diff options
Diffstat (limited to 'drivers/clk/at91/clk-slow.c')
-rw-r--r-- | drivers/clk/at91/clk-slow.c | 108 |
1 files changed, 108 insertions, 0 deletions
diff --git a/drivers/clk/at91/clk-slow.c b/drivers/clk/at91/clk-slow.c new file mode 100644 index 0000000000..d4981e7b4d --- /dev/null +++ b/drivers/clk/at91/clk-slow.c @@ -0,0 +1,108 @@ +/* + * drivers/clk/at91/clk-slow.c + * + * Copyright (C) 2013 Boris BREZILLON <b.brezillon@overkiz.com> + * + * 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. + * + */ + +#include <common.h> +#include <clock.h> +#include <of.h> +#include <io.h> +#include <linux/list.h> +#include <linux/clk.h> +#include <linux/clk/at91_pmc.h> +#include <mfd/syscon.h> +#include <regmap.h> + +#include "pmc.h" + +struct clk_sam9260_slow { + struct clk clk; + struct regmap *regmap; + const char *parent_names[2]; +}; + +#define to_clk_sam9260_slow(clk) container_of(clk, struct clk_sam9260_slow, clk) + +static int clk_sam9260_slow_get_parent(struct clk *clk) +{ + struct clk_sam9260_slow *slowck = to_clk_sam9260_slow(clk); + unsigned int status; + + regmap_read(slowck->regmap, AT91_PMC_SR, &status); + + return status & AT91_PMC_OSCSEL ? 1 : 0; +} + +static const struct clk_ops sam9260_slow_ops = { + .get_parent = clk_sam9260_slow_get_parent, +}; + +static struct clk * __init +at91_clk_register_sam9260_slow(struct regmap *regmap, + const char *name, + const char **parent_names, + int num_parents) +{ + struct clk_sam9260_slow *slowck; + int ret; + + if (!name) + return ERR_PTR(-EINVAL); + + if (!parent_names || !num_parents) + return ERR_PTR(-EINVAL); + + slowck = xzalloc(sizeof(*slowck)); + slowck->clk.name = name; + slowck->clk.ops = &sam9260_slow_ops; + memcpy(slowck->parent_names, parent_names, + num_parents * sizeof(slowck->parent_names[0])); + slowck->clk.parent_names = slowck->parent_names; + slowck->clk.num_parents = num_parents; + slowck->regmap = regmap; + + ret = clk_register(&slowck->clk); + if (ret) { + kfree(slowck); + return ERR_PTR(ret); + } + + return &slowck->clk; +} + +static int of_at91sam9260_clk_slow_setup(struct device_node *np) +{ + struct clk *clk; + const char *parent_names[2]; + unsigned int num_parents; + const char *name = np->name; + struct regmap *regmap; + + num_parents = of_clk_get_parent_count(np); + if (num_parents != 2) + return -EINVAL; + + of_clk_parent_fill(np, parent_names, num_parents); + regmap = syscon_node_to_regmap(of_get_parent(np)); + if (IS_ERR(regmap)) + return PTR_ERR(regmap); + + of_property_read_string(np, "clock-output-names", &name); + + clk = at91_clk_register_sam9260_slow(regmap, name, parent_names, + num_parents); + if (IS_ERR(clk)) + return PTR_ERR(clk); + + return of_clk_add_provider(np, of_clk_src_simple_get, clk); +} + +CLK_OF_DECLARE(at91sam9260_clk_slow, "atmel,at91sam9260-clk-slow", + of_at91sam9260_clk_slow_setup); |