Signed-off-by: Sascha Hauer <[email protected]> --- drivers/clk/Makefile | 3 +- drivers/clk/clk-gate.c | 78 ++++++++++++++++++++++++++++++++++++++++++++++++ include/linux/clk.h | 2 ++ 3 files changed, 82 insertions(+), 1 deletion(-) create mode 100644 drivers/clk/clk-gate.c
diff --git a/drivers/clk/Makefile b/drivers/clk/Makefile index 39a75a4..3cc7163 100644 --- a/drivers/clk/Makefile +++ b/drivers/clk/Makefile @@ -1,2 +1,3 @@ -obj-$(CONFIG_COMMON_CLK) += clk.o clk-fixed.o clk-divider.o clk-fixed-factor.o clk-mux.o +obj-$(CONFIG_COMMON_CLK) += clk.o clk-fixed.o clk-divider.o clk-fixed-factor.o \ + clk-mux.o clk-gate.o obj-$(CONFIG_CLKDEV_LOOKUP) += clkdev.o diff --git a/drivers/clk/clk-gate.c b/drivers/clk/clk-gate.c new file mode 100644 index 0000000..cf1bb1a --- /dev/null +++ b/drivers/clk/clk-gate.c @@ -0,0 +1,78 @@ +/* + * clk-gate.c - generic barebox clock support. Based on Linux clk support + * + * Copyright (c) 2012 Sascha Hauer <[email protected]>, Pengutronix + * + * 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 <common.h> +#include <io.h> +#include <malloc.h> +#include <linux/clk.h> +#include <linux/err.h> + +struct clk_gate { + struct clk clk; + void __iomem *reg; + int shift; + const char *parent; +}; + +static int clk_gate_enable(struct clk *clk) +{ + struct clk_gate *g = container_of(clk, struct clk_gate, clk); + u32 val; + + val = readl(g->reg); + val |= 1 << g->shift; + writel(val, g->reg); + + return 0; +} + +static void clk_gate_disable(struct clk *clk) +{ + struct clk_gate *g = container_of(clk, struct clk_gate, clk); + u32 val; + + val = readl(g->reg); + val &= ~(1 << g->shift); + writel(val, g->reg); +} + +struct clk_ops clk_gate_ops = { + .enable = clk_gate_enable, + .disable = clk_gate_disable, +}; + +struct clk *clk_gate(const char *name, const char *parent, void __iomem *reg, + u8 shift) +{ + struct clk_gate *g = xzalloc(sizeof(*g)); + int ret; + + g->parent = parent; + g->reg = reg; + g->shift = shift; + g->clk.ops = &clk_gate_ops; + g->clk.name = name; + g->clk.parent_names = &g->parent; + g->clk.num_parents = 1; + + ret = clk_register(&g->clk); + if (ret) { + free(g); + return ERR_PTR(ret); + } + + return &g->clk; +} diff --git a/include/linux/clk.h b/include/linux/clk.h index e9031dd..00588bf 100644 --- a/include/linux/clk.h +++ b/include/linux/clk.h @@ -188,6 +188,8 @@ struct clk *clk_fixed_factor(const char *name, const char *parent, unsigned int mult, unsigned int div); struct clk *clk_mux(const char *name, void __iomem *reg, u8 shift, u8 width, const char **parents, u8 num_parents); +struct clk *clk_gate(const char *name, const char *parent, void __iomem *reg, + u8 shift); int clk_register(struct clk *clk); -- 1.7.10.4 _______________________________________________ barebox mailing list [email protected] http://lists.infradead.org/mailman/listinfo/barebox
