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=-6.9 required=3.0 tests=DKIM_SIGNED,DKIM_VALID, DKIM_VALID_AU,FREEMAIL_FORGED_FROMDOMAIN,FREEMAIL_FROM, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH,MAILING_LIST_MULTI,SIGNED_OFF_BY, SPF_PASS,URIBL_BLOCKED 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 496B5C43441 for ; Sat, 17 Nov 2018 20:41:19 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id D0BF82080F for ; Sat, 17 Nov 2018 20:41:18 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=googlemail.com header.i=@googlemail.com header.b="bPl/vtlq" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org D0BF82080F Authentication-Results: mail.kernel.org; dmarc=fail (p=quarantine dis=none) header.from=googlemail.com Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=linux-kernel-owner@vger.kernel.org Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726822AbeKRG7J (ORCPT ); Sun, 18 Nov 2018 01:59:09 -0500 Received: from mail-ot1-f65.google.com ([209.85.210.65]:33780 "EHLO mail-ot1-f65.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726258AbeKRG7J (ORCPT ); Sun, 18 Nov 2018 01:59:09 -0500 Received: by mail-ot1-f65.google.com with SMTP id i20so18009853otl.0 for ; Sat, 17 Nov 2018 12:41:16 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=googlemail.com; s=20161025; h=mime-version:references:in-reply-to:from:date:message-id:subject:to :cc; bh=m2+mAg6blJw4ppf1aH729y3tyL0zaMquo01YHHvvCXk=; b=bPl/vtlqDZ25w3r43MPbOXNHWahhJroje5ZF8Cwt914MhaDs7j3dTkwOkGDkpJhFQJ gZbviVErkrcnKwMOOS5JKmqxv0VFZ0IoXknG9kJWzdi7blTt4IIkmGz+pj9f7ZL03Q/n Tf492KOMmULd8eomc3Vcz4/GmaT02/iTNX8wnKZz0yd+tUEcCa0ID1p2Ij6Res2Yo++A S+DrjUa9L+enLbfr/sBHfG7qGmcrbQWUwKbz+OfnEC8XXy0svIM362Dzd+Hry4oOdJOf EgARDAyGB8yaVv/4pbKJlsOR4T56MGyPKJ5UfB0sZKnGucIhnK1zeVpd8PGJMNIBEjrh oyeQ== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:mime-version:references:in-reply-to:from:date :message-id:subject:to:cc; bh=m2+mAg6blJw4ppf1aH729y3tyL0zaMquo01YHHvvCXk=; b=FJhh22B0wIKOuRpEx3ZZxWxk7n6C2D4VQGHexGGc2A3yvRiF43mccUXTURSd5Mo9Q6 m9J603U5L06aV1IUYVo4YgqtJeQMO6UwogVhPgTWII/9DNh0ypB12T1kOtc6PmZRinVP C9CFKV+q/aWm/vs8xaafj9Dx4M3O/aVsNCoD6DqgBZFqybogxroVFvvrU/qUFcfMpZOj lGulV8Zg7DaLRBapxKs8yNqhUurbuhWRuZ/N1EEcaUUMhhFJVL1MyoaxsMNahefDMQFz xnLc4mXlffMmVLRPwdEyELQwsag/3vJ1biw5IEPwckaqm5kOOL5aM0QqlflbkNEd2oF5 oRHA== X-Gm-Message-State: AGRZ1gJvULugpVJ750Q1ApFSrhgAX1Y86c8SO0V4Go2vbGdNJAhhtJIK 440VE95Jr2uIFenvG32RJDL4NQOSQi677DGqwB8= X-Google-Smtp-Source: AJdET5cNHdFEwoIAfZnT0wPMe1jgyGTIqIb+5GOYQmc53/h7C3lf4baa/xqcg/ePrQBtKHWy9WtvURl9HPAbABXpj14= X-Received: by 2002:a05:6830:2010:: with SMTP id e16mr9094666otp.86.1542487275504; Sat, 17 Nov 2018 12:41:15 -0800 (PST) MIME-Version: 1.0 References: <20181114131627.17766-1-narmstrong@baylibre.com> <20181114131627.17766-3-narmstrong@baylibre.com> In-Reply-To: <20181114131627.17766-3-narmstrong@baylibre.com> From: Martin Blumenstingl Date: Sat, 17 Nov 2018 21:41:04 +0100 Message-ID: Subject: Re: [PATCH v2 2/3] soc: amlogic: Add Meson GX Clock Measure driver To: Neil Armstrong Cc: khilman@baylibre.com, linux-amlogic@lists.infradead.org, linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org Content-Type: multipart/mixed; boundary="00000000000020b390057ae24eee" Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org --00000000000020b390057ae24eee Content-Type: text/plain; charset="UTF-8" Hi Neil, On Wed, Nov 14, 2018 at 2:18 PM Neil Armstrong wrote: > > The Amlogic Meson GX SoCs embeds a clock measurer IP to measure the internal > clock paths frequencies. I would remove "GX" from that sentence > The precision is determined by stepping into the divider until the counter > overflows. > The debugfs slows a pretty summary and each clock can be measured > individually aswell. > > The clock table covers all GX SoCs (GXBB, GXL & GXM) even if some clocks > are only present on GXBB or GXM (i.e. wave420l) but the counter returns > 0 when the clocks are invalid. > > Signed-off-by: Neil Armstrong looks good apart from a small comments (and a 32-bit SoC fix) below as this driver is not GX specific > --- > drivers/soc/amlogic/Kconfig | 8 + > drivers/soc/amlogic/Makefile | 1 + > drivers/soc/amlogic/meson-gx-clk-measure.c | 293 +++++++++++++++++++++ > 3 files changed, 302 insertions(+) > create mode 100644 drivers/soc/amlogic/meson-gx-clk-measure.c > > diff --git a/drivers/soc/amlogic/Kconfig b/drivers/soc/amlogic/Kconfig > index 2f282b472912..155868830773 100644 > --- a/drivers/soc/amlogic/Kconfig > +++ b/drivers/soc/amlogic/Kconfig > @@ -7,6 +7,14 @@ config MESON_CANVAS > help > Say yes to support the canvas IP for Amlogic SoCs. > > +config MESON_GX_CLK_MEASURE > + bool "Amlogic Meson GX SoC Clock Measure driver" please drop the GX from the name, I verified that it also works on Meson8 and Meson8b with very little changes > + depends on ARCH_MESON || COMPILE_TEST > + default ARCH_MESON > + help > + Say yes to support of Measuring a set of internal SoC clocks > + from the debugfs interface. > + > config MESON_GX_SOCINFO > bool "Amlogic Meson GX SoC Information driver" > depends on ARCH_MESON || COMPILE_TEST > diff --git a/drivers/soc/amlogic/Makefile b/drivers/soc/amlogic/Makefile > index 0ab16d35ac36..2cc0f9c2f715 100644 > --- a/drivers/soc/amlogic/Makefile > +++ b/drivers/soc/amlogic/Makefile > @@ -1,4 +1,5 @@ > obj-$(CONFIG_MESON_CANVAS) += meson-canvas.o > +obj-$(CONFIG_MESON_GX_CLK_MEASURE) += meson-gx-clk-measure.o > obj-$(CONFIG_MESON_GX_SOCINFO) += meson-gx-socinfo.o > obj-$(CONFIG_MESON_GX_PM_DOMAINS) += meson-gx-pwrc-vpu.o > obj-$(CONFIG_MESON_MX_SOCINFO) += meson-mx-socinfo.o > diff --git a/drivers/soc/amlogic/meson-gx-clk-measure.c b/drivers/soc/amlogic/meson-gx-clk-measure.c > new file mode 100644 > index 000000000000..da1a0001cef9 > --- /dev/null > +++ b/drivers/soc/amlogic/meson-gx-clk-measure.c > @@ -0,0 +1,293 @@ > +// SPDX-License-Identifier: GPL-2.0+ > +/* > + * Copyright (c) 2017 BayLibre, SAS nitpick; 2017-2018 > + * Author: Neil Armstrong > + */ > + > +#include > +#include > +#include > +#include > +#include > +#include > + > +#define MSR_CLK_DUTY 0x0 > +#define MSR_CLK_REG0 0x4 > +#define MSR_CLK_REG1 0x8 > +#define MSR_CLK_REG2 0xc > + > +#define MSR_CLK_DIV GENMASK(15, 0) I would call this MSR_DURATION (see my comment on the divider below) > +#define MSR_ENABLE BIT(16) > +#define MSR_CONT BIT(17) /* continuous measurement */ > +#define MSR_INTR BIT(18) /* interrupts */ > +#define MSR_RUN BIT(19) > +#define MSR_CLK_SRC GENMASK(26, 20) > +#define MSR_BUSY BIT(31) > + > +#define MSR_VAL_MASK GENMASK(15, 0) > + > +#define DIV_MIN 32 > +#define DIV_STEP 32 > +#define DIV_MAX 640 > + > +#define CLK_MSR_MAX 128 > + > +struct meson_gx_msr_id { > + struct meson_gx_msr *priv; > + unsigned int id; > + const char *name; > +}; > + > +struct meson_gx_msr { > + struct regmap *regmap; > + struct meson_gx_msr_id msr_table[CLK_MSR_MAX]; > +}; can you drop the "_gx" from these two structs and all functions below please? > + > +#define CLK_MSR_ID(__id, __name) \ > + [__id] = {.id = __id, .name = __name,} > + > +static struct meson_gx_msr_id clk_msr_gx[CLK_MSR_MAX] = { > + CLK_MSR_ID(0, "ring_osc_out_ee_0"), > + CLK_MSR_ID(1, "ring_osc_out_ee_1"), > + CLK_MSR_ID(2, "ring_osc_out_ee_2"), > + CLK_MSR_ID(3, "a53_ring_osc"), > + CLK_MSR_ID(4, "gp0_pll"), > + CLK_MSR_ID(6, "enci"), > + CLK_MSR_ID(7, "clk81"), > + CLK_MSR_ID(8, "encp"), > + CLK_MSR_ID(9, "encl"), > + CLK_MSR_ID(10, "vdac"), > + CLK_MSR_ID(11, "rgmii_tx"), > + CLK_MSR_ID(12, "pdm"), > + CLK_MSR_ID(13, "amclk"), > + CLK_MSR_ID(14, "fec_0"), > + CLK_MSR_ID(15, "fec_1"), > + CLK_MSR_ID(16, "fec_2"), > + CLK_MSR_ID(17, "sys_pll_div16"), > + CLK_MSR_ID(18, "sys_cpu_div16"), > + CLK_MSR_ID(19, "hdmitx_sys"), > + CLK_MSR_ID(20, "rtc_osc_out"), > + CLK_MSR_ID(21, "i2s_in_src0"), > + CLK_MSR_ID(22, "eth_phy_ref"), > + CLK_MSR_ID(23, "hdmi_todig"), > + CLK_MSR_ID(26, "sc_int"), > + CLK_MSR_ID(28, "sar_adc"), > + CLK_MSR_ID(31, "mpll_test_out"), > + CLK_MSR_ID(32, "vdec"), > + CLK_MSR_ID(35, "mali"), > + CLK_MSR_ID(36, "hdmi_tx_pixel"), > + CLK_MSR_ID(37, "i958"), > + CLK_MSR_ID(38, "vdin_meas"), > + CLK_MSR_ID(39, "pcm_sclk"), > + CLK_MSR_ID(40, "pcm_mclk"), > + CLK_MSR_ID(41, "eth_rx_or_rmii"), > + CLK_MSR_ID(42, "mp0_out"), > + CLK_MSR_ID(43, "fclk_div5"), > + CLK_MSR_ID(44, "pwm_b"), > + CLK_MSR_ID(45, "pwm_a"), > + CLK_MSR_ID(46, "vpu"), > + CLK_MSR_ID(47, "ddr_dpll_pt"), > + CLK_MSR_ID(48, "mp1_out"), > + CLK_MSR_ID(49, "mp2_out"), > + CLK_MSR_ID(50, "mp3_out"), > + CLK_MSR_ID(51, "nand_core"), > + CLK_MSR_ID(52, "sd_emmc_b"), > + CLK_MSR_ID(53, "sd_emmc_a"), > + CLK_MSR_ID(55, "vid_pll_div_out"), > + CLK_MSR_ID(56, "cci"), > + CLK_MSR_ID(57, "wave420l_c"), > + CLK_MSR_ID(58, "wave420l_b"), > + CLK_MSR_ID(59, "hcodec"), > + CLK_MSR_ID(60, "alt_32k"), > + CLK_MSR_ID(61, "gpio_msr"), > + CLK_MSR_ID(62, "hevc"), > + CLK_MSR_ID(66, "vid_lock"), > + CLK_MSR_ID(70, "pwm_f"), > + CLK_MSR_ID(71, "pwm_e"), > + CLK_MSR_ID(72, "pwm_d"), > + CLK_MSR_ID(73, "pwm_c"), > + CLK_MSR_ID(75, "aoclkx2_int"), > + CLK_MSR_ID(76, "aoclk_int"), > + CLK_MSR_ID(77, "rng_ring_osc_0"), > + CLK_MSR_ID(78, "rng_ring_osc_1"), > + CLK_MSR_ID(79, "rng_ring_osc_2"), > + CLK_MSR_ID(80, "rng_ring_osc_3"), > + CLK_MSR_ID(81, "vapb"), > + CLK_MSR_ID(82, "ge2d"), > +}; > + > +static int meson_gx_measure_id(struct meson_gx_msr_id *clk_msr_id, > + unsigned int divider) I would replace "divider" with duration. Amlogic's kernel code mentions that this is value is in microseconds. during my tests I could confirm that bigger "divider" value means better precision - if this was a divider then lower values should probably give higher precision > +{ > + struct meson_gx_msr *priv = clk_msr_id->priv; > + unsigned int val; > + int ret; > + > + regmap_write(priv->regmap, MSR_CLK_REG0, 0); > + > + /* Set measurement divider */ > + regmap_update_bits(priv->regmap, MSR_CLK_REG0, MSR_CLK_DIV, > + FIELD_PREP(MSR_CLK_DIV, divider - 1)); > + > + /* Set ID */ > + regmap_update_bits(priv->regmap, MSR_CLK_REG0, MSR_CLK_SRC, > + FIELD_PREP(MSR_CLK_SRC, clk_msr_id->id)); > + > + /* Enable & Start */ > + regmap_update_bits(priv->regmap, MSR_CLK_REG0, > + MSR_RUN | MSR_ENABLE, > + MSR_RUN | MSR_ENABLE); > + > + ret = regmap_read_poll_timeout(priv->regmap, MSR_CLK_REG0, > + val, !(val & MSR_BUSY), 10, 10000); > + if (ret) > + return ret; > + > + /* Disable */ > + regmap_update_bits(priv->regmap, MSR_CLK_REG0, MSR_ENABLE, 0); > + > + /* Get the value in multiple of gate time counts */ > + regmap_read(priv->regmap, MSR_CLK_REG2, &val); > + > + if (val >= MSR_VAL_MASK) > + return -EINVAL; > + > + return DIV_ROUND_CLOSEST((val & MSR_VAL_MASK) * 1000000, > + divider); the 32-bit SoCs want a bit of love here: please use DIV_ROUND_CLOSEST_ULL and cast 1MHz to u64 > +} > + > +static int meson_gx_measure_best_id(struct meson_gx_msr_id *clk_msr_id, > + unsigned int *precision) > +{ > + unsigned int divider = DIV_MAX; > + int ret; > + > + /* Start from max divider and down to min divider */ > + do { > + ret = meson_gx_measure_id(clk_msr_id, divider); > + if (ret >= 0) > + *precision = (2 * 1000000) / divider; > + else > + divider -= DIV_STEP; > + } while (divider >= DIV_MIN && ret == -EINVAL); > + > + return ret; > +} > + > +static int clk_msr_show(struct seq_file *s, void *data) > +{ > + struct meson_gx_msr_id *clk_msr_id = s->private; > + unsigned int precision = 0; > + int val; > + > + val = meson_gx_measure_best_id(clk_msr_id, &precision); > + if (val < 0) > + return val; > + > + seq_printf(s, "%d\t+/-%dHz\n", val, precision); > + > + return 0; > +} > +DEFINE_SHOW_ATTRIBUTE(clk_msr); > + > +static int clk_msr_summary_show(struct seq_file *s, void *data) > +{ > + struct meson_gx_msr_id *msr_table = s->private; > + unsigned int precision = 0; > + int val, i; > + > + seq_puts(s, " clock rate precision\n"); > + seq_puts(s, "---------------------------------------------\n"); > + > + for (i = 0 ; i < CLK_MSR_MAX ; ++i) { > + if (!msr_table[i].name) > + continue; > + > + val = meson_gx_measure_best_id(&msr_table[i], &precision); > + if (val < 0) > + return val; > + > + seq_printf(s, " %-20s %10d +/-%dHz\n", > + msr_table[i].name, val, precision); > + } > + > + return 0; > +} > +DEFINE_SHOW_ATTRIBUTE(clk_msr_summary); > + > +static const struct regmap_config clk_msr_regmap_config = { nitpick: meson_clk_msr_regmap_config (for consistency) > + .reg_bits = 32, > + .val_bits = 32, > + .reg_stride = 4, > + .max_register = MSR_CLK_REG2, > +}; > + > +static int meson_gx_msr_probe(struct platform_device *pdev) > +{ > + const struct meson_gx_msr_id *match_data; > + struct meson_gx_msr *priv; > + struct resource *res; > + struct dentry *root, *clks; > + void __iomem *base; > + int i; > + > + priv = devm_kzalloc(&pdev->dev, sizeof(struct meson_gx_msr), > + GFP_KERNEL); > + if (!priv) > + return -ENOMEM; > + > + match_data = device_get_match_data(&pdev->dev); > + if (!match_data) { > + dev_err(&pdev->dev, "failed to get match data\n"); > + return -ENODEV; > + } > + > + memcpy(priv->msr_table, match_data, sizeof(priv->msr_table)); > + > + res = platform_get_resource(pdev, IORESOURCE_MEM, 0); > + base = devm_ioremap_resource(&pdev->dev, res); > + if (IS_ERR(base)) { > + dev_err(&pdev->dev, "io resource mapping failed\n"); > + return PTR_ERR(base); > + } > + > + priv->regmap = devm_regmap_init_mmio(&pdev->dev, base, > + &clk_msr_regmap_config); > + if (IS_ERR(priv->regmap)) > + return PTR_ERR(priv->regmap); > + > + root = debugfs_create_dir("meson-clk-msr", NULL); > + clks = debugfs_create_dir("clks", root); > + > + debugfs_create_file("measure_summary", 0444, root, > + priv->msr_table, &clk_msr_summary_fops); > + > + for (i = 0 ; i < CLK_MSR_MAX ; ++i) { > + if (!priv->msr_table[i].name) > + continue; > + > + priv->msr_table[i].priv = priv; > + > + debugfs_create_file(priv->msr_table[i].name, 0444, clks, > + &priv->msr_table[i], &clk_msr_fops); > + } > + > + return 0; > +} > + > +static const struct of_device_id meson_gx_msr_match_table[] = { > + { > + .compatible = "amlogic,meson-gx-clk-measure", > + .data = (void *)clk_msr_gx, > + }, if you want you can fold this with the patch that I've attached, then we have Meson8 and Meson8b support as well :) > + { /* sentinel */ } > +}; > + > +static struct platform_driver meson_gx_msr_driver = { > + .probe = meson_gx_msr_probe, > + .driver = { > + .name = "meson_gx_msr", > + .of_match_table = meson_gx_msr_match_table, > + }, > +}; > +builtin_platform_driver(meson_gx_msr_driver); > -- > 2.19.1 > > > _______________________________________________ > linux-amlogic mailing list > linux-amlogic@lists.infradead.org > http://lists.infradead.org/mailman/listinfo/linux-amlogic --00000000000020b390057ae24eee Content-Type: text/x-patch; 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