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Subject[PATCH v2 5/7] [PATCH 5/8] 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>
---
drivers/net/can/Kconfig | 10 +
drivers/net/can/sja1000/Makefile | 1
drivers/net/can/sja1000/sja1000_platform.c | 169 +++++++++++++++++++++++++++++
include/linux/can/platform/sja1000.h | 32 +++++
4 files changed, 212 insertions(+)
create mode 100644 drivers/net/can/sja1000/sja1000_platform.c
create mode 100644 include/linux/can/platform/sja1000.h

Index: net-next-2.6/drivers/net/can/Kconfig
===================================================================
--- net-next-2.6.orig/drivers/net/can/Kconfig 2009-05-12 10:47:25.747720647 +0200
+++ net-next-2.6/drivers/net/can/Kconfig 2009-05-12 10:47:26.411720627 +0200
@@ -41,6 +41,16 @@
---help---
Driver for the SJA1000 CAN controllers from Philips or NXP

+config CAN_SJA1000_PLATFORM
+ depends on CAN_SJA1000
+ tristate "Generic Platform Bus based SJA1000 driver"
+ ---help---
+ This driver adds support for the SJA1000 chips connected to
+ the "platform bus" (Linux abstraction for directly to the
+ processor attached devices). Which can be found on various
+ boards from Phytec (http://www.phytec.de) like the PCM027,
+ PCM038.
+
config CAN_DEBUG_DEVICES
bool "CAN devices debugging messages"
depends on CAN
Index: net-next-2.6/drivers/net/can/sja1000/Makefile
===================================================================
--- net-next-2.6.orig/drivers/net/can/sja1000/Makefile 2009-05-12 10:47:25.753720385 +0200
+++ net-next-2.6/drivers/net/can/sja1000/Makefile 2009-05-12 10:47:26.412720490 +0200
@@ -3,5 +3,6 @@
#

obj-$(CONFIG_CAN_SJA1000) += sja1000.o
+obj-$(CONFIG_CAN_SJA1000_PLATFORM) += sja1000_platform.o

ccflags-$(CONFIG_CAN_DEBUG_DEVICES) := -DDEBUG
Index: net-next-2.6/drivers/net/can/sja1000/sja1000_platform.c
===================================================================
--- /dev/null 1970-01-01 00:00:00.000000000 +0000
+++ net-next-2.6/drivers/net/can/sja1000/sja1000_platform.c 2009-05-12 10:47:26.416720502 +0200
@@ -0,0 +1,169 @@
+/*
+ * Copyright (C) 2005 Sascha Hauer, Pengutronix
+ * Copyright (C) 2007 Wolfgang Grandegger <wg@grandegger.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/platform_device.h>
+#include <linux/irq.h>
+#include <linux/can.h>
+#include <linux/can/dev.h>
+#include <linux/can/platform/sja1000.h>
+#include <linux/io.h>
+
+#include "sja1000.h"
+
+#define DRV_NAME "sja1000_platform"
+
+MODULE_AUTHOR("Sascha Hauer <s.hauer@pengutronix.de>");
+MODULE_DESCRIPTION("Socket-CAN driver for SJA1000 on the platform bus");
+MODULE_LICENSE("GPL v2");
+
+static u8 sp_read_reg(const struct net_device *dev, int reg)
+{
+ return ioread8((void __iomem *)(dev->base_addr + reg));
+}
+
+static void sp_write_reg(const struct net_device *dev, int reg, u8 val)
+{
+ iowrite8(val, (void __iomem *)(dev->base_addr + reg));
+}
+
+static int sp_probe(struct platform_device *pdev)
+{
+ int err, irq;
+ void __iomem *addr;
+ struct net_device *dev;
+ struct sja1000_priv *priv;
+ struct resource *res_mem, *res_irq;
+ struct sja1000_platform_data *pdata;
+
+ pdata = pdev->dev.platform_data;
+ if (!pdata) {
+ dev_err(&pdev->dev, "No platform data provided!\n");
+ err = -ENODEV;
+ goto exit;
+ }
+
+ res_mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+ res_irq = platform_get_resource(pdev, IORESOURCE_IRQ, 0);
+ if (!res_mem || !res_irq) {
+ err = -ENODEV;
+ goto exit;
+ }
+
+ if (!request_mem_region(res_mem->start,
+ res_mem->end - res_mem->start + 1,
+ DRV_NAME)) {
+ err = -EBUSY;
+ goto exit;
+ }
+
+ addr = ioremap_nocache(res_mem->start,
+ res_mem->end - res_mem->start + 1);
+ if (!addr) {
+ err = -ENOMEM;
+ goto exit_release;
+ }
+
+ irq = res_irq->start;
+ if (res_irq->flags & IRQF_TRIGGER_MASK)
+ set_irq_type(irq, res_irq->flags & IRQF_TRIGGER_MASK);
+
+ dev = alloc_sja1000dev(0);
+ if (!dev) {
+ err = -ENOMEM;
+ goto exit_iounmap;
+ }
+ priv = netdev_priv(dev);
+
+ priv->read_reg = sp_read_reg;
+ priv->write_reg = sp_write_reg;
+ priv->can.clock.freq = pdata->clock;
+ priv->ocr = pdata->ocr;
+ priv->cdr = pdata->cdr;
+
+ dev->irq = irq;
+ dev->base_addr = (unsigned long)addr;
+
+ dev_set_drvdata(&pdev->dev, dev);
+ SET_NETDEV_DEV(dev, &pdev->dev);
+
+ err = register_sja1000dev(dev);
+ if (err) {
+ dev_err(&pdev->dev, "registering %s failed (err=%d)\n",
+ DRV_NAME, err);
+ goto exit_free;
+ }
+
+ dev_info(&pdev->dev, "%s device registered (base_addr=%#lx, irq=%d)\n",
+ DRV_NAME, dev->base_addr, dev->irq);
+ return 0;
+
+ exit_free:
+ free_sja1000dev(dev);
+ exit_iounmap:
+ iounmap(addr);
+ exit_release:
+ release_mem_region(res_mem->start, res_mem->end - res_mem->start + 1);
+ exit:
+ return err;
+}
+
+static int sp_remove(struct platform_device *pdev)
+{
+ struct net_device *dev = dev_get_drvdata(&pdev->dev);
+ struct resource *res;
+
+ unregister_sja1000dev(dev);
+ dev_set_drvdata(&pdev->dev, NULL);
+ res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+ release_mem_region(res->start, res->end - res->start + 1);
+
+ if (dev->base_addr)
+ iounmap((void __iomem *)dev->base_addr);
+
+ free_sja1000dev(dev);
+
+ return 0;
+}
+
+static struct platform_driver sp_driver = {
+ .probe = sp_probe,
+ .remove = sp_remove,
+ .driver = {
+ .name = DRV_NAME,
+ .owner = THIS_MODULE,
+ },
+};
+
+static int __init sp_init(void)
+{
+ return platform_driver_register(&sp_driver);
+}
+
+static void __exit sp_exit(void)
+{
+ platform_driver_unregister(&sp_driver);
+}
+
+module_init(sp_init);
+module_exit(sp_exit);
Index: net-next-2.6/include/linux/can/platform/sja1000.h
===================================================================
--- /dev/null 1970-01-01 00:00:00.000000000 +0000
+++ net-next-2.6/include/linux/can/platform/sja1000.h 2009-05-12 10:47:26.419720650 +0200
@@ -0,0 +1,32 @@
+#ifndef _CAN_PLATFORM_SJA1000_H_
+#define _CAN_PLATFORM_SJA1000_H_
+
+/* clock divider register */
+#define CDR_CLKOUT_MASK 0x07
+#define CDR_CLK_OFF 0x08 /* Clock off (CLKOUT pin) */
+#define CDR_RXINPEN 0x20 /* TX1 output is RX irq output */
+#define CDR_CBP 0x40 /* CAN input comparator bypass */
+#define CDR_PELICAN 0x80 /* PeliCAN mode */
+
+/* output control register */
+#define OCR_MODE_BIPHASE 0x00
+#define OCR_MODE_TEST 0x01
+#define OCR_MODE_NORMAL 0x02
+#define OCR_MODE_CLOCK 0x03
+#define OCR_TX0_INVERT 0x04
+#define OCR_TX0_PULLDOWN 0x08
+#define OCR_TX0_PULLUP 0x10
+#define OCR_TX0_PUSHPULL 0x18
+#define OCR_TX1_INVERT 0x20
+#define OCR_TX1_PULLDOWN 0x40
+#define OCR_TX1_PULLUP 0x80
+#define OCR_TX1_PUSHPULL 0xc0
+
+struct sja1000_platform_data {
+ u32 clock; /* CAN bus oscillator frequency in Hz */
+
+ u8 ocr; /* output control register */
+ u8 cdr; /* clock divider register */
+};
+
+#endif /* !_CAN_PLATFORM_SJA1000_H_ */


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