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=-7.0 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_PATCH,MAILING_LIST_MULTI,SIGNED_OFF_BY,SPF_HELO_NONE,SPF_PASS, UNWANTED_LANGUAGE_BODY,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 87F57C433E0 for ; Fri, 19 Jun 2020 01:48:28 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 6DB662080D for ; Fri, 19 Jun 2020 01:48:28 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1730741AbgFSBsN (ORCPT ); Thu, 18 Jun 2020 21:48:13 -0400 Received: from mga06.intel.com ([134.134.136.31]:64012 "EHLO mga06.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1730797AbgFSBsJ (ORCPT ); Thu, 18 Jun 2020 21:48:09 -0400 IronPort-SDR: xedQirwFkK9649mf1VdVAkI8FzWo0m+JR3HpTBvKH5dJKOuzsO2sO3CEYbLCgqcnG305gZrx44 zguCOJcrWYVA== X-IronPort-AV: E=McAfee;i="6000,8403,9656"; a="204278281" X-IronPort-AV: E=Sophos;i="5.75,253,1589266800"; d="scan'208";a="204278281" X-Amp-Result: SKIPPED(no attachment in message) X-Amp-File-Uploaded: False Received: from fmsmga008.fm.intel.com ([10.253.24.58]) by orsmga104.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 18 Jun 2020 18:47:59 -0700 IronPort-SDR: KpZpnspTDJ7oCtB7qC18r5vj5K9dtyNzANC4rts4oTsg/POLp6/igY3FPIQaPfDzw66s+W1Fna VAcbYJ6mNGQA== X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.75,253,1589266800"; d="scan'208";a="263746043" Received: from yilunxu-optiplex-7050.sh.intel.com ([10.239.159.141]) by fmsmga008.fm.intel.com with ESMTP; 18 Jun 2020 18:47:57 -0700 From: Xu Yilun To: broonie@kernel.org, linux-spi@vger.kernel.org, linux-kernel@vger.kernel.org Cc: trix@redhat.com, yilun.xu@intel.com, hao.wu@intel.com, matthew.gerlach@linux.intel.com, russell.h.weight@intel.com Subject: [RESEND PATCH v2 1/3] spi: altera: use regmap-mmio instead of direct mmio register access Date: Fri, 19 Jun 2020 09:43:39 +0800 Message-Id: <1592531021-11412-2-git-send-email-yilun.xu@intel.com> X-Mailer: git-send-email 2.7.4 In-Reply-To: <1592531021-11412-1-git-send-email-yilun.xu@intel.com> References: <1592531021-11412-1-git-send-email-yilun.xu@intel.com> Sender: linux-spi-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-spi@vger.kernel.org This patch adds support for regmap. It makes preparation for supporting different ways to access the registers. Signed-off-by: Matthew Gerlach Signed-off-by: Wu Hao Signed-off-by: Xu Yilun Signed-off-by: Russ Weight Reviewed-by : Tom Rix --- drivers/spi/Kconfig | 1 + drivers/spi/spi-altera.c | 91 ++++++++++++++++++++++++++++++++++++++---------- 2 files changed, 73 insertions(+), 19 deletions(-) diff --git a/drivers/spi/Kconfig b/drivers/spi/Kconfig index 8f1f8fc..6d79fc7 100644 --- a/drivers/spi/Kconfig +++ b/drivers/spi/Kconfig @@ -59,6 +59,7 @@ comment "SPI Master Controller Drivers" config SPI_ALTERA tristate "Altera SPI Controller" + select REGMAP_MMIO help This is the driver for the Altera SPI Controller. diff --git a/drivers/spi/spi-altera.c b/drivers/spi/spi-altera.c index aa9d1a2..b215bdf 100644 --- a/drivers/spi/spi-altera.c +++ b/drivers/spi/spi-altera.c @@ -44,7 +44,6 @@ #define ALTERA_SPI_MAX_CS 32 struct altera_spi { - void __iomem *base; int irq; int len; int count; @@ -54,8 +53,43 @@ struct altera_spi { /* data buffers */ const unsigned char *tx; unsigned char *rx; + + struct regmap *regmap; + struct device *dev; +}; + +static const struct regmap_config spi_altera_config = { + .reg_bits = 32, + .reg_stride = 4, + .val_bits = 32, + .fast_io = true, }; +static int altr_spi_writel(struct altera_spi *hw, unsigned int reg, + unsigned int val) +{ + int ret; + + ret = regmap_write(hw->regmap, reg, val); + if (ret) + dev_err(hw->dev, "fail to write reg 0x%x val 0x%x: %d\n", + reg, val, ret); + + return ret; +} + +static int altr_spi_readl(struct altera_spi *hw, unsigned int reg, + unsigned int *val) +{ + int ret; + + ret = regmap_read(hw->regmap, reg, val); + if (ret) + dev_err(hw->dev, "fail to read reg 0x%x: %d\n", reg, ret); + + return ret; +} + static inline struct altera_spi *altera_spi_to_hw(struct spi_device *sdev) { return spi_master_get_devdata(sdev->master); @@ -67,12 +101,13 @@ static void altera_spi_set_cs(struct spi_device *spi, bool is_high) if (is_high) { hw->imr &= ~ALTERA_SPI_CONTROL_SSO_MSK; - writel(hw->imr, hw->base + ALTERA_SPI_CONTROL); - writel(0, hw->base + ALTERA_SPI_SLAVE_SEL); + altr_spi_writel(hw, ALTERA_SPI_CONTROL, hw->imr); + altr_spi_writel(hw, ALTERA_SPI_SLAVE_SEL, 0); } else { - writel(BIT(spi->chip_select), hw->base + ALTERA_SPI_SLAVE_SEL); + altr_spi_writel(hw, ALTERA_SPI_SLAVE_SEL, + BIT(spi->chip_select)); hw->imr |= ALTERA_SPI_CONTROL_SSO_MSK; - writel(hw->imr, hw->base + ALTERA_SPI_CONTROL); + altr_spi_writel(hw, ALTERA_SPI_CONTROL, hw->imr); } } @@ -99,14 +134,14 @@ static void altera_spi_tx_word(struct altera_spi *hw) } } - writel(txd, hw->base + ALTERA_SPI_TXDATA); + altr_spi_writel(hw, ALTERA_SPI_TXDATA, txd); } static void altera_spi_rx_word(struct altera_spi *hw) { unsigned int rxd; - rxd = readl(hw->base + ALTERA_SPI_RXDATA); + altr_spi_readl(hw, ALTERA_SPI_RXDATA, &rxd); if (hw->rx) { switch (hw->bytes_per_word) { case 1: @@ -133,6 +168,7 @@ static int altera_spi_txrx(struct spi_master *master, struct spi_device *spi, struct spi_transfer *t) { struct altera_spi *hw = spi_master_get_devdata(master); + u32 val; hw->tx = t->tx_buf; hw->rx = t->rx_buf; @@ -143,7 +179,7 @@ static int altera_spi_txrx(struct spi_master *master, if (hw->irq >= 0) { /* enable receive interrupt */ hw->imr |= ALTERA_SPI_CONTROL_IRRDY_MSK; - writel(hw->imr, hw->base + ALTERA_SPI_CONTROL); + altr_spi_writel(hw, ALTERA_SPI_CONTROL, hw->imr); /* send the first byte */ altera_spi_tx_word(hw); @@ -151,9 +187,13 @@ static int altera_spi_txrx(struct spi_master *master, while (hw->count < hw->len) { altera_spi_tx_word(hw); - while (!(readl(hw->base + ALTERA_SPI_STATUS) & - ALTERA_SPI_STATUS_RRDY_MSK)) + for (;;) { + altr_spi_readl(hw, ALTERA_SPI_STATUS, &val); + if (val & ALTERA_SPI_STATUS_RRDY_MSK) + break; + cpu_relax(); + } altera_spi_rx_word(hw); } @@ -175,7 +215,7 @@ static irqreturn_t altera_spi_irq(int irq, void *dev) } else { /* disable receive interrupt */ hw->imr &= ~ALTERA_SPI_CONTROL_IRRDY_MSK; - writel(hw->imr, hw->base + ALTERA_SPI_CONTROL); + altr_spi_writel(hw, ALTERA_SPI_CONTROL, hw->imr); spi_finalize_current_transfer(master); } @@ -188,7 +228,9 @@ static int altera_spi_probe(struct platform_device *pdev) struct altera_spi_platform_data *pdata = dev_get_platdata(&pdev->dev); struct altera_spi *hw; struct spi_master *master; + void __iomem *res; int err = -ENODEV; + u32 val; u16 i; master = spi_alloc_master(&pdev->dev, sizeof(struct altera_spi)); @@ -220,19 +262,30 @@ static int altera_spi_probe(struct platform_device *pdev) master->set_cs = altera_spi_set_cs; hw = spi_master_get_devdata(master); + hw->dev = &pdev->dev; /* find and map our resources */ - hw->base = devm_platform_ioremap_resource(pdev, 0); - if (IS_ERR(hw->base)) { - err = PTR_ERR(hw->base); + res = devm_platform_ioremap_resource(pdev, 0); + if (IS_ERR(res)) { + err = PTR_ERR(res); goto exit; } + + hw->regmap = devm_regmap_init_mmio(&pdev->dev, res, + &spi_altera_config); + if (IS_ERR(hw->regmap)) { + dev_err(&pdev->dev, "regmap mmio init failed\n"); + err = PTR_ERR(hw->regmap); + goto exit; + } + /* program defaults into the registers */ hw->imr = 0; /* disable spi interrupts */ - writel(hw->imr, hw->base + ALTERA_SPI_CONTROL); - writel(0, hw->base + ALTERA_SPI_STATUS); /* clear status reg */ - if (readl(hw->base + ALTERA_SPI_STATUS) & ALTERA_SPI_STATUS_RRDY_MSK) - readl(hw->base + ALTERA_SPI_RXDATA); /* flush rxdata */ + altr_spi_writel(hw, ALTERA_SPI_CONTROL, hw->imr); + altr_spi_writel(hw, ALTERA_SPI_STATUS, 0); /* clear status reg */ + altr_spi_readl(hw, ALTERA_SPI_STATUS, &val); + if (val & ALTERA_SPI_STATUS_RRDY_MSK) + altr_spi_readl(hw, ALTERA_SPI_RXDATA, &val); /* flush rxdata */ /* irq is optional */ hw->irq = platform_get_irq(pdev, 0); if (hw->irq >= 0) { @@ -255,7 +308,7 @@ static int altera_spi_probe(struct platform_device *pdev) } } - dev_info(&pdev->dev, "base %p, irq %d\n", hw->base, hw->irq); + dev_info(&pdev->dev, "base %p, irq %d\n", res, hw->irq); return 0; exit: -- 2.7.4