On 06/18, Chunyan Zhang wrote:
> diff --git a/drivers/clk/sprd/Makefile b/drivers/clk/sprd/Makefile
> index 83232e5..c593a93 100644
> --- a/drivers/clk/sprd/Makefile
> +++ b/drivers/clk/sprd/Makefile
> @@ -1,3 +1,3 @@
> ifneq ($(CONFIG_OF),)
> -obj-y += ccu_common.o ccu_gate.o ccu_mux.o ccu_div.o ccu_composite.o
> +obj-y += ccu_common.o ccu_gate.o ccu_mux.o ccu_div.o ccu_composite.o ccu_pll.o
> endif
> diff --git a/drivers/clk/sprd/ccu_pll.c b/drivers/clk/sprd/ccu_pll.c
> new file mode 100644
> index 0000000..6c908e4
> --- /dev/null
> +++ b/drivers/clk/sprd/ccu_pll.c
> @@ -0,0 +1,241 @@
> +/*
> + * Spreadtrum pll clock driver
> + *
> + * Copyright (C) 2015~2017 Spreadtrum, Inc.
> + *
> + * SPDX-License-Identifier: GPL-2.0
> + */
> +
> +#include <linux/delay.h>
> +#include <linux/clk.h>
Is this include used? Should be clk-provider?
> +#include <linux/err.h>
> +#include <linux/slab.h>
> +
> +#include "ccu_pll.h"
> +
> +#define CCU_PLL_1M 1000000
> +#define CCU_PLL_10M (CCU_PLL_1M * 10)
> +
> +#define pindex(pll, member) \
> + (pll->factors[member].shift / (8 * sizeof(pll->regs[0])))
> +
> +#define pshift(pll, member) \
> + (pll->factors[member].shift % (8 * sizeof(pll->regs[0])))
> +
> +#define pwidth(pll, member) \
> + pll->factors[member].width
> +
> +#define pmask(pll, member) \
> + ((pwidth(pll, member)) ? \
> + GENMASK(pwidth(pll, member) + pshift(pll, member) - 1, \
> + pshift(pll, member)) : 0)
> +
> +#define pinternal(pll, cfg, member) \
> + (cfg[pindex(pll, member)] & pmask(pll, member))
> +
> +#define pinternal_val(pll, cfg, member) \
> + (pinternal(pll, cfg, member) >> pshift(pll, member))
> +
> +static unsigned long pll_get_refin_rate(struct ccu_pll *pll)
pll could be const?
> +{
> + u8 shift, index, refin_id = 3;
> + u32 mask;
> + const unsigned long refin[4] = { 2, 4, 13, 26 };
> +
> + if (pwidth(pll, PLL_REFIN)) {
> + index = pindex(pll, PLL_REFIN);
> + shift = pshift(pll, PLL_REFIN);
> + mask = pmask(pll, PLL_REFIN);
> + refin_id = (ccu_pll_readl(pll, index) & mask) >> shift;
> + if (refin_id > 3)
> + refin_id = 3;
> + }
> +
> + return refin[refin_id];
> +}
> +
> +static u8 pll_get_ibias(unsigned long rate, const u64 *table)
> +{
> + u64 i;
> + u8 num = table[0];
> +
> + for (i = 0; i < num; i++)
> + if (rate <= table[i + 1])
> + break;
> +
> + return i == num ? num - 1 : i;
> +}
> +
> +static unsigned long ccu_pll_helper_recalc_rate(struct ccu_pll *pll,
> + unsigned long parent_rate)
> +{
> + unsigned long rate, refin, k1, k2;
> + unsigned long kint = 0, nint;
> + u32 reg_num = pll->regs[0];
> + u32 *cfg;
> + u32 i;
> + u32 mask;
> +
> + cfg = kcalloc(reg_num, sizeof(*cfg), GFP_KERNEL);
> + if (!cfg)
> + return -ENOMEM;
> +
> + for (i = 0; i < reg_num; i++)
> + cfg[i] = ccu_pll_readl(pll, i);
> +
> + refin = pll_get_refin_rate(pll);
> +
> + if (pinternal(pll, cfg, PLL_PREDIV))
> + refin = refin * 2;
> +
> + if (pwidth(pll, PLL_POSTDIV) &&
> + ((pll->fflag == 1 && pinternal(pll, cfg, PLL_POSTDIV)) ||
> + (!pll->fflag && !pinternal(pll, cfg, PLL_POSTDIV))))
> + refin = refin / 2;
> +
> + if (!pinternal(pll, cfg, PLL_DIV_S))
> + rate = refin * pinternal_val(pll, cfg, PLL_N) * CCU_PLL_10M;
> + else {
Please include braces on the if as well when another branch has them.
> + nint = pinternal_val(pll, cfg, PLL_NINT);
> + if (pinternal(pll, cfg, PLL_SDM_EN))
> + kint = pinternal_val(pll, cfg, PLL_KINT);
> +
> + mask = pmask(pll, PLL_KINT);
> +#ifdef CONFIG_64BIT
> + k1 = 1000;
> + k2 = 1000;
> + rate = DIV_ROUND_CLOSEST(refin * kint * k1,
> + ((mask >> __ffs(mask)) + 1)) *
> + k2 + refin * nint * CCU_PLL_1M;
> +#else
> + k1 = 100;
> + k2 = 10000;
> + i = pwidth(pll, PLL_KINT);
> + i = i < 21 ? 0 : i - 21;
> + rate = DIV_ROUND_CLOSEST(refin * (kint >> i) * k1,
> + ((mask >> (__ffs(mask) + i)) + 1)) *
> + k2 + refin * nint * CCU_PLL_1M;
> +#endif
> + }
> +
> + return rate;
> +}
> +
> +static int ccu_pll_helper_set_rate(struct ccu_pll *pll,
> + unsigned long rate,
> + unsigned long parent_rate)
> +{
> + u32 mask, shift, width, ibias_val, index, kint, nint;
> + u32 reg_num = pll->regs[0], i = 0;
> + unsigned long refin, fvco = rate;
> + struct reg_cfg *cfg;
> +
> + cfg = kcalloc(reg_num, sizeof(*cfg), GFP_KERNEL);
> + if (!cfg)
> + return -ENOMEM;
> +
> + refin = pll_get_refin_rate(pll);
> +
> + mask = pmask(pll, PLL_PREDIV);
> + index = pindex(pll, PLL_PREDIV);
> + width = pwidth(pll, PLL_PREDIV);
> + if (width && (ccu_pll_readl(pll, index) & mask))
> + refin = refin * 2;
> +
> + mask = pmask(pll, PLL_POSTDIV);
> + index = pindex(pll, PLL_POSTDIV);
> + width = pwidth(pll, PLL_POSTDIV);
> + cfg[index].msk = mask;
> + if (width && ((pll->fflag == 1 && fvco <= pll->fvco) ||
> + (pll->fflag == 0 && fvco > pll->fvco)))
> + cfg[index].val |= mask;
> +
> + if (width && fvco <= pll->fvco)
> + fvco = fvco * 2;
> +
> + mask = pmask(pll, PLL_DIV_S);
> + index = pindex(pll, PLL_DIV_S);
> + cfg[index].val |= mask;
> + cfg[index].msk |= mask;
> +
> + mask = pmask(pll, PLL_SDM_EN);
> + index = pindex(pll, PLL_SDM_EN);
> + cfg[index].val |= mask;
> + cfg[index].msk |= mask;
> +
> + nint = fvco/(refin * CCU_PLL_1M);
> +
> + mask = pmask(pll, PLL_NINT);
> + index = pindex(pll, PLL_NINT);
> + shift = pshift(pll, PLL_NINT);
> + cfg[index].val |= (nint << shift) & mask;
> + cfg[index].msk |= mask;
> +
> + mask = pmask(pll, PLL_KINT);
> + index = pindex(pll, PLL_KINT);
> + width = pwidth(pll, PLL_KINT);
> + shift = pshift(pll, PLL_KINT);
> +#ifndef CONFIG_64BIT
> + i = width < 21 ? 0 : i - 21;
> +#endif
What's this? Why do we depend on CONFIG_64BIT?
> + kint = DIV_ROUND_CLOSEST(((fvco - refin * nint * CCU_PLL_1M)/10000) *
> + ((mask >> (shift + i)) + 1), refin * 100) << i;
> + cfg[index].val |= (kint << shift) & mask;
> + cfg[index].msk |= mask;
> +
> + ibias_val = pll_get_ibias(fvco, pll->itable);
> +
> + mask = pmask(pll, PLL_IBIAS);
> + index = pindex(pll, PLL_IBIAS);
> + shift = pshift(pll, PLL_IBIAS);
> + cfg[index].val |= ibias_val << shift & mask;
> + cfg[index].msk |= mask;
> +
> + for (i = 0; i < reg_num; i++) {
> + if (cfg[i].msk)
> + ccu_pll_writel(pll, i, cfg[i].val, cfg[i].msk);
> + }
> +
Are we waiting for the writel() to go through above? If so we
need a readl() of the same register to make sure the write has
completed before delaying.
> + udelay(pll->udelay);
> +
> + return 0;
> +}
> +
> +static unsigned long ccu_pll_recalc_rate(struct clk_hw *hw,
> + unsigned long parent_rate)
> +{
> + struct ccu_pll *pll = hw_to_ccu_pll(hw);
> +
> + return ccu_pll_helper_recalc_rate(pll, parent_rate);
> +}
> +
> +static int ccu_pll_set_rate(struct clk_hw *hw,
> + unsigned long rate,
> + unsigned long parent_rate)
> +{
> + struct ccu_pll *pll = hw_to_ccu_pll(hw);
> +
> + return ccu_pll_helper_set_rate(pll, rate, parent_rate);
> +}
> +
> +static int ccu_pll_clk_prepare(struct clk_hw *hw)
> +{
> + struct ccu_pll *pll = hw_to_ccu_pll(hw);
> +
> + udelay(pll->udelay);
> +
> + return 0;
> +}
> +
> +static long ccu_pll_round_rate(struct clk_hw *hw, unsigned long rate,
> + unsigned long *prate)
> +{
> + return rate;
> +}
> +
> +const struct clk_ops ccu_pll_ops = {
> + .prepare = ccu_pll_clk_prepare,
> + .recalc_rate = ccu_pll_recalc_rate,
> + .round_rate = ccu_pll_round_rate,
> + .set_rate = ccu_pll_set_rate,
> +};
> diff --git a/drivers/clk/sprd/ccu_pll.h b/drivers/clk/sprd/ccu_pll.h
> new file mode 100644
> index 0000000..66fe5d1
> --- /dev/null
> +++ b/drivers/clk/sprd/ccu_pll.h
> @@ -0,0 +1,123 @@
> +/*
> + * Spreadtrum clock pll configurations
> + *
> + * Copyright (C) 2015~2017 Spreadtrum, Inc.
> + *
> + * SPDX-License-Identifier: GPL-2.0
> + */
> +
> +#ifndef _CCU_PLL_H_
> +#define _CCU_PLL_H_
> +
> +#include "ccu_common.h"
> +
> +struct reg_cfg {
> + u32 val;
> + u32 msk;
> +};
> +
> +struct ccu_bit_field {
> + u8 shift;
> + u8 width;
> +};
> +
> +enum {
> + PLL_LOCK_DONE = 0,
Drop the = 0 please unless it's needed for something?
> + PLL_DIV_S,
> + PLL_MOD_EN,
> + PLL_SDM_EN,
> + PLL_REFIN,
> + PLL_IBIAS,
> + PLL_N,
> + PLL_NINT,
> + PLL_KINT,
> + PLL_PREDIV,
> + PLL_POSTDIV,
> +
> + PLL_FACT_MAX
> +};
> +
> +/*
> + * struct ccu_pll - defination of adjustable pll clock
s/defination/definition/
> + *
> + * @reg: registers used to set the configuration of pll clock,
> + * reg[0] shows how many registers this pll clock uses.
> + * @itable: pll ibias table, itable[0] means how many items this
> + * table includes
> + * @udelay delay time after setting rate
> + * @factors used to calculate the pll clock rate
> + * @fvco: fvco threshold rate
> + * @fflag: fvco flag
> + */
> +struct ccu_pll {
> + const u32 *regs;
> + const u64 *itable;
> + u16 udelay;
> + const struct ccu_bit_field *factors;
Does this change across the different PLLs? Would be nice to not
need the bit field thing.
> + u64 fvco;
> + u16 fflag;
> +
> + struct ccu_common common;
--
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