From patchwork Tue Aug 19 22:07:51 2014 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Patchwork-Submitter: =?utf-8?q?Ga=C3=ABl_PORTAY?= X-Patchwork-Id: 381507 Return-Path: X-Original-To: incoming@patchwork.ozlabs.org Delivered-To: patchwork-incoming@bilbo.ozlabs.org Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by ozlabs.org (Postfix) with ESMTP id 3140F1400B2 for ; Wed, 20 Aug 2014 08:09:49 +1000 (EST) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752047AbaHSWJA (ORCPT ); Tue, 19 Aug 2014 18:09:00 -0400 Received: from mail-wi0-f171.google.com ([209.85.212.171]:57953 "EHLO mail-wi0-f171.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751733AbaHSWIT (ORCPT ); Tue, 19 Aug 2014 18:08:19 -0400 Received: by mail-wi0-f171.google.com with SMTP id hi2so6153329wib.4 for ; Tue, 19 Aug 2014 15:08:17 -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 :mime-version:content-type:content-transfer-encoding; bh=zdRiN22qU06fBVA4pUXd0T5kMY2/1BhfVLRI7HxGdqU=; b=WSQkLNnnpHXN49qOCzpM9wt+6MLP9gg8umlXpR6Ijlre8qAClLbs5XCUhCtGbyOROA WaU3hnhDM0oK+cODzE9fHBgo337G+Q5uZExNeuAW0PbNdObwhhz9otxhxGtcguQXWvkZ Kvm93Na6wdIqz9/EN/oIywyygQW+uMTGLBHvagD+kjzLAa2WzRLJU2K/bjVu9NAPAJ8y eLeEgz/aRP2dqjsnDPdX9Hi6ScF7BC+1XrYG2Q0YLM9jZv345uPStJkIDk+kpOpdpc/M 9Bu8psTWgTrnZEtkW9wuRpq1Rt0gq6veD/lcxppawgkX1drQzEFxrf1ugDrNlt2ASnMI 44iQ== X-Received: by 10.195.13.102 with SMTP id ex6mr52391607wjd.48.1408486097106; Tue, 19 Aug 2014 15:08:17 -0700 (PDT) Received: from localhost.localdomain (19-157-190-109.dsl.ovh.fr. [109.190.157.19]) by mx.google.com with ESMTPSA id kw1sm53518009wjb.19.2014.08.19.15.08.15 for (version=TLSv1.2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Tue, 19 Aug 2014 15:08:16 -0700 (PDT) From: =?UTF-8?q?Ga=C3=ABl=20PORTAY?= To: Arnd Bergmann , Daniel Lezcano , Greg Kroah-Hartman , linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, linux-pwm@vger.kernel.org, Nicolas Ferre , Thierry Reding , Thomas Gleixner Cc: Boris Brezillon , Alexandre Belloni , Jean-Christophe PLAGNIOL-VILLARD , =?utf-8?q?Ga=C3=ABl=20PORTAY?= Subject: [PATCH 2/3] ARM: at91/tclib: move initialization from alloc to probe Date: Wed, 20 Aug 2014 00:07:51 +0200 Message-Id: <1408486072-19268-3-git-send-email-gael.portay@gmail.com> X-Mailer: git-send-email 1.9.3 In-Reply-To: <1408486072-19268-1-git-send-email-gael.portay@gmail.com> References: <1408486072-19268-1-git-send-email-gael.portay@gmail.com> MIME-Version: 1.0 Sender: linux-pwm-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-pwm@vger.kernel.org Move resource retrieval from atmel_tc_alloc to tc_probe to avoid lately reporting resource related issues when a TC block user request a TC block. Moreover, resources retrieval are usually done in the probe function, thus moving them add some consistency with other drivers. Initialization is done once, ie not every time a tc block is requested. If it fails, the device is not appended to the list of tc blocks. Furhermore, the device id is retrieved at probe as well, avoiding parsing DT every time the user requests of tc block. Signed-off-by: Gaël PORTAY Acked-by: Thierry Reding Acked-by: Boris Brezillon --- drivers/clocksource/tcb_clksrc.c | 2 +- drivers/misc/atmel_tclib.c | 71 +++++++++++++--------------------------- drivers/pwm/pwm-atmel-tcb.c | 2 +- include/linux/atmel_tc.h | 8 +++-- 4 files changed, 29 insertions(+), 54 deletions(-) diff --git a/drivers/clocksource/tcb_clksrc.c b/drivers/clocksource/tcb_clksrc.c index a8d7ea1..f922e81 100644 --- a/drivers/clocksource/tcb_clksrc.c +++ b/drivers/clocksource/tcb_clksrc.c @@ -279,7 +279,7 @@ static int __init tcb_clksrc_init(void) int i; int ret; - tc = atmel_tc_alloc(CONFIG_ATMEL_TCB_CLKSRC_BLOCK, clksrc.name); + tc = atmel_tc_alloc(CONFIG_ATMEL_TCB_CLKSRC_BLOCK); if (!tc) { pr_debug("can't alloc TC for clocksource\n"); return -ENODEV; diff --git a/drivers/misc/atmel_tclib.c b/drivers/misc/atmel_tclib.c index b514a2d..d505d1e 100644 --- a/drivers/misc/atmel_tclib.c +++ b/drivers/misc/atmel_tclib.c @@ -35,60 +35,31 @@ static LIST_HEAD(tc_list); /** * atmel_tc_alloc - allocate a specified TC block * @block: which block to allocate - * @name: name to be associated with the iomem resource * * Caller allocates a block. If it is available, a pointer to a * pre-initialized struct atmel_tc is returned. The caller can access * the registers directly through the "regs" field. */ -struct atmel_tc *atmel_tc_alloc(unsigned block, const char *name) +struct atmel_tc *atmel_tc_alloc(unsigned block) { struct atmel_tc *tc; struct platform_device *pdev = NULL; - struct resource *r; - size_t size; spin_lock(&tc_list_lock); list_for_each_entry(tc, &tc_list, node) { - if (tc->pdev->dev.of_node) { - if (of_alias_get_id(tc->pdev->dev.of_node, "tcb") - == block) { - pdev = tc->pdev; - break; - } - } else if (tc->pdev->id == block) { + if (tc->allocated) + continue; + + if ((tc->pdev->dev.of_node && tc->id == block) || + (tc->pdev->id == block)) { pdev = tc->pdev; + tc->allocated = true; break; } } - - if (!pdev || tc->iomem) - goto fail; - - r = platform_get_resource(pdev, IORESOURCE_MEM, 0); - if (!r) - goto fail; - - size = resource_size(r); - r = request_mem_region(r->start, size, name); - if (!r) - goto fail; - - tc->regs = ioremap(r->start, size); - if (!tc->regs) - goto fail_ioremap; - - tc->iomem = r; - -out: spin_unlock(&tc_list_lock); - return tc; -fail_ioremap: - release_mem_region(r->start, size); -fail: - tc = NULL; - goto out; + return pdev ? tc : NULL; } EXPORT_SYMBOL_GPL(atmel_tc_alloc); @@ -96,19 +67,14 @@ EXPORT_SYMBOL_GPL(atmel_tc_alloc); * atmel_tc_free - release a specified TC block * @tc: Timer/counter block that was returned by atmel_tc_alloc() * - * This reverses the effect of atmel_tc_alloc(), unmapping the I/O - * registers, invalidating the resource returned by that routine and - * making the TC available to other drivers. + * This reverses the effect of atmel_tc_alloc(), invalidating the resource + * returned by that routine and making the TC available to other drivers. */ void atmel_tc_free(struct atmel_tc *tc) { spin_lock(&tc_list_lock); - if (tc->regs) { - iounmap(tc->regs); - release_mem_region(tc->iomem->start, resource_size(tc->iomem)); - tc->regs = NULL; - tc->iomem = NULL; - } + if (tc->allocated) + tc->allocated = false; spin_unlock(&tc_list_lock); } EXPORT_SYMBOL_GPL(atmel_tc_free); @@ -142,9 +108,7 @@ static int __init tc_probe(struct platform_device *pdev) struct atmel_tc *tc; struct clk *clk; int irq; - - if (!platform_get_resource(pdev, IORESOURCE_MEM, 0)) - return -EINVAL; + struct resource *r; irq = platform_get_irq(pdev, 0); if (irq < 0) @@ -160,12 +124,21 @@ static int __init tc_probe(struct platform_device *pdev) if (IS_ERR(clk)) return PTR_ERR(clk); + r = platform_get_resource(pdev, IORESOURCE_MEM, 0); + tc->regs = devm_ioremap_resource(&pdev->dev, r); + if (IS_ERR(tc->regs)) + return PTR_ERR(tc->regs); + /* Now take SoC information if available */ if (pdev->dev.of_node) { const struct of_device_id *match; match = of_match_node(atmel_tcb_dt_ids, pdev->dev.of_node); if (match) tc->tcb_config = match->data; + + tc->id = of_alias_get_id(tc->pdev->dev.of_node, "tcb"); + } else { + tc->id = pdev->id; } tc->clk[0] = clk; diff --git a/drivers/pwm/pwm-atmel-tcb.c b/drivers/pwm/pwm-atmel-tcb.c index f3dcd02..d56e5b7 100644 --- a/drivers/pwm/pwm-atmel-tcb.c +++ b/drivers/pwm/pwm-atmel-tcb.c @@ -379,7 +379,7 @@ static int atmel_tcb_pwm_probe(struct platform_device *pdev) return err; } - tc = atmel_tc_alloc(tcblock, "tcb-pwm"); + tc = atmel_tc_alloc(tcblock); if (tc == NULL) { dev_err(&pdev->dev, "failed to allocate Timer Counter Block\n"); return -ENOMEM; diff --git a/include/linux/atmel_tc.h b/include/linux/atmel_tc.h index 89a931b..d8aa884 100644 --- a/include/linux/atmel_tc.h +++ b/include/linux/atmel_tc.h @@ -44,12 +44,13 @@ struct atmel_tcb_config { /** * struct atmel_tc - information about a Timer/Counter Block * @pdev: physical device - * @iomem: resource associated with the I/O register * @regs: mapping through which the I/O registers can be accessed + * @id: block id * @tcb_config: configuration data from SoC * @irq: irq for each of the three channels * @clk: internal clock source for each of the three channels * @node: list node, for tclib internal use + * @allocated: if already used, for tclib internal use * * On some platforms, each TC channel has its own clocks and IRQs, * while on others, all TC channels share the same clock and IRQ. @@ -61,15 +62,16 @@ struct atmel_tcb_config { */ struct atmel_tc { struct platform_device *pdev; - struct resource *iomem; void __iomem *regs; + int id; const struct atmel_tcb_config *tcb_config; int irq[3]; struct clk *clk[3]; struct list_head node; + bool allocated; }; -extern struct atmel_tc *atmel_tc_alloc(unsigned block, const char *name); +extern struct atmel_tc *atmel_tc_alloc(unsigned block); extern void atmel_tc_free(struct atmel_tc *tc); /* platform-specific ATMEL_TC_TIMER_CLOCKx divisors (0 means 32KiHz) */