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 X-Spam-Level: X-Spam-Status: No, score=-12.8 required=3.0 tests=BAYES_00,DKIM_INVALID, DKIM_SIGNED,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH,MAILING_LIST_MULTI, SIGNED_OFF_BY,SPF_HELO_NONE,SPF_PASS,USER_AGENT_GIT autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id BD42CC433E7 for ; Wed, 15 Jul 2020 11:25:47 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 8DAF72071B for ; Wed, 15 Jul 2020 11:25:47 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=fail reason="signature verification failed" (2048-bit key) header.d=microchip.com header.i=@microchip.com header.b="2NZ+I77P" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1730363AbgGOLZq (ORCPT ); Wed, 15 Jul 2020 07:25:46 -0400 Received: from esa6.microchip.iphmx.com ([216.71.154.253]:21114 "EHLO esa6.microchip.iphmx.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1730259AbgGOLZp (ORCPT ); Wed, 15 Jul 2020 07:25:45 -0400 DKIM-Signature: v=1; a=rsa-sha256; c=simple/simple; d=microchip.com; i=@microchip.com; q=dns/txt; s=mchp; t=1594812344; x=1626348344; h=from:to:cc:subject:date:message-id:in-reply-to: references:mime-version; bh=ZZ9p3fP7qF6ymusANqDavqiSgkieV90U2FDlnOkBfeQ=; b=2NZ+I77PfLW+U2uhH3wJyq4kGtZRfBvJhcrPlrnbZj1qBEnjcwDY7Li6 hTwDAW7ZyX+8v7NMiYMk8033gxYY6oSIkHaWe9QD2/S98W+5XesiMJa+p eHoXR6xNR95RRYqMV5tvQvIWAWAz41XQOACOsY5M5X1B/1N/VvPOJ4JMc ZOhWYfaLgE14WA+sw83qVWMOdKWMagu+7ulczatpTtuY8mLJBm3L3uKDS k7OKTM105eNowtgMs/A2tSOQyt4HwPLAv0fhYBYg2YJemhE9Iz6Qznqhi Xb6SEvUVlEsampFcn8wfgjF6FAQFwLOjZEb8e/Q4+lBMoMzzD8qSPO+S6 g==; IronPort-SDR: Xfeilu2JLrwLCMBkDeq9XfdstmyvDLW1gPPCuXa+kFqKdgIXmEutHkfs4nO9LCffDSOk2Muv3g VkZ5wqD4KpGAPeTkxo0s/+fJJId0iVYLnR9MAs0Xieotpikbuau8G6/PhyVzsXWtKJwS0Ghc+F /rpvaci4Ie8nqpwO6nJG8bNopiZ3bVN83f6mndDi05jJl0VsxYIAxheNLKGFL4ZoocphN71c4r VvU7e2zblojjKrWeI59fr9FodrRtafHwkZ7otAkCI7USOijnjq3d1muNDuPX2Fhxakmv/m2ZBv qJ4= X-IronPort-AV: E=Sophos;i="5.75,355,1589266800"; d="scan'208";a="19269548" Received: from smtpout.microchip.com (HELO email.microchip.com) ([198.175.253.82]) by esa6.microchip.iphmx.com with ESMTP/TLS/AES256-SHA256; 15 Jul 2020 04:25:43 -0700 Received: from chn-vm-ex01.mchp-main.com (10.10.85.143) by chn-vm-ex03.mchp-main.com (10.10.85.151) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256) id 15.1.1979.3; Wed, 15 Jul 2020 04:25:43 -0700 Received: from m18063-ThinkPad-T460p.microchip.com (10.10.115.15) by chn-vm-ex01.mchp-main.com (10.10.85.143) with Microsoft SMTP Server id 15.1.1979.3 via Frontend Transport; Wed, 15 Jul 2020 04:25:07 -0700 From: Claudiu Beznea To: , , , , CC: , , , , "Claudiu Beznea" Subject: [PATCH 17/19] clk: at91: clk-sam9x60-pll: re-factor to support plls with multiple outputs Date: Wed, 15 Jul 2020 14:24:25 +0300 Message-ID: <1594812267-6697-18-git-send-email-claudiu.beznea@microchip.com> X-Mailer: git-send-email 2.7.4 In-Reply-To: <1594812267-6697-1-git-send-email-claudiu.beznea@microchip.com> References: <1594812267-6697-1-git-send-email-claudiu.beznea@microchip.com> MIME-Version: 1.0 Content-Type: text/plain Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Some of the SAMA7G5 PLLs support multiple outputs (e.g. AUDIO PLL). For these, split the PLL clock in two: fractional clock and divider clock. In case PLLs supports multiple outputs (since these outputs are dividers (with different settings) sharing the same fractional part), it will register one fractional clock and multiple divider clocks (dividers sharing the fractional clock). Signed-off-by: Claudiu Beznea --- drivers/clk/at91/clk-sam9x60-pll.c | 547 +++++++++++++++++++++++++------------ drivers/clk/at91/pmc.h | 22 +- drivers/clk/at91/sam9x60.c | 50 +++- 3 files changed, 433 insertions(+), 186 deletions(-) diff --git a/drivers/clk/at91/clk-sam9x60-pll.c b/drivers/clk/at91/clk-sam9x60-pll.c index 13e15bd48770..b473298ef7e6 100644 --- a/drivers/clk/at91/clk-sam9x60-pll.c +++ b/drivers/clk/at91/clk-sam9x60-pll.c @@ -25,20 +25,31 @@ #define FCORE_MIN (600000000) #define FCORE_MAX (1200000000) -#define PLL_MAX_ID 1 +#define PLL_MAX_ID 7 -struct sam9x60_pll { - struct clk_hw hw; +struct sam9x60_pll_core { struct regmap *regmap; spinlock_t *lock; const struct clk_pll_characteristics *characteristics; - u32 frac; + const struct clk_pll_layout *layout; + struct clk_hw hw; u8 id; - u8 div; +}; + +struct sam9x60_frac { + struct sam9x60_pll_core core; + u32 frac; u16 mul; }; -#define to_sam9x60_pll(hw) container_of(hw, struct sam9x60_pll, hw) +struct sam9x60_div { + struct sam9x60_pll_core core; + u8 div; +}; + +#define to_sam9x60_pll_core(hw) container_of(hw, struct sam9x60_pll_core, hw) +#define to_sam9x60_frac(core) container_of(core, struct sam9x60_frac, core) +#define to_sam9x60_div(core) container_of(core, struct sam9x60_div, core) static inline bool sam9x60_pll_ready(struct regmap *regmap, int id) { @@ -49,43 +60,53 @@ static inline bool sam9x60_pll_ready(struct regmap *regmap, int id) return !!(status & BIT(id)); } -static int sam9x60_pll_prepare(struct clk_hw *hw) +static bool sam9x60_frac_pll_ready(struct regmap *regmap, u8 id) { - struct sam9x60_pll *pll = to_sam9x60_pll(hw); - struct regmap *regmap = pll->regmap; - unsigned long flags; - u8 div; - u16 mul; - u32 val, frac; + return sam9x60_pll_ready(regmap, id); +} - spin_lock_irqsave(pll->lock, flags); - regmap_write(regmap, AT91_PMC_PLL_UPDT, pll->id); +static unsigned long sam9x60_frac_pll_recalc_rate(struct clk_hw *hw, + unsigned long parent_rate) +{ + struct sam9x60_pll_core *core = to_sam9x60_pll_core(hw); + struct sam9x60_frac *frac = to_sam9x60_frac(core); - regmap_read(regmap, AT91_PMC_PLL_CTRL0, &val); - div = FIELD_GET(PMC_PLL_CTRL0_DIV_MSK, val); + return (parent_rate * (frac->mul + 1) + + ((u64)parent_rate * frac->frac >> 22)); +} +static int sam9x60_frac_pll_prepare(struct clk_hw *hw) +{ + struct sam9x60_pll_core *core = to_sam9x60_pll_core(hw); + struct sam9x60_frac *frac = to_sam9x60_frac(core); + struct regmap *regmap = core->regmap; + unsigned int val, cfrac, cmul; + unsigned long flags; + + spin_lock_irqsave(core->lock, flags); + + regmap_update_bits(regmap, AT91_PMC_PLL_UPDT, + AT91_PMC_PLL_UPDT_ID_MSK, core->id); regmap_read(regmap, AT91_PMC_PLL_CTRL1, &val); - mul = FIELD_GET(PMC_PLL_CTRL1_MUL_MSK, val); - frac = FIELD_GET(PMC_PLL_CTRL1_FRACR_MSK, val); + cmul = (val & core->layout->mul_mask) >> core->layout->mul_shift; + cfrac = (val & core->layout->frac_mask) >> core->layout->frac_shift; - if (sam9x60_pll_ready(regmap, pll->id) && - (div == pll->div && mul == pll->mul && frac == pll->frac)) { - spin_unlock_irqrestore(pll->lock, flags); - return 0; - } + if (sam9x60_frac_pll_ready(regmap, core->id) && + (cmul == frac->mul && cfrac == frac->frac)) + goto unlock; - /* Recommended value for AT91_PMC_PLL_ACR */ - if (pll->characteristics->upll) + /* Recommended value for PMC_PLL_ACR */ + if (core->characteristics->upll) val = AT91_PMC_PLL_ACR_DEFAULT_UPLL; else val = AT91_PMC_PLL_ACR_DEFAULT_PLLA; regmap_write(regmap, AT91_PMC_PLL_ACR, val); regmap_write(regmap, AT91_PMC_PLL_CTRL1, - FIELD_PREP(PMC_PLL_CTRL1_MUL_MSK, pll->mul) | - FIELD_PREP(PMC_PLL_CTRL1_FRACR_MSK, pll->frac)); + (frac->mul << core->layout->mul_shift) | + (frac->frac << core->layout->frac_shift)); - if (pll->characteristics->upll) { + if (core->characteristics->upll) { /* Enable the UTMI internal bandgap */ val |= AT91_PMC_PLL_ACR_UTMIBG; regmap_write(regmap, AT91_PMC_PLL_ACR, val); @@ -100,229 +121,409 @@ static int sam9x60_pll_prepare(struct clk_hw *hw) } regmap_update_bits(regmap, AT91_PMC_PLL_UPDT, - AT91_PMC_PLL_UPDT_UPDATE, AT91_PMC_PLL_UPDT_UPDATE); + AT91_PMC_PLL_UPDT_UPDATE | AT91_PMC_PLL_UPDT_ID_MSK, + AT91_PMC_PLL_UPDT_UPDATE | core->id); - regmap_write(regmap, AT91_PMC_PLL_CTRL0, - AT91_PMC_PLL_CTRL0_ENLOCK | AT91_PMC_PLL_CTRL0_ENPLL | - AT91_PMC_PLL_CTRL0_ENPLLCK | pll->div); + 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_UPDATE); + AT91_PMC_PLL_UPDT_UPDATE | AT91_PMC_PLL_UPDT_ID_MSK, + AT91_PMC_PLL_UPDT_UPDATE | core->id); - while (!sam9x60_pll_ready(regmap, pll->id)) + while (!sam9x60_pll_ready(regmap, core->id)) cpu_relax(); - spin_unlock_irqrestore(pll->lock, flags); +unlock: + spin_unlock_irqrestore(core->lock, flags); return 0; } -static int sam9x60_pll_is_prepared(struct clk_hw *hw) +static void sam9x60_frac_pll_unprepare(struct clk_hw *hw) { - struct sam9x60_pll *pll = to_sam9x60_pll(hw); + struct sam9x60_pll_core *core = to_sam9x60_pll_core(hw); + struct regmap *regmap = core->regmap; + unsigned long flags; - return sam9x60_pll_ready(pll->regmap, pll->id); + spin_lock_irqsave(core->lock, flags); + + regmap_update_bits(regmap, AT91_PMC_PLL_UPDT, + AT91_PMC_PLL_UPDT_ID_MSK, core->id); + + regmap_update_bits(regmap, AT91_PMC_PLL_CTRL0, AT91_PMC_PLL_CTRL0_ENPLL, 0); + + if (core->characteristics->upll) + regmap_update_bits(regmap, AT91_PMC_PLL_ACR, + AT91_PMC_PLL_ACR_UTMIBG | AT91_PMC_PLL_ACR_UTMIVR, 0); + + 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); + + spin_unlock_irqrestore(core->lock, flags); } -static void sam9x60_pll_unprepare(struct clk_hw *hw) +static int sam9x60_frac_pll_is_prepared(struct clk_hw *hw) { - struct sam9x60_pll *pll = to_sam9x60_pll(hw); - unsigned long flags; + struct sam9x60_pll_core *core = to_sam9x60_pll_core(hw); + + return sam9x60_pll_ready(core->regmap, core->id); +} - spin_lock_irqsave(pll->lock, flags); +static long sam9x60_frac_pll_compute_mul_frac(struct sam9x60_pll_core *core, + unsigned long rate, + unsigned long parent_rate, + bool update) +{ + struct sam9x60_frac *frac = to_sam9x60_frac(core); + unsigned long tmprate, remainder; + unsigned long nmul = 0; + unsigned long nfrac = 0; - regmap_write(pll->regmap, AT91_PMC_PLL_UPDT, pll->id); + if (rate < FCORE_MIN || rate > FCORE_MAX) + return -ERANGE; - regmap_update_bits(pll->regmap, AT91_PMC_PLL_CTRL0, - AT91_PMC_PLL_CTRL0_ENPLLCK, 0); + /* + * Calculate the multiplier associated with the current + * divider that provide the closest rate to the requested one. + */ + nmul = mult_frac(rate, 1, parent_rate); + tmprate = mult_frac(parent_rate, nmul, 1); + remainder = rate - tmprate; - regmap_update_bits(pll->regmap, AT91_PMC_PLL_UPDT, - AT91_PMC_PLL_UPDT_UPDATE, AT91_PMC_PLL_UPDT_UPDATE); + if (remainder) { + nfrac = DIV_ROUND_CLOSEST_ULL((u64)remainder * (1 << 22), + parent_rate); - regmap_update_bits(pll->regmap, AT91_PMC_PLL_CTRL0, - AT91_PMC_PLL_CTRL0_ENPLL, 0); + tmprate += DIV_ROUND_CLOSEST_ULL((u64)nfrac * parent_rate, + (1 << 22)); + } - if (pll->characteristics->upll) - regmap_update_bits(pll->regmap, AT91_PMC_PLL_ACR, - AT91_PMC_PLL_ACR_UTMIBG | - AT91_PMC_PLL_ACR_UTMIVR, 0); + /* Check if resulted rate is a valid. */ + if (tmprate < FCORE_MIN || tmprate > FCORE_MAX) + return -ERANGE; - regmap_update_bits(pll->regmap, AT91_PMC_PLL_UPDT, - AT91_PMC_PLL_UPDT_UPDATE, AT91_PMC_PLL_UPDT_UPDATE); + if (update) { + frac->mul = nmul - 1; + frac->frac = nfrac; + } - spin_unlock_irqrestore(pll->lock, flags); + return tmprate; } -static unsigned long sam9x60_pll_recalc_rate(struct clk_hw *hw, - unsigned long parent_rate) +static long sam9x60_frac_pll_round_rate(struct clk_hw *hw, unsigned long rate, + unsigned long *parent_rate) { - struct sam9x60_pll *pll = to_sam9x60_pll(hw); + struct sam9x60_pll_core *core = to_sam9x60_pll_core(hw); - return DIV_ROUND_CLOSEST_ULL((parent_rate * (pll->mul + 1) + - ((u64)parent_rate * pll->frac >> 22)), (pll->div + 1)); + return sam9x60_frac_pll_compute_mul_frac(core, rate, *parent_rate, false); } -static long sam9x60_pll_get_best_div_mul(struct sam9x60_pll *pll, - unsigned long rate, - unsigned long parent_rate, - bool update) +static int sam9x60_frac_pll_set_rate(struct clk_hw *hw, unsigned long rate, + unsigned long parent_rate) { - const struct clk_pll_characteristics *characteristics = - pll->characteristics; - unsigned long bestremainder = ULONG_MAX; - unsigned long maxdiv, mindiv, tmpdiv; - long bestrate = -ERANGE; - unsigned long bestdiv = 0; - unsigned long bestmul = 0; - unsigned long bestfrac = 0; - unsigned long long fcore = 0; + struct sam9x60_pll_core *core = to_sam9x60_pll_core(hw); - if (rate < characteristics->output[0].min || - rate > characteristics->output[0].max) - return -ERANGE; + return sam9x60_frac_pll_compute_mul_frac(core, rate, parent_rate, true); +} - if (!pll->characteristics->upll) { - mindiv = parent_rate / rate; - if (mindiv < 2) - mindiv = 2; +static const struct clk_ops sam9x60_frac_pll_ops = { + .prepare = sam9x60_frac_pll_prepare, + .unprepare = sam9x60_frac_pll_unprepare, + .is_prepared = sam9x60_frac_pll_is_prepared, + .recalc_rate = sam9x60_frac_pll_recalc_rate, + .round_rate = sam9x60_frac_pll_round_rate, + .set_rate = sam9x60_frac_pll_set_rate, +}; - maxdiv = DIV_ROUND_UP(parent_rate * PLL_MUL_MAX, rate); - if (maxdiv > PLL_DIV_MAX) - maxdiv = PLL_DIV_MAX; - } else { - mindiv = maxdiv = UPLL_DIV; - } +static int sam9x60_div_pll_prepare(struct clk_hw *hw) +{ + 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 flags; + unsigned int val, cdiv; - for (tmpdiv = mindiv; tmpdiv <= maxdiv; tmpdiv++) { - unsigned long remainder; - unsigned long tmprate; - unsigned long tmpmul; - unsigned long tmpfrac = 0; + spin_lock_irqsave(core->lock, flags); + 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; - /* - * Calculate the multiplier associated with the current - * divider that provide the closest rate to the requested one. - */ - tmpmul = mult_frac(rate, tmpdiv, parent_rate); - tmprate = mult_frac(parent_rate, tmpmul, tmpdiv); - remainder = rate - tmprate; + /* Stop if enabled an nothing changed. */ + if (!!(val & core->layout->endiv_mask) && cdiv == div->div) + goto unlock; - if (remainder) { - tmpfrac = DIV_ROUND_CLOSEST_ULL((u64)remainder * tmpdiv * (1 << 22), - parent_rate); + regmap_update_bits(regmap, AT91_PMC_PLL_CTRL0, + core->layout->div_mask | core->layout->endiv_mask, + (div->div << core->layout->div_shift) | + (1 << core->layout->endiv_shift)); - tmprate += DIV_ROUND_CLOSEST_ULL((u64)tmpfrac * parent_rate, - tmpdiv * (1 << 22)); + 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); - if (tmprate > rate) - remainder = tmprate - rate; - else - remainder = rate - tmprate; - } + while (!sam9x60_pll_ready(regmap, core->id)) + cpu_relax(); + +unlock: + spin_unlock_irqrestore(core->lock, flags); + + return 0; +} + +static void sam9x60_div_pll_unprepare(struct clk_hw *hw) +{ + struct sam9x60_pll_core *core = to_sam9x60_pll_core(hw); + struct regmap *regmap = core->regmap; + unsigned long flags; + + spin_lock_irqsave(core->lock, flags); + + regmap_update_bits(regmap, AT91_PMC_PLL_UPDT, + AT91_PMC_PLL_UPDT_ID_MSK, core->id); + + regmap_update_bits(regmap, AT91_PMC_PLL_CTRL0, + core->layout->endiv_mask, 0); + + 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); + + spin_unlock_irqrestore(core->lock, flags); +} + +static int sam9x60_div_pll_is_prepared(struct clk_hw *hw) +{ + struct sam9x60_pll_core *core = to_sam9x60_pll_core(hw); + struct regmap *regmap = core->regmap; + unsigned long flags; + unsigned int val; + + spin_lock_irqsave(core->lock, flags); + + regmap_update_bits(regmap, AT91_PMC_PLL_UPDT, + AT91_PMC_PLL_UPDT_ID_MSK, core->id); + regmap_read(regmap, AT91_PMC_PLL_CTRL0, &val); + + spin_unlock_irqrestore(core->lock, flags); - fcore = parent_rate * (tmpmul + 1) + - ((u64)parent_rate * tmpfrac >> 22); - if (fcore < FCORE_MIN || fcore > FCORE_MAX) + return !!(val & core->layout->endiv_mask); +} + +static unsigned long sam9x60_div_pll_recalc_rate(struct clk_hw *hw, + unsigned long parent_rate) +{ + struct sam9x60_pll_core *core = to_sam9x60_pll_core(hw); + struct sam9x60_div *div = to_sam9x60_div(core); + + return DIV_ROUND_CLOSEST_ULL(parent_rate, (div->div + 1)); +} + +static long sam9x60_div_pll_compute_div(struct sam9x60_pll_core *core, + unsigned long *parent_rate, + unsigned long rate) +{ + const struct clk_pll_characteristics *characteristics = + core->characteristics; + struct clk_hw *parent = clk_hw_get_parent(&core->hw); + unsigned long tmp_rate, tmp_parent_rate, tmp_diff; + long best_diff = -1, best_rate = -EINVAL; + u32 divid, best_div; + + if (!rate) + return 0; + + if (rate < characteristics->output[0].min || + rate > characteristics->output[0].max) + return -ERANGE; + + for (divid = 1; divid < core->layout->div_mask; divid++) { + tmp_parent_rate = clk_hw_round_rate(parent, rate * divid); + if (!tmp_parent_rate) continue; - /* - * Compare the remainder with the best remainder found until - * now and elect a new best multiplier/divider pair if the - * current remainder is smaller than the best one. - */ - if (remainder < bestremainder) { - bestremainder = remainder; - bestdiv = tmpdiv; - bestmul = tmpmul; - bestrate = tmprate; - bestfrac = tmpfrac; + tmp_rate = DIV_ROUND_CLOSEST_ULL(tmp_parent_rate, divid); + tmp_diff = abs(rate - tmp_rate); + + if (best_diff < 0 || best_diff > tmp_diff) { + *parent_rate = tmp_parent_rate; + best_rate = tmp_rate; + best_diff = tmp_diff; + best_div = divid; } - /* We've found a perfect match! */ - if (!remainder) + if (!best_diff) break; } - /* Check if bestrate is a valid output rate */ - if (fcore < FCORE_MIN || fcore > FCORE_MAX || - bestrate < characteristics->output[0].min || - bestrate > characteristics->output[0].max) + if (best_rate < characteristics->output[0].min || + best_rate > characteristics->output[0].max) return -ERANGE; - if (update) { - pll->div = bestdiv - 1; - pll->mul = bestmul - 1; - pll->frac = bestfrac; - } - - return bestrate; + return best_rate; } -static long sam9x60_pll_round_rate(struct clk_hw *hw, unsigned long rate, - unsigned long *parent_rate) +static long sam9x60_div_pll_round_rate(struct clk_hw *hw, unsigned long rate, + unsigned long *parent_rate) { - struct sam9x60_pll *pll = to_sam9x60_pll(hw); + struct sam9x60_pll_core *core = to_sam9x60_pll_core(hw); - return sam9x60_pll_get_best_div_mul(pll, rate, *parent_rate, false); + return sam9x60_div_pll_compute_div(core, parent_rate, rate); } -static int sam9x60_pll_set_rate(struct clk_hw *hw, unsigned long rate, - unsigned long parent_rate) +static int sam9x60_div_pll_set_rate(struct clk_hw *hw, unsigned long rate, + unsigned long parent_rate) { - struct sam9x60_pll *pll = to_sam9x60_pll(hw); + struct sam9x60_pll_core *core = to_sam9x60_pll_core(hw); + struct sam9x60_div *div = to_sam9x60_div(core); + + div->div = DIV_ROUND_CLOSEST(parent_rate, rate) - 1; - return sam9x60_pll_get_best_div_mul(pll, rate, parent_rate, true); + return 0; } -static const struct clk_ops pll_ops = { - .prepare = sam9x60_pll_prepare, - .unprepare = sam9x60_pll_unprepare, - .is_prepared = sam9x60_pll_is_prepared, - .recalc_rate = sam9x60_pll_recalc_rate, - .round_rate = sam9x60_pll_round_rate, - .set_rate = sam9x60_pll_set_rate, +static const struct clk_ops sam9x60_div_pll_ops = { + .prepare = sam9x60_div_pll_prepare, + .unprepare = sam9x60_div_pll_unprepare, + .is_prepared = sam9x60_div_pll_is_prepared, + .recalc_rate = sam9x60_div_pll_recalc_rate, + .round_rate = sam9x60_div_pll_round_rate, + .set_rate = sam9x60_div_pll_set_rate, }; struct clk_hw * __init -sam9x60_clk_register_pll(struct regmap *regmap, spinlock_t *lock, - const char *name, const char *parent_name, u8 id, - const struct clk_pll_characteristics *characteristics) +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) { - struct sam9x60_pll *pll; + struct sam9x60_frac *frac; struct clk_hw *hw; struct clk_init_data init; - unsigned int pllr; + unsigned long parent_rate, flags; + unsigned int val; int ret; - if (id > PLL_MAX_ID) + if (id > PLL_MAX_ID || !lock || !parent_hw) return ERR_PTR(-EINVAL); - pll = kzalloc(sizeof(*pll), GFP_KERNEL); - if (!pll) + frac = kzalloc(sizeof(*frac), GFP_KERNEL); + if (!frac) return ERR_PTR(-ENOMEM); init.name = name; - init.ops = &pll_ops; 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; + + frac->core.id = id; + frac->core.hw.init = &init; + frac->core.characteristics = characteristics; + frac->core.layout = layout; + frac->core.regmap = regmap; + frac->core.lock = lock; + + spin_lock_irqsave(frac->core.lock, flags); + if (sam9x60_pll_ready(regmap, id)) { + regmap_update_bits(regmap, AT91_PMC_PLL_UPDT, + AT91_PMC_PLL_UPDT_ID_MSK, id); + regmap_read(regmap, AT91_PMC_PLL_CTRL1, &val); + frac->mul = FIELD_GET(PMC_PLL_CTRL1_MUL_MSK, val); + frac->frac = FIELD_GET(PMC_PLL_CTRL1_FRACR_MSK, val); + } else { + /* + * This means the PLL is not setup by bootloaders. In this + * case we need to set the minimum rate for it. Otherwise + * a clock child of this PLL may be enabled before setting + * its rate leading to enabling this PLL with unsupported + * rate. This will lead to PLL not being locked at all. + */ + parent_rate = clk_hw_get_rate(parent_hw); + if (!parent_rate) { + hw = ERR_PTR(-EINVAL); + goto free; + } + + ret = sam9x60_frac_pll_compute_mul_frac(&frac->core, FCORE_MIN, + parent_rate, true); + if (ret <= 0) { + hw = ERR_PTR(ret); + goto free; + } + } + spin_unlock_irqrestore(frac->core.lock, flags); + + hw = &frac->core.hw; + ret = clk_hw_register(NULL, hw); + if (ret) { + kfree(frac); + hw = ERR_PTR(ret); + } - pll->id = id; - pll->hw.init = &init; - pll->characteristics = characteristics; - pll->regmap = regmap; - pll->lock = lock; + return hw; + +free: + spin_unlock_irqrestore(frac->core.lock, flags); + kfree(frac); + return hw; +} + +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) +{ + struct sam9x60_div *div; + struct clk_hw *hw; + struct clk_init_data init; + unsigned long flags; + unsigned int val; + int ret; + + if (id > PLL_MAX_ID || !lock) + return ERR_PTR(-EINVAL); + + div = kzalloc(sizeof(*div), GFP_KERNEL); + if (!div) + return ERR_PTR(-ENOMEM); + + init.name = name; + 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; + + div->core.id = id; + div->core.hw.init = &init; + div->core.characteristics = characteristics; + div->core.layout = layout; + div->core.regmap = regmap; + div->core.lock = lock; + + spin_lock_irqsave(div->core.lock, flags); + + 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); - regmap_write(regmap, AT91_PMC_PLL_UPDT, id); - regmap_read(regmap, AT91_PMC_PLL_CTRL0, &pllr); - pll->div = FIELD_GET(PMC_PLL_CTRL0_DIV_MSK, pllr); - regmap_read(regmap, AT91_PMC_PLL_CTRL1, &pllr); - pll->mul = FIELD_GET(PMC_PLL_CTRL1_MUL_MSK, pllr); + spin_unlock_irqrestore(div->core.lock, flags); - hw = &pll->hw; + hw = &div->core.hw; ret = clk_hw_register(NULL, hw); if (ret) { - kfree(pll); + kfree(div); hw = ERR_PTR(ret); } diff --git a/drivers/clk/at91/pmc.h b/drivers/clk/at91/pmc.h index 8d3e22f566cf..6340b9be8205 100644 --- a/drivers/clk/at91/pmc.h +++ b/drivers/clk/at91/pmc.h @@ -54,8 +54,14 @@ struct clk_master_characteristics { struct clk_pll_layout { u32 pllr_mask; - u16 mul_mask; + u32 mul_mask; + u32 frac_mask; + u32 div_mask; + u32 endiv_mask; u8 mul_shift; + u8 frac_shift; + u8 div_shift; + u8 endiv_shift; }; extern const struct clk_pll_layout at91rm9200_pll_layout; @@ -181,9 +187,17 @@ at91_clk_register_plldiv(struct regmap *regmap, const char *name, const char *parent_name); struct clk_hw * __init -sam9x60_clk_register_pll(struct regmap *regmap, spinlock_t *lock, - const char *name, const char *parent_name, u8 id, - const struct clk_pll_characteristics *characteristics); +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); + +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); 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 f2306615c7e7..88574d799208 100644 --- a/drivers/clk/at91/sam9x60.c +++ b/drivers/clk/at91/sam9x60.c @@ -42,6 +42,20 @@ static const struct clk_pll_characteristics upll_characteristics = { .upll = true, }; +static const struct clk_pll_layout pll_frac_layout = { + .mul_mask = GENMASK(31, 24), + .frac_mask = GENMASK(21, 0), + .mul_shift = 24, + .frac_shift = 0, +}; + +static const struct clk_pll_layout pll_div_layout = { + .div_mask = GENMASK(7, 0), + .endiv_mask = BIT(29), + .div_shift = 0, + .endiv_shift = 29, +}; + static const struct clk_programmable_layout sam9x60_programmable_layout = { .pres_mask = 0xff, .pres_shift = 8, @@ -156,6 +170,7 @@ static void __init sam9x60_pmc_setup(struct device_node *np) const char *td_slck_name, *md_slck_name, *mainxtal_name; struct pmc_data *sam9x60_pmc; const char *parent_names[6]; + struct clk_hw *main_osc_hw; struct regmap *regmap; struct clk_hw *hw; int i; @@ -200,6 +215,7 @@ static void __init sam9x60_pmc_setup(struct device_node *np) bypass); if (IS_ERR(hw)) goto err_free; + main_osc_hw = hw; parent_names[0] = "main_rc_osc"; parent_names[1] = "main_osc"; @@ -209,15 +225,31 @@ static void __init sam9x60_pmc_setup(struct device_node *np) sam9x60_pmc->chws[PMC_MAIN] = hw; - hw = sam9x60_clk_register_pll(regmap, &pmc_pll_lock, "pllack", - "mainck", 0, &plla_characteristics); + 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); + 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); if (IS_ERR(hw)) goto err_free; sam9x60_pmc->chws[PMC_PLLACK] = hw; - hw = sam9x60_clk_register_pll(regmap, &pmc_pll_lock, "upllck", - "main_osc", 1, &upll_characteristics); + hw = sam9x60_clk_register_frac_pll(regmap, &pmc_pll_lock, "upllck_fracck", + "main_osc", main_osc_hw, 1, + &upll_characteristics, + &pll_frac_layout, false); + 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); if (IS_ERR(hw)) goto err_free; @@ -225,7 +257,7 @@ static void __init sam9x60_pmc_setup(struct device_node *np) parent_names[0] = md_slck_name; parent_names[1] = "mainck"; - parent_names[2] = "pllack"; + parent_names[2] = "pllack_divck"; hw = at91_clk_register_master(regmap, "masterck", 3, parent_names, &sam9x60_master_layout, &mck_characteristics); @@ -234,8 +266,8 @@ static void __init sam9x60_pmc_setup(struct device_node *np) sam9x60_pmc->chws[PMC_MCK] = hw; - parent_names[0] = "pllack"; - parent_names[1] = "upllck"; + parent_names[0] = "pllack_divck"; + parent_names[1] = "upllck_divck"; parent_names[2] = "main_osc"; hw = sam9x60_clk_register_usb(regmap, "usbck", parent_names, 3); if (IS_ERR(hw)) @@ -245,8 +277,8 @@ static void __init sam9x60_pmc_setup(struct device_node *np) parent_names[1] = td_slck_name; parent_names[2] = "mainck"; parent_names[3] = "masterck"; - parent_names[4] = "pllack"; - parent_names[5] = "upllck"; + parent_names[4] = "pllack_divck"; + parent_names[5] = "upllck_divck"; for (i = 0; i < 8; i++) { char name[6]; -- 2.7.4