2 * Copyright (c) 2014 Marvell Technology Group Ltd.
4 * Alexandre Belloni <alexandre.belloni@free-electrons.com>
5 * Sebastian Hesselbarth <sebastian.hesselbarth@gmail.com>
7 * This program is free software; you can redistribute it and/or modify it
8 * under the terms and conditions of the GNU General Public License,
9 * version 2, as published by the Free Software Foundation.
11 * This program is distributed in the hope it will be useful, but WITHOUT
12 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
13 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
16 * You should have received a copy of the GNU General Public License along with
17 * this program. If not, see <http://www.gnu.org/licenses/>.
19 #include <linux/clk-provider.h>
21 #include <linux/kernel.h>
23 #include <linux/of_address.h>
24 #include <linux/slab.h>
25 #include <asm/div64.h>
27 #include "berlin2-div.h"
29 struct berlin2_pll_map {
40 struct berlin2_pll_map map;
43 #define to_berlin2_pll(hw) container_of(hw, struct berlin2_pll, hw)
45 #define SPLL_CTRL0 0x00
46 #define SPLL_CTRL1 0x04
47 #define SPLL_CTRL2 0x08
48 #define SPLL_CTRL3 0x0c
49 #define SPLL_CTRL4 0x10
51 #define FBDIV_MASK 0x1ff
52 #define RFDIV_MASK 0x1f
53 #define DIVSEL_MASK 0xf
56 * The output frequency formula for the pll is:
57 * clkout = fbdiv / refdiv * parent / vcodiv
60 berlin2_pll_recalc_rate(struct clk_hw *hw, unsigned long parent_rate)
62 struct berlin2_pll *pll = to_berlin2_pll(hw);
63 struct berlin2_pll_map *map = &pll->map;
64 u32 val, fbdiv, rfdiv, vcodivsel, vcodiv;
65 u64 rate = parent_rate;
67 val = readl_relaxed(pll->base + SPLL_CTRL0);
68 fbdiv = (val >> map->fbdiv_shift) & FBDIV_MASK;
69 rfdiv = (val >> map->rfdiv_shift) & RFDIV_MASK;
71 pr_warn("%s has zero rfdiv\n", __clk_get_name(hw->clk));
75 val = readl_relaxed(pll->base + SPLL_CTRL1);
76 vcodivsel = (val >> map->divsel_shift) & DIVSEL_MASK;
77 vcodiv = map->vcodiv[vcodivsel];
79 pr_warn("%s has zero vcodiv (index %d)\n",
80 __clk_get_name(hw->clk), vcodivsel);
84 rate *= fbdiv * map->mult;
85 do_div(rate, rfdiv * vcodiv);
87 return (unsigned long)rate;
90 static const struct clk_ops berlin2_pll_ops = {
91 .recalc_rate = berlin2_pll_recalc_rate,
95 berlin2_pll_register(const struct berlin2_pll_map *map,
96 void __iomem *base, const char *name,
97 const char *parent_name, unsigned long flags)
99 struct clk_init_data init;
100 struct berlin2_pll *pll;
102 pll = kzalloc(sizeof(*pll), GFP_KERNEL);
104 return ERR_PTR(-ENOMEM);
106 /* copy pll_map to allow __initconst */
107 memcpy(&pll->map, map, sizeof(*map));
109 pll->hw.init = &init;
111 init.ops = &berlin2_pll_ops;
112 init.parent_names = &parent_name;
113 init.num_parents = 1;
116 return clk_register(NULL, &pll->hw);