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Wed, 4 Nov 2020 02:40:32 -0700 Received: from m18063-ThinkPad-T460p.microchip.com (10.10.115.15) by chn-vm-ex02.mchp-main.com (10.10.85.144) with Microsoft SMTP Server id 15.1.1979.3 via Frontend Transport; Wed, 4 Nov 2020 02:40:28 -0700 From: Claudiu Beznea To: , , , , , Subject: [PATCH 4/8] clk: at91: clk-sam9x60-pll: allow runtime changes for pll Date: Wed, 4 Nov 2020 11:39:58 +0200 Message-ID: <1604482802-1647-5-git-send-email-claudiu.beznea@microchip.com> X-Mailer: git-send-email 2.7.4 In-Reply-To: <1604482802-1647-1-git-send-email-claudiu.beznea@microchip.com> References: <1604482802-1647-1-git-send-email-claudiu.beznea@microchip.com> MIME-Version: 1.0 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20201104_044036_552662_E41BADF9 X-CRM114-Status: GOOD ( 19.37 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: devicetree@vger.kernel.org, Claudiu Beznea , linux-clk@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org Allow runtime frequency changes for PLLs registered with proper flags. This is necessary for CPU PLL on SAMA7G5 which is used by DVFS. Signed-off-by: Claudiu Beznea --- drivers/clk/at91/clk-sam9x60-pll.c | 102 ++++++++++++++++++++++++++++++------- drivers/clk/at91/pmc.h | 4 +- drivers/clk/at91/sam9x60.c | 13 +++-- drivers/clk/at91/sama7g5.c | 48 ++++++++++------- 4 files changed, 127 insertions(+), 40 deletions(-) diff --git a/drivers/clk/at91/clk-sam9x60-pll.c b/drivers/clk/at91/clk-sam9x60-pll.c index 78f458a7b2ef..6fe5d8530a0c 100644 --- a/drivers/clk/at91/clk-sam9x60-pll.c +++ b/drivers/clk/at91/clk-sam9x60-pll.c @@ -225,8 +225,51 @@ static int sam9x60_frac_pll_set_rate(struct clk_hw *hw, unsigned long rate, unsigned long parent_rate) { struct sam9x60_pll_core *core = to_sam9x60_pll_core(hw); + struct sam9x60_frac *frac = to_sam9x60_frac(core); + struct regmap *regmap = core->regmap; + unsigned long irqflags, clkflags = clk_hw_get_flags(hw); + unsigned int val, cfrac, cmul; + long ret; + + ret = sam9x60_frac_pll_compute_mul_frac(core, rate, parent_rate, true); + if (ret <= 0 || (clkflags & CLK_SET_RATE_GATE)) + return ret; + + spin_lock_irqsave(core->lock, irqflags); + + regmap_update_bits(regmap, AT91_PMC_PLL_UPDT, AT91_PMC_PLL_UPDT_ID_MSK, + core->id); + regmap_read(regmap, AT91_PMC_PLL_CTRL1, &val); + cmul = (val & core->layout->mul_mask) >> core->layout->mul_shift; + cfrac = (val & core->layout->frac_mask) >> core->layout->frac_shift; + + if (cmul == frac->mul && cfrac == frac->frac) + goto unlock; + + regmap_write(regmap, AT91_PMC_PLL_CTRL1, + (frac->mul << core->layout->mul_shift) | + (frac->frac << core->layout->frac_shift)); + + regmap_update_bits(regmap, AT91_PMC_PLL_UPDT, + AT91_PMC_PLL_UPDT_UPDATE | AT91_PMC_PLL_UPDT_ID_MSK, + AT91_PMC_PLL_UPDT_UPDATE | core->id); + + regmap_update_bits(regmap, AT91_PMC_PLL_CTRL0, + AT91_PMC_PLL_CTRL0_ENLOCK | AT91_PMC_PLL_CTRL0_ENPLL, + AT91_PMC_PLL_CTRL0_ENLOCK | + AT91_PMC_PLL_CTRL0_ENPLL); + + regmap_update_bits(regmap, AT91_PMC_PLL_UPDT, + AT91_PMC_PLL_UPDT_UPDATE | AT91_PMC_PLL_UPDT_ID_MSK, + AT91_PMC_PLL_UPDT_UPDATE | core->id); - return sam9x60_frac_pll_compute_mul_frac(core, rate, parent_rate, true); + while (!sam9x60_pll_ready(regmap, core->id)) + cpu_relax(); + +unlock: + spin_unlock_irqrestore(core->lock, irqflags); + + return ret; } static const struct clk_ops sam9x60_frac_pll_ops = { @@ -378,9 +421,39 @@ static int sam9x60_div_pll_set_rate(struct clk_hw *hw, unsigned long rate, { struct sam9x60_pll_core *core = to_sam9x60_pll_core(hw); struct sam9x60_div *div = to_sam9x60_div(core); + struct regmap *regmap = core->regmap; + unsigned long irqflags, clkflags = clk_hw_get_flags(hw); + unsigned int val, cdiv; div->div = DIV_ROUND_CLOSEST(parent_rate, rate) - 1; + if (clkflags & CLK_SET_RATE_GATE) + return 0; + + spin_lock_irqsave(core->lock, irqflags); + regmap_update_bits(regmap, AT91_PMC_PLL_UPDT, AT91_PMC_PLL_UPDT_ID_MSK, + core->id); + regmap_read(regmap, AT91_PMC_PLL_CTRL0, &val); + cdiv = (val & core->layout->div_mask) >> core->layout->div_shift; + + /* Stop if nothing changed. */ + if (cdiv == div->div) + goto unlock; + + regmap_update_bits(regmap, AT91_PMC_PLL_CTRL0, + core->layout->div_mask, + (div->div << core->layout->div_shift)); + + regmap_update_bits(regmap, AT91_PMC_PLL_UPDT, + AT91_PMC_PLL_UPDT_UPDATE | AT91_PMC_PLL_UPDT_ID_MSK, + AT91_PMC_PLL_UPDT_UPDATE | core->id); + + while (!sam9x60_pll_ready(regmap, core->id)) + cpu_relax(); + +unlock: + spin_unlock_irqrestore(core->lock, irqflags); + return 0; } @@ -398,12 +471,12 @@ sam9x60_clk_register_frac_pll(struct regmap *regmap, spinlock_t *lock, const char *name, const char *parent_name, struct clk_hw *parent_hw, u8 id, const struct clk_pll_characteristics *characteristics, - const struct clk_pll_layout *layout, bool critical) + const struct clk_pll_layout *layout, u32 flags) { struct sam9x60_frac *frac; struct clk_hw *hw; struct clk_init_data init; - unsigned long parent_rate, flags; + unsigned long parent_rate, irqflags; unsigned int val; int ret; @@ -418,9 +491,7 @@ sam9x60_clk_register_frac_pll(struct regmap *regmap, spinlock_t *lock, init.parent_names = &parent_name; init.num_parents = 1; init.ops = &sam9x60_frac_pll_ops; - init.flags = CLK_SET_RATE_GATE; - if (critical) - init.flags |= CLK_IS_CRITICAL; + init.flags = flags; frac->core.id = id; frac->core.hw.init = &init; @@ -429,7 +500,7 @@ sam9x60_clk_register_frac_pll(struct regmap *regmap, spinlock_t *lock, frac->core.regmap = regmap; frac->core.lock = lock; - spin_lock_irqsave(frac->core.lock, flags); + spin_lock_irqsave(frac->core.lock, irqflags); if (sam9x60_pll_ready(regmap, id)) { regmap_update_bits(regmap, AT91_PMC_PLL_UPDT, AT91_PMC_PLL_UPDT_ID_MSK, id); @@ -457,7 +528,7 @@ sam9x60_clk_register_frac_pll(struct regmap *regmap, spinlock_t *lock, goto free; } } - spin_unlock_irqrestore(frac->core.lock, flags); + spin_unlock_irqrestore(frac->core.lock, irqflags); hw = &frac->core.hw; ret = clk_hw_register(NULL, hw); @@ -469,7 +540,7 @@ sam9x60_clk_register_frac_pll(struct regmap *regmap, spinlock_t *lock, return hw; free: - spin_unlock_irqrestore(frac->core.lock, flags); + spin_unlock_irqrestore(frac->core.lock, irqflags); kfree(frac); return hw; } @@ -478,12 +549,12 @@ struct clk_hw * __init sam9x60_clk_register_div_pll(struct regmap *regmap, spinlock_t *lock, const char *name, const char *parent_name, u8 id, const struct clk_pll_characteristics *characteristics, - const struct clk_pll_layout *layout, bool critical) + const struct clk_pll_layout *layout, u32 flags) { struct sam9x60_div *div; struct clk_hw *hw; struct clk_init_data init; - unsigned long flags; + unsigned long irqflags; unsigned int val; int ret; @@ -498,10 +569,7 @@ sam9x60_clk_register_div_pll(struct regmap *regmap, spinlock_t *lock, init.parent_names = &parent_name; init.num_parents = 1; init.ops = &sam9x60_div_pll_ops; - init.flags = CLK_SET_RATE_GATE | CLK_SET_PARENT_GATE | - CLK_SET_RATE_PARENT; - if (critical) - init.flags |= CLK_IS_CRITICAL; + init.flags = flags; div->core.id = id; div->core.hw.init = &init; @@ -510,14 +578,14 @@ sam9x60_clk_register_div_pll(struct regmap *regmap, spinlock_t *lock, div->core.regmap = regmap; div->core.lock = lock; - spin_lock_irqsave(div->core.lock, flags); + spin_lock_irqsave(div->core.lock, irqflags); regmap_update_bits(regmap, AT91_PMC_PLL_UPDT, AT91_PMC_PLL_UPDT_ID_MSK, id); regmap_read(regmap, AT91_PMC_PLL_CTRL0, &val); div->div = FIELD_GET(PMC_PLL_CTRL0_DIV_MSK, val); - spin_unlock_irqrestore(div->core.lock, flags); + spin_unlock_irqrestore(div->core.lock, irqflags); hw = &div->core.hw; ret = clk_hw_register(NULL, hw); diff --git a/drivers/clk/at91/pmc.h b/drivers/clk/at91/pmc.h index 7b86affc6d7c..364c9d4d7d51 100644 --- a/drivers/clk/at91/pmc.h +++ b/drivers/clk/at91/pmc.h @@ -190,14 +190,14 @@ struct clk_hw * __init sam9x60_clk_register_div_pll(struct regmap *regmap, spinlock_t *lock, const char *name, const char *parent_name, u8 id, const struct clk_pll_characteristics *characteristics, - const struct clk_pll_layout *layout, bool critical); + const struct clk_pll_layout *layout, u32 flags); struct clk_hw * __init sam9x60_clk_register_frac_pll(struct regmap *regmap, spinlock_t *lock, const char *name, const char *parent_name, struct clk_hw *parent_hw, u8 id, const struct clk_pll_characteristics *characteristics, - const struct clk_pll_layout *layout, bool critical); + const struct clk_pll_layout *layout, u32 flags); struct clk_hw * __init at91_clk_register_programmable(struct regmap *regmap, const char *name, diff --git a/drivers/clk/at91/sam9x60.c b/drivers/clk/at91/sam9x60.c index 3c4c95603595..e5094c69e606 100644 --- a/drivers/clk/at91/sam9x60.c +++ b/drivers/clk/at91/sam9x60.c @@ -228,13 +228,15 @@ static void __init sam9x60_pmc_setup(struct device_node *np) hw = sam9x60_clk_register_frac_pll(regmap, &pmc_pll_lock, "pllack_fracck", "mainck", sam9x60_pmc->chws[PMC_MAIN], 0, &plla_characteristics, - &pll_frac_layout, true); + &pll_frac_layout, + CLK_IS_CRITICAL | CLK_SET_RATE_GATE); if (IS_ERR(hw)) goto err_free; hw = sam9x60_clk_register_div_pll(regmap, &pmc_pll_lock, "pllack_divck", "pllack_fracck", 0, &plla_characteristics, - &pll_div_layout, true); + &pll_div_layout, + CLK_IS_CRITICAL | CLK_SET_RATE_GATE); if (IS_ERR(hw)) goto err_free; @@ -243,13 +245,16 @@ static void __init sam9x60_pmc_setup(struct device_node *np) hw = sam9x60_clk_register_frac_pll(regmap, &pmc_pll_lock, "upllck_fracck", "main_osc", main_osc_hw, 1, &upll_characteristics, - &pll_frac_layout, false); + &pll_frac_layout, CLK_SET_RATE_GATE); if (IS_ERR(hw)) goto err_free; hw = sam9x60_clk_register_div_pll(regmap, &pmc_pll_lock, "upllck_divck", "upllck_fracck", 1, &upll_characteristics, - &pll_div_layout, false); + &pll_div_layout, + CLK_SET_RATE_GATE | + CLK_SET_PARENT_GATE | + CLK_SET_RATE_PARENT); if (IS_ERR(hw)) goto err_free; diff --git a/drivers/clk/at91/sama7g5.c b/drivers/clk/at91/sama7g5.c index d3c3469d47d9..fdacd4410da6 100644 --- a/drivers/clk/at91/sama7g5.c +++ b/drivers/clk/at91/sama7g5.c @@ -95,15 +95,15 @@ static const struct clk_pll_layout pll_layout_divio = { * @p: clock parent * @l: clock layout * @t: clock type - * @f: true if clock is critical and cannot be disabled + * @f: clock flags * @eid: export index in sama7g5->chws[] array */ static const struct { const char *n; const char *p; const struct clk_pll_layout *l; + u32 f; u8 t; - u8 c; u8 eid; } sama7g5_plls[][PLL_ID_MAX] = { [PLL_ID_CPU] = { @@ -111,13 +111,13 @@ static const struct { .p = "mainck", .l = &pll_layout_frac, .t = PLL_TYPE_FRAC, - .c = 1, }, + .f = CLK_IS_CRITICAL, }, { .n = "cpupll_divpmcck", .p = "cpupll_fracck", .l = &pll_layout_divpmc, .t = PLL_TYPE_DIV, - .c = 1, + .f = CLK_IS_CRITICAL | CLK_SET_RATE_PARENT, .eid = PMC_CPUPLL, }, }, @@ -126,13 +126,13 @@ static const struct { .p = "mainck", .l = &pll_layout_frac, .t = PLL_TYPE_FRAC, - .c = 1, }, + .f = CLK_IS_CRITICAL | CLK_SET_RATE_GATE, }, { .n = "syspll_divpmcck", .p = "syspll_fracck", .l = &pll_layout_divpmc, .t = PLL_TYPE_DIV, - .c = 1, + .f = CLK_IS_CRITICAL | CLK_SET_RATE_GATE, .eid = PMC_SYSPLL, }, }, @@ -141,55 +141,66 @@ static const struct { .p = "mainck", .l = &pll_layout_frac, .t = PLL_TYPE_FRAC, - .c = 1, }, + .f = CLK_IS_CRITICAL | CLK_SET_RATE_GATE, }, { .n = "ddrpll_divpmcck", .p = "ddrpll_fracck", .l = &pll_layout_divpmc, .t = PLL_TYPE_DIV, - .c = 1, }, + .f = CLK_IS_CRITICAL | CLK_SET_RATE_GATE, }, }, [PLL_ID_IMG] = { { .n = "imgpll_fracck", .p = "mainck", .l = &pll_layout_frac, - .t = PLL_TYPE_FRAC, }, + .t = PLL_TYPE_FRAC, + .f = CLK_SET_RATE_GATE, }, { .n = "imgpll_divpmcck", .p = "imgpll_fracck", .l = &pll_layout_divpmc, - .t = PLL_TYPE_DIV, }, + .t = PLL_TYPE_DIV, + .f = CLK_SET_RATE_GATE | CLK_SET_PARENT_GATE | + CLK_SET_RATE_PARENT, }, }, [PLL_ID_BAUD] = { { .n = "baudpll_fracck", .p = "mainck", .l = &pll_layout_frac, - .t = PLL_TYPE_FRAC, }, + .t = PLL_TYPE_FRAC, + .f = CLK_SET_RATE_GATE, }, { .n = "baudpll_divpmcck", .p = "baudpll_fracck", .l = &pll_layout_divpmc, - .t = PLL_TYPE_DIV, }, + .t = PLL_TYPE_DIV, + .f = CLK_SET_RATE_GATE | CLK_SET_PARENT_GATE | + CLK_SET_RATE_PARENT, }, }, [PLL_ID_AUDIO] = { { .n = "audiopll_fracck", .p = "main_xtal", .l = &pll_layout_frac, - .t = PLL_TYPE_FRAC, }, + .t = PLL_TYPE_FRAC, + .f = CLK_SET_RATE_GATE, }, { .n = "audiopll_divpmcck", .p = "audiopll_fracck", .l = &pll_layout_divpmc, .t = PLL_TYPE_DIV, + .f = CLK_SET_RATE_GATE | CLK_SET_PARENT_GATE | + CLK_SET_RATE_PARENT, .eid = PMC_AUDIOPMCPLL, }, { .n = "audiopll_diviock", .p = "audiopll_fracck", .l = &pll_layout_divio, .t = PLL_TYPE_DIV, + .f = CLK_SET_RATE_GATE | CLK_SET_PARENT_GATE | + CLK_SET_RATE_PARENT, .eid = PMC_AUDIOIOPLL, }, }, @@ -197,12 +208,15 @@ static const struct { { .n = "ethpll_fracck", .p = "main_xtal", .l = &pll_layout_frac, - .t = PLL_TYPE_FRAC, }, + .t = PLL_TYPE_FRAC, + .f = CLK_SET_RATE_GATE, }, { .n = "ethpll_divpmcck", .p = "ethpll_fracck", .l = &pll_layout_divpmc, - .t = PLL_TYPE_DIV, }, + .t = PLL_TYPE_DIV, + .f = CLK_SET_RATE_GATE | CLK_SET_PARENT_GATE | + CLK_SET_RATE_PARENT, }, }, }; @@ -890,7 +904,7 @@ static void __init sama7g5_pmc_setup(struct device_node *np) sama7g5_plls[i][j].p, parent_hw, i, &pll_characteristics, sama7g5_plls[i][j].l, - sama7g5_plls[i][j].c); + sama7g5_plls[i][j].f); break; case PLL_TYPE_DIV: @@ -899,7 +913,7 @@ static void __init sama7g5_pmc_setup(struct device_node *np) sama7g5_plls[i][j].p, i, &pll_characteristics, sama7g5_plls[i][j].l, - sama7g5_plls[i][j].c); + sama7g5_plls[i][j].f); break; default: