From patchwork Thu May 20 19:13:05 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Dario Binacchi X-Patchwork-Id: 443691 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=-15.8 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,FREEMAIL_FORGED_FROMDOMAIN,FREEMAIL_FROM, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,USER_AGENT_GIT autolearn=unavailable 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 8CA9CC43461 for ; Thu, 20 May 2021 19:13:37 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 70B52613BA for ; Thu, 20 May 2021 19:13:37 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S236859AbhETTO5 (ORCPT ); Thu, 20 May 2021 15:14:57 -0400 Received: from smtp-34-i2.italiaonline.it ([213.209.12.34]:37658 "EHLO libero.it" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S236972AbhETTO4 (ORCPT ); Thu, 20 May 2021 15:14:56 -0400 Received: from passgat-Modern-14-A10M.homenet.telecomitalia.it ([82.60.150.250]) by smtp-34.iol.local with ESMTPA id jo6clK7DY5WrZjo6slTD9e; Thu, 20 May 2021 21:13:32 +0200 x-libjamoibt: 1601 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=libero.it; s=s2021; t=1621538012; bh=NTRyHVQakJ7HbxsvPHLac4pXGhyYyUqXNfzgdmxqOpc=; h=From; b=uw0vC90iPXNlgBBfx7uYiCvuBZSElnBWIF2dlfKAQIVSobFlj3J0OLadzUFMdhzqL lxHdIuDJkMoWB8I4bdFwxkLcBjWzGcDJQ0Z07jONfFms4rQIrzfxRDkO5Wxgjpn1yZ Q2KFAnPWHo1g449uFp374+wKG85EIDlGS0tUWFLXIa5QrgD9wNk4KySK25RR/56FQI ebsdd0okXeX8/J/XFIjaTRWdKOqpaesxMs8mhb0ZxklZPr63sGohTCb+9ho0A3YC0J bVHOc6tJfJ3C6eCX54zxUFkMVZ+A3gGgmMf8V/GIeUrRJ+Ca9T6x1c+OYYG1uVWbIo krUA4Ulr4wFxg== X-CNFS-Analysis: v=2.4 cv=W4/96Tak c=1 sm=1 tr=0 ts=60a6b4dc cx=a_exe a=QSJ1svMVA5tvcuOEAX2Bgw==:117 a=QSJ1svMVA5tvcuOEAX2Bgw==:17 a=IkcTkHD0fZMA:10 a=VwQbUJbxAAAA:8 a=o_rbLAqdoS-kjYQczG8A:9 a=QEXdDO2ut3YA:10 a=5yUOnwQy5QICz8m5uxDm:22 a=AjGcO6oz07-iQ99wixmX:22 a=pHzHmUro8NiASowvMSCR:22 a=xoEH_sTeL_Rfw54TyV31:22 From: Dario Binacchi To: linux-kernel@vger.kernel.org Cc: Lee Jones , =?utf-8?q?Beno=C3=AEt_Cousson?= , Rob Herring , Tero Kristo , Michael Turquette , Stephen Boyd , Dario Binacchi , Tony Lindgren , linux-clk@vger.kernel.org, linux-omap@vger.kernel.org Subject: [PATCH v6 5/5] clk: ti: add am33xx/am43xx spread spectrum clock support Date: Thu, 20 May 2021 21:13:05 +0200 Message-Id: <20210520191306.21711-6-dariobin@libero.it> X-Mailer: git-send-email 2.17.1 In-Reply-To: <20210520191306.21711-1-dariobin@libero.it> References: <20210520191306.21711-1-dariobin@libero.it> MIME-Version: 1.0 X-CMAE-Envelope: MS4xfAPM6ZRb6svY/nWH8qORf9XFgGs/4yr24H/9Qr+yRyj+8avX1F++T0TG44RavE5Eqq/thtXhLk6Ma9wAbiQOmNYgQ5uKiW8flkQy+eBhxBgb/JsqD4ZJ KuFuPC8uMlXXLBKkYmM3HGtaZdYpx3XDGIkgiBN59Cv39eLGMkiN6zoIpo5T6g/TpRpNFzyrqy37nfwar5ErA7Qrj1bJzYzA+LHfkgHVgmhiyDRxyeZdWtBs 7fvd9ct6YZuMqDi+PNx47BLBdm/I69l6GVXdAqLJ/C3v4sZW8uDdvosdG29A/0tJPGd7FJyO8yVMhETKnYqoRZL90fw/abxrmcSdI2BZSZwvPwG3lt5ezUj4 c+fGZBo/lj6NCgoRvXWws00mnPuft3IAK3ar4gcazxCgf9Au4w6Pu0qLGQ8EVGb8ezAKL/7hFdY9fgS0zwI55gL7C1jTXLbch0OdwnKqoEBUZWEXb0bLkas+ gXbxWd9MWmb7HWTJRepeVCe8n4RNkJ+ncEUPqryFwpk+9s73F1d8E9g9dcmz/PJjUDVgkIc3SKAgC44rbeitE1O0tSZUJbKVoVIiCw== Precedence: bulk List-ID: X-Mailing-List: linux-omap@vger.kernel.org The patch enables spread spectrum clocking (SSC) for MPU and LCD PLLs. As reported by the TI spruh73x/spruhl7x RM, SSC is only supported for the DISP/LCD and MPU PLLs on am33xx/am43xx. SSC is not supported for DDR, PER, and CORE PLLs. Calculating the required values and setting the registers accordingly was taken from the set_mpu_spreadspectrum routine contained in the arch/arm/mach-omap2/am33xx/clock_am33xx.c file of the u-boot project. In locked condition, DPLL output clock = CLKINP *[M/N]. In case of SSC enabled, the reference manual explains that there is a restriction of range of M values. Since the omap2_dpll_round_rate routine attempts to select the minimum possible N, the value of M obtained is not guaranteed to be within the range required. With the new "ti,min-div" parameter it is possible to increase N and consequently M to satisfy the constraint imposed by SSC. Signed-off-by: Dario Binacchi Reviewed-by: Tero Kristo --- Changes in v6: - Add Tero Kristo review tag. Changes in v5: - Remove ssc_ack_mask field from dpll_data structure. It was not used. - Change ssc_downspread type from u8 to bool in dpll_data structure. Changes in v4: - Update commit message. Changes in v3: - Use "ti,ssc-modfreq-hz" binding instead of "ti,ssc-modfreq". Changes in v2: - Move the DT changes to the previous patch in the series. drivers/clk/ti/dpll.c | 39 ++++++++++++++++++ drivers/clk/ti/dpll3xxx.c | 85 +++++++++++++++++++++++++++++++++++++++ include/linux/clk/ti.h | 22 ++++++++++ 3 files changed, 146 insertions(+) diff --git a/drivers/clk/ti/dpll.c b/drivers/clk/ti/dpll.c index d6f1ac5b53e1..e9f9aee936ae 100644 --- a/drivers/clk/ti/dpll.c +++ b/drivers/clk/ti/dpll.c @@ -290,7 +290,9 @@ static void __init of_ti_dpll_setup(struct device_node *node, struct clk_init_data *init = NULL; const char **parent_names = NULL; struct dpll_data *dd = NULL; + int ssc_clk_index; u8 dpll_mode = 0; + u32 min_div; dd = kmemdup(ddt, sizeof(*dd), GFP_KERNEL); clk_hw = kzalloc(sizeof(*clk_hw), GFP_KERNEL); @@ -345,6 +347,27 @@ static void __init of_ti_dpll_setup(struct device_node *node, if (dd->autoidle_mask) { if (ti_clk_get_reg_addr(node, 3, &dd->autoidle_reg)) goto cleanup; + + ssc_clk_index = 4; + } else { + ssc_clk_index = 3; + } + + if (dd->ssc_deltam_int_mask && dd->ssc_deltam_frac_mask && + dd->ssc_modfreq_mant_mask && dd->ssc_modfreq_exp_mask) { + if (ti_clk_get_reg_addr(node, ssc_clk_index++, + &dd->ssc_deltam_reg)) + goto cleanup; + + if (ti_clk_get_reg_addr(node, ssc_clk_index++, + &dd->ssc_modfreq_reg)) + goto cleanup; + + of_property_read_u32(node, "ti,ssc-modfreq-hz", + &dd->ssc_modfreq); + of_property_read_u32(node, "ti,ssc-deltam", &dd->ssc_deltam); + dd->ssc_downspread = + of_property_read_bool(node, "ti,ssc-downspread"); } if (of_property_read_bool(node, "ti,low-power-stop")) @@ -356,6 +379,10 @@ static void __init of_ti_dpll_setup(struct device_node *node, if (of_property_read_bool(node, "ti,lock")) dpll_mode |= 1 << DPLL_LOCKED; + if (!of_property_read_u32(node, "ti,min-div", &min_div) && + min_div > dd->min_divider) + dd->min_divider = min_div; + if (dpll_mode) dd->modes = dpll_mode; @@ -585,8 +612,14 @@ static void __init of_ti_am3_no_gate_dpll_setup(struct device_node *node) const struct dpll_data dd = { .idlest_mask = 0x1, .enable_mask = 0x7, + .ssc_enable_mask = 0x1 << 12, + .ssc_downspread_mask = 0x1 << 14, .mult_mask = 0x7ff << 8, .div1_mask = 0x7f, + .ssc_deltam_int_mask = 0x3 << 18, + .ssc_deltam_frac_mask = 0x3ffff, + .ssc_modfreq_mant_mask = 0x7f, + .ssc_modfreq_exp_mask = 0x7 << 8, .max_multiplier = 2047, .max_divider = 128, .min_divider = 1, @@ -645,8 +678,14 @@ static void __init of_ti_am3_dpll_setup(struct device_node *node) const struct dpll_data dd = { .idlest_mask = 0x1, .enable_mask = 0x7, + .ssc_enable_mask = 0x1 << 12, + .ssc_downspread_mask = 0x1 << 14, .mult_mask = 0x7ff << 8, .div1_mask = 0x7f, + .ssc_deltam_int_mask = 0x3 << 18, + .ssc_deltam_frac_mask = 0x3ffff, + .ssc_modfreq_mant_mask = 0x7f, + .ssc_modfreq_exp_mask = 0x7 << 8, .max_multiplier = 2047, .max_divider = 128, .min_divider = 1, diff --git a/drivers/clk/ti/dpll3xxx.c b/drivers/clk/ti/dpll3xxx.c index 94d5b5fe9a2b..e32b3515f9e7 100644 --- a/drivers/clk/ti/dpll3xxx.c +++ b/drivers/clk/ti/dpll3xxx.c @@ -291,6 +291,88 @@ static void _lookup_sddiv(struct clk_hw_omap *clk, u8 *sd_div, u16 m, u8 n) *sd_div = sd; } +/** + * omap3_noncore_dpll_ssc_program - set spread-spectrum clocking registers + * @clk: struct clk * of DPLL to set + * + * Enable the DPLL spread spectrum clocking if frequency modulation and + * frequency spreading have been set, otherwise disable it. + */ +static void omap3_noncore_dpll_ssc_program(struct clk_hw_omap *clk) +{ + struct dpll_data *dd = clk->dpll_data; + unsigned long ref_rate; + u32 v, ctrl, mod_freq_divider, exponent, mantissa; + u32 deltam_step, deltam_ceil; + + ctrl = ti_clk_ll_ops->clk_readl(&dd->control_reg); + + if (dd->ssc_modfreq && dd->ssc_deltam) { + ctrl |= dd->ssc_enable_mask; + + if (dd->ssc_downspread) + ctrl |= dd->ssc_downspread_mask; + else + ctrl &= ~dd->ssc_downspread_mask; + + ref_rate = clk_hw_get_rate(dd->clk_ref); + mod_freq_divider = + (ref_rate / dd->last_rounded_n) / (4 * dd->ssc_modfreq); + if (dd->ssc_modfreq > (ref_rate / 70)) + pr_warn("clock: SSC modulation frequency of DPLL %s greater than %ld\n", + __clk_get_name(clk->hw.clk), ref_rate / 70); + + exponent = 0; + mantissa = mod_freq_divider; + while ((mantissa > 127) && (exponent < 7)) { + exponent++; + mantissa /= 2; + } + if (mantissa > 127) + mantissa = 127; + + v = ti_clk_ll_ops->clk_readl(&dd->ssc_modfreq_reg); + v &= ~(dd->ssc_modfreq_mant_mask | dd->ssc_modfreq_exp_mask); + v |= mantissa << __ffs(dd->ssc_modfreq_mant_mask); + v |= exponent << __ffs(dd->ssc_modfreq_exp_mask); + ti_clk_ll_ops->clk_writel(v, &dd->ssc_modfreq_reg); + + deltam_step = dd->last_rounded_m * dd->ssc_deltam; + deltam_step /= 10; + if (dd->ssc_downspread) + deltam_step /= 2; + + deltam_step <<= __ffs(dd->ssc_deltam_int_mask); + deltam_step /= 100; + deltam_step /= mod_freq_divider; + if (deltam_step > 0xFFFFF) + deltam_step = 0xFFFFF; + + deltam_ceil = (deltam_step & dd->ssc_deltam_int_mask) >> + __ffs(dd->ssc_deltam_int_mask); + if (deltam_step & dd->ssc_deltam_frac_mask) + deltam_ceil++; + + if ((dd->ssc_downspread && + ((dd->last_rounded_m - (2 * deltam_ceil)) < 20 || + dd->last_rounded_m > 2045)) || + ((dd->last_rounded_m - deltam_ceil) < 20 || + (dd->last_rounded_m + deltam_ceil) > 2045)) + pr_warn("clock: SSC multiplier of DPLL %s is out of range\n", + __clk_get_name(clk->hw.clk)); + + v = ti_clk_ll_ops->clk_readl(&dd->ssc_deltam_reg); + v &= ~(dd->ssc_deltam_int_mask | dd->ssc_deltam_frac_mask); + v |= deltam_step << __ffs(dd->ssc_deltam_int_mask | + dd->ssc_deltam_frac_mask); + ti_clk_ll_ops->clk_writel(v, &dd->ssc_deltam_reg); + } else { + ctrl &= ~dd->ssc_enable_mask; + } + + ti_clk_ll_ops->clk_writel(ctrl, &dd->control_reg); +} + /** * omap3_noncore_dpll_program - set non-core DPLL M,N values directly * @clk: struct clk * of DPLL to set @@ -390,6 +472,9 @@ static int omap3_noncore_dpll_program(struct clk_hw_omap *clk, u16 freqsel) ti_clk_ll_ops->clk_writel(v, &dd->control_reg); } + if (dd->ssc_enable_mask) + omap3_noncore_dpll_ssc_program(clk); + /* We let the clock framework set the other output dividers later */ /* REVISIT: Set ramp-up delay? */ diff --git a/include/linux/clk/ti.h b/include/linux/clk/ti.h index c62f6fa6763d..3486f20a3753 100644 --- a/include/linux/clk/ti.h +++ b/include/linux/clk/ti.h @@ -63,6 +63,17 @@ struct clk_omap_reg { * @auto_recal_bit: bitshift of the driftguard enable bit in @control_reg * @recal_en_bit: bitshift of the PRM_IRQENABLE_* bit for recalibration IRQs * @recal_st_bit: bitshift of the PRM_IRQSTATUS_* bit for recalibration IRQs + * @ssc_deltam_reg: register containing the DPLL SSC frequency spreading + * @ssc_modfreq_reg: register containing the DPLL SSC modulation frequency + * @ssc_modfreq_mant_mask: mask of the mantissa component in @ssc_modfreq_reg + * @ssc_modfreq_exp_mask: mask of the exponent component in @ssc_modfreq_reg + * @ssc_enable_mask: mask of the DPLL SSC enable bit in @control_reg + * @ssc_downspread_mask: mask of the DPLL SSC low frequency only bit in + * @control_reg + * @ssc_modfreq: the DPLL SSC frequency modulation in kHz + * @ssc_deltam: the DPLL SSC frequency spreading in permille (10th of percent) + * @ssc_downspread: require the only low frequency spread of the DPLL in SSC + * mode * @flags: DPLL type/features (see below) * * Possible values for @flags: @@ -110,6 +121,17 @@ struct dpll_data { u8 auto_recal_bit; u8 recal_en_bit; u8 recal_st_bit; + struct clk_omap_reg ssc_deltam_reg; + struct clk_omap_reg ssc_modfreq_reg; + u32 ssc_deltam_int_mask; + u32 ssc_deltam_frac_mask; + u32 ssc_modfreq_mant_mask; + u32 ssc_modfreq_exp_mask; + u32 ssc_enable_mask; + u32 ssc_downspread_mask; + u32 ssc_modfreq; + u32 ssc_deltam; + bool ssc_downspread; u8 flags; };