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>

3 files changed, 175 insertions, 0 deletions

diff --git a/drivers/net/can/Kconfig b/drivers/net/can/Kconfig
index c7e5ce339ead..8fe79741d3ca 100644
--- a/drivers/net/can/Kconfig
+++ b/drivers/net/can/Kconfig
@@ -41,6 +41,16 @@ config CAN_SJA1000
         ---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
diff --git a/drivers/net/can/sja1000/Makefile b/drivers/net/can/sja1000/Makefile
index 893ab2cfe244..5115cc90ab51 100644
--- a/drivers/net/can/sja1000/Makefile
+++ b/drivers/net/can/sja1000/Makefile
@@ -3,5 +3,6 @@
 #
 
 obj-$(CONFIG_CAN_SJA1000) += sja1000.o
+obj-$(CONFIG_CAN_SJA1000_PLATFORM) += sja1000_platform.o
 
 ccflags-$(CONFIG_CAN_DEBUG_DEVICES) := -DDEBUG
diff --git a/drivers/net/can/sja1000/sja1000_platform.c b/drivers/net/can/sja1000/sja1000_platform.c
new file mode 100644
index 000000000000..8017229d6fd6
--- /dev/null
+++ b/drivers/net/can/sja1000/sja1000_platform.c
@@ -0,0 +1,164 @@
+/*
+ * 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;
+        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, resource_size(res_mem),
+                                DRV_NAME)) {
+                err = -EBUSY;
+                goto exit;
+        }
+
+        addr = ioremap_nocache(res_mem->start, resource_size(res_mem));
+        if (!addr) {
+                err = -ENOMEM;
+                goto exit_release;
+        }
+
+        dev = alloc_sja1000dev(0);
+        if (!dev) {
+                err = -ENOMEM;
+                goto exit_iounmap;
+        }
+        priv = netdev_priv(dev);
+
+        dev->base_addr = (unsigned long)addr;
+        dev->irq = res_irq->start;
+        priv->irq_flags = res_irq->flags & IRQF_TRIGGER_MASK;
+        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_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, resource_size(res_mem));
+ 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);
+
+        if (dev->base_addr)
+                iounmap((void __iomem *)dev->base_addr);
+
+        res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+        release_mem_region(res->start, resource_size(res));
+
+        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);