From patchwork Tue Oct 20 12:58:00 2020 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: 11846865 X-Patchwork-Delegate: kvalo@adurom.com Return-Path: Received: from mail.kernel.org (pdx-korg-mail-1.web.codeaurora.org [172.30.200.123]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id E55F614B7 for ; Tue, 20 Oct 2020 13:02:15 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id A9367224B8 for ; Tue, 20 Oct 2020 13:02:15 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (1024-bit key) header.d=silabs.onmicrosoft.com header.i=@silabs.onmicrosoft.com header.b="Df8UICfa" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S2407270AbgJTNCM (ORCPT ); Tue, 20 Oct 2020 09:02:12 -0400 Received: from mail-dm6nam12on2042.outbound.protection.outlook.com ([40.107.243.42]:21473 "EHLO NAM12-DM6-obe.outbound.protection.outlook.com" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S2406863AbgJTM7J (ORCPT ); Tue, 20 Oct 2020 08:59:09 -0400 ARC-Seal: i=1; a=rsa-sha256; s=arcselector9901; d=microsoft.com; cv=none; b=Cuv9tZBYm0OjZ8ImcogDXLcAuFBiyU3kZlxzTWWr83jw3Mg7H8S4wcX8LJa2Ctq1xngfEfPvyvhb2XAoMKw9J/o/WggeQ77snSw5gto/KcdCKrbbDp5C64+WVwNRoDkjN8IW7DkGEhIt/4ex3ygcuvob4C+jb/20vLiPTgnoPsRgokdac4bS21vostkb0QLcesHy893NAo+ta9iBvFlaAt9VA0Zbnziw3icrKIO+v43TshmE+Em1hKyh4wLnU4dUxivBNNNjuZCmqpUAMH3lKIxTVFKwOtF7SDkcn8bcF7JPplvL6nV+rL2Do2yEp8M4MDdSgVnsPPO4OXJ5onEJUQ== 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:X-MS-Exchange-SenderADCheck; bh=EJe6Sy6mxOMEzb8LjIqDJlH42l1rhbHuYENIx/3Vvmg=; b=Y6P+VAYx+4waMJ2KrJhwpT26hafwfo+SpGlHfdy9CCP+pp9z6Kyn6NqgtP7IyzMieR2GAnkwK52GGmjxrCIsr4wkJfbMLxJELAYCegXKk+b/WaY0RqEb42brz6FZZNrXmWIDLulYkBUPIpve+gVT/tDkl7XA5IVqs9mBUDA4Dpdj+EOqEgxw4CCln6punxKzhQeHMkXOeb/ZBt3KH/zj5sO1JAhzN6SLfu7/+BFixZsWJUbneioS2E1ztad98fnrn0Wg2vH5A9WlnZEZFAOLXVOqnnIARcge6LO0gHfAOGsR+24IBhSMZNTXaI6myHXqUS2Oa2jfdM6U/VtBlHAKhQ== 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=EJe6Sy6mxOMEzb8LjIqDJlH42l1rhbHuYENIx/3Vvmg=; b=Df8UICfaFkNnFiCfzPvp7f+jhZ/t0Zd7mQuMdxZEwBGCx/ahBGr4AOejVQ0d5ooD60fC0o69eyaT6Soz8QFpzUjrKxFjaE4J8KOe6mZ1RtEdSNe36lt/pZbgXIx3Pyj+lBt2mBf1yUMclO3vr4x8DasMK/7p5oeXbEb+zSNjrZs= 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 SN6PR11MB2656.namprd11.prod.outlook.com (2603:10b6:805:58::28) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.3477.28; Tue, 20 Oct 2020 12:58:57 +0000 Received: from SN6PR11MB2718.namprd11.prod.outlook.com ([fe80::4f5:fbe5:44a7:cb8a]) by SN6PR11MB2718.namprd11.prod.outlook.com ([fe80::4f5:fbe5:44a7:cb8a%5]) with mapi id 15.20.3477.028; Tue, 20 Oct 2020 12:58:57 +0000 From: Jerome Pouiller To: linux-wireless@vger.kernel.org, netdev@vger.kernel.org Cc: devel@driverdev.osuosl.org, linux-kernel@vger.kernel.org, Greg Kroah-Hartman , Kalle Valo , "David S . Miller" , devicetree@vger.kernel.org, Rob Herring , linux-mmc@vger.kernel.org, =?utf-8?q?Pali_Roh=C3=A1r?= , Ulf Hansson , =?utf-8?b?SsOpcsO0bWUgUG91aWxsZXI=?= Subject: [PATCH v2 07/24] wfx: add bus_spi.c Date: Tue, 20 Oct 2020 14:58:00 +0200 Message-Id: <20201020125817.1632995-8-Jerome.Pouiller@silabs.com> X-Mailer: git-send-email 2.28.0 In-Reply-To: <20201020125817.1632995-1-Jerome.Pouiller@silabs.com> References: <20201020125817.1632995-1-Jerome.Pouiller@silabs.com> X-Originating-IP: [37.71.187.125] X-ClientProxiedBy: PR3P192CA0026.EURP192.PROD.OUTLOOK.COM (2603:10a6:102:56::31) To SN6PR11MB2718.namprd11.prod.outlook.com (2603:10b6:805:63::18) MIME-Version: 1.0 X-MS-Exchange-MessageSentRepresentingType: 1 Received: from pc-42.silabs.com (37.71.187.125) by PR3P192CA0026.EURP192.PROD.OUTLOOK.COM (2603:10a6:102:56::31) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.3477.21 via Frontend Transport; Tue, 20 Oct 2020 12:58:55 +0000 X-MS-PublicTrafficType: Email X-MS-Office365-Filtering-Correlation-Id: 28089db0-f9e0-4b4f-2061-08d874f7e807 X-MS-TrafficTypeDiagnostic: SN6PR11MB2656: X-MS-Exchange-Transport-Forked: True X-Microsoft-Antispam-PRVS: X-MS-Oob-TLC-OOBClassifiers: OLM:2089; X-MS-Exchange-SenderADCheck: 1 X-Microsoft-Antispam: BCL:0; X-Microsoft-Antispam-Message-Info: j6FbWA0jNVXiFdLOZz987cTwEVj8D+l+IkmTVTgly9j+H2dAuyrLKZO/bKdPP4C79cG6CEWk2czzJKsKGd3Y4UqSqr/VrFrwpy6THSQy+VIo7xDam/oAFPTSw3nSEZPtltTd0OY0eR0/agV7+H3IKTaRaUuoQtHD9stm5fY3Bh9g11Q+z7jNaiLRg8y+dLDfHDetTD+qviQ61WYVv8GBRBqtvjR45+1ZcqVDqQyAL7n8U4agMGQRL/5Ma1AiCJZlWBIuoO4+jkfpIMse4jRsLTCfpj/AubJ7PPENqz01p44mP5uxg6wNxOlw9xTpIWZahKRw4/drXk80BsjcSWBuCg== 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:(396003)(366004)(136003)(39830400003)(346002)(376002)(186003)(316002)(4326008)(107886003)(8676002)(86362001)(26005)(2906002)(7696005)(478600001)(16526019)(956004)(6486002)(52116002)(36756003)(8936002)(2616005)(54906003)(5660300002)(1076003)(7416002)(66574015)(6666004)(66556008)(66476007)(66946007)(83380400001);DIR:OUT;SFP:1101; X-MS-Exchange-AntiSpam-MessageData: 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 X-OriginatorOrg: silabs.com X-MS-Exchange-CrossTenant-Network-Message-Id: 28089db0-f9e0-4b4f-2061-08d874f7e807 X-MS-Exchange-CrossTenant-AuthSource: SN6PR11MB2718.namprd11.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Internal X-MS-Exchange-CrossTenant-OriginalArrivalTime: 20 Oct 2020 12:58:57.2509 (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: lUNb6Pvb5AqPtnAGnI/MLELWzYfqHoKOL+SP9EdYokng5GpVNvtUKmqrPs2nHN693OFMBfglA0s1vqD3ksAEKg== X-MS-Exchange-Transport-CrossTenantHeadersStamped: SN6PR11MB2656 Precedence: bulk List-ID: X-Mailing-List: linux-wireless@vger.kernel.org From: Jérôme Pouiller Signed-off-by: Jérôme Pouiller --- drivers/net/wireless/silabs/wfx/bus_spi.c | 271 ++++++++++++++++++++++ 1 file changed, 271 insertions(+) create mode 100644 drivers/net/wireless/silabs/wfx/bus_spi.c diff --git a/drivers/net/wireless/silabs/wfx/bus_spi.c b/drivers/net/wireless/silabs/wfx/bus_spi.c new file mode 100644 index 000000000000..a99125d1a30d --- /dev/null +++ b/drivers/net/wireless/silabs/wfx/bus_spi.c @@ -0,0 +1,271 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* + * SPI interface. + * + * Copyright (c) 2017-2020, Silicon Laboratories, Inc. + * Copyright (c) 2011, Sagrad Inc. + * Copyright (c) 2010, ST-Ericsson + */ +#include +#include +#include +#include +#include +#include +#include + +#include "bus.h" +#include "wfx.h" +#include "hwio.h" +#include "main.h" +#include "bh.h" + +#define SET_WRITE 0x7FFF /* usage: and operation */ +#define SET_READ 0x8000 /* usage: or operation */ + +#define WFX_RESET_INVERTED 1 + +static const struct wfx_platform_data wfx_spi_pdata = { + .file_fw = "wfm_wf200", + .file_pds = "wf200.pds", + .use_rising_clk = true, +}; + +struct wfx_spi_priv { + struct spi_device *func; + struct wfx_dev *core; + struct gpio_desc *gpio_reset; + bool need_swab; +}; + +/* + * WFx chip read data 16bits at time and place them directly into (little + * endian) CPU register. So, chip expect byte order like "B1 B0 B3 B2" (while + * LE is "B0 B1 B2 B3" and BE is "B3 B2 B1 B0") + * + * A little endian host with bits_per_word == 16 should do the right job + * natively. The code below to support big endian host and commonly used SPI + * 8bits. + */ +static int wfx_spi_copy_from_io(void *priv, unsigned int addr, + void *dst, size_t count) +{ + struct wfx_spi_priv *bus = priv; + u16 regaddr = (addr << 12) | (count / 2) | SET_READ; + struct spi_message m; + struct spi_transfer t_addr = { + .tx_buf = ®addr, + .len = sizeof(regaddr), + }; + struct spi_transfer t_msg = { + .rx_buf = dst, + .len = count, + }; + u16 *dst16 = dst; + int ret, i; + + WARN(count % 2, "buffer size must be a multiple of 2"); + + cpu_to_le16s(®addr); + if (bus->need_swab) + swab16s(®addr); + + spi_message_init(&m); + spi_message_add_tail(&t_addr, &m); + spi_message_add_tail(&t_msg, &m); + ret = spi_sync(bus->func, &m); + + if (bus->need_swab && addr == WFX_REG_CONFIG) + for (i = 0; i < count / 2; i++) + swab16s(&dst16[i]); + return ret; +} + +static int wfx_spi_copy_to_io(void *priv, unsigned int addr, + const void *src, size_t count) +{ + struct wfx_spi_priv *bus = priv; + u16 regaddr = (addr << 12) | (count / 2); + // FIXME: use a bounce buffer + u16 *src16 = (void *)src; + int ret, i; + struct spi_message m; + struct spi_transfer t_addr = { + .tx_buf = ®addr, + .len = sizeof(regaddr), + }; + struct spi_transfer t_msg = { + .tx_buf = src, + .len = count, + }; + + WARN(count % 2, "buffer size must be a multiple of 2"); + WARN(regaddr & SET_READ, "bad addr or size overflow"); + + cpu_to_le16s(®addr); + + // Register address and CONFIG content always use 16bit big endian + // ("BADC" order) + if (bus->need_swab) + swab16s(®addr); + if (bus->need_swab && addr == WFX_REG_CONFIG) + for (i = 0; i < count / 2; i++) + swab16s(&src16[i]); + + spi_message_init(&m); + spi_message_add_tail(&t_addr, &m); + spi_message_add_tail(&t_msg, &m); + ret = spi_sync(bus->func, &m); + + if (bus->need_swab && addr == WFX_REG_CONFIG) + for (i = 0; i < count / 2; i++) + swab16s(&src16[i]); + return ret; +} + +static void wfx_spi_lock(void *priv) +{ +} + +static void wfx_spi_unlock(void *priv) +{ +} + +static irqreturn_t wfx_spi_irq_handler(int irq, void *priv) +{ + struct wfx_spi_priv *bus = priv; + + wfx_bh_request_rx(bus->core); + return IRQ_HANDLED; +} + +static int wfx_spi_irq_subscribe(void *priv) +{ + struct wfx_spi_priv *bus = priv; + u32 flags; + + flags = irq_get_trigger_type(bus->func->irq); + if (!flags) + flags = IRQF_TRIGGER_HIGH; + flags |= IRQF_ONESHOT; + return devm_request_threaded_irq(&bus->func->dev, bus->func->irq, NULL, + wfx_spi_irq_handler, IRQF_ONESHOT, + "wfx", bus); +} + +static int wfx_spi_irq_unsubscribe(void *priv) +{ + struct wfx_spi_priv *bus = priv; + + devm_free_irq(&bus->func->dev, bus->func->irq, bus); + return 0; +} + +static size_t wfx_spi_align_size(void *priv, size_t size) +{ + // Most of SPI controllers avoid DMA if buffer size is not 32bit aligned + return ALIGN(size, 4); +} + +static const struct hwbus_ops wfx_spi_hwbus_ops = { + .copy_from_io = wfx_spi_copy_from_io, + .copy_to_io = wfx_spi_copy_to_io, + .irq_subscribe = wfx_spi_irq_subscribe, + .irq_unsubscribe = wfx_spi_irq_unsubscribe, + .lock = wfx_spi_lock, + .unlock = wfx_spi_unlock, + .align_size = wfx_spi_align_size, +}; + +static int wfx_spi_probe(struct spi_device *func) +{ + struct wfx_spi_priv *bus; + int ret; + + if (!func->bits_per_word) + func->bits_per_word = 16; + ret = spi_setup(func); + if (ret) + return ret; + // Trace below is also displayed by spi_setup() if compiled with DEBUG + dev_dbg(&func->dev, "SPI params: CS=%d, mode=%d bits/word=%d speed=%d\n", + func->chip_select, func->mode, func->bits_per_word, + func->max_speed_hz); + if (func->bits_per_word != 16 && func->bits_per_word != 8) + dev_warn(&func->dev, "unusual bits/word value: %d\n", + func->bits_per_word); + if (func->max_speed_hz > 50000000) + dev_warn(&func->dev, "%dHz is a very high speed\n", + func->max_speed_hz); + + bus = devm_kzalloc(&func->dev, sizeof(*bus), GFP_KERNEL); + if (!bus) + return -ENOMEM; + bus->func = func; + if (func->bits_per_word == 8 || IS_ENABLED(CONFIG_CPU_BIG_ENDIAN)) + bus->need_swab = true; + spi_set_drvdata(func, bus); + + bus->gpio_reset = devm_gpiod_get_optional(&func->dev, "reset", + GPIOD_OUT_LOW); + if (IS_ERR(bus->gpio_reset)) + return PTR_ERR(bus->gpio_reset); + if (!bus->gpio_reset) { + dev_warn(&func->dev, + "gpio reset is not defined, trying to load firmware anyway\n"); + } else { + gpiod_set_consumer_name(bus->gpio_reset, "wfx reset"); + if (spi_get_device_id(func)->driver_data & WFX_RESET_INVERTED) + gpiod_toggle_active_low(bus->gpio_reset); + gpiod_set_value_cansleep(bus->gpio_reset, 1); + usleep_range(100, 150); + gpiod_set_value_cansleep(bus->gpio_reset, 0); + usleep_range(2000, 2500); + } + + bus->core = wfx_init_common(&func->dev, &wfx_spi_pdata, + &wfx_spi_hwbus_ops, bus); + if (!bus->core) + return -EIO; + + return wfx_probe(bus->core); +} + +static int wfx_spi_remove(struct spi_device *func) +{ + struct wfx_spi_priv *bus = spi_get_drvdata(func); + + wfx_release(bus->core); + return 0; +} + +/* + * For dynamic driver binding, kernel does not use OF to match driver. It only + * use modalias and modalias is a copy of 'compatible' DT node with vendor + * stripped. + */ +static const struct spi_device_id wfx_spi_id[] = { + { "wfx-spi", WFX_RESET_INVERTED }, + { "wf200", 0 }, + { }, +}; +MODULE_DEVICE_TABLE(spi, wfx_spi_id); + +#ifdef CONFIG_OF +static const struct of_device_id wfx_spi_of_match[] = { + { .compatible = "silabs,wfx-spi", .data = (void *)WFX_RESET_INVERTED }, + { .compatible = "silabs,wf200" }, + { }, +}; +MODULE_DEVICE_TABLE(of, wfx_spi_of_match); +#endif + +struct spi_driver wfx_spi_driver = { + .driver = { + .name = "wfx-spi", + .of_match_table = of_match_ptr(wfx_spi_of_match), + }, + .id_table = wfx_spi_id, + .probe = wfx_spi_probe, + .remove = wfx_spi_remove, +};