Add pll driver for Marvell SoCs newer than BG2, BG2CD, BG2Q. Signed-off-by: Jisheng Zhang <jszhang@xxxxxxxxxxx> --- drivers/clk/berlin/Makefile | 2 +- drivers/clk/berlin/pll.c | 119 ++++++++++++++++++++++++++++++++++++++++++++ 2 files changed, 120 insertions(+), 1 deletion(-) create mode 100644 drivers/clk/berlin/pll.c diff --git a/drivers/clk/berlin/Makefile b/drivers/clk/berlin/Makefile index 2a36ab7..747700d 100644 --- a/drivers/clk/berlin/Makefile +++ b/drivers/clk/berlin/Makefile @@ -1,4 +1,4 @@ -obj-y += berlin2-avpll.o berlin2-pll.o berlin2-div.o +obj-y += pll.o berlin2-avpll.o berlin2-pll.o berlin2-div.o obj-$(CONFIG_MACH_BERLIN_BG2) += bg2.o obj-$(CONFIG_MACH_BERLIN_BG2CD) += bg2.o obj-$(CONFIG_MACH_BERLIN_BG2Q) += bg2q.o diff --git a/drivers/clk/berlin/pll.c b/drivers/clk/berlin/pll.c new file mode 100644 index 0000000..9aad0b6 --- /dev/null +++ b/drivers/clk/berlin/pll.c @@ -0,0 +1,119 @@ +/* + * Copyright (c) 2015 Marvell Technology Group Ltd. + * + * Author: Jisheng Zhang <jszhang@xxxxxxxxxxx> + * + * 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/io.h> +#include <linux/of.h> +#include <linux/of_address.h> +#include <linux/slab.h> +#include <linux/kernel.h> +#include <linux/clk-provider.h> + +#define PLL_CTRL0 0x0 +#define PLL_CTRL1 0x4 +#define PLL_CTRL2 0x8 +#define PLL_CTRL3 0xC +#define PLL_CTRL4 0x10 +#define PLL_STATUS 0x14 + +#define PLL_SOURCE_MAX 2 + +struct berlin_pll { + struct clk_hw hw; + void __iomem *ctrl; + void __iomem *bypass; + u8 bypass_shift; +}; + +#define to_berlin_pll(hw) container_of(hw, struct berlin_pll, hw) + +static u8 vcodiv_berlin[] = {1, 2, 4, 8, 16, 32, 64, 128}; + +static unsigned long berlin_pll_recalc_rate(struct clk_hw *hw, + unsigned long parent_rate) +{ + u32 val, fbdiv, rfdiv, vcodivsel, bypass; + struct berlin_pll *pll = to_berlin_pll(hw); + + bypass = readl_relaxed(pll->bypass); + if (bypass & (1 << pll->bypass_shift)) + return parent_rate; + + val = readl_relaxed(pll->ctrl + PLL_CTRL0); + fbdiv = (val >> 12) & 0x1FF; + rfdiv = (val >> 3) & 0x1FF; + val = readl_relaxed(pll->ctrl + PLL_CTRL1); + vcodivsel = (val >> 9) & 0x7; + return parent_rate * fbdiv * 4 / rfdiv / + vcodiv_berlin[vcodivsel]; +} + +static u8 berlin_pll_get_parent(struct clk_hw *hw) +{ + struct berlin_pll *pll = to_berlin_pll(hw); + u32 bypass = readl_relaxed(pll->bypass); + + if (bypass & (1 << pll->bypass_shift)) + return 1; + else + return 0; +} + +static const struct clk_ops berlin_pll_ops = { + .recalc_rate = berlin_pll_recalc_rate, + .get_parent = berlin_pll_get_parent, +}; + +void __init berlin_pll_setup(struct device_node *np) +{ + struct clk_init_data init; + struct berlin_pll *pll; + const char *parent_names[PLL_SOURCE_MAX]; + struct clk *clk; + int ret, num_parents; + + num_parents = of_clk_get_parent_count(np); + if (num_parents <= 0 || num_parents > PLL_SOURCE_MAX) + return; + + of_clk_parent_fill(np, parent_names, num_parents); + + pll = kzalloc(sizeof(*pll), GFP_KERNEL); + if (WARN_ON(!pll)) + return; + + pll->ctrl = of_iomap(np, 0); + pll->bypass = of_iomap(np, 1); + ret = of_property_read_u8(np, "bypass-shift", &pll->bypass_shift); + if (WARN_ON(!pll->ctrl || !pll->bypass || ret)) + return; + + init.name = np->name; + init.ops = &berlin_pll_ops; + init.parent_names = parent_names; + init.num_parents = num_parents; + + pll->hw.init = &init; + + clk = clk_register(NULL, &pll->hw); + if (WARN_ON(IS_ERR(clk))) + return; + + ret = of_clk_add_provider(np, of_clk_src_simple_get, clk); + if (WARN_ON(ret)) + return; +} +CLK_OF_DECLARE(berlin_pll, "marvell,berlin-pll", berlin_pll_setup); -- 2.5.3 -- To unsubscribe from this list: send the line "unsubscribe devicetree" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
