From patchwork Sun Aug 18 05:18:58 2013 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: "Lad, Prabhakar" X-Patchwork-Id: 2846145 Return-Path: X-Original-To: patchwork-linux-arm@patchwork.kernel.org Delivered-To: patchwork-parsemail@patchwork2.web.kernel.org Received: from mail.kernel.org (mail.kernel.org [198.145.19.201]) by patchwork2.web.kernel.org (Postfix) with ESMTP id 86D92BF547 for ; Sun, 18 Aug 2013 05:21:19 +0000 (UTC) Received: from mail.kernel.org (localhost [127.0.0.1]) by mail.kernel.org (Postfix) with ESMTP id 5372E20263 for ; Sun, 18 Aug 2013 05:21:18 +0000 (UTC) Received: from casper.infradead.org (casper.infradead.org [85.118.1.10]) (using TLSv1 with cipher DHE-RSA-AES256-SHA (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id B289D2020F for ; Sun, 18 Aug 2013 05:21:16 +0000 (UTC) Received: from merlin.infradead.org ([2001:4978:20e::2]) by casper.infradead.org with esmtps (Exim 4.80.1 #2 (Red Hat Linux)) id 1VAvPy-0003DO-TE; Sun, 18 Aug 2013 05:20:47 +0000 Received: from localhost ([::1] helo=merlin.infradead.org) by merlin.infradead.org with esmtp (Exim 4.80.1 #2 (Red Hat Linux)) id 1VAvPl-0007TN-I7; Sun, 18 Aug 2013 05:20:33 +0000 Received: from mail-pa0-x22c.google.com ([2607:f8b0:400e:c03::22c]) by merlin.infradead.org with esmtps (Exim 4.80.1 #2 (Red Hat Linux)) id 1VAvPh-0007Rt-PR for linux-arm-kernel@lists.infradead.org; Sun, 18 Aug 2013 05:20:31 +0000 Received: by mail-pa0-f44.google.com with SMTP id fz6so3442881pac.3 for ; Sat, 17 Aug 2013 22:20:08 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20120113; h=from:to:cc:subject:date:message-id:in-reply-to:references; bh=82FyIwJxMUyGSx7CFbvnm2Xhu3EiwoCzzqTnhbnG9Fo=; b=Ut7AH8RqRYGHFQmh1bMvsv0VWp3fY2l7zw6YmygjdvhP+SSF4o/k78T5vHU0TExqgM aEhtqQcuY7NqOYxGMArm09ZpQ0LoHOInloatcTbRTBTVAdSpWSAnmmlmFxEXoBuJWmEZ KdHwU3KRuPaow/OxWzy40louVqub+LSArNhRtLbgw3+xJDbUwG8L7YATtVXoM7M4+fdw 12jLR2XocOk0xPFJbtYxwB7tW1rpHLhCRiUsQJLNm53pRDe0jVuqEwgWKFfY/OvdlA8n IaIg5vrH+M0p/y7WFF5g6jNOvw9QisEPCpMlnWC27TwJfiBCuha/mQY2WwddHYDxWszB s8kQ== X-Received: by 10.68.139.226 with SMTP id rb2mr6355390pbb.79.1376803208244; Sat, 17 Aug 2013 22:20:08 -0700 (PDT) Received: from localhost.localdomain ([112.79.40.224]) by mx.google.com with ESMTPSA id pq1sm7175496pbb.26.1969.12.31.16.00.00 (version=TLSv1.1 cipher=ECDHE-RSA-RC4-SHA bits=128/128); Sat, 17 Aug 2013 22:20:07 -0700 (PDT) From: "Lad, Prabhakar" To: DLOS , Sekhar Nori Subject: [PATCH v3 2/7] gpio: davinci: move to platform device Date: Sun, 18 Aug 2013 10:48:58 +0530 Message-Id: <1376803143-13738-3-git-send-email-prabhakar.csengg@gmail.com> X-Mailer: git-send-email 1.7.9.5 In-Reply-To: <1376803143-13738-1-git-send-email-prabhakar.csengg@gmail.com> References: <1376803143-13738-1-git-send-email-prabhakar.csengg@gmail.com> X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20130818_012030_103423_404AFDF1 X-CRM114-Status: GOOD ( 28.27 ) X-Spam-Score: -2.0 (--) Cc: Kevin Hilman , Linus Walleij , LKML , "Lad, Prabhakar" , KV Sujith , Grant Likely , LAK X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.15 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , MIME-Version: 1.0 Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+patchwork-linux-arm=patchwork.kernel.org@lists.infradead.org X-Spam-Status: No, score=-6.9 required=5.0 tests=BAYES_00, DKIM_ADSP_CUSTOM_MED, DKIM_SIGNED, FREEMAIL_FROM, RCVD_IN_DNSWL_MED, RP_MATCHES_RCVD, T_DKIM_INVALID, UNPARSEABLE_RELAY autolearn=unavailable version=3.3.1 X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on mail.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP From: KV Sujith Modify GPIO Davinci driver to be compliant to standard platform drivers. The driver did not have platform driver structure or a probe. Instead, had a davinci_gpio_setup() function which is called in the pure_init sequence. The function also had dependency on davinci_soc_info structure of the corresponding platform. For Device Tree(DT) implementation, we need to get rid of the dependency on the davinci_soc_info structure. Hence as a first stage of DT conversion, we implement a probe. Future commits shall modify the probe to read platform related data from DT. - Add platform_driver structure and driver register function for davinci GPIO driver. The driver registration is made to happen in postcore_initcall. This is required since machine init functions like da850_lcd_hw_init() make use of GPIO. - Convert the davinci_gpio_setup() to davinci_gpio_probe(). - Remove access of members in soc_info structure. Instead, relevant data are taken from davinci_gpio_platform_data structure pointed by pdev->dev.platform_data. - Change clk_get() to devm_clk_get() as devm_clk_get() is a device managed function and makes error handling simpler. - Change pr_err to dev_err for gpio error reporting. - Add struct davinci_gpio_platform_data davinci for gpio module. Signed-off-by: KV Sujith [avinashphilip@ti.com: Move global definition for "struct davinci_gpio_controller" variable to local in probe and set it as driver data.] Signed-off-by: Philip Avinash Acked-by: Linus Walleij [nsekhar@ti.com: dropped unused structure member, rebased on new clean-up patch and fixes error messages] Signed-off-by: Sekhar Nori Signed-off-by: Lad, Prabhakar --- arch/arm/mach-davinci/include/mach/gpio-davinci.h | 1 + drivers/gpio/gpio-davinci.c | 123 ++++++++++++++------- include/linux/platform_data/gpio-davinci.h | 25 +++++ 3 files changed, 111 insertions(+), 38 deletions(-) create mode 100644 include/linux/platform_data/gpio-davinci.h diff --git a/arch/arm/mach-davinci/include/mach/gpio-davinci.h b/arch/arm/mach-davinci/include/mach/gpio-davinci.h index 1fdd1fd..551ba43 100644 --- a/arch/arm/mach-davinci/include/mach/gpio-davinci.h +++ b/arch/arm/mach-davinci/include/mach/gpio-davinci.h @@ -60,6 +60,7 @@ struct davinci_gpio_controller { void __iomem *set_data; void __iomem *clr_data; void __iomem *in_data; + unsigned gpio_irq; }; /* The __gpio_to_controller() and __gpio_mask() functions inline to constants diff --git a/drivers/gpio/gpio-davinci.c b/drivers/gpio/gpio-davinci.c index af7ea0b..268ba80 100644 --- a/drivers/gpio/gpio-davinci.c +++ b/drivers/gpio/gpio-davinci.c @@ -10,12 +10,17 @@ * (at your option) any later version. */ #include +#include #include #include #include +#include +#include +#include #include - -#include +#include +#include +#include struct davinci_gpio_regs { u32 dir; @@ -35,10 +40,9 @@ struct davinci_gpio_regs { #define chip2controller(chip) \ container_of(chip, struct davinci_gpio_controller, chip) -static struct davinci_gpio_controller chips[DIV_ROUND_UP(DAVINCI_N_GPIO, 32)]; static void __iomem *gpio_base; -static struct davinci_gpio_regs __iomem __init *gpio2regs(unsigned gpio) +static struct davinci_gpio_regs __iomem *gpio2regs(unsigned gpio) { void __iomem *ptr; @@ -66,7 +70,7 @@ static inline struct davinci_gpio_regs __iomem *irq2regs(int irq) return g; } -static int __init davinci_gpio_irq_setup(void); +static int davinci_gpio_irq_setup(struct platform_device *pdev); /*--------------------------------------------------------------------------*/ @@ -132,33 +136,53 @@ davinci_gpio_set(struct gpio_chip *chip, unsigned offset, int value) __raw_writel((1 << offset), value ? &g->set_data : &g->clr_data); } -static int __init davinci_gpio_setup(void) +static int davinci_gpio_probe(struct platform_device *pdev) { int i, base; unsigned ngpio; - struct davinci_soc_info *soc_info = &davinci_soc_info; - struct davinci_gpio_regs *regs; - - if (soc_info->gpio_type != GPIO_TYPE_DAVINCI) - return 0; + struct davinci_gpio_controller *chips; + struct davinci_gpio_platform_data *pdata; + struct davinci_gpio_regs __iomem *regs; + struct device *dev = &pdev->dev; + struct resource *res; + + pdata = dev->platform_data; + if (!pdata) { + dev_err(dev, "No platform data found\n"); + return -EINVAL; + } /* * The gpio banks conceptually expose a segmented bitmap, * and "ngpio" is one more than the largest zero-based * bit index that's valid. */ - ngpio = soc_info->gpio_num; + ngpio = pdata->ngpio; if (ngpio == 0) { - pr_err("GPIO setup: how many GPIOs?\n"); + dev_err(dev, "How many GPIOs?\n"); return -EINVAL; } if (WARN_ON(DAVINCI_N_GPIO < ngpio)) ngpio = DAVINCI_N_GPIO; - gpio_base = ioremap(soc_info->gpio_base, SZ_4K); - if (WARN_ON(!gpio_base)) + chips = devm_kzalloc(dev, + ngpio * sizeof(struct davinci_gpio_controller), + GFP_KERNEL); + if (!chips) { + dev_err(dev, "Memory allocation failed\n"); return -ENOMEM; + } + + res = platform_get_resource(pdev, IORESOURCE_MEM, 0); + if (unlikely(!res)) { + dev_err(dev, "Invalid memory resource\n"); + return -EBUSY; + } + + gpio_base = devm_ioremap_resource(dev, res); + if (IS_ERR(gpio_base)) + return PTR_ERR(gpio_base); for (i = 0, base = 0; base < ngpio; i++, base += 32) { chips[i].chip.label = "DaVinci"; @@ -184,13 +208,10 @@ static int __init davinci_gpio_setup(void) gpiochip_add(&chips[i].chip); } - soc_info->gpio_ctlrs = chips; - soc_info->gpio_ctlrs_num = DIV_ROUND_UP(ngpio, 32); - - davinci_gpio_irq_setup(); + platform_set_drvdata(pdev, chips); + davinci_gpio_irq_setup(pdev); return 0; } -pure_initcall(davinci_gpio_setup); /*--------------------------------------------------------------------------*/ /* @@ -303,14 +324,14 @@ static int gpio_to_irq_banked(struct gpio_chip *chip, unsigned offset) static int gpio_to_irq_unbanked(struct gpio_chip *chip, unsigned offset) { - struct davinci_soc_info *soc_info = &davinci_soc_info; + struct davinci_gpio_controller *d = chip2controller(chip); /* * NOTE: we assume for now that only irqs in the first gpio_chip * can provide direct-mapped IRQs to AINTC (up to 32 GPIOs). */ - if (offset < soc_info->gpio_unbanked) - return soc_info->gpio_irq + offset; + if (offset < d->irq_base) + return d->gpio_irq + offset; else return -ENODEV; } @@ -319,12 +340,11 @@ static int gpio_irq_type_unbanked(struct irq_data *data, unsigned trigger) { struct davinci_gpio_controller *d; struct davinci_gpio_regs __iomem *g; - struct davinci_soc_info *soc_info = &davinci_soc_info; u32 mask; d = (struct davinci_gpio_controller *)data->handler_data; g = (struct davinci_gpio_regs __iomem *)d->regs; - mask = __gpio_mask(data->irq - soc_info->gpio_irq); + mask = __gpio_mask(data->irq - d->gpio_irq); if (trigger & ~(IRQ_TYPE_EDGE_FALLING | IRQ_TYPE_EDGE_RISING)) return -EINVAL; @@ -345,24 +365,33 @@ static int gpio_irq_type_unbanked(struct irq_data *data, unsigned trigger) * (dm6446) can be set appropriately for GPIOV33 pins. */ -static int __init davinci_gpio_irq_setup(void) +static int davinci_gpio_irq_setup(struct platform_device *pdev) { unsigned gpio, irq, bank; struct clk *clk; u32 binten = 0; unsigned ngpio, bank_irq; - struct davinci_soc_info *soc_info = &davinci_soc_info; - struct davinci_gpio_regs __iomem *g; + struct device *dev = &pdev->dev; + struct resource *res; + struct davinci_gpio_controller *chips = platform_get_drvdata(pdev); + struct davinci_gpio_platform_data *pdata = dev->platform_data; + struct davinci_gpio_regs __iomem *g; - ngpio = soc_info->gpio_num; + ngpio = pdata->ngpio; + res = platform_get_resource(pdev, IORESOURCE_IRQ, 0); + if (unlikely(!res)) { + dev_err(dev, "Invalid IRQ resource\n"); + return -EBUSY; + } - bank_irq = soc_info->gpio_irq; - if (bank_irq == 0) { - printk(KERN_ERR "Don't know first GPIO bank IRQ.\n"); - return -EINVAL; + bank_irq = res->start; + + if (unlikely(!bank_irq)) { + dev_err(dev, "Invalid IRQ resource\n"); + return -ENODEV; } - clk = clk_get(NULL, "gpio"); + clk = devm_clk_get(dev, "gpio"); if (IS_ERR(clk)) { printk(KERN_ERR "Error %ld getting gpio clock?\n", PTR_ERR(clk)); @@ -378,9 +407,9 @@ static int __init davinci_gpio_irq_setup(void) */ for (gpio = 0, bank = 0; gpio < ngpio; bank++, gpio += 32) { chips[bank].chip.to_irq = gpio_to_irq_banked; - chips[bank].irq_base = soc_info->gpio_unbanked + chips[bank].irq_base = pdata->gpio_unbanked ? -EINVAL - : (soc_info->intc_irq_num + gpio); + : (pdata->intc_irq_num + gpio); } /* @@ -388,7 +417,7 @@ static int __init davinci_gpio_irq_setup(void) * controller only handling trigger modes. We currently assume no * IRQ mux conflicts; gpio_irq_type_unbanked() is only for GPIOs. */ - if (soc_info->gpio_unbanked) { + if (pdata->gpio_unbanked) { static struct irq_chip_type gpio_unbanked; /* pass "bank 0" GPIO IRQs to AINTC */ @@ -408,7 +437,7 @@ static int __init davinci_gpio_irq_setup(void) __raw_writel(~0, &g->set_rising); /* set the direct IRQs up to use that irqchip */ - for (gpio = 0; gpio < soc_info->gpio_unbanked; gpio++, irq++) { + for (gpio = 0; gpio < pdata->gpio_unbanked; gpio++, irq++) { irq_set_chip(irq, &gpio_unbanked.chip); irq_set_handler_data(irq, &chips[gpio / 32]); irq_set_status_flags(irq, IRQ_TYPE_EDGE_BOTH); @@ -463,3 +492,21 @@ done: return 0; } + +static struct platform_driver davinci_gpio_driver = { + .probe = davinci_gpio_probe, + .driver = { + .name = "davinci_gpio", + .owner = THIS_MODULE, + }, +}; + +/** + * GPIO driver registration needs to be done before machine_init functions + * access GPIO. Hence davinci_gpio_drv_reg() is a postcore_initcall. + */ +static int __init davinci_gpio_drv_reg(void) +{ + return platform_driver_register(&davinci_gpio_driver); +} +postcore_initcall(davinci_gpio_drv_reg); diff --git a/include/linux/platform_data/gpio-davinci.h b/include/linux/platform_data/gpio-davinci.h new file mode 100644 index 0000000..2fcc125 --- /dev/null +++ b/include/linux/platform_data/gpio-davinci.h @@ -0,0 +1,25 @@ +/* + * DaVinci GPIO Platform Related Defines + * + * Copyright (C) 2013 Texas Instruments Incorporated - http://www.ti.com/ + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of the GNU General Public License as + * published by the Free Software Foundation version 2. + * + * This program is distributed "as is" WITHOUT ANY WARRANTY of any + * kind, whether express or implied; without even the implied warranty + * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + */ + +#ifndef __DAVINCI_GPIO_PLATFORM_H +#define __DAVINCI_GPIO_PLATFORM_H + +struct davinci_gpio_platform_data { + u32 ngpio; + u32 gpio_unbanked; + u32 intc_irq_num; +}; + +#endif