i-a31
> "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
> @@ -77,6 +78,7 @@ Required properties:
> "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,sun4i-a10-ve-clk" - for the Video Engine clock
> + "allwinner,sun6i-display-clk" - for the display clocks
Ditto
> Required properties for all clocks:
> - reg : shall be the control register address for the clock.
> diff --git a/drivers/clk/sunxi/Makefile b/drivers/clk/sunxi/Makefile
> index 3fd7901..6fe336f 100644
> --- a/drivers/clk/sunxi/Makefile
> +++ b/drivers/clk/sunxi/Makefile
> @@ -11,6 +11,8 @@ obj-y += clk-a10-ve.o
> obj-y += clk-a20-gmac.o
> obj-y += clk-mod0.o
> obj-y += clk-simple-gates.o
> +obj-y += clk-sun6i-display.o
> +obj-y += clk-sun6i-pll3.o
> obj-y += clk-sun8i-bus-gates.o
> obj-y += clk-sun8i-mbus.o
> obj-y += clk-sun9i-core.o
> 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);
Please use the display driver from my DRM serie, it covers everything
you need here.
> 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);
And please use the clk-factors code here.
Maxime
--
Maxime Ripard, Free Electrons
Embedded Linux, Kernel and Android engineering
http://free-electrons.com
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