From patchwork Tue Sep 29 20:25:11 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Thomas Gleixner X-Patchwork-Id: 297419 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-6.9 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID, DKIM_VALID_AU, HEADER_FROM_DIFFERENT_DOMAINS, MAILING_LIST_MULTI, SIGNED_OFF_BY,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED autolearn=no autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 69366C55164 for ; Tue, 29 Sep 2020 20:40:42 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 0F4B7206D9 for ; Tue, 29 Sep 2020 20:40:42 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=linutronix.de header.i=@linutronix.de header.b="1GpO145p"; dkim=permerror (0-bit key) header.d=linutronix.de header.i=@linutronix.de header.b="oH1tt5b9" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1729610AbgI2Uk0 (ORCPT ); Tue, 29 Sep 2020 16:40:26 -0400 Received: from Galois.linutronix.de ([193.142.43.55]:48548 "EHLO galois.linutronix.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1729278AbgI2Ufs (ORCPT ); Tue, 29 Sep 2020 16:35:48 -0400 Message-Id: <20200929203459.636649336@linutronix.de> DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linutronix.de; s=2020; t=1601411741; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: content-transfer-encoding:content-transfer-encoding: references:references; bh=zKT6uiWXQLFA3adDELIs9bZ/Cvrx9eBVQor7FpTDR7A=; b=1GpO145pLyAt31Rhk23WfgKBY7cJ95c9gHM1kXAU2KBx25RGfKuwUzsc74pXddZtXyJ6nJ 3vLqRXziGQJNJMAI/eMNb8nvHJ7G+WGQZuy9D8BnV6q5SMrpth41GfFAzJZr6zFdhCgvJc Xdi6InLEmbmrIVXi6kqhe+O0Fc5alAiIWOSu9vPBdxjPK7vLAJYvbF9oHfriV9FBQz4tF6 mOyGKbiRvyHrDYNkmf8P9MGMzkFFKyRZFxCgjyZHDg64FAcQFjkByKWrH0Q91VKF3FebAl nwO1Ifkb74A1DvNLnjAbDZh/xhT8BEUAoUxzkYkgzktfghECV7YzL2fEFH9LIg== DKIM-Signature: v=1; a=ed25519-sha256; c=relaxed/relaxed; d=linutronix.de; s=2020e; t=1601411741; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: content-transfer-encoding:content-transfer-encoding: references:references; bh=zKT6uiWXQLFA3adDELIs9bZ/Cvrx9eBVQor7FpTDR7A=; b=oH1tt5b9H7ENt5fe6tbPYxtqFb8sPXyXcS/oyrFpukme7SSwIsMU+kdP/nbS0q2BPpyMy5 lrYtT6bZ8RKk5AAw== Date: Tue, 29 Sep 2020 22:25:11 +0200 From: Thomas Gleixner To: LKML Cc: Peter Zijlstra , Paul McKenney , Matthew Wilcox , Christian Benvenuti , Govindarajulu Varadarajan <_govind@gmx.com>, Dave Miller , Jakub Kicinski , netdev@vger.kernel.org, Jonathan Corbet , Mauro Carvalho Chehab , linux-doc@vger.kernel.org, Sebastian Andrzej Siewior , Luc Van Oostenryck , Jay Cliburn , Chris Snook , Vishal Kulkarni , Jeff Kirsher , intel-wired-lan@lists.osuosl.org, Shannon Nelson , Pensando Drivers , Andrew Lunn , Heiner Kallweit , Russell King , Thomas Bogendoerfer , Solarflare linux maintainers , Edward Cree , Martin Habets , Jon Mason , Daniel Drake , Ulrich Kunitz , Kalle Valo , linux-wireless@vger.kernel.org, linux-usb@vger.kernel.org, Greg Kroah-Hartman , Arend van Spriel , Franky Lin , Hante Meuleman , Chi-Hsien Lin , Wright Feng , brcm80211-dev-list.pdl@broadcom.com, brcm80211-dev-list@cypress.com, Stanislav Yakovlev , Stanislaw Gruszka , Johannes Berg , Emmanuel Grumbach , Luca Coelho , Intel Linux Wireless , Jouni Malinen , Amitkumar Karwar , Ganapathi Bhat , Xinming Hu , libertas-dev@lists.infradead.org, Pascal Terjan , Ping-Ke Shih Subject: [patch V2 02/36] net: caif: Remove unused caif SPI driver References: <20200929202509.673358734@linutronix.de> MIME-Version: 1.0 Content-transfer-encoding: 8-bit Precedence: bulk List-ID: X-Mailing-List: linux-usb@vger.kernel.org From: Thomas Gleixner While chasing in_interrupt() (ab)use in drivers it turned out that the caif_spi driver has never been in use since the driver was merged 10 years ago. There never was any matching code which provides a platform device. The driver has not seen any update (asided of treewide changes and cleanups) since 8 years and the maintainers vanished from the planet. So analysing the potential contexts and the (in)correctness of in_interrupt() usage is just a pointless exercise. Remove the cruft. Signed-off-by: Thomas Gleixner --- Documentation/networking/caif/index.rst | 1 Documentation/networking/caif/spi_porting.rst | 229 ------ drivers/net/caif/Kconfig | 19 drivers/net/caif/Makefile | 4 drivers/net/caif/caif_spi.c | 874 -------------------------- drivers/net/caif/caif_spi_slave.c | 254 ------- include/net/caif/caif_spi.h | 155 ---- 7 files changed, 1536 deletions(-) --- a/Documentation/networking/caif/index.rst +++ b/Documentation/networking/caif/index.rst @@ -10,4 +10,3 @@ CAIF linux_caif caif - spi_porting --- a/Documentation/networking/caif/spi_porting.rst +++ /dev/null @@ -1,229 +0,0 @@ -.. SPDX-License-Identifier: GPL-2.0 - -================ -CAIF SPI porting -================ - -CAIF SPI basics -=============== - -Running CAIF over SPI needs some extra setup, owing to the nature of SPI. -Two extra GPIOs have been added in order to negotiate the transfers -between the master and the slave. The minimum requirement for running -CAIF over SPI is a SPI slave chip and two GPIOs (more details below). -Please note that running as a slave implies that you need to keep up -with the master clock. An overrun or underrun event is fatal. - -CAIF SPI framework -================== - -To make porting as easy as possible, the CAIF SPI has been divided in -two parts. The first part (called the interface part) deals with all -generic functionality such as length framing, SPI frame negotiation -and SPI frame delivery and transmission. The other part is the CAIF -SPI slave device part, which is the module that you have to write if -you want to run SPI CAIF on a new hardware. This part takes care of -the physical hardware, both with regard to SPI and to GPIOs. - -- Implementing a CAIF SPI device: - - - Functionality provided by the CAIF SPI slave device: - - In order to implement a SPI device you will, as a minimum, - need to implement the following - functions: - - :: - - int (*init_xfer) (struct cfspi_xfer * xfer, struct cfspi_dev *dev): - - This function is called by the CAIF SPI interface to give - you a chance to set up your hardware to be ready to receive - a stream of data from the master. The xfer structure contains - both physical and logical addresses, as well as the total length - of the transfer in both directions.The dev parameter can be used - to map to different CAIF SPI slave devices. - - :: - - void (*sig_xfer) (bool xfer, struct cfspi_dev *dev): - - This function is called by the CAIF SPI interface when the output - (SPI_INT) GPIO needs to change state. The boolean value of the xfer - variable indicates whether the GPIO should be asserted (HIGH) or - deasserted (LOW). The dev parameter can be used to map to different CAIF - SPI slave devices. - - - Functionality provided by the CAIF SPI interface: - - :: - - void (*ss_cb) (bool assert, struct cfspi_ifc *ifc); - - This function is called by the CAIF SPI slave device in order to - signal a change of state of the input GPIO (SS) to the interface. - Only active edges are mandatory to be reported. - This function can be called from IRQ context (recommended in order - not to introduce latency). The ifc parameter should be the pointer - returned from the platform probe function in the SPI device structure. - - :: - - void (*xfer_done_cb) (struct cfspi_ifc *ifc); - - This function is called by the CAIF SPI slave device in order to - report that a transfer is completed. This function should only be - called once both the transmission and the reception are completed. - This function can be called from IRQ context (recommended in order - not to introduce latency). The ifc parameter should be the pointer - returned from the platform probe function in the SPI device structure. - - - Connecting the bits and pieces: - - - Filling in the SPI slave device structure: - - Connect the necessary callback functions. - - Indicate clock speed (used to calculate toggle delays). - - Chose a suitable name (helps debugging if you use several CAIF - SPI slave devices). - - Assign your private data (can be used to map to your - structure). - - - Filling in the SPI slave platform device structure: - - Add name of driver to connect to ("cfspi_sspi"). - - Assign the SPI slave device structure as platform data. - -Padding -======= - -In order to optimize throughput, a number of SPI padding options are provided. -Padding can be enabled independently for uplink and downlink transfers. -Padding can be enabled for the head, the tail and for the total frame size. -The padding needs to be correctly configured on both sides of the link. -The padding can be changed via module parameters in cfspi_sspi.c or via -the sysfs directory of the cfspi_sspi driver (before device registration). - -- CAIF SPI device template:: - - /* - * Copyright (C) ST-Ericsson AB 2010 - * Author: Daniel Martensson / Daniel.Martensson@stericsson.com - * License terms: GNU General Public License (GPL), version 2. - * - */ - - #include - #include - #include - #include - #include - #include - #include - - MODULE_LICENSE("GPL"); - - struct sspi_struct { - struct cfspi_dev sdev; - struct cfspi_xfer *xfer; - }; - - static struct sspi_struct slave; - static struct platform_device slave_device; - - static irqreturn_t sspi_irq(int irq, void *arg) - { - /* You only need to trigger on an edge to the active state of the - * SS signal. Once a edge is detected, the ss_cb() function should be - * called with the parameter assert set to true. It is OK - * (and even advised) to call the ss_cb() function in IRQ context in - * order not to add any delay. */ - - return IRQ_HANDLED; - } - - static void sspi_complete(void *context) - { - /* Normally the DMA or the SPI framework will call you back - * in something similar to this. The only thing you need to - * do is to call the xfer_done_cb() function, providing the pointer - * to the CAIF SPI interface. It is OK to call this function - * from IRQ context. */ - } - - static int sspi_init_xfer(struct cfspi_xfer *xfer, struct cfspi_dev *dev) - { - /* Store transfer info. For a normal implementation you should - * set up your DMA here and make sure that you are ready to - * receive the data from the master SPI. */ - - struct sspi_struct *sspi = (struct sspi_struct *)dev->priv; - - sspi->xfer = xfer; - - return 0; - } - - void sspi_sig_xfer(bool xfer, struct cfspi_dev *dev) - { - /* If xfer is true then you should assert the SPI_INT to indicate to - * the master that you are ready to receive the data from the master - * SPI. If xfer is false then you should de-assert SPI_INT to indicate - * that the transfer is done. - */ - - struct sspi_struct *sspi = (struct sspi_struct *)dev->priv; - } - - static void sspi_release(struct device *dev) - { - /* - * Here you should release your SPI device resources. - */ - } - - static int __init sspi_init(void) - { - /* Here you should initialize your SPI device by providing the - * necessary functions, clock speed, name and private data. Once - * done, you can register your device with the - * platform_device_register() function. This function will return - * with the CAIF SPI interface initialized. This is probably also - * the place where you should set up your GPIOs, interrupts and SPI - * resources. */ - - int res = 0; - - /* Initialize slave device. */ - slave.sdev.init_xfer = sspi_init_xfer; - slave.sdev.sig_xfer = sspi_sig_xfer; - slave.sdev.clk_mhz = 13; - slave.sdev.priv = &slave; - slave.sdev.name = "spi_sspi"; - slave_device.dev.release = sspi_release; - - /* Initialize platform device. */ - slave_device.name = "cfspi_sspi"; - slave_device.dev.platform_data = &slave.sdev; - - /* Register platform device. */ - res = platform_device_register(&slave_device); - if (res) { - printk(KERN_WARNING "sspi_init: failed to register dev.\n"); - return -ENODEV; - } - - return res; - } - - static void __exit sspi_exit(void) - { - platform_device_del(&slave_device); - } - - module_init(sspi_init); - module_exit(sspi_exit); --- a/drivers/net/caif/Kconfig +++ b/drivers/net/caif/Kconfig @@ -20,25 +20,6 @@ config CAIF_TTY identified as N_CAIF. When this ldisc is opened from user space it will redirect the TTY's traffic into the CAIF stack. -config CAIF_SPI_SLAVE - tristate "CAIF SPI transport driver for slave interface" - depends on CAIF && HAS_DMA - default n - help - The CAIF Link layer SPI Protocol driver for Slave SPI interface. - This driver implements a platform driver to accommodate for a - platform specific SPI device. A sample CAIF SPI Platform device is - provided in . - -config CAIF_SPI_SYNC - bool "Next command and length in start of frame" - depends on CAIF_SPI_SLAVE - default n - help - Putting the next command and length in the start of the frame can - help to synchronize to the next transfer in case of over or under-runs. - This option also needs to be enabled on the modem. - config CAIF_HSI tristate "CAIF HSI transport driver" depends on CAIF --- a/drivers/net/caif/Makefile +++ b/drivers/net/caif/Makefile @@ -4,10 +4,6 @@ ccflags-$(CONFIG_CAIF_DEBUG) := -DDEBUG # Serial interface obj-$(CONFIG_CAIF_TTY) += caif_serial.o -# SPI slave physical interfaces module -cfspi_slave-objs := caif_spi.o caif_spi_slave.o -obj-$(CONFIG_CAIF_SPI_SLAVE) += cfspi_slave.o - # HSI interface obj-$(CONFIG_CAIF_HSI) += caif_hsi.o --- a/drivers/net/caif/caif_spi.c +++ /dev/null @@ -1,874 +0,0 @@ -// SPDX-License-Identifier: GPL-2.0-only -/* - * Copyright (C) ST-Ericsson AB 2010 - * Author: Daniel Martensson - */ - -#include -#include -#include -#include -#include -#include -#include -#include -#include -#include -#include -#include -#include -#include -#include -#include - -#ifndef CONFIG_CAIF_SPI_SYNC -#define FLAVOR "Flavour: Vanilla.\n" -#else -#define FLAVOR "Flavour: Master CMD&LEN at start.\n" -#endif /* CONFIG_CAIF_SPI_SYNC */ - -MODULE_LICENSE("GPL"); -MODULE_AUTHOR("Daniel Martensson"); -MODULE_DESCRIPTION("CAIF SPI driver"); - -/* Returns the number of padding bytes for alignment. */ -#define PAD_POW2(x, pow) ((((x)&((pow)-1))==0) ? 0 : (((pow)-((x)&((pow)-1))))) - -static bool spi_loop; -module_param(spi_loop, bool, 0444); -MODULE_PARM_DESC(spi_loop, "SPI running in loopback mode."); - -/* SPI frame alignment. */ -module_param(spi_frm_align, int, 0444); -MODULE_PARM_DESC(spi_frm_align, "SPI frame alignment."); - -/* - * SPI padding options. - * Warning: must be a base of 2 (& operation used) and can not be zero ! - */ -module_param(spi_up_head_align, int, 0444); -MODULE_PARM_DESC(spi_up_head_align, "SPI uplink head alignment."); - -module_param(spi_up_tail_align, int, 0444); -MODULE_PARM_DESC(spi_up_tail_align, "SPI uplink tail alignment."); - -module_param(spi_down_head_align, int, 0444); -MODULE_PARM_DESC(spi_down_head_align, "SPI downlink head alignment."); - -module_param(spi_down_tail_align, int, 0444); -MODULE_PARM_DESC(spi_down_tail_align, "SPI downlink tail alignment."); - -#ifdef CONFIG_ARM -#define BYTE_HEX_FMT "%02X" -#else -#define BYTE_HEX_FMT "%02hhX" -#endif - -#define SPI_MAX_PAYLOAD_SIZE 4096 -/* - * Threshold values for the SPI packet queue. Flowcontrol will be asserted - * when the number of packets exceeds HIGH_WATER_MARK. It will not be - * deasserted before the number of packets drops below LOW_WATER_MARK. - */ -#define LOW_WATER_MARK 100 -#define HIGH_WATER_MARK (LOW_WATER_MARK*5) - -#ifndef CONFIG_HAS_DMA - -/* - * We sometimes use UML for debugging, but it cannot handle - * dma_alloc_coherent so we have to wrap it. - */ -static inline void *dma_alloc(struct cfspi *cfspi, dma_addr_t *daddr) -{ - return kmalloc(SPI_DMA_BUF_LEN, GFP_KERNEL); -} - -static inline void dma_free(struct cfspi *cfspi, void *cpu_addr, - dma_addr_t handle) -{ - kfree(cpu_addr); -} - -#else - -static inline void *dma_alloc(struct cfspi *cfspi, dma_addr_t *daddr) -{ - return dma_alloc_coherent(&cfspi->pdev->dev, SPI_DMA_BUF_LEN, daddr, - GFP_KERNEL); -} - -static inline void dma_free(struct cfspi *cfspi, void *cpu_addr, - dma_addr_t handle) -{ - dma_free_coherent(&cfspi->pdev->dev, SPI_DMA_BUF_LEN, cpu_addr, handle); -} -#endif /* CONFIG_HAS_DMA */ - -#ifdef CONFIG_DEBUG_FS - -#define DEBUGFS_BUF_SIZE 4096 - -static struct dentry *dbgfs_root; - -static inline void driver_debugfs_create(void) -{ - dbgfs_root = debugfs_create_dir(cfspi_spi_driver.driver.name, NULL); -} - -static inline void driver_debugfs_remove(void) -{ - debugfs_remove(dbgfs_root); -} - -static inline void dev_debugfs_rem(struct cfspi *cfspi) -{ - debugfs_remove(cfspi->dbgfs_frame); - debugfs_remove(cfspi->dbgfs_state); - debugfs_remove(cfspi->dbgfs_dir); -} - -static ssize_t dbgfs_state(struct file *file, char __user *user_buf, - size_t count, loff_t *ppos) -{ - char *buf; - int len = 0; - ssize_t size; - struct cfspi *cfspi = file->private_data; - - buf = kzalloc(DEBUGFS_BUF_SIZE, GFP_KERNEL); - if (!buf) - return 0; - - /* Print out debug information. */ - len += scnprintf((buf + len), (DEBUGFS_BUF_SIZE - len), - "CAIF SPI debug information:\n"); - - len += scnprintf((buf + len), (DEBUGFS_BUF_SIZE - len), FLAVOR); - - len += scnprintf((buf + len), (DEBUGFS_BUF_SIZE - len), - "STATE: %d\n", cfspi->dbg_state); - len += scnprintf((buf + len), (DEBUGFS_BUF_SIZE - len), - "Previous CMD: 0x%x\n", cfspi->pcmd); - len += scnprintf((buf + len), (DEBUGFS_BUF_SIZE - len), - "Current CMD: 0x%x\n", cfspi->cmd); - len += scnprintf((buf + len), (DEBUGFS_BUF_SIZE - len), - "Previous TX len: %d\n", cfspi->tx_ppck_len); - len += scnprintf((buf + len), (DEBUGFS_BUF_SIZE - len), - "Previous RX len: %d\n", cfspi->rx_ppck_len); - len += scnprintf((buf + len), (DEBUGFS_BUF_SIZE - len), - "Current TX len: %d\n", cfspi->tx_cpck_len); - len += scnprintf((buf + len), (DEBUGFS_BUF_SIZE - len), - "Current RX len: %d\n", cfspi->rx_cpck_len); - len += scnprintf((buf + len), (DEBUGFS_BUF_SIZE - len), - "Next TX len: %d\n", cfspi->tx_npck_len); - len += scnprintf((buf + len), (DEBUGFS_BUF_SIZE - len), - "Next RX len: %d\n", cfspi->rx_npck_len); - - if (len > DEBUGFS_BUF_SIZE) - len = DEBUGFS_BUF_SIZE; - - size = simple_read_from_buffer(user_buf, count, ppos, buf, len); - kfree(buf); - - return size; -} - -static ssize_t print_frame(char *buf, size_t size, char *frm, - size_t count, size_t cut) -{ - int len = 0; - int i; - for (i = 0; i < count; i++) { - len += scnprintf((buf + len), (size - len), - "[0x" BYTE_HEX_FMT "]", - frm[i]); - if ((i == cut) && (count > (cut * 2))) { - /* Fast forward. */ - i = count - cut; - len += scnprintf((buf + len), (size - len), - "--- %zu bytes skipped ---\n", - count - (cut * 2)); - } - - if ((!(i % 10)) && i) { - len += scnprintf((buf + len), (DEBUGFS_BUF_SIZE - len), - "\n"); - } - } - len += scnprintf((buf + len), (DEBUGFS_BUF_SIZE - len), "\n"); - return len; -} - -static ssize_t dbgfs_frame(struct file *file, char __user *user_buf, - size_t count, loff_t *ppos) -{ - char *buf; - int len = 0; - ssize_t size; - struct cfspi *cfspi; - - cfspi = file->private_data; - buf = kzalloc(DEBUGFS_BUF_SIZE, GFP_KERNEL); - if (!buf) - return 0; - - /* Print out debug information. */ - len += scnprintf((buf + len), (DEBUGFS_BUF_SIZE - len), - "Current frame:\n"); - - len += scnprintf((buf + len), (DEBUGFS_BUF_SIZE - len), - "Tx data (Len: %d):\n", cfspi->tx_cpck_len); - - len += print_frame((buf + len), (DEBUGFS_BUF_SIZE - len), - cfspi->xfer.va_tx[0], - (cfspi->tx_cpck_len + SPI_CMD_SZ), 100); - - len += scnprintf((buf + len), (DEBUGFS_BUF_SIZE - len), - "Rx data (Len: %d):\n", cfspi->rx_cpck_len); - - len += print_frame((buf + len), (DEBUGFS_BUF_SIZE - len), - cfspi->xfer.va_rx, - (cfspi->rx_cpck_len + SPI_CMD_SZ), 100); - - size = simple_read_from_buffer(user_buf, count, ppos, buf, len); - kfree(buf); - - return size; -} - -static const struct file_operations dbgfs_state_fops = { - .open = simple_open, - .read = dbgfs_state, - .owner = THIS_MODULE -}; - -static const struct file_operations dbgfs_frame_fops = { - .open = simple_open, - .read = dbgfs_frame, - .owner = THIS_MODULE -}; - -static inline void dev_debugfs_add(struct cfspi *cfspi) -{ - cfspi->dbgfs_dir = debugfs_create_dir(cfspi->pdev->name, dbgfs_root); - cfspi->dbgfs_state = debugfs_create_file("state", 0444, - cfspi->dbgfs_dir, cfspi, - &dbgfs_state_fops); - cfspi->dbgfs_frame = debugfs_create_file("frame", 0444, - cfspi->dbgfs_dir, cfspi, - &dbgfs_frame_fops); -} - -inline void cfspi_dbg_state(struct cfspi *cfspi, int state) -{ - cfspi->dbg_state = state; -}; -#else - -static inline void driver_debugfs_create(void) -{ -} - -static inline void driver_debugfs_remove(void) -{ -} - -static inline void dev_debugfs_add(struct cfspi *cfspi) -{ -} - -static inline void dev_debugfs_rem(struct cfspi *cfspi) -{ -} - -inline void cfspi_dbg_state(struct cfspi *cfspi, int state) -{ -} -#endif /* CONFIG_DEBUG_FS */ - -static LIST_HEAD(cfspi_list); -static spinlock_t cfspi_list_lock; - -/* SPI uplink head alignment. */ -static ssize_t up_head_align_show(struct device_driver *driver, char *buf) -{ - return sprintf(buf, "%d\n", spi_up_head_align); -} - -static DRIVER_ATTR_RO(up_head_align); - -/* SPI uplink tail alignment. */ -static ssize_t up_tail_align_show(struct device_driver *driver, char *buf) -{ - return sprintf(buf, "%d\n", spi_up_tail_align); -} - -static DRIVER_ATTR_RO(up_tail_align); - -/* SPI downlink head alignment. */ -static ssize_t down_head_align_show(struct device_driver *driver, char *buf) -{ - return sprintf(buf, "%d\n", spi_down_head_align); -} - -static DRIVER_ATTR_RO(down_head_align); - -/* SPI downlink tail alignment. */ -static ssize_t down_tail_align_show(struct device_driver *driver, char *buf) -{ - return sprintf(buf, "%d\n", spi_down_tail_align); -} - -static DRIVER_ATTR_RO(down_tail_align); - -/* SPI frame alignment. */ -static ssize_t frame_align_show(struct device_driver *driver, char *buf) -{ - return sprintf(buf, "%d\n", spi_frm_align); -} - -static DRIVER_ATTR_RO(frame_align); - -int cfspi_xmitfrm(struct cfspi *cfspi, u8 *buf, size_t len) -{ - u8 *dst = buf; - caif_assert(buf); - - if (cfspi->slave && !cfspi->slave_talked) - cfspi->slave_talked = true; - - do { - struct sk_buff *skb; - struct caif_payload_info *info; - int spad = 0; - int epad; - - skb = skb_dequeue(&cfspi->chead); - if (!skb) - break; - - /* - * Calculate length of frame including SPI padding. - * The payload position is found in the control buffer. - */ - info = (struct caif_payload_info *)&skb->cb; - - /* - * Compute head offset i.e. number of bytes to add to - * get the start of the payload aligned. - */ - if (spi_up_head_align > 1) { - spad = 1 + PAD_POW2((info->hdr_len + 1), spi_up_head_align); - *dst = (u8)(spad - 1); - dst += spad; - } - - /* Copy in CAIF frame. */ - skb_copy_bits(skb, 0, dst, skb->len); - dst += skb->len; - cfspi->ndev->stats.tx_packets++; - cfspi->ndev->stats.tx_bytes += skb->len; - - /* - * Compute tail offset i.e. number of bytes to add to - * get the complete CAIF frame aligned. - */ - epad = PAD_POW2((skb->len + spad), spi_up_tail_align); - dst += epad; - - dev_kfree_skb(skb); - - } while ((dst - buf) < len); - - return dst - buf; -} - -int cfspi_xmitlen(struct cfspi *cfspi) -{ - struct sk_buff *skb = NULL; - int frm_len = 0; - int pkts = 0; - - /* - * Decommit previously committed frames. - * skb_queue_splice_tail(&cfspi->chead,&cfspi->qhead) - */ - while (skb_peek(&cfspi->chead)) { - skb = skb_dequeue_tail(&cfspi->chead); - skb_queue_head(&cfspi->qhead, skb); - } - - do { - struct caif_payload_info *info = NULL; - int spad = 0; - int epad = 0; - - skb = skb_dequeue(&cfspi->qhead); - if (!skb) - break; - - /* - * Calculate length of frame including SPI padding. - * The payload position is found in the control buffer. - */ - info = (struct caif_payload_info *)&skb->cb; - - /* - * Compute head offset i.e. number of bytes to add to - * get the start of the payload aligned. - */ - if (spi_up_head_align > 1) - spad = 1 + PAD_POW2((info->hdr_len + 1), spi_up_head_align); - - /* - * Compute tail offset i.e. number of bytes to add to - * get the complete CAIF frame aligned. - */ - epad = PAD_POW2((skb->len + spad), spi_up_tail_align); - - if ((skb->len + spad + epad + frm_len) <= CAIF_MAX_SPI_FRAME) { - skb_queue_tail(&cfspi->chead, skb); - pkts++; - frm_len += skb->len + spad + epad; - } else { - /* Put back packet. */ - skb_queue_head(&cfspi->qhead, skb); - break; - } - } while (pkts <= CAIF_MAX_SPI_PKTS); - - /* - * Send flow on if previously sent flow off - * and now go below the low water mark - */ - if (cfspi->flow_off_sent && cfspi->qhead.qlen < cfspi->qd_low_mark && - cfspi->cfdev.flowctrl) { - cfspi->flow_off_sent = 0; - cfspi->cfdev.flowctrl(cfspi->ndev, 1); - } - - return frm_len; -} - -static void cfspi_ss_cb(bool assert, struct cfspi_ifc *ifc) -{ - struct cfspi *cfspi = (struct cfspi *)ifc->priv; - - /* - * The slave device is the master on the link. Interrupts before the - * slave has transmitted are considered spurious. - */ - if (cfspi->slave && !cfspi->slave_talked) { - printk(KERN_WARNING "CFSPI: Spurious SS interrupt.\n"); - return; - } - - if (!in_interrupt()) - spin_lock(&cfspi->lock); - if (assert) { - set_bit(SPI_SS_ON, &cfspi->state); - set_bit(SPI_XFER, &cfspi->state); - } else { - set_bit(SPI_SS_OFF, &cfspi->state); - } - if (!in_interrupt()) - spin_unlock(&cfspi->lock); - - /* Wake up the xfer thread. */ - if (assert) - wake_up_interruptible(&cfspi->wait); -} - -static void cfspi_xfer_done_cb(struct cfspi_ifc *ifc) -{ - struct cfspi *cfspi = (struct cfspi *)ifc->priv; - - /* Transfer done, complete work queue */ - complete(&cfspi->comp); -} - -static netdev_tx_t cfspi_xmit(struct sk_buff *skb, struct net_device *dev) -{ - struct cfspi *cfspi = NULL; - unsigned long flags; - if (!dev) - return -EINVAL; - - cfspi = netdev_priv(dev); - - skb_queue_tail(&cfspi->qhead, skb); - - spin_lock_irqsave(&cfspi->lock, flags); - if (!test_and_set_bit(SPI_XFER, &cfspi->state)) { - /* Wake up xfer thread. */ - wake_up_interruptible(&cfspi->wait); - } - spin_unlock_irqrestore(&cfspi->lock, flags); - - /* Send flow off if number of bytes is above high water mark */ - if (!cfspi->flow_off_sent && - cfspi->qhead.qlen > cfspi->qd_high_mark && - cfspi->cfdev.flowctrl) { - cfspi->flow_off_sent = 1; - cfspi->cfdev.flowctrl(cfspi->ndev, 0); - } - - return NETDEV_TX_OK; -} - -int cfspi_rxfrm(struct cfspi *cfspi, u8 *buf, size_t len) -{ - u8 *src = buf; - - caif_assert(buf != NULL); - - do { - int res; - struct sk_buff *skb = NULL; - int spad = 0; - int epad = 0; - int pkt_len = 0; - - /* - * Compute head offset i.e. number of bytes added to - * get the start of the payload aligned. - */ - if (spi_down_head_align > 1) { - spad = 1 + *src; - src += spad; - } - - /* Read length of CAIF frame (little endian). */ - pkt_len = *src; - pkt_len |= ((*(src+1)) << 8) & 0xFF00; - pkt_len += 2; /* Add FCS fields. */ - - /* Get a suitable caif packet and copy in data. */ - - skb = netdev_alloc_skb(cfspi->ndev, pkt_len + 1); - caif_assert(skb != NULL); - - skb_put_data(skb, src, pkt_len); - src += pkt_len; - - skb->protocol = htons(ETH_P_CAIF); - skb_reset_mac_header(skb); - - /* - * Push received packet up the stack. - */ - if (!spi_loop) - res = netif_rx_ni(skb); - else - res = cfspi_xmit(skb, cfspi->ndev); - - if (!res) { - cfspi->ndev->stats.rx_packets++; - cfspi->ndev->stats.rx_bytes += pkt_len; - } else - cfspi->ndev->stats.rx_dropped++; - - /* - * Compute tail offset i.e. number of bytes added to - * get the complete CAIF frame aligned. - */ - epad = PAD_POW2((pkt_len + spad), spi_down_tail_align); - src += epad; - } while ((src - buf) < len); - - return src - buf; -} - -static int cfspi_open(struct net_device *dev) -{ - netif_wake_queue(dev); - return 0; -} - -static int cfspi_close(struct net_device *dev) -{ - netif_stop_queue(dev); - return 0; -} - -static int cfspi_init(struct net_device *dev) -{ - int res = 0; - struct cfspi *cfspi = netdev_priv(dev); - - /* Set flow info. */ - cfspi->flow_off_sent = 0; - cfspi->qd_low_mark = LOW_WATER_MARK; - cfspi->qd_high_mark = HIGH_WATER_MARK; - - /* Set slave info. */ - if (!strncmp(cfspi_spi_driver.driver.name, "cfspi_sspi", 10)) { - cfspi->slave = true; - cfspi->slave_talked = false; - } else { - cfspi->slave = false; - cfspi->slave_talked = false; - } - - /* Allocate DMA buffers. */ - cfspi->xfer.va_tx[0] = dma_alloc(cfspi, &cfspi->xfer.pa_tx[0]); - if (!cfspi->xfer.va_tx[0]) { - res = -ENODEV; - goto err_dma_alloc_tx_0; - } - - cfspi->xfer.va_rx = dma_alloc(cfspi, &cfspi->xfer.pa_rx); - - if (!cfspi->xfer.va_rx) { - res = -ENODEV; - goto err_dma_alloc_rx; - } - - /* Initialize the work queue. */ - INIT_WORK(&cfspi->work, cfspi_xfer); - - /* Initialize spin locks. */ - spin_lock_init(&cfspi->lock); - - /* Initialize flow control state. */ - cfspi->flow_stop = false; - - /* Initialize wait queue. */ - init_waitqueue_head(&cfspi->wait); - - /* Create work thread. */ - cfspi->wq = create_singlethread_workqueue(dev->name); - if (!cfspi->wq) { - printk(KERN_WARNING "CFSPI: failed to create work queue.\n"); - res = -ENODEV; - goto err_create_wq; - } - - /* Initialize work queue. */ - init_completion(&cfspi->comp); - - /* Create debugfs entries. */ - dev_debugfs_add(cfspi); - - /* Set up the ifc. */ - cfspi->ifc.ss_cb = cfspi_ss_cb; - cfspi->ifc.xfer_done_cb = cfspi_xfer_done_cb; - cfspi->ifc.priv = cfspi; - - /* Add CAIF SPI device to list. */ - spin_lock(&cfspi_list_lock); - list_add_tail(&cfspi->list, &cfspi_list); - spin_unlock(&cfspi_list_lock); - - /* Schedule the work queue. */ - queue_work(cfspi->wq, &cfspi->work); - - return 0; - - err_create_wq: - dma_free(cfspi, cfspi->xfer.va_rx, cfspi->xfer.pa_rx); - err_dma_alloc_rx: - dma_free(cfspi, cfspi->xfer.va_tx[0], cfspi->xfer.pa_tx[0]); - err_dma_alloc_tx_0: - return res; -} - -static void cfspi_uninit(struct net_device *dev) -{ - struct cfspi *cfspi = netdev_priv(dev); - - /* Remove from list. */ - spin_lock(&cfspi_list_lock); - list_del(&cfspi->list); - spin_unlock(&cfspi_list_lock); - - cfspi->ndev = NULL; - /* Free DMA buffers. */ - dma_free(cfspi, cfspi->xfer.va_rx, cfspi->xfer.pa_rx); - dma_free(cfspi, cfspi->xfer.va_tx[0], cfspi->xfer.pa_tx[0]); - set_bit(SPI_TERMINATE, &cfspi->state); - wake_up_interruptible(&cfspi->wait); - destroy_workqueue(cfspi->wq); - /* Destroy debugfs directory and files. */ - dev_debugfs_rem(cfspi); - return; -} - -static const struct net_device_ops cfspi_ops = { - .ndo_open = cfspi_open, - .ndo_stop = cfspi_close, - .ndo_init = cfspi_init, - .ndo_uninit = cfspi_uninit, - .ndo_start_xmit = cfspi_xmit -}; - -static void cfspi_setup(struct net_device *dev) -{ - struct cfspi *cfspi = netdev_priv(dev); - dev->features = 0; - dev->netdev_ops = &cfspi_ops; - dev->type = ARPHRD_CAIF; - dev->flags = IFF_NOARP | IFF_POINTOPOINT; - dev->priv_flags |= IFF_NO_QUEUE; - dev->mtu = SPI_MAX_PAYLOAD_SIZE; - dev->needs_free_netdev = true; - skb_queue_head_init(&cfspi->qhead); - skb_queue_head_init(&cfspi->chead); - cfspi->cfdev.link_select = CAIF_LINK_HIGH_BANDW; - cfspi->cfdev.use_frag = false; - cfspi->cfdev.use_stx = false; - cfspi->cfdev.use_fcs = false; - cfspi->ndev = dev; -} - -int cfspi_spi_probe(struct platform_device *pdev) -{ - struct cfspi *cfspi = NULL; - struct net_device *ndev; - struct cfspi_dev *dev; - int res; - dev = (struct cfspi_dev *)pdev->dev.platform_data; - - if (!dev) - return -ENODEV; - - ndev = alloc_netdev(sizeof(struct cfspi), "cfspi%d", - NET_NAME_UNKNOWN, cfspi_setup); - if (!ndev) - return -ENOMEM; - - cfspi = netdev_priv(ndev); - netif_stop_queue(ndev); - cfspi->ndev = ndev; - cfspi->pdev = pdev; - - /* Assign the SPI device. */ - cfspi->dev = dev; - /* Assign the device ifc to this SPI interface. */ - dev->ifc = &cfspi->ifc; - - /* Register network device. */ - res = register_netdev(ndev); - if (res) { - printk(KERN_ERR "CFSPI: Reg. error: %d.\n", res); - goto err_net_reg; - } - return res; - - err_net_reg: - free_netdev(ndev); - - return res; -} - -int cfspi_spi_remove(struct platform_device *pdev) -{ - /* Everything is done in cfspi_uninit(). */ - return 0; -} - -static void __exit cfspi_exit_module(void) -{ - struct list_head *list_node; - struct list_head *n; - struct cfspi *cfspi = NULL; - - list_for_each_safe(list_node, n, &cfspi_list) { - cfspi = list_entry(list_node, struct cfspi, list); - unregister_netdev(cfspi->ndev); - } - - /* Destroy sysfs files. */ - driver_remove_file(&cfspi_spi_driver.driver, - &driver_attr_up_head_align); - driver_remove_file(&cfspi_spi_driver.driver, - &driver_attr_up_tail_align); - driver_remove_file(&cfspi_spi_driver.driver, - &driver_attr_down_head_align); - driver_remove_file(&cfspi_spi_driver.driver, - &driver_attr_down_tail_align); - driver_remove_file(&cfspi_spi_driver.driver, &driver_attr_frame_align); - /* Unregister platform driver. */ - platform_driver_unregister(&cfspi_spi_driver); - /* Destroy debugfs root directory. */ - driver_debugfs_remove(); -} - -static int __init cfspi_init_module(void) -{ - int result; - - /* Initialize spin lock. */ - spin_lock_init(&cfspi_list_lock); - - /* Register platform driver. */ - result = platform_driver_register(&cfspi_spi_driver); - if (result) { - printk(KERN_ERR "Could not register platform SPI driver.\n"); - goto err_dev_register; - } - - /* Create sysfs files. */ - result = - driver_create_file(&cfspi_spi_driver.driver, - &driver_attr_up_head_align); - if (result) { - printk(KERN_ERR "Sysfs creation failed 1.\n"); - goto err_create_up_head_align; - } - - result = - driver_create_file(&cfspi_spi_driver.driver, - &driver_attr_up_tail_align); - if (result) { - printk(KERN_ERR "Sysfs creation failed 2.\n"); - goto err_create_up_tail_align; - } - - result = - driver_create_file(&cfspi_spi_driver.driver, - &driver_attr_down_head_align); - if (result) { - printk(KERN_ERR "Sysfs creation failed 3.\n"); - goto err_create_down_head_align; - } - - result = - driver_create_file(&cfspi_spi_driver.driver, - &driver_attr_down_tail_align); - if (result) { - printk(KERN_ERR "Sysfs creation failed 4.\n"); - goto err_create_down_tail_align; - } - - result = - driver_create_file(&cfspi_spi_driver.driver, - &driver_attr_frame_align); - if (result) { - printk(KERN_ERR "Sysfs creation failed 5.\n"); - goto err_create_frame_align; - } - driver_debugfs_create(); - return result; - - err_create_frame_align: - driver_remove_file(&cfspi_spi_driver.driver, - &driver_attr_down_tail_align); - err_create_down_tail_align: - driver_remove_file(&cfspi_spi_driver.driver, - &driver_attr_down_head_align); - err_create_down_head_align: - driver_remove_file(&cfspi_spi_driver.driver, - &driver_attr_up_tail_align); - err_create_up_tail_align: - driver_remove_file(&cfspi_spi_driver.driver, - &driver_attr_up_head_align); - err_create_up_head_align: - platform_driver_unregister(&cfspi_spi_driver); - err_dev_register: - return result; -} - -module_init(cfspi_init_module); -module_exit(cfspi_exit_module); --- a/drivers/net/caif/caif_spi_slave.c +++ /dev/null @@ -1,254 +0,0 @@ -// SPDX-License-Identifier: GPL-2.0-only -/* - * Copyright (C) ST-Ericsson AB 2010 - * Author: Daniel Martensson - */ -#include -#include -#include -#include -#include -#include -#include -#include -#include -#include -#include -#include -#include -#include - -#ifndef CONFIG_CAIF_SPI_SYNC -#define SPI_DATA_POS 0 -static inline int forward_to_spi_cmd(struct cfspi *cfspi) -{ - return cfspi->rx_cpck_len; -} -#else -#define SPI_DATA_POS SPI_CMD_SZ -static inline int forward_to_spi_cmd(struct cfspi *cfspi) -{ - return 0; -} -#endif - -int spi_frm_align = 2; - -/* - * SPI padding options. - * Warning: must be a base of 2 (& operation used) and can not be zero ! - */ -int spi_up_head_align = 1 << 1; -int spi_up_tail_align = 1 << 0; -int spi_down_head_align = 1 << 2; -int spi_down_tail_align = 1 << 1; - -#ifdef CONFIG_DEBUG_FS -static inline void debugfs_store_prev(struct cfspi *cfspi) -{ - /* Store previous command for debugging reasons.*/ - cfspi->pcmd = cfspi->cmd; - /* Store previous transfer. */ - cfspi->tx_ppck_len = cfspi->tx_cpck_len; - cfspi->rx_ppck_len = cfspi->rx_cpck_len; -} -#else -static inline void debugfs_store_prev(struct cfspi *cfspi) -{ -} -#endif - -void cfspi_xfer(struct work_struct *work) -{ - struct cfspi *cfspi; - u8 *ptr = NULL; - unsigned long flags; - int ret; - cfspi = container_of(work, struct cfspi, work); - - /* Initialize state. */ - cfspi->cmd = SPI_CMD_EOT; - - for (;;) { - - cfspi_dbg_state(cfspi, CFSPI_STATE_WAITING); - - /* Wait for master talk or transmit event. */ - wait_event_interruptible(cfspi->wait, - test_bit(SPI_XFER, &cfspi->state) || - test_bit(SPI_TERMINATE, &cfspi->state)); - - if (test_bit(SPI_TERMINATE, &cfspi->state)) - return; - -#if CFSPI_DBG_PREFILL - /* Prefill buffers for easier debugging. */ - memset(cfspi->xfer.va_tx, 0xFF, SPI_DMA_BUF_LEN); - memset(cfspi->xfer.va_rx, 0xFF, SPI_DMA_BUF_LEN); -#endif /* CFSPI_DBG_PREFILL */ - - cfspi_dbg_state(cfspi, CFSPI_STATE_AWAKE); - - /* Check whether we have a committed frame. */ - if (cfspi->tx_cpck_len) { - int len; - - cfspi_dbg_state(cfspi, CFSPI_STATE_FETCH_PKT); - - /* Copy committed SPI frames after the SPI indication. */ - ptr = (u8 *) cfspi->xfer.va_tx; - ptr += SPI_IND_SZ; - len = cfspi_xmitfrm(cfspi, ptr, cfspi->tx_cpck_len); - WARN_ON(len != cfspi->tx_cpck_len); - } - - cfspi_dbg_state(cfspi, CFSPI_STATE_GET_NEXT); - - /* Get length of next frame to commit. */ - cfspi->tx_npck_len = cfspi_xmitlen(cfspi); - - WARN_ON(cfspi->tx_npck_len > SPI_DMA_BUF_LEN); - - /* - * Add indication and length at the beginning of the frame, - * using little endian. - */ - ptr = (u8 *) cfspi->xfer.va_tx; - *ptr++ = SPI_CMD_IND; - *ptr++ = (SPI_CMD_IND & 0xFF00) >> 8; - *ptr++ = cfspi->tx_npck_len & 0x00FF; - *ptr++ = (cfspi->tx_npck_len & 0xFF00) >> 8; - - /* Calculate length of DMAs. */ - cfspi->xfer.tx_dma_len = cfspi->tx_cpck_len + SPI_IND_SZ; - cfspi->xfer.rx_dma_len = cfspi->rx_cpck_len + SPI_CMD_SZ; - - /* Add SPI TX frame alignment padding, if necessary. */ - if (cfspi->tx_cpck_len && - (cfspi->xfer.tx_dma_len % spi_frm_align)) { - - cfspi->xfer.tx_dma_len += spi_frm_align - - (cfspi->xfer.tx_dma_len % spi_frm_align); - } - - /* Add SPI RX frame alignment padding, if necessary. */ - if (cfspi->rx_cpck_len && - (cfspi->xfer.rx_dma_len % spi_frm_align)) { - - cfspi->xfer.rx_dma_len += spi_frm_align - - (cfspi->xfer.rx_dma_len % spi_frm_align); - } - - cfspi_dbg_state(cfspi, CFSPI_STATE_INIT_XFER); - - /* Start transfer. */ - ret = cfspi->dev->init_xfer(&cfspi->xfer, cfspi->dev); - WARN_ON(ret); - - cfspi_dbg_state(cfspi, CFSPI_STATE_WAIT_ACTIVE); - - /* - * TODO: We might be able to make an assumption if this is the - * first loop. Make sure that minimum toggle time is respected. - */ - udelay(MIN_TRANSITION_TIME_USEC); - - cfspi_dbg_state(cfspi, CFSPI_STATE_SIG_ACTIVE); - - /* Signal that we are ready to receive data. */ - cfspi->dev->sig_xfer(true, cfspi->dev); - - cfspi_dbg_state(cfspi, CFSPI_STATE_WAIT_XFER_DONE); - - /* Wait for transfer completion. */ - wait_for_completion(&cfspi->comp); - - cfspi_dbg_state(cfspi, CFSPI_STATE_XFER_DONE); - - if (cfspi->cmd == SPI_CMD_EOT) { - /* - * Clear the master talk bit. A xfer is always at - * least two bursts. - */ - clear_bit(SPI_SS_ON, &cfspi->state); - } - - cfspi_dbg_state(cfspi, CFSPI_STATE_WAIT_INACTIVE); - - /* Make sure that the minimum toggle time is respected. */ - if (SPI_XFER_TIME_USEC(cfspi->xfer.tx_dma_len, - cfspi->dev->clk_mhz) < - MIN_TRANSITION_TIME_USEC) { - - udelay(MIN_TRANSITION_TIME_USEC - - SPI_XFER_TIME_USEC - (cfspi->xfer.tx_dma_len, cfspi->dev->clk_mhz)); - } - - cfspi_dbg_state(cfspi, CFSPI_STATE_SIG_INACTIVE); - - /* De-assert transfer signal. */ - cfspi->dev->sig_xfer(false, cfspi->dev); - - /* Check whether we received a CAIF packet. */ - if (cfspi->rx_cpck_len) { - int len; - - cfspi_dbg_state(cfspi, CFSPI_STATE_DELIVER_PKT); - - /* Parse SPI frame. */ - ptr = ((u8 *)(cfspi->xfer.va_rx + SPI_DATA_POS)); - - len = cfspi_rxfrm(cfspi, ptr, cfspi->rx_cpck_len); - WARN_ON(len != cfspi->rx_cpck_len); - } - - /* Check the next SPI command and length. */ - ptr = (u8 *) cfspi->xfer.va_rx; - - ptr += forward_to_spi_cmd(cfspi); - - cfspi->cmd = *ptr++; - cfspi->cmd |= ((*ptr++) << 8) & 0xFF00; - cfspi->rx_npck_len = *ptr++; - cfspi->rx_npck_len |= ((*ptr++) << 8) & 0xFF00; - - WARN_ON(cfspi->rx_npck_len > SPI_DMA_BUF_LEN); - WARN_ON(cfspi->cmd > SPI_CMD_EOT); - - debugfs_store_prev(cfspi); - - /* Check whether the master issued an EOT command. */ - if (cfspi->cmd == SPI_CMD_EOT) { - /* Reset state. */ - cfspi->tx_cpck_len = 0; - cfspi->rx_cpck_len = 0; - } else { - /* Update state. */ - cfspi->tx_cpck_len = cfspi->tx_npck_len; - cfspi->rx_cpck_len = cfspi->rx_npck_len; - } - - /* - * Check whether we need to clear the xfer bit. - * Spin lock needed for packet insertion. - * Test and clear of different bits - * are not supported. - */ - spin_lock_irqsave(&cfspi->lock, flags); - if (cfspi->cmd == SPI_CMD_EOT && !cfspi_xmitlen(cfspi) - && !test_bit(SPI_SS_ON, &cfspi->state)) - clear_bit(SPI_XFER, &cfspi->state); - - spin_unlock_irqrestore(&cfspi->lock, flags); - } -} - -struct platform_driver cfspi_spi_driver = { - .probe = cfspi_spi_probe, - .remove = cfspi_spi_remove, - .driver = { - .name = "cfspi_sspi", - .owner = THIS_MODULE, - }, -}; --- a/include/net/caif/caif_spi.h +++ /dev/null @@ -1,155 +0,0 @@ -/* SPDX-License-Identifier: GPL-2.0-only */ -/* - * Copyright (C) ST-Ericsson AB 2010 - * Author: Daniel Martensson / Daniel.Martensson@stericsson.com - */ - -#ifndef CAIF_SPI_H_ -#define CAIF_SPI_H_ - -#include - -#define SPI_CMD_WR 0x00 -#define SPI_CMD_RD 0x01 -#define SPI_CMD_EOT 0x02 -#define SPI_CMD_IND 0x04 - -#define SPI_DMA_BUF_LEN 8192 - -#define WL_SZ 2 /* 16 bits. */ -#define SPI_CMD_SZ 4 /* 32 bits. */ -#define SPI_IND_SZ 4 /* 32 bits. */ - -#define SPI_XFER 0 -#define SPI_SS_ON 1 -#define SPI_SS_OFF 2 -#define SPI_TERMINATE 3 - -/* Minimum time between different levels is 50 microseconds. */ -#define MIN_TRANSITION_TIME_USEC 50 - -/* Defines for calculating duration of SPI transfers for a particular - * number of bytes. - */ -#define SPI_MASTER_CLK_MHZ 13 -#define SPI_XFER_TIME_USEC(bytes, clk) (((bytes) * 8) / clk) - -/* Normally this should be aligned on the modem in order to benefit from full - * duplex transfers. However a size of 8188 provokes errors when running with - * the modem. These errors occur when packet sizes approaches 4 kB of data. - */ -#define CAIF_MAX_SPI_FRAME 4092 - -/* Maximum number of uplink CAIF frames that can reside in the same SPI frame. - * This number should correspond with the modem setting. The application side - * CAIF accepts any number of embedded downlink CAIF frames. - */ -#define CAIF_MAX_SPI_PKTS 9 - -/* Decides if SPI buffers should be prefilled with 0xFF pattern for easier - * debugging. Both TX and RX buffers will be filled before the transfer. - */ -#define CFSPI_DBG_PREFILL 0 - -/* Structure describing a SPI transfer. */ -struct cfspi_xfer { - u16 tx_dma_len; - u16 rx_dma_len; - void *va_tx[2]; - dma_addr_t pa_tx[2]; - void *va_rx; - dma_addr_t pa_rx; -}; - -/* Structure implemented by the SPI interface. */ -struct cfspi_ifc { - void (*ss_cb) (bool assert, struct cfspi_ifc *ifc); - void (*xfer_done_cb) (struct cfspi_ifc *ifc); - void *priv; -}; - -/* Structure implemented by SPI clients. */ -struct cfspi_dev { - int (*init_xfer) (struct cfspi_xfer *xfer, struct cfspi_dev *dev); - void (*sig_xfer) (bool xfer, struct cfspi_dev *dev); - struct cfspi_ifc *ifc; - char *name; - u32 clk_mhz; - void *priv; -}; - -/* Enumeration describing the CAIF SPI state. */ -enum cfspi_state { - CFSPI_STATE_WAITING = 0, - CFSPI_STATE_AWAKE, - CFSPI_STATE_FETCH_PKT, - CFSPI_STATE_GET_NEXT, - CFSPI_STATE_INIT_XFER, - CFSPI_STATE_WAIT_ACTIVE, - CFSPI_STATE_SIG_ACTIVE, - CFSPI_STATE_WAIT_XFER_DONE, - CFSPI_STATE_XFER_DONE, - CFSPI_STATE_WAIT_INACTIVE, - CFSPI_STATE_SIG_INACTIVE, - CFSPI_STATE_DELIVER_PKT, - CFSPI_STATE_MAX, -}; - -/* Structure implemented by SPI physical interfaces. */ -struct cfspi { - struct caif_dev_common cfdev; - struct net_device *ndev; - struct platform_device *pdev; - struct sk_buff_head qhead; - struct sk_buff_head chead; - u16 cmd; - u16 tx_cpck_len; - u16 tx_npck_len; - u16 rx_cpck_len; - u16 rx_npck_len; - struct cfspi_ifc ifc; - struct cfspi_xfer xfer; - struct cfspi_dev *dev; - unsigned long state; - struct work_struct work; - struct workqueue_struct *wq; - struct list_head list; - int flow_off_sent; - u32 qd_low_mark; - u32 qd_high_mark; - struct completion comp; - wait_queue_head_t wait; - spinlock_t lock; - bool flow_stop; - bool slave; - bool slave_talked; -#ifdef CONFIG_DEBUG_FS - enum cfspi_state dbg_state; - u16 pcmd; - u16 tx_ppck_len; - u16 rx_ppck_len; - struct dentry *dbgfs_dir; - struct dentry *dbgfs_state; - struct dentry *dbgfs_frame; -#endif /* CONFIG_DEBUG_FS */ -}; - -extern int spi_frm_align; -extern int spi_up_head_align; -extern int spi_up_tail_align; -extern int spi_down_head_align; -extern int spi_down_tail_align; -extern struct platform_driver cfspi_spi_driver; - -void cfspi_dbg_state(struct cfspi *cfspi, int state); -int cfspi_xmitfrm(struct cfspi *cfspi, u8 *buf, size_t len); -int cfspi_xmitlen(struct cfspi *cfspi); -int cfspi_rxfrm(struct cfspi *cfspi, u8 *buf, size_t len); -int cfspi_spi_remove(struct platform_device *pdev); -int cfspi_spi_probe(struct platform_device *pdev); -int cfspi_xmitfrm(struct cfspi *cfspi, u8 *buf, size_t len); -int cfspi_xmitlen(struct cfspi *cfspi); -int cfspi_rxfrm(struct cfspi *cfspi, u8 *buf, size_t len); -void cfspi_xfer(struct work_struct *work); - -#endif /* CAIF_SPI_H_ */