From patchwork Fri Aug 19 21:14:14 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Heiner Kallweit X-Patchwork-Id: 12949230 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id D79E7C32771 for ; Fri, 19 Aug 2022 21:14:31 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1350978AbiHSVOa (ORCPT ); Fri, 19 Aug 2022 17:14:30 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:57134 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S231806AbiHSVO3 (ORCPT ); Fri, 19 Aug 2022 17:14:29 -0400 Received: from mail-ed1-x533.google.com (mail-ed1-x533.google.com [IPv6:2a00:1450:4864:20::533]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 0639A90180 for ; Fri, 19 Aug 2022 14:14:28 -0700 (PDT) Received: by mail-ed1-x533.google.com with SMTP id s11so7040695edd.13 for ; Fri, 19 Aug 2022 14:14:27 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20210112; h=content-transfer-encoding:in-reply-to:references:cc:to:from :content-language:subject:user-agent:mime-version:date:message-id :from:to:cc; bh=bRAqf/rrC4BijRq9DtmS6iekCP1lTeD+37Vq8/7jSNs=; b=La/gmQV78ir0WJJOxMQg7TAIsEajXETRBHYkya2mWVELQ9rczUYWEZLrWpC9qVxlz+ YykR9M0WL3FD/3jFoXz9NGTj0aJSyeNq7bY8ctydKkulVC1XYxcG0JbJrPcnf2wd1+sM hTxmqQyRUOHjOB1lmEYI+GdQGcJal/UrLntJVFoNwHtp62ByOY3+fwIAwiR1pwWulhn6 kQqyROqNRDga1bj+fpe616em8NA5nRyX8nLsqLuZR/aO1WJSoNINmJ3aaD6gZ+SUcAGK 27af8ctX/CdNFh/hmWEWkImaZMsyAnOZX5qkxIcv+L6PEUo3cP8BxD+GOAkds+UTuHJb /mPA== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; h=content-transfer-encoding:in-reply-to:references:cc:to:from :content-language:subject:user-agent:mime-version:date:message-id :x-gm-message-state:from:to:cc; bh=bRAqf/rrC4BijRq9DtmS6iekCP1lTeD+37Vq8/7jSNs=; b=7J9abQhL5oJdRvsX1vtHd8XtnJryMyg8Si+BX2q6Mvtvt7DhBHlrLt1G62wucG32L0 DhPY8kZBTrhEAaYgxhrIxqctBZ3VV2pWDHaHDV1ViCkwSFsRvpZDsstxqyIckXffYgBB VKlQX20WmiF73IWo0lS0lHgx5SgSSnDz21+3vanqMB8CTpvu8qHXR969GRr5WrOxmPlf lp4ScWtjfAjUqchtUA1SG2p8VoxAD8YeBo1qVivsSdrPlsS2ZLHnViqM4+8yYYrChHxs WlDIQFRUA2Mhttw6fhe2BiFpSXVVV0sb6/DGUvPH+q4Wua1kZKHwm5tfstq50qDxUnKk 9SPQ== X-Gm-Message-State: ACgBeo1Oby6W4bUGItfUrIKIjKpdpzg3dlItPlDYdLDNgORCQhwkYYQa 2Wd3LCoMH0oS9nZeab2OtIw= X-Google-Smtp-Source: AA6agR5buxwANzNAa4uGpk849x7skznNFJyzw1cjqtbQgnYofu4XsUaamL+wkhag4SCS+kQMnkE08Q== X-Received: by 2002:a05:6402:358a:b0:43d:aa71:3033 with SMTP id y10-20020a056402358a00b0043daa713033mr7439672edc.248.1660943665859; Fri, 19 Aug 2022 14:14:25 -0700 (PDT) Received: from ?IPV6:2a01:c23:c5ac:3600:6819:de7b:5db7:493? (dynamic-2a01-0c23-c5ac-3600-6819-de7b-5db7-0493.c23.pool.telefonica.de. [2a01:c23:c5ac:3600:6819:de7b:5db7:493]) by smtp.googlemail.com with ESMTPSA id kx10-20020a170907774a00b00730cc173c6asm2826316ejc.43.2022.08.19.14.14.25 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Fri, 19 Aug 2022 14:14:25 -0700 (PDT) Message-ID: Date: Fri, 19 Aug 2022 23:14:14 +0200 MIME-Version: 1.0 User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:91.0) Gecko/20100101 Thunderbird/91.12.0 Subject: [PATCH v2 2/2] mmc: meson-gx: add SDIO interrupt support Content-Language: en-US From: Heiner Kallweit To: Ulf Hansson , Neil Armstrong , Kevin Hilman , Jerome Brunet , Martin Blumenstingl Cc: "linux-mmc@vger.kernel.org" , "linux-arm-kernel@lists.infradead.org" , "open list:ARM/Amlogic Meson..." References: In-Reply-To: Precedence: bulk List-ID: X-Mailing-List: linux-mmc@vger.kernel.org Add SDIO interrupt support. Successfully tested on a S905X4-based system (V3 register layout) with a BRCM4334 SDIO wifi module (brcmfmac driver). The implementation also considers the potential race discussed in [0]. [0] https://lore.kernel.org/linux-arm-kernel/CAPDyKFoJDhjLkajBHgW3zHasvYYri77NQoDpiW-BpKgkdjtOyg@mail.gmail.com/ Signed-off-by: Heiner Kallweit --- drivers/mmc/host/meson-gx-mmc.c | 76 ++++++++++++++++++++++++++++----- 1 file changed, 66 insertions(+), 10 deletions(-) diff --git a/drivers/mmc/host/meson-gx-mmc.c b/drivers/mmc/host/meson-gx-mmc.c index 9a4da2544..58b7836a5 100644 --- a/drivers/mmc/host/meson-gx-mmc.c +++ b/drivers/mmc/host/meson-gx-mmc.c @@ -41,14 +41,17 @@ #define CLK_V2_TX_DELAY_MASK GENMASK(19, 16) #define CLK_V2_RX_DELAY_MASK GENMASK(23, 20) #define CLK_V2_ALWAYS_ON BIT(24) +#define CLK_V2_IRQ_SDIO_SLEEP BIT(25) #define CLK_V3_TX_DELAY_MASK GENMASK(21, 16) #define CLK_V3_RX_DELAY_MASK GENMASK(27, 22) #define CLK_V3_ALWAYS_ON BIT(28) +#define CLK_V3_IRQ_SDIO_SLEEP BIT(29) #define CLK_TX_DELAY_MASK(h) (h->data->tx_delay_mask) #define CLK_RX_DELAY_MASK(h) (h->data->rx_delay_mask) #define CLK_ALWAYS_ON(h) (h->data->always_on) +#define CLK_IRQ_SDIO_SLEEP(h) (h->data->irq_sdio_sleep) #define SD_EMMC_DELAY 0x4 #define SD_EMMC_ADJUST 0x8 @@ -135,6 +138,7 @@ struct meson_mmc_data { unsigned int rx_delay_mask; unsigned int always_on; unsigned int adjust; + unsigned int irq_sdio_sleep; }; struct sd_emmc_desc { @@ -174,6 +178,7 @@ struct meson_host { bool vqmmc_enabled; bool needs_pre_post_req; + spinlock_t lock; }; #define CMD_CFG_LENGTH_MASK GENMASK(8, 0) @@ -430,6 +435,7 @@ static int meson_mmc_clk_init(struct meson_host *host) clk_reg |= FIELD_PREP(CLK_CORE_PHASE_MASK, CLK_PHASE_180); clk_reg |= FIELD_PREP(CLK_TX_PHASE_MASK, CLK_PHASE_0); clk_reg |= FIELD_PREP(CLK_RX_PHASE_MASK, CLK_PHASE_0); + clk_reg |= CLK_IRQ_SDIO_SLEEP(host); writel(clk_reg, host->regs + SD_EMMC_CLOCK); /* get the mux parents */ @@ -934,32 +940,54 @@ static void meson_mmc_read_resp(struct mmc_host *mmc, struct mmc_command *cmd) } } +static void __meson_mmc_enable_sdio_irq(struct mmc_host *mmc, int enable) +{ + struct meson_host *host = mmc_priv(mmc); + u32 reg_irqen = IRQ_EN_MASK; + + if (enable) + reg_irqen |= IRQ_SDIO; + writel(reg_irqen, host->regs + SD_EMMC_IRQ_EN); +} + static irqreturn_t meson_mmc_irq(int irq, void *dev_id) { struct meson_host *host = dev_id; struct mmc_command *cmd; - struct mmc_data *data; u32 status, raw_status; irqreturn_t ret = IRQ_NONE; raw_status = readl(host->regs + SD_EMMC_STATUS); - status = raw_status & IRQ_EN_MASK; + status = raw_status & (IRQ_EN_MASK | IRQ_SDIO); if (!status) { dev_dbg(host->dev, "Unexpected IRQ! irq_en 0x%08lx - status 0x%08x\n", - IRQ_EN_MASK, raw_status); + IRQ_EN_MASK | IRQ_SDIO, raw_status); return IRQ_NONE; } - if (WARN_ON(!host) || WARN_ON(!host->cmd)) + if (WARN_ON(!host)) return IRQ_NONE; /* ack all raised interrupts */ writel(status, host->regs + SD_EMMC_STATUS); cmd = host->cmd; - data = cmd->data; + + if (status & IRQ_SDIO) { + spin_lock(&host->lock); + __meson_mmc_enable_sdio_irq(host->mmc, 0); + sdio_signal_irq(host->mmc); + spin_unlock(&host->lock); + status &= ~IRQ_SDIO; + if (!status) + return IRQ_HANDLED; + } + + if (WARN_ON(!cmd)) + return IRQ_NONE; + cmd->error = 0; if (status & IRQ_CRC_ERR) { dev_dbg(host->dev, "CRC Error - status 0x%08x\n", status); @@ -977,12 +1005,9 @@ static irqreturn_t meson_mmc_irq(int irq, void *dev_id) meson_mmc_read_resp(host->mmc, cmd); - if (status & IRQ_SDIO) { - dev_dbg(host->dev, "IRQ: SDIO TODO.\n"); - ret = IRQ_HANDLED; - } - if (status & (IRQ_END_OF_CHAIN | IRQ_RESP_STATUS)) { + struct mmc_data *data = cmd->data; + if (data && !cmd->error) data->bytes_xfered = data->blksz * data->blocks; if (meson_mmc_bounce_buf_read(data) || @@ -1125,6 +1150,27 @@ static int meson_mmc_voltage_switch(struct mmc_host *mmc, struct mmc_ios *ios) return -EINVAL; } +static void meson_mmc_enable_sdio_irq(struct mmc_host *mmc, int enable) +{ + struct meson_host *host = mmc_priv(mmc); + unsigned long flags; + + spin_lock_irqsave(&host->lock, flags); + __meson_mmc_enable_sdio_irq(mmc, enable); + spin_unlock_irqrestore(&host->lock, flags); +} + +static void meson_mmc_ack_sdio_irq(struct mmc_host *mmc) +{ + struct meson_host *host = mmc_priv(mmc); + unsigned long flags; + + spin_lock_irqsave(&host->lock, flags); + if (!mmc->sdio_irq_pending) + __meson_mmc_enable_sdio_irq(mmc, 1); + spin_unlock_irqrestore(&host->lock, flags); +} + static const struct mmc_host_ops meson_mmc_ops = { .request = meson_mmc_request, .set_ios = meson_mmc_set_ios, @@ -1134,6 +1180,8 @@ static const struct mmc_host_ops meson_mmc_ops = { .execute_tuning = meson_mmc_resampling_tuning, .card_busy = meson_mmc_card_busy, .start_signal_voltage_switch = meson_mmc_voltage_switch, + .enable_sdio_irq = meson_mmc_enable_sdio_irq, + .ack_sdio_irq = meson_mmc_ack_sdio_irq, }; static int meson_mmc_probe(struct platform_device *pdev) @@ -1237,7 +1285,13 @@ static int meson_mmc_probe(struct platform_device *pdev) if (ret) goto err_init_clk; + spin_lock_init(&host->lock); + mmc->caps |= MMC_CAP_CMD23; + + if (mmc->caps & MMC_CAP_SDIO_IRQ) + mmc->caps2 |= MMC_CAP2_SDIO_IRQ_NOTHREAD; + if (host->dram_access_quirk) { /* Limit segments to 1 due to low available sram memory */ mmc->max_segs = 1; @@ -1328,6 +1382,7 @@ static const struct meson_mmc_data meson_gx_data = { .rx_delay_mask = CLK_V2_RX_DELAY_MASK, .always_on = CLK_V2_ALWAYS_ON, .adjust = SD_EMMC_ADJUST, + .irq_sdio_sleep = CLK_V2_IRQ_SDIO_SLEEP, }; static const struct meson_mmc_data meson_axg_data = { @@ -1335,6 +1390,7 @@ static const struct meson_mmc_data meson_axg_data = { .rx_delay_mask = CLK_V3_RX_DELAY_MASK, .always_on = CLK_V3_ALWAYS_ON, .adjust = SD_EMMC_V3_ADJUST, + .irq_sdio_sleep = CLK_V3_IRQ_SDIO_SLEEP, }; static const struct of_device_id meson_mmc_of_match[] = {