From mboxrd@z Thu Jan 1 00:00:00 1970 Delivery-date: Tue, 22 Apr 2025 07:27:16 +0200 Received: from metis.whiteo.stw.pengutronix.de ([2a0a:edc0:2:b01:1d::104]) by lore.white.stw.pengutronix.de with esmtps (TLS1.3) tls TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384 (Exim 4.96) (envelope-from ) id 1u76A8-003urT-03 for lore@lore.pengutronix.de; Tue, 22 Apr 2025 07:27:16 +0200 Received: from bombadil.infradead.org ([2607:7c80:54:3::133]) by metis.whiteo.stw.pengutronix.de with esmtps (TLS1.3:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.92) (envelope-from ) id 1u76A6-0004Ai-Dg for lore@pengutronix.de; Tue, 22 Apr 2025 07:27:15 +0200 DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20210309; h=Sender:List-Subscribe:List-Help :List-Post:List-Archive:List-Unsubscribe:List-Id:Content-Transfer-Encoding: MIME-Version:References:In-Reply-To:Message-Id:Date:Subject:Cc:To:From: Reply-To:Content-Type:Content-ID:Content-Description:Resent-Date:Resent-From: Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:List-Owner; bh=p9+JiE+GxJpqVbBddUNfleNRKGTkYf/NrFAp6CmrdEE=; b=cHeX4gIcBLHAbThKDvUlX71X1E BpcQlqmB6sCHRa/I582URyZGioE0N0kfyUatiAbL4A13R83XdWWF8Fa6mm2XBobgnCTikF3j12Ach KLUbdM4k/HVEj9SrVcoq4ZJTLJlERt2wncSuWMg78/HeYgGKxDd4ri7s8dl+TYtwGpYVerFbqOpHq hrONFuOy4hze/B8M1ZzJNsaPjfdMFhK9hEpAITkTwg99E4sN12OlioxRjTxoz+6PgnvPQcNrj009U VNPZlQvsaz9G7OgVcX/gcm+a55umDjBwRNK/i+iuR+8+g6bDDlagqPbevIUfNAlYMb7j//c1tTFz8 6R0Lq5AA==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.98.2 #2 (Red Hat Linux)) id 1u769c-00000005rDh-0NaX; Tue, 22 Apr 2025 05:26:44 +0000 Received: from metis.whiteo.stw.pengutronix.de ([2a0a:edc0:2:b01:1d::104]) by bombadil.infradead.org with esmtps (Exim 4.98.2 #2 (Red Hat Linux)) id 1u769X-00000005r9T-0NlN for barebox@lists.infradead.org; Tue, 22 Apr 2025 05:26:41 +0000 Received: from drehscheibe.grey.stw.pengutronix.de ([2a0a:edc0:0:c01:1d::a2]) by metis.whiteo.stw.pengutronix.de with esmtps (TLS1.3:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.92) (envelope-from ) id 1u769V-0003iw-Rt; Tue, 22 Apr 2025 07:26:37 +0200 Received: from dude05.red.stw.pengutronix.de ([2a0a:edc0:0:1101:1d::54]) by drehscheibe.grey.stw.pengutronix.de with esmtps (TLS1.3) tls TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384 (Exim 4.96) (envelope-from ) id 1u769V-001Uv7-25; Tue, 22 Apr 2025 07:26:37 +0200 Received: from localhost ([::1] helo=dude05.red.stw.pengutronix.de) by dude05.red.stw.pengutronix.de with esmtp (Exim 4.96) (envelope-from ) id 1u769V-00EN4R-1l; Tue, 22 Apr 2025 07:26:37 +0200 From: Ahmad Fatoum To: barebox@lists.infradead.org Cc: Ahmad Fatoum Date: Tue, 22 Apr 2025 07:26:30 +0200 Message-Id: <20250422052635.3423961-5-a.fatoum@pengutronix.de> X-Mailer: git-send-email 2.39.5 In-Reply-To: <20250422052635.3423961-1-a.fatoum@pengutronix.de> References: <20250422052635.3423961-1-a.fatoum@pengutronix.de> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20250421_222639_152356_CD02251E X-CRM114-Status: GOOD ( 21.21 ) X-BeenThere: barebox@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "barebox" X-SA-Exim-Connect-IP: 2607:7c80:54:3::133 X-SA-Exim-Mail-From: barebox-bounces+lore=pengutronix.de@lists.infradead.org X-Spam-Checker-Version: SpamAssassin 3.4.2 (2018-09-13) on metis.whiteo.stw.pengutronix.de X-Spam-Level: X-Spam-Status: No, score=-5.6 required=4.0 tests=AWL,BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS, MAILING_LIST_MULTI,RCVD_IN_DNSWL_MED,SPF_HELO_NONE,SPF_NONE autolearn=unavailable autolearn_force=no version=3.4.2 Subject: [PATCH 4/9] mci: add common PBL helper for chainloading after BootROM initialization X-SA-Exim-Version: 4.2.1 (built Wed, 08 May 2019 21:11:16 +0000) X-SA-Exim-Scanned: Yes (on metis.whiteo.stw.pengutronix.de) We have a number of PBL drivers that communicate directly with a SD-Card or eMMC already initialized by the BootROM and put into transfer state. This lets us skip having a stripped down MMC framework in the prebootloader. Instead of duplicating this code across drivers, let's put the duplicate code into a common location. Signed-off-by: Ahmad Fatoum --- drivers/mci/Makefile | 1 + drivers/mci/mci-pbl.c | 110 ++++++++++++++++++++++++++++++++++++++++++ include/pbl/mci.h | 37 ++++++++++++++ 3 files changed, 148 insertions(+) create mode 100644 drivers/mci/mci-pbl.c create mode 100644 include/pbl/mci.h diff --git a/drivers/mci/Makefile b/drivers/mci/Makefile index d3df4c1bb650..8f54107e46c1 100644 --- a/drivers/mci/Makefile +++ b/drivers/mci/Makefile @@ -1,5 +1,6 @@ # SPDX-License-Identifier: GPL-2.0-only obj-$(CONFIG_MCI) += mci-core.o +pbl-$(CONFIG_MCI) += mci-pbl.o obj-$(CONFIG_MCI_MMC_RPMB) += rpmb.o obj-$(CONFIG_MCI_AM654) += am654-sdhci.o obj-$(CONFIG_MCI_ARASAN) += arasan-sdhci.o diff --git a/drivers/mci/mci-pbl.c b/drivers/mci/mci-pbl.c new file mode 100644 index 000000000000..b58cd8dafe84 --- /dev/null +++ b/drivers/mci/mci-pbl.c @@ -0,0 +1,110 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* + * This code assumes that the SD/eMMC is already in transfer mode, + * because it card initialization has been done by the BootROM. + * + * In interest of reducing complexity, code size and boot time, we + * don't want to reset the card, but reuse it as-is. + * + * Full reinitialization of the card has to wait until we are + * in barebox proper (see mci-core.c). + */ + +#define pr_fmt(fmt) "mci-pbl: " fmt + +#include +#include +#include +#include +#include + +#define MCI_PBL_BLOCK_LEN 512 + +static int pbl_mci_read_blocks(struct pbl_mci *mci, void *dst, + off_t start, unsigned int nblocks) +{ + struct mci_cmd cmd = {}; + struct mci_data data; + int ret; + + if (mci->capacity == PBL_MCI_STANDARD_CAPACITY) + start *= MCI_PBL_BLOCK_LEN; + + mci_setup_cmd(&cmd, MMC_CMD_READ_SINGLE_BLOCK, + start, MMC_RSP_R1); + if (nblocks > 1) + cmd.cmdidx = MMC_CMD_READ_MULTIPLE_BLOCK; + + data.dest = dst; + data.flags = MMC_DATA_READ; + data.blocksize = MCI_PBL_BLOCK_LEN; + data.blocks = nblocks; + + ret = pbl_mci_send_cmd(mci, &cmd, &data); + if (ret || nblocks > 1) { + mci_setup_cmd(&cmd, MMC_CMD_STOP_TRANSMISSION, 0, + MMC_RSP_R1b); + pbl_mci_send_cmd(mci, &cmd, NULL); + } + + return ret; +} + +static int pbl_bio_mci_read(struct pbl_bio *bio, off_t start, + void *buf, unsigned int nblocks) +{ + struct pbl_mci *mci = bio->priv; + unsigned int count = 0; + unsigned int block_len = MCI_PBL_BLOCK_LEN; + int ret; + + while (count < nblocks) { + unsigned n = nblocks - count; + + if (mci->max_blocks_per_read) + n = min(n, mci->max_blocks_per_read); + + ret = pbl_mci_read_blocks(mci, buf, start, n); + if (ret < 0) + return ret; + + count += n; + start += n; + buf += n *block_len; + } + + return count; +} + +static const char *capacity_tostr(enum pbl_mci_capacity capacity) +{ + switch (capacity) { + case PBL_MCI_STANDARD_CAPACITY: + return "standard"; + case PBL_MCI_HIGH_CAPACITY: + return "high/extended"; + case PBL_MCI_ULTRA_CAPACITY: + return "ultra"; + case PBL_MCI_RESERVED_CAPACITY: + return "reserved"; + case PBL_MCI_UNKNOWN_CAPACITY: + break; + } + + return "unknown"; +} + +int pbl_mci_bio_init(struct pbl_mci *mci, struct pbl_bio *bio) +{ + + if (mci->capacity == PBL_MCI_UNKNOWN_CAPACITY) + BUG(); + else + pr_debug("assuming %s capacity card\n", + capacity_tostr(mci->capacity)); + + bio->priv = mci; + bio->read = pbl_bio_mci_read; + + return 0; +} diff --git a/include/pbl/mci.h b/include/pbl/mci.h new file mode 100644 index 000000000000..dd4fcac5412b --- /dev/null +++ b/include/pbl/mci.h @@ -0,0 +1,37 @@ +/* SPDX-License-Identifier: GPL-2.0-only */ +#ifndef __PBL_MCI_H__ +#define __PBL_MCI_H__ + +#include +#include + +struct mci_cmd; +struct mci_data; +struct pbl_bio; + +enum pbl_mci_capacity { + PBL_MCI_UNKNOWN_CAPACITY, + PBL_MCI_STANDARD_CAPACITY, + PBL_MCI_HIGH_CAPACITY, /* and extended */ + PBL_MCI_ULTRA_CAPACITY, + PBL_MCI_RESERVED_CAPACITY, +}; + +struct pbl_mci { + void *priv; + enum pbl_mci_capacity capacity; + unsigned max_blocks_per_read; + int (*send_cmd)(struct pbl_mci *mci, struct mci_cmd *cmd, + struct mci_data *data); +}; + +static inline int pbl_mci_send_cmd(struct pbl_mci *mci, + struct mci_cmd *cmd, + struct mci_data *data) +{ + return mci->send_cmd(mci, cmd, data); +} + +int pbl_mci_bio_init(struct pbl_mci *mci, struct pbl_bio *bio); + +#endif /* __PBL_MCI_H__ */ -- 2.39.5