can: SJA1000 driver for EMS PCI cards (a61a8423) · Commits · e / devices / android_kernel_fairphone_FP4

drivers/net/can/Kconfig

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		@@ -51,6 +51,13 @@ 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

drivers/net/can/sja1000/Makefile

+1 −0

Original line number	Diff line number	Diff line
		@@ -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

drivers/net/can/sja1000/ems_pci.c

0 → 100644

+329 −0

Original line number	Diff line number	Diff line
		/*
		* 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);