Add support for clocks having their own register set. Signed-off-by: Alexandre Belloni <alexandre.bell...@free-electrons.com> --- drivers/clk/berlin/Makefile | 2 +- drivers/clk/berlin/clk.c | 132 ++++++++++++++++++++++++++++++++++++++++++++ 2 files changed, 133 insertions(+), 1 deletion(-) create mode 100644 drivers/clk/berlin/clk.c
diff --git a/drivers/clk/berlin/Makefile b/drivers/clk/berlin/Makefile index 94859513de90..9bfa58eaf25a 100644 --- a/drivers/clk/berlin/Makefile +++ b/drivers/clk/berlin/Makefile @@ -1,4 +1,4 @@ -obj-y += pll.o +obj-y += pll.o clk.o obj-$(CONFIG_MACH_BERLIN_BG2) += pll-berlin2.o obj-$(CONFIG_MACH_BERLIN_BG2CD) += pll-berlin2.o obj-$(CONFIG_MACH_BERLIN_BG2Q) += pll-berlin2q.o diff --git a/drivers/clk/berlin/clk.c b/drivers/clk/berlin/clk.c new file mode 100644 index 000000000000..a0e688e5bead --- /dev/null +++ b/drivers/clk/berlin/clk.c @@ -0,0 +1,132 @@ +/* + * Copyright (c) 2014 Marvell Technology Group Ltd. + * + * This program is free software; you can redistribute it and/or modify it + * under the terms and conditions of the GNU General Public License, + * version 2, as published by the Free Software Foundation. + * + * This program is distributed in the hope 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. + * + * You should have received a copy of the GNU General Public License along with + * this program. If not, see <http://www.gnu.org/licenses/>. + */ +#include <linux/bitops.h> +#include <linux/clk-provider.h> +#include <linux/of.h> +#include <linux/of_address.h> +#include <linux/slab.h> + +#include "common.h" + +#define CLKEN (1 << 0) +#define CLKPLLSEL_MASK 7 +#define CLKPLLSEL_SHIFT 1 +#define CLKPLLSWITCH (1 << 4) +#define CLKSWITCH (1 << 5) +#define CLKD3SWITCH (1 << 6) +#define CLKSEL_MASK 7 +#define CLKSEL_SHIFT 7 + +struct berlin_clk { + struct clk_hw hw; + void __iomem *base; +}; + +#define to_berlin_clk(hw) container_of(hw, struct berlin_clk, hw) + +static u8 clk_div[] = {1, 2, 4, 6, 8, 12, 1, 1}; + +static unsigned long berlin_clk_recalc_rate(struct clk_hw *hw, + unsigned long parent_rate) +{ + u32 val, divider; + struct berlin_clk *clk = to_berlin_clk(hw); + + val = readl_relaxed(clk->base); + if (val & CLKD3SWITCH) + divider = 3; + else { + if (val & CLKSWITCH) { + val >>= CLKSEL_SHIFT; + val &= CLKSEL_MASK; + divider = clk_div[val]; + } else + divider = 1; + } + + return parent_rate / divider; +} + +static u8 berlin_clk_get_parent(struct clk_hw *hw) +{ + u32 val; + struct berlin_clk *clk = to_berlin_clk(hw); + + val = readl_relaxed(clk->base); + if (val & CLKPLLSWITCH) { + val >>= CLKPLLSEL_SHIFT; + val &= CLKPLLSEL_MASK; + return val; + } + + return 0; +} + +static const struct clk_ops berlin_clk_ops = { + .recalc_rate = berlin_clk_recalc_rate, + .get_parent = berlin_clk_get_parent, +}; + +static void __init berlin_clk_setup(struct device_node *np) +{ + struct clk_init_data init; + struct berlin_clk *bclk; + struct clk *clk; + const char **parent_names; + int nparents, i, ret; + + bclk = kzalloc(sizeof(*bclk), GFP_KERNEL); + if (WARN_ON(!bclk)) + return; + + bclk->base = of_iomap(np, 0); + if (WARN_ON(!bclk->base)) + goto exit; + + nparents = of_clk_get_parent_count(np); + if (WARN_ON(!nparents)) + goto exit; + + parent_names = kzalloc((sizeof(char *) * nparents), GFP_KERNEL); + if (WARN_ON(!parent_names)) + goto exit; + + init.name = np->name; + init.ops = &berlin_clk_ops; + for (i = 0; i < nparents; i++) { + parent_names[i] = of_clk_get_parent_name(np, i); + if (!parent_names[i]) + break; + } + init.parent_names = parent_names; + init.num_parents = i; + + bclk->hw.init = &init; + + clk = clk_register(NULL, &bclk->hw); + kfree(parent_names); + if (WARN_ON(IS_ERR(clk))) + goto exit; + + ret = of_clk_add_provider(np, of_clk_src_simple_get, clk); + WARN_ON(ret); + + return; +exit: + kfree(bclk); +} + +CLK_OF_DECLARE(berlin_clk, "marvell,berlin-clk", berlin_clk_setup); -- 1.9.1 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
