can/sja1000: add driver for EMS PCMCIA card (fd734c6f) · Commits · e / devices / android_kernel_samsung_universal8895

drivers/net/can/sja1000/Kconfig

+7 −0

Original line number	Diff line number	Diff line
		@@ -29,6 +29,13 @@ config CAN_SJA1000_OF_PLATFORM
		OpenFirmware bindings, e.g. if you have a PowerPC based system
		you may want to enable this option.

		config CAN_EMS_PCMCIA
		tristate "EMS CPC-CARD Card"
		depends on PCMCIA
		---help---
		This driver is for the one or two channel CPC-CARD cards from
		EMS Dr. Thomas Wuensche (http://www.ems-wuensche.de).

		config CAN_EMS_PCI
		tristate "EMS CPC-PCI, CPC-PCIe and CPC-104P Card"
		depends on PCI

drivers/net/can/sja1000/Makefile

+1 −0

Original line number	Diff line number	Diff line
		@@ -6,6 +6,7 @@ obj-$(CONFIG_CAN_SJA1000) += sja1000.o
		obj-$(CONFIG_CAN_SJA1000_ISA) += sja1000_isa.o
		obj-$(CONFIG_CAN_SJA1000_PLATFORM) += sja1000_platform.o
		obj-$(CONFIG_CAN_SJA1000_OF_PLATFORM) += sja1000_of_platform.o
		obj-$(CONFIG_CAN_EMS_PCMCIA) += ems_pcmcia.o
		obj-$(CONFIG_CAN_EMS_PCI) += ems_pci.o
		obj-$(CONFIG_CAN_KVASER_PCI) += kvaser_pci.o
		obj-$(CONFIG_CAN_PEAK_PCI) += peak_pci.o

drivers/net/can/sja1000/ems_pcmcia.c

0 → 100644

+331 −0

Original line number	Diff line number	Diff line
		/*
		* Copyright (C) 2008 Sebastian Haas (initial chardev implementation)
		* Copyright (C) 2010 Markus Plessing <plessing@ems-wuensche.com>
		* Rework for mainline by Oliver Hartkopp <socketcan@hartkopp.net>
		*
		* 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.
		*/

		#include <linux/kernel.h>
		#include <linux/module.h>
		#include <linux/interrupt.h>
		#include <linux/netdevice.h>
		#include <linux/delay.h>
		#include <linux/io.h>
		#include <pcmcia/cistpl.h>
		#include <pcmcia/ds.h>
		#include <linux/can.h>
		#include <linux/can/dev.h>
		#include "sja1000.h"

		#define DRV_NAME "ems_pcmcia"

		MODULE_AUTHOR("Markus Plessing <plessing@ems-wuensche.com>");
		MODULE_DESCRIPTION("Socket-CAN driver for EMS CPC-CARD cards");
		MODULE_SUPPORTED_DEVICE("EMS CPC-CARD CAN card");
		MODULE_LICENSE("GPL v2");

		#define EMS_PCMCIA_MAX_CHAN 2

		struct ems_pcmcia_card {
		int channels;
		struct pcmcia_device *pcmcia_dev;
		struct net_device *net_dev[EMS_PCMCIA_MAX_CHAN];
		void __iomem *base_addr;
		};

		#define EMS_PCMCIA_CAN_CLOCK (16000000 / 2)

		/*
		* 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_PCMCIA_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_PCMCIA_CDR (CDR_CBP \| CDR_CLKOUT_MASK)
		#define EMS_PCMCIA_MEM_SIZE 4096 /* Size of the remapped io-memory */
		#define EMS_PCMCIA_CAN_BASE_OFFSET 0x100 /* Offset where controllers starts */
		#define EMS_PCMCIA_CAN_CTRL_SIZE 0x80 /* Memory size for each controller */

		#define EMS_CMD_RESET 0x00 /* Perform a reset of the card */
		#define EMS_CMD_MAP 0x03 /* Map CAN controllers into card' memory */
		#define EMS_CMD_UMAP 0x02 /* Unmap CAN controllers from card' memory */

		static struct pcmcia_device_id ems_pcmcia_tbl[] = {
		PCMCIA_DEVICE_PROD_ID123("EMS_T_W", "CPC-Card", "V2.0", 0xeab1ea23,
		0xa338573f, 0xe4575800),
		PCMCIA_DEVICE_NULL,
		};

		MODULE_DEVICE_TABLE(pcmcia, ems_pcmcia_tbl);

		static u8 ems_pcmcia_read_reg(const struct sja1000_priv *priv, int port)
		{
		return readb(priv->reg_base + port);
		}

		static void ems_pcmcia_write_reg(const struct sja1000_priv *priv, int port,
		u8 val)
		{
		writeb(val, priv->reg_base + port);
		}

		static irqreturn_t ems_pcmcia_interrupt(int irq, void *dev_id)
		{
		struct ems_pcmcia_card *card = dev_id;
		struct net_device *dev;
		irqreturn_t retval = IRQ_NONE;
		int i, again;

		/* Card not present */
		if (readw(card->base_addr) != 0xAA55)
		return IRQ_HANDLED;

		do {
		again = 0;

		/* Check interrupt for each channel */
		for (i = 0; i < card->channels; i++) {
		dev = card->net_dev[i];
		if (!dev)
		continue;

		if (sja1000_interrupt(irq, dev) == IRQ_HANDLED)
		again = 1;
		}
		/* At least one channel handled the interrupt */
		if (again)
		retval = IRQ_HANDLED;

		} while (again);

		return retval;
		}

		/*
		* Check if a CAN controller is present at the specified location
		* by trying to set 'em into the PeliCAN mode
		*/
		static inline int ems_pcmcia_check_chan(struct sja1000_priv *priv)
		{
		/* Make sure SJA1000 is in reset mode */
		ems_pcmcia_write_reg(priv, REG_MOD, 1);
		ems_pcmcia_write_reg(priv, REG_CDR, CDR_PELICAN);

		/* read reset-values */
		if (ems_pcmcia_read_reg(priv, REG_CDR) == CDR_PELICAN)
		return 1;

		return 0;
		}

		static void ems_pcmcia_del_card(struct pcmcia_device *pdev)
		{
		struct ems_pcmcia_card *card = pdev->priv;
		struct net_device *dev;
		int i;

		free_irq(pdev->irq, card);

		for (i = 0; i < card->channels; i++) {
		dev = card->net_dev[i];
		if (!dev)
		continue;

		printk(KERN_INFO "%s: removing %s on channel #%d\n",
		DRV_NAME, dev->name, i);
		unregister_sja1000dev(dev);
		free_sja1000dev(dev);
		}

		writeb(EMS_CMD_UMAP, card->base_addr);
		iounmap(card->base_addr);
		kfree(card);

		pdev->priv = NULL;
		}

		/*
		* Probe PCI device for EMS CAN signature and register each available
		* CAN channel to SJA1000 Socket-CAN subsystem.
		*/
		static int __devinit ems_pcmcia_add_card(struct pcmcia_device *pdev,
		unsigned long base)
		{
		struct sja1000_priv *priv;
		struct net_device *dev;
		struct ems_pcmcia_card *card;
		int err, i;

		/* Allocating card structures to hold addresses, ... */
		card = kzalloc(sizeof(struct ems_pcmcia_card), GFP_KERNEL);
		if (!card)
		return -ENOMEM;

		pdev->priv = card;
		card->channels = 0;

		card->base_addr = ioremap(base, EMS_PCMCIA_MEM_SIZE);
		if (!card->base_addr) {
		err = -ENOMEM;
		goto failure_cleanup;
		}

		/* Check for unique EMS CAN signature */
		if (readw(card->base_addr) != 0xAA55) {
		err = -ENODEV;
		goto failure_cleanup;
		}

		/* Request board reset */
		writeb(EMS_CMD_RESET, card->base_addr);

		/* Make sure CAN controllers are mapped into card's memory space */
		writeb(EMS_CMD_MAP, card->base_addr);

		/* Detect available channels */
		for (i = 0; i < EMS_PCMCIA_MAX_CHAN; i++) {
		dev = alloc_sja1000dev(0);
		if (!dev) {
		err = -ENOMEM;
		goto failure_cleanup;
		}

		card->net_dev[i] = dev;
		priv = netdev_priv(dev);
		priv->priv = card;
		SET_NETDEV_DEV(dev, &pdev->dev);

		priv->irq_flags = IRQF_SHARED;
		dev->irq = pdev->irq;
		priv->reg_base = card->base_addr + EMS_PCMCIA_CAN_BASE_OFFSET +
		(i * EMS_PCMCIA_CAN_CTRL_SIZE);

		/* Check if channel is present */
		if (ems_pcmcia_check_chan(priv)) {
		priv->read_reg = ems_pcmcia_read_reg;
		priv->write_reg = ems_pcmcia_write_reg;
		priv->can.clock.freq = EMS_PCMCIA_CAN_CLOCK;
		priv->ocr = EMS_PCMCIA_OCR;
		priv->cdr = EMS_PCMCIA_CDR;
		priv->flags \|= SJA1000_CUSTOM_IRQ_HANDLER;

		/* Register SJA1000 device */
		err = register_sja1000dev(dev);
		if (err) {
		free_sja1000dev(dev);
		goto failure_cleanup;
		}

		card->channels++;

		printk(KERN_INFO "%s: registered %s on channel "
		"#%d at 0x%p, irq %d\n", DRV_NAME, dev->name,
		i, priv->reg_base, dev->irq);
		} else
		free_sja1000dev(dev);
		}

		err = request_irq(dev->irq, &ems_pcmcia_interrupt, IRQF_SHARED,
		DRV_NAME, card);
		if (!err)
		return 0;

		failure_cleanup:
		ems_pcmcia_del_card(pdev);
		return err;
		}

		/*
		* Setup PCMCIA socket and probe for EMS CPC-CARD
		*/
		static int __devinit ems_pcmcia_probe(struct pcmcia_device *dev)
		{
		int csval;

		/* General socket configuration */
		dev->config_flags \|= CONF_ENABLE_IRQ;
		dev->config_index = 1;
		dev->config_regs = PRESENT_OPTION;

		/* The io structure describes IO port mapping */
		dev->resource[0]->end = 16;
		dev->resource[0]->flags \|= IO_DATA_PATH_WIDTH_8;
		dev->resource[1]->end = 16;
		dev->resource[1]->flags \|= IO_DATA_PATH_WIDTH_16;
		dev->io_lines = 5;

		/* Allocate a memory window */
		dev->resource[2]->flags =
		(WIN_DATA_WIDTH_8 \| WIN_MEMORY_TYPE_CM \| WIN_ENABLE);
		dev->resource[2]->start = dev->resource[2]->end = 0;

		csval = pcmcia_request_window(dev, dev->resource[2], 0);
		if (csval) {
		dev_err(&dev->dev, "pcmcia_request_window failed (err=%d)\n",
		csval);
		return 0;
		}

		csval = pcmcia_map_mem_page(dev, dev->resource[2], dev->config_base);
		if (csval) {
		dev_err(&dev->dev, "pcmcia_map_mem_page failed (err=%d)\n",
		csval);
		return 0;
		}

		csval = pcmcia_enable_device(dev);
		if (csval) {
		dev_err(&dev->dev, "pcmcia_enable_device failed (err=%d)\n",
		csval);
		return 0;
		}

		ems_pcmcia_add_card(dev, dev->resource[2]->start);
		return 0;
		}

		/*
		* Release claimed resources
		*/
		static void ems_pcmcia_remove(struct pcmcia_device *dev)
		{
		ems_pcmcia_del_card(dev);
		pcmcia_disable_device(dev);
		}

		static struct pcmcia_driver ems_pcmcia_driver = {
		.name = DRV_NAME,
		.probe = ems_pcmcia_probe,
		.remove = ems_pcmcia_remove,
		.id_table = ems_pcmcia_tbl,
		};

		static int __init ems_pcmcia_init(void)
		{
		return pcmcia_register_driver(&ems_pcmcia_driver);
		}
		module_init(ems_pcmcia_init);

		static void __exit ems_pcmcia_exit(void)
		{
		pcmcia_unregister_driver(&ems_pcmcia_driver);
		}
		module_exit(ems_pcmcia_exit);