[deliverable/linux.git] / arch / arm / mach-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>
 *
 *  Revision history:
 *   22nd Aug 2003 Initial version.
 *   20th Dec 2004 Added ssp_config for changing port config without
 *                 closing the port.
 *    4th Aug 2005 Added option to disable irq handler registration and
 *                 cleaned up irq and clock detection.
 */

#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 <asm/io.h>
#include <asm/irq.h>
#include <asm/hardware.h>
#include <asm/arch/ssp.h>
#include <asm/arch/pxa-regs.h>
#include <asm/arch/regs-ssp.h>

#define TIMEOUT 100000

static irqreturn_t ssp_interrupt(int irq, void *dev_id)
{
	struct ssp_dev *dev = (struct ssp_dev*) dev_id;
	struct ssp_device *ssp = dev->ssp;
	unsigned int status;

	status = __raw_readl(ssp->mmio_base + SSSR);
	__raw_writel(status, ssp->mmio_base + SSSR);

	if (status & SSSR_ROR)
		printk(KERN_WARNING "SSP(%d): receiver overrun\n", dev->port);

	if (status & SSSR_TUR)
		printk(KERN_WARNING "SSP(%d): transmitter underrun\n", dev->port);

	if (status & SSSR_BCE)
		printk(KERN_WARNING "SSP(%d): bit count error\n", dev->port);

	return IRQ_HANDLED;
}

/**
 * ssp_write_word - write a word to the SSP port
 * @data: 32-bit, MSB justified data to write.
 *
 * Wait for a free entry in the SSP transmit FIFO, and write a data
 * word to the SSP port.
 *
 * The caller is expected to perform the necessary locking.
 *
 * Returns:
 *   %-ETIMEDOUT	timeout occurred
 *   0			success
 */
int ssp_write_word(struct ssp_dev *dev, u32 data)
{
	struct ssp_device *ssp = dev->ssp;
	int timeout = TIMEOUT;

	while (!(__raw_readl(ssp->mmio_base + SSSR) & SSSR_TNF)) {
	        if (!--timeout)
	        	return -ETIMEDOUT;
		cpu_relax();
	}

	__raw_writel(data, ssp->mmio_base + SSDR);

	return 0;
}

/**
 * ssp_read_word - read a word from the SSP port
 *
 * Wait for a data word in the SSP receive FIFO, and return the
 * received data.  Data is LSB justified.
 *
 * Note: Currently, if data is not expected to be received, this
 * function will wait for ever.
 *
 * The caller is expected to perform the necessary locking.
 *
 * Returns:
 *   %-ETIMEDOUT	timeout occurred
 *   32-bit data	success
 */
int ssp_read_word(struct ssp_dev *dev, u32 *data)
{
	struct ssp_device *ssp = dev->ssp;
	int timeout = TIMEOUT;

	while (!(__raw_readl(ssp->mmio_base + SSSR) & SSSR_RNE)) {
	        if (!--timeout)
	        	return -ETIMEDOUT;
		cpu_relax();
	}

	*data = __raw_readl(ssp->mmio_base + SSDR);
	return 0;
}

/**
 * ssp_flush - flush the transmit and receive FIFOs
 *
 * Wait for the SSP to idle, and ensure that the receive FIFO
 * is empty.
 *
 * The caller is expected to perform the necessary locking.
 */
int ssp_flush(struct ssp_dev *dev)
{
	struct ssp_device *ssp = dev->ssp;
	int timeout = TIMEOUT * 2;

	do {
		while (__raw_readl(ssp->mmio_base + SSSR) & SSSR_RNE) {
		        if (!--timeout)
		        	return -ETIMEDOUT;
			(void)__raw_readl(ssp->mmio_base + SSDR);
		}
	        if (!--timeout)
	        	return -ETIMEDOUT;
	} while (__raw_readl(ssp->mmio_base + SSSR) & SSSR_BSY);

	return 0;
}

/**
 * ssp_enable - enable the SSP port
 *
 * Turn on the SSP port.
 */
void ssp_enable(struct ssp_dev *dev)
{
	struct ssp_device *ssp = dev->ssp;
	uint32_t sscr0;

	sscr0 = __raw_readl(ssp->mmio_base + SSCR0);
	sscr0 |= SSCR0_SSE;
	__raw_writel(sscr0, ssp->mmio_base + SSCR0);
}

/**
 * ssp_disable - shut down the SSP port
 *
 * Turn off the SSP port, optionally powering it down.
 */
void ssp_disable(struct ssp_dev *dev)
{
	struct ssp_device *ssp = dev->ssp;
	uint32_t sscr0;

	sscr0 = __raw_readl(ssp->mmio_base + SSCR0);
	sscr0 &= ~SSCR0_SSE;
	__raw_writel(sscr0, ssp->mmio_base + SSCR0);
}

/**
 * ssp_save_state - save the SSP configuration
 * @ssp: pointer to structure to save SSP configuration
 *
 * Save the configured SSP state for suspend.
 */
void ssp_save_state(struct ssp_dev *dev, struct ssp_state *state)
{
	struct ssp_device *ssp = dev->ssp;

	state->cr0 = __raw_readl(ssp->mmio_base + SSCR0);
	state->cr1 = __raw_readl(ssp->mmio_base + SSCR1);
	state->to  = __raw_readl(ssp->mmio_base + SSTO);
	state->psp = __raw_readl(ssp->mmio_base + SSPSP);

	ssp_disable(dev);
}

/**
 * ssp_restore_state - restore a previously saved SSP configuration
 * @ssp: pointer to configuration saved by ssp_save_state
 *
 * Restore the SSP configuration saved previously by ssp_save_state.
 */
void ssp_restore_state(struct ssp_dev *dev, struct ssp_state *state)
{
	struct ssp_device *ssp = dev->ssp;
	uint32_t sssr = SSSR_ROR | SSSR_TUR | SSSR_BCE;

	__raw_writel(sssr, ssp->mmio_base + SSSR);

	__raw_writel(state->cr0 & ~SSCR0_SSE, ssp->mmio_base + SSCR0);
	__raw_writel(state->cr1, ssp->mmio_base + SSCR1);
	__raw_writel(state->to,  ssp->mmio_base + SSTO);
	__raw_writel(state->psp, ssp->mmio_base + SSPSP);
	__raw_writel(state->cr0, ssp->mmio_base + SSCR0);
}

/**
 * ssp_config - configure SSP port settings
 * @mode: port operating mode
 * @flags: port config flags
 * @psp_flags: port PSP config flags
 * @speed: port speed
 *
 * Port MUST be disabled by ssp_disable before making any config changes.
 */
int ssp_config(struct ssp_dev *dev, u32 mode, u32 flags, u32 psp_flags, u32 speed)
{
	struct ssp_device *ssp = dev->ssp;

	dev->mode = mode;
	dev->flags = flags;
	dev->psp_flags = psp_flags;
	dev->speed = speed;

	/* set up port type, speed, port settings */
	__raw_writel((dev->speed | dev->mode), ssp->mmio_base + SSCR0);
	__raw_writel(dev->flags, ssp->mmio_base + SSCR1);
	__raw_writel(dev->psp_flags, ssp->mmio_base + SSPSP);

	return 0;
}

/**
 * ssp_init - setup the SSP port
 *
 * initialise and claim resources for the SSP port.
 *
 * Returns:
 *   %-ENODEV	if the SSP port is unavailable
 *   %-EBUSY	if the resources are already in use
 *   %0		on success
 */
int ssp_init(struct ssp_dev *dev, u32 port, u32 init_flags)
{
	struct ssp_device *ssp;
	int ret;

	ssp = ssp_request(port, "SSP");
	if (ssp == NULL)
		return -ENODEV;

	dev->ssp = ssp;
	dev->port = port;

	/* do we need to get irq */
	if (!(init_flags & SSP_NO_IRQ)) {
		ret = request_irq(ssp->irq, ssp_interrupt,
				0, "SSP", dev);
	    	if (ret)
			goto out_region;
		dev->irq = ssp->irq;
	} else
		dev->irq = 0;

	/* turn on SSP port clock */
	clk_enable(ssp->clk);
	return 0;

out_region:
	ssp_free(ssp);
	return ret;
}

/**
 * ssp_exit - undo the effects of ssp_init
 *
 * release and free resources for the SSP port.
 */
void ssp_exit(struct ssp_dev *dev)
{
	struct ssp_device *ssp = dev->ssp;

	ssp_disable(dev);
	free_irq(dev->irq, dev);
	clk_disable(ssp->clk);
	ssp_free(ssp);
}

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

struct ssp_device *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->port_id != port)
		return NULL;

	return ssp;
}
EXPORT_SYMBOL(ssp_request);

void 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(ssp_free);

static int __devinit ssp_probe(struct platform_device *pdev, int type)
{
	struct resource *res;
	struct ssp_device *ssp;
	int ret = 0;

	ssp = kzalloc(sizeof(struct ssp_device), GFP_KERNEL);
	if (ssp == NULL) {
		dev_err(&pdev->dev, "failed to allocate memory");
		return -ENOMEM;
	}

	ssp->clk = clk_get(&pdev->dev, "SSPCLK");
	if (IS_ERR(ssp->clk)) {
		ret = PTR_ERR(ssp->clk);
		goto err_free;
	}

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

	res = request_mem_region(res->start, res->end - res->start + 1,
			pdev->name);
	if (res == NULL) {
		dev_err(&pdev->dev, "failed to request memory resource\n");
		ret = -EBUSY;
		goto err_free_clk;
	}

	ssp->phys_base = res->start;

	ssp->mmio_base = ioremap(res->start, res->end - res->start + 1);
	if (ssp->mmio_base == NULL) {
		dev_err(&pdev->dev, "failed to ioremap() registers\n");
		ret = -ENODEV;
		goto err_free_mem;
	}

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

	res = platform_get_resource(pdev, IORESOURCE_DMA, 0);
	if (res == NULL) {
		dev_err(&pdev->dev, "no SSP RX DRCMR defined\n");
		ret = -ENODEV;
		goto err_free_io;
	}
	ssp->drcmr_rx = res->start;

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

	/* 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->type = type;

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

	platform_set_drvdata(pdev, ssp);
	return 0;

err_free_io:
	iounmap(ssp->mmio_base);
err_free_mem:
	release_mem_region(res->start, res->end - res->start + 1);
err_free_clk:
	clk_put(ssp->clk);
err_free:
	kfree(ssp);
	return ret;
}

static int __devexit 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, res->end - res->start + 1);

	clk_put(ssp->clk);

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

	kfree(ssp);
	return 0;
}

static int __devinit pxa25x_ssp_probe(struct platform_device *pdev)
{
	return ssp_probe(pdev, PXA25x_SSP);
}

static int __devinit pxa25x_nssp_probe(struct platform_device *pdev)
{
	return ssp_probe(pdev, PXA25x_NSSP);
}

static int __devinit pxa27x_ssp_probe(struct platform_device *pdev)
{
	return ssp_probe(pdev, PXA27x_SSP);
}

static struct platform_driver pxa25x_ssp_driver = {
	.driver		= {
		.name	= "pxa25x-ssp",
	},
	.probe		= pxa25x_ssp_probe,
	.remove		= __devexit_p(ssp_remove),
};

static struct platform_driver pxa25x_nssp_driver = {
	.driver		= {
		.name	= "pxa25x-nssp",
	},
	.probe		= pxa25x_nssp_probe,
	.remove		= __devexit_p(ssp_remove),
};

static struct platform_driver pxa27x_ssp_driver = {
	.driver		= {
		.name	= "pxa27x-ssp",
	},
	.probe		= pxa27x_ssp_probe,
	.remove		= __devexit_p(ssp_remove),
};

static int __init pxa_ssp_init(void)
{
	int ret = 0;

	ret = platform_driver_register(&pxa25x_ssp_driver);
	if (ret) {
		printk(KERN_ERR "failed to register pxa25x_ssp_driver");
		return ret;
	}

	ret = platform_driver_register(&pxa25x_nssp_driver);
	if (ret) {
		printk(KERN_ERR "failed to register pxa25x_nssp_driver");
		return ret;
	}

	ret = platform_driver_register(&pxa27x_ssp_driver);
	if (ret) {
		printk(KERN_ERR "failed to register pxa27x_ssp_driver");
		return ret;
	}

	return ret;
}

static void __exit pxa_ssp_exit(void)
{
	platform_driver_unregister(&pxa25x_ssp_driver);
	platform_driver_unregister(&pxa25x_nssp_driver);
	platform_driver_unregister(&pxa27x_ssp_driver);
}

arch_initcall(pxa_ssp_init);
module_exit(pxa_ssp_exit);

EXPORT_SYMBOL(ssp_write_word);
EXPORT_SYMBOL(ssp_read_word);
EXPORT_SYMBOL(ssp_flush);
EXPORT_SYMBOL(ssp_enable);
EXPORT_SYMBOL(ssp_disable);
EXPORT_SYMBOL(ssp_save_state);
EXPORT_SYMBOL(ssp_restore_state);
EXPORT_SYMBOL(ssp_init);
EXPORT_SYMBOL(ssp_exit);
EXPORT_SYMBOL(ssp_config);

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>
	17	*
	18	* Revision history:
	19	* 22nd Aug 2003 Initial version.
	20	* 20th Dec 2004 Added ssp_config for changing port config without
	21	* closing the port.
b216c018 LG	22	* 4th Aug 2005 Added option to disable irq handler registration and
b216c018 LG	23	* cleaned up irq and clock detection.
1da177e4 LT	24	*/
	25
	26	#include <linux/module.h>
	27	#include <linux/kernel.h>
	28	#include <linux/sched.h>
	29	#include <linux/slab.h>
	30	#include <linux/errno.h>
	31	#include <linux/interrupt.h>
	32	#include <linux/ioport.h>
	33	#include <linux/init.h>
00431707	34	#include <linux/mutex.h>
88286450	35	#include <linux/clk.h>
	36	#include <linux/err.h>
	37	#include <linux/platform_device.h>
	38
1da177e4 LT	39	#include <asm/io.h>
	40	#include <asm/irq.h>
	41	#include <asm/hardware.h>
	42	#include <asm/arch/ssp.h>
	43	#include <asm/arch/pxa-regs.h>
0aea1fd5	44	#include <asm/arch/regs-ssp.h>
1da177e4	45
8f1bf874 PS	46	#define TIMEOUT 100000
8f1bf874 PS	47
0cd61b68	48	static irqreturn_t ssp_interrupt(int irq, void *dev_id)
1da177e4 LT	49	{
1da177e4 LT	50	struct ssp_dev dev = (struct ssp_dev) dev_id;
3dcb00ea	51	struct ssp_device *ssp = dev->ssp;
3dcb00ea	52	unsigned int status;
1da177e4	53
3dcb00ea	54	status = __raw_readl(ssp->mmio_base + SSSR);
3dcb00ea	55	__raw_writel(status, ssp->mmio_base + SSSR);
1da177e4 LT	56
	57	if (status & SSSR_ROR)
	58	printk(KERN_WARNING "SSP(%d): receiver overrun\n", dev->port);
	59
	60	if (status & SSSR_TUR)
	61	printk(KERN_WARNING "SSP(%d): transmitter underrun\n", dev->port);
	62
	63	if (status & SSSR_BCE)
	64	printk(KERN_WARNING "SSP(%d): bit count error\n", dev->port);
	65
	66	return IRQ_HANDLED;
	67	}
	68
	69	/**
	70	* ssp_write_word - write a word to the SSP port
	71	* @data: 32-bit, MSB justified data to write.
	72	*
	73	* Wait for a free entry in the SSP transmit FIFO, and write a data
	74	* word to the SSP port.
	75	*
	76	* The caller is expected to perform the necessary locking.
	77	*
	78	* Returns:
8f1bf874	79	* %-ETIMEDOUT timeout occurred
1da177e4 LT	80	* 0 success
	81	*/
	82	int ssp_write_word(struct ssp_dev *dev, u32 data)
	83	{
3dcb00ea	84	struct ssp_device *ssp = dev->ssp;
8f1bf874 PS	85	int timeout = TIMEOUT;
8f1bf874 PS	86
3dcb00ea	87	while (!(__raw_readl(ssp->mmio_base + SSSR) & SSSR_TNF)) {
8f1bf874 PS	88	if (!--timeout)
8f1bf874 PS	89	return -ETIMEDOUT;
1da177e4	90	cpu_relax();
8f1bf874	91	}
1da177e4	92
3dcb00ea	93	__raw_writel(data, ssp->mmio_base + SSDR);
1da177e4 LT	94
	95	return 0;
	96	}
	97
	98	/**
	99	* ssp_read_word - read a word from the SSP port
	100	*
	101	* Wait for a data word in the SSP receive FIFO, and return the
	102	* received data. Data is LSB justified.
	103	*
	104	* Note: Currently, if data is not expected to be received, this
	105	* function will wait for ever.
	106	*
	107	* The caller is expected to perform the necessary locking.
	108	*
	109	* Returns:
8f1bf874	110	* %-ETIMEDOUT timeout occurred
1da177e4 LT	111	* 32-bit data success
1da177e4 LT	112	*/
8f1bf874	113	int ssp_read_word(struct ssp_dev dev, u32 data)
1da177e4	114	{
3dcb00ea	115	struct ssp_device *ssp = dev->ssp;
8f1bf874 PS	116	int timeout = TIMEOUT;
8f1bf874 PS	117
3dcb00ea	118	while (!(__raw_readl(ssp->mmio_base + SSSR) & SSSR_RNE)) {
8f1bf874 PS	119	if (!--timeout)
8f1bf874 PS	120	return -ETIMEDOUT;
1da177e4	121	cpu_relax();
8f1bf874	122	}
1da177e4	123
3dcb00ea	124	*data = __raw_readl(ssp->mmio_base + SSDR);
8f1bf874	125	return 0;
1da177e4 LT	126	}
	127
	128	/**
	129	* ssp_flush - flush the transmit and receive FIFOs
	130	*
	131	* Wait for the SSP to idle, and ensure that the receive FIFO
	132	* is empty.
	133	*
	134	* The caller is expected to perform the necessary locking.
	135	*/
8f1bf874	136	int ssp_flush(struct ssp_dev *dev)
1da177e4	137	{
3dcb00ea	138	struct ssp_device *ssp = dev->ssp;
8f1bf874 PS	139	int timeout = TIMEOUT * 2;
8f1bf874 PS	140
1da177e4	141	do {
3dcb00ea	142	while (__raw_readl(ssp->mmio_base + SSSR) & SSSR_RNE) {
8f1bf874 PS	143	if (!--timeout)
8f1bf874 PS	144	return -ETIMEDOUT;
3dcb00ea	145	(void)__raw_readl(ssp->mmio_base + SSDR);
1da177e4	146	}
8f1bf874 PS	147	if (!--timeout)
8f1bf874 PS	148	return -ETIMEDOUT;
3dcb00ea	149	} while (__raw_readl(ssp->mmio_base + SSSR) & SSSR_BSY);
8f1bf874 PS	150
8f1bf874 PS	151	return 0;
1da177e4 LT	152	}
	153
	154	/**
	155	* ssp_enable - enable the SSP port
	156	*
	157	* Turn on the SSP port.
	158	*/
	159	void ssp_enable(struct ssp_dev *dev)
	160	{
3dcb00ea	161	struct ssp_device *ssp = dev->ssp;
	162	uint32_t sscr0;
	163
	164	sscr0 = __raw_readl(ssp->mmio_base + SSCR0);
	165	sscr0 \|= SSCR0_SSE;
	166	__raw_writel(sscr0, ssp->mmio_base + SSCR0);
1da177e4 LT	167	}
	168
	169	/**
	170	* ssp_disable - shut down the SSP port
	171	*
	172	* Turn off the SSP port, optionally powering it down.
	173	*/
	174	void ssp_disable(struct ssp_dev *dev)
	175	{
3dcb00ea	176	struct ssp_device *ssp = dev->ssp;
	177	uint32_t sscr0;
	178
	179	sscr0 = __raw_readl(ssp->mmio_base + SSCR0);
	180	sscr0 &= ~SSCR0_SSE;
	181	__raw_writel(sscr0, ssp->mmio_base + SSCR0);
1da177e4 LT	182	}
	183
	184	/**
	185	* ssp_save_state - save the SSP configuration
	186	* @ssp: pointer to structure to save SSP configuration
	187	*
	188	* Save the configured SSP state for suspend.
	189	*/
3dcb00ea	190	void ssp_save_state(struct ssp_dev dev, struct ssp_state state)
1da177e4	191	{
3dcb00ea	192	struct ssp_device *ssp = dev->ssp;
	193
	194	state->cr0 = __raw_readl(ssp->mmio_base + SSCR0);
	195	state->cr1 = __raw_readl(ssp->mmio_base + SSCR1);
	196	state->to = __raw_readl(ssp->mmio_base + SSTO);
	197	state->psp = __raw_readl(ssp->mmio_base + SSPSP);
1da177e4	198
3dcb00ea	199	ssp_disable(dev);
1da177e4 LT	200	}
	201
	202	/**
	203	* ssp_restore_state - restore a previously saved SSP configuration
	204	* @ssp: pointer to configuration saved by ssp_save_state
	205	*
	206	* Restore the SSP configuration saved previously by ssp_save_state.
	207	*/
3dcb00ea	208	void ssp_restore_state(struct ssp_dev dev, struct ssp_state state)
1da177e4	209	{
3dcb00ea	210	struct ssp_device *ssp = dev->ssp;
3dcb00ea	211	uint32_t sssr = SSSR_ROR \| SSSR_TUR \| SSSR_BCE;
1da177e4	212
3dcb00ea	213	__raw_writel(sssr, ssp->mmio_base + SSSR);
1da177e4	214
3dcb00ea	215	__raw_writel(state->cr0 & ~SSCR0_SSE, ssp->mmio_base + SSCR0);
	216	__raw_writel(state->cr1, ssp->mmio_base + SSCR1);
	217	__raw_writel(state->to, ssp->mmio_base + SSTO);
	218	__raw_writel(state->psp, ssp->mmio_base + SSPSP);
	219	__raw_writel(state->cr0, ssp->mmio_base + SSCR0);
1da177e4 LT	220	}
	221
	222	/**
	223	* ssp_config - configure SSP port settings
	224	* @mode: port operating mode
	225	* @flags: port config flags
	226	* @psp_flags: port PSP config flags
	227	* @speed: port speed
	228	*
	229	* Port MUST be disabled by ssp_disable before making any config changes.
	230	*/
	231	int ssp_config(struct ssp_dev *dev, u32 mode, u32 flags, u32 psp_flags, u32 speed)
	232	{
3dcb00ea	233	struct ssp_device *ssp = dev->ssp;
3dcb00ea	234
1da177e4 LT	235	dev->mode = mode;
	236	dev->flags = flags;
	237	dev->psp_flags = psp_flags;
	238	dev->speed = speed;
	239
	240	/* set up port type, speed, port settings */
3dcb00ea	241	__raw_writel((dev->speed \| dev->mode), ssp->mmio_base + SSCR0);
	242	__raw_writel(dev->flags, ssp->mmio_base + SSCR1);
	243	__raw_writel(dev->psp_flags, ssp->mmio_base + SSPSP);
1da177e4 LT	244
	245	return 0;
	246	}
	247
	248	/**
	249	* ssp_init - setup the SSP port
	250	*
	251	* initialise and claim resources for the SSP port.
	252	*
	253	* Returns:
	254	* %-ENODEV if the SSP port is unavailable
	255	* %-EBUSY if the resources are already in use
	256	* %0 on success
	257	*/
b216c018	258	int ssp_init(struct ssp_dev *dev, u32 port, u32 init_flags)
1da177e4	259	{
88286450	260	struct ssp_device *ssp;
b216c018	261	int ret;
1da177e4	262
88286450	263	ssp = ssp_request(port, "SSP");
88286450	264	if (ssp == NULL)
1da177e4 LT	265	return -ENODEV;
1da177e4 LT	266
88286450	267	dev->ssp = ssp;
1da177e4 LT	268	dev->port = port;
1da177e4 LT	269
b216c018 LG	270	/* do we need to get irq */
b216c018 LG	271	if (!(init_flags & SSP_NO_IRQ)) {
88286450	272	ret = request_irq(ssp->irq, ssp_interrupt,
b216c018 LG	273	0, "SSP", dev);
	274	if (ret)
	275	goto out_region;
88286450	276	dev->irq = ssp->irq;
b216c018 LG	277	} else
b216c018 LG	278	dev->irq = 0;
1da177e4 LT	279
1da177e4 LT	280	/* turn on SSP port clock */
88286450	281	clk_enable(ssp->clk);
1da177e4 LT	282	return 0;
	283
	284	out_region:
88286450	285	ssp_free(ssp);
1da177e4 LT	286	return ret;
	287	}
	288
	289	/**
	290	* ssp_exit - undo the effects of ssp_init
	291	*
	292	* release and free resources for the SSP port.
	293	*/
	294	void ssp_exit(struct ssp_dev *dev)
	295	{
88286450	296	struct ssp_device *ssp = dev->ssp;
88286450	297
3dcb00ea	298	ssp_disable(dev);
88286450	299	free_irq(dev->irq, dev);
	300	clk_disable(ssp->clk);
	301	ssp_free(ssp);
	302	}
	303
	304	static DEFINE_MUTEX(ssp_lock);
	305	static LIST_HEAD(ssp_list);
	306
	307	struct ssp_device ssp_request(int port, const char label)
	308	{
	309	struct ssp_device *ssp = NULL;
	310
	311	mutex_lock(&ssp_lock);
1da177e4	312
88286450	313	list_for_each_entry(ssp, &ssp_list, node) {
	314	if (ssp->port_id == port && ssp->use_count == 0) {
	315	ssp->use_count++;
	316	ssp->label = label;
	317	break;
	318	}
1da177e4 LT	319	}
1da177e4 LT	320
88286450	321	mutex_unlock(&ssp_lock);
	322
	323	if (ssp->port_id != port)
	324	return NULL;
	325
	326	return ssp;
	327	}
	328	EXPORT_SYMBOL(ssp_request);
	329
	330	void ssp_free(struct ssp_device *ssp)
	331	{
	332	mutex_lock(&ssp_lock);
	333	if (ssp->use_count) {
	334	ssp->use_count--;
	335	ssp->label = NULL;
	336	} else
	337	dev_err(&ssp->pdev->dev, "device already free\n");
	338	mutex_unlock(&ssp_lock);
1da177e4	339	}
88286450	340	EXPORT_SYMBOL(ssp_free);
	341
	342	static int __devinit ssp_probe(struct platform_device *pdev, int type)
	343	{
	344	struct resource *res;
	345	struct ssp_device *ssp;
	346	int ret = 0;
	347
	348	ssp = kzalloc(sizeof(struct ssp_device), GFP_KERNEL);
	349	if (ssp == NULL) {
	350	dev_err(&pdev->dev, "failed to allocate memory");
	351	return -ENOMEM;
	352	}
	353
	354	ssp->clk = clk_get(&pdev->dev, "SSPCLK");
	355	if (IS_ERR(ssp->clk)) {
	356	ret = PTR_ERR(ssp->clk);
	357	goto err_free;
	358	}
	359
	360	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
	361	if (res == NULL) {
	362	dev_err(&pdev->dev, "no memory resource defined\n");
	363	ret = -ENODEV;
	364	goto err_free_clk;
	365	}
	366
	367	res = request_mem_region(res->start, res->end - res->start + 1,
	368	pdev->name);
	369	if (res == NULL) {
	370	dev_err(&pdev->dev, "failed to request memory resource\n");
	371	ret = -EBUSY;
	372	goto err_free_clk;
	373	}
	374
	375	ssp->phys_base = res->start;
	376
	377	ssp->mmio_base = ioremap(res->start, res->end - res->start + 1);
	378	if (ssp->mmio_base == NULL) {
	379	dev_err(&pdev->dev, "failed to ioremap() registers\n");
	380	ret = -ENODEV;
	381	goto err_free_mem;
	382	}
	383
	384	ssp->irq = platform_get_irq(pdev, 0);
	385	if (ssp->irq < 0) {
	386	dev_err(&pdev->dev, "no IRQ resource defined\n");
	387	ret = -ENODEV;
	388	goto err_free_io;
	389	}
	390
	391	res = platform_get_resource(pdev, IORESOURCE_DMA, 0);
	392	if (res == NULL) {
	393	dev_err(&pdev->dev, "no SSP RX DRCMR defined\n");
	394	ret = -ENODEV;
	395	goto err_free_io;
	396	}
	397	ssp->drcmr_rx = res->start;
	398
	399	res = platform_get_resource(pdev, IORESOURCE_DMA, 1);
	400	if (res == NULL) {
	401	dev_err(&pdev->dev, "no SSP TX DRCMR defined\n");
	402	ret = -ENODEV;
	403	goto err_free_io;
404	}
405	ssp->drcmr_tx = res->start;
406
407	/* PXA2xx/3xx SSP ports starts from 1 and the internal pdev->id
408	* starts from 0, do a translation here
409	*/
410	ssp->port_id = pdev->id + 1;
411	ssp->use_count = 0;
412	ssp->type = type;
413
414	mutex_lock(&ssp_lock);
415	list_add(&ssp->node, &ssp_list);
416	mutex_unlock(&ssp_lock);
417
418	platform_set_drvdata(pdev, ssp);
419	return 0;
420
421	err_free_io:
422	iounmap(ssp->mmio_base);
423	err_free_mem:
424	release_mem_region(res->start, res->end - res->start + 1);
425	err_free_clk:
426	clk_put(ssp->clk);
427	err_free:
428	kfree(ssp);
429	return ret;
430	}
431
432	static int __devexit ssp_remove(struct platform_device *pdev)
433	{
434	struct resource *res;
435	struct ssp_device *ssp;
436
437	ssp = platform_get_drvdata(pdev);
438	if (ssp == NULL)
439	return -ENODEV;
440
441	iounmap(ssp->mmio_base);
442
443	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
444	release_mem_region(res->start, res->end - res->start + 1);
445
446	clk_put(ssp->clk);
447
448	mutex_lock(&ssp_lock);
449	list_del(&ssp->node);
450	mutex_unlock(&ssp_lock);
451
452	kfree(ssp);
453	return 0;
454	}
455
456	static int __devinit pxa25x_ssp_probe(struct platform_device *pdev)
457	{
458	return ssp_probe(pdev, PXA25x_SSP);
459	}
460
461	static int __devinit pxa25x_nssp_probe(struct platform_device *pdev)
462	{
463	return ssp_probe(pdev, PXA25x_NSSP);
464	}
465
466	static int __devinit pxa27x_ssp_probe(struct platform_device *pdev)
467	{
468	return ssp_probe(pdev, PXA27x_SSP);
469	}
470
471	static struct platform_driver pxa25x_ssp_driver = {
472	.driver = {
473	.name = "pxa25x-ssp",
474	},
475	.probe = pxa25x_ssp_probe,
476	.remove = __devexit_p(ssp_remove),
477	};
478
479	static struct platform_driver pxa25x_nssp_driver = {
480	.driver = {
481	.name = "pxa25x-nssp",
482	},
483	.probe = pxa25x_nssp_probe,
484	.remove = __devexit_p(ssp_remove),
485	};
486
487	static struct platform_driver pxa27x_ssp_driver = {
488	.driver = {
489	.name = "pxa27x-ssp",
490	},
491	.probe = pxa27x_ssp_probe,
492	.remove = __devexit_p(ssp_remove),
493	};
494
495	static int __init pxa_ssp_init(void)
496	{
497	int ret = 0;
498
499	ret = platform_driver_register(&pxa25x_ssp_driver);
500	if (ret) {
501	printk(KERN_ERR "failed to register pxa25x_ssp_driver");
502	return ret;
503	}
504
505	ret = platform_driver_register(&pxa25x_nssp_driver);
506	if (ret) {
507	printk(KERN_ERR "failed to register pxa25x_nssp_driver");
508	return ret;
509	}
510
511	ret = platform_driver_register(&pxa27x_ssp_driver);
512	if (ret) {
513	printk(KERN_ERR "failed to register pxa27x_ssp_driver");
514	return ret;
515	}
516
517	return ret;
518	}
519
520	static void __exit pxa_ssp_exit(void)
521	{
522	platform_driver_unregister(&pxa25x_ssp_driver);
523	platform_driver_unregister(&pxa25x_nssp_driver);
524	platform_driver_unregister(&pxa27x_ssp_driver);
525	}
526
cae05541	527	arch_initcall(pxa_ssp_init);
88286450	528	module_exit(pxa_ssp_exit);
1da177e4 LT	529
	530	EXPORT_SYMBOL(ssp_write_word);
	531	EXPORT_SYMBOL(ssp_read_word);
	532	EXPORT_SYMBOL(ssp_flush);
	533	EXPORT_SYMBOL(ssp_enable);
	534	EXPORT_SYMBOL(ssp_disable);
	535	EXPORT_SYMBOL(ssp_save_state);
	536	EXPORT_SYMBOL(ssp_restore_state);
	537	EXPORT_SYMBOL(ssp_init);
	538	EXPORT_SYMBOL(ssp_exit);
	539	EXPORT_SYMBOL(ssp_config);
	540
	541	MODULE_DESCRIPTION("PXA SSP driver");
	542	MODULE_AUTHOR("Liam Girdwood");
	543	MODULE_LICENSE("GPL");
	544