[linux-2.6-block.git] / drivers / spi / dw_spi_mmio.c

/*
 * dw_spi_mmio.c - Memory-mapped interface driver for DW SPI Core
 *
 * Copyright (c) 2010, Octasic semiconductor.
 *
 * This program is free software; you can redistribute it and/or modify it
 * under the terms and conditions of the GNU General Public License,
 * version 2, as published by the Free Software Foundation.
 */

#include <linux/clk.h>
#include <linux/err.h>
#include <linux/interrupt.h>
#include <linux/platform_device.h>
#include <linux/slab.h>
#include <linux/spi/dw_spi.h>
#include <linux/spi/spi.h>

#define DRIVER_NAME "dw_spi_mmio"

struct dw_spi_mmio {
	struct dw_spi  dws;
	struct clk     *clk;
};

static int __devinit dw_spi_mmio_probe(struct platform_device *pdev)
{
	struct dw_spi_mmio *dwsmmio;
	struct dw_spi *dws;
	struct resource *mem, *ioarea;
	int ret;

	dwsmmio = kzalloc(sizeof(struct dw_spi_mmio), GFP_KERNEL);
	if (!dwsmmio) {
		ret = -ENOMEM;
		goto err_end;
	}

	dws = &dwsmmio->dws;

	/* Get basic io resource and map it */
	mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
	if (!mem) {
		dev_err(&pdev->dev, "no mem resource?\n");
		ret = -EINVAL;
		goto err_kfree;
	}

	ioarea = request_mem_region(mem->start, resource_size(mem),
			pdev->name);
	if (!ioarea) {
		dev_err(&pdev->dev, "SPI region already claimed\n");
		ret = -EBUSY;
		goto err_kfree;
	}

	dws->regs = ioremap_nocache(mem->start, resource_size(mem));
	if (!dws->regs) {
		dev_err(&pdev->dev, "SPI region already mapped\n");
		ret = -ENOMEM;
		goto err_release_reg;
	}

	dws->irq = platform_get_irq(pdev, 0);
	if (dws->irq < 0) {
		dev_err(&pdev->dev, "no irq resource?\n");
		ret = dws->irq; /* -ENXIO */
		goto err_unmap;
	}

	dwsmmio->clk = clk_get(&pdev->dev, NULL);
	if (IS_ERR(dwsmmio->clk)) {
		ret = PTR_ERR(dwsmmio->clk);
		goto err_irq;
	}
	clk_enable(dwsmmio->clk);

	dws->parent_dev = &pdev->dev;
	dws->bus_num = 0;
	dws->num_cs = 4;
	dws->max_freq = clk_get_rate(dwsmmio->clk);

	ret = dw_spi_add_host(dws);
	if (ret)
		goto err_clk;

	platform_set_drvdata(pdev, dwsmmio);
	return 0;

err_clk:
	clk_disable(dwsmmio->clk);
	clk_put(dwsmmio->clk);
	dwsmmio->clk = NULL;
err_irq:
	free_irq(dws->irq, dws);
err_unmap:
	iounmap(dws->regs);
err_release_reg:
	release_mem_region(mem->start, resource_size(mem));
err_kfree:
	kfree(dwsmmio);
err_end:
	return ret;
}

static int __devexit dw_spi_mmio_remove(struct platform_device *pdev)
{
	struct dw_spi_mmio *dwsmmio = platform_get_drvdata(pdev);
	struct resource *mem;

	platform_set_drvdata(pdev, NULL);

	clk_disable(dwsmmio->clk);
	clk_put(dwsmmio->clk);
	dwsmmio->clk = NULL;

	free_irq(dwsmmio->dws.irq, &dwsmmio->dws);
	dw_spi_remove_host(&dwsmmio->dws);
	iounmap(dwsmmio->dws.regs);
	kfree(dwsmmio);

	mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
	release_mem_region(mem->start, resource_size(mem));
	return 0;
}

static struct platform_driver dw_spi_mmio_driver = {
	.remove		= __devexit_p(dw_spi_mmio_remove),
	.driver		= {
		.name	= DRIVER_NAME,
		.owner	= THIS_MODULE,
	},
};

static int __init dw_spi_mmio_init(void)
{
	return platform_driver_probe(&dw_spi_mmio_driver, dw_spi_mmio_probe);
}
module_init(dw_spi_mmio_init);

static void __exit dw_spi_mmio_exit(void)
{
	platform_driver_unregister(&dw_spi_mmio_driver);
}
module_exit(dw_spi_mmio_exit);

MODULE_AUTHOR("Jean-Hugues Deschenes <jean-hugues.deschenes@octasic.com>");
MODULE_DESCRIPTION("Memory-mapped I/O interface driver for DW SPI Core");
MODULE_LICENSE("GPL v2");
Commit	Line	Data
f7b6fd6d JHD	1	/*
	2	* dw_spi_mmio.c - Memory-mapped interface driver for DW SPI Core
	3	*
	4	* Copyright (c) 2010, Octasic semiconductor.
	5	*
	6	* This program is free software; you can redistribute it and/or modify it
	7	* under the terms and conditions of the GNU General Public License,
	8	* version 2, as published by the Free Software Foundation.
	9	*/
	10
	11	#include <linux/clk.h>
50c01fc3	12	#include <linux/err.h>
f7b6fd6d JHD	13	#include <linux/interrupt.h>
f7b6fd6d JHD	14	#include <linux/platform_device.h>
5a0e3ad6	15	#include <linux/slab.h>
f7b6fd6d JHD	16	#include <linux/spi/dw_spi.h>
	17	#include <linux/spi/spi.h>
	18
	19	#define DRIVER_NAME "dw_spi_mmio"
	20
	21	struct dw_spi_mmio {
0a4c1d7d JHD	22	struct dw_spi dws;
0a4c1d7d JHD	23	struct clk *clk;
f7b6fd6d JHD	24	};
	25
	26	static int __devinit dw_spi_mmio_probe(struct platform_device *pdev)
	27	{
	28	struct dw_spi_mmio *dwsmmio;
	29	struct dw_spi *dws;
	30	struct resource mem, ioarea;
	31	int ret;
	32
	33	dwsmmio = kzalloc(sizeof(struct dw_spi_mmio), GFP_KERNEL);
	34	if (!dwsmmio) {
	35	ret = -ENOMEM;
	36	goto err_end;
	37	}
	38
	39	dws = &dwsmmio->dws;
	40
	41	/* Get basic io resource and map it */
	42	mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
	43	if (!mem) {
	44	dev_err(&pdev->dev, "no mem resource?\n");
	45	ret = -EINVAL;
	46	goto err_kfree;
	47	}
	48
	49	ioarea = request_mem_region(mem->start, resource_size(mem),
	50	pdev->name);
	51	if (!ioarea) {
	52	dev_err(&pdev->dev, "SPI region already claimed\n");
	53	ret = -EBUSY;
	54	goto err_kfree;
	55	}
	56
	57	dws->regs = ioremap_nocache(mem->start, resource_size(mem));
	58	if (!dws->regs) {
	59	dev_err(&pdev->dev, "SPI region already mapped\n");
	60	ret = -ENOMEM;
	61	goto err_release_reg;
	62	}
	63
	64	dws->irq = platform_get_irq(pdev, 0);
	65	if (dws->irq < 0) {
	66	dev_err(&pdev->dev, "no irq resource?\n");
	67	ret = dws->irq; /* -ENXIO */
	68	goto err_unmap;
	69	}
	70
	71	dwsmmio->clk = clk_get(&pdev->dev, NULL);
50c01fc3 JI	72	if (IS_ERR(dwsmmio->clk)) {
50c01fc3 JI	73	ret = PTR_ERR(dwsmmio->clk);
f7b6fd6d JHD	74	goto err_irq;
	75	}
	76	clk_enable(dwsmmio->clk);
	77
	78	dws->parent_dev = &pdev->dev;
	79	dws->bus_num = 0;
	80	dws->num_cs = 4;
	81	dws->max_freq = clk_get_rate(dwsmmio->clk);
	82
	83	ret = dw_spi_add_host(dws);
	84	if (ret)
	85	goto err_clk;
	86
	87	platform_set_drvdata(pdev, dwsmmio);
	88	return 0;
	89
	90	err_clk:
	91	clk_disable(dwsmmio->clk);
	92	clk_put(dwsmmio->clk);
	93	dwsmmio->clk = NULL;
	94	err_irq:
	95	free_irq(dws->irq, dws);
	96	err_unmap:
	97	iounmap(dws->regs);
	98	err_release_reg:
	99	release_mem_region(mem->start, resource_size(mem));
	100	err_kfree:
	101	kfree(dwsmmio);
	102	err_end:
	103	return ret;
	104	}
	105
	106	static int __devexit dw_spi_mmio_remove(struct platform_device *pdev)
	107	{
	108	struct dw_spi_mmio *dwsmmio = platform_get_drvdata(pdev);
	109	struct resource *mem;
	110
	111	platform_set_drvdata(pdev, NULL);
	112
	113	clk_disable(dwsmmio->clk);
	114	clk_put(dwsmmio->clk);
	115	dwsmmio->clk = NULL;
	116
	117	free_irq(dwsmmio->dws.irq, &dwsmmio->dws);
	118	dw_spi_remove_host(&dwsmmio->dws);
	119	iounmap(dwsmmio->dws.regs);
	120	kfree(dwsmmio);
	121
	122	mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
	123	release_mem_region(mem->start, resource_size(mem));
	124	return 0;
	125	}
	126
	127	static struct platform_driver dw_spi_mmio_driver = {
	128	.remove = __devexit_p(dw_spi_mmio_remove),
	129	.driver = {
	130	.name = DRIVER_NAME,
	131	.owner = THIS_MODULE,
	132	},
	133	};
	134
	135	static int __init dw_spi_mmio_init(void)
	136	{
	137	return platform_driver_probe(&dw_spi_mmio_driver, dw_spi_mmio_probe);
138	}
0a4c1d7d	139	module_init(dw_spi_mmio_init);
f7b6fd6d JHD	140
	141	static void __exit dw_spi_mmio_exit(void)
	142	{
	143	platform_driver_unregister(&dw_spi_mmio_driver);
	144	}
f7b6fd6d JHD	145	module_exit(dw_spi_mmio_exit);
	146
	147	MODULE_AUTHOR("Jean-Hugues Deschenes <jean-hugues.deschenes@octasic.com>");
	148	MODULE_DESCRIPTION("Memory-mapped I/O interface driver for DW SPI Core");
	149	MODULE_LICENSE("GPL v2");