litmus-rt.git - The LITMUS^RT kernel.

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Diffstat (limited to 'include/linux/signal.h')

0 files changed, 0 insertions, 0 deletions

/* * Copyright (C) 2007 Wolfgang Grandegger <wg@grandegger.com> * Copyright (C) 2008 Markus Plessing <plessing@ems-wuensche.com> * Copyright (C) 2008 Sebastian Haas <haas@ems-wuensche.com> * * 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 <linux/kernel.h> #include <linux/module.h> #include <linux/interrupt.h> #include <linux/netdevice.h> #include <linux/delay.h> #include <linux/pci.h> #include <linux/can.h> #include <linux/can/dev.h> #include <linux/io.h> #include "sja1000.h" #define DRV_NAME "ems_pci" MODULE_AUTHOR("Sebastian Haas <haas@ems-wuenche.com>"); 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(const struct net_device *dev, int port) { return readb((void __iomem *)dev->base_addr + (port * EMS_PCI_PORT_BYTES)); } static void ems_pci_write_reg(const 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(const 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; priv->irq_flags = IRQF_SHARED; 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.clock.freq = 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);


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