From patchwork Fri Nov 22 16:22:42 2013 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Lee Jones X-Patchwork-Id: 21685 Return-Path: X-Original-To: linaro@patches.linaro.org Delivered-To: linaro@patches.linaro.org Received: from mail-oa0-f70.google.com (mail-oa0-f70.google.com [209.85.219.70]) by ip-10-151-82-157.ec2.internal (Postfix) with ESMTPS id E470623FDC for ; Fri, 22 Nov 2013 16:23:34 +0000 (UTC) Received: by mail-oa0-f70.google.com with SMTP id m1sf4553218oag.1 for ; Fri, 22 Nov 2013 08:23:34 -0800 (PST) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20130820; h=x-gm-message-state:mime-version:delivered-to:from:to:cc:subject :date:message-id:in-reply-to:references:x-original-sender :x-original-authentication-results:precedence:mailing-list:list-id :list-post:list-help:list-archive:list-unsubscribe; bh=UxEm3WVtjfzXwUevvOIBjK8jjZBQXq56zwiECvZgNRk=; b=gNNvpUPsw9F/XJCt8/SSEDTj7tcsN3md8m875PcycLR4OXSp3tHDeooTc9oy/dgvry YwiPnzNWsnwfeRdOqu2eBIR/G0spEoZcgNj9RKXGFi5lpB2OIwuer0rNWCFJTrqGmhRP DBnawtHBp+8cKmT4LlRiXfQYL0VWyroRTa6ifw2F/CIkW7T4MP5ikq3M3uF9jVnUHmcb cx/A5XPI4eZoNlTIv+WUfJRj5126TLjsfU6HJURJzoZaGqAEP5LuCUrQmJxONcbrgB7O P/0cIJCXk0RICYExo27gOGCgWVTTzNTtEQ9HPZZ7CUQ+yQAhk5uAL5k7FOaZGFuhno5O 1c2g== X-Gm-Message-State: ALoCoQlkBncBZP3/YLE5fCC8U19nOB7r75q21QAyOw3oU4fxqYLcazxiY3+uyitXOCRUrqxsgx4i X-Received: by 10.182.186.73 with SMTP id fi9mr423783obc.48.1385137414266; Fri, 22 Nov 2013 08:23:34 -0800 (PST) MIME-Version: 1.0 X-BeenThere: patchwork-forward@linaro.org Received: by 10.49.26.227 with SMTP id o3ls1030473qeg.5.gmail; Fri, 22 Nov 2013 08:23:34 -0800 (PST) X-Received: by 10.220.64.69 with SMTP id d5mr12247834vci.11.1385137414153; Fri, 22 Nov 2013 08:23:34 -0800 (PST) Received: from mail-vb0-f51.google.com (mail-vb0-f51.google.com [209.85.212.51]) by mx.google.com with ESMTPS id o6si12901953vcz.4.2013.11.22.08.23.34 for (version=TLSv1 cipher=ECDHE-RSA-RC4-SHA bits=128/128); Fri, 22 Nov 2013 08:23:34 -0800 (PST) Received-SPF: neutral (google.com: 209.85.212.51 is neither permitted nor denied by best guess record for domain of patch+caf_=patchwork-forward=linaro.org@linaro.org) client-ip=209.85.212.51; Received: by mail-vb0-f51.google.com with SMTP id m10so1005013vbh.24 for ; Fri, 22 Nov 2013 08:23:34 -0800 (PST) X-Received: by 10.58.143.17 with SMTP id sa17mr12277145veb.14.1385137414074; Fri, 22 Nov 2013 08:23:34 -0800 (PST) X-Forwarded-To: patchwork-forward@linaro.org X-Forwarded-For: patch@linaro.org patchwork-forward@linaro.org Delivered-To: patches@linaro.org Received: by 10.220.174.196 with SMTP id u4csp51495vcz; Fri, 22 Nov 2013 08:23:33 -0800 (PST) X-Received: by 10.68.170.66 with SMTP id ak2mr12704178pbc.5.1385137413252; Fri, 22 Nov 2013 08:23:33 -0800 (PST) Received: from mail-pd0-f174.google.com (mail-pd0-f174.google.com [209.85.192.174]) by mx.google.com with ESMTPS id t5si95555pab.24.2013.11.22.08.23.32 for (version=TLSv1 cipher=ECDHE-RSA-RC4-SHA bits=128/128); Fri, 22 Nov 2013 08:23:33 -0800 (PST) Received-SPF: neutral (google.com: 209.85.192.174 is neither permitted nor denied by best guess record for domain of lee.jones@linaro.org) client-ip=209.85.192.174; Received: by mail-pd0-f174.google.com with SMTP id y13so1452097pdi.19 for ; Fri, 22 Nov 2013 08:23:32 -0800 (PST) X-Received: by 10.68.89.162 with SMTP id bp2mr3606769pbb.151.1385137412818; Fri, 22 Nov 2013 08:23:32 -0800 (PST) Received: from localhost.localdomain (cpc15-aztw25-2-0-cust493.aztw.cable.virginm.net. [92.233.57.238]) by mx.google.com with ESMTPSA id qz9sm52962938pbc.3.2013.11.22.08.23.30 for (version=TLSv1.1 cipher=ECDHE-RSA-RC4-SHA bits=128/128); Fri, 22 Nov 2013 08:23:32 -0800 (PST) From: Lee Jones To: linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, dwmw2@infradead.org, linux-mtd@lists.infradead.org, angus.clark@st.com Cc: linus.walleij@linaro.org, Lee Jones Subject: [PATCH 05/23] mtd: st_spi_fsm: Supply a method to read from the FSM's FIFO Date: Fri, 22 Nov 2013 16:22:42 +0000 Message-Id: <1385137380-28968-6-git-send-email-lee.jones@linaro.org> X-Mailer: git-send-email 1.8.1.2 In-Reply-To: <1385137380-28968-1-git-send-email-lee.jones@linaro.org> References: <1385137380-28968-1-git-send-email-lee.jones@linaro.org> X-Removed-Original-Auth: Dkim didn't pass. X-Original-Sender: lee.jones@linaro.org X-Original-Authentication-Results: mx.google.com; spf=neutral (google.com: 209.85.212.51 is neither permitted nor denied by best guess record for domain of patch+caf_=patchwork-forward=linaro.org@linaro.org) smtp.mail=patch+caf_=patchwork-forward=linaro.org@linaro.org Precedence: list Mailing-list: list patchwork-forward@linaro.org; contact patchwork-forward+owners@linaro.org List-ID: X-Google-Group-Id: 836684582541 List-Post: , List-Help: , List-Archive: List-Unsubscribe: , When invoked the driver will attempt to read any available data from the FSM's data register. Any data collected from this FIFO would have originated from the flash chip. Signed-off-by: Lee Jones --- drivers/mtd/devices/st_spi_fsm.c | 26 ++++++++++++++++++++++++++ 1 file changed, 26 insertions(+) diff --git a/drivers/mtd/devices/st_spi_fsm.c b/drivers/mtd/devices/st_spi_fsm.c index e671029..73c55b4 100644 --- a/drivers/mtd/devices/st_spi_fsm.c +++ b/drivers/mtd/devices/st_spi_fsm.c @@ -65,6 +65,32 @@ static void stfsm_wait_seq(struct stfsm *fsm) dev_err(fsm->dev, "timeout on sequence completion\n"); } +static void stfsm_read_fifo(struct stfsm *fsm, uint32_t *buf, + const uint32_t size) +{ + uint32_t remaining = size >> 2; + uint32_t avail; + uint32_t words; + + dev_dbg(fsm->dev, "Reading %d bytes from FIFO\n", size); + + BUG_ON((((uint32_t)buf) & 0x3) || (size & 0x3)); + + while (remaining) { + for (;;) { + avail = stfsm_fifo_available(fsm); + if (avail) + break; + udelay(1); + } + words = min(avail, remaining); + remaining -= words; + + readsl(fsm->base + SPI_FAST_SEQ_DATA_REG, buf, words); + buf += words; + } +} + static void stfsm_clear_fifo(struct stfsm *fsm) { uint32_t avail;