can: SJA1000 driver for EMS PCI cards
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 <haas@ems-wuensche.com> Signed-off-by: Markus Plessing <plessing@ems-wuensche.com> Signed-off-by: Wolfgang Grandegger <wg@grandegger.com> Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Wolfgang Grandegger
David S. Miller
parent
f534e52f09
commit
a61a8423c7
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@ -51,6 +51,13 @@ config CAN_SJA1000_PLATFORM
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boards from Phytec (http://www.phytec.de) like the PCM027,
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PCM038.
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config CAN_EMS_PCI
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tristate "EMS CPC-PCI and CPC-PCIe Card"
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depends on PCI && CAN_SJA1000
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---help---
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This driver is for the one or two channel CPC-PCI and CPC-PCIe
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cards from EMS Dr. Thomas Wuensche (http://www.ems-wuensche.de).
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config CAN_DEBUG_DEVICES
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bool "CAN devices debugging messages"
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depends on CAN
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@ -4,5 +4,6 @@
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obj-$(CONFIG_CAN_SJA1000) += sja1000.o
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obj-$(CONFIG_CAN_SJA1000_PLATFORM) += sja1000_platform.o
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obj-$(CONFIG_CAN_EMS_PCI) += ems_pci.o
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ccflags-$(CONFIG_CAN_DEBUG_DEVICES) := -DDEBUG
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@ -0,0 +1,329 @@
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/*
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* Copyright (C) 2007 Wolfgang Grandegger <wg@grandegger.com>
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* Copyright (C) 2008 Markus Plessing <plessing@ems-wuensche.com>
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* Copyright (C) 2008 Sebastian Haas <haas@ems-wuensche.com>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the version 2 of the GNU General Public License
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* as published by the Free Software Foundation
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software Foundation,
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* Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
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*/
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/interrupt.h>
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#include <linux/netdevice.h>
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#include <linux/delay.h>
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#include <linux/pci.h>
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#include <linux/can.h>
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#include <linux/can/dev.h>
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#include <linux/io.h>
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#include "sja1000.h"
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#define DRV_NAME "ems_pci"
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MODULE_AUTHOR("Sebastian Haas <haas@ems-wuenche.com>");
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MODULE_DESCRIPTION("Socket-CAN driver for EMS CPC-PCI/PCIe CAN cards");
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MODULE_SUPPORTED_DEVICE("EMS CPC-PCI/PCIe CAN card");
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MODULE_LICENSE("GPL v2");
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#define EMS_PCI_MAX_CHAN 2
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struct ems_pci_card {
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int channels;
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struct pci_dev *pci_dev;
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struct net_device *net_dev[EMS_PCI_MAX_CHAN];
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void __iomem *conf_addr;
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void __iomem *base_addr;
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};
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#define EMS_PCI_CAN_CLOCK (16000000 / 2)
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/*
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* Register definitions and descriptions are from LinCAN 0.3.3.
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*
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* PSB4610 PITA-2 bridge control registers
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*/
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#define PITA2_ICR 0x00 /* Interrupt Control Register */
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#define PITA2_ICR_INT0 0x00000002 /* [RC] INT0 Active/Clear */
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#define PITA2_ICR_INT0_EN 0x00020000 /* [RW] Enable INT0 */
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#define PITA2_MISC 0x1c /* Miscellaneous Register */
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#define PITA2_MISC_CONFIG 0x04000000 /* Multiplexed parallel interface */
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/*
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* The board configuration is probably following:
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* RX1 is connected to ground.
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* TX1 is not connected.
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* CLKO is not connected.
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* Setting the OCR register to 0xDA is a good idea.
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* This means normal output mode , push-pull and the correct polarity.
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*/
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#define EMS_PCI_OCR (OCR_TX0_PUSHPULL | OCR_TX1_PUSHPULL)
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/*
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* In the CDR register, you should set CBP to 1.
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* You will probably also want to set the clock divider value to 7
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* (meaning direct oscillator output) because the second SJA1000 chip
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* is driven by the first one CLKOUT output.
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*/
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#define EMS_PCI_CDR (CDR_CBP | CDR_CLKOUT_MASK)
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#define EMS_PCI_MEM_SIZE 4096 /* Size of the remapped io-memory */
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#define EMS_PCI_CAN_BASE_OFFSET 0x400 /* offset where the controllers starts */
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#define EMS_PCI_CAN_CTRL_SIZE 0x200 /* memory size for each controller */
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#define EMS_PCI_PORT_BYTES 0x4 /* Each register occupies 4 bytes */
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#define EMS_PCI_VENDOR_ID 0x110a /* PCI device and vendor ID */
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#define EMS_PCI_DEVICE_ID 0x2104
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static struct pci_device_id ems_pci_tbl[] = {
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{EMS_PCI_VENDOR_ID, EMS_PCI_DEVICE_ID, PCI_ANY_ID, PCI_ANY_ID,},
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{0,}
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};
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MODULE_DEVICE_TABLE(pci, ems_pci_tbl);
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/*
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* Helper to read internal registers from card logic (not CAN)
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*/
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static u8 ems_pci_readb(struct ems_pci_card *card, unsigned int port)
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{
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return readb((void __iomem *)card->base_addr
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+ (port * EMS_PCI_PORT_BYTES));
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}
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static u8 ems_pci_read_reg(const struct net_device *dev, int port)
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{
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return readb((void __iomem *)dev->base_addr
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+ (port * EMS_PCI_PORT_BYTES));
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}
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static void ems_pci_write_reg(const struct net_device *dev, int port, u8 val)
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{
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writeb(val, (void __iomem *)dev->base_addr
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+ (port * EMS_PCI_PORT_BYTES));
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}
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static void ems_pci_post_irq(const struct net_device *dev)
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{
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struct sja1000_priv *priv = netdev_priv(dev);
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struct ems_pci_card *card = (struct ems_pci_card *)priv->priv;
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/* reset int flag of pita */
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writel(PITA2_ICR_INT0_EN | PITA2_ICR_INT0, card->conf_addr
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+ PITA2_ICR);
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}
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/*
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* Check if a CAN controller is present at the specified location
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* by trying to set 'em into the PeliCAN mode
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*/
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static inline int ems_pci_check_chan(struct net_device *dev)
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{
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unsigned char res;
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/* Make sure SJA1000 is in reset mode */
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ems_pci_write_reg(dev, REG_MOD, 1);
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ems_pci_write_reg(dev, REG_CDR, CDR_PELICAN);
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/* read reset-values */
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res = ems_pci_read_reg(dev, REG_CDR);
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if (res == CDR_PELICAN)
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return 1;
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return 0;
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}
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static void ems_pci_del_card(struct pci_dev *pdev)
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{
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struct ems_pci_card *card = pci_get_drvdata(pdev);
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struct net_device *dev;
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int i = 0;
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for (i = 0; i < card->channels; i++) {
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dev = card->net_dev[i];
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if (!dev)
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continue;
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dev_info(&pdev->dev, "Removing %s.\n", dev->name);
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unregister_sja1000dev(dev);
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free_sja1000dev(dev);
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}
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if (card->base_addr != NULL)
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pci_iounmap(card->pci_dev, card->base_addr);
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if (card->conf_addr != NULL)
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pci_iounmap(card->pci_dev, card->conf_addr);
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kfree(card);
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pci_disable_device(pdev);
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pci_set_drvdata(pdev, NULL);
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}
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static void ems_pci_card_reset(struct ems_pci_card *card)
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{
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/* Request board reset */
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writeb(0, card->base_addr);
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}
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/*
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* Probe PCI device for EMS CAN signature and register each available
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* CAN channel to SJA1000 Socket-CAN subsystem.
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*/
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static int __devinit ems_pci_add_card(struct pci_dev *pdev,
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const struct pci_device_id *ent)
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{
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struct sja1000_priv *priv;
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struct net_device *dev;
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struct ems_pci_card *card;
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int err, i;
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/* Enabling PCI device */
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if (pci_enable_device(pdev) < 0) {
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dev_err(&pdev->dev, "Enabling PCI device failed\n");
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return -ENODEV;
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}
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/* Allocating card structures to hold addresses, ... */
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card = kzalloc(sizeof(struct ems_pci_card), GFP_KERNEL);
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if (card == NULL) {
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dev_err(&pdev->dev, "Unable to allocate memory\n");
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pci_disable_device(pdev);
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return -ENOMEM;
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}
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pci_set_drvdata(pdev, card);
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card->pci_dev = pdev;
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card->channels = 0;
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/* Remap PITA configuration space, and controller memory area */
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card->conf_addr = pci_iomap(pdev, 0, EMS_PCI_MEM_SIZE);
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if (card->conf_addr == NULL) {
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err = -ENOMEM;
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goto failure_cleanup;
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}
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card->base_addr = pci_iomap(pdev, 1, EMS_PCI_MEM_SIZE);
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if (card->base_addr == NULL) {
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err = -ENOMEM;
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goto failure_cleanup;
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}
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/* Configure PITA-2 parallel interface (enable MUX) */
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writel(PITA2_MISC_CONFIG, card->conf_addr + PITA2_MISC);
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/* Check for unique EMS CAN signature */
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if (ems_pci_readb(card, 0) != 0x55 ||
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ems_pci_readb(card, 1) != 0xAA ||
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ems_pci_readb(card, 2) != 0x01 ||
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ems_pci_readb(card, 3) != 0xCB ||
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ems_pci_readb(card, 4) != 0x11) {
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dev_err(&pdev->dev, "Not EMS Dr. Thomas Wuensche interface\n");
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err = -ENODEV;
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goto failure_cleanup;
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}
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ems_pci_card_reset(card);
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/* Detect available channels */
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for (i = 0; i < EMS_PCI_MAX_CHAN; i++) {
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dev = alloc_sja1000dev(0);
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if (dev == NULL) {
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err = -ENOMEM;
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goto failure_cleanup;
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}
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card->net_dev[i] = dev;
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priv = netdev_priv(dev);
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priv->priv = card;
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priv->irq_flags = IRQF_SHARED;
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dev->irq = pdev->irq;
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dev->base_addr = (unsigned long)(card->base_addr
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+ EMS_PCI_CAN_BASE_OFFSET
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+ (i * EMS_PCI_CAN_CTRL_SIZE));
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/* Check if channel is present */
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if (ems_pci_check_chan(dev)) {
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priv->read_reg = ems_pci_read_reg;
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priv->write_reg = ems_pci_write_reg;
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priv->post_irq = ems_pci_post_irq;
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priv->can.clock.freq = EMS_PCI_CAN_CLOCK;
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priv->ocr = EMS_PCI_OCR;
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priv->cdr = EMS_PCI_CDR;
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SET_NETDEV_DEV(dev, &pdev->dev);
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/* Enable interrupts from card */
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writel(PITA2_ICR_INT0_EN, card->conf_addr + PITA2_ICR);
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/* Register SJA1000 device */
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err = register_sja1000dev(dev);
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if (err) {
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dev_err(&pdev->dev, "Registering device failed "
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"(err=%d)\n", err);
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free_sja1000dev(dev);
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goto failure_cleanup;
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}
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card->channels++;
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dev_info(&pdev->dev, "Channel #%d at %#lX, irq %d\n",
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i + 1, dev->base_addr,
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dev->irq);
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} else {
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free_sja1000dev(dev);
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}
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}
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return 0;
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failure_cleanup:
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dev_err(&pdev->dev, "Error: %d. Cleaning Up.\n", err);
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ems_pci_del_card(pdev);
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return err;
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}
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static struct pci_driver ems_pci_driver = {
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.name = DRV_NAME,
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.id_table = ems_pci_tbl,
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.probe = ems_pci_add_card,
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.remove = ems_pci_del_card,
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};
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static int __init ems_pci_init(void)
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{
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return pci_register_driver(&ems_pci_driver);
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}
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static void __exit ems_pci_exit(void)
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{
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pci_unregister_driver(&ems_pci_driver);
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}
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module_init(ems_pci_init);
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module_exit(ems_pci_exit);
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