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Date: Fri, 29 Jan 2010 11:55:16 +0200
From: Daniel Baluta <daniel.baluta@...il.com>
To: "Pavel B. Cheblakov" <P.B.Cheblakov@....nsk.su>
Cc: netdev@...r.kernel.org, Socketcan-core@...ts.berlios.de
Subject: Re: [PATCH net-next-2.6] can: add support for CAN interface cards
based on the PLX90xx PCI bridge
On Fri, Jan 29, 2010 at 11:45 AM, Pavel B. Cheblakov
<P.B.Cheblakov@....nsk.su> wrote:
> From: Pavel Cheblakov <P.B.Cheblakov@....nsk.su>
>
> This driver is for CAN interface cards based on the PLX90xx PCI bridge.
> Driver supports now:
> - Adlink PCI-7841/cPCI-7841 card (http://www.adlinktech.com/)
> - Adlink PCI-7841/cPCI-7841 SE card
> - Marathon CAN-bus-PCI card (http://www.marathon.ru/)
> - TEWS TECHNOLOGIES TPMC810 card (http://www.tews.com/)
>
> Signed-off-by: Pavel Cheblakov <P.B.Cheblakov@....nsk.su>
> ---
> drivers/net/can/sja1000/Kconfig | 12 +
> drivers/net/can/sja1000/Makefile | 1 +
> drivers/net/can/sja1000/plx_pci.c | 457 +++++++++++++++++++++++++++++++++++++
> 3 files changed, 470 insertions(+), 0 deletions(-)
> create mode 100644 drivers/net/can/sja1000/plx_pci.c
>
> diff --git a/drivers/net/can/sja1000/Kconfig b/drivers/net/can/sja1000/Kconfig
> index 4c67492..9e277d6 100644
> --- a/drivers/net/can/sja1000/Kconfig
> +++ b/drivers/net/can/sja1000/Kconfig
> @@ -44,4 +44,16 @@ config CAN_KVASER_PCI
> This driver is for the the PCIcanx and PCIcan cards (1, 2 or
> 4 channel) from Kvaser (http://www.kvaser.com).
>
> +config CAN_PLX_PCI
> + tristate "PLX90xx PCI-bridge based Cards"
> + depends on PCI
> + ---help---
> + This driver is for CAN interface cards based on
> + the PLX90xx PCI bridge.
> + Driver supports now:
> + - Adlink PCI-7841/cPCI-7841 card (http://www.adlinktech.com/)
> + - Adlink PCI-7841/cPCI-7841 SE card
> + - Marathon CAN-bus-PCI card (http://www.marathon.ru/)
> + - TEWS TECHNOLOGIES TPMC810 card (http://www.tews.com/)
> +
> endif
> diff --git a/drivers/net/can/sja1000/Makefile b/drivers/net/can/sja1000/Makefile
> index 9d245ac..ce92455 100644
> --- a/drivers/net/can/sja1000/Makefile
> +++ b/drivers/net/can/sja1000/Makefile
> @@ -8,5 +8,6 @@ obj-$(CONFIG_CAN_SJA1000_PLATFORM) += sja1000_platform.o
> obj-$(CONFIG_CAN_SJA1000_OF_PLATFORM) += sja1000_of_platform.o
> obj-$(CONFIG_CAN_EMS_PCI) += ems_pci.o
> obj-$(CONFIG_CAN_KVASER_PCI) += kvaser_pci.o
> +obj-$(CONFIG_CAN_PLX_PCI) += plx_pci.o
>
> ccflags-$(CONFIG_CAN_DEBUG_DEVICES) := -DDEBUG
> diff --git a/drivers/net/can/sja1000/plx_pci.c b/drivers/net/can/sja1000/plx_pci.c
> new file mode 100644
> index 0000000..4b7a697
> --- /dev/null
> +++ b/drivers/net/can/sja1000/plx_pci.c
> @@ -0,0 +1,457 @@
> +/*
> + * Copyright (C) 2008-2010 Pavel Cheblakov <P.B.Cheblakov@....nsk.su>
> + *
> + * Derived from the ems_pci.c driver:
> + * Copyright (C) 2007 Wolfgang Grandegger <wg@...ndegger.com>
> + * Copyright (C) 2008 Markus Plessing <plessing@...-wuensche.com>
> + * Copyright (C) 2008 Sebastian Haas <haas@...-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@....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 /* Interrup Control/Status */
Small type: Interrup -> Interrupt
> +#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)
> +
> +#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 struct pci_device_id 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_MOD) & 0xa1) == 0x21 &&
> + (priv->read_reg(priv, REG_SR) == 0x0c) &&
> + (priv->read_reg(priv, REG_IR) == 0xe0))
> + 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) & 0xf1) == 0x01 &&
> + (priv->read_reg(priv, REG_SR) & 0x37) == 0x34 &&
> + (priv->read_reg(priv, REG_IR) & 0xfb) == 0x00)
> + return flag;
> +
> + return 0;
Perhaps some defines here will increase readability ?
> +}
> +
> +/*
> + * 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);
> --
> 1.6.0.6
>
> _______________________________________________
> Socketcan-core mailing list
> Socketcan-core@...ts.berlios.de
> https://lists.berlios.de/mailman/listinfo/socketcan-core
>
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