From patchwork Mon Sep 20 16:11:23 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Patchwork-Submitter: =?utf-8?b?SsOpcsO0bWUgUG91aWxsZXI=?= X-Patchwork-Id: 12505925 X-Patchwork-Delegate: kuba@kernel.org 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=-16.7 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI,MSGID_FROM_MTA_HEADER,SPF_HELO_NONE,SPF_PASS, USER_AGENT_GIT autolearn=unavailable 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 62D73C433EF for ; Mon, 20 Sep 2021 16:14:35 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 4D9F760F70 for ; Mon, 20 Sep 2021 16:14:35 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S243553AbhITQQA (ORCPT ); Mon, 20 Sep 2021 12:16:00 -0400 Received: from mail-bn7nam10on2055.outbound.protection.outlook.com ([40.107.92.55]:31296 "EHLO NAM10-BN7-obe.outbound.protection.outlook.com" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S242382AbhITQOP (ORCPT ); Mon, 20 Sep 2021 12:14:15 -0400 ARC-Seal: i=1; a=rsa-sha256; s=arcselector9901; d=microsoft.com; cv=none; b=OzGcdXR8/fALP3nQjZkrG/BKVLDWGKFDBCQi1oSTTiMiSaVAVE1p4q7JzZprVzaywgJE9B9Nyi7I1lMXayiqUY1gssZY+DeND+VTmxdqHHg7PaqQj8SxR79ESp1Jzha7e1wAtkIzuJez3tBPeOQlg+qL2OJ0a3F1VKkEHpVIh7kYSsj5dfMS0VzTyUDAgX47UAQtA8diyxFBPpXTZrQQUWk4fGQxwueJgPOYJI/jvWqAnw5K9tjktW6cvaj4n47+2469jSxey9Qo1qsf7xNuC5Ade2N1zBNVI1WnwvgF/mEiO2YPRJiTeOlZtpWnPRZ8CXCiLwmew+W4gIGl7qXbWg== ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=microsoft.com; s=arcselector9901; h=From:Date:Subject:Message-ID:Content-Type:MIME-Version; bh=lquym0q6CMbsfLPbe1AK9mls78xc1jS4/BFzqXVswKE=; b=eEtVkaX7X7vrpn9NGwuBVHw+bQSpHuZIvV8RzVgnCj4rgvINmGFqm1XERxGgm3wOnurhoKgzRiVl5B26+dDSe9XGKNMXXi4mnJumHcvEMUb8J8vg2ICc5AA9ZGj4fyRat9AICyfhGvFNO413sYvZVsfIlAjy+i9W5164AJDuw/blVvdq0RqBIbCDijtpt5SXejlMZQscTEE1v6+jLOEBJiUALW68Gsk4rnOjhgTAMrjvU/M6MHhURi3ofZAPpURLdg9tLZmZ8yl+4G0soR25KAAiO0so6MKVK1WHS67/IEK/xRJuYX5kHGbScgx228vdXXaYH870alGk74dlLqGb5Q== ARC-Authentication-Results: i=1; mx.microsoft.com 1; spf=pass smtp.mailfrom=silabs.com; dmarc=pass action=none header.from=silabs.com; dkim=pass header.d=silabs.com; arc=none DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=silabs.onmicrosoft.com; s=selector2-silabs-onmicrosoft-com; h=From:Date:Subject:Message-ID:Content-Type:MIME-Version:X-MS-Exchange-SenderADCheck; bh=lquym0q6CMbsfLPbe1AK9mls78xc1jS4/BFzqXVswKE=; b=H0/hBmwCAf4URiYlYN5RHm45k1VXmW8o/IA9eYtRWEkrhb7AWeHQXQ/SsE/beQRyBtrGM+nQsdmfx422nKP08FO4l/N7YJaXLeykmbwzrxYD+oXFWIi2r+u/GoWoLRAEf25A/0t/zbUuNVmAjrq6Hq3K/Hi7307AljhqdaTXEu0= Authentication-Results: vger.kernel.org; dkim=none (message not signed) header.d=none;vger.kernel.org; dmarc=none action=none header.from=silabs.com; Received: from SN6PR11MB2718.namprd11.prod.outlook.com (2603:10b6:805:63::18) by SA2PR11MB5002.namprd11.prod.outlook.com (2603:10b6:806:fb::8) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.4523.16; Mon, 20 Sep 2021 16:12:20 +0000 Received: from SN6PR11MB2718.namprd11.prod.outlook.com ([fe80::7050:a0a:415:2ccd]) by SN6PR11MB2718.namprd11.prod.outlook.com ([fe80::7050:a0a:415:2ccd%7]) with mapi id 15.20.4523.018; Mon, 20 Sep 2021 16:12:20 +0000 From: Jerome Pouiller To: linux-wireless@vger.kernel.org, netdev@vger.kernel.org, Kalle Valo Cc: devel@driverdev.osuosl.org, linux-kernel@vger.kernel.org, Greg Kroah-Hartman , "David S . Miller" , devicetree@vger.kernel.org, Rob Herring , linux-mmc@vger.kernel.org, =?utf-8?q?Pali?= =?utf-8?q?_Roh=C3=A1r?= , Ulf Hansson , =?utf-8?b?SsOpcsO0bWUgUG91aWxsZXI=?= Subject: [PATCH v7 11/24] wfx: add bh.c/bh.h Date: Mon, 20 Sep 2021 18:11:23 +0200 Message-Id: <20210920161136.2398632-12-Jerome.Pouiller@silabs.com> X-Mailer: git-send-email 2.33.0 In-Reply-To: <20210920161136.2398632-1-Jerome.Pouiller@silabs.com> References: <20210920161136.2398632-1-Jerome.Pouiller@silabs.com> X-ClientProxiedBy: SA0PR11CA0064.namprd11.prod.outlook.com (2603:10b6:806:d2::9) To SN6PR11MB2718.namprd11.prod.outlook.com (2603:10b6:805:63::18) MIME-Version: 1.0 Received: from pc-42.silabs.com (2a01:e34:ecb5:66a0:9876:e1d7:65be:d294) by SA0PR11CA0064.namprd11.prod.outlook.com (2603:10b6:806:d2::9) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.4523.14 via Frontend Transport; Mon, 20 Sep 2021 16:12:18 +0000 X-MS-PublicTrafficType: Email X-MS-Office365-Filtering-Correlation-Id: c624894b-ec7c-4c29-f81c-08d97c516c40 X-MS-TrafficTypeDiagnostic: SA2PR11MB5002: X-MS-Exchange-Transport-Forked: True X-Microsoft-Antispam-PRVS: X-MS-Oob-TLC-OOBClassifiers: OLM:9508; X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0; X-Microsoft-Antispam-Message-Info: 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 X-Forefront-Antispam-Report: CIP:255.255.255.255;CTRY:;LANG:en;SCL:1;SRV:;IPV:NLI;SFV:NSPM;H:SN6PR11MB2718.namprd11.prod.outlook.com;PTR:;CAT:NONE;SFS:(366004)(66476007)(36756003)(2616005)(66556008)(107886003)(186003)(54906003)(5660300002)(6486002)(66574015)(66946007)(52116002)(38100700002)(83380400001)(7696005)(6916009)(2906002)(1076003)(4326008)(8936002)(316002)(8676002)(508600001)(86362001)(30864003)(6666004)(7416002);DIR:OUT;SFP:1101; X-MS-Exchange-AntiSpam-MessageData-ChunkCount: 1 X-MS-Exchange-AntiSpam-MessageData-0: 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 X-OriginatorOrg: silabs.com X-MS-Exchange-CrossTenant-Network-Message-Id: c624894b-ec7c-4c29-f81c-08d97c516c40 X-MS-Exchange-CrossTenant-AuthSource: SN6PR11MB2718.namprd11.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Internal X-MS-Exchange-CrossTenant-OriginalArrivalTime: 20 Sep 2021 16:12:20.2786 (UTC) X-MS-Exchange-CrossTenant-FromEntityHeader: Hosted X-MS-Exchange-CrossTenant-Id: 54dbd822-5231-4b20-944d-6f4abcd541fb X-MS-Exchange-CrossTenant-MailboxType: HOSTED X-MS-Exchange-CrossTenant-UserPrincipalName: 0/L9vR67b4XzJgV5BpOu4n2YsojGqWd/F9a8IIISN0RmPf4SN0uOTlA/97bSUvPYl4d5k0ANBfKr/+DfrdzJOg== X-MS-Exchange-Transport-CrossTenantHeadersStamped: SA2PR11MB5002 Precedence: bulk List-ID: X-Mailing-List: netdev@vger.kernel.org From: Jérôme Pouiller Signed-off-by: Jérôme Pouiller --- drivers/net/wireless/silabs/wfx/bh.c | 329 +++++++++++++++++++++++++++ drivers/net/wireless/silabs/wfx/bh.h | 33 +++ 2 files changed, 362 insertions(+) create mode 100644 drivers/net/wireless/silabs/wfx/bh.c create mode 100644 drivers/net/wireless/silabs/wfx/bh.h diff --git a/drivers/net/wireless/silabs/wfx/bh.c b/drivers/net/wireless/silabs/wfx/bh.c new file mode 100644 index 000000000000..a5daf393f5aa --- /dev/null +++ b/drivers/net/wireless/silabs/wfx/bh.c @@ -0,0 +1,329 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* + * Interrupt bottom half (BH). + * + * Copyright (c) 2017-2020, Silicon Laboratories, Inc. + * Copyright (c) 2010, ST-Ericsson + */ +#include +#include + +#include "bh.h" +#include "wfx.h" +#include "hwio.h" +#include "traces.h" +#include "hif_rx.h" +#include "hif_api_cmd.h" + +static void device_wakeup(struct wfx_dev *wdev) +{ + int max_retry = 3; + + if (!wdev->pdata.gpio_wakeup) + return; + if (gpiod_get_value_cansleep(wdev->pdata.gpio_wakeup) > 0) + return; + + if (wfx_api_older_than(wdev, 1, 4)) { + gpiod_set_value_cansleep(wdev->pdata.gpio_wakeup, 1); + if (!completion_done(&wdev->hif.ctrl_ready)) + usleep_range(2000, 2500); + return; + } + for (;;) { + gpiod_set_value_cansleep(wdev->pdata.gpio_wakeup, 1); + /* completion.h does not provide any function to wait + * completion without consume it (a kind of + * wait_for_completion_done_timeout()). So we have to emulate + * it. + */ + if (wait_for_completion_timeout(&wdev->hif.ctrl_ready, + msecs_to_jiffies(2))) { + complete(&wdev->hif.ctrl_ready); + return; + } else if (max_retry-- > 0) { + /* Older firmwares have a race in sleep/wake-up process. + * Redo the process is sufficient to unfreeze the + * chip. + */ + dev_err(wdev->dev, "timeout while wake up chip\n"); + gpiod_set_value_cansleep(wdev->pdata.gpio_wakeup, 0); + usleep_range(2000, 2500); + } else { + dev_err(wdev->dev, "max wake-up retries reached\n"); + return; + } + } +} + +static void device_release(struct wfx_dev *wdev) +{ + if (!wdev->pdata.gpio_wakeup) + return; + + gpiod_set_value_cansleep(wdev->pdata.gpio_wakeup, 0); +} + +static int rx_helper(struct wfx_dev *wdev, size_t read_len, int *is_cnf) +{ + struct sk_buff *skb; + struct hif_msg *hif; + size_t alloc_len; + size_t computed_len; + int release_count; + int piggyback = 0; + + WARN(read_len > round_down(0xFFF, 2) * sizeof(u16), "request exceed the chip capability"); + + /* Add 2 to take into account piggyback size */ + alloc_len = wdev->hwbus_ops->align_size(wdev->hwbus_priv, read_len + 2); + skb = dev_alloc_skb(alloc_len); + if (!skb) + return -ENOMEM; + + if (wfx_data_read(wdev, skb->data, alloc_len)) + goto err; + + piggyback = le16_to_cpup((__le16 *)(skb->data + alloc_len - 2)); + _trace_piggyback(piggyback, false); + + hif = (struct hif_msg *)skb->data; + WARN(hif->encrypted & 0x3, "encryption is unsupported"); + if (WARN(read_len < sizeof(struct hif_msg), "corrupted read")) + goto err; + computed_len = le16_to_cpu(hif->len); + computed_len = round_up(computed_len, 2); + if (computed_len != read_len) { + dev_err(wdev->dev, "inconsistent message length: %zu != %zu\n", + computed_len, read_len); + print_hex_dump(KERN_INFO, "hif: ", DUMP_PREFIX_OFFSET, 16, 1, + hif, read_len, true); + goto err; + } + + if (!(hif->id & HIF_ID_IS_INDICATION)) { + (*is_cnf)++; + if (hif->id == HIF_CNF_ID_MULTI_TRANSMIT) + release_count = ((struct hif_cnf_multi_transmit *)hif->body)->num_tx_confs; + else + release_count = 1; + WARN(wdev->hif.tx_buffers_used < release_count, "corrupted buffer counter"); + wdev->hif.tx_buffers_used -= release_count; + } + _trace_hif_recv(hif, wdev->hif.tx_buffers_used); + + if (hif->id != HIF_IND_ID_EXCEPTION && hif->id != HIF_IND_ID_ERROR) { + if (hif->seqnum != wdev->hif.rx_seqnum) + dev_warn(wdev->dev, "wrong message sequence: %d != %d\n", + hif->seqnum, wdev->hif.rx_seqnum); + wdev->hif.rx_seqnum = (hif->seqnum + 1) % (HIF_COUNTER_MAX + 1); + } + + skb_put(skb, le16_to_cpu(hif->len)); + /* wfx_handle_rx takes care on SKB livetime */ + wfx_handle_rx(wdev, skb); + if (!wdev->hif.tx_buffers_used) + wake_up(&wdev->hif.tx_buffers_empty); + + return piggyback; + +err: + if (skb) + dev_kfree_skb(skb); + return -EIO; +} + +static int bh_work_rx(struct wfx_dev *wdev, int max_msg, int *num_cnf) +{ + size_t len; + int i; + int ctrl_reg, piggyback; + + piggyback = 0; + for (i = 0; i < max_msg; i++) { + if (piggyback & CTRL_NEXT_LEN_MASK) + ctrl_reg = piggyback; + else if (try_wait_for_completion(&wdev->hif.ctrl_ready)) + ctrl_reg = atomic_xchg(&wdev->hif.ctrl_reg, 0); + else + ctrl_reg = 0; + if (!(ctrl_reg & CTRL_NEXT_LEN_MASK)) + return i; + /* ctrl_reg units are 16bits words */ + len = (ctrl_reg & CTRL_NEXT_LEN_MASK) * 2; + piggyback = rx_helper(wdev, len, num_cnf); + if (piggyback < 0) + return i; + if (!(piggyback & CTRL_WLAN_READY)) + dev_err(wdev->dev, "unexpected piggyback value: ready bit not set: %04x\n", + piggyback); + } + if (piggyback & CTRL_NEXT_LEN_MASK) { + ctrl_reg = atomic_xchg(&wdev->hif.ctrl_reg, piggyback); + complete(&wdev->hif.ctrl_ready); + if (ctrl_reg) + dev_err(wdev->dev, "unexpected IRQ happened: %04x/%04x\n", + ctrl_reg, piggyback); + } + return i; +} + +static void tx_helper(struct wfx_dev *wdev, struct hif_msg *hif) +{ + int ret; + void *data; + bool is_encrypted = false; + size_t len = le16_to_cpu(hif->len); + + WARN(len < sizeof(*hif), "try to send corrupted data"); + + hif->seqnum = wdev->hif.tx_seqnum; + wdev->hif.tx_seqnum = (wdev->hif.tx_seqnum + 1) % (HIF_COUNTER_MAX + 1); + + data = hif; + WARN(len > wdev->hw_caps.size_inp_ch_buf, + "request exceed the chip capability: %zu > %d\n", + len, wdev->hw_caps.size_inp_ch_buf); + len = wdev->hwbus_ops->align_size(wdev->hwbus_priv, len); + ret = wfx_data_write(wdev, data, len); + if (ret) + goto end; + + wdev->hif.tx_buffers_used++; + _trace_hif_send(hif, wdev->hif.tx_buffers_used); +end: + if (is_encrypted) + kfree(data); +} + +static int bh_work_tx(struct wfx_dev *wdev, int max_msg) +{ + struct hif_msg *hif; + int i; + + for (i = 0; i < max_msg; i++) { + hif = NULL; + if (wdev->hif.tx_buffers_used < wdev->hw_caps.num_inp_ch_bufs) { + if (try_wait_for_completion(&wdev->hif_cmd.ready)) { + WARN(!mutex_is_locked(&wdev->hif_cmd.lock), "data locking error"); + hif = wdev->hif_cmd.buf_send; + } else { + hif = wfx_tx_queues_get(wdev); + } + } + if (!hif) + return i; + tx_helper(wdev, hif); + } + return i; +} + +/* In SDIO mode, it is necessary to make an access to a register to acknowledge + * last received message. It could be possible to restrict this acknowledge to + * SDIO mode and only if last operation was rx. + */ +static void ack_sdio_data(struct wfx_dev *wdev) +{ + u32 cfg_reg; + + config_reg_read(wdev, &cfg_reg); + if (cfg_reg & 0xFF) { + dev_warn(wdev->dev, "chip reports errors: %02x\n", + cfg_reg & 0xFF); + config_reg_write_bits(wdev, 0xFF, 0x00); + } +} + +static void bh_work(struct work_struct *work) +{ + struct wfx_dev *wdev = container_of(work, struct wfx_dev, hif.bh); + int stats_req = 0, stats_cnf = 0, stats_ind = 0; + bool release_chip = false, last_op_is_rx = false; + int num_tx, num_rx; + + device_wakeup(wdev); + do { + num_tx = bh_work_tx(wdev, 32); + stats_req += num_tx; + if (num_tx) + last_op_is_rx = false; + num_rx = bh_work_rx(wdev, 32, &stats_cnf); + stats_ind += num_rx; + if (num_rx) + last_op_is_rx = true; + } while (num_rx || num_tx); + stats_ind -= stats_cnf; + + if (last_op_is_rx) + ack_sdio_data(wdev); + if (!wdev->hif.tx_buffers_used && !work_pending(work)) { + device_release(wdev); + release_chip = true; + } + _trace_bh_stats(stats_ind, stats_req, stats_cnf, + wdev->hif.tx_buffers_used, release_chip); +} + +/* An IRQ from chip did occur */ +void wfx_bh_request_rx(struct wfx_dev *wdev) +{ + u32 cur, prev; + + control_reg_read(wdev, &cur); + prev = atomic_xchg(&wdev->hif.ctrl_reg, cur); + complete(&wdev->hif.ctrl_ready); + queue_work(system_highpri_wq, &wdev->hif.bh); + + if (!(cur & CTRL_NEXT_LEN_MASK)) + dev_err(wdev->dev, "unexpected control register value: length field is 0: %04x\n", + cur); + if (prev != 0) + dev_err(wdev->dev, "received IRQ but previous data was not (yet) read: %04x/%04x\n", + prev, cur); +} + +/* Driver want to send data */ +void wfx_bh_request_tx(struct wfx_dev *wdev) +{ + queue_work(system_highpri_wq, &wdev->hif.bh); +} + +/* If IRQ is not available, this function allow to manually poll the control + * register and simulate an IRQ ahen an event happened. + * + * Note that the device has a bug: If an IRQ raise while host read control + * register, the IRQ is lost. So, use this function carefully (only duing + * device initialisation). + */ +void wfx_bh_poll_irq(struct wfx_dev *wdev) +{ + ktime_t now, start; + u32 reg; + + WARN(!wdev->poll_irq, "unexpected IRQ polling can mask IRQ"); + start = ktime_get(); + for (;;) { + control_reg_read(wdev, ®); + now = ktime_get(); + if (reg & 0xFFF) + break; + if (ktime_after(now, ktime_add_ms(start, 1000))) { + dev_err(wdev->dev, "time out while polling control register\n"); + return; + } + udelay(200); + } + wfx_bh_request_rx(wdev); +} + +void wfx_bh_register(struct wfx_dev *wdev) +{ + INIT_WORK(&wdev->hif.bh, bh_work); + init_completion(&wdev->hif.ctrl_ready); + init_waitqueue_head(&wdev->hif.tx_buffers_empty); +} + +void wfx_bh_unregister(struct wfx_dev *wdev) +{ + flush_work(&wdev->hif.bh); +} diff --git a/drivers/net/wireless/silabs/wfx/bh.h b/drivers/net/wireless/silabs/wfx/bh.h new file mode 100644 index 000000000000..6c121ce4dd3f --- /dev/null +++ b/drivers/net/wireless/silabs/wfx/bh.h @@ -0,0 +1,33 @@ +/* SPDX-License-Identifier: GPL-2.0-only */ +/* + * Interrupt bottom half (BH). + * + * Copyright (c) 2017-2020, Silicon Laboratories, Inc. + * Copyright (c) 2010, ST-Ericsson + */ +#ifndef WFX_BH_H +#define WFX_BH_H + +#include +#include +#include + +struct wfx_dev; + +struct wfx_hif { + struct work_struct bh; + struct completion ctrl_ready; + wait_queue_head_t tx_buffers_empty; + atomic_t ctrl_reg; + int rx_seqnum; + int tx_seqnum; + int tx_buffers_used; +}; + +void wfx_bh_register(struct wfx_dev *wdev); +void wfx_bh_unregister(struct wfx_dev *wdev); +void wfx_bh_request_rx(struct wfx_dev *wdev); +void wfx_bh_request_tx(struct wfx_dev *wdev); +void wfx_bh_poll_irq(struct wfx_dev *wdev); + +#endif