From patchwork Wed Nov 2 08:36:01 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Billy Tsai X-Patchwork-Id: 13027929 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id 40EFCC4332F for ; Wed, 2 Nov 2022 09:30:32 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20210309; h=Sender: Content-Transfer-Encoding:Content-Type:List-Subscribe:List-Help:List-Post: List-Archive:List-Unsubscribe:List-Id:MIME-Version:References:In-Reply-To: Message-ID:Date:Subject:CC:To:From:Reply-To:Content-ID:Content-Description: Resent-Date:Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID: List-Owner; bh=htzHQ9YxuRpep83PwUQrNMYeyI20JXkVzf9oAE40ajE=; b=DhWDYjFh5qjzke SZImL1uGPuOUsYDXJzfI7YZTp81Bbyvoc1+x0LDHN6Fqt9GvIWhEaErqiNjEZpYxSIaVtp3HQJvn+ PrFSbGOD+yQF2A3rahOAfPm37voXUSU1vl1C6c2nRWh6rfFa13TaC8HFybUjfiRgU/QhRHOswD2Jj is/F3tjhPBRgmtU7mBQ8LI+1JVuw/cuDgPkwxMWRL53TsYNlJlJiSbLieLSOYGz4JPbvQZSb2Bboy uhP5K5w9Z16rXeUIIxXSNCf2yGNdHAhuXvNBE+oDPBrECgxsRMZXJcIIyZ1PQynxdj+w2ph3IA3Xp l9L4c4HDyGZlfq+/Bopw==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.94.2 #2 (Red Hat Linux)) id 1oqA3P-00AFNU-JE; Wed, 02 Nov 2022 09:28:59 +0000 Received: from desiato.infradead.org ([2001:8b0:10b:1:d65d:64ff:fe57:4e05]) by bombadil.infradead.org with esmtps (Exim 4.94.2 #2 (Red Hat Linux)) id 1oqA3N-00AFMs-3k for linux-arm-kernel@bombadil.infradead.org; Wed, 02 Nov 2022 09:28:57 +0000 DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=infradead.org; s=desiato.20200630; h=Content-Type:Content-Transfer-Encoding :MIME-Version:References:In-Reply-To:Message-ID:Date:Subject:CC:To:From: Sender:Reply-To:Content-ID:Content-Description; bh=z4GLFC7JWa8swqMDDiSUA6e+dAfMXEQi6g0IzFlACf4=; b=R4VfM0V/7kvCfmHGRwkNEN7fjB uzmWib6LdRjPx0u6BIvWZTnrfBrnASH+9OlzgCdp1VdE2Vjs6XDdAuP4tl2DTQBnfEOO9d23G331x Nm4Rg5cL8m3wAlii+/2gwFAmBeFI161LdCsuuHdBs/SbC8B3Y2i8e16RIQE+cBR4NUfADHtvxKLoj 5U2GFYahGXWmopYCMibeOk9poeiRsDhi9L9a4zHs6OaYj4r0EK8XVUhrlqcawtGFafjSQrq2GA+kv kN8Vez27MD2TumlGBQr9yybHLxwv9xS3jABo5kQ374UPdHB9zTKimNNs/wn5on0EIA7QNDAZZxiKt tKeE6CIQ==; Received: from twspam01.aspeedtech.com ([211.20.114.71]) by desiato.infradead.org with esmtps (Exim 4.94.2 #2 (Red Hat Linux)) id 1oq9Db-008LT2-3y for linux-arm-kernel@lists.infradead.org; Wed, 02 Nov 2022 08:35:30 +0000 Received: from mail.aspeedtech.com ([192.168.0.24]) by twspam01.aspeedtech.com with ESMTP id 2A28BAHw072663; Wed, 2 Nov 2022 16:11:11 +0800 (GMT-8) (envelope-from billy_tsai@aspeedtech.com) Received: from BillyTsai-pc.aspeed.com (192.168.2.149) by TWMBX02.aspeed.com (192.168.0.24) with Microsoft SMTP Server (TLS) id 15.0.1497.2; Wed, 2 Nov 2022 16:34:24 +0800 From: Billy Tsai To: , , , , , , , , , , , , , , , , , CC: kernel test robot Subject: [v3 3/3] hwmon: Add Aspeed ast2600 TACH support Date: Wed, 2 Nov 2022 16:36:01 +0800 Message-ID: <20221102083601.10456-4-billy_tsai@aspeedtech.com> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20221102083601.10456-1-billy_tsai@aspeedtech.com> References: <20221102083601.10456-1-billy_tsai@aspeedtech.com> MIME-Version: 1.0 X-Originating-IP: [192.168.2.149] X-ClientProxiedBy: TWMBX02.aspeed.com (192.168.0.24) To TWMBX02.aspeed.com (192.168.0.24) X-DNSRBL: X-MAIL: twspam01.aspeedtech.com 2A28BAHw072663 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20221102_083528_593426_83DC79CC X-CRM114-Status: GOOD ( 25.93 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org This patch add the support of Tachometer which can use to monitor the frequency of the input. The tach supports up to 16 channels and it's part function of multi-function device "pwm-tach controller". Signed-off-by: Billy Tsai Reported-by: kernel test robot --- Documentation/hwmon/index.rst | 1 + Documentation/hwmon/tach-aspeed-ast2600.rst | 28 ++ drivers/hwmon/Kconfig | 9 + drivers/hwmon/Makefile | 1 + drivers/hwmon/tach-aspeed-ast2600.c | 476 ++++++++++++++++++++ 5 files changed, 515 insertions(+) create mode 100644 Documentation/hwmon/tach-aspeed-ast2600.rst create mode 100644 drivers/hwmon/tach-aspeed-ast2600.c diff --git a/Documentation/hwmon/index.rst b/Documentation/hwmon/index.rst index f790f1260c33..c4c0559fd4fa 100644 --- a/Documentation/hwmon/index.rst +++ b/Documentation/hwmon/index.rst @@ -179,6 +179,7 @@ Hardware Monitoring Kernel Drivers smsc47m1 sparx5-temp stpddc60 + tach-aspeed-ast2600 tc654 tc74 thmc50 diff --git a/Documentation/hwmon/tach-aspeed-ast2600.rst b/Documentation/hwmon/tach-aspeed-ast2600.rst new file mode 100644 index 000000000000..8967f60672dc --- /dev/null +++ b/Documentation/hwmon/tach-aspeed-ast2600.rst @@ -0,0 +1,28 @@ +Kernel driver tach-aspeed-ast2600 +============================== + +Supported chips: + ASPEED AST2600 + +Authors: + + +Description: +------------ +This driver implements support for ASPEED AST2600 Fan Tacho controller. +The controller supports up to 16 tachometer inputs. + +The driver provides the following sensor accesses in sysfs: +=============== ======= ===================================================== +fanX_input ro provide current fan rotation value in RPM as reported + by the fan to the device. +fanX_div rw Fan divisor: Supported value are power of 4 (1, 4, 16 + 64, ... 4194304) + The larger divisor, the less rpm accuracy and the less + affected by fan signal glitch. +fanX_min rw Fan minimum RPM which can used to change the timeout + value for controller polling the result. +fanX_max rw Fan maximum RPM which can used to change the polling + period of the driver. +fanX_pulses rw Fan pulses per resolution. +=============== ======= ====================================================== diff --git a/drivers/hwmon/Kconfig b/drivers/hwmon/Kconfig index fa2356398744..a84c15b73aa6 100644 --- a/drivers/hwmon/Kconfig +++ b/drivers/hwmon/Kconfig @@ -397,6 +397,15 @@ config SENSORS_ASPEED This driver can also be built as a module. If so, the module will be called aspeed_pwm_tacho. +config SENSORS_TACH_ASPEED_AST2600 + tristate "ASPEED ast2600 Tachometer support" + select REGMAP + help + This driver provides support for Aspeed ast2600 Tachometer. + + To compile this driver as a module, choose M here: the module + will be called tach-aspeed-ast2600. + config SENSORS_ATXP1 tristate "Attansic ATXP1 VID controller" depends on I2C diff --git a/drivers/hwmon/Makefile b/drivers/hwmon/Makefile index d2497b2644e6..7e2d708e93b8 100644 --- a/drivers/hwmon/Makefile +++ b/drivers/hwmon/Makefile @@ -51,6 +51,7 @@ obj-$(CONFIG_SENSORS_ARM_SCMI) += scmi-hwmon.o obj-$(CONFIG_SENSORS_ARM_SCPI) += scpi-hwmon.o obj-$(CONFIG_SENSORS_AS370) += as370-hwmon.o obj-$(CONFIG_SENSORS_ASC7621) += asc7621.o +obj-$(CONFIG_SENSORS_TACH_ASPEED_AST2600) += tach-aspeed-ast2600.o obj-$(CONFIG_SENSORS_ASPEED) += aspeed-pwm-tacho.o obj-$(CONFIG_SENSORS_ATXP1) += atxp1.o obj-$(CONFIG_SENSORS_AXI_FAN_CONTROL) += axi-fan-control.o diff --git a/drivers/hwmon/tach-aspeed-ast2600.c b/drivers/hwmon/tach-aspeed-ast2600.c new file mode 100644 index 000000000000..c10e6bc3c035 --- /dev/null +++ b/drivers/hwmon/tach-aspeed-ast2600.c @@ -0,0 +1,476 @@ +// SPDX-License-Identifier: GPL-2.0-or-later +/* + * Copyright (C) ASPEED Technology Inc. + */ + +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include + +/* The channel number of Aspeed tach controller */ +#define TACH_ASPEED_NR_TACHS 16 +/* TACH Control Register */ +#define TACH_ASPEED_CTRL(ch) (((ch) * 0x10) + 0x08) +#define TACH_ASPEED_IER BIT(31) +#define TACH_ASPEED_INVERS_LIMIT BIT(30) +#define TACH_ASPEED_LOOPBACK BIT(29) +#define TACH_ASPEED_ENABLE BIT(28) +#define TACH_ASPEED_DEBOUNCE_MASK GENMASK(27, 26) +#define TACH_ASPEED_DEBOUNCE_BIT 26 +#define TACH_ASPEED_IO_EDGE_MASK GENMASK(25, 24) +#define TACH_ASPEED_IO_EDGE_BIT 24 +#define TACH_ASPEED_CLK_DIV_T_MASK GENMASK(23, 20) +#define TACH_ASPEED_CLK_DIV_BIT 20 +#define TACH_ASPEED_THRESHOLD_MASK GENMASK(19, 0) +/* [27:26] */ +#define DEBOUNCE_3_CLK 0x00 +#define DEBOUNCE_2_CLK 0x01 +#define DEBOUNCE_1_CLK 0x02 +#define DEBOUNCE_0_CLK 0x03 +/* [25:24] */ +#define F2F_EDGES 0x00 +#define R2R_EDGES 0x01 +#define BOTH_EDGES 0x02 +/* [23:20] */ +/* divisor = 4 to the nth power, n = register value */ +#define DEFAULT_TACH_DIV 1024 +#define DIV_TO_REG(divisor) (ilog2(divisor) >> 1) + +/* TACH Status Register */ +#define TACH_ASPEED_STS(ch) (((ch) * 0x10) + 0x0C) + +/*PWM_TACH_STS */ +#define TACH_ASPEED_ISR BIT(31) +#define TACH_ASPEED_PWM_OUT BIT(25) +#define TACH_ASPEED_PWM_OEN BIT(24) +#define TACH_ASPEED_DEB_INPUT BIT(23) +#define TACH_ASPEED_RAW_INPUT BIT(22) +#define TACH_ASPEED_VALUE_UPDATE BIT(21) +#define TACH_ASPEED_FULL_MEASUREMENT BIT(20) +#define TACH_ASPEED_VALUE_MASK GENMASK(19, 0) +/********************************************************** + * Software setting + *********************************************************/ +#define DEFAULT_FAN_MIN_RPM 1000 +#define DEFAULT_FAN_PULSE_PR 2 +/* + * Add this value to avoid CPU consuming a lot of resources in waiting rpm + * updating. Assume the max rpm of fan is 60000, the fastest period of updating + * tach value will be equal to (1000000 * 2 * 60) / (2 * max_rpm) = 1000us. + */ +#define DEFAULT_FAN_MAX_RPM 60000 + +struct aspeed_tach_channel_params { + int limited_inverse; + u16 threshold; + u8 tach_edge; + u8 tach_debounce; + u8 pulse_pr; + u32 min_rpm; + u32 max_rpm; + u32 divisor; + u32 sample_period; /* unit is us */ + u32 polling_period; /* unit is us */ +}; + +struct aspeed_tach_data { + struct device *dev; + struct regmap *regmap; + struct clk *clk; + struct reset_control *reset; + bool tach_present[TACH_ASPEED_NR_TACHS]; + struct aspeed_tach_channel_params *tach_channel; +}; + +static void aspeed_update_tach_sample_period(struct aspeed_tach_data *priv, + u8 fan_tach_ch) +{ + u32 tach_period_us; + u8 pulse_pr = priv->tach_channel[fan_tach_ch].pulse_pr; + u32 min_rpm = priv->tach_channel[fan_tach_ch].min_rpm; + + /* + * min(Tach input clock) = (PulsePR * minRPM) / 60 + * max(Tach input period) = 60 / (PulsePR * minRPM) + * Tach sample period > 2 * max(Tach input period) = (2*60) / (PulsePR * minRPM) + */ + tach_period_us = (USEC_PER_SEC * 2 * 60) / (pulse_pr * min_rpm); + /* Add the margin (about 1.5) of tach sample period to avoid sample miss */ + tach_period_us = (tach_period_us * 1500) >> 10; + dev_dbg(priv->dev, "tach%d sample period = %dus", fan_tach_ch, tach_period_us); + priv->tach_channel[fan_tach_ch].sample_period = tach_period_us; +} + +static void aspeed_update_tach_polling_period(struct aspeed_tach_data *priv, + u8 fan_tach_ch) +{ + u32 tach_period_us; + u8 pulse_pr = priv->tach_channel[fan_tach_ch].pulse_pr; + u32 max_rpm = priv->tach_channel[fan_tach_ch].max_rpm; + + tach_period_us = (USEC_PER_SEC * 2 * 60) / (pulse_pr * max_rpm); + dev_dbg(priv->dev, "tach%d polling period = %dus", fan_tach_ch, tach_period_us); + priv->tach_channel[fan_tach_ch].polling_period = tach_period_us; +} + +static void aspeed_tach_ch_enable(struct aspeed_tach_data *priv, u8 tach_ch, + bool enable) +{ + if (enable) + regmap_set_bits(priv->regmap, TACH_ASPEED_CTRL(tach_ch), + TACH_ASPEED_ENABLE); + else + regmap_clear_bits(priv->regmap, TACH_ASPEED_CTRL(tach_ch), + TACH_ASPEED_ENABLE); +} + +static int aspeed_get_fan_tach_ch_rpm(struct aspeed_tach_data *priv, + u8 fan_tach_ch) +{ + u32 raw_data, tach_div, val; + unsigned long clk_source; + u64 rpm; + int ret; + + ret = regmap_read_poll_timeout(priv->regmap, TACH_ASPEED_STS(fan_tach_ch), val, + (val & TACH_ASPEED_FULL_MEASUREMENT) && + (val & TACH_ASPEED_VALUE_UPDATE), + priv->tach_channel[fan_tach_ch].polling_period, + priv->tach_channel[fan_tach_ch].sample_period); + + if (ret) { + /* return 0 if we didn't get an answer because of timeout */ + if (ret == -ETIMEDOUT) + return 0; + return ret; + } + + raw_data = val & TACH_ASPEED_VALUE_MASK; + /* + * We need the mode to determine if the raw_data is double (from + * counting both edges). + */ + if (priv->tach_channel[fan_tach_ch].tach_edge == BOTH_EDGES) + raw_data <<= 1; + + tach_div = raw_data * (priv->tach_channel[fan_tach_ch].divisor) * + (priv->tach_channel[fan_tach_ch].pulse_pr); + + clk_source = clk_get_rate(priv->clk); + dev_dbg(priv->dev, "clk %ld, raw_data %d , tach_div %d\n", clk_source, + raw_data, tach_div); + + if (tach_div == 0) + return -EDOM; + + rpm = (u64)clk_source * 60; + do_div(rpm, tach_div); + + return rpm; +} + +static int aspeed_tach_hwmon_read(struct device *dev, + enum hwmon_sensor_types type, u32 attr, + int channel, long *val) +{ + struct aspeed_tach_data *priv = dev_get_drvdata(dev); + u32 reg_val; + int ret; + + switch (attr) { + case hwmon_fan_input: + ret = aspeed_get_fan_tach_ch_rpm(priv, channel); + if (ret < 0) + return ret; + *val = ret; + break; + case hwmon_fan_min: + *val = priv->tach_channel[channel].min_rpm; + break; + case hwmon_fan_max: + *val = priv->tach_channel[channel].max_rpm; + break; + case hwmon_fan_div: + regmap_read(priv->regmap, TACH_ASPEED_CTRL(channel), ®_val); + reg_val = FIELD_GET(TACH_ASPEED_CLK_DIV_T_MASK, reg_val); + *val = BIT(reg_val << 1); + break; + case hwmon_fan_pulses: + *val = priv->tach_channel[channel].pulse_pr; + break; + default: + return -EOPNOTSUPP; + } + return 0; +} + +static int aspeed_tach_hwmon_write(struct device *dev, + enum hwmon_sensor_types type, u32 attr, + int channel, long val) +{ + struct aspeed_tach_data *priv = dev_get_drvdata(dev); + + switch (attr) { + case hwmon_fan_min: + priv->tach_channel[channel].min_rpm = val; + aspeed_update_tach_sample_period(priv, channel); + break; + case hwmon_fan_max: + priv->tach_channel[channel].max_rpm = val; + aspeed_update_tach_polling_period(priv, channel); + break; + case hwmon_fan_div: + if (!(is_power_of_2(val) && !(ilog2(val) % 2))) { + dev_err(dev, + "fan_div value %ld not supported. Only support power of 4\n", + val); + return -EINVAL; + } + priv->tach_channel[channel].divisor = val; + regmap_write_bits(priv->regmap, TACH_ASPEED_CTRL(channel), + TACH_ASPEED_CLK_DIV_T_MASK, + DIV_TO_REG(priv->tach_channel[channel].divisor) + << TACH_ASPEED_CLK_DIV_BIT); + break; + case hwmon_fan_pulses: + priv->tach_channel[channel].pulse_pr = val; + aspeed_update_tach_sample_period(priv, channel); + break; + default: + return -EOPNOTSUPP; + } + + return 0; +} + +static umode_t aspeed_tach_dev_is_visible(const void *drvdata, + enum hwmon_sensor_types type, + u32 attr, int channel) +{ + const struct aspeed_tach_data *priv = drvdata; + + if (!priv->tach_present[channel]) + return 0; + switch (attr) { + case hwmon_fan_input: + return 0444; + case hwmon_fan_min: + case hwmon_fan_max: + case hwmon_fan_div: + case hwmon_fan_pulses: + return 0644; + } + return 0; +} + +static const struct hwmon_ops aspeed_tach_ops = { + .is_visible = aspeed_tach_dev_is_visible, + .read = aspeed_tach_hwmon_read, + .write = aspeed_tach_hwmon_write, +}; + +static const struct hwmon_channel_info *aspeed_tach_info[] = { + HWMON_CHANNEL_INFO(fan, + HWMON_F_INPUT | HWMON_F_MIN | HWMON_F_MAX | + HWMON_F_DIV | HWMON_F_PULSES, + HWMON_F_INPUT | HWMON_F_MIN | HWMON_F_MAX | + HWMON_F_DIV | HWMON_F_PULSES, + HWMON_F_INPUT | HWMON_F_MIN | HWMON_F_MAX | + HWMON_F_DIV | HWMON_F_PULSES, + HWMON_F_INPUT | HWMON_F_MIN | HWMON_F_MAX | + HWMON_F_DIV | HWMON_F_PULSES, + HWMON_F_INPUT | HWMON_F_MIN | HWMON_F_MAX | + HWMON_F_DIV | HWMON_F_PULSES, + HWMON_F_INPUT | HWMON_F_MIN | HWMON_F_MAX | + HWMON_F_DIV | HWMON_F_PULSES, + HWMON_F_INPUT | HWMON_F_MIN | HWMON_F_MAX | + HWMON_F_DIV | HWMON_F_PULSES, + HWMON_F_INPUT | HWMON_F_MIN | HWMON_F_MAX | + HWMON_F_DIV | HWMON_F_PULSES, + HWMON_F_INPUT | HWMON_F_MIN | HWMON_F_MAX | + HWMON_F_DIV | HWMON_F_PULSES, + HWMON_F_INPUT | HWMON_F_MIN | HWMON_F_MAX | + HWMON_F_DIV | HWMON_F_PULSES, + HWMON_F_INPUT | HWMON_F_MIN | HWMON_F_MAX | + HWMON_F_DIV | HWMON_F_PULSES, + HWMON_F_INPUT | HWMON_F_MIN | HWMON_F_MAX | + HWMON_F_DIV | HWMON_F_PULSES, + HWMON_F_INPUT | HWMON_F_MIN | HWMON_F_MAX | + HWMON_F_DIV | HWMON_F_PULSES, + HWMON_F_INPUT | HWMON_F_MIN | HWMON_F_MAX | + HWMON_F_DIV | HWMON_F_PULSES, + HWMON_F_INPUT | HWMON_F_MIN | HWMON_F_MAX | + HWMON_F_DIV | HWMON_F_PULSES, + HWMON_F_INPUT | HWMON_F_MIN | HWMON_F_MAX | + HWMON_F_DIV | HWMON_F_PULSES), + NULL +}; + +static const struct hwmon_chip_info aspeed_tach_chip_info = { + .ops = &aspeed_tach_ops, + .info = aspeed_tach_info, +}; + +static void aspeed_create_fan_tach_channel(struct aspeed_tach_data *priv, + u32 tach_ch) +{ + priv->tach_present[tach_ch] = true; + priv->tach_channel[tach_ch].limited_inverse = 0; + regmap_write_bits(priv->regmap, TACH_ASPEED_CTRL(tach_ch), + TACH_ASPEED_INVERS_LIMIT, + priv->tach_channel[tach_ch].limited_inverse ? + TACH_ASPEED_INVERS_LIMIT : + 0); + + priv->tach_channel[tach_ch].tach_debounce = DEBOUNCE_3_CLK; + regmap_write_bits(priv->regmap, TACH_ASPEED_CTRL(tach_ch), + TACH_ASPEED_DEBOUNCE_MASK, + priv->tach_channel[tach_ch].tach_debounce + << TACH_ASPEED_DEBOUNCE_BIT); + + priv->tach_channel[tach_ch].tach_edge = F2F_EDGES; + regmap_write_bits(priv->regmap, TACH_ASPEED_CTRL(tach_ch), + TACH_ASPEED_IO_EDGE_MASK, + priv->tach_channel[tach_ch].tach_edge + << TACH_ASPEED_IO_EDGE_BIT); + + priv->tach_channel[tach_ch].divisor = DEFAULT_TACH_DIV; + regmap_write_bits(priv->regmap, TACH_ASPEED_CTRL(tach_ch), + TACH_ASPEED_CLK_DIV_T_MASK, + DIV_TO_REG(priv->tach_channel[tach_ch].divisor) + << TACH_ASPEED_CLK_DIV_BIT); + + priv->tach_channel[tach_ch].threshold = 0; + regmap_write_bits(priv->regmap, TACH_ASPEED_CTRL(tach_ch), + TACH_ASPEED_THRESHOLD_MASK, + priv->tach_channel[tach_ch].threshold); + + priv->tach_channel[tach_ch].pulse_pr = DEFAULT_FAN_PULSE_PR; + priv->tach_channel[tach_ch].min_rpm = DEFAULT_FAN_MIN_RPM; + aspeed_update_tach_sample_period(priv, tach_ch); + + priv->tach_channel[tach_ch].max_rpm = DEFAULT_FAN_MAX_RPM; + aspeed_update_tach_polling_period(priv, tach_ch); + + aspeed_tach_ch_enable(priv, tach_ch, true); +} + +static int aspeed_tach_create_fan(struct device *dev, struct device_node *child, + struct aspeed_tach_data *priv) +{ + u32 tach_channel; + int ret; + + ret = of_property_read_u32(child, "reg", &tach_channel); + if (ret) + return ret; + + aspeed_create_fan_tach_channel(priv, tach_channel); + + return 0; +} + +static void aspeed_tach_reset_assert(void *data) +{ + struct reset_control *rst = data; + + reset_control_assert(rst); +} + +static int aspeed_tach_probe(struct platform_device *pdev) +{ + struct device *dev = &pdev->dev; + struct device_node *np, *child; + struct aspeed_tach_data *priv; + struct device *hwmon; + struct platform_device *parent_dev; + int ret; + + np = dev->parent->of_node; + if (!of_device_is_compatible(np, "aspeed,ast2600-pwm-tach")) + return dev_err_probe(dev, -ENODEV, + "Unsupported tach device binding\n"); + + priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL); + if (!priv) + return -ENOMEM; + priv->dev = &pdev->dev; + priv->tach_channel = + devm_kcalloc(dev, TACH_ASPEED_NR_TACHS, + sizeof(*priv->tach_channel), GFP_KERNEL); + + priv->regmap = syscon_node_to_regmap(np); + if (IS_ERR(priv->regmap)) + return dev_err_probe(dev, PTR_ERR(priv->regmap), + "Couldn't get regmap\n"); + parent_dev = of_find_device_by_node(np); + priv->clk = devm_clk_get_enabled(&parent_dev->dev, NULL); + if (IS_ERR(priv->clk)) + return dev_err_probe(dev, PTR_ERR(priv->clk), + "Couldn't get clock\n"); + + priv->reset = devm_reset_control_get_shared(&parent_dev->dev, NULL); + if (IS_ERR(priv->reset)) + return dev_err_probe(dev, PTR_ERR(priv->reset), + "Couldn't get reset control\n"); + + ret = reset_control_deassert(priv->reset); + if (ret) + return dev_err_probe(dev, ret, + "Couldn't deassert reset control\n"); + + ret = devm_add_action_or_reset(dev, aspeed_tach_reset_assert, + priv->reset); + if (ret) + return ret; + + for_each_child_of_node(dev->of_node, child) { + ret = aspeed_tach_create_fan(dev, child, priv); + if (ret) { + of_node_put(child); + return ret; + } + } + + hwmon = devm_hwmon_device_register_with_info(dev, "aspeed_tach", priv, + &aspeed_tach_chip_info, NULL); + ret = PTR_ERR_OR_ZERO(hwmon); + if (ret) + return dev_err_probe(dev, ret, + "Failed to register hwmon device\n"); + return 0; +} + +static const struct of_device_id of_stach_match_table[] = { + { + .compatible = "aspeed,ast2600-tach", + }, + {}, +}; +MODULE_DEVICE_TABLE(of, of_stach_match_table); + +static struct platform_driver aspeed_tach_driver = { + .probe = aspeed_tach_probe, + .driver = { + .name = "aspeed_tach", + .of_match_table = of_stach_match_table, + }, +}; + +module_platform_driver(aspeed_tach_driver); + +MODULE_AUTHOR("Billy Tsai "); +MODULE_DESCRIPTION("Aspeed ast2600 TACH device driver"); +MODULE_LICENSE("GPL v2"); +