This drivers allows to provide DT clocks for the cpu and system PLLs found on Marvell Berlin SoCs. Signed-off-by: Alexandre Belloni <alexandre.belloni@xxxxxxxxxxxxxxxxxx> --- Changes in v3: - removed empty lines a the end of the files - vcodiv are now arrays filled with zeros by default - use an u64 temporary variable to calculate the rate - warn when refdiv or vcodiv are zero --- drivers/clk/Makefile | 1 + drivers/clk/berlin/Makefile | 4 ++ drivers/clk/berlin/common.h | 35 ++++++++++++ drivers/clk/berlin/pll-berlin2.c | 40 +++++++++++++ drivers/clk/berlin/pll-berlin2q.c | 40 +++++++++++++ drivers/clk/berlin/pll.c | 114 ++++++++++++++++++++++++++++++++++++++ 6 files changed, 234 insertions(+) create mode 100644 drivers/clk/berlin/Makefile create mode 100644 drivers/clk/berlin/common.h create mode 100644 drivers/clk/berlin/pll-berlin2.c create mode 100644 drivers/clk/berlin/pll-berlin2q.c create mode 100644 drivers/clk/berlin/pll.c diff --git a/drivers/clk/Makefile b/drivers/clk/Makefile index a367a9831717..4a2602737c27 100644 --- a/drivers/clk/Makefile +++ b/drivers/clk/Makefile @@ -29,6 +29,7 @@ obj-$(CONFIG_ARCH_VT8500) += clk-vt8500.o obj-$(CONFIG_COMMON_CLK_WM831X) += clk-wm831x.o obj-$(CONFIG_COMMON_CLK_XGENE) += clk-xgene.o obj-$(CONFIG_COMMON_CLK_AT91) += at91/ +obj-$(CONFIG_ARCH_BERLIN) += berlin/ obj-$(CONFIG_ARCH_HI3xxx) += hisilicon/ obj-$(CONFIG_COMMON_CLK_KEYSTONE) += keystone/ ifeq ($(CONFIG_COMMON_CLK), y) diff --git a/drivers/clk/berlin/Makefile b/drivers/clk/berlin/Makefile new file mode 100644 index 000000000000..94859513de90 --- /dev/null +++ b/drivers/clk/berlin/Makefile @@ -0,0 +1,4 @@ +obj-y += pll.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/common.h b/drivers/clk/berlin/common.h new file mode 100644 index 000000000000..8eb8a9f9aa30 --- /dev/null +++ b/drivers/clk/berlin/common.h @@ -0,0 +1,35 @@ +/* + * 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/>. + */ +#ifndef __BERLIN_CLK_H +#define __BERLIN_CLK_H + +struct device_node; + +struct berlin_pllmap { + const u8 *vcodiv; + u32 fbdiv_mask; + u32 rfdiv_mask; + u32 divsel_mask; + u8 fbdiv_shift; + u8 rfdiv_shift; + u8 divsel_shift; + u8 mult; +}; + +extern void __init berlin_pll_setup(struct device_node *np, + struct berlin_pllmap *map); + +#endif /* BERLIN_CLK_H */ diff --git a/drivers/clk/berlin/pll-berlin2.c b/drivers/clk/berlin/pll-berlin2.c new file mode 100644 index 000000000000..bf5704f6ebc5 --- /dev/null +++ b/drivers/clk/berlin/pll-berlin2.c @@ -0,0 +1,40 @@ +/* + * 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/clk-provider.h> +#include <linux/io.h> +#include <linux/kernel.h> +#include <linux/of.h> + +#include "common.h" + +static const u8 vcodiv_berlin2[16] = {10, 15, 20, 25, 30, 40, 50, 60, 80}; + +static struct berlin_pllmap berlin_pll_map = { + .vcodiv = vcodiv_berlin2, + .fbdiv_mask = 0x1FF, + .fbdiv_shift = 6, + .rfdiv_mask = 0x1F, + .rfdiv_shift = 1, + .divsel_mask = 0xF, + .divsel_shift = 7, + .mult = 10, +}; + +static void __init berlin2_pll_setup(struct device_node *np) +{ + berlin_pll_setup(np, &berlin_pll_map); +} +CLK_OF_DECLARE(berlin2_pll, "marvell,berlin2-pll", berlin2_pll_setup); diff --git a/drivers/clk/berlin/pll-berlin2q.c b/drivers/clk/berlin/pll-berlin2q.c new file mode 100644 index 000000000000..4d0e3614c073 --- /dev/null +++ b/drivers/clk/berlin/pll-berlin2q.c @@ -0,0 +1,40 @@ +/* + * 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/clk-provider.h> +#include <linux/io.h> +#include <linux/kernel.h> +#include <linux/of.h> + +#include "common.h" + +static const u8 vcodiv_berlin2q[16] = {1, 0, 2, 0, 3, 4, 0, 6, 8}; + +static struct berlin_pllmap berlin2q_pll_map = { + .vcodiv = vcodiv_berlin2q, + .fbdiv_mask = 0x1FF, + .fbdiv_shift = 7, + .rfdiv_mask = 0x1F, + .rfdiv_shift = 2, + .divsel_mask = 0xF, + .divsel_shift = 9, + .mult = 1, +}; + +static void __init berlin2q_pll_setup(struct device_node *np) +{ + berlin_pll_setup(np, &berlin2q_pll_map); +} +CLK_OF_DECLARE(berlin2q_pll, "marvell,berlin2q-pll", berlin2q_pll_setup); diff --git a/drivers/clk/berlin/pll.c b/drivers/clk/berlin/pll.c new file mode 100644 index 000000000000..fd820ba484bb --- /dev/null +++ b/drivers/clk/berlin/pll.c @@ -0,0 +1,114 @@ +/* + * 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/clk-provider.h> +#include <linux/io.h> +#include <linux/kernel.h> +#include <linux/of.h> +#include <linux/of_address.h> +#include <linux/slab.h> +#include <asm/div64.h> + +#include "common.h" + +struct berlin_pll { + struct clk_hw hw; + void __iomem *base; + struct berlin_pllmap *map; +}; + +#define to_berlin_pll(hw) container_of(hw, struct berlin_pll, hw) + +#define PLL_CTRL0 0x00 +#define PLL_CTRL1 0x04 + +static inline u32 berlin_pll_read(struct berlin_pll *pll, unsigned long offset) +{ + return readl_relaxed(pll->base + offset); +} + +/* + * The output frequency formula for the pll is: + * clkout = fbdiv / refdiv * parent / vcodiv + */ +static unsigned long berlin_pll_recalc_rate(struct clk_hw *hw, + unsigned long parent_rate) +{ + struct berlin_pll *pll = to_berlin_pll(hw); + struct berlin_pllmap *map = pll->map; + u32 val, fbdiv, rfdiv, vcodivsel, vcodiv; + u64 rate = parent_rate; + + val = berlin_pll_read(pll, PLL_CTRL0); + fbdiv = (val >> map->fbdiv_shift) & map->fbdiv_mask; + rfdiv = (val >> map->rfdiv_shift) & map->rfdiv_mask; + if (rfdiv == 0) { + pr_warn("%s has zero rfdiv\n", __clk_get_name(hw->clk)); + rfdiv = 1; + } + + val = berlin_pll_read(pll, PLL_CTRL1); + vcodivsel = (val >> map->divsel_shift) & map->divsel_mask; + vcodiv = map->vcodiv[vcodivsel]; + if (vcodiv == 0) { + pr_warn("%s has zero vcodiv (index %d)\n", + __clk_get_name(hw->clk), vcodivsel); + vcodiv = 1; + } + + rate *= fbdiv * map->mult; + do_div(rate, rfdiv * vcodiv); + return (unsigned long)rate; +} + +static const struct clk_ops berlin_pll_ops = { + .recalc_rate = berlin_pll_recalc_rate, +}; + +void __init berlin_pll_setup(struct device_node *np, + struct berlin_pllmap *map) +{ + struct clk_init_data init; + struct berlin_pll *pll; + const char *parent_name; + struct clk *clk; + int ret; + + pll = kzalloc(sizeof(*pll), GFP_KERNEL); + if (WARN_ON(!pll)) + return; + + pll->base = of_iomap(np, 0); + if (WARN_ON(!pll->base)) + return; + + pll->map = map; + + init.name = np->name; + init.ops = &berlin_pll_ops; + parent_name = of_clk_get_parent_name(np, 0); + init.parent_names = &parent_name; + init.num_parents = 1; + + 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; +} -- 1.8.3.2 -- To unsubscribe from this list: send the line "unsubscribe linux-doc" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
