[deliverable/linux.git] / arch / arm / plat-pxa / ssp.c

/*
 *  linux/arch/arm/mach-pxa/ssp.c
 *
 *  based on linux/arch/arm/mach-sa1100/ssp.c by Russell King
 *
 *  Copyright (C) 2003 Russell King.
 *  Copyright (C) 2003 Wolfson Microelectronics PLC
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation.
 *
 *  PXA2xx SSP driver.  This provides the generic core for simple
 *  IO-based SSP applications and allows easy port setup for DMA access.
 *
 *  Author: Liam Girdwood <liam.girdwood@wolfsonmicro.com>
 */

#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/sched.h>
#include <linux/slab.h>
#include <linux/errno.h>
#include <linux/interrupt.h>
#include <linux/ioport.h>
#include <linux/init.h>
#include <linux/mutex.h>
#include <linux/clk.h>
#include <linux/err.h>
#include <linux/platform_device.h>
#include <linux/spi/pxa2xx_spi.h>
#include <linux/io.h>
#include <linux/of.h>
#include <linux/of_device.h>

#include <asm/irq.h>

static DEFINE_MUTEX(ssp_lock);
static LIST_HEAD(ssp_list);

struct ssp_device *pxa_ssp_request(int port, const char *label)
{
	struct ssp_device *ssp = NULL;

	mutex_lock(&ssp_lock);

	list_for_each_entry(ssp, &ssp_list, node) {
		if (ssp->port_id == port && ssp->use_count == 0) {
			ssp->use_count++;
			ssp->label = label;
			break;
		}
	}

	mutex_unlock(&ssp_lock);

	if (&ssp->node == &ssp_list)
		return NULL;

	return ssp;
}
EXPORT_SYMBOL(pxa_ssp_request);

struct ssp_device *pxa_ssp_request_of(const struct device_node *of_node,
				      const char *label)
{
	struct ssp_device *ssp = NULL;

	mutex_lock(&ssp_lock);

	list_for_each_entry(ssp, &ssp_list, node) {
		if (ssp->of_node == of_node && ssp->use_count == 0) {
			ssp->use_count++;
			ssp->label = label;
			break;
		}
	}

	mutex_unlock(&ssp_lock);

	if (&ssp->node == &ssp_list)
		return NULL;

	return ssp;
}
EXPORT_SYMBOL(pxa_ssp_request_of);

void pxa_ssp_free(struct ssp_device *ssp)
{
	mutex_lock(&ssp_lock);
	if (ssp->use_count) {
		ssp->use_count--;
		ssp->label = NULL;
	} else
		dev_err(&ssp->pdev->dev, "device already free\n");
	mutex_unlock(&ssp_lock);
}
EXPORT_SYMBOL(pxa_ssp_free);

#ifdef CONFIG_OF
static const struct of_device_id pxa_ssp_of_ids[] = {
	{ .compatible = "mrvl,pxa25x-ssp",	.data = (void *) PXA25x_SSP },
	{ .compatible = "mvrl,pxa25x-nssp",	.data = (void *) PXA25x_NSSP },
	{ .compatible = "mrvl,pxa27x-ssp",	.data = (void *) PXA27x_SSP },
	{ .compatible = "mrvl,pxa3xx-ssp",	.data = (void *) PXA3xx_SSP },
	{ .compatible = "mvrl,pxa168-ssp",	.data = (void *) PXA168_SSP },
	{ .compatible = "mrvl,pxa910-ssp",	.data = (void *) PXA910_SSP },
	{ .compatible = "mrvl,ce4100-ssp",	.data = (void *) CE4100_SSP },
	{ },
};
MODULE_DEVICE_TABLE(of, pxa_ssp_of_ids);
#endif

static int pxa_ssp_probe(struct platform_device *pdev)
{
	struct resource *res;
	struct ssp_device *ssp;
	struct device *dev = &pdev->dev;

	ssp = devm_kzalloc(dev, sizeof(struct ssp_device), GFP_KERNEL);
	if (ssp == NULL)
		return -ENOMEM;

	ssp->pdev = pdev;

	ssp->clk = devm_clk_get(dev, NULL);
	if (IS_ERR(ssp->clk))
		return PTR_ERR(ssp->clk);

	if (dev->of_node) {
		struct of_phandle_args dma_spec;
		struct device_node *np = dev->of_node;
		int ret;

		/*
		 * FIXME: we should allocate the DMA channel from this
		 * context and pass the channel down to the ssp users.
		 * For now, we lookup the rx and tx indices manually
		 */

		/* rx */
		ret = of_parse_phandle_with_args(np, "dmas", "#dma-cells",
						 0, &dma_spec);

		if (ret) {
			dev_err(dev, "Can't parse dmas property\n");
			return -ENODEV;
		}
		ssp->drcmr_rx = dma_spec.args[0];
		of_node_put(dma_spec.np);

		/* tx */
		ret = of_parse_phandle_with_args(np, "dmas", "#dma-cells",
						 1, &dma_spec);
		if (ret) {
			dev_err(dev, "Can't parse dmas property\n");
			return -ENODEV;
		}
		ssp->drcmr_tx = dma_spec.args[0];
		of_node_put(dma_spec.np);
	} else {
		res = platform_get_resource(pdev, IORESOURCE_DMA, 0);
		if (res == NULL) {
			dev_err(dev, "no SSP RX DRCMR defined\n");
			return -ENODEV;
		}
		ssp->drcmr_rx = res->start;

		res = platform_get_resource(pdev, IORESOURCE_DMA, 1);
		if (res == NULL) {
			dev_err(dev, "no SSP TX DRCMR defined\n");
			return -ENODEV;
		}
		ssp->drcmr_tx = res->start;
	}

	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
	if (res == NULL) {
		dev_err(dev, "no memory resource defined\n");
		return -ENODEV;
	}

	res = devm_request_mem_region(dev, res->start, resource_size(res),
				      pdev->name);
	if (res == NULL) {
		dev_err(dev, "failed to request memory resource\n");
		return -EBUSY;
	}

	ssp->phys_base = res->start;

	ssp->mmio_base = devm_ioremap(dev, res->start, resource_size(res));
	if (ssp->mmio_base == NULL) {
		dev_err(dev, "failed to ioremap() registers\n");
		return -ENODEV;
	}

	ssp->irq = platform_get_irq(pdev, 0);
	if (ssp->irq < 0) {
		dev_err(dev, "no IRQ resource defined\n");
		return -ENODEV;
	}

	if (dev->of_node) {
		const struct of_device_id *id =
			of_match_device(of_match_ptr(pxa_ssp_of_ids), dev);
		ssp->type = (int) id->data;
	} else {
		const struct platform_device_id *id =
			platform_get_device_id(pdev);
		ssp->type = (int) id->driver_data;

		/* PXA2xx/3xx SSP ports starts from 1 and the internal pdev->id
		 * starts from 0, do a translation here
		 */
		ssp->port_id = pdev->id + 1;
	}

	ssp->use_count = 0;
	ssp->of_node = dev->of_node;

	mutex_lock(&ssp_lock);
	list_add(&ssp->node, &ssp_list);
	mutex_unlock(&ssp_lock);

	platform_set_drvdata(pdev, ssp);

	return 0;
}

static int pxa_ssp_remove(struct platform_device *pdev)
{
	struct resource *res;
	struct ssp_device *ssp;

	ssp = platform_get_drvdata(pdev);
	if (ssp == NULL)
		return -ENODEV;

	iounmap(ssp->mmio_base);

	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
	release_mem_region(res->start, resource_size(res));

	clk_put(ssp->clk);

	mutex_lock(&ssp_lock);
	list_del(&ssp->node);
	mutex_unlock(&ssp_lock);

	kfree(ssp);
	return 0;
}

static const struct platform_device_id ssp_id_table[] = {
	{ "pxa25x-ssp",		PXA25x_SSP },
	{ "pxa25x-nssp",	PXA25x_NSSP },
	{ "pxa27x-ssp",		PXA27x_SSP },
	{ "pxa3xx-ssp",		PXA3xx_SSP },
	{ "pxa168-ssp",		PXA168_SSP },
	{ "pxa910-ssp",		PXA910_SSP },
	{ },
};

static struct platform_driver pxa_ssp_driver = {
	.probe		= pxa_ssp_probe,
	.remove		= pxa_ssp_remove,
	.driver		= {
		.name		= "pxa2xx-ssp",
		.of_match_table	= of_match_ptr(pxa_ssp_of_ids),
	},
	.id_table	= ssp_id_table,
};

static int __init pxa_ssp_init(void)
{
	return platform_driver_register(&pxa_ssp_driver);
}

static void __exit pxa_ssp_exit(void)
{
	platform_driver_unregister(&pxa_ssp_driver);
}

arch_initcall(pxa_ssp_init);
module_exit(pxa_ssp_exit);

MODULE_DESCRIPTION("PXA SSP driver");
MODULE_AUTHOR("Liam Girdwood");
MODULE_LICENSE("GPL");
Commit	Line	Data
1da177e4 LT	1	/*
	2	* linux/arch/arm/mach-pxa/ssp.c
	3	*
	4	* based on linux/arch/arm/mach-sa1100/ssp.c by Russell King
	5	*
	6	* Copyright (C) 2003 Russell King.
	7	* Copyright (C) 2003 Wolfson Microelectronics PLC
	8	*
	9	* This program is free software; you can redistribute it and/or modify
	10	* it under the terms of the GNU General Public License version 2 as
	11	* published by the Free Software Foundation.
	12	*
	13	* PXA2xx SSP driver. This provides the generic core for simple
	14	* IO-based SSP applications and allows easy port setup for DMA access.
	15	*
	16	* Author: Liam Girdwood <liam.girdwood@wolfsonmicro.com>
1da177e4 LT	17	*/
	18
	19	#include <linux/module.h>
	20	#include <linux/kernel.h>
	21	#include <linux/sched.h>
	22	#include <linux/slab.h>
	23	#include <linux/errno.h>
	24	#include <linux/interrupt.h>
	25	#include <linux/ioport.h>
	26	#include <linux/init.h>
00431707	27	#include <linux/mutex.h>
88286450	28	#include <linux/clk.h>
	29	#include <linux/err.h>
	30	#include <linux/platform_device.h>
8348c259	31	#include <linux/spi/pxa2xx_spi.h>
fced80c7	32	#include <linux/io.h>
a6e56c28 DM	33	#include <linux/of.h>
a6e56c28 DM	34	#include <linux/of_device.h>
88286450	35
1da177e4	36	#include <asm/irq.h>
1da177e4	37
88286450	38	static DEFINE_MUTEX(ssp_lock);
	39	static LIST_HEAD(ssp_list);
	40
baffe169	41	struct ssp_device pxa_ssp_request(int port, const char label)
88286450	42	{
	43	struct ssp_device *ssp = NULL;
	44
	45	mutex_lock(&ssp_lock);
1da177e4	46
88286450	47	list_for_each_entry(ssp, &ssp_list, node) {
	48	if (ssp->port_id == port && ssp->use_count == 0) {
	49	ssp->use_count++;
	50	ssp->label = label;
	51	break;
	52	}
1da177e4 LT	53	}
1da177e4 LT	54
88286450	55	mutex_unlock(&ssp_lock);
88286450	56
a4aff223	57	if (&ssp->node == &ssp_list)
88286450	58	return NULL;
	59
	60	return ssp;
	61	}
baffe169	62	EXPORT_SYMBOL(pxa_ssp_request);
88286450	63
6446221c DM	64	struct ssp_device pxa_ssp_request_of(const struct device_node of_node,
	65	const char *label)
	66	{
	67	struct ssp_device *ssp = NULL;
	68
	69	mutex_lock(&ssp_lock);
	70
	71	list_for_each_entry(ssp, &ssp_list, node) {
	72	if (ssp->of_node == of_node && ssp->use_count == 0) {
	73	ssp->use_count++;
	74	ssp->label = label;
	75	break;
	76	}
	77	}
	78
	79	mutex_unlock(&ssp_lock);
	80
	81	if (&ssp->node == &ssp_list)
	82	return NULL;
	83
	84	return ssp;
	85	}
	86	EXPORT_SYMBOL(pxa_ssp_request_of);
	87
baffe169	88	void pxa_ssp_free(struct ssp_device *ssp)
88286450	89	{
	90	mutex_lock(&ssp_lock);
	91	if (ssp->use_count) {
	92	ssp->use_count--;
	93	ssp->label = NULL;
	94	} else
	95	dev_err(&ssp->pdev->dev, "device already free\n");
	96	mutex_unlock(&ssp_lock);
1da177e4	97	}
baffe169	98	EXPORT_SYMBOL(pxa_ssp_free);
88286450	99
a6e56c28 DM	100	#ifdef CONFIG_OF
	101	static const struct of_device_id pxa_ssp_of_ids[] = {
	102	{ .compatible = "mrvl,pxa25x-ssp", .data = (void *) PXA25x_SSP },
	103	{ .compatible = "mvrl,pxa25x-nssp", .data = (void *) PXA25x_NSSP },
	104	{ .compatible = "mrvl,pxa27x-ssp", .data = (void *) PXA27x_SSP },
	105	{ .compatible = "mrvl,pxa3xx-ssp", .data = (void *) PXA3xx_SSP },
	106	{ .compatible = "mvrl,pxa168-ssp", .data = (void *) PXA168_SSP },
	107	{ .compatible = "mrvl,pxa910-ssp", .data = (void *) PXA910_SSP },
	108	{ .compatible = "mrvl,ce4100-ssp", .data = (void *) CE4100_SSP },
a6e56c28 DM	109	{ },
	110	};
	111	MODULE_DEVICE_TABLE(of, pxa_ssp_of_ids);
	112	#endif
	113
351a102d	114	static int pxa_ssp_probe(struct platform_device *pdev)
88286450	115	{
	116	struct resource *res;
	117	struct ssp_device *ssp;
970d8a71	118	struct device *dev = &pdev->dev;
88286450	119
1c459de1	120	ssp = devm_kzalloc(dev, sizeof(struct ssp_device), GFP_KERNEL);
64be2814	121	if (ssp == NULL)
88286450	122	return -ENOMEM;
64be2814	123
919dcb21	124	ssp->pdev = pdev;
88286450	125
1c459de1 DM	126	ssp->clk = devm_clk_get(dev, NULL);
	127	if (IS_ERR(ssp->clk))
	128	return PTR_ERR(ssp->clk);
88286450	129
a6e56c28 DM	130	if (dev->of_node) {
	131	struct of_phandle_args dma_spec;
	132	struct device_node *np = dev->of_node;
d5ece937	133	int ret;
a6e56c28 DM	134
	135	/*
	136	* FIXME: we should allocate the DMA channel from this
	137	* context and pass the channel down to the ssp users.
	138	* For now, we lookup the rx and tx indices manually
	139	*/
	140
	141	/* rx */
d5ece937 OJ	142	ret = of_parse_phandle_with_args(np, "dmas", "#dma-cells",
	143	0, &dma_spec);
	144
	145	if (ret) {
	146	dev_err(dev, "Can't parse dmas property\n");
	147	return -ENODEV;
	148	}
a6e56c28 DM	149	ssp->drcmr_rx = dma_spec.args[0];
	150	of_node_put(dma_spec.np);
	151
	152	/* tx */
d5ece937 OJ	153	ret = of_parse_phandle_with_args(np, "dmas", "#dma-cells",
	154	1, &dma_spec);
	155	if (ret) {
	156	dev_err(dev, "Can't parse dmas property\n");
	157	return -ENODEV;
	158	}
a6e56c28 DM	159	ssp->drcmr_tx = dma_spec.args[0];
	160	of_node_put(dma_spec.np);
	161	} else {
	162	res = platform_get_resource(pdev, IORESOURCE_DMA, 0);
	163	if (res == NULL) {
	164	dev_err(dev, "no SSP RX DRCMR defined\n");
	165	return -ENODEV;
	166	}
	167	ssp->drcmr_rx = res->start;
077de1ad	168
a6e56c28 DM	169	res = platform_get_resource(pdev, IORESOURCE_DMA, 1);
	170	if (res == NULL) {
	171	dev_err(dev, "no SSP TX DRCMR defined\n");
	172	return -ENODEV;
	173	}
	174	ssp->drcmr_tx = res->start;
077de1ad	175	}
077de1ad	176
88286450	177	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
88286450	178	if (res == NULL) {
970d8a71	179	dev_err(dev, "no memory resource defined\n");
1c459de1	180	return -ENODEV;
88286450	181	}
88286450	182
1c459de1 DM	183	res = devm_request_mem_region(dev, res->start, resource_size(res),
1c459de1 DM	184	pdev->name);
88286450	185	if (res == NULL) {
970d8a71	186	dev_err(dev, "failed to request memory resource\n");
1c459de1	187	return -EBUSY;
88286450	188	}
	189
	190	ssp->phys_base = res->start;
	191
1c459de1	192	ssp->mmio_base = devm_ioremap(dev, res->start, resource_size(res));
88286450	193	if (ssp->mmio_base == NULL) {
970d8a71	194	dev_err(dev, "failed to ioremap() registers\n");
1c459de1	195	return -ENODEV;
88286450	196	}
	197
	198	ssp->irq = platform_get_irq(pdev, 0);
	199	if (ssp->irq < 0) {
970d8a71	200	dev_err(dev, "no IRQ resource defined\n");
1c459de1	201	return -ENODEV;
88286450	202	}
88286450	203
a6e56c28 DM	204	if (dev->of_node) {
	205	const struct of_device_id *id =
	206	of_match_device(of_match_ptr(pxa_ssp_of_ids), dev);
	207	ssp->type = (int) id->data;
	208	} else {
	209	const struct platform_device_id *id =
	210	platform_get_device_id(pdev);
	211	ssp->type = (int) id->driver_data;
	212
	213	/* PXA2xx/3xx SSP ports starts from 1 and the internal pdev->id
	214	* starts from 0, do a translation here
	215	*/
	216	ssp->port_id = pdev->id + 1;
	217	}
	218
88286450	219	ssp->use_count = 0;
6446221c	220	ssp->of_node = dev->of_node;
88286450	221
	222	mutex_lock(&ssp_lock);
	223	list_add(&ssp->node, &ssp_list);
	224	mutex_unlock(&ssp_lock);
	225
	226	platform_set_drvdata(pdev, ssp);
88286450	227
1c459de1	228	return 0;
88286450	229	}
88286450	230
351a102d	231	static int pxa_ssp_remove(struct platform_device *pdev)
88286450	232	{
	233	struct resource *res;
	234	struct ssp_device *ssp;
	235
	236	ssp = platform_get_drvdata(pdev);
	237	if (ssp == NULL)
	238	return -ENODEV;
	239
	240	iounmap(ssp->mmio_base);
	241
	242	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
c8ee5c69	243	release_mem_region(res->start, resource_size(res));
88286450	244
88286450	245	clk_put(ssp->clk);
1da177e4	246
88286450	247	mutex_lock(&ssp_lock);
	248	list_del(&ssp->node);
	249	mutex_unlock(&ssp_lock);
	250
	251	kfree(ssp);
	252	return 0;
	253	}
	254
6427d450 EM	255	static const struct platform_device_id ssp_id_table[] = {
	256	{ "pxa25x-ssp", PXA25x_SSP },
	257	{ "pxa25x-nssp", PXA25x_NSSP },
	258	{ "pxa27x-ssp", PXA27x_SSP },
6f0243a1	259	{ "pxa3xx-ssp", PXA3xx_SSP },
7e499228	260	{ "pxa168-ssp", PXA168_SSP },
60172215	261	{ "pxa910-ssp", PXA910_SSP },
6427d450	262	{ },
88286450	263	};
88286450	264
baffe169 HZ	265	static struct platform_driver pxa_ssp_driver = {
baffe169 HZ	266	.probe = pxa_ssp_probe,
351a102d	267	.remove = pxa_ssp_remove,
88286450	268	.driver = {
a6e56c28 DM	269	.name = "pxa2xx-ssp",
a6e56c28 DM	270	.of_match_table = of_match_ptr(pxa_ssp_of_ids),
88286450	271	},
6427d450	272	.id_table = ssp_id_table,
88286450	273	};
	274
	275	static int __init pxa_ssp_init(void)
	276	{
baffe169	277	return platform_driver_register(&pxa_ssp_driver);
88286450	278	}
	279
	280	static void __exit pxa_ssp_exit(void)
	281	{
baffe169	282	platform_driver_unregister(&pxa_ssp_driver);
1da177e4 LT	283	}
1da177e4 LT	284
cae05541	285	arch_initcall(pxa_ssp_init);
88286450	286	module_exit(pxa_ssp_exit);
1da177e4	287
1da177e4 LT	288	MODULE_DESCRIPTION("PXA SSP driver");
	289	MODULE_AUTHOR("Liam Girdwood");
	290	MODULE_LICENSE("GPL");