dirty fix to merging

1 files changed, 223 insertions, 0 deletions

diff --git a/drivers/net/can/sja1000/sja1000_of_platform.c b/drivers/net/can/sja1000/sja1000_of_platform.c
new file mode 100644
index 00000000..f2683eb6
--- /dev/null
+++ b/drivers/net/can/sja1000/sja1000_of_platform.c
@@ -0,0 +1,223 @@
+/*
+ * Driver for SJA1000 CAN controllers on the OpenFirmware platform bus
+ *
+ * Copyright (C) 2008-2009 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.
+ */
+
+/* This is a generic driver for SJA1000 chips on the OpenFirmware platform
+ * bus found on embedded PowerPC systems. You need a SJA1000 CAN node
+ * definition in your flattened device tree source (DTS) file similar to:
+ *
+ *   can@3,100 {
+ *           compatible = "nxp,sja1000";
+ *           reg = <3 0x100 0x80>;
+ *           interrupts = <2 0>;
+ *           interrupt-parent = <&mpic>;
+ *           nxp,external-clock-frequency = <16000000>;
+ *   };
+ *
+ * See "Documentation/devicetree/bindings/net/can/sja1000.txt" for further
+ * information.
+ */
+
+#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 <linux/can/dev.h>
+
+#include <linux/of_platform.h>
+#include <asm/prom.h>
+
+#include "sja1000.h"
+
+#define DRV_NAME "sja1000_of_platform"
+
+MODULE_AUTHOR("Wolfgang Grandegger <wg@grandegger.com>");
+MODULE_DESCRIPTION("Socket-CAN driver for SJA1000 on the OF platform bus");
+MODULE_LICENSE("GPL v2");
+
+#define SJA1000_OFP_CAN_CLOCK  (16000000 / 2)
+
+#define SJA1000_OFP_OCR        OCR_TX0_PULLDOWN
+#define SJA1000_OFP_CDR        (CDR_CBP | CDR_CLK_OFF)
+
+static u8 sja1000_ofp_read_reg(const struct sja1000_priv *priv, int reg)
+{
+	return in_8(priv->reg_base + reg);
+}
+
+static void sja1000_ofp_write_reg(const struct sja1000_priv *priv,
+				  int reg, u8 val)
+{
+	out_8(priv->reg_base + reg, val);
+}
+
+static int __devexit sja1000_ofp_remove(struct platform_device *ofdev)
+{
+	struct net_device *dev = dev_get_drvdata(&ofdev->dev);
+	struct sja1000_priv *priv = netdev_priv(dev);
+	struct device_node *np = ofdev->dev.of_node;
+	struct resource res;
+
+	dev_set_drvdata(&ofdev->dev, NULL);
+
+	unregister_sja1000dev(dev);
+	free_sja1000dev(dev);
+	iounmap(priv->reg_base);
+	irq_dispose_mapping(dev->irq);
+
+	of_address_to_resource(np, 0, &res);
+	release_mem_region(res.start, resource_size(&res));
+
+	return 0;
+}
+
+static int __devinit sja1000_ofp_probe(struct platform_device *ofdev)
+{
+	struct device_node *np = ofdev->dev.of_node;
+	struct net_device *dev;
+	struct sja1000_priv *priv;
+	struct resource res;
+	const u32 *prop;
+	int err, irq, res_size, prop_size;
+	void __iomem *base;
+
+	err = of_address_to_resource(np, 0, &res);
+	if (err) {
+		dev_err(&ofdev->dev, "invalid address\n");
+		return err;
+	}
+
+	res_size = resource_size(&res);
+
+	if (!request_mem_region(res.start, res_size, DRV_NAME)) {
+		dev_err(&ofdev->dev, "couldn't request %pR\n", &res);
+		return -EBUSY;
+	}
+
+	base = ioremap_nocache(res.start, res_size);
+	if (!base) {
+		dev_err(&ofdev->dev, "couldn't ioremap %pR\n", &res);
+		err = -ENOMEM;
+		goto exit_release_mem;
+	}
+
+	irq = irq_of_parse_and_map(np, 0);
+	if (irq == NO_IRQ) {
+		dev_err(&ofdev->dev, "no irq found\n");
+		err = -ENODEV;
+		goto exit_unmap_mem;
+	}
+
+	dev = alloc_sja1000dev(0);
+	if (!dev) {
+		err = -ENOMEM;
+		goto exit_dispose_irq;
+	}
+
+	priv = netdev_priv(dev);
+
+	priv->read_reg = sja1000_ofp_read_reg;
+	priv->write_reg = sja1000_ofp_write_reg;
+
+	prop = of_get_property(np, "nxp,external-clock-frequency", &prop_size);
+	if (prop && (prop_size ==  sizeof(u32)))
+		priv->can.clock.freq = *prop / 2;
+	else
+		priv->can.clock.freq = SJA1000_OFP_CAN_CLOCK; /* default */
+
+	prop = of_get_property(np, "nxp,tx-output-mode", &prop_size);
+	if (prop && (prop_size == sizeof(u32)))
+		priv->ocr |= *prop & OCR_MODE_MASK;
+	else
+		priv->ocr |= OCR_MODE_NORMAL; /* default */
+
+	prop = of_get_property(np, "nxp,tx-output-config", &prop_size);
+	if (prop && (prop_size == sizeof(u32)))
+		priv->ocr |= (*prop << OCR_TX_SHIFT) & OCR_TX_MASK;
+	else
+		priv->ocr |= OCR_TX0_PULLDOWN; /* default */
+
+	prop = of_get_property(np, "nxp,clock-out-frequency", &prop_size);
+	if (prop && (prop_size == sizeof(u32)) && *prop) {
+		u32 divider = priv->can.clock.freq * 2 / *prop;
+
+		if (divider > 1)
+			priv->cdr |= divider / 2 - 1;
+		else
+			priv->cdr |= CDR_CLKOUT_MASK;
+	} else {
+		priv->cdr |= CDR_CLK_OFF; /* default */
+	}
+
+	prop = of_get_property(np, "nxp,no-comparator-bypass", NULL);
+	if (!prop)
+		priv->cdr |= CDR_CBP; /* default */
+
+	priv->irq_flags = IRQF_SHARED;
+	priv->reg_base = base;
+
+	dev->irq = irq;
+
+	dev_info(&ofdev->dev,
+		 "reg_base=0x%p irq=%d clock=%d ocr=0x%02x cdr=0x%02x\n",
+		 priv->reg_base, dev->irq, priv->can.clock.freq,
+		 priv->ocr, priv->cdr);
+
+	dev_set_drvdata(&ofdev->dev, dev);
+	SET_NETDEV_DEV(dev, &ofdev->dev);
+
+	err = register_sja1000dev(dev);
+	if (err) {
+		dev_err(&ofdev->dev, "registering %s failed (err=%d)\n",
+			DRV_NAME, err);
+		goto exit_free_sja1000;
+	}
+
+	return 0;
+
+exit_free_sja1000:
+	free_sja1000dev(dev);
+exit_dispose_irq:
+	irq_dispose_mapping(irq);
+exit_unmap_mem:
+	iounmap(base);
+exit_release_mem:
+	release_mem_region(res.start, res_size);
+
+	return err;
+}
+
+static struct of_device_id __devinitdata sja1000_ofp_table[] = {
+	{.compatible = "nxp,sja1000"},
+	{},
+};
+MODULE_DEVICE_TABLE(of, sja1000_ofp_table);
+
+static struct platform_driver sja1000_ofp_driver = {
+	.driver = {
+		.owner = THIS_MODULE,
+		.name = DRV_NAME,
+		.of_match_table = sja1000_ofp_table,
+	},
+	.probe = sja1000_ofp_probe,
+	.remove = __devexit_p(sja1000_ofp_remove),
+};
+
+module_platform_driver(sja1000_ofp_driver);