[linux-2.6-block.git] / drivers / net / can / sja1000 / sja1000_platform.c

/*
 * 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, see <http://www.gnu.org/licenses/>.
 */

#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/dev.h>
#include <linux/can/platform/sja1000.h>
#include <linux/io.h>
#include <linux/of.h>
#include <linux/of_irq.h>

#include "sja1000.h"

#define DRV_NAME "sja1000_platform"
#define SP_CAN_CLOCK  (16000000 / 2)

MODULE_AUTHOR("Sascha Hauer <s.hauer@pengutronix.de>");
MODULE_AUTHOR("Wolfgang Grandegger <wg@grandegger.com>");
MODULE_DESCRIPTION("Socket-CAN driver for SJA1000 on the platform bus");
MODULE_ALIAS("platform:" DRV_NAME);
MODULE_LICENSE("GPL v2");

static u8 sp_read_reg8(const struct sja1000_priv *priv, int reg)
{
	return ioread8(priv->reg_base + reg);
}

static void sp_write_reg8(const struct sja1000_priv *priv, int reg, u8 val)
{
	iowrite8(val, priv->reg_base + reg);
}

static u8 sp_read_reg16(const struct sja1000_priv *priv, int reg)
{
	return ioread8(priv->reg_base + reg * 2);
}

static void sp_write_reg16(const struct sja1000_priv *priv, int reg, u8 val)
{
	iowrite8(val, priv->reg_base + reg * 2);
}

static u8 sp_read_reg32(const struct sja1000_priv *priv, int reg)
{
	return ioread8(priv->reg_base + reg * 4);
}

static void sp_write_reg32(const struct sja1000_priv *priv, int reg, u8 val)
{
	iowrite8(val, priv->reg_base + reg * 4);
}

static void sp_populate(struct sja1000_priv *priv,
			struct sja1000_platform_data *pdata,
			unsigned long resource_mem_flags)
{
	/* The CAN clock frequency is half the oscillator clock frequency */
	priv->can.clock.freq = pdata->osc_freq / 2;
	priv->ocr = pdata->ocr;
	priv->cdr = pdata->cdr;

	switch (resource_mem_flags & IORESOURCE_MEM_TYPE_MASK) {
	case IORESOURCE_MEM_32BIT:
		priv->read_reg = sp_read_reg32;
		priv->write_reg = sp_write_reg32;
		break;
	case IORESOURCE_MEM_16BIT:
		priv->read_reg = sp_read_reg16;
		priv->write_reg = sp_write_reg16;
		break;
	case IORESOURCE_MEM_8BIT:
	default:
		priv->read_reg = sp_read_reg8;
		priv->write_reg = sp_write_reg8;
		break;
	}
}

static void sp_populate_of(struct sja1000_priv *priv, struct device_node *of)
{
	int err;
	u32 prop;

	err = of_property_read_u32(of, "reg-io-width", &prop);
	if (err)
		prop = 1; /* 8 bit is default */

	switch (prop) {
	case 4:
		priv->read_reg = sp_read_reg32;
		priv->write_reg = sp_write_reg32;
		break;
	case 2:
		priv->read_reg = sp_read_reg16;
		priv->write_reg = sp_write_reg16;
		break;
	case 1:	/* fallthrough */
	default:
		priv->read_reg = sp_read_reg8;
		priv->write_reg = sp_write_reg8;
	}

	err = of_property_read_u32(of, "nxp,external-clock-frequency", &prop);
	if (!err)
		priv->can.clock.freq = prop / 2;
	else
		priv->can.clock.freq = SP_CAN_CLOCK; /* default */

	err = of_property_read_u32(of, "nxp,tx-output-mode", &prop);
	if (!err)
		priv->ocr |= prop & OCR_MODE_MASK;
	else
		priv->ocr |= OCR_MODE_NORMAL; /* default */

	err = of_property_read_u32(of, "nxp,tx-output-config", &prop);
	if (!err)
		priv->ocr |= (prop << OCR_TX_SHIFT) & OCR_TX_MASK;
	else
		priv->ocr |= OCR_TX0_PULLDOWN; /* default */

	err = of_property_read_u32(of, "nxp,clock-out-frequency", &prop);
	if (!err && 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 */
	}

	if (!of_property_read_bool(of, "nxp,no-comparator-bypass"))
		priv->cdr |= CDR_CBP; /* default */
}

static int sp_probe(struct platform_device *pdev)
{
	int err, irq = 0;
	void __iomem *addr;
	struct net_device *dev;
	struct sja1000_priv *priv;
	struct resource *res_mem, *res_irq = NULL;
	struct sja1000_platform_data *pdata;
	struct device_node *of = pdev->dev.of_node;

	pdata = dev_get_platdata(&pdev->dev);
	if (!pdata && !of) {
		dev_err(&pdev->dev, "No platform data provided!\n");
		return -ENODEV;
	}

	res_mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
	if (!res_mem)
		return -ENODEV;

	if (!devm_request_mem_region(&pdev->dev, res_mem->start,
				     resource_size(res_mem), DRV_NAME))
		return -EBUSY;

	addr = devm_ioremap_nocache(&pdev->dev, res_mem->start,
				    resource_size(res_mem));
	if (!addr)
		return -ENOMEM;

	if (of)
		irq = irq_of_parse_and_map(of, 0);
	else
		res_irq = platform_get_resource(pdev, IORESOURCE_IRQ, 0);

	if (!irq && !res_irq)
		return -ENODEV;

	dev = alloc_sja1000dev(0);
	if (!dev)
		return -ENOMEM;
	priv = netdev_priv(dev);

	if (res_irq) {
		irq = res_irq->start;
		priv->irq_flags = res_irq->flags & IRQF_TRIGGER_MASK;
		if (res_irq->flags & IORESOURCE_IRQ_SHAREABLE)
			priv->irq_flags |= IRQF_SHARED;
	} else {
		priv->irq_flags = IRQF_SHARED;
	}

	dev->irq = irq;
	priv->reg_base = addr;

	if (of)
		sp_populate_of(priv, of);
	else
		sp_populate(priv, pdata, res_mem->flags);

	platform_set_drvdata(pdev, 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 (reg_base=%p, irq=%d)\n",
		 DRV_NAME, priv->reg_base, dev->irq);
	return 0;

 exit_free:
	free_sja1000dev(dev);
	return err;
}

static int sp_remove(struct platform_device *pdev)
{
	struct net_device *dev = platform_get_drvdata(pdev);

	unregister_sja1000dev(dev);
	free_sja1000dev(dev);

	return 0;
}

static const struct of_device_id sp_of_table[] = {
	{.compatible = "nxp,sja1000"},
	{},
};
MODULE_DEVICE_TABLE(of, sp_of_table);

static struct platform_driver sp_driver = {
	.probe = sp_probe,
	.remove = sp_remove,
	.driver = {
		.name = DRV_NAME,
		.of_match_table = sp_of_table,
	},
};

module_platform_driver(sp_driver);
Commit	Line	Data
f534e52f WG	1	/*
	2	* Copyright (C) 2005 Sascha Hauer, Pengutronix
	3	* Copyright (C) 2007 Wolfgang Grandegger <wg@grandegger.com>
	4	*
	5	* This program is free software; you can redistribute it and/or modify
	6	* it under the terms of the version 2 of the GNU General Public License
	7	* as published by the Free Software Foundation
	8	*
	9	* This program is distributed in the hope that it will be useful,
	10	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	11	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	12	* GNU General Public License for more details.
	13	*
	14	* You should have received a copy of the GNU General Public License
05780d98	15	* along with this program; if not, see <http://www.gnu.org/licenses/>.
f534e52f WG	16	*/
	17
	18	#include <linux/kernel.h>
	19	#include <linux/module.h>
	20	#include <linux/interrupt.h>
	21	#include <linux/netdevice.h>
	22	#include <linux/delay.h>
	23	#include <linux/pci.h>
	24	#include <linux/platform_device.h>
	25	#include <linux/irq.h>
f534e52f WG	26	#include <linux/can/dev.h>
	27	#include <linux/can/platform/sja1000.h>
	28	#include <linux/io.h>
02729c3d FV	29	#include <linux/of.h>
02729c3d FV	30	#include <linux/of_irq.h>
f534e52f WG	31
	32	#include "sja1000.h"
	33
	34	#define DRV_NAME "sja1000_platform"
02729c3d	35	#define SP_CAN_CLOCK (16000000 / 2)
f534e52f WG	36
f534e52f WG	37	MODULE_AUTHOR("Sascha Hauer <s.hauer@pengutronix.de>");
02729c3d	38	MODULE_AUTHOR("Wolfgang Grandegger <wg@grandegger.com>");
f534e52f	39	MODULE_DESCRIPTION("Socket-CAN driver for SJA1000 on the platform bus");
d8c4386d	40	MODULE_ALIAS("platform:" DRV_NAME);
f534e52f WG	41	MODULE_LICENSE("GPL v2");
f534e52f WG	42
986917b7	43	static u8 sp_read_reg8(const struct sja1000_priv *priv, int reg)
f534e52f	44	{
255a9154	45	return ioread8(priv->reg_base + reg);
f534e52f WG	46	}
f534e52f WG	47
986917b7	48	static void sp_write_reg8(const struct sja1000_priv *priv, int reg, u8 val)
f534e52f	49	{
255a9154	50	iowrite8(val, priv->reg_base + reg);
f534e52f WG	51	}
f534e52f WG	52
986917b7 YY	53	static u8 sp_read_reg16(const struct sja1000_priv *priv, int reg)
	54	{
	55	return ioread8(priv->reg_base + reg * 2);
	56	}
	57
	58	static void sp_write_reg16(const struct sja1000_priv *priv, int reg, u8 val)
	59	{
	60	iowrite8(val, priv->reg_base + reg * 2);
	61	}
	62
	63	static u8 sp_read_reg32(const struct sja1000_priv *priv, int reg)
	64	{
	65	return ioread8(priv->reg_base + reg * 4);
	66	}
	67
	68	static void sp_write_reg32(const struct sja1000_priv *priv, int reg, u8 val)
	69	{
	70	iowrite8(val, priv->reg_base + reg * 4);
	71	}
	72
02729c3d FV	73	static void sp_populate(struct sja1000_priv *priv,
	74	struct sja1000_platform_data *pdata,
	75	unsigned long resource_mem_flags)
	76	{
	77	/* The CAN clock frequency is half the oscillator clock frequency */
	78	priv->can.clock.freq = pdata->osc_freq / 2;
	79	priv->ocr = pdata->ocr;
	80	priv->cdr = pdata->cdr;
	81
	82	switch (resource_mem_flags & IORESOURCE_MEM_TYPE_MASK) {
	83	case IORESOURCE_MEM_32BIT:
	84	priv->read_reg = sp_read_reg32;
	85	priv->write_reg = sp_write_reg32;
	86	break;
	87	case IORESOURCE_MEM_16BIT:
	88	priv->read_reg = sp_read_reg16;
	89	priv->write_reg = sp_write_reg16;
	90	break;
	91	case IORESOURCE_MEM_8BIT:
	92	default:
	93	priv->read_reg = sp_read_reg8;
	94	priv->write_reg = sp_write_reg8;
	95	break;
	96	}
	97	}
	98
	99	static void sp_populate_of(struct sja1000_priv priv, struct device_node of)
f534e52f WG	100	{
f534e52f WG	101	int err;
02729c3d FV	102	u32 prop;
02729c3d FV	103
b18ec27c FV	104	err = of_property_read_u32(of, "reg-io-width", &prop);
	105	if (err)
	106	prop = 1; /* 8 bit is default */
	107
	108	switch (prop) {
	109	case 4:
	110	priv->read_reg = sp_read_reg32;
	111	priv->write_reg = sp_write_reg32;
	112	break;
	113	case 2:
	114	priv->read_reg = sp_read_reg16;
	115	priv->write_reg = sp_write_reg16;
	116	break;
	117	case 1: /* fallthrough */
	118	default:
	119	priv->read_reg = sp_read_reg8;
	120	priv->write_reg = sp_write_reg8;
	121	}
02729c3d FV	122
	123	err = of_property_read_u32(of, "nxp,external-clock-frequency", &prop);
	124	if (!err)
	125	priv->can.clock.freq = prop / 2;
	126	else
	127	priv->can.clock.freq = SP_CAN_CLOCK; /* default */
	128
	129	err = of_property_read_u32(of, "nxp,tx-output-mode", &prop);
	130	if (!err)
	131	priv->ocr \|= prop & OCR_MODE_MASK;
	132	else
	133	priv->ocr \|= OCR_MODE_NORMAL; /* default */
	134
	135	err = of_property_read_u32(of, "nxp,tx-output-config", &prop);
	136	if (!err)
	137	priv->ocr \|= (prop << OCR_TX_SHIFT) & OCR_TX_MASK;
	138	else
	139	priv->ocr \|= OCR_TX0_PULLDOWN; /* default */
	140
	141	err = of_property_read_u32(of, "nxp,clock-out-frequency", &prop);
	142	if (!err && prop) {
	143	u32 divider = priv->can.clock.freq * 2 / prop;
	144
	145	if (divider > 1)
	146	priv->cdr \|= divider / 2 - 1;
	147	else
	148	priv->cdr \|= CDR_CLKOUT_MASK;
	149	} else {
	150	priv->cdr \|= CDR_CLK_OFF; /* default */
	151	}
	152
	153	if (!of_property_read_bool(of, "nxp,no-comparator-bypass"))
	154	priv->cdr \|= CDR_CBP; /* default */
	155	}
	156
	157	static int sp_probe(struct platform_device *pdev)
	158	{
	159	int err, irq = 0;
f534e52f WG	160	void __iomem *addr;
	161	struct net_device *dev;
	162	struct sja1000_priv *priv;
02729c3d	163	struct resource res_mem, res_irq = NULL;
f534e52f	164	struct sja1000_platform_data *pdata;
02729c3d	165	struct device_node *of = pdev->dev.of_node;
f534e52f	166
ecd78d97	167	pdata = dev_get_platdata(&pdev->dev);
02729c3d	168	if (!pdata && !of) {
f534e52f	169	dev_err(&pdev->dev, "No platform data provided!\n");
342180f7	170	return -ENODEV;
f534e52f WG	171	}
	172
	173	res_mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
02729c3d	174	if (!res_mem)
342180f7	175	return -ENODEV;
f534e52f	176
342180f7 FV	177	if (!devm_request_mem_region(&pdev->dev, res_mem->start,
	178	resource_size(res_mem), DRV_NAME))
	179	return -EBUSY;
f534e52f	180
342180f7 FV	181	addr = devm_ioremap_nocache(&pdev->dev, res_mem->start,
	182	resource_size(res_mem));
	183	if (!addr)
	184	return -ENOMEM;
f534e52f	185
02729c3d FV	186	if (of)
	187	irq = irq_of_parse_and_map(of, 0);
	188	else
	189	res_irq = platform_get_resource(pdev, IORESOURCE_IRQ, 0);
	190
	191	if (!irq && !res_irq)
	192	return -ENODEV;
	193
f534e52f	194	dev = alloc_sja1000dev(0);
342180f7 FV	195	if (!dev)
342180f7 FV	196	return -ENOMEM;
f534e52f WG	197	priv = netdev_priv(dev);
f534e52f WG	198
02729c3d FV	199	if (res_irq) {
	200	irq = res_irq->start;
	201	priv->irq_flags = res_irq->flags & IRQF_TRIGGER_MASK;
	202	if (res_irq->flags & IORESOURCE_IRQ_SHAREABLE)
	203	priv->irq_flags \|= IRQF_SHARED;
	204	} else {
	205	priv->irq_flags = IRQF_SHARED;
	206	}
	207
	208	dev->irq = irq;
255a9154	209	priv->reg_base = addr;
f534e52f	210
02729c3d FV	211	if (of)
	212	sp_populate_of(priv, of);
	213	else
	214	sp_populate(priv, pdata, res_mem->flags);
986917b7	215
00e4bbc8	216	platform_set_drvdata(pdev, dev);
f534e52f WG	217	SET_NETDEV_DEV(dev, &pdev->dev);
	218
	219	err = register_sja1000dev(dev);
	220	if (err) {
	221	dev_err(&pdev->dev, "registering %s failed (err=%d)\n",
	222	DRV_NAME, err);
	223	goto exit_free;
	224	}
	225
255a9154 WG	226	dev_info(&pdev->dev, "%s device registered (reg_base=%p, irq=%d)\n",
255a9154 WG	227	DRV_NAME, priv->reg_base, dev->irq);
f534e52f WG	228	return 0;
	229
	230	exit_free:
	231	free_sja1000dev(dev);
f534e52f WG	232	return err;
	233	}
	234
	235	static int sp_remove(struct platform_device *pdev)
	236	{
00e4bbc8	237	struct net_device *dev = platform_get_drvdata(pdev);
f534e52f WG	238
f534e52f WG	239	unregister_sja1000dev(dev);
f534e52f WG	240	free_sja1000dev(dev);
	241
	242	return 0;
	243	}
	244
486e9570	245	static const struct of_device_id sp_of_table[] = {
02729c3d FV	246	{.compatible = "nxp,sja1000"},
	247	{},
	248	};
	249	MODULE_DEVICE_TABLE(of, sp_of_table);
	250
f534e52f WG	251	static struct platform_driver sp_driver = {
	252	.probe = sp_probe,
	253	.remove = sp_remove,
	254	.driver = {
	255	.name = DRV_NAME,
02729c3d	256	.of_match_table = sp_of_table,
f534e52f WG	257	},
	258	};
	259
871d3372	260	module_platform_driver(sp_driver);