From patchwork Thu Feb 19 19:01:20 2009 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Wolfgang Grandegger X-Patchwork-Id: 23445 X-Patchwork-Delegate: davem@davemloft.net Return-Path: X-Original-To: patchwork-incoming@ozlabs.org Delivered-To: patchwork-incoming@ozlabs.org Received: from vger.kernel.org (vger.kernel.org [209.132.176.167]) by ozlabs.org (Postfix) with ESMTP id 0E48FDDDA0 for ; Fri, 20 Feb 2009 06:02:43 +1100 (EST) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1758396AbZBSTCP (ORCPT ); Thu, 19 Feb 2009 14:02:15 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1754764AbZBSTCJ (ORCPT ); Thu, 19 Feb 2009 14:02:09 -0500 Received: from mail-out.m-online.net ([212.18.0.10]:36626 "EHLO mail-out.m-online.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753562AbZBSTBd (ORCPT ); Thu, 19 Feb 2009 14:01:33 -0500 Received: from mail01.m-online.net (mail.m-online.net [192.168.3.149]) by mail-out.m-online.net (Postfix) with ESMTP id 8CAB21C09BC7; Thu, 19 Feb 2009 20:01:31 +0100 (CET) X-Auth-Info: TIoLaEcKJcXeBVCqmRoER86zy4PVmJU5hs6jiJLhkrg= Received: from localhost.localdomain (p4FE64D99.dip.t-dialin.net [79.230.77.153]) by smtp-auth.mnet-online.de (Postfix) with ESMTP id EDC14901CD; Thu, 19 Feb 2009 20:01:30 +0100 (CET) From: Wolfgang Grandegger To: netdev@vger.kernel.org Cc: linux-kernel@vger.kernel.org, Wolfgang Grandegger , Sebastian Haas , Markus Plessing Subject: [PATCH 6/8] can: SJA1000 driver for EMS PCI cards Date: Thu, 19 Feb 2009 20:01:20 +0100 Message-Id: <1235070082-7069-7-git-send-email-wg@grandegger.com> X-Mailer: git-send-email 1.5.6.6 In-Reply-To: <1235070082-7069-6-git-send-email-wg@grandegger.com> References: <1235070082-7069-1-git-send-email-wg@grandegger.com> <1235070082-7069-2-git-send-email-wg@grandegger.com> <1235070082-7069-3-git-send-email-wg@grandegger.com> <1235070082-7069-4-git-send-email-wg@grandegger.com> <1235070082-7069-5-git-send-email-wg@grandegger.com> <1235070082-7069-6-git-send-email-wg@grandegger.com> Sender: netdev-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: netdev@vger.kernel.org The patch adds support for the one or two channel CPC-PCI and CPC-PCIe cards from EMS Dr. Thomas Wuensche (http://www.ems-wuensche.de). Signed-off-by: Sebastian Haas Signed-off-by: Markus Plessing Signed-off-by: Wolfgang Grandegger --- drivers/net/can/Kconfig | 7 + drivers/net/can/sja1000/Makefile | 1 + drivers/net/can/sja1000/ems_pci.c | 328 +++++++++++++++++++++++++++++++++++++ 3 files changed, 336 insertions(+), 0 deletions(-) create mode 100644 drivers/net/can/sja1000/ems_pci.c diff --git a/drivers/net/can/Kconfig b/drivers/net/can/Kconfig index d6dee40..4e6887e 100644 --- a/drivers/net/can/Kconfig +++ b/drivers/net/can/Kconfig @@ -56,6 +56,13 @@ config CAN_SJA1000_PLATFORM boards from Phytec (http://www.phytec.de) like the PCM027, PCM038. +config CAN_EMS_PCI + tristate "EMS CPC-PCI and CPC-PCIe Card" + depends on PCI && CAN_SJA1000 + ---help--- + This driver is for the one or two channel CPC-PCI and CPC-PCIe + cards from EMS Dr. Thomas Wuensche (http://www.ems-wuensche.de). + config CAN_DEBUG_DEVICES bool "CAN devices debugging messages" depends on CAN diff --git a/drivers/net/can/sja1000/Makefile b/drivers/net/can/sja1000/Makefile index 5115cc9..7772dd2 100644 --- a/drivers/net/can/sja1000/Makefile +++ b/drivers/net/can/sja1000/Makefile @@ -4,5 +4,6 @@ obj-$(CONFIG_CAN_SJA1000) += sja1000.o obj-$(CONFIG_CAN_SJA1000_PLATFORM) += sja1000_platform.o +obj-$(CONFIG_CAN_EMS_PCI) += ems_pci.o ccflags-$(CONFIG_CAN_DEBUG_DEVICES) := -DDEBUG diff --git a/drivers/net/can/sja1000/ems_pci.c b/drivers/net/can/sja1000/ems_pci.c new file mode 100644 index 0000000..6076375 --- /dev/null +++ b/drivers/net/can/sja1000/ems_pci.c @@ -0,0 +1,328 @@ +/* + * Copyright (C) 2007 Wolfgang Grandegger + * Copyright (C) 2008 Markus Plessing + * Copyright (C) 2008 Sebastian Haas + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the version 2 of the GNU General Public License + * as published by the Free Software Foundation + * + * 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. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write to the Free Software Foundation, + * Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. + */ + +#include +#include +#include +#include +#include +#include +#include +#include +#include + +#include "sja1000.h" + +#define DRV_NAME "ems_pci" + +MODULE_AUTHOR("Sebastian Haas "); +MODULE_DESCRIPTION("Socket-CAN driver for EMS CPC-PCI/PCIe CAN cards"); +MODULE_SUPPORTED_DEVICE("EMS CPC-PCI/PCIe CAN card"); +MODULE_LICENSE("GPL v2"); + +#define EMS_PCI_MAX_CHAN 2 + +struct ems_pci_card { + int channels; + + struct pci_dev *pci_dev; + struct net_device *net_dev[EMS_PCI_MAX_CHAN]; + + void __iomem *conf_addr; + void __iomem *base_addr; +}; + +#define EMS_PCI_CAN_CLOCK (16000000 / 2) + +/* + * Register definitions and descriptions are from LinCAN 0.3.3. + * + * PSB4610 PITA-2 bridge control registers + */ +#define PITA2_ICR 0x00 /* Interrupt Control Register */ +#define PITA2_ICR_INT0 0x00000002 /* [RC] INT0 Active/Clear */ +#define PITA2_ICR_INT0_EN 0x00020000 /* [RW] Enable INT0 */ + +#define PITA2_MISC 0x1c /* Miscellaneous Register */ +#define PITA2_MISC_CONFIG 0x04000000 /* Multiplexed parallel interface */ + +/* + * The board configuration is probably following: + * RX1 is connected to ground. + * TX1 is not connected. + * CLKO is not connected. + * Setting the OCR register to 0xDA is a good idea. + * This means normal output mode , push-pull and the correct polarity. + */ +#define EMS_PCI_OCR (OCR_TX0_PUSHPULL | OCR_TX1_PUSHPULL) + +/* + * In the CDR register, you should set CBP to 1. + * You will probably also want to set the clock divider value to 7 + * (meaning direct oscillator output) because the second SJA1000 chip + * is driven by the first one CLKOUT output. + */ +#define EMS_PCI_CDR (CDR_CBP | CDR_CLKOUT_MASK) +#define EMS_PCI_MEM_SIZE 4096 /* Size of the remapped io-memory */ +#define EMS_PCI_CAN_BASE_OFFSET 0x400 /* offset where the controllers starts */ +#define EMS_PCI_CAN_CTRL_SIZE 0x200 /* memory size for each controller */ + +#define EMS_PCI_PORT_BYTES 0x4 /* Each register occupies 4 bytes */ + +#define EMS_PCI_VENDOR_ID 0x110a /* PCI device and vendor ID */ +#define EMS_PCI_DEVICE_ID 0x2104 + +static struct pci_device_id ems_pci_tbl[] = { + {EMS_PCI_VENDOR_ID, EMS_PCI_DEVICE_ID, PCI_ANY_ID, PCI_ANY_ID,}, + {0,} +}; +MODULE_DEVICE_TABLE(pci, ems_pci_tbl); + +/* + * Helper to read internal registers from card logic (not CAN) + */ +static u8 ems_pci_readb(struct ems_pci_card *card, unsigned int port) +{ + return readb((void __iomem *)card->base_addr + + (port * EMS_PCI_PORT_BYTES)); +} + +static u8 ems_pci_read_reg(struct net_device *dev, int port) +{ + return readb((void __iomem *)dev->base_addr + + (port * EMS_PCI_PORT_BYTES)); +} + +static void ems_pci_write_reg(struct net_device *dev, int port, u8 val) +{ + writeb(val, (void __iomem *)dev->base_addr + + (port * EMS_PCI_PORT_BYTES)); +} + +static void ems_pci_post_irq(struct net_device *dev) +{ + struct sja1000_priv *priv = netdev_priv(dev); + struct ems_pci_card *card = (struct ems_pci_card *)priv->priv; + + /* reset int flag of pita */ + writel(PITA2_ICR_INT0_EN | PITA2_ICR_INT0, card->conf_addr + + PITA2_ICR); +} + +/* + * Check if a CAN controller is present at the specified location + * by trying to set 'em into the PeliCAN mode + */ +static inline int ems_pci_check_chan(struct net_device *dev) +{ + unsigned char res; + + /* Make sure SJA1000 is in reset mode */ + ems_pci_write_reg(dev, REG_MOD, 1); + + ems_pci_write_reg(dev, REG_CDR, CDR_PELICAN); + + /* read reset-values */ + res = ems_pci_read_reg(dev, REG_CDR); + + if (res == CDR_PELICAN) + return 1; + + return 0; +} + +static void ems_pci_del_card(struct pci_dev *pdev) +{ + struct ems_pci_card *card = pci_get_drvdata(pdev); + struct net_device *dev; + int i = 0; + + for (i = 0; i < card->channels; i++) { + dev = card->net_dev[i]; + + if (!dev) + continue; + + dev_info(&pdev->dev, "Removing %s.\n", dev->name); + unregister_sja1000dev(dev); + free_sja1000dev(dev); + } + + if (card->base_addr != NULL) + pci_iounmap(card->pci_dev, card->base_addr); + + if (card->conf_addr != NULL) + pci_iounmap(card->pci_dev, card->conf_addr); + + kfree(card); + + pci_disable_device(pdev); + pci_set_drvdata(pdev, NULL); +} + +static void ems_pci_card_reset(struct ems_pci_card *card) +{ + /* Request board reset */ + writeb(0, card->base_addr); +} + +/* + * Probe PCI device for EMS CAN signature and register each available + * CAN channel to SJA1000 Socket-CAN subsystem. + */ +static int __devinit ems_pci_add_card(struct pci_dev *pdev, + const struct pci_device_id *ent) +{ + struct sja1000_priv *priv; + struct net_device *dev; + struct ems_pci_card *card; + int err, i; + + /* Enabling PCI device */ + if (pci_enable_device(pdev) < 0) { + dev_err(&pdev->dev, "Enabling PCI device failed\n"); + return -ENODEV; + } + + /* Allocating card structures to hold addresses, ... */ + card = kzalloc(sizeof(struct ems_pci_card), GFP_KERNEL); + if (card == NULL) { + dev_err(&pdev->dev, "Unable to allocate memory\n"); + pci_disable_device(pdev); + return -ENOMEM; + } + + pci_set_drvdata(pdev, card); + + card->pci_dev = pdev; + + card->channels = 0; + + /* Remap PITA configuration space, and controller memory area */ + card->conf_addr = pci_iomap(pdev, 0, EMS_PCI_MEM_SIZE); + if (card->conf_addr == NULL) { + err = -ENOMEM; + + goto failure_cleanup; + } + + card->base_addr = pci_iomap(pdev, 1, EMS_PCI_MEM_SIZE); + if (card->base_addr == NULL) { + err = -ENOMEM; + + goto failure_cleanup; + } + + /* Configure PITA-2 parallel interface (enable MUX) */ + writel(PITA2_MISC_CONFIG, card->conf_addr + PITA2_MISC); + + /* Check for unique EMS CAN signature */ + if (ems_pci_readb(card, 0) != 0x55 || + ems_pci_readb(card, 1) != 0xAA || + ems_pci_readb(card, 2) != 0x01 || + ems_pci_readb(card, 3) != 0xCB || + ems_pci_readb(card, 4) != 0x11) { + dev_err(&pdev->dev, "Not EMS Dr. Thomas Wuensche interface\n"); + + err = -ENODEV; + goto failure_cleanup; + } + + ems_pci_card_reset(card); + + /* Detect available channels */ + for (i = 0; i < EMS_PCI_MAX_CHAN; i++) { + dev = alloc_sja1000dev(0); + if (dev == NULL) { + err = -ENOMEM; + goto failure_cleanup; + } + + card->net_dev[i] = dev; + priv = netdev_priv(dev); + priv->priv = card; + + dev->irq = pdev->irq; + dev->base_addr = (unsigned long)(card->base_addr + + EMS_PCI_CAN_BASE_OFFSET + + (i * EMS_PCI_CAN_CTRL_SIZE)); + + /* Check if channel is present */ + if (ems_pci_check_chan(dev)) { + priv->read_reg = ems_pci_read_reg; + priv->write_reg = ems_pci_write_reg; + priv->post_irq = ems_pci_post_irq; + priv->can.bittiming.clock = EMS_PCI_CAN_CLOCK; + priv->ocr = EMS_PCI_OCR; + priv->cdr = EMS_PCI_CDR; + + SET_NETDEV_DEV(dev, &pdev->dev); + + /* Enable interrupts from card */ + writel(PITA2_ICR_INT0_EN, card->conf_addr + PITA2_ICR); + + /* Register SJA1000 device */ + err = register_sja1000dev(dev); + if (err) { + dev_err(&pdev->dev, "Registering device failed " + "(err=%d)\n", err); + free_sja1000dev(dev); + goto failure_cleanup; + } + + card->channels++; + + dev_info(&pdev->dev, "Channel #%d at %#lX, irq %d\n", + i + 1, dev->base_addr, + dev->irq); + } else { + free_sja1000dev(dev); + } + } + + return 0; + +failure_cleanup: + dev_err(&pdev->dev, "Error: %d. Cleaning Up.\n", err); + + ems_pci_del_card(pdev); + + return err; +} + +static struct pci_driver ems_pci_driver = { + .name = DRV_NAME, + .id_table = ems_pci_tbl, + .probe = ems_pci_add_card, + .remove = ems_pci_del_card, +}; + +static int __init ems_pci_init(void) +{ + return pci_register_driver(&ems_pci_driver); +} + +static void __exit ems_pci_exit(void) +{ + pci_unregister_driver(&ems_pci_driver); +} + +module_init(ems_pci_init); +module_exit(ems_pci_exit); +