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=-9.0 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_PATCH,MAILING_LIST_MULTI,SIGNED_OFF_BY,SPF_PASS,URIBL_BLOCKED, 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 316BFC282CF for ; Mon, 28 Jan 2019 13:02:32 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 00CB22171F for ; Mon, 28 Jan 2019 13:02:32 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726887AbfA1NCb (ORCPT ); Mon, 28 Jan 2019 08:02:31 -0500 Received: from relay5-d.mail.gandi.net ([217.70.183.197]:45525 "EHLO relay5-d.mail.gandi.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726611AbfA1NCa (ORCPT ); Mon, 28 Jan 2019 08:02:30 -0500 X-Originating-IP: 91.192.165.7 Received: from pc.localdomain (unknown [91.192.165.7]) (Authenticated sender: contact@artur-rojek.eu) by relay5-d.mail.gandi.net (Postfix) with ESMTPSA id 9B8AC1C0004; Mon, 28 Jan 2019 13:02:25 +0000 (UTC) From: Artur Rojek To: Jonathan Cameron , Rob Herring , Mark Rutland Cc: linux-iio@vger.kernel.org, devicetree@vger.kernel.org, linux-kernel@vger.kernel.org, Paul Cercueil , Artur Rojek Subject: [PATCH 3/3] IIO: add Ingenic JZ47xx ADC driver. Date: Mon, 28 Jan 2019 14:02:41 +0100 Message-Id: <20190128130241.5027-3-contact@artur-rojek.eu> X-Mailer: git-send-email 2.20.1 In-Reply-To: <20190128130241.5027-1-contact@artur-rojek.eu> References: <20190128130241.5027-1-contact@artur-rojek.eu> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Add an IIO driver for the ADC hardware present on Ingenic JZ47xx SoCs. Signed-off-by: Artur Rojek --- drivers/iio/adc/Kconfig | 9 + drivers/iio/adc/Makefile | 1 + drivers/iio/adc/ingenic-adc.c | 357 ++++++++++++++++++++++++++++++++++ 3 files changed, 367 insertions(+) create mode 100644 drivers/iio/adc/ingenic-adc.c diff --git a/drivers/iio/adc/Kconfig b/drivers/iio/adc/Kconfig index 7a3ca4ec0cb7..f9f349a22b04 100644 --- a/drivers/iio/adc/Kconfig +++ b/drivers/iio/adc/Kconfig @@ -367,6 +367,15 @@ config INA2XX_ADC Say yes here to build support for TI INA2xx family of Power Monitors. This driver is mutually exclusive with the HWMON version. +config INGENIC_ADC + tristate "Ingenic JZ47xx SoCs ADC driver" + depends on MIPS || COMPILE_TEST + help + Say yes here to build support for the Ingenic JZ47xx SoCs ADC unit. + + This driver can also be built as a module. If so, the module will be + called ingenic_adc. + config IMX7D_ADC tristate "Freescale IMX7D ADC driver" depends on ARCH_MXC || COMPILE_TEST diff --git a/drivers/iio/adc/Makefile b/drivers/iio/adc/Makefile index 07df37f621bd..0a7acab33b91 100644 --- a/drivers/iio/adc/Makefile +++ b/drivers/iio/adc/Makefile @@ -36,6 +36,7 @@ obj-$(CONFIG_HI8435) += hi8435.o obj-$(CONFIG_HX711) += hx711.o obj-$(CONFIG_IMX7D_ADC) += imx7d_adc.o obj-$(CONFIG_INA2XX_ADC) += ina2xx-adc.o +obj-$(CONFIG_INGENIC_ADC) += ingenic-adc.o obj-$(CONFIG_LP8788_ADC) += lp8788_adc.o obj-$(CONFIG_LPC18XX_ADC) += lpc18xx_adc.o obj-$(CONFIG_LPC32XX_ADC) += lpc32xx_adc.o diff --git a/drivers/iio/adc/ingenic-adc.c b/drivers/iio/adc/ingenic-adc.c new file mode 100644 index 000000000000..4235d46a3d37 --- /dev/null +++ b/drivers/iio/adc/ingenic-adc.c @@ -0,0 +1,357 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * ADC driver for the Ingenic JZ47xx SoCs + * Copyright (c) 2019 Artur Rojek + * + * based on drivers/mfd/jz4740-adc.c + */ + +#include +#include +#include +#include +#include +#include +#include +#include + +#define JZ_ADC_REG_ENABLE 0x00 +#define JZ_ADC_REG_CFG 0x04 +#define JZ_ADC_REG_CTRL 0x08 +#define JZ_ADC_REG_STATUS 0x0c +#define JZ_ADC_REG_ADTCH 0x18 +#define JZ_ADC_REG_ADBDAT 0x1c +#define JZ_ADC_REG_ADSDAT 0x20 + +#define REG_CFG_BAT_MD BIT(4) + +#define AUX_VREF 3300 +#define AUX_VREF_BITS 12 +#define BATTERY_LOW_VREF 2500 +#define BATTERY_LOW_VREF_BITS 12 +#define JZ4725B_BATTERY_HIGH_VREF 7500 +#define JZ4725B_BATTERY_HIGH_VREF_BITS 10 +#define JZ4740_BATTERY_HIGH_VREF (7500 * 0.986) +#define JZ4740_BATTERY_HIGH_VREF_BITS 12 + +struct ingenic_adc_soc_data { + unsigned int battery_high_vref; + unsigned int battery_high_vref_bits; + const int *battery_raw_avail; + size_t battery_raw_avail_size; + const int *battery_scale_avail; + size_t battery_scale_avail_size; +}; + +struct ingenic_adc { + void __iomem *base; + struct clk *clk; + spinlock_t lock; + const struct ingenic_adc_soc_data *soc_data; + bool low_vref_mode; +}; + +static void ingenic_adc_set_config(struct ingenic_adc *adc, + uint32_t mask, + uint32_t val) +{ + unsigned long flags; + uint32_t cfg; + + clk_enable(adc->clk); + spin_lock_irqsave(&adc->lock, flags); + + cfg = readl(adc->base + JZ_ADC_REG_CFG) & ~mask; + cfg |= val; + writel(cfg, adc->base + JZ_ADC_REG_CFG); + + spin_unlock_irqrestore(&adc->lock, flags); + clk_disable(adc->clk); +} + +static void ingenic_adc_enable(struct ingenic_adc *adc, + int engine, + bool enabled) +{ + unsigned long flags; + u8 val; + + spin_lock_irqsave(&adc->lock, flags); + val = readb(adc->base + JZ_ADC_REG_ENABLE); + + if (enabled) + val |= BIT(engine); + else + val &= ~BIT(engine); + + writeb(val, adc->base + JZ_ADC_REG_ENABLE); + spin_unlock_irqrestore(&adc->lock, flags); +} + +static int ingenic_adc_capture(struct ingenic_adc *adc, + int engine) +{ + u8 val; + int ret; + + ingenic_adc_enable(adc, engine, true); + ret = readb_poll_timeout(adc->base + JZ_ADC_REG_ENABLE, val, + !(val & BIT(engine)), 250, 1000); + if (ret) + ingenic_adc_enable(adc, engine, false); + + return ret; +} + +static int ingenic_adc_write_raw(struct iio_dev *iio_dev, + struct iio_chan_spec const *chan, + int val, + int val2, + long m) +{ + struct ingenic_adc *adc = iio_priv(iio_dev); + + switch (m) { + case IIO_CHAN_INFO_SCALE: + switch (chan->channel) { + case INGENIC_ADC_BATTERY: + if (val > BATTERY_LOW_VREF) { + ingenic_adc_set_config(adc, + REG_CFG_BAT_MD, + 0); + adc->low_vref_mode = false; + } else { + ingenic_adc_set_config(adc, + REG_CFG_BAT_MD, + REG_CFG_BAT_MD); + adc->low_vref_mode = true; + } + return 0; + default: + return -EINVAL; + } + default: + return -EINVAL; + } +} + +static const int jz4725b_adc_battery_raw_avail[] = { + 0, 1, (1 << BATTERY_LOW_VREF_BITS) - 1, +}; + +static const int jz4725b_adc_battery_scale_avail[] = { + JZ4725B_BATTERY_HIGH_VREF, JZ4725B_BATTERY_HIGH_VREF_BITS, + BATTERY_LOW_VREF, BATTERY_LOW_VREF_BITS, +}; + +static const int jz4740_adc_battery_raw_avail[] = { + 0, 1, (1 << BATTERY_LOW_VREF_BITS) - 1, +}; + +static const int jz4740_adc_battery_scale_avail[] = { + JZ4740_BATTERY_HIGH_VREF, JZ4740_BATTERY_HIGH_VREF_BITS, + BATTERY_LOW_VREF, BATTERY_LOW_VREF_BITS, +}; + +static const struct ingenic_adc_soc_data jz4725b_adc_soc_data = { + .battery_high_vref = JZ4725B_BATTERY_HIGH_VREF, + .battery_high_vref_bits = JZ4725B_BATTERY_HIGH_VREF_BITS, + .battery_raw_avail = jz4725b_adc_battery_raw_avail, + .battery_raw_avail_size = ARRAY_SIZE(jz4725b_adc_battery_raw_avail), + .battery_scale_avail = jz4725b_adc_battery_scale_avail, + .battery_scale_avail_size = ARRAY_SIZE(jz4725b_adc_battery_scale_avail), +}; + +static const struct ingenic_adc_soc_data jz4740_adc_soc_data = { + .battery_high_vref = JZ4740_BATTERY_HIGH_VREF, + .battery_high_vref_bits = JZ4740_BATTERY_HIGH_VREF_BITS, + .battery_raw_avail = jz4740_adc_battery_raw_avail, + .battery_raw_avail_size = ARRAY_SIZE(jz4740_adc_battery_raw_avail), + .battery_scale_avail = jz4740_adc_battery_scale_avail, + .battery_scale_avail_size = ARRAY_SIZE(jz4740_adc_battery_scale_avail), +}; + +static int ingenic_adc_read_avail(struct iio_dev *iio_dev, + struct iio_chan_spec const *chan, + const int **vals, + int *type, + int *length, + long m) +{ + struct ingenic_adc *adc = iio_priv(iio_dev); + + switch (m) { + case IIO_CHAN_INFO_RAW: + *type = IIO_VAL_INT; + *length = adc->soc_data->battery_raw_avail_size; + *vals = adc->soc_data->battery_raw_avail; + return IIO_AVAIL_RANGE; + case IIO_CHAN_INFO_SCALE: + *type = IIO_VAL_FRACTIONAL_LOG2; + *length = adc->soc_data->battery_scale_avail_size; + *vals = adc->soc_data->battery_scale_avail; + return IIO_AVAIL_LIST; + default: + return -EINVAL; + }; +} + +static int ingenic_adc_read_raw(struct iio_dev *iio_dev, + struct iio_chan_spec const *chan, + int *val, + int *val2, + long m) +{ + struct ingenic_adc *adc = iio_priv(iio_dev); + int ret; + + switch (m) { + case IIO_CHAN_INFO_RAW: + clk_enable(adc->clk); + ret = ingenic_adc_capture(adc, chan->channel); + if (ret) { + clk_disable(adc->clk); + return ret; + } + + switch (chan->channel) { + case INGENIC_ADC_AUX: + *val = readw(adc->base + JZ_ADC_REG_ADSDAT); + break; + case INGENIC_ADC_BATTERY: + *val = readw(adc->base + JZ_ADC_REG_ADBDAT); + break; + } + + clk_disable(adc->clk); + + return IIO_VAL_INT; + case IIO_CHAN_INFO_SCALE: + switch (chan->channel) { + case INGENIC_ADC_AUX: + *val = AUX_VREF; + *val2 = AUX_VREF_BITS; + break; + case INGENIC_ADC_BATTERY: + if (adc->low_vref_mode) { + *val = BATTERY_LOW_VREF; + *val2 = BATTERY_LOW_VREF_BITS; + } else { + *val = adc->soc_data->battery_high_vref; + *val2 = adc->soc_data->battery_high_vref_bits; + } + break; + } + + return IIO_VAL_FRACTIONAL_LOG2; + default: + return -EINVAL; + } +} + +static const struct iio_info ingenic_adc_info = { + .write_raw = ingenic_adc_write_raw, + .read_raw = ingenic_adc_read_raw, + .read_avail = ingenic_adc_read_avail, +}; + +static const struct iio_chan_spec ingenic_channels[] = { + { + .extend_name = "aux", + .type = IIO_VOLTAGE, + .info_mask_separate = BIT(IIO_CHAN_INFO_RAW) | + BIT(IIO_CHAN_INFO_SCALE), + .indexed = 1, + .channel = INGENIC_ADC_AUX, + }, + { + .extend_name = "battery", + .type = IIO_VOLTAGE, + .info_mask_separate = BIT(IIO_CHAN_INFO_RAW) | + BIT(IIO_CHAN_INFO_SCALE), + .info_mask_separate_available = BIT(IIO_CHAN_INFO_RAW) | + BIT(IIO_CHAN_INFO_SCALE), + .indexed = 1, + .channel = INGENIC_ADC_BATTERY, + }, +}; + +static int ingenic_adc_probe(struct platform_device *pdev) +{ + struct iio_dev *iio_dev; + struct ingenic_adc *adc; + struct resource *mem_base; + const struct ingenic_adc_soc_data *soc_data; + int ret; + + soc_data = device_get_match_data(&pdev->dev); + if (!soc_data) + return -EINVAL; + + iio_dev = devm_iio_device_alloc(&pdev->dev, sizeof(*adc)); + if (!iio_dev) + return -ENOMEM; + + adc = iio_priv(iio_dev); + spin_lock_init(&adc->lock); + adc->soc_data = soc_data; + + mem_base = platform_get_resource(pdev, IORESOURCE_MEM, 0); + adc->base = devm_ioremap_resource(&pdev->dev, mem_base); + if (IS_ERR(adc->base)) { + dev_err(&pdev->dev, "Unable to ioremap mmio resource\n"); + return PTR_ERR(adc->base); + } + + adc->clk = devm_clk_get(&pdev->dev, "adc"); + if (IS_ERR(adc->clk)) { + dev_err(&pdev->dev, "Unable to get clock\n"); + return PTR_ERR(adc->clk); + } + + ret = clk_prepare_enable(adc->clk); + if (ret) { + dev_err(&pdev->dev, "Failed to enable clock\n"); + return ret; + } + + /* Put hardware in a known passive state. */ + writeb(0x00, adc->base + JZ_ADC_REG_ENABLE); + writeb(0xff, adc->base + JZ_ADC_REG_CTRL); + clk_disable(adc->clk); + + devm_add_action(&pdev->dev, (void (*)(void *))clk_unprepare, adc->clk); + + iio_dev->dev.parent = &pdev->dev; + iio_dev->name = "adc"; + iio_dev->modes = INDIO_DIRECT_MODE; + iio_dev->channels = ingenic_channels; + iio_dev->num_channels = ARRAY_SIZE(ingenic_channels); + iio_dev->info = &ingenic_adc_info; + + ret = devm_iio_device_register(&pdev->dev, iio_dev); + if (ret) { + dev_err(&pdev->dev, "Unable to register IIO device\n"); + return ret; + } + + return 0; +} + +#ifdef CONFIG_OF +static const struct of_device_id ingenic_adc_of_match[] = { + { .compatible = "ingenic,jz4725b-adc", .data = &jz4725b_adc_soc_data, }, + { .compatible = "ingenic,jz4740-adc", .data = &jz4740_adc_soc_data, }, + { }, +}; +MODULE_DEVICE_TABLE(of, ingenic_adc_of_match); +#endif + +static struct platform_driver ingenic_adc_driver = { + .driver = { + .name = "ingenic-adc", + .of_match_table = of_match_ptr(ingenic_adc_of_match), + }, + .probe = ingenic_adc_probe, +}; +module_platform_driver(ingenic_adc_driver); -- 2.20.1