From patchwork Thu May 29 14:05:58 2014 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Alex Elder X-Patchwork-Id: 4264941 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 DCE99BF90B for ; Thu, 29 May 2014 14:08:53 +0000 (UTC) Received: from mail.kernel.org (localhost [127.0.0.1]) by mail.kernel.org (Postfix) with ESMTP id F26A0202DD for ; Thu, 29 May 2014 14:08:52 +0000 (UTC) Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.9]) (using TLSv1.2 with cipher DHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id 17AE82022A for ; Thu, 29 May 2014 14:08:52 +0000 (UTC) Received: from localhost ([127.0.0.1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.80.1 #2 (Red Hat Linux)) id 1Wq0yt-0005rA-2u; Thu, 29 May 2014 14:06:55 +0000 Received: from mail-ig0-f182.google.com ([209.85.213.182]) by bombadil.infradead.org with esmtps (Exim 4.80.1 #2 (Red Hat Linux)) id 1Wq0yQ-0005Rx-Qn for linux-arm-kernel@lists.infradead.org; Thu, 29 May 2014 14:06:27 +0000 Received: by mail-ig0-f182.google.com with SMTP id uy17so389064igb.3 for ; Thu, 29 May 2014 07:06:05 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20130820; h=x-gm-message-state:from:to:cc:subject:date:message-id:in-reply-to :references; bh=RyB2dQwln2E7cq0D8wQyPoSdNxPCq1LtJFy/8Tso8NE=; b=e0dMQraQKe5uiMYFaDmC8d/gsVncRAKJf0APigUy8IsKTmONK71PqVdgzo/29VyP1j OK3+MoUkqkPt6EiWoGkSpmlEIYGSqU8grF5x5IyLBTOmfPtWS9kJip6IMwh19yfbSrfS mPgHiFlbw9getet0RZMitbqKB0HHlmtpC+CWz4TMhqjV9LiP1oxXgDE0r25EVOiGlRc2 tUDpXYRGRlnLiJp/sjjdytovfZEqJSSy2yIW+pjd2lynYCmLUQRaXhze39r6nms/7J8a dQbvefcEvRInZl7G8Yk4doUb8ZpR6YHil0jUYXfwL/6o7ru9eBNpECLHv0tMAXDdm5VY xHGQ== X-Gm-Message-State: ALoCoQnoM14JEUpVO9juMj81uZSGwR6XONCXHi9cPbU+HjMLqtu8o4VrAsPiE2boZfkYQ8EZokzt X-Received: by 10.50.79.195 with SMTP id l3mr10951030igx.36.1401372365803; Thu, 29 May 2014 07:06:05 -0700 (PDT) Received: from localhost.localdomain (c-71-195-31-37.hsd1.mn.comcast.net. [71.195.31.37]) by mx.google.com with ESMTPSA id ng17sm2510130igb.13.2014.05.29.07.06.04 for (version=TLSv1.2 cipher=ECDHE-RSA-AES128-SHA bits=128/128); Thu, 29 May 2014 07:06:05 -0700 (PDT) From: Alex Elder To: mturquette@linaro.org, mporter@linaro.org, bcm@fixthebug.org Subject: [PATCH v3 2/5] clk: bcm281xx: implement prerequisite clocks Date: Thu, 29 May 2014 09:05:58 -0500 Message-Id: <1401372361-18842-3-git-send-email-elder@linaro.org> X-Mailer: git-send-email 1.9.1 In-Reply-To: <1401372361-18842-1-git-send-email-elder@linaro.org> References: <1401372361-18842-1-git-send-email-elder@linaro.org> X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20140529_070626_906779_B78AD9C8 X-CRM114-Status: GOOD ( 16.47 ) X-Spam-Score: -0.7 (/) Cc: linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org 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=-2.5 required=5.0 tests=BAYES_00,RP_MATCHES_RCVD, 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 Allow a clock to specify a "prerequisite" clock. The prerequisite clock must be initialized before the clock that depends on it. A prerequisite clock is defined initially by its name; as that clock gets initialized the name gets replaced with a pointer to its clock structure pointer. Rework the KONA_CLK() macro, and define a new KONA_CLK_PREREQ() variant that allows a prerequisite clock to be specified. There exist clocks that could specify more than one prequisite, but almost all clocks only ever use one. We can add support for more than one if we find we need it at some point. Signed-off-by: Alex Elder --- drivers/clk/bcm/clk-kona.c | 45 +++++++++++++++++++++++++++++++++++++++++++++ drivers/clk/bcm/clk-kona.h | 19 ++++++++++++++++--- 2 files changed, 61 insertions(+), 3 deletions(-) diff --git a/drivers/clk/bcm/clk-kona.c b/drivers/clk/bcm/clk-kona.c index 9691b62..d08b3e9 100644 --- a/drivers/clk/bcm/clk-kona.c +++ b/drivers/clk/bcm/clk-kona.c @@ -1247,6 +1247,48 @@ static bool __peri_clk_init(struct kona_clk *bcm_clk) return true; } +static bool __kona_clk_init(struct kona_clk *bcm_clk); +static bool __kona_prereq_init(struct kona_clk *bcm_clk) +{ + struct clk *clk; + struct clk_hw *hw; + struct kona_clk *prereq; + + BUG_ON(clk_is_initialized(bcm_clk)); + + if (!bcm_clk->p.prereq) + return true; + + clk = clk_get(NULL, bcm_clk->p.prereq); + if (IS_ERR(clk)) { + pr_err("%s: unable to get prereq clock %s for %s\n", + __func__, bcm_clk->p.prereq, bcm_clk->init_data.name); + return false; + } + hw = __clk_get_hw(clk); + if (!hw) { + pr_err("%s: null hw pointer for clock %s\n", __func__, + bcm_clk->init_data.name); + return false; + } + prereq = to_kona_clk(hw); + if (prereq->ccu != bcm_clk->ccu) { + pr_err("%s: prereq clock %s CCU different for clock %s\n", + __func__, bcm_clk->p.prereq, bcm_clk->init_data.name); + return false; + } + + /* Initialize the prerequisite clock first */ + if (!__kona_clk_init(prereq)) { + pr_err("%s: failed to init prereq %s for clock %s\n", + __func__, bcm_clk->p.prereq, bcm_clk->init_data.name); + return false; + } + bcm_clk->p.prereq_clk = clk; + + return true; +} + static bool __kona_clk_init(struct kona_clk *bcm_clk) { bool ret; @@ -1254,6 +1296,9 @@ static bool __kona_clk_init(struct kona_clk *bcm_clk) if (clk_is_initialized(bcm_clk)) return true; + if (!__kona_prereq_init(bcm_clk)) + return false; + switch (bcm_clk->type) { case bcm_clk_peri: ret = __peri_clk_init(bcm_clk); diff --git a/drivers/clk/bcm/clk-kona.h b/drivers/clk/bcm/clk-kona.h index 10e238d..be00767 100644 --- a/drivers/clk/bcm/clk-kona.h +++ b/drivers/clk/bcm/clk-kona.h @@ -22,6 +22,8 @@ #include #include #include +#include +#include #define BILLION 1000000000 @@ -408,6 +410,10 @@ struct kona_clk { enum bcm_clk_type type; u32 flags; /* BCM_CLK_KONA_FLAGS_* below */ union { + const char *prereq; + struct clk *prereq_clk; + } p; + union { void *data; struct peri_clk_data *peri; } u; @@ -422,15 +428,22 @@ struct kona_clk { #define BCM_CLK_KONA_FLAGS_INITIALIZED ((u32)1 << 0) /* Clock initialized */ /* Initialization macro for an entry in a CCU's kona_clks[] array. */ -#define KONA_CLK(_ccu_name, _clk_name, _type) \ - { \ +#define ___KONA_CLK_COMMON(_ccu_name, _clk_name, _type) \ .init_data = { \ .name = #_clk_name, \ .ops = &kona_ ## _type ## _clk_ops, \ }, \ .ccu = &_ccu_name ## _ccu_data, \ .type = bcm_clk_ ## _type, \ - .u.data = &_clk_name ## _data, \ + .u.data = &_clk_name ## _data +#define KONA_CLK_PREREQ(_ccu_name, _clk_name, _type, _prereq) \ + { \ + .p.prereq = #_prereq, \ + ___KONA_CLK_COMMON(_ccu_name, _clk_name, _type), \ + } +#define KONA_CLK(_ccu_name, _clk_name, _type) \ + { \ + ___KONA_CLK_COMMON(_ccu_name, _clk_name, _type), \ } #define LAST_KONA_CLK { .type = bcm_clk_none }