From patchwork Fri Nov 3 14:47:50 2017 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Sudeep Holla X-Patchwork-Id: 117928 Delivered-To: patch@linaro.org Received: by 10.80.245.45 with SMTP id t42csp3404071edm; Fri, 3 Nov 2017 07:51:48 -0700 (PDT) X-Google-Smtp-Source: ABhQp+Q6XzigIM6WpKGZRvAlnGncQUMKfVB5AFI6dfpXa/f38HNm5002h1JTVkH+kjUScPV6SLU/ X-Received: by 10.101.83.201 with SMTP id z9mr7451496pgr.425.1509720708194; Fri, 03 Nov 2017 07:51:48 -0700 (PDT) ARC-Seal: i=1; a=rsa-sha256; t=1509720708; cv=none; d=google.com; s=arc-20160816; b=lsHwVkwL5hx/cPs7L6KxAkBRgKXwZxLiLgDLno3PRO54nkFvHuet5ZPLxPzUYNVdwL 0/Wb9ow1rKYr7ytMQlu/uMTvbrzm4TmLdGhu8wWE3TTSsDH4yX6qJspFuzv3got8wyyp RqNRgzKA3uQ2jyG4MkgQ57YijGAYOirPFmZ2e+pJilXLb5iaQhSjypcqYjOnbyqys4oE 8pOPDG57qnQSAIWx2DgMV7hZgtFjx16EQzjcCsZeRMT2wvQN5D9m2lPTIYXuYp0JIgcD JV2ZJr1HJ/AI7Dg9fqHUS7c6NNnB2UZr1PO3gWrrcx/tkEawSQgpP8ay6k4V88x8ggTn Pa2g== ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=arc-20160816; h=list-id:precedence:sender:references:in-reply-to:message-id:date :subject:cc:to:from:arc-authentication-results; bh=iS2ITxAqssKWeetO3pxvdeqGPXquhSWu9KLmdBY1tvg=; b=WJ0o3x8i473CgPZk4HbCQBKzK1ZQNiEd+uUJkVIdRnxeMuvcf/eNpuLoTMjhtulWcQ 1gqPcfOA0YCRzCs1PGX1QpBmVJF32ALo4TcqBCputdYQz7XEl2xJazt7coaiBdEt38l/ /5z7hkh/J8BRKDoLdXcG8V35REMp4lKknrk0wJbSwII+BSyoo/OEVJeryjKG06jXNGxi uvniBYjrBCyLsCV+mLuw+xqKCVWCfw1UiNSH9N2/pP9hfB9uSONRlaNngSREpsHtB46p 3IJerWYKDLgx9TQMqr9RnX/xnO6hj3RZ/xFM5MT4OnwqDrlS2x9iCL51+aGyroN6VUwY UFFg== ARC-Authentication-Results: i=1; mx.google.com; spf=pass (google.com: best guess record for domain of linux-kernel-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org Return-Path: Received: from vger.kernel.org (vger.kernel.org. [209.132.180.67]) by mx.google.com with ESMTP id k16si6393320pff.411.2017.11.03.07.51.47; Fri, 03 Nov 2017 07:51:48 -0700 (PDT) Received-SPF: pass (google.com: best guess record for domain of linux-kernel-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) client-ip=209.132.180.67; Authentication-Results: mx.google.com; spf=pass (google.com: best guess record for domain of linux-kernel-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S933729AbdKCOvS (ORCPT + 26 others); Fri, 3 Nov 2017 10:51:18 -0400 Received: from usa-sjc-mx-foss1.foss.arm.com ([217.140.101.70]:44422 "EHLO foss.arm.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1755797AbdKCOtT (ORCPT ); Fri, 3 Nov 2017 10:49:19 -0400 Received: from usa-sjc-imap-foss1.foss.arm.com (unknown [10.72.51.249]) by usa-sjc-mx-foss1.foss.arm.com (Postfix) with ESMTP id 13C5D164F; Fri, 3 Nov 2017 07:49:19 -0700 (PDT) Received: from e107155-lin.cambridge.arm.com (e107155-lin.cambridge.arm.com [10.1.210.28]) by usa-sjc-imap-foss1.foss.arm.com (Postfix) with ESMTPA id 24B813F3DF; Fri, 3 Nov 2017 07:49:17 -0700 (PDT) From: Sudeep Holla To: ALKML , LKML , DTML Cc: Sudeep Holla , Roy Franz , Harb Abdulhamid , Nishanth Menon , Arnd Bergmann , Loc Ho , Ryan Harkin , Jassi Brar Subject: [PATCH v4 13/20] firmware: arm_scmi: refactor in preparation to support per-protocol channels Date: Fri, 3 Nov 2017 14:47:50 +0000 Message-Id: <1509720477-18936-14-git-send-email-sudeep.holla@arm.com> X-Mailer: git-send-email 2.7.4 In-Reply-To: <1509720477-18936-1-git-send-email-sudeep.holla@arm.com> References: <1509720477-18936-1-git-send-email-sudeep.holla@arm.com> Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org In order to support per-protocol channels if available, we need to factor out all the mailbox channel information(Tx/Rx payload and channel handle) out of the main SCMI instance information structure. This patch refactors the existing channel information into a separate chan_info structure. Cc: Arnd Bergmann Signed-off-by: Sudeep Holla --- drivers/firmware/arm_scmi/driver.c | 86 ++++++++++++++++++++++++-------------- 1 file changed, 54 insertions(+), 32 deletions(-) -- 2.7.4 diff --git a/drivers/firmware/arm_scmi/driver.c b/drivers/firmware/arm_scmi/driver.c index 0c9dda72f10c..24acb421208c 100644 --- a/drivers/firmware/arm_scmi/driver.c +++ b/drivers/firmware/arm_scmi/driver.c @@ -105,6 +105,22 @@ struct scmi_desc { }; /** + * struct scmi_chan_info - Structure representing a SCMI channel informfation + * + * @cl: Mailbox Client + * @chan: Transmit/Receive mailbox channel + * @payload: Transmit/Receive mailbox channel payload area + * @dev: Reference to device in the SCMI hierarchy corresponding to this + * channel + */ +struct scmi_chan_info { + struct mbox_client cl; + struct mbox_chan *chan; + void __iomem *payload; + struct device *dev; +}; + +/** * struct scmi_info - Structure representing a SCMI instance * * @dev: Device pointer @@ -112,10 +128,8 @@ struct scmi_desc { * @handle: Instance of SCMI handle to send to clients * @version: SCMI revision information containing protocol version, * implementation version and (sub-)vendor identification. - * @cl: Mailbox Client - * @tx_chan: Transmit mailbox channel - * @tx_payload: Transmit mailbox channel payload area * @minfo: Message info + * @tx_cinfo: Reference to SCMI channel information * @protocols_imp: list of protocols implemented, currently maximum of * MAX_PROTOCOLS_IMP elements allocated by the base protocol * @node: list head @@ -126,16 +140,14 @@ struct scmi_info { const struct scmi_desc *desc; struct scmi_revision_info version; struct scmi_handle handle; - struct mbox_client cl; - struct mbox_chan *tx_chan; - void __iomem *tx_payload; struct scmi_xfers_info minfo; + struct scmi_chan_info *tx_cinfo; u8 *protocols_imp; struct list_head node; int users; }; -#define client_to_scmi_info(c) container_of(c, struct scmi_info, cl) +#define client_to_scmi_chan_info(c) container_of(c, struct scmi_chan_info, cl) #define handle_to_scmi_info(h) container_of(h, struct scmi_info, handle) /* @@ -218,10 +230,11 @@ static void scmi_rx_callback(struct mbox_client *cl, void *m) { u16 xfer_id; struct scmi_xfer *xfer; - struct scmi_info *info = client_to_scmi_info(cl); + struct scmi_chan_info *cinfo = client_to_scmi_chan_info(cl); + struct device *dev = cinfo->dev; + struct scmi_info *info = dev_get_drvdata(dev); struct scmi_xfers_info *minfo = &info->minfo; - struct device *dev = info->dev; - struct scmi_shared_mem __iomem *mem = info->tx_payload; + struct scmi_shared_mem __iomem *mem = cinfo->payload; xfer_id = MSG_XTRACT_TOKEN(ioread32(&mem->msg_header)); @@ -272,8 +285,8 @@ static inline u32 pack_scmi_header(struct scmi_msg_hdr *hdr) static void scmi_tx_prepare(struct mbox_client *cl, void *m) { struct scmi_xfer *t = m; - struct scmi_info *info = client_to_scmi_info(cl); - struct scmi_shared_mem __iomem *mem = info->tx_payload; + struct scmi_chan_info *cinfo = client_to_scmi_chan_info(cl); + struct scmi_shared_mem __iomem *mem = cinfo->payload; /* Mark channel busy + clear error */ iowrite32(0x0, &mem->channel_status); @@ -366,15 +379,15 @@ void scmi_one_xfer_put(const struct scmi_handle *handle, struct scmi_xfer *xfer) } static bool -scmi_xfer_poll_done(const struct scmi_info *info, struct scmi_xfer *xfer) +scmi_xfer_poll_done(const struct scmi_chan_info *cinfo, struct scmi_xfer *xfer) { - struct scmi_shared_mem *mem = info->tx_payload; - u16 xfer_id = MSG_XTRACT_TOKEN(le32_to_cpu(mem->msg_header)); + struct scmi_shared_mem __iomem *mem = cinfo->payload; + u16 xfer_id = MSG_XTRACT_TOKEN(ioread32(&mem->msg_header)); if (xfer->hdr.seq != xfer_id) return false; - return le32_to_cpu(mem->channel_status) & + return ioread32(&mem->channel_status) & (SCMI_SHMEM_CHAN_STAT_CHANNEL_ERROR | SCMI_SHMEM_CHAN_STAT_CHANNEL_FREE); } @@ -396,8 +409,9 @@ int scmi_do_xfer(const struct scmi_handle *handle, struct scmi_xfer *xfer) int timeout; struct scmi_info *info = handle_to_scmi_info(handle); struct device *dev = info->dev; + struct scmi_chan_info *cinfo = info->tx_cinfo; - ret = mbox_send_message(info->tx_chan, xfer); + ret = mbox_send_message(cinfo->chan, xfer); if (ret < 0) { dev_dbg(dev, "mbox send fail %d\n", ret); return ret; @@ -413,11 +427,11 @@ int scmi_do_xfer(const struct scmi_handle *handle, struct scmi_xfer *xfer) do { udelay(5); cur = ktime_get(); - } while (!scmi_xfer_poll_done(info, xfer) && + } while (!scmi_xfer_poll_done(cinfo, xfer) && ktime_before(cur, stop)); if (ktime_before(cur, stop)) - scmi_fetch_response(xfer, info->tx_payload); + scmi_fetch_response(xfer, cinfo->payload); else ret = -ETIMEDOUT; } else { @@ -437,7 +451,7 @@ int scmi_do_xfer(const struct scmi_handle *handle, struct scmi_xfer *xfer) * Unfortunately, we have to kick the mailbox framework after we have * received our message. */ - mbox_client_txdone(info->tx_chan, ret); + mbox_client_txdone(cinfo->chan, ret); return ret; } @@ -667,11 +681,11 @@ static int scmi_mailbox_check(struct device_node *np) return of_parse_phandle_with_args(np, "mboxes", "#mbox-cells", 0, &arg); } -static int scmi_mbox_free_channel(struct scmi_info *info) +static int scmi_mbox_free_channel(struct scmi_chan_info *cinfo) { - if (!IS_ERR_OR_NULL(info->tx_chan)) { - mbox_free_channel(info->tx_chan); - info->tx_chan = NULL; + if (!IS_ERR_OR_NULL(cinfo->chan)) { + mbox_free_channel(cinfo->chan); + cinfo->chan = NULL; } return 0; @@ -691,7 +705,7 @@ static int scmi_remove(struct platform_device *pdev) if (!ret) /* Safe to free channels since no more users */ - return scmi_mbox_free_channel(info); + return scmi_mbox_free_channel(info->tx_cinfo); return ret; } @@ -703,9 +717,17 @@ static inline int scmi_mbox_chan_setup(struct scmi_info *info) resource_size_t size; struct device *dev = info->dev; struct device_node *shmem, *np = dev->of_node; + struct scmi_chan_info *cinfo; struct mbox_client *cl; - cl = &info->cl; + cinfo = devm_kzalloc(info->dev, sizeof(*cinfo), GFP_KERNEL); + if (!cinfo) + return -ENOMEM; + + info->tx_cinfo = cinfo; + cinfo->dev = dev; + + cl = &cinfo->cl; cl->dev = dev; cl->rx_callback = scmi_rx_callback; cl->tx_prepare = scmi_tx_prepare; @@ -721,16 +743,16 @@ static inline int scmi_mbox_chan_setup(struct scmi_info *info) } size = resource_size(&res); - info->tx_payload = devm_ioremap(dev, res.start, size); - if (!info->tx_payload) { + cinfo->payload = devm_ioremap(info->dev, res.start, size); + if (!cinfo->payload) { dev_err(dev, "failed to ioremap SCMI Tx payload\n"); return -EADDRNOTAVAIL; } /* Transmit channel is first entry i.e. index 0 */ - info->tx_chan = mbox_request_channel(cl, 0); - if (IS_ERR(info->tx_chan)) { - ret = PTR_ERR(info->tx_chan); + cinfo->chan = mbox_request_channel(cl, 0); + if (IS_ERR(cinfo->chan)) { + ret = PTR_ERR(cinfo->chan); if (ret != -EPROBE_DEFER) dev_err(dev, "failed to request SCMI Tx mailbox\n"); return ret; @@ -798,7 +820,7 @@ static int scmi_probe(struct platform_device *pdev) ret = scmi_base_protocol_init(handle); if (ret) { dev_err(dev, "unable to communicate with SCMI(%d)\n", ret); - scmi_mbox_free_channel(info); + scmi_mbox_free_channel(info->tx_cinfo); return ret; }