--- /dev/null
+/*
+ * Copyright (C) 2008-2010 Pavel Cheblakov <P.B.Cheblakov@inp.nsk.su>
+ *
+ * Derived from the ems_pci.c driver:
+ * 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 "sja1000_plx_pci"
+
+MODULE_AUTHOR("Pavel Cheblakov <P.B.Cheblakov@inp.nsk.su>");
+MODULE_DESCRIPTION("Socket-CAN driver for PLX90xx PCI-bridge cards with "
+ "the SJA1000 chips");
+MODULE_SUPPORTED_DEVICE("Adlink PCI-7841/cPCI-7841, "
+ "Adlink PCI-7841/cPCI-7841 SE, "
+ "Marathon CAN-bus-PCI, "
+ "TEWS TECHNOLOGIES TPMC810");
+MODULE_LICENSE("GPL v2");
+
+#define PLX_PCI_MAX_CHAN 2
+
+struct plx_pci_card {
+ int channels; /* detected channels count */
+ struct net_device *net_dev[PLX_PCI_MAX_CHAN];
+ void __iomem *conf_addr;
+};
+
+#define PLX_PCI_CAN_CLOCK (16000000 / 2)
+
+/* PLX90xx registers */
+#define PLX_INTCSR 0x4c /* Interrupt Control/Status */
+#define PLX_CNTRL 0x50 /* User I/O, Direct Slave Response,
+ * Serial EEPROM, and Initialization
+ * Control register
+ */
+
+#define PLX_LINT1_EN 0x1 /* Local interrupt 1 enable */
+#define PLX_LINT2_EN (1 << 3) /* Local interrupt 2 enable */
+#define PLX_PCI_INT_EN (1 << 6) /* PCI Interrupt Enable */
+#define PLX_PCI_RESET (1 << 30) /* PCI Adapter Software Reset */
+
+/*
+ * 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 PLX_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 PLX_PCI_CDR (CDR_CBP | CDR_CLKOUT_MASK)
+
+/* SJA1000 Control Register in the BasicCAN Mode */
+#define REG_CR 0x00
+
+/* States of some SJA1000 registers after hardware reset in the BasicCAN mode*/
+#define REG_CR_BASICCAN_INITIAL 0x21
+#define REG_CR_BASICCAN_INITIAL_MASK 0xa1
+#define REG_SR_BASICCAN_INITIAL 0x0c
+#define REG_IR_BASICCAN_INITIAL 0xe0
+
+/* States of some SJA1000 registers after hardware reset in the PeliCAN mode*/
+#define REG_MOD_PELICAN_INITIAL 0x01
+#define REG_SR_PELICAN_INITIAL 0x3c
+#define REG_IR_PELICAN_INITIAL 0x00
+
+#define ADLINK_PCI_VENDOR_ID 0x144A
+#define ADLINK_PCI_DEVICE_ID 0x7841
+
+#define MARATHON_PCI_DEVICE_ID 0x2715
+
+#define TEWS_PCI_VENDOR_ID 0x1498
+#define TEWS_PCI_DEVICE_ID_TMPC810 0x032A
+
+static void plx_pci_reset_common(struct pci_dev *pdev);
+static void plx_pci_reset_marathon(struct pci_dev *pdev);
+
+struct plx_pci_channel_map {
+ u32 bar;
+ u32 offset;
+ u32 size; /* 0x00 - auto, e.g. length of entire bar */
+};
+
+struct plx_pci_card_info {
+ const char *name;
+ int channel_count;
+ u32 can_clock;
+ u8 ocr; /* output control register */
+ u8 cdr; /* clock divider register */
+
+ /* Parameters for mapping local configuration space */
+ struct plx_pci_channel_map conf_map;
+
+ /* Parameters for mapping the SJA1000 chips */
+ struct plx_pci_channel_map chan_map_tbl[PLX_PCI_MAX_CHAN];
+
+ /* Pointer to device-dependent reset function */
+ void (*reset_func)(struct pci_dev *pdev);
+};
+
+static struct plx_pci_card_info plx_pci_card_info_adlink __devinitdata = {
+ "Adlink PCI-7841/cPCI-7841", 2,
+ PLX_PCI_CAN_CLOCK, PLX_PCI_OCR, PLX_PCI_CDR,
+ {1, 0x00, 0x00}, { {2, 0x00, 0x80}, {2, 0x80, 0x80} },
+ &plx_pci_reset_common
+ /* based on PLX9052 */
+};
+
+static struct plx_pci_card_info plx_pci_card_info_adlink_se __devinitdata = {
+ "Adlink PCI-7841/cPCI-7841 SE", 2,
+ PLX_PCI_CAN_CLOCK, PLX_PCI_OCR, PLX_PCI_CDR,
+ {0, 0x00, 0x00}, { {2, 0x00, 0x80}, {2, 0x80, 0x80} },
+ &plx_pci_reset_common
+ /* based on PLX9052 */
+};
+
+static struct plx_pci_card_info plx_pci_card_info_marathon __devinitdata = {
+ "Marathon CAN-bus-PCI", 2,
+ PLX_PCI_CAN_CLOCK, PLX_PCI_OCR, PLX_PCI_CDR,
+ {0, 0x00, 0x00}, { {2, 0x00, 0x00}, {4, 0x00, 0x00} },
+ &plx_pci_reset_marathon
+ /* based on PLX9052 */
+};
+
+static struct plx_pci_card_info plx_pci_card_info_tews __devinitdata = {
+ "TEWS TECHNOLOGIES TPMC810", 2,
+ PLX_PCI_CAN_CLOCK, PLX_PCI_OCR, PLX_PCI_CDR,
+ {0, 0x00, 0x00}, { {2, 0x000, 0x80}, {2, 0x100, 0x80} },
+ &plx_pci_reset_common
+ /* based on PLX9030 */
+};
+
+static DEFINE_PCI_DEVICE_TABLE(plx_pci_tbl) = {
+ {
+ /* Adlink PCI-7841/cPCI-7841 */
+ ADLINK_PCI_VENDOR_ID, ADLINK_PCI_DEVICE_ID,
+ PCI_ANY_ID, PCI_ANY_ID,
+ PCI_CLASS_NETWORK_OTHER << 8, ~0,
+ (kernel_ulong_t)&plx_pci_card_info_adlink
+ },
+ {
+ /* Adlink PCI-7841/cPCI-7841 SE */
+ ADLINK_PCI_VENDOR_ID, ADLINK_PCI_DEVICE_ID,
+ PCI_ANY_ID, PCI_ANY_ID,
+ PCI_CLASS_COMMUNICATION_OTHER << 8, ~0,
+ (kernel_ulong_t)&plx_pci_card_info_adlink_se
+ },
+ {
+ /* Marathon CAN-bus-PCI card */
+ PCI_VENDOR_ID_PLX, MARATHON_PCI_DEVICE_ID,
+ PCI_ANY_ID, PCI_ANY_ID,
+ 0, 0,
+ (kernel_ulong_t)&plx_pci_card_info_marathon
+ },
+ {
+ /* TEWS TECHNOLOGIES TPMC810 card */
+ TEWS_PCI_VENDOR_ID, TEWS_PCI_DEVICE_ID_TMPC810,
+ PCI_ANY_ID, PCI_ANY_ID,
+ 0, 0,
+ (kernel_ulong_t)&plx_pci_card_info_tews
+ },
+ { 0,}
+};
+MODULE_DEVICE_TABLE(pci, plx_pci_tbl);
+
+static u8 plx_pci_read_reg(const struct sja1000_priv *priv, int port)
+{
+ return ioread8(priv->reg_base + port);
+}
+
+static void plx_pci_write_reg(const struct sja1000_priv *priv, int port, u8 val)
+{
+ iowrite8(val, priv->reg_base + port);
+}
+
+/*
+ * Check if a CAN controller is present at the specified location
+ * by trying to switch 'em from the Basic mode into the PeliCAN mode.
+ * Also check states of some registers in reset mode.
+ */
+static inline int plx_pci_check_sja1000(const struct sja1000_priv *priv)
+{
+ int flag = 0;
+
+ /*
+ * Check registers after hardware reset (the Basic mode)
+ * See states on p. 10 of the Datasheet.
+ */
+ if ((priv->read_reg(priv, REG_CR) & REG_CR_BASICCAN_INITIAL_MASK) ==
+ REG_CR_BASICCAN_INITIAL &&
+ (priv->read_reg(priv, REG_SR) == REG_SR_BASICCAN_INITIAL) &&
+ (priv->read_reg(priv, REG_IR) == REG_IR_BASICCAN_INITIAL))
+ flag = 1;
+
+ /* Bring the SJA1000 into the PeliCAN mode*/
+ priv->write_reg(priv, REG_CDR, CDR_PELICAN);
+
+ /*
+ * Check registers after reset in the PeliCAN mode.
+ * See states on p. 23 of the Datasheet.
+ */
+ if (priv->read_reg(priv, REG_MOD) == REG_MOD_PELICAN_INITIAL &&
+ priv->read_reg(priv, REG_SR) == REG_SR_PELICAN_INITIAL &&
+ priv->read_reg(priv, REG_IR) == REG_IR_PELICAN_INITIAL)
+ return flag;
+
+ return 0;
+}
+
+/*
+ * PLX90xx software reset
+ * Also LRESET# asserts and brings to reset device on the Local Bus (if wired).
+ * For most cards it's enough for reset the SJA1000 chips.
+ */
+static void plx_pci_reset_common(struct pci_dev *pdev)
+{
+ struct plx_pci_card *card = pci_get_drvdata(pdev);
+ u32 cntrl;
+
+ cntrl = ioread32(card->conf_addr + PLX_CNTRL);
+ cntrl |= PLX_PCI_RESET;
+ iowrite32(cntrl, card->conf_addr + PLX_CNTRL);
+ udelay(100);
+ cntrl ^= PLX_PCI_RESET;
+ iowrite32(cntrl, card->conf_addr + PLX_CNTRL);
+};
+
+/* Special reset function for Marathon card */
+static void plx_pci_reset_marathon(struct pci_dev *pdev)
+{
+ void __iomem *reset_addr;
+ int i;
+ int reset_bar[2] = {3, 5};
+
+ plx_pci_reset_common(pdev);
+
+ for (i = 0; i < 2; i++) {
+ reset_addr = pci_iomap(pdev, reset_bar[i], 0);
+ if (!reset_addr) {
+ dev_err(&pdev->dev, "Failed to remap reset "
+ "space %d (BAR%d)\n", i, reset_bar[i]);
+ } else {
+ /* reset the SJA1000 chip */
+ iowrite8(0x1, reset_addr);
+ udelay(100);
+ pci_iounmap(pdev, reset_addr);
+ }
+ }
+}
+
+static void plx_pci_del_card(struct pci_dev *pdev)
+{
+ struct plx_pci_card *card = pci_get_drvdata(pdev);
+ struct net_device *dev;
+ struct sja1000_priv *priv;
+ 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);
+ priv = netdev_priv(dev);
+ if (priv->reg_base)
+ pci_iounmap(pdev, priv->reg_base);
+ free_sja1000dev(dev);
+ }
+
+ plx_pci_reset_common(pdev);
+
+ /*
+ * Disable interrupts from PCI-card (PLX90xx) and disable Local_1,
+ * Local_2 interrupts
+ */
+ iowrite32(0x0, card->conf_addr + PLX_INTCSR);
+
+ if (card->conf_addr)
+ pci_iounmap(pdev, card->conf_addr);
+
+ kfree(card);
+
+ pci_disable_device(pdev);
+ pci_set_drvdata(pdev, NULL);
+}
+
+/*
+ * Probe PLX90xx based device for the SJA1000 chips and register each
+ * available CAN channel to SJA1000 Socket-CAN subsystem.
+ */
+static int __devinit plx_pci_add_card(struct pci_dev *pdev,
+ const struct pci_device_id *ent)
+{
+ struct sja1000_priv *priv;
+ struct net_device *dev;
+ struct plx_pci_card *card;
+ struct plx_pci_card_info *ci;
+ int err, i;
+ u32 val;
+ void __iomem *addr;
+
+ ci = (struct plx_pci_card_info *)ent->driver_data;
+
+ if (pci_enable_device(pdev) < 0) {
+ dev_err(&pdev->dev, "Failed to enable PCI device\n");
+ return -ENODEV;
+ }
+
+ dev_info(&pdev->dev, "Detected \"%s\" card at slot #%i\n",
+ ci->name, PCI_SLOT(pdev->devfn));
+
+ /* Allocate card structures to hold addresses, ... */
+ card = kzalloc(sizeof(*card), GFP_KERNEL);
+ if (!card) {
+ dev_err(&pdev->dev, "Unable to allocate memory\n");
+ pci_disable_device(pdev);
+ return -ENOMEM;
+ }
+
+ pci_set_drvdata(pdev, card);
+
+ card->channels = 0;
+
+ /* Remap PLX90xx configuration space */
+ addr = pci_iomap(pdev, ci->conf_map.bar, ci->conf_map.size);
+ if (!addr) {
+ err = -ENOMEM;
+ dev_err(&pdev->dev, "Failed to remap configuration space "
+ "(BAR%d)\n", ci->conf_map.bar);
+ goto failure_cleanup;
+ }
+ card->conf_addr = addr + ci->conf_map.offset;
+
+ ci->reset_func(pdev);
+
+ /* Detect available channels */
+ for (i = 0; i < ci->channel_count; i++) {
+ struct plx_pci_channel_map *cm = &ci->chan_map_tbl[i];
+
+ dev = alloc_sja1000dev(0);
+ if (!dev) {
+ 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;
+
+ /*
+ * Remap IO space of the SJA1000 chips
+ * This is device-dependent mapping
+ */
+ addr = pci_iomap(pdev, cm->bar, cm->size);
+ if (!addr) {
+ err = -ENOMEM;
+ dev_err(&pdev->dev, "Failed to remap BAR%d\n", cm->bar);
+ goto failure_cleanup;
+ }
+
+ priv->reg_base = addr + cm->offset;
+ priv->read_reg = plx_pci_read_reg;
+ priv->write_reg = plx_pci_write_reg;
+
+ /* Check if channel is present */
+ if (plx_pci_check_sja1000(priv)) {
+ priv->can.clock.freq = ci->can_clock;
+ priv->ocr = ci->ocr;
+ priv->cdr = ci->cdr;
+
+ SET_NETDEV_DEV(dev, &pdev->dev);
+
+ /* 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 0x%p, irq %d "
+ "registered as %s\n", i + 1, priv->reg_base,
+ dev->irq, dev->name);
+ } else {
+ dev_err(&pdev->dev, "Channel #%d not detected\n",
+ i + 1);
+ free_sja1000dev(dev);
+ }
+ }
+
+ if (!card->channels) {
+ err = -ENODEV;
+ goto failure_cleanup;
+ }
+
+ /*
+ * Enable interrupts from PCI-card (PLX90xx) and enable Local_1,
+ * Local_2 interrupts from the SJA1000 chips
+ */
+ val = ioread32(card->conf_addr + PLX_INTCSR);
+ val |= PLX_LINT1_EN | PLX_LINT2_EN | PLX_PCI_INT_EN;
+ iowrite32(val, card->conf_addr + PLX_INTCSR);
+
+ return 0;
+
+failure_cleanup:
+ dev_err(&pdev->dev, "Error: %d. Cleaning Up.\n", err);
+
+ plx_pci_del_card(pdev);
+
+ return err;
+}
+
+static struct pci_driver plx_pci_driver = {
+ .name = DRV_NAME,
+ .id_table = plx_pci_tbl,
+ .probe = plx_pci_add_card,
+ .remove = plx_pci_del_card,
+};
+
+static int __init plx_pci_init(void)
+{
+ return pci_register_driver(&plx_pci_driver);
+}
+
+static void __exit plx_pci_exit(void)
+{
+ pci_unregister_driver(&plx_pci_driver);
+}
+
+module_init(plx_pci_init);
+module_exit(plx_pci_exit);
projects / linux-2.6-microblaze.git / commitdiff