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Peng, I'll wait for these comments to be addressed then. > > On Wed, Feb 23, 2022 at 02:43:57PM +0800, Peng Fan (OSS) wrote: > > From: Peng Fan > > > > This PLL module is a Fractional-N synthesizer, > > supporting 30-bit numerator and denominator. Numerator is a signed > > number. It has feature to adjust fractional portion of feedback > > divider dynamically. This fracn gppll is used in i.MX93. > > > > Signed-off-by: Peng Fan > > --- > > drivers/clk/imx/Makefile | 1 + > > drivers/clk/imx/clk-fracn-gppll.c | 328 ++++++++++++++++++++++++++++++ > > drivers/clk/imx/clk.h | 21 ++ > > 3 files changed, 350 insertions(+) > > create mode 100644 drivers/clk/imx/clk-fracn-gppll.c > > > > diff --git a/drivers/clk/imx/Makefile b/drivers/clk/imx/Makefile > > index 36c04922d789..60c8a4bb7574 100644 > > --- a/drivers/clk/imx/Makefile > > +++ b/drivers/clk/imx/Makefile > > @@ -5,6 +5,7 @@ mxc-clk-objs += clk-busy.o > > mxc-clk-objs += clk-composite-7ulp.o > > mxc-clk-objs += clk-composite-8m.o > > mxc-clk-objs += clk-composite-93.o > > +mxc-clk-objs += clk-fracn-gppll.o > > mxc-clk-objs += clk-cpu.o > > mxc-clk-objs += clk-divider-gate.o > > mxc-clk-objs += clk-fixup-div.o > > diff --git a/drivers/clk/imx/clk-fracn-gppll.c b/drivers/clk/imx/clk-fracn-gppll.c > > new file mode 100644 > > index 000000000000..6c9946a4bdb7 > > --- /dev/null > > +++ b/drivers/clk/imx/clk-fracn-gppll.c > > @@ -0,0 +1,328 @@ > > +// SPDX-License-Identifier: GPL-2.0 > > +/* > > + * Copyright 2021 NXP > > + */ > > + > > +#include > > +#include > > +#include > > +#include > > +#include > > +#include > > +#include > > +#include > > + > > +#include "clk.h" > > + > > +#define PLL_CTRL 0x0 > > +#define CLKMUX_BYPASS BIT(2) > > +#define CLKMUX_EN BIT(1) > > +#define POWERUP_MASK BIT(0) > > + > > +#define PLL_ANA_PRG 0x10 > > +#define PLL_SPREAD_SPECTRUM 0x30 > > + > > +#define PLL_NUMERATOR 0x40 > > +#define PLL_MFN_MASK GENMASK(31, 2) > > +#define PLL_MFN_SHIFT 2 > > + > > +#define PLL_DENOMINATOR 0x50 > > +#define PLL_MFD_MASK GENMASK(29, 0) > > + > > +#define PLL_DIV 0x60 > > +#define PLL_MFI_MASK GENMASK(24, 16) > > +#define PLL_MFI_SHIFT 16 > > +#define PLL_RDIV_MASK GENMASK(15, 13) > > +#define PLL_RDIV_SHIFT 13 > > +#define PLL_ODIV_MASK GENMASK(7, 0) > > + > > +#define PLL_DFS_CTRL(x) (0x70 + (x) * 0x10) > > + > > +#define PLL_STATUS 0xF0 > > +#define LOCK_STATUS BIT(0) > > + > > +#define DFS_STATUS 0xF4 > > + > > +#define LOCK_TIMEOUT_US 200 > > + > > +#define PLL_FRACN_GP(_rate, _mfi, _mfn, _mfd, _rdiv, _odiv) \ > > + { \ > > + .rate = (_rate), \ > > + .mfi = (_mfi), \ > > + .mfn = (_mfn), \ > > + .mfd = (_mfd), \ > > + .rdiv = (_rdiv), \ > > + .odiv = (_odiv), \ > > + } > > + > > +struct clk_fracn_gppll { > > + struct clk_hw hw; > > + void __iomem *base; > > + const struct imx_fracn_gppll_rate_table *rate_table; > > + int rate_count; > > +}; > > + > > +#define to_clk_fracn_gppll(_hw) container_of(_hw, struct clk_fracn_gppll, hw) > > Consider using a static inline function instead. > > > + > > +/* > > + * Fvco = 𝐹𝑟𝑒𝑓∙(𝑀𝐹𝐼+𝑀𝐹𝑁/𝑀𝐹𝐷) > > + * Fout = Fvco / (rdiv * odiv) > > + */ > > +static const struct imx_fracn_gppll_rate_table fracn_tbl[] = { > > + PLL_FRACN_GP(650000000U, 81, 0, 0, 0, 3), > > + PLL_FRACN_GP(594000000U, 198, 0, 0, 0, 8), > > + PLL_FRACN_GP(560000000U, 70, 0, 0, 0, 3), > > + PLL_FRACN_GP(400000000U, 50, 0, 0, 0, 3), > > + PLL_FRACN_GP(393216000U, 81, 92, 100, 0, 5) > > +}; > > + > > +struct imx_fracn_gppll_clk imx_fracn_gppll = { > > + .rate_table = fracn_tbl, > > + .rate_count = ARRAY_SIZE(fracn_tbl), > > +}; > > +EXPORT_SYMBOL_GPL(imx_fracn_gppll); > > + > > +static const struct imx_fracn_gppll_rate_table * > > +imx_get_pll_settings(struct clk_fracn_gppll *pll, unsigned long rate) > > +{ > > + const struct imx_fracn_gppll_rate_table *rate_table = pll->rate_table; > > + int i; > > + > > + for (i = 0; i < pll->rate_count; i++) > > + if (rate == rate_table[i].rate) > > + return &rate_table[i]; > > + > > + return NULL; > > +} > > + > > +static long clk_fracn_gppll_round_rate(struct clk_hw *hw, unsigned long rate, > > + unsigned long *prate) > > +{ > > + struct clk_fracn_gppll *pll = to_clk_fracn_gppll(hw); > > + const struct imx_fracn_gppll_rate_table *rate_table = pll->rate_table; > > + int i; > > + > > + /* Assumming rate_table is in descending order */ > > s/Assumming/Assuming/ > > > + for (i = 0; i < pll->rate_count; i++) > > + if (rate >= rate_table[i].rate) > > + return rate_table[i].rate; > > + > > + if (i == pll->rate_count) > > This is always true when you're here, > > > + pr_err("Not able to round rate for %s: %lu\n", clk_hw_get_name(hw), rate); > > but this message shouldn't be needed at all. When a rate is passed in > here that is too low then the driver should silently round up to the > lowest supported rate. > > > + > > + /* return minimum supported value */ > > + return rate_table[i - 1].rate; > > IMO rate_table[pll->rate_count - 1].rate makes it clearer what is meant > here. > > > +} > > + > > +static unsigned long clk_fracn_gppll_recalc_rate(struct clk_hw *hw, unsigned long parent_rate) > > +{ > > + struct clk_fracn_gppll *pll = to_clk_fracn_gppll(hw); > > + const struct imx_fracn_gppll_rate_table *rate_table = pll->rate_table; > > + u32 pll_numerator, pll_denominator, pll_div; > > + u32 mfi, mfn, mfd, rdiv, odiv; > > + u64 fvco = parent_rate; > > + long rate = 0; > > + int i; > > + > > + pll_numerator = readl_relaxed(pll->base + PLL_NUMERATOR); > > + mfn = (pll_numerator & PLL_MFN_MASK) >> PLL_MFN_SHIFT; > > Have a look at FIELD_GET/FIELD_PREP, it really makes setting and reading > fields easier and nicer to look at. > > > + > > + pll_denominator = readl_relaxed(pll->base + PLL_DENOMINATOR); > > + mfd = pll_denominator & PLL_MFD_MASK; > > + > > + pll_div = readl_relaxed(pll->base + PLL_DIV); > > + mfi = (pll_div & PLL_MFI_MASK) >> PLL_MFI_SHIFT; > > + > > + rdiv = (pll_div & PLL_RDIV_MASK) >> PLL_RDIV_SHIFT; > > + rdiv = rdiv + 1; > > + odiv = pll_div & PLL_ODIV_MASK; > > + switch (odiv) { > > + case 0: > > + odiv = 2; > > + break; > > + case 1: > > + odiv = 3; > > + break; > > + default: > > + break; > > + } > > + > > + /* > > + * Sometimes, the recalculated rate has deviation due to > > + * the frac part. So find the accurate pll rate from the table > > + * first, if no match rate in the table, use the rate calculated > > + * from the equation below. > > + */ > > + for (i = 0; i < pll->rate_count; i++) { > > + if (rate_table[i].mfn == mfn && rate_table[i].mfi == mfi && > > + rate_table[i].mfd == mfd && rate_table[i].rdiv == rdiv && > > + rate_table[i].odiv == odiv) > > + rate = rate_table[i].rate; > > + } > > + > > + /* Fvco = 𝐹𝑟𝑒𝑓∙(𝑀𝐹𝐼+𝑀𝐹𝑁/𝑀𝐹𝐷) */ > > + fvco = fvco * mfi + fvco * mfn / mfd; > > + > > + do_div(fvco, rdiv * odiv); > > + > > + return rate ? (unsigned long) rate : (unsigned long)fvco; > > You could bail out early here instead of calculating fvco which you then > don't use. > > > +} > > + > > +static int clk_fracn_gppll_wait_lock(struct clk_fracn_gppll *pll) > > +{ > > + u32 val; > > + > > + return readl_poll_timeout(pll->base + PLL_STATUS, val, > > + val & LOCK_STATUS, 0, LOCK_TIMEOUT_US); > > +} > > + > > +static int clk_fracn_gppll_set_rate(struct clk_hw *hw, unsigned long drate, > > + unsigned long prate) > > +{ > > + struct clk_fracn_gppll *pll = to_clk_fracn_gppll(hw); > > + const struct imx_fracn_gppll_rate_table *rate; > > + u32 tmp, pll_div, ana_mfn; > > + int ret; > > + > > + rate = imx_get_pll_settings(pll, drate); > > + if (!rate) { > > + pr_err("%s: Invalid rate : %lu for pll clk %s\n", __func__, > > + drate, clk_hw_get_name(hw)); > > + return -EINVAL; > > + } > > The core does a round_rate() before doing a set_rate(), so this should > never happen. I think this can be dropped, in doubt the resulting NULL > pointer deref provides enough developer information to debug this > internal error. > > > + > > + /* Disable output */ > > + tmp = readl_relaxed(pll->base + PLL_CTRL); > > + tmp &= ~CLKMUX_EN; > > + writel_relaxed(tmp, pll->base + PLL_CTRL); > > + > > + /* Power Down */ > > + tmp &= ~POWERUP_MASK; > > + writel_relaxed(tmp, pll->base + PLL_CTRL); > > + > > + /* Disable BYPASS */ > > + tmp &= ~CLKMUX_BYPASS; > > + writel_relaxed(tmp, pll->base + PLL_CTRL); > > + > > + pll_div = (rate->rdiv << PLL_RDIV_SHIFT) | rate->odiv | (rate->mfi << PLL_MFI_SHIFT); > > + writel_relaxed(pll_div, pll->base + PLL_DIV); > > + writel_relaxed(rate->mfd, pll->base + PLL_DENOMINATOR); > > + writel_relaxed(rate->mfn << PLL_MFN_SHIFT, pll->base + PLL_NUMERATOR); > > + > > + /* Wait for 5us according to fracn mode pll doc */ > > + udelay(5); > > + > > + /* Enable Powerup */ > > + tmp |= POWERUP_MASK; > > + writel_relaxed(tmp, pll->base + PLL_CTRL); > > + > > + /* Wait Lock*/ > > Nitpick: Space missing at end of comment. > > > + ret = clk_fracn_gppll_wait_lock(pll); > > + if (ret) > > + return ret; > > + > > + /* Enable output */ > > + tmp |= CLKMUX_EN; > > + writel_relaxed(tmp, pll->base + PLL_CTRL); > > + > > + ana_mfn = (readl_relaxed(pll->base + PLL_STATUS) & PLL_MFN_MASK) >> PLL_MFN_SHIFT; > > + > > + WARN(ana_mfn != rate->mfn, "ana_mfn != rate->mfn\n"); > > + > > + return 0; > > +} > > + > > +static int clk_fracn_gppll_prepare(struct clk_hw *hw) > > +{ > > + struct clk_fracn_gppll *pll = to_clk_fracn_gppll(hw); > > + u32 val; > > + int ret; > > + > > + val = readl_relaxed(pll->base + PLL_CTRL); > > + if (val & POWERUP_MASK) > > + return 0; > > + > > + val |= CLKMUX_BYPASS; > > + writel_relaxed(val, pll->base + PLL_CTRL); > > + > > + val |= POWERUP_MASK; > > + writel_relaxed(val, pll->base + PLL_CTRL); > > + > > + val |= CLKMUX_EN; > > + writel_relaxed(val, pll->base + PLL_CTRL); > > + > > + ret = clk_fracn_gppll_wait_lock(pll); > > + if (ret) > > + return ret; > > + > > + val &= ~CLKMUX_BYPASS; > > + writel_relaxed(val, pll->base + PLL_CTRL); > > + > > + return 0; > > +} > > + > > +static int clk_fracn_gppll_is_prepared(struct clk_hw *hw) > > +{ > > + struct clk_fracn_gppll *pll = to_clk_fracn_gppll(hw); > > + u32 val; > > + > > + val = readl_relaxed(pll->base + PLL_CTRL); > > + > > + return (val & POWERUP_MASK) ? 1 : 0; > > +} > > + > > +static void clk_fracn_gppll_unprepare(struct clk_hw *hw) > > +{ > > + struct clk_fracn_gppll *pll = to_clk_fracn_gppll(hw); > > + u32 val; > > + > > + val = readl_relaxed(pll->base + PLL_CTRL); > > + val &= ~POWERUP_MASK; > > + writel_relaxed(val, pll->base + PLL_CTRL); > > +} > > + > > +static const struct clk_ops clk_fracn_gppll_ops = { > > + .prepare = clk_fracn_gppll_prepare, > > + .unprepare = clk_fracn_gppll_unprepare, > > + .is_prepared = clk_fracn_gppll_is_prepared, > > + .recalc_rate = clk_fracn_gppll_recalc_rate, > > + .round_rate = clk_fracn_gppll_round_rate, > > + .set_rate = clk_fracn_gppll_set_rate, > > +}; > > + > > +struct clk_hw *imx_clk_fracn_gppll(const char *name, const char *parent_name, void __iomem *base, > > + const struct imx_fracn_gppll_clk *pll_clk) > > +{ > > + struct clk_fracn_gppll *pll; > > + struct clk_hw *hw; > > + struct clk_init_data init; > > + int ret; > > + u32 val; > > + > > + pll = kzalloc(sizeof(*pll), GFP_KERNEL); > > + if (!pll) > > + return ERR_PTR(-ENOMEM); > > + > > + init.name = name; > > + init.flags = pll_clk->flags; > > + init.parent_names = &parent_name; > > + init.num_parents = 1; > > + init.ops = &clk_fracn_gppll_ops; > > + > > + pll->base = base; > > + pll->hw.init = &init; > > + pll->rate_table = pll_clk->rate_table; > > + pll->rate_count = pll_clk->rate_count; > > + > > + hw = &pll->hw; > > + > > + ret = clk_hw_register(NULL, hw); > > + if (ret) { > > + pr_err("%s: failed to register pll %s %d\n", __func__, name, ret); > > + kfree(pll); > > + return ERR_PTR(ret); > > + } > > + > > + return hw; > > +} > > +EXPORT_SYMBOL_GPL(imx_clk_fracn_gppll); > > diff --git a/drivers/clk/imx/clk.h b/drivers/clk/imx/clk.h > > index 63eb7c53b123..a7cbbcd1a3f4 100644 > > --- a/drivers/clk/imx/clk.h > > +++ b/drivers/clk/imx/clk.h > > @@ -72,6 +72,27 @@ extern struct imx_pll14xx_clk imx_1416x_pll; > > extern struct imx_pll14xx_clk imx_1443x_pll; > > extern struct imx_pll14xx_clk imx_1443x_dram_pll; > > > > +/* NOTE: Rate table should be kept sorted in descending order. */ > > +struct imx_fracn_gppll_rate_table { > > + unsigned int rate; > > + unsigned int mfi; > > + unsigned int mfn; > > + unsigned int mfd; > > + unsigned int rdiv; > > + unsigned int odiv; > > +}; > > + > > +struct imx_fracn_gppll_clk { > > + const struct imx_fracn_gppll_rate_table *rate_table; > > + int rate_count; > > + int flags; > > +}; > > + > > +struct clk_hw *imx_clk_fracn_gppll(const char *name, const char *parent_name, void __iomem *base, > > + const struct imx_fracn_gppll_clk *pll_clk); > > + > > +extern struct imx_fracn_gppll_clk imx_fracn_gppll; > > + > > #define imx_clk_cpu(name, parent_name, div, mux, pll, step) \ > > to_clk(imx_clk_hw_cpu(name, parent_name, div, mux, pll, step)) > > > > -- > > 2.25.1 > > > > > > -- > Pengutronix e.K. | | > Steuerwalder Str. 21 | http://www.pengutronix.de/ | > 31137 Hildesheim, Germany | Phone: +49-5121-206917-0 | > Amtsgericht Hildesheim, HRA 2686 | Fax: +49-5121-206917-5555 | From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id D75DDC433F5 for ; Wed, 23 Feb 2022 10:49:48 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20210309; h=Sender: 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