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SubjectRe: [RFC PATCH 2/2] clk: mediatek: Add frequency hopping support
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Hi AngeloGioacchino,

Thanks for all the advices.

On Mon, 2022-06-13 at 17:43 +0800, AngeloGioacchino Del Regno wrote:
> Il 12/06/22 15:54, Johnson Wang ha scritto:
> > Add frequency hopping support and spread spectrum clocking
> > control for MT8186.
> >
> > Signed-off-by: Edward-JW Yang <edward-jw.yang@mediatek.com>
> > Signed-off-by: Johnson Wang <johnson.wang@mediatek.com>
>
> Before going on with the review, there's one important consideration:
> the Frequency Hopping control is related to PLLs only (so, no other clock
> types get in the mix).
>
> Checking the code, the *main* thing that we do here is initializing the
> FHCTL by setting some registers, and we're performing the actual frequency
> hopping operation in clk-pll, which is right but, at this point, I think
> that the best way to proceed is to add the "FHCTL superpowers" to clk-pll
> itself, instead of adding multiple new files and devicetree bindings that
> are specific to the FHCTL itself.
>
> This would mean that the `fh-id` and `perms` params that you're setting in
> the devicetree get transferred to clk-mt8186 (and hardcoded there), as to
> extend the PLL declarations to include these two: that will also simplify
> the driver so that you won't have to match names here and there.
>
> Just an example:
>
> PLL(CLK_APMIXED_CCIPLL, "ccipll", 0x0224, 0x0230, 0,
>
> PLL_AO, 0, 22, 0x0228, 24, 0, 0, 0, 0x0228, 2, FHCTL_PERM_DBG_DUMP),
>
> Besides, there are another couple of reasons why you should do that instead,
> of which:
> - The devicetree should be "generic enough", we shall not see the direct value
> to write to the registers in there (yet, perms assigns exactly that)
> - These values won't change on a per-device basis, I believe? They're SoC-related,
> not board-related, right?
>
> In case they're board related (and/or related to TZ permissions), we can always add
> a bool property to the apmixedsys to advertise that board X needs to use an
> alternative permission (ex.: `mediatek,secure-fhctl`).

I think we should remain clk-fhctl files because FHCTL is a independent HW and is
not a necessary component of clk-pll.
Frequency hopping function from FHCTL is not used to replace original flow of
set_rate in clk-pll. They are two different ways to change PLL's frequency. The
current set_rate method in clk-pll changes PLL register setting directly. Another
way uses FHCTL to change PLL rate. We will set some PLL's frequency be controlled
by clk-pll and some are controlled by FHCTL. And use `perms` param to decide
whether a PLL is using FHCTL to change its frequency.

FHCTL has another function called SSC(spread spectrum clocking) which is used to
solve PLL de-sense problem. De-sense problem is board-related so we introduce a
`ssc-rate` param in the devicetree to decide whether SSC is enabled and how many
rate should be set. Mixing SSC function into clk-pll may cause clk-pll more
complex.

>
> In any case, to speed up development (I believe that transferring this in clk-pll
> means that the code will still be more or less the same), I've performed a review
> on the code; check below.
>
> > ---
> > drivers/clk/mediatek/Kconfig | 8 +
> > drivers/clk/mediatek/Makefile | 2 +
> > drivers/clk/mediatek/clk-fhctl-ap.c | 347 ++++++++++++++++++++++++++
> > drivers/clk/mediatek/clk-fhctl-pll.c | 209 ++++++++++++++++
> > drivers/clk/mediatek/clk-fhctl-pll.h | 74 ++++++
> > drivers/clk/mediatek/clk-fhctl-util.h | 24 ++
> > drivers/clk/mediatek/clk-fhctl.c | 191 ++++++++++++++
> > drivers/clk/mediatek/clk-fhctl.h | 45 ++++
> > drivers/clk/mediatek/clk-pll.c | 5 +-
> > drivers/clk/mediatek/clk-pll.h | 5 +
> > 10 files changed, 909 insertions(+), 1 deletion(-)
> > create mode 100644 drivers/clk/mediatek/clk-fhctl-ap.c
> > create mode 100644 drivers/clk/mediatek/clk-fhctl-pll.c
> > create mode 100644 drivers/clk/mediatek/clk-fhctl-pll.h
> > create mode 100644 drivers/clk/mediatek/clk-fhctl-util.h
> > create mode 100644 drivers/clk/mediatek/clk-fhctl.c
> > create mode 100644 drivers/clk/mediatek/clk-fhctl.h
> >
> > diff --git a/drivers/clk/mediatek/Kconfig b/drivers/clk/mediatek/Kconfig
> > index d5936cfb3bee..fd887c537a91 100644
> > --- a/drivers/clk/mediatek/Kconfig
> > +++ b/drivers/clk/mediatek/Kconfig
> > @@ -622,4 +622,12 @@ config COMMON_CLK_MT8516_AUDSYS
> > help
> > This driver supports MediaTek MT8516 audsys clocks.
> >
> > +config COMMON_CLK_MTK_FREQ_HOPPING
> > + tristate "MediaTek frequency hopping driver"
>
> If this goes inside of clk-pll, this configuration option can be safely removed.

I think we should keep this for clk-fhctl* files.

>
> > + depends on ARCH_MEDIATEK || COMPILE_TEST
> > + select COMMON_CLK_MEDIATEK
> > + help
> > + This driver supports frequency hopping and spread spectrum clocking
> > + control for some MediaTek SoCs.
> > +
> > endmenu
> > diff --git a/drivers/clk/mediatek/Makefile b/drivers/clk/mediatek/Makefile
> > index caf2ce93d666..3c0e9bd3978b 100644
> > --- a/drivers/clk/mediatek/Makefile
> > +++ b/drivers/clk/mediatek/Makefile
> > @@ -99,3 +99,5 @@ obj-$(CONFIG_COMMON_CLK_MT8195) += clk-mt8195-apmixedsys.o clk-mt8195-topckgen.o
> > clk-mt8195-apusys_pll.o
> > obj-$(CONFIG_COMMON_CLK_MT8516) += clk-mt8516.o
> > obj-$(CONFIG_COMMON_CLK_MT8516_AUDSYS) += clk-mt8516-aud.o
> > +obj-$(CONFIG_COMMON_CLK_MTK_FREQ_HOPPING) += fhctl.o
> > +fhctl-objs += clk-fhctl.o clk-fhctl-ap.o clk-fhctl-pll.o
> > diff --git a/drivers/clk/mediatek/clk-fhctl-ap.c b/drivers/clk/mediatek/clk-fhctl-ap.c
> > new file mode 100644
> > index 000000000000..9e3226a9c1ca
> > --- /dev/null
> > +++ b/drivers/clk/mediatek/clk-fhctl-ap.c
> > @@ -0,0 +1,347 @@
> > +// SPDX-License-Identifier: GPL-2.0
> > +/*
> > + * Copyright (c) 2022 MediaTek Inc.
> > + */
> > +
> > +#include <linux/device.h>
> > +#include <linux/module.h>
> > +#include <linux/of.h>
> > +#include <linux/of_address.h>
> > +#include <linux/of_device.h>
> > +#include <linux/platform_device.h>
> > +#include <linux/string.h>
> > +#include <linux/slab.h>
> > +#include "clk-fhctl.h"
> > +#include "clk-fhctl-pll.h"
> > +#include "clk-fhctl-util.h"
> > +
> > +#define FHCTL_TARGET FHCTL_AP
> > +
> > +#define PERCENT_TO_DDSLMT(dds, percent_m10) \
> > + ((((dds) * (percent_m10)) >> 5) / 100)
> > +
> > +struct fh_ap_match {
> > + char *name;
> > + struct fh_hdlr *hdlr;
> > + int (*init)(struct pll_dts *array, struct fh_ap_match *match);
> > +};
> > +
> > +struct hdlr_data {
> > + struct pll_dts *array;
> > + struct fh_pll_domain *domain;
> > + spinlock_t *lock;
> > +};
> > +
> > +static int fhctl_set_ssc_regs(struct fh_pll_regs *regs,
> > + struct fh_pll_data *data,
> > + int fh_id, int rate)
> > +{
> > + unsigned int updnlmt_val;
> > +
> > + if (rate > 0) {
> > + fh_set_field(regs->reg_cfg, data->frddsx_en, 0);
> > + fh_set_field(regs->reg_cfg, data->sfstrx_en, 0);
> > + fh_set_field(regs->reg_cfg, data->fhctlx_en, 0);
>
> Are all of these writes to be performed with a barrier?
> Can't we use writel_relaxed() for some, with a "final" writel() where ordering
> *really* matters?

Do this mean use writel_relaxed() on the first two and writel() on the thrid?

>
> Also, at least these three field settings are common between (rate > 0) and
> (rate <= 0), so they can go outside of the conditional.

OK, we will move them to outside of conditional. Thanks.

>
> > +
> > + /* Set the relative parameter registers (dt/df/upbnd/downbnd) */
> > + fh_set_field(regs->reg_cfg, data->msk_frddsx_dys, data->df_val);
> > + fh_set_field(regs->reg_cfg, data->msk_frddsx_dts, data->dt_val);
> > +
> > + writel((readl(regs->reg_con_pcw) & data->dds_mask) |
> > + data->tgl_org, regs->reg_dds);
> > +
> > + /* Calculate UPDNLMT */
> > + updnlmt_val = PERCENT_TO_DDSLMT((readl(regs->reg_dds) &
> > + data->dds_mask), rate) <<
> > + data->updnlmt_shft;
> > +
> > + writel(updnlmt_val, regs->reg_updnlmt);
> > +
> > + fh_set_field(regs->reg_hp_en, BIT(fh_id), 1);
> > +
> > + /* Enable SSC */
> > + fh_set_field(regs->reg_cfg, data->frddsx_en, 1);
> > + /* Enable Hopping control */
> > + fh_set_field(regs->reg_cfg, data->fhctlx_en, 1);
> > +
> > + } else {
> > + fh_set_field(regs->reg_cfg, data->frddsx_en, 0);
> > + fh_set_field(regs->reg_cfg, data->sfstrx_en, 0);
> > + fh_set_field(regs->reg_cfg, data->fhctlx_en, 0);
> > +
> > + /* Switch to APMIXEDSYS control */
> > + fh_set_field(regs->reg_hp_en, BIT(fh_id), 0);
> > +
> > + /* Wait for DDS to be stable */
> > + udelay(30);
> > + }
> > +
> > + return 0;
> > +}
> > +
> > +static int hopping_hw_flow(void *priv_data, char *domain_name, int fh_id,
> > + unsigned int new_dds, int postdiv)
> > +{
> > + struct fh_pll_domain *domain;
> > + struct fh_pll_regs *regs;
> > + struct fh_pll_data *data;
> > + unsigned int dds_mask;
> > + unsigned int mon_dds = 0;
> > + int ret = 0;
> > + unsigned int con_pcw_tmp;
> > + struct hdlr_data *d = (struct hdlr_data *)priv_data;
> > + struct pll_dts *array = d->array;
> > +
> > + domain = d->domain;
> > + regs = &domain->regs[fh_id];
> > + data = &domain->data[fh_id];
> > + dds_mask = data->dds_mask;
>
> Just perform these assignments in the variable declarations... with some
> reordering as well, and drop the zero assignment to ret.
>
> In few words:
>
> struct hdlr_data *d = (struct hdlr_data *)priv_data;
>
> struct fh_pll_domain *domain = d->domain;
>
> struct fh_pll_regs *regs = &domain->regs[fh_id];
>
> struct fh_pll_data *data = &domain->data[fh_id];
>
> struct pll_dts *array = d->array;
>
> u32 con_pcw_tmp, dds_mask;
>
> u32 mon_dds = 0;
>
> int ret;
>
> This comment is valid for some other functions as well - I won't repeat
> this for every instance... :-)

OK, we will merge them. Thanks.

>
> > +
> > + if (array->ssc_rate)
> > + fhctl_set_ssc_regs(regs, data, fh_id, 0);
> > +
> > + writel((readl(regs->reg_con_pcw) & dds_mask) |
> > + data->tgl_org, regs->reg_dds);
> > +
> > + fh_set_field(regs->reg_cfg, data->sfstrx_en, 1);
> > + fh_set_field(regs->reg_cfg, data->fhctlx_en, 1);
> > + writel(data->slope0_value, regs->reg_slope0);
> > + writel(data->slope1_value, regs->reg_slope1);
> > +
> > + fh_set_field(regs->reg_hp_en, BIT(fh_id), 1);
> > + writel((new_dds) | (data->dvfs_tri), regs->reg_dvfs);
> > +
> > + /* Wait 1000 us until DDS stable */
> > + ret = readl_poll_timeout_atomic(regs->reg_mon, mon_dds,
> > + (mon_dds & dds_mask) == new_dds, 10, 1000);
>
> Why are you writing to CON_PCW even when this returns en error?
> Please add a comment explaining the reasons.

Oh, we will add a warning log and dump HW register when this returns an error
The reg_mon is a register reflects the current frequency rate. So, it's fine to
write the current rate back to CON_PCW. We will also add a comment on it. Thanks

>
> > +
> > + con_pcw_tmp = readl(regs->reg_con_pcw) & (~dds_mask);
> > + con_pcw_tmp = (con_pcw_tmp | (readl(regs->reg_mon) & dds_mask) |
> > + data->pcwchg);
> > +
> > + writel(con_pcw_tmp, regs->reg_con_pcw);
> > +
> > + fh_set_field(regs->reg_hp_en, BIT(fh_id), 0);
> > +
> > + if (array->ssc_rate)
> > + fhctl_set_ssc_regs(regs, data, fh_id, array->ssc_rate);
> > +
> > + return ret;
> > +}
> > +
> > +static unsigned int __get_postdiv(struct fh_pll_regs *regs,
> > + struct fh_pll_data *data)
> > +{
> > + unsigned int regval;
> > +
> > + regval = (readl(regs->reg_con_postdiv) & data->postdiv_mask)
> > + >> data->postdiv_offset;
> > +
> > + return data->postdiv_table[regval];
>
> Can we instead simply reuse `struct clk_div_table` from clk-provider.h?

"postdiv" is part of setting in PCW_CON, not a individual clk divider. I think
it's not suitable to use `struct clk_div_table` here.

>
> > +}
> > +
> > +static void __set_postdiv(struct fh_pll_regs *regs, struct fh_pll_data *data,
> > + int postdiv)
> > +{
> > + unsigned int regval, temp;
> > +
> > + for (regval = 0 ; regval < data->postdiv_table_size ; regval++) {
> > + if (data->postdiv_table[regval] > postdiv) {
> > + regval--;
> > + break;
> > + }
> > + }
> > +
> > + temp = (readl(regs->reg_con_postdiv)) & ~(data->postdiv_mask);
> > + temp |= regval << data->postdiv_offset;
> > + writel(temp, regs->reg_con_postdiv);
> > +}
> > +
> > +static int fhctl_ap_hopping(void *priv_data, char *domain_name, int fh_id,
> > + unsigned int new_dds, int postdiv)
> > +{
> > + struct fh_pll_domain *domain;
> > + struct fh_pll_regs *regs;
> > + struct fh_pll_data *data;
> > + int ret = 0;
> > + struct hdlr_data *d = (struct hdlr_data *)priv_data;
> > + spinlock_t *lock = d->lock;
> > + unsigned long flags = 0;
> > + unsigned int pll_postdiv;
> > +
> > + domain = d->domain;
> > + regs = &domain->regs[fh_id];
> > + data = &domain->data[fh_id];
> > +
> > + if (postdiv > 0) {
> > + pll_postdiv = __get_postdiv(regs, data);
> > +
> > + if (postdiv > pll_postdiv)
> > + __set_postdiv(regs, data, postdiv);
> > + }
> > +
> > + spin_lock_irqsave(lock, flags);
> > +
> > + ret = hopping_hw_flow(priv_data, domain_name, fh_id, new_dds, postdiv);
> > +
> > + spin_unlock_irqrestore(lock, flags);
> > +
> > + if (postdiv > 0) {
> > + if (postdiv < pll_postdiv)
> > + __set_postdiv(regs, data, postdiv);
> > + }
> > +
> > + return ret;
> > +}
> > +
> > +static int fhctl_ap_ssc_enable(void *priv_data, char *domain_name,
> > + int fh_id, int rate)
> > +{
> > + struct fh_pll_domain *domain;
> > + struct fh_pll_regs *regs;
> > + struct fh_pll_data *data;
> > + struct hdlr_data *d = (struct hdlr_data *)priv_data;
> > + spinlock_t *lock = d->lock;
> > + struct pll_dts *array = d->array;
> > + unsigned long flags = 0;
> > +
> > + spin_lock_irqsave(lock, flags);
> > +
> > + domain = d->domain;
> > + regs = &domain->regs[fh_id];
> > + data = &domain->data[fh_id];
> > +
> > + fhctl_set_ssc_regs(regs, data, fh_id, rate);
> > +
> > + array->ssc_rate = rate;
> > +
> > + spin_unlock_irqrestore(lock, flags);
> > +
> > + return 0;
> > +}
> > +
> > +static int fhctl_ap_ssc_disable(void *priv_data, char *domain_name, int fh_id)
> > +{
> > + struct fh_pll_domain *domain;
> > + struct fh_pll_regs *regs;
> > + struct fh_pll_data *data;
> > + struct hdlr_data *d = (struct hdlr_data *)priv_data;
> > + spinlock_t *lock = d->lock;
> > + struct pll_dts *array = d->array;
> > + unsigned long flags = 0;
> > +
> > + spin_lock_irqsave(lock, flags);
> > +
> > + domain = d->domain;
> > + regs = &domain->regs[fh_id];
> > + data = &domain->data[fh_id];
> > +
> > + fhctl_set_ssc_regs(regs, data, fh_id, 0);
> > +
> > + array->ssc_rate = 0;
> > +
> > + spin_unlock_irqrestore(lock, flags);
> > +
> > + return 0;
> > +}
>
>
> Just commonize these two...
>
> static int __fhctl_ap_ssc_enable(struct hdlr_data *d, int fh_id, int rate)
> {
> struct fh_pll_domain *domain = d->domain;
>
> struct fh_pll_regs *regs = &domain->regs[fh_id];
>
> struct fh_pll_data *data = &domain->data[fh_id];
>
> struct pll_dts *array = d->array;
>
> spinlock_t *lock = d->lock;
>
> unsigned long flags = 0;
>
>
>
> spin_lock_irqsave(lock, flags);
>
>
>
> fhctl_set_ssc_regs(regs, data, fh_id, rate);
>
>
>
> array->ssc_rate = rate;
>
>
>
> spin_unlock_irqrestore(lock, flags);
>
>
>
> return 0;
> }
>
> static int fhctl_ap_ssc_enable(void *priv_data, char *domain_name, int fh_id, int rate)
> {
> return __fhctl_ap_ssc_enable((struct hdlr_data *)priv_data, domain_name,
> fh_id, rate);
> }
>
> static int fhctl_ap_ssc_disable(void *priv_data, char *domain_name, int fh_id)
> {
> return __fhctl_ap_ssc_enable((struct hdlr_data *)priv_data, domain_name,
> fh_id, 0);
> }

OK, we will commonize these. Thanks.

>
>
> > +
> > +static int fhctl_ap_hw_init(struct pll_dts *array, struct fh_ap_match *match)
> > +{
> > + static DEFINE_SPINLOCK(lock);
> > + struct hdlr_data *priv_data;
> > + struct fh_hdlr *hdlr;
> > + struct fh_pll_domain *domain;
> > + int fh_id = array->fh_id;
> > + struct fh_pll_regs *regs;
> > + struct fh_pll_data *data;
> > + int mask = BIT(fh_id);
> > +
> > + priv_data = kzalloc(sizeof(*priv_data), GFP_KERNEL);
> > + hdlr = kzalloc(sizeof(*hdlr), GFP_KERNEL);
> > + init_fh_domain(array->domain, array->comp, array->fhctl_base,
> > + array->apmixed_base);
> > +
> > + priv_data->array = array;
> > + priv_data->lock = &lock;
> > + priv_data->domain = get_fh_domain(array->domain);
> > +
> > + /* do HW init */
> > + domain = priv_data->domain;
> > + regs = &domain->regs[fh_id];
> > + data = &domain->data[fh_id];
> > +
> > + fh_set_field(regs->reg_clk_con, mask, 1);
> > + fh_set_field(regs->reg_rst_con, mask, 0);
> > + fh_set_field(regs->reg_rst_con, mask, 1);
> > + writel(0x0, regs->reg_cfg);
> > + writel(0x0, regs->reg_updnlmt);
> > + writel(0x0, regs->reg_dds);
> > +
> > + /* hook to array */
> > + hdlr->data = priv_data;
> > + hdlr->ops = match->hdlr->ops;
> > + /* hook hdlr to array is the last step */
> > + mb();
>
> I really don't think that you need this barrier here - if there's something that
> I have misunderstood about that, please provide an extensive explanation.

Actually we can remove this mb(), the original thought is that make sure once
hdlr is used, hdlr->data and hdlr->ops is prepared.
After review, hdlr won't be used during fhctl_ap_hw_init, so it can be safely
removed. Thanks.

>
> > + array->hdlr = hdlr;
> > +
> > + /* do SSC */
> > + if (array->ssc_rate) {
> > + struct fh_hdlr *hdlr = array->hdlr;
> > +
> > + hdlr->ops->ssc_enable(hdlr->data, array->domain, array->fh_id,
> > + array->ssc_rate);
> > + }
> > +
> > + return 0;
> > +}
> > +
> > +static struct fh_operation fhctl_ap_ops = {
> > + .hopping = fhctl_ap_hopping,
> > + .ssc_enable = fhctl_ap_ssc_enable,
> > + .ssc_disable = fhctl_ap_ssc_disable,
> > +};
> > +
> > +static struct fh_hdlr mt8186_hdlr = {
> > + .ops = &fhctl_ap_ops,
> > +};
> > +
> > +static struct fh_ap_match mt8186_match = {
> > + .name = "mediatek,mt8186-fhctl",
> > + .hdlr = &mt8186_hdlr,
> > + .init = &fhctl_ap_hw_init,
> > +};
> > +
> > +static struct fh_ap_match *matches[] = {
> > + &mt8186_match,
> > + NULL,
> > +};
> > +
> > +int fhctl_ap_init(struct pll_dts *array)
> > +{
> > + int i;
> > + int num_pll = array->num_pll;
> > + struct fh_ap_match **match = matches;
> > +
> > + /* find match by compatible */
> > + for (i = 0; i < ARRAY_SIZE(matches); i++) {
> > + char *comp = (*match)->name;
> > + char *target = array->comp;
> > +
> > + if (!strcmp(comp, target))
> > + break;
> > + match++;
> > + }
> > +
> > + if (*match == NULL)
> > + return -1;
> > +
> > + /* init flow for every pll */
> > + for (i = 0; i < num_pll; i++, array++) {
> > + char *method = array->method;
> > +
> > + if (!strcmp(method, FHCTL_TARGET))
> > + (*match)->init(array, *match);
> > + }
> > +
> > + return 0;
> > +}
> > diff --git a/drivers/clk/mediatek/clk-fhctl-pll.c b/drivers/clk/mediatek/clk-fhctl-pll.c
> > new file mode 100644
> > index 000000000000..b3ccbbd04e1b
> > --- /dev/null
> > +++ b/drivers/clk/mediatek/clk-fhctl-pll.c
> > @@ -0,0 +1,209 @@
> > +// SPDX-License-Identifier: GPL-2.0
> > +/*
> > + * Copyright (c) 2022 MediaTek Inc.
> > + */
> > +
> > +#include <linux/device.h>
> > +#include <linux/module.h>
> > +#include "clk-fhctl-pll.h"
> > +#include "clk-fhctl-util.h"
> > +
> > +#define REG_ADDR(base, x) ((void __iomem *)((unsigned long)base + (x)))
> > +
> > +struct fh_pll_match {
> > + char *compatible;
> > + struct fh_pll_domain **domain_list;
> > +};
> > +
> > +static int fhctl_pll_init(struct fh_pll_domain *d, void __iomem *fhctl_base,
> > + void __iomem *apmixed_base)
> > +{
> > + struct fh_pll_data *data = d->data;
> > + struct fh_pll_offset *offset = d->offset;
> > + struct fh_pll_regs *regs = d->regs;
> > +
> > + if (regs->reg_hp_en)
> > + return 0;
> > +
> > + while (data->dds_mask != 0) {
> > + int regs_offset;
> > +
> > + /* fhctl common part */
> > + regs->reg_hp_en = REG_ADDR(fhctl_base, offset->offset_hp_en);
> > + regs->reg_clk_con = REG_ADDR(fhctl_base,
> > + offset->offset_clk_con);
> > + regs->reg_rst_con = REG_ADDR(fhctl_base,
> > + offset->offset_rst_con);
> > + regs->reg_slope0 = REG_ADDR(fhctl_base, offset->offset_slope0);
> > + regs->reg_slope1 = REG_ADDR(fhctl_base, offset->offset_slope1);
> > +
> > + /* fhctl pll part */
> > + regs_offset = offset->offset_fhctl + offset->offset_cfg;
> > + regs->reg_cfg = REG_ADDR(fhctl_base, regs_offset);
> > + regs->reg_updnlmt = REG_ADDR(regs->reg_cfg,
> > + offset->offset_updnlmt);
> > + regs->reg_dds = REG_ADDR(regs->reg_cfg, offset->offset_dds);
> > + regs->reg_dvfs = REG_ADDR(regs->reg_cfg, offset->offset_dvfs);
> > + regs->reg_mon = REG_ADDR(regs->reg_cfg, offset->offset_mon);
> > +
> > + /* apmixed part */
> > + regs->reg_con_pcw = REG_ADDR(apmixed_base,
> > + offset->offset_con_pcw);
> > + regs->reg_con_postdiv = REG_ADDR(apmixed_base,
> > + offset->offset_con_postdiv);
> > +
> > + data++;
> > + offset++;
> > + regs++;
> > + }
> > +
> > + return 0;
> > +}
> > +
> > +static unsigned int __postdiv_pow_tbl[8] = {1, 2, 4, 8, 16, 1, 1, 1};
> > +#define POSTDIV_TABLE_SIZE (sizeof(__postdiv_pow_tbl)\
> > + /sizeof(unsigned int))
> > +
> > +#define SIZE_8186_TOP (sizeof(mt8186_top_data)\
> > + /sizeof(struct fh_pll_data))
> > +#define DATA_8186_TOP(_name) { \
>
> Is it just only about the name?
> I mean, are there other SoCs for which each PLL needs different parameters?
>
> If not, there are many ways to commonize these params instead of repeating
> them over and over again...

Some parameters are difference on other SoCs. We will find a way to commonize
these. Thanks.

>
> > + .name = _name, \
> > + .dds_mask = GENMASK(21, 0), \
> > + .postdiv_mask = GENMASK(26, 24), \
> > + .postdiv_offset = 24, \
> > + .postdiv_table = __postdiv_pow_tbl, \
> > + .postdiv_table_size = POSTDIV_TABLE_SIZE, \
> > + .slope0_value = 0x6003c97, \
> > + .slope1_value = 0x6003c97, \
> > + .sfstrx_en = BIT(2), \
> > + .frddsx_en = BIT(1), \
> > + .fhctlx_en = BIT(0), \
> > + .tgl_org = BIT(31), \
> > + .dvfs_tri = BIT(31), \
> > + .pcwchg = BIT(31), \
> > + .dt_val = 0x0, \
> > + .df_val = 0x9, \
> > + .updnlmt_shft = 16, \
> > + .msk_frddsx_dys = GENMASK(23, 20), \
> > + .msk_frddsx_dts = GENMASK(19, 16), \
> > + }
> > +#define OFFSET_8186_TOP(_fhctl, _con_pcw) { \
> > + .offset_fhctl = _fhctl, \
> > + .offset_con_pcw = _con_pcw, \
> > + .offset_con_postdiv = _con_pcw, \
> > + .offset_hp_en = 0x0, \
> > + .offset_clk_con = 0x8, \
> > + .offset_rst_con = 0xc, \
> > + .offset_slope0 = 0x10, \
> > + .offset_slope1 = 0x14, \
> > + .offset_cfg = 0x0, \
> > + .offset_updnlmt = 0x4, \
> > + .offset_dds = 0x8, \
> > + .offset_dvfs = 0xc, \
> > + .offset_mon = 0x10, \
> > + }
> > +static struct fh_pll_data mt8186_top_data[] = {
> > + DATA_8186_TOP("armpll_ll"),
> > + DATA_8186_TOP("armpll_bl"),
> > + DATA_8186_TOP("ccipll"),
> > + DATA_8186_TOP("mainpll"),
> > + DATA_8186_TOP("mmpll"),
> > + DATA_8186_TOP("tvdpll"),
> > + DATA_8186_TOP("mpll"),
> > + DATA_8186_TOP("adsppll"),
> > + DATA_8186_TOP("mfgpll"),
> > + DATA_8186_TOP("nnapll"),
> > + DATA_8186_TOP("nna2pll"),
> > + DATA_8186_TOP("msdcpll"),
> > + DATA_8186_TOP("mempll"),
> > + {}
> > +};
> > +static struct fh_pll_offset mt8186_top_offset[] = {
> > + OFFSET_8186_TOP(0x003C, 0x0208),
> > + OFFSET_8186_TOP(0x0050, 0x0218),
> > + OFFSET_8186_TOP(0x0064, 0x0228),
> > + OFFSET_8186_TOP(0x0078, 0x0248),
> > + OFFSET_8186_TOP(0x008C, 0x0258),
> > + OFFSET_8186_TOP(0x00A0, 0x0268),
> > + OFFSET_8186_TOP(0x00B4, 0x0278),
> > + OFFSET_8186_TOP(0x00C8, 0x0308),
> > + OFFSET_8186_TOP(0x00DC, 0x0318),
> > + OFFSET_8186_TOP(0x00F0, 0x0360),
> > + OFFSET_8186_TOP(0x0104, 0x0370),
> > + OFFSET_8186_TOP(0x0118, 0x0390),
> > + OFFSET_8186_TOP(0x012c, 0xdeb1),
> > + {}
> > +};
> > +static struct fh_pll_regs mt8186_top_regs[SIZE_8186_TOP];
> > +static struct fh_pll_domain mt8186_top = {
> > + .name = "top",
> > + .data = (struct fh_pll_data *)&mt8186_top_data,
> > + .offset = (struct fh_pll_offset *)&mt8186_top_offset,
> > + .regs = (struct fh_pll_regs *)&mt8186_top_regs,
> > + .init = &fhctl_pll_init,
> > +};
> > +static struct fh_pll_domain *mt8186_domain[] = {
> > + &mt8186_top,
> > + NULL,
> > +};
> > +static struct fh_pll_match mt8186_match = {
> > + .compatible = "mediatek,mt8186-fhctl",
> > + .domain_list = (struct fh_pll_domain **)mt8186_domain,
> > +};
> > +
> > +static const struct fh_pll_match *matches[] = {
> > + &mt8186_match,
> > + NULL
> > +};
> > +
> > +
> > +static struct fh_pll_domain **get_list(char *comp)
> > +{
> > + struct fh_pll_match **match;
> > + static struct fh_pll_domain **list;
> > + int i;
> > +
> > + match = (struct fh_pll_match **)matches;
> > +
> > + /* name used only if !list */
> > + if (!list) {
> > + for (i = 0; i < ARRAY_SIZE(matches); i++) {
> > + if (!strcmp(comp, (*match)->compatible)) {
> > + list = (*match)->domain_list;
> > + break;
> > + }
> > + match++;
> > + }
> > + }
> > + return list;
> > +}
> > +void init_fh_domain(const char *domain, char *comp, void __iomem *fhctl_base,
> > + void __iomem *apmixed_base)
> > +{
> > + struct fh_pll_domain **list;
> > +
> > + list = get_list(comp);
> > +
> > + while (*list != NULL) {
> > + if (!strcmp(domain, (*list)->name)) {
> > + (*list)->init(*list, fhctl_base, apmixed_base);
> > + return;
> > + }
> > + list++;
> > + }
> > +}
> > +
> > +struct fh_pll_domain *get_fh_domain(const char *domain)
> > +{
> > + struct fh_pll_domain **list;
> > +
> > + list = get_list(NULL);
> > +
> > + /* find instance */
> > + while (*list != NULL) {
> > + if (!strcmp(domain, (*list)->name))
> > + return *list;
> > + list++;
> > + }
> > + return NULL;
> > +}
> > diff --git a/drivers/clk/mediatek/clk-fhctl-pll.h b/drivers/clk/mediatek/clk-fhctl-pll.h
> > new file mode 100644
> > index 000000000000..7f0f7577f7a5
> > --- /dev/null
> > +++ b/drivers/clk/mediatek/clk-fhctl-pll.h
> > @@ -0,0 +1,74 @@
> > +/* SPDX-License-Identifier: GPL-2.0 */
> > +/*
> > + * Copyright (c) 2022 MediaTek Inc.
> > + */
> > +
> > +#ifndef __CLK_FHCTL_PLL_H
> > +#define __CLK_FHCTL_PLL_H
> > +#include <linux/types.h>
> > +#include <linux/bitops.h>
> > +#include <linux/iopoll.h>
> > +
> > +struct fh_pll_data {
> > + char *name;
> > + unsigned int dds_mask;
> > + unsigned int postdiv_mask;
> > + unsigned int postdiv_offset;
> > + unsigned int *postdiv_table;
> > + unsigned int postdiv_table_size;
> > + unsigned int slope0_value;
> > + unsigned int slope1_value;
> > + unsigned int sfstrx_en;
> > + unsigned int frddsx_en;
> > + unsigned int fhctlx_en;
> > + unsigned int tgl_org;
> > + unsigned int dvfs_tri;
> > + unsigned int pcwchg;
> > + unsigned int dt_val;
> > + unsigned int df_val;
> > + unsigned int updnlmt_shft;
> > + unsigned int msk_frddsx_dys;
> > + unsigned int msk_frddsx_dts;
>
> That's describing some hardware, so... you should really use `u32` here
> as that would be more descriptive.

OK, we will fix it. Thanks.

>
> > +};
> > +struct fh_pll_offset {
> > + int offset_fhctl;
> > + int offset_con_pcw;
> > + int offset_con_postdiv;
> > + int offset_hp_en;
> > + int offset_clk_con;
> > + int offset_rst_con;
> > + int offset_slope0;
> > + int offset_slope1;
> > + int offset_cfg;
> > + int offset_updnlmt;
> > + int offset_dds;
> > + int offset_dvfs;
> > + int offset_mon;
>
> These also seem to be describing HW registers, and I don't think that
> we'll ever see a negative offset for any of these?

Oh, you are right, these are positive value. We will fix it. Thanks.

>
> > +};
> > +struct fh_pll_regs {
> > + void __iomem *reg_hp_en;
> > + void __iomem *reg_clk_con;
> > + void __iomem *reg_rst_con;
> > + void __iomem *reg_slope0;
> > + void __iomem *reg_slope1;
> > + void __iomem *reg_cfg;
> > + void __iomem *reg_updnlmt;
> > + void __iomem *reg_dds;
> > + void __iomem *reg_dvfs;
> > + void __iomem *reg_mon;
> > + void __iomem *reg_con_pcw;
> > + void __iomem *reg_con_postdiv;
> > +};
> > +struct fh_pll_domain {
> > + char *name;
> > + struct fh_pll_data *data;
> > + struct fh_pll_offset *offset;
> > + struct fh_pll_regs *regs;
> > + int (*init)(struct fh_pll_domain *d, void __iomem *fhctl_base,
> > + void __iomem *apmixed_base);
> > +};
> > +extern struct fh_pll_domain *get_fh_domain(const char *name);
> > +extern void init_fh_domain(const char *domain_name, char *comp_name,
> > + void __iomem *fhctl_base,
> > + void __iomem *apmixed_base);
> > +#endif
>
> ...and I think this covers enough of the code that may be transferred to clk-pll.
>
> Excited to see the next iteration of this one!
>
> Cheers,
> Angelo

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