[deliverable/linux.git] / drivers / net / can / sja1000 / sja1000_of_platform.c

/*
 * 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/powerpc/dts-bindings/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/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),
};

static int __init sja1000_ofp_init(void)
{
	return platform_driver_register(&sja1000_ofp_driver);
}
module_init(sja1000_ofp_init);

static void __exit sja1000_ofp_exit(void)
{
	return platform_driver_unregister(&sja1000_ofp_driver);
};
module_exit(sja1000_ofp_exit);
Commit	Line	Data
d1a277c5 WG	1	/*
	2	* Driver for SJA1000 CAN controllers on the OpenFirmware platform bus
	3	*
	4	* Copyright (C) 2008-2009 Wolfgang Grandegger <wg@grandegger.com>
	5	*
	6	* This program is free software; you can redistribute it and/or modify
	7	* it under the terms of the version 2 of the GNU General Public License
	8	* as published by the Free Software Foundation
	9	*
	10	* This program is distributed in the hope that it will be useful,
	11	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	12	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	13	* GNU General Public License for more details.
	14	*
	15	* You should have received a copy of the GNU General Public License
	16	* along with this program; if not, write to the Free Software Foundation,
	17	* Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
	18	*/
	19
	20	/* This is a generic driver for SJA1000 chips on the OpenFirmware platform
	21	* bus found on embedded PowerPC systems. You need a SJA1000 CAN node
	22	* definition in your flattened device tree source (DTS) file similar to:
	23	*
	24	* can@3,100 {
	25	* compatible = "nxp,sja1000";
	26	* reg = <3 0x100 0x80>;
	27	* interrupts = <2 0>;
	28	* interrupt-parent = <&mpic>;
	29	* nxp,external-clock-frequency = <16000000>;
	30	* };
	31	*
	32	* See "Documentation/powerpc/dts-bindings/can/sja1000.txt" for further
	33	* information.
	34	*/
	35
	36	#include <linux/kernel.h>
	37	#include <linux/module.h>
	38	#include <linux/interrupt.h>
	39	#include <linux/netdevice.h>
	40	#include <linux/delay.h>
d1a277c5 WG	41	#include <linux/can/dev.h>
	42
	43	#include <linux/of_platform.h>
	44	#include <asm/prom.h>
	45
	46	#include "sja1000.h"
	47
	48	#define DRV_NAME "sja1000_of_platform"
	49
	50	MODULE_AUTHOR("Wolfgang Grandegger <wg@grandegger.com>");
	51	MODULE_DESCRIPTION("Socket-CAN driver for SJA1000 on the OF platform bus");
	52	MODULE_LICENSE("GPL v2");
	53
	54	#define SJA1000_OFP_CAN_CLOCK (16000000 / 2)
	55
	56	#define SJA1000_OFP_OCR OCR_TX0_PULLDOWN
	57	#define SJA1000_OFP_CDR (CDR_CBP \| CDR_CLK_OFF)
	58
	59	static u8 sja1000_ofp_read_reg(const struct sja1000_priv *priv, int reg)
	60	{
	61	return in_8(priv->reg_base + reg);
	62	}
	63
	64	static void sja1000_ofp_write_reg(const struct sja1000_priv *priv,
	65	int reg, u8 val)
	66	{
	67	out_8(priv->reg_base + reg, val);
	68	}
	69
2dc11581	70	static int __devexit sja1000_ofp_remove(struct platform_device *ofdev)
d1a277c5 WG	71	{
	72	struct net_device *dev = dev_get_drvdata(&ofdev->dev);
	73	struct sja1000_priv *priv = netdev_priv(dev);
61c7a080	74	struct device_node *np = ofdev->dev.of_node;
d1a277c5 WG	75	struct resource res;
	76
	77	dev_set_drvdata(&ofdev->dev, NULL);
	78
	79	unregister_sja1000dev(dev);
	80	free_sja1000dev(dev);
	81	iounmap(priv->reg_base);
	82	irq_dispose_mapping(dev->irq);
	83
	84	of_address_to_resource(np, 0, &res);
	85	release_mem_region(res.start, resource_size(&res));
	86
	87	return 0;
	88	}
	89
74888760	90	static int __devinit sja1000_ofp_probe(struct platform_device *ofdev)
d1a277c5	91	{
61c7a080	92	struct device_node *np = ofdev->dev.of_node;
d1a277c5 WG	93	struct net_device *dev;
	94	struct sja1000_priv *priv;
	95	struct resource res;
	96	const u32 *prop;
	97	int err, irq, res_size, prop_size;
	98	void __iomem *base;
	99
	100	err = of_address_to_resource(np, 0, &res);
	101	if (err) {
	102	dev_err(&ofdev->dev, "invalid address\n");
	103	return err;
	104	}
	105
	106	res_size = resource_size(&res);
	107
	108	if (!request_mem_region(res.start, res_size, DRV_NAME)) {
b1323c8f	109	dev_err(&ofdev->dev, "couldn't request %pR\n", &res);
d1a277c5 WG	110	return -EBUSY;
	111	}
	112
	113	base = ioremap_nocache(res.start, res_size);
	114	if (!base) {
b1323c8f	115	dev_err(&ofdev->dev, "couldn't ioremap %pR\n", &res);
d1a277c5 WG	116	err = -ENOMEM;
	117	goto exit_release_mem;
	118	}
	119
	120	irq = irq_of_parse_and_map(np, 0);
	121	if (irq == NO_IRQ) {
	122	dev_err(&ofdev->dev, "no irq found\n");
	123	err = -ENODEV;
	124	goto exit_unmap_mem;
	125	}
	126
	127	dev = alloc_sja1000dev(0);
	128	if (!dev) {
	129	err = -ENOMEM;
	130	goto exit_dispose_irq;
	131	}
	132
	133	priv = netdev_priv(dev);
	134
	135	priv->read_reg = sja1000_ofp_read_reg;
	136	priv->write_reg = sja1000_ofp_write_reg;
	137
	138	prop = of_get_property(np, "nxp,external-clock-frequency", &prop_size);
	139	if (prop && (prop_size == sizeof(u32)))
	140	priv->can.clock.freq = *prop / 2;
	141	else
	142	priv->can.clock.freq = SJA1000_OFP_CAN_CLOCK; /* default */
	143
	144	prop = of_get_property(np, "nxp,tx-output-mode", &prop_size);
	145	if (prop && (prop_size == sizeof(u32)))
	146	priv->ocr \|= *prop & OCR_MODE_MASK;
	147	else
	148	priv->ocr \|= OCR_MODE_NORMAL; /* default */
	149
	150	prop = of_get_property(np, "nxp,tx-output-config", &prop_size);
	151	if (prop && (prop_size == sizeof(u32)))
	152	priv->ocr \|= (*prop << OCR_TX_SHIFT) & OCR_TX_MASK;
	153	else
	154	priv->ocr \|= OCR_TX0_PULLDOWN; /* default */
	155
	156	prop = of_get_property(np, "nxp,clock-out-frequency", &prop_size);
	157	if (prop && (prop_size == sizeof(u32)) && *prop) {
	158	u32 divider = priv->can.clock.freq * 2 / *prop;
	159
	160	if (divider > 1)
	161	priv->cdr \|= divider / 2 - 1;
	162	else
	163	priv->cdr \|= CDR_CLKOUT_MASK;
	164	} else {
	165	priv->cdr \|= CDR_CLK_OFF; /* default */
	166	}
	167
	168	prop = of_get_property(np, "nxp,no-comparator-bypass", NULL);
	169	if (!prop)
	170	priv->cdr \|= CDR_CBP; /* default */
	171
	172	priv->irq_flags = IRQF_SHARED;
	173	priv->reg_base = base;
	174
	175	dev->irq = irq;
	176
	177	dev_info(&ofdev->dev,
	178	"reg_base=0x%p irq=%d clock=%d ocr=0x%02x cdr=0x%02x\n",
	179	priv->reg_base, dev->irq, priv->can.clock.freq,
180	priv->ocr, priv->cdr);
181
182	dev_set_drvdata(&ofdev->dev, dev);
183	SET_NETDEV_DEV(dev, &ofdev->dev);
184
185	err = register_sja1000dev(dev);
186	if (err) {
187	dev_err(&ofdev->dev, "registering %s failed (err=%d)\n",
188	DRV_NAME, err);
189	goto exit_free_sja1000;
190	}
191
192	return 0;
193
194	exit_free_sja1000:
195	free_sja1000dev(dev);
196	exit_dispose_irq:
197	irq_dispose_mapping(irq);
198	exit_unmap_mem:
199	iounmap(base);
200	exit_release_mem:
201	release_mem_region(res.start, res_size);
202
203	return err;
204	}
205
206	static struct of_device_id __devinitdata sja1000_ofp_table[] = {
207	{.compatible = "nxp,sja1000"},
208	{},
209	};
e72701ac	210	MODULE_DEVICE_TABLE(of, sja1000_ofp_table);
d1a277c5	211
74888760	212	static struct platform_driver sja1000_ofp_driver = {
4018294b GL	213	.driver = {
	214	.owner = THIS_MODULE,
	215	.name = DRV_NAME,
	216	.of_match_table = sja1000_ofp_table,
	217	},
d1a277c5 WG	218	.probe = sja1000_ofp_probe,
d1a277c5 WG	219	.remove = __devexit_p(sja1000_ofp_remove),
d1a277c5 WG	220	};
	221
	222	static int __init sja1000_ofp_init(void)
	223	{
74888760	224	return platform_driver_register(&sja1000_ofp_driver);
d1a277c5 WG	225	}
	226	module_init(sja1000_ofp_init);
	227
	228	static void __exit sja1000_ofp_exit(void)
	229	{
74888760	230	return platform_driver_unregister(&sja1000_ofp_driver);
d1a277c5 WG	231	};
d1a277c5 WG	232	module_exit(sja1000_ofp_exit);