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a=rsa-sha256; c=relaxed/simple; d=csh.rit.edu; h= content-transfer-encoding:mime-version:references:in-reply-to :x-mailer:message-id:date:date:subject:subject:from:from :received:received; s=mail; t=1722528383; x=1724342784; bh=VemMu g0dFCXAOFQuIvo8p1qQiSxX6hFoAON1+wYMAVg=; b=lrJCD/O+5G3aF29M3RVqS FrVvQzRxX+9GYmE+EDv6ieCoBvYZdCrYKXSGtBPUQX+QfUnjQgFilLT9XKDqk1cm iU15AVT6GvHuKRkFWGjgzBeUetFqoORIc2DYdnLHdxuG7sdHVW6KSFfTG/a5ujmq kMs9bjqe891TB5S3SAb7vk= X-Virus-Scanned: amavisd-new at csh.rit.edu Received: from greygoose-centos7.csh.rit.edu ([127.0.0.1]) by localhost (mail.csh.rit.edu [127.0.0.1]) (amavisd-new, port 10026) with ESMTP id hsz1rX93ZNNR; Thu, 1 Aug 2024 12:06:23 -0400 (EDT) Received: from freedom.csh.rit.edu (freedom.csh.rit.edu [129.21.49.182]) by greygoose-centos7.csh.rit.edu (Postfix) with ESMTP id 140A7456D905; Thu, 1 Aug 2024 12:06:23 -0400 (EDT) From: Mary Strodl To: linux-kernel@vger.kernel.org Cc: akpm@linux-foundation.org, urezki@gmail.com, hch@infradead.org, linux-mm@kvack.org, lee@kernel.org, andi.shyti@kernel.org, linux-i2c@vger.kernel.org, s.hauer@pengutronix.de, christian.gmeiner@gmail.com, Mary Strodl Subject: [PATCH v2 2/2] i2c: Add Congatec CGEB I2C driver Date: Thu, 1 Aug 2024 12:06:10 -0400 Message-ID: <20240801160610.101859-3-mstrodl@csh.rit.edu> X-Mailer: git-send-email 2.45.2 In-Reply-To: <20240801160610.101859-1-mstrodl@csh.rit.edu> References: <20240801160610.101859-1-mstrodl@csh.rit.edu> MIME-Version: 1.0 X-Rspam-User: X-Rspamd-Queue-Id: 28FF3A003A X-Rspamd-Server: rspam01 X-Stat-Signature: 376poqoswmhec4c1frauf8huujwjwi9k X-HE-Tag: 1722528384-208717 X-HE-Meta: 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 0DLQfjw9 58ofikYPhiYtvNwvvjnsEtGhCg1ZGY9q5zOONivTowXutIQztcfZS/uUM0P9WvjK0BAnUX2jJ/fkre0strPUOQquu8oIRiJ2sJxpKNWUfYnbewYM9cJoQRFpyAZZMwVu0kEjBY3tq6AE+RrM95QcwX1GiRXMAEiirtXKvBrxCpKjsUKjixHQ89sS2GtpZSPzM/t3gRFb8WINF2ii8o+Em5TBtgg== X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: From: Sascha Hauer This driver provides a I2C bus driver for the CGEB interface found on some Congatec x86 modules. No devices are registered on the bus, the user has to do this via the i2c device /sys interface. Signed-off-by: Sascha Hauer Signed-off-by: Christian Gmeiner Signed-off-by: Mary Strodl --- drivers/i2c/busses/Kconfig | 7 + drivers/i2c/busses/Makefile | 1 + drivers/i2c/busses/i2c-congatec-cgeb.c | 189 +++++++++++++++++++++++++ 3 files changed, 197 insertions(+) create mode 100644 drivers/i2c/busses/i2c-congatec-cgeb.c diff --git a/drivers/i2c/busses/Kconfig b/drivers/i2c/busses/Kconfig index fe6e8a1bb607..504a0be54f04 100644 --- a/drivers/i2c/busses/Kconfig +++ b/drivers/i2c/busses/Kconfig @@ -1261,6 +1261,13 @@ config I2C_RCAR This driver can also be built as a module. If so, the module will be called i2c-rcar. +config I2C_CONGATEC_CGEB + tristate "Congatec CGEB I2C driver" + depends on MFD_CONGATEC_CGEB + help + This driver provides support for the I2C busses accssable via + the Congatec CGEB interface found on Congatec boards. + comment "External I2C/SMBus adapter drivers" config I2C_DIOLAN_U2C diff --git a/drivers/i2c/busses/Makefile b/drivers/i2c/busses/Makefile index 78d0561339e5..f4e9fa7542be 100644 --- a/drivers/i2c/busses/Makefile +++ b/drivers/i2c/busses/Makefile @@ -128,6 +128,7 @@ obj-$(CONFIG_I2C_XILINX) += i2c-xiic.o obj-$(CONFIG_I2C_XLP9XX) += i2c-xlp9xx.o obj-$(CONFIG_I2C_RCAR) += i2c-rcar.o obj-$(CONFIG_I2C_GXP) += i2c-gxp.o +obj-$(CONFIG_I2C_CONGATEC_CGEB) += i2c-congatec-cgeb.o # External I2C/SMBus adapter drivers obj-$(CONFIG_I2C_DIOLAN_U2C) += i2c-diolan-u2c.o diff --git a/drivers/i2c/busses/i2c-congatec-cgeb.c b/drivers/i2c/busses/i2c-congatec-cgeb.c new file mode 100644 index 000000000000..5afee15ebdb3 --- /dev/null +++ b/drivers/i2c/busses/i2c-congatec-cgeb.c @@ -0,0 +1,189 @@ +/* + * CGEB i2c driver + * + * (c) 2011 Sascha Hauer, Pengutronix + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation; version 2 of the License. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + */ +#include +#include +#include +#include +#include + +#define CG_I2C_FLAG_START 0x00080 /* send START condition */ +#define CG_I2C_FLAG_STOP 0x00040 /* send STOP condition */ +#define CG_I2C_FLAG_ALL_ACK 0x08000 /* send ACK on all read bytes */ +#define CG_I2C_FLAG_ALL_NAK 0x04000 /* send NAK on all read bytes */ + +struct cgeb_i2c_priv { + struct cgeb_board_data *board; + struct i2c_adapter adapter; + int unit; +}; + +static u32 cgeb_i2c_func(struct i2c_adapter *adapter) +{ + return I2C_FUNC_I2C | I2C_FUNC_SMBUS_EMUL; +} + +static int cgeb_i2c_set_speed(struct cgeb_i2c_priv *priv, int speed) +{ + struct cgeb_function_parameters fps; + + memset(&fps, 0, sizeof(fps)); + + fps.unit = priv->unit; + fps.pars[0] = speed; + + return cgeb_call(priv->board, &fps, CgebI2CSetFrequency); +} + +static int cgeb_i2c_xfer(struct i2c_adapter *adapter, + struct i2c_msg *msgs, int num) +{ + struct cgeb_function_parameters fps; + int i, ret; + unsigned long flags = CG_I2C_FLAG_START; + struct cgeb_i2c_priv *priv = i2c_get_adapdata(adapter); + unsigned long rdlen, wrlen; + unsigned char *rdbuf, *wrbuf, *raw_wrbuf; + unsigned short lmax = 0; + + /* + * With cgeb the I2C address is part of the write data + * buffer, so allocate a buffer with the length of the + * longest write buffer + 1 + */ + for (i = 0; i < num; i++) + if (!(msgs[i].flags & I2C_M_RD)) + lmax = max(lmax, msgs[i].len); + + raw_wrbuf = kmalloc(lmax + 1, GFP_KERNEL); + if (!raw_wrbuf) + return -ENOMEM; + + for (i = 0; i < num; i++) { + if (msgs[i].flags & I2C_M_RD) { + rdbuf = msgs[i].buf; + rdlen = msgs[i].len; + wrbuf = NULL; + wrlen = 0; + } else { + rdbuf = NULL; + rdlen = 0; + wrbuf = msgs[i].buf; + wrlen = msgs[i].len; + } + + raw_wrbuf[0] = msgs[i].addr << 1; + if (wrlen) + memcpy(&raw_wrbuf[1], wrbuf, wrlen); + + if (msgs[i].flags & I2C_M_RD) + raw_wrbuf[0] |= 1; + + if (i == num - 1) + flags |= CG_I2C_FLAG_STOP; + + dev_dbg(&adapter->dev, + "%s: rd: %p/%ld wr: %p/%ld flags: 0x%08lx %s\n", + __func__, rdbuf, rdlen, raw_wrbuf, wrlen + 1, + flags, + msgs[i].flags & I2C_M_RD ? "READ" : "WRITE"); + + memset(&fps, 0, sizeof(fps)); + + fps.unit = priv->unit; + fps.pars[0] = wrlen + 1; + fps.pars[1] = rdlen; + fps.pars[2] = flags; + fps.iptr = raw_wrbuf; + fps.optr = rdbuf; + fps.optr_size = sizeof(*rdbuf) * rdlen; + fps.iptr_size = (wrlen + 1) * sizeof(*raw_wrbuf); + + ret = cgeb_call(priv->board, &fps, CgebI2CTransfer); + if (ret) { + ret = -EREMOTEIO; + goto out; + } + } + + ret = num; + +out: + kfree(raw_wrbuf); + + return ret; +} + +static struct i2c_algorithm cgeb_i2c_algo = { + .master_xfer = cgeb_i2c_xfer, + .functionality = cgeb_i2c_func, +}; + +static int cgeb_i2c_probe(struct platform_device *pdev) +{ + struct cgeb_i2c_priv *priv; + struct cgeb_pdata *pdata = pdev->dev.platform_data; + int ret; + + priv = devm_kzalloc(&pdev->dev, sizeof(*priv), GFP_KERNEL); + if (!priv) + return -ENOMEM; + + strcpy(priv->adapter.name, pdev->name); + priv->adapter.owner = THIS_MODULE; + priv->adapter.algo = &cgeb_i2c_algo; + priv->adapter.dev.parent = &pdev->dev; + priv->unit = pdata->unit; + priv->board = pdata->board; + i2c_set_adapdata(&priv->adapter, priv); + + platform_set_drvdata(pdev, priv); + + ret = cgeb_i2c_set_speed(priv, 400000); + if (ret) + /* not a critical error, we can continue with the default speed. */ + dev_warn(&pdev->dev, "Could not set speed to 400KHz\n"); + + ret = i2c_add_adapter(&priv->adapter); + if (ret < 0) { + dev_err(&pdev->dev, "registration failed\n"); + return ret; + } + + dev_info(&pdev->dev, "registered\n"); + + return 0; +}; + +static int cgeb_i2c_remove(struct platform_device *pdev) +{ + struct cgeb_i2c_priv *priv = platform_get_drvdata(pdev); + + i2c_del_adapter(&priv->adapter); + + return 0; +} + +static struct platform_driver cgeb_i2c_driver = { + .probe = cgeb_i2c_probe, + .remove = cgeb_i2c_remove, + .driver = { + .name = "cgeb-i2c", + }, +}; +module_platform_driver(cgeb_i2c_driver); + +MODULE_AUTHOR("Sascha Hauer "); +MODULE_DESCRIPTION("cgeb i2c driver"); +MODULE_LICENSE("GPL");