can: SJA1000 generic platform bus driver
This driver adds support for the SJA1000 chips connected to the "platform bus", which can be found on various embedded systems. Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de> Signed-off-by: Wolfgang Grandegger <wg@grandegger.com> Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de> Signed-off-by: Oliver Hartkopp <oliver.hartkopp@volkswagen.de> Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Wolfgang Grandegger
David S. Miller
parent
429da1cc84
commit
f534e52f09
4 changed files with 207 additions and 0 deletions
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@ -41,6 +41,16 @@ config CAN_SJA1000
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---help---
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Driver for the SJA1000 CAN controllers from Philips or NXP
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config CAN_SJA1000_PLATFORM
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depends on CAN_SJA1000
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tristate "Generic Platform Bus based SJA1000 driver"
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---help---
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This driver adds support for the SJA1000 chips connected to
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the "platform bus" (Linux abstraction for directly to the
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processor attached devices). Which can be found on various
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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_DEBUG_DEVICES
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bool "CAN devices debugging messages"
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depends on CAN
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@ -3,5 +3,6 @@
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#
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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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ccflags-$(CONFIG_CAN_DEBUG_DEVICES) := -DDEBUG
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164
drivers/net/can/sja1000/sja1000_platform.c
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164
drivers/net/can/sja1000/sja1000_platform.c
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@ -0,0 +1,164 @@
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/*
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* Copyright (C) 2005 Sascha Hauer, Pengutronix
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* Copyright (C) 2007 Wolfgang Grandegger <wg@grandegger.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
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* Foundation, 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/platform_device.h>
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#include <linux/irq.h>
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#include <linux/can.h>
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#include <linux/can/dev.h>
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#include <linux/can/platform/sja1000.h>
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#include <linux/io.h>
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#include "sja1000.h"
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#define DRV_NAME "sja1000_platform"
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MODULE_AUTHOR("Sascha Hauer <s.hauer@pengutronix.de>");
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MODULE_DESCRIPTION("Socket-CAN driver for SJA1000 on the platform bus");
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MODULE_LICENSE("GPL v2");
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static u8 sp_read_reg(const struct net_device *dev, int reg)
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{
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return ioread8((void __iomem *)(dev->base_addr + reg));
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}
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static void sp_write_reg(const struct net_device *dev, int reg, u8 val)
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{
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iowrite8(val, (void __iomem *)(dev->base_addr + reg));
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}
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static int sp_probe(struct platform_device *pdev)
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{
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int err;
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void __iomem *addr;
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struct net_device *dev;
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struct sja1000_priv *priv;
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struct resource *res_mem, *res_irq;
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struct sja1000_platform_data *pdata;
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pdata = pdev->dev.platform_data;
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if (!pdata) {
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dev_err(&pdev->dev, "No platform data provided!\n");
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err = -ENODEV;
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goto exit;
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}
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res_mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
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res_irq = platform_get_resource(pdev, IORESOURCE_IRQ, 0);
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if (!res_mem || !res_irq) {
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err = -ENODEV;
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goto exit;
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}
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if (!request_mem_region(res_mem->start, resource_size(res_mem),
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DRV_NAME)) {
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err = -EBUSY;
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goto exit;
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}
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addr = ioremap_nocache(res_mem->start, resource_size(res_mem));
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if (!addr) {
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err = -ENOMEM;
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goto exit_release;
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}
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dev = alloc_sja1000dev(0);
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if (!dev) {
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err = -ENOMEM;
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goto exit_iounmap;
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}
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priv = netdev_priv(dev);
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dev->base_addr = (unsigned long)addr;
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dev->irq = res_irq->start;
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priv->irq_flags = res_irq->flags & IRQF_TRIGGER_MASK;
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priv->read_reg = sp_read_reg;
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priv->write_reg = sp_write_reg;
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priv->can.clock.freq = pdata->clock;
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priv->ocr = pdata->ocr;
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priv->cdr = pdata->cdr;
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dev_set_drvdata(&pdev->dev, dev);
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SET_NETDEV_DEV(dev, &pdev->dev);
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err = register_sja1000dev(dev);
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if (err) {
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dev_err(&pdev->dev, "registering %s failed (err=%d)\n",
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DRV_NAME, err);
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goto exit_free;
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}
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dev_info(&pdev->dev, "%s device registered (base_addr=%#lx, irq=%d)\n",
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DRV_NAME, dev->base_addr, dev->irq);
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return 0;
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exit_free:
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free_sja1000dev(dev);
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exit_iounmap:
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iounmap(addr);
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exit_release:
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release_mem_region(res_mem->start, resource_size(res_mem));
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exit:
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return err;
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}
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static int sp_remove(struct platform_device *pdev)
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{
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struct net_device *dev = dev_get_drvdata(&pdev->dev);
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struct resource *res;
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unregister_sja1000dev(dev);
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dev_set_drvdata(&pdev->dev, NULL);
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if (dev->base_addr)
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iounmap((void __iomem *)dev->base_addr);
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res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
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release_mem_region(res->start, resource_size(res));
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free_sja1000dev(dev);
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return 0;
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}
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static struct platform_driver sp_driver = {
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.probe = sp_probe,
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.remove = sp_remove,
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.driver = {
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.name = DRV_NAME,
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.owner = THIS_MODULE,
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},
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};
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static int __init sp_init(void)
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{
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return platform_driver_register(&sp_driver);
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}
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static void __exit sp_exit(void)
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{
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platform_driver_unregister(&sp_driver);
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}
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module_init(sp_init);
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module_exit(sp_exit);
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32
include/linux/can/platform/sja1000.h
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32
include/linux/can/platform/sja1000.h
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@ -0,0 +1,32 @@
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#ifndef _CAN_PLATFORM_SJA1000_H_
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#define _CAN_PLATFORM_SJA1000_H_
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/* clock divider register */
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#define CDR_CLKOUT_MASK 0x07
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#define CDR_CLK_OFF 0x08 /* Clock off (CLKOUT pin) */
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#define CDR_RXINPEN 0x20 /* TX1 output is RX irq output */
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#define CDR_CBP 0x40 /* CAN input comparator bypass */
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#define CDR_PELICAN 0x80 /* PeliCAN mode */
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/* output control register */
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#define OCR_MODE_BIPHASE 0x00
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#define OCR_MODE_TEST 0x01
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#define OCR_MODE_NORMAL 0x02
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#define OCR_MODE_CLOCK 0x03
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#define OCR_TX0_INVERT 0x04
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#define OCR_TX0_PULLDOWN 0x08
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#define OCR_TX0_PULLUP 0x10
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#define OCR_TX0_PUSHPULL 0x18
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#define OCR_TX1_INVERT 0x20
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#define OCR_TX1_PULLDOWN 0x40
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#define OCR_TX1_PULLUP 0x80
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#define OCR_TX1_PUSHPULL 0xc0
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struct sja1000_platform_data {
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u32 clock; /* CAN bus oscillator frequency in Hz */
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u8 ocr; /* output control register */
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u8 cdr; /* clock divider register */
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};
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#endif /* !_CAN_PLATFORM_SJA1000_H_ */
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