From patchwork Fri Apr 2 10:12:40 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Syed Nayyar Waris X-Patchwork-Id: 414781 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=-14.2 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,FREEMAIL_FORGED_FROMDOMAIN,FREEMAIL_FROM, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,USER_AGENT_SANE_1 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 DE7A5C433B4 for ; Fri, 2 Apr 2021 10:12:59 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id B5D506113D for ; Fri, 2 Apr 2021 10:12:59 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S234448AbhDBKM7 (ORCPT ); Fri, 2 Apr 2021 06:12:59 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:47132 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229605AbhDBKM7 (ORCPT ); Fri, 2 Apr 2021 06:12:59 -0400 Received: from mail-pj1-x102f.google.com (mail-pj1-x102f.google.com [IPv6:2607:f8b0:4864:20::102f]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id A7D64C0613E6; Fri, 2 Apr 2021 03:12:58 -0700 (PDT) Received: by mail-pj1-x102f.google.com with SMTP id t18so2494086pjs.3; Fri, 02 Apr 2021 03:12:58 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=date:from:to:cc:subject:message-id:references:mime-version :content-disposition:in-reply-to:user-agent; bh=elvUwGrM418CXLIilNL/fwznJq0Mnf7UxWCgH8HJ9kg=; b=bxdBUcsc7T9mo2Lnd8uMQDUsshtUfkbRETbQsHPYB42RrNZ/m6ZOlhgozDLroTZYrN eON3MNfx2OHeuXOJ9Y0YosiPoGZ4eTRY0qPUvRXgcO2YAm64TkPJGRpj/ZP+IcFsKeHD hdYliySd+aDZPAVFw13NX0eJV4O8AR8edPEiM56usn6f5njihh4NOYdzH/AQprkH5VfK +9oDbjJEVymVdL03W10jK2IQtcd3wRhPVZdHwqbzwhbSE7wcJFaamH2iaB+U8agkvHuU SA94JWSWRiQKj+r0Hp1lRaU7pRxo1w36l3v6UFmsUfDBaeMO9Afp/l10N45s+Un3G9bX NZiQ== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:date:from:to:cc:subject:message-id:references :mime-version:content-disposition:in-reply-to:user-agent; bh=elvUwGrM418CXLIilNL/fwznJq0Mnf7UxWCgH8HJ9kg=; b=JhmSIrunidrbZt5lLp/uV7/W+IiYdDCjlGVQegADCeTvs1/Uzluoj3AYQlLsu67b5k nk6vbywCsD5b+VPjxlQJYNmvqIQZZ/zUPvmof9hJl7TaM//6z0TE1zubcV+H+JgjZr6r mX3qGYfW8FdS43Oj7s4rJ5VRd6PftDz1OLRgq0cQPGco/UmWU7J3D6jsIepC2kX/G1Ks vu3Ua46zjM8ILCJSYJW7f1GeXJsCTH1ABg75R/Gg5kh1u+Bl+8yWOKRqvYkcc8jQjGYI uP292bFhjEtSAIar0jHHylRUKuKPZs0GHM8P1TP1BGMg9WZzjM1NePB8CdgWVzVQ1nvw hMLw== X-Gm-Message-State: AOAM531V9+2rXLstK5ikPZO/1U668BYwxwUewAJQnjtvId8jQYImADvK zO3ShhXqP1p42bx/sAPhR54= X-Google-Smtp-Source: ABdhPJylA1WmAAVPuY/l/zHcqiwsL0HAoW7BKAkydfxcDxaVE/yXGSiIi6gPAbUvQDDTz+K36uZDUg== X-Received: by 2002:a17:902:b602:b029:e6:cabb:10b9 with SMTP id b2-20020a170902b602b02900e6cabb10b9mr11967011pls.47.1617358378281; Fri, 02 Apr 2021 03:12:58 -0700 (PDT) Received: from syed ([223.225.111.29]) by smtp.gmail.com with ESMTPSA id a18sm8419755pfa.18.2021.04.02.03.12.50 (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Fri, 02 Apr 2021 03:12:58 -0700 (PDT) Date: Fri, 2 Apr 2021 15:42:40 +0530 From: Syed Nayyar Waris To: bgolaszewski@baylibre.com Cc: andriy.shevchenko@linux.intel.com, vilhelm.gray@gmail.com, michal.simek@xilinx.com, arnd@arndb.de, rrichter@marvell.com, linus.walleij@linaro.org, bgolaszewski@baylibre.com, yamada.masahiro@socionext.com, akpm@linux-foundation.org, rui.zhang@intel.com, daniel.lezcano@linaro.org, amit.kucheria@verdurent.com, linux-arch@vger.kernel.org, linux-gpio@vger.kernel.org, linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-pm@vger.kernel.org Subject: [PATCH v4 3/3] gpio: xilinx: Utilize generic bitmap_get_value and _set_value Message-ID: <00d085d4068be651c58a61564926d4f3d495ab80.1617357235.git.syednwaris@gmail.com> References: MIME-Version: 1.0 Content-Disposition: inline In-Reply-To: User-Agent: Mutt/1.5.24 (2015-08-30) Precedence: bulk List-ID: X-Mailing-List: linux-pm@vger.kernel.org This patch reimplements the xgpio_set_multiple() function in drivers/gpio/gpio-xilinx.c to use the new generic functions: bitmap_get_value() and bitmap_set_value(). The code is now simpler to read and understand. Moreover, instead of looping for each bit in xgpio_set_multiple() function, now we can check each channel at a time and save cycles. Cc: Bartosz Golaszewski Cc: Michal Simek Signed-off-by: Syed Nayyar Waris Acked-by: William Breathitt Gray --- drivers/gpio/gpio-xilinx.c | 60 +++++++++++++++++++------------------- 1 file changed, 30 insertions(+), 30 deletions(-) diff --git a/drivers/gpio/gpio-xilinx.c b/drivers/gpio/gpio-xilinx.c index b411d3156e0b..e0ad3a81f216 100644 --- a/drivers/gpio/gpio-xilinx.c +++ b/drivers/gpio/gpio-xilinx.c @@ -18,6 +18,7 @@ #include #include #include +#include "gpiolib.h" /* Register Offset Definitions */ #define XGPIO_DATA_OFFSET (0x0) /* Data register */ @@ -161,37 +162,36 @@ static void xgpio_set_multiple(struct gpio_chip *gc, unsigned long *mask, { unsigned long flags; struct xgpio_instance *chip = gpiochip_get_data(gc); - int index = xgpio_index(chip, 0); - int offset, i; - spin_lock_irqsave(&chip->gpio_lock, flags); - - /* Write to GPIO signals */ - for (i = 0; i < gc->ngpio; i++) { - if (*mask == 0) - break; - /* Once finished with an index write it out to the register */ - if (index != xgpio_index(chip, i)) { - xgpio_writereg(chip->regs + XGPIO_DATA_OFFSET + - index * XGPIO_CHANNEL_OFFSET, - chip->gpio_state[index]); - spin_unlock_irqrestore(&chip->gpio_lock, flags); - index = xgpio_index(chip, i); - spin_lock_irqsave(&chip->gpio_lock, flags); - } - if (__test_and_clear_bit(i, mask)) { - offset = xgpio_offset(chip, i); - if (test_bit(i, bits)) - chip->gpio_state[index] |= BIT(offset); - else - chip->gpio_state[index] &= ~BIT(offset); - } - } - - xgpio_writereg(chip->regs + XGPIO_DATA_OFFSET + - index * XGPIO_CHANNEL_OFFSET, chip->gpio_state[index]); - - spin_unlock_irqrestore(&chip->gpio_lock, flags); + u32 *state = chip->gpio_state; + unsigned int *width = chip->gpio_width; + DECLARE_BITMAP(old, 64); + DECLARE_BITMAP(new, 64); + DECLARE_BITMAP(changed, 64); + + spin_lock_irqsave(&chip->gpio_lock, flags); + + /* Copy initial value of state bits into 'old' bit-wise */ + bitmap_set_value(old, 64, state[0], width[0], 0); + bitmap_set_value(old, 64, state[1], width[1], width[0]); + /* Copy value from 'old' into 'new' with mask applied */ + bitmap_replace(new, old, bits, mask, gc->ngpio); + + bitmap_from_arr32(old, state, 64); + /* Update 'state' */ + state[0] = bitmap_get_value(new, 0, width[0]); + state[1] = bitmap_get_value(new, width[0], width[1]); + bitmap_from_arr32(new, state, 64); + /* XOR operation sets only changed bits */ + bitmap_xor(changed, old, new, 64); + + if (((u32 *)changed)[0]) + xgpio_writereg(chip->regs + XGPIO_DATA_OFFSET, state[0]); + if (((u32 *)changed)[1]) + xgpio_writereg(chip->regs + XGPIO_DATA_OFFSET + + XGPIO_CHANNEL_OFFSET, state[1]); + + spin_unlock_irqrestore(&chip->gpio_lock, flags); } /**