From patchwork Mon Dec 18 21:07:05 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Kamal Dasu X-Patchwork-Id: 755810 Received: from mail-pg1-f173.google.com (mail-pg1-f173.google.com [209.85.215.173]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 1F4ED740BD for ; Mon, 18 Dec 2023 21:07:25 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=quarantine dis=none) header.from=broadcom.com Authentication-Results: smtp.subspace.kernel.org; spf=fail smtp.mailfrom=broadcom.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=broadcom.com header.i=@broadcom.com header.b="NeGFwi9X" Received: by mail-pg1-f173.google.com with SMTP id 41be03b00d2f7-5bcfc508d14so2956780a12.3 for ; Mon, 18 Dec 2023 13:07:25 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=broadcom.com; s=google; t=1702933644; x=1703538444; darn=vger.kernel.org; h=references:in-reply-to:message-id:date:subject:cc:to:from:from:to :cc:subject:date:message-id:reply-to; bh=ESlzOHajmXaMzTKlf//pm1lFSL32UDC91Ihrd5T9bv8=; b=NeGFwi9XGV2E1+nzaPasbx9nYxIfg88e9RFg/8CTXSYMUCE7mucYxPZieLLE95+mh+ dXvmCpkMimqkHeXDPi15GJNZPZUyo9cjKGF0w/ZOO/pV7Z25eh0WZjya2X6RZNLixHET 6l/GYwRDaTG2lAraUxdENEcuBrgSK78WtThT0= X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1702933644; x=1703538444; h=references:in-reply-to:message-id:date:subject:cc:to:from :x-gm-message-state:from:to:cc:subject:date:message-id:reply-to; bh=ESlzOHajmXaMzTKlf//pm1lFSL32UDC91Ihrd5T9bv8=; b=eYmqh4MyV8ypjsMobkuuBZQx7zmScIf3gWCMxA9mFG1molTSiZfigt4oEPqJFnRhHO s/JWDSmSRXldLIZJoDdxFCHtE4FSiP5KkTH9XaZb9COd7lrzizcgw17qR18pfePNnZPP yEmi1EHZtkK50JPxLotceWEwhUV3XLo2K0btr3mu8AU/eu1MNuXIb6CakrmhHXZDvnB+ EuBuAi3JIP5MYLpCWy4bbKS2TLbqOP5w8TCnnsndasOOGP10UikmvBN4JVFiBh6tJMHW MPpGIu9zWvC0xMn0E/fskVpvUQ4NPd3oBJjKYJsflEZuIy1AWQ8FVovq2xNRgaTIRV0C seEg== X-Gm-Message-State: AOJu0YxE/rHsfjkhVoYT3l4GdIgkjkSYOt6ZURGWQzezVCQjVNXh6H6C PSf2ubBKo/px0A2oZnZEIZ3/Hg== X-Google-Smtp-Source: AGHT+IGIjcCloGrKTkoPYO4vlUo1N1iLeuQIxuxxQStUvEL4hR8aHEYyMpNCVy5EAyctvVpGxTaKwA== X-Received: by 2002:a05:6a21:3281:b0:18f:c339:3fc4 with SMTP id yt1-20020a056a21328100b0018fc3393fc4mr22831709pzb.83.1702933644534; Mon, 18 Dec 2023 13:07:24 -0800 (PST) Received: from mail.broadcom.net ([192.19.144.250]) by smtp.gmail.com with ESMTPSA id i17-20020aa787d1000000b006d3b2008406sm4473417pfo.50.2023.12.18.13.07.22 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 18 Dec 2023 13:07:24 -0800 (PST) From: Kamal Dasu To: ulf.hansson@linaro.org, linux-kernel@vger.kernel.org, alcooperx@gmail.com, linux-arm-kernel@lists.infradead.org, adrian.hunter@intel.com, linux-mmc@vger.kernel.org, robh+dt@kernel.org, krzysztof.kozlowski+dt@linaro.org, conor+dt@kernel.org, devicetree@vger.kernel.org Cc: f.fainelli@gmail.com, bcm-kernel-feedback-list@broadcom.com, Kamal Dasu Subject: [PATCH v4 2/2] mmc: add new sdhci reset sequence for brcm 74165b0 Date: Mon, 18 Dec 2023 16:07:05 -0500 Message-Id: <20231218210705.38201-3-kamal.dasu@broadcom.com> X-Mailer: git-send-email 2.17.1 In-Reply-To: <20231218210705.38201-1-kamal.dasu@broadcom.com> References: <20231218210705.38201-1-kamal.dasu@broadcom.com> Precedence: bulk X-Mailing-List: linux-mmc@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: From: Kamal Dasu 74165b0 shall use a new sdio controller core version which requires a different reset sequence. For core reset we use sdhci_reset. For CMD and/or DATA reset added a new function to also enable SDHCI clocks SDHCI_CLOCK_CARD_EN SDHCI_CLOCK_INT_EN along with the SDHCI_RESET_CMD and/or SDHCI_RESET_DATA fields. Signed-off-by: Kamal Dasu Reported-by: kernel test robot Closes: https://lore.kernel.org/oe-kbuild-all/202312091608.0VbkRxlh-lkp@intel.com/ Closes: https://lore.kernel.org/oe-kbuild-all/202312091905.UGzltx8A-lkp@intel.com/ --- drivers/mmc/host/sdhci-brcmstb.c | 67 +++++++++++++++++++++++++++++--- 1 file changed, 62 insertions(+), 5 deletions(-) diff --git a/drivers/mmc/host/sdhci-brcmstb.c b/drivers/mmc/host/sdhci-brcmstb.c index c23251bb95f3..7c5d04be93b3 100644 --- a/drivers/mmc/host/sdhci-brcmstb.c +++ b/drivers/mmc/host/sdhci-brcmstb.c @@ -6,6 +6,7 @@ */ #include +#include #include #include #include @@ -44,8 +45,13 @@ struct brcmstb_match_priv { static inline void enable_clock_gating(struct sdhci_host *host) { + struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host); + struct sdhci_brcmstb_priv *priv = sdhci_pltfm_priv(pltfm_host); u32 reg; + if (!(priv->flags & BRCMSTB_PRIV_FLAGS_GATE_CLOCK)) + return; + reg = sdhci_readl(host, SDHCI_VENDOR); reg |= SDHCI_VENDOR_GATE_SDCLK_EN; sdhci_writel(host, reg, SDHCI_VENDOR); @@ -53,14 +59,51 @@ static inline void enable_clock_gating(struct sdhci_host *host) static void brcmstb_reset(struct sdhci_host *host, u8 mask) { - struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host); - struct sdhci_brcmstb_priv *priv = sdhci_pltfm_priv(pltfm_host); - sdhci_and_cqhci_reset(host, mask); /* Reset will clear this, so re-enable it */ - if (priv->flags & BRCMSTB_PRIV_FLAGS_GATE_CLOCK) - enable_clock_gating(host); + enable_clock_gating(host); +} + +static void brcmstb_sdhci_reset_cmd_data(struct sdhci_host *host, u8 mask) +{ + int ret; + u32 reg; + u32 new_mask = (mask & (SDHCI_RESET_CMD | SDHCI_RESET_DATA)) << 24; + + /* + * SDHCI_CLOCK_CONTROL register CARD_EN and CLOCK_INT_EN bits shall + * be set along with SOFTWARE_RESET register RESET_CMD or RESET_DATA + * bits, hence access SDHCI_CLOCK_CONTROL register as 32-bit register + */ + new_mask |= SDHCI_CLOCK_CARD_EN | SDHCI_CLOCK_INT_EN; + reg = sdhci_readl(host, SDHCI_CLOCK_CONTROL); + sdhci_writel(host, reg | new_mask, SDHCI_CLOCK_CONTROL); + + reg = sdhci_readb(host, SDHCI_SOFTWARE_RESET); + ret = readb_poll_timeout(host->ioaddr + SDHCI_SOFTWARE_RESET, + reg, reg & mask, 10, 10000); + + if (ret) { + pr_err("%s: Reset 0x%x never completed.\n", + mmc_hostname(host->mmc), (int)mask); + sdhci_err_stats_inc(host, CTRL_TIMEOUT); + sdhci_dumpregs(host); + } +} + +static void brcmstb_reset_74165b0(struct sdhci_host *host, u8 mask) +{ + /* take care of RESET_ALL as usual */ + if (mask & SDHCI_RESET_ALL) + sdhci_and_cqhci_reset(host, SDHCI_RESET_ALL); + + /* cmd and/or data treated differently on this core */ + if (mask & (SDHCI_RESET_CMD | SDHCI_RESET_DATA)) + brcmstb_sdhci_reset_cmd_data(host, mask); + + /* Reset will clear this, so re-enable it */ + enable_clock_gating(host); } static void sdhci_brcmstb_hs400es(struct mmc_host *mmc, struct mmc_ios *ios) @@ -162,6 +205,13 @@ static struct sdhci_ops sdhci_brcmstb_ops_7216 = { .set_uhs_signaling = sdhci_brcmstb_set_uhs_signaling, }; +static struct sdhci_ops sdhci_brcmstb_ops_74165b0 = { + .set_clock = sdhci_brcmstb_set_clock, + .set_bus_width = sdhci_set_bus_width, + .reset = brcmstb_reset_74165b0, + .set_uhs_signaling = sdhci_brcmstb_set_uhs_signaling, +}; + static struct brcmstb_match_priv match_priv_7425 = { .flags = BRCMSTB_MATCH_FLAGS_NO_64BIT | BRCMSTB_MATCH_FLAGS_BROKEN_TIMEOUT, @@ -179,10 +229,17 @@ static const struct brcmstb_match_priv match_priv_7216 = { .ops = &sdhci_brcmstb_ops_7216, }; +static struct brcmstb_match_priv match_priv_74165b0 = { + .flags = BRCMSTB_MATCH_FLAGS_HAS_CLOCK_GATE, + .hs400es = sdhci_brcmstb_hs400es, + .ops = &sdhci_brcmstb_ops_74165b0, +}; + static const struct of_device_id __maybe_unused sdhci_brcm_of_match[] = { { .compatible = "brcm,bcm7425-sdhci", .data = &match_priv_7425 }, { .compatible = "brcm,bcm7445-sdhci", .data = &match_priv_7445 }, { .compatible = "brcm,bcm7216-sdhci", .data = &match_priv_7216 }, + { .compatible = "brcm,bcm74165b0-sdhci", .data = &match_priv_74165b0 }, {}, };