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Message-ID: <149013838063.54062.4258647016605052547@resonance>
Date: Tue, 21 Mar 2017 16:19:40 -0700
From: Michael Turquette <mturquette@...libre.com>
To: Jerome Brunet <jbrunet@...libre.com>,
"Stephen Boyd" <sboyd@...eaurora.org>,
"Kevin Hilman" <khilman@...libre.com>,
"Carlo Caione" <carlo@...one.org>
Cc: "Jerome Brunet" <jbrunet@...libre.com>, linux-clk@...r.kernel.org,
linux-amlogic@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 5/9] clk: meson: mpll: add rw operation
Quoting Jerome Brunet (2017-03-09 02:41:50)
> This patch adds new callbacks to the meson-mpll driver to control
> and set the pll rate. For this, we also need to add the enable bit and
> sdm enable bit. The corresponding parameters are added to mpll data
> structure.
>
> Signed-off-by: Jerome Brunet <jbrunet@...libre.com>
Patch looks good to me. I'm really happy to see the mpll's get sorted
out finally!
Regards,
Mike
> ---
> drivers/clk/meson/clk-mpll.c | 152 +++++++++++++++++++++++++++++++++++++++++--
> drivers/clk/meson/clkc.h | 4 +-
> drivers/clk/meson/gxbb.c | 30 +++++++++
> 3 files changed, 180 insertions(+), 6 deletions(-)
>
> diff --git a/drivers/clk/meson/clk-mpll.c b/drivers/clk/meson/clk-mpll.c
> index 03af79005ddb..342b85d4e22a 100644
> --- a/drivers/clk/meson/clk-mpll.c
> +++ b/drivers/clk/meson/clk-mpll.c
> @@ -64,16 +64,50 @@
> #include <linux/clk-provider.h>
> #include "clkc.h"
>
> -#define SDM_MAX 16384
> +#define SDM_DEN 16384
> +#define SDM_MIN 1
> +#define SDM_MAX 16383
> +#define N2_MIN 4
> +#define N2_MAX 127
>
> #define to_meson_clk_mpll(_hw) container_of(_hw, struct meson_clk_mpll, hw)
>
> +static unsigned long rate_from_params(unsigned long parent_rate,
> + unsigned long sdm,
> + unsigned long n2)
> +{
> + return (parent_rate * SDM_DEN) / ((SDM_DEN * n2) + sdm);
> +}
> +
> +static void params_from_rate(unsigned long requested_rate,
> + unsigned long parent_rate,
> + unsigned long *sdm,
> + unsigned long *n2)
> +{
> + uint64_t div = parent_rate;
> + unsigned long rem = do_div(div, requested_rate);
> +
> + if (div < N2_MIN) {
> + *n2 = N2_MIN;
> + *sdm = SDM_MIN;
> + } else if (div > N2_MAX) {
> + *n2 = N2_MAX;
> + *sdm = SDM_MAX;
> + } else {
> + *n2 = div;
> + *sdm = DIV_ROUND_UP(rem * SDM_DEN, requested_rate);
> + if (*sdm < SDM_MIN)
> + *sdm = SDM_MIN;
> + else if (*sdm > SDM_MAX)
> + *sdm = SDM_MAX;
> + }
> +}
> +
> static unsigned long mpll_recalc_rate(struct clk_hw *hw,
> unsigned long parent_rate)
> {
> struct meson_clk_mpll *mpll = to_meson_clk_mpll(hw);
> struct parm *p;
> - unsigned long rate = 0;
> unsigned long reg, sdm, n2;
>
> p = &mpll->sdm;
> @@ -84,11 +118,119 @@ static unsigned long mpll_recalc_rate(struct clk_hw *hw,
> reg = readl(mpll->base + p->reg_off);
> n2 = PARM_GET(p->width, p->shift, reg);
>
> - rate = (parent_rate * SDM_MAX) / ((SDM_MAX * n2) + sdm);
> + return rate_from_params(parent_rate, sdm, n2);
> +}
> +
> +static long mpll_round_rate(struct clk_hw *hw,
> + unsigned long rate,
> + unsigned long *parent_rate)
> +{
> + unsigned long sdm, n2;
> +
> + params_from_rate(rate, *parent_rate, &sdm, &n2);
> + return rate_from_params(*parent_rate, sdm, n2);
> +}
> +
> +static int mpll_set_rate(struct clk_hw *hw,
> + unsigned long rate,
> + unsigned long parent_rate)
> +{
> + struct meson_clk_mpll *mpll = to_meson_clk_mpll(hw);
> + struct parm *p;
> + unsigned long reg, sdm, n2;
> + unsigned long flags = 0;
> +
> + params_from_rate(rate, parent_rate, &sdm, &n2);
> +
> + if (mpll->lock)
> + spin_lock_irqsave(mpll->lock, flags);
> + else
> + __acquire(mpll->lock);
> +
> + p = &mpll->sdm;
> + reg = readl(mpll->base + p->reg_off);
> + reg = PARM_SET(p->width, p->shift, reg, sdm);
> + writel(reg, mpll->base + p->reg_off);
> +
> + p = &mpll->sdm_en;
> + reg = readl(mpll->base + p->reg_off);
> + reg = PARM_SET(p->width, p->shift, reg, 1);
> + writel(reg, mpll->base + p->reg_off);
> +
> + p = &mpll->n2;
> + reg = readl(mpll->base + p->reg_off);
> + reg = PARM_SET(p->width, p->shift, reg, n2);
> + writel(reg, mpll->base + p->reg_off);
> +
> + if (mpll->lock)
> + spin_unlock_irqrestore(mpll->lock, flags);
> + else
> + __release(mpll->lock);
>
> - return rate;
> + return 0;
> +}
> +
> +static void mpll_enable_core(struct clk_hw *hw, int enable)
> +{
> + struct meson_clk_mpll *mpll = to_meson_clk_mpll(hw);
> + struct parm *p;
> + unsigned long reg;
> + unsigned long flags = 0;
> +
> + if (mpll->lock)
> + spin_lock_irqsave(mpll->lock, flags);
> + else
> + __acquire(mpll->lock);
> +
> + p = &mpll->en;
> + reg = readl(mpll->base + p->reg_off);
> + reg = PARM_SET(p->width, p->shift, reg, enable ? 1 : 0);
> + writel(reg, mpll->base + p->reg_off);
> +
> + if (mpll->lock)
> + spin_unlock_irqrestore(mpll->lock, flags);
> + else
> + __release(mpll->lock);
> +}
> +
> +
> +static int mpll_enable(struct clk_hw *hw)
> +{
> + mpll_enable_core(hw, 1);
> +
> + return 0;
> +}
> +
> +static void mpll_disable(struct clk_hw *hw)
> +{
> + mpll_enable_core(hw, 0);
> +}
> +
> +static int mpll_is_enabled(struct clk_hw *hw)
> +{
> + struct meson_clk_mpll *mpll = to_meson_clk_mpll(hw);
> + struct parm *p;
> + unsigned long reg;
> + int en;
> +
> + p = &mpll->en;
> + reg = readl(mpll->base + p->reg_off);
> + en = PARM_GET(p->width, p->shift, reg);
> +
> + return en;
> }
>
> const struct clk_ops meson_clk_mpll_ro_ops = {
> - .recalc_rate = mpll_recalc_rate,
> + .recalc_rate = mpll_recalc_rate,
> + .round_rate = mpll_round_rate,
> + .is_enabled = mpll_is_enabled,
> +};
> +
> +const struct clk_ops meson_clk_mpll_ops = {
> + .recalc_rate = mpll_recalc_rate,
> + .round_rate = mpll_round_rate,
> + .set_rate = mpll_set_rate,
> + .enable = mpll_enable,
> + .disable = mpll_disable,
> + .is_enabled = mpll_is_enabled,
> };
> diff --git a/drivers/clk/meson/clkc.h b/drivers/clk/meson/clkc.h
> index c6be77dd8694..ad254675edd8 100644
> --- a/drivers/clk/meson/clkc.h
> +++ b/drivers/clk/meson/clkc.h
> @@ -92,8 +92,9 @@ struct meson_clk_mpll {
> struct clk_hw hw;
> void __iomem *base;
> struct parm sdm;
> + struct parm sdm_en;
> struct parm n2;
> - /* FIXME ssen gate control? */
> + struct parm en;
> spinlock_t *lock;
> };
>
> @@ -116,5 +117,6 @@ extern const struct clk_ops meson_clk_pll_ro_ops;
> extern const struct clk_ops meson_clk_pll_ops;
> extern const struct clk_ops meson_clk_cpu_ops;
> extern const struct clk_ops meson_clk_mpll_ro_ops;
> +extern const struct clk_ops meson_clk_mpll_ops;
>
> #endif /* __CLKC_H */
> diff --git a/drivers/clk/meson/gxbb.c b/drivers/clk/meson/gxbb.c
> index 79e9313e6703..79fb8989f8dd 100644
> --- a/drivers/clk/meson/gxbb.c
> +++ b/drivers/clk/meson/gxbb.c
> @@ -441,11 +441,21 @@ static struct meson_clk_mpll gxbb_mpll0 = {
> .shift = 0,
> .width = 14,
> },
> + .sdm_en = {
> + .reg_off = HHI_MPLL_CNTL7,
> + .shift = 15,
> + .width = 1,
> + },
> .n2 = {
> .reg_off = HHI_MPLL_CNTL7,
> .shift = 16,
> .width = 9,
> },
> + .en = {
> + .reg_off = HHI_MPLL_CNTL7,
> + .shift = 14,
> + .width = 1,
> + },
> .lock = &clk_lock,
> .hw.init = &(struct clk_init_data){
> .name = "mpll0",
> @@ -461,11 +471,21 @@ static struct meson_clk_mpll gxbb_mpll1 = {
> .shift = 0,
> .width = 14,
> },
> + .sdm_en = {
> + .reg_off = HHI_MPLL_CNTL8,
> + .shift = 15,
> + .width = 1,
> + },
> .n2 = {
> .reg_off = HHI_MPLL_CNTL8,
> .shift = 16,
> .width = 9,
> },
> + .en = {
> + .reg_off = HHI_MPLL_CNTL8,
> + .shift = 14,
> + .width = 1,
> + },
> .lock = &clk_lock,
> .hw.init = &(struct clk_init_data){
> .name = "mpll1",
> @@ -481,11 +501,21 @@ static struct meson_clk_mpll gxbb_mpll2 = {
> .shift = 0,
> .width = 14,
> },
> + .sdm_en = {
> + .reg_off = HHI_MPLL_CNTL9,
> + .shift = 15,
> + .width = 1,
> + },
> .n2 = {
> .reg_off = HHI_MPLL_CNTL9,
> .shift = 16,
> .width = 9,
> },
> + .en = {
> + .reg_off = HHI_MPLL_CNTL9,
> + .shift = 14,
> + .width = 1,
> + },
> .lock = &clk_lock,
> .hw.init = &(struct clk_init_data){
> .name = "mpll2",
> --
> 2.9.3
>
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