From patchwork Thu Aug 8 18:35:25 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Mary Strodl X-Patchwork-Id: 817766 Received: from greygoose-centos7.csh.rit.edu (greygoose-centos7.csh.rit.edu [129.21.49.170]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id CB648155C8E; Thu, 8 Aug 2024 18:36:09 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=129.21.49.170 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1723142172; cv=none; b=VRd+yKWycEkJqR4nfoSSjng1LeN9uMAGnMhlVJTWTyytrFhI2C3GmdAcBZSLMd6ELiClTRlDJX5utNCYO2lKdX8rA8ZP9PUar/o9AWcBW/shAKI/KDzYl/6HgEs6I7jqbTGI7kpAWagwCl0M5Y6EFWaaFGtrwXJLFgVngwfXkQg= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1723142172; c=relaxed/simple; bh=mnS8zfRygln6okJaBL28T6E/aJMdyrzM+P3bicblCFw=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=rSs9nhyrVuDyND68WUc3iA9pZgXLnU34lt7Yba6UrBKTbHEjZBeHQ6KfEk+HWRySWlMSnmM3z7msbk61581BSUCb1R563GBp43YNEbvCZPJsQcCqWz/ub6iB8BHMf5z89d7LePL9xWHnkbYGt2aVw/ImDUnKS6MDrOfPiUfYhsA= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=csh.rit.edu; spf=pass smtp.mailfrom=csh.rit.edu; dkim=pass (1024-bit key) header.d=csh.rit.edu header.i=@csh.rit.edu header.b=kTnx281p; arc=none smtp.client-ip=129.21.49.170 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=csh.rit.edu Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=csh.rit.edu Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=csh.rit.edu header.i=@csh.rit.edu header.b="kTnx281p" Received: from localhost (localhost [127.0.0.1]) by greygoose-centos7.csh.rit.edu (Postfix) with ESMTP id C6CA0456D414; Thu, 8 Aug 2024 14:36:02 -0400 (EDT) Authentication-Results: mail.csh.rit.edu (amavisd-new); dkim=pass (1024-bit key) reason="pass (just generated, assumed good)" header.d=csh.rit.edu DKIM-Signature: v=1; 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=1723142161; x=1724956562; bh=mnS8z fRygln6okJaBL28T6E/aJMdyrzM+P3bicblCFw=; b=kTnx281pMiHvCx0A9l4Vs tHoX1QiW3OHzQFpr56DDkZd+eoR5PR9QOSsmbjtYoj58VBlsqTQQbeyB2fv0Zgys +qOUoXoGDj5ZDAjpAK+an3gyA5C7vW20poDzgf7n+pERSCufgOKUFg1QNLYCLFov RbTzNAmiRa/zbsLUvPSE1k= 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 jlW67Qj4z9RU; Thu, 8 Aug 2024 14:36:01 -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 88F9B413F756; Thu, 8 Aug 2024 14:36:00 -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 v3 1/2] x86: Add basic support for the Congatec CGEB BIOS interface Date: Thu, 8 Aug 2024 14:35:25 -0400 Message-ID: <20240808183527.3950120-2-mstrodl@csh.rit.edu> X-Mailer: git-send-email 2.45.2 In-Reply-To: <20240808183527.3950120-1-mstrodl@csh.rit.edu> References: <20240808183527.3950120-1-mstrodl@csh.rit.edu> Precedence: bulk X-Mailing-List: linux-i2c@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 The Congatec CGEB is a BIOS interface found on some Congatec x86 modules. It provides access to on board peripherals like I2C busses and watchdogs. This driver contains the basic support for accessing the CGEB interface and registers the child devices. Signed-off-by: Sascha Hauer Signed-off-by: Christian Gmeiner Signed-off-by: Mary Strodl --- drivers/mfd/Kconfig | 10 + drivers/mfd/Makefile | 1 + drivers/mfd/congatec-cgeb.c | 1138 +++++++++++++++++++++++++++++ include/linux/mfd/congatec-cgeb.h | 112 +++ include/uapi/linux/connector.h | 4 +- 5 files changed, 1264 insertions(+), 1 deletion(-) create mode 100644 drivers/mfd/congatec-cgeb.c create mode 100644 include/linux/mfd/congatec-cgeb.h diff --git a/drivers/mfd/Kconfig b/drivers/mfd/Kconfig index 266b4f54af60..fa06a9dc34f9 100644 --- a/drivers/mfd/Kconfig +++ b/drivers/mfd/Kconfig @@ -1206,6 +1206,16 @@ config MFD_RT5120 is targeted at providing the CPU voltage, memory, I/O and peripheral power rails in home entertainment devices. +config MFD_CONGATEC_CGEB + tristate "Support for the Congatec CGEB BIOS interface" + depends on X86 + help + The Congatec CGEB BIOS interface provides access to onboard + peripherals like I2C busses and watchdogs. additional drivers must be + enabled in order to use the functionality of the device. + Say y or m here if you are using a congatec module with CGEB interface, + otherwise say n. + config MFD_RC5T583 bool "Ricoh RC5T583 Power Management system device" depends on I2C=y diff --git a/drivers/mfd/Makefile b/drivers/mfd/Makefile index c66f07edcd0e..38f31841ac88 100644 --- a/drivers/mfd/Makefile +++ b/drivers/mfd/Makefile @@ -217,6 +217,7 @@ obj-$(CONFIG_MFD_INTEL_LPSS) += intel-lpss.o obj-$(CONFIG_MFD_INTEL_LPSS_PCI) += intel-lpss-pci.o obj-$(CONFIG_MFD_INTEL_LPSS_ACPI) += intel-lpss-acpi.o obj-$(CONFIG_MFD_INTEL_PMC_BXT) += intel_pmc_bxt.o +obj-$(CONFIG_MFD_CONGATEC_CGEB) += congatec-cgeb.o obj-$(CONFIG_MFD_PALMAS) += palmas.o obj-$(CONFIG_MFD_VIPERBOARD) += viperboard.o obj-$(CONFIG_MFD_NTXEC) += ntxec.o diff --git a/drivers/mfd/congatec-cgeb.c b/drivers/mfd/congatec-cgeb.c new file mode 100644 index 000000000000..4ad0ce17fe07 --- /dev/null +++ b/drivers/mfd/congatec-cgeb.c @@ -0,0 +1,1138 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* + * CGEB driver + * + * Copyright (c) 2024 Mary Strodl + * + * Based on code from Congatec AG and Sascha Hauer + * + * CGEB is a BIOS interface found on congatech modules. It consists of + * code found in the BIOS memory map which is called in a ioctl like + * fashion. This file contains the basic driver for this interface + * which provides access to the GCEB interface and registers the child + * devices like I2C busses and watchdogs. + * + * 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 +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include + +#include + +#define CGOS_BOARD_MAX_SIZE_ID_STRING 16 + +#define CGEB_VERSION_MAJOR 1 + +#define CGEB_GET_VERSION_MAJOR(v) (((unsigned long)(v)) >> 24) + +/* CGEB Low Descriptor located in 0xc0000-0xfffff */ +#define CGEB_LD_MAGIC "$CGEBLD$" + +#pragma pack(push, 4) + +struct cgeb_low_desc { + char magic[8]; /* descriptor magic string */ + u16 size; /* size of this descriptor */ + u16 reserved; + char bios_name[8]; /* BIOS name and revision "ppppRvvv" */ + u32 hi_desc_phys_addr; /* phys addr of the high descriptor, can be 0 */ +}; + +/* CGEB High Descriptor located in 0xfff00000-0xffffffff */ +#ifdef CONFIG_X86_64 +#define CGEB_HD_MAGIC "$CGEBQD$" +#else +#define CGEB_HD_MAGIC "$CGEBHD$" +#endif + +struct cgeb_high_desc { + char magic[8]; /* descriptor magic string */ + u16 size; /* size of this descriptor */ + u16 reserved; + u32 data_size; /* CGEB data area size */ + u32 code_size; /* CGEB code area size */ + u32 entry_rel; /* CGEB entry point relative to start */ +}; + +struct cgeb_far_ptr { + void __user *off; + u16 seg; + u16 pad; +}; + +struct cgeb_fps { + u32 size; /* size of the parameter structure */ + u32 fct; /* function number */ + struct cgeb_far_ptr data; /* CGEB data area */ + void __user *cont; /* private continuation pointer */ + void __user *subfps; /* private sub function parameter + * structure pointer + */ + void __user *subfct; /* sub function pointer */ + u32 status; /* result codes of the function */ + u32 unit; /* unit number or type */ + u32 pars[4]; /* input parameters */ + u32 rets[2]; /* return parameters */ + void __user *iptr; /* input pointer */ + void __user *optr; /* output pointer */ +}; + +/* continuation status codes */ +#define CGEB_SUCCESS 0 +#define CGEB_NEXT 1 +#define CGEB_DELAY 2 +#define CGEB_NOIRQS 3 + +#define CGEB_DBG_STR 0x100 +#define CGEB_DBG_HEX 0x101 +#define CGEB_DBG_DEC 0x102 + +struct cgeb_map_mem { + void *phys; /* physical address */ + u32 size; /* size in bytes */ + struct cgeb_far_ptr virt; +}; + +struct cgeb_map_mem_list { + u32 count; /* number of memory map entries */ + struct cgeb_map_mem entries[]; +}; + +struct cgeb_boardinfo { + u32 size; + u32 flags; + u32 classes; + u32 primary_class; + char board[CGOS_BOARD_MAX_SIZE_ID_STRING]; + /* optional */ + char vendor[CGOS_BOARD_MAX_SIZE_ID_STRING]; +}; + +struct cgeb_i2c_info { + u32 size; + u32 type; + u32 frequency; + u32 maxFrequency; +}; + +#pragma pack(pop) + +/* I2C Types */ +#define CGEB_I2C_TYPE_UNKNOWN 0 +#define CGEB_I2C_TYPE_PRIMARY 1 +#define CGEB_I2C_TYPE_SMB 2 +#define CGEB_I2C_TYPE_DDC 3 +#define CGEB_I2C_TYPE_BC 4 + +struct cgeb_board_data { + void __user *data; + void __user *code; + size_t code_size; + u16 ds; + struct cgeb_map_mem_list *map_mem; + void __user *map_mem_user; + struct platform_device **devices; + int num_devices; + + #ifdef CONFIG_X86_64 + void (*entry)(void*, struct cgeb_fps *, struct cgeb_fps *, void*); + #else + /* + * entry points to a bimodal C style function that expects a far pointer + * to a fps. If cs is 0 then it does a near return, otherwise a far + * return. If we ever need a far return then we must not pass cs at all. + * parameters are removed by the caller. + */ + void __attribute__((regparm(0)))(*entry)(unsigned short, + struct cgeb_fps *, unsigned short); + #endif +}; + +struct cgeb_call_user { + void *optr; + size_t size; + void *callback_data; + int (*callback)(void __user *optr, void *koptr, void *data); +}; + +enum cgeb_msg_type { + CGEB_MSG_ACK = 0, + CGEB_MSG_ERROR, + CGEB_MSG_FPS, + CGEB_MSG_MAPPED, + CGEB_MSG_MAP, + CGEB_MSG_CODE, + CGEB_MSG_ALLOC, + CGEB_MSG_ALLOC_CODE, + CGEB_MSG_FREE, + CGEB_MSG_MUNMAP, + CGEB_MSG_CALL, + CGEB_MSG_PING, +}; + +struct cgeb_msg { + enum cgeb_msg_type type; + union { + struct cgeb_msg_mapped { + void __user *virt; + } mapped; + struct cgeb_msg_fps { + size_t optr_size; + void __user *optr; + struct cgeb_fps fps; + } fps; + struct cgeb_msg_code { + size_t length; + uint32_t entry_rel; + void __user *data; + } code; + struct cgeb_msg_map { + uint32_t phys; + size_t size; + } map; + }; +}; + +static char cgeb_helper_path[PATH_MAX] = "/sbin/cgeb-helper"; + +static struct cb_id cgeb_cn_id = { + .idx = CN_IDX_CGEB, + .val = CN_VAL_CGEB +}; + +enum cgeb_request_state { + CGEB_REQ_IDLE = 0, + CGEB_REQ_ACTIVE, + CGEB_REQ_DONE, +}; + +static DEFINE_MUTEX(cgeb_lock); +struct cgeb_request { + struct completion done; + struct cgeb_msg *out; + enum cgeb_request_state busy; + int ack; + int (*callback)(struct cgeb_msg *msg, void *user); + void *user; +}; + +#define CGEB_REQUEST_MAX 16 +static struct cgeb_request cgeb_requests[CGEB_REQUEST_MAX]; + +struct cgeb_after_alloc_data { + void *kernel; + void __user **user; + size_t length; +}; + +struct cgeb_map_data { + void __user *user_list; + struct cgeb_board_data *board; +}; + +static int cgeb_helper_start(void) +{ + char *envp[] = { + NULL, + }; + + char *argv[] = { + cgeb_helper_path, + NULL, + }; + + return call_usermodehelper(cgeb_helper_path, argv, envp, UMH_WAIT_EXEC); +} + +static int cgeb_request(struct cgeb_msg msg, struct cgeb_msg *out, + int (*callback)(struct cgeb_msg*, void*), void *user) +{ + static int seq; + struct cn_msg *wrapper; + struct cgeb_request *req; + int err, retries = 0; + + wrapper = kzalloc(sizeof(*wrapper) + sizeof(msg), GFP_KERNEL); + if (!wrapper) + return -ENOMEM; + + memset(wrapper, 0, sizeof(*wrapper)); + memcpy(&wrapper->id, &cgeb_cn_id, sizeof(cgeb_cn_id)); + + wrapper->len = sizeof(msg); + wrapper->ack = get_random_u32(); + memcpy(wrapper + 1, &msg, sizeof(msg)); + + mutex_lock(&cgeb_lock); + + req = &cgeb_requests[seq]; + + if (req->busy) { + mutex_unlock(&cgeb_lock); + err = -EBUSY; + goto out; + } + wrapper->seq = seq; + req->busy = CGEB_REQ_ACTIVE; + req->ack = wrapper->ack; + req->out = out; + req->callback = callback; + req->user = user; + + err = cn_netlink_send(wrapper, 0, 0, GFP_KERNEL); + if (err == -ESRCH) { + err = cgeb_helper_start(); + if (err) { + pr_err("failed to execute %s\n", cgeb_helper_path); + pr_err("make sure the cgeb helper is executable\n"); + } else { + do { + err = cn_netlink_send(wrapper, 0, 0, + GFP_KERNEL); + if (err == -ENOBUFS) + err = 0; + if (err == -ESRCH) + msleep(30); + } while (err == -ESRCH && ++retries < 5); + } + } else if (err == -ENOBUFS) + err = 0; + + kfree(wrapper); + + if (++seq >= CGEB_REQUEST_MAX) + seq = 0; + + mutex_unlock(&cgeb_lock); + + if (err) + goto out; + + /* Wait for a response to the request */ + err = wait_for_completion_interruptible_timeout( + &req->done, msecs_to_jiffies(20000)); + if (err == 0) { + pr_err("CGEB: Timed out running request of type %d!\n", + msg.type); + err = -ETIMEDOUT; + } else if (err > 0) + err = 0; + + if (err) + goto out; + + mutex_lock(&cgeb_lock); + + if (req->busy != CGEB_REQ_DONE) { + pr_err("CGEB: BUG: Request is in a bad state?\n"); + err = -EINVAL; + } + + req->busy = CGEB_REQ_IDLE; + mutex_unlock(&cgeb_lock); +out: + return err; +} + +static void cgeb_cn_callback(struct cn_msg *msg, struct netlink_skb_parms *nsp) +{ + struct cgeb_request *req; + + if (!capable(CAP_SYS_ADMIN)) + return; + + if (msg->seq >= CGEB_REQUEST_MAX) { + pr_err("CGEB: Impossible sequence number: %d! Ignoring\n", + msg->seq); + return; + } + + mutex_lock(&cgeb_lock); + req = &cgeb_requests[msg->seq]; + + if (!req->busy || req->ack != msg->ack) { + pr_err("CGEB: Bad response to request %d! Ignoring\n", + msg->seq); + mutex_unlock(&cgeb_lock); + return; + } + + if (msg->len != sizeof(*req->out)) { + pr_err("CGEB: Bad response size for request %d!\n", msg->seq); + mutex_unlock(&cgeb_lock); + return; + } + + pr_debug("Got a response to request %d!\n", msg->seq); + + memcpy(req->out, &msg->data, sizeof(*req->out)); + + req->busy = CGEB_REQ_DONE; + mutex_unlock(&cgeb_lock); + + if (req->callback) + req->callback(req->out, req->user); + + complete(&req->done); +} + +static int cgeb_copy_to_user(struct cgeb_msg *resp, void *user) +{ + struct cgeb_high_desc *high_desc; + unsigned long uncopied; + + high_desc = user; + uncopied = copy_to_user(resp->code.data, high_desc, + high_desc->code_size); + if (uncopied) { + pr_err("CGEB: Couldn't copy code into userspace! %ld\n", + uncopied); + return -ENOMEM; + } + return 0; +} + +static int cgeb_upload_code(struct cgeb_high_desc *high_desc, + struct cgeb_board_data *board) +{ + struct cgeb_msg req = {0}, resp; + size_t len = high_desc->code_size; + int ret = 0; + + req.type = CGEB_MSG_ALLOC_CODE; + req.code.length = len; + pr_debug("CGEB: Allocating memory for code\n"); + ret = cgeb_request(req, &resp, cgeb_copy_to_user, high_desc); + if (ret) + goto out; + if (resp.type != CGEB_MSG_CODE) { + pr_err("CGEB: Bad response type for alloc: %d\n", resp.type); + ret = -EINVAL; + goto out; + } + + board->code = resp.code.data; + board->code_size = len; + + req.type = CGEB_MSG_CODE; + req.code.data = resp.code.data; + req.code.entry_rel = high_desc->entry_rel; + req.code.length = len; + + pr_debug("CGEB: Uploading code\n"); + ret = cgeb_request(req, &resp, NULL, NULL); + + if (ret) + goto out; + + /* Do stuff with response */ + if (resp.type != CGEB_MSG_ACK) { + pr_err("CGEB: Failed to upload code! Got non-ack response!\n"); + ret = -EINVAL; + } + +out: + return ret; +} + +static unsigned short get_data_segment(void) +{ + unsigned short ret; + +#ifdef CONFIG_X86_64 + ret = 0; +#else + asm volatile("mov %%ds, %0\n" + : "=r"(ret) + : + : "memory" + ); +#endif + + return ret; +} + +static int cgeb_after_call(struct cgeb_msg *resp, void *user) +{ + int ret = 0; + int alloc_size; + struct cgeb_call_user *data = user; + + if (!resp->fps.fps.optr) + return ret; + + switch (resp->fps.fps.status) { + case CGEB_NEXT: + case CGEB_NOIRQS: + case CGEB_DELAY: + case CGEB_DBG_HEX: + case CGEB_DBG_DEC: + /* These lead to continuations, we don't need their memory */ + return ret; + + /* Everything else we could need */ + case CGEB_DBG_STR: + data->size = alloc_size = strnlen_user(resp->fps.fps.optr, 1023); + if (alloc_size > 1023) { + data->size = 1023; + alloc_size = data->size + 1; + } + /* Special case, because these come from program memory */ + data->optr = kzalloc(alloc_size, GFP_KERNEL); + if (!data->optr) + return -ENOMEM; + } + + ret = copy_from_user(data->optr, resp->fps.fps.optr, data->size); + + if (ret) { + pr_err("CGEB: Couldn't copy optr out of userspace! %d\n", ret); + ret = -ENOMEM; + } + + if (resp->fps.fps.status == CGEB_SUCCESS && data->callback) { + data->callback(resp->fps.fps.optr, data->optr, + data->callback_data); + } + + return ret; +} + +static int cgeb_after_alloc(struct cgeb_msg *resp, void *user) +{ + int ret; + struct cgeb_after_alloc_data *data = user; + + ret = copy_to_user(resp->code.data, data->kernel, data->length); + + if (ret) { + pr_err("CGEB: Couldn't copy iptr into userspace! %d\n", ret); + + ret = -ENOMEM; + } + + *data->user = resp->code.data; + + return ret; +} + +static int cgeb_get_user_ptr(void *kernel, void __user **user, size_t length) +{ + struct cgeb_msg req = {0}, resp; + struct cgeb_after_alloc_data data; + + data.kernel = kernel; + data.user = user; + data.length = length; + + req.type = CGEB_MSG_ALLOC; + req.code.length = length; + return cgeb_request(req, &resp, cgeb_after_alloc, &data); +} + +static void __user *cgeb_user_alloc(size_t length) +{ + int ret; + struct cgeb_msg req = {0}, resp; + + req.type = CGEB_MSG_ALLOC; + req.code.length = length; + ret = cgeb_request(req, &resp, NULL, NULL); + if (ret) + return NULL; + + return resp.code.data; +} + +static int cgeb_user_free(void __user *memory) +{ + struct cgeb_msg req = {0}, resp; + + req.type = CGEB_MSG_FREE; + req.code.data = memory; + return cgeb_request(req, &resp, NULL, NULL); +} + +/* + * cgeb_call - invoke CGEB BIOS call. + * + * @board: board context data + * @p: CGEB parameters for this call + * @fct: CGEB function code + * @return: 0 on success or negative error code on failure. + * + * Call the CGEB BIOS code with the given parameters. + */ +int cgeb_call(struct cgeb_board_data *board, + struct cgeb_function_parameters *p, enum cgeb_function_t fct) +{ + struct cgeb_fps *fps; + struct cgeb_msg req = {0}, resp; + struct cgeb_call_user user_data, user_data_clone; + int i; + int err; + void __user *iptr_user = NULL; + void __user *optr_user = NULL; + + if ((p->optr && !p->optr_size) || (p->iptr && !p->iptr_size) || + (!p->optr && p->optr_size) || (!p->iptr && p->iptr_size)) { + pr_warn("CGEB: called with impossible iptr/optr\n"); + return -EINVAL; + } + + memset(&req, 0, sizeof(req)); + fps = &req.fps.fps; + + fps->size = sizeof(fps); + fps->fct = fct; + fps->data.off = board->data; + fps->data.seg = board->ds; + fps->data.pad = 0; + fps->status = 0; + fps->cont = fps->subfct = fps->subfps = NULL; + fps->unit = p->unit; + for (i = 0; i < 4; i++) + fps->pars[i] = p->pars[i]; + if (p->iptr) { + if (!p->iptr_size) + return -EINVAL; + err = cgeb_get_user_ptr(p->iptr, &iptr_user, p->iptr_size); + fps->iptr = iptr_user; + if (err) + return err; + } + req.fps.optr_size = p->optr_size; + user_data.optr = p->optr; + user_data.size = p->optr_size; + + user_data.callback = p->callback; + user_data.callback_data = p->callback_data; + + while (1) { + pr_debug("CGEB: CGEB: -> size %02x, fct %02x, data %04x:%p\n", + fps->size, fps->fct, fps->data.seg, fps->data.off); + + user_data_clone = user_data; + req.type = CGEB_MSG_CALL; + req.fps.fps = *fps; + err = cgeb_request(req, &resp, cgeb_after_call, + &user_data_clone); + if (err) + goto out; + if (resp.type != CGEB_MSG_FPS) { + err = -EINVAL; + goto out; + } + fps = &resp.fps.fps; + /* Don't allocate another optr */ + req.fps.optr_size = 0; + + if (resp.fps.optr) + optr_user = resp.fps.optr; + + /* DBG_STR causes an allocation, don't overwrite our original */ + if (fps->status != CGEB_DBG_STR) + user_data = user_data_clone; + + pr_debug("CGEB: CGEB: <- size %02x, fct %02x, data %04x:%p\n", + fps->size, fps->fct, fps->data.seg, fps->data.off); + + switch (fps->status) { + case CGEB_SUCCESS: + goto out; + case CGEB_NEXT: + break; /* simply call again */ + case CGEB_NOIRQS: + __set_current_state(TASK_INTERRUPTIBLE); + schedule_timeout(0); + break; + case CGEB_DELAY: + usleep_range(fps->rets[0], fps->rets[0] + 1000); + break; + case CGEB_DBG_STR: + if (fps->optr) { + pr_debug("CGEB (dbg): %s\n", (char *)user_data_clone.optr); + kfree(user_data_clone.optr); + } + break; + case CGEB_DBG_HEX: + pr_debug("CGEB (dbg): 0x%08x\n", fps->rets[0]); + break; + case CGEB_DBG_DEC: + pr_debug("CGEB (dbg): %d\n", fps->rets[0]); + break; + + default: + /* unknown continuation code */ + err = -EINVAL; + goto out; + } + } +out: + if (iptr_user) + cgeb_user_free(iptr_user); + if (optr_user) + cgeb_user_free(optr_user); + for (i = 0; i < 2; i++) + p->rets[i] = fps->rets[i]; + p->optr = user_data.optr; + + return err; +} +EXPORT_SYMBOL_GPL(cgeb_call); + +/* + * cgeb_call_simple - convenience wrapper for cgeb_call + * + * @board: board context data + * @p: CGEB parameters for this call + * @fct: CGEB function code + * @return: 0 on success or negative error code on failure. + * + * Call the CGEB BIOS code with the given parameters. + */ +int cgeb_call_simple(struct cgeb_board_data *board, + enum cgeb_function_t fct, u32 unit, + void *optr, size_t optr_size, u32 *result) +{ + struct cgeb_function_parameters p; + unsigned int ret; + + memset(&p, 0, sizeof(p)); + p.optr_size = optr_size; + p.unit = unit; + p.optr = optr; + + ret = cgeb_call(board, &p, fct); + + if (result) + *result = p.rets[0]; + + return ret; +} +EXPORT_SYMBOL_GPL(cgeb_call_simple); + +static void *cgeb_find_magic(void *_mem, size_t len, char *magic) +{ + u32 magic0 = ((u32 *)magic)[0]; + u32 magic1 = ((u32 *)magic)[1]; + int i = 0; + + while (i < len) { + u32 *mem = _mem + i; + + if (mem[0] == magic0 && mem[1] == magic1) + return mem; + i += 16; + } + + return NULL; +} + + +static int cgeb_overwrite_map(struct cgeb_msg *req, void *user) +{ + struct cgeb_board_data *board = (struct cgeb_board_data *) user; + struct cgeb_map_mem_list *pmm = board->map_mem; + int err; + + err = copy_to_user(board->map_mem_user, board->map_mem, + sizeof(pmm->entries[0]) * pmm->count + sizeof(*pmm)); + if (err) { + pr_err("CGEB: Couldn't copy map_mem into userspace!\n"); + return -ENOMEM; + } + return 0; +} + +static void cgeb_unmap_memory(struct cgeb_board_data *board) +{ + struct cgeb_map_mem_list *pmm; + struct cgeb_map_mem *pmme; + struct cgeb_msg req = {0}, res; + unsigned long i; + + if (!board->map_mem) + return; + + req.type = CGEB_MSG_MUNMAP; + + pmm = board->map_mem; + pmme = pmm->entries; + pr_debug("CGEB: Unmapping %d pages\n", pmm->count); + for (i = 0; i < pmm->count; i++, pmme++) { + pmme->virt.seg = 0; + if (pmme->virt.off) { + req.code.data = pmme->virt.off; + req.code.length = pmme->size; + pmme->virt.off = NULL; + cgeb_request(req, &res, cgeb_overwrite_map, board); + } + } + board->map_mem_user = NULL; + kfree(board->map_mem); +} + +static int cgeb_deref_map(void __user *userspace, void *optr, void *user) +{ + struct cgeb_board_data *board = (struct cgeb_board_data *) user; + struct cgeb_map_mem_list *list = optr; + size_t size; + int uncopied; + + size = sizeof(*list) + sizeof(list->entries[0]) * list->count; + + board->map_mem = kzalloc(size, GFP_KERNEL); + if (!board->map_mem) + return -ENOMEM; + + board->map_mem_user = userspace; + uncopied = copy_from_user(board->map_mem, board->map_mem_user, size); + if (uncopied) { + pr_err("Couldn't copy map_mem from map_mem_user!\n"); + kfree(board->map_mem); + board->map_mem = NULL; + return -ENOMEM; + } + return 0; +} + + +static int cgeb_map_memory(struct cgeb_board_data *board) +{ + struct cgeb_map_mem_list *pmm; + struct cgeb_map_mem *pmme; + struct cgeb_msg req = {0}, res; + struct cgeb_function_parameters fps = {0}; + int i; + int ret; + + fps.optr = &board->map_mem; + fps.optr_size = sizeof(*board->map_mem); + fps.callback = cgeb_deref_map; + fps.callback_data = board; + ret = cgeb_call(board, &fps, CgebMapGetMem); + if (ret) + return ret; + + if (!board->map_mem) + return 0; + + pmm = board->map_mem; + pmme = pmm->entries; + + req.type = CGEB_MSG_MAP; + + pr_debug("CGEB: Memory Map with %d entries\n", pmm->count); + + for (i = 0; i < pmm->count; i++, pmme++) { + pr_debug("CGEB: Memory map entry phys=%p, size=%08x\n", + pmme->phys, pmme->size); + if (pmme->phys && pmme->size) { + /* We only want to look at the lower 32 bits */ + req.map.phys = (size_t) pmme->phys & 0xffffffff; + req.map.size = pmme->size; + ret = cgeb_request(req, &res, NULL, NULL); + if (ret) + return ret; + if (res.type != CGEB_MSG_MAPPED) { + pr_err("CGEB: Invalid map response!\n"); + return -EINVAL; + } + pmme->virt.off = res.mapped.virt; + } else { + pmme->virt.off = NULL; + } + + pmme->virt.seg = (pmme->virt.off) ? board->ds : 0; + + pr_debug("CGEB: Map phys %p, size %08x, virt %04x:%p\n", + pmme->phys, pmme->size, pmme->virt.seg, + pmme->virt.off); + } + + cgeb_request(req, &res, cgeb_overwrite_map, board); + return cgeb_call_simple(board, CgebMapChanged, 0, NULL, 0, NULL); +} + +static void cgeb_munmap(void __user *ptr, size_t size) +{ + struct cgeb_msg req = {0}, res; + + req.type = CGEB_MSG_MUNMAP; + req.code.data = ptr; + req.code.length = size; + cgeb_request(req, &res, NULL, NULL); +} + +static struct cgeb_board_data *cgeb_open(resource_size_t base, u32 len) +{ + u32 dw; + struct cgeb_boardinfo pbi; + struct cgeb_low_desc *low_desc; + struct cgeb_high_desc *high_desc = NULL; + u32 high_desc_phys; + u32 high_desc_len; + void *pcur, *high_desc_virt; + int ret; + + struct cgeb_board_data *board; + + board = kzalloc(sizeof(*board), GFP_KERNEL); + if (!board) + return NULL; + + pcur = (void *) ioremap_cache(base, len); + if (!pcur) + goto err_kfree; + + /* look for the CGEB descriptor */ + low_desc = cgeb_find_magic(pcur, len, CGEB_LD_MAGIC); + if (!low_desc) + goto err_kfree; + + pr_debug("CGEB: Found CGEB_LD_MAGIC\n"); + + if (low_desc->size < sizeof(struct cgeb_low_desc) - sizeof(long)) + goto err_kfree; + + if (low_desc->size >= sizeof(struct cgeb_low_desc) + && low_desc->hi_desc_phys_addr) + high_desc_phys = low_desc->hi_desc_phys_addr; + else + high_desc_phys = 0xfff00000; + + high_desc_len = (unsigned int) -(int)high_desc_phys; + + pr_debug("CGEB: Looking for CGEB hi desc between phys 0x%x and 0x%x\n", + high_desc_phys, -1); + + high_desc_virt = (void *) ioremap_cache(high_desc_phys, high_desc_len); + if (!high_desc_virt) + goto err_kfree; + + pr_debug("CGEB: Looking for CGEB hi desc between virt 0x%p and 0x%p\n", + high_desc_virt, high_desc_virt + high_desc_len - 1); + + high_desc = cgeb_find_magic(high_desc_virt, high_desc_len, + CGEB_HD_MAGIC); + if (!high_desc) + goto err_iounmap; + + pr_debug("CGEB: Found CGEB_HD_MAGIC\n"); + + if (high_desc->size < sizeof(struct cgeb_high_desc)) + goto err_iounmap; + + pr_debug("CGEB: data_size %u, code_size %u, entry_rel %u\n", + high_desc->data_size, high_desc->code_size, high_desc->entry_rel); + + ret = cgeb_upload_code(high_desc, board); + if (ret) { + pr_err("CGEB: Couldn't upload code to helper: %d\n", ret); + goto err_munmap; + } + + board->ds = get_data_segment(); + + ret = cgeb_call_simple(board, CgebGetCgebVersion, 0, NULL, 0, &dw); + if (ret) + goto err_munmap; + + if (CGEB_GET_VERSION_MAJOR(dw) != CGEB_VERSION_MAJOR) + goto err_munmap; + + pr_debug("CGEB: BIOS interface revision: %d.%d\n", + dw >> 16, dw & 0xffff); + + if (high_desc->data_size) + dw = high_desc->data_size; + else + ret = cgeb_call_simple(board, CgebGetDataSize, 0, NULL, 0, &dw); + + if (!ret && dw) { + board->data = cgeb_user_alloc(high_desc->data_size); + if (!board->data) + goto err_munmap; + } + + ret = cgeb_call_simple(board, CgebOpen, 0, NULL, 0, NULL); + if (ret) + goto err_free_data; + + pr_debug("CGEB: Mapping memory\n"); + ret = cgeb_map_memory(board); + if (ret) + goto err_free_map; + pr_debug("CGEB: Memory is mapped, getting board info\n"); + + ret = cgeb_call_simple(board, CgebBoardGetInfo, 0, &pbi, + sizeof(pbi), NULL); + if (ret) + goto err_free_map; + + pr_info("CGEB: Board name: %c%c%c%c\n", + pbi.board[0], pbi.board[1], + pbi.board[2], pbi.board[3]); + + iounmap((void __iomem *) high_desc_virt); + + return board; + +err_free_map: + cgeb_unmap_memory(board); +err_free_data: + cgeb_user_free(board->data); +err_munmap: + cgeb_munmap(board->code, board->code_size); +err_iounmap: + iounmap((void __iomem *) high_desc_virt); +err_kfree: + kfree(board); + return NULL; +} + +static void cgeb_close(struct cgeb_board_data *board) +{ + cgeb_call_simple(board, CgebClose, 0, NULL, 0, NULL); + + cgeb_unmap_memory(board); + + cgeb_user_free(board->data); + + cgeb_munmap(board->code, board->code_size); +} + +static unsigned long cgeb_i2c_get_type(struct cgeb_board_data *brd, int unit) +{ + struct cgeb_i2c_info info; + int ret; + + ret = cgeb_call_simple(brd, CgebI2CGetInfo, unit, &info, + sizeof(info), NULL); + if (ret) + return ret; + return info.type; +} + +static struct cgeb_board_data *cgeb_board; + +static int __init cgeb_init(void) +{ + struct cgeb_board_data *board; + resource_size_t base; + int i, ret, req; + struct cgeb_pdata pdata; + u32 i2c_count, watchdog_count; + int num_devices = 0; + + for (req = 0; req < CGEB_REQUEST_MAX; ++req) + init_completion(&cgeb_requests[req].done); + + ret = cn_add_callback(&cgeb_cn_id, "cgeb", cgeb_cn_callback); + if (ret) + return ret; + + pr_debug("CGEB: Opening board\n"); + for (base = 0xf0000; base >= 0xc0000; base -= 0x10000) { + board = cgeb_open(base, 0x10000); + if (board) + break; + } + + if (!board) { + ret = -ENODEV; + goto err_no_board; + } + + cgeb_board = board; + + pdata.board = board; + + cgeb_call_simple(board, CgebI2CCount, 0, NULL, 0, &i2c_count); + cgeb_call_simple(board, CgebWDogCount, 0, NULL, 0, &watchdog_count); + + board->num_devices = i2c_count + watchdog_count; + board->devices = kzalloc(sizeof(void *) * (board->num_devices), + GFP_KERNEL); + if (!board->devices) { + ret = -ENOMEM; + goto err_out; + } + + for (i = 0; i < i2c_count; i++) { + ret = cgeb_i2c_get_type(board, i); + if (ret != CGEB_I2C_TYPE_PRIMARY) + continue; + + pdata.unit = i; + + board->devices[num_devices] = + platform_device_register_data(NULL, "cgeb-i2c", i, + &pdata, sizeof(pdata)); + num_devices++; + } + + for (i = 0; i < watchdog_count; i++) { + board->devices[num_devices] = + platform_device_register_data(NULL, "cgeb-watchdog", i, + &pdata, sizeof(pdata)); + pdata.unit = i; + + num_devices++; + } + + return 0; +err_out: + cgeb_close(board); + kfree(board); + +err_no_board: + cn_del_callback(&cgeb_cn_id); + + return ret; +} + +static void __exit cgeb_exit(void) +{ + struct cgeb_board_data *board = cgeb_board; + int i; + + for (i = 0; i < board->num_devices; i++) + if (board->devices[i]) + platform_device_unregister(board->devices[i]); + + cgeb_close(board); + + kfree(board->devices); + kfree(board); + cn_del_callback(&cgeb_cn_id); +} + +module_init(cgeb_init); +module_exit(cgeb_exit); + +MODULE_AUTHOR("Mary Strodl "); +MODULE_DESCRIPTION("CGEB driver"); +MODULE_LICENSE("GPL"); diff --git a/include/linux/mfd/congatec-cgeb.h b/include/linux/mfd/congatec-cgeb.h new file mode 100644 index 000000000000..dba9444c7547 --- /dev/null +++ b/include/linux/mfd/congatec-cgeb.h @@ -0,0 +1,112 @@ +/* SPDX-License-Identifier: GPL-2.0-only */ +#ifndef __CONGATEC_CGEB_H +#define __CONGATEC_CGEB_H + +/* CGEB interface functions */ +enum cgeb_function_t { + CgebGetCgebVersion = 0, + CgebGetSysBiosVersion = 1, + CgebGetVgaBiosVersion = 2, + CgebGetDataSize = 3, + CgebOpen = 4, + CgebClose = 5, + CgebMapGetMem = 6, + CgebMapChanged = 7, + CgebMapGetPorts = 8, + CgebDelayUs = 9, + CgebCgbcReadWrite = 10, + CgebCgbcSetControl = 11, + CgebCgbcGetInfo = 12, + CgebCgbcHandleCommand = 13, + CgebBoardGetInfo = 14, + CgebBoardGetBootCounter = 15, + CgebBoardGetRunningTimeMeter = 16, + CgebBoardGetBootErrorLog = 17, + CgebVgaCount = 18, + CgebVgaGetInfo = 19, + CgebVgaGetContrast = 20, + CgebVgaSetContrast = 21, + CgebVgaGetContrastEnable = 22, + CgebVgaSetContrastEnable = 23, + CgebVgaGetBacklight = 24, + CgebVgaSetBacklight = 25, + CgebVgaGetBacklightEnable = 26, + CgebVgaSetBacklightEnable = 27, + CgebVgaEndDarkBoot = 28, + CgebStorageAreaCount = 29, + CgebStorageAreaGetInfo = 30, + CgebStorageAreaRead = 31, + CgebStorageAreaWrite = 32, + CgebStorageAreaErase = 33, + CgebStorageAreaEraseStatus = 34, + CgebI2CCount = 35, + CgebI2CGetInfo = 36, + CgebI2CGetAddrList = 37, + CgebI2CTransfer = 38, + CgebI2CGetFrequency = 39, + CgebI2CSetFrequency = 40, + CgebIOCount = 41, + CgebIOGetInfo = 42, + CgebIORead = 43, + CgebIOWrite = 44, + CgebIOGetDirection = 45, + CgebIOSetDirection = 46, + CgebWDogCount = 47, + CgebWDogGetInfo = 48, + CgebWDogTrigger = 49, + CgebWDogGetConfig = 50, + CgebWDogSetConfig = 51, + CgebPerformanceGetCurrent = 52, + CgebPerformanceSetCurrent = 53, + CgebPerformanceGetPolicyCaps = 54, + CgebPerformanceGetPolicy = 55, + CgebPerformanceSetPolicy = 56, + CgebTemperatureCount = 57, + CgebTemperatureGetInfo = 58, + CgebTemperatureGetCurrent = 59, + CgebTemperatureSetLimits = 60, + CgebFanCount = 61, + CgebFanGetInfo = 62, + CgebFanGetCurrent = 63, + CgebFanSetLimits = 64, + CgebVoltageCount = 65, + CgebVoltageGetInfo = 66, + CgebVoltageGetCurrent = 67, + CgebVoltageSetLimits = 68, + CgebStorageAreaLock = 69, + CgebStorageAreaUnlock = 70, + CgebStorageAreaIsLocked = 71, +}; + +struct cgeb_function_parameters { + u32 unit; /* unit number or type */ + u32 pars[4]; /* input parameters */ + u32 rets[2]; /* return parameters */ + void *iptr; /* input pointer */ + void *optr; /* output pointer */ + size_t iptr_size; /* size of input pointer */ + size_t optr_size; /* size of output pointer */ + void *callback_data; /* callback data pointer */ + int (*callback)(void __user *optr, void *koptr, void *data); + /* Run when CGEB call finishes with userspace */ + /* optr, kernel optr, and callback_data */ +}; + +struct cgeb_board_data; + +int cgeb_call(struct cgeb_board_data *board, + struct cgeb_function_parameters *p, enum cgeb_function_t fct); + +int cgeb_call_simple(struct cgeb_board_data *board, + enum cgeb_function_t fct, u32 unit, + void *optr, size_t optr_size, u32 *result); + +/* + * Platform data for child devices + */ +struct cgeb_pdata { + struct cgeb_board_data *board; + int unit; +}; + +#endif /* __CONGATEC_CGEB_H */ diff --git a/include/uapi/linux/connector.h b/include/uapi/linux/connector.h index 5ae131c3f145..f64862bee5ce 100644 --- a/include/uapi/linux/connector.h +++ b/include/uapi/linux/connector.h @@ -47,9 +47,11 @@ #define CN_KVP_VAL 0x1 /* queries from the kernel */ #define CN_VSS_IDX 0xA /* HyperV VSS */ #define CN_VSS_VAL 0x1 /* queries from the kernel */ +#define CN_IDX_CGEB 0xB /* congatec CGEB */ +#define CN_VAL_CGEB 0x1 -#define CN_NETLINK_USERS 11 /* Highest index + 1 */ +#define CN_NETLINK_USERS 12 /* Highest index + 1 */ /* * Maximum connector's message size. From patchwork Thu Aug 8 18:35:26 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Mary Strodl X-Patchwork-Id: 818483 Received: from greygoose-centos7.csh.rit.edu (greygoose-centos7.csh.rit.edu [129.21.49.170]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id CD08D155301; Thu, 8 Aug 2024 18:36:08 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=129.21.49.170 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1723142170; cv=none; b=EMO5j7H8CR2L/xf1QUlLb8cikMZjxeTmEG0199eu5KURIqeRk8wwZkAdQTCGIsWZSlKRMBroRUTsuIgJQs1AhMs/xl+7HCyRYkzwdzymTqfPZiqMj9KnVGXf3GSicqDDD28tW/FWP1yExXnac3NSuM33c5GYyZ4rx1QiuDf/i3c= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1723142170; c=relaxed/simple; bh=d35Z1ZJLNZsjqRNLG/h2LEXIWzUn4xuN6K7xgHXBkFI=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=fThrGEmtEO2Jm8HAzzJlcNOFlHdOYEPY8+UBcpnWJqhTCKdj0sdr6MX4/dAtJ117MTNfdYRn2F5P3KbsSUeIxOUx+4FW6PaP4PXoPaSp+zdjFS1Eer7JEAWuBbMT61u+02iaajBCOsU9413DcxQc312RBeDzpb7M3V2hN4upE1E= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=csh.rit.edu; spf=pass smtp.mailfrom=csh.rit.edu; dkim=pass (1024-bit key) header.d=csh.rit.edu header.i=@csh.rit.edu header.b=Xn7E7UcE; arc=none smtp.client-ip=129.21.49.170 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=csh.rit.edu Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=csh.rit.edu Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=csh.rit.edu header.i=@csh.rit.edu header.b="Xn7E7UcE" Received: from localhost (localhost [127.0.0.1]) by greygoose-centos7.csh.rit.edu (Postfix) with ESMTP id D7752456D91E; Thu, 8 Aug 2024 14:36:01 -0400 (EDT) Authentication-Results: mail.csh.rit.edu (amavisd-new); dkim=pass (1024-bit key) reason="pass (just generated, assumed good)" header.d=csh.rit.edu DKIM-Signature: v=1; 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=1723142161; x=1724956562; bh=d35Z1 ZJLNZsjqRNLG/h2LEXIWzUn4xuN6K7xgHXBkFI=; b=Xn7E7UcEH+7x0Uliq1Kdd 0vzrQ2mfI/rTnLueyzsjR0yemUhpLOL2jBPbANgHgTIJ2X3g0m6LmK09K7uzRGPr 2l39qIQHtLasigRyVb/Fl0bNhpzCPr0Olq75k2ji9sPL40DwgFaiw2T7pr0xOKnV 5EqieAks+8m4LlOIb4lfeE= 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 CUu_JpEwKeQw; Thu, 8 Aug 2024 14:36:01 -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 ACEA74140103; Thu, 8 Aug 2024 14:36:00 -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 v3 2/2] i2c: Add Congatec CGEB I2C driver Date: Thu, 8 Aug 2024 14:35:26 -0400 Message-ID: <20240808183527.3950120-3-mstrodl@csh.rit.edu> X-Mailer: git-send-email 2.45.2 In-Reply-To: <20240808183527.3950120-1-mstrodl@csh.rit.edu> References: <20240808183527.3950120-1-mstrodl@csh.rit.edu> Precedence: bulk X-Mailing-List: linux-i2c@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 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 | 10 ++ drivers/i2c/busses/Makefile | 1 + drivers/i2c/busses/i2c-congatec-cgeb.c | 190 +++++++++++++++++++++++++ 3 files changed, 201 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..0a5d348c4664 100644 --- a/drivers/i2c/busses/Kconfig +++ b/drivers/i2c/busses/Kconfig @@ -1261,6 +1261,16 @@ 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 + If you say yes to this option, support will be included for the + Congatec CGEB I2C controller. + + This driver can also be built as a module. If so, the module + will be called i2c-congatec-cgeb. + 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..2a2ebd57285d --- /dev/null +++ b/drivers/i2c/busses/i2c-congatec-cgeb.c @@ -0,0 +1,190 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* + * 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; + + strscpy(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");