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99 lines
2.4 KiB
99 lines
2.4 KiB
// SPDX-License-Identifier: GPL-2.0 |
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/* |
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* Copyright (c) 2014 Marvell Technology Group Ltd. |
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* |
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* Alexandre Belloni <[email protected]> |
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* Sebastian Hesselbarth <[email protected]> |
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*/ |
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#include <linux/clk-provider.h> |
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#include <linux/io.h> |
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#include <linux/kernel.h> |
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#include <linux/of.h> |
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#include <linux/of_address.h> |
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#include <linux/slab.h> |
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#include <asm/div64.h> |
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#include "berlin2-div.h" |
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#include "berlin2-pll.h" |
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struct berlin2_pll { |
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struct clk_hw hw; |
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void __iomem *base; |
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struct berlin2_pll_map map; |
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}; |
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#define to_berlin2_pll(hw) container_of(hw, struct berlin2_pll, hw) |
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#define SPLL_CTRL0 0x00 |
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#define SPLL_CTRL1 0x04 |
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#define SPLL_CTRL2 0x08 |
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#define SPLL_CTRL3 0x0c |
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#define SPLL_CTRL4 0x10 |
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#define FBDIV_MASK 0x1ff |
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#define RFDIV_MASK 0x1f |
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#define DIVSEL_MASK 0xf |
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/* |
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* The output frequency formula for the pll is: |
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* clkout = fbdiv / refdiv * parent / vcodiv |
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*/ |
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static unsigned long |
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berlin2_pll_recalc_rate(struct clk_hw *hw, unsigned long parent_rate) |
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{ |
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struct berlin2_pll *pll = to_berlin2_pll(hw); |
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struct berlin2_pll_map *map = &pll->map; |
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u32 val, fbdiv, rfdiv, vcodivsel, vcodiv; |
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u64 rate = parent_rate; |
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val = readl_relaxed(pll->base + SPLL_CTRL0); |
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fbdiv = (val >> map->fbdiv_shift) & FBDIV_MASK; |
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rfdiv = (val >> map->rfdiv_shift) & RFDIV_MASK; |
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if (rfdiv == 0) { |
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pr_warn("%s has zero rfdiv\n", clk_hw_get_name(hw)); |
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rfdiv = 1; |
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} |
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val = readl_relaxed(pll->base + SPLL_CTRL1); |
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vcodivsel = (val >> map->divsel_shift) & DIVSEL_MASK; |
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vcodiv = map->vcodiv[vcodivsel]; |
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if (vcodiv == 0) { |
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pr_warn("%s has zero vcodiv (index %d)\n", |
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clk_hw_get_name(hw), vcodivsel); |
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vcodiv = 1; |
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} |
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rate *= fbdiv * map->mult; |
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do_div(rate, rfdiv * vcodiv); |
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return (unsigned long)rate; |
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} |
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static const struct clk_ops berlin2_pll_ops = { |
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.recalc_rate = berlin2_pll_recalc_rate, |
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}; |
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int __init |
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berlin2_pll_register(const struct berlin2_pll_map *map, |
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void __iomem *base, const char *name, |
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const char *parent_name, unsigned long flags) |
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{ |
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struct clk_init_data init; |
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struct berlin2_pll *pll; |
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pll = kzalloc(sizeof(*pll), GFP_KERNEL); |
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if (!pll) |
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return -ENOMEM; |
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/* copy pll_map to allow __initconst */ |
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memcpy(&pll->map, map, sizeof(*map)); |
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pll->base = base; |
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pll->hw.init = &init; |
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init.name = name; |
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init.ops = &berlin2_pll_ops; |
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init.parent_names = &parent_name; |
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init.num_parents = 1; |
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init.flags = flags; |
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return clk_hw_register(NULL, &pll->hw); |
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}
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