532 lines
14 KiB
C
532 lines
14 KiB
C
// SPDX-License-Identifier: GPL-2.0+
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/*
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* Copyright (C) 2019 Microchip Technology Inc.
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*
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*/
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#include <linux/bitfield.h>
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#include <linux/clk-provider.h>
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#include <linux/clkdev.h>
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#include <linux/clk/at91_pmc.h>
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#include <linux/of.h>
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#include <linux/mfd/syscon.h>
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#include <linux/regmap.h>
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#include "pmc.h"
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#define PMC_PLL_CTRL0_DIV_MSK GENMASK(7, 0)
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#define PMC_PLL_CTRL1_MUL_MSK GENMASK(31, 24)
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#define PMC_PLL_CTRL1_FRACR_MSK GENMASK(21, 0)
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#define PLL_DIV_MAX (FIELD_GET(PMC_PLL_CTRL0_DIV_MSK, UINT_MAX) + 1)
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#define UPLL_DIV 2
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#define PLL_MUL_MAX (FIELD_GET(PMC_PLL_CTRL1_MUL_MSK, UINT_MAX) + 1)
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#define FCORE_MIN (600000000)
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#define FCORE_MAX (1200000000)
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#define PLL_MAX_ID 7
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struct sam9x60_pll_core {
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struct regmap *regmap;
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spinlock_t *lock;
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const struct clk_pll_characteristics *characteristics;
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const struct clk_pll_layout *layout;
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struct clk_hw hw;
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u8 id;
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};
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struct sam9x60_frac {
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struct sam9x60_pll_core core;
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u32 frac;
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u16 mul;
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};
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struct sam9x60_div {
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struct sam9x60_pll_core core;
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u8 div;
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};
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#define to_sam9x60_pll_core(hw) container_of(hw, struct sam9x60_pll_core, hw)
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#define to_sam9x60_frac(core) container_of(core, struct sam9x60_frac, core)
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#define to_sam9x60_div(core) container_of(core, struct sam9x60_div, core)
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static inline bool sam9x60_pll_ready(struct regmap *regmap, int id)
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{
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unsigned int status;
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regmap_read(regmap, AT91_PMC_PLL_ISR0, &status);
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return !!(status & BIT(id));
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}
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static bool sam9x60_frac_pll_ready(struct regmap *regmap, u8 id)
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{
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return sam9x60_pll_ready(regmap, id);
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}
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static unsigned long sam9x60_frac_pll_recalc_rate(struct clk_hw *hw,
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unsigned long parent_rate)
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{
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struct sam9x60_pll_core *core = to_sam9x60_pll_core(hw);
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struct sam9x60_frac *frac = to_sam9x60_frac(core);
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return (parent_rate * (frac->mul + 1) +
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((u64)parent_rate * frac->frac >> 22));
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}
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static int sam9x60_frac_pll_prepare(struct clk_hw *hw)
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{
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struct sam9x60_pll_core *core = to_sam9x60_pll_core(hw);
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struct sam9x60_frac *frac = to_sam9x60_frac(core);
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struct regmap *regmap = core->regmap;
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unsigned int val, cfrac, cmul;
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unsigned long flags;
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spin_lock_irqsave(core->lock, flags);
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regmap_update_bits(regmap, AT91_PMC_PLL_UPDT,
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AT91_PMC_PLL_UPDT_ID_MSK, core->id);
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regmap_read(regmap, AT91_PMC_PLL_CTRL1, &val);
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cmul = (val & core->layout->mul_mask) >> core->layout->mul_shift;
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cfrac = (val & core->layout->frac_mask) >> core->layout->frac_shift;
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if (sam9x60_frac_pll_ready(regmap, core->id) &&
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(cmul == frac->mul && cfrac == frac->frac))
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goto unlock;
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/* Recommended value for PMC_PLL_ACR */
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if (core->characteristics->upll)
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val = AT91_PMC_PLL_ACR_DEFAULT_UPLL;
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else
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val = AT91_PMC_PLL_ACR_DEFAULT_PLLA;
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regmap_write(regmap, AT91_PMC_PLL_ACR, val);
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regmap_write(regmap, AT91_PMC_PLL_CTRL1,
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(frac->mul << core->layout->mul_shift) |
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(frac->frac << core->layout->frac_shift));
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if (core->characteristics->upll) {
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/* Enable the UTMI internal bandgap */
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val |= AT91_PMC_PLL_ACR_UTMIBG;
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regmap_write(regmap, AT91_PMC_PLL_ACR, val);
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udelay(10);
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/* Enable the UTMI internal regulator */
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val |= AT91_PMC_PLL_ACR_UTMIVR;
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regmap_write(regmap, AT91_PMC_PLL_ACR, val);
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udelay(10);
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}
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regmap_update_bits(regmap, AT91_PMC_PLL_UPDT,
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AT91_PMC_PLL_UPDT_UPDATE | AT91_PMC_PLL_UPDT_ID_MSK,
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AT91_PMC_PLL_UPDT_UPDATE | core->id);
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regmap_update_bits(regmap, AT91_PMC_PLL_CTRL0,
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AT91_PMC_PLL_CTRL0_ENLOCK | AT91_PMC_PLL_CTRL0_ENPLL,
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AT91_PMC_PLL_CTRL0_ENLOCK | AT91_PMC_PLL_CTRL0_ENPLL);
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regmap_update_bits(regmap, AT91_PMC_PLL_UPDT,
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AT91_PMC_PLL_UPDT_UPDATE | AT91_PMC_PLL_UPDT_ID_MSK,
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AT91_PMC_PLL_UPDT_UPDATE | core->id);
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while (!sam9x60_pll_ready(regmap, core->id))
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cpu_relax();
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unlock:
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spin_unlock_irqrestore(core->lock, flags);
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return 0;
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}
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static void sam9x60_frac_pll_unprepare(struct clk_hw *hw)
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{
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struct sam9x60_pll_core *core = to_sam9x60_pll_core(hw);
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struct regmap *regmap = core->regmap;
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unsigned long flags;
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spin_lock_irqsave(core->lock, flags);
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regmap_update_bits(regmap, AT91_PMC_PLL_UPDT,
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AT91_PMC_PLL_UPDT_ID_MSK, core->id);
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regmap_update_bits(regmap, AT91_PMC_PLL_CTRL0, AT91_PMC_PLL_CTRL0_ENPLL, 0);
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if (core->characteristics->upll)
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regmap_update_bits(regmap, AT91_PMC_PLL_ACR,
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AT91_PMC_PLL_ACR_UTMIBG | AT91_PMC_PLL_ACR_UTMIVR, 0);
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regmap_update_bits(regmap, AT91_PMC_PLL_UPDT,
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AT91_PMC_PLL_UPDT_UPDATE | AT91_PMC_PLL_UPDT_ID_MSK,
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AT91_PMC_PLL_UPDT_UPDATE | core->id);
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spin_unlock_irqrestore(core->lock, flags);
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}
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static int sam9x60_frac_pll_is_prepared(struct clk_hw *hw)
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{
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struct sam9x60_pll_core *core = to_sam9x60_pll_core(hw);
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return sam9x60_pll_ready(core->regmap, core->id);
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}
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static long sam9x60_frac_pll_compute_mul_frac(struct sam9x60_pll_core *core,
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unsigned long rate,
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unsigned long parent_rate,
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bool update)
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{
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struct sam9x60_frac *frac = to_sam9x60_frac(core);
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unsigned long tmprate, remainder;
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unsigned long nmul = 0;
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unsigned long nfrac = 0;
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if (rate < FCORE_MIN || rate > FCORE_MAX)
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return -ERANGE;
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/*
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* Calculate the multiplier associated with the current
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* divider that provide the closest rate to the requested one.
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*/
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nmul = mult_frac(rate, 1, parent_rate);
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tmprate = mult_frac(parent_rate, nmul, 1);
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remainder = rate - tmprate;
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if (remainder) {
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nfrac = DIV_ROUND_CLOSEST_ULL((u64)remainder * (1 << 22),
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parent_rate);
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tmprate += DIV_ROUND_CLOSEST_ULL((u64)nfrac * parent_rate,
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(1 << 22));
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}
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/* Check if resulted rate is a valid. */
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if (tmprate < FCORE_MIN || tmprate > FCORE_MAX)
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return -ERANGE;
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if (update) {
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frac->mul = nmul - 1;
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frac->frac = nfrac;
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}
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return tmprate;
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}
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static long sam9x60_frac_pll_round_rate(struct clk_hw *hw, unsigned long rate,
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unsigned long *parent_rate)
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{
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struct sam9x60_pll_core *core = to_sam9x60_pll_core(hw);
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return sam9x60_frac_pll_compute_mul_frac(core, rate, *parent_rate, false);
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}
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static int sam9x60_frac_pll_set_rate(struct clk_hw *hw, unsigned long rate,
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unsigned long parent_rate)
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{
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struct sam9x60_pll_core *core = to_sam9x60_pll_core(hw);
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return sam9x60_frac_pll_compute_mul_frac(core, rate, parent_rate, true);
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}
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static const struct clk_ops sam9x60_frac_pll_ops = {
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.prepare = sam9x60_frac_pll_prepare,
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.unprepare = sam9x60_frac_pll_unprepare,
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.is_prepared = sam9x60_frac_pll_is_prepared,
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.recalc_rate = sam9x60_frac_pll_recalc_rate,
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.round_rate = sam9x60_frac_pll_round_rate,
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.set_rate = sam9x60_frac_pll_set_rate,
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};
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static int sam9x60_div_pll_prepare(struct clk_hw *hw)
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{
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struct sam9x60_pll_core *core = to_sam9x60_pll_core(hw);
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struct sam9x60_div *div = to_sam9x60_div(core);
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struct regmap *regmap = core->regmap;
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unsigned long flags;
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unsigned int val, cdiv;
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spin_lock_irqsave(core->lock, flags);
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regmap_update_bits(regmap, AT91_PMC_PLL_UPDT,
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AT91_PMC_PLL_UPDT_ID_MSK, core->id);
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regmap_read(regmap, AT91_PMC_PLL_CTRL0, &val);
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cdiv = (val & core->layout->div_mask) >> core->layout->div_shift;
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/* Stop if enabled an nothing changed. */
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if (!!(val & core->layout->endiv_mask) && cdiv == div->div)
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goto unlock;
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regmap_update_bits(regmap, AT91_PMC_PLL_CTRL0,
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core->layout->div_mask | core->layout->endiv_mask,
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(div->div << core->layout->div_shift) |
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(1 << core->layout->endiv_shift));
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regmap_update_bits(regmap, AT91_PMC_PLL_UPDT,
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AT91_PMC_PLL_UPDT_UPDATE | AT91_PMC_PLL_UPDT_ID_MSK,
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AT91_PMC_PLL_UPDT_UPDATE | core->id);
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while (!sam9x60_pll_ready(regmap, core->id))
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cpu_relax();
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unlock:
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spin_unlock_irqrestore(core->lock, flags);
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return 0;
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}
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static void sam9x60_div_pll_unprepare(struct clk_hw *hw)
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{
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struct sam9x60_pll_core *core = to_sam9x60_pll_core(hw);
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struct regmap *regmap = core->regmap;
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unsigned long flags;
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spin_lock_irqsave(core->lock, flags);
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regmap_update_bits(regmap, AT91_PMC_PLL_UPDT,
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AT91_PMC_PLL_UPDT_ID_MSK, core->id);
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regmap_update_bits(regmap, AT91_PMC_PLL_CTRL0,
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core->layout->endiv_mask, 0);
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regmap_update_bits(regmap, AT91_PMC_PLL_UPDT,
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AT91_PMC_PLL_UPDT_UPDATE | AT91_PMC_PLL_UPDT_ID_MSK,
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AT91_PMC_PLL_UPDT_UPDATE | core->id);
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spin_unlock_irqrestore(core->lock, flags);
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}
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static int sam9x60_div_pll_is_prepared(struct clk_hw *hw)
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{
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struct sam9x60_pll_core *core = to_sam9x60_pll_core(hw);
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struct regmap *regmap = core->regmap;
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unsigned long flags;
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unsigned int val;
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spin_lock_irqsave(core->lock, flags);
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regmap_update_bits(regmap, AT91_PMC_PLL_UPDT,
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AT91_PMC_PLL_UPDT_ID_MSK, core->id);
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regmap_read(regmap, AT91_PMC_PLL_CTRL0, &val);
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spin_unlock_irqrestore(core->lock, flags);
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return !!(val & core->layout->endiv_mask);
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}
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static unsigned long sam9x60_div_pll_recalc_rate(struct clk_hw *hw,
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unsigned long parent_rate)
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{
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struct sam9x60_pll_core *core = to_sam9x60_pll_core(hw);
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struct sam9x60_div *div = to_sam9x60_div(core);
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return DIV_ROUND_CLOSEST_ULL(parent_rate, (div->div + 1));
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}
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static long sam9x60_div_pll_compute_div(struct sam9x60_pll_core *core,
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unsigned long *parent_rate,
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unsigned long rate)
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{
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const struct clk_pll_characteristics *characteristics =
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core->characteristics;
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struct clk_hw *parent = clk_hw_get_parent(&core->hw);
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unsigned long tmp_rate, tmp_parent_rate, tmp_diff;
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long best_diff = -1, best_rate = -EINVAL;
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u32 divid;
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if (!rate)
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return 0;
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if (rate < characteristics->output[0].min ||
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rate > characteristics->output[0].max)
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return -ERANGE;
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for (divid = 1; divid < core->layout->div_mask; divid++) {
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tmp_parent_rate = clk_hw_round_rate(parent, rate * divid);
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if (!tmp_parent_rate)
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continue;
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tmp_rate = DIV_ROUND_CLOSEST_ULL(tmp_parent_rate, divid);
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tmp_diff = abs(rate - tmp_rate);
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if (best_diff < 0 || best_diff > tmp_diff) {
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*parent_rate = tmp_parent_rate;
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best_rate = tmp_rate;
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best_diff = tmp_diff;
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}
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if (!best_diff)
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break;
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}
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if (best_rate < characteristics->output[0].min ||
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best_rate > characteristics->output[0].max)
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return -ERANGE;
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return best_rate;
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}
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static long sam9x60_div_pll_round_rate(struct clk_hw *hw, unsigned long rate,
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unsigned long *parent_rate)
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{
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struct sam9x60_pll_core *core = to_sam9x60_pll_core(hw);
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return sam9x60_div_pll_compute_div(core, parent_rate, rate);
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}
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static int sam9x60_div_pll_set_rate(struct clk_hw *hw, unsigned long rate,
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unsigned long parent_rate)
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{
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struct sam9x60_pll_core *core = to_sam9x60_pll_core(hw);
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struct sam9x60_div *div = to_sam9x60_div(core);
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div->div = DIV_ROUND_CLOSEST(parent_rate, rate) - 1;
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return 0;
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}
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static const struct clk_ops sam9x60_div_pll_ops = {
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.prepare = sam9x60_div_pll_prepare,
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.unprepare = sam9x60_div_pll_unprepare,
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.is_prepared = sam9x60_div_pll_is_prepared,
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.recalc_rate = sam9x60_div_pll_recalc_rate,
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.round_rate = sam9x60_div_pll_round_rate,
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.set_rate = sam9x60_div_pll_set_rate,
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};
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struct clk_hw * __init
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sam9x60_clk_register_frac_pll(struct regmap *regmap, spinlock_t *lock,
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const char *name, const char *parent_name,
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struct clk_hw *parent_hw, u8 id,
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const struct clk_pll_characteristics *characteristics,
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const struct clk_pll_layout *layout, bool critical)
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{
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struct sam9x60_frac *frac;
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struct clk_hw *hw;
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struct clk_init_data init;
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unsigned long parent_rate, flags;
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unsigned int val;
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int ret;
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if (id > PLL_MAX_ID || !lock || !parent_hw)
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return ERR_PTR(-EINVAL);
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frac = kzalloc(sizeof(*frac), GFP_KERNEL);
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if (!frac)
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return ERR_PTR(-ENOMEM);
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init.name = name;
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init.parent_names = &parent_name;
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init.num_parents = 1;
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init.ops = &sam9x60_frac_pll_ops;
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init.flags = CLK_SET_RATE_GATE;
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if (critical)
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init.flags |= CLK_IS_CRITICAL;
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frac->core.id = id;
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frac->core.hw.init = &init;
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frac->core.characteristics = characteristics;
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frac->core.layout = layout;
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frac->core.regmap = regmap;
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frac->core.lock = lock;
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spin_lock_irqsave(frac->core.lock, flags);
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if (sam9x60_pll_ready(regmap, id)) {
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regmap_update_bits(regmap, AT91_PMC_PLL_UPDT,
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AT91_PMC_PLL_UPDT_ID_MSK, id);
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regmap_read(regmap, AT91_PMC_PLL_CTRL1, &val);
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frac->mul = FIELD_GET(PMC_PLL_CTRL1_MUL_MSK, val);
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frac->frac = FIELD_GET(PMC_PLL_CTRL1_FRACR_MSK, val);
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} else {
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/*
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* This means the PLL is not setup by bootloaders. In this
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* case we need to set the minimum rate for it. Otherwise
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* a clock child of this PLL may be enabled before setting
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* its rate leading to enabling this PLL with unsupported
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* rate. This will lead to PLL not being locked at all.
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*/
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parent_rate = clk_hw_get_rate(parent_hw);
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if (!parent_rate) {
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hw = ERR_PTR(-EINVAL);
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goto free;
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}
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ret = sam9x60_frac_pll_compute_mul_frac(&frac->core, FCORE_MIN,
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parent_rate, true);
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if (ret <= 0) {
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hw = ERR_PTR(ret);
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goto free;
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}
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}
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spin_unlock_irqrestore(frac->core.lock, flags);
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hw = &frac->core.hw;
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ret = clk_hw_register(NULL, hw);
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if (ret) {
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kfree(frac);
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hw = ERR_PTR(ret);
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}
|
|
|
|
return hw;
|
|
|
|
free:
|
|
spin_unlock_irqrestore(frac->core.lock, flags);
|
|
kfree(frac);
|
|
return hw;
|
|
}
|
|
|
|
struct clk_hw * __init
|
|
sam9x60_clk_register_div_pll(struct regmap *regmap, spinlock_t *lock,
|
|
const char *name, const char *parent_name, u8 id,
|
|
const struct clk_pll_characteristics *characteristics,
|
|
const struct clk_pll_layout *layout, bool critical)
|
|
{
|
|
struct sam9x60_div *div;
|
|
struct clk_hw *hw;
|
|
struct clk_init_data init;
|
|
unsigned long flags;
|
|
unsigned int val;
|
|
int ret;
|
|
|
|
if (id > PLL_MAX_ID || !lock)
|
|
return ERR_PTR(-EINVAL);
|
|
|
|
div = kzalloc(sizeof(*div), GFP_KERNEL);
|
|
if (!div)
|
|
return ERR_PTR(-ENOMEM);
|
|
|
|
init.name = name;
|
|
init.parent_names = &parent_name;
|
|
init.num_parents = 1;
|
|
init.ops = &sam9x60_div_pll_ops;
|
|
init.flags = CLK_SET_RATE_GATE | CLK_SET_PARENT_GATE |
|
|
CLK_SET_RATE_PARENT;
|
|
if (critical)
|
|
init.flags |= CLK_IS_CRITICAL;
|
|
|
|
div->core.id = id;
|
|
div->core.hw.init = &init;
|
|
div->core.characteristics = characteristics;
|
|
div->core.layout = layout;
|
|
div->core.regmap = regmap;
|
|
div->core.lock = lock;
|
|
|
|
spin_lock_irqsave(div->core.lock, flags);
|
|
|
|
regmap_update_bits(regmap, AT91_PMC_PLL_UPDT,
|
|
AT91_PMC_PLL_UPDT_ID_MSK, id);
|
|
regmap_read(regmap, AT91_PMC_PLL_CTRL0, &val);
|
|
div->div = FIELD_GET(PMC_PLL_CTRL0_DIV_MSK, val);
|
|
|
|
spin_unlock_irqrestore(div->core.lock, flags);
|
|
|
|
hw = &div->core.hw;
|
|
ret = clk_hw_register(NULL, hw);
|
|
if (ret) {
|
|
kfree(div);
|
|
hw = ERR_PTR(ret);
|
|
}
|
|
|
|
return hw;
|
|
}
|
|
|