From mboxrd@z Thu Jan 1 00:00:00 1970 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=-9.8 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_PATCH,MAILING_LIST_MULTI,SIGNED_OFF_BY,SPF_HELO_NONE,SPF_PASS, USER_AGENT_GIT autolearn=ham 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 22E15C76190 for ; Thu, 25 Jul 2019 23:43:49 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 00ED5229F9 for ; Thu, 25 Jul 2019 23:43:49 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727878AbfGYXnr (ORCPT ); Thu, 25 Jul 2019 19:43:47 -0400 Received: from mga06.intel.com ([134.134.136.31]:51808 "EHLO mga06.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1727070AbfGYXlD (ORCPT ); Thu, 25 Jul 2019 19:41:03 -0400 X-Amp-Result: SKIPPED(no attachment in message) X-Amp-File-Uploaded: False Received: from fmsmga006.fm.intel.com ([10.253.24.20]) by orsmga104.jf.intel.com with ESMTP/TLS/DHE-RSA-AES256-GCM-SHA384; 25 Jul 2019 16:41:02 -0700 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.64,308,1559545200"; d="scan'208";a="369874640" Received: from amrutaku-mobl1.amr.corp.intel.com (HELO pbossart-mobl3.intel.com) ([10.255.230.75]) by fmsmga006.fm.intel.com with ESMTP; 25 Jul 2019 16:41:01 -0700 From: Pierre-Louis Bossart To: alsa-devel@alsa-project.org Cc: linux-kernel@vger.kernel.org, tiwai@suse.de, broonie@kernel.org, vkoul@kernel.org, gregkh@linuxfoundation.org, jank@cadence.com, srinivas.kandagatla@linaro.org, slawomir.blauciak@intel.com, Pierre-Louis Bossart , Sanyog Kale Subject: [RFC PATCH 02/40] soundwire: cadence_master: add debugfs register dump Date: Thu, 25 Jul 2019 18:39:54 -0500 Message-Id: <20190725234032.21152-3-pierre-louis.bossart@linux.intel.com> X-Mailer: git-send-email 2.20.1 In-Reply-To: <20190725234032.21152-1-pierre-louis.bossart@linux.intel.com> References: <20190725234032.21152-1-pierre-louis.bossart@linux.intel.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Add debugfs file to dump the Cadence master registers Credits: this patch is based on an earlier internal contribution by Vinod Koul, Sanyog Kale, Shreyas Nc and Hardik Shah. The main change is the use of scnprintf to avoid known issues with snprintf. Signed-off-by: Pierre-Louis Bossart --- drivers/soundwire/cadence_master.c | 98 ++++++++++++++++++++++++++++++ drivers/soundwire/cadence_master.h | 2 + 2 files changed, 100 insertions(+) diff --git a/drivers/soundwire/cadence_master.c b/drivers/soundwire/cadence_master.c index ff4badc9b3de..91e8bacb83e3 100644 --- a/drivers/soundwire/cadence_master.c +++ b/drivers/soundwire/cadence_master.c @@ -8,6 +8,7 @@ #include #include +#include #include #include #include @@ -223,6 +224,103 @@ static int cdns_clear_bit(struct sdw_cdns *cdns, int offset, u32 value) return -EAGAIN; } +/* + * debugfs + */ + +#define RD_BUF (2 * PAGE_SIZE) + +static ssize_t cdns_sprintf(struct sdw_cdns *cdns, + char *buf, size_t pos, unsigned int reg) +{ + return scnprintf(buf + pos, RD_BUF - pos, + "%4x\t%4x\n", reg, cdns_readl(cdns, reg)); +} + +static ssize_t cdns_reg_read(struct file *file, char __user *user_buf, + size_t count, loff_t *ppos) +{ + struct sdw_cdns *cdns = file->private_data; + char *buf; + ssize_t ret; + int i, j; + + buf = kzalloc(RD_BUF, GFP_KERNEL); + if (!buf) + return -ENOMEM; + + ret = scnprintf(buf, RD_BUF, "Register Value\n"); + ret += scnprintf(buf + ret, RD_BUF - ret, "\nMCP Registers\n"); + for (i = 0; i < 8; i++) /* 8 MCP registers */ + ret += cdns_sprintf(cdns, buf, ret, i * 4); + + ret += scnprintf(buf + ret, RD_BUF - ret, + "\nStatus & Intr Registers\n"); + for (i = 0; i < 13; i++) /* 13 Status & Intr registers */ + ret += cdns_sprintf(cdns, buf, ret, CDNS_MCP_STAT + i * 4); + + ret += scnprintf(buf + ret, RD_BUF - ret, + "\nSSP & Clk ctrl Registers\n"); + ret += cdns_sprintf(cdns, buf, ret, CDNS_MCP_SSP_CTRL0); + ret += cdns_sprintf(cdns, buf, ret, CDNS_MCP_SSP_CTRL1); + ret += cdns_sprintf(cdns, buf, ret, CDNS_MCP_CLK_CTRL0); + ret += cdns_sprintf(cdns, buf, ret, CDNS_MCP_CLK_CTRL1); + + ret += scnprintf(buf + ret, RD_BUF - ret, + "\nDPn B0 Registers\n"); + for (i = 0; i < 7; i++) { + ret += scnprintf(buf + ret, RD_BUF - ret, + "\nDP-%d\n", i); + for (j = 0; j < 6; j++) + ret += cdns_sprintf(cdns, buf, ret, + CDNS_DPN_B0_CONFIG(i) + j * 4); + } + + ret += scnprintf(buf + ret, RD_BUF - ret, + "\nDPn B1 Registers\n"); + for (i = 0; i < 7; i++) { + ret += scnprintf(buf + ret, RD_BUF - ret, + "\nDP-%d\n", i); + + for (j = 0; j < 6; j++) + ret += cdns_sprintf(cdns, buf, ret, + CDNS_DPN_B1_CONFIG(i) + j * 4); + } + + ret += scnprintf(buf + ret, RD_BUF - ret, + "\nDPn Control Registers\n"); + for (i = 0; i < 7; i++) + ret += cdns_sprintf(cdns, buf, ret, + CDNS_PORTCTRL + i * CDNS_PORT_OFFSET); + + ret += scnprintf(buf + ret, RD_BUF - ret, + "\nPDIn Config Registers\n"); + for (i = 0; i < 7; i++) + ret += cdns_sprintf(cdns, buf, ret, CDNS_PDI_CONFIG(i)); + + ret = simple_read_from_buffer(user_buf, count, ppos, buf, ret); + kfree(buf); + + return ret; +} + +static const struct file_operations cdns_reg_fops = { + .open = simple_open, + .read = cdns_reg_read, + .llseek = default_llseek, +}; + +/** + * sdw_cdns_debugfs_init() - Cadence debugfs init + * @cdns: Cadence instance + * @root: debugfs root + */ +void sdw_cdns_debugfs_init(struct sdw_cdns *cdns, struct dentry *root) +{ + debugfs_create_file("cdns-registers", 0400, root, cdns, &cdns_reg_fops); +} +EXPORT_SYMBOL_GPL(sdw_cdns_debugfs_init); + /* * IO Calls */ diff --git a/drivers/soundwire/cadence_master.h b/drivers/soundwire/cadence_master.h index fe2af62958b1..c0bf6ff00a44 100644 --- a/drivers/soundwire/cadence_master.h +++ b/drivers/soundwire/cadence_master.h @@ -163,6 +163,8 @@ int sdw_cdns_pdi_init(struct sdw_cdns *cdns, struct sdw_cdns_stream_config config); int sdw_cdns_enable_interrupt(struct sdw_cdns *cdns); +void sdw_cdns_debugfs_init(struct sdw_cdns *cdns, struct dentry *root); + int sdw_cdns_get_stream(struct sdw_cdns *cdns, struct sdw_cdns_streams *stream, u32 ch, u32 dir); -- 2.20.1