[PATCH 4/7] clk: add clk-asm9260 driver

[Alexandre Belloni]

Hi,

Please have a look at https://lkml.org/lkml/2014/5/14/598 which describe
the preferred way of implementing clocks in the CCF where you only
declare the clock generator in the DT instead of each separate clocks.

On 14/09/2014 at 00:13:25 +0200, Oleksij Rempel wrote :
> Signed-off-by: Oleksij Rempel <linux at rempel-privat.de>
> ---
>  drivers/clk/Makefile      |   1 +
>  drivers/clk/clk-asm9260.c | 159 ++++++++++++++++++++++++++++++++++++++++++++++
>  2 files changed, 160 insertions(+)
>  create mode 100644 drivers/clk/clk-asm9260.c
> 
> diff --git a/drivers/clk/Makefile b/drivers/clk/Makefile
> index 567f102..351dd48 100644
> --- a/drivers/clk/Makefile
> +++ b/drivers/clk/Makefile
> @@ -38,6 +38,7 @@ obj-$(CONFIG_ARCH_HI3xxx)		+= hisilicon/
>  obj-$(CONFIG_ARCH_HIP04)		+= hisilicon/
>  obj-$(CONFIG_ARCH_HIX5HD2)		+= hisilicon/
>  obj-$(CONFIG_COMMON_CLK_KEYSTONE)	+= keystone/
> +obj-$(CONFIG_MACH_ASM9260)		+= clk-asm9260.o
>  ifeq ($(CONFIG_COMMON_CLK), y)
>  obj-$(CONFIG_ARCH_MMP)			+= mmp/
>  endif
> diff --git a/drivers/clk/clk-asm9260.c b/drivers/clk/clk-asm9260.c
> new file mode 100644
> index 0000000..396cc09
> --- /dev/null
> +++ b/drivers/clk/clk-asm9260.c
> @@ -0,0 +1,159 @@
> +/*
> + * U300 clock implementation
> + * Copyright (C) 2007-2012 ST-Ericsson AB
> + * License terms: GNU General Public License (GPL) version 2
> + * Author: Linus Walleij <linus.walleij at stericsson.com>
> + * Author: Jonas Aaberg <jonas.aberg at stericsson.com>
> + */
> +#include <linux/clk.h>
> +#include <linux/clkdev.h>
> +#include <linux/err.h>
> +#include <linux/io.h>
> +#include <linux/clk-provider.h>
> +#include <linux/spinlock.h>
> +#include <linux/of.h>
> +#include <linux/of_address.h>
> +
> +static DEFINE_SPINLOCK(asm9260_clk_lock);
> +
> +struct asm9260_clk {
> +	void __iomem    *reg;
> +	char *parent_name;
> +};
> +
> +static void __iomem *asm9260_get_sreg(struct device_node *node)
> +{
> +	u32 reg;
> +	void __iomem *iomem;
> +	struct device_node *srnp;
> +	int ret;
> +
> +	ret = of_property_read_u32(node, "reg", &reg);
> +	if (WARN_ON(ret))
> +		return NULL;
> +
> +	srnp = of_find_compatible_node(NULL, NULL, "alpscale,asm9260-sregs");
> +	iomem = of_iomap(srnp, 0);
> +	iomem += reg;
> +
> +	return iomem;
> +}
> +
> +/*
> + * On this chip gate used to disable or to update clock
> + * after new source was selected
> + */
> +
> +static void __init asm9260_gate_init(struct device_node *node)
> +{
> +	struct clk *clk;
> +	const char *clk_name = node->name;
> +	void __iomem *iomem;
> +	const char *parent_name;
> +	u32 bit;
> +	int ret;
> +
> +	iomem = asm9260_get_sreg(node);
> +	parent_name = of_clk_get_parent_name(node, 0);
> +
> +	ret = of_property_read_u32(node, "bit-index", &bit);
> +	if (WARN_ON(ret))
> +		return;
> +
> +	clk = clk_register_gate(NULL, clk_name, parent_name,
> +			CLK_SET_RATE_PARENT, iomem, bit, 0,
> +			&asm9260_clk_lock);
> +
> +	if (!IS_ERR(clk))
> +		of_clk_add_provider(node, of_clk_src_simple_get, clk);
> +}
> +CLK_OF_DECLARE(asm9260_gate, "alpscale,asm9260-gate-clock", asm9260_gate_init);
> +
> +
> +static void __init asm9260_div_init(struct device_node *node)
> +{
> +	struct clk *clk;
> +	const char *clk_name = node->name;
> +	void __iomem *iomem;
> +	const char *parent_name;
> +
> +	iomem = asm9260_get_sreg(node);
> +
> +	parent_name = of_clk_get_parent_name(node, 0);
> +	clk = clk_register_divider(NULL, clk_name, parent_name,
> +			CLK_SET_RATE_PARENT, iomem, 0, 8, CLK_DIVIDER_ONE_BASED,
> +			&asm9260_clk_lock);
> +
> +	if (!IS_ERR(clk))
> +		of_clk_add_provider(node, of_clk_src_simple_get, clk);
> +}
> +CLK_OF_DECLARE(asm9260_div, "alpscale,asm9260-div-clock", asm9260_div_init);
> +
> +/*
> + * Simple one bit MUX for two sources
> + */
> +static void __init asm9260_bimux_init(struct device_node *node)
> +{
> +	struct clk *clk;
> +	const char *clk_name = node->name;
> +	u8 num_parents;
> +	void __iomem *iomem;
> +	const char **parent_names;
> +	int ret, i;
> +	u32 *table;
> +
> +	iomem = asm9260_get_sreg(node);
> +	if (!iomem)
> +		return;
> +
> +	num_parents = of_clk_get_parent_count(node);
> +	if (WARN_ON(!num_parents || num_parents > 2))
> +		return;
> +
> +	parent_names = kzalloc(sizeof(char *) * num_parents, GFP_KERNEL);
> +	if (WARN_ON(!parent_names))
> +		return;
> +
> +	table = kzalloc(sizeof(u32) * num_parents, GFP_KERNEL);
> +	if (WARN_ON(!table))
> +		return;
> +
> +	ret = of_property_read_u32_array(node, "mux-table", table,
> +			num_parents);
> +	if (WARN_ON(ret))
> +		return;
> +
> +	for (i = 0; i < num_parents; i++)
> +		parent_names[i] = of_clk_get_parent_name(node, i);
> +
> +	clk = clk_register_mux_table(NULL, clk_name, parent_names,
> +			num_parents, 0, iomem, 0, 1, 0, table,
> +			&asm9260_clk_lock);
> +
> +	if (!IS_ERR(clk))
> +		of_clk_add_provider(node, of_clk_src_simple_get, clk);
> +}
> +CLK_OF_DECLARE(asm9260_bimux, "alpscale,asm9260-bimux-clock", asm9260_bimux_init);
> +
> +static void __init asm9260_pll_init(struct device_node *node)
> +{
> +	struct clk *clk;
> +	const char *clk_name = node->name;
> +	u32 rate;
> +	void __iomem *iomem;
> +	const char *parent_name;
> +	u32 accuracy = 0;
> +
> +	iomem = asm9260_get_sreg(node);
> +	rate = (ioread32(iomem) & 0xffff) * 1000000;
> +
> +	parent_name = of_clk_get_parent_name(node, 0);
> +	accuracy = clk_get_accuracy(__clk_lookup(parent_name));
> +	clk = clk_register_fixed_rate_with_accuracy(NULL, clk_name, parent_name,
> +			0, rate,
> +			accuracy);
> +
> +	if (!IS_ERR(clk))
> +		of_clk_add_provider(node, of_clk_src_simple_get, clk);
> +}
> +CLK_OF_DECLARE(asm9260_pll, "alpscale,asm9260-pll-clock", asm9260_pll_init);
> -- 
> 1.9.1
> 
> 
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-- 
Alexandre Belloni, Free Electrons
Embedded Linux, Kernel and Android engineering
http://free-electrons.com