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Message-ID: <7cf4ff77-2f33-4ee5-0e09-5aa6aef3e8be@gmail.com>
Date: Sat, 7 Dec 2019 17:28:17 +0300
From: Dmitry Osipenko <digetx@...il.com>
To: Sowjanya Komatineni <skomatineni@...dia.com>,
thierry.reding@...il.com, jonathanh@...dia.com,
mperttunen@...dia.com, gregkh@...uxfoundation.org,
sboyd@...nel.org, tglx@...utronix.de, robh+dt@...nel.org,
mark.rutland@....com
Cc: allison@...utok.net, pdeschrijver@...dia.com, pgaikwad@...dia.com,
mturquette@...libre.com, horms+renesas@...ge.net.au,
Jisheng.Zhang@...aptics.com, krzk@...nel.org, arnd@...db.de,
spujar@...dia.com, josephl@...dia.com, vidyas@...dia.com,
daniel.lezcano@...aro.org, mmaddireddy@...dia.com,
markz@...dia.com, devicetree@...r.kernel.org,
linux-clk@...r.kernel.org, linux-tegra@...r.kernel.org,
linux-kernel@...r.kernel.org, lgirdwood@...il.com,
broonie@...nel.org, perex@...ex.cz, tiwai@...e.com,
alexios.zavras@...el.com, alsa-devel@...a-project.org
Subject: Re: [PATCH v3 03/15] soc: tegra: Add Tegra PMC clock registrations
into PMC driver
06.12.2019 05:48, Sowjanya Komatineni пишет:
> Tegra210 and prior Tegra PMC has clk_out_1, clk_out_2, clk_out_3 with
> mux and gate for each of these clocks.
>
> Currently these PMC clocks are registered by Tegra clock driver using
> clk_register_mux and clk_register_gate by passing PMC base address
> and register offsets and PMC programming for these clocks happens
> through direct PMC access by the clock driver.
>
> With this, when PMC is in secure mode any direct PMC access from the
> non-secure world does not go through and these clocks will not be
> functional.
>
> This patch adds these clocks registration with PMC as a clock provider
> for these clocks. clk_ops callback implementations for these clocks
> uses tegra_pmc_readl and tegra_pmc_writel which supports PMC programming
> in secure mode and non-secure mode.
>
> Signed-off-by: Sowjanya Komatineni <skomatineni@...dia.com>
> ---
> drivers/soc/tegra/pmc.c | 305 ++++++++++++++++++++++++++++++++++++++++++++++++
> 1 file changed, 305 insertions(+)
>
> diff --git a/drivers/soc/tegra/pmc.c b/drivers/soc/tegra/pmc.c
> index ea0e11a09c12..b8f6eb0ed8aa 100644
> --- a/drivers/soc/tegra/pmc.c
> +++ b/drivers/soc/tegra/pmc.c
> @@ -13,6 +13,9 @@
>
> #include <linux/arm-smccc.h>
> #include <linux/clk.h>
> +#include <linux/clk-provider.h>
> +#include <linux/clkdev.h>
> +#include <linux/clk/clk-conf.h>
> #include <linux/clk/tegra.h>
> #include <linux/debugfs.h>
> #include <linux/delay.h>
> @@ -48,6 +51,7 @@
> #include <dt-bindings/pinctrl/pinctrl-tegra-io-pad.h>
> #include <dt-bindings/gpio/tegra186-gpio.h>
> #include <dt-bindings/gpio/tegra194-gpio.h>
> +#include <dt-bindings/soc/tegra-pmc.h>
>
> #define PMC_CNTRL 0x0
> #define PMC_CNTRL_INTR_POLARITY BIT(17) /* inverts INTR polarity */
> @@ -100,6 +104,7 @@
> #define PMC_WAKE2_STATUS 0x168
> #define PMC_SW_WAKE2_STATUS 0x16c
>
> +#define PMC_CLK_OUT_CNTRL 0x1a8
> #define PMC_SENSOR_CTRL 0x1b0
> #define PMC_SENSOR_CTRL_SCRATCH_WRITE BIT(2)
> #define PMC_SENSOR_CTRL_ENABLE_RST BIT(1)
> @@ -155,6 +160,83 @@
> #define TEGRA_SMC_PMC_READ 0xaa
> #define TEGRA_SMC_PMC_WRITE 0xbb
>
> +struct pmc_clk_mux {
> + struct clk_hw hw;
> + unsigned long offs;
> + u32 mask;
> + u32 shift;
> +};
> +
> +#define to_pmc_clk_mux(_hw) container_of(_hw, struct pmc_clk_mux, hw)
> +
> +struct pmc_clk_gate {
> + struct clk_hw hw;
> + unsigned long offs;
> + u32 shift;
> +};
> +
> +#define to_pmc_clk_gate(_hw) container_of(_hw, struct pmc_clk_gate, hw)
> +
> +struct pmc_clk_init_data {
> + char *mux_name;
> + char *gate_name;
> + const char **parents;
> + int num_parents;
> + int mux_id;
> + int gate_id;
> + char *dev_name;
> + u8 mux_shift;
> + u8 gate_shift;
> +};
> +
> +static const char *clk_out1_parents[] = { "clk_m", "clk_m_div2",
> + "clk_m_div4", "extern1",
> +};
> +
> +static const char *clk_out2_parents[] = { "clk_m", "clk_m_div2",
> + "clk_m_div4", "extern2",
> +};
> +
> +static const char *clk_out3_parents[] = { "clk_m", "clk_m_div2",
> + "clk_m_div4", "extern3",
> +};
> +
> +static const struct pmc_clk_init_data tegra_pmc_clks_data[] = {
> + {
> + .mux_name = "clk_out_1_mux",
> + .gate_name = "clk_out_1",
> + .parents = clk_out1_parents,
> + .num_parents = ARRAY_SIZE(clk_out1_parents),
> + .mux_id = TEGRA_PMC_CLK_OUT_1_MUX,
> + .gate_id = TEGRA_PMC_CLK_OUT_1,
> + .dev_name = "extern1",
> + .mux_shift = 6,
> + .gate_shift = 2,
> + },
> + {
> + .mux_name = "clk_out_2_mux",
> + .gate_name = "clk_out_2",
> + .parents = clk_out2_parents,
> + .num_parents = ARRAY_SIZE(clk_out2_parents),
> + .mux_id = TEGRA_PMC_CLK_OUT_2_MUX,
> + .gate_id = TEGRA_PMC_CLK_OUT_2,
> + .dev_name = "extern2",
> + .mux_shift = 14,
> + .gate_shift = 10,
> + },
> + {
> + .mux_name = "clk_out_3_mux",
> + .gate_name = "clk_out_3",
> + .parents = clk_out3_parents,
> + .num_parents = ARRAY_SIZE(clk_out3_parents),
> + .mux_id = TEGRA_PMC_CLK_OUT_3_MUX,
> + .gate_id = TEGRA_PMC_CLK_OUT_3,
> + .dev_name = "extern3",
> + .mux_shift = 22,
> + .gate_shift = 18,
> + },
> +};
> +
> struct tegra_powergate {
> struct generic_pm_domain genpd;
> struct tegra_pmc *pmc;
> @@ -254,6 +336,9 @@ struct tegra_pmc_soc {
> */
> const struct tegra_wake_event *wake_events;
> unsigned int num_wake_events;
> +
> + const struct pmc_clk_init_data *pmc_clks_data;
> + unsigned int num_pmc_clks;
> };
>
> static const char * const tegra186_reset_sources[] = {
> @@ -2163,6 +2248,211 @@ static int tegra_pmc_clk_notify_cb(struct notifier_block *nb,
> return NOTIFY_OK;
> }
>
> +static void pmc_clk_fence_udelay(u32 offset)
> +{
> + tegra_pmc_readl(pmc, offset);
> + /* pmc clk propagation delay 2 us */
> + udelay(2);
> +}
> +
> +static u8 pmc_clk_mux_get_parent(struct clk_hw *hw)
> +{
> + struct pmc_clk_mux *mux = to_pmc_clk_mux(hw);
> + int num_parents = clk_hw_get_num_parents(hw);
> + u32 val;
> +
> + val = tegra_pmc_readl(pmc, mux->offs) >> mux->shift;
> + val &= mux->mask;
> +
> + if (val >= num_parents)
> + return -EINVAL;
How this could ever happen?
Why are you returning negative value for u8? It doesn't different from
returning val >= num_parents.
> + return val;
> +}
> +
> +static int pmc_clk_mux_set_parent(struct clk_hw *hw, u8 index)
> +{
> + struct pmc_clk_mux *mux = to_pmc_clk_mux(hw);
> + u32 val;
> +
> + val = tegra_pmc_readl(pmc, mux->offs);
> + val &= ~(mux->mask << mux->shift);
> + val |= index << mux->shift;
> + tegra_pmc_writel(pmc, val, mux->offs);
> + pmc_clk_fence_udelay(mux->offs);
> +
> + return 0;
> +}
> +
> +static const struct clk_ops pmc_clk_mux_ops = {
> + .get_parent = pmc_clk_mux_get_parent,
> + .set_parent = pmc_clk_mux_set_parent,
> + .determine_rate = __clk_mux_determine_rate,
> +};
> +
> +static struct clk *
> +tegra_pmc_clk_mux_register(const char *name, const char * const *parent_names,
> + int num_parents, unsigned long flags,
> + unsigned long offset, u32 shift, u32 mask)
> +{
> + struct clk_init_data init;
> + struct pmc_clk_mux *mux;
> +
> + mux = kzalloc(sizeof(*mux), GFP_KERNEL);
> + if (!mux)
> + return ERR_PTR(-ENOMEM);
> +
> + init.name = name;
> + init.ops = &pmc_clk_mux_ops;
> + init.parent_names = parent_names;
> + init.num_parents = num_parents;
> + init.flags = flags;
> +
> + mux->hw.init = &init;
> + mux->offs = offset;
> + mux->mask = mask;
> + mux->shift = shift;
> +
> + return clk_register(NULL, &mux->hw);
> +}
> +
> +static int pmc_clk_is_enabled(struct clk_hw *hw)
> +{
> + struct pmc_clk_gate *gate = to_pmc_clk_gate(hw);
> +
> + return tegra_pmc_readl(pmc, gate->offs) & BIT(gate->shift) ? 1 : 0;
> +}
> +
> +static void pmc_clk_set_state(struct clk_hw *hw, int state)
> +{
> + struct pmc_clk_gate *gate = to_pmc_clk_gate(hw);
> + u32 val;
> +
> + val = tegra_pmc_readl(pmc, gate->offs);
> + val = state ? (val | BIT(gate->shift)) : (val & ~BIT(gate->shift));
> + tegra_pmc_writel(pmc, val, gate->offs);
> + pmc_clk_fence_udelay(gate->offs);
> +}
> +
> +static int pmc_clk_enable(struct clk_hw *hw)
> +{
> + pmc_clk_set_state(hw, 1);
> +
> + return 0;
> +}
> +
> +static void pmc_clk_disable(struct clk_hw *hw)
> +{
> + pmc_clk_set_state(hw, 0);
> +}
> +
> +static const struct clk_ops pmc_clk_gate_ops = {
> + .is_enabled = pmc_clk_is_enabled,
> + .enable = pmc_clk_enable,
> + .disable = pmc_clk_disable,
> +};
What's the benefit of separating GATE from the MUX?
I think it could be a single clock.
> +static struct clk *
> +tegra_pmc_clk_gate_register(const char *name, const char *parent_name,
> + unsigned long flags, unsigned long offset,
> + u32 shift)
> +{
> + struct clk_init_data init;
> + struct pmc_clk_gate *gate;
> +
> + gate = kzalloc(sizeof(*gate), GFP_KERNEL);
> + if (!gate)
> + return ERR_PTR(-ENOMEM);
> +
> + init.name = name;
> + init.ops = &pmc_clk_gate_ops;
> + init.parent_names = &parent_name;
> + init.num_parents = 1;
> + init.flags = flags;
> +
> + gate->hw.init = &init;
> + gate->offs = offset;
> + gate->shift = shift;
> +
> + return clk_register(NULL, &gate->hw);
> +}
> +
> +static void tegra_pmc_clock_register(struct tegra_pmc *pmc,
> + struct device_node *np)
> +{
> + struct clk *clkmux, *clk;
> + struct clk_onecell_data *clk_data;
> + unsigned int num_clks;
> + int i, ret;
> +
> + /* each pmc clock output has a mux and a gate */
> + num_clks = pmc->soc->num_pmc_clks * 2;
> +
> + if (!num_clks)
> + return;
> +
> + clk_data = kmalloc(sizeof(*clk_data), GFP_KERNEL);
> + if (!clk_data)
> + return;
> +
> + clk_data->clks = kcalloc(TEGRA_PMC_CLK_MAX, sizeof(*clk_data->clks),
> + GFP_KERNEL);
> + if (!clk_data->clks)
> + goto free_clkdata;
> +
> + clk_data->clk_num = TEGRA_PMC_CLK_MAX;
> +
> + for (i = 0; i < TEGRA_PMC_CLK_MAX; i++)
> + clk_data->clks[i] = ERR_PTR(-ENOENT);
> +
> + for (i = 0; i < pmc->soc->num_pmc_clks; i++) {
> + const struct pmc_clk_init_data *data;
> +
> + data = pmc->soc->pmc_clks_data + i;
> +
> + clkmux = tegra_pmc_clk_mux_register(data->mux_name,
> + data->parents,
> + data->num_parents,
> + CLK_SET_RATE_NO_REPARENT |
> + CLK_SET_RATE_PARENT,
> + PMC_CLK_OUT_CNTRL,
> + data->mux_shift, 3);
> + if (IS_ERR(clkmux))
> + goto free_clks;
> +
> + clk_data->clks[data->mux_id] = clkmux;
> +
> + clk = tegra_pmc_clk_gate_register(data->gate_name,
> + data->mux_name,
> + CLK_SET_RATE_PARENT,
> + PMC_CLK_OUT_CNTRL,
> + data->gate_shift);
> + if (IS_ERR(clk))
> + goto free_clks;
> +
> + clk_data->clks[data->gate_id] = clk;
> +
> + ret = clk_set_parent(clk, clkmux);
> + if (ret < 0) {
> + pr_err("failed to set parent of %s to %s: %d\n",
> + __clk_get_name(clk),
> + __clk_get_name(clkmux), ret);
> + }
is this really needed? GATE clock has a single parent, the MUX.
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