[deliverable/linux.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/interrupt.h>
#include <linux/platform_device.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 (!dwsmmio->clk) {
		ret = -ENODEV;
		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);
}

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

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