From patchwork Wed Dec 20 15:30:31 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Kamal Dasu X-Patchwork-Id: 13500264 Received: from mail-pl1-f170.google.com (mail-pl1-f170.google.com [209.85.214.170]) (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 60EE04175E for ; Wed, 20 Dec 2023 15:30:59 +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="cXwGwq3c" Received: by mail-pl1-f170.google.com with SMTP id d9443c01a7336-1d3dc30ae01so15695655ad.0 for ; Wed, 20 Dec 2023 07:30:59 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=broadcom.com; s=google; t=1703086259; x=1703691059; 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=1nclP1dvScBDCCWZuRMW5wF/mHm+q7ShfpsU0nQOeYA=; b=cXwGwq3cr7toF9hfFWXI9fMj6g6tNajjUJWV8I7u4W1F4e2kGvp1EOdgC8z1lYRzDd f5FIn/eGh1TYDP9V/7mgtkzYc0XgZVJCXG/CNJCFrJnmiTyIfFT74IUJSTZ9cSQWoGSd 4UfD4tbb0I1fWiZ/VuIb3JVWvWr+HqaNY9De4= X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1703086259; x=1703691059; 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=1nclP1dvScBDCCWZuRMW5wF/mHm+q7ShfpsU0nQOeYA=; b=J3sBhaLnLPSI5tQNLqNTNqEgOtN2H1B3C863nFRuOX/f4taqlq9DXVHU9Kj86uDNo7 CfV8BpzvTisdFLEJ0qq+WdqJ2ezZPwUQSmKVdRekyB02BtHhWn0WxNS3qPQ3mGK6iCml YyGEa234mXI1OMZ+FQ9RNyqCzOlkwfVOXF4MSD/D544TJ5fqvzAhFlvcUaGAFQFgmpcx b1Sw+CO8g0D6mbHl8xdX0tEW+tnGepCPF8QLamhwF3Bqfr3gAF5ZT5JF1T3dArJwPbe6 BcjKbsXyZh2q43LEHZswSOPRXqPnrVDko2PX6M+AFm7vmhs6npbj7LV2P7PwQQsRdHUb kxCg== X-Gm-Message-State: AOJu0YzdJJVsu6StKUbUTrWXSvgMTd4zjENqamGFLnHssFhSIHt1lCt9 ZzuyRkuf+lLZpTTh8RyqqrhKcDhS2tHt74Eq0BUY9A== X-Google-Smtp-Source: AGHT+IHmI57AM6COdTuVhvZ8RBlBwuAuD6MwVuSN6j/lELwmir+kVh/bfwCbJGbmBKnSzO9VWKAevQ== X-Received: by 2002:a17:902:868f:b0:1d3:b308:adb8 with SMTP id g15-20020a170902868f00b001d3b308adb8mr5178828plo.17.1703086258642; Wed, 20 Dec 2023 07:30:58 -0800 (PST) Received: from mail.broadcom.net ([192.19.144.250]) by smtp.gmail.com with ESMTPSA id j15-20020a170903024f00b001d0b080c7e6sm23041395plh.208.2023.12.20.07.30.56 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 20 Dec 2023 07:30:57 -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 v6 2/2] mmc: add new sdhci reset sequence for brcm 74165b0 Date: Wed, 20 Dec 2023 10:30:31 -0500 Message-Id: <20231220153031.38678-3-kamal.dasu@broadcom.com> X-Mailer: git-send-email 2.17.1 In-Reply-To: <20231220153031.38678-1-kamal.dasu@broadcom.com> References: <20231220153031.38678-1-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 --- 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..f171980b014e 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_atomic(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 }, {}, };