100 lines · c
1// SPDX-License-Identifier: GPL-2.02/*3 * Copyright (c) 2014 Marvell Technology Group Ltd.4 *5 * Alexandre Belloni <alexandre.belloni@free-electrons.com>6 * Sebastian Hesselbarth <sebastian.hesselbarth@gmail.com>7 */8#include <linux/clk-provider.h>9#include <linux/io.h>10#include <linux/kernel.h>11#include <linux/of.h>12#include <linux/of_address.h>13#include <linux/slab.h>14#include <asm/div64.h>15 16#include "berlin2-div.h"17#include "berlin2-pll.h"18 19struct berlin2_pll {20 struct clk_hw hw;21 void __iomem *base;22 struct berlin2_pll_map map;23};24 25#define to_berlin2_pll(hw) container_of(hw, struct berlin2_pll, hw)26 27#define SPLL_CTRL0 0x0028#define SPLL_CTRL1 0x0429#define SPLL_CTRL2 0x0830#define SPLL_CTRL3 0x0c31#define SPLL_CTRL4 0x1032 33#define FBDIV_MASK 0x1ff34#define RFDIV_MASK 0x1f35#define DIVSEL_MASK 0xf36 37/*38 * The output frequency formula for the pll is:39 * clkout = fbdiv / refdiv * parent / vcodiv40 */41static unsigned long42berlin2_pll_recalc_rate(struct clk_hw *hw, unsigned long parent_rate)43{44 struct berlin2_pll *pll = to_berlin2_pll(hw);45 struct berlin2_pll_map *map = &pll->map;46 u32 val, fbdiv, rfdiv, vcodivsel, vcodiv;47 u64 rate = parent_rate;48 49 val = readl_relaxed(pll->base + SPLL_CTRL0);50 fbdiv = (val >> map->fbdiv_shift) & FBDIV_MASK;51 rfdiv = (val >> map->rfdiv_shift) & RFDIV_MASK;52 if (rfdiv == 0) {53 pr_warn("%s has zero rfdiv\n", clk_hw_get_name(hw));54 rfdiv = 1;55 }56 57 val = readl_relaxed(pll->base + SPLL_CTRL1);58 vcodivsel = (val >> map->divsel_shift) & DIVSEL_MASK;59 vcodiv = map->vcodiv[vcodivsel];60 if (vcodiv == 0) {61 pr_warn("%s has zero vcodiv (index %d)\n",62 clk_hw_get_name(hw), vcodivsel);63 vcodiv = 1;64 }65 66 rate *= fbdiv * map->mult;67 do_div(rate, rfdiv * vcodiv);68 69 return (unsigned long)rate;70}71 72static const struct clk_ops berlin2_pll_ops = {73 .recalc_rate = berlin2_pll_recalc_rate,74};75 76int __init77berlin2_pll_register(const struct berlin2_pll_map *map,78 void __iomem *base, const char *name,79 const char *parent_name, unsigned long flags)80{81 struct clk_init_data init;82 struct berlin2_pll *pll;83 84 pll = kzalloc(sizeof(*pll), GFP_KERNEL);85 if (!pll)86 return -ENOMEM;87 88 /* copy pll_map to allow __initconst */89 memcpy(&pll->map, map, sizeof(*map));90 pll->base = base;91 pll->hw.init = &init;92 init.name = name;93 init.ops = &berlin2_pll_ops;94 init.parent_names = &parent_name;95 init.num_parents = 1;96 init.flags = flags;97 98 return clk_hw_register(NULL, &pll->hw);99}100